JP6228621B2 - Motorized valve - Google Patents

Description

  The present invention relates to an electric valve used for a refrigeration cycle or the like.

  Motorized valves used in large packaged air conditioners and refrigerators have a large diameter and high pressure difference due to rationalization of control equipment such as combining multiple motorized valves used for flow control into one. In addition, performance with good operability is desired.

However, the motor valve having a relatively large diameter has a large load on the valve body generated by the differential pressure with respect to the thrust of the screw generated by the torque of the magnet, and there is concern about the operability of the valve body.
Therefore, for example, in the motor-operated valve 1 of Patent Document 1 shown in FIG. 14, a stepped cylinder is provided between a dome-shaped can 37 in which the rotor 31 is accommodated and a cylindrical valve body 5 in which the valve chamber 7 is formed. The valve body guide member 14 is press-fitted from the lower side of FIG. 14 toward the step portion formed on the inner surface of the stepped cylindrical base base 13, and the valve body guide member is further interposed. A seal member 38 is mounted on the outer peripheral surface of the valve body 20 slidably in contact with the inner peripheral surface of the valve 14, and a back pressure chamber 29 is defined above the valve chamber 7 by the seal member 38 so that the pressure in the valve port is reduced. By introducing into the back pressure chamber 29 through the conduction path 24 provided in the valve body 20 and utilizing the pressure (back pressure) in the back pressure chamber 29, a push-down force that acts on the valve body 20 in the closed state. The differential pressure between (force acting in the valve closing direction) and push-up force (force acting in the valve opening direction) And Yanseru, and reduce the load on the valve body 20.

JP 2013-130271 A

  By the way, especially in the motor-operated valve 1 used for a large package air conditioner or refrigerator, in order to effectively use the pressure in the back pressure chamber 29, it is arranged in the valve element guide member 14 in the valve closed state of FIG. The first chamber 22 and the back pressure chamber 29 located on the outer side of the valve body 20 must be reliably separated by the sealing member 38.

  However, in the conventional motor-operated valve 1, the valve body guide member 14 that guides the movement of the valve body 20 in the vertical direction is simply press-fitted into the stepped hole of the stepped cylindrical base 13. The positioning of the valve body guide member 14 is unstable, the shaft center of the valve body guide member 14 and the valve body 20 is displaced, and the sealing performance between the valve body guide member 14 and the valve body 20 is impaired. There was a risk of it.

  If the axial center of the valve body guide member 14 and the valve body 20 is displaced, the sealing performance by the seal member 38 is impaired, and the first chamber 22 formed outside the valve body 20 and the back of the valve body 20 are not supported. Pressure leakage occurs between the pressure chamber 29 and, as a result, the operability of the valve body 20 may be significantly hindered.

In addition, even if such a problem is a case where back pressure is not utilized, if the axial center of a valve body guide member and a valve body has shifted | deviated, operativity may be inhibited largely.
Further, in the conventional motor-operated valve 1, a liquid pool is formed between the inner peripheral surface of the stepped cylindrical base 13 and the outer peripheral surface of the valve body guide member 14 press-fitted into the stepped cylindrical base 13. It is conceivable that a sealed space is formed.

  As described above, when a sealed space serving as a liquid pool is formed in the valve body 5, the refrigerant stays in the sealed space, and the retained refrigerant expands due to a temperature change and the valve body guide member 14. It is also conceivable that the operability of the valve body 20 may be adversely affected because the coaxiality of the valve body guide member 14 with respect to the stepped cylindrical base 13 is reduced.

  In view of such a conventional situation, the present invention, for example, in a motor-operated valve, a valve body guide member that guides the movement of the valve body is securely fixed to the valve body. It aims at providing the motor operated valve which can ensure the sealing between the 1st room located in the outward side, and a back pressure room.

  Furthermore, an object of the present invention is to provide a motor-operated valve in which there is no fear that the accumulated refrigerant expands due to a temperature change and deforms the valve body guide member in the valve body.

The motor-operated valve according to the present invention for achieving the above object is
A motor-operated valve that converts rotational movement of a rotor into linear movement by screw connection between a male screw member and a female screw member, and moves a valve body accommodated in the valve body in the axial direction based on the linear movement. ,
Of the male screw member and the female screw member, one screw member that is disposed so as not to move relative to the valve body, and a valve body guide member that guides the movement of the valve body in the axial direction, Consists of separate members ,
The outer peripheral surface on the upper opening side of the valve body guide member is closely locked to the inner peripheral surface of the valve body, and the outer peripheral surface on the upper opening side of the valve body guide member and the upper opening side of the valve body A gap is formed in the axial direction between the inner peripheral surface of
The motor-operated valve characterized in that the valve body guide member is integrated with an end face on the upper opening side of the valve body, or the valve body guide member is integrated with an inner peripheral surface of the valve body by a fixing means.

According to the motor-operated valve of the present invention having such a configuration, if the valve body guide member is reliably positioned at the time of assembly of the motor-operated valve, the shaft core is displaced between the valve body guide member and the valve body thereafter. It does not occur. Since the outer peripheral surface of the valve body guide member on the upper opening side is locked to the inner peripheral surface of the valve body, the valve body guide member can be easily positioned with respect to the valve body.

