JP2000297873A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a can and to improve the load control and durability for the can by forming the can into a bottomed cylindrical shape, setting the radius of curvature of the bottom section larger than the radius of the can, and forming the lowermost section into a flat surface. SOLUTION: A can 3 has a bottomed cylindrical shape constituted of a flange section 31 connected to a valve main body by welding, a cylindrical section 32 continued to the flange section 31, and a bottom section 33 continued to the cylindrical section 32. The bottom section 33 is constituted of first, second and third curved surfaces 33a, 33b, 33c having multiple radii of curvature ρ1, ρ2, ρ3 and a flat surface 33d (lowermost section) continued to the third curved surface 33c. The second radius of curvature ρ2 is made larger than the radius R of the can 3. The second radius of curvature ρ2 is made about two times the radius R of the can 3 here. The flat surface 33d is made perpendicular to the longitudinal axis (Z axis) of the cylindrical section 32, thereby the can 3 can be miniaturized in height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-operated valve incorporated in an air conditioner, a refrigerator, and the like.
The present invention relates to a motor-operated valve having improved can load management and durability.

[0002]

2. Description of the Related Art In general, a motor-operated valve incorporated in an air conditioner and a refrigerator is a device for mechanically and automatically adjusting a flow rate of a refrigerant fluid or the like. This type of motor-operated valve usually includes a valve body having a valve chamber and a valve seat, and a bottomed cylindrical can fixed to an upper portion of the valve body via a flange. Has a built-in rotor, and a stator having an insertion hole at the center is externally fitted to the outside of the can.

FIG. 3 is a longitudinal sectional view of a conventional motor-operated valve 1 'as described above. The valve body 2 includes a valve chamber 21, a guide bush fixing portion 22, and a can fixing portion 23,
The valve chamber 21 is provided with the fluid inlet / outlet passages 2a and 2b, and a valve seat 24 to which a needle valve 60 serving as a valve body comes and goes is provided inside the valve chamber 21.

[0004] The guide bush fixing portion 22 is provided in the valve chamber 2.
1, and fixes the valve body 2 and the guide bush 61. On the inner periphery of the guide bush 61, a female screw 6
A male screw portion 64 formed on the outer periphery of the valve shaft holder 63 is screwed into the female screw portion 62.
In the valve shaft holder 63, a valve body 60 is provided at the lower end.
Is slidably fitted into the valve shaft 70 forming
The valve shaft 70 is constantly urged downward by a compression coil spring 71 compressed in the valve shaft holder 63.

The can fixing portion 23 is an annular plate which is located at the upper end of the valve body 2 and has an inner peripheral surface fixed by caulking and a lower end surface joined by welding. The valve body 2 and the can 3 'are fixed by welding to the flange 31' of the 3 '.

The fitting between the valve shaft 70 and the rotor 4 is such that an integrally formed product such as the valve shaft holder 63 and the sleeve 65 is externally fitted to the valve shaft 70 and is internally fitted to the rotor 4 with the permanent magnet. It is done by that. In addition, the valve shaft 70
The upper limit of the upward movement of the rotor 4 and the like is provided by the contact between the spring 74 provided at the upper part of the rotor 4 and having the flat upper end 74a and the inside of the can 3 '.

The can 3 'has a flange 31' joined to the valve body 2 by welding, a cylindrical portion 32 'connected to the flange 31', and a bottom portion connected to the cylindrical portion 32 '. 3
3 'and has a bottomed cylindrical shape. further,
The bottom 33 ′ is located above the can 3 ′, has a hemispherical shape that covers the top of the valve shaft 70, and is in contact with the spring 74 on the inner surface.

The rotor 4 is provided inside the can 3 '.
And a stator 5 is externally fitted to the outside of the can 3 '. Stator coils 51 and 51 and a yoke 52 are stored above and below the inside of the stator 5. The stator coils 51, 51 are energized and energized through a cable 8 on which lead wires are bundled and a connector 7 provided on the outer periphery of the stator 5, thereby rotating the rotor 4 and opening and closing the needle valve 60. The flow rate of the fluid flowing between the fluid inlet / outlet passages 2a and 2b is adjusted.

The mounting posture of the stator 5 with respect to the can 3 'is selected according to the position of the connector 7 with respect to the fluid inlet / outlet passages 2a and 2b. The motor-operated valve 1 'having such a configuration is usually fixed in a device such as an air conditioner.

[0010]

In the motor-operated valve 1 'as described above, since the bottom 33' of the can 3 'is hemispherical, there is no local stress concentration at the bottom 33'. Although the strength is strong, the height of the bottom portion 33 'of the hemispherical portion needs to be equal to the radius of the can 3', so that it is impossible to reduce the height of the can. There are inconveniences.

