JP2011153632A - Mounting device of coil unit of motor operated valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an assembling defective of a motor operated valve constituted by assembling a separate coil unit to a can integrated into a valve main body. <P>SOLUTION: The cylindrical can 20 equipped with a rotor therein is integrally fixed to an upper part of the valve main body 10 including a valve chamber, etc. A hemispherical projection 30 is formed in an outer peripheral part of the can 20. The coil unit 50 having a coil bobbin covered with plastic includes a boss 70. A mounting member 100 made of a metal plate is fixed by using a hole 102. A hole 112 is formed in a mounting part 110, of leg-shaped mounting parts 110 and 120 having elasticity. The hole 112 has a shape to be automatically aligned between the hole 112 and the projection 30 during assembling. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coil unit fixing device in a motor-operated valve in which a coil unit is detachably mounted on the outer periphery of a valve body.

This type of electric valve is equipped with a rotor inside a cylindrical member called a can made of a non-magnetic metal, and constitutes a stepping motor in combination with a coil unit that is detachably attached to the outer periphery of the can. .
The rotor rotation is decelerated by a gear mechanism as necessary, and then converted into a linear motion by a screw mechanism to control the valve opening degree disposed in the valve body.
The following patent document discloses in detail the structure of this type of motor-operated valve.

JP 2006-226369 A

  The coil unit that is detachably mounted on the valve body side has a donut shape that is fitted to the outer periphery of a cylindrical can, and has three elastic attachment portions (plate-like members) after being fitted to the can. It is fixed to the valve main body side using the attachment member provided with.

The coil unit is configured such that four attachment postures can be selected on the circumference with respect to the can. In this configuration, when the motor-operated valve is arranged during the refrigeration cycle, the coil unit mounting posture can be selected to be the optimum posture with respect to the counterpart device.
Specifically, a hole formed by punching or the like formed on one of the three mounting portions provided on the coil unit side with respect to the four protrusions formed on the outer peripheral portion of the can. The coil unit is fixed to the electric valve body side by fitting. Since the coil unit must be accurately positioned and fixed with respect to the can of the motor-operated valve body, the diameter of the hole formed in the mounting part is slightly larger than the diameter of the lowest part of the protrusion formed on the outer peripheral part of the can. It is formed small. As a result, the mounting portion in which the hole is formed presses the can through the protrusion, and the mounting portion in which the hole is not formed directly presses the can, so that the coil unit is correctly positioned and fixed with respect to the can. The
However, alignment for the fitting is difficult, and there is a risk of poor mounting.

  An object of the present invention is to provide an attachment device that facilitates the above-described fitting and prevents the attachment failure when the coil unit is assembled to the valve body.

In order to achieve the above-described object of the present invention, an electric valve of the present invention includes a valve chamber, a valve seat communicating with the valve chamber, a valve body including a valve body that is separated from and in contact with the valve seat, and a valve body. A cylindrical can made of a nonmagnetic metal material to be fixed, a rotor rotatably disposed inside the can, a mechanism for converting the rotational motion of the rotor into a linear motion and transmitting it to the valve body, and a cylinder A mounting unit for fixing the coil unit to the can, a plurality of protrusions projecting to the outside of the can, and a plurality of elastic members fixed to the coil unit. A mounting portion is provided, and one mounting portion of the plurality of mounting portions has a hole that engages with the protrusion of the can, and the hole has an automatic alignment function that automatically guides the protrusion to the center of the hole. is there.
And the hole formed in an attaching part is an egg-shaped hole which has a longitudinal direction in the axial direction of a coil unit, or a rhombus which has a longitudinal direction in the axial direction of a coil unit.
Further, the hole formed in the attachment portion is a tapered hole having a large diameter portion in a direction engaging with the protrusion, or a hole formed by burring by inserting a tool from the direction engaging with the protrusion. It can also be.

  The motor-operated valve of the present invention has the above-described configuration, so that when the coil unit and the valve body side are assembled, the positions of the holes and protrusions of the mounting portion are automatically aligned, and the positioning is easy, and the assembly failure is Is prevented.

