JP2011208729A - Electric valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric valve preventing a fitting failure of a stator to a can when fitting the stator to a valve body, and preventing removal of the stator from the valve body by easily, accurately and surely fitting the stator to the can.SOLUTION: When fitting the stator 50 to the outside of the cylindrical can 20, positioning of the stator 50 relative to the can 20 in the circumferential direction is performed by engaging one of a plurality of projections 30 of the can 20 with a positioning hole of a positioning part 110 of a fitting means 100 to be fixed to the stator 50. In a fall-stopper part 120 included in the fitting means 100, since the projection 30 of the can 20 is fitted in an oblong hole, when the stator 50 is drawn from the valve body 10 or the can 20 in the rotary axial direction of a rotor, the projection 30 butts on an upper and a lower hole edges of the oblong hole, and the projection 30 is engaged to prevent the stator 50 from drawing out.

Description

  The present invention relates to a motor-operated valve that includes a can that rotatably incorporates a rotor and a stator that is externally fitted to the can to drive the rotor, and in particular, a motor-operated valve characterized by a structure for fixing the stator to the can. About.

  Conventionally, this type of motorized valve is composed of a member called a can made of a non-magnetic metal in a cylindrical shape, a rotor housed in the can, and a coil unit, and is detachable from the outer periphery of the can. And a stator having a donut shape to be fitted. The rotor and the stator are combined to form a stepping motor. The rotor is rotationally driven by the stator, and the rotation of the rotor is reduced by a reduction mechanism such as a gear mechanism as necessary, and then converted into a linear motion in the valve axis direction of the valve element by a screw mechanism. By controlling the valve opening degree, that is, the flow rate through the orifice, the valve body is brought into contact with and separated from the orifice arranged in the valve main body by this linear motion.

  The following patent document proposes an example of a motor-operated valve that is small, has a large output, and has a high resolution by being housed and disposed in a single can together with a rotor. That is, a valve rod having a valve body is inserted into the motor-operated valve body, a rotor is mounted in a can fixed to the body side, and a so-called wonder planetary gear mechanism is provided inside the rotor. The device is housed. In this reduction gear, the output of the rotor is input to the sun gear and transmitted from the sun gear to the planetary gear. The planetary gear simultaneously meshes with a fixed gear and an output gear having a slightly different number of teeth from that of the fixed gear, and the output gear is driven to reduce at a large reduction ratio based on the difference in the number of teeth. The rotational output of the output gear is transmitted to the screw shaft through a screwdriver, and the rotational motion is converted into the linear motion in the axial direction of the valve stem by the screw action of the screw shaft. Move away.

  9 and 10 show an example of a conventional electric valve. FIG. 9 is an exploded perspective view of the motor-operated valve, and FIG. 10 is a perspective view showing the motor-operated valve after assembly. The stator 50 detachably attached to the valve main body 10 is attached to the valve main body 10 using an attachment member 80 having three elastic attachment portions (plate-like members) 83 after being fitted to the can 20. Fixed. The attachment member 80 is fixed to the stator 50 by fitting a boss 70 provided on the stator 50 into an attachment hole 82 formed in the annular body 81 and welding. The stator 50 is configured to be able to select any one of four attachment postures on the circumference of the can 20 with respect to the can 20. With this configuration, when the motor-operated valve is disposed in the refrigeration cycle, the stator mounting posture can be selected to be an optimal posture with respect to the counterpart device.

  Specifically, the four protrusions 30 formed on the outer peripheral portion of the can 20 are formed by punching formed on one of the three mounting portions 83 fixed to the stator 50. The stator 50 is fixed to the motor-operated valve body side by fitting the fitted holes 84. By forming the diameter of the hole 84 formed in the attachment portion 83 slightly smaller than the diameter of the lowest portion of the protrusion 30 formed on the outer peripheral portion of the can 20, the stator 50 is positioned with respect to the can 20 of the electric valve main body. Is done. With such a structure, the mounting portion 81 in which the hole 82 is formed presses the can 20 through the protrusion 30, and the remaining mounting portion 81 in which the hole 82 is not formed directly presses the can 20, so that the stator 50 It is positioned and fixed with respect to the can 20.