Further, if the gap is formed in the axial direction, a sealed space serving as a liquid pool is not formed between the valve element guide member and the valve body. Therefore, unlike the case where the sealed space is formed, there is no problem that the refrigerant stays in the sealed space and the retained refrigerant expands due to the temperature change and the valve body guide member is deformed.

  Furthermore, if such a gap is formed in the axial direction on the outer peripheral surface on the upper opening side of the valve element guide member, the contact area of the press-fitting portion of the valve element guide member as compared with the case where no gap is formed there Thus, the press-fit load between the valve element guide member and the valve body can be reduced.

Furthermore, in the electric valve according to the present invention, it is preferable that a seal member is interposed between the valve element guide member and the valve element.
If the seal member is interposed as described above, the first chamber formed outside the valve body and the back pressure chamber can be reliably sealed in the valve closed state.
Therefore, pressure leakage between the first chamber and the back pressure chamber can be prevented.

In the motor-operated valve according to the present invention, it is preferable that the fixing means is any one of welding, brazing, and adhesion.
Such a configuration is easy to work and can be manufactured industrially at low cost.

According to the electric valve of the present invention, the valve body guide member that guides the movement of the valve body in the axial direction can be reliably positioned and fixed with respect to the valve body.
Further, by forming a gap in the axial direction between the outer peripheral surface on the upper opening side of the valve body guide member and the inner peripheral surface on the upper opening side of the valve body, the gap between the valve body guide member and the valve main body is formed. An inadvertent liquid pool can be prevented from being formed.

Further, by providing such a gap, the contact area between the valve element guide member and the valve element can be reduced, and the press-fitting load of the valve element guide member can also be reduced.
Further, by interposing a seal member between the valve element guide member and the valve element, the sealing between the first chamber located on the outer side of the valve element and the back pressure chamber is ensured when the valve is closed. Can be.
In addition, the motor operated valve of the present invention is easy to work and can be manufactured industrially at a low cost.

FIG. 1 is a cross-sectional view of a motor-operated valve according to a first embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part of the first embodiment shown in FIG. FIG. 3 is an enlarged cross-sectional view of a main part of the motor-operated valve according to the second embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view of the main part of the motor-operated valve according to the third embodiment of the present invention. FIG. 5 is a cross-sectional view of another valve body guide member that replaces the valve body guide member shown in FIG. 1. FIG. 6 is a cross-sectional view taken along the line C-C ′ in FIG. 5. FIG. 7 is a view corresponding to FIG. 2 in the fourth embodiment of the present invention using the other valve element guide member shown in FIG. FIG. 8 is a view showing a modified example of the other valve element guide member shown in FIGS. 5 and 6 and corresponds to FIG. FIG. 9 is a view corresponding to FIG. 3 in the fifth embodiment of the present invention. FIG. 10 is a view corresponding to FIG. 4 in the sixth embodiment of the present invention. FIG. 11 is an enlarged sectional view of an essential part in the seventh embodiment of the present invention. FIG. 12 is an enlarged sectional view of a main part in the eighth embodiment of the present invention. FIG. 13 is a cross-sectional view of a motor operated valve according to the ninth embodiment of the present invention. FIG. 14 is a cross-sectional view of a conventional motor-operated valve disclosed in JP2013-130271A.

Hereinafter, preferred embodiments (examples) of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a motor-operated valve 2 according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing a main part of FIG.

In the present specification, “upper” or “lower” is defined in the state of FIG. That is, the rotor 4 is positioned above the valve body 17.
In the motor-operated valve 2, the valve main body 30 is integrally connected to a lower end portion on the opening side of a case 60 made of a non-magnetic material and having a cylindrical cup shape by welding or the like.

  Here, the valve main body 30 is a press-molded product manufactured by pressing a stainless steel plate, and has a valve chamber 11 therein. The valve body 30 is welded or brazed with a first copper pipe joint 12 that communicates directly with the valve chamber 11 and a second copper pipe joint 15 that communicates with the valve chamber 11 via the valve port 16. It is fixedly attached by attaching or bonding. The valve port 16 is not limited to being directly formed in the valve body 30 as shown in FIG. For example, a valve seat member in which the valve port 16 is formed may be prepared as a separate member, and this separate member may be incorporated into the valve body 30.

  The rotatable rotor 4 is accommodated in the inner periphery of the case 60, and the valve shaft 41 is disposed on the shaft core portion of the rotor 4 via the bush member 33. The valve shaft 41 and the rotor 4 coupled by the bush member 33 move integrally in the vertical direction while rotating. A male screw 41 a is formed on the outer peripheral surface near the middle portion of the valve shaft 41. In the present embodiment, the valve shaft 41 functions as a male screw member.