Explanatory drawing which shows the external appearance of the motor operated valve of this invention. Explanatory drawing which shows the assembly components of the valve main body 10 and the can 20. FIG. The external view of the coil unit 50. FIG. The perspective view which shows the state which decomposed | disassembled the motor operated valve into the main-body part and the coil unit. The perspective view which shows the state which decomposed | disassembled the coil unit 50 and the attachment member 100. FIG. Explanatory drawing which shows the relationship between the hole 112 of the conventional attaching part 110, and the protrusion 30 of the can side. Explanatory drawing which shows the Example of this invention. Explanatory drawing explaining the other Example of this invention. Explanatory drawing explaining further another Example of this invention. Explanatory drawing explaining further another Example of this invention. Explanatory drawing explaining further another Example of this invention. Explanatory drawing explaining further another Example of this invention.

FIG. 1 is an explanatory view showing the appearance of the motor-operated valve of the present invention.
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.
A valve chamber and a valve seat are provided in the valve body 10. 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 is rotatably mounted in the can 20. The rotation of the rotor is converted into a linear motion by a screw mechanism, and the valve body facing the valve seat is operated.
By controlling the position of the valve body with respect to the valve seat, the flow rate of the refrigerant or the like passing through the valve is controlled.

A coil unit 50 is detachably mounted on the outer periphery of the can 20. In the coil unit 50, a bobbin around which an electric wire is wound is disposed and integrated with a synthetic resin. A cover portion 60 that houses a terminal is provided on one side of the coil unit, and is connected to an external power feeding side by a lead wire 62.
The coil unit outside the can and the rotor inside the can constitute a stepping motor, and the rotor is rotated by a predetermined angle by a pulse fed to the coil unit side.
The valve body 10 to which the can 20 is fixed is supplied as a unit component, and the motor-operated valve 1 is completed by assembling the coil unit 50.

FIG. 2 shows assembly parts of the valve body 10 and the can 20, and FIG. 3 shows an external view of the coil unit 50.
The can 20 is fixed to the valve body 10 via the mounting member 22.
For example, four protrusions 30 are formed on the circumference in the vicinity of the attachment member 22 of the cylindrical can 20. The protrusion 30 is formed by processing the can 20 from the inside of the can 20 using a tool such as a punch or a press. The protrusion 30 is formed in a hemispherical shape, or its longitudinal cross-sectional shape draws a part of a circle or an ellipse, or other curved surface. .
The coil unit 50 is a member that covers a coil bobbin with a synthetic resin, and has a plurality of resin-made bosses 70 at the lower part. The metal mounting member 100 is fitted to the boss 70, and the boss 70 is welded to the mounting member 100 to integrate the mounting member 100.
The attachment member 100 is made of a metal plate having elasticity, and for example, three attachment portions are formed by bending.
Of the three attachment portions, one attachment portion 110 has a hole for attachment, and the other two attachment portions 120 do not have a hole, and press the outer periphery of the can 20 by elasticity. Thus, the coil unit 50 is securely fixed to the outer peripheral portion of the can 20.

FIG. 4 is a perspective view showing a state in which the electric valve is disassembled into a main body portion and a coil unit.
As described above, for example, four protrusions 30 are formed on the circumference of the can 20 fixed to the valve body 10 with the attachment portion 22 on the circumference, for example, at equal intervals. .
The coil unit 50 has a structure in which a coil bobbin is sealed inside a synthetic resin, and the inside is fitted to the outer peripheral portion of the can 20. Although the coil unit has a donut shape, a cover portion 60 for accommodating a terminal for receiving power supply projects outside.
A plurality of columnar bosses 70 protruding in the axial direction are provided on the lower surface of the coil unit 50.

The attachment member 100 is made of an elastic metal plate and includes a plurality of holes that fit into the boss 70. The mounting member 100 fits this hole into the boss 70, processes the boss by means such as welding, and fixes the mounting member 100 to the coil unit 50.
The attachment member 100 has three attachment portions 110 and 120 formed by bending a metal plate. One of the mounting portions 110 is formed with a hole 112 that engages with the protrusion 30 of the can 20. The other two attachment portions 120 do not include a hole that engages with the protrusion, and have a function of securely fixing the coil unit 50 to the can 20 by its elasticity.

