JP7090872B2 - Solenoid valve - Google Patents

Description

The present invention relates to an electric valve and relates to an electric valve that controls a flow rate of a fluid (refrigerant) in, for example, an air conditioning system.

A conventional example of this type of motorized valve is shown in FIG. The electric valve 1'of the conventional example shown is basically a valve body 10 having a valve chamber 14 and a valve seat 15 formed inside the valve chamber 14, and a cylinder with a ceiling portion fixed to the valve body 10 via a base plate 31. A stepping motor 63 including a can 30 having a shape, a stator 40 mounted outside the can 30, and a rotor 50 mounted inside the can 30, a planetary gear reduction mechanism 60 for decelerating the rotation speed of the rotor 50, and the above. The valve body 21 that controls the amount of fluid passing by contacting and separating from the valve seat 15 and the rotary motion of the output gear 57 of the planetary gear reduction mechanism 60 are converted into linear motion via the screw feed mechanism 27 to drive the valve body 21. It is composed of a screw drive member 22 and a screw drive member 22.

A valve port 16 communicating with the valve chamber 14 is formed in the valve body 10, and a pipe 11 is connected to the valve port 16 side so as to communicate with the opening formed on the side surface of the valve chamber 14. Is connected. Further, a screw bearing member 13 having a female threaded portion 13a formed in the lower half of the central portion is fitted into the upper portion of the valve chamber 14 of the valve body 10 and is fixed to the valve body 10 by caulking (caulking portion 17). ..

The stator 40 fitted to the outer peripheral portion of the can 30 is composed of a yoke 41, a bobbin 42, a coil 43, a resin mold 44, etc., and is rotatably supported inside the can 30 (without moving up and down). Is configured by integrally connecting a cylindrical rotor member 51 made of a magnetic material and a sun gear member (also referred to as a pinion gear) 52 made of a resin material. A shaft 62 is inserted into the central portion of the sun gear member 52, and the upper portion of the shaft 62 is supported by a support member 61 arranged inside the top of the can 30.

The sun gear 53 of the sun gear member 52 meshes with a plurality of planetary gears 55 rotatably supported by a shaft 56 provided on a carrier 54 mounted on the bottom surface of the output gear 57. The upper half of the planetary gear 55 meshes with an annular ring gear (internal tooth fixing gear) 58 attached by caulking to the upper part of the cylindrical member 18 fixed to the upper part of the valve body 10, and the lower half of the planetary gear 55 is annular. It meshes with the internal tooth gear 57a of the output gear 57 of the above. The number of teeth of the ring gear 58 and the number of teeth of the internal gear 57a of the output gear 57 are slightly different from each other, whereby the rotation speed of the sun gear 53 is reduced by a large reduction ratio and transmitted to the output gear 57. (Such a gear configuration is called a so-called mysterious planetary gear reduction mechanism 60).

At the center of the bottom of the output gear 57, the upper part of the stepped cylindrical output shaft portion 29 formed on the upper part of the screw drive member (also referred to as a driver) 22 is press-fitted, and the upper part of the output shaft portion 29 is a shaft. The lower part of 62 is fitted. Further, a carrier 54 is placed on the upper portion of the output shaft portion 29 of the screw drive member 22.

A male screw portion 22a formed in the lower part of the screw drive member 22 is screwed into the female screw portion 13a of the screw bearing member 13, and the screw drive member 22 is the rotational motion of the output gear 57 (that is, the rotor 50). Is converted into a linear motion (elevating motion) in the axis O direction (elevating direction) by the screw feeding mechanism 27 including the male screw portion 22a and the female screw portion 13a. Here, the output gear 57 is integrally connected to the screw drive member 22, and if the output gear 57 (rotor 50) rotates, the output gear 57 and the screw drive member 22 are integrally connected to rotate and linearly move in the axis O direction. At the same time, the carrier 53 and the planetary gear 55 mounted on the bottom surface of the output gear 57 also move up and down in accordance with the raising and lowering of the output gear 57. The linear motion of the screw drive member 22 is transmitted to the shaft-shaped valve body 21 via the ball-shaped joint 25 including the ball 23 and the ball seat 24, and the valve body 21 is fixed inside the valve body 10. Guided by a cylindrical spring case 19, it moves in the O direction of the axis. Further, a compression coil spring 26 is compressed between the spring case 19 and the valve body 21, and the valve body 21 is constantly urged in the valve opening direction.