JP 2006-226369 A

  However, in the motor-operated valve having the positioning and fixing structure described above, when an impact is applied to the motor-operated valve due to, for example, dropping in the distribution process, the mounting position of the stator with respect to the valve body may deviate from the original position. Deviation may occur. In addition, it is difficult to align the positions for fitting by fitting the protrusions and the holes, and there is a concern that it may take time for the mounting or a mounting failure may occur.

  An object of the present invention is to provide a motor-operated valve capable of easily, accurately and reliably mounting a stator when assembling a stator to a valve body and preventing the stator from coming off from the valve body. That is.

  In order to solve the above-described problems, an electric valve according to the present invention includes a valve body that has a valve seat formed therein and that accommodates a valve body that can be moved toward and away from the valve seat, and is fixed to the valve body. A cylindrical can having a plurality of convex portions on the outside, a stator fitted on the outside of the can, and a stator provided on the stator so as to engage with the convex portions of the can. An attachment means that is detachably attached to the main body, and a rotor rotatably disposed inside the can is driven by the stator, and the valve body is directed to the valve seat based on the drive of the rotor. In the motor-operated valve that adjusts the flow rate of fluid by contacting and separating, the mounting means is engaged with a positioning portion having a positioning hole that engages with one of the convex portions, and the valve body or the can. The stator Te is characterized by comprising a retaining portion for preventing coming off the rotation axis direction of the rotor.

  According to this electric valve, when the stator is fitted and inserted into the outside of the cylindrical can, the positioning hole of the mounting means provided in the stator has the positioning holes of the plurality of convex portions of the can. By engaging one of them, the stator is positioned relative to the can. Even if the positioning portion does not have an effect of preventing the stator from coming out of the can due to an impact or the like, the retaining portion provided in the attachment means engages with the valve body or the can and the stator is rotated by the rotor. Therefore, the stator is held in that position while being positioned with respect to the can.

The motor-operated valve according to the present invention is configured as described above, and is positioned with respect to the can of the stator by the positioning portion and is prevented from being pulled out from the can of the stator by the retaining portion provided in the attachment means. Even if an impact is applied to the motor-operated valve due to a collision or the like at a distribution stage, the retaining portion provided in the mounting means in addition to the positioning portion engages with the valve body or the can and the stator comes out in the direction of the rotation axis of the rotor. Therefore, the stator does not come out of the can, and the state of the finished product can be kept good.
Also, when assembling the stator to the valve body, the mounting failure of the stator to the can is prevented, and the mounting is performed easily, accurately and reliably to prevent the stator from coming off the valve body. can do.

It is a disassembled perspective view which shows one Example of the motor operated valve by this invention. FIG. 2 is an assembled perspective view of the electric valve shown in FIG. 1. The expanded view explaining the positioning part and retaining part in the motor operated valve shown in FIG. FIG. 3 is an enlarged explanatory view showing details of a positioning portion in the electric valve shown in FIG. 2. It is a figure which shows the modification of the positioning part in the motor operated valve by this invention. It is a disassembled perspective view which shows the other Example of the motor operated valve by this invention. FIG. 7 is an assembled perspective view of the electric valve shown in FIG. 6. It is a figure which shows the modification of the positioning part and retaining part in the motor operated valve shown in FIG. It is a disassembled perspective view which shows an example of the conventional motor operated valve. FIG. 10 is an assembled perspective view of the electric valve shown in FIG. 9.

  Hereinafter, embodiments of a motor-operated valve according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing an embodiment of a motor-operated valve according to the present invention in a state where it is disassembled into a valve body and can assembly parts and a stator, and FIG. 2 is a completed view after the motor-operated valve shown in FIG. 1 is assembled. FIG.

