JP6684836B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor-operated valve that is used by being incorporated as a flow control valve in a refrigeration cycle such as an air conditioner or a refrigerator.

  As an electrically operated valve of this type, for example, a valve shaft having a valve element provided at a lower end portion thereof, and a guide bush having a cylindrical portion in which the valve shaft is relatively movable in the axial direction and relatively rotatable in the axial direction, A valve body having a valve seat portion (valve seat) for contacting and separating the valve body, to which the guide bush is attached and fixed, a cylindrical portion into which the guide bush is inserted, and an insertion portion through which an upper end portion of the valve shaft is inserted. A valve shaft holder that has a ceiling portion having a hole formed therethrough and is fixedly connected to the valve shaft, and between the valve shaft and the valve shaft holder to urge the valve body in a valve closing direction. A biasing member interposed, a motor having a rotor and a stator for rotating the valve shaft holder with respect to the guide bush, a fixing screw portion formed on the outer periphery of the guide bush, and the valve shaft holder. Movable screw part formed on the inner circumference And a screw feed mechanism for raising and lowering the valve body of the valve shaft with respect to the valve seat portion (valve seat) in accordance with rotational driving of the rotor, and rotational downward motion restriction of the valve shaft holder. Therefore, a lower stopper mechanism including a fixed stopper body provided on a lower stopper having a female screw portion screwed to the fixing screw portion of the guide bush and a movable stopper body provided on the valve shaft holder is provided. 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 at the lowest position (for example, See Patent Document 1).

  In an air conditioner using a valve-less type motor-operated valve as described above, even when the valve body is at the lowest position (normally in the fully closed state), a gap of a predetermined size is formed between the valve seat and the valve seat. Therefore, for example, when performing the dehumidifying operation at midnight, it is possible to operate with the amount of refrigerant reduced without fully closing the electrically operated valve, and suppress the generation of operating noise due to the on / off of the electrically operated valve. be able to. In addition, the electrically operated valve as described above has an advantage over the ordinary electrically operated valve of the closed valve type in that it can surely prevent the valve body from biting the valve seat.

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 is engaged with a lower stopper having a fixed stopper body that constitutes a stopper mechanism. There is a case where the lower stopper is non-rotatably connected to the guide bush and positioned by using a stopper presser (pressing member) that prevents the lower stopper from rotating relative to the guide bush.

  For example, in the conventional electric valve disclosed in Patent Document 1, the stopper retainer and the lower stopper are configured as separate parts, and after the lower stopper is screwed to the guide bush so as to be rotatable relative to the guide bush, It is necessary to position the stopper holder with respect to the lower stopper and fix the exterior. Therefore, the number of parts and the number of assembling steps are increased, and the assembling process may be complicated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric valve that can reduce the number of parts and the number of assembling steps and can simplify the assembling process. .

In order to solve the above-mentioned problems, a motor-operated valve according to the present invention basically comprises a valve shaft provided with a valve body and a guide into 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 opening with a valve seat, and to which the guide bush is attached and fixed; a valve shaft holder connected to the valve shaft; and a valve shaft holder for rotating the valve shaft holder with respect to the guide bush. A motor having a rotor and a stator; and a screw feed mechanism provided between the guide bush and the valve shaft holder for moving the valve element up and down with respect to the valve seat in response to rotational driving of the rotor. 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 downward movement of the valve shaft holder. That a lower stopper mechanism, and a pressing member to prevent relative movement with respect to the guide bush of the lower stopper is constituted the pressing and member and the lower stopper is in one piece, the pressing with a member and the lower stopper It is characterized by being integrated by welding, welding, adhesion, caulking, or insert molding .

  In another preferred aspect, a part of the pressing member is fixed to a side surface of the lower stopper.

  In another preferred aspect, a part of the pressing member is embedded in the lower stopper.

  In another preferred aspect, the pressing member is integrated with the lower stopper via a support portion that is elastically deformable in the circumferential direction.

  In a further preferred aspect, the support portion is provided with a curved portion formed to have a predetermined radius when viewed in the radial direction.