On the other hand, as shown in FIG. 4, there is a technique in which the height of the can 3 "is reduced by increasing the radius of curvature of the bottom 33". The stress tends to concentrate on a portion 33a "where the radius of curvature changes from"", and there is a problem that the strength of the can 3" is weakened at this portion.

In the conventional motor-operated valve 1 'and motor-operated valve 1 "shown in FIG. 3 or 4, the movement of the valve shaft 70 and the rotor 4 at the uppermost limit is prevented by the upper end of the spring 74 and the can 3' ( Since the contact is made by contact with the spherical inner surface of the bottom 33 '(bottom 33 ") of the can 3"), the spherical inner surface and the upper end flat portion 74a of the spring 74 tend not to uniformly contact with each other, and the contact portion is formed. There is a problem in that the force is not uniform, and an uneven load acts on the can, making it difficult to manage the load.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a motor-operated valve in which the size of a can is reduced, the load on the can is improved, and the durability of the can is improved. To provide.

[0014]

In order to achieve the above object,
An electric valve according to the present invention includes a valve body, a can fixed to the valve body, and a rotor fitted to the can, wherein the can has a cylindrical shape having a bottom, Are characterized by having a radius of curvature larger than the radius of the can and a bottom surface thereof being a flat surface.

Further, the bottom portion is a curved surface having a plurality of radii of curvature, and the lowest portion is a flat surface connected to the curved surface. Further, as a preferred specific embodiment of the motor-operated valve according to the present invention, the flat surface of the bottom portion is characterized by being orthogonal to the cylindrical longitudinal axis.

Further, as another specific mode of the motor-operated valve according to the present invention, the bottom portion includes a first curved surface connected to the cylindrical shape, a second curved surface connected to the first curved surface, A third curved surface connected to a second curved surface and the flat surface connected to the third curved surface, or a radius of curvature of the first curved surface and the third curved surface is larger than a radius of the can. The radius of curvature of the second curved surface is smaller than the radius of the can. Further, the rotor is provided with a spring, and the spring has a flat portion in contact with the bottom of the can.

As described above, in the motor-operated valve according to the present invention, the can has a cylindrical shape having a bottom, the bottom having a radius of curvature larger than the radius of the can, and a bottom most flat. Because of the surface, the size can be reduced as compared with the case where the bottom is a hemisphere.

The can has a cylindrical axis in the longitudinal direction of the can perpendicular to the flat surface of the bottom, and the flat surface and the spring are in surface contact. It can be done easily.

Further, the bottom of the can has a plurality of radii of curvature such as a first curved surface, a second curved surface, a third curved surface and the like, and has a flat surface. And the radius of curvature of the third curved surface is smaller than the radius of the can, and the radius of curvature of the second curved surface is larger than the radius of the can. And the third curved surface, the can durability can be improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a motor-operated valve according to the present invention will be described with reference to the drawings. In the description of the embodiment, components having the same function are denoted by the same reference numerals. 1 and 2 show an embodiment of a motor-operated valve according to the present invention. FIG. 1 is a longitudinal sectional view of the motor-operated valve 1, and FIG. 2 is a longitudinal section of a can 3 in the motor-operated valve 1 of FIG. FIG.

The motor-operated valve 1 has a valve body 2 having a valve chamber 21.
And a cylindrical can 3 with a bottom fixed to the valve body 2 via a flange 31. The can 3 incorporates a rotor 4 and has an insertion hole 53 at the center. The stator 5 is externally fitted. The valve body 2 includes a valve chamber 21, a guide bush fixing part 22, and a can fixing part 23. The valve chamber 21 is provided with fluid inlet / outlet passages 2a and 2b, and has a valve body therein. The valve seat 24 to which the needle valve 60 comes and goes is provided.

The guide bush fixing portion 22 is provided in the valve chamber 2
1 and is located above the valve chamber 21 and fixes the valve body 2 and the guide bush 61. The guide bush 6
1 is formed with an internal thread 62 on the inner periphery thereof.
A male screw portion 64 formed on the outer periphery of the valve shaft holder 63 is screwed into the screw shaft. A valve shaft 70 forming a valve body 60 at a lower end portion is slidably fitted into the valve shaft holder 63. The valve shaft 70 is contracted into the valve shaft holder 63. The compression coil spring 71 is always biased downward.

