JP4515045B2 - Motorized valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric valve used by being incorporated in an air conditioner, a refrigerator, or the like, and more particularly, to an electric valve that eliminates a discharge between a magnetic pole tooth of a stepping motor and a can that houses a rotor.
[0002]
[Prior art]
Conventionally, an electric valve used by being incorporated in this type of air conditioner, refrigerator, etc. is a device that adjusts the flow rate of a fluid such as a refrigerant, and usually includes a valve body having a valve chamber and a valve seat, A cylindrical can with a bottom fixed to the upper part of the valve body through a hook-shaped portion, and a rotor is built inside the can, and an insertion hole is formed in the center portion outside the can. The stator which has is externally fitted (for example, refer patent document 1).
[0003]
With reference to the sectional view of FIG. 6, the structure of a conventional electric valve disclosed in Patent Document 1. The electric valve 10 includes a valve body 20, a rotor 30, a can 40, and a stator 50. The rotor 30 and the stator 50 constitute a stepping motor.
[0004]
The brass valve body 20 is a means for adjusting the flow rate of the refrigerant, and includes a valve chamber 21 and a valve seat 22 to which the valve body 23 is contacted and separated. The valve main body 20 is supported and fixed by a brass guide bush 26 on which a brass flange 47 and a plastic fixing stopper 27 are fixedly supported. The guide bush 26 is formed in a hollow cylindrical shape, and a fixing screw portion 25 is provided above the outer peripheral surface thereof, and a spiral groove 26a to which a plastic fixing stopper 27 formed by injection molding is fixed below is provided at an intermediate portion therebetween. Is provided with a pressure equalizing hole 32a for equalizing the pressure in the space inside the valve chamber 21 and the can 40, and a brass valve shaft 24 having a valve body 23 formed at the tip is slidably inserted into the hollow hole. ing. The outer periphery of the bowl-shaped plate 47 supports and fixes the lower opening of the can 40. A fluid introduction pipe 20 a is connected and fixed to the valve seat 21 below the valve seat 22.
[0005]
The rotor 30 is made of, for example, a magnetized magnetic material and has a cylindrical shape. A valve shaft holder 32 is inserted and fixed in the hollow hole via a plastic movement stopper 37. The valve shaft holder 32 is formed into a bottomed cylindrical shape using brass, and a moving screw portion 31 is formed on the inner peripheral wall thereof, and a spiral groove portion 32b is formed on the outer peripheral wall thereof. A plastic movement stopper 37 is fixed to the spiral groove 32b by injection molding. A support ring 36 fixed to the rotor 30 is supported and fixed to the valve shaft holder 32 by caulking the upper opening of the valve shaft holder 32, and the rotor 30 and the valve shaft holder 32 are integrated.
[0006]
The guide bush 26 is inserted into the valve shaft holder 32, and the fixing screw portion 25 provided on the guide bush 26 and the moving screw portion 31 provided on the valve shaft holder 32 are screwed together to form a screw feed mechanism. .
[0007]
The upper end portion of the valve shaft 24 inserted into the hollow hole of the guide bush 26 passes through an opening provided in the bottom located at the upper portion of the valve shaft holder 32 and is fixed to the push nut 33. The valve shaft 24 inserted into the hollow hole of the guide bush 26 is urged by a compression coil spring 34 in a direction in which the valve body 23 contacts the valve seat 22. At the upper end of the valve shaft 24, when the valve shaft 24 moves too much upward during operation and the fixing screw portion 25 and the moving screw portion 31 are disengaged, the moving screw portion 31 is moved to the fixing screw portion 25 side. An urging return spring 35 is provided.
[0008]
The can 40 has a bottomed cylindrical shape formed of a nonmagnetic metal such as stainless steel, and is fixed to a stainless steel flange 47 fixed to the upper portion of the valve body 20 by welding or the like, and the inside is airtight. It is kept in a state. The valve body 20 and the can 40 are electrically connected by a bowl-shaped plate 47.
[0009]
The stator 50 includes a yoke 51 made of a magnetic material, magnetic pole teeth 51 a provided on the yoke 40 side of the yoke 51, and upper and lower stator coils 53, 53 wound around the yoke 51 via a bobbin 52. A fitting hole 50 a that is molded by a molding material and is fitted on the can 40 is formed.
[0010]
A lower stopper piece 27a and an upper stopper piece 37a project from a fixed stopper 27 formed integrally with the guide bush 26 and a moving stopper 37 formed integrally with the valve shaft holder 32, respectively.
[0011]
A plurality of lead terminals 54 connected to the stator coil 53 protrude from the stator 50, and a connector 56 having a plurality of lead wires 55 connected thereto is connected to the lead terminals. A cover 57 covering the connector 56 is welded to the stator 50, and the inside of the cover 57 is filled with a filler 58 such as silicone resin or epoxy resin.