  In another preferred aspect, the stator is arranged outside a cylindrical can joined to the valve body, and the rotor is arranged inside the can and is integrally rotatably connected to the valve shaft holder. It

  According to the present invention, since the pressing member and the lower stopper are configured as one part, the number of parts and the number of assembling steps are smaller than those of the conventional one in which the pressing member and the lower stopper are configured as separate parts. Besides, the assembling process can be simplified.

  Further, since the pressing member is integrated with the lower stopper via the support portion that is elastically deformable in the circumferential direction, for example, when performing initialization (starting the origin of the electric valve), the movable member provided on the valve shaft holder is movable. When the stopper body collides with the fixed stopper body provided in the lower stopper, the supporting portion is elastically deformed (flexed) in the circumferential direction, and the impact (in the circumferential direction) is relieved, so that the initialization is performed. It is possible to effectively reduce collision noise (initialization noise) when performing (electrically operated valve starting point) and abrasion between stopper bodies.

  Further, after the collision, the lower stopper supported by the supporting portion can be returned to the original position or posture by the elastic force (repulsive force) of the supporting portion, so that the controllability of the passage flow rate is ensured. You can

1 is a longitudinal sectional view showing a first embodiment of a motor-operated valve according to the present invention. The valve shaft holder shown by FIG. 1 is shown, (A) is a perspective view, (B) is a top view. The stopper retainer shown in FIG. 1 is shown separately, (A) is a perspective view, and (B) is a top view. FIG. 3 is a perspective view showing an internal structure of the motor-operated valve shown in FIG. 1 (a state in which a lower stopper and a stopper retainer are attached). The side view of FIG. The top view of FIG. The perspective view which shows the internal structure (state which attached the lower stopper and stopper retainer) of 2nd Embodiment of the motor operated valve which concerns on this invention. The side view of FIG. The top view of FIG. FIG. 8 is a perspective view showing a lower stopper with a stopper holder shown in FIG. 7. FIG. 8 is a hexahedral view showing a lower stopper with a stopper retainer shown in FIG. 7. The perspective view which separates and shows the stopper press shown in FIG. FIG. 8 is a six-sided view showing the stopper retainer shown in FIG. 7 separately.

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

  In addition, in each drawing, a gap formed between members, a separation distance between members, and the like may be exaggerated for easier understanding of the invention and for convenience of drawing. is there. Further, in this specification, the description of the position and direction such as up and down, left and right is based on the direction arrow display in FIG. 1, and does not indicate the position and direction in the actual use state.

[First Embodiment]
FIG. 1 is a vertical sectional view showing a first 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 in a refrigeration cycle such as an air conditioner or a refrigerator, and mainly includes a valve shaft 10 provided with a valve body 14 and a guide. The bush 20, the valve shaft holder 30, the valve body 40, the can 55, the stepping motor 50 including the rotor 51 and the stator 52, the compression coil spring (biasing member) 60, and the fixing member 70 as a stopper. A screw feeding mechanism 28 and a lower stopper mechanism 29 are provided.

  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 at the lower end portion of the lower small diameter portion 13. The stepped inverted conical valve body 14 for controlling the passage flow rate of is integrally formed.

  The guide bush 20 has a cylindrical portion 21 inserted therein such that (the intermediate large diameter portion 12 of) the valve shaft 10 is relatively movable (sliding) in the direction of the axis O and relatively rotatable around the axis O. It extends upward from the upper end of the cylindrical portion 21, has an inner diameter larger than that of the cylindrical portion 21, and the upper end side of the intermediate large-diameter portion 12 and the lower end side of the upper small-diameter portion 11 of the valve shaft 10 are inserted. And the installation portion 22. On the outer circumference of the cylindrical portion 21 of the guide bush 20, one of the screw feed mechanisms 28 for raising and lowering the valve body 14 of the valve shaft 10 with respect to the valve seat 46a of the valve body 40 according to the rotational drive of the rotor 51 is configured. A fixed 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 into the fitting hole 44 of the valve body 40. A lower stopper 25 is screwed to (on the lower side of the valve shaft holder 30 in) the fixing screw portion 23, and a lower stopper that restricts the downward movement of the valve shaft holder 30 is provided on the outer periphery of the lower stopper 25. A fixed stopper body 24 constituting one side of the mechanism 29 is integrally projected. In this example, the upper surface 27a of the fitting portion 27 serves as a stopper portion that regulates the lower movement of the lower stopper 25 (in other words, defines the position of the lower stopper 25 in the seated state described later).

