JP6412443B2 - Motorized valve - Google Patents

Description

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

  As this type of electric valve, for example, a valve body and a valve body having a valve hole formed in the valve chamber, a valve body that opens and closes the valve hole, a can that protrudes from the valve body, and an outside of the can A stator coil disposed inside the can, a rotor that is rotated by energization excitation of the stator coil, a screw tube fixed to the valve body, and a rotor that is rotatable with the rotor. A valve shaft holder that opens and closes the valve hole by the valve body via the valve shaft, and is interposed between the valve shaft holder and the valve shaft through the valve shaft, A valve closing spring for urging the valve body in a closing direction of the valve hole; and in cooperation with the valve closing spring, the valve shaft holder and the rotor in a direction in which the valve body opens and closes the valve hole. Known to have a stopper to prevent relative movement That (for example, see Patent Document 1).

  In the electric valve as described above, the valve shaft holder has a plurality of protrusions extending in the direction in which the valve body opens and closes the valve hole on the outer surface, and the rotor is on the inner surface, A plurality of grooves engaging with the plurality of protrusions, and the plurality of grooves and the plurality of protrusions are engaged; or the valve stem holder opens and closes the valve hole. A cross section 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 portion and the D cut portion are engaged with each other. The valve shaft holder is rotated together with the rotor.

JP 2011-208716 A

  By the way, in the conventional motor-operated 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, The D cut portion is engaged with the D cut portion. Further, in order to precisely rotate the valve shaft holder together with the rotor, the plurality of protrusions are extended to the upper end of the outer peripheral surface on the assembly start side to the rotor. Therefore, when the valve shaft holder is inserted into the rotor and the plurality of protrusions are engaged with the plurality of grooves, the center axis of the valve shaft holder and the rotor and the angular position around the center axis are accurately determined in advance. There was a problem that it was necessary to match and assembly was difficult.

  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 be easily assembled.

  In order to solve the above-described problems, a motor-operated valve according to the present invention is inserted in a state in which a valve shaft having a valve body at a lower end portion and the valve shaft is relatively movable and relatively rotatable in the axial direction. A guide bushing having a cylindrical part; a valve body having a valve seat part to which the valve body contacts and separates; and a guide body to which the guide bushing is attached and fixed; a can joined to the valve body; an inner side of the can and the guide A rotor disposed outside the bush, a stator disposed outside the can for rotationally driving the rotor, a cylindrical portion into which the guide bush is inserted, and an insertion through which the upper end portion of the valve shaft is inserted A valve shaft holder that is coupled to the valve shaft and is rotated integrally with the rotor while supporting the rotor in the can, and formed on the outer periphery of the guide bush. The The valve body of the valve shaft connected to the valve shaft holder in response to the rotational drive of the rotor is configured to include the fixed screw portion and a movable screw portion formed on the inner periphery of the valve shaft holder. And a screw feed mechanism for moving up and down with respect to the portion. A flat surface is continuously provided, and a ridge that protrudes downward from a position below the upper end edge of the flat surface extends in the up-down direction, and the inner surface of the rotor includes the flat surface and The valve shaft holder is provided with a receiving surface comprising a complementary plane and a vertical groove into which the protrusion is fitted, and the flat surface, the receiving surface, and the protrusion and the vertical groove engage with each other. Is rotated with the rotor, To have.

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

  In another preferred embodiment, the rotor has a double tube configuration including an inner cylinder and an outer cylinder, and the receiving surface and the longitudinal groove are provided on the inner periphery of the inner cylinder.

  In a more preferred form, the vertical height of the inner cylinder is smaller than the vertical height of the outer cylinder, and the inner cylinder is accommodated inside the outer cylinder.

  According to the motor-operated valve of the present invention, when the valve shaft holder and the rotor are assembled, first, a 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, the flat surface of the valve shaft holder and the receiving surface of the rotor are engaged, and the central axis of the valve shaft holder and the rotor and the angle around the central axis The position is roughly aligned. For this reason, when the valve shaft holder is further inserted into the rotor and the protrusion protruding from the flat surface is inserted into the rotor, the protrusion of the valve shaft holder and the vertical groove of the rotor are smoothly engaged. As a result, the valve shaft holder and the rotor can be easily assembled.

