JP4895532B2 - Motorized valve - Google Patents

Description

  The present invention relates to an electric valve used by being incorporated in an air conditioner, a refrigerator, or the like, and in particular, high coaxiality can be ensured for rotating system components (rotor, valve body, can, valve shaft, guide member, etc.). In addition, the present invention relates to a motor-operated valve that can reduce frictional resistance generated between them as much as possible.

  As an electric valve used by being incorporated in an air conditioner, a refrigerator, or the like, for example, as seen in the following Patent Document 1 or the like, a valve shaft having a valve body and a valve having a valve seat on which the valve body contacts and separates A main body, a can joined to the valve main body, a rotor disposed on the inner periphery of the can, a stator disposed on the outer periphery of the can for rotationally driving the rotor, and held and fixed to the valve main body. A guide member having a cylindrical portion that guides the valve shaft, and a screw feed mechanism that is disposed between the rotor and the valve body and contacts and separates the valve body from the valve seat using the rotation of the rotor. Is known.

  In this electric valve, the screw feed mechanism includes a fixed screw portion formed on the outer periphery of the guide member, and a movable screw portion formed on the inner periphery of the valve shaft holder disposed on the outer periphery of the valve shaft and the guide member. It is configured.

In addition, as another electric valve, a valve shaft is connected to a rotor so as to be integrally rotatable and integrally movable, and the valve shaft and the valve body are separated from each other, for example, as shown in Patent Document 2 below. Known to. In this type of electric valve, for example, a cylindrical valve holder is attached to the lower part of the valve shaft, and a separate valve body (upper part) is moved relative to the valve shaft in the axial direction and relative to the valve shaft. A screw feed mechanism that is inserted in a rotatable state and locked to prevent the valve body from contacting and separating from the valve seat is formed, for example, on the inner periphery of a female screw member attached to the guide member. And a movable screw portion formed on the outer periphery of the valve shaft.
In addition, the applicant of the present invention aims to simplify the structure of a member such as a stem for fixing the valve main body and the female screw member to the valve main body side, and to provide an electric valve that can ensure the coaxiality of the member at the time of assembly. Patent application 3 has been filed.
JP 2001-50415 A JP 2003-329158 A Japanese Patent Application No. 2004-272293

In this type of electric valve, a rotor, a valve shaft, a valve holder, a valve body that moves in the axial direction with rotation, a valve seat that is a member on the fixed side, a screw member on the fixed side, and a stem that supports the screw member And the like require simplification of configuration and accuracy of coaxiality at the time of assembly.
An object of the present invention is to provide a motor-operated valve that satisfies the above-described requirements.

To achieve the above object, the electric valve of the present invention includes a valve body member having a valve seat member, and the can is cylindrical pressure vessel which is equipped with the valve body member, fitted to the outside of the scan A stator member of the motor, a rotor member rotatably provided inside the can, a male screw member that moves up and down integrally with the rotor member, and the valve main body member fixed to the male screw member A screw mechanism comprising a fixed female screw member to be screwed, a fixed-side spiral member for regulating the amount of rotation of the rotor member, and a rotor member rotation amount regulating means comprising a moving-side spiral member to be screwed therewith, on the assumption that the electrically operated valve that the rotational movement and such that opening and closing the valve body is converted into reciprocating motion by the screw mechanism of the rotor member, the valve body member is of a large diameter by pressing Lower end opening The valve than the body portion and the valve body portion is a single component and the stem portion is formed on one body having an upper end opening of small diameter, said the lower end opening of the valve body portion of the large diameter disk-shaped having together with the valve seat member having a shape is fixed, the upper end opening portion of the small diameter stem portion, said has the fixing female screw member of the screw mechanism is fixed to the outer periphery of the small diameter stem portion, The rotor member rotation amount regulating means is fitted and disposed, and the valve body that is in contact with and separated from the valve opening of the valve seat member is supported via a valve holder at the lower end of the male screw member of the screw mechanism. The holder is slidably guided within the small-diameter stem portion.
Preferably, the disc-shaped valve seat member fixed to the opening of the large-diameter valve body portion has a wax flow groove formed on a peripheral wall surface of the valve seat member, and the large-diameter valve body portion It is characterized by being fixed to the lower end opening of the brazing by brazing . In addition, the pipe fixed to the side wall of the large-diameter valve main body and the valve seat member has a dimple projecting radially in the tube wall corresponding to the fixed portion. And