  Further, in the present example, a stopper presser (pressing member) 48 is attached (exterior) to the lower stopper 25 attached to (the fixing screw portion 23 of) the guide bush 20. 25 is non-rotatably connected to (the fixing screw portion 23 of) the guide bush 20 (detailed later).

  The valve shaft holder 30 is, for example, made of resin (preferably made of resin reinforced with high wear resistance such as SUS or carbon fiber in consideration of contact with the fixing member 70), and the guide bush 20 is The cylindrical portion 31 to be inserted and the upper end portion of (the upper small diameter portion 11 of) the valve shaft 10 are penetrated by an insertion hole 32a which is inserted (in a state of being relatively movable in the direction of the axis O and relatively rotatable about the axis O). It has the ceiling part 32 provided. A movable screw portion (female screw portion) 33 that is screwed with the fixing screw portion 23 of the guide bush 20 to form the screw feeding mechanism 28 is formed in the lower inner peripheral portion of the cylindrical portion 31 of the valve shaft holder 30. At the same time, the upper part of the inner circumference of the cylindrical portion 31 is brought into contact (sliding contact) with the outer circumference of the cylindrical extending portion 22 of the guide bush 20. A movable stopper body 34, which constitutes the other side of the lower stopper mechanism 29, is integrally provided on the lower end of the outer periphery of the cylindrical portion 31 so as to project.

  Further, the top 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) is seen in plan view (the axis line Two convex portions 35 each having a substantially fan shape (as viewed in the O direction) (here, a fan shape having a central angle of about 90 degrees) are integrally formed. Specifically, the two convex portions 35 are provided on the upper surface of the ceiling portion 32 around the insertion hole 32a (in other words, around the rotation axis O of the valve shaft holder 30) on the opposite side to the axis O (in other words, the valve shaft). The holder 30 is provided so as to project upward at a position symmetrical with respect to the rotation axis O of the holder 30, and in the meantime (in this example, a portion above the one end face 34a in the circumferential direction of the movable stopper body 34, that is, the direction of the axis O). When viewed from above, the movable stopper body 34 has a notched shape in a portion including the same position as the one end face 34a in the circumferential direction of the movable stopper body 34 (substantially fan-shaped in plan view (here, the central angle is approximately 90 degree fan-shaped notch 36).

  Since the contact area of the valve shaft holder 30 with respect to the fixing member 70 is reduced by the convex portion 35, for example, the contact resistance (rotational sliding resistance) when the valve shaft holder 30 contacts the fixing member 70 is reduced.

  Further, for example, when the valve shaft holder 30 is made of a molded product such as a resin, the positions of the weld line and the parting line formed at the time of molding are aligned with the positions of the notches 36, that is, the weld line is formed at the time of molding. By providing the notch 36 at the position where the line or parting line is formed, the contact resistance (rotational sliding resistance) can be further reduced, and the flatness of the sliding surface of the valve shaft holder 30 can be increased. The axis shift of the valve shaft 10 can be further suppressed.

  For example, when the gate for injecting the molding resin is provided on the opposite side of the movable stopper body 34 in the valve shaft holder 30, as described above, above the movable stopper body 34 (more specifically, the movable stopper body 34). By providing the notch 36 in the upper portion of the one end surface 34a in the circumferential direction of the body 34, the convex portion 35 of the valve shaft holder 30 has no weld line or parting line formed during molding. 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 disposing the convex portion 35 symmetrically with respect to the rotation axis O of the valve shaft holder 30 on the upper surface of the ceiling portion 32 of the valve shaft holder 30, axial deviation of the valve shaft 10 can be suppressed more effectively. By further disposing the convex portions 35 at a plurality of locations around the rotation axis O of the valve shaft holder 30, the contact area of (the convex portion 35 of) the valve shaft holder 30 with the fixing member 70 can be further reduced. Is possible.

