JP7357939B2 - Valve body assembly, stator unit, electric valve and air conditioner, and method for manufacturing valve body assembly and stator unit - Google Patents

Description

The present invention relates to a valve body assembly used in an electric valve, a stator unit used in the electric valve, an electric valve having a valve body assembly and a stator unit, and an air conditioner having an electric valve. The present invention also relates to a method of manufacturing a valve body assembly and a method of manufacturing a stator unit.

An electronic expansion valve, which is an example of a conventional electric valve, is described in Patent Document 1. Electronic expansion valves are incorporated into air conditioners. The electronic expansion valve includes a first refrigerant pipe, a second refrigerant pipe, a valve body, a valve body, and a stepping motor that moves the valve body according to the number of pulses. The valve body has a valve chamber connected to the first refrigerant pipe, and a valve port connecting the valve chamber and the second refrigerant pipe. The valve body has a valve portion inserted into the valve port and forms a variable throttle portion between the valve port and the valve portion. The electronic expansion valve uses the number of pulses of the stepping motor as the opening point when the amount of fluid flowing through the valve port is a predetermined set value. Electronic expansion valves are labeled with a bar code that includes a measurement of the valve opening point taken during the manufacturing process. The air conditioner uses the measured value of the valve opening point read from the barcode to control the electronic expansion valve.

Patent No. 5218694

The electronic expansion valve includes a valve body assembly and a stator unit. The valve body assembly includes a valve body, a conduit joined to the valve body, and a rotor for moving the valve body. The stator unit has a stator. A stepping motor is composed of a rotor and a stator. After the valve opening point is measured, the electronic expansion valve is once disassembled into the valve body assembly and the stator unit. During the manufacturing process of the air conditioner (eg, after the conduits of the valve body assembly are connected to other piping of the air conditioner), the valve body assembly and stator unit are recombined. At this time, the combination of the valve body assembly and stator unit incorporated into the air conditioner may be different from the combination of the valve body assembly and stator unit when the valve opening point was measured. As a result, in electronic expansion valves built into air conditioners, the measured value of the valve opening point read from the barcode does not match the actual valve opening point, making it impossible to accurately control the flow rate of refrigerant flowing through the electronic expansion valve. There was a risk.

Therefore, the present invention is applicable to a motor-operated valve that can accurately control the flow rate even when the combination of the valve body assembly and the stator unit is different from the combination when information related to flow control is measured. The present invention aims to provide a valve body assembly, a stator unit used in the electric valve, an air conditioner having the electric valve, and a method for manufacturing the valve body assembly and a stator unit.

In order to achieve the above object, a valve body assembly according to one aspect of the present invention includes:
A valve body assembly used in an electric valve, the valve body assembly comprising:
a valve body provided with a valve port;
a cylindrical rotor having a plurality of magnetic poles rotatably arranged with respect to the valve body;
a movable stopper fixed to the rotor and having a planar movable stopper surface along the radial direction ;
a fixed stopper that is fixed to the valve body and restricts the rotation of the rotor in the valve closing direction by abutting against the movable stopper surface ;
a valve body that changes the opening degree of the valve port according to the rotation of the rotor;
Rotor side correction information including information regarding a deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is attached to the outer surface of the valve body assembly. It is characterized by being
However, the rotor side deviation angle is between a first line extending in the radial direction passing through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and a first line extending in the radial direction passing through the central axis of the rotor and along the movable stopper surface. This is the angle formed by the extended line, and the shift angle toward the rotor when the first line and the extended line overlap is 0.

In the present invention,
The rotor constitutes a stepping motor together with a stator of a stator unit,
The information related to the rotor side deviation angle is information indicating the number of pulses (hereinafter referred to as "rotor side correction pulse number Kr") necessary for rotating the rotor by the rotor side deviation angle in the stepping motor. ,
The rotor side correction pulse number Kr is a relative increase/decrease number with respect to the pulse number used for the valve body assembly in which the rotor side deviation angle is 0,
When the number of pulses included in the pulse train input to the stepping motor when rotating the rotor in the valve opening direction is N, it is preferable that the following formula (1) is satisfied.
-((N/2)-1)≦Kr≦N/2... (1)
However, Kr is an integer, and N is an even natural number.

In order to achieve the above object, a stator unit according to another aspect of the present invention,
A stator unit used in an electric valve,
a cylindrical stator having a plurality of pole teeth;
a positioning member for positioning the stator relative to the valve body assembly;
Stator side correction information including information regarding a deviation angle between the pole teeth of the stator and the positioning member around the central axis of the stator (hereinafter referred to as "stator side deviation angle") is attached to the outer surface of the stator unit. It is characterized by being
However, the stator side deviation angle is between a second line extending in the radial direction passing through the central axis of the stator and the center of the reference pole tooth of the stator, and a second line extending in the radial direction passing through the central axis of the stator and the center of the positioning member. This is an angle formed by the extending center line, and the stator side shift angle is 0 when the second line and the center line overlap.

In the present invention,
the stator, together with the rotor of the valve body assembly, forms a stepper motor;
The information related to the stator side deviation angle is information indicating the number of pulses (hereinafter referred to as "stator side correction pulse number Ks") necessary for rotating the rotor by the stator side deviation angle in the stepping motor. ,
The stator side correction pulse number Ks is a relative increase/decrease with respect to the pulse number used for the stator unit in which the stator side deviation angle is 0,
When the number of pulses included in the pulse train input to the stepping motor when rotating the rotor in the valve opening direction is N, it is preferable that the following formula (2) is satisfied.
-((N/2)-1)≦Ks≦N/2... (2)
However, Ks is an integer, and N is an even natural number.

In order to achieve the above object, an electric valve according to another aspect of the present invention,
A motor-operated valve having a valve body assembly and a stator unit, the motor-operated valve comprising:
The valve body assembly includes a valve body having a valve port, a cylindrical rotor having a plurality of magnetic poles rotatably disposed with respect to the valve body, and a radially fixed rotor with respect to the rotor. a movable stopper having a planar movable stopper surface along the valve body ; a fixed stopper that is fixed to the valve body and restricts rotation of the rotor in the valve closing direction when the movable stopper surface abuts; and rotation of the rotor. a valve body that changes the opening degree of the valve port according to the
The stator unit has a cylindrical stator having a plurality of pole teeth, and a positioning member for positioning the stator with respect to the valve body assembly,
The rotor and the stator are coaxially arranged and constitute a stepping motor,
Rotor side correction information including information regarding a deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is attached to the outer surface of the valve body assembly. has been
Stator side correction information including information regarding a deviation angle between the pole teeth of the stator and the positioning member around the central axis of the stator (hereinafter referred to as "stator side deviation angle") is attached to the outer surface of the stator unit. It is characterized by being
however,
The rotor side deviation angle includes a first line extending in the radial direction through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and an extension extending in the radial direction through the central axis of the rotor and along the movable stopper surface. line, and the rotor side deviation angle when the first line and the extension line overlap is 0,
The stator side deviation angle includes a second line extending radially through the central axis of the stator and the center of the reference pole teeth of the stator, and a center extending radially through the central axis of the stator and the center of the positioning member. The stator side deviation angle is 0 when the second line and the center line overlap.

In the present invention,
The information related to the rotor side deviation angle is information indicating the number of pulses (hereinafter referred to as "rotor side correction pulse number Kr") necessary for rotating the rotor by the rotor side deviation angle in the stepping motor. ,
The rotor side correction pulse number Kr is a relative increase/decrease number with respect to the pulse number used for the valve body assembly in which the rotor side deviation angle is 0,
The information related to the stator side deviation angle is information indicating the number of pulses (hereinafter referred to as "stator side correction pulse number Ks") necessary for rotating the rotor by the stator side deviation angle in the stepping motor. ,
The stator side correction pulse number Ks is a relative increase/decrease with respect to the pulse number used for the stator unit in which the stator side deviation angle is 0,
When the number of pulses included in the pulse train input to the stepping motor when rotating the rotor in the valve opening direction is N, it is preferable that the following equations (1) and (2) are satisfied.
-((N/2)-1)≦Kr≦N/2... (1)
-((N/2)-1)≦Ks≦N/2... (2)
However, Kr and Ks are integers, and N is an even natural number.

In order to achieve the above object, an air conditioner according to another aspect of the present invention includes:
An air conditioner having the above electric valve,
The electric valve is configured to be controlled based on the rotor side correction information and the stator side correction information.

In order to achieve the above object, an air conditioner according to another aspect of the present invention includes:
An air conditioner having the above electric valve,
The electric valve is configured to be controlled based on the number of pulses (hereinafter referred to as "corrected pulse number K") calculated using the following equations (3a), (3b), and (3c). .
K=Kr+Ks... (3a)
However, -((N/2)-1)≦Kr+Ks≦N/2
K=Kr+Ks-N... (3b)
However, Kr+Ks>N/2
K=Kr+Ks+N... (3c)
However, -((N/2)-1)>Kr+Ks

In order to achieve the above object, a method for manufacturing a valve body assembly according to another aspect of the present invention includes:
A method of manufacturing a valve body assembly used in an electric valve, the method comprising:
A valve body provided with a valve port, a cylindrical rotor having a plurality of magnetic poles rotatably arranged with respect to the valve body, and a planar movable member fixed to the rotor and movable along a radial direction. a movable stopper having a stopper surface ; a fixed stopper that is fixed to the valve body and restricts the rotation of the rotor in the valve closing direction when the movable stopper abuts against the movable stopper; A valve body assembly having no rotor side correction information, which has a valve body that changes the opening degree,
a cylindrical stator having a plurality of pole teeth; and a positioning member for positioning the stator with respect to the valve body assembly, the center of the stator between the pole teeth of the stator and the positioning member. Prepare a reference stator unit whose deviation angle around the axis (hereinafter referred to as "stator side deviation angle") is 0,
A stepping motor is configured by combining the valve body assembly without rotor side correction information and the reference stator unit, and arranging the rotor and the stator coaxially ,
A pulse train that is input to the stepping motor when rotating the rotor in the valve opening direction (however, the pulse train includes N pulses assigned orders from [0] to [N-1]) in reverse order. input to the stepping motor one or more times to rotate the rotor in the valve closing direction until the movable stopper surface abuts the fixed stopper,
After the movable stopper surface hits the fixed stopper, when pulse number [0] is input, the input of the pulse train in the reverse order is stopped, and the pulse train is sent to the stepping motor in the forward order starting from pulse number [0]. The number of pulses input (hereinafter referred to as (referred to as the "rotor side valve opening pulse number"),
Based on the number of differences between the number of rotor-side valve opening pulses and the reference valve-opening pulse number , the deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is determined. ) generates the rotor side correction information including information related to
The rotor side correction information including the information related to the rotor side deviation angle is attached to the outer surface of the valve body assembly which does not have the rotor side correction information.
However, the number of reference valve opening pulses is the same as the number of valve opening pulses on the rotor side obtained in a reference electric valve that combines the reference valve body assembly and the reference stator unit in which the rotor side deviation angle is 0. ,
The rotor side deviation angle includes a first line extending in the radial direction through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and an extension extending in the radial direction through the central axis of the rotor and along the movable stopper surface. line, and the rotor side deviation angle when the first line and the extension line overlap is 0,
The stator side deviation angle includes a second line extending radially through the central axis of the stator and the center of the reference pole teeth of the stator, and a center extending radially through the central axis of the stator and the center of the positioning member. The stator side deviation angle is 0 when the second line and the center line overlap.