On the outer periphery of the case 60, a stator including a yoke, a bobbin, and a coil (not shown) is arranged, and the rotor 4 and the stator constitute a stepping motor.
A guide support 52 is fixed to the ceiling surface of the case 60. The guide support body 52 has a cylindrical portion 53 and an umbrella-shaped portion 54 formed on the upper end side of the cylindrical portion 53, and the whole is integrally formed by press working. The umbrella-shaped portion 54 is molded in substantially the same shape as the inside of the top portion of the case 60.

  The cylindrical portion 53 of the guide support body 52 is installed so as to be axially suspended from the center of the ceiling portion of the case 60 in a concentric state with the rotor 4. A positioning hole 57 is press-molded at the lower end of the cylindrical portion 53, and a cut-and-raised piece 58 is provided at the back of the positioning hole 57.

  The cylindrical portion 53 of the guide support 52 is provided with a spiral guide 59 formed in a coil spring shape by a wire having spring properties so as to surround the outer periphery of the cylindrical portion 53. The spiral guide 59 has a stopper portion 62 that extends in the axial direction at the lower end thereof.

  The spiral guide 59 abuts on a valve opening stopper projection 56 formed in the middle of the guide support 52 on the upper end side, and the stopper portion 62 on the lower end portion is inserted and fitted into the positioning hole 57 so that the tip of the stopper portion 62 is inserted. Is cut and raised by the elastic force of the spiral guide 59 and abuts against the piece 58.

Thus, the spiral guide 59 is sandwiched between the valve opening stopper projection 56 and the positioning hole 57 by the axial spring load, and the mounting position is determined without rattling.
A movable stopper member 63 is rotatably engaged with the spiral guide 59. The movable stopper member 63 is shaped like a one-turn coil spring.

  When the movable stopper member 63 is kicked by the rotation of the rotor 4, the movable stopper member 63 is guided by the spiral guide 59 while rotating and performs a spiral motion, and moves in the axial direction of the spiral guide 59. When the movable stopper member 63 abuts against the stopper portion 62 of the spiral guide 59, the further clockwise rotation proceeding downward is stopped, and the origin position of the rotor 4 is mechanically set based on the valve closing reference. Further, when the movable stopper member 63 abuts on the valve opening stopper projection 56, the further counterclockwise rotation proceeding upward is stopped, and the valve opening (fully opened) position is mechanically set.

  A cylindrical member 65 that also serves as a guide for the valve shaft 41 is fitted in the cylindrical portion 53 of the guide support 52. The cylindrical member 65 is made of a material containing a lubricant or a surface-treated part made of metal or synthetic resin, and rotatably holds the valve shaft 41.

Below, the principal part of a present Example is demonstrated.
At the abutting portion B between the lower end portion on the opening side of the case 60 and the upper end portion on the upper opening side of the valve body 30, as shown in an enlarged view in FIG. 2, the movement of the valve body 17 in the axial direction is guided. A valve element guide member 72 is disposed.

  As described above, the valve body guide member 72 for guiding the movement of the valve body 17 in the axial direction is a cylindrical body through which the inside penetrates, and the flange portion 72c positioned at the uppermost position and the large diameter portion 72a below the flange portion 72c. And a small-diameter portion 72b below it, and is formed by press molding. The diameter on the outer peripheral surface side of the large diameter portion 72 a of the valve body guide member 72 is slightly larger than the diameter on the inner peripheral surface side of the valve body 30. That is, by setting the dimensions in this way, when the valve body guide member 72 is press-fitted into the valve body 30, the large diameter portion 72 a of the valve body guide member 72 is closely related to the inner peripheral surface of the valve body 30. Therefore, the valve body guide member 72 does not move with respect to the valve main body 30. As a result, the coaxiality of the valve body guide member 72 with respect to the valve body 30 is improved, so that the controllability of the valve body 17 can also be improved. Further, since the valve body guide member 72 is press-fitted into the valve body 30, a useless space is not formed, and the motor-operated valve can be reduced in size.

  In this way, after the flange portion 72c of the valve body guide member 72 is disposed between the butted end portions of the case 60 and the valve body 30 as shown in FIG. 2, the lower end portion on the opening side of the case 60, The upper end portion on the opening side of the valve body 30 and the flange portion 72c of the valve element guide member 72 are integrated in a sealed state over the entire circumference by fixing means such as welding or brazing.

  Thus, the valve body guide member is integrally fixed between the lower end portion on the opening side of the case 60, the upper end portion on the opening side of the valve body 30, and the flange portion 72 c of the valve body guide member 72. The positioning and fixing of 72 is ensured. Therefore, after that, even if an impact or the like is applied, the axis of the valve element guide member 72 is not displaced.

  Further, in the butted portion B where welding, brazing, adhesion, or the like is performed, the first chamber 26 formed outside the valve body 17, the back formed by the valve body 17 and the valve shaft holder 6. The space between the pressure chamber 28 is securely sealed.

Such a sealed structure can prevent pressure leakage between the first chamber 26 and the back pressure chamber 28.
Although the main part of the first embodiment of the present invention has been described above, the configuration below the bush member 33 coupled to the valve shaft 41 will be briefly described below.