  It should be understood that the shape, number, position, etc. of the convex portions 35 provided on the upper surface of the ceiling portion 32 of the valve shaft holder 30 are not limited to the illustrated examples, and the convex portions 35 may be omitted. Good.

  Further, between the terrace surface (step portion) 15 formed between the upper small diameter portion 11 and the intermediate large diameter portion 12 of the valve shaft 10 and the lower surface of the ceiling portion 32 of the valve shaft holder 30, the The disc-shaped pressing plate (washer) 61 arranged on the lower surface side of the ceiling portion 32 of the valve shaft holder 30 is sandwiched between the valve shaft 10 and the valve shaft 10 so that the disc shaft is externally inserted into the upper small-diameter portion 11 of the valve shaft 10. Cylindrical compression coil spring that urges the valve shaft holder 30 away from each other in the vertical direction (axis O direction), in other words, always urges the valve shaft 10 (valve element 14) downward (valve closing direction). The (biasing member) 60 is contracted.

  The valve body 40 is composed of a metal cylindrical body such as brass or SUS. The valve body 40 has a valve chamber 40a into which a fluid is introduced and led out, and a first conduit 41a is connected and fixed by brazing or the like to a lateral first opening 41 provided at a side portion of the valve chamber 40a. An insertion hole through which the valve shaft 10 (the intermediate large-diameter portion 12 thereof) is relatively movable (sliding) in the direction of the axis O and is relatively rotatable around the axis O in the ceiling of the valve chamber 40a. 43 and a lower portion (fitting portion 27) of the guide bush 20 are fitted to each other to form a fitting hole 44. The fitting hole 44 is formed in the lower portion of the valve chamber 40a. The two conduits 42a are connected and fixed by brazing or the like. In addition, a stepped valve port 46 having a valve seat 46a with which the valve element 14 comes in and out (approaches and deviates) is formed in the bottom wall 45 between the valve chamber 40a and the second opening 42. .

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

  Further, in this example, a stepped schematic disc fixed to the lower stopper 25 and preventing relative rotation of the lower stopper 25 with respect to the guide bush 20 is provided on the upper surface (the surface on the side of the can 55) of the collar plate 47. A stopper presser (presser member) 48 made of a strip-shaped member is arranged and fixed.

  The stopper retainer 48 is made of, for example, a metal member such as brass or SUS by press working or the like, and is basically (the upper surface of) the valve body 40 and an upper surface of the collar-shaped plate 47 (which is provided on the valve body 40). ) Is secured (fixed) to the lower stopper 25 in a state of being separated (floated) from (), and its outer peripheral portion (portion outside the annular step portion 48c) is brought into contact with (the upper surface of) the collar plate 47. It is joined and fixed by welding, welding, adhesion, etc.

  For details, referring to FIG. 3 to FIG. 6 together with FIG. 1, the stopper presser 48 is mounted (exterior) and fixed to the lower stopper 25, and the valve body 40 (upper surface). A disk-shaped mounting support portion 48a that is spaced apart from the mounting support portion 48a and a collar-shaped plate 47 that is provided on the outer periphery of the mounting support portion 48a via a step portion 48c and is provided on the outer periphery of the valve body 40. And a ring-shaped attachment fixing portion 48b.

  A fitting insertion hole 48d having a size through which the lower stopper 25 is inserted is formed in the mounting support portion 48a, and is adjacent to the fitting insertion hole 48d (in other words, on the outer peripheral portion of the fitting insertion hole 48d). Three support claws 49a, 49b, 49c which are rectangular in a side view and which sandwich (the outer surface of) the lower stopper 25 are provided upright. These three support claws 49a, 49b, 49c are raised so as to face the outer surface of the lower stopper 25, and are relatively small (the width and height in the circumferential direction are relatively small) of them. The claw 49c is adjacent to the fan-shaped portion 48e into which the fan-shaped fixed stopper body 24 in the plan view of the fitting insertion hole 48d is fitted (specifically, the fixed stopper body 24 fitted into the fan-shaped portion 48e is located in the valve opening direction side). (Adjacent to the side of). In addition, the outer peripheral portion of the fan-shaped portion 48e (specifically, the portion adjacent to the side surface on the valve closing direction side opposite to the side surface on the valve opening direction side of the fixed stopper body 24 fitted and inserted in the fan-shaped portion 48e). A rectangular supporting claw (supporting portion) 49d as viewed in the circumferential direction is provided upright so as to face the outer surface (side surface on the valve closing direction side) of the fixed stopper body 24. Both side surfaces in the circumferential direction of the fixed stopper body 24 are held together with the support claw 49c.

