JP6507068B2 - Motor-operated valve and method of assembling the same - Google Patents

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, etc., and in particular, the valve body is in the fully lowered position (usually closed). The present invention also relates to a valve-less type motor-operated valve in which a gap of a predetermined size is formed between the valve-seat portion and the valve-seat portion, and a method of assembling the same.

  As a motorized valve of this type, for example, a guide stem having a valve stem, a cylindrical portion into which the valve stem is inserted, and a cylindrical stem held and fixed at the lower end of the valve stem and inserted in the guide stem The valve holder is inserted into the valve holder so as to be capable of axial relative movement and relative rotation with respect to the valve shaft, and is attached downward by a coil spring compressed between the valve shaft and the valve shaft. A valve body that is biased and retained and locked by the valve holder, and a valve seat portion to which the valve body contacts and separates, and the guide stem is attached and fixed to the valve body A rotor disposed on the inner periphery of the can, a rotor holder for connecting the rotor and the valve shaft via a coupling member fixed to the upper end of the valve shaft, and the rotor Formed on the rotor holder in order to engage , A stator disposed on the outer periphery of the can for rotationally driving the rotor, a female screw member disposed on the inner periphery of the cylindrical portion of the guide stem, and a stationary member formed on the inner periphery of the female screw member A screw feed mechanism for contacting and separating the valve body from the valve seat portion, which comprises a screw portion and a movable screw portion formed on the outer periphery of the valve shaft, and is disposed on the outer periphery of the cylindrical portion of the guide stem A stopper mechanism for restricting rotational movement of the rotor, the stopper mechanism being in contact with the spiral fixing stopper having an upper locking portion and a lower locking portion, and the upper locking portion Ring-shaped or spiral-shaped, provided with a first contact portion to be locked and a second contact portion to be locked in contact with the lower locking portion, and incorporated into the spiral portion of the fixed stopper The slider, and the slider When the rotor rotates, the first contact portion is pushed by the pressing portion provided on the rotor, and the first contact portion is in contact with the upper locking portion and the second contact portion. Is moved up and down while rotating until it contacts the lower locking portion, and at the home position where the second contact portion of the slider is stopped by contacting the lower locking portion, It is known that a gap of a predetermined size is formed between the valve body and the valve seat portion (see, for example, Patent Document 1).

  In the air conditioner using the motor-operated valve having the configuration as described above, there is a gap of a predetermined size between the valve seat and the valve seat even when the valve body is at the lowest position (usually fully closed). As it is formed, for example, when dehumidifying operation is performed at midnight, it can be operated in a state where the amount of refrigerant is reduced without making the motor-operated valve fully closed, and suppressing generation of operation noise due to on / off Can. In addition, the motor-operated valve having the configuration as described above has an advantage that it is possible to reliably prevent the sticking of the valve body to the valve seat portion as compared with a normal valve-closing type motor-operated valve.

Patent No. 5164579 gazette

  By the way, in the conventional valve-less type motor-operated valve as described above, the rotor connected and fixed to the valve shaft is finally rotated in the valve-closing direction until the slider is set to the home position, A gap of the predetermined size is formed between the valve seat portion and the valve seat portion. Therefore, the dimensional accuracy of the gap between the valve body and the valve seat portion at the origin position depends on the component accuracy of the component having a complicated shape such as the valve body and the valve seat portion of the valve main body. There is a possibility that the dimensional variation of

  The present invention has been made in view of the above problems, and the object of the present invention is, with a simple configuration, the dimensional variation of the gap formed between the valve body and the valve seat portion at the origin position. It is providing the motor-operated valve which can be restrained, and its assembling method.

