JP6667592B2 - Motorized valve - Google Patents

Description

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

  As this type of electric valve, for example, a valve body having a valve chamber and a valve hole formed in the valve chamber, a valve body for opening and closing the valve hole, a can projecting from the valve body, and an outside of the can A rotor disposed inside the can and rotated by energization of the stator coil; a screw tube fixed to the valve body; and a screw formed rotatably with the rotor. A valve shaft holder that opens and closes the valve hole by the valve body through a valve shaft by a screw feed action with a pipe, and is interposed between the valve shaft holder and the valve shaft, through the valve shaft. A valve closing spring that urges the valve body in the closing direction of the valve hole; and a valve closing spring that cooperates with the valve closing spring in a direction in which the valve body opens and closes the valve hole. It is known to have a stopper that prevents relative movement. That (for example, see Patent Document 1).

  In the electric valve as described above, the valve shaft holder has, on an outer surface, a plurality of protrusions extending in a direction in which the valve element opens and closes the valve hole, and the rotor has an inner surface, A plurality of grooves that engage with the plurality of protrusions, wherein the plurality of grooves and the plurality of protrusions engage, or the valve stem holder opens and closes the valve hole with the valve body; When the rotor has a D-cut portion having a D-shaped cross section when viewed from the direction, the rotor has a hole portion that engages with the D-cut portion, and the hole and the D-cut portion engage with each other. The valve shaft holder is rotated together with the rotor.

JP 2011-208716 A

  By the way, in the conventional electric valve as described above, the valve shaft holder is inserted into the rotor from the lower side of the rotor to engage the plurality of grooves and the plurality of protrusions, or The D cut portion is engaged. Further, in order to precisely rotate the valve stem holder together with the rotor, the plurality of ridges extend to the upper end of the outer peripheral surface on the assembly start side to the rotor. Therefore, when the valve stem holder is inserted into the rotor to engage the plurality of protrusions with the plurality of grooves, the center axis of the valve stem holder and the rotor and the angular position around the center axis are accurately determined in advance. There is a problem that it is necessary to match them and it is difficult to assemble them.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a motor-operated valve that can be easily assembled.

In order to solve the above-mentioned problem, a motor-operated valve according to the present invention is provided with a valve shaft provided with a valve body at a lower end portion, and the valve shaft is inserted so as to be relatively movable and relatively rotatable in an axial direction. A guide bush having a cylindrical portion, a valve body having a valve seat portion to which the valve body comes in contact with and separated from the valve body, and the guide bush being fixedly mounted; a can joined to the valve body; A rotor disposed outside the bush, a stator disposed outside the can to rotationally drive the rotor, an insertion through which a cylindrical portion into which the guide bush is inserted and an upper end of the valve shaft; A valve shaft holder having a ceiling portion with a hole penetrated therein, connected to the valve shaft, and integrally rotating with the rotor while supporting the rotor in the can; and formed on an outer periphery of the guide bush. Sa The valve seat of the valve shaft, comprising a fixed screw portion and a movable screw portion formed on the inner periphery of the valve shaft holder, connected to the valve shaft holder in accordance with the rotational driving of the rotor. A screw feed mechanism for raising and lowering the part, a vertical groove formed in an axial direction on the inner periphery of the rotor, and an outer periphery of the valve shaft holder, A tapered surface having an inclination to reduce the diameter toward the upper end side is provided, and a ridge extending vertically is fitted so as to fit into the vertical groove, and the vertical groove is engaged with the ridge. Thereby, the valve shaft holder is rotated together with the rotor, the rotor has a double-pipe configuration including an inner cylinder and an outer cylinder, and the vertical groove is provided on the inner periphery of the inner cylinder. The lower surface of the ridge has a locking surface for supporting the rotor. The axial dimension from the upper end of the valve stem holder to the locking surface is the same as the axial dimension of the inner cylinder of the rotor, and is fixed to the upper end of the valve stem. A fixing member, and a retaining locking member that is disposed between the fixing member and the valve shaft holder and that has a rotor retainer disposed on the upper end side of the inner cylinder of the rotor, is further provided . It is characterized by.

