JP6434236B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor-operated valve suitable for use in a heat pump type air conditioning system and the like, and in particular, a can is hermetically joined to a valve main body, and a rotor is driven to rotate a rotor disposed on the inner periphery of the can. The present invention relates to a motor-operated valve that is externally fitted.

  As an electric valve, for example, as seen in Patent Document 1, etc., a valve body having a valve chamber, a valve seat (valve port), a valve shaft having a valve body portion, an inlet / outlet (conduit joint), etc., has a ceiling portion The cylindrical lower end of the cylindrical can is hermetically bonded, a rotor is disposed with a predetermined gap on the inner periphery of the can, and a stator is externally fitted to the can to rotationally drive the rotor It has been known.

  In such a motor-operated valve, a screw feed mechanism is provided between the rotor and the valve body portion to bring the valve body portion into and out of contact with the valve seat (valve port) using the rotation of the rotor. The flow rate is adjusted by changing the lift amount of the body part.

  A stepping motor is constituted by the rotor and the stator, and the stator has a two-phase stator coil, and each stator coil has a tapered claw-shaped magnetic pole tooth with a predetermined angular interval on the inner peripheral side. It consists of a pair of upper and lower yokes that are cut and raised so as to contact the outer periphery, a bobbin that is externally fitted to the magnetic pole teeth, a coil wound around this bobbin, etc., and each stator coil is stacked up and down, It is generally well known that the internal voids are coated and filled with resin by molding.

  In the motor-operated valve as described above, since the stator is molded, a minute gap is generated between the magnetic pole teeth and the can due to resin remaining on the can side of the magnetic pole teeth. is there. In addition, the magnetic pole teeth may not come into contact with the can for other reasons. If a noise of several kilovolts is applied to the stator coil in such a state, a discharge may occur between the magnetic pole teeth and the can, and if a discharge occurs, the associated noise adversely affects the peripheral circuits. May cause effects.

  In order to prevent the occurrence of such a problem, Patent Document 1 discloses that a metal detent member that is attached and fixed to the lower surface of the stator to prevent relative rotation between the valve body and the stator is positioned at the lowest side. It has been proposed to interpose an elastic body such as a coil spring having conductivity between the yoke and the yoke.

  In such a proposed electric valve, the valve main body and the can, and the valve main body and the rotation preventing member are electrically connected. Therefore, the yoke and the valve main body include a conductive elastic body such as a coil spring and a rotation preventing member. Electrically connected. Therefore, even if high-voltage noise is applied to the stator coil, the yoke and the can have the same potential, and it is possible to prevent discharge between the yoke and the can, thereby reducing adverse effects on the peripheral circuits. Can do.

  In addition, since the member that electrically connects the anti-rotation member and the yoke is a conductive elastic body such as a coil spring, even if there is a variation in the distance between the anti-rotation member and the yoke, the variation is coiled. Since it can be absorbed by expansion and contraction of a conductive elastic body such as a spring, there is an advantage that current can be reliably supplied between the anti-rotation member and the yoke.

JP-A-2005-90571

  However, in the motor-operated valve described in Patent Document 1, since a conductive elastic body such as a coil spring is interposed between the rotation preventing member and the yoke, the lowermost yoke in the molded stator It is necessary to form a fitting hole on the lower surface side of the motor, and a mounting hole or the like in the anti-rotation member. Therefore, it is necessary to modify the existing stator or the like. In order to modify an existing stator or the like, it is necessary to change the shape of an existing mold for molding, etc., and the manufacturing process is complicated, and production costs and product costs are increased.

  The present invention has been made in view of the above circumstances. The object of the present invention is not to modify an existing stator, a mold for molding, or the like between the yoke and the can. It is possible to reliably suppress the occurrence of a desired discharge, and even if high-voltage noise is applied to the stator coil, it is possible to reduce the adverse effects on the peripheral circuits and to keep the manufacturing cost and product cost low. It is to provide an electric valve.

