JP2004239428A - Electric valve - Google Patents

Abstract

An object of the present invention is to attach and prevent a stator coil assembly with a sufficient attachment strength without increasing the number of parts and the number of assembly steps.
A protruding portion is integrally formed on an outer peripheral portion of a disk-shaped lid member provided with a valve port of an electric valve controlled by a stepping motor, and is provided on a stator coil assembly. The engagement piece 37 is attached, and the forked engagement piece 37 is engaged with both sides of the projection 39.
[Selection diagram] Fig. 1

Description

  The present invention relates to a motor-operated valve, and more particularly to a motor-operated valve driven by a stepping motor.

  A disc-shaped lid member (base plate) for sealingly closing the case is fixedly secured to the open end of the bottomed cylindrical case, and a valve element and a rotor of a stepping motor are arranged in the case. 2. Description of the Related Art There is known an electric valve in which a stator coil assembly of a motor is fitted and mounted, a valve port is provided on a lid member side, and a valve body is driven by a stepping motor (for example, Patent Document 1).

  In the electric valve driven by the stepping motor as described above, the stator coil assembly is fixed in the circumferential direction (magnetic pole arrangement direction) with respect to the outer periphery of the case for phase adjustment, inversion phase adjustment, valve opening point alignment, and the like. Must be mounted in a different position. As this circumferential positioning structure, a structure in which a protruding end portion of a positioning piece provided integrally with a stator coil assembly is engaged with a positioning recess formed on an outer wall of a valve housing (for example, Patent Document 2, 3) a bifurcated locking piece attached to a stator coil assembly that straddles and engages a pipe joint fixed to a valve housing (for example, Patent Document 3); a bifurcated locking attached to a stator coil assembly There is one that engages a piece with a positioning pin such as a spring pin that is driven into the outer wall of the valve housing (for example, Patent Document 4).

Further, a plurality of positioning recesses of the outer wall of the valve housing are provided in the circumferential direction of the outer wall of the valve housing, and the convex portion at the tip end of the positioning piece is engaged with one selected positioning recess, or a bifurcated locking piece is provided. There is a type in which a lead-out position (connector position) of a lead wire of a stator coil assembly can be changed in a circumferential direction with respect to a valve housing by attaching a mounting bracket in a circumferential direction of a stator coil assembly so as to be changeable. For example, Patent Documents 3 and 4).
JP 2002-147900 A JP-A-8-313823 JP-A-2000-74245 JP 2001-32954 A

  When the convex portion at the tip of the positioning piece provided on the stator coil assembly is engaged with the positioning concave portion on the outer wall of the valve housing, there is insufficient rotation resistance and instability, and sufficient mounting strength (position holding strength) is obtained. Difficult to structure. Further, if it is attempted to prevent the stator coil assembly from slipping out (positioning in the axial direction) only by the engagement of the concave and convex, it is difficult to secure a sufficient strength to prevent the slipping out.

  In the case where the forked locking piece attached to the stator coil assembly is straddled and engaged with a pipe joint fixed to the valve housing, the circumferential position of the stator coil assembly is uniquely determined by the position of the pipe joint. A structure in which the lead wire withdrawal position (connector position) of the assembly cannot be changed cannot be provided. Unless the fitting accuracy of the pipe joint is increased, the required circumferential mounting position accuracy of the stator coil assembly cannot be obtained.

  In the case where the forked locking piece attached to the stator coil assembly is driven into the outer wall of the valve housing to engage with both sides of the positioning pin, the positioning pin is required to be driven, which increases the number of parts and the number of assembly steps. . Also, in order to obtain the required accuracy of the circumferential mounting position of the stator coil assembly, dimensional accuracy, machining accuracy and assembly accuracy of both the positioning pin and the pin hole of the outer wall of the valve housing are required. It is difficult to control the dimensions because no pins are missing.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to obtain sufficient mounting strength without increasing the number of parts and the number of assembling steps, and to easily obtain a required stator coil assembly. It is an object of the present invention to provide a motor-operated valve that can secure the accuracy of the circumferential mounting position and can easily change the lead wire withdrawal position of the stator coil assembly.

  In order to achieve the above object, a motor-operated valve according to the present invention includes a case having a bottom cylindrical shape, and a lid member fixed to an open end of the case and sealingly closing the case. A valve body, a rotor of the stepping motor are arranged, a stator coil assembly of the stepping motor is fitted and mounted on the outer periphery of the case, a valve port is provided on the lid member side, and the valve body is driven by the stepping motor. In the electric valve, the lid member has a disk shape, and a protrusion is integrally formed on an outer peripheral portion thereof, and a bifurcated locking piece is attached to the stator coil assembly. Stop pieces engage both sides of the projection.

