JP4224187B2 - Motorized valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric valve used by being incorporated in an air conditioner, a refrigerator, or the like, and more particularly to an electric valve that can achieve downsizing.
[0002]
[Prior art]
Conventionally, an electric valve used by being incorporated in this type of air conditioner, refrigerator, etc. is a device that adjusts the flow rate of a fluid such as a refrigerant, and usually includes a valve body having a valve chamber and a valve seat, A cylindrical can with a bottom fixed to the upper part of the valve body through a hook-shaped portion, and a rotor is built inside the can, and an insertion hole is formed in the center portion outside the can. The stator which has is externally fitted.
[0003]
FIG. 8 is a longitudinal sectional view of the conventional motor-operated valve 1 as described above. The valve body 2 includes a valve chamber 2c, a guide bush fixing portion 2d, and a can fixing portion 2e. A fluid outflow pipe 2a and a fluid inflow pipe 2b through which a fluid such as a refrigerant enters and exits are provided, and a valve seat 2f to which a needle valve, which is a valve body 3a formed at the tip of the valve shaft 3, contacts and separates is disposed. It is installed.
[0004]
The guide bush fixing portion 2d is located above the valve chamber, and fixes the valve body 2 and the guide bush 4. A female screw portion 4a is formed on the inner periphery of the guide bush 4, and a male screw portion 5a formed on the outer periphery of the valve shaft holder 5 is screwed into the female screw portion 4a. A screw feed mechanism is formed by the female screw portion and the male screw portion. Is configured. And in this valve-shaft holder 5, the valve shaft 3 which forms the valve body 3a in the lower end part is inserted so that sliding is possible, and this valve-shaft 3 is shrink | fitted in the valve-shaft holder 5 inside. It is always urged downward by the compression coil spring 3b.
[0005]
The can fixing portion 2e is located at the upper end of the valve body 2 and is composed of a ring-shaped metal plate whose inner peripheral surface is fixed by caulking and whose lower end surface is joined by welding. The can 6 is fixed to the valve body 2 by welding to the valve body. The valve shaft 3 and the rotor 7 are coupled by externally fitting a sleeve 5a formed integrally with the valve shaft holder 5 to the valve shaft 3 and by internally fitting the sleeve 5a to the rotor 7 with a permanent magnet. . A push nut 3 c is press-fitted and fixed to the upper end of the valve shaft 3, and its flange portion is coupled to the rotor 7 while allowing the valve shaft 3 to move slightly up and down. The upper limit of the upward movement of the valve shaft 3 and the rotor 7 is performed by contact between a spring 7 b provided on the upper portion of the rotor 7 and the inner surface of the can 6. The lower stopper 4b fixed to the valve shaft holder 5 and the upper stopper 5b formed on the sleeve 5a constitute a stopper mechanism.
[0006]
A rotor 7 is built in the can 6, and a stator 8 is fitted on the outside of the can 6. A stator coil 8 a and a yoke 8 b are stored in the stator 8 in the vertical direction, and the stator coil 8 a is energized through a lead wire 8 c and a connector 8 d provided on the outer periphery of the stator 8. The yoke 8b is excited by energization of the stator coil 8a to rotate the rotor 7, and the valve shaft holder 5 and the valve shaft 3 are slid by a screw feed mechanism to open and close the valve body 3a to adjust the flow rate of the refrigerant. Is going. A connector cover 8 e is bonded to the stator 8.
[0007]
A metal ring-shaped mounting plate 9 is fixed below the stator 8, and an anti-rotation piece 9 a formed integrally with the mounting plate 9 is engaged with a fluid outflow pipe 2 a that protrudes horizontally from the valve body 2. The engagement hole 9b is engaged with one side of the ring-shaped welded portion between the valve body 2 and the can 6 and a pressing piece 9c formed integrally with the mounting plate 9 is pressed on the other side of the ring-shaped welded portion. Thus, the stator 8 is fixed.
