JP2019082206A - Motor valve - Google Patents

Abstract

To provide a motor valve capable of precisely arranging and fixing a stopper presser to a valve body or flange plate.SOLUTION: A stopper presser 48 is configured such that an exterior support part 48a mounted at a lower stopper 25 is arranged so as to separate from a valve body 40, and an attachment fixation part 48b provided on an outer periphery of the exterior support part 48a is attached and fixed to a flange plate 47 fastened to the valve body 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor-operated valve used as a flow control valve or the like in a refrigeration cycle of an air conditioner, a refrigerator or the like.

  As a motorized valve of this type, for example, a valve stem having a valve body at its lower end, and a guide bush having a cylindrical portion into which the valve stem is inserted so as to be relatively movable and relatively rotatable in the axial direction; A valve body having a valve seat portion (valve seat) to which the valve body contacts and separates, and a valve body to which the guide bush is attached and fixed, a cylindrical portion into which the guide bush is inserted, and an upper end portion of the valve shaft A valve shaft holder having a ceiling through which a hole is formed and connected and fixed to the valve shaft, and between the valve shaft and the valve shaft holder to bias the valve body in the valve closing direction. A motor having a interposed biasing member, a rotor and a stator for rotating the valve shaft holder with respect to the guide bush, a fixed screw portion formed on the outer periphery of the guide bush, and the valve shaft holder Movable thread formed on the inner circumference A screw feed mechanism for moving up and down the valve body of the valve shaft relative to the valve seat portion (valve seat) according to the rotational drive of the rotor, and restricting the rotational movement of the valve shaft holder A lower stopper mechanism including a fixed stopper body provided on a lower stopper having a female screw portion screwed to the fixed screw portion of the guide bush, and a movable stopper body provided on the valve shaft holder; It is known that a gap of a predetermined size is formed between the valve body and the valve seat portion (valve seat) when the valve body is in the fully lowered position (for example, Patent Document 1).

  In the air conditioner using the valve-less type motor-operated valve as described above, a gap of a predetermined size between the valve seat and the valve seat even when the valve body is in the lowermost position (which is normally fully closed). Therefore, for example, when dehumidifying operation is performed at midnight, it is possible to operate with the amount of refrigerant squeezed without fully closing the motor-operated valve, and suppress generation of operation noise due to on / off of the motor-operated valve. be able to. In addition, the motor-operated valve as described above has an advantage that it is possible to reliably prevent the sticking of the valve body to the valve seat as compared with a normal valve-closing type motor-operated valve.

JP, 2016-217451, A

  By the way, in the conventional motor-operated valve as described above, in order to form a gap of a predetermined size between the valve body and the valve seat, it engages with a lower stopper having a fixed stopper body constituting a stopper mechanism. The lower stopper may be non-rotatably connected to the guide bush and positioned using a stopper pressing (pressing member) that prevents relative rotation of the lower stopper with respect to the guide bush.

  For example, in the conventional motor-operated valve described in the above-mentioned Patent Document 1, the stopper presser is made of a disk-like member made of a flat plate, and is externally fitted and engaged with the lower stopper. It mounts on the upper surface of the bowl-shaped board fixed by brazing etc. to the said valve main body, and is fixed by joining. Therefore, for example, the unevenness due to the brazing material attached to the upper surface of the valve body or the wedge plate on which the stopper press is placed and fixed, the variation in the flatness (surface accuracy) of the upper surface of the valve body or the wedge plate, etc. The stopper presser may be inclined with respect to the valve body or the hook plate, and a gap may be generated between the stopper press and the valve body or the hook plate, so that the stopper press may not be precisely fixed.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electrically operated valve capable of finely arranging and fixing a stopper press with respect to a valve body or a hooked plate. is there.