  In the motor-operated valve according to the present invention, the protrusions are formed at a plurality of positions in the circumferential direction of the outer peripheral portion of the lid member, and the forked locking pieces are engaged with one protrusion selected from the plurality of protrusions. Structure.

  In the motor-operated valve according to the present invention, the protrusion may be formed integrally with the outer peripheral portion of the cover member by a punching press process or the like, and the cover member may be a press-formed product having the protrusion. The projection may be formed by punching a sheet metal member fixed to the lid member by fixing means such as brazing or welding.

  Further, in the electric valve according to the present invention, the bifurcated locking piece is further formed on an annular mounting member joined to a lower bottom surface of the stator coil assembly, and the lower bottom surface of the stator coil assembly and the circle At least one concavo-convex engaging portion is formed on one of the outer peripheral portions of the annular mounting member, and concavo-convex engaging portions are formed on a plurality of positions in the circumferential direction on the other, respectively, and the concavo-convex engaging portion of the stator coil assembly is provided. The annular member is mounted on the stator coil assembly such that the circumferential mounting position can be changed by uneven engagement between the annular member and the uneven engagement portion of the annular member.

  In the motor-operated valve according to the present invention, the annular mounting member is further provided with a non-return engagement claw for non-return engagement in the axial direction on the outer peripheral portion of the lid member.

  In the motor-operated valve according to the present invention, a mounting piece (mount bracket) for mounting the valve device can be formed integrally with the annular mounting member.

  According to the electric valve according to the present invention, the forked locking piece attached to the stator coil assembly is engaged with the projection so as to sandwich the projection integrally formed on the outer peripheral portion of the lid member from both sides. As a result, the stator coil assembly can be fixed to the lid member that forms the main body together with the case in a circumferentially positioned state with sufficient mounting strength as compared with the concave and convex engagement.

  According to the electric valve according to the present invention, the forked locking piece attached to the stator coil assembly is engaged with the projection so as to sandwich the projection integrally formed on the outer peripheral portion of the lid member from both sides. As a result, the stator coil assembly is fixed to the lid member forming the main body side together with the case in a circumferentially-positioned state with sufficient attachment strength as compared with the concave-convex engagement. Since the protruding portion with which the forked locking piece engages is formed integrally with the lid member, the projection is compared with a case where the forked locking piece is engaged with a pipe joint or a spring pin attached to the valve housing. As a result, the accuracy of the circumferential mounting position of the stator coil assembly can be easily increased.

  According to the motor-operated valve according to the present invention, the protrusion is formed at a plurality of positions in the circumferential direction of the outer peripheral portion of the lid member, and the forked locking piece is attached to one protrusion selected from the plurality of protrusions. With the engagement structure, the lead wire withdrawal position of the stator coil assembly can be changed by selecting the protrusion for engaging the forked locking piece.

  According to the motor-operated valve according to the present invention, if the protrusion is formed integrally with the outer peripheral portion of the lid member by punching press working or the like, sufficient mounting can be achieved without increasing the number of parts and the number of assembly steps. The strength can be obtained, and the required accuracy of the circumferential mounting position of the stator coil assembly can be ensured.

  According to the motor-operated valve according to the present invention, the circumferential mounting position of the annular member with respect to the stator coil assembly is changed by the uneven engagement between the uneven engagement portion of the stator coil assembly and the uneven engagement portion of the annular member. Also, the lead wire withdrawal position of the stator coil assembly can be changed at the attachment portion of the annular member to the stator coil assembly.

  ADVANTAGE OF THE INVENTION According to the electrically operated valve by this invention, the non-return engagement claw provided in the annular mounting member engages in the axial direction in a non-return engagement with the outer peripheral part of a lid member, compared with the case where only concave-convex engagement is carried out. As a result, the stator coil assembly is securely prevented from falling off (positioning in the axial direction), and a sufficient retaining strength can be secured.

  According to the motor-operated valve according to the present invention, it is further possible to integrally form the mounting piece for mounting the valve device on the annular mounting member, and to mount the motor-operated valve by the mounting piece without increasing the number of parts.

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

  1 to 6 show one embodiment of a motor-operated valve according to the present invention.

  As shown in FIG. 1, the motor-operated valve has, as fixed members, a case 10 having a bottomed cylindrical shape (can shape) formed by deep drawing and a disc-shaped lid member 11. The lid member 11 is hermetically fixed to the opening end 10A of the case 10 by welding to hermetically cover the case 10 and defines a valve chamber / rotor chamber 12 having a sealed structure in the case 10.