  The motor-operated valve denoted as a whole by reference numeral 1 has a cylindrical valve body 10 made of a material such as brass, and pipes 12 and 14 are connected to the valve body 10. Although not shown in the drawings, the valve body 10 is provided with a valve chamber and a valve seat that communicates with the valve chamber, and accommodates a valve element that can move toward and away from the valve seat. A bottomed cylindrical can 20 made of a nonmagnetic material such as stainless steel is fixed to the upper portion of the valve body 10 via an attachment portion 22. A cylindrical rotor (not shown) is rotatably disposed in the can 20. The rotation of the rotor is converted into a linear motion by a screw mechanism (not shown), and the valve body is moved in the valve shaft direction by this linear motion to move toward and away from the valve seat. By controlling the position of the valve body with respect to the valve seat, the flow rate of a fluid such as a refrigerant passing through the valve and flowing through the pipes 12 and 14 can be controlled.

  A stator 50 having a coil unit is detachably mounted on the outer periphery of the can 20. In the stator 50, a bobbin around which an electric wire is wound is disposed and integrated with a synthetic resin. The stator 50 includes a cover portion 60 that accommodates a terminal on one side of the coil unit, and is connected to an external power supply side by a lead wire (not shown). The stator 50 outside the can 20 and the rotor inside the can 20 constitute a stepping motor, and the rotor can be rotated by a predetermined angle by a pulse fed to the stator 50 side. The valve body 10 to which the can 20 is fixed is supplied as a unit part as shown in FIG. 1, and the motor-operated valve 1 as a finished product as shown in FIG. 2 is obtained by assembling the stator 50.

  The stator 50 is a member in which the coil bobbin is covered with a synthetic resin, and a plurality of resin-made bosses 70 (in the illustrated example, eight pieces; only a part thereof) are projected below the lower portion of the stator 50. Attached). The attachment member 100 as the attachment means is provided in a state of being integrally fixed to the stator 50 by welding of the boss 70, and details thereof will be described later.

  In the vicinity of the opening end of the cylindrical can 20 that opens near the valve body 10, projections 30 that are a total of four convex portions are formed on the circumference at regular intervals of, for example, 90 degrees. . However, only two can be seen in FIGS. The protrusion 30 is formed by partially processing the can 20 from the inside of the can 20 using a tool such as a punch or a press. The protrusion 30 can be formed to be hemispherical, or to have a vertical cross-sectional shape that draws a part of a circle or an ellipse, or other curved surface.

  The attachment member 100 is made of an elastic metal plate and includes an annular main body 101 attached to the ring-shaped lower end surface 52 of the stator 50. A plurality of mounting holes 102 (eight in the example shown in the figure; only a part is given a symbol) for fitting the boss 70 are formed in the annular main body 101 at intervals aligned with the boss 70. By attaching the boss 70 fitted in the attachment hole 102 to the annular main body 101, the attachment member 100 is provided as being integrated with the stator 50. In the annular main body 101, a space 104 to be inserted into the outer periphery of the can 20 is formed. For example, four engagement portions are formed from the annular main body 101 so as to extend away from the stator 50 by bending. When the stator 50 is fitted to the outside of the can 20, the can 20 passes through the space 104, and each engaging portion extends along the outer peripheral surface of the can 20.

  FIG. 3 is a development view in which the attachment member 100 is developed in the circumferential direction of the annular main body 101 and a series of engaging portions are arranged side by side. When the stator 50 is mounted on the can 20, each engaging portion is urged in a direction to press the outer periphery of the can 20 by its own elasticity, and the protrusion 30 gets over the protrusion 30 while being bent, and the protrusion 30 becomes the positioning hole 200 or the horizontally long hole. 230 has a function of securely fixing the coil unit 50 to the outer peripheral portion of the can 20. Of the four engaging portions, one engaging portion constitutes the positioning portion 110 in which the positioning hole 200 is formed. The positioning unit 110 is responsible for positioning of the stator 50 in the circumferential direction and the rotor axial direction, and details thereof will be described later. Further, the other three engaging portions constitute a retaining portion 120 in which a laterally long hole 230 is formed in the lateral direction perpendicular to the axis of the rotor. The three retaining portions 120 can be configured in the same structure.