[0008]
[Problems to be solved by the invention]
By the way, in the motor-operated valve 1 described above, the internal thread portion 4a on the inner periphery of the guide bush 4 for sliding the valve shaft 3 and the valve shaft holder 5 and the external thread portion 5a on the outer periphery of the valve shaft holder 5 are positioned below the rotor. However, there has been a problem that the overall length of the can and the outer diameter of the valve body are increased and the size is increased. And since the internal thread part 4a and the external thread part 5a are located under the rotor 3, and the rotor is rotationally driven by the downward screw feed mechanism, there existed a problem that the rotor 3 was easily shaken by rotation.
[0009]
Further, since the stopper mechanism for restricting the rotation of the rotor 3 is similarly located below the rotor 3, a space is created in the outer peripheral portions of 5b and 4b in FIG. Further, when the upper stopper 5b that rotates together with the valve shaft holder 5 is engaged with the lower stopper 4b, there is a problem that the rotor 3 is easily inclined.
[0010]
The present invention has been made in view of such problems. The object of the present invention is to reduce the overall length of the can and the valve body and to stabilize the rotation of the rotor, and the rotor is regulated by the stopper mechanism. Another object of the present invention is to provide a motor-operated valve that can be manufactured at a low cost because its operation is stable without tilting the rotor.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a valve body that adjusts the flow rate by a valve body that contacts and separates the valve seat in the valve chamber by a valve shaft, and the valve body that is fixed to the valve body and contacts and separates the valve body In a motor-operated valve comprising a can with a built-in rotor and a stator that is externally fitted to the can and rotationally drives the rotor, the drive mechanism that contacts and separates the valve body from the valve body in the rotor direction. A screw feed mechanism comprising a guide bush extending and fixed to form a fixed screw portion, and a valve shaft holder having a moving screw portion that supports the rotor and is screwed to the fixed screw portion of the guide bush. The valve shaft holder and the upper end of the rotor are fixed by caulking through a support ring, and the support ring is an electric valve having a groove on the outer periphery of the caulking fixing portion .
[0012]
Then, the present invention, the the valve shaft holder and the upper end of the rotor fixed by caulking through the support ring, the support ring Ru said electric valve der having a recess on the inner peripheral portion of the ring.
[0013]
Further, the present invention, the caulking fixation Ru Ah in the electric valve performed by the spinning caulking.
[0014]
Furthermore, the present invention, the screw feed mechanism Ru said electric valve der located within the rotor.
[0015]
Furthermore, Oite the present invention, a push nut that connects the valve shaft holder and the valve shaft is secured to the upper end of the valve shaft, and a cylindrical helical compression spring on the outer periphery of the push nut A return spring is attached, and when the fixing screw portion of the guide bush and the moving screw portion of the valve shaft holder are disengaged, the return spring abuts against the inner surface of the can and urges it to return the screw engagement, The return spring preferably has a tightly wound portion and is attached to the outer periphery of the push nut at the tightly wound portion. The return spring has a straight portion extending from one end to the center of the winding portion, and the return spring is attached by inserting the straight portion into a slit formed in a valve shaft to which a push nut is fixed. It is preferable that
[0016]
In the motor-operated valve configured as described above, since the screw feed mechanism is disposed in the rotor, the overall length of the can and the outer diameter of the valve body are reduced, and the motor-operated valve can be reduced in size. When the rotor is rotated by energizing and exciting the stator, the screw feed mechanism for supporting and driving the rotor is disposed in the rotor, so that the rotation of the rotor is stable and the rotor is less likely to swing with respect to the rotating shaft.
[0017]
Incidentally, by disposing the stopper mechanism in the rotor, be stopped moving the stopper is engaged with the rotor with respect to the fixed stopper, less likely to be stopped with the rotor is tilted, by reversing the rotor valve Even when the mouth is opened, the rotation can be resumed stably. If the fixed stopper and the moving stopper have the same shape, the cost can be reduced by manufacturing the stopper alone and then assembling it into the feed screw and the valve holder by a method such as press fitting.
