JP2004308835A - Motor operated valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide wholly miniaturized profile and simplified construction and reduce manufacturing cost. <P>SOLUTION: This motor operated valve comprises a valve element 15 to be put into separation from or contact with a seat portion 12d in a valve chest only by the rotating motion of a rotating shaft 21 to be rotationally driven by a stepping motor. The valve element 15 is put into separation from or contact with to the seat portion 12d in parallel to the rotating shaft 21. A valve holder 16 is supported slidably up and down by the rotating shaft 21 and the valve element 15 is mounted on the valve holder 16. The valve holder 16 is mounted on a lifter 18 fitted concentrically with the rotating shaft 21 and slidably on the rotating shaft 21. A stopper 19 is provided on the lifter 18 for restricting the up-and-down movement of the lifter 18. The stopper 19 as coil springs wound on the lifter 18 has a slider 20 arranged between the springs for up-and-down movement with the rotation of the rotor 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor-operated valve incorporated and used in a refrigeration cycle of an air conditioner, a refrigerator, and the like. The present invention relates to an electric valve including a valve body.
[0002]
[Prior art]
Conventionally, an electric valve used by being incorporated in a refrigeration cycle such as an air conditioner or a refrigerator of this type has a function of adjusting a flow rate of a fluid such as a refrigerant, and usually includes a valve chamber and a valve seat. It has a valve body and a bottomed cylindrical can fixed to the upper part of the valve body.A rotor driven by electromagnetic force is built inside the can, and a stepping motor together with the rotor is provided outside the can. Are externally fitted.
Conventionally, various types of such electric valves have been proposed, and for example, there are those disclosed in Patent Document 1, Patent Document 2, and Patent Document 3. FIG. 7 is a longitudinal sectional view showing the conventional motor-operated valve.
[0003]
This known motor-operated valve 1 includes a block-shaped valve body 4 that adjusts a flow rate of a refrigerant by a valve body 3 that is separated from and brought into contact with a valve seat 2c in a valve chamber 2, and a valve body 3 that is fixed to the valve body 4 and separated therefrom. A can 6 having a built-in rotor 5 to be brought into contact therewith, and a stator 8 which is fitted to the can 6 and which rotates the rotor 5 are provided. The rotor 5 and the stator 8 constitute a stepping motor. A valve element 3 is provided concentrically below the valve stem driven by the stepping motor. In addition, the lower and side portions of the valve body 4 are connected to the refrigerant outflow / inflow pipes 2a, 2b so as to communicate with the valve chamber 2, and both the outflow / inflow pipes 2a, 2b protrude in orthogonal directions.
[0004]
The can 6 has a bottomed cylindrical shape, and the inside is kept airtight. The stator 8 includes a yoke 8a made of a magnetic material, and upper and lower stators wound around the yoke 8a via bobbins 8b. And a coil 8c, and a fitting hole 8d that fits outside the can 6 is formed.
In the electric valve having such a configuration, the rotational motion of the rotor is transmitted to the valve stem, and the rotational motion of the valve stem is converted into a linear motion in which the valve stem moves up and down using a screw mechanism. Therefore, the valve stem performs a linear motion together with a rotational motion, and accordingly, the valve body comes into contact with and separates from the valve seat.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-220759
[Patent Document 2] Japanese Patent Application Laid-Open No. 2000-170942
[Patent Document 3] Japanese Utility Model Publication No. Sho 60-182577
[Problems to be solved by the invention]
The above-described various conventionally proposed motor-operated valves have the following problems. That is,
The conventional product has a problem that the valve seat may be worn and worn depending on the frequency because the valve body is repeatedly brought into and out of contact with the valve seat while rotating in synchronization with the drive screw of the screw mechanism. Further, since the shape of the valve body is a cylindrical shape having a block shape, the processing is complicated, and the processing cost is increased, and the economic efficiency may be deteriorated. In addition, since the inflow / outflow pipe on one side protrudes radially from the side of the cylindrical main body, it is not easy to hold the posture at the time of assembly (particularly brazing), which may cause a problem in assemblability and productivity.
[0009]
Therefore, in order to reduce the processing cost of the valve body and improve the economic efficiency, for example, when a brass material is used, it is necessary to separately provide a joint member for joining with the can. That is, if an attempt is made to use a material capable of ensuring airtightness such as TIG welding in order to omit this joint member, for example, SUS304, the workability deteriorates, the cost increases significantly, and the productivity and economic efficiency deteriorate. Occurs.