  The lid member 11 is a stamped and press-formed product, and has ports 13 and 14 formed at the center position and at positions deviated laterally from the center position. Pipe joints 15, 16 connected to the ports 13, 14 are brazed to the lower bottom side of the lid member 11.

  An embossed portion 11A and a positioning projection 11B are press-molded on the upper surface of the lid member 11 (the surface on the side of the valve chamber / rotor chamber 12). Are positioned and fixed to the lid member 11 by brazing or the like. The valve seat plate 17 is formed with a valve port 27 that communicates with the port 13 and a cutout 17A that aligns with the port 14. With this structure, the port 14 is always in communication with the valve chamber / rotor chamber 12.

  On the upper surface of the valve seat plate 17, a tripod cage-shaped (see FIG. 3) female screw holder 18 press-formed is fixedly mounted. The female screw holder 18 holds the female screw member 19 at the same position as the center position of the valve seat plate 17. As shown in FIG. 3, the female screw member 19 is engaged with the leg 18A of the female screw holder 18 by a concave groove 19A formed in the outer peripheral portion and is stopped from rotating. The movement in the axial direction is prevented by being sandwiched between the portion 18B and the lower locking claw 18C.

  Above the female screw holder 18, a stopper portion 18D of the rotating plate 28 and a retaining portion 18E described below are press-formed.

  As shown in FIG. 1, a rotor 21 of a stepping motor 20 is rotatably disposed in the valve chamber / rotor chamber 12. The rotor 21 has an outer peripheral portion 21A that is multipolar magnetized, and a rod-shaped valve body 22 that is caulked with an internal boss 21B together with a caulking fixture 23. As shown in FIG. 3, the caulking fixture 23 is formed with irregularities on both the upper and lower surfaces and the inner peripheral surface, for the purpose of preventing slippage and securing the caulking. Forming the same irregularities as the caulking fixture 23 on the upper surface of the internal boss 21B with which the caulking fixture 23 abuts is also effective in preventing slippage between the caulking fixture 23.

  The valve body 22 is caulked to the rotor 21 at the upper end 22A. The valve element 22 is located at the center of rotation of the rotor 21, and has a male screw part 25 that is screw-engaged with the female screw hole 24 of the female screw member 19, and a flow control valve part 26 that opens and closes a valve port 27.

  A rotary plate 28 having a projection 28A between the upper annular portion 18B of the female screw holder 18 and the retaining portion 18E is loosely fitted on the outer periphery of the valve body 22. The rotating plate 28 contacts the key-shaped projection 21C of the rotor 21 at the projection 28A and is rotated by the rotor 21. The rotating plate 28 abuts against the stopper 18D to form a fully open side and a fully closed side stopper.

  The valve element 22 is driven to rotate by the rotor 21, and moves in the axial direction by screw engagement between the male screw part 25 and the female screw hole 24 of the female screw member 19, and the valve port 27 is opened and closed by the flow control valve part 26, and the flow rate is controlled. Perform control quantitatively.

  A stator assembly 29 of the stepping motor 20 is positioned and mounted on an outer peripheral portion of the case 10. The stator assembly 29 has an outer casing 30, upper and lower stator coils 31, a plurality of magnetic pole teeth 32, an electrical connector section 33, and the like, and is liquid-tightly sealed with a sealing resin. The stepping motor 20 divides and drives the rotor 21 by energizing the stator coil 31 of the stator assembly 29.

  The stator assembly 29 has a cylindrical shape having a central opening 29 </ b> A (see FIG. 2) having a circular cross section that fits on the outer periphery of the case 10. An annular mounting plate (bracket) 35 is mounted on the lower bottom surface of the outer box 30.

  The annular mounting plate 35 is a press-formed product, and as shown in FIG. 4, an annular portion 36 having a plurality of notch engaging portions (concavo-convex engaging portions) 36 </ b> A formed on an outer peripheral portion thereof. A fork-shaped engaging piece 37 having a forked portion 37A bent from the annular portion 36, and a non-returning piece having a check engaging claw 38A (see FIG. 5) bent from the annular portion 36. 38 are integrally formed.

  As shown in FIG. 2, two positioning projections (concavo-convex engaging portions) 30A and two hook-shaped mounting engaging portions 30B are press-formed on the lower bottom surface of the outer box 30 as shown in FIG. . The annular mounting plate 35 has two notch engaging portions 36A, two of which face each other across the center of the annular portion 36, respectively, and engage with the two positioning protrusions 30A of the outer casing 30 in an uneven manner. The two outer peripheral edges opposed to each other with the center of 36 being engaged with the two mounting engagement portions 30B, respectively, so that the circumferential mounting position can be mounted on the stator coil assembly 29 so as to be changeable.