In order to achieve the above object, a method for manufacturing a stator unit according to another aspect of the present invention includes:
A method for manufacturing a stator unit used in an electric valve, the method comprising:
Producing a stator unit without stator side correction information, the stator unit having a cylindrical stator having a plurality of pole teeth and a positioning member for positioning the stator with respect to the valve body assembly,
A valve body provided with a valve port, a cylindrical rotor having a plurality of magnetic poles rotatably arranged with respect to the valve body, and a planar movable member fixed to the rotor and movable along a radial direction. a movable stopper having a stopper surface ; a fixed stopper that is fixed to the valve body and restricts rotation of the rotor in the valve closing direction when the movable stopper surface abuts against the valve body; a valve body that changes the opening degree of the rotor, and a standard in which a deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is 0. Prepare the valve body assembly,
A stepping motor is configured by combining the stator unit without stator side correction information and the reference valve body assembly, and arranging the rotor and the stator coaxially ,
A pulse train that is input to the stepping motor when rotating the rotor in the valve opening direction (however, the pulse train includes N pulses assigned orders from [0] to [N-1]) in reverse order. input to the stepping motor one or more times to rotate the rotor in the valve closing direction until the movable stopper surface abuts the fixed stopper,
After the movable stopper surface hits the fixed stopper, when pulse number [0] is input, the input of the pulse train in the reverse order is stopped, and the pulse train is sent to the stepping motor in the forward order starting from pulse number [0]. The number of pulses input (hereinafter referred to as (referred to as the "stator side valve opening pulse number"),
Based on the number of differences between the stator side valve opening pulse number and the reference valve opening pulse number , the deviation angle of the stator pole teeth and the positioning member around the central axis of the stator (hereinafter referred to as "stator side deviation angle") ) generates the stator side correction information including information related to
The stator side correction information including the information related to the stator side deviation angle is attached to an outer surface of the stator unit that does not have the stator side correction information.
However, the number of reference valve opening pulses is the same as the number of valve opening pulses on the stator side obtained in a reference electric valve that combines the reference valve main body assembly and the reference stator unit in which the stator side deviation angle is 0. ,
The rotor side deviation angle includes a first line extending in the radial direction through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and an extension extending in the radial direction through the central axis of the rotor and along the movable stopper surface. line, and the rotor side deviation angle when the first line and the extension line overlap is 0,
The stator side deviation angle includes a second line extending radially through the central axis of the stator and the center of the reference pole teeth of the stator, and a center extending radially through the central axis of the stator and the center of the positioning member. The stator side deviation angle is 0 when the second line and the center line overlap.

According to the present invention, rotor-side correction information including information regarding the deviation angle between the magnetic poles of the rotor and the movable stopper (rotor-side deviation angle) is attached to the outer surface of the valve body assembly. Stator side correction information including information regarding the deviation angle between the pole teeth of the stator and the positioning member (stator side deviation angle) is attached to the outer surface of the stator unit. Because of this, when a motorized valve is constructed by combining the valve body assembly and the stator unit, the motorized valve can be opened based on the rotor-side correction information and stator-side correction information attached to the respective outer surfaces. The position related to the valve can be accurately grasped. Therefore, the flow rate of refrigerant flowing through the electric valve can be accurately controlled.

FIG. 1 is a front view of an electric valve according to an embodiment of the present invention. FIG. 2 is a front view of a valve body assembly included in the electric valve of FIG. 1; 3 is a cross-sectional view of the valve body assembly of FIG. 2; FIG. FIG. 3 is a side view of a guide bush included in the valve body assembly of FIG. 2; 3 is a diagram showing a stopper member included in the valve body assembly of FIG. 2. FIG. 3 is a diagram showing a valve stem holder included in the valve body assembly of FIG. 2. FIG. FIG. 3 is a plan view of the valve stem holder and rotor included in the valve body assembly of FIG. 2 (rotor side deviation angle α=0). FIG. 3 is a plan view of the valve stem holder and rotor of the valve body assembly of FIG. 2 (rotor side deviation angle α≠0). FIG. 2 is a sectional view of a stator unit included in the electric valve of FIG. 1. FIG. It is a figure which shows the positioning member which the stator unit of FIG. 9 has. 10 is a diagram schematically showing the positional relationship between the pole teeth of the stator and the positioning member of the stator unit of FIG. 9 (stator side deviation angle β=0). FIG. 10 is a diagram schematically showing the positional relationship between the pole teeth of the stator and the positioning member of the stator unit of FIG. 9 (stator side deviation angle β≠0). FIG. FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[0] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[1] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[2] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[3] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[4] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[5] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[6] is input). FIG. 2 is a diagram schematically showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1 (when pulse P[7] is input). FIG. 3 is a sectional view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing how the valve body, guide bush, and stopper member are assembled). FIG. 3 is a cross-sectional view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing how the valve stem, valve body, valve closing spring, and washer are further assembled). FIG. 3 is a cross-sectional view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing how the valve stem holder, rotor, and fixture are further assembled). FIG. 3 is a cross-sectional view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing a state in which a movable stopper abuts against a fixed stopper). 25 is a plan view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing the state of FIG. 24); FIG. FIG. 3 is a sectional view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing a state in which the rotor is rotated 180 degrees in the valve opening direction from a state in which the movable stopper abuts against the fixed stopper). FIG. 27 is a plan view illustrating a method of manufacturing the valve body assembly of FIG. 2 (showing the state of FIG. 26). 2 is a table showing the correspondence between the positional relationship between the magnetic pole of the rotor and the movable stopper and the number of rotor-side correction pulses in the originating state of the electric valve of FIG. 1; 2 is a table showing the correspondence between the positional relationship between the pole teeth of the stator and the fixed stopper and the number of stator-side correction pulses in the originating state of the electric valve of FIG. 1. FIG. FIG. 2 is a schematic configuration diagram of an air conditioner having the electric valve of FIG. 1. FIG. 30 is a table showing the number of correction pulses of the electric valve based on the number of correction pulses on the rotor side of FIG. 28 and the number of correction pulses on the stator side of FIG. 29. FIG. FIG. 2 is a diagram showing the valve opening operation from the originating state in the electric valve of FIG. 1 (correction pulse number K=0). FIG. 2 is a diagram showing the valve opening operation from the originating state in the motor-operated valve of FIG. 1 (number of correction pulses K=1). FIG. 2 is a diagram showing the valve opening operation from the originating state in the electric valve of FIG. 1 (number of correction pulses K=2). FIG. 2 is a diagram showing the valve opening operation from the originating state in the motor-operated valve of FIG. 1 (number of correction pulses K=3). FIG. 2 is a diagram showing the valve opening operation from the originating state in the motor-operated valve of FIG. 1 (corrected pulse number K=4). FIG. 2 is a diagram showing the valve opening operation from the originating state in the electric valve of FIG. 1 (correction pulse number K=-3). FIG. 2 is a diagram showing the valve opening operation from the originating state in the motor-operated valve of FIG. 1 (corrected pulse number K=-2). FIG. 2 is a diagram showing a valve opening operation from a home positioning state in the electric valve of FIG. 1 (corrected pulse number K=-1).

The configuration of an electric valve according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 12. The motor-operated valve 1 of this embodiment is used, for example, to adjust the flow rate of refrigerant in a refrigeration cycle of an air conditioner.

FIG. 1 is a front view of an electric valve according to an embodiment of the present invention. FIG. 2 is a front view of a valve body assembly included in the electric valve of FIG. 1. FIG. 3 is a cross-sectional view of the valve body assembly of FIG. 2; 4 is a side view of a guide bush included in the valve body assembly of FIG. 2. FIG. 5 is a diagram showing a stopper member included in the valve body assembly of FIG. 2. FIG. FIG. 5(a) is a perspective view of the stopper member. FIG. 5(b) is a plan view of the stopper member. FIG. 6 is a diagram showing a valve stem holder included in the valve body assembly of FIG. 2. FIG. 6(a) is a perspective view of the valve stem holder. FIG. 6(b) is a plan view of the valve stem holder. 7 and 8 are plan views of the valve stem holder and rotor included in the valve body assembly of FIG. 2. FIG. FIG. 7 shows a case where the rotor side deviation angle α is 0. FIG. 8 shows a case where the rotor side deviation angle α is not zero. FIG. 9 is a sectional view of a stator unit included in the electric valve of FIG. 1. FIG. 10 is a diagram showing a positioning member included in the stator unit of FIG. 9. FIG. FIG. 10(a) is a perspective view of the positioning member. FIG. 10(b) is a side view of the positioning member. 11 and 12 are diagrams schematically showing the positional relationship between the pole teeth of the stator and the positioning member that the stator unit of FIG. 9 has. FIG. 11 shows a case where the stator side deviation angle β is 0. FIG. 12 shows a case where the stator side deviation angle β is not zero.

FIG. 1 shows an electric valve 1 of this embodiment. The electric valve 1 includes a valve body assembly 5 and a stator unit 6.

The valve body assembly 5 is shown in FIGS. 2 and 3. The valve body assembly 5 includes a valve body 10, a can 20, a valve stem 30, a valve body 40, a guide bush 50, a stopper member 60, a valve stem holder 70, and a rotor 80. . A valve body assembly label 18 is affixed to the outer surface of the valve body assembly 5.

The valve body 10 has a cylindrical shape. The valve body 10 is provided with a valve chamber 11 . A conduit 12 extending to the left and a conduit 13 extending downward are attached to the valve body 10. Conduit 12 is connected to valve chamber 11 . The conduit 13 is connected to the valve chamber 11 via a valve port 14 . The valve body 10 is provided with a valve seat 15 arranged to surround the valve port 14. Further, the valve body 10 is provided with a fitting hole 16. The inner peripheral surface of the fitting hole 16 has a positioning plane 16a facing left. The axis L passing through the axis of the valve body 10 and the axis M passing through the axis of the conduit 12 intersect at right angles.

A valve body assembly label 18 is affixed to the outer surface of the valve body 10. Rotor side correction information Jr is printed on the valve body assembly label 18. The rotor side correction information Jr will be described later. Note that the rotor-side correction information Jr may be directly printed on the outer peripheral surface of the valve body 10 or may be engraved with a laser. Note that the valve body assembly label 18 may be attached to the outer surface of the can 20.

The can 20 has a cylindrical shape with a closed upper end. The can 20 is joined to the upper end of the valve body 10 via a ring member 21.

The valve stem 30 has an elongated cylindrical shape. A valve body 40 is integrally provided at the lower end of the valve shaft 30.

The valve body 40 has a substantially conical shape whose diameter decreases from the top to the bottom. The tip of the valve body 40 is inserted into the valve port 14. A variable throttle portion is formed between the valve body 40 and the valve port 14. The valve body 40 contacts the valve seat 15 in the closed state. Note that the motor-operated valve 1 may have a configuration in which the valve body 40 does not contact the valve seat 15 when the opening degree of the valve port 14 is the minimum (valve-less configuration).

