JP2017161051A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-operated valve including a valve element capable of surely preventing leakage of a fluid in a valve closing state.SOLUTION: A motor-operated valve 2 in which a rotary motion of a rotor 4 is converted into a linear motion by screw-coupling of a male screw member 41a and a female screw member 6d, and a valve element 17 accommodated in a valve body 30 is axially moved on the basis of the linear motion, includes a valve element guide member 72 for guiding the axial movement of the valve element, and a seal member 48 disposed between the valve element guide member and the valve element. The seal member provides a structure for preventing direct contact of the valve element and the valve element guide member at least in a valve closing state.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, an electric valve used for a large package air conditioner or a refrigerator is known (for example, Patent Document 1). In this electric valve, as shown in FIG. 10, when the stepping motor is driven and the rotor 303 is rotated, the valve body 314 is cylindrically guided through the moving shaft 302 by the screw feeding operation of the female screw 331a and the male screw 321a. It moves in the direction of the axis L along 313. Thereby, the valve body 314 is controlled to open and close, and the flow rate of the refrigerant flowing in from the pipe joint 311 and flowing out from the pipe joint 312 is controlled.

JP 2014-43949 A

  However, in the above-described motor-operated valve, as shown in FIG. 11, the valve body 314 has a structure in which the outer wall surface thereof is guided by the inner wall surface of the cylindrical guide 313 to be opened and closed. When the motor-operated valve is completed in a state where the axis of the body 314 is shifted from the axis of the axis L, the valve seat 314 is in a piece-by-piece state with the lower end of the valve body 314 tilted when the valve body 314 is closed. There is a possibility that a gap may occur between the lower end portion of the valve body 314 and the valve seat member 315 due to contact with the member 315. In this case, when the valve body 314 is closed, it may be assumed that fluid such as a refrigerant is likely to leak.

  The objective of this invention is providing the motor operated valve provided with the valve body which can prevent the leakage of the fluid in a valve closing state reliably.

To achieve the above object, the motor-operated valve of the present invention 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 based on this linear movement in the axial direction. ,
A valve body guide member for guiding the movement of the valve body in the axial direction;
A seal member interposed between the valve element guide member and the valve element;
The seal member has a structure that prevents the valve element and the valve element guide member from directly contacting each other at least in a valve-closed state.

  As a result, even if the motor-operated valve is completed in a state where the shaft core of the valve body is deviated from the shaft center of the motor-operated valve, the valve body remains within the clearance generated between the valve body and the valve body guide member. Since it can swing or move in the radial direction, the shaft core of the valve body can be aligned with the axis of the motor-operated valve. Furthermore, by aligning the valve body so that there is no gap between the lower end of the valve body and the valve seat member in the closed state, it is ensured that a medium such as refrigerant leaks in the closed state. Can be prevented.

Moreover, the motor operated valve of the present invention is
The lower end portion of the valve element guide member is formed with a tapered portion in which at least an inner wall surface is inclined outward.

  Thereby, in the process in which a valve body transfers to a valve opening state from a valve closing state, the valve body raise becomes difficult to be inhibited by a valve body guide member, and a valve body becomes easy to be accommodated in a valve body guide member. Further, when assembling the electric valve, the seal member can be easily inserted into the small-diameter portion of the valve element guide member without using a tool such as a jig, so that the workability when assembling the electric valve is improved. Man-hours related to work can be reduced.

Moreover, the motor operated valve of the present invention is
The valve body is characterized in that an inclined portion having an outer wall surface inclined outward is formed downward.

  In this way, by forming the inclined portion in the valve body, in the process in which the valve body transitions from the closed state to the open state, the valve body is prevented from rising by the valve body guide member, and the valve body is It becomes easy to be accommodated in the body guide member.

Moreover, the motor operated valve of the present invention is
The seal member is mounted on either the valve body or the valve body guide member before assembling the electric valve.

  According to the invention of the present invention, fluid leakage in the valve-closed state can be reliably prevented.