  Further, in this example, a curved portion (also referred to as an R-shaped portion) 49e formed to have a predetermined radius when viewed in the radial direction (lateral direction) is provided at the lower end portion (root portion) of the support claw 49d. The support claw 49d is provided and is elastically deformable in the circumferential direction.

  For example, when the movable stopper body 34 provided on the valve shaft holder 30 collides with the fixed stopper body 24 provided on the lower stopper 25 in performing initialization (starting the origin of the motor-operated valve 1), the support claw 49d is circumferentially moved. By elastically deforming (bending), the impact (in the circumferential direction) is alleviated, and after the collision, the elastic force (repulsive force) of the support claw 49d causes the support claw 49d to support the impact. The lower stopper 25 (the fixed stopper body 24 of the lower stopper) is pushed back to its original position or posture.

  Further, the movable stopper body 34 and the fixed stopper body 24 are made of resin reinforced with SUS or carbon fiber, for example, so that abrasion due to impact can be suppressed and deviation of the base point at the time of initialization can be prevented. .

  In this example, for example, the support claws 49a, 49b, 49c, and 49d described above are joined (fixed) to the lower stopper 25 by welding, welding, bonding, caulking, or the like so that the lower stopper 25 and the stopper retainer 48 are integrated. (As one component).

  On the other hand, the attachment fixing portion 48b of the stopper retainer 48 is joined and fixed to the substantially central portion of (the upper surface of) the collar plate 47 by welding, welding, bonding or the like (joint portion K), whereby the lower stopper. 25 is connected to the guide bush 20 (fixing screw portion 23 thereof) so as not to be rotatable relative thereto.

  When the stopper retainer 48 is welded and fixed to the collar plate 47, it is desirable that these members are made of the same material (or have the same melting point). In this example, for example, brass or SUS may be used.

  In order to prevent the flow of brazing material when brazing the collar plate 47 to the valve body 40, the upper surface of the collar plate 47 (more specifically, the inner side of the portion in contact with the attachment fixing portion 48b). The 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 to rotate the rotor 51. A stator 52 including a bobbin 52b, a stator coil 52c, and a resin mold cover 52d is arranged. 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 a substrate 52f. The existing rotor 51 is adapted to rotate around the axis O.

  The rotor 51 arranged in the can 55 is engaged with and supported by the valve shaft holder 30, and the valve shaft holder 30 rotates together with the rotor 51 (integrally).

  Specifically, the rotor 51 has a double pipe configuration including an inner cylinder 51a, an outer cylinder 51b, and a connecting portion 51c that connects the inner cylinder 51a and the outer cylinder 51b at a predetermined angular position around the axis O, Vertical grooves 51d extending in the direction of the axis O (vertical direction) (for example, at an angular interval of 120 degrees around the axis O) are formed on the inner circumference of the inner cylinder 51a.

  On the other hand, on the outer periphery (upper half portion) of the valve shaft holder 30, a tapered surface portion 30c formed of a truncated cone surface is provided on the upper end, and the lower side of the tapered surface portion 30c can be seen by referring to FIG. A projecting ridge 30a extending in the vertical direction (for example, at an angular interval of 120 degrees around the axis O) is provided on the lower side of the projecting ridge 30a. Are formed.

  Thus, the vertical groove 51d of the inner cylinder 51a of the rotor 51 and the protrusion 30a of the valve shaft holder 30 are engaged with each other, and the lower surface of the inner cylinder 51a of the rotor 51 and the locking surface 30b of the valve shaft holder 30 are engaged. By abutting, the rotor 51 is supported and fixed to the outer periphery of the rotor 51 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 being supported. Is rotated with.