  In order to solve the problems described above, the motor-operated valve according to the present invention basically comprises a valve shaft provided with a valve body and a guide in which the valve shaft is inserted so as to be relatively movable and relatively rotatable in the axial direction. A valve body having a bush, a valve seat with a valve seat to which the valve body contacts and separates, and the guide bush attached and fixed, a valve shaft holder connected to the valve shaft, and the valve shaft holder A motor having a rotor and a stator for rotating relative to the guide bush, and the guide bush for raising and lowering the valve body of the valve stem relative to the valve seat of the valve body in accordance with the rotational driving of the rotor; A screw feed mechanism provided between the valve shaft holder, a movable stopper body provided on the valve shaft holder, and a lower portion attached to the guide bush for restricting the rotational movement of the valve shaft holder. A lower stopper mechanism having a fixed stopper body provided on a stopper, and a pressing member for preventing relative movement of the lower stopper with respect to the guide bush, the pressing member being mounted on the lower stopper, and It has a feature that it has an exterior support part arranged apart from a valve main part, and an attachment fixing part which is provided on an outer periphery of the exterior support part and attached and fixed to the valve main body.

  In a preferred aspect, a stepped portion is provided between the exterior support portion and the mounting and fixing portion.

  In another preferred embodiment, the exterior support portion is provided with a fitting hole through which the lower stopper is inserted, and a plurality of support claws for holding the lower stopper are erected adjacent to the fitting hole. .

  In another preferable aspect, the attachment fixing portion of the pressing member is fixed to a hook-like plate provided on the outside of the guide bush in the valve main body.

  In a further preferred embodiment, a can is joined to the outer periphery of the scissor plate.

  In another preferred embodiment, an annular groove is provided on the inner side of a portion of the valve body in contact with the mounting fixing portion.

  According to the present invention, in the pressing member, the exterior support portion attached to the lower stopper is disposed apart from the valve main body, and the fixing portion provided on the outer periphery of the exterior support portion is attached and fixed to the valve main body Since the exterior support does not abut the valve body, for example, the pressing member is made of a disk-like member made of a flat plate, and the pressing member is compared with a conventional motorized valve whose almost entire surface abuts the valve body. There is no risk of tilting with respect to the valve body, and the pressing member can be precisely arranged and fixed with respect to the valve body.

  Also, for example, the contact surface (attachment / fixing portion) with the valve body can be smaller than that of a conventional motorized valve in which almost the entire surface of the pressing member abuts the valve body, and the surface accuracy (flatness) of the fixed portion As a result, the pressing member can be precisely disposed and fixed relative to the valve body.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows one Embodiment of the motor operated valve which concerns on this invention. The valve-shaft holder shown by FIG. 1 is shown, (A) is a perspective view, (B) is a top view. The stopper press shown by FIG. 1 is shown, (A) is a perspective view, (B) is a top view. The state in the middle of the assembly of the motor-operated valve shown in FIG. 1 (the state which mounted | worn the stopper press) is shown, (A) is a perspective view, (B) is a top view.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In each of the drawings, the gaps formed between the members, the separation distance between the members, etc. may be drawn in an exaggerated manner in order to facilitate understanding of the invention and for convenience of drawing. is there. Further, in the present specification, the description indicating the position and direction such as upper and lower and right and left is based on the direction arrow display of FIG. 1 and does not indicate the position and direction in the actual use state.

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

  The motor-operated valve 1 of the illustrated embodiment is used by being incorporated as a flow control valve or the like in a refrigeration cycle such as an air conditioner or a refrigerator, mainly using a valve shaft 10 provided with a valve body 14 and a guide A stepping motor 50 comprising a bush 20, a valve shaft holder 30, a valve body 40, a can 55, a rotor 51 and a stator 52, a compression coil spring (biasing member) 60, and a fixing member 70 as a stopper , A screw feed mechanism 28 and a lower stopper mechanism 29.

  The valve shaft 10 has an upper small diameter portion 11, an intermediate large diameter portion 12, and a lower small diameter portion 13 from the upper side, and a fluid (refrigerant) flowing through the valve port 46 to the lower end of the lower small diameter portion 13. A stepped inverted conical valve body 14 is integrally formed to control the flow rate of passing through the valve.