It is sectional drawing of the motor operated valve which concerns on 1st Embodiment. It is a principal part expanded sectional view of the motor operated valve shown in FIG. In the motor operated valve concerning a 1st embodiment, it is an important section expanded sectional view at the time of using an O ring for a seal member. In the motor operated valve concerning a 1st embodiment, it is an important section expanded sectional view at the time of using a composite sealing material for a sealing member. It is a principal part expanded sectional view of the motor operated valve which concerns on 2nd Embodiment. It is a schematic diagram explaining the process of assembling the electric valve which concerns on 2nd Embodiment. It is sectional drawing of the motor operated valve which concerns on 3rd Embodiment. It is a principal part expanded sectional view of the motor operated valve which concerns on 3rd Embodiment. It is a schematic diagram explaining the process of assembling the electric valve which concerns on 3rd Embodiment. It is sectional drawing of the conventional motor operated valve currently disclosed by Unexamined-Japanese-Patent No. 2014-43949. It is a principal part expanded sectional view of the conventional motor operated valve currently disclosed by Unexamined-Japanese-Patent No. 2014-43949.

  Hereinafter, the motor-operated valve according to the first embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a motor-operated valve 2 according to the first embodiment. In the present specification, “upper” or “lower” is defined in the state of FIG. That is, the rotor 4 is located above the valve member 17.

In the motor-operated valve 2, the valve main body 30 is integrally connected by welding or the like below the opening side of a case 60 made of a non-magnetic material and having a cylindrical cup shape.
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 fixedly mounted with a first pipe joint 12 made of stainless steel or copper that directly communicates with the valve chamber 11. Further, a valve seat member 30 </ b> A in which the valve port 16 is formed is incorporated in the lower inside of the valve body 30. A stainless steel or copper second pipe joint 15 communicating with the valve chamber 11 via the valve port 16 is fixedly attached to the valve seat member 30A.

  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.

  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 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 as will be described later. It is fixed to be relatively non-rotatable.

  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. Become. The flange portion 6 f of the valve shaft holder 6 is fixed between the upper surface of the flange portion 72 c of the valve element guide member 72 and the case 60 by welding or the like. Further, a through hole 6 h is formed inside the valve shaft holder 6.

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.

  Further, a cylindrical valve guide 18 is disposed below 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. A flange 41 b is further formed below the valve shaft 41.

  Here, the valve shaft 41 is inserted into 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. It arrange | positions in the valve guide 18 so that it can rotate with respect to the guide 18 and it can displace to radial direction. In addition, the valve shaft 41 is inserted through the through hole 18 a, and the upper surface 41 c of the flange portion 41 b is disposed so as to face the ceiling portion 21 of the valve guide 18. The flange 41b is larger in diameter than the through hole 18a of the valve guide 18 so that 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 member 17 is obtained.

  Moreover, the lower end part of the valve shaft 41 is formed with a protruding part 41c that protrudes below the flange part 41b and makes point contact with a spring receiver 35 described later (see FIG. 2). The protruding portion 41c functions as a fulcrum when the valve member 17 swings in the process of shifting from the closed state to the open state. In addition, since the protrusion 41c is not restrained by the spring receiver 35 and is only in point contact with the spring receiver 35, the valve member 17 can also move in the radial direction with respect to the valve shaft 41.

  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.

  Further, a compressed valve spring 27 and a spring receiver 35 are accommodated in the valve guide 18. The upper end of the spring receiver 35 is in point contact with the protrusion 41c of the valve shaft 41 as described above.

  Next, the principal part of the motor-operated valve 2 in the present invention will be described. FIG. 2 is an enlarged cross-sectional view of a main part of the motor-operated valve 2 according to the first embodiment. As shown in FIG. 2, a valve member 17 and a valve body guide member 72 that guides the movement of the valve member 17 in the axial direction are arranged inside the valve body 30, and the valve member 17, the valve body guide member 72, A seal member 48 is interposed between the two.