  In this example, 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.

  Above the rotor 51 and the valve shaft holder 30, the valve shaft holder 30 and the rotor 51 are prevented from moving relative to each other in the vertical direction (in other words, the rotor 51 is pressed downward against the valve shaft holder 30 to prevent the valve shaft holder 30 from coming off. In order to connect the valve shaft 10 and the valve shaft holder 30 with each other, a fixing member 70 externally fitted and fixed to the upper end of the valve shaft 10 (the upper small diameter portion 11 thereof) is provided.

  The fixing member 70 is made of, for example, a metal member such as brass or SUS by press work, cutting work, or the like, and is press-fitted, welded, or welded to the upper end of the valve shaft 10 (the upper small diameter portion 11 thereof). , A stepped cylindrical fixing portion 71 consisting of 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 large diameter lower portion 71b of) the fixing portion 71. And a disk-shaped flange portion 72 extending outward to the vicinity.

  The lower surface of the flange portion 72 faces the upper surface of the valve shaft holder 30 and the upper surface of (the inner cylinder 51a of) the rotor 51, and (the upper surface) of the convex portion 35 provided on the upper surface of the valve shaft holder 30. The rotor 51 and the rotor 51 (the upper surface of the inner cylinder 51a thereof) are brought into contact with each other.

  As described above, the rotor 51 is sandwiched between the valve shaft holder 30 and the fixing member 70 (the outer peripheral portion of the flange portion 72) that is biased upward by the biasing force of the compression coil spring 60, and the rotor 51 is prevented from coming off. Be locked.

  Further, the valve member 30 fixed to the upper end portion of the valve shaft 10 (the large-diameter lower portion 71b of the fixing portion 71 in the fixing member 70) does not move the valve shaft holder 30 excessively upward with respect to the guide bush 20 during operation. A return spring formed of a coil spring that biases the valve shaft holder 30 toward the guide bush 20 in order to prevent the fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30 from being unscrewed. 75 is installed.

  In the motor-operated valve 1, for example, the valve body 14 is at the lowest position (origin position) in order to prevent the valve body 14 from biting the valve seat 46a and ensure controllability in a low flow rate range. At this time, a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a.

  The step of assembling the motor-operated valve 1, in particular, the step of setting the origin position (lowermost position) of the valve body 14 will be described in detail. First, the valve shaft 10, the guide bush 20, the lower stopper 25, the stopper retainer 48, the compression coil spring 60, The valve shaft holder 30, the rotor 51, the valve body 40, the flange plate 47, etc. are assembled. For example, after the flange plate 47 is brazed to the valve body 40 and the guide bush 20 is press-fitted and fixed to the valve body 40, the lower stopper 25 is screwed to (the fixing screw portion 23 of) the guide bush 20 to lower the lower stopper 25. The stopper retainer 48, which is integrally provided on the valve main body 40 and the collar plate 47, is mounted on the valve main body 40 and the flange plate 47 to assemble them. At this time, the stopper retainer 48 (the attachment fixing portion 48b thereof) is not fixed to the collar plate 47 of the valve body 40, but the lower stopper 25 is screwed so as to be rotatable relative to the guide bush 20. 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 disposed apart from the stopper portion 27a. Next, the valve element 14 provided at the lower end of the valve shaft 10 contacts (seats) the valve seat 46a, the compression coil spring 60 is slightly compressed, and the movable stopper body 34 of the valve shaft holder 30 and the lower stopper 25 are separated. The fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30 until the lower stopper 25 (the lower surface of the lower stopper) abuts the stopper portion 27a of the guide bush 20 until the fixed stopper body 24 abuts. Using the screw feed mechanism 28 consisting of, the valve shaft holder 30, the rotor 51, and the valve shaft 10 are rotated and lowered. Then, with the valve shaft holder 30 placed in the lowest position, the fixing member 70 is externally fitted and fixed to the upper end of the valve shaft 10 by press fitting, welding, welding, bonding or the like (seating state).