On the other hand, a disc spring 70 is provided between the ring gear 58, which is a fixing member, and the sun gear member 52. The disc spring 70 is supported by the ring gear 58, which is a fixing member, and constantly pushes up the sun gear member 52 toward the support member 61 side of the shaft 62 to bring it into contact with the support member 61, so that the output gear 57 has an output gear 57. Even if it descends, the rotor 50 itself does not descend, and the position in the axis O direction between the rotor 50 and the stator 40 does not change.

With this configuration, the flow path area (valve opening) between the valve body 21 and the valve seat 15 changes, and the flow rate of the refrigerant passing through the valve port 16 can be controlled (see, for example, Patent Document 1 below). ).

Japanese Unexamined Patent Publication No. 2016-106205

However, in the conventional electric valve described in Patent Document 1, the positional relationship between the rotor and the stator does not change and the decrease in torque is suppressed, but the ring gear which is a fixing member when the rotor rotates. Since the disc spring supported by the rotor and the sun gear member of the rotor always slide, there is a concern that the sliding resistance when the rotor rotates increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to slide during rotor rotation while suppressing a decrease in torque without making major changes to the conventional solenoid valve. It is an object of the present invention to provide an electric valve capable of reliably reducing resistance.

In order to solve the above problems, the electric valve according to the present invention is basically provided in a valve body having a valve chamber and a valve seat, a valve body dislocated so as to be able to move up and down in the valve chamber, and the valve body. A motor having a fixed can, a stator mounted outside the can, and a rotor rotatably mounted inside the can, and the rotary motion of the rotor is converted into an elevating motion of the valve body. A screw feed mechanism is provided, and the rotor is moved up and down while rotating by the screw feed mechanism, and the vertical length of the rotor is adjusted to the vertical length of the yoke of the stator from the lowest position to the highest position of the rotor. The screw feed mechanism is set to a length equal to or longer than the length including the full lift amount of the above, and the screw feed mechanism has a female screw portion provided on the screw bearing member fixed to the valve body and a planetary gear reduction mechanism for reducing the rotation speed of the rotor. It is composed of a male screw portion provided on the connected screw drive member, and is characterized in that the rotor is mounted on the screw drive member .

In a more preferred embodiment, the screw drive member or the contact portion of the screw drive member with the rotor is made of metal, and the solar gear member of the rotor mounted on the screw drive member is made of resin.

In another preferred embodiment, a support member is provided that rotatably supports the rotor inside the can, and the support member is press-fitted into the can and fixed.

In a more preferred embodiment, the support member is positioned above the rotor and supports the upper part of the shaft inserted into the center of the rotor.

In a more preferred embodiment, the support member is disposed with a gap from the rotor.

In a more preferred embodiment, the support member is made of resin.

According to the present invention, the vertical length (length in the ascending / descending direction) of the rotor is set longer by the full lift amount. Therefore, for example, a conventional one equipped with a disc spring between the ring gear which is a fixing member and the sun gear member. Compared to this, the decrease in torque can be suppressed without increasing the number of parts, and the sliding resistance during rotor rotation can be reliably reduced, thus reducing the drive torque required for rotation (that is, raising and lowering the valve body). It can be made smaller and the physique can be made smaller.