The guide bush 50 is shown in FIG. The guide bush 50 has a substantially cylindrical shape. A fitting part 51 is provided at the lower part of the guide bush 50. The fitting portion 51 has a D-cut plane 51a formed by cutting a part of the outer peripheral surface into a planar shape. The fitting portion 51 is press-fitted into the fitting hole 16 of the valve body 10. By aligning the D-cut plane 51a and the positioning plane 16a of the fitting hole 16, the axis of the valve body 10 and the axis of the guide bush 50 are aligned on the axis L, and the position around the axis L is aligned with the valve body 10. The guide bush 50 is correctly positioned. The guide bush 50 is arranged so that the axis M passes through the center of the D-cut plane 51a in the width direction (left-right direction in FIG. 4) when viewed from the direction of the axis L. The valve shaft 30 is inserted into the guide bush 50. The guide bush 50 supports the valve shaft 30 so as to be movable in the direction of the axis L. In addition, in the electric valve 1, if the deviation of the guide bush 50 around the axis L is suppressed to less than a predetermined value (for example, less than ±1 pulse), the D-cut plane 51a and the positioning plane 16a of the fitting hole 16 can be Not required. For example, the fitting part 51 is made into a cylindrical shape without a D-cut plane 51a, the fitting hole 16 is made into a cylindrical shape without a positioning plane 16a, and the cutting start position (lower end position, upper end position) of the male thread 53 (described later) is aligned with the axis. A configuration may be adopted in which alignment is performed using a reference position (mark) around L.

A male thread 53 is provided on the outer peripheral surface of the guide bush 50 above the fitting portion 51 . The male thread 53 is formed such that a hypothetical lower end position 53a obtained by extending the male thread 53 to the upper end of the fitting portion 51 coincides with the widthwise center of the D-cut plane 51a.

The stopper member 60 is shown in FIGS. 5(a) and 5(b). The stopper member 60 integrally includes a stopper main body 61 and a fixed stopper 64. The stopper body 61 has a cylindrical shape. A female thread 63 is provided on the inner peripheral surface of the stopper body 61. The fixed stopper 64 projects radially outward from the stopper body 61. The fixed stopper 64 has a fixed stopper surface 65. The fixed stopper surface 65 is formed in a planar shape along the radial direction of the stopper main body 61. As shown in FIG. 5(b), the fixed stopper surface 65 is formed to face counterclockwise around the axis L when viewed from above. The female thread 63 is formed such that a virtual lower end position 63a, which is obtained by extending the female thread 63 to the lower end of the stopper body 61, is located on one plane that includes the fixed stopper surface 65.

The stopper member 60 is fixed to the guide bush 50 by screwing the female thread 63 into the male thread 53 until the stopper main body 61 contacts the fitting portion 51 of the guide bush 50 . Thereby, the fixed stopper 64 is fixed to the valve body 10. When the stopper member 60 is fixed to the guide bush 50, the virtual lower end position 53a of the male thread 53 and the virtual lower end position 63a of the female thread 63 match. Therefore, the fixed stopper surface 65 is positioned at the center of the D-cut plane 51a in the width direction, and when viewed from the axis L direction, the fixed stopper surface 65 and the axis M coincide with each other with high accuracy. Note that in the electric valve 1, the fixed stopper surface 65 and the axis M may be deviated from each other due to design.

The valve stem holder 70 is shown in FIGS. 6(a) and 6(b). The valve stem holder 70 has a cylindrical shape with a closed upper end. The valve stem holder 70 integrally includes a peripheral wall portion 71, an upper wall portion 72, and a movable stopper 74. The peripheral wall portion 71 has a cylindrical shape. The peripheral wall portion 71 is provided with three convex portions 71a that protrude outward in the radial direction. The three convex portions 71a are arranged at equal intervals (120 degree intervals) in the circumferential direction. A female thread 73 is provided on the inner peripheral surface of the peripheral wall portion 71 . The female thread 73 is screwed into the male thread 53 of the guide bush 50. The upper wall portion 72 is connected to the upper end of the peripheral wall portion 71. A valve shaft insertion hole 72a is provided in the center of the upper wall portion 72. The movable stopper 74 projects radially outward from near the lower end of the peripheral wall portion 71 . The movable stopper 74 is provided with a movable stopper surface 75. The movable stopper surface 75 is formed in a planar shape along the radial direction of the peripheral wall portion 71. As shown in FIG. 6(b), the movable stopper surface 75 is formed to face clockwise around the axis L when viewed from above.

The upper end portion 31 of the valve stem 30 is inserted into the valve stem insertion hole 72a of the valve stem holder 70 so as to be movable in the axis L direction. A fixture 35 is attached to the upper end 31 of the valve shaft 30. The fixture 35 integrally includes a fixing portion 36 and a flange portion 37. The fixing portion 36 has a stepped cylindrical shape. The upper end portion 31 of the valve shaft 30 is inserted into the fixed portion 36 . The fixing part 36 is welded to the upper end part 31. The flange portion 37 is connected to the lower end of the fixed portion 36. A return spring 38 is arranged on the outside of the fixture 35. A washer 76 is disposed on the lower surface of the upper wall portion 72 of the valve stem holder 70, and a valve closing spring 77 is disposed between the washer 76 and the spring receiving portion 32 of the valve stem 30. The valve closing spring 77 is a compression coil spring and pushes the valve shaft 30 downward.

FIG. 7 shows the rotor 80 combined with the valve stem holder 70. The rotor 80 has a cylindrical shape. Rotor 80 has multiple magnetic poles. In this embodiment, the rotor 80 has 12 north poles and 12 south poles. The north poles and the south poles are arranged alternately in the circumferential direction. A mounting hole 81 is provided inside the rotor 80. The mounting hole 81 is provided with three recesses 81a corresponding to the three projections 71a of the valve stem holder 70. The valve stem holder 70 is fitted into the mounting hole 81 . The valve stem holder 70 and the rotor 80 are assembled coaxially with each other.

As shown in FIG. 7, when the deviation angle between the magnetic poles of the rotor 80 and the movable stopper 74 around the axis (referred to as "rotor side deviation angle α") is 0, the An extension line F passes through the center of the reference magnetic pole 85 of the rotor 80. In the drawing, the reference magnetic pole 85 is marked with a black circle. The valve body assembly 5 prepared for manufacturing the stator unit 6 and having a rotor side deviation angle α of 0 is referred to as a “standard valve body assembly 5S”. Note that depending on the dimensional accuracy or assembly accuracy of the parts, the magnetic poles of the rotor 80 and the movable stopper 74 may be misaligned around the axis (α≠0). FIG. 8 shows an example of a valve shaft holder 70 and a rotor 80 in which the rotor side deviation angle α is not 0.

FIG. 9 shows the stator unit 6. The stator unit 6 includes a stator 90, a cover 100, and a positioning member 110. A stator unit label 118 is attached to the outer surface of the stator unit 6 (FIG. 1).

Stator 90 has a cylindrical shape. The stator 90 and rotor 80 constitute a stepping motor. Stator 90 includes an A-phase stator 91 and a B-phase stator 96.

A-phase stator 91 has a yoke 92. A coil wire forming a coil 93 is wound around the yoke 92 . The yoke 92 has a plurality of downwardly facing pole teeth 92a and a plurality of upwardly facing pole teeth 92b, which are claw pole type pole teeth. The downward pole tooth 92a has a tapered tip facing downward. The upwardly facing pole tooth 92b has an upwardly tapered tip. In this embodiment, the yoke 92 has 12 downward facing pole teeth 92a and 12 upward facing pole teeth 92b. The downward pole teeth 92a and the upward pole teeth 92b are arranged alternately in the circumferential direction.

B-phase stator 96 has a similar configuration to A-phase stator 91. B-phase stator 96 has a yoke 97. A coil wire forming a coil 98 is wound around the yoke 97 . The yoke 97 has a plurality of downwardly facing pole teeth 97a and a plurality of upwardly facing pole teeth 97b, which are claw pole type pole teeth. The downward pole tooth 97a has a tapered tip facing downward. The upwardly facing pole tooth 97b has an upwardly tapered tip. In this embodiment, the yoke 97 has 12 downward pole teeth 97a and 12 upward pole teeth 97b. The downward pole teeth 97a and the upward pole teeth 97b are arranged alternately in the circumferential direction.

The A-phase stator 91 and the B-phase stator 96 are arranged on top of each other in the axis L direction so as to be coaxial with each other. The B-phase stator 96 is disposed offset from the A-phase stator 91 around the axis L by half the angle between the downwardly directed pole teeth 97a and the upwardly directed pole teeth 97b. The electric valve 1 of this embodiment is configured such that the rotor 80 rotates 360 degrees when 96 pulses are input to the A-phase stator 91 and the B-phase stator 96. The rotor 80 rotates 3.75 degrees per pulse.

The cover 100 is made of synthetic resin. The cover 100 has a cap shape. A stator 90 is arranged inside the cover 100. The cover 100 constitutes the inner circumferential surface 6a of the stator unit 6 together with each pole tooth of the A-phase stator 91 and each pole tooth of the B-phase stator 96. The diameter of the inner peripheral surface 6a of the stator unit 6 is the same as the outer diameter of the can 20. A can 20 is inserted inside the inner peripheral surface 6a of the stator unit 6. The stator unit 6 is arranged outside the can 20. Each pole tooth of the A-phase stator 91 and each pole tooth of the B-phase stator 96 are arranged to face each magnetic pole of the rotor 80 in the radial direction via the can 20. The cover 100 has a cover main body part 101 and a connector cover part 102. A connector 103 is arranged inside the connector cover part 102.

A stator unit label 118 is attached to the outer surface of the cover 100. Stator side correction information Js is printed on the stator unit label 118. The stator side correction information Js will be described later. Note that the stator side correction information Js may be directly printed on the outer surface of the cover 100 or may be engraved with a laser.

FIG. 10 shows the positioning member 110. The positioning member 110 integrally includes a flat plate portion 111 and arm portions 112, 112. The flat plate portion 111 has a rectangular plate shape. The flat plate portion 111 is fixed to the lower end of the cover 100. The arm portions 112, 112 have a corrugated plate shape. The arm portions 112, 112 extend downward from opposite sides in the width direction (left-right direction in FIG. 10(b)) of the flat plate portion 111. The arm parts 112, 112 have circular arc-shaped clamping parts 112a, 112a. The arm parts 112, 112 can be elastically deformed in the width direction of the flat plate part 111, and the holding parts 112a, 112a hold the conduit 12 therebetween. The positioning member 110 is configured such that, when viewed from the direction of the axis L, the center line G in the width direction of the flat plate portion 111 and the axis M coincide with each other with high precision.

As shown in FIG. 11, when the deviation angle around the axis between the pole teeth of the stator 90 and the positioning member 110 (referred to as "stator side deviation angle β") is 0, the center line of the flat plate portion 111 of the positioning member 110 G passes through the center of the reference pole tooth 95. In the drawing, the reference pole tooth 95 is marked with a black circle. The stator unit 6 prepared for manufacturing the valve body assembly 5 and having a stator side deviation angle β of 0 is referred to as a "standard stator unit 6S". Note that depending on the dimensional accuracy or assembly accuracy of the parts, the pole teeth of the stator 90 and the positioning member 110 may be misaligned around the axis (β≠0). FIG. 12 shows an example of a stator 90 and a positioning member 110 in which the stator side deviation angle β is not 0.

