JP2627868B2 - Motorized valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used as an electronically controlled expansion valve used in a refrigeration cycle of a room air conditioner or a car air conditioner, or as a proportional control valve used in combination with a microcomputer in general industrial fields. It relates to a motor-operated valve.

[0002]

2. Description of the Related Art Conventionally, various types of motor-operated valves for controlling a flow rate by combining a stepping motor and a valve have been proposed. Among them, in order to reduce the size of the motor-operated valve, a stator is housed inside a case. There are things. FIG. 5 shows a conventional motor-operated valve (Japanese Utility Model Publication No. 44869/1994). In this motor-operated valve 35, a coil 13 is provided inside a case 1 and a rotor 1 is provided in an upper half thereof.
The rotary shaft 15 having the valve body 19 having the screw 4 and the screw 29 on the lower outer periphery is arranged. On the other hand, an upper cover 2 provided with an upper bearing 37 on the lower surface is provided on an upper portion of the case 1, and a valve seat 25 and a valve port are provided on a lower portion of the lower portion of the case 1 on an extension of an axis of the rotary shaft 15. 26 and an opening 27 on the upper side of the valve port 26 and a lower bearing 3
6 and a valve body 23 having a female screw 28 below it, and the upper end of the rotary shaft 15 is supported by an upper bearing 37, and the lower portion of the rotary shaft 15 is supported by a lower bearing 36;
The male screw 29 of the valve body 19 is screwed into the female screw 28, and the valve body 19 is moved up and down by the rotation of the rotor 14 by energizing the coil 13, so that the valve seat 25 and the valve body 19 are opened and closed. Is configured. In addition, 30 is a valve opening 2
The first pipe 31 provided in 6 is a second pipe provided in the opening 27.

[0003]

In the above-described conventional motor-operated valve 35, the rotor 14 and the coil 13 are connected by a casing.
The motor-operated valve itself can be designed in a small size because the motor-operated valve itself is built inside the rotor 1, but the rotating shaft 15 integrated with the rotor 14 is supported by both lower bearings 36 and upper bearings 37. Therefore, if the shaft centers of the two bearings are not assembled with the same precision, the rotary shaft 15 is twisted, and if the clearance between the rotary shaft 15 and the two bearings is large, the operating noise increases. In addition, if the shaft centers of both bearings are not accurately aligned and assembled, a high frictional force is applied in the radial direction due to the twisting of the rotating shaft 15, and as a result, smooth rotation is obtained. However, there is a problem that the torque decreases.

[0004]

According to the present invention, a coil 13 is provided.
A deep hole 34 provided at the center of the rotating shaft 15 provided with the rotor 14 is rotatably inserted into a central portion of the inside of the rotating shaft 15 with the shaft 8 provided from the upper portion as a guide shaft. The rotary shaft 15 can be moved up and down.
By using a so-called cantilever bearing support for the rotating shaft, stable rotation and stable rotating torque can be obtained with low operating noise. In addition, the assemblability can be simplified, and the size of the electric valve itself can be reduced. As a result, the above problems were solved.

That is, the structure of the first motor-operated valve according to the present invention comprises a coil 13 fixed inside a cylindrical case 1.
And a valve body 19 via a ball 17 and a compression coil spring 18 at the center of a lower end provided inside the coil 13 and a screw 29 on the outer periphery, and a rotor 1 on the outer periphery of the upper half.
A rotating shaft 15 which moves up and down while rotating by energizing the coil 13 and a chamber 33 at the center provided at the lower end of the cylindrical case 1; A valve body 23 having a valve seat 25 and a valve port 26 at a lower portion of the chamber 33 and an opening 32 at a side of the chamber 33; In an electric valve in which a male screw 29 is screwed into a female screw 28 of the valve body 23 and a valve element 19 is provided corresponding to the valve seat 25, the coil 1
A bracket 7 is provided at an upper end of the bracket 3, and a shaft 8 having a length slightly lower than an intermediate portion of the coil 13 is fixed to a central portion of the bracket 7 corresponding to the axis of the rotary shaft 15 in a hanging manner. On the other hand, a deep hole 34 is provided at the center of the upper half of the rotating shaft 15, and the deep hole 34 is formed in the hanging shaft 8.
Characterized in that it is rotatably inserted into the device.