The vertical sectional view which shows the fully closed state of one Embodiment of the electric valve which concerns on this invention. The vertical sectional view which shows the fully opened state of one Embodiment of the electric valve which concerns on this invention. An enlarged vertical sectional view of a main part of the motorized valve shown in FIGS. 1 and 2. A vertical sectional view showing a conventional motorized valve.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 are vertical cross-sectional views showing an embodiment of the motorized valve according to the present invention, FIG. 1 shows a fully closed state, and FIG. 2 shows a fully open state. Further, FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve shown in FIGS. 1 and 2.

In each drawing, the gaps formed between the members, the separation distance between the members, etc. may be exaggerated in order to facilitate the understanding of the invention and for the convenience of drawing. be.

Further, in the motorized valve of the present embodiment shown below, the parts corresponding to the respective parts of the conventional motorized valve 1'shown in FIG. 4 described above are designated by the same reference numerals and detailed description thereof will be omitted. In the following, we will focus on the differences.

The electric valve 1 of the present embodiment has almost the same basic configuration as the electric valve 1'of the conventional example shown in FIG. 4, but mainly has a valve chamber 14 and a valve body 10 having a valve seat 15, and a valve chamber. A valve body 21 dislocated so as to be able to move up and down in 14, a cylindrical can 30 with a ceiling portion fixed to the valve body 10 via a base plate 31, and a stator 40 and a can 30 mounted on the outside of the can 30. A stepping motor 63 composed of a rotor 50 rotatably mounted inside, a planetary gear reduction mechanism 60 for decelerating the rotation speed of the rotor 50, and a linear motion of the output gear 57 of the planetary gear reduction mechanism 60 are linearly aligned with the valve body 21. It is provided with a screw feed mechanism 27 that converts a motion (elevating motion) into a motion (elevating motion).

As described above, the screw feed mechanism 27 is formed on the female screw portion 13a formed on the inner circumference of the screw bearing member 13 fixed to the upper part of the valve chamber 14 of the valve body 10 and on the outer periphery of the screw drive member 22. It is composed of a male screw portion 22a.

In the above-mentioned conventional motorized valve 1', a disc spring 70 is provided between the ring gear 58 which is a fixing member and the sun gear member 52, and the sun gear member 52 is constantly pushed up toward the support member 61 side of the shaft 62. Even if the output gear 57 is lowered, the rotor 50 itself is not lowered. That is, the rotor 50 is rotatably supported by the disc spring 70 inside the can 30 without moving up and down.

On the other hand, in the electric valve 1 of the present embodiment, the disc spring 70 is not installed, and as shown in the enlarged view of FIG. 3, the lower end of the sun gear member 52 of the rotor 50 is a screw bearing member 13. The output shaft portion 29 of the screw drive member 22 pressed into the center of the bottom of the output gear 57 through a through hole 54a provided in the carrier 54 mounted on the bottom surface of the output gear 57 slightly above the top surface of the output gear 57. It is placed on the top of.

Therefore, when the output gear 57 (rotor 50) rotates, the output gear 57 and the screw drive member 22 rotate and move up and down integrally, and the output gear 57 and the screw drive member 22 move up and down (output gear 57). And together with the screw drive member 22), the rotor 50 moves up and down together with the carrier 53 and the planetary gear 55 mounted on the bottom surface of the output gear 57.

In this case, when the rotor 50 (sun gear member 52) rotates, the lower end surface of the sun gear member 52 and the upper surface of the output shaft portion 29 of the screw drive member 22 connected to the output gear 57 rotate relatively. For example, the screw drive member 22 is made of metal such as SUS, or the contact portion (sliding surface) of the screw drive member 22 with the sun gear member 52 is made of metal (sliding surface). The sun gear member 52 is made of resin), the surface accuracy of the sliding surface is improved, and the self-lubricating action of the resin material of the sun gear member 52 can suppress the sliding resistance.