  Below the bush member 33 of the valve shaft 41, a valve shaft holder 6 that has a function of forming a screw coupling A with the valve shaft 41 and suppressing the inclination of the valve shaft 41 is described below. It is fixed so that it cannot rotate relative to 30.

  The valve shaft holder 6 includes an upper cylindrical small diameter portion 6a, a lower cylindrical large diameter portion 6b, a fitting portion 6c accommodated on the inner peripheral side of the valve body 30, and a ring-shaped flange portion 6f. Consists of. The flange portion 6f of the valve shaft holder 6 is fixed to the upper surface of the flange portion 72c of the valve element guide member 72 by welding, brazing, adhesion, or the like. Further, a through hole 6 h is formed inside the valve shaft holder 6.

  The cylindrical small-diameter portion 6a, the cylindrical large-diameter portion 6b, and the fitting portion 6c of the valve shaft holder 6 are integrally formed with a synthetic resin, for example, polyphenylene sulfide (PPS) having excellent injection moldability. Preferably it is. On the other hand, the flange portion 6f provided in the fitting portion 6c of the valve shaft holder 6 may be made of synthetic resin, but in the case of the present embodiment, it is made of metal, and this metal flange portion 6f is, for example, a valve shaft. The holder 6 is integrated with the fitting portion 6c side by insert molding. A female screw 6d is formed downward from the upper opening 6g of the cylindrical small diameter portion 6a of the valve shaft holder 6 to a predetermined depth.

The male screw 41a formed on the outer periphery of the valve shaft 41 and the female screw 6d formed on the inner periphery of the cylindrical small diameter portion 6a of the valve shaft holder 6 constitute a screw coupling A.
Further, a pressure equalizing hole 51 is formed in a side surface of the cylindrical large diameter portion 6b of the valve shaft holder 6, and the pressure equalizing hole 51 allows the valve shaft holder chamber 83 in the cylindrical large diameter portion 6b and the rotor to be formed. The accommodation chamber 67 (second back pressure chamber) communicates with it. By providing the pressure equalizing hole 51 as described above, the movement of the valve shaft holder 6 can be smoothly performed by communicating the space in which the rotor 4 of the case 60 is accommodated with the space in the valve shaft holder 6. it can.

  A cylindrical valve guide 18 is disposed on the lower end side of the valve shaft 41 so as to be slidable with respect to the through hole 6 h of the valve shaft holder 6. The valve guide 18 is bent at a substantially right angle on the ceiling 21 side by press molding. A through hole 18 a is formed in the ceiling portion 21.

On the other hand, a flange 41 b is formed at the lower end of the valve shaft 41.
The flange 41b of the valve shaft 41 is fitted in the through hole 18a of the valve guide 18 so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction. Further, since the flange 41b has a larger diameter than the through hole 18a of the valve guide 18, the valve shaft 41 is prevented from coming off.

  Since the valve shaft 41 and the valve guide 18 are movable in the radial direction with respect to each other, the valve guide 18 and the valve guide 18 and the valve shaft 41 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 is obtained.

  A washer 70 is installed between the ceiling portion 21 of the valve guide 18 and the flange portion 41 b of the valve shaft 41. The washer 70 is preferably a metal washer having a highly slippery surface, a highly slippery resin washer such as a fluororesin, or a metal washer having a highly slippery resin coating. A through hole is formed in the center of the washer 70.

The shaft portion of the valve shaft 41 located on the upper surface side of the washer 70 is penetrated so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction in a loosely fitted state.
Further, a compressed valve spring 27 and a spring receiver 35 are accommodated in the valve guide 18. The lower end of the valve guide 18 is fixed to the base portion side outer peripheral surface of the valve body 17 by welding, brazing, adhesion, or the like.

  On the other hand, the valve body 17 of the present embodiment is tapered from the lower end side to the upper end side in order to guide the pressure of the valve port 16 (in the second pipe joint 15) to the upper side (back side) of the valve body 17. A vertical hole 17b having a portion 17a is formed, and a horizontal conduction hole 17c is formed so as to cross the hole 17b.

  In this embodiment, a vertical hole 17 b and a horizontal conduction hole 17 c are provided in the valve body 17, and the valve port 16 (in the second pipe joint 15) passes through the valve body 17. Although the pressure is guided to the back pressure chamber 28 defined by the valve body guide member 72 and the valve body 17, the present invention is not limited to this.

  For example, when the thickness of the tubular portion of the valve body is relatively thick, such as a valve body formed by cutting instead of the thin valve body 30 of the tubular portion, the valve body Instead, a vertical passage is formed inside the thick valve body, and the passage provided in the tubular portion of the valve body serves as an introduction hole, and the second pipe joint 15 is formed on the upper side (back side) of the valve body. Can lead to pressure. Furthermore, a piping member that guides the pressure of the valve port 16 (in the second pipe joint 15) to the back pressure chamber 28 may be provided separately.

Thus, the passage for guiding the pressure in the second pipe joint 15 to the upper side (back side) of the valve body is not limited to the inside of the valve body 17.
In the present embodiment, the pressure in the valve port 16 (in the second pipe joint 15) is introduced into the back pressure chamber 28 by forming the lateral conduction hole 17 c in the valve body 17.