  Next, from the seated state, the lower stopper 25 together with the stopper retainer 48 is rotated with respect to the guide bush 20 in the valve opening direction (for example, counterclockwise in plan view) by a predetermined rotation angle, and then the stopper retainer 48 ( The attachment fixing portion 48b) is joined and fixed to the flange plate 47 of the valve body 40 by welding, welding, adhesion or the like, and the lower stopper 25 is connected and fixed to (the fixing screw portion 23 of) the guide bush 20 in a relatively non-rotatable manner. (See FIGS. 4-6). As a result, the position of the fixed stopper 24 of the lower stopper 25 with respect to the guide bush 20 changes, so that the movable stopper 34 of the valve shaft holder 30 and the fixed stopper 24 of the lower stopper 25 come into contact with each other, and the valve shaft holder 30 is Even in the lowest position, a gap having a predetermined size is formed between the valve element 14 and the valve seat 46a.

  In the motor-operated valve 1 having such a configuration, when the rotor 51 is rotated by energizing and exciting the stator 52 (the stator coil 52c of the stator 52), the valve shaft holder 30 and the valve shaft 10 are rotated integrally with the rotor 51. At this time, the valve shaft 10 is moved up and down together with the valve body 14 by the screw feed mechanism 28 including the fixing 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 come into contact with each other and the valve body 14 is at the lowest position, the valve body 14 and the valve seat Since a gap is formed with 46a, a predetermined amount of passing flow rate is secured.

  As described above, in the motor-operated valve 1 of the present embodiment, the stopper retainer 48 and the lower stopper 25 are configured as one component, so that the conventional stopper retainer and the lower stopper are configured as separate components, for example. Compared with, the number of parts and the number of assembling steps can be reduced and the assembling process can be simplified.

  Further, since the stopper retainer 48 is integrated with the lower stopper 25 via the support claw 49d that is elastically deformable in the circumferential direction, the stopper retainer 48 is attached to the valve shaft holder 30 when performing initialization (starting the origin of the electric valve). When the movable stopper body 34 provided collides with the fixed stopper body 24 provided on the lower stopper 25, the supporting claw 49d is elastically deformed (flexed) in the circumferential direction, so that (in the circumferential direction). Since the impact is mitigated, it is possible to effectively reduce the collision noise (initializing noise) and the wear of the stopper bodies when performing the initialization (starting the electric valve from the starting point).

  Further, after the collision, the elastic force (repulsive force) of the support claw 49d can return (the fixed stopper body 24 of) the lower stopper 25 supported by the support claw 49d to the original position or posture. Therefore, the controllability of the passage flow rate can be secured.

[Second Embodiment]
7 to 13 show a second embodiment of the motor-operated valve according to the present invention.

  The motor-operated valve 2 of the second embodiment is different from the motor-operated valve 1 of the first embodiment mainly in the configurations of the stopper retainer 48 and the lower stopper 25, and the other configurations are substantially the same. Therefore, the portions corresponding to the respective portions of the first embodiment are designated by the common reference numerals, and the duplicate description will be omitted. Below, the different points will be mainly described.

  In the motor-operated valve 2 of the present embodiment, the lower stopper 25 and the stopper retainer 48 described above are integrally formed by insert molding, for example.

  More specifically, the mounting support portion 48a of the stopper retainer 48 in the first embodiment is omitted, and a step is formed from (the inner circumference of) the attachment fixing portion 48b of the stopper retainer 48 in the direction of the normal line of the lower stopper 25. A support leg 49f with a portion 49h is extended, and a support claw (support portion) 49d having substantially the same width as the support leg 49f is erected (via the curved portion 49e) at the tip (inner end) of the support leg 49f. The upper part of the support claw 49d is embedded in the lower surface of the lower stopper 25, and the lower stopper 25 and the stopper retainer 48 are integrated (configured as one component). A slightly wider flange portion 49g is formed at the upper end of the support claw 49d embedded in the lower stopper 25.

  In this example, the support leg 49f, the support claw 49d, and the like are provided three at equal angular intervals around the axis O (circumferential direction).

