KR20040086172A - Motor Operated Valve - Google Patents

Abstract

PURPOSE: A motor valve is provided to make the potential of a yoke of a stator same as the potential of a can electrically coupled with a valve body even if high-voltage noise is applied on a stator coil by electrically coupling between the yoke and the valve body and to repress electric discharge between the can and the stator. CONSTITUTION: A motor valve(10) is composed of a valve body unit(20) for controlling the flow passing to a valve body(23) combined to a valve seat(22) in a valve chamber(21) by a valve shaft(24); a can(40) fastened on the valve body to embed a rotor(30) for combining the valve body to the valve seat; and a stator(50) wound around the outside of the can to rotate and drive the rotor. The valve body and the yoke are electrically coupled by installing an electroconductive fixing pin(63) contacting with the yoke in a mold unit of the stator and caulking and fastening a fixing member(59) to the electroconductive fixing pin.

Description

Motor Operated Valve

The present invention relates to an electric valve used in an air conditioner, a refrigerator or the like. In particular, it is related with the electric valve which removes discharge between the pole tooth of a step motor and the can which accommodated the rotor.

BACKGROUND ART Conventionally, electric valves incorporated in such air conditioners, refrigerators, and the like are devices for adjusting the flow rate of a fluid such as a refrigerant, and are usually provided with a valve body and a valve seat having a valve chamber and a valve seat, through the upper flange and the valve. It has a cylindrical can with a base fixed to the upper part of the main body, and a rotor is built into the inside of the can, and a stator having an insertion hole in the center of the can is externalized (for example, Japanese Patent Application Laid-Open No. 2001-20415). Korean Patent Publication No. 1, the following patent document 1).

The structure of the conventional electric valve shown in patent document 1 is demonstrated using sectional drawing of FIG. 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 step motor.

The valve body 20 made of brass is a means for adjusting the flow rate of the refrigerant, and includes a valve seat 22 in which the valve chamber 21 and the valve body 23 are folded. A brass guide bush 26 on which the flange top plate 47 made of brass and the fixing stopper 27 made of plastic is fixedly supported is fixed to the valve body 20. The guide bush 26 is formed in the shape of a hollow cylinder, and the screw thread 25a is fixed to the upper part of the outer circumferential surface thereof and the fixing stopper 27 made of plastic is formed by injection molding at the lower part thereof. In the middle portion of the both sides, a pressure equalizing hole 32a is provided to equalize the pressure in the space in the valve chamber 21 and the can 40, and the valve made of brass having the valve body 23 formed at the front end thereof in the hollow hole. The shaft 24 is slidably inserted. The outer circumference of the flange upper plate 47 supports and fixes the lower opening of the can 40. The fluid introduction pipe 20a is connected to the lower part of the valve seat 22, and the fluid discharge pipe 20b is connected and fixed to the valve chamber 21. As shown in FIG.

The rotor 30 is formed from, for example, a magnetized magnet and has a cylindrical shape, and the valve shaft holder 32 is inserted into and fixed to the hollow hole through a moving stopper 37 made of plastic. The valve shaft holder 32 is formed in a cylindrical shape with a bottom using yellow steel, a moving screw portion 31 is formed on the inner circumferential wall thereof, and a spiral groove part 32b is formed on the outer circumferential wall thereof. A plastic stopper 37 is fixed to the spiral groove portion 32b by injection molding. The support ring 36 fixed to the rotor 30 is supported and fixed to the valve shaft holder 32 by caulking the upper passage of the valve shaft holder 32, and the rotor 30 and the valve shaft holder 32 are Are integrated.

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. Combine to form a screw feed mechanism.

The upper end of the valve shaft 24 inserted into the hollow hole of the guide bush 26 is fixed to the push nut 33 through the opening provided in the bottom located above the valve shaft holder 32. The valve shaft 24 inserted into the hollow hole of the guide bush 26 is urged in the direction in which the valve body 23 is in contact with the valve seat 22 by the compression coil spring 34. In the upper end of the valve shaft 24, when the valve shaft 24 moves too far in the upper part during operation, and the screwing of the fixing screw 25 and the moving screw 31 is missed, the moving screw 31 is fixed to the fixing screw ( The return spring 35 which is biased on the 25) side is provided.

The can 40 has a bottomed cylindrical shape formed of a nonmagnetic metal such as stainless steel, and is fixed to the flange top plate 47 made of stainless steel fixed to the upper portion of the valve body 20 by welding or the like, and the inside is hermetically sealed. Is maintained. The valve body 20 and the can 40 are electrically connected by the flanged upper plate 47.

The stator 50 is wound around the yoke 51 made of a magnetic material, the magnetic pole teeth 51a provided on the can 40 side of the yoke 51, and the bobbin 52 through the yoke 51. The upper and lower stator coils 53 and 53 are formed, and a fitting hole 50a is formed by a mold material and externally wound on the can 40.