FIG. 1 is a cross-sectional view of the motor-operated valve of the present invention with the stator unit removed.
Electric valve 1 has a larger diameter of the valve body portion 10 which is a pipe-shaped material is manufactured by press working or the like, therewith and a stem portion 20 of small diameter is formed coaxially. A valve seat member 30 is press-fitted into the open end of the large-diameter valve body 10 and is fixed by a joining means such as brazing.
The inside of the large-diameter valve body 10 forms a valve chamber 12, and a valve opening 31 is provided at the center of the valve seat member 30.

The valve seat member 30 is a disk-shaped member, and is positioned at the opening end of the large-diameter valve body 10 by the flange portion 32. On the side wall of the valve seat member 30 is formed with a groove 36 to enhance the brazing strength flows brazing the groove 36 when brazing the valve seat member 30 to the valve body portion 10.

The end face of the valve chamber 12 side of the valve seat member 30, stepped portions 34 are provided. The side surface of the large diameter of the valve body portion 10, although one of the pipe 40 for inlet and outlet of refrigerant is inserted and fixed, stepped portion 34 regulates the position of the tip of the pipe 40. A dimple 40a is provided at a position where it abuts against the side wall of the valve body 10 of the pipe 40 to ensure the joining.

A dimple 42 a similar to the dimple 40 a of the pipe 40 is also formed on the other pipe 42 joined to the valve seat member 30.
The valve body 10 is integrally connected to the small-diameter stem portion 20 via the step portion 14 and the flat portion 16.

An opening of a can 50 that is a pressure vessel is brought into contact with the stepped portion 14 on the outer periphery of the large-diameter valve body 10 and is fixed by welding means.
The fixed female screw member 80 is attached to the open end of the small diameter of the stem portion 20. The solid female constant screw member 80 has a female screw portion 82.

A rotor member 60 is disposed inside the can 50 and is rotationally driven by an excitation signal from a stator portion (not shown). The rotor member 60 is integrally connected to the male screw member 70 via the connecting member 66.
The male screw member 70 has a male screw portion 72 and is screwed into the female screw 82 of the fixed female screw member 80. The male screw shaft 70 has a large-diameter flange portion 75 at its end on the valve chamber 12 side, and is slidably guided to the inner diameter portion of the small-diameter stem portion 20.

Groove portion 74 provided adjacent to the flange portion 75 of the male screw member 70, a pipe-shaped valve holder 90 is secured. The outer diameter portion of the valve holder 90 is slidably guided to the inner diameter portion of the small-diameter stem portion 20. The valve body 100 is supported at the end of the valve holder 90 on the valve seat member 30 side via the support member 102.

Ball 110 is inserted into the lower end portion of the valve holder 90, the spring 112 is disposed between the male screw member 70. The spring 112 generates a spring force in a direction in which the valve body 100 is pressed toward the valve seat member 30 via the ball 110.

A fixed-side spiral member 130 for restricting the amount of rotation of the rotor member 60 is fitted to the outside of the small-diameter stem portion 20. Bending portions 134 and 132 are provided on the upper end side and the lower end side of the fixed-side spiral member 130 , respectively, and the bending portion 134 on the upper end side is a protruding portion that extends in the axial direction at the inner cylinder portion of the rotor member 60. The bent portion 132 that is bent upward without engaging 62 is inserted into and fixed to the hole 18 provided in the flat portion 16 of the large-diameter valve body 10.
The moving-side spiral member 140 screwed into the fixed-side spiral member 130 has a protruding end 142 on the upper end side, and the protruding end 142 is provided on the inner diameter portion of the rotor member 60 and extends in the axial direction of the rotor. Engage with the protrusion 62.