The structure of the second motor-operated valve according to the present invention comprises a coil 13 fixed to the outside of the cap-shaped case 1a and a ball 17 at the center of the lower end provided inside the case 1a. A rotary shaft 15 having a valve element 19 via a coil spring 18, a screw 29 on the outer peripheral part, a rotor 14 integrally on the outer peripheral part of the upper half, and moving up and down while rotating by energizing the coil 13; Cap-shaped case 1
A chamber 33 is provided at a central portion provided at the lower end of a, and a female screw 28 screwable with the male screw 29 is provided at an upper portion thereof, and a valve seat 25 and a valve port 2 are provided at a lower portion of the chamber 33.
And a valve body 23 having an opening 32 on the side of the chamber 33. The male screw 29 of the rotary shaft 15 is screwed into the female screw 28 of the valve body 23, and the valve body 19 is connected to a valve seat. 25, a shaft 8 having a length slightly lower than an intermediate portion of the coil 13 is fixed to the center of the top wall of the cap-shaped case 1a in a drooping manner. A deep hole 34 is provided in the center of the upper half of the shaft 15, and the deep hole 34 is rotatably inserted into the hanging shaft 8.

The structure of the third motor-operated valve according to the present invention is such that the compression coil spring 16 is mounted at the bottom of the deep hole 34 of the rotary shaft 15 in the first and second motor-operated valves. The gap between the upper surface of the compression coil spring 16 and the lower end surface of the shaft 8 at the time of the valve is formed to be slightly shorter than the distance from the upper end of the female screw 28 to the lower end of the male screw 29.

[0008]

The motor-operated valve according to the present invention can reduce the clearance by adopting the above-mentioned structure, that is, the bearing support structure in which the cantilever shaft is inserted into the deep hole of the rotating shaft. As in the case of the dual-bearing support structure, it is no longer necessary to manage the shaft center, which was necessary when assembling, so that stable operation and stable torque can be obtained with low operating noise, and the assemblability can be simplified. In addition, the size of the electric valve itself can be reduced.

[0009]

【Example】

Embodiment 1 An embodiment of a motor-operated valve according to the present invention will be described in detail with reference to FIGS. The basic configuration of the motor-operated valve according to the present invention includes a cylindrical case 1 made of a non-magnetic material provided with a coil 13 therein, and a chamber 33 provided in a central portion provided at a lower portion of the case 1 and an upper opening thereof. A valve body 23 having a female thread 28, a valve seat 25 and a valve port 26 at a lower portion and an opening 32 at a side portion, and a valve body 19 at a lower end provided inside the cylindrical case 1 are provided. Screw 2 around the circumference
And a rotary shaft 15 having a rotor 14 on the outer periphery of the upper portion of the valve body. The rotor 14 on the upper portion of the rotary shaft is located inside the coil 13 and an external thread 29 of the valve body is screwed into an internal thread 28 of the valve body. This is a motorized valve with a built-in coil in which the valve element 19 corresponds to the valve seat 25.

That is, the coil 13 is composed of upper and lower two coils, and a predetermined number of windings having a predetermined wire diameter are wound around a cylindrical coil bobbin 11, respectively.
Is fixed by being sandwiched between the upper and lower directions by magnetic pole plates 9 and 10. Here, the upper and lower two coils are integrated by welding or the like by the magnetic pole plates 10, and this coil is
And is welded. The coil bobbin 11 is provided with a connection terminal 5, and the end of the above-described winding is connected to the connection terminal 5 by soldering or the like. A plate 12 for integrally fixing with the valve body 23 by welding or the like is provided below the coil 13.
It is integrally fixed together with 0 by caulking or the like.

A bracket 7 having an H-shaped cross section is provided on the upper part of the coil 13 in the same manner as the lower plate 12.
The shaft 8 which is slightly fixed below the center of the bracket 7 and which is slightly lower than the center of the coil 13 is fixed downwardly by caulking or the like. The connection terminal 5 is connected to a substrate 6 fixed on an upper portion of a bracket 7.
To the socket 4 soldered to the center of the substrate 6 by wiring provided on the substrate 6, and further connected to the upper cover 2 by the socket 4. By inserting a connection pin 3 erected by a glass mold or the like in order to secure the electrical insulation described above, it is electrically connected to an external circuit (not shown) for driving and controlling the electric valve. The valve body 23, the cylindrical case 1 and the upper cover 2 are integrally fixed by welding or the like while maintaining airtightness.