[0018]
In the present invention, the valve shaft holder and the upper end of the rotor are caulked and fixed via a support ring, and the support ring is configured to have a groove on the outer periphery of the caulking fixing part. The generated stress does not directly act on the rotor, the rotor quality can be stabilized, and the long-term reliability of the rotor can be improved.
[0019]
Further, in the present invention , the caulking load can be reduced by using spinning caulking as the caulking fixation, and the deformation due to creep generated in the rotor 30 and the crack generated in the rotor 30 can be reduced without providing the groove. Can be prevented.
[0020]
Furthermore, the valve shaft holder and the upper end of the rotor are caulked and fixed via a support ring, and the support ring has a recess formed on the inner peripheral side thereof. The biting force between the support ring 65 and the valve shaft holder 32 can be further improved.
[0021]
Cost reduction can be achieved by attaching a return spring consisting of a cylindrical compression coil spring to the outer periphery of the push nut fixed to the upper end of the valve shaft. The return spring is attached to the outer periphery of the push nut at the tightly wound part. By being configured to be connected, the posture of the return spring is stable even when the motorized valve is inverted during transportation or the like, and no prisoners fall off.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the position embodiment of the electric valve of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of an embodiment of a motor-operated valve according to the present invention. The motor-operated valve 10 includes a valve body 20 that adjusts the flow rate of refrigerant through a valve body 23 that contacts and separates from a valve seat 22 in the valve chamber 21, and a rotor 30 that is fixed to the valve body 20 and contacts and separates the valve body 23. And a stator 50 that is externally fitted to the can 40 and rotationally drives the rotor 30. The rotor 30 and the stator 50 constitute a stepping motor.
[0023]
The can 40 has a bottomed cylindrical shape formed of a non-magnetic metal such as stainless steel, and is fixed to a stainless steel flange 41 fixed to the upper part of the valve body 20 by welding or the like, and the inside is airtight. It is kept in. The stator 50 includes a yoke 51 made of a magnetic material and upper and lower stator coils 53, 53 wound around the yoke 51 via a bobbin 52, and a fitting hole 50 a that fits outside the can 40 is formed. Has been.
[0024]
A valve body 23 composed of a needle valve is formed at the lower end of a brass valve shaft 24. A driving mechanism for bringing the valve body 23 into contact with and separating from the valve seat 22 includes a cylindrical guide bush 26 that extends from the valve body 20 toward the rotor 30 and is fixed to form a fixing screw portion 25, and fixing the guide bush 26. This is a screw feed mechanism including a valve shaft holder 32 having a moving screw portion 31 that is screwed into the screw portion 25, and the screw feed mechanism is disposed at a substantially central portion of the entire length in the axial direction in the rotor 30.
[0025]
For this reason, the axial length and the outer diameter of the valve body can be greatly reduced compared to the conventional motorized valve in which the screw feed mechanism is located below the rotor, and the motorized valve can be made smaller. Can be achieved. The fixed screw portion 25 is constituted by a male screw on the outer periphery of the guide bush 26, and the moving screw portion 31 is constituted by a female screw on the inner periphery of the valve shaft holder 32. The guide bush 26 and the valve shaft holder 32 are both formed from a brass cylindrical material.
[0026]
The valve shaft holder 32 has a cylindrical shape with a lower opening located outside the guide bush 26, and the moving screw portion 31 is formed on the inner surface as described above, and the valve shaft holder 32 has the valve shaft 24 at the center thereof. The upper reduced diameter portion is fitted and connected by a push nut 33. The valve shaft 24 formed at the lower end of the valve body 23 is made of brass, and is fitted into the center of the valve shaft holder 32 so as to be movable up and down, and is always provided by a compression coil spring 34 that is retracted in the valve shaft holder 32. It is biased downward. A pressure equalizing hole 32 a for equalizing the pressure in the valve chamber 21 and the can 40 is formed on the side surface of the guide bush 26.