The can fixed part 23 is an annular plate fixed at the upper end of the valve body 2 by caulking and fixed to the valve body 2 by welding. Is fixed to the valve main body 2 and the can 3 by so-called joint welding. The welding between the valve body 2 and the can 3 may be so-called butt welding in which the end of the can 3 and the end of the annular plate are directly welded without forming the flange 31 of the can 3. That is, as shown in FIG. 5, a step 23a is provided on the outer peripheral side of the upper end of the can fixed portion 23 integrated with the valve body 2, and the step 23a
The ends of the cans 3 are so-called butt-welded.

The fitting between the valve shaft 70 and the rotor 4 is performed by externally fitting the valve shaft 70 with an integrally formed product such as the valve shaft holder 63 and the sleeve 65, and by fitting the molded product inside the rotor 4 with permanent magnets. It is done by that. In addition, the valve shaft 70
The upper limit of the upward movement of the rotor 4 and the like is provided by the contact between the spring 74 provided at the upper part of the rotor 4 and having the flat upper end 74a and the inside of the can 3. here,
An annular gap 72 is provided between the valve shaft 70 and the valve shaft holder 63 so that fluid can pass therethrough. Fluid in the valve chamber 21 passes through the annular gap 72 from the hole 73 of the valve shaft holder 63. The valve body 21 and the inside of the can 3 are pulled out into the can 3 so as to equalize the pressure, thereby simplifying the shape of the valve body 2 and improving the assembling accuracy.

As shown in FIG. 2, the can 3 has a flange 31 joined to the valve body 2 by welding, a cylindrical portion 32 connected to the flange 31, and a cylindrical portion 32. It has a bottomed cylindrical shape composed of a continuous bottom portion 33. The bottom portion 33 is located on the top of the can 3 and covers the top of the valve shaft 70 and the like, so that the inside thereof and the spring 74 come into contact with each other, and a curved surface having a plurality of radii of curvature and a flat surface It consists of That is, a first curved surface 33a connected to the cylindrical portion 32 and the first curved surface 33a
, A third curved surface 33c continuous with the second curved surface 33b, and a flat surface 33d continuous with the third curved surface 33c, the first curved surface 33a, the second curved surface 33b And the third curved surface 33c have a first radius of curvature ρ1, a second radius of curvature ρ2, and a third radius of curvature ρ3, respectively.
And a flat surface 33d
Is perpendicular to the axis (Z axis) in the longitudinal direction of the cylindrical portion 32, and the normal line of the flat surface 33d and the axis (Z axis) match.

The first radius of curvature ρ1 and the third radius of curvature ρ3 are smaller than the radius R of the can 3, and the second radius of curvature ρ2 is larger than the radius R of the can 3. It is. Therefore, on the curved surface of the bottom portion 33 having a plurality of radii of curvature, the first radius of curvature ρ1 and the third radius of curvature ρ3 are two fulcrum portions. In the present embodiment, the first radius of curvature ρ1 and the third radius of curvature ρ3 are approximately 約 times the radius R of the can 3, and the second radius of curvature ρ2 is approximately twice the radius R of the can 3. And

The rotor 4 is built in the can 3, and a stator 5 is externally fitted to the outside of the can 3. Stator coils 51, 51 and The yoke 52 is stored. The stator coils 51 and 51 include a cable 8 on which lead wires are bundled and a connector 7 provided on the outer periphery of the stator 5.
The rotor 4 is rotated by being energized and energized to open and close the needle valve 60, thereby adjusting the flow rate of the fluid flowing between the fluid inlet / outlet passages 2a and 2b.

The stator 5 has an insertion hole 53 at the center thereof which is fitted to the can 3, and extends radially outward from the lower end of the insertion hole 53 toward the outer peripheral surface of the stator 5. Four projecting locking holding pieces 54 are provided at predetermined angular intervals (90 degrees).

The engagement between the stator 5 and the can 3 is held by
After the stator 5 and the locking tool 6 are fitted, the stator 5 having the insertion hole 53 is externally fitted to the can 3 from the lower end surface. A can cover 55 concentric with the insertion hole 53 is formed integrally with the stator 5 on the upper portion of the stator 5 so that the can 3 and the stator coils 51 are not exposed to the outside. Have been. The cover 55 may be provided as needed.

In the motor-operated valve 1 having such a configuration, when the stator coils 51, 51 are energized in one direction, the rotor 4, the sleeve 65 and the like rotate integrally, and the female screw 6
The valve shaft 70 is lowered by screwing by screwing the male screw part 2 and the male screw part 64, and the valve body 60 is moved to the valve seat 24.
And the valve opening / closing port 25 is closed. At the time when the valve opening / closing port 25 is closed, the sleeve 65 has not yet contacted the valve closing stopper 66, and the valve body 60 is
With the valve 5 closed, the valve shaft holder 63, the sleeve 65, and the like are further rotated down. At this time, the descending amount of the sleeve 65 with respect to the valve shaft 70 is absorbed by the compression coil spring 71 being compressed.