  In each retaining portion 120, in a state where the protrusion 30 is fitted in the horizontally long hole 230, when the stator 50 tries to come out from the can 20 in the thrust direction (rotor axial direction), the protrusion 30 is located above and below the horizontally long hole 230. , The displacement of the stator 50 in the rotor axial direction is restricted. Accordingly, each retaining portion 120 functions to effectively prevent the stator 50 from slipping out by supplementing the retaining action that makes the positioning portion 110 weak when it is alone. In the illustrated example, the retaining portion 120 is provided for all the protrusions 30 other than the positioning portion 110. However, the present invention is not limited to this, and one protrusion 30 or two protrusions 30 and 30 are provided. It can be provided only for. In this case, with respect to the remaining protrusion 30, the engagement portion is not perforated and can be held in a state where the protrusion 30 is pressed by its own elastic force, but there are many places where the retaining portion 120 is installed. Accordingly, the stator 50 can be reliably held with respect to the can 20 by being dispersed in the circumferential direction.

  In each retaining portion 120, there is flexibility in the relative position in the circumferential direction of the can 20 between the laterally long hole 230 and the protrusion 30. Therefore, when forming the laterally long hole 230 or the protrusion 30, an angular dimension (rotor axis line) Even if there is a slight variation in the angular dimension from the center when cutting in a direction perpendicular to the vertical direction, the manufacturing error between the laterally long hole 230 and the protrusion 30 when the positioning portion 110 is positioned in the circumferential direction. Can be absorbed. The horizontally long hole 230 may have a shape in which upper and lower hole edges are parallel and both ends are semicircular, or may be elliptical with the horizontal axis as the long axis.

The positioning part 110 has an oval positioning hole 200 as shown in FIG. The positioning hole 200 is formed in an egg shape in which the upper part on the stator side is formed in the small diameter part 204 and the lower part is formed in the large diameter part 202. That is, a circular large-diameter portion 202 is formed around a position where the protrusion 30 is to be positioned, a small-diameter portion 204 is formed so as to protrude above the large-diameter portion 202, and the contours thereof are connected by a straight line. Thus, the positioning hole 200 is formed. The large diameter portion 202 is set to be slightly smaller than the diameter of the lowest portion of the protrusion 30. Further, in this embodiment, the positioning hole 200 is formed by punching using, for example, a mold having the above shape, and the inner wall surface thereof is formed perpendicular to the surface of the mounting portion 110.
Therefore, for example, as shown in FIG. 4B, even if the position of the positioning hole 200 and the protrusion 30 in the height direction does not match at the time of assembly, the apex of the protrusion 30 is placed inside the entrance of the egg-shaped positioning hole 200. If the projection 30 can be inserted, the projection 30 is guided to the center of the egg-shaped positioning hole 200 (the center of the large diameter portion 202) and automatically aligned by the elasticity of the mounting portion. As a result, the protrusion 30 is engaged with the large diameter portion 202, and the stator 50 is attached to the exact position of the can 20 ((c) of FIG. 4).

FIG. 5 is an explanatory view for explaining another example of the positioning portion in the electric valve of the present invention.
In the embodiment shown in FIG. 5A, the positioning hole 210 formed in the positioning portion 110 has an inverted oval shape in which the upper portion is formed in the large diameter portion 212 and the lower portion is formed in the small diameter portion 214. . In this example, the egg-shaped positioning hole 200 shown in FIG. 4 is turned upside down, and the center of the large-diameter portion 202 having a circular outline is set at a position where the protrusion 30 is to be positioned. The function of the inverted egg-shaped 210 is the same as that described in FIG.
In the embodiment shown in FIG. 5B, the diamond-shaped positioning hole 220 has the functions of the embodiment shown in FIG. 4 and the embodiment shown in FIG. There are circular small-diameter portions 224 and 224 above and below 222, and they are connected by a straight line. That is, the positioning hole 220 has a rhombus shape having a long axis in the vertical direction. Therefore, if the center of the protrusion 30 is positioned in the upper and lower small diameter portions 224, the center of the protrusion 30 is guided to the center of the positioning hole 220 (center of the large diameter portion 222) and automatically aligned.