The can 20 of the valve body assembly 5 is fitted inside the stator unit 6. The conduit 12 of the valve body assembly 5 is held by the clamping parts 112a, 112a of the arm parts 112, 112 of the positioning member 110 of the stator unit 6. Thereby, the valve body assembly 5 and the stator unit 6 are combined with each other to form the electric valve 1. In the electric valve 1, when viewed from the direction of the axis L, the center line G of the fixed stopper surface 65 and the positioning member 110 coincides with the axis M with high precision. Therefore, the stator side deviation angle β can be regarded as the deviation angle between the pole teeth of the stator 90 and the fixed stopper 64.

Further, in the electric valve 1, the valve body 10, the can 20, the valve stem 30, the valve body 40, the guide bush 50, the stopper member 60 (stopper body 61), the valve stem holder 70 (peripheral wall part 71), the rotor 80, the stator 90 (The A-phase stator 91 and the B-phase stator 96) are arranged so that their respective central axes coincide with the axis L.

Next, an example of the operation of the electric valve 1 will be described with reference to FIGS. 13 to 20.

13 to 20 are diagrams showing the positional relationship between the magnetic poles of the rotor and the pole teeth of the stator and the pulses input to the stator during operation of the electric valve of FIG. 1. FIG. 13 to 20 show states in which pulses P[0] to P[7] are input to the stator.

In the electric valve 1, a pulse train S composed of N pulses is input to an A-phase stator 91 and a B-phase stator 96 of a stator 90 constituting a stepping motor. In this embodiment, N=8, and the pulse train S includes eight pulses P assigned the order of [0] to [7]. One pulse P includes a signal input to the A-phase stator 91 and a signal input to the B-phase stator 96.

In the motor-operated valve 1, when the pulse train S is input to the stator 90 in the order of pulses P[0] to P[7] (normal order), the rotor 80 rotates in the valve opening direction. When the pulse P[7] is input, the pulse returns to the pulse P[0], and the pulses P[0] to P[7] are input again in the order. That is, when the motor-operated valve 1 opens, the pulse train S is repeatedly input in the normal order. FIGS. 13 to 20 schematically show how the rotor 80 rotates in the valve opening direction when pulses P[0] to P[7] are input in the normal order to the A-phase stator 91 and the B-phase stator 96. .

When the rotor 80 rotates in the valve closing direction, the valve stem holder 70 also rotates. The valve stem holder 70 moves upward due to the screw feeding action of the female thread 73 of the valve stem holder 70 and the male thread 53 of the guide bush 50. The fixture 35 is pushed upward by the upper wall portion 72 of the valve stem holder 70. This causes the valve stem 30 and the valve body 40 to move upward. In this manner, the valve body 40 moves away from the valve seat 15 in accordance with the rotation of the rotor 80 in the valve opening direction, and the opening degree of the valve port 14 is adjusted.

Alternatively, in the electric valve 1, when the pulse train S is input to the stator 90 in the order of pulses P[7] to P[0] (in reverse order), the rotor 80 rotates in the valve closing direction. When the pulse P[0] is input, the pulse returns to the pulse P[7], and the pulses P[7] to P[0] are input again in the order. That is, when the motor-operated valve 1 closes, the pulse train S is repeatedly input in reverse order.

When the rotor 80 rotates in the valve closing direction, the valve stem holder 70 also rotates. The valve stem holder 70 moves downward due to the screw feeding action of the female thread 73 of the valve stem holder 70 and the male thread 53 of the guide bush 50. The valve stem 30 is pushed downward by a valve closing spring 77 supported by the upper wall portion 72 of the valve stem holder 70 via a washer 76 . As a result, the valve stem 30 and the valve body 40 move downward, and the valve body 40 comes into contact with the valve seat 15. In this way, as the rotor 80 rotates in the valve closing direction, the valve body 40 comes into contact with the valve seat 15, and the valve port 14 closes.

After the valve body 40 contacts the valve seat 15, when the pulse train S is further input to the stator 90 in the reverse order, the rotor 80 further rotates in the valve closing direction. At this time, since the valve body 40 is in contact with the valve seat 15, the valve stem 30 and the valve body 40 do not move downward, and the valve stem holder 70 moves further downward while compressing the valve closing spring 77. Then, the movable stopper surface 75 abuts against the fixed stopper surface 65, and rotation of the valve stem holder 70 and the rotor 80 is restricted. This stops the valve stem holder 70 from moving downward.

Then, with the movable stopper surface 75 in contact with the fixed stopper surface 65, the pulse P[0] is finally input to stop inputting the pulse train S in the reverse order. At this time, if the rotor side deviation angle α is 0 and the stator side deviation angle β is 0 in the electric valve 1 (α=0, β=0), as shown in FIG. , the fixed stopper surface 65 and the movable stopper surface 75 coincide with the axis M, and the center of the reference magnetic pole 85 and the center of the reference pole tooth 95 are aligned on the axis M.

Next, an example of a method for manufacturing the valve body assembly 5 will be described with reference to FIGS. 21 to 27.

21 to 27 are diagrams illustrating a method of manufacturing the valve body assembly of FIG. 2. FIG. 21 is a sectional view showing how the valve body, guide bush, and stopper member are assembled. FIG. 22 is a sectional view showing how the valve stem, valve body, valve closing spring, and washer are further assembled. FIG. 23 is a sectional view showing how the valve stem holder, rotor, and fixture are further assembled. 24 and 25 show a state in which the movable stopper abuts against the fixed stopper. FIG. 24 is a cross-sectional view. FIG. 25 is a plan view. 26 and 27 show a state in which the rotor has been rotated 180 degrees in the valve opening direction from the state shown in FIGS. 24 and 25. FIG. 26 is a cross-sectional view. FIG. 27 is a plan view.

As shown in FIG. 21, the conduit 12 and the conduit 13 are joined to the valve body 10. At this time, the axis L and the axis M should intersect at a right angle. Then, the fitting portion 51 of the guide bush 50 is press-fitted into the fitting hole 16 so that the positioning plane 16a of the fitting hole 16 and the D-cut plane 51a of the guide bush 50 are aligned. The guide bush 50 is arranged so that the axis M passes through the center of the D-cut plane 51a in the width direction (left-right direction in FIG. 4) when viewed from the direction of the axis L. The female screw 63 of the stopper member 60 is screwed into the male screw 53 of the guide bush 50, and the screwing is continued until the stopper body 61 of the stopper member 60 comes into contact with the fitting part 51 of the guide bush 50, and the stopper member 60 is attached to the guide bush 50. Fixed at 50. Thereby, the fixed stopper surface 65 coincides with the axis M when viewed from the axis L direction.

As shown in FIG. 22, the valve shaft 30 is inserted into the guide bush 50. A valve body 40 provided at the lower end of the valve shaft 30 contacts the valve seat 15. The upper end 31 of the valve stem 30 is inserted into the valve closing spring 77 and washer 76 .

As shown in FIG. 23, the valve stem holder 70 is fitted into the attachment hole 81 of the rotor 80. The upper end 31 of the valve stem 30 is inserted into the valve stem insertion hole 72a of the valve stem holder 70. The female thread 73 of the valve stem holder 70 is screwed into the male thread 53 of the guide bush 50.

As shown in FIGS. 24 and 25, the rotor 80 and the valve stem holder 70 are rotated in the valve closing direction, and the rotation is continued until the movable stopper surface 75 abuts against the fixed stopper surface 65. The upper end 31 of the valve stem 30 is inserted into the fixing part 36 of the fixture 35. The flange portion 37 of the fixture 35 is in contact with the upper wall portion 72 of the valve stem holder 70. At this point, the fixture 35 is not welded to the upper end 31 of the valve stem 30.

As shown in FIGS. 26 and 27, the rotor 80 is rotated by a predetermined angle (180 degrees in this embodiment) in the valve opening direction while the valve body 40 remains in contact with the valve seat 15. The fixture 35 moves upward together with the rotor 80 and the valve stem holder 70. Then, the fixing part 36 of the fixture 35 is welded to the upper end 31 of the valve shaft 30. A return spring 38 is arranged outside the fixture 35. The can 20 is joined to the upper end of the valve body 10 via the ring member 21. At this point, the valve body assembly 5 without the valve body assembly label 18 attached (that is, without the rotor side correction information Jr) is assembled.

The can 20 is inserted into a separately prepared reference stator unit 6S, and the conduit 12 is held by the clamping parts 112a, 112a of the positioning member 110. Thereby, the reference stator unit 6S is fixed to the valve body 10. In the reference stator unit 6S, the stator side deviation angle β is 0. Therefore, in the combination of the valve body assembly 5 without the rotor side correction information Jr and the reference stator unit 6S, there is no positional deviation around the axis L between the pole teeth of the stator 90 and the fixed stopper 64. Then, the valve body assembly label 18 including rotor-side correction information Jr related to the positional deviation between the magnetic poles of the rotor 80 and the movable stopper 74 around the axis L (rotor-side deviation angle α) is produced in the following manner.

A sufficient number of pulse trains S are input in reverse order to the stator 90 of the reference stator unit 6S so that the movable stopper surface 75 hits the fixed stopper surface 65, and finally pulse P[0] is input to repeat the pulse train S in the reverse order. Stop inputting. This operation is called "origin search." After returning to the origin, refrigerant is introduced into the conduit 12, and while measuring the amount of refrigerant flowing through the conduit 13, the pulse train S is input to the stator 90 one or more times in the normal order starting from the pulse P[0]. Note that the last pulse P[0] input during home search may also serve as the first pulse P[0] input in the normal order after home search.In other words, the pulse P[0] is The configuration may be such that only one input is required. Then, the number of pulses P input until the measured amount of refrigerant reaches a predetermined valve opening reference amount VS (rotor side valve opening pulse number Cr) is counted. Based on the rotor side valve opening pulse number Cr, a rotor side correction pulse number Kr corresponding to the rotor side deviation angle α is calculated. Note that the degree of opening of the valve port 14 when the amount of refrigerant flowing through the valve port 14 reaches a predetermined valve-opening reference amount VS is referred to as a "valve-opening point." Then, a two-dimensional barcode representing rotor side correction information Jr including the rotor side correction pulse number Kr is printed on the valve body assembly label 18. Apply the valve body assembly label 18 to the front of the valve body 10. In this way, the valve body assembly 5 is completed.

Next, an example of a method for manufacturing the stator unit 6 will be described.

The mold for the cover 100 is opened, and the stator 90 and the positioning member 110 are placed in the cavity of the mold. The mold is closed and the cavity is injected and filled with resin material. As a result, the stator unit 6 is insert-molded, and the stator 90, cover 100, and positioning member 110 are integrated. At this point, the stator unit 6 without the stator unit label 118 attached (that is, without the stator side correction information Js) is assembled. Note that the cover main body part 101 and the connector cover part 102 of the cover 100 may be integrally molded, or they may be molded separately and then welded together. Further, the cover 100 may be molded by a molding method other than injection molding (for example, cast molding).