[0027]
A return spring 35 composed of a cylindrical compression coil spring is attached to the outer periphery of a push nut 33 that is press-fitted and fixed to the upper end of the valve shaft 24, and a fixed screw portion 25 of the guide bush 26 and a moving screw portion 31 of the valve shaft holder 32. When the screw is disengaged, the return spring 35 abuts on the inner surface of the can 40 and urges the screwing of the fixed screw portion 25 and the moving screw portion 31 to return. The return spring 35 may be attached in a state of being loosely fitted and placed on the outer periphery of the push nut 33, or may be attached so as to elastically contact the outer periphery of the push nut.
[0028]
The valve body 20 is made of a metal such as brass, and is joined to the can 40 by butt welding the end of the can to the stepped portion of the bowl-like plate 41 fixed to the valve body 20 by welding or the like. . Not only butt welding, but also the end of the can 40 may be bent flat on the outer periphery to form a bowl-like part, and the bowl-like part and the bowl-like plate 41 may be fixed by so-called worship welding.
[0029]
The valve shaft holder 32 and the rotor 30 are coupled via a support ring 36, and the support ring 36 is constituted by a brass metal ring inserted when the rotor 30 is formed in this embodiment. The upper protrusion of the valve shaft holder 32 is fitted in the inner peripheral hole portion of the support ring 36, and the rotor 30, the support ring 36, and the valve shaft holder 32 are joined by caulking and fixing the outer periphery of the protrusion. The valve body 20, the valve shaft 24, the guide bush 26, the valve shaft holder 32, and the support ring 36 are all made of brass as described above, and are configured in consideration of recycling. Furthermore, since each component is connected by press fitting and caulking, for example, the caulking of the valve shaft holder 32 and the support ring can be removed to reuse the rotor. Of course, metals other than brass, such as stainless steel, can be used. Of course, metals other than brass, such as stainless steel, can be used only for the valve shaft 24.
[0030]
A lower stopper body (fixed stopper) 27 constituting one of the stopper mechanisms is fixed to the guide bush 26. The lower stopper body 27 is made of a ring-shaped plastic, and a plate-like lower stopper piece 27a projects upward. It is installed. Further, an upper stopper body (moving stopper) 37 constituting the other of the stopper mechanism is fixed to the valve shaft holder 32, and the upper stopper body 37 is also made of a ring-shaped plastic and has a plate-like upper side facing downward. A stopper piece 37a is provided so as to be engaged with the lower stopper piece 27a.
[0031]
The lower stopper body 27 is fixed to the spiral groove portion 26a formed on the outer periphery of the guide bush 26 by injection molding, and the upper stopper body 37 is fixed to the spiral groove portion 32b formed on the outer periphery of the valve shaft holder 32 by injection molding. ing. Needless to say, the lower stopper body 27 and the upper stopper body 37 may be fixed not only by injection molding but also by adhesion, press fitting, or the like.
[0032]
A plurality of lead terminals 54 connected to the stator coils 53, 53 protrude from the stator 50, and a connector 56 having a plurality of lead wires 55 connected thereto is connected to the lead terminals. A cover 57 covering the connector 56 is welded to the stator 50, and the inside of the cover 57 is filled with a filler 58 such as silicone resin or epoxy resin.
[0033]
The stator 50 has a fitting hole 50a having a lower surface opening at the center. The can 40 is fitted into the fitting hole, and is fixed to the valve body 20 and the can 40 by a detent member 59 welded to the lower surface of the stator 50. The The rotation preventing member 59 is fixed by crushing the protrusion 50b of the stator 50 with an ultrasonic welder or the like, and the vertical fluid inflow pipe 20a and the horizontal fluid outflow pipe 20b are extended from the valve body 20 to prevent rotation. The stator 50 is fixed to the valve body 20 and the can 40 by holding the fluid outflow pipe 20 b by the two arms of the member 59.