On the inner side of the coil 13, a deep hole 34 is provided along the axis at the center of the upper half, and a rotary shaft 15 integrally fixed with a rotor 14 whose outer peripheral portion is magnetized is provided on the outer periphery thereof.
With the compression coil spring 16 loaded in the bottom of the deep hole 34, the deep hole 34 is inserted into the shaft 8 from below, and the shaft 8 is rotatably supported using the shaft 8 as a guide shaft.
Further, a valve body 19 corresponding to a valve seat 25 provided at the front end at the center of the valve body 23 is provided below the rotary shaft 15.
7, integrally supported by a caulking or the like via a compression coil spring 18;
9 are formed.

On the other hand, the valve body 23 has a chamber 33 in the center, an internal thread 28 which can be screwed with the external thread 29 of the valve body at the upper opening thereof, and the valve body 1 at the lower center.
9 and a valve seat 25 and a valve opening 26 corresponding to the opening 3 on the side.
The filter 27 is provided below the valve port 26.
The first pipe 30 provided with the filter 27 is provided, and the second pipe 31 provided with the filter 27 is also provided in the opening 32.

The female screw 28 in the upper opening of the valve main body 23 is formed in the lower half of the center of the sleeve 22 having a flange on the upper outer periphery provided by press-fitting on the upper part of the valve main body 23. It is formed to have a slightly larger diameter than the root diameter, and a male screw 29 formed on the outer periphery of the lower part of the rotary shaft 15 is screwed to the female screw 28. Here, male screw 29
In the illustrated example, the length of vertical engagement with the female screw 28 is the stroke length of the rotary shaft 15 as shown in FIG. The gap dimension between the upper surface and the lower end surface of the shaft 8 is
It is set to be slightly shorter than the engagement length between the male screw and the female screw. Strictly speaking, the gap dimension between the upper surface of the compression coil spring 16 and the lower end surface of the shaft 8 when the valve is closed is slightly shorter than the dimension “A” from the upper end of the female screw 28 to the lower end of the male screw 29. −α ”. As a result, when the valve is rotated in the valve opening direction exceeding the stroke length, the screw is disengaged, and the rotary shaft 15 idles with the compression coil spring 16 slightly compressed. Therefore, the next time the rotary shaft 15 is rotated in the reverse direction to close the valve, the disengaged male screw and female screw can be easily and reliably engaged.

A pin 21 is provided on the upper surface of the sleeve 22 so as to protrude upward, and a rib 20 provided on the inner lower surface of the rotor 14 as shown in FIG.
The rotation of the valve body 19 in the valve closing direction after fully closed is mechanically stopped by preventing the valve body 19 from biting into the valve seat 25, and the operation at the time of opening the valve is made smoother. I have.

In the above-described embodiment, the compression coil spring 16 is mounted on the bottom of the deep hole 34 of the rotary shaft 15, but the compression coil spring 16 is not always required. For example, the upper bracket 7
A pin (not shown) is fixed to the lower surface of the
If the rotation of the rotor 14 is stopped by this pin in a state where the 9 and the female screw 28 do not come off, the rotating shaft 15 can smoothly rotate reversibly without the compression coil spring 16.

Embodiment 2 FIG. 4 is a longitudinal sectional side view showing a second embodiment of the present invention, in which a coil 13 is disposed outside a cap-shaped case 1a, and a rotary shaft similar to that of the first embodiment is disposed inside the coil 13. 15 is a can-seal type electric valve in which 15 is arranged. In this embodiment, the case 1a is formed in a cap shape and the coil 13
A shaft 8 having a length slightly lower than the intermediate portion of the cap-shaped case 1a is directly fixed to the center of the lower surface of the top wall of the cap-shaped case 1a in a hanging manner. Other parts configuration
Since it is completely the same as the first embodiment, detailed description is omitted.