In order to solve the problems described above, the motor-operated valve according to the present invention is inserted in a state in which the valve shaft provided with a valve body at the lower end and the valve shaft can be relatively moved and relatively rotated in the axial direction. A valve body having a cylindrical portion, a valve seat portion for contacting and separating the valve body, and a valve body to which the guide bush is attached and fixed; a cylindrical portion in which the valve shaft is inserted; A valve stem holder connected and fixed, a biasing member interposed between the valve stem and the valve stem holder for biasing the valve in the valve closing direction, the valve stem holder with the guide bush A motor having a rotor and a stator for rotating with respect to the guide bush, and the guide bush for moving up and down the valve body of the valve shaft relative to the valve seat portion of the valve body according to rotational driving of the rotor Cylinder and valve stem holder A screw feed mechanism provided between the cylindrical portion, a fixed stopper body provided on a lower stopper attached to the guide bush, and the valve shaft holder for restricting the rotational movement of the valve shaft holder; And a lower stopper mechanism including a movable stopper body provided, and the motor-operated valve having a gap formed between the valve body and the valve seat portion when the valve body is at the lowest position. And the seating state in which the valve body abuts on the valve seat portion when the guide bush is disposed at a predetermined position with respect to the valve body and the valve shaft holder is at the lowermost position by the lower stopper mechanism And mounting and fixing the guide bush at the predetermined position to the valve main body at a position where the gap is increased in the axial direction with respect to the valve main body, the valve shaft holder by the lower stopper mechanism The dimensions and shape of each part are designed such that when in the lowermost position, the separated state in which the gap is formed between the valve body and the valve seat part can be obtained, the predetermined position is The guide bush and the valve body are axially separated from each other, and in the separated state, the guide bush is attached and fixed to the valve body at an interval equal to or larger than the gap in the axial direction. It is characterized by being done.

  In another preferred form, the guide bush is screwed on and fixed to the valve body.

  In another preferable aspect, the screw feeding mechanism includes a fixed screw portion formed on the outer periphery of the cylindrical portion of the guide bush and a movable screw portion formed on the inner periphery of the cylindrical portion of the valve shaft holder. The lower stopper is screwed on and fixed to the fixing screw portion of the guide bush.

A method of assembling a motor-operated valve according to the present invention includes a valve shaft having a valve body at its lower end, and a guide bush having a cylindrical portion into which the valve shaft is inserted in a relatively movable and relatively rotatable state in the axial direction. And a valve body having a valve seat portion to which the valve body contacts and separates, and a cylindrical portion into which the valve shaft is inserted, and a valve shaft connected and fixed to the valve shaft. A holder, an urging member interposed between the valve shaft and the valve shaft holder for urging the valve body in the valve closing direction, and for rotating the valve shaft holder with respect to the guide bush A motor having a rotor and a stator, and the cylindrical portion of the guide bush and the valve for moving up and down the valve body of the valve shaft with respect to the valve seat portion of the valve body according to rotational driving of the rotor Provided between the shaft holder and the cylindrical part A screw feed mechanism, a fixed stopper body provided on a lower stopper attached to the guide bush, and a movable stopper body provided on the valve shaft holder in order to restrict the rotational movement of the valve shaft holder. An assembly method of a motor-operated valve, wherein a gap is formed between the valve body and the valve seat portion when the valve body is in the lowermost position. When the guide bush is disposed at a predetermined position with respect to the valve main body in a state where the shaft and the valve shaft holder are not connected and fixed, when the valve shaft holder is at the lowermost position by the lower stopper mechanism The step of bringing the valve body into contact with the valve seat portion, the step of coupling and fixing the valve shaft and the valve shaft holder, and the guide bush in the predetermined position in the axial direction with respect to the valve body Dimension of the gap Look including a step of simply attached and fixed to the valve body at an elevated position, the predetermined position is characterized in that said valve body and said guide bush is a position away in the axial direction.

  In another preferable mode, in the step of attaching and fixing the guide bush to the valve body, the guide bush is rotated with respect to the valve body by a screw feed provided between the guide bush and the valve body. Raise it.