The lower stopper piece 27a and the upper stopper piece 37a protrude from the fixed stopper 27 formed integrally with the guide bush 26 and the moving stopper 37 formed integrally with the valve shaft holder 32, respectively. do.

A plurality of lead terminals 54 connected to the stator coil 53 protrude from the stator 50, and a connector 56 to which the plurality of lead wires 55 are connected is connected to the lead terminals. The cover 57 covering the connector 56 is welded to the stator 50, and the cover 57 is filled with a filler 58 such as a silicone resin or an epoxy resin.

The stator 50 has a fitting hole 50a at the center thereof, and the valve body 20 is formed by a rotation fixing member 59 fitting the can 40 to the fitting hole and welded to the lower surface of the stator 50. And can 40. The rotation fixing member 59 is fixed by pressing and holding the projection 50b of the stator 50 by an ultrasonic welder or the like, and holding the fluid discharge pipe 20b by the two extensions of the rotation fixing member 59. As a result, the stator 50 is fixed to the valve body 20 and the can 40.

Since the stator 50 is molded by the mold material, the mold material is generally contracted from the surface of the magnetic pole teeth 51a formed on the yoke 51 and is not in contact with the can 40. Or when a mold material exists in a part of the surface of the magnetic pole tooth 51a, a minute space | interval arises between the magnetic pole tooth 51a and the can 40, and the state which both of them do not contact arises. When 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. Therefore, when discharge occurs, the noise may affect the peripheral circuit. There is.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide an electric valve which suppresses discharge generated between the can and the stator due to noise and reduces the influence of noise on the peripheral circuit. Another object of the present invention is to provide an electric valve capable of reliably conducting between both parts even if the distance between the stator and the valve body or the rotation stop is large or small.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view explaining the structure of the electric valve concerning a 1st Example of this invention.

2 is a longitudinal cross-sectional view for explaining the structure of an electric valve according to a second embodiment of the present invention.

3 is a longitudinal cross-sectional view for explaining the structure of an electric valve according to a third embodiment of the present invention.

4 is a longitudinal cross-sectional view illustrating the structure of a conventional electric valve.

Fig. 5 is a longitudinal sectional view (1) illustrating a manufacturing process of the electric valve according to the third embodiment of the present invention.

Fig. 6 is a longitudinal sectional view (2) illustrating a manufacturing process of the electric valve according to the third embodiment of the present invention.

7 is a longitudinal cross-sectional view for explaining the structure of an electric valve according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of a main part of FIG. 7; FIG.

9 is a bottom view of the main part of FIG. 7;

10 is an exploded view of FIG. 8;

<Description of the code | symbol about the principal part of drawing>

10: electric valve 20: valve body

20b: fluid outlet pipe 21: valve chamber

22: valve seat # 23: valve body

24: valve shaft 24a: slit

25: fixing screw part 26: guide bush

27: stopper 30: rotor

31: moving screw part 32: valve shaft holder

33: Push nut 34: Compression coil spring

35 return spring 36 support ring

37: upper stopper 40: can

50: stator 59: rotation fixing member

59a: Mounting hole 59b: Fixing hole

60: conductive elastomer (conductive spring) 61: conductive ring

62: conductive resin 63: conductive fixing pin

64: conductive fixing pin insertion hole

MEANS TO SOLVE THE PROBLEM In order to achieve the said technical subject, the electric valve which concerns on this invention is a valve body which adjusts a flow volume to a valve body which is folded by the valve shaft to the valve seat in a valve chamber, and is fixed to the valve body, and the said valve body is a valve seat. An electric valve having a can incorporating a rotor to be folded into a rotor and a stator that is wound around the can and rotates the rotor, wherein the valve body and the yoke constituting the stator are electrically connected. In addition, the present invention is provided as a means for electrically connecting the valve body and the yoke, and is provided between a ring made of metal contacting the yoke at the same time as the can, and a rotation fixing member electrically connected to the valve body and the yoke. One end of the conductive resin or the rotary fixing member electrically connected to the valve body is a pin in contact with the yoke.

Furthermore, in the electric valve provided with the stator which is wound around the said can and drives the rotation of the rotor, the rotation fixing member and the yoke which electrically connect the valve main body and the yoke which comprises the stator are electrically connected with the valve main body. It is a conductive elastic material provided between and it is characterized by the above-mentioned. In addition, the conductive elastic material is a coil spring.