  The valve member 17 includes a valve body holding portion 17A and a valve body portion 17B. The valve body holding portion 17A includes a connecting portion 17A1 in which a vertical hole portion 17b is formed as a pressure equalizing path, and a head portion 17A2 in which a lateral conduction hole 17c is formed as a pressure equalizing path. Yes. Here, the pressure in the valve port 16 (in the second pipe joint 15) is guided to the back pressure chamber 28 through the hole 17b and the conduction hole 17c which are pressure equalization paths. The valve body 17B is formed with a receiving space 17a for receiving the connecting portion 17A1 in the vertical direction.

  Further, in the longitudinal direction of the valve member 17, an annular packing 48a having an L-shaped cross section is provided between the lower end surface 17g of the head portion 17A2 of the valve body holding portion 17A and the upper end surface 17h of the valve body portion 17B. An annular seal member 48 formed with the reinforcing plate 48b interposed therebetween is disposed. As described above, since the seal member 48 is interposed between the valve member 17 and the valve element guide member 72 in the lateral direction, at least when the motor-operated valve 2 is closed, the seal member 48 is shown in FIG. As shown, the direct contact between the valve member 17 and the valve element guide member 72 is prevented. For this reason, even if the motor-operated valve 2 is completed with the shaft core of the valve member 17 deviating from the axis of the motor-operated valve 2, the clearance generated between the valve member 17 and the valve element guide member 72 is reduced. Among them, the valve member 17 can be swung with the protruding portion 41c of the valve shaft 41 as a fulcrum, or can be horizontally moved in the radial direction, so that the axis of the valve member 17 can be easily aligned with the axis of the motor-operated valve 2. be able to. Accordingly, the valve member 17 can be aligned so that no gap is generated between the lower end portion of the valve member 17 and the valve seat member 30A in the valve-closed state.

  The valve body guide member 72 is a cylindrical body through which the inside penetrates, and has a flange portion 72c located at the uppermost position, a large diameter portion 72a below the flange portion 72c, and a small diameter portion 72b below the press portion. Is formed by. 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 manner, the seal member 48 can be closely locked to the inner peripheral surface of the valve body guide member 72 when the valve body guide member 72 is combined with the valve body 30.

  While the configuration of the motor-operated valve 2 according to 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, 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 41 a of the valve shaft 41 is fixedly arranged. The valve shaft 41 moves in the axial direction while rotating by the screw coupling A formed by the female screw 6d of the valve shaft holder 6.

  The downward movement (movement in the valve closing direction) of the valve shaft 41 is transmitted to the valve guide 18 by contact of the spring receiver 35, the flange 41 b, the washer 70, the ceiling 21, and the valve spring 27, and the valve guide 18 and the valve member 17. Is done by moving down.

  The upward movement of the valve shaft 41 (movement in the valve opening direction) is also 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 member 17 are moved upward. Is done. Note that the valve member 17 at the time of transition from the valve closed state to the valve open state is in a state in which the valve member 17 is relatively easy to swing because it is affected by the pressure of the fluid flowing in from the first pipe joint 12 or the like. Since the valve member 17 is guided by the valve body guiding portion 72 after the valve has been moved upward and accommodated in the valve body guiding portion 72, the valve member 17 is hardly affected by pressure due to fluid or the like, and the valve member 17 is difficult to swing. Become. Thus, the operability of the valve member 17 is improved by guiding the valve member 17 by the valve body guide portion 72.

  According to the motor-operated valve 2 according to the first embodiment, the seal member 48 is interposed between the valve member 17 and the valve element guide member 72, and the valve member 17 and the valve element guide member 72 are in direct contact with each other. By preventing this, it is possible to reliably prevent a fluid such as a refrigerant from leaking when the valve is closed.