  The guide bush 20 is inserted in such a cylindrical portion 21 that (the intermediate large diameter portion 12 of the valve shaft 10 is capable of relative movement (sliding) in the direction of the axis O and relative rotation around the axis O; Extending upward from the upper end of the cylindrical portion 21, the inner diameter is larger than that of the cylindrical portion 21, and the upper end side of the middle large diameter portion 12 of the valve shaft 10 and the lower end side of the upper small diameter portion 11 are inserted. And a setting unit 22. One end of a screw feed mechanism 28 configured to raise and lower the valve body 14 of the valve shaft 10 with respect to the valve seat 46 a of the valve main body 40 according to the rotational drive of the rotor 51 The fixing screw portion (male screw portion) 23 is formed. Further, the lower portion of the cylindrical portion 21 (the portion below the fixing screw portion 23) has a large diameter, and serves as a fitting portion 27 to the fitting hole 44 of the valve main body 40. The lower stopper 25 is screwed to the fixed screw portion 23 (in the lower side than the valve shaft holder 30 in the above), and the lower stopper that regulates the rotational downward movement of the valve shaft holder 30 on the outer periphery of the lower stopper 25. A fixed stopper body 24 constituting one of the mechanisms 29 is integrally provided in a projecting manner. In the present embodiment, the upper surface 27a of the fitting portion 27 is a stopper portion that regulates the downward movement of the lower stopper 25 (in other words, defines the position of the lower stopper 25 in the seating state described later).

  Further, in the present embodiment, the lower stopper 25 attached to the guide bush 20 (the fixing screw portion 23 thereof) is externally covered with the stopper pressing (pressing member) 48, and the lower stopper 25 is guided by the stopper pressing 48. It is non-rotatably connected to (the fixing screw 23 of) the bush 20 (detailed later).

  The valve shaft holder 30 is, for example, made of resin (preferably made of resin reinforced with SUS, carbon fiber or the like having high abrasion resistance in consideration of contact with the fixing member 70), and the guide bush 20 is The upper end of the cylindrical portion 31 to be inserted and the upper end portion of (the upper small diameter portion 11 of) the valve shaft 10 is inserted (in a relatively movable state in the direction of the axis O and relatively rotatable around the axis O) And a ceiling 32 provided. A movable screw portion (female screw portion) 33 which forms the screw feed mechanism 28 by being screwed with the fixed screw portion 23 of the guide bush 20 is formed at the lower inner periphery of the cylindrical portion 31 of the valve shaft holder 30. At the same time, the inner peripheral upper portion of the cylindrical portion 31 is in contact (sliding contact) with the outer periphery of the cylindrical extending portion 22 of the guide bush 20. At the lower end of the outer periphery of the cylindrical portion 31, a movable stopper body 34 constituting the other of the lower stopper mechanism 29 is integrally provided in a protruding manner.

  In addition, the upper surface of the ceiling portion 32 of the valve shaft holder 30 (the surface facing the flange portion 72 of the fixing member 70 described later) can be seen in plan view (axis As viewed in the O direction, two convex portions 35 having a substantially fan shape (here, a fan shape having a central angle of about 90 degrees) are integrally formed. Specifically, the two projections 35 are on the opposite side to the axis O (in other words, the valve axis) around the insertion hole 32a in the upper surface of the ceiling 32 (in other words, around the rotation axis O of the valve shaft holder 30). While projecting upward at a position symmetrical with respect to the rotation axis O of the holder 30, and in the meantime (in this example, the upper portion of one end face 34a in the circumferential direction of the movable stopper body 34, ie, the axis O direction) When viewed in a section including the same position as one end face 34a in the circumferential direction of the movable stopper 34) (a substantially fan shape (in this case, the central angle is about 90 degrees fan-shaped) notch 36).