  In other words, in the present embodiment, the support claw 49d with the curved portion 49e embedded in the lower stopper 25 and supporting the lower stopper 25 in the circumferential direction is formed from the lower end portion of the support claw 49d in an approximate manner (of the lower stopper 25). It is fixed to the collar plate 47 of the valve body 40 via a support leg 49f extending in the line direction (having a width substantially the same as the support claw 49d).

  As described above, in the motor-operated valve 2 according to the present embodiment, the stopper retainer 48 and the lower stopper 25 are configured as one component as in the motor-operated valve 1 according to the first embodiment, and therefore the number of components and the number of assembling steps are small. Besides, the assembling process can be simplified.

  In addition, in the motor-operated valve 1 of the first embodiment and the motor-operated valve 2 of the second embodiment, the elastic force (spring force) of the stopper retainer 48 (the mounting support portion 48a and the support leg 49f thereof) and the size of each component part. Since the stopper stopper 48 can urge the lower stopper 25 upward (upward and downward in the upward direction) or downward (downward and downward in the upward direction) by the stopper presser 48 by appropriately setting There is also an advantage that screw backlash between the portion (male screw portion) 23) and the lower stopper 25 (female screw portion thereof) can be eliminated, and the controllability of the flow rate of passage can be enhanced.

  In the above embodiment, when the valve body 14 is at the lowest position (normally in the fully closed state), a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a ( That is, the valveless type electric valve in which the valve body 14 is not seated on the valve seat 46a has been described, but for example, an electric valve of the type in which the valve body is seated on the valve seat (for example, JP2011-208716A). In the case of (1), when the lower stopper is connected to the guide bush (fixing screw portion of the guide bush) in a relatively non-rotatable manner by using the same stopper retainer (retaining member) as described above, the same effect as above can be obtained. It goes without saying that this is detailed.

1 Motorized valve (first embodiment)
2 Motorized valve (second embodiment)
10 valve shaft 14 valve body 20 guide bush 21 cylindrical portion 23 fixing screw portion (male screw portion)
24 Fixed Stopper 25 Lower Stopper 28 Screw Feed Mechanism 29 Lower Stopper Mechanism 30 Valve Shaft Holder 31 Cylindrical Part 32 Ceiling Part 33 Movable Screw Part (Female Screw Part)
34 Movable Stopper 35 Convex 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 Port 46a Valve Seat 47 Collar Plate 47a Annular groove 48 Pressing stopper (pressing member)
48a Mounting support part 48b Mounting fixing part 48c Step part 48d Fitting insertion hole 48e Fan-shaped part 49d Support claw (support part)
49e Curved portion 49f Support leg 49g Flange portion 49h Step portion 50 Stepping motor 51 Rotor 52 Stator 55 Can 60 Compression coil spring 70 Fixing member 71 Fixing portion 72 Flange portion O Axis

Claims (6)

A valve shaft provided with a valve body,
A guide bush 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 valve opening with a valve seat and to which the guide bush is attached and fixed,
A valve shaft holder connected to the valve shaft,
A motor having a rotor and a stator for rotating the valve shaft holder with respect to the guide bush;
A screw feed mechanism provided between the guide bush and the valve shaft holder for moving the valve element up and down with respect to the valve seat in accordance with rotational driving 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 downward movement of the valve shaft holder.
A presser member for preventing relative movement of the lower stopper with respect to the guide bush, the electric valve comprising:
The pressing member and the lower stopper are configured as one part ,
The electrically operated valve, wherein the pressing member and the lower stopper are integrated by welding, welding, bonding, caulking, or insert molding . Electric valve according to claim 1, wherein a part of said pressing member on a side surface of the lower stopper is fixed. Electric valve according to claim 1, wherein a part of said pressing member to said lower stopper is embedded. The pressing member, the electric valve according to any one of claims 1 to 3, characterized in that it is integral with the lower stopper through a support portion which is elastically deformable in the circumferential direction. The electrically operated valve according to claim 4 , wherein the support portion is provided with a curved portion formed to have a predetermined radius when viewed in the radial direction. The stator is arranged outside a cylindrical can joined to the valve body, and the rotor is arranged inside the can and connected to the valve shaft holder so as to be integrally rotatable. The motor operated valve according to any one of claims 1 to 5 .

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