[0034]
The operation of the motor-operated valve 10 configured as described above will be described. When the stator coils 53, 53 are energized and excited in one direction, the rotor 30 and the valve shaft holder 32 are rotated with respect to the guide bush 26 fixed to the valve body 20, and the fixing screw portion 25 of the guide bush 26 and the valve shaft holder are rotated. For example, the valve shaft holder 32 is moved downward by the screw feed mechanism with the moving screw portion 31 of 32, the valve body 23 is seated and pressed against the valve seat 22, and the valve port is closed.
[0035]
When the valve port is closed, the upper stopper body 37 has not yet contacted the lower stopper body 27, and the rotor 30 and the valve shaft holder 32 are further rotated and lowered while the valve body 23 closes the valve port. At this time, since the valve shaft holder 32 is lowered with respect to the valve shaft 24, the downward force of the valve shaft holder 32 is absorbed by the compression coil spring 34 being compressed. Thereafter, when the rotor 30 further rotates and the valve shaft holder 32 is lowered, the stopper piece 37a of the upper stopper body 37 comes into contact with the stopper piece 27a of the lower stopper body 27, and energization to the stator coils 53 and 53 is continued. The descent of the valve shaft holder 32 is forcibly stopped.
[0036]
Since the stopper mechanism composed of the upper stopper body 37 and the lower stopper body 27 is disposed within the entire axial length of the rotor 30, the rotor 30 and the valve shaft holder 32 are not affected even when the stopper mechanism is functioning. The operation is stable with little tilting, and smooth operation is possible even when the rotor 30 is rotated in the reverse direction.
[0037]
When the stator coils 53, 53 are energized in the other direction and excited, the rotor 30 and the valve shaft holder 32 are rotated in the opposite direction to the guide bush 26 fixed to the valve body 20, and the fixing screw portion of the guide bush 26 is fixed. 25 and the moving screw portion 31 of the valve shaft holder 32, this time, the valve shaft holder 32 moves upward, the valve body 23 at the lower end of the valve shaft 24 moves away from the valve seat 22, and the valve port opens. The refrigerant can pass through the valve port. And the passage amount of a refrigerant | coolant can be adjusted with the rotation amount of the rotor 30, and since the rotation amount of a rotor is regulated by the number of pulses, an exact adjustment can be performed.
[0038]
Thus, the rotor 30 rotates, and the rotor 30, the valve shaft holder 32, and the valve shaft 24 slide in the axial direction by the screw feed mechanism of the fixed screw portion 25 of the guide bush 26 and the moving screw portion 31 of the valve shaft holder 32. However, since the screw feed mechanism is located particularly in the center of the rotor 30 and the rotor 30 is supported and driven within the entire length of the rotor 30, the rotor 30 does not shake during rotation and rotates stably. Can be made.
[0039]
Next, another embodiment of the present invention will be described. FIG. 2 is a longitudinal sectional view of another embodiment of the electric valve according to the present invention. This embodiment is different from the above-described embodiment in that the fixed stopper and the moving stopper have the same shape, so this point will be described in detail, and other substantially equivalent configurations will be denoted by the same reference numerals. Detailed description will be omitted.
[0040]
The lower stopper body 60, which is a fixed stopper, has a stopper piece that protrudes upward from a ring-shaped portion fixed to the guide bush 26. Moreover, the upper stopper body 61 which is a movement stopper has a stopper piece protruding downward from the valve shaft holder 32, and the lower stopper body 60 and the upper stopper body 61 have the same shape. The lower stopper body 60 and the upper stopper body 61 are fixed to the guide bush 26 and the valve shaft holder 32 by adhesion or press fitting, respectively, or are fixed by insert molding. In this example, since the lower stopper body 60 and the upper stopper body 61 are supplied as common parts, the number of molds can be reduced and the cost can be reduced.