  According to the present invention, the guide bush is attached and fixed to the valve body at a distance equal to or larger than the size of the gap formed between the valve body and the valve seat when the valve body is in the fully lowered position. More specifically, after the guide bush in a predetermined position with respect to the valve body is raised by the dimension of the gap in the axial direction with respect to the valve body, the valve is mounted and fixed to the valve body. The lowest position of the body, in other words, the gap between the valve body and the valve seat when the valve body is in the lowest position is defined. That is, since the dimensional accuracy of the gap between the valve body and the valve seat portion at the home position basically depends on the dimensional accuracy of the attachment portion between the valve body and the guide bush, for example, the valve body and the valve body As compared with the conventional motor-operated valve whose dimensional accuracy of the gap is determined by the component accuracy of the component having a complicated shape such as the valve seat portion, dimensional dispersion of the gap can be suppressed, thereby fluid in a low flow rate region (Refrigerant) Controllability of the flow rate can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows 1st Embodiment of the motor operated valve which concerns on this invention. FIG. 7 is a view provided for explaining a process for bringing out the origin position (the most lowered position) of the valve body in the assembly process of the motor-operated valve shown in FIG. 1; (A) is a longitudinal sectional view showing a sitting state; The longitudinal cross-sectional view which shows a separation state. The figure which shows the flow characteristic of the motor-operated valve shown by FIG. The longitudinal cross-sectional view which shows 2nd Embodiment of the motor operated valve which concerns on this invention. FIG. 7 is a view provided for explaining a process of bringing out the origin position (the most lowered position) of the valve body in the assembly process of the motor-operated valve shown in FIG. 4, (A) is a longitudinal sectional view showing a sitting state, (B) is The longitudinal cross-sectional view which shows a separation state. The principal part enlarged longitudinal cross-sectional view which shows the principal part of the other example of the motor-operated valve shown by FIG.

  Hereinafter, embodiments of a motor-operated valve according to 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 FIG. 4 and does not indicate the position and direction in the actual use state.

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

  The motor-operated valve 1 of the illustrated embodiment mainly includes a valve shaft 10, a guide bush 20, a valve shaft holder 30, a valve body 40, a can 55, and a stepping motor 50 including a rotor 51 and a stator 52; A compression coil spring (biasing member) 60, a retaining member 70, a screw feed mechanism 28, and a lower stopper mechanism 29 are provided.

  The valve stem 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 the lower end portion of the lower small diameter portion 13 has a stepped inverted conical valve body 14 Are integrally formed.

  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. On the outer periphery 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 portion 46a of the valve main body 40 A fixing screw portion (male screw portion) 23 is formed. Further, the lower portion of the cylindrical portion 21 (portion below the fixed screw portion 23) has a large diameter and is a fitting portion 27 to the fitting hole 44 (formed on the upper surface) of the valve main body 40 . A lower stopper 25 is screwed to the fixed screw portion 23 (in the lower side than the valve shaft holder 30) so as to abut on the upper surface 27 a of the fitting portion 27. The fixed stopper body 24 which constitutes one side of the lower stopper mechanism 29 for restricting the rotational downward movement of the valve shaft holder 30 is integrally protruded.

  The valve shaft holder 30 has a cylindrical portion 31 into which the guide bush 20 is inserted, and a ceiling portion 32 through which an insertion hole 32a through which the upper end portion of (the upper small diameter portion 11 of) the valve shaft 10 is inserted. Have. On the inner periphery of the cylindrical portion 31 of the valve shaft holder 30, a movable screw portion (female screw portion) 33 which is screwed with the fixed screw portion 23 of the guide bush 20 to constitute the screw feed mechanism 28 is formed. 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.