  In a preferred form, a tapered portion that becomes thinner as it goes upward is provided at the upper end of the ridge.

  In a further preferred embodiment, the vertical height of the inner cylinder is smaller than the vertical height of the outer cylinder, and the inner cylinder is housed inside the outer cylinder.

  According to the motor-operated valve of the present invention, when assembling the valve shaft holder and the rotor, first, the portion including the tapered surface provided at the upper end of the valve shaft holder is inserted into the rotor, and then connected to the tapered surface. The portion including the provided flat surface is inserted into the rotor, and the flat surface of the valve shaft holder and the receiving surface of the rotor are engaged with each other, and the center axis of the valve shaft holder and the rotor and the angle around the center axis are set. The position is roughly aligned. Therefore, when the valve stem holder is further inserted into the rotor and the ridge projecting from the flat surface is inserted into the rotor, the ridge of the valve stem holder and the vertical groove of the rotor smoothly engage. As a result, the valve shaft holder and the rotor can be easily assembled.

  In addition, since the tapered portion that becomes thinner as it goes upward is provided at the upper end of the ridge, the ridge of the valve shaft holder can be more smoothly engaged with the vertical groove of the rotor.

1 is a longitudinal sectional view showing an embodiment of a motor-operated valve according to the present invention. 2A and 2B are diagrams illustrating a rotor of the motor-operated valve illustrated in FIG. 1, wherein FIG. 2A is a top view, and FIG. 2A and 2B are views showing a valve shaft holder of the motor-operated valve shown in FIG. 1, wherein FIG. 1A is a perspective view, FIG. 1B is a front view, FIG. 1C is a left side view, FIG. Is a top view, (F) is a bottom view, and (G) is a cross-sectional view of FIG. FIG. 2A is a view for explaining a step of assembling a rotor and a valve shaft holder in an assembling step of the motor-operated valve shown in FIG. 1, wherein FIG. And a vertical sectional view showing a state in which the tapered surface portion of the valve shaft holder is inserted into the inner cylinder of the rotor, and a longitudinal section thereof. FIG. 3 is a vertical sectional view showing a state where the flat surface portion of the valve shaft holder is inserted into the inner cylinder of the rotor, and a vertical sectional view of the vertical sectional view taken along line CC. (D) is a longitudinal sectional view showing a state in which the protrusion of the valve shaft holder is inserted into the inner cylinder of the rotor, and a sectional view taken along the line CC of the longitudinal sectional view. It is a figure which shows the rotor holding | maintenance with a positioning part of the electric valve shown in FIG. 1, (A) is a top view, (B) is DD sectional drawing of (A). FIGS. 2A and 2B are views for explaining a process of setting an origin position (lowest position) of a valve element in an assembling process of the electric valve shown in FIG. 1, wherein FIG. B) is a top view and a vertical cross-sectional view showing a separated state. FIG. 2 is a diagram showing flow characteristics of the motor-operated valve shown in FIG. 1.

  Hereinafter, an embodiment of a motor-operated valve according to the present invention will be described with reference to the drawings. In each of the drawings, gaps formed between members, separation distances between members, and the like may be exaggerated for ease of understanding of the invention and for convenience of drawing. is there. Further, in this specification, descriptions indicating positions and directions such as up and down, left and right, etc. are based on the direction arrow display in FIG. 1 and do not indicate positions and directions in an actual use state.

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

  The motor-operated valve 1 according to 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, a stepping motor 50 including a rotor 51 and a stator 52, It includes a compression coil spring (biasing member) 60, a retaining member 70, a screw feed mechanism 28, and a lower stopper mechanism 29.

  The valve shaft 10 has, from the upper side, an upper small-diameter portion 11, an intermediate large-diameter portion 12, and a lower small-diameter portion 13, and a stepped inverted conical valve element 14 is provided at the lower end of the lower small-diameter portion 13. Are integrally formed.