  The contact area (rotational sliding resistance) when the valve shaft holder 30 abuts on the fixing member 70 is reduced, for example, because the contact area of the valve shaft holder 30 with the fixing member 70 is reduced by the convex portion 35.

  Also, for example, when the valve shaft holder 30 is made of a molded product such as resin, the position of the weld line or parting line formed at the time of molding is matched with the position of the notch 36, that is, weld at the time of molding By providing the notches 36 at locations where lines or parting lines are formed, the contact resistance (rotational sliding resistance) can be further reduced, and the flatness of the sliding surface of the valve shaft holder 30 becomes high. The axial misalignment of the valve stem 10 can be further suppressed.

  For example, when a gate for injecting a molding resin is provided on the opposite side of the movable stopper body 34 in the valve shaft holder 30, as described above, the upper side of the movable stopper body 34 (more specifically, the movable stopper By forming the notch 36 in the upper part of one end face 34a in the circumferential direction of the body 34, a weld line or parting line formed at the time of molding does not exist in the convex portion 35 of the valve shaft holder 30 The contact resistance (rotational sliding resistance) can be further reduced, the flatness of the sliding surface of the valve shaft holder 30 can be increased, and the axial displacement of the valve shaft 10 can be further suppressed.

  Further, by arranging the convex portions 35 symmetrically on the upper surface of the ceiling portion 32 of the valve shaft holder 30 with respect to the rotational axis O of the valve shaft holder 30, the axial deviation of the valve shaft 10 can be suppressed more effectively. The contact area of the valve shaft holder 30 (the projection 35) with respect to the fixing member 70 is further reduced by disposing the projections 35 at a plurality of locations around the rotation axis O of the valve shaft holder 30. Is possible.

  Of course, the shape, number, position, etc. of the projections 35 provided on the upper surface of the ceiling 32 of the valve shaft holder 30 are not limited to the illustrated example, and the projections 35 may be omitted. Good.

  Further, between the terraced surface (stepped portion) 15 formed between the upper small diameter portion 11 and the middle large diameter portion 12 of the valve stem 10 and the lower surface of the ceiling portion 32 of the valve stem holder 30, The valve shaft 10 and the above-mentioned valve shaft 10 and the above are inserted so as to be externally inserted into the upper small diameter portion 11 of the valve shaft 10 with the disc-like presser plate (washer) 61 disposed on the lower surface side of the ceiling portion 32 of the valve shaft holder 30 interposed therebetween. A cylindrical compression coil spring which urges the valve shaft holder 30 away from the valve shaft holder 30 in the raising and lowering direction (axial line O direction), in other words, always urges the valve shaft 10 (valve body 14) downward (valve closing direction). The (biasing member) 60 is contracted.

  The valve body 40 is made of, for example, a metal cylinder such as brass or SUS. The valve main body 40 has a valve chamber 40a into which a fluid is introduced and discharged, and the first conduit 41a is connected and fixed to the first transverse opening 41 provided on the side of the valve chamber 40a by brazing or the like. (The intermediate large diameter portion 12 of the valve shaft 10 is relatively movable (slidable) in the direction of the axis O in the ceiling portion of the valve chamber 40a and is inserted in a relatively rotatable state about the axis O) 43 and a lower part (fitting part 27) of the guide bush 20 are formed to form a fitting hole 44 to be fitted and fixed, and the second vertical opening 42 provided at the lower part of the valve chamber 40a 2 The conduits 42a are connected and fixed by brazing or the like. Further, on the bottom wall 45 between the valve chamber 40a and the second opening 42, a stepped valve port 46 having a valve seat 46a with which the valve body 14 contacts and separates is formed.

  An annular cage plate 47 is caulked on the outer periphery of the upper end portion of the valve body 40 (outside of the guide bush 20 in the valve body 40) and fixed by brazing or the like, and provided on the periphery of the cage plate 47 The lower end portion of a cylindrical can 55 with a ceiling is sealingly joined to the stepped portion by butt welding or the like.