In order to achieve the above object, the motor-operated valve according to the present invention basically has a valve chamber, a valve seat, a valve body, and an inlet / outlet, and a lower end portion of a cylindrical can with a ceiling portion is hermetically sealed. A stator molded to the can for externally driving a rotor disposed with a predetermined gap on the inner periphery of the can, and the stator and the valve body An anti-rotation member is attached and fixed to the lower surface side of the stator to prevent relative rotation, and the valve body is brought into contact with and separated from the valve seat by utilizing the rotation of the rotor. Has a yoke having an annular flat plate portion and a predetermined number of claw-shaped magnetic pole teeth cut and raised at a predetermined angular interval on the inner peripheral side of the annular flat plate portion, and a mold for each magnetic pole tooth Lower surface exposed part not covered with resin and said detent Between the member, is interposed is vertically elastically deformable annular conductive spring, it said conductive spring, have a shape substantially along an arc of a circle having the same inner diameter as the annular plate portion of the inner diameter of the yoke And the mountain-shaped bending part higher than the separation distance of the lower surface exposure part of the said magnetic pole tooth | gear and the said rotation prevention member is formed in the said conduction | electrical_connection spring in the natural state, It is characterized by the above-mentioned.

In a preferred embodiment, the mountain-shaped bent portions of the conduction spring are formed at a plurality of positions with an angular interval that is a multiple of the angular interval between the adjacent magnetic pole teeth.

  In another preferred embodiment, a cylindrical surface portion having an inner diameter substantially the same as the inner diameter of the annular flat plate portion of the yoke is formed on the lower surface side of the stator, and the conduction spring is disposed along the cylindrical surface portion.

  The anti-rotation member preferably has a plate-like part in which an opening through which the can can be inserted is formed, and a plurality of pressing parts for pressing the conduction spring against the yoke side are provided on the opening side of the plate-like part. Provided.

  In another preferred embodiment, the anti-rotation member has a plate-like portion having an opening through which the can can be inserted, and a plurality of inverted L-shaped plate portions are cut on the opening side of the plate-like portion. The horizontal side portion of the inverted L-shaped plate portion is a pressing portion for pressing the conduction spring against the yoke side, and the vertical side portion of the inverted L-shaped plate portion is the stator and the valve. The engaging portion is used to prevent relative rotation with the main body.

  In another preferred embodiment, at least a portion between one end portion of the conduction spring and the mountain-shaped bent portion and a portion between the other end portion of the conduction spring and the mountain-shaped bent portion are pressed. The position in the rotation direction of the conduction spring and the rotation preventing member is set so that the portion is pressed.

  In another preferred aspect, a rectangular convex portion made of a mold resin is provided on the lower surface side of the stator, which is located between the magnetic pole teeth in a plan view and protrudes downward from the lower surface of the magnetic pole teeth, A portion other than the mountain-shaped bent portion of the conduction spring is sandwiched between the rectangular convex portion and the pressing portion of the rotation preventing member.

  In another preferred embodiment, the distance between the lower surface of the square convex portion and the lower surface of the stator is made substantially the same as the diameter of the elastic wire constituting the conductive spring.

  In another preferred aspect, an engagement hole for preventing relative rotation between the stator and the valve body is formed in a vertical side portion of the inverted L-shaped plate portion of the rotation preventing member, and the can A protrusion that fits into the engagement hole is formed.

  In another preferred embodiment, the conduction spring is bent into a notch shape using a conductive elastic wire as a material.

  In the motor operated valve according to the present invention, the yoke and the anti-rotation member are electrically connected via the conduction spring, and the anti-rotation member, the can and the valve body are also electrically connected. Even if this noise is applied, since the yoke and the can have the same potential, it is possible to reliably prevent an undesirable discharge from occurring between the yoke and the can, and to reduce adverse effects on the peripheral circuits. .

  In addition, since the member that electrically connects the anti-rotation member and the yoke is a conductive spring having a dimensional shape that matches the structure of the existing stator, the existing stator or mold for molding must be modified. In addition, since the conductive spring is manufactured simply by bending an elastic metal wire that can be obtained at low cost into a specific shape, the manufacturing cost and the product cost can be kept low.