Embodiment of the Invention

(First embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, the Example of the electric valve which concerns on this invention is described in detail based on drawing. 1 is a longitudinal sectional view of an electric valve according to a first embodiment of the present invention. In the same figure, the same code | symbol is attached | subjected about the component same as the conventional electric valve shown in FIG. 4, and the description is abbreviate | omitted. In the first embodiment, the conductive ring 61 is brought into contact with the yoke 51 of the stator 50 by subtracting the conductive, for example, brass conductive ring 61 from the outer periphery of the can 40. As a result, the yoke 51 is connected to the valve body 20 via the conductive ring 61 and the can 40, so that the yoke 51 and the can 40 can be applied even if a high voltage noise is applied to the stator coil 53. Discharges generated between and can be suppressed, and the influence on the peripheral circuit can be reduced.

(2nd Example)

2, the structure of the electric valve concerning a 2nd Example of this invention is demonstrated. In the figure, the same code | symbol is attached | subjected about the component same as the conventional electric valve shown in FIG. 4, and the description is abbreviate | omitted. This embodiment is configured by connecting the valve body 20 and the yoke 51 with the conductive resin 62. That is, in this embodiment, the rotation fixing member 59 and the yoke 51 which fix the stator 50 to the can 40 so as not to rotate are connected using the conductive resin 62. Since the rotation fixing member 59 is in contact with the fluid discharge pipe 20b provided in the valve main body 20, the yoke 51 and the can (even if high voltage noise is applied to the stator coil 53 as in the first embodiment). The discharge generated between 40 and 40 can be suppressed and the influence on the peripheral circuit can be reduced.

(Third Embodiment)

3, the structure of the electric valve concerning a 3rd Example of this invention is demonstrated. In the figure, the same code | symbol is attached | subjected about the component same as the conventional electric valve shown in FIG. 4, and the description is abbreviate | omitted. This embodiment is constructed by connecting between the valve body 20 and the yoke 51 by using a conductive fixing pin 63 made of a conductive material. That is, in this embodiment, the rotation fixing member 59 and the yoke 51 for fixing the stator 50 to the can 40 without rotation are connected by using, for example, a conductive fixing pin 63 made of brass. do. Since the rotation fixing member 59 is in contact with the fluid lead-out tube 20b, the noise between the yoke 51 and the can 40 is generated even when high voltage noise is applied to the stator coil 53 as in the first embodiment. Since the discharge can be suppressed, the influence on the peripheral circuit can be reduced.

As a method of providing the said electroconductive fixing pin 63, the following two methods can be mentioned. One of them is formed in the yoke 51 by molding with a so-called insert mold which mold-forms the stator 50 in a state in which the conductive fixing pin 63 is in contact with the yoke 51 and the conductive fixing pin 63 is disposed. It is a method of forming in contact with one another. In this way, the can 40 having the valve body 20 fixed therein is inserted by inserting the rotor 30 into the fitting hole 50a of the stator 50 into which the conductive fixing pin 63 is inserted and molded. The passage 59A provided in the rotation fixing member 59 in contact with the fluid discharge pipe 20b of the main body 20 is wound around the conductive fixing pin 63 integrally formed with the stator 50. Thereafter, the ends of the conductive pins 63 are applied to fix the conductive pins 63 and the fixing member 59. As a result, the yoke 51 and the valve body 20 are electrically connected to each other by the path of the yoke 51, the conductive fixing pin 63, the rotation fixing member 59, the fluid discharge pipe 20b, and the valve body 20. Can be prevented from being discharged between the can 40 and the yoke 51.

Next, another method of providing the conductive fixing pin 63 with respect to the electric valve according to the third embodiment will be described with reference to FIGS. 5 and 6. This method does not integrally shape the conductive fixing pin 63 with the yoke 51 when the stator 50 is molded, but instead inserts the hole 64 for inserting the conductive fixing pin at the time of mold molding of the stator 50. ), And the conductive fixing pin 63 is press-fitted into the conductive fixing pin insertion hole 64 or inserted into and fixed by an ultrasonic insert. Since the stator 50 and the electric valve 10 shown to FIG. 5, FIG. 6 have the structure as shown in FIG. 3, and the same code | symbol shows the same structure, the description is abbreviate | omitted. As shown in FIG. 5, when the stator 50 is molded, a conductive fixing pin insertion hole 64 extending from the lower surface of the stator 50 to the yoke 51 is formed. By making the diameter of the stator insertion hole 64 smaller on the yoke 51 side, the inserted conductive fixing pin 63 becomes difficult to fall off.

Next, the conductive fixing pin 63 is inserted into the conductive fixing pin insertion hole 64 and fixed to the stator 50 until the tip contacts the yoke 51. The rotor 30 is built into the fitting hole 50a of the stator 50 to which the conductive fixing pin 63 is fixed, and a can 40 having the valve body 20 fixed therein is inserted thereinto, and the fluid of the valve body 20 is inserted. The passage 59A provided in the rotation fixing member 59 in contact with the lead pipe 20b is fitted to the conductive fixing pin 63 fixed to the stator 50. Thereafter, the ends of the conductive pins 63 are applied to fix the conductive pins 63 and the fixing member 59. As a result, the valve body 20 is electrically connected to the yoke 51 in the path of the yoke 51, the conductive fixing pin 63, the rotation fixing member 59, the fluid discharge pipe 20b, and the valve body 20. Can be connected to the can 40 to prevent discharge between the yoke 51.