Further, in the electric valve 1 of the present embodiment, since the rotor 50 moves up and down (up and down) while rotating inside the can 30, in order to suppress a decrease in torque due to a change in the relative position between the rotor 50 and the stator 40. In addition, the vertical length (length in the elevating direction (axis O direction)) b of the rotor member 51 of the rotor 50 is the maximum of the rotor 50 (valve body 21) from the vertical length a of the yoke (pole teeth) 41 of the stator 40. It is set longer than the full lift amount from the descending position (fully closed position, see FIG. 1) to the highest ascending position (fully open position, see FIG. 2). That is, the vertical length b of the rotor member 51 of the rotor 50 adds the full lift amount from the lowest position to the highest position of the rotor 50 (valve body 21) to the vertical length a of the yoke (pole teeth) 41 of the stator 40. It is set to be longer than the length. In other words, at the lowest position of the rotor 50, the upper end of the rotor member 51 of the rotor 50 is higher than the upper end of the yoke 41 of the stator 40, and at the highest position of the rotor 50, the lower end of the rotor member 51 of the rotor 50 is the stator 40. The vertical length b of the rotor member 51 of the rotor 50 is set so as to be lower than the lower end of the yoke 41.

With this configuration, the rotor member 51 (a part of) of the rotor 50 is positioned inside the yoke 41 (upper and lower overall length) of the stator 40 while the rotor 50 moves from the lowest lowered position to the highest raised position while rotating. Therefore, the decrease in torque is suppressed.

Further, in the above-mentioned conventional motorized valve 1', the support member 61 that supports the upper part of the shaft 62 inserted in the central portion of the sun gear member 52 constituting the rotor 50 is extrapolated to the upper part of the shaft 62. It is placed on the upper surface of the sun gear member 52 of the rotor 50 and arranged inside the can 30.

On the other hand, in the motorized valve 1 of the present embodiment, the support member 61 is press-fitted inside the top of the can 30 (relatively immovable and relatively immovable) and fixed.

Specifically, the support member 61 is made of, for example, a thick disk made of a resin material, is set to be slightly larger than the inner diameter of the can 30 in the state before assembly, and has a fitting allowance (fitting allowance) with the can 30. The press-fitting allowance) is slightly crushed and press-fitted into the inside of the top of the sheet metal can 30 to be arranged and fixed. The rotor 50 is arranged below the support member 61 by inserting the upper portion of the shaft 62 (rotatably) into the through hole 61a provided in the central portion of the support member 61. At that time, the support member 61 is provided with a predetermined gap G from the rotor 50 (the sun gear member 52) on the upper side of the rotor 50 (specifically, the upper side of the rotor 50 at the highest position). ) Placement is fixed. In addition, in order to facilitate the positioning of the support member 61, the support member 61 may be placed in contact with the ceiling portion of the can 30 as shown in the illustrated example.

Further, the lower portion of the shaft 62 inserted into the rotor 50 is press-fitted into the center of the bottom of the output gear 57 in detail by the screw bearing member 13 fixed to the valve main body 10, and the lower portion thereof is the valve main body 10. It is supported by being fitted in the upper part of the output shaft portion 29 of the screw drive member 22 inserted into the screw bearing member 13 fixed to the screw bearing member 13.

The screw drive member 22 can be made of metal such as SUS, ceramics, glass, or the like. Further, in this example, the output shaft portion 29 of the screw drive member 22 is press-fitted into the output gear 57, but the output gear 57 and the screw drive member 22 may be configured as one component by insert molding.

With such a configuration, the rotor 50 is rotatably supported inside the can 30 without the upper surface of the sun gear member 52 sliding in contact with the lower surface of the support member 61.

Also in the motorized valve 1 of the present embodiment having such a configuration, the flow path area (valve opening) between the valve body 21 and the valve seat 15 changes as in the above-mentioned conventional motorized valve 1', and the valve is valved. The flow rate of the refrigerant passing through the port 16 can be controlled.