The partial notch front view which shows one Example of the motor operated valve which concerns on this invention. FIG. 2 is a schematic cross-sectional view showing a stator portion before being externally fitted to the can shown in FIG. 1. The partial notch perspective view which shows the yoke which is one of the components of the stator shown by FIG. 2 with a conduction spring. The bottom view of the stator (single item) shown by FIG. The bottom view of the stator part of the state (state which attached the rotation prevention member and the conduction spring) shown by FIG. An example of the conduction | electrical_connection spring used for one Example of this invention is shown, (A) is a top view, (B) is a front view, (C) is a perspective view of the state upside down.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a partially cutaway front view showing an embodiment of a motor-operated valve according to the present invention, FIG. 2 is a schematic cross-sectional view showing a stator portion before being externally fitted to the can shown in FIG. 1, and FIG. 2 is a partially cutaway perspective view showing a yoke as one of the constituent elements of the stator shown in FIG. 2 together with a conduction spring, FIG. 4 is a bottom view of the stator (single item) shown in FIG. 2, and FIG. 5 is shown in FIG. It is a bottom view of the stator part of a state (state which attached the rotation prevention member and the conduction spring).

  The illustrated motor-operated valve 1 has a valve chamber, a valve seat (valve port), a valve shaft having a valve body, inlet / outlet ports (conduit joints) 11, 12 and the like, as described in Patent Document 1 and the like. A lower end portion of a cylindrical can 20 with a ceiling portion is hermetically joined to the valve body 10 by welding or the like. Although the internal configuration of the can 20 and the valve body 10 is not shown, a rotor is disposed on the inner periphery of the can 20 with a predetermined gap, and a stator 50 is mounted on the can 20 to rotationally drive the rotor. It is fitted.

  In such a motor-operated valve 1, a screw feed mechanism is provided between the rotor and the valve body portion to bring the valve body portion into and out of contact with the valve seat (valve port) using the rotation of the rotor. The flow rate is adjusted by changing the lift amount of the valve body. The internal configuration of the can 20 and the valve main body 10 is the same as the conventional one and is irrelevant to the characteristic part of the present invention. See).

  The rotor and the stator 50 constitute a stepping motor. The stator 50 is molded and has two-phase (A-phase and B-phase) stator coils 50A and 50B. The upper-side stator coil 50 </ b> A includes yokes 51, 52 that are paired up and down, a bobbin 55 attached to the yokes 51, 52, a coil 57 wound around the bobbin 55, and the like. The lower stator coil 50B includes upper and lower yokes 53 and 54, a bobbin 56 attached to the yokes 53 and 54, a coil 58 wound around the bobbin 56, and the like.

  The yokes 51, 52, 53, and 54 are manufactured by sheet metal working, and the yoke 54 is an annular flat plate portion 54A, as shown in FIG. 3 as a representative example of the lower yoke 54 of the stator coil 50B. A predetermined number (here, 12) cut and raised at a predetermined angle interval (30 ° interval here) from the center of the annular flat plate portion 54A on the inner peripheral side of the outer cylindrical portion 54B and the annular flat plate portion 54A. ) Magnetic pole teeth 54C.

  The magnetic pole teeth 54C have an L-shaped cross section composed of a short horizontal side portion 54d protruding inward in the radial direction from the annular flat plate portion 54A and a tapered claw-shaped vertical side portion 54e bent vertically from the horizontal side portion 54d. The dimensions of the respective parts so that the vertical claw-shaped vertical side portion 54e (which may be referred to as magnetic pole teeth 54 for the sake of simplicity) are in contact with the outer peripheral surface of the can 20 are presented. Is set.

  The upper yoke 53 of the stator coil 50B has an annular flat plate portion 53A and magnetic pole teeth 53C similar to the lower yoke 54, but there is no outer cylindrical portion. When the stator coil 50B is manufactured, the bobbin 56 around which the coil 58 is wound is fitted around the magnetic pole teeth 54C of the lower yoke 54, and then the upper yoke 53 is directed downward with the magnetic pole teeth 53C downward. 53C is positioned so as to be inserted between the adjacent magnetic pole teeth 54C of the lower yoke 54, and the annular flat plate portion 53A is positioned above the outer cylindrical portion 54B of the lower yoke 54 (the stepped portion 54j formed in the upper portion). ) Is fixed by fitting.