(Example 4)

EMBODIMENT OF THE INVENTION Hereinafter, the 4th Example of the electric valve concerning this invention is described in detail based on drawing. 7 is a longitudinal cross-sectional view illustrating the electric valve according to the embodiment of the present invention, FIG. 8 is an explanatory view of the main part of FIG. 7, FIG. 9 is a bottom view of the main part of FIG. 7, and FIG. 10 is an exploded view of FIG. 8. In the said drawings, the same code | symbol is attached | subjected about the component same as the conventional electric valve shown in FIG. 4, and the description is abbreviate | omitted.

(Conductive Elastic 60)

The fourth embodiment is configured by connecting the valve body 20 and the yoke 51 with the conductive spring 60. That is, in this fourth embodiment, the rotation fixing member 59 and the yoke 51 for fixing the stator 50 to the can 40 without rotation are connected by using a spring which is the conductive elastic body 60.

Since the rotation fixing member 59 is in contact with the fluid lead-out pipe 20b provided in the valve body 20, even if high voltage noise is applied to the stator coil 53, the rotation fixing member 59 is generated between the yoke 51 and the can 40. Since the discharge can be suppressed, the influence on the peripheral circuit can be reduced.

As the means for installing the conductive spring 60, a hole 51b having a predetermined diameter is drilled and installed in the lower surface of the yoke 51, and at the same time, two fixing holes are formed on the surface of the rotation fixing member 59. Together with 59b), a mounting hole 59a of a predetermined depth and diameter is drilled and installed. In addition, although the conductive spring 60 uses the coil-shaped conductive spring 60 with the diameter size as much as the upper part (the yoke 51 side) to a predetermined length, it is not limited to this, It is possible if it is a metallic material which has elasticity electroconductively. .

To mount the conductive spring 60 between the yoke 51 and the fixing member 59, when the fixing member 59 is fixed to the stator 50 by the fixing hole 59b using ultrasonic welding, The conductive spring 60 may be disposed only between the mounting hole 59a and the fitted hole 51b. At this time, the conductive spring 60 is reduced and fitted into the rotary fixing member 59 regardless of the magnitude of the distance from the yoke 51. In this state, the rotation fixing member 59 and the yoke 51 are brought into a conductive state through the conductive spring 60.

Thereafter, by mounting the stator 50 on which the conductive spring 60 is mounted, to the valve body 20, the yoke 51 and the valve body 20 are surely in a conductive state through the rotation fixing member 59. Realization and storage will be maintained.

As described above, the electric valve of the present invention is electrically connected between the yoke and the valve body, so that the potential of the yoke of the stator can be electrically connected to the valve body even when high voltage noise is applied to the stator coil. Since it becomes coin-top and it can suppress that a discharge generate | occur | produces between them, the influence to a peripheral circuit can be reduced. In addition, the conductive elastic material provided between the rotation fixing member electrically connected to the valve body and the yoke, in particular, the coil spring, can be reliably challenged even if there is a variation in the distance between the rotation fixing member and the yoke. It works.

Claims (8)

A canister having a valve body for adjusting a passage flow rate by a valve body folded by a valve shaft in a valve seat in a valve chamber, a rotor fixed to the valve body and folding the valve body on a valve seat, An electric valve comprising a stator for rotating the rotor, wherein the yoke constituting the valve body and the stator are electrically connected. The method of claim 1, And a means for electrically connecting the valve body and the yoke is a metal ring which is external to the can and is in contact with the yoke at the same time. The method of claim 1, And a means for electrically connecting the valve body and the yoke is a conductive resin provided between the rotation fixing member electrically connected to the valve body and the yoke. The method of claim 1, And a means for electrically connecting the valve body and the yoke is a conductive fixing pin having one end for fixing the rotation fixing member electrically connected to the valve body in contact with the yoke. The method of claim 4, wherein And the conductive fixing pin is integrally molded to the stator by an insert mold, and the rotation fixing member is fixed to the conductive fixing pin by caulking. The method of claim 4, wherein The electroconductive fixing pin is inserted into the conductive fixing pin insertion hole leading to the yoke formed when the stator is molded and integrated with the stator, and the rotary fixing member is fixed to the conductive fixing pin by caulking. . The method of claim 1, And a means for electrically connecting the yoke constituting the valve body and the stator is a conductive elastic material provided between the yoke constituting the valve body and the yoke that is electrically connected to the valve body. The method of claim 7, wherein The electrically conductive valve is a coil spring.