[0041]
With reference to FIG. 3, another embodiment of the structure for fixing the valve shaft holder and the rotor will be described. 3A and 3B are cross-sectional views of the main part, in which FIG. 3A shows a state before caulking, and FIG. 3B shows a state after caulking. The valve shaft holder 32 and the upper end portion of the rotor 30 are fixed by caulking through a support ring 65 that is insert-molded in the rotor 30, and the support ring 65 has a circular groove 65a on the outer periphery of the caulking fixing portion. With this configuration, outward stress generated in the support ring 65 when the upper protrusion of the valve shaft holder 32 is caulked and deformed in the outer circumferential direction is absorbed by the groove 65a and affects the rotor 30. No, the rotor 30 is not deformed or cracked by creep.
[0042]
In addition, since the caulking load can be reduced by adopting spinning caulking for the caulking fixing, it is possible to prevent creep and deformation of the rotor 30 and to prevent cracks occurring in the rotor 30. Can be prevented. Therefore, the use of spinning caulking eliminates the need for the groove 65b as shown in the cross-sectional view of the main part of the motor-operated valve shown in FIG. 3C, which shows another state after caulking. Moreover, the fastening force between the support ring 65 and the valve shaft holder 32 can be further improved by the spinning caulking. In FIG. 3C, the can 40, the compression coil spring, and the like are omitted.
[0043]
Moreover, in this invention, it is possible to improve the said fastening force further not only in the said embodiment. That is, the structure of the support ring 65 is provided with an appropriate number of recesses 65b on the inner peripheral side of the support ring 65 as shown in the plan view of FIG. By performing spinning caulking, as shown in FIG. 4B, the caulking portion of the valve shaft holder 32 (shown by the hatched portion in the drawing) is made to be hard to be inserted into the four concave portions, thereby forming the biting portion 32a. Thus, the fastening force between the support ring 65 and the valve shaft holder 32 can be further improved.
[0044]
With reference to FIG. 5, still another embodiment of the structure for fixing the valve shaft holder and the rotor will be described. FIG. 5 is a cross-sectional view of the main part. The valve shaft holder 32 and the upper end portion of the rotor 30 are press-fitted and fixed via a support ring 66 insert-molded in the rotor 30 having a circumferential bent portion 66a in the middle. With this configuration, when the upper protrusion of the valve shaft holder 32 is caulked and deformed in the outer circumferential direction, the outward stress F generated by press-fitting into the support ring 66 is caused by deformation of the bent portion 66a. It is absorbed and hardly affects the rotor 30 as in the embodiment of FIG. 3, and the rotor 30 can be prevented from being deformed by creep or cracking.
[0045]
With reference to FIG. 6, another embodiment of the return spring will be described. 6A and 6B are cross-sectional views of the main part of the motor-operated valve showing another embodiment of the return spring. FIG. 6A shows a normal state, and FIG. 6B shows a state where the return spring has moved. The return spring 67 has a tightly wound part 67 a at the lower part attached to the push nut 33. The tightly wound portion 67 a is formed by closely contacting about 5 turns, and is fitted and attached to the outer periphery of the push nut 33. With this configuration, even if the motor-operated valve 10 is reversed during transportation and the return spring 67 moves so as to contact the inner surface of the can 40, the return spring 67 is pushed by the tightly wound portion 67a. Since it is stably guided by the nut 33, it is not tilted only by moving in the axial direction and does not fall off.
[0046]
Still another embodiment of the return spring will be described with reference to FIG. FIG. 7 is a cross-sectional view of an essential part of a motor-operated valve showing still another embodiment of the return spring. The return spring 68 has a straight portion 68a that extends from one end to the center of the winding portion, and the return spring 68 is a slit formed in the axial direction along the center of the upper end of the valve shaft 24 to which the push nut 33 is fixed. The straight part 68a is inserted and attached to 24a.