[0012]
The stator 50 has a fitting hole 50a having a lower surface opening at the center. The can 40 is fitted into the fitting hole, and is fixed to the valve main body 20 and the can 40 by a detent member 59 welded to the lower surface of the stator 50. Is done. The anti-rotation member 59 is fixed by crushing the protrusion 50b of the stator 50 with an ultrasonic welder or the like, and by holding the fluid outlet pipe 20b with the two arms of the anti-rotation member 59, the stator 50 It is fixed to the main body 20 and the can 40.
[0013]
Since such a stator 50 is molded by a molding material, the molding material usually contracts from the surface of the magnetic pole teeth 51a formed on the yoke 51 and is not in contact with the can. Alternatively, when the molding material is present on a part of the surface of the magnetic pole tooth 51a, a minute gap is generated between the magnetic pole tooth 51a and the can 40, and the two do not contact each other. If noise of several KV is applied to the stator coil 53 in such a state, a discharge may occur between the magnetic pole teeth 51a and the can 40. If a discharge occurs, the noise affects the peripheral circuits. May cause effects.
[0014]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-50415
[Problems to be Solved by the Invention]
The present invention has been made in view of such a problem, and an object of the present invention is to generate between a can and a stator due to noise while reducing the number of assembly parts and the number of assembly processes. An object of the present invention is to provide a motor-operated valve that suppresses discharge and reduces the influence of noise on peripheral circuits.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a motor-operated valve according to the present invention includes a valve body, a valve seat formed in the valve chamber, and a valve body having a valve body that adjusts the flow rate of refrigerant by contacting and separating from the valve seat. And a can with a built-in rotor that is fixedly attached to the valve body and contacts and separates the valve body from the valve seat, and the rotor is rotated through a yoke that is externally fitted to the can and is excited by energizing the coil. The stator including the coil and the yoke is molded by a molding material, is mounted on the molded stator, and engages with a piping member of the valve body. A conductive anti-rotation member for positioning and fixing the stator with respect to the can, and electrically connecting the yoke of the molded stator to the valve body. Assuming that the motor-operated valve is provided with a grounding member that is grounded, the grounding member is integrally formed with the stator by an insert mold in a state of being electrically connected to the yoke of the stator. a conductive fixing pins, and is characterized in that it is constituted by said conductive detent member coupled fixed to the conductive fixing pin.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a motor-operated valve according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a motor-operated valve according to a first embodiment of the invention preceding the present invention (hereinafter referred to as “prior invention”) . In the figure, the same components as those of the conventional motor-operated valve shown in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted. In the first embodiment, a conductive ring 61 made of, for example, brass is fitted on the outer periphery of the can 40, and the conductive ring 61 is brought into contact with the yoke 51 of the stator 50. As a result, the yoke 51 is connected to the valve body 20 via the conductive ring 61 and the can 40, so that even if a high voltage noise is applied to the stator coil 53, the discharge generated between the yoke 51 and the can 40 is prevented. Thus, the influence on the peripheral circuit can be reduced.
[0018]
The configuration of the motor-operated valve according to the second embodiment of the prior invention will be described with reference to FIG. In the figure, the same components as those of the conventional motor-operated valve shown in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted. In this embodiment, the valve body 20 and the yoke 51 are connected using a conductive resin 62. That is, in this embodiment, the anti-rotation member 59 that fixes the stator 50 to the can 40 so as not to rotate and the yoke 51 are connected using the conductive resin 62. Since the non-rotating member 59 is in contact with the fluid outlet pipe 20b attached to the valve body 20, the yoke 51, the can 40, and the like can be obtained even when high-voltage noise is applied to the stator coil 53, as in the first embodiment. The discharge generated during the period can be suppressed, and the influence on the peripheral circuit can be reduced.
[0019]
With reference to FIG. 3, illustrating the configuration of an electric valve according to implementation embodiments of the present invention. In the figure, the same components as those of the conventional motor-operated valve shown in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted. In this embodiment, the valve main body 20 and the yoke 51 are connected using a conductive fixing pin 63 and a conductive detent member 59 made of a conductive material. That is, in this embodiment, the conductive anti- rotation member 59 that fixes the stator 50 to the can 40 so as not to rotate and the yoke 51 are connected using, for example, a conductive fixing pin 63 made of brass. Since the conductive anti- rotation member 59 is in contact with the fluid outlet tube 20b, the discharge generated between the yoke 51 and the can 40 even when high-voltage noise is applied to the stator coil 53, as in the first embodiment. Can be suppressed, and the influence on the peripheral circuit can be reduced.