  The guide bush 20 includes a cylindrical portion 21 in which the valve shaft 10 (the intermediate large-diameter portion 12) is relatively movable (slidable) 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 and has an inner diameter larger than that of the cylindrical portion 21, and the upper end of the intermediate large-diameter portion 12 of the valve shaft 10 and the lower end of the upper small-diameter portion 11 are inserted therein. And a setting part 22. On the outer periphery of the cylindrical portion 21 of the guide bush 20, one of a screw feed mechanism 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 body 40 in accordance with the rotational driving of the rotor 51 is provided. A fixed screw portion (male screw portion) 23 is formed, and a fixed stopper body 24 is provided at a lower end of the fixed screw portion 23 to constitute one of a lower stopper mechanism 29 for restricting the valve shaft holder 30 from rotating downward. Is screwed.

  The valve shaft holder 30 includes 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 an upper end portion of the valve shaft 10 (the upper small diameter portion 11) 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. A movable stopper 34, which constitutes the other of the lower stopper mechanism 29, is integrally provided at the lower end of the outer periphery of the cylindrical portion 31.

  Further, between the terrace 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 upper small diameter of the valve shaft 10 is provided. The valve shaft 10 and the valve shaft holder 30 are urged in a direction in which the valve shaft 10 and the valve shaft holder 30 are separated in the ascending and descending direction (the direction of the axis O) so as to be extrapolated to the part 11, in other words, the valve shaft 10 is always downward (in the valve closing direction) A compression coil spring (biasing member) 60 that biases the spring is compressed.

  The valve body 40 is formed of a metal cylinder such as brass or SUS. The valve body 40 has a valve chamber 40a therein, and a first conduit 41a is connected and fixed to a first lateral opening 41 provided on a side portion of the valve chamber 40a by brazing or the like. The insertion hole 43 and the guide bush 20 through which the valve shaft 10 (the intermediate large-diameter portion 12) is relatively movable (slidable) in the direction of the axis O and relatively rotatable around the axis O in the ceiling portion. A fitting hole 44 is formed in which the lower end of the (cylindrical portion 21) is fitted and fixedly mounted, and a second conduit 42a is inserted into a second vertical opening 42 provided below the valve chamber 40a. A valve port orifice 46 having a valve seat portion 46a with which the valve body 14 comes into contact with and separates from the bottom wall 45 between the valve chamber 40a and the second opening 42 is formed. .

  A flange plate 47 is fixed to the upper end of the valve body 40 by caulking or the like, and the lower end of a cylindrical can 55 with a ceiling is butt-welded to a step provided on the outer periphery of the flange plate 47. Have been.

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

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

  In detail, the rotor 51 is a double pipe including an inner cylinder 51a, an outer cylinder 51b, and a connecting portion 51c connecting the inner cylinder 51a and the outer cylinder 51b, as can be understood well with reference to FIG. The vertical height of the inner cylinder 51a is smaller than the vertical height of the outer cylinder 51b, and the inner cylinder 51a is housed inside the outer cylinder 51b. In addition, a receiving surface (D-cut surface) 51d formed of a flat surface (at an angular interval of 120 degrees around the axis O) is formed on the inner circumference of the inner cylinder 51a, and is formed along the vertical direction at the center of the receiving surface 51d. A vertical groove 51e is provided. The connecting portion 51c is provided at the same position as the receiving surface 51d and the vertical groove 51e (at an angle of 120 degrees around the axis O).

  On the other hand, on the outer periphery of the valve shaft holder 30, a tapered surface 30a composed of a truncated cone surface is provided at the upper end thereof, as is well understood with reference to FIG. A flat surface (a D-cut surface formed by cutting a part of the outer periphery of the valve shaft holder 30) 30b is provided continuously downward from the tapered surface 30a, and is lower than the upper edge of the flat surface 30b. A protruding ridge 30c extending vertically downward from the lower position is provided in a protruding manner, and a truncated quadrangular pyramid-shaped tapered portion 30d that becomes thinner as it goes upward is provided at the upper end of the ridge 30c. . Here, the flat surface 30b of the valve shaft holder 30 has a shape complementary to the receiving surface 51d of the rotor 51, and the ridges 30c of the valve shaft holder 30 are fitted into the vertical grooves 51e of the rotor 51. It has a shape like The flat surface 30b (and a ridge 30c formed in the center of the flat surface 30b along the vertical direction) extends to the middle of the valve shaft holder 30, and the lower end of the flat surface 30b A locking surface 30e for supporting the rotor 51 is formed on both lower sides of the ridge 30c.