  In this embodiment, as shown in FIG. 4, as the application to a 20-pole stepping motor, ten notch engaging portions (concavo-convex engaging portions) 36A, which are multiples of 5, are provided at equal intervals. Therefore, the mounting position of the annular mounting plate 35 with respect to the stator coil assembly 29 can be arbitrarily changed in increments of 36 degrees.

  As shown in FIG. 1, a tongue-shaped projection 39 is integrally formed on the outer peripheral portion of the lid member 11 by punching and press molding. The forked portion 37A formed on the forked engagement piece 37 of the annular mounting plate 35 is engaged with the protruding portion 39 so as to straddle both sides. That is, the bifurcated engagement piece 37 sandwiches the projection 39 from both sides by the bifurcated pieces 37B and 37C, and fixes the stator coil assembly 29 to a predetermined circumferential position.

  With this anti-rotation fixing structure, the stator coil assembly 29 is fixed to the cover member 11 which forms the main body together with the case 10 in the circumferential positioning state with sufficient circumferential mounting strength as compared with the uneven engagement. The protrusion 39 with which the forked engaging piece 37 is engaged is formed integrally with the lid member 11, so that the protrusion 39 is compared with a case where the forked engaging piece is engaged with a pipe joint or a spring pin attached to the valve housing. Thus, the accuracy of the circumferential mounting position of the stator coil assembly 29 can be easily increased.

  Since the projection 39 is formed integrally with the outer peripheral portion of the lid member 11 by punching and pressing, sufficient mounting strength can be obtained without increasing the number of parts and the number of assembly steps, and there is no assembly error. Thus, the accuracy of the circumferential mounting position of the stator coil assembly 29 can be set high.

  Further, the non-return engagement claw 38A formed on the non-return piece 38 of the annular mounting plate 35 is non-reversely engaged with the outer peripheral portion of the lid member 11 in the axial direction, so that the stator coil assembly 29 is prevented from coming off. (Axial positioning) is performed. The retaining by the reverse engagement can surely and sufficiently obtain the retaining strength as compared with the case where only the concave and convex engagement is provided.

  Further, since both the lid member 11 and the annular mounting plate 35 are press-formed products, the degree of freedom of the shape is high, and the cost can be reduced.

  FIG. 7 shows a main part of another embodiment of the motor-operated valve according to the present invention. In this embodiment, as an application to a 20-pole stepping motor, the protrusions 39 are formed at a plurality of circumferential positions (5 positions, 72-degree intervals) on the outer peripheral portion of the lid member 11. The forked portion 37A of the forked engagement piece 37 is engaged with one of the selected protrusions 39 so as to straddle both sides in the same manner as in the above-described embodiment.

  As a result, the stator coil assembly 29 is fixed to the lid member 11 with sufficient attachment strength in the circumferential positioning state, and the protrusion 39 for engaging the fork-shaped engaging piece 37 is selected. The position of the lead wire 29 (the position of the electrical connector portion 33 in the rotation direction with respect to the lid member 11) can be changed. The change of the arrangement position is also performed by changing the circumferential mounting position of the annular mounting plate 35 with respect to the stator coil assembly 29, and the combination position can be changed.

  FIG. 8 shows a main part of another embodiment of the motor operated valve according to the present invention. In this embodiment, a mounting piece (mount bracket) 41 for mounting a valve device, in which a mounting bolt through hole 40 is formed, is formed integrally with the annular mounting plate 35 by bending.

  Thus, the motor-operated valve can be attached to the place of use by the attachment piece 41 without requiring a separate component such as a mount bracket, and the number of components can be reduced.

  Further, in this embodiment, by bending the edges on both sides of the bifurcated portion 37A of the bifurcated engagement piece 37 of the annular mounting plate 35 toward the center of the annular mounting plate 35, the two non-return engagements are formed. The claw portion 38A is formed, whereby the check piece 38 is omitted, so that the molding is easy and the structure is simple.

  9 and 10 show a main part of another embodiment of the motor operated valve according to the present invention. In this embodiment, a positioning plate 43 made of a press-formed product formed by stamping out the projection 42 is used. A positioning hole 44 is formed in the positioning plate 43, a positioning protrusion 45 is formed in the lid member 11, and the positioning plate 43 is positioned on the lid member 11 by engagement of the positioning hole 44 and the positioning protrusion 45, and welding is performed. The positioning plate 43 is fixedly integrated with the lid member 11 by brazing or the like.