  Further, by providing a taper portion that becomes narrower as it goes upward at the upper end portion of the ridge, the ridge of the valve shaft holder and the vertical groove of the rotor can be more smoothly engaged.

The longitudinal cross-sectional view which shows one Embodiment of the motor operated valve which concerns on this invention. It is a figure which shows the rotor of the motor operated valve shown by FIG. 1, (A) is a top view, (B) is AA arrow sectional drawing of (A). It is a figure which shows the valve stem holder of the motor operated valve shown by FIG. 1, (A) is a perspective view, (B) is a front view, (C) is a left view, (D) is a right view, (E) Is a top view, (F) is a bottom view, and (G) is a cross-sectional view taken along line BB in (D). FIG. 2 is a diagram for explaining a process of assembling a rotor and a valve shaft holder in the motor-driven valve assembly process shown in FIG. 1, and (A) is just before the valve shaft holder is inserted into the inner cylinder of the rotor. The longitudinal cross-sectional view which shows the state of this, and CC sectional drawing of the longitudinal cross-sectional view, (B) is the longitudinal cross-sectional view which shows the state in which the taper surface part of the valve-shaft holder was inserted in the inner cylinder of a rotor, and its longitudinal cross-section CC sectional drawing of a surface view, (C) is a longitudinal cross-sectional view which shows the state by which the flat surface part of the valve-shaft holder was inserted in the inner cylinder of a rotor, and CC arrow sectional drawing of the longitudinal cross-sectional view (D) is the longitudinal cross-sectional view which shows the state by which the protrusion of the valve-shaft holder was inserted in the inner cylinder of a rotor, and CC sectional view taken on the line of the longitudinal cross-sectional view. It is a figure which shows the rotor holding | suppressing with a positioning part of the motor operated valve shown by FIG. 1, (A) is a top view, (B) is DD sectional view taken on the line of (A). In the assembly process of the motor-operated valve shown in FIG. 1, it is a figure used for description of the origin position (the lowest lowered position) of the valve body, (A) is a top view and a longitudinal sectional view showing a seating state, B is a top view and a longitudinal sectional view showing a separated state. The figure which shows the flow volume characteristic 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 drawing, gaps formed between members, separation distances between members, etc. may be exaggerated for easy understanding of the invention and for convenience of drawing. is there. Further, in this specification, descriptions representing positions and directions such as up and down and left and right are based on the directional arrow display of FIG. 1 and do not indicate positions and directions in the actual use state.

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

  The motor-driven valve 1 of the illustrated embodiment mainly includes a stepping motor 50 including a valve shaft 10, a guide bush 20, a valve shaft holder 30, a valve body 40, a can 55, a rotor 51 and a stator 52, A compression coil spring (biasing member) 60, a retaining stopper 70, a screw feed 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 above, and a stepped inverted conical valve body 14 at the lower end portion of the lower small-diameter portion 13. Are integrally formed.

  The guide bush 20 includes a cylindrical portion 21 that is inserted in a state in which the valve shaft 10 (the intermediate large-diameter portion 12) is relatively movable (slidable) in the direction of the axis O and is relatively rotatable about the axis O, and The cylinder portion 21 extends upward from the upper end portion, has an inner diameter larger than that of the cylinder portion 21, and is inserted into 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. And an installation part 22. On the outer periphery of the cylindrical portion 21 of the guide bush 20, one of the screw feeding mechanisms 28 that raises and lowers the valve body 14 of the valve shaft 10 with respect to the valve seat portion 46 a of the valve main body 40 according to the rotational drive of the rotor 51. A fixed screw portion (male screw portion) 23 is formed, and a fixed stopper body 24 that constitutes one of the lower stopper mechanisms 29 for restricting the downward movement of the valve shaft holder 30 is formed at the lower end of the fixed screw portion 23. 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 the upper end portion of the valve shaft 10 (the upper small diameter portion 11 thereof) 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 that is screwed with the fixed screw portion 23 of the guide bush 20 and constitutes the screw feeding mechanism 28 is formed. A movable stopper body 34 constituting the other of the lower stopper mechanism 29 is integrally projected 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 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 upper small diameter of the valve shaft 10 is provided. The valve shaft 10 and the valve shaft holder 30 are energized in a direction away from each other in the ascending / descending direction (axis O direction) so as to be extrapolated to the portion 11, in other words, the valve shaft 10 is always downward (valve closing direction). A compression coil spring (biasing member) 60 that urges the coil spring is deflated.