  Further, a seal member 48 is interposed between the valve body 17 and the valve body guide member 72. In this embodiment, an O-ring is adopted as the seal member 48, but the seal member 48 is not limited to the O-ring.

While the configuration of the motor-operated valve 2 according to the first embodiment of the present invention has been described above, the operation of the motor-operated valve 2 will be described below.
In the motor-operated valve 2 described above, when a drive pulse signal is given to the stepping motor, the rotor 4 rotates according to the number of pulses, and the valve shaft 41 rotates accordingly, and the male screw 41a of the valve shaft 41 is fixed. The valve shaft 41 moves in the axial direction while rotating by the screw coupling A including the female screw 6d of the arranged valve shaft holder 6.

  The upward movement of the valve shaft 41 (movement in the valve opening direction) is transmitted to the valve guide 18 by the contact of the spring receiver 35, the flange portion 41b, the washer 70, and the ceiling portion 21, and the valve guide 18 and the valve body 17 are moved upward. .

  The downward movement (movement in the valve closing direction) of the valve shaft 41 is transmitted to the valve guide 18 by the contact of the spring receiver 35, the flange portion 41b, the washer 70, the ceiling portion 21, and the valve spring 27, and the valve guide 18 and the valve body 17 are moved. Move down.

  Note that, regardless of whether the valve is open or closed, the valve spring 27 in the valve guide 18 is rotated together with the valve shaft 41 by engagement with the spring receiver 35, and the spring receiver 35 is against the back surface of the valve body 17. The spring receiver 35 is made of a highly slippery resin and has a hemispherical contact portion 35a that is in contact with the flange portion 41b in a substantially point contact state, so that the spring receiver 35 and the flange portion 41b are rotated. A large frictional resistance is not generated between the valve spring 27 and the valve spring 27 is not twisted.

  In the motor-operated valve 2 of the present embodiment that performs the valve closing operation in this way, the flange portion 72c of the valve body guide member 72 is disposed on the opening side end surface of the valve body 30 so that the valve body 30 and the case 60 are entirely connected. Since it is integrated over the circumference by welding or the like, the valve body guide member 72 does not move carelessly as in the case where the valve body guide member 72 is simply fixed by press fitting. There will be no misalignment.

  Further, in the motor-operated valve 2 of the present embodiment, since the seal member 48 is interposed between the outer peripheral surface of the valve body 17 and the inner peripheral surface of the valve body guide member 72, the valve as shown in FIG. In the closed state, the space between the first chamber 26 and the back pressure chamber 28 can be surely sealed, and therefore, leakage of pressure between the first chamber 26 and the back pressure chamber 28 can be prevented.

  Thus, according to the present embodiment, the differential pressure between the push-down force (force acting in the valve closing direction) acting on the valve body 20 in the valve-closed state and the push-up force (force acting in the valve opening direction) is cancelled. Thus, the load on the valve body 20 can be reduced.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment.
For example, in the first embodiment, as shown in an enlarged view in FIG. 2, in the butting portion B, the case 60, the valve body 30, and the valve body guide member 72 are integrated by welding. Although described, the present invention is not limited to this. The fixing means in the present invention is not limited to welding, but may be brazing, adhesion, or the like.

  Moreover, in the said 1st Example, although the flange part 72c of the valve body guide member 72 is mounted on the opening end surface of the valve main body 30, this invention is not limited to this, For example, FIG. As shown in the second embodiment, the shape of the end portion on the upper opening side of the valve element guide member 72 is the shape obtained by cutting the flange portion 72c from the large diameter portion 72a, and the upper end surface 72d of the large diameter portion 72a is It arrange | positions in the middle of the cylindrical part of the valve main body 30, and the upper end surface 72d of the large diameter part 72a is carried out to the inner peripheral surface of the valve main body 30 at this position over the perimeter by fixing means, such as welding or brazing. It can also be integrated in a sealed state.

  In this case, the work for integrating the lower end portion on the opening side of the case 60 and the upper end portion on the upper opening side of the valve body 30 by welding, brazing, bonding, or the like is performed in a separate process. become.

Furthermore, the valve body guide member 72 can be integrated with the valve body 30 by the aspect of the third embodiment shown in FIG.
That is, in the case of the third embodiment shown in FIG. 4, the work is integrated by welding or brazing, bonding or the like between the lower end portion on the opening side of the case 60 and the upper end portion on the upper opening side of the valve body 30. Separately, the end surface of the large-diameter portion 72a of the valve body guide member 72 is butted against the flange portion 6f of the valve shaft holder 6, and in this state, the end surface of the large-diameter portion 72a and the lower surface of the flange portion 6f are welded or The valve body guide member 72 is integrated with the valve main body 30 by fixing by fixing means such as brazing or adhesion. In this case, it goes without saying that the flange portion 6f of the valve shaft holder 6 is integrated in a sealed state over the entire circumference by fixing means such as welding, brazing or adhesion to the valve body 30. .