The can 20 of the separately prepared standard valve body assembly 5S is inserted into the stator unit 6, and the conduit 12 is held by the clamping parts 112a, 112a of the positioning member 110. Thereby, the stator unit 6 is fixed to the valve body 10 of the reference valve body assembly 5S. The reference valve body assembly 5S has a rotor side deviation angle α of 0. Therefore, there is no positional deviation between the magnetic poles of the rotor 80 and the movable stopper 74 around the axis L. The stator unit label 118 includes stator side correction information Js regarding the positional deviation (stator side deviation angle β) between the pole teeth of the stator 90 and the fixed stopper 64 (positioning member 110) around the axis L in the following manner. Create.

A sufficient number of pulse trains S are repeatedly input in the reverse order to the stator 90 of the stator unit 6 so that the movable stopper surface 75 abuts against the fixed stopper surface 65, and finally a pulse P[0] is input to repeat the pulse train S in the reverse order. Stop input (return to origin). After returning to the origin, refrigerant is introduced into the conduit 12, and while measuring the amount of refrigerant flowing through the conduit 13, the pulse train S is input to the stator 90 one or more times in the normal order starting from the pulse P[0]. Note that the last pulse P[0] input during home search may also serve as the first pulse P[0] input in the normal order after home search.In other words, the pulse P[0] is The configuration may be such that only one input is required. Then, the number of pulses P input until the measured amount of refrigerant reaches a predetermined valve opening reference amount VS (stator side valve opening pulse number Cs) is counted. Based on the stator side valve opening pulse number Cs, a stator side correction pulse number Ks corresponding to the stator side deviation angle β is calculated. Then, a two-dimensional barcode representing stator-side correction information Js including the number of stator-side correction pulses Ks is printed on the stator unit label 118. A stator unit label 118 is attached to the front of the cover 100. In this way, the stator unit 6 is completed.

The electric valve 1 of this embodiment is configured so that when the rotor 80 is rotated by more than 180 degrees in the valve opening direction from the state where the movable stopper surface 75 butts against the fixed stopper surface 65, the valve body 40 separates from the valve seat 15. It is configured. When 48 pulses are input to the stator 90, the rotor 80 rotates 180 degrees. Therefore, if the motor-operated valve 1 has a rotor-side deviation angle α of 0 and a stator-side deviation angle β of 0 (referred to as a "standard motorized valve 1S"), 50 pulses P are generated in positive order from pulse P[0]. When inputted, the valve body 40 separates from the valve seat 15. Specifically, when pulse P[0] is input, the state is the same as the origin search, and after that, when 48 pulses P are input, the rotor 80 rotates 180 degrees, and one more pulse P is input. Then, the rotation of the rotor 80 exceeds 180 degrees. The number of pulses P (50) is defined as the reference valve opening pulse number CS. That is, the reference valve opening pulse number CS is the number of pulses that should be input from the originating state to the valve opening point in the reference electric valve 1S. In the reference electric valve 1S, the amount of refrigerant flowing through the conduit 13 when the pulses P of the reference valve opening pulse number CS are input in the normal order is set as the reference amount VS at valve opening. In manufacturing the valve body assembly 5, the rotor side corrected pulse number Kr is calculated by subtracting the reference valve opening pulse number CS from the rotor side valve opening pulse number Cr (Kr=Cr-CS). Similarly, in manufacturing the stator unit 6, the reference valve-opening pulse number CS is subtracted from the stator-side valve-opening pulse number Cs to calculate the stator-side corrected pulse number Ks (Ks=Cs-CS).

Due to improvements in manufacturing technology, the dimensional accuracy and assembly accuracy of parts has improved, so the rotor side deviation angle α of the valve body assembly 5 and the stator side deviation angle β of the stator unit 6 are suppressed within a relatively small angle range. There is. In this embodiment, the rotor side deviation angle α and the stator side deviation angle β are within the angle range in which the rotor 80 rotates when eight pulses included in the pulse train S are input (for example, the stator side deviation angle of A phase and B phase When the number of pole teeth is 24, the angle is suppressed to 3.75 degrees x 8 = 30 degrees). Therefore, the rotor side correction pulse number Kr corresponding to the rotor side deviation angle α is set to eight patterns, and the stator side correction pulse number Ks corresponding to the stator side deviation angle β is set to eight patterns. In this way, by keeping the pattern of the number of rotor side correction pulses Kr and the pattern of the number of stator side correction pulses Ks to a small number, the amount of information included in the valve body assembly label 18 and the stator unit label 118 can be reduced.

The rotor side correction pulse number Kr satisfies the following formula (1) when the number of pulses included in the pulse train S is N. However, Kr is an integer (the positive and negative signs indicate the direction of rotation), and N is an even natural number.
-((N/2)-1)≦Kr≦N/2... (1)
In this embodiment, N=8, and the rotor side correction pulse number Kr satisfies -3≦Kr≦+4.

FIG. 28 shows the patterns [a] to [h] of the rotor-side correction pulse number Kr, the rotor-side correction pulse number Kr, and the positional relationship between the magnetic pole of the rotor and the movable stopper in the originating state in a table format. . In FIG. 28, the positional relationship between the magnetic poles of the rotor and the movable stopper is expressed in the same way as in the lower diagrams of FIGS. 13 to 20, so the reference numerals of each component are omitted. Further, in FIG. 28, the stator side deviation angle β is 0.

In FIG. 28, in pattern [a], the reference magnetic pole 85 of the rotor 80 is not misaligned with respect to the movable stopper surface 75 (α=0), and the rotor-side correction pulse number Kr is “0”. In pattern [b], the reference magnetic pole 85 of the rotor 80 is shifted by one pulse in the valve opening direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "+1". In pattern [c], the reference magnetic pole 85 of the rotor 80 is shifted by two pulses in the valve opening direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "+2". In pattern [d], the reference magnetic pole 85 of the rotor 80 is shifted by 3 pulses in the valve opening direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "+3". In pattern [e], the reference magnetic pole 85 of the rotor 80 is shifted by 4 pulses in the valve opening direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "+4". In pattern [f], the reference magnetic pole 85 of the rotor 80 is shifted by 3 pulses in the valve closing direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "-3". In pattern [g], the reference magnetic pole 85 of the rotor 80 is shifted by two pulses in the valve closing direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "-2". In pattern [h], the reference magnetic pole 85 of the rotor 80 is shifted by one pulse in the valve closing direction with respect to the movable stopper surface 75, and the rotor side correction pulse number Kr is "-1".

The valve body assembly 5 having pattern [a] uses the same number of pulses as the number of pulses used for the reference valve body assembly 5S in which the rotor side deviation angle α is 0, so that the valve body assembly 5 has a configuration using the reference valve body assembly 5S. Similarly, the opening degree of the valve port 14 can be controlled. The valve body assemblies 5 having patterns [b] to [h] use the number of pulses that is obtained by correcting the number of pulses used for the reference valve body assembly 5S by the rotor side correction pulse number Kr. Similarly to the configuration used, the opening degree of the valve port 14 can be controlled.

Specifically, for example, in a configuration (referred to as "configuration A") in which the reference valve body assembly 5S and the stator unit 6 (the reference stator unit 6S may also be used), when the valve port 14 is set to a predetermined opening degree, Let the number of pulses used be the number of pulses PA. By using the pulse number obtained by adding the rotor side correction pulse number Kr to the pulse number PA in the configuration in which the valve body assembly 5 and the stator unit 6 that are the above patterns [a] to [h] are combined, the above configuration A can be achieved. Similarly, the opening degree of the valve port 14 can be controlled. That is, the rotor side correction pulse number Kr is an increase/decrease number for correcting the standard pulse number used in the standard valve body assembly 5S in which the rotor side deviation angle α is 0.

The stator side corrected pulse number Ks satisfies the following formula (2) when the number of pulses included in the pulse train S is N. However, Ks is an integer (the positive and negative signs indicate the direction of rotation), and N is an even natural number.
-((N/2)-1)≦Ks≦N/2... (2)
In this embodiment, N=8, and the stator side correction pulse number Ks satisfies -3≦Ks≦+4.

FIG. 29 shows patterns [1] to [8] of the number of stator side correction pulses Ks, the number of stator side correction pulses Ks, and the positional relationship between the stator pole teeth and the fixed stopper in the originating state in a table format. There is. In FIG. 29, the positional relationship between the pole teeth of the stator and the fixed stopper is expressed in the same way as in the lower diagrams of FIGS. 13 to 20, so the reference numerals of each component are omitted. Further, in FIG. 29, the rotor side deviation angle α is 0.

In FIG. 29, in pattern [1], the fixed stopper surface 65 is not displaced from the reference pole tooth 95 of the stator 90 (β=0), and the stator side correction pulse number Ks is “0”. In pattern [2], the fixed stopper surface 65 is shifted by one pulse in the valve opening direction with respect to the reference pole tooth 95 of the stator 90, and the stator side correction pulse number Ks is "+1". In pattern [3], the fixed stopper surface 65 is shifted by two pulses in the valve opening direction with respect to the reference pole tooth 95 of the stator 90, and the stator side correction pulse number Ks is "+2". In pattern [4], the fixed stopper surface 65 is shifted by three pulses in the valve opening direction with respect to the reference pole teeth 95 of the stator 90, and the stator side correction pulse number Ks is "+3". In pattern [5], the fixed stopper surface 65 is shifted by 4 pulses in the valve opening direction with respect to the reference pole tooth 95 of the stator 90, and the stator side correction pulse number Ks is "+4". In pattern [6], the fixed stopper surface 65 is shifted by three pulses in the valve closing direction with respect to the reference pole teeth 95 of the stator 90, and the stator side correction pulse number Ks is "-3". In pattern [7], the fixed stopper surface 65 is shifted by two pulses in the valve closing direction with respect to the reference pole tooth 95 of the stator 90, and the stator side correction pulse number Ks is "-2". In pattern [8], the fixed stopper surface 65 is shifted by one pulse in the valve closing direction with respect to the reference pole teeth 95 of the stator 90, and the stator side correction pulse number Ks is "-1".

The stator unit 6 of pattern [1] uses the same number of pulses as the number of pulses used for the reference stator unit 6S in which the stator side deviation angle β is 0, so that the stator unit 6 has a valve similar to the structure using the reference stator unit 6S. The opening degree of the mouth 14 can be controlled. The stator units 6 having patterns [2] to [8] are configured using the standard stator unit 6S by using the number of pulses obtained by correcting the number of pulses used for the standard stator unit 6S by the stator side correction pulse number Ks. Similarly, the opening degree of the valve port 14 can be controlled.

Specifically, for example, when the valve port 14 is set to a predetermined opening degree in a configuration (referred to as "configuration B") in which the reference stator unit 6S and the valve body assembly 5 (the reference valve body assembly 5S may also be used) are combined. Let the number of pulses used for this be the number of pulses PB. By using the pulse number obtained by adding the stator side correction pulse number Ks to the pulse number PB in the configuration in which the stator unit 6 and the valve body assembly 5 that correspond to the above patterns [1] to [8] are combined, the above configuration B can be achieved. Similarly, the opening degree of the valve port 14 can be controlled. That is, the stator side correction pulse number Ks is an increase/decrease number for correcting the standard pulse number used for the standard stator unit 6S in which the stator side deviation angle β is 0.

Next, an air conditioner having the electric valve 1 will be explained.