  The said valve main body 40 is comprised from metal cylinders, such as brass and SUS, for example. The valve body 40 has a valve chamber 40a inside, and a first conduit 41a is connected and fixed to a lateral first opening 41 provided on a side portion of the valve chamber 40a by brazing or the like. The guide bush 20 and the insertion hole 43 through which the valve shaft 10 (the intermediate large-diameter portion 12) is inserted in a state 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 about the axis O. A fitting hole 44 to which the lower end portion of (cylindrical portion 21) is fitted and fixed is formed, and the second conduit 42a is inserted into the vertical second opening 42 provided in the lower portion of the valve chamber 40a. A valve orifice 46 having a valve seat portion 46a with which the valve body 14 contacts and separates is formed on the bottom wall 45 between the valve chamber 40a and the second opening 42. .

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

  A rotor 51 is rotatably disposed inside the can 55 and outside the guide bush 20 and the valve shaft holder 30. A yoke 52a, A stator 52 including a bobbin 52b, a stator coil 52c, a resin mold cover 52d, and the like 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 these lead terminals 52e via a substrate 52f, and are arranged in the can 55 by energization excitation to the stator coil 52c. The existing rotor 51 rotates about 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 together with the rotor 51 (integrally).

  Specifically, the rotor 51 is a double pipe comprising an inner cylinder 51a, an outer cylinder 51b, and a connecting portion 51c that connects the inner cylinder 51a and the outer cylinder 51b, as can be understood with reference to FIG. The height of the inner cylinder 51a in the vertical direction is smaller than the height of the outer cylinder 51b in the vertical direction, and the inner cylinder 51a is accommodated inside the outer cylinder 51b. Further, a receiving surface (D cut surface) 51d formed of a plane (at an angular interval of 120 degrees around the axis O) is formed on the inner periphery of the inner cylinder 51a, and the center of the receiving surface 51d is formed along the vertical direction. 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 angular interval of 120 degrees around the axis O).

  On the other hand, the outer periphery of the valve shaft holder 30 is provided with a tapered surface 30a formed of a truncated cone surface at the upper end thereof, as can be understood with reference to FIG. 3 (at an angular interval of 120 degrees around the axis O). ) A flat surface (D-cut surface formed by cutting a part of the outer periphery of the valve shaft holder 30) 30b is provided continuously from the tapered surface 30a, and more than the upper end edge of the flat surface 30b. A ridge 30c extending in the vertical direction downward from the lower position is projected, and a quadrangular frustum-shaped taper portion 30d that becomes thinner as it goes upward is provided at the upper end of the ridge 30c. . Here, the flat surface 30 b of the valve shaft holder 30 has a shape complementary to the receiving surface 51 d of the rotor 51, and the protrusion 30 c of the valve shaft holder 30 is fitted into the vertical groove 51 e of the rotor 51. It has a shape. Further, the flat surface 30b (and the protrusion 30c formed in the center of the flat surface 30b along the vertical direction) extends to the middle part of the valve shaft holder 30, and at the lower end of the flat surface 30b. A locking surface 30e for supporting the rotor 51 is formed on both sides of the lower portion of the protrusion 30c.

  The step 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 51a of the rotor 51 through the lower opening of the outer cylinder 51b 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). Next, a portion (flat surface portion) including the flat surface 30b continuously provided on 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 The receiving surface 51d of the rotor 51 is engaged, so that 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 protrusion 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 protrusion 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 precise. To be aligned. 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 come into contact with each other, and the rotor 51 is supported and fixed by the valve shaft holder 30. .