  On the other hand, the upper-side stator coil 50A has a configuration in which the above-described lower-side stator coil 50B is turned upside down, and the upper yoke 51 includes an annular flat plate portion 51A, an outer cylindrical portion 51B, The lower yoke 52 includes an annular flat plate portion 52 </ b> A and a magnetic pole tooth 52 </ b> C similar to the yoke 53.

  The magnetic pole teeth 51C and 52C of the stator coil 50A stacked on the stator coil 50B are shifted from the magnetic pole teeth 53C and 54C of the stator coil 50B by a predetermined tooth pitch (here, 1/4 tooth pitch). . Further, in the outer cylindrical portions 51B and 54B, cutout openings 59 are formed for drawing out the connectors 71 and lead terminals 72 used for connection between the coils 57 and 58 and the outside to the outside of the stator coils 50A and 50B. .

  When molding a stator having the stator coils 50A and 50B having the above-described configuration, the stacked stator coils 50A and 50B are set in a mold for molding. The mold for molding covers, for example, a lower mold on which the stacked stator coils 50A and 50B are placed, a core for forming an insertion hole 61 into which the can 20 is inserted, and a lower mold. A lower mold and an upper mold that cooperates with the core to form a sealed space, and the lower mold includes a convex portion that receives the lateral side portion 54d of each magnetic pole tooth 54C in the lowermost yoke 54. Are provided at the same angular intervals as the magnetic pole teeth 54C.

  When the stator coils 50A and 50B are set in the mold having such a structure and the molten resin is injected into the mold, the outer and inner void portions of the stator coils 50A and 50B are formed as shown in FIG. Further, the mold resin 60 is coated and filled. Note that the left side portion of the stator 50 in FIG. 2 is a stepped cross section as indicated by the line of uu in FIG. 2 passing through the magnetic pole teeth 52C and 53C, and the right side portion of the stator 50 is FIG. 2 shows a stepped cross section through the magnetic pole teeth 51C and 54C as indicated by the arrows vv in FIG.

  In this case, between the magnetic pole teeth 51C, 52C, 53C, 54C and the rounded corners of each magnetic pole tooth 51C, 52C, 53C, 54C (the R portion (outer curved portion) from the horizontal side portion 54d to the vertical side portion 54e). In this case, the resin wraps around and is filled and filled, but at the time of molding, the outer peripheral side (base) of the rounded portion on the lower surface of the lateral side portion 54d of each magnetic pole tooth 54C received by the convex portion provided on the lower die Since the resin does not wrap around the (end side) portion, the portion is not covered with the resin and is exposed. The exposed portion of the lower surface of the magnetic pole teeth 54C is denoted by reference numeral S in FIGS.

  Further, a cylindrical surface portion 65 having substantially the same inner diameter as the inner diameter X of the annular flat plate portion 54A of the yoke 54 is formed on the lower surface 50b side of the stator 50 (mold resin 60), and between the magnetic pole teeth 54C in plan view. And the convex portions 63 that protrude downward from the lower surface of the magnetic pole teeth 54C are provided at the same angular intervals as the magnetic pole teeth 54C. The lower surface of the square convex portion 63 is located above the lower surface 50b of the stator 50 (mold resin 60) by a distance K.

  Further, a board 73 and a connector 74 for connecting the lead terminal 72 drawn out of the stator 50 and a plurality of lead wires 75 are disposed on one side of the stator 50, and the lead terminal 72 and the board 73 are arranged. A cover 76 covering the connector 74 and the upper portion of the lead wire 75 is attached, and the cover 76 is filled and sealed with a resin 77 such as a silicone resin or an epoxy resin.

  On the other hand, on the lower surface 50 b side of the stator 50, a rotation preventing member 30 is attached and fixed so as to prevent relative rotation and relative movement between the stator 50, the can 20 and the valve body 10. Specifically, the anti-rotation member 30 is manufactured by sheet metal processing, and as can be understood with reference to FIGS. 2 and 5, an annular flat plate portion 31 having an opening 32 through which the can 20 can be inserted. Have On the lower surface 50b side of the stator 50 (the mold resin 60 thereof), a total of eight rod-like portions 64 project downward at 45 ° intervals, and the rod-like portion 64 is inserted into the annular flat plate portion 31. A total of eight possible round holes 33 are formed at 45 ° intervals.