FIG. 30 shows an air conditioner 200. The air conditioner 200 performs cooling operation or heating operation. In FIG. 30, solid line arrows schematically indicate the flow of refrigerant during cooling operation, and broken line arrows schematically indicate the flow of refrigerant during heating operation. During cooling operation of the air conditioner 200, refrigerant flows from the compressor 201 to the flow path switching valve 202, the outdoor heat exchanger 203, the control valve 204, and the indoor heat exchanger 205 in this order, passes through the flow path switching valve 202, and is compressed again. It returns to machine 201 and circulates. During heating operation of the air conditioner 200, refrigerant flows from the compressor 201, through the flow path switching valve 202, the indoor heat exchanger 205, the control valve 204, and the outdoor heat exchanger 203 in this order, passes through the flow path switching valve 202, and then flows again. It returns to the compressor 201 and circulates. The electric valve 1 is used as a control valve 204 of the air conditioner 200.

The air conditioner 200 also includes an electronic control unit (not shown) that controls a compressor 201, a control valve 204, a fan, and the like. The electronic control unit controls the electric valve 1 as the control valve 204 via the control device 210. The control device 210 is composed of, for example, a microcomputer having a nonvolatile memory. The control device 210 controls the flow rate of the refrigerant by adjusting the opening degree of the valve port 14 of the electric valve 1 as the control valve 204 during cooling operation and heating operation. The control device 210 may be incorporated into the stator unit 6 of the electric valve 1. In this embodiment, the control device 210 and the electronic control unit are separate bodies, but the control device 210 is integrated with the electronic control unit so that the electronic control unit directly controls the control valve 204. Good too.

As described above, in the individual electric valves 1 incorporated in the air conditioner 200, the rotor side deviation angle α and the stator side deviation angle β may differ, that is, from the originating state to the valve opening point. The number of pulses to be input (valve opening pulse number C) may be different. Therefore, the control device 210 obtains the valve opening pulse number C based on the rotor side correction information Jr and the stator side correction information Js read from the valve body assembly label 18 and the stator unit label 118 of the electric valve 1, and Accurately grasp the valve opening point of step 1.

The memory of the control device 210 stores the number of pulses (standard valve opening pulse number CS) that should be input from the originating state to the valve opening point in the reference electric valve 1S. Further, the memory of the control device 210 stores rotor side correction information Jr and stator side correction information Js of the electric valve 1 read using a barcode reader. The reference valve opening pulse number CS, the rotor side correction information Jr, and the stator side correction information Js are stored in a memory when the air conditioner 200 is manufactured, for example.

The control device 210 obtains the rotor side correction pulse number Kr and the stator side correction pulse number Ks from the rotor side correction information Jr and the stator side correction information Js. The control device 210 calculates the corrected pulse number K based on the rotor side corrected pulse number Kr and the stator side corrected pulse number Ks. Then, the control device 210 uses the value obtained by adding the corrected pulse number K to the reference valve opening pulse number CS as the valve opening pulse number C of the electric valve 1 incorporated in the air conditioner. The control device 210 adjusts the opening degree of the valve port 14 using the opening degree of the valve port 14 when the valve opening pulse number C is inputted as a reference (valve opening point).

The number of corrected pulses K is calculated using the following equations (3a), (3b), and (3c).
K=Kr+Ks... (3a)
However, -((N/2)-1)≦Kr+Ks≦N/2
K=Kr+Ks-N... (3b)
However, Kr+Ks>N/2
K=Kr+Ks+N... (3c)
However, -((N/2)-1)>Kr+Ks

FIG. 31 shows the corrected pulse number K calculated based on the rotor side corrected pulse number Kr and the stator side corrected pulse number Ks.

In this embodiment, the rotor side correction information Jr includes the rotor side correction pulse number Kr, and the stator side correction information Js includes the stator side correction pulse number Ks, but the rotor side correction information Jr and the stator side correction Information Js is not limited to this configuration. For example, the control device 210 stores in advance a table as shown in FIG. 31 in the memory. It is assumed that the rotor side correction information Jr includes symbols (ah) corresponding to the rotor side correction pulse number Kr, and the stator side correction information Js includes symbols (1 to 8) corresponding to the stator side correction pulse number Ks. Then, the control device 210 may obtain a symbol from the rotor side correction information Jr and the stator side correction information Js and apply it to a table to obtain the correction pulse number K.

32 to 39 show the valve opening operation of the electric valve 1 from the originating state. 32 to 39 explain the valve opening operation in the configuration corresponding to the hatched part in FIG. 31 (corrected pulse number K=0, +1, +2, +3, +4, -3, -2, -1). However, the valve opening operation is similar for structures other than the hatched portions in FIG. In FIGS. 32 to 39, (i) to (viii) are arranged in chronological order and show states in which pulses P[0] to P[7] are input to the stator 90.

FIG. 32 shows the valve opening operation of the electric valve 1 in which the correction pulse number K becomes 0 (Kr=0, Ks=0). When the pulse P[0] is input to the stator 90 after returning to the origin, the motor-operated valve 1 enters a state in which the movable stopper surface 75 abuts against the fixed stopper surface 65. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the positive order of pulses P[1], P[2], etc., the movable stopper surface 75 gradually moves away from the fixed stopper surface 65. . The electric valve 1 reaches its valve opening point when a pulse P having a reference valve opening pulse number CS is input.

FIG. 33 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K is 1 (Kr=1, Ks=0). When the pulse P[0] is input to the stator 90 after returning to the origin, the motor-operated valve 1 enters a state in which the movable stopper surface 75 abuts against the fixed stopper surface 65. In the motor-operated valve 1, even when the pulse P[1] is input to the stator 90, the movable stopper surface 75 remains in abutment against the fixed stopper surface 65. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the positive order of pulses P[2], P[3], etc., the movable stopper surface 75 gradually moves away from the fixed stopper surface 65. . That is, in this electric valve 1, the rotor 80 rotates in the valve opening direction with a delay of one pulse. The electric valve 1 reaches the valve opening point when a number of pulses P equal to the reference valve opening pulse number CS plus 1 is input.

FIG. 34 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K is 2 (Kr=2, Ks=0). When the pulse P[0] is input to the stator 90 after returning to the origin, the motor-operated valve 1 enters a state in which the movable stopper surface 75 abuts against the fixed stopper surface 65. In the motor-operated valve 1, even if pulses P[1] to P[2] are sequentially input to the stator 90, the movable stopper surface 75 remains in contact with the fixed stopper surface 65. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the positive order of pulses P[3], P[4], etc., the movable stopper surface 75 gradually moves away from the fixed stopper surface 65. . That is, in this electric valve 1, the rotor 80 rotates in the valve opening direction with a delay of two pulses. The electric valve 1 reaches the valve opening point when a number of pulses P equal to the reference valve opening pulse number CS plus 2 is input.

FIG. 35 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K is 3 (Kr=3, Ks=0). When the pulse P[0] is input to the stator 90 after returning to the origin, the motor-operated valve 1 enters a state in which the movable stopper surface 75 abuts against the fixed stopper surface 65. In the motor-operated valve 1, even if pulses P[1] to P[3] are sequentially input to the stator 90, the movable stopper surface 75 remains in contact with the fixed stopper surface 65. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the positive order of pulses P[4], P[5], etc., the movable stopper surface 75 gradually moves away from the fixed stopper surface 65. . That is, in this electric valve 1, the rotor 80 rotates in the valve opening direction with a delay of three pulses. The electric valve 1 reaches the valve opening point when a number of pulses P equal to the reference valve opening pulse number CS plus 3 are input.

FIG. 36 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K is 4 (Kr=4, Ks=0). When the pulse P[0] is input to the stator 90 after returning to the origin, the motor-operated valve 1 enters a state in which the movable stopper surface 75 abuts against the fixed stopper surface 65. In the motor-operated valve 1, even if pulses P[1] to P[4] are sequentially input to the stator 90, the movable stopper surface 75 remains in contact with the fixed stopper surface 65. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the positive order of pulses P[5], P[6], etc., the movable stopper surface 75 gradually moves away from the fixed stopper surface 65. . That is, in this electric valve 1, the rotor 80 rotates in the valve opening direction with a delay of four pulses. The electric valve 1 reaches the valve opening point when a number of pulses P equal to the reference valve opening pulse number CS plus 4 is input. Note that, as shown in FIG. 36(i), the electric valve 1 with a correction pulse number K of 4 operates with the movable stopper surface 75 in contact with the fixed stopper surface 65 when the pulse P[0] is input. The reference pole tooth 95 of the stator 90 (the N pole marked with a black circle) and the N pole adjacent to the reference magnetic pole 85 of the rotor 80 (the S pole marked with a black circle) are opposed to each other. Therefore, when vibration is applied to the electric valve 1, the S pole (magnetic pole that is not the reference magnetic pole 85) adjacent to the N pole facing the reference pole tooth 95 in the rotor 80 is attracted to the reference pole tooth 95, and the rotor 80 opens. There is a risk of it shifting in the direction of the valve. Therefore, when combining the valve body assembly 5 and the stator unit 6, it is desirable to avoid combinations in which the number of corrected pulses K is 4.

FIG. 37 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K is -3 (Kr=-3, Ks=0). In the motor-operated valve 1, when a pulse P[0] is input to the stator 90 after returning to the origin, the movable stopper surface 75 moves away from the fixed stopper surface 65 to a position advanced by three pulses. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the normal order of pulses P[1], P[2], . . . , the movable stopper surface 75 moves further away from the fixed stopper surface 65. That is, in this electric valve 1, the rotor 80 advances by three pulses and rotates in the valve opening direction. The electric valve 1 reaches the valve opening point when a number of pulses P obtained by subtracting 3 from the reference valve opening pulse number CS is input.

FIG. 38 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K is -2 (Kr=-2, Ks=0). In the motor-operated valve 1, when a pulse P[0] is input to the stator 90 after returning to the origin, the movable stopper surface 75 moves away from the fixed stopper surface 65 to a position advanced by two pulses. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the normal order of pulses P[1], P[2], . . . , the movable stopper surface 75 moves further away from the fixed stopper surface 65. That is, in this electric valve 1, the rotor 80 advances by two pulses and rotates in the valve opening direction. The electric valve 1 reaches the valve opening point when the number of pulses P obtained by subtracting 2 from the reference valve opening pulse number CS is input.

FIG. 39 shows the valve opening operation of the electric valve 1 in which the number of corrected pulses K becomes -1 (Kr=-1, Ks=0). In the motor-operated valve 1, when a pulse P[0] is input to the stator 90 after returning to the origin, the movable stopper surface 75 moves away from the fixed stopper surface 65 to a position advanced by one pulse. Then, in the electric valve 1, when the pulse train S is input to the stator 90 in the normal order of pulses P[1], P[2], . . . , the movable stopper surface 75 moves further away from the fixed stopper surface 65. That is, in this electric valve 1, the rotor 80 advances by one pulse and rotates in the valve opening direction. The electric valve 1 reaches the valve opening point when a number of pulses P obtained by subtracting 1 from the reference valve opening pulse number CS is input.