  The shape and structure of the positioning hole having the self-aligning action is not limited to the above example, and although not shown in the figure, for example, it may be formed in an elliptical shape having a long axis in the vertical direction, or the positioning hole The cross section is formed to have a tapered shape (the positioning hole is tapered so that the can side of the positioning portion 110 has a large diameter hole and the opposite side to the can has a smaller diameter hole and is connected by a conical side surface. Or the positioning hole can be formed into an R surface by burring (the R surface is formed by burring so that the can side of the positioning portion 110 has a large-diameter hole). The protrusion 30 can be automatically aligned to the most stable position of the positioning hole by the guiding action of the tapered surface) or the R surface. Note that the positioning holes are not limited to those having the above-described automatic alignment function, and may be formed in a simple circle. In addition, if a concave portion or a semicircular cutout portion is formed in the positioning portion 110 so that the protrusion 30 formed in the can enters the both ends adjacent to the positioning hole, the concave portion or After the protrusion 30 enters the notch, the protrusion 30 can be easily guided into the positioning hole.

  Another embodiment of the motor-operated valve according to the present invention is shown in an exploded perspective view in FIG. 6, and the assembled state is shown in a perspective view in FIG. The embodiment shown in FIGS. 6 and 7 and the embodiment shown in FIGS. 1 and 2 are the same except for the specific structure of the mounting member. The description is omitted by attaching. The attachment member 300 used for the motor-operated valve shown in FIGS. 6 and 7 is made of a metal plate having elasticity, like the attachment member 100, and includes an annular main body 301. A space 304 is formed in the outer periphery of the can 20. The attachment member 300 is provided as one that is integrally fixed to the stator 50 by welding the boss 70 in a state of being fitted in the plurality of attachment holes 302 to the annular main body 301. From the annular main body 301, for example, at least one engaging portion and at least one engaging leg are formed by bending so as to extend in a direction away from the stator 50. When the stator 50 is fitted to the outside of the can 20, the can 20 passes through the space 304, and each engaging portion extends along the outer peripheral surface of the can 20.

  One of the engaging portions is a positioning portion 310 having a structure similar to that of the positioning portion 110 shown in FIG. 3, and at least one engaging leg is a retaining portion 330 described in detail later. As shown in FIG. 6, when four engaging portions and engaging legs are provided in total, the remaining two are engaged portions or engaging portions functioning as retaining portions 320 and 330 as shown in FIG. In this case, the combination may be (a) a retaining portion 320 formed of an engaging portion similar to the retaining portion 120 as shown in FIG. 3, and (b) a retaining portion as shown in FIG. One retaining part 320 composed of the same engaging part as the part 120, and one engaging leg similar to the retaining part 330, and (c) both of the engaging legs similar to the retaining part 330, There are 3 types in total. Or about the remaining two, it can be set as the engaging part which presses the protrusion 30 with one's elastic force by making one or both non-porous. When only one of them is a non-porous engaging portion, the remaining one can be an engaging portion or an engaging leg that functions as the retaining portion 320 or the retaining portion 330.