  Further, in the present embodiment, the upper surface (the surface on the side of the can 55) of the wedge plate 47 engages with the lower stopper 25 to prevent the relative rotation of the lower stopper 25 with respect to the guide bush 20. A stopper pressing (pressing member) 48 formed of a plate-like member is disposed and fixed.

  The stopper presser 48 is made of, for example, a metal member such as brass or SUS by press processing or the like, and basically (the upper surface of the valve main body 40) and (the upper surface of the hooked plate 47 provided on the valve main body 40) And the outer peripheral portion (portion outside the annular step portion 48c) is brought into contact with (the upper surface of) the hook-like plate 47. It is fixed by welding, welding, adhesion, etc.

  More specifically, as well as referring to FIGS. 3 and 4 together with FIG. 1, the stopper presser 48 is encased by the lower stopper 25 and is disposed apart from (the upper surface of) the valve main body 40 And a mounting / fixing portion 48b provided on the outer periphery of the exterior supporting portion 48a via the step portion 48c and fixed to a hook-like plate 47 provided on the outer periphery of the valve main body 40.

  The exterior support portion 48a is formed with a fitting insertion hole 48d through which the lower stopper 25 is inserted, and adjacent to the fitting insertion hole 48d (in other words, on the outer peripheral portion of the fitting insertion hole 48d) Three supporting claws 49a, 49b, 49c for holding (the outer surface of) 25 are erected. The three support claws 49a, 49b, 49c are provided to face the outer surface of the lower stopper 25 and are relatively small (relatively small in circumferential width and height) support claws. 49c is adjacent to the fan-shaped portion 48e in which the fixed stopper body 24 in a plan view fan shape in the insertion hole 48d is inserted (specifically, the valve opening direction side of the fixed stopper body 24 inserted in the fan-shaped portion 48e) Placed adjacent to the side). In addition, a fixed stopper body 24 is provided on an outer peripheral portion of the fan-shaped portion 48e (specifically, a portion adjacent to a side opposite to the side surface on the valve opening direction side of the fixed stopper body 24 inserted in the fan-shaped portion 48e). Support claws 49d are erected so as to face the outer surface of the support claws 49d, and the support claws 49d hold the both sides in the circumferential direction of the fixed stopper body 24 together with the support claws 49c.

  On the other hand, the mounting and fixing portion 48b is joined and fixed to a substantially central portion of (the upper surface of) the wedge-shaped plate 47 by welding, welding, adhesion or the like (joining portion K). It is connected non-rotatably with respect to (the fixing screw 23 of) the bush 20.

  In addition, on the upper surface of the wedge plate 47 (more specifically, on the inner side than the portion in contact with the attachment fixing portion 48b), the flow of brazing material when brazing the wedge plate 47 to the valve main body 40 is prevented. An annular groove 47a is attached.

  A rotor 51 is rotatably disposed inside the can 55 and outside the guide bush 20 and the valve shaft holder 30, and a yoke 52a is provided outside the can 55 so as to rotationally drive the rotor 51. A stator 52 including a bobbin 52b, a stator coil 52c, and a resin mold cover 52d is disposed. A plurality of lead terminals 52e are connected to the stator coil 52c, and a plurality of lead wires 52g are connected to the lead terminals 52e via the substrate 52f, and distributed in the can 55 by energization excitation to the stator coil 52c. The existing rotor 51 is designed to rotate around the axis O.

  The rotor 51 disposed in the can 55 is engaged with and supported by the valve shaft holder 30, and the valve shaft holder 30 is configured to rotate together with the rotor 51 (integrally).

  In detail, the rotor 51 has a double pipe configuration including an inner cylinder 51a, an outer cylinder 51b, and a connecting portion 51c connecting the inner cylinder 51a and the outer cylinder 51b at a predetermined angular position around the axis O, A longitudinal groove 51 d extending in the direction of the axis O (vertical direction) (for example, at an angular interval of 120 degrees around the axis O) is formed on the inner periphery of the inner cylinder 51 a.