As described above, the electric valve 1 of this embodiment includes the valve body assembly 5 and the stator unit 6. The valve body assembly 5 includes a valve body 10 provided with a valve port 14, a rotor 80 having a plurality of magnetic poles rotatably arranged with respect to the valve body 10, and a movable stopper 74 fixed with respect to the rotor 80. a fixed stopper 64 that is fixed to the valve body 10 and restricts the rotation of the rotor 80 in the valve closing direction when the movable stopper 74 abuts against it; It has a valve body 40. The stator unit 6 includes a stator 90 having a plurality of pole teeth, and a positioning member 110 for positioning the stator 90 with respect to the valve body assembly 5. Rotor-side correction information Jr, which includes information regarding the deviation angle between the magnetic poles of the rotor 80 and the movable stopper 74 (rotor-side deviation angle α), is attached to the outer surface of the valve body assembly 5. Further, stator side correction information Js including information regarding the deviation angle between the pole teeth of the stator 90 and the positioning member 110 (stator side deviation angle β) is attached to the outer surface of the stator unit 6.

The electric valve 1 includes a rotor 80 and a stator 90, and constitutes a stepping motor. The information related to the rotor side deviation angle α is information indicating the number of pulses (rotor side correction pulse number Kr) necessary for rotating the rotor 80 by the rotor side deviation angle α in the stepping motor. The rotor-side correction pulse number Kr is a relative increase/decrease in the number of pulses used for the valve body assembly 5 in which the rotor-side deviation angle α is 0. The information related to the stator side deviation angle β is information indicating the number of pulses (stator side correction pulse number Ks) necessary to rotate the rotor 80 by the stator side deviation angle β in the stepping motor. The stator side correction pulse number Ks is a relative increase/decrease in the number of pulses used for the stator unit 6 in which the stator side deviation angle β is 0. When the number of pulses included in the pulse train S input to the stepping motor when rotating the rotor 80 in the valve opening direction is N, the following equations (1) and (2) are satisfied.
-((N/2)-1)≦Kr≦N/2... (1)
-((N/2)-1)≦Ks≦N/2... (2)
However, Kr and Ks are integers, and N is an even natural number.

Moreover, the air conditioner 200 having the electric valve 1 is configured to control the electric valve 1 based on the rotor side correction information Jr and the stator side correction information Js.

Moreover, the air conditioner 200 is configured to control the electric valve 1 based on the corrected pulse number K calculated using the following equations (3a), (3b), and (3c).
K=Kr+Ks... (3a)
However, -((N/2)-1)≦Kr+Ks≦N/2
K=Kr+Ks-N... (3b)
However, Kr+Ks>N/2
K=Kr+Ks+N... (3c)
However, -((N/2)-1)>Kr+Ks

The method for manufacturing the valve body assembly 5 used in the electric valve 1 is as follows. A valve body assembly 5 without rotor side correction information Jr is manufactured. A reference stator unit 6S is prepared. A stepping motor is configured by a rotor 80 and a stator 90 by combining a valve body assembly 5 without rotor side correction information Jr and a reference stator unit 6S. The pulse train S input to the stepping motor when rotating the rotor 80 in the valve opening direction (pulse train S includes N pulses assigned the order from [0] to [N-1]) is performed in reverse order. is input to the stepping motor one or more times to rotate the rotor 80 in the valve closing direction until the movable stopper 74 abuts the fixed stopper 64. After the movable stopper 74 hits the fixed stopper 64, if pulse number [0] is inputted, the inputting of the pulse train in the reverse order is stopped. Then, the pulse train S is input to the stepping motor one or more times in the positive order starting from the pulse number [0], and the number of pulses input until the valve port 14 reaches the opening degree through which the standard amount of fluid flows (rotor side valve opening pulse number Cr), and generates rotor side correction information Jr including information regarding the rotor side deviation angle α based on the rotor side valve opening pulse number Cr. Then, a valve body assembly label 18 on which rotor side correction information Jr generated based on the rotor side valve opening pulse number Cr is printed is attached to the outer surface of the valve body assembly 5 that does not have the rotor side correction information Jr. The rotor side correction information Jr is information related to flow rate control. Note that the rotor side correction information Jr may include the rotor side valve opening pulse number Cr. Further, as the rotor side valve opening pulse number Cr, the number of pulses input until the opening degree is reached at which the increment of the flow rate with respect to the input of one pulse changes may be counted. In other words, when inputting one pulse at a time, the flow rate at the valve port 14 increases by X, and when inputting one pulse at a certain point T, the flow rate increases by Y (Y≠X), then Let the number of pulses be the rotor side valve opening pulse number Cr. In this configuration, the flow rate change point at which the increment of the flow rate changes with respect to the pulse input is used as a reference for controlling the opening degree of the valve port 14.

The method for manufacturing the stator unit 6 used in the electric valve 1 is as follows. A stator unit 6 without stator side correction information Js is manufactured. A reference valve body assembly 5S is prepared. A stepping motor is configured by a rotor 80 and a stator 90 by combining a stator unit 6 without stator side correction information Js and a reference valve body assembly 5S. The pulse train S input to the stepping motor when rotating the rotor 80 in the valve opening direction (pulse train S includes N pulses assigned the order from [0] to [N-1]) is performed in reverse order. is input to the stepping motor one or more times to rotate the rotor 80 in the valve closing direction until the movable stopper 74 abuts the fixed stopper 64. After the movable stopper 74 hits the fixed stopper 64, if pulse number [0] is inputted, the inputting of the pulse train in the reverse order is stopped. Then, the pulse train S is inputted to the stepping motor one or more times in positive order starting from pulse number [0], and the number of pulses inputted until the valve port 14 reaches the opening degree through which the standard amount of fluid flows (stator side valve opening pulse Count the number Cs). Based on the stator side valve opening pulse number Cs, stator side correction information Js including information related to the stator side deviation angle β is generated. Then, a stator unit label 118 on which stator side correction information Js generated based on the stator side valve opening pulse number Cs is printed is attached to the outer surface of the stator unit 6 that does not have the stator side correction information Js. The stator side correction information Js is information related to flow rate control. Note that the stator side correction information Js may include the stator side valve opening pulse number Cs. Further, as the number of stator side valve opening pulses Cs, the number of pulses input until the opening degree at which the increment of the flow rate changes with respect to the input of one pulse may be counted. In other words, when inputting one pulse at a time, the flow rate at the valve port 14 increases by X, and when inputting one pulse at a certain point T, the flow rate increases by Y (Y≠X), then Let the number of pulses be the stator side valve opening pulse number Cs. In this configuration, the flow rate change point at which the increment of the flow rate changes with respect to the pulse input is used as the reference for controlling the opening degree of the valve port 14.

According to the motor-operated valve 1, the rotor-side correction information Jr, which includes information regarding the deviation angle between the magnetic poles of the rotor 80 and the movable stopper 74 (rotor-side deviation angle α), is attached to the outer surface of the valve body assembly 5. Stator side correction information Js including information regarding the deviation angle (stator side deviation angle β) between the pole teeth of the stator 90 and the positioning member 110 is attached to the outer surface of the stator unit 6. Because of this, when the electric valve 1 is configured by combining the valve body assembly 5 and the stator unit 6, based on the rotor side correction information Jr and the stator side correction information Js attached to the respective outer surfaces, The opening position (valve opening point) of the electric valve 1 can be accurately grasped. Therefore, the flow rate of the refrigerant flowing through the electric valve 1 can be accurately controlled.

In the above embodiment, both the deviation angle between the magnetic poles of the rotor 80 and the movable stopper 74 (rotor side deviation angle α) and the deviation angle between the pole teeth of the stator 90 and the positioning member 110 (stator side deviation angle β) are corrected. Information is attached to the outer surfaces of the valve body assembly 5 and stator unit 6. However, only one of the rotor side deviation angle α and the stator side deviation angle β may be attached as the correction information. When the valve body assembly 5 and the stator unit 6 are manufactured using a manufacturing apparatus suitable for mass production, the distribution of the rotor side deviation angle α and the stator side deviation angle β may be biased depending on the characteristics of the manufacturing apparatus. If a significant deviation in the distribution of deviation angles is observed in only one of the valve body assembly 5 and the stator unit 6, it is considered that there is little variation in quality for that one. In such a case, in the electric valve 1, by omitting the correction information for one of the valve body assembly 5 and the stator unit 6 and adding correction information only to the other, the error range of the valve opening point can be made smaller than that of the conventional electric valve. (for example, 4 pulses or less) while reducing the manufacturing process. A configuration in which correction information for one of the valve body assembly 5 and the stator unit 6 is omitted is effective in reducing manufacturing costs, as long as the error range of the valve opening point is allowable.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Additions, deletions, and design changes to the above-mentioned embodiments by those skilled in the art as appropriate, as well as combinations of features of the embodiments, may also be incorporated into the present invention, as long as they do not go against the spirit of the present invention. included in the range.

DESCRIPTION OF SYMBOLS 1... Electric valve, 1S... Reference motorized valve, 5... Valve body assembly, 5S... Reference valve body assembly, 6... Stator unit, 6a... Inner peripheral surface, 6S... Reference stator unit, 10... Valve body, 11... Valve chamber , 12, 13... Conduit, 14... Valve port, 15... Valve seat, 16... Fitting hole, 16a... Positioning plane, 18... Valve body assembly label, 20... Can, 21... Ring member, 30... Valve stem, 31 ...Top end, 32...Spring receiving part, 35...Fixing tool, 36...Fixing part, 37...Flange part, 38...Return spring, 40...Valve body, 50...Guide bush, 51...Fitting part, 51a...D cut Plane, 53... Male thread, 53a... Virtual lower end position, 60... Stopper member, 61... Stopper body, 63... Female thread, 63a... Virtual lower end position, 64... Fixed stopper, 65... Fixed stopper surface, 70... Valve stem holder, 71 ...Surrounding wall part, 71a...Convex part, 72...Top wall part, 72a...Valve shaft insertion hole, 73...Female thread, 74...Movable stopper, 75...Movable stopper surface, 76...Washer, 77...Valve closing spring, 80...Rotor , 81...Mounting hole, 81a...Recess, 85...Reference magnetic pole, 90...Stator, 91...A phase stator, 92...Yoke, 92a...Downward pole tooth, 92b...Upward pole tooth, 93...Coil, 95...Reference pole tooth , 96...B phase stator, 97...Yoke, 97a...Downward pole tooth, 97b...Upward pole tooth, 98...Coil, 100...Cover, 101...Cover body part, 102...Connector cover part, 103...Connector, 110...Positioning Member, 111... flat plate part, 112... arm part, 112a... clamping part, 118... stator unit label, 200... air conditioner, 201... compressor, 202... flow path switching valve, 203... outdoor heat exchanger, 204... Control valve, 205...Indoor heat exchanger, 210...Control device, Jr...Rotor side correction information, Js...Stator side correction information, α...Rotor side deviation angle, β...Stator side deviation angle, Cr...Rotor side valve opening pulse Cs...Number of valve opening pulses on the stator side, C...Number of valve opening pulses, CS...Number of standard valve opening pulses, K...Number of correction pulses, Kr...Number of correction pulses on the rotor side, Ks...Number of correction pulses on the stator side, VS... Reference amount at valve opening, P...Pulse, S...Pulse train, F...Extension line, G...Center line, L...Axis line, M...Axis line

Claims (10)