  Accordingly, in this embodiment, the forked portion 37A of the forked engagement piece 37 is engaged with the protrusion 42 so as to straddle both sides in the same manner as in the above-described embodiment, thereby providing the same as in the above-described embodiment. In addition, the stator coil assembly 29 is fixed together with the case 10 to the cover member 11 forming the main body side in a circumferentially positioned state with sufficient mounting strength as compared with the concave and convex engagement.

  The motor-operated valve according to the present invention is not limited to the flow control valve having the above-described structure, and can be similarly applied to various types of flow control valves driven by a stepping motor, and can be applied to various types of flow control valves driven by a stepping motor. The present invention can be similarly applied to a road switching valve and the like.

It is a longitudinal section showing one embodiment of an electric valve by this invention. FIG. 2 is a partial perspective view of the stator assembly of the motor-operated valve according to one embodiment of the present invention as viewed from the bottom surface side. FIG. 3 is an exploded perspective view of a rotor / valve coupling portion and a female screw member holding portion of the electric valve according to the embodiment of the present invention. 1 is a perspective view of an annular mounting plate of a motor-operated valve according to one embodiment of the present invention. FIG. 5 is a view on arrow A in FIG. 4. FIG. 2 is a perspective view showing a combined body of a case and a cover member of the motor-operated valve according to one embodiment of the present invention. It is a perspective view of the combination body of the case and the cover member by other embodiments of the electric valve by this invention. FIG. 5 is a perspective view of an annular mounting plate according to another embodiment of the motor-operated valve according to the present invention. It is a perspective view of the combination body of the case and the cover member by other embodiments of the electric valve by this invention. FIG. 6 is a perspective view of a positioning plate used in another embodiment of the motor-operated valve according to the present invention.

Explanation of reference numerals

Reference Signs List 10 case 11 lid member 12 valve chamber / rotor chamber 17 valve seat plate 18 female screw holder 19 female screw member 20 stepping motor 21 rotor 22 valve body 24 female screw hole 25 male screw part 26 flow control valve part 27 valve port 29 stator assembly 30 outside Box 30A Positioning protrusion 30B Mounting engagement part 31 Stator coil 32 Magnetic pole tooth 33 Electrical connector part 35 Annular mounting plate 36 Annular part 36A Notch engagement part 37 Bifurcated engagement piece 37A Bifurcated part 38A Non-return engagement claw part 38 Check piece 39 Projection 41 Mounting piece 42 Projection 43 Positioning plate

Claims (8)

A case having a bottomed cylindrical shape, and a lid member fixed to the open end of the case and sealingly closing the case, a valve body, a rotor of a stepping motor are arranged in the case, A stator coil assembly of the stepping motor is fitted and mounted on an outer periphery, a valve port is provided on the lid member side, and the stepping motor drives the valve body.
The lid member has a disk shape, and a protrusion is integrally formed on an outer peripheral portion thereof, and a bifurcated locking piece is attached to the stator coil assembly.
An electric valve in which the forked locking piece is engaged on both sides of the projection.   2. The projection according to claim 1, wherein the protrusion is formed at a plurality of positions in a circumferential direction of an outer peripheral portion of the lid member, and the fork-shaped locking piece is engaged with one protrusion selected from the plurality of protrusions. Electric valve.   The motor-operated valve according to claim 1, wherein the protrusion is formed integrally with an outer peripheral portion of the lid member.   The motor-operated valve according to claim 3, wherein the lid member is a press-formed product having the protrusion.   The motor-operated valve according to claim 1, wherein the protrusion is formed by punching a sheet metal member fixed to the cover member by fixing means such as brazing or welding.   The forked locking piece is formed on an annular mounting member that is joined to a lower bottom surface of the stator coil assembly, and is provided on one of the lower bottom surface of the stator coil assembly and the outer peripheral portion of the annular mounting member. And at least one concave-convex engaging portion, and on the other, concave-convex engaging portions are respectively formed at a plurality of positions in the circumferential direction, and the concave-convex engaging portion of the stator coil assembly and the concave-convex engaging portion of the annular member are formed. The motor-operated valve according to any one of claims 1 to 5, wherein the annular member is attached to the stator coil assembly so that a circumferential attachment position can be changed by the concave / convex engagement.   The motor-operated valve according to claim 6, wherein the annular mounting member has a non-return engagement claw that is non-returnly engaged with the outer peripheral portion of the lid member in the axial direction.   The motor-operated valve according to claim 6, wherein the annular mounting member is formed integrally with a mounting piece for mounting a valve device.

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