  The anti-rotation member 30 is fixed to the stator 50 by passing the rod-like portion 64 through the round hole 33 and ultrasonicating some of the eight rod-like portions 64 (four at 90 ° in this case). It is made by melting and crushing with a welder or the like (reference numeral of the crushed bar-like portion is 64 ').

  Further, four inverted L-shaped plate portions 35 are cut and raised at 90 ° intervals on the opening 32 side (inner peripheral side) of the annular flat plate portion 31 of the anti-rotation member 30, and the inverted L-shaped plate portions. The horizontal side portion of 35 is a pressing portion 36 for pressing a conduction spring 40 to be described later to the yoke 54 side, and the vertical side portion of the inverted L-shaped plate portion 35 is the stator 50, the can 20, and the valve body 10. The engaging portion 37 is used to prevent relative rotation and relative movement of the engagement portion 37. The engagement portion 37 is formed with an engagement hole 38 formed of a round hole, an elliptical hole, or the like, and a hemispherical protrusion 22 that fits into the engagement hole 38 is formed around the can 20. Four are formed in the direction.

  Therefore, the anti-rotation member 30 is attached and fixed to the stator 50 as described above, and the stator 50 is externally fitted to the can 20, and the engagement formed on the engagement portions 37 of the four inverted L-shaped plate portions 35. By fitting the four protrusions 22 formed on the can 20 into the holes 38, the engaging portion 37 of the inverted L-shaped plate portion 35 is bent outward, and the spring force causes the protrusion 22 and the engagement hole to be bent. 38, and the stator 50 is fitted on and fixed to the can 20 to prevent relative rotation and relative movement (disconnection).

In the motor-operated valve 1 of the present embodiment, the magnetic pole teeth 54C of the yoke 54 located on the lowermost side are suppressed so as to prevent unwanted discharge from occurring between the yokes 51, 52, 53, 54 and the can 20. Between the above-described lower surface exposed portion S that is not covered with the mold resin 60 and the anti-rotation member 30, the elastic metal wire material (or elastic resin material) having conductivity is formed into a notched annular shape. A conduction spring 40 that is elastically deformable in the vertical direction is interposed.
Hereinafter, the conduction spring 40 will be described in detail.

  The distance K (see FIG. 2) from the lower surface of the square convex portion 63 to the lower surface 50b of the stator 50 is substantially the same as or larger than the diameter of the elastic metal wire constituting the conductive spring 40, and is conductive. The outer diameter of the spring 40 is substantially the same as the inner diameter of the annular flat plate portion 54A of the yoke 54 and the diameter (inner diameter) of the cylindrical surface portion 65 formed on the lower surface side of the stator 50.

  Further, as shown in FIG. 6, the conduction spring 40 is higher (height) than the separation distance L (FIG. 2) between the lower surface exposed portion S of the magnetic pole teeth 54 </ b> C and the anti-rotation member 30 (the upper surface thereof). The angle intervals (here, 90 °, 90 °, and 180 °) corresponding to multiples of the angle interval (30 °) between the adjacent magnetic pole teeth 54C-54C. ) Is formed. The one end 40a and the other end 40b of the conduction spring 40 are located slightly closer to the mountain-shaped bent portion 43 between the mountain-shaped bent portions 41 and 43 that are spaced apart by 180 °.

  2 and 5, the conduction spring 40 is disposed along the cylindrical surface portion 65 formed on the lower surface side of the stator 50, and the top portions of the mountain-shaped bent portions 41, 42, 43 are formed. While being pressed against the lower surface exposed portion S of the magnetic pole teeth 54C, the four bent portions 41 and the pressing portions 36 (lateral sides of the inverted L-shaped plate portion 35) provided on the anti-rotation member 30 are 42, a portion between the mountain-shaped bent portions 42 and 43, a portion between the mountain-shaped bent portion 41 and one end 40a, and a mountain-shaped bent portion 43 and the other end 40b. Is pushed up and is sandwiched between the pressing portion 36 and the square convex portion 63 provided on the lower surface side of the stator 50.