In order to efficiently convert rotational torque to axial force, that is, vertical movement, it is effective to make the screw size of the screw mechanism as small as possible. , The size of the drive screw is limited by the size of the valve body for convenience of assembly. That is, in order to make a large valve element, it is necessary to increase the screw size (large motor size) or use an expensive high magnetic force magnet, so that the electric valve cannot be downsized and the manufacturing cost increases. There was a problem.
[0010]
Therefore, the present invention has been made in view of the above-mentioned problems, and is excellent in productivity and economy and can be downsized in a motor-operated valve in which a valve body comes into contact with and separates from a seat portion by using a stepping motor. It is an object to provide a simple motorized valve.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a motor-operated valve according to the present invention has the following configuration. That is,
The motor-operated valve according to claim 1 includes a rotating shaft that is rotated by a stepping motor, and a valve body that is driven by the rotating shaft and comes into contact with and separates from a seat formed on a valve body. It is characterized by being moved up and down only by the rotational movement of.
According to a second aspect of the present invention, in the electric valve according to the first aspect, the valve body is disposed at a position lateral to the rotating shaft.
[0012]
With the electric valve according to the first and second aspects, the valve body does not come into contact with or separate from the valve seat while rotating in synchronization with the drive screw of the screw mechanism. The length of the motor-operated valve can be reduced. Further, the size of the screw of the screw mechanism can be reduced as much as possible in order to efficiently convert the rotational torque into an axial force, that is, a vertical movement.
[0013]
In other words, in the conventional product, since the valve body is arranged concentrically with the drive screw, the size of the drive screw is limited by the size of the valve body for convenience of assembly. In other words, in order to make the valve body large, it is necessary to increase the screw size (large motor size) or use a high magnetic force magnet, which makes it impossible to reduce the size of the motor-operated valve and increases the manufacturing cost. However, the present invention has solved this problem.
[0014]
According to a third aspect of the present invention, there is provided a motor-operated valve according to the first or second aspect, further comprising a valve holder supported by the rotating shaft, wherein the valve holder includes the valve body.
With such a feature, the position of the valve body with respect to the position of the rotating shaft can be set independently using the valve holder.
[0015]
According to a fourth aspect of the present invention, in the electric valve according to the third aspect, the valve holder is mounted on a lifter which is coaxial with the rotation shaft and is fitted to the rotation shaft so as to be vertically movable. It is characterized in that a stopper for regulating the vertical movement of the lifter is provided.
With such a feature, the configurations of the valve element and the stopper are simplified.
[0016]
According to a fifth aspect of the present invention, in the electric valve according to the fourth aspect, the stopper is disposed between the coiled spring and the coiled spring wound around the valve holder. And a slider that moves up and down by rotation.
With such a feature, the structure of the stopper is particularly simplified, and the operation of the stopper is buffered.
[0017]
According to a sixth aspect of the present invention, there is provided the electric valve according to any one of the third to fifth aspects, wherein the valve body is formed of a plate-like member.
With such a feature, conventionally, in order to reduce the processing cost of the valve body and improve the economic efficiency, for example, it is necessary to separately provide a joint member for joining with a can. If an attempt is made to use a material capable of ensuring airtightness, workability deteriorates, resulting in a significant increase in cost, and the problem of poor productivity and economic efficiency has arisen. However, the present invention has solved this problem.
[0018]
According to a seventh aspect of the present invention, in the electric valve according to the sixth aspect, the valve body includes a first fluid outflow / inflow pipe communicating with a seat hole formed by the seat portion; A second fluid inflow / outflow pipe communicating through a seat hole, wherein both the first and second fluid inflow / outflow pipes are provided so as to protrude from the valve body in the axial direction of the rotary shaft. I do.
With such a feature, the inflow / outflow pipe on one side does not protrude radially from the side of the columnar main body, so that the posture can be easily maintained during assembly, and the assemblability and productivity are improved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of a motor-operated valve according to the present invention in a closed state, FIG. 2 is a vertical cross-sectional view of the motor-operated valve in an open state, FIG. 3 is a plan view of a valve holder, and FIG. FIG. 5 is a front view of a stopper constituting the electric valve, and FIG. 5 is a front view of the spring receiving cup.
[0020]
(overall structure)
The motor-operated valve 10 according to the first embodiment of the present invention includes a valve body 12 and a rotation drive unit including a stepping motor including the stator 8 and the rotor 23.