  Further, the upper small diameter of the valve shaft 10 is formed between the terraced surface formed between the upper small diameter portion 11 and the middle 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 valve shaft 10 and the valve shaft holder 30 are urged away from each other in the raising and lowering direction (direction of the axis O) so as to be extrapolated to the portion 11, in other words, the valve shaft 10 (valve body 14) is always downward A compression coil spring (biasing member) 60 which urges in the (valve closing direction) 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 inside, 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, and the valve chamber 40a (The intermediate large diameter portion 12 of the valve shaft 10 is relatively movable (slidable) in the direction of the axis O and is rotatable relative to the axis O in the ceiling portion of the valve hole 10 and the guide bush 20 The fitting hole 27 is formed by fitting and fixing the lower portion (fitting portion 27) of the valve chamber 40a, and the second conduit 42a is brazed to the vertically oriented second opening 42 provided at the lower portion of the valve chamber 40a. A valve port orifice 46 is formed on the bottom wall 45 between the valve chamber 40a and the second opening 42 and has a valve seat portion 46a which is in contact with and separated from the valve body 14 while being connected and fixed.

  A wedge-shaped plate 47 is fixed to the upper end portion of the valve main body 40 by caulking or the like, and a lower end portion of a cylindrical can 55 with a butt is butt-welded to a step portion provided on the outer periphery of the wedge-shaped plate It is done.

  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 portion) of the valve shaft holder 30, a protrusion 30a extending in the vertical direction (for example, at an angular interval of 120 degrees around the axis O) is protruded. Upward locking surfaces (not shown) for supporting the rotor 51 are formed on both sides.

  The longitudinal groove 51 d of the inner cylinder 51 a of the rotor 51 engages with the projection 30 a of the valve shaft holder 30, and the lower surface of the inner cylinder 51 a of the rotor 51 abuts on the locking surface of the valve shaft holder 30. The rotor 51 is supported and fixed in a state of being aligned with the valve shaft holder 30, and the valve shaft holder 30 is rotated together with the rotor 51 while supporting the rotor 51 in the can 55.

  The relative movement between the valve shaft holder 30 and the rotor 51 in the vertical direction is prevented on the upper side of the rotor 51 and the valve shaft holder 30 (in other words, the rotor 51 is pressed downward against the valve shaft holder 30) In order to connect the shaft 10 and the valve shaft holder 30, a push nut 71 is externally fitted and fixed to the upper end portion of (the upper small diameter portion 11 of) the valve shaft 10 by press fitting / welding or the like. And a rotor retaining member 72 formed of a disc-like member formed at the center with an insertion hole 72a formed in the center thereof through which the upper end portion of the valve shaft 10 is inserted. ing. That is, the rotor 51 is sandwiched between the valve shaft holder 30 urged upward by the urging force of the compression coil spring 60 and the rotor presser 72. The height (in the vertical direction) from the upper end of the valve shaft holder 30 to the locking surface is the same as the height (in the vertical direction) of the inner cylinder 51 a of the rotor 51. The upper surface of the rotor holder 72 abuts on the lower surface (flat surface) of the rotor presser 72.

  Further, in the push nut 71 fixed to the upper end portion of the valve shaft 10, the valve shaft holder 30 is moved upward too much with respect to the guide bush 20 at the time of operation, and the fixing screw portion 23 of the guide bush 20 and the valve In order to prevent the threaded engagement with the movable screw portion 33 of the shaft holder 30 from being disengaged, a return spring 75 composed of a coil spring for biasing the valve shaft holder 30 toward the guide bush 20 is provided.

  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 portion 46a and to ensure controllability in a low flow rate region. At a given time, a gap of a predetermined size (a gap with a dimension of H in the vertical direction) is formed between the valve body 14 and the valve seat portion 46 a, and the guide bush 20 is formed of the valve body 40. On the other hand, the gap corresponding to the dimension H of the gap is opened in the elevating direction (the direction of the axis O), in other words, the lower end surface of (the fitting portion 27 of) the guide bush 20 and the fitting hole 44 of the valve main body 40 It is attached and fixed so that the distance to the bottom surface becomes the dimension H of the gap.