When the rotor member 60 is rotated, the male screw shaft 70 is fed in the axial direction by fixing the female screw member 80.
With the axial movement of the male screw shaft 70, the rotor member 60 also moves up and down while rotating. The moving-side spiral member 140 rotates with the rotor member 60 and is guided by the fixed-side spiral member 130.
By appropriately setting the number of turns of the fixed-side spiral member 130, the amount of rotation of the rotor member 60 can be appropriately regulated.
Vertical movement of the male screw shaft 70 is transmitted to the valve body 100 via the valve holder 90. The valve body 100 is separated from the valve opening 31 according to the rotation amount of the rotor member 60, and controls the flow rate of the refrigerant.

As described above, the motor-operated valve according to the present invention has a valve body member, which is a main part of the motor-operated valve , formed of a single body in which a large-diameter valve body portion and a stem portion having a smaller diameter than the valve body portion are integrally formed by pressing. Since it is a single part, it is possible to provide a motorized valve that is excellent in terms of ease of machining, processing and assembly of the part with other parts, and low cost of parts, and a valve chamber. The large-diameter valve body that forms the valve body and the small-diameter stem portion that slidably guides the valve holder that supports the valve body and attaches the fixed female screw member are configured as a single member. This can reduce the simplification of the entire structure of the motor-operated valve. In addition, the coaxiality is improved, and the coaxiality between the valve body and the valve opening is also improved. Therefore, the opening / closing operation of the valve is also facilitated.

Sectional drawing of the motor operated valve of this invention.

DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Large diameter valve main-body part 12 Valve chamber 20 Small diameter stem part 30 Valve seat member 31 Valve opening 36 Wax flow groove 40 Piping 40a Dimple 42 Piping 42a Dimple 50 Can 60 Rotor member 70 Male screw member 80 Fixed female screw member 90 Valve holder 100 Valve body 110 Ball 112 Spring

Claims (3)

A valve body member having a valve seat member, and the can is cylindrical pressure vessel which is equipped with the valve body member, a stator member of a motor that is fitted to the outside of the scan, rotatably on the inside of the can A rotor member equipped with the screw member, a male screw member that moves up and down integrally with the rotor member, a screw mechanism that is fixed to the valve body member and screwed into the male screw member, and the rotor member and a rotor member rotating amount regulating means comprising movable spiral member for fixing side spiral member and screwed therewith for regulating the amount of rotation, to convert the rotational motion of the rotor member in the forward and backward motion by the screw mechanism In the motorized valve that opens and closes the valve body,
The valve body member is a single part and the stem portion is formed on one body having a small-diameter upper end opening than the valve body portion and the valve body having a lower end opening portion of the large diameter by pressing A valve seat member having a disk shape is fixed to the lower end opening of the large-diameter valve body , and the fixed female screw member of the screw mechanism is attached to the upper end opening of the small-diameter stem. There are fixed, on the outer periphery of the small diameter stem portion, said rotor member rotating amount regulating means is fitted provided, at the lower end of the male screw member of the screw mechanism, a valve opening of the valve seat member The motor-operated valve characterized in that the contacting and separating valve body is supported via a valve holder, and the valve holder is slidably guided in the small-diameter stem portion. The disc-shaped valve seat member fixed to the opening portion of the large-diameter valve body portion has a wax flow groove formed on a peripheral wall surface of the valve seat member, and a lower end opening of the large-diameter valve body portion. The motor-operated valve according to claim 1, wherein the motor-operated valve is fixed to the portion by brazing . The pipe fixed to the side wall of the large-diameter valve main body and the valve seat member has a dimple projecting in the radial direction on the tube wall corresponding to the fixed portion. 1. The motor operated valve according to 1.

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