Thereafter, when the valve shaft holder 63 and the like are further rotated down, the sleeve 65 is closed.
6, whereby even if the energization of the rotor 4 is continued, the rotational downward movement of the rotor 4, the sleeve 65, and the like is forcibly stopped. On the other hand, when the stator coils 51, 51 are energized in the opposite direction, the stator 5
Rotates in the opposite direction, the valve element 60 is separated from the valve seat 24, and the valve element opening / closing port 25 is opened.

As described above, the above embodiment of the present invention
The following functions are provided by the above configuration. The motor-operated valve 1 according to the present embodiment includes a valve body 2, a can 3 fixed to the valve body 2, and a rotor 4 fitted to the can 3. It has a bottomed cylindrical shape including a flange portion 31 to be joined, a cylindrical portion 32 connected to the flange portion 31, and a bottom portion 33 connected to the cylindrical portion 32. Has a radius of curvature ρ2 larger than the radius R of the above, and has a flat surface 33d. Therefore, the height of the can 3 can be reduced in size as compared with a case where the bottom is made hemispherical.

The longitudinal axis (Z-axis) of the cylindrical portion 32 and the flat surface 33d of the bottom portion 33 are orthogonal to each other, and the flat surface 33d and the spring 74 are in contact with each other by surface contact. Therefore, the load on the can 3 can be easily managed, and the reliability of the motor-operated valve 1 can be improved.

Further, the bottom portion 33 of the can 3 has a first curved surface 33a connected to the cylindrical portion 32 and the first curved surface 33a.
3a, a second curved surface 33b and the second curved surface 33b
And a flat surface 33d continuous with the third curved surface 33c. The first curved surface 33a and the third curved surface 33c each have a first curved surface R smaller than the radius R of the can. Since two fulcrum portions having a radius of curvature ρ1 and a third radius of curvature ρ3 are provided, even when the bottom 33 is repeatedly subjected to stress, the repeated stress can be reduced. Electric valve 1
Life can be extended.

[0035]

As can be understood from the above description, the motor-operated valve of the present invention can reduce the size of the can, easily manage the load on the can, and reduce the stress concentration on the can. Therefore, the life of the motor-operated valve can be prolonged, and the reliability can be improved.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a can in the motor-operated valve of FIG.

FIG. 3 is a longitudinal sectional view of a conventional electric valve.

FIG. 4 is a longitudinal sectional view of another conventional electric valve.

FIG. 5 is a longitudinal sectional view of a connection portion between a can portion of a motor-operated valve and a valve body according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric valve 2 Valve main body 3 Can 4 Rotor 33 Bottom part 33a First curved surface 33b Second curved surface 33c Third curved surface 33d Flat surface 74 Spring

Continuing on the front page (72) Inventor Takao Harada 7-17-24 Todoroki, Setagaya-ku, Tokyo Inside Fuji Machine Co., Ltd. F-term (reference) 3H062 BB30 BB33 CC01 FF41 HH04 HH08 HH09 5H605 AA02 BB05 BB20 CC01 DD09 DD37 GG02 5H607 AA05 BB09 BB14 CC03 EE52 FF01 JJ04

Claims (6)

[Claims] 1. A motor-operated valve comprising a valve body, a can fixed to the valve body, and a rotor fitted to the can, wherein the can has a cylindrical shape having a bottom. A motor-operated valve characterized in that the bottom has a radius of curvature larger than the radius of the can and the bottom is a flat surface. 2. A motor-operated valve comprising a valve body, a can fixed to the valve body, and a rotor fitted to the can, wherein the can has a cylindrical shape having a bottom, A motor-operated valve, wherein a bottom portion is a curved surface having a plurality of radii of curvature, and the lowest portion is a flat surface connected to the curved surface. 3. The motor-operated valve according to claim 2, wherein the flat surface of the bottom portion is orthogonal to the longitudinal axis of the cylindrical shape. 4. The bottom portion includes a first curved surface connected to the cylindrical shape, a second curved surface connected to the first curved surface, a third curved surface connected to the second curved surface, and a third curved surface connected to the third curved surface. The motor-operated valve according to claim 2, wherein the motor-operated valve includes the flat surface that is continuous with a curved surface. 5. The curvature radius of the first curved surface and the third curved surface is smaller than the radius of the can, and the radius of curvature of the second curved surface is larger than the radius of the can. The motor-operated valve according to claim 4, wherein 6. The motor-operated valve according to claim 1, wherein the rotor includes a spring, and the spring has a flat portion in contact with the bottom of the can.