5 and 6 show another valve body guide member 720 instead of the valve body guide member 72 shown in FIG. 1, and FIG. 6 is a cross-sectional view taken along the line CC ′ in FIG.
In the valve body guide member 720, the large-diameter portion 720a is not a simple cylindrical shape, and linear portions 720e and arc portions 720f are alternately formed. The straight line portions 720e may be provided at any interval.

  If such a valve body guide member 720 is used instead of the valve body guide member 72 of FIG. 1, as shown in FIG. 7, the inner peripheral surface 30a on the upper opening side of the valve body 30, and the valve body guide member A plurality of gaps S are formed in the axial direction (vertical direction in FIG. 7) between the outer peripheral surface 720d of 720. In the present embodiment, these gaps S are arranged at equal intervals on the circumference. Further, since the other portion where the gap S is not formed is constituted by the arc portion 720f, the outer peripheral surface 720d of the large diameter portion 720a of the valve element guide member 720 is formed at the position where the arc portion 720f is formed. And the valve body guide member 720 are tightly locked by being press-fitted into the valve body 30.

  As described above, the large-diameter portion 720a of the valve body guide member 720 is not simply a cylindrical shape, but the linear portions 720e and the arc portions 720f are alternately formed, and the gap S between the valve body guide member 720 and the valve body 30 is formed. If the structure is formed in the axial direction, the contact area of the press-fitting portion of the valve element guide member 720 can be reduced as compared with the case where no gap is formed therein. The press-fitting load between the valve main body 30 can be reduced. Further, there is no need for strict dimensional management for maintaining an appropriate press-fitting load as in the case of press-fitting a cylindrical shape into a cylindrical shape. Therefore, since the dimensional variation can be absorbed, the management range of the dimensions such as the inner diameter of the valve body guide member 720 and the valve main body 30 can be expanded.

  FIG. 7 shows an example in which the tapered portion 30b is provided on the inner peripheral surface of the upper opening side of the valve body 30. However, if such a tapered portion 30b is provided, the valve element guide member 720 is moved to the valve body. It can be easily incorporated into the main body 30.

  Further, as shown in FIG. 7, if a gap S is formed in the axial direction between the inner peripheral surface 30a of the valve main body 30 and the outer peripheral surface 720d on the large diameter portion side of the valve body guide member 720, A sealed space serving as a liquid pool is not formed between the outer peripheral surface 720 d of the valve body guide member 720 and the inner peripheral surface 30 a of the valve body 30. Therefore, in this embodiment in which the gap S is formed in the axial direction, for example, when a sealed space is formed between the outer peripheral surface 720d of the valve body guide member 720 and the inner peripheral surface 30a of the valve body 30. As described above, it is possible to prevent the occurrence of the problem that the refrigerant stays in the sealed space, the staying refrigerant expands due to the temperature change, and the valve body guide member 720 is deformed.

  Or like the valve body guide member 750 shown in FIG. 8, a part of large diameter part 750a may be cut and the thin part 750d may be provided here. Even in the shape as shown in FIG. 8, the gap S can be formed in the axial direction between the inner peripheral surface 30 a of the valve body 30 and the outer peripheral surface of the large-diameter portion 750 a of the valve element guide member 750. Even in this case, the same effect as the fourth embodiment shown in FIG. 7 can be obtained.

  That is, as in the case where a sealed space has been formed between the outer peripheral surface of the large-diameter portion of the valve body guide member 750 and the inner peripheral surface 30a of the valve body 30, the refrigerant stays in the sealed space, Generation | occurrence | production of the malfunction that the accumulated refrigerant | coolant expand | swells by a temperature change and the valve body guide member 750 deform | transforms can be prevented.

Further, if the gap S is formed in the axial direction on the outer peripheral surface of the large-diameter portion 750a of the valve body guide member 750, the press-fitting portion of the valve body guide member 750 is compared with the case where no gap is formed there. The contact area can be reduced, whereby the press-fit load between the valve body guide member 750 and the valve body 30 can be reduced.
In FIG. 8, a keyway may be provided instead of the thin portion 750d. Even when the key groove is provided, the desired gap S can be formed in the axial direction.

  FIG. 9 is a view corresponding to FIG. 3 in the fifth embodiment of the present invention. In the fifth embodiment, as in the case of the second embodiment shown in FIG. 3, the large-diameter portion 730a of the valve body guide member 730 is disposed in the middle of the tubular portion of the valve body 30, and the large portion is located at this position. The diameter portion 730a is integrated with the inner peripheral surface of the valve main body 30 so as to be sealed over the entire circumference by adhering or brazing or adhering means such as adhesion.

  In other locations where the gap S is not formed, the valve body guide member 730 is positioned between the outer peripheral surface of the large diameter portion 730a of the valve body guide member 730 and the inner peripheral surface 30a of the valve body 30. It is locked tightly by being press-fitted inside.

  Even in the fifth embodiment, as in the case of the fourth embodiment, a gap S is formed between the inner peripheral surface 30a of the valve body 30 and the outer peripheral surface 730d of the valve body guide member 730. Therefore, it is possible to reliably prevent the occurrence of the problem that the refrigerant stays in the sealed space and the retained refrigerant expands due to a temperature change and the valve body guide member 730 is deformed.