A valve body assembly used in an electric valve, the valve body assembly comprising:
a valve body provided with a valve port;
a cylindrical rotor having a plurality of magnetic poles rotatably arranged with respect to the valve body;
a movable stopper fixed to the rotor and having a planar movable stopper surface along the radial direction ;
a fixed stopper that is fixed to the valve body and restricts the rotation of the rotor in the valve closing direction by abutting against the movable stopper surface ;
a valve body that changes the opening degree of the valve port according to the rotation of the rotor;
Rotor side correction information including information regarding a deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is attached to the outer surface of the valve body assembly. A valve body assembly characterized in that:
However, the rotor side deviation angle is between a first line extending in the radial direction passing through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and a first line extending in the radial direction passing through the central axis of the rotor and along the movable stopper surface. This is the angle formed by the extended line, and the shift angle toward the rotor when the first line and the extended line overlap is 0. The rotor constitutes a stepping motor together with a stator of a stator unit,
The information related to the rotor side deviation angle is information indicating the number of pulses (hereinafter referred to as "rotor side correction pulse number Kr") necessary for rotating the rotor by the rotor side deviation angle in the stepping motor. ,
The rotor side correction pulse number Kr is a relative increase/decrease number with respect to the pulse number used for the valve body assembly in which the rotor side deviation angle is 0,
The valve body assembly according to claim 1, wherein the following formula (1) is satisfied when the number of pulses included in the pulse train input to the stepping motor when rotating the rotor in the valve opening direction is N.
-((N/2)-1)≦Kr≦N/2... (1)
However, Kr is an integer, and N is an even natural number. A stator unit used in an electric valve,
a cylindrical stator having a plurality of pole teeth;
a positioning member for positioning the stator relative to the valve body assembly;
Stator side correction information including information regarding a deviation angle between the pole teeth of the stator and the positioning member around the central axis of the stator (hereinafter referred to as "stator side deviation angle") is attached to the outer surface of the stator unit. A stator unit characterized by:
However, the stator side deviation angle is between a second line extending in the radial direction passing through the central axis of the stator and the center of the reference pole tooth of the stator, and a second line extending in the radial direction passing through the central axis of the stator and the center of the positioning member. This is an angle formed by the extending center line, and the stator side shift angle is 0 when the second line and the center line overlap. the stator, together with the rotor of the valve body assembly, forms a stepper motor;
The information related to the stator side deviation angle is information indicating the number of pulses (hereinafter referred to as "stator side correction pulse number Ks") necessary for rotating the rotor by the stator side deviation angle in the stepping motor. ,
The stator side correction pulse number Ks is a relative increase/decrease with respect to the pulse number used for the stator unit in which the stator side deviation angle is 0,
The stator unit according to claim 3, which satisfies the following formula (2) when the number of pulses included in the pulse train input to the stepping motor when rotating the rotor in the valve opening direction is N.
-((N/2)-1)≦Ks≦N/2... (2)
However, Ks is an integer, and N is an even natural number. A motor-operated valve having a valve body assembly and a stator unit, the motor-operated valve comprising:
The valve body assembly includes a valve body having a valve port, a cylindrical rotor having a plurality of magnetic poles rotatably disposed with respect to the valve body, and a radially fixed rotor with respect to the rotor. a movable stopper having a planar movable stopper surface along the valve body ; a fixed stopper that is fixed to the valve body and restricts rotation of the rotor in the valve closing direction when the movable stopper surface abuts; and rotation of the rotor. a valve body that changes the opening degree of the valve port according to the
The stator unit has a cylindrical stator having a plurality of pole teeth, and a positioning member for positioning the stator with respect to the valve body assembly,
The rotor and the stator are coaxially arranged and constitute a stepping motor,
Rotor side correction information including information regarding a deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is attached to the outer surface of the valve body assembly. has been
Stator side correction information including information regarding a deviation angle between the pole teeth of the stator and the positioning member around the central axis of the stator (hereinafter referred to as "stator side deviation angle") is attached to the outer surface of the stator unit. An electric valve characterized by:
however,
The rotor side deviation angle includes a first line extending in the radial direction through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and an extension extending in the radial direction through the central axis of the rotor and along the movable stopper surface. line, and the rotor side deviation angle when the first line and the extension line overlap is 0,
The stator side deviation angle includes a second line extending radially through the central axis of the stator and the center of the reference pole teeth of the stator, and a center extending radially through the central axis of the stator and the center of the positioning member. The stator side deviation angle is 0 when the second line and the center line overlap. The information related to the rotor side deviation angle is information indicating the number of pulses (hereinafter referred to as "rotor side correction pulse number Kr") necessary for rotating the rotor by the rotor side deviation angle in the stepping motor. ,
The rotor side correction pulse number Kr is a relative increase/decrease number with respect to the pulse number used for the valve body assembly in which the rotor side deviation angle is 0,
The information related to the stator side deviation angle is information indicating the number of pulses (hereinafter referred to as "stator side correction pulse number Ks") necessary for rotating the rotor by the stator side deviation angle in the stepping motor. ,
The stator side correction pulse number Ks is a relative increase/decrease with respect to the pulse number used for the stator unit in which the stator side deviation angle is 0,
According to claim 5, when the number of pulses included in the pulse train input to the stepping motor when rotating the rotor in the valve opening direction is N, the following formulas (1) and (2) are satisfied. electric valve.
-((N/2)-1)≦Kr≦N/2... (1)
-((N/2)-1)≦Ks≦N/2... (2)
However, Kr and Ks are integers, and N is an even natural number. An air conditioner having the electric valve according to claim 5,
An air conditioner configured to control the electric valve based on the rotor side correction information and the stator side correction information. An air conditioner having the electric valve according to claim 6,
The electric valve is configured to be controlled based on the number of pulses (hereinafter referred to as "corrected pulse number K") calculated using the following equations (3a), (3b), and (3c). , air conditioner.
K=Kr+Ks... (3a)
However, -((N/2)-1)≦Kr+Ks≦N/2
K=Kr+Ks-N... (3b)
However, Kr+Ks>N/2
K=Kr+Ks+N... (3c)
However, -((N/2)-1)>Kr+Ks A method of manufacturing a valve body assembly used in an electric valve, the method comprising:
A valve body provided with a valve port, a cylindrical rotor having a plurality of magnetic poles rotatably arranged with respect to the valve body, and a planar movable member fixed to the rotor and movable along a radial direction. a movable stopper having a stopper surface ; a fixed stopper that is fixed to the valve body and restricts rotation of the rotor in the valve closing direction when the movable stopper surface abuts against the valve body; A valve body assembly having no rotor-side correction information, which has a valve body that changes the opening degree of the valve body,
a cylindrical stator having a plurality of pole teeth; and a positioning member for positioning the stator with respect to the valve body assembly, the center of the stator between the pole teeth of the stator and the positioning member. Prepare a reference stator unit whose deviation angle around the axis (hereinafter referred to as "stator side deviation angle") is 0,
A stepping motor is configured by combining the valve body assembly without rotor side correction information and the reference stator unit, and arranging the rotor and the stator coaxially ,
A pulse train that is input to the stepping motor when rotating the rotor in the valve opening direction (however, the pulse train includes N pulses assigned orders from [0] to [N-1]) in reverse order. input to the stepping motor one or more times to rotate the rotor in the valve closing direction until the movable stopper surface abuts the fixed stopper,
After the movable stopper surface hits the fixed stopper, when pulse number [0] is input, the input of the pulse train in the reverse order is stopped, and the pulse train is sent to the stepping motor in the forward order starting from pulse number [0]. The number of pulses input (hereinafter referred to as (referred to as the "rotor side valve opening pulse number"),
Based on the number of differences between the number of rotor-side valve opening pulses and the reference valve-opening pulse number , the deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is determined. ) generates the rotor side correction information including information related to
A method of manufacturing a valve body assembly, characterized in that the rotor side correction information including the information related to the rotor side deviation angle is attached to an outer surface of the valve body assembly without the rotor side correction information.
However, the number of reference valve opening pulses is the same as the number of valve opening pulses on the rotor side obtained in a reference electric valve that combines the reference valve body assembly and the reference stator unit in which the rotor side deviation angle is 0. ,
The rotor side deviation angle includes a first line extending in the radial direction through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and an extension extending in the radial direction through the central axis of the rotor and along the movable stopper surface. line, and the rotor side deviation angle when the first line and the extension line overlap is 0,
The stator side deviation angle includes a second line extending radially through the central axis of the stator and the center of the reference pole teeth of the stator, and a center extending radially through the central axis of the stator and the center of the positioning member. The stator side deviation angle is 0 when the second line and the center line overlap. A method for manufacturing a stator unit used in an electric valve, the method comprising:
Producing a stator unit without stator side correction information, the stator unit having a cylindrical stator having a plurality of pole teeth and a positioning member for positioning the stator with respect to the valve body assembly,
A valve body provided with a valve port, a cylindrical rotor having a plurality of magnetic poles rotatably arranged with respect to the valve body, and a planar movable member fixed to the rotor and movable along a radial direction. a movable stopper having a stopper surface ; a fixed stopper that is fixed to the valve body and restricts rotation of the rotor in the valve closing direction when the movable stopper surface abuts against the valve body; a valve body that changes the opening degree of the rotor, and a standard in which a deviation angle between the magnetic poles of the rotor and the movable stopper around the central axis of the rotor (hereinafter referred to as "rotor side deviation angle") is 0. Prepare the valve body assembly,
A stepping motor is configured by combining the stator unit without stator side correction information and the reference valve body assembly, and arranging the rotor and the stator coaxially ,
A pulse train that is input to the stepping motor when rotating the rotor in the valve opening direction (however, the pulse train includes N pulses assigned orders from [0] to [N-1]) in reverse order. input to the stepping motor one or more times to rotate the rotor in the valve closing direction until the movable stopper surface abuts the fixed stopper,
After the movable stopper surface hits the fixed stopper, when pulse number [0] is input, the input of the pulse train in the reverse order is stopped, and the pulse train is sent to the stepping motor in the forward order starting from pulse number [0]. The number of pulses input (hereinafter referred to as (referred to as the "stator side valve opening pulse number"),
Based on the number of differences between the stator side valve opening pulse number and the reference valve opening pulse number , the deviation angle of the stator pole teeth and the positioning member around the central axis of the stator (hereinafter referred to as "stator side deviation angle") ) generates the stator side correction information including information related to
A method for manufacturing a stator unit, characterized in that the stator side correction information including the information related to the stator side deviation angle is attached to an outer surface of the stator unit that does not have the stator side correction information.
However, the number of reference valve opening pulses is the same as the number of valve opening pulses on the stator side obtained in a reference electric valve that combines the reference valve main body assembly and the reference stator unit in which the stator side deviation angle is 0. ,
The rotor side deviation angle includes a first line extending in the radial direction through the central axis of the rotor and the center of the reference magnetic pole of the rotor, and an extension extending in the radial direction through the central axis of the rotor and along the movable stopper surface. line, and the rotor side deviation angle when the first line and the extension line overlap is 0,
The stator side deviation angle includes a second line extending radially through the central axis of the stator and the center of the reference pole teeth of the stator, and a center extending radially through the central axis of the stator and the center of the positioning member. The stator side deviation angle is 0 when the second line and the center line overlap.

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