  In this case, the height H of the mountain-shaped bent portions 41, 42, 43 of the conduction spring 40 is larger than the separation distance L between the lower surface exposed portion S of the magnetic pole teeth 54C and the anti-rotation member 30 (the upper surface thereof) in the natural state. Therefore, the conduction spring 40 is elastically deformed in the vertical direction, and the tops of the mountain-shaped bent portions 41, 42, 43 are elastically pressed against the lower surface exposed portions S of the magnetic pole teeth 54C.

  In addition, the part between the mountain-shaped bent part 41 and the one end part 40a and the part between the mountain-shaped bent part 43 and the other end part 40b are pressed by the pressing part 36. If not pressed, the one end portion 40a and the other end portion 40b are lifted and the spring property of the conduction spring 40 is weakened.

  In order to interpose the conduction spring 40 as described above, for example, the stator 50 is turned upside down and the conduction spring 40 is arranged along the cylindrical surface portion 65, and the mountain-shaped bent portions 41, 42, The top part of 43 is brought into contact with the lower surface exposed part S of the magnetic pole teeth 54C, and then the rotation preventing member 30 is positioned and placed on the conduction spring 40 so that the pressing part 36 can press the aforementioned part. Then, the anti-rotation member 30 is pushed down to bring the annular flat plate portion 31 into contact with the lower surface 50b of the stator 50, and in this state, near the pressing portion 36 of the total eight rod-like portions 64 provided on the stator 50. The four rod-shaped parts 64 located are melted and crushed by an ultrasonic welder or the like. As a result, the anti-rotation member 30 is attached and fixed to the stator 50 with the conduction spring 40 interposed between the lower surface exposed portion S of the magnetic pole teeth 54 </ b> C of the yoke 54 and the anti-rotation member 30.

  By doing so, the conduction spring 40 is elastically deformed in the vertical direction, and the tops of the mountain-shaped bent portions 41, 42, 43 are elastically pressed against the lower surface exposed portion S of the magnetic pole teeth 54C. Therefore, the conduction spring 40 maintains an immobile state, and the yoke 54 (and the yokes 53, 52, 51 stacked on the yoke 54) is electrically connected to the rotation preventing member 30 via the conduction spring 40.

  Further, since the rotation preventing member 30, the can 20, and the valve body 10 are electrically connected with the protrusion 22 fitted into the engaging portion 37, the yokes 51, 52, 53, 54 and the can 20 and the valve body are connected. 10 is electrically connected through the conduction spring 40 and the anti-rotation member 30. The valve body 10 is grounded through conduits connected to the inlets 11 and 12 (joints). Therefore, even if high voltage noise is applied to the stator coils 50A, 50B, the yokes 51, 52, 53, 54 and the can 20 have the same potential. It is possible to reliably prevent the occurrence of undesired discharge in the meantime, and to reduce the adverse effects on the peripheral circuits.

  In addition, since the member that electrically connects the non-rotating member and the yoke is the conduction spring 40 having a dimension and shape that matches the structure of the existing stator, the existing stator or mold for molding is modified. In addition, the conduction spring 40 is manufactured only by bending an elastic metal wire that can be obtained at a low cost into a specific shape, so that the manufacturing cost and the product cost can be kept low.

  The conduction spring has been described as being bent using an elastic metal wire as a raw material. However, the present invention is not particularly limited to this, and is completely annular without the end portions (40a, 40b). It may be a thing. Further, the shape of other conductive springs and the number and position of the mountain-shaped bent portions are not limited to those of the above-described embodiments, and can be changed as appropriate, and the shape of the anti-rotation member Needless to say, the number, position, and the like of the pressing portions are not limited to those of the above-described embodiments, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Valve main body 20 Can 22 Protrusion part 30 Anti-rotation member 31 Annular flat plate part 35 Inverted L-shaped plate part 36 Holding part 37 Engagement part 38 Engagement hole 40 Conducting spring 41, 42, 43 Mountain-shaped bending Part 50 stator 50A, 50B stator coil 51, 52, 53, 54 yoke 54A annular flat plate part 54C magnetic pole tooth 54d horizontal side part 54e vertical side part S lower surface exposed part 57, 58 coil 60 mold resin 63 square convex part 65 cylindrical surface part