(12 parts of valve body)
A first fluid inlet / outlet 12a and a second fluid inlet / outlet 12b are formed in the valve body 12 having a predetermined thickness and a substantially circular shape in a plan view, and a first outflow / inlet pipe 11a is formed in the first fluid inlet / outlet 12a. The second fluid inlet / outlet pipe 12b is connected to the second fluid inlet / outlet port 12b. The second fluid inlet / outlet 12b communicates with a sheet hole 12e described later. Further, a seat portion 12d is formed on the upper surface of the valve body 12 around the seat hole 12e.
[0021]
A bearing 12c having a concave upper surface is formed at the center of the valve body 12, and a second fluid inlet / outlet 12b is formed near the bearing 12c. A rod-shaped guide 17 having a predetermined length (height) is provided upright at a predetermined distance from the hole 12b. A can 26 is welded to the outer periphery of the upper surface of the valve body 12, and a lower end of a rotating shaft 21, which will be described later, is supported by the bearing 12c. A receiving recess 26 a is formed at the upper bottom of the can 26 so as to protrude upward so that the inside is concave, and a spring receiving cup for supporting the upper portion of the rotating shaft 21 via a bush 22 and a coil spring 24. 25 are arranged. As shown in FIG. 4, the spring receiving cup 25 has a substantially inverted cup shape, and a spherical convex portion 25b is formed on the upper bottom thereof so as to be supported by the receiving concave portion 26a. Is formed with a spring receiving step 25a.
[0022]
(Valve 15)
A feed screw 21a is formed on the outer periphery of the rotary shaft 21, and a cylindrical lifter 18 that moves up and down by the feed screw 21a is coaxially arranged by screw fitting. A rotor 23 is fixed to the upper part of the shaft 21 via a bush 22, and the rotating shaft 21 is disposed inside the rotor 23. A tongue piece 18a for caulking is formed below the lifter 18, and the peripheral edge of a shaft hole 16b formed in the valve holder 16 described later is caulked and fixed by the tongue piece 18a. Thus, the valve holder 16 is fixed below the lifter 18 in a direction perpendicular to the axial direction of the rotating shaft 21.
[0023]
As shown in FIG. 3, the valve holder 16 is formed of a flat plate-like body, and has a shaft hole 16b at the center thereof to which a lower portion of the lifter 18 is fixed by caulking. Further, two guide holes 16a are formed at the end of the valve holder 16.
As shown in FIGS. 1 and 2, the valve body 15 is composed of a cylindrical body 15b and a triangular pyramid 15c continuous with the cylindrical body 15b, and a tapered portion thereof forms a contact portion with the seat portion 12d. A tongue piece 15a for caulking is formed at the upper bottom of 15b. Then, the tongue piece 15a is inserted from below into a valve body hole 16c formed in the valve holder 16 and caulked around the periphery of the valve body hole 16c, so that the valve body 15 is fixed to the valve holder 16.
Therefore, the valve holder 16 is arranged in a state of extending outward around the rotation shaft 21 and the lifter 18, that is, in the lateral direction of the can 26. Thus, the position of the valve body 15 after being mounted in the valve body hole 16c is a position parallel to the rotation shaft 21 on the side of the rotation shaft 21.
It goes without saying that the position of the valve body 15 relative to the valve holder 16 after mounting is immediately above the seat hole 12e. A stopper hole 16d is formed at an appropriate position of the valve holder 16, for example, between the guide hole 16a and the shaft hole 16b.
[0024]
A stopper 19 made of a coiled spring is wound around the lifter 18 in a resilient state. As shown in FIG. 5, the stopper 19 has a lower portion extending downward to form a downward extending portion 19a, which is inserted into the stopper hole 16d, and an upper portion extending upward and extending upward. 19b is formed.
In the gap between the stoppers 19, for example, a slider 20 consisting of, for example, approximately one and a half turns is loosely fitted to the lifter 18, and one end of the slider 20 is extended outwardly as an extended portion 20a. It is arranged within the rotation locus of the formed ridge 23a.
[0025]
A rotor 23 is fixed to the upper part of the rotating shaft 21 via a bush 22. A coil spring 24 is compressed between the upper surface of the bush 22 and the spring receiving step 25a of the spring receiving cup 25. That is, the valve body 15 is pressed in the direction of the seat portion 12d. A rotor wire 29 is wound around a coil bobbin 27 via a stator yoke 32 on the outer surface of the can 26. The outer surface of the rotor wire 29 is covered with a tape 30, and a stator cover 33 is provided. I have. Note that reference numeral 28 in the figure is a terminal. On the inner peripheral surface of the rotor 23, a ridge 23a for rotating the slider 20 together with the rotating shaft 21 in parallel with the rotating shaft 21 is formed.