  In the above-described first embodiment, the case where the valve shaft 41 and the valve member 17 are connected via the valve guide 18 is described as an example. However, the motor-operated valve 2 includes the valve guide 18. Instead, the valve member 17 may be formed integrally with the valve shaft 41. Also in this case, the valve member 17 can swing or move horizontally in the radial direction due to the clearance formed between the male screw 41a and the female screw 6d.

  Further, in the sealing member 48 according to the first embodiment described above, the L-shapes are acute angles on the upper side of the annular packing 48a disposed on the upper side and on the lower side of the annular packing 48a disposed on the lower side, respectively. It is preferable that a leaf spring for biasing the annular packing is disposed on the outside so as not to be too much. Further, as shown in FIG. 3, the seal member 48 may be composed of only an annular packing (so-called O-ring) having a substantially circular cross section, or as shown in FIG. Alternatively, a composite sealing material in which an O-ring 48d and an annular packing 48f having a C-shaped cross section made of a highly lubricating resin material such as PTFE may be used.

  Next, an electric valve according to a second embodiment will be described with reference to the drawings. In the motor-operated valve according to the second embodiment, a tapered portion is formed at the lower end portion of the small-diameter portion 72b of the valve element guide member 72 according to the first embodiment. Therefore, description of the same configuration as that of the first embodiment is omitted, and only different portions will be described.

  FIG. 5 is an enlarged cross-sectional view of a main part of the motor-operated valve according to the second embodiment. As shown in FIG. 5, a tapered portion 72 f is formed at the lower end portion of the small diameter portion 72 b of the valve element guide member 72 so as to incline outwardly downward. FIG. 5 shows a case where the tapered portion 72f is formed without changing the thickness of the small diameter portion 72b, but only the thickness of the inner wall surface of the small diameter portion 72b is gradually reduced downward. Only the inner wall surface may be inclined outwardly downward. As shown in FIG. 5, the valve body portion 17 </ b> B is a cylindrical member in which the upper portion 171 has a smaller diameter than the lower portion 172, and between the upper portion 171 and the lower portion 172, An inclined portion 173 that is inclined outward is formed.

  According to the invention relating to the second embodiment, the operability of the valve member 17 can be ensured by forming the tapered portion 72 f at the lower end portion of the small diameter portion 72 b of the valve element guide member 72. Specifically, it is possible to prevent the valve member 17 from being hindered by the valve body guide member 72 in the process in which the valve member 17 transitions from the closed state to the open state. It becomes easy to be accommodated in the body guide member 72.

  Further, by forming the inclined portion 173 in the valve body portion 17B, the valve body guide member 72 may be hindered by the valve body guide member 72 from moving upward from the closed valve state to the open valve state. The valve member 17 can be easily accommodated in the small diameter portion 72b.

  Further, by forming the tapered portion 72f at the lower end portion of the small diameter portion 72b of the valve body guide member 72, the motor-operated valve can be easily assembled. This effect will be described below with reference to FIG.

  FIG. 6A is a view showing the relationship between the valve body guide member 72, the valve member 17, and the seal member 48 before assembling the electric valve. As shown in FIG. 6A, in the motor-operated valve according to the second embodiment before being assembled, the outer diameter Dp of the seal member 48 is larger than the inner diameter Di of the small-diameter portion 72b of the valve body guide member 72. Furthermore, the inner diameter Dt of the lower end of the tapered portion 72f of the valve element guide member 72 is formed to be larger than the outer shape Dp of the seal member 48.

  That is, the diameter increases in the order of the inner diameter Di of the small diameter portion 72b of the valve body guide member 72 <the outer shape Dp of the seal member 48 <the inner diameter Dt of the lower end of the tapered portion 72f of the valve body guide member 72.