Claims (10)

A valve body having a valve chamber, a valve seat, a valve body, and an inlet / outlet, and having a cylindrical body with a ceiling portion and a lower end portion of the cylindrical can are hermetically bonded, with a predetermined gap disposed around the inner periphery of the can A stator molded to the can to rotationally drive the rotor formed, and a rotation-preventing member is fixedly attached to the lower surface of the stator to prevent relative rotation between the stator and the valve body, An electric valve that adjusts the flow rate by moving the valve body to and away from the valve seat using rotation of a rotor,
The stator includes a yoke having an annular flat plate portion and a predetermined number of claw-shaped magnetic pole teeth cut and raised at an inner circumferential side of the annular flat plate portion at a predetermined angular interval. An annular conduction spring that is elastically deformable in the vertical direction is interposed between the lower surface exposed portion that is not coated with the mold resin and the rotation preventing member,
The conduction spring has a shape along a circular arc of a circle having substantially the same inner diameter as the inner diameter of the annular flat plate portion of the yoke,
The motor-operated valve according to claim 1 , wherein a mountain-shaped bent portion that is higher than a separation distance between a lower surface exposed portion of the magnetic pole teeth and the rotation preventing member in a natural state is formed at a plurality of locations in the conduction spring . 2. The motor-operated valve according to claim 1, wherein the mountain-shaped bent portions of the conduction spring are formed at a plurality of positions with an angular interval corresponding to a multiple of the angular interval between the adjacent magnetic pole teeth.   2. A cylindrical surface portion having an inner diameter substantially the same as an inner diameter of an annular flat plate portion of the yoke is formed on a lower surface side of the stator, and the conduction spring is disposed along the cylindrical surface portion. Or the motor operated valve of 2.   The anti-rotation member has a plate-like portion formed with an opening through which the can can be inserted, and a plurality of pressing portions for pressing the conduction spring against the yoke side are provided on the opening side of the plate-like portion. The motor-operated valve according to any one of claims 1 to 3, wherein the motor-operated valve is provided.   The anti-rotation member has a plate-like portion formed with an opening through which the can can be inserted, and a plurality of inverted L-shaped plate portions are cut and raised on the opening side of the plate-like portion. The horizontal side portion of the L-shaped plate portion serves as a pressing portion for pressing the conduction spring against the yoke side, and the vertical side portion of the inverted L-shaped plate portion performs relative rotation between the stator and the valve body. The motor-operated valve according to any one of claims 1 to 3, wherein the motor-operated valve is an engaging portion for blocking.   At least a portion between the one end portion of the conduction spring and the mountain-shaped bent portion and a portion between the other end portion of the conduction spring and the mountain-shaped bent portion are pressed by the pressing portion. The motor-operated valve according to claim 4 or 5, wherein positions of the conduction spring and the rotation prevention member in a rotation direction are set.   On the lower surface side of the stator, a rectangular convex portion made of a mold resin is provided so as to be positioned between the magnetic pole teeth in a plan view and project downward from the lower surface of the magnetic pole teeth. 6. The motor-operated valve according to claim 4, wherein a portion other than the mountain-shaped bent portion of the conduction spring is sandwiched between the holding portion of the rotation preventing member.   8. The motor-operated valve according to claim 7, wherein a distance between a lower surface of the square convex portion and a lower surface of the stator and a diameter of an elastic wire constituting the conduction spring are substantially the same.   An engagement hole for preventing relative rotation between the stator and the valve body is formed in the vertical side portion of the inverted L-shaped plate portion of the rotation preventing member, and the engagement hole is formed in the can. The motor-operated valve according to claim 5, wherein a protrusion to be fitted is formed.   The motor-operated valve according to any one of claims 1 to 9, wherein the conduction spring is bent into a notch annular shape using a conductive elastic wire as a material.

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