  The assembling process of the motor-operated valve 1, in particular, the process of bringing out the home position (the most lowered position) of the valve body 14 will be described in detail with reference to FIG. The spring 60, the valve shaft holder 30, the rotor 51, the valve body 40 and the like are assembled. At this time, the guide bush 20 and the valve body 40 abut on each other in the direction of the axis O, that is, the lower end surface of (the fitting portion 27 of) the guide bush 20 and the bottom surface of the fitting hole 44 of the valve body 40 They are arranged so as to be in contact and capable of relative movement (sliding) in the vertical direction. Next, the valve body 14 provided at the lower end of the valve stem 10 abuts (seats) the valve seat portion 46a, and the compression coil spring 60 is slightly compressed, and the movable stopper 34 and the lower portion of the valve stem holder 30 The valve shaft holder 30, the rotor, the screw feed mechanism 28 consisting of the fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30 until the fixed stopper body 24 of the stopper 25 abuts. 51 and lower the valve stem 10 while rotating. Then, with the valve shaft holder 30 disposed at the lowermost position as described above, the rotor presser 72 is fitted to the upper end portion of the valve shaft 10 and the push nut 71 is externally fitted and fixed by press fitting, welding or the like (seating State, see FIG. 2 (A)).

  Next, from the above seating state, the valve shaft 10, the guide bush 20, the lower stopper 25, the compression coil spring 60, the valve shaft holder 30, the rotor 51, the retaining member 70 (push nut 71 and rotor press 72), etc. After the integral assembly is raised by a predetermined size H while sliding the fitting portion 27 of the guide bush 20 in the fitting hole 44 of the valve body 40, the guide bush 20 of the assembly is assembled into the valve body Fix relative movement impossible to 40 by welding, welding, bonding, caulking and so on. Thus, the valve body 14 provided at the lower end portion of the valve stem 10 is lifted with respect to the valve seat portion 46a provided in the valve main body 40, so that the movable stopper body 34 of the valve stem holder 30 and the lower stopper 25 are fixed. Even when the stopper body 24 abuts and the valve shaft holder 30 is at the lowest position, a gap of a predetermined size (a gap with a dimension H in the vertical direction) between the valve body 14 and the valve seat 46a (Separate state, see FIG. 2 (B)).

  In order to simplify the positioning of the guide bush 20 with respect to the valve body 40 in the seated state, the guide bush 20 and the valve body 40 are abutted in the direction of the axis O, that is, (the fitting portion 27 of) the guide bush 20 After bringing the lower end face into contact with the bottom of the fitting hole 44 of the valve main body 40, the assembly is raised relative to the valve main body 40 by a predetermined dimension H, and the guide bush 20 of the assembly is attached to the valve main body 40 Although the relative movement is fixed by welding, welding, adhesion, caulking, etc., the guide bush 20 and the valve body 40 need not necessarily be the axis O if the guide bush 20 can be positioned with respect to the valve body 40 in the seating state. It is not necessary to abut in the direction. That is, after the guide bush 20 and the valve main body 40 are arranged at positions separated in the direction of the axis O in the sitting state (at this time, the valve body 14 is brought into contact with the valve seat portion 46a as described above) The rotor presser 72 is fitted into the upper end of the valve stem 10, and the push nut 71 is externally fitted and fixed by press fitting, welding or the like to connect and secure the valve stem 10 and the valve stem holder 30. Alternatively, the guide bush 20 of the assembly may be fixed to the valve body 40 so as not to move relative to each other by welding, welding, bonding, caulking or the like by raising the guide by a predetermined dimension H. In this case, in the separated state described above, the guide bush 20 is attached and fixed to the valve body 40 at an interval larger than the dimension H of the gap in the direction of the axis O.

