KR101055516B1 - Motorized valve - Google Patents

Abstract

The present invention electrically connects the yoke and the valve body by using a conductive fixing pin and a conductive rotation fixing member, 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. Because of the potential and coincidence, the parts between the stator and the yoke can be reduced while eliminating the need for separate parts such as conductive rings or conductive resins according to the first and second embodiments of the present invention. The present invention relates to an electric valve capable of preventing a discharge from occurring and reducing an influence on a peripheral circuit.

Description

Motor Operated Valve

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

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

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

7 is a longitudinal cross-sectional view for explaining the structure of an electric valve according to a second 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 Related Art

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: conductive 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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor operated valve installed and used in an air conditioner, a refrigerator, and the like, and more particularly, to an electric valve that eliminates discharge between a magnetic pole tooth of a stepper motor and a can containing a rotor.

BACKGROUND ART Conventionally, electric valves installed and used in an air conditioner or a refrigerator of this kind are devices for adjusting the flow rate of a fluid such as a refrigerant, and are usually provided through a valve body having a valve chamber and a valve seat, and an upper portion of the flange through the valve body. It has a cylindrical can of an open bottom coupled to an upper portion of the can, and a rotor is built into the inside of the can so that 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 part of the valve, a pressure equalizing hole 32a for equalizing the pressure of the space in the valve chamber 21 and the can 40 is provided, and the valve made of brass having the valve body 23 formed at the front end 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.

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 fixed screw part 25 and the moving screw part 31 misses, the moving screw part 31 is fixed to the fixed screw part ( 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 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.

In order to achieve the above technical problem, the electric valve according to the present invention is attached to the valve chamber 21, the valve seat 22 formed in the valve chamber 21, and the valve seat 22 to be passed through the refrigerant flow rate. A valve body 20 having a valve body 23 for adjusting the pressure, and a rotor 30 coupled to the valve body 20 and detaching the valve body 23 to the valve seat 22. The can 40 and the stator 50 coupled to the outside of the can 40 and inserted into the yoke 51 which generates magnetic force by energization of the coil are rotated to drive the rotor 30. The stator 50 including the coil and the yoke 51 is molded by a mold material, mounted on the mold-shaped stator 50, and coupled with a piping member of the valve body 20 to the stator 50. ) Is provided with a conductive rotation fixing member (59) for positioning and fixing with respect to the can (40). In the motor-driven valve, which is provided with a grounding member for electrically connecting to the ground with respect to the yoke 51 of the molded stator 50 to the valve body 20,
The grounding member is electrically connected to the yoke 51 of the stator 50 and has a conductive fixing pin 63 integrally formed on the stator 50 by an insert mold, and the conductive fixing pin 63. It is characterized by consisting of the conductive rotation fixing member 59 fixed to the coupling.

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EMBODIMENT OF THE INVENTION Hereinafter, the Example of the electric valve which concerns on this invention is described in detail based on drawing. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view of an electric valve according to a first embodiment of the invention (hereinafter referred to as 'prior invention') prior to 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 coupling the conductive ring 61 made of conductive, for example, brass, to the outer circumference 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.

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2, the structure of the electric valve concerning a 2nd Example of prior 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 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.

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3, the structure of the electric valve concerning a 1st 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 to connect between the valve body 20 and the yoke 51 by using a conductive fixing pin 63 made of a conductive material and a conductive rotation fixing member 59. That is, in this embodiment, the conductive rotation fixing member 59 and the yoke 51 for fixing the stator 50 to the can 40 without rotation, for example, using a conductive fixing pin 63 made of brass. Connect. Since the conductive rotation fixing member 59 is in contact with the fluid lead-out pipe 20b, the yoke 51 and the can 40 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. Since the generated 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 conductive 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 fixing pin 63 are applied to fix the conductive fixing pin 63 and the conductive rotation fixing member 59. As a result, the yoke 51 and the valve body 20 are routed through the yoke 51, the conductive fixing pin 63, the conductive rotation fixing member 59, the fluid discharge pipe 20b, and the valve body 20. It is electrically connected, and the discharge between the can 40 and the yoke 51 can be prevented.