  Thus, the locking surface 30e of the valve shaft holder 30 and the lower surface of the rotor 51 abut, the flat surface 30b of the valve shaft holder 30, the receiving surface 51d of the rotor 51, the protrusion 30c of the valve shaft holder 30, and the rotor 51. When the vertical groove 51 e is engaged, 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, relative movement of the valve shaft holder 30 and the rotor 51 in the ascending / descending direction is prevented on the upper side of the rotor 51 and the valve shaft holder 30 (in other words, the rotor 51 with respect to the valve shaft holder 30). Push nut (fixing member) that is externally fitted and fixed to the upper end portion of the valve shaft 10 (the upper small-diameter portion 11 thereof) by press-fitting, welding, or the like to connect the valve shaft 10 and the valve shaft holder 30 together. ) 71 and a rotor retaining member 70 composed of a flat plate-like member interposed between the push nut 71 and the rotor 51 are disposed. That is, the rotor 51 is sandwiched between the valve shaft holder 30 biased upward by the biasing force of the compression coil spring 60 and the rotor presser 72. The height (vertical direction) from the upper end of the valve shaft holder 30 to the locking surface 30e is the same as the height (vertical direction) of the inner cylinder 51a of the rotor 51, and the ceiling of the valve shaft holder 30 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 on the rotor presser 72 (the upper left half portion thereof), as can be understood with reference to FIG. An elongated hole 74 through which the upper end portion of the valve shaft 10 is slidably inserted in the lateral direction so as to cross the step formed by the positioning portion 73 (a step having a height H) is formed in the rotor retainer 72 with the positioning portion 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. Thus, when the valve body 14 is at the lowest lowered position (origin position), the valve body 14 and the valve seat portion 46a are spaced by the thickness H of the positioning portion 73. A gap is formed.

  The origin position (lowermost position) of the valve body 14 by the rotor presser 72 with the positioning portion 73 will be described in detail with reference to FIG. 6. First, the valve shaft 10, the guide bush 20, the compression coil spring 60, the valve shaft. With the holder 30, the rotor 51, the fixed stopper body 24, the valve main body 40, and the like assembled, the screw feeding mechanism 28 including the fixed screw portion 23 of the guide bush 20 and the movable screw portion 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. The valve body 14 provided at the lower end portion of the valve shaft 10 contacts (sits) the valve seat portion 46a, the compression coil spring 60 is slightly compressed, and the movable stopper body 34 and the guide of the valve shaft holder 30 are also compressed. In a state where the fixed stopper body 24 fixed to the bush 20 comes into contact with the valve shaft holder 30 at the lowest position, the rotor presser 72 is fitted to the upper end portion of the valve shaft 10 and the push nut 71 is installed. Fix by external fitting by press-fitting or welding. At this time, the push nut 71 is fixed in a state where it is placed on a portion other than the positioning portion 73 of the rotor presser 72 (sitting state, see FIG. 6A).

  Next, with the valve shaft holder 30 in the lowest position, the valve shaft 10 is lifted against the urging force of the compression coil spring 60 and positioned with the upper end of the valve shaft 10 inserted through the elongated hole 74. When the rotor presser 72 with the portion 73 is slid in the lateral direction (rightward in the figure), the positioning portion 73 is interposed between the rotor presser 72 and the push nut 71, and the lifting force on the valve shaft 10 is released, the push The nut 71 is disposed on the positioning portion 73 of the rotor retainer 72, and the valve shaft 10 is lifted with respect to the valve main body 40 by the thickness H of the positioning portion 73, whereby the valve body 14 and the valve seat portion. A gap corresponding to the thickness H of the positioning portion 73 (a gap having a dimension H in the ascending / descending direction) is formed between 46a and 46a (separated state, see FIG. 6B).

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

  Thereby, when the valve body 14 is at the lowest lowered position (origin position), a gap is formed between the valve body 14 and the valve seat portion 46a so that the dimension in the elevation direction corresponds to the thickness H of the positioning portion 73. Will be.

  Also, the push nut 71 fixed to the upper end portion of the valve shaft 10 moves the valve shaft holder 30 excessively upward relative 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 threaded engagement with the movable screw portion 33 of the shaft holder 30, a return spring 75 made of a coil spring that biases the valve shaft holder 30 toward the guide bush 20 is provided.

  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), 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 with the valve body 14 by the screw feeding 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, thereby the valve body 14. And the valve seat part 46a are 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 fixed to the guide bush 20 are in contact with each other and the valve body 14 is in the lowest lowered position, the valve body 14 and the valve seat portion 46a Since a gap (required lift amount when the valve is closed) is formed between them, a predetermined amount of passage flow rate is secured (see FIG. 7).