  Furthermore, in the illustrated embodiment, the assembly is described as being lifted from the above-mentioned sitting state while sliding the fitting portion 27 of the guide bush 20 in the fitting hole 44 of the valve main body 40, for example, A female screw is formed on the inner periphery of the fitting hole 44 of the valve body 40, and an male screw is formed on the outer periphery of the fitting portion 27 of the guide bush 20. The guide bush 20 is fitted in the fitting hole 44 of the valve body 40. The portion 27 may be screwed, and the assembly may be raised while being rotated relative to the valve main body 40 by screw feeding of the female screw portion and the male screw portion.

  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) 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 (valve closing required lift amount) is formed between the portion 46a, a predetermined amount of passing flow rate is secured (see FIG. 3).

  Thus, in the motor-operated valve 1 of the first embodiment, when the valve body 14 is at the lowermost position with respect to the valve body 40, the guide bush 20 is between the valve body 14 and the valve seat portion 46a. Specifically, the guide bush 20 is fixed to the valve main body 40 at a predetermined position (the axis O). And the seating state where the valve body 14 abuts on the valve seat portion 46a when the valve shaft holder 30 is at the lowermost position by the lower stopper mechanism 29, and the guide in the predetermined position If the bush 20 is attached and fixed to the valve body 40 at a position where it is raised by the dimension H of the gap in the direction of the axis O with respect to the valve body 40, the valve shaft holder 30 is at the lowermost position To As can take a spaced state where the gap is formed between the valve body 14 and the valve seat portion 46a, each unit is designed. Then, the guide bush 20 located at a predetermined position with respect to the valve main body 40 is raised by the dimension H of the gap in the direction of the axis O and then fixed to the valve main body 40 to fix the valve body 14 at the lowermost position. In other words, the gap between the valve body 14 and the valve seat portion 46a when the valve body 14 is at the lowest position is defined. That is, since the dimensional accuracy of the gap between the valve body 14 and the valve seat portion 46a at the home position basically depends on the dimensional accuracy of the attachment portion between the valve body 40 and the guide bush 20, the gap It is possible to suppress the dimensional variation of the fluid flow rate controllability of the fluid (refrigerant) in the low flow rate region.

Second Embodiment
FIG. 4 is a longitudinal sectional view showing a second embodiment of the motor-operated valve according to the present invention.

  In the motor-operated valve 1 according to the first embodiment, the guide bush 20 is attached and fixed to the valve main body 40 at an interval (a gap) corresponding to the dimension H of the gap in the direction of the axis O Although a gap corresponding to the dimension H of the gap is provided between the lower end surface of (the fitting portion 27 of) the bush 20 and the bottom surface of the fitting hole 44 of the valve main body 40, the electric motor of the second embodiment In the valve 2, a plate-like member 49 having a thickness corresponding to the dimension H of the gap is interposed between the guide bush 20 and the valve main body 40, and the other configuration is the motored valve 1 of the first embodiment. It is almost the same as Therefore, in the following, only the configuration related to the plate-like member 49 will be described in detail, and the same configuration as the motor-operated valve 1 shown in FIG. The operation of the motor-operated valve 2 of the second embodiment is the same as that of the motor-operated valve 1 of the first embodiment.

  In the motor-operated valve 2 of the present embodiment, in the separated state, the fitting hole 44 of the lower end surface of the (the fitting portion 27 of) the guide bush 20 and the valve body 40 is simplified in order to simplify the positioning of the guide bush 20 with respect to the valve body 40. A plate member 49 having a thickness corresponding to the dimension H of the gap, for example, an annular shape or a C shape in plan view, is interposed between it and the bottom surface of the plate.