Next, another method of providing the conductive fixing pin 63 with respect to the electric valve according to the embodiment of the present invention will be described with reference to FIGS. 5 and 6. In this method, the conductive fixing pin 63 is not integrally molded with the yoke 51 when the stator 50 is molded, but the conductive fixing pin insertion hole 64 is formed when the stator 50 is molded. And a conductive fixing pin 63 are press-fitted into the conductive fixing pin insertion hole 64 to be inserted 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 conductive fixing pin 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 conductive 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 fixing pin 63 are applied to fix the conductive fixing pin 63 and the conductive rotation fixing member 59. As a result, the valve main body 20 moves from the yoke 51 to the conductive fixing pin 63 to the conductive rotation fixing member 59 to the fluid discharge pipe 20b to the yoke 51 in the path of the valve main body 20. Electrically connected, the can 40 can prevent discharge between the yoke 51.

(Example 4)

EMBODIMENT OF THE INVENTION Hereinafter, the 2nd Example of the electric valve concerning this invention is described in detail based on drawing. FIG. 7 is a longitudinal sectional view for explaining the electric valve according to the second 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 second embodiment is constructed by connecting the valve body 20 and the yoke 51 with the conductive elastic body 60. That is, in this second embodiment, the conductive 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 conductive 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, between the yoke 51 and the can 40. Since the generated discharge can be suppressed, the influence on the peripheral circuit can be reduced.

As a means for providing the conductive elastic body 60, a hole 51b having a predetermined diameter is drilled in the lower surface of the yoke 51, and at the same time, two fixing holes are provided on the surface of the conductive rotation fixing member 59. Together with 59b, a mounting hole 59a of a predetermined depth and diameter is drilled and provided. In addition, although the conductive elastic body 60 uses the coil-shaped conductive elastic body 60 in diameter 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 electrically. .

In order to mount the conductive elastic body 60 between the yoke 51 and the fixing member 59, the conductive rotating fixing member 59 is fixed to the stator 50 by the fixing hole 59b using ultrasonic welding. At this time, the conductive elastic body 60 may be disposed only between the mounting hole 59a and the fitted hole 51b. At this time, the conductive elastic body 60 is reduced and fitted into the conductive rotation fixing member 59 regardless of the distance from the yoke 51. In this state, the conductive rotation fixing member 59 and the yoke 51 enter the conductive state by inserting the conductive elastic body 60.

Thereafter, by mounting the stator 50 on which the conductive elastic body 60 has been attached to the valve body 20, the conductive rotation fixing member 59 is inserted to ensure that the yoke 51 and the valve body 20 are in a conductive state. Is realized and stored.

As described above, the electric valve of the present invention electrically connects the yoke and the valve body by using a conductive fixing pin and a conductive rotation fixing member, so that the potential of the yoke of the stator can be maintained even when high voltage noise is applied to the stator coil. Since the potential of the can electrically connected to the valve body and the coin can be changed, the separate parts such as the conductive ring or the conductive resin according to the first and second embodiments of the preceding invention are not required, It is possible to prevent the discharge from occurring between the stator and the yoke, while reducing the influence on the peripheral circuit.

Claims (8)

A valve body 20 having a valve chamber 21, a valve seat 22 formed in the valve chamber 21, and a valve body 23 detachably attached to the valve seat 22 to adjust a flow rate of refrigerant. ), A can 40 coupled to the valve body 20 and having a rotor 30 detachably attaching the valve body 23 to the valve seat 22, and coupled to an outer side of the can 40. And a stator 50 for rotationally driving the rotor 30 by inserting a yoke 51 in which magnetic force is generated by energization of the coil, and the stator 50 including the coil and the yoke 51 is molded. Conductive molded by a material, mounted on the mold-shaped stator 50, and coupled with the piping member of the valve body 20 to position and fix the stator 50 with respect to the can 40. A rotation fixing member 59 is provided, and the yoke 51 of the mold-shaped stator 50 is transferred to the valve body 20. In the motor-driven valve, which is provided with a grounding member which was ever connected to the ground, The grounding member is electrically connected to the yoke 51 of the stator 50 and has a conductive fixing pin 63 integrally formed on the stator 50 by an insert mold, and the conductive fixing pin 63. Electric valve, characterized in that configured by the conductive rotation fixing member 59 fixed to the coupling. delete delete delete delete delete delete delete

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