[0018]

The operation of the motor-operated valve shown in FIGS. 1 and 4 will be described below. Although the motor-operated valve of the present invention is of the reversible type, a case where the fluid flows from the second pipe 31 to the valve port 26 to the first pipe 30 will be described below. Now, when an external signal is applied from an external circuit to open the connection pin 3 electrically insulated by a glass mold or the like while the valve port 26 is fully closed, the cylindrical case 1 is connected via the connection terminal 5. Is energized to the coil 13 inside the shaft, and the rotating shaft 15 supported with the shaft 8 as a guide shaft
Rotates with the rotor 14. The rotation of the rotating shaft 15 is performed by a male screw 29 formed on the lower outer peripheral portion thereof and the valve body 23.
As a result, the valve body 19 rises due to the engagement with the female thread 28 of the sleeve 22 fixed to the upper part of the sleeve 22, and the valve body 19 also rises and separates from the valve seat 25 to open the valve.

Since the degree of rotation of the rotary shaft 15 can be controlled by an external signal, the gap between the valve body 19 and the valve seat 25 facing the valve body 19 can be adjusted, so that the valve opening can be adjusted. Further, when the rotary shaft 15 is further rotated in the valve opening direction from the position where the valve body 19 is lifted and is completely opened, the engagement between the male screw 29 and the female screw 28 is released, and the deep hole 34 is formed. When the compression coil spring 16 is slightly compressed between the lower end of the shaft 8 and the rotating shaft 1
No. 5 is in the idling state, thereby preventing the bite of the screw and preventing the starting at the time of the next valve closing.

Next, when an external signal is applied in the direction of closing the valve from the above-described valve open state, the rotating shaft 15 rotates in the downward direction. At this time, the lower end of the shaft 8 and the deep hole 34 of the rotating shaft 15 are Since the rotating shaft 15 is urged downward by the compression coil spring 16 interposed between the bottom and the bottom, the lower end of the male screw 29 of the rotating shaft is pressed against the upper end of the female screw 28, and the removed screw Is automatically and reliably restored. As a result, the rotating shaft 15 moves downward, and the valve body 1
9 is lowered to close the valve. At this time, similarly to the valve opening, the valve opening can be adjusted by an external signal from an external circuit. Further, when the valve element 19 is lowered together with the rotary shaft 15 to be in a completely closed state, the pins 21 provided on the upper surface of the sleeve 22 and the ribs 20 provided on the inner lower surface of the rotor 14 are brought into contact with each other, thereby enabling a complete Mechanically stop rotation in the valve closing direction after closing,
The bite between the male screw 29 and the female screw 28 is prevented, and starting is impossible at the next valve opening.

As the flow of the fluid, the fluid flowing from the second pipe 31 at the time of closing the valve is supplied from the chamber 33 at the center of the valve body 23 to the first pipe 30 through the valve port 26.
Flows to The flow rate of the fluid is determined by the valve opening adjusted by the gap between the valve body 19 and the valve seat 25 facing the valve body 19 based on the vertical movement of the rotary shaft 15 due to the external signal described above. In addition, the flow of the fluid is the first pipe 30 opposite to the above.
The same applies to the case of flowing from the valve port 26 to the second pipe 31.

In the above description, the compression coil spring 16 is provided at the bottom of the deep hole 34 provided at the center of the upper half of the rotary shaft 15. However, in the case where the compression coil spring 16 is not provided, The pin is fixed to the lower surface of the bracket 7 or the lower surface of the top wall of the case 1a in a hanging manner,
In a state where the female screw 28 does not come off, if the rotation of the rotor 14 is stopped by the same means as the engagement of the lower pin 21 and the rib 20 of the rotor 14 with this pin, the rotation start at the time of valve closing is started. Can be performed smoothly.