  On the other hand, on the outer periphery (upper half of the valve shaft holder 30), as is well understood with reference to FIG. 2, a tapered surface portion 30c consisting of a truncated conical surface is provided at the upper end thereof. In the upper and lower direction (for example, at an angular interval of 120 degrees around the axis O), projecting ridges 30a are provided, and on the lower sides of the ridges 30a, an upward engaging surface 30b for supporting the rotor 51. Is formed.

  Thus, the vertical groove 51d of the inner cylinder 51a of the rotor 51 engages with the projection 30a of the valve shaft holder 30, and the lower surface of the inner cylinder 51a of the rotor 51 and the locking surface 30b of the valve shaft holder 30 By abutting, the rotor 51 is supported and fixed on the outer periphery in a state of being aligned with the valve shaft holder 30, and the valve shaft holder 30 supports the rotor 51 in the can 55 while the rotor 51 is supported. Co-rotated with

  In the present embodiment, the rotor 51 is engaged with and supported by the valve shaft holder 30 so that the upper surface of the valve shaft holder 30 is flush with or slightly above the upper surface of the inner cylinder 51a of the rotor 51. There is.

  The relative movement between the valve shaft holder 30 and the rotor 51 in the vertical direction is prevented above the rotor 51 and the valve shaft holder 30 (in other words, the rotor 51 is pressed downward against the valve shaft holder 30 to prevent removal) In order to connect the valve stem 10 and the valve stem holder 30 with each other, a fixing member 70 externally fitted and fixed to the upper end portion of (the upper small diameter portion 11 of) the valve stem 10 is disposed.

  The fixing member 70 is made of, for example, a metal member such as brass or SUS by press working, cutting, etc., and is externally fitted to the upper end portion of (the upper small diameter portion 11 of) the valve shaft 10 for press fitting, welding, welding , A stepped cylindrical fixing portion 71 including a small diameter upper portion 71a and a large diameter lower portion 71b joined and fixed by adhesion or the like, and an inner cylinder 51a of the rotor 51 from the lower end portion of the fixing portion 71 (large diameter lower portion 71b) And a disk-like flange portion 72 extending outward to the vicinity.

  The lower surface of the flange portion 72 is opposed to the upper surface of the valve shaft holder 30 and the upper surface of (the inner cylinder 51a of the rotor 51), and the convex portion 35 (upper surface) provided on the upper surface of the valve shaft holder 30 And the rotor 51 (the upper surface of the inner cylinder 51a of the rotor 51).

  As described above, the rotor 51 is held between the valve shaft holder 30 urged upward by the urging force of the compression coil spring 60 and the fixing member 70 (the outer peripheral portion of the flange portion 72) to prevent it from coming off It is locked.

  Further, the valve shaft holder 30 is moved to the upper side relative to the guide bush 20 too much during operation of the fixing member 70 (the large diameter lower portion 71b of the fixing portion 71 in the fixing member 70 fixed to the upper end portion of the valve shaft 10). A return spring comprising a coil spring biasing the valve shaft holder 30 toward the guide bush 20 in order to prevent disengagement of the fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30; There are 75 exteriors.

  Then, in the motor-operated valve 1, for example, the valve body 14 is at the lowest position (home position) in order to prevent the valve body 14 from sticking to the valve seat 46a and to ensure controllability in a low flow rate region. Sometimes, a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a.