[0020]
As a method of providing the conductive fixing pin 63, at least the following two methods can be cited. One of them is that the stator 50 is molded with the conductive fixing pin 63 in contact with the yoke 51 in a state where the conductive fixing pin 63 is arranged, that is, is molded by so-called insert molding, so that the yoke 51 is in contact with the yoke 51. It is a method to mold into. The can 40 having the rotor 30 built therein and the valve body 20 fixed thereto is inserted into the fitting hole 50a of the stator 50 in which the conductive fixing pin 63 is insert-molded in this manner, and the fluid outlet pipe 20b of the valve body 20 is inserted. An opening 59 </ b> A provided in the conductive anti- rotation member 59 that comes into contact with is fixed to the conductive fixing pin 63 integrally formed with the stator 50. Thereafter, the conductive fixing pin 63 and the conductive anti- rotation member 59 are fixed by caulking the end portion of the conductive fixing pin 63. As a result, the yoke 51 and the valve body 20 are electrically connected through the path of the yoke 51 -the conductive fixing pin 63 -the conductive anti- rotation member 59 -the fluid outlet pipe 20b -the valve body 20 and the can 40 and the yoke 51 are connected. It is possible to prevent the discharge between.
[0021]
Then, other methods of providing a conductive fixing pins 63 operated valve according to an embodiment of the present invention FIG. 4 will be described with reference to FIG. In this method, the conductive fixing pin 63 is not molded integrally with the yoke 51 when the stator 50 is molded, but a hole 64 for inserting the conductive fixing pin is provided when the stator 50 is molded. In this method, the conductive fixing pin 63 is press-fitted into the fixing pin insertion hole 64 or is inserted and fixed by an ultrasonic insert. The stator 50 and the motor-operated valve 10 shown in FIGS. 4 and 5 have the same configuration as that shown in FIG. 6, and the same reference numerals indicate the same configuration, and thus the description thereof is omitted. As shown in FIG. 4, when the stator 50 is molded, a conductive fixing pin insertion hole 64 reaching the yoke 51 from the lower surface of the stator 50 is formed. By making the diameter of the stator insertion hole 64 smaller on the yoke 51 side, the inserted conductive fixing pin 63 is less likely to drop off.
[0022]
Next, the conductive fixing pin 63 is inserted into the conductive fixing pin insertion hole 64 until the tip contacts the yoke 51 and fixed to the stator 50. The can 40 having the rotor 30 built therein and the valve body 20 fixed to the lower portion is inserted into the fitting hole 50a of the stator 50 to which the conductive fixing pin 63 is fixed, and the conductive circumference contacting the fluid outlet pipe 20b of the valve body 20 is inserted. An opening 59 </ b> A provided in the stop member 59 is fitted into a conductive fixing pin 63 fixed to the stator 50. Thereafter, the conductive fixing pin 63 and the conductive anti- rotation member 59 are fixed by caulking the end portion of the conductive fixing pin 63. As a result, the yoke 51 and the valve body 20 are electrically connected through the path of the yoke 51 -the conductive fixing pin 63 -the conductive anti- rotation member 59 -the fluid outlet pipe 20b -the valve body 20 and the can 40 and the yoke 51 are connected. It is possible to prevent the discharge between.
[0023]
【The invention's effect】
As can be understood from the above description, the electric valve of the present invention, by using a conductive fixing pins and the conductive stopping member between the yoke and the valve body is electrically connected, high voltage noise to the stator coil There also is applied, the potential of the stator yoke is Rukoto is to the same potential as the potential of the can which is electrically connected to the valve body, the conductive ring in the first and second embodiment of the prior invention Ya Without requiring separate parts such as conductive resin, it is possible to suppress the occurrence of discharge between the stator and the yoke while reducing the number of assembly parts and the number of assembly processes, and the influence on the peripheral circuit can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view illustrating the structure of a motor operated valve according to a first embodiment of the prior invention.
FIG. 2 is a longitudinal sectional view for explaining the structure of an electric valve according to a second embodiment of the prior invention.
Longitudinal cross-sectional view for explaining the structure of the motor-operated valve in the implementation form of the invention, FIG.
Figure 4 is a longitudinal sectional view illustrating a manufacturing process of implementation according the electric valve in the form of the present invention (1).
Figure 5 is a longitudinal sectional view illustrating a manufacturing process of implementation according the electric valve in the form of the present invention (2).
FIG. 6 is a longitudinal sectional view for explaining the structure of a conventional motor-operated valve.

Claims (1)

A valve body having a valve body, a valve seat formed in the valve chamber, and a valve body that adjusts a flow rate of refrigerant through contact with and separating from the valve seat; and the valve body fixed to the valve body said containing and the can having a built-in rotor to contact released, is fitted to the scan, and with through yoke excited by energization of the coil and a stator for rotating said rotor, said coil and said yoke the stator is molded with a molding material, it is mounted on the mold molded the stator, and a conductive detent for positioning and fixing the piping member engaged with the stator of the valve body relative to the can has a member in the mold the yoke molded with which the stator electrically connected to thereby relative to the valve body formed by including a ground member for grounding the electric valve,
The grounding member includes a conductive fixing pin integrally formed with the stator by an insert mold in a state where the grounding member is electrically connected to the yoke of the stator, and the conductive detent connected and fixed to the conductive fixing pin. electric valve, characterized in that it is constituted by the member.

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