[0047]
With this configuration, even if the motor-operated valve 10 is inverted during transportation and the return spring 68 moves so as to contact the inner surface of the can 40, the return spring 68 has a straight portion 68a formed by the slit 24a. Because it is guided, it will not tilt and will not fall off.
[0048]
In each of the embodiments described above, a male screw is formed on the fixed screw portion of the guide bush and a female screw is formed on the moving screw portion of the valve shaft holder. However, a female screw is formed on the fixed screw portion, and a male screw is formed on the moving screw portion. Of course, it may be formed.
[0049]
【The invention's effect】
As can be understood from the above description, the motor-operated valve of the present invention can be reduced in size because the overall length can be shortened. Further, the rotation of the rotor that opens and closes the valve opening can be stabilized, and even when the rotor is regulated by the stopper, the rotor is less inclined and can be operated stably.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of a motor-operated valve according to the present invention.
FIG. 2 is a longitudinal sectional view of another embodiment of a motor-operated valve according to the present invention.
FIGS. 3A and 3B show another embodiment of the structure for fixing the valve shaft holder and the rotor, wherein FIG. 3A is a cross-sectional view of the main part of the motor-operated valve showing a state before caulking, and FIG. 3B is a state after caulking; Sectional drawing of the principal part of the motor operated valve which shows the other state after crimping.
4A and 4B show still another embodiment of the structure for fixing the valve shaft holder and the rotor, FIG. 4A is a plan view showing the structure of the support ring, and FIG. 4B is a diagram illustrating the caulking state of the support ring and the valve shaft holder. Plan view.
FIG. 5 is a cross-sectional view of an essential part of an electric valve showing still another embodiment of a structure for fixing a valve shaft holder and a rotor.
FIGS. 6A and 6B show another embodiment of the return spring, where FIG. 6A is a cross-sectional view of the main part of the motor-operated valve showing a normal state and FIG.
FIG. 7 is a cross-sectional view of an essential part of a motor-operated valve showing still another embodiment of the return spring.
FIG. 8 is a longitudinal sectional view of a conventional motor operated valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Motorized valve 20 Valve body 21 Valve chamber 22 Valve seat 23 Valve body 24 Valve shaft 24a Slit 25 Fixing screw part 26 Guide bush 27, 60 Lower stopper 30 Rotor 31 Moving screw part 32 Valve shaft holder 33 Push nut 34 Compression coil spring 35, 67, 68 Return springs 36, 65, 66 Support rings 37, 61 Upper stopper body 40 Can 50 Stator 65a Groove portion 66a Bending portion 67a Contact winding line 68a Linear portion

Claims (4)

A valve body that adjusts the passage flow rate with a valve body that contacts and separates from the valve seat in the valve chamber by a valve shaft; a can that includes a rotor that is fixed to the valve body and that contacts and separates the valve body from the valve seat; and In the motor-operated valve provided with a stator that is externally fitted and rotationally drives the rotor,
The drive mechanism that contacts and separates the valve body from the valve seat includes a guide bush that extends from the valve body toward the rotor and is fixed to form a fixing screw portion, and a fixing screw portion of the guide bush that supports the rotor and supports the rotor. A screw feed mechanism comprising a valve shaft holder having a moving screw portion to be screwed, wherein the valve shaft holder and the upper end of the rotor are caulked and fixed via a support ring, and the support ring is a caulking fixing portion. An electrically operated valve having a groove on the outer periphery . The motor-operated valve according to claim 1, wherein the valve shaft holder and the upper end portion of the rotor are fixed by caulking through a support ring, and the support ring has a recess in an inner peripheral portion of the ring . 3. The motor-operated valve according to claim 2, wherein the caulking is performed by spinning caulking . The motor-operated valve according to claim 1, wherein the screw feed mechanism is located in the rotor .

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