  As described above, in the motor-operated valve 1 of the present embodiment, when the valve shaft holder 30 and the rotor 51 are assembled, first, a portion including the tapered surface 30 a provided at the upper end of the valve shaft holder 30 is the inner portion of the rotor 51. The portion including the flat surface 30b inserted into the cylinder 51a and then connected to the tapered surface 30a is inserted into the inner cylinder 51a of the rotor 51, and the flat surface 30b of the valve shaft holder 30 and the receiver of the rotor 51 are received. The surface 51d is engaged, and the central axis of the valve shaft holder 30 and the rotor 51 is approximately aligned with the angular position around the central axis. Therefore, when the valve shaft holder 30 is further inserted into the inner cylinder 51a of the rotor 51, and the protrusion 30c protruding from the flat surface 30b is inserted into the inner cylinder 51a of the rotor 51, the valve shaft holder 30 The protrusion 30c and the vertical groove 51e of the rotor 51 are smoothly engaged, and the valve shaft holder 30 and the rotor 51 can be easily assembled.

  Further, by providing the upper end portion of the ridge 30c with a tapered portion 30d that becomes thinner as it goes upward, 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 in the lowest lowered position (normally in a fully closed state). ), The valve-less type motor-operated valve in which a gap of a predetermined size is formed between the valve body 14 and the valve seat portion 46a has been described. However, the present invention is applied to other motor-operated valves. Of course, it can also be applied. That is, the present invention is, for example, a closed-type electric valve in which the valve body is in contact (sitting) with the valve seat portion and the flow of fluid is blocked when the valve body is in the lowest lowered position, The motor-operated valve is a type in which a predetermined amount of passage flow rate is secured through a communication hole provided in the valve body or a bleed groove provided in the valve seat portion while contacting (sitting) the valve seat portion. Applicable.

DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Valve stem 14 Valve body 20 Guide bush 21 Cylindrical part 23 Fixing screw part (male screw part)
24 fixed stopper body 28 screw feeding mechanism 29 lower stopper mechanism 30 valve shaft holder 30a taper surface 30b flat surface 30c protrusion 30d taper 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 orifice 46a valve seat portion 47 bowl-shaped plate 50 stepping Motor 51 Rotor 51a Inner cylinder 51b Outer cylinder 51d Receiving surface 51e Vertical groove 52 Stator 55 Can 60 Compression coil spring (biasing member)
70 Retaining stop member 71 Push nut (fixing member)
72 Rotor retainer 73 Positioning part 74 Slot O O Axis

Claims (4)

A valve stem provided with a valve body at its lower end,
A guide bush having a cylindrical portion inserted in a state in which the valve shaft is relatively movable and relatively rotatable in the axial direction;
A valve body having a valve seat part to which the valve body comes into contact with and separated from and attached to the guide bush; and
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;
The guide bush has a cylindrical part inserted therein and a ceiling part through which an upper end of the valve shaft is inserted, and is connected to the valve shaft to support the rotor in the can. A valve shaft holder rotated integrally with the rotor,
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 according to the rotational drive of the rotor A screw feed mechanism for raising and lowering the valve body with respect to the valve seat part,
A tapered surface having a truncated cone surface is provided at the upper end of the outer periphery of the valve shaft holder, a flat surface is continuously provided downward from the tapered surface, and a lower side than the upper edge of the flat surface. A ridge extending in the vertical direction from the position downward is projected,
The inner periphery of the rotor is provided with a receiving surface composed of a plane complementary to the flat surface and a vertical groove into which the protrusion is fitted,
The motor-operated valve characterized in that the valve shaft holder is rotated together with the rotor by engaging the flat surface, the receiving surface, the protrusion, and the longitudinal groove.   2. The motor-operated valve according to claim 1, wherein a taper portion that is tapered toward an upper portion is provided at an upper end portion of the ridge.   3. The rotor according to claim 1, wherein the rotor has a double pipe structure including an inner cylinder and an outer cylinder, and the receiving surface and the vertical groove are provided on an inner periphery of the inner cylinder. The motorized valve described.   4. The motor-operated valve according to claim 3, wherein a height of the inner cylinder in a vertical direction is smaller than a height of the outer cylinder in a vertical direction, and the inner cylinder is accommodated in the outer cylinder.

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