[0023]

According to the present invention, a shaft fixed to the center of the top wall of the bracket or the case above the rotary shaft is provided as a guide shaft, and the shaft is provided with a deep hole in the center of the upper half. Since the rotating shaft can be rotated and moved up and down by inserting the deep hole of the provided rotating shaft, that is, the supporting structure is provided by a cantilevered guide shaft, so that the clearance between the shaft and the rotating shaft can be reduced. The need to manage the shaft core, which was required in the case of a support structure with two upper and lower bearings, is no longer necessary, resulting in low operating noise, stable rotation and stable torque, assembling work can be simplified, and the electric valve itself There is an advantage that the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a motor-operated valve according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a partially enlarged sectional view of a main part of the motor-operated valve according to the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 5 is a longitudinal sectional view showing a conventional motor-operated valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical case 1a Cap-shaped case 2
Top cover 3 Connection pin 4 Socket 5
Connection terminal 6 Board 7 Bracket 8
Shaft 9, 10 Magnetic pole plate 11 Coil bobbin 12
Plate 13 Coil 14 Rotor 1
5 Rotating shaft 16 Compression coil spring 17 Ball 1
8 Compression coil spring 19 Valve element 20 Rib 2
1 pin 22 sleeve 23 valve body 2
4 Receiving part 25 Valve seat 26 Valve port 2
7 Filter 28 Female thread 29 Male thread 3
0 first pipe 31 second pipe 32 opening 3
3 Chamber 34 Deep hole 35 Conventional electric valve 3
6 Lower bearing 37 Upper bearing

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Osamu Takami 100, Kutoku-cho, Ogaki-shi, Gifu Prefecture Within Taiheiyo Kogyo Co., Ltd. Within Seiko Co., Ltd. (72) Inventor Mitsunori Matsubara 6-2-61 Imafukunishi, Joto-ku, Osaka City, Osaka Prefecture Inside Matsushita Seiko Co., Ltd. No. 61 Matsushita Seiko Co., Ltd. (72) Inventor Hiroaki Sakai 6-2-61 Imafuku Nishi, Joto-ku, Osaka City, Osaka Prefecture Matsushita Seiko Co., Ltd. (56) References JP-A-4-254083 (JP, A) Kaihei 1-182680 (JP, A)

Claims (3)

(57) [Claims] 1. A coil 13 fixed to the inside of a cylindrical case 1 and a valve body 19 provided at the center of a lower end provided inside the coil 13 via a ball 17 and a compression coil spring 18 and an outer periphery thereof. A rotary shaft 15 having a screw 29 in the upper portion thereof, integrally having a rotor 14 on the outer periphery of the upper half, and moving up and down while rotating by energizing the coil 13;
A chamber 33 is provided at a central portion provided at a lower end of the chamber 33. A female screw 28 screwable with the male screw 29 is provided at an upper opening thereof, and a valve seat 25 and a valve port 26 are provided at a lower portion of the chamber 33. 33 comprises a valve body 23 having an opening 32 on the side thereof. The external thread 29 of the rotary shaft 15 is screwed into the female thread 28 of the valve body 23 and the valve body 19
The bracket 13 is provided at the upper end of the coil 13, and the center of the bracket 7 corresponding to the axis of the rotating shaft 15 is located between the middle of the coil 13. The shaft 8 having a length slightly below is fixed in a hanging manner, while a deep hole 34 is provided in the center of the upper half of the rotating shaft 15, and the deep hole 34 is rotatably inserted into the hanging shaft 8. A motor-operated valve characterized in that: 2. A coil 13 fixed to the outside of a cap-shaped case 1a, and a valve body 19 via a ball 17 and a compression coil spring 18 at the center of a lower end provided inside the case 1a. The rotary shaft 15 is provided at the lower end of the cap-shaped case 1a. A chamber 33 is provided at the center and a female screw 28 screwable with the male screw 29 is provided at the upper part thereof.
5 and a valve port 26, and an opening 32 is provided on the side of the chamber 33.
An electric valve provided with a male screw 29 of the rotating shaft 15 screwed into a female screw 28 of the valve main body 23 and a valve body 19 provided corresponding to a valve seat 25. A shaft 8 having a length slightly lower than an intermediate portion of the coil 13 is fixed to the center of the top wall of the case 1a in a drooping manner, while a deep hole 34 is provided in the center of the upper half of the rotating shaft 15. An electric valve characterized in that the deep hole 34 is rotatably inserted into the hanging shaft 8. 3. The compression coil spring 16 is mounted on the bottom of the deep hole 34 of the rotary shaft 15, and the compression coil spring 1 is closed when the valve is closed.
3. The motor-operated valve according to claim 1, wherein a distance between the upper surface of the shaft and the lower end surface of the shaft is formed to be slightly shorter than a distance from an upper end of the female screw to a lower end of the male screw.