  By the way, when the taper part 72f is not formed in the lower end part of the valve body guide member 72 like the motor-operated valve 2 which concerns on 1st Embodiment (refer FIG. 2), in order to assemble the motor-operated valve 2, a seal | sticker It is necessary to insert the member 48 into the valve body guide member 72 while shrinking the seal member 48 using a jig or the like so that the outer shape Dp of the member 48 is smaller than the inner diameter Di of the small diameter portion 72b of the valve body guide member 72. However, as shown in FIG. 6A, when the tapered portion 72f is formed at the lower end portion of the valve element guide member 72, when the sealing member 48 is pressed against the tapered portion 72f from the lower side when the motor-operated valve 2 is assembled. The outer shape of the seal member 48 is guided by the taper portion 72f, and the outer shape Dp is reduced as it rises, and is inserted into the small diameter portion 72b of the valve element guide member 72 as shown in FIG.

  In this manner, by forming the tapered portion 72f at the lower end portion of the valve body guide member 72, it is possible to prevent the valve member 17 from being hindered by the valve body guide member 72. It becomes easy to be accommodated in the body guide member 72. Further, since the seal member 48 can be easily inserted into the small diameter portion 72b of the valve body guide member 72 without using a tool such as a jig, the workability when assembling the motor-operated valve is improved, and the work is related to the work. Man-hours can be reduced. In addition, since an instrument such as a jig is not used, there is no fear of damaging the seal member 48 with the instrument when assembling the electric valve.

  Next, an electric valve according to a third embodiment will be described with reference to the drawings. In the motor-operated valve according to the third embodiment, the seal member 48 disposed on the valve member 17 side in the first embodiment is disposed on the valve element guide member 72 side. Further, an inclined portion is formed on the outer peripheral surface of the valve member 17. Therefore, description of the same configuration as that of the first embodiment is omitted, and only different portions will be described.

  FIG. 7 is a cross-sectional view showing a motor-operated valve according to the third embodiment, and FIG. 8 is an enlarged cross-sectional view of a main part thereof. As shown in FIG. 8, the lower end portion of the small diameter portion 72b of the valve body guide member 72 is formed with a bent portion 72k bent inside the valve body guide member 72, and the seal member 48 is formed on the bent portion 72k. Is arranged. In addition, an inclined portion 173 is formed on the outer peripheral surface of the valve member 17 so as to be inclined outwardly downward. 7 and 8 show an example in which a composite sealing material in which an O-ring 48d and an annular packing 48f having a C-shaped cross section are combined is used as the sealing member 48, the sealing member 48 is a composite sealing material. There is no limitation to the material. For example, a sealing material composed only of an O-ring may be employed, or a material in which an annular reinforcing plate 48b is sandwiched between annular packings 48a having an L-shaped cross section (see FIG. 2) may be employed.

  According to the invention according to the third embodiment, the seal member 48 is not disposed on the valve member 17 side, but is easily disposed on the bent portion 72k that is bent on the inner side of the valve body guide member 72. A seal member 48 can be mounted in the motorized valve.

Further, by forming the inclined portion 173 on the outer peripheral surface of the valve member 17, the motor-operated valve can be easily assembled. This effect will be described below with reference to FIG.
FIG. 9A is a view showing the relationship between the valve body guide member 72, the valve member 17, and the seal member 48 before assembling the electric valve. As shown in FIG. 9A, in the motor-operated valve according to the third embodiment before being assembled, the inner diameter Dp of the sealing member 48 is larger than the upper diameter Dt of the valve member 17, and the sealing member The lower diameter Dr of the valve member 17 is larger than the inner diameter Dp of 48.

That is, the diameter increases in the order of the diameter Dt of the upper part of the valve member 17 <the inner diameter Dp of the seal member 48 <the diameter Dr of the lower part of the valve member 17.
For this reason, when assembling the solenoid valve, first, the valve shaft 41 is inserted into the valve shaft holder 6 and penetrated through the cylindrical small diameter portion 6a, and then the valve shaft 41 is rotated so that the male screw of the valve shaft 41 41 a and a female screw 6 d formed on the inner periphery of the cylindrical small diameter portion 6 a of the valve shaft holder 6 are screwed together so that the upper portion of the valve member 17 is positioned in the seal member 48. When the position of the valve member 17 is moved upward in this state, the inclined portion 173 of the valve member 17 comes into contact with the seal member 48. When the position of the valve member 17 is further moved upward, the seal member 48 is gradually expanded by being guided by the inclination of the inclined portion 173, and the valve member 17 is moved to the valve element guide member 72 as shown in FIG. 9B. Is inserted into the small-diameter portion 72b.