  The process of assembling the rotor 51 and the valve shaft holder 30 will be described in detail with reference to FIG. 4. The valve shaft holder 30 is attached to the inner cylinder 51 a of the rotor 51 via the lower opening of the outer cylinder 51 b of the rotor 51. When approaching (see FIG. 4A), first, a portion (tapered surface portion) including the tapered surface 30a provided at the upper end of the valve shaft holder 30 is inserted into the inner cylinder 51a (FIG. 4B). Then, a portion (flat surface portion) including the flat surface 30b connected to the tapered surface 30a is inserted into the inner cylinder 51a (see FIG. 4C), and the flat surface 30b of the valve shaft holder 30 is removed. The receiving surface 51d of the rotor 51 is engaged, and the center axis of the valve shaft holder 30 and the rotor 51 and the angular position around the center axis are approximately aligned. When the valve shaft holder 30 is further inserted into the inner cylinder 51a, the ridge 30c protruding from the flat surface 30b is inserted into the inner cylinder 51a from the tapered portion 30d provided at the upper end thereof (FIG. 4). (See (D)), the ridge 30c of the valve shaft holder 30 and the vertical groove 51e of the rotor 51 are engaged, and the center axis of the valve shaft holder 30 and the rotor 51 and the angular position around the center axis are precisely defined. Is aligned with When the valve shaft holder 30 is further inserted into the inner cylinder 51a, the locking surface 30e of the valve shaft holder 30 and the lower surface of the rotor 51 abut, and the rotor 51 is supported and fixed by the valve shaft holder 30. .

  As described above, the locking surface 30e of the valve shaft holder 30 and the lower surface of the rotor 51 come into contact with each other, and the flat surface 30b of the valve shaft holder 30, the receiving surface 51d of the rotor 51, the ridge 30c of the valve shaft holder 30, and the rotor 51 Is engaged with the vertical groove 51e, the valve shaft holder 30 is rotated together with the rotor 51 while supporting the rotor 51 in the can 55.

  As shown in FIG. 1, a relative movement between the valve shaft holder 30 and the rotor 51 in the elevating direction is prevented above the rotor 51 and the valve shaft holder 30 (in other words, the rotor 51 is moved relative to the valve shaft holder 30). Push nut (fixing member) that is externally fitted and fixed to the upper end of the valve shaft 10 (upper small-diameter portion 11) by press-fitting, welding, or the like in order to connect the valve shaft 10 and the valve shaft holder 30 together. ) 71 and a retaining member 70 composed of a flat plate-like member and a rotor retainer 72 interposed between the push nut 71 and the rotor 51. 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 retainer 72. The height (in the vertical direction) from the upper end of the valve shaft holder 30 to the locking surface 30e is the same as the height (in the vertical direction) of the inner cylinder 51a of the rotor 51, and the ceiling of the valve shaft holder 30 ( The upper surface of (32) is in contact with the lower surface (flat surface) of the rotor retainer 72.

  Further, in the present embodiment, a positioning portion 73 having a predetermined thickness H is integrally formed with the rotor retainer 72 (on the upper left portion of the upper surface) as shown in FIG. An elongated hole 74 into which the upper end of the valve shaft 10 is slidably inserted in the lateral direction so as to cross the step (a step having a height H) formed by the positioning part 73 is inserted into the rotor holder 72 having the positioning part 73. Is formed. As shown in FIG. 1, the rotor retainer 72 with the positioning portion 73 has a positioning portion 73 interposed between the rotor retainer 72 and the push nut 71. In other words, the push nut 71 is mounted on the positioning portion 73. When the valve body 14 is at the lowest position (origin position), the distance between the valve body 14 and the valve seat portion 46a is equal to the thickness H of the positioning portion 73. A gap is formed in