As described above, in the electric valve 1 of the present embodiment, the vertical length (length in the elevating direction) of the rotor 50 is set longer by the full lift amount, so that, for example, between the ring gear which is a fixing member and the sun gear member. Compared to the conventional one equipped with a disc spring, the decrease in torque can be suppressed without increasing the number of parts, and the sliding resistance during rotor rotation can be reliably reduced, thus rotating (that is, the valve body). The drive torque required for (raising and lowering) can be reduced, and the physique can be reduced.

Further, in the motorized valve 1 of the present embodiment, the support member 61 that rotatably supports the rotor 50 inside the can 30 is press-fitted into the can 30 and fixed, so that the rotor 50 and the support member 61 slide. Since it can be suppressed, for example, the sliding resistance during rotor rotation can be reliably reduced as compared with the conventional one in which the support member is placed on the solar gear member of the rotor and arranged inside the can. , The drive torque required for rotation (that is, raising and lowering the valve body) can be reduced, and the physique can be reduced.

In addition, the present invention is other than the type as in the illustrated embodiment, in which the poppet type or piston type valve body is seated on the valve seat and the fluid flow is blocked when the valve body is in the lowest position. Needless to say, it can be used for various types of electric valves. For example, when the valve body is in the highest position, the valve body sits on the valve seat provided on the back side of the valve opening and the flow of fluid is blocked (in this case, the valve shaft and the valve shaft). A compression coil spring that urges the valve body in the valve closing direction is interposed between the valve body and the valve body). Further, even if the valve body is a type of electric valve in which a predetermined amount of passing flow rate is secured through a communication hole provided in the valve body, a bleed groove provided in the valve seat, etc. while the valve body is seated on the valve seat. However, when the valve body is in the lowest position (normally fully closed), a gap of a predetermined size is formed between the valve body and the valve seat to secure a predetermined amount of passing flow rate. It may be a valve closing type electric valve.

1 Electric valve 10 Valve body 13 Thread bearing member 13a Female thread part 14 Valve chamber 15 Valve seat 16 Valve port 18 Cylindrical member 19 Spring case 21 Valve body 22 Thread drive member 22a Male thread part 26 Compression coil spring 27 Thread feed mechanism 29 Output shaft part 30 Can 31 Base plate 40 Stator 50 Rotor 51 Rotor member 52 Sun gear member 57 Output gear 60 Mysterious planetary gear reduction mechanism 61 Support member 62 Shaft 63 Stepping motor a Stator yoke vertical length b Rotor rotor member vertical length

Claims (6)

A valve body with a valve chamber and a valve seat,
The valve body arranged so as to be able to move up and down in the valve chamber,
The can fixed to the valve body and
A motor having a stator mounted outside the can and a rotor rotatably mounted inside the can.
A screw feed mechanism that converts the rotary motion of the rotor into the elevating motion of the valve body is provided.
An electric valve in which the rotor is moved up and down while rotating by the screw feed mechanism.
The vertical length of the rotor is set to be equal to or greater than the vertical length of the yoke of the stator plus the full lift amount from the lowest position to the highest position of the rotor .
The screw feed mechanism includes a female screw portion provided on a screw bearing member fixed to the valve body and a male screw portion provided on a screw drive member connected to a planetary gear reduction mechanism for decelerating the rotation speed of the rotor. Consists of
An electric valve characterized in that the rotor is mounted on the screw drive member . The claim is characterized in that the contact portion of the screw drive member or the screw drive member with the rotor is made of metal, and the solar gear member of the rotor mounted on the screw drive member is made of resin. Item 1. The electric valve according to Item 1. A support member that rotatably supports the rotor inside the can is provided.
The motorized valve according to claim 1 or 2 , wherein the support member is press-fitted into the can and fixed. The motorized valve according to claim 3 , wherein the support member is positioned above the rotor and supports the upper portion of a shaft inserted into the center of the rotor. The motorized valve according to claim 3 or 4 , wherein the support member is arranged with a gap from the rotor. The motorized valve according to any one of claims 3 to 5 , wherein the support member is made of resin.

Images