[0026]
With this configuration, when power is supplied through the terminal 28, the rotor 23 rotates, so that the rotating shaft 21 integrated with the rotor 23 also rotates, and the slider 20 also rotates. The lifter 18 whose rotation is restricted by the guide 17 via the feed screw 21a by the rotation of the rotating shaft 21 moves up and down. The valve body 15 integrated with the valve holder 16 fixed to the lifter 18 moves up and down with the seat portion 12d by the vertical movement of the lifter 18, and controls the amount of the refrigerant passing through the seat hole 12e.
Thus, the valve element 15 moves up and down only by the rotation of the rotary shaft 21 due to the rotation of the rotor 23 without the vertical movement of the rotary shaft 21, and the valve element 15 comes into contact with and separates from the seat portion 12d.
[0027]
The slider 20 is rotated by the rotation of the rotor 23 and moves up and down with respect to the stopper 19. However, in the state of FIG. Stop rotation. In the state shown in FIG. 2, the slider 20 moves to the lowermost position of the stopper 19 and comes into contact with the lower extension 19a of the stopper 19 to stop the rotation of the rotor 23.
[0028]
In the first embodiment, the above-described configuration, that is, the electric valve 10 is configured such that the rotating shaft 21 rotated by the stepping motor and the valve body that is driven by the rotating shaft 21 and comes into contact with and separates from the seat portion 12 d formed on the valve body 12. 15, the valve element 15 is moved up and down only by the rotational movement of the rotary shaft 21 and is disposed at a side position of the rotary shaft 21. Therefore, the valve element 15 rotates while synchronizing with the rotary shaft 21. The seat 12d is not separated from the seat 12d, so that the seat 12d is less likely to be worn and the length of the electric valve 10 can be reduced. Further, in order to efficiently convert the rotational torque into an axial force, that is, a vertical motion, the size of the screw of the rotary shaft 21 can be reduced as much as possible.
[0029]
In other words, in the conventional product, since the valve body is arranged concentrically with the drive screw, the size of the drive screw is limited by the size of the valve body for convenience of assembly. That is, in order to make the valve body 15 large, it is necessary to increase the screw size or use a high magnetic force magnet, and therefore, there is a problem that the electric valve cannot be downsized and the manufacturing cost increases. The present invention has solved this problem.
[0030]
In addition, a valve holder 16 supported on the rotating shaft 21 is provided, and the valve holder 16 is provided with the valve body 15, so that the position of the valve body 15 is independent of the position of the rotating shaft 21 using the valve holder 16. Can be set manually. Further, the valve holder 16 is mounted on a lifter 18 which is concentric with the rotation shaft 21 and is fitted to the rotation shaft 21 so as to be vertically movable, and the lifter 18 has a stopper 19 for regulating the vertical movement of the lifter 18. Is provided, the configuration of the valve body 15 and the stopper 19 is simplified. In addition, since the stopper 19 is formed of a coil spring, its stopping action is buffering and does not apply an impact force to the entire movable part, so that the durability of the electric valve 10 can be improved.
[0031]
Further, the stopper 19 is composed of a coil-shaped spring wound around the valve holder 16 and a slider 20 disposed between the springs and moved up and down by the rotation of the rotor 23, so that the configuration of the stopper 19 is simplified. And the effect becomes buffered.
[0032]
In addition, since the valve body 12 is formed of a plate-like member, conventionally, in order to reduce the processing cost of the valve body 12 and improve economical efficiency, for example, a joint member for joining with the can 26 is used. There is no need to provide a separate device, which makes it easier to secure airtightness and improves productivity and economy.
[0033]
The valve body 12 has a first fluid inflow / outflow pipe 11a communicating with a seat hole 12a formed by the seat portion 12d, and a second fluid in communication with the first fluid outflow / inflow pipe 11a via the seat hole 12e. An outflow / inflow pipe 11b is provided. The first and second fluid outflow / inflow pipes 11a and 11b are both provided so as to protrude from the valve body 12 in the axial direction of the rotary shaft 21, so that one of the outflow / inflow pipes has a cylindrical shape. Does not protrude radially from the side of the valve body 12, it is easy to hold the posture at the time of assembling, and the assemblability and productivity are improved.