  The assembling process of the motor-operated valve 1, particularly, the process of bringing out the home position (the most lowered position) of the valve body 14 will be described in detail. First, the valve shaft 10, guide bush 20, lower stopper 25, compression coil spring 60, valve shaft holder 30 , The rotor 51, the valve main body 40, the bowl-like plate 47 and the like. For example, after brazing the flanged plate 47 to the valve main body 40 and press-fitting the guide bush 20 to the valve main body 40, the lower stopper 25 is screwed to (the fixing screw portion 23 of) the guide bush 20 Assemble the At this time, the lower stopper 25 is screwed to the guide bush 20 so as to be capable of relative rotation. The lower stopper 25 may be disposed in contact with the stopper portion 27a of the guide bush 20 at this stage, or may be spaced apart from the stopper portion 27a. Subsequently, the valve body 14 provided at the lower end portion of the valve shaft 10 abuts (seats) the valve seat 46 a, and the compression coil spring 60 is slightly compressed, and the movable stopper 34 and the lower stopper 25 of the valve shaft holder 30 The fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30 are until the fixed stopper body 24 abuts and the lower stopper 25 (the lower surface thereof) abuts the stopper portion 27a of the guide bush 20 The screw shaft holder 30, the rotor 51, and the valve shaft 10 are lowered while being rotated by using a screw feed mechanism 28 consisting of Then, in the state where the valve shaft holder 30 is disposed at the lowermost position as described above, the fixing member 70 is externally fitted and fixed to the upper end portion of the valve shaft 10 by press fitting, welding, welding, adhesion or the like (seating state).

  Next, from the above-mentioned seating state, the assembly including the valve shaft 10, the valve shaft holder 30, the rotor 51, the fixing member 70, etc. is integrally raised while being rotated using the screw feed mechanism 28 to guide bushes. After removing it from 20, place the stopper presser 48 on the valve body 40 and the hook plate 47 while putting it on the lower stopper 25 so as to drop it from above, and place the lower stopper 25 with the stopper presser 48 against the guide bush 20 It is rotated by a predetermined rotation angle in the valve opening direction (for example, counterclockwise in plan view). The lower stopper 25 is fixed to the guide screw 20 (fixed screw 23 of the guide bush 20) by joining and fixing the stopper presser 48 (attachment fixing portion 48b thereof) to the hooked plate 47 of the valve main body 40 by welding, welding, adhesion or the like. After the coupling and fixing are performed so as not to allow relative rotation (see FIGS. 4A and 4B), the assembly is assembled to the guide bush 20 again using the screw feed mechanism 28. As a result, the position of the lower stopper 25 relative to the guide bush 20 of the fixed stopper body 24 changes, so the movable stopper body 34 of the valve shaft holder 30 and the fixed stopper body 24 of the lower stopper 25 abut each other. Even in the lowest position, a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a.

  The lower stopper 25 is rotated by a predetermined rotation angle in the valve opening direction with respect to the guide bush 20 before attaching the stopper presser 48 to the lower stopper 25, and then the stopper presser 48 is mounted on the lower stopper 25 It may be joined and fixed to the hook-like plate 47 of the main body 40.

  In the motor-operated valve 1 having such a configuration, when the rotor 51 is rotated by energization and energization of the stator 52 (the stator coil 52c thereof), the valve shaft holder 30 and the valve shaft 10 are rotated integrally therewith. At this time, the valve shaft 10 is moved up and down together with the valve body 14 by the screw feed mechanism 28 composed of the fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30. The clearance (lift amount, valve opening) between the valve seat 46a and the valve seat 46a is increased or decreased to adjust the flow rate of the fluid such as the refrigerant. Further, even when the movable stopper body 34 of the valve shaft holder 30 and the fixed stopper body 24 of the lower stopper 25 fixed to the guide bush 20 abut, and the valve body 14 is at the lowest position, the valve body 14 and the valve seat Since a gap is formed between 46a, a predetermined amount of passing flow rate is secured.

  Thus, in the motor operated valve 1 of the present embodiment, the exterior support portion 48a attached to the lower stopper 25 is disposed apart from the valve main body 40 in the stopper presser 48 and provided on the outer periphery of the exterior support portion 48a. The mounting fixing portion 48b is mounted and fixed to the hook-like plate 47 fixed to the valve main body 40, and the exterior support portion 48a does not abut on the valve main body 40. The stopper press 48 is not inclined relative to the valve body 40 as compared to a conventional motor-operated valve which is manufactured and almost entirely contacts the valve body, and the stopper press 48 can be carried out with respect to the valve body 40 or the wedge plate 47. Can be precisely placed and fixed.