  Moreover, if the clearance gap S is formed in the axial direction between the internal peripheral surface 30a of the valve main body 30, and the outer peripheral surface 730d of the large diameter part 730a of the valve body guide member 730, the clearance gap is not formed there. Compared to the case, the contact area of the press-fitting portion of the valve element guide member 730 can be reduced, and thereby the press-fitting load between the valve element guide member 730 and the valve body 30 can be reduced.

  FIG. 10 is a view corresponding to FIG. 4 in the sixth embodiment of the present invention. In this embodiment, the end surface of the large-diameter portion 740a of the valve element guide member 740 is abutted against the flange portion 6f of the valve shaft holder 6, and in this state, the end surface of the large-diameter portion 740a and the lower surface of the flange portion 6f are welded. Alternatively, they are integrated in a hermetically sealed state by fixing means such as brazing or adhesion. Thereby, the valve body guide member 740 is integrated with the valve body 30 so as to be sealed over the entire circumference.

  In other locations where the gap S is not formed, the valve body guide member 740 is located between the outer peripheral surface of the large diameter portion 740a of the valve body guide member 740 and the inner peripheral surface 30a of the valve body 30. It is locked tightly by being press-fitted inside.

  Even in the sixth embodiment, the outer peripheral surface of the inner peripheral surface 30a of the valve body 30 and the large-diameter portion 740a of the valve body guide member 740 is the same as in the fourth and fifth embodiments. Since the gap S is formed in the axial direction between the 740d and the 740d, the refrigerant stays in the sealed space, and the accumulated refrigerant expands due to a temperature change and the valve body guide member 740 is deformed. It can be surely prevented.

  Further, if the gap S is formed in the axial direction on the inner circumferential surface 30a of the valve body 30 and the outer circumferential surface 740d of the large diameter portion 740a of the valve body guide member 740, compared to a case where no gap is formed there. Thus, the contact area of the press-fitting portion of the valve body guide member 740 can be reduced, thereby reducing the press-fitting load between the valve body guide member 740 and the valve main body 30.

  FIG. 11 is an enlarged cross-sectional view of a main part showing a seventh embodiment of the present invention. In the seventh embodiment, the flange portion 720 c of the valve element guide member 720 is disposed between the abutting end portions of the case 60 and the valve main body 30. Then, the lower end portion on the opening side of the case 60, the upper end portion on the opening side of the valve body 30 and the flange portion 720c of the valve body guide member 720 are welded or brazed, and fixed to the entire circumference by fixing means such as adhesion. It is integrated in a sealed state.

  In other places where the gap S is not formed, the valve body guide member 720 is between the outer peripheral surface of the large diameter portion 720a of the valve body guide member 720 and the inner peripheral surface 30a of the valve body 30. It is locked tightly by being press-fitted inside.

The seventh embodiment differs from the fourth embodiment shown in FIG. 7 in that the lower end portion of the case 60 is arranged on the valve body 30 via the flange portion 6f of the valve shaft holder 6. is there.
According to the seventh embodiment, the inner peripheral surface 30a of the valve body 30 and the large-diameter portion of the valve body guide member 720, as in the case of the fourth, fifth, and sixth embodiments. Since the gap S is formed in the axial direction between the outer peripheral surface 720d of the 720a, the refrigerant stays in the sealed space, and the staying refrigerant expands due to a temperature change and the valve body guide member 720 is deformed. It is possible to reliably prevent the occurrence of defects.

  Further, if the gap S is formed in the axial direction on the outer peripheral surface 720d of the large-diameter portion 720a of the valve body guide member 720, the press-fit portion of the valve body guide member 720 is compared to the case where no gap is formed there. , And the press-fit load between the valve body guide member 720 and the valve body 30 can be reduced.

  FIG. 12 is an enlarged cross-sectional view showing a main part of an eighth embodiment of the present invention. In the eighth embodiment, the flange portion 6f of the valve shaft holder 6 is arranged slightly radially inward with respect to the upper end portion on the upper opening side of the valve main body 30, and the lower end portion of the case 60 is placed on the upper portion of the valve main body 30. It is arranged at the upper end on the opening side. The upper end portion of the valve main body 30 and the flange portion 720c of the valve element guide member 720 are integrated in a sealed state over the entire circumference by fixing means such as welding or brazing. Further, the lower end portion on the opening side of the case 60 and the upper end portion on the opening side of the valve body 30 are integrated in a sealed state over the entire circumference by fixing means such as welding or brazing. .

  Even in the eighth embodiment, similarly to the fourth to seventh embodiments, the inner peripheral surface 30a of the valve body 30 and the outer peripheral surface of the large-diameter portion 720a of the valve body guide member 720 are used. Since a large gap S is formed in the axial direction with respect to 720d, the refrigerant stays in the sealed space, and the accumulated refrigerant expands due to the temperature change and the valve body guide member 720 is deformed. It can be surely prevented.