  The assembling process of the motor-operated valve 2, in particular, the process of bringing out the home position (the most lowered position) of the valve body 14 will be described in detail with reference to FIG. The seat is taken through (see FIG. 5A). Next, from the seating state, an assembly including the valve shaft 10, the guide bush 20, the lower stopper 25, the compression coil spring 60, the valve shaft holder 30, the rotor 51, and the retaining member 70 is integrated into a valve body After removing it from 40, place the plate-like member 49 on the bottom surface of the fitting hole 44 of the valve body 40 (until the lower end surface of the fitting portion 27 of the guide bush 20 abuts on the top surface of the plate-like member 49 ) The assembly is again attached to the valve body 40 so that the fitting portion 27 of the guide bush 20 is inserted into the fitting hole 44 of the valve body 40, and the guide bush 20 of the assembly is attached to the valve body 40 Fix relative movement impossible by welding, welding, adhesion, caulking etc. Thus, the valve body 14 provided at the lower end portion of the valve stem 10 is lifted with respect to the valve seat portion 46a provided in the valve main body 40, so that the movable stopper body 34 of the valve stem holder 30 and the lower stopper 25 are fixed. Even when the stopper body 24 abuts and the valve shaft holder 30 is at the lowest position, a gap of a predetermined size (a gap with a dimension H in the vertical direction) between the valve body 14 and the valve seat 46a Are formed, and the same separated state as the first embodiment is formed (see FIG. 5B).

  In the illustrated embodiment, the plate-like member 49 is interposed between the lower end surface of (the fitting portion 27 of) the guide bush 20 and the bottom surface of the fitting hole 44 of the valve main body 40. As shown in FIG. 6, an outer extension 27 'is formed in a portion of the fitting portion 27 of the guide bush 20 exposed from the fitting hole 44 of the valve body 40, and the outer extension 27' and the valve body A plate-like member 49 'having a thickness corresponding to the dimension H of the gap may be interposed between the plate and the upper surface of the plate 40. In this case, it is not necessary to completely remove the assembly from the valve body 40 when forming the separated state from the seated state.

  As described above, in the motor-operated valve 2 of the second embodiment, the guide is provided by interposing the plate-like member 49 having a thickness corresponding to the dimension H of the gap between the guide bush 20 and the valve main body 40. Since the bush 20 can be precisely positioned with respect to the valve body 40, the dimensional variation of the gap can be suppressed more effectively.

  In the first and second embodiments, a guide as a screw feed mechanism 28 for moving the valve body 14 of the valve shaft 10 up and down with respect to the valve seat portion 46 a of the valve main body 40 according to the rotational drive of the rotor 51. Employs a fixed screw (male thread) 23 formed on the outer periphery of the cylindrical part 21 of the bush 20 and a movable screw (female thread) 33 formed on the inner periphery of the cylindrical part 31 of the valve shaft holder 30 However, as the screw feeding mechanism 28, for example, the cylindrical portion 21 of the guide bush 20 is externally inserted into the cylindrical portion 31 of the valve shaft holder 30, and an internal thread portion (fixed screw portion) is formed on the inner periphery of the cylindrical portion 21 of the guide bush 20 It is a matter of course that the male screw portion (movable screw portion) may be formed on the outer periphery of the cylindrical portion 31 of the valve shaft holder 30. In the first and second embodiments, the fixing screw portion 23 of the guide bush 20 is provided as the lower stopper 25 having the fixed stopper body 24 that constitutes the lower stopper mechanism 29 that regulates the downward movement of the valve shaft holder 30. Although the one having a female screw portion to be screwed is adopted, as the lower stopper 25, one fixed to the guide bush 20 by an appropriate means or one integrally provided on the guide bush 20 is adopted. Not to mention getting.

1, 2 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 27 fitting portion 28 screw feed mechanism 29 lower stopper mechanism 30 valve shaft holder 31 cylindrical portion 33 movable screw portion (female screw portion)
34 Movable stopper body 40 valve 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 orifice 46a valve seat portion 47 collar portion 49 plate Bar 50 stepping motor 51 rotor 52 stator 55 can 60 compression coil spring (biasing member)
70 Retaining retaining member 71 Push nut 72 Rotor press O axis

Claims (5)