  Thus, by forming the inclined portion 173 on the outer peripheral surface of the valve member 17, the valve member 17 can be easily inserted into the valve element guide member 72 without using a tool such as a jig. The workability at the time of assembling the valve is improved, and the number of man-hours related to the work can be reduced. In addition, since an instrument such as a jig is not used, there is no fear of damaging the seal member 48 with the instrument when assembling the electric valve.

  Also in the invention according to the third embodiment, as described in the first embodiment, the seal member 48 is interposed between the valve member 17 and the valve body guide member 72. In at least the valve-closed state, the valve member 17 and the valve element guide member 72 are prevented from directly contacting each other. Therefore, the valve member 17 can swing or horizontally move in the radial direction, and the valve member 17 is aligned so that no gap is generated between the lower end portion of the valve member 17 and the valve seat member 30A. Easy to do. Therefore, it is possible to reliably prevent a fluid such as a refrigerant from leaking.

  In the second and third embodiments, the motor-operated valve 2 may not include the valve guide 18 and the valve member 17 may be formed integrally with the valve shaft 41. Even in this case, the valve member 17 can be swung or horizontally moved in the radial direction by the clearance formed between the male screw 41a and the female screw 6d.

  Further, in the above-described embodiment, the case where the hole 17b and the conduction hole 17c are provided in the valve member 17 as the pressure equalizing path is described as an example, but the pressure equalizing path is not necessarily provided in the valve member 17. It does not have to be. For example, instead of providing a pressure equalization path in the valve member 17, a piping member that guides the pressure of the valve port 16 to the back pressure chamber 28 may be provided separately.

2 Motorized valve 4 Rotor 6 Valve shaft holder 6d Female thread 11 Valve chamber 13 Guide 14 Valve body 16 Valve port 17 Valve member 17A Valve body holding portion 17A1 Connection portion 17A2 Head portion 17B Valve body portion 17a Receiving space 17b Hole portion 17c Conduction hole 17g Lower end surface 17h Upper end surface 18 Valve guide 21 Ceiling part 27 Valve spring 28 Back pressure chamber 30 Valve body 30A Valve seat member 41 Valve shaft 41a Male thread 48 Seal member 48a Ring packing 48b Reinforcement plate 48d Ring 48f Ring packing 52 Guide support 72 Valve body guide member 72a Large diameter portion 72b Small diameter portion 72c Flange portion 72f Taper portion 83 Valve shaft holder chamber 171 Upper portion 172 Lower portion 173 Inclined portion

However, in the above-described motor-operated valve, as shown in FIG. 11, the valve body 314 has a structure in which the outer wall surface thereof is guided by the inner wall surface of the cylindrical guide 313 to be opened and closed. When the electric valve is completed in a state where the axis of the body 314 is displaced with the axis of the shaft L, the valve seat in a state of partial contact while the lower end is inclined in the valve body 314 upon the valve body 314 in the closed state There is a possibility that a gap may occur between the lower end portion of the valve body 314 and the valve seat member 315 due to contact with the member 315. In this case, when the valve body 314 is closed, it may be assumed that fluid such as a refrigerant is likely to leak.

As a result, even if the motor-operated valve is completed in a state where the shaft core of the valve body is shifted from the shaft core of the motor-operated valve, the valve body is not removed in the clearance generated between the valve body and the valve body guide member. since it is possible to move the oscillating or radially, it is possible to align the axis of the valve body the axis of the electric valve. Furthermore, by aligning the valve body so that there is no gap between the lower end of the valve body and the valve seat member in the closed state, it is ensured that a medium such as refrigerant leaks in the closed state. Can be prevented.