  Further, if a gap S is formed in the axial direction on the inner circumferential surface 30a of the valve body 30 and the outer circumferential surface 720d of the large-diameter portion 720a of the valve body guide member 720, compared to a case where no gap is formed there. Thus, the contact area of the press-fitting portion of the valve body guide member 720 can be reduced, thereby reducing the press-fitting load between the valve body guide member 720 and the valve main body 30.

  As described above, in the present invention, if the gap S is formed in the axial direction between the inner peripheral surface of the valve body and the outer peripheral surface of the large diameter portion of the valve body guide member, the valve body guide is used. The member may have any other shape. However, a shape in which a plurality of gaps S are provided in the circumferential direction is preferable.

Further, the present invention is not limited to the motor operated valve provided with the back pressure chamber 28 as in the motor operated valve of the first embodiment shown in FIG. It is.
In addition, the valve body guide member 750 shown in FIG. 8 in which a part of the large diameter portion 750a is cut to form the thin portion 750d can be applied to the fifth and subsequent embodiments. Even when the cross section of the valve body guide member 750 shown in the fifth and subsequent embodiments is shaped as shown in FIG. 8, the outer periphery of the inner peripheral surface 30a of the valve body 30 and the large diameter portion 750a of the valve body guide member 750 A gap S can be formed between the surface and the surface in the axial direction, and the same effect as in the fourth embodiment shown in FIG. 7 can be obtained.

  5 and FIG. 6 may be formed by changing the thickness of the valve element guide member 720, or by changing the thickness of the valve element guide member 720. May be.

FIG. 13 shows an electric valve 200 according to a tenth embodiment of the present invention.
In the case of the motor-operated valve 200 of the tenth embodiment, no vertical hole is formed in the valve body 170 and no back pressure chamber is provided.

Thus, the present invention can be applied to a motor-operated valve in which no back pressure chamber is formed.
As mentioned above, although each Example of this invention was described, in this invention, materials, such as the case 60 shown in FIG. 1, the valve main body 30, the flange part 6f of the valve shaft holder 6, and the valve body guide member 72, are as follows. It is not limited to metal. If these are formed of synthetic resin, the valve body guide member 72 and the like can be fixed by resin welding or an adhesive.

Moreover, when both a metal and a synthetic resin are contained as these materials, it is preferable to integrate with an adhesive agent.
The technical idea of the present invention can be applied not only to a motor-operated valve but also to other flow control valves and further to electromagnetic valves.

2 Motorized valve 4 Rotor 6 Valve shaft holder 6a Tubular small diameter portion 6b Tubular large diameter portion 6c Fitting portion 6d Female thread 6f Flange portion 6g Upper opening 6h Through hole 11 Valve chamber 12 First pipe joint 14 Valve body guide Member 16 Valve port 15 Second pipe joint 17 Valve body 17a Taper portion 17b Vertical hole portion 17c Conduction hole 18 Valve guide 18a Through hole 21 Ceiling portion 26 First chamber 27 Valve spring 28 Back pressure chamber 30 Valve body 30b Taper part 33 Bush member 35a Hemispherical contact part 41 Valve shaft 41a Male thread 41b collar part 48 Seal member 51 Pressure equalizing hole 52 Guide support 53 Cylindrical part 54 Umbrella part 56 Valve opening stopper projection part 57 Positioning hole 58 Cut and raise Piece 59 Spiral guide 60 Case 62 Stopper part 63 Movable stopper member 65 Cylindrical member 67 Rotor accommodating chamber (second back pressure chamber)
70 Washer 72 Valve body guide member 72a Large diameter portion 72b Small diameter portion 72c Flange portion 72d Upper end surface 83 Valve shaft holder chamber 170 Valve body guide member 720a Large diameter portion 720c Flange portion 720d Outer surface 730 Valve body guide member 730a Large Diameter portion 730d Outer peripheral surface 740 Valve body guide member 740a Large diameter portion 740d Outer surface 750 Valve body guide member 750a Large diameter portion 750d Thin wall portion A Screw coupling S Gap

Claims (3)

A motor-operated valve that converts rotational movement of a rotor into linear movement by screw connection between a male screw member and a female screw member, and moves a valve body accommodated in the valve body in the axial direction based on the linear movement. ,
Of the male screw member and the female screw member, one screw member that is disposed so as not to move relative to the valve body, and a valve body guide member that guides the movement of the valve body in the axial direction, Consists of separate members ,
The outer peripheral surface on the upper opening side of the valve body guide member is closely locked to the inner peripheral surface of the valve body, and the outer peripheral surface on the upper opening side of the valve body guide member and the upper opening side of the valve body A gap is formed in the axial direction between the inner peripheral surface of
The motor-operated valve characterized in that the valve body guide member is integrated with an end face on the upper opening side of the valve body, or the valve body guide member is integrated with an inner peripheral surface of the valve body by a fixing means. The motor-operated valve according to claim 1, wherein a seal member is interposed between the valve element guide member and the valve element. It said anchoring means is an electric valve according to claim 1 or 2, wherein the welding or brazing, is either adhesive.

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