  Referring to FIG. 6, a detailed description will be given of the process of setting the origin position (lowest position) of the valve element 14 by the rotor retainer 72 with the positioning portion 73. First, the valve shaft 10, the guide bush 20, the compression coil spring 60, the valve shaft In a state where the holder 30, the rotor 51, the fixed stopper body 24, the valve body 40, and the like are assembled, the screw feed mechanism 28 including the fixed screw part 23 of the guide bush 20 and the movable screw part 33 of the valve shaft holder 30 is used. The valve shaft holder 30, the rotor 51 and the valve shaft 10 are lowered while rotating. Then, the valve body 14 provided at the lower end of the valve shaft 10 abuts (seizes) on the valve seat portion 46a, the compression coil spring 60 is slightly compressed, and the movable stopper body 34 of the valve shaft holder 30 and the guide. In a state where the fixed stopper body 24 fixed to the bush 20 abuts and the valve shaft holder 30 is disposed at the lowest position, the rotor retainer 72 is fitted into the upper end of the valve shaft 10 and the push nut 71 is attached. Externally fixed by press fitting, welding, etc. At this time, the push nut 71 is fixed while being placed on a portion other than the positioning portion 73 of the rotor retainer 72 (seated state, see FIG. 6A).

  Next, while the valve shaft holder 30 is kept at the lowest position, the valve shaft 10 is pulled up against the urging force of the compression coil spring 60, and the valve shaft 10 is positioned with the upper end of the valve shaft 10 inserted into the elongated hole 74. When the rotor presser 72 with the portion 73 is slid in the lateral direction (to the right in the drawing), the positioning portion 73 is interposed between the rotor presser 72 and the push nut 71, and when the lifting force on the valve shaft 10 is released, the pusher is pushed. The nut 71 is disposed on the positioning portion 73 of the rotor retainer 72, and the valve shaft 10 is pulled up with respect to the valve body 40 by the thickness H of the positioning portion 73, whereby the valve body 14 and the valve seat portion are A gap (a gap having a dimension H in the elevating direction) corresponding to the thickness H of the positioning portion 73 is formed between the gap 46a and the gap 46a (separated state, see FIG. 6B).

  Finally, (the lower end portion of) the push nut 71 and the positioning portion 73 of the rotor retainer 72 may be fixed by welding or the like.

  Accordingly, when the valve element 14 is at the lowest position (origin position), a gap is formed between the valve element 14 and the valve seat 46a, the dimension of which in the elevating direction corresponds to the thickness H of the positioning portion 73. Will be done.

  In addition, the push nut 71 fixed to the upper end of the valve shaft 10 has the valve shaft holder 30 which moves too much upward with respect to the guide bush 20 during operation, and the fixing screw portion 23 of the guide bush 20 and the valve. In order to prevent the screw engagement with the movable screw portion 33 of the shaft holder 30 from coming off, a return spring 75 composed of a coil spring for urging the valve shaft holder 30 toward the guide bush 20 is provided.

  In the electric valve 1 having such a configuration, when the rotor 51 is rotated by energizing 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 along with the valve element 14 by the screw feed mechanism 28 including the fixed screw part 23 of the guide bush 20 and the movable screw part 33 of the valve shaft holder 30. The gap (lift amount) between the valve seat 46a and the valve seat 46a is increased or decreased to adjust the flow rate of a fluid such as a refrigerant. Further, even when the movable stopper body 34 of the valve shaft holder 30 and the fixed stopper body 24 fixed to the guide bush 20 are in contact with each other, and the valve body 14 is at the lowest position, the valve body 14 and the valve seat portion 46a are in contact with each other. Since a gap (a required lift amount at the time of closing the valve) is formed therebetween, a predetermined amount of passing flow rate is secured (see FIG. 7).

  As described above, in the motor-operated valve 1 of the present embodiment, when assembling the valve shaft holder 30 and the rotor 51, first, the portion including the tapered surface 30 a provided at the upper end of the valve shaft holder 30 is formed inside the rotor 51. A portion including the flat surface 30b connected to the tapered surface 30a is inserted into the inner tube 51a of the rotor 51, and the flat surface 30b of the valve shaft holder 30 and the receiving portion of the rotor 51 are inserted. The surface 51d is engaged, and the center axis of the valve shaft holder 30 and the rotor 51 and the angular position around the center axis are approximately aligned. Therefore, when the valve shaft holder 30 is further inserted into the inner cylinder 51a of the rotor 51 and the ridge 30c protruding from the flat surface 30b is inserted into the inner cylinder 51a of the rotor 51, the valve shaft holder 30 The ridge 30c and the vertical groove 51e of the rotor 51 are smoothly engaged with each other, so that the valve shaft holder 30 and the rotor 51 can be easily assembled.