Moreover, the motor operated valve of the present invention is
A taper portion in which at least an inner wall surface is inclined outward is formed at the lower end portion of the valve element guide member.

Moreover, the motor operated valve of the present invention is
It said valve body, the outer wall surface downward, characterized in that the inclined portion inclined outward is formed.

Here, the valve shaft 41 is inserted into 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. It arrange | positions in the valve guide 18 so that it can rotate with respect to the guide 18 and it can displace to radial direction. Further, the valve shaft 41 inserted through the through hole 18a, the upper surface of the flange portion 41b is disposed so as to face the ceiling portion 21 of the valve guide 18. The flange 41b is larger in diameter than the through hole 18a of the valve guide 18 so that the valve shaft 41 is prevented from coming off.

Further, in the longitudinal direction of the valve member 17, an annular packing 48a having an L-shaped cross section is provided between the lower end surface 17g of the head portion 17A2 of the valve body holding portion 17A and the upper end surface 17h of the valve body portion 17B. An annular seal member 48 formed with the reinforcing plate 48b interposed therebetween is disposed. As described above, since the seal member 48 is interposed between the valve member 17 and the valve element guide member 72 in the lateral direction, at least when the motor-operated valve 2 is closed, the seal member 48 is shown in FIG. As shown, the direct contact between the valve member 17 and the valve element guide member 72 is prevented. Therefore, if the axis of the valve member 17 even if the electric valve 2 is completed with a shift with the axis of the electric valve 2, the clearance created between the valve member 17 and the valve guide member 72 valve member 17 is swinging fulcrum protrusion 41c of the valve shaft 41, or it becomes possible to horizontally move in the radial direction, align the axis of the valve member 17 to readily axis of the electric valve 2 at medium be able to. Accordingly, the valve member 17 can be aligned so that no gap is generated between the lower end portion of the valve member 17 and the valve seat member 30A in the valve-closed state.

Lowering movement of the valve shaft 41 (valve closing direction movement), the spring receiver 35, the flange portion 41b, is transmitted washer 70, the valve guide 18 by the contact of the ceiling 2 1, the mobile drops the valve guide 18 and the valve member 17 Is done.

That is, the diameter increases in the order of the diameter Dt of the upper part of the valve member 17 <the inner diameter Dp of the seal member 48 <the diameter Dr of the lower part of the valve member 17.
Therefore, when assembling the electric valve operating, after passed through the cylindrical small-diameter portion 6a is first injects the valve shaft 41 in the valve shaft holder 6, by rotating the valve shaft 41, male valve stem 41 The screw 41 a and a female screw 6 d formed on the inner periphery of the cylindrical small diameter portion 6 a of the valve shaft holder 6 are screwed together so that the upper portion of the valve member 17 is positioned in the seal member 48. When the position of the valve member 17 is moved upward in this state, the inclined portion 173 of the valve member 17 comes into contact with the seal member 48. When the position of the valve member 17 is further moved upward, the seal member 48 is gradually expanded by being guided by the inclination of the inclined portion 173, and the valve member 17 is moved to the valve element guide member 72 as shown in FIG. 9B. Is inserted into the small-diameter portion 72b.

Claims (4)

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 based on this linear movement in the axial direction. ,
A valve body guide member for guiding the movement of the valve body in the axial direction;
A seal member interposed between the valve element guide member and the valve element;
The motor-operated valve characterized by having the structure which prevents the said valve body and the said valve body guide member from contacting directly at least by the said sealing member at a valve closing state.   2. The motor-operated valve according to claim 1, wherein a taper portion in which at least an inner wall surface is inclined outward is formed at a lower end portion of the valve body guide member.   The motor-operated valve according to claim 1, wherein the valve body is formed with an inclined portion whose outer wall surface is inclined outwardly downward.   The electric motor according to any one of claims 1 to 3, wherein the seal member is attached to either the valve element or the valve element guide member before the electric valve is assembled. valve.

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