A valve stem provided with a valve body at its lower end,
A guide bush having a cylindrical portion 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 seat portion to which the valve body contacts and separates, and to which the guide bush is attached and fixed;
A valve stem holder having a cylindrical portion into which the valve stem is inserted, and fixedly connected to the valve stem;
A biasing member interposed between the valve stem and the valve stem holder for biasing the valve disc in the valve closing direction;
A motor having a rotor and a stator for rotating the valve shaft holder relative to the guide bush;
Between the cylindrical portion of the guide bush and the cylindrical portion of the valve shaft holder for moving up and down the valve body of the valve shaft relative to the valve seat of the valve body according to the rotational drive of the rotor A screw feed mechanism provided,
A lower stopper mechanism comprising a fixed stopper body provided on a lower stopper attached to the guide bush and a movable stopper body provided on the valve shaft holder, in order to restrict the rotational downward movement of the valve shaft holder; Equipped with
A motor-operated valve in which a gap is formed between the valve body and the valve seat portion when the valve body is in the lowest position.
A seating state in which the valve body abuts against the valve seat portion when the guide bush is disposed at a predetermined position with respect to the valve body and the valve shaft holder is at the lowermost position by the lower stopper mechanism; When the guide bush located at the predetermined position is fixed to the valve main body at a position where the gap is increased in the axial direction with respect to the valve main body, the lower stopper mechanism lowers the valve shaft holder The dimensions and shape of each part are designed such that, when being in position, the gap can be formed between the valve body and the valve seat portion.
The predetermined position is a position in which the guide bush and the valve main body are separated in the axial direction, and in the separated state, the guide bush is axially separated from the valve main body by a distance larger than the dimension of the gap. A motorized valve characterized in that it is opened and fixed. The motor-operated valve according to claim 1 , wherein the guide bush is screwed and fixed to the valve body. The screw feed mechanism includes a fixed screw portion formed on the outer periphery of the cylindrical portion of the guide bush and a movable screw portion formed on the inner periphery of the cylindrical portion of the valve shaft holder, and the lower stopper is the guide The motor-operated valve according to claim 1 or 2 , wherein the motor-operated valve is screwed and fixed to the fixing screw portion of the bush. A valve stem provided with a valve body at its lower end,
A guide bush having a cylindrical portion 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 seat portion to which the valve body contacts and separates, and to which the guide bush is attached and fixed;
A valve stem holder having a cylindrical portion into which the valve stem is inserted, and fixedly connected to the valve stem;
A biasing member interposed between the valve stem and the valve stem holder for biasing the valve disc in the valve closing direction;
A motor having a rotor and a stator for rotating the valve shaft holder relative to the guide bush;
Between the cylindrical portion of the guide bush and the cylindrical portion of the valve shaft holder for moving up and down the valve body of the valve shaft relative to the valve seat of the valve body according to the rotational drive of the rotor A screw feed mechanism provided,
A lower stopper mechanism comprising a fixed stopper body provided on a lower stopper attached to the guide bush and a movable stopper body provided on the valve shaft holder, in order to restrict the rotational downward movement of the valve shaft holder; Equipped with
A method of assembling a motor-operated valve, wherein a gap is formed between the valve body and the valve seat portion when the valve body is in the lowest position.
With the valve stem and the valve stem holder not connected and fixed, the guide bush is disposed at a predetermined position with respect to the valve body, and the valve stem holder is at the lowermost position by the lower stopper mechanism. Contacting the valve body with the valve seat portion;
Connecting and fixing the valve shaft and the valve shaft holder;
Wherein the guide bush only contains a step of attaching and fixing the valve body in a position raised in the axial direction by the dimension of the gap with respect to said valve body at a predetermined position,
The method of assembling a motor-operated valve according to claim 1, wherein the predetermined position is a position where the guide bush and the valve body are separated in the axial direction . In the step of attaching and fixing the guide bush to the valve body, the guide bush is raised while being rotated with respect to the valve body by a screw feed provided between the guide bush and the valve body. The assembling method of the motor operated valve according to claim 4 .

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