  Further, a tapered portion 30d that becomes thinner as it goes upward is provided at the upper end of the ridge 30c, so that the ridge 30c of the valve shaft holder 30 and the vertical groove 51e of the rotor 51 can be more smoothly engaged. it can.

  In the above-described embodiment, the movable stopper body 34 of the valve shaft holder 30 and the fixed stopper body 24 fixed to the guide bush 20 come into contact with each other, and the valve body 14 is at the lowest position (usually in a fully closed state). ), A valve-less type motor-operated valve in which a gap of a predetermined size is formed between the valve element 14 and the valve seat portion 46a has been described, but the present invention is applied to other motor-operated valves. Of course, it is also applicable. That is, the present invention provides, for example, a valve-closing type electric valve in which the valve element contacts (seizes) the valve seat portion when the valve element is at the lowest position to cut off the flow of fluid, The electric valve is of a type in which a predetermined flow rate is secured through a communication hole provided in the valve body or a bleed groove provided in the valve seat while contacting (seat) with the valve seat. Applicable.

Reference Signs List 1 electric valve 10 valve shaft 14 valve element 20 guide bush 21 cylindrical part 23 fixing screw part (male screw part)
24 Fixed stopper body 28 Screw feed mechanism 29 Lower stopper mechanism 30 Valve shaft holder 30a Tapered surface 30b Flat surface 30c Ridge 30d Tapered portion 30e Locking surface 31 Cylindrical portion 32 Ceiling 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 flanged plate 50 stepping Motor 51 Rotor 51a Inner tube 51b Outer tube 51d Receiving surface 51e Vertical groove 52 Stator 55 Can 60 Compression coil spring (biasing member)
70 retaining member 71 push nut (fixing member)
72 Rotor retainer 73 Positioning part 74 Slot O

Claims (3)

A valve shaft provided with a valve body at a lower end portion,
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 with which the valve body comes and goes and the guide bush is fixedly attached,
A can joined to the valve body,
A rotor disposed inside the can and outside the guide bush;
A stator disposed outside the can to rotationally drive the rotor;
A cylindrical portion into which the guide bush is inserted and a ceiling portion through which an insertion hole through which the upper end of the valve shaft is inserted are connected to the valve shaft to support the rotor in the can. A valve shaft holder rotated integrally with the rotor while
The valve shaft, comprising a fixed screw portion formed on the outer periphery of the guide bush and a movable screw portion formed on the inner periphery of the valve shaft holder, and connected to the valve shaft holder in accordance with the rotational driving of the rotor. A screw feed mechanism for raising and lowering the valve body with respect to the valve seat portion,
On the inner periphery of the rotor, a longitudinal groove formed in the axial direction is provided,
On the outer periphery of the valve stem holder, a tapered surface having an inclination of decreasing the diameter toward the upper end side is provided, and a ridge extending vertically so as to fit into the vertical groove is provided, and is provided.
By engaging the vertical groove and the ridge, the valve shaft holder is configured to rotate together with the rotor ,
The rotor has a double-pipe configuration including an inner cylinder and an outer cylinder, and the vertical groove is provided on an inner periphery of the inner cylinder,
A locking surface for supporting the rotor is formed at a lower portion of the ridge,
The axial dimension from the upper end of the valve stem holder to the locking surface is the same as the axial dimension of the inner cylinder of the rotor,
A retaining member fixed to an upper end side of the valve shaft, and a retainer disposed between the fixing member and the valve shaft holder and having a rotor retainer disposed at an upper end side of the inner cylinder of the rotor; An electric valve, further comprising a locking member .   The motor-operated valve according to claim 1, wherein a tapered portion that becomes thinner as it goes upward is provided at an upper end portion of the ridge. 3. The electric motor according to claim 1, wherein the vertical height of the inner cylinder is smaller than the vertical height of the outer cylinder, and the inner cylinder is housed inside the outer cylinder. 4. valve.

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