  In addition, for example, the contact surface (attachment fixing portion 48b) with the valve body 40 or the hook-like plate 47 may be smaller than the conventional motorized valve in which almost the entire pressing member abuts the valve body. Since the accuracy (flatness) can be easily secured, the stopper presser 48 can be finely arranged and fixed with respect to the valve main body 40 or the hook-like plate 47 also by this.

  In the above embodiment, when the valve body 14 is at the lowermost position (usually fully closed), a gap of a predetermined size is formed between the valve body 14 and the valve seat 46 a ( That is, although the valve-less type motor-operated valve in which the valve body 14 is not seated on the valve seat 46a has been described, for example, a motor-operated valve of a type in which the valve body is seated on the valve seat (for example, JP-A-2011-208716) In the case where the lower stopper is connected non-rotatably to (the fixing screw portion of) the guide bush using the same stopper press (pressing member) as in the above, the same operation and effect as described above can be obtained. There is no need to go into detail.

DESCRIPTION OF SYMBOLS 1 Motor-operated valve 10 Valve shaft 14 Valve body 20 Guide bush 21 Cylindrical part 23 Fixing screw part (male screw part)
24 fixed stopper body 25 lower stopper 28 screw feeding mechanism 29 lower stopper mechanism 30 valve shaft holder 31 cylindrical portion 32 ceiling portion 33 movable screw portion (female screw portion)
34 movable stopper 35 convex part 40 valve main body 40a valve chamber 41 first opening 41a first conduit 42 second opening 42a second conduit 43 insertion hole 44 fitting hole 45 bottom wall 46 valve opening 46a valve seat 47 hooked plate 47a Annular groove 48 Stopper presser (pressing member)
48a Exterior support portion 48b Fixing portion 48c Stepped portion 50 Stepping motor 51 Rotor 52 Stator 55 Can 60 Compression coil spring 70 Fixing member 71 Fixing portion 71a Small diameter upper portion 71b Large diameter lower portion 72 Flange portion O Axis

Claims (6)

A valve stem provided with a valve body,
A guide bush in which the valve shaft is axially relatively movable and relatively rotatably inserted;
A valve body having a valve port with a valve seat to which the valve body contacts and separates, and to which the guide bush is attached and fixed;
A valve stem holder connected to the valve stem;
A motor having a rotor and a stator for rotating the valve shaft holder relative to the guide bush;
A screw feed mechanism provided between the guide bush and the valve shaft holder for moving the valve element of the valve shaft up and down with respect to the valve seat of the valve body according to the rotational drive of the rotor; ,
A lower stopper mechanism having a movable stopper body provided on the valve shaft holder and a fixed stopper body provided on a lower stopper attached to the guide bush for restricting the rotation downward movement of the valve shaft holder;
A motorized valve including a pressing member for preventing relative movement of the lower stopper with respect to the guide bush,
The pressing member is mounted on the lower stopper, and is provided on an outer periphery of the exterior support portion spaced apart from the valve main body, and the exterior support portion, and is an attachment fixing portion fixed to the valve main body. And a motorized valve characterized by having:   The motor-operated valve according to claim 1, wherein a step portion is provided between the exterior support portion and the mounting and fixing portion.   The exterior support portion is provided with a fitting hole through which the lower stopper is inserted, and a plurality of support claws for holding the lower stopper are provided upright adjacent to the fitting hole. The motor operated valve according to claim 1 or 2.   The electric motor according to any one of claims 1 to 3, wherein the attachment fixing portion of the pressing member is fixed to a hook-like plate provided on the outer side of the guide bush in the valve main body. valve.   The motor-operated valve according to claim 4, wherein a can is joined to an outer periphery of the bowl-shaped plate.   The motor-operated valve according to any one of claims 1 to 5, wherein an annular recessed groove is provided on the inner side of a portion of the valve body in contact with the mounting fixing portion.

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