[0034]
Embodiment 2
Next, a second embodiment will be described with reference to the drawings. FIG. 6 shows a vertical cross-sectional view of a motor-operated valve 10 'according to the second embodiment in a closed state. In the second embodiment, since the shapes are different from those of the seat portion 12d and the bearing portion 12c of the first embodiment, the same components are denoted by the same reference numerals as those in FIGS. The second embodiment is different from the second embodiment in that the bearing 13 supporting the lower part of the rotary shaft 21 is arranged separately from the valve body 12 and the seat 14 is formed as a member separate from the valve body 12. Different. The seat 14 is formed with a tapered seat hole 14a, and the cross-sectional area of the seat hole 14a is changed by the contact and separation of the valve body 15 with the seat 14.
[0035]
With the above configuration, in addition to the operation and effect of the motor-operated valve 10 ′ of the first embodiment, the bearing 13, which is in sliding contact with the rotating shaft 21, and the seat 14, which is in contact with the valve element 15, are provided separately. By forming the valve body, the processing of the valve body can be facilitated, and these materials can be appropriately selected, and the durability can be improved.
[0036]
【The invention's effect】
As can be understood from the above description, according to the present invention, it is possible to realize the miniaturization of the overall shape of the motor-operated valve, the simplification of the configuration, and the reduction of the manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a motor-operated valve according to a first embodiment of the present invention in a closed state.
FIG. 2 is a longitudinal sectional view of the electric valve in an open state.
FIG. 3 is a plan view of a valve holder that constitutes the electric valve.
FIG. 4 is a front view (A) and a vertical cross-sectional view (B) of a spring receiving cup constituting the electric valve.
FIG. 5 is a front view of a stopper constituting the electric valve.
FIG. 6 is a longitudinal sectional view of a motor-operated valve according to a second embodiment in a closed state.
FIG. 7 is a longitudinal sectional view of a motor-operated valve according to the related art.
[Explanation of symbols]
1..Electric valve (known)
2 ··· Valve 2a, 2b ··· Outflow / inlet pipe 2c ··· Valve seat 3 ··· Valve (valve stem)
4. Valve body 5. Rotor 6. Can 8. Stator 8a. Yoke 8b. Bobbin 8c .. Stator coil 8d .. Fitting holes 10, 10 '.. Electric valve (this invention)
11a 1st outflow / inflow pipe 11b 2nd outflow / inflow pipe 12 valve body 12a 1st fluid outflow / inlet hole 12b 2nd fluid outflow / inlet hole 12c bearing part 12d seat part 12e seat hole 13, bearing 14, seat 14a, seat hole 15, valve body 15a, tongue piece 15b (for caulking), cylindrical body 15c, triangular pyramid 16, valve holder 16a, guide hole 16b ··· Shaft hole 16c ··· Valve hole 16d ··· Stopper hole 17 ··· Guide 18 ··· Lifter 18a ··· Tongue 19 (for crimping) ··· Stopper 19a ··· Lower extension 19b ··· Extension Part 20 Slider 20a Extension 21 Rotary shaft 21a Feed screw 22 Bush 23 Rotor 23a Projection 24 Coil spring 25 Spring receiving cup 25a Spring receiving step Part 25b Part 26 .. canceller 26a ... receiving recess 27 ... coil bobbin 28 · terminals 29 · Rotawaiya 30 .. tape 32 · stearyl - Tayoku 33 ... stearyl - Takaba

Claims (7)

It comprises a rotating shaft that is rotated by a stepping motor, and a valve body that is driven by the rotating shaft and comes into contact with and separates from a seat portion formed on the valve body. The valve body is moved up and down only by the rotational motion of the rotating shaft. An electric valve characterized by the above. The motor-operated valve according to claim 1, wherein the valve element is disposed at a position lateral to the rotation shaft. The motor-operated valve according to claim 1, further comprising a valve holder supported on the rotating shaft, wherein the valve holder includes the valve body. The valve holder is mounted on a lifter which is coaxial with the rotation shaft and is vertically movably fitted to the rotation shaft, and the lifter is provided with a stopper for restricting vertical movement of the lifter. The motor-operated valve according to claim 3, wherein 5. The stopper according to claim 4, wherein the stopper comprises a coil spring wound around the valve holder, and a slider disposed between the coil springs and moved up and down by rotation of the rotor. Electric valve. The motor-operated valve according to any one of claims 3 to 5, wherein the valve body is formed of a plate-shaped member. The valve body includes a first fluid inflow / outflow pipe communicating with a seat hole formed by the seat portion, and a second fluid inflow / outflow pipe communicating with the first fluid outflow / inlet pipe via the seat hole. The motor-operated valve according to claim 6, wherein both the first and second fluid outflow / inflow pipes are provided so as to protrude from the valve body in the axial direction of the rotation shaft.

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