  As shown in the figure, the engaging legs functioning as the retaining portion 330 include a leg main body 331 extending from the annular main body 301, and engaging claws 332 and 332 extending on both sides on the distal end side of the leg main body 331 and bent inward. And a tail portion 333 provided at the distal end of the leg main body 331 and slightly bent in the outer direction of the can. The engaging claws 332 and 332 are hooked on the attachment portion 22 of the can 20 to the valve main body 10, thereby facilitating the removal of the stator 50 from the can 20 without providing a special member on the valve main body 10 side. And it can block reliably. The attachment part 22 is an attachment part (a jaw part of the valve body) to the valve body 10 at the lower end of the can 20, and the can is attached to the body by welding at this part. The engaging claws 332 and 332 can be easily hooked on the attachment portion 22 by pinching the tail portion 333 and pulling it to elastically deform the leg main body 331. Even if the tail portion 333 is not pulled and pulled, the inclined surface (the surface of the tail portion 333 on the side of the can 20) or the engaging claw formed by the tail portion 333 being bent outward by pushing the stator 50 into the can 20. Since the leg main body 331 is elastically deformed by the inclined portion 332A on the distal end side of the 332 coming into contact with the surface of the can 20, if the pushing operation is continued as it is, the rear end 332B of the engaging claw 332 reaches the mounting portion 22. The deformation of the main body 331 is recovered, and then the rear end 332 </ b> B is caught by the attachment portion 22. Further, since the two engaging claws 332 and 332 are hooked on the fixed side on both sides of the retaining portion 330, the strength is increased and the hook is stable as compared with the case where the two engaging claws 332 and 332 are hooked with only one engaging pawl. Also improves.

  FIG. 7 is a perspective view showing the assembled motor-operated valve 2 shown in FIG. One engaging portion of the attachment member 300 functions as the positioning portion 31, and one engaging leg provided at a position facing the positioning portion 31 in the radial direction functions as the retaining portion 330. The visible engagement portion of the remaining two functions as a retaining portion 320 including the horizontally elongated hole and the protrusion 30.

1, 2 Electric valve 10 Valve body 12, 14 Piping 20 Can 22 Mounting part 30 Projection (convex part)
50 Stator 52 Lower end surface 60 Cover portion 70 Boss 100, 300 Mounting member 101, 301 Annular body 102, 302 Mounting hole 104, 304 Space 110, 310 Positioning portion 200, 210, 220 Positioning hole 202, 212, 222 Large diameter portion 204 , 214, 224 Small-diameter portion 120 Detachment unit 230 Horizontal elongated hole 320 Detachment unit 330 Detachment unit 331 Leg main body 332 Engaging claw 333 Tail

Claims (7)

A valve body in which a valve seat is formed and containing a valve body that can contact and separate from the valve seat; a cylindrical can that is fixed to the valve body and has a plurality of convex portions on the outside; A stator fitted on the outside of the can, and mounting means provided on the stator and detachably attached to the valve body by engaging with the convex portion of the can. A motor-operated valve that adjusts the flow rate of fluid by driving a rotor, which is rotatably disposed inside, by the stator and moving the valve body toward and away from the valve seat based on the driving of the rotor. ,
The attachment means prevents the stator from coming out in the direction of the rotation axis of the rotor by engaging with a positioning portion having a positioning hole that engages with one of the convex portions and the valve body or the can. A motor-operated valve comprising a retaining portion for performing the operation.   The retaining portion is formed with a retaining hole that engages at least one of the plurality of convex portions excluding the convex portion engaged with the positioning portion in a direction in which the rotor is withdrawn. The motor-operated valve according to claim 1, wherein the motor-operated valve is an engaging portion.   The motor-operated valve according to claim 2, wherein the retaining hole is a horizontally long hole that is long in a direction orthogonal to the rotational axis direction of the rotor.   The electric valve according to claim 1, wherein the retaining portion is at least one engaging arm that engages with a jaw portion of the valve main body provided below the can.   5. The motor-operated valve according to claim 4, wherein each engagement arm includes a pair of engagement claws spaced apart from each other in a direction perpendicular to the rotation axis of the rotor.   The motor-operated valve according to any one of claims 1 to 5, wherein the positioning hole of the positioning portion is formed in a circular shape, an oval shape, a rhombus shape, a tapered cross section, or a burring.   The said positioning part is formed in the recessed part or notch part used as space so that the said convex part may enter into the both sides of the said positioning hole, It is any one of Claims 1-6 characterized by the above-mentioned. Motorized valve.

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