FIG. 5 is a perspective view showing a state where the coil unit 50 and the mounting member 100 are disassembled.
The attachment member 100 is a disk-shaped member having a space 104 inserted into the outer peripheral portion of the can 20 on the inside, and has a plurality of attachment holes 102 that engage with the bosses 70 of the coil unit 50.
One of the three mounting portions 110, 120 formed by cutting and bending the metal plate constituting the mounting member has a hole 112 that engages with the projection of the can. The other two attachment portions 120 have a function of securely fixing the coil unit to the can without being provided with a hole.

FIG. 6 is an explanatory view showing the relationship between the hole 112 of the conventional mounting portion 110 and the projection 30 on the can side.
As shown in FIG. 6A, the conventional mounting portion 110 has a round hole 112 formed by punching or the like. That is, the round hole 112 is formed such that its inner wall surface is perpendicular to the surface of the mounting portion 110.
When assembling the coil unit 50 and the can 30, after the coil unit is fitted to the outside of the can, the coil unit is pivoted to engage the hole 112 of the mounting portion 110 with the protrusion 30.
If the axial position of the coil unit and the can is in a predetermined position during the assembly, the hole 112 of the mounting portion 110 is accurately engaged with the protrusion 30 of the can as shown in FIG. Is done.

However, if the axial position between the coil unit and the can is shorter than the predetermined position, the hole 112 of the mounting portion 110 and the protrusion 30 do not engage correctly as shown in FIG.
Similarly, if the axial position between the coil unit and the can is longer than a predetermined position, the hole 112 and the protrusion 30 of the mounting portion 110 do not engage correctly as shown in FIG.
Therefore, the above engaging operation is troublesome, and if the hole 112 of the mounting portion 110 and the can protrusion 30 are not correctly engaged during assembly, the coil unit and the valve main body are not firmly fixed, and the stepping motor operates. It causes a failure and the function of the motor-operated valve is impaired.
The attachment device of the present invention provides an attachment member that eliminates the above-described problems.

FIG. 7 is an explanatory view showing an embodiment of the present invention.
The attachment device of the present invention has an attachment member 100 that is fixed to the lower surface of the coil unit 50 as in the conventional case. The attachment member 100 includes an attachment portion 110 that functions as an engagement leg engaged with the protrusion 30 on the can side, and two attachment portions 120 (FIGS. 4 and 5) having a function of simply pressing the can, for example. The mounting portion 110 has an egg-shaped hole 200 as shown in FIG. The hole 200 is formed in an egg shape in which the upper part on the coil unit 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 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. Furthermore, in this embodiment, the hole 200 is formed, for example, by punching using 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. 7B, the apex of the protrusion 30 is inserted into the entrance of the egg-shaped hole 200 even if the positions of the hole 200 and the protrusion 30 in the height direction do not match during assembly. If possible, the protrusion 30 is guided to the center part of the egg-shaped hole 200 (center part of the large diameter part 202) by the elasticity of the mounting part and automatically aligned. Thereby, the protrusion 30 is engaged with the large diameter portion 202, and the coil unit 50 is attached to the accurate position of the can 20.

FIG. 8 is an explanatory view for explaining another embodiment of the present invention.
In the embodiment shown in FIG. 8A, the hole 210 formed in the mounting portion 110 is an inverted egg-shaped hole 210 formed in the large diameter portion 212 on the upper side and in the small diameter portion 214 on the lower side. It has the shape of
In this example, the egg-shaped hole 200 shown in FIG. 7 is turned upside down, and the center of the large-diameter portion 212 having a circular outline is set at a position where the protrusion 30 should be positioned. The function of the inverted egg-shaped hole 210 is the same as that described with reference to FIG.
In the embodiment shown in FIG. 8B, the diamond-shaped hole 220 has the functions of the embodiment shown in FIG. 7 and the embodiment shown in FIG. A circular small-diameter portion 224 is provided above and below the portion 222, and they are connected by a straight line. That is, the hole 220 has a rhombus 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 hole 220 (center of the large diameter portion 222) and automatically aligned.

FIG. 9 is an explanatory view showing still another embodiment of the present invention.
In the present embodiment, the hole 300 formed in the mounting portion 110 has a large circle on the surface (surface) facing the protrusion 30 as shown in FIGS. 9A and 9B. It is formed in a tapered shape (inclined) so that the circle on the opposite surface (back surface) becomes smaller. If the tip of the projection 30 can be positioned within the surface of the hole 300 by the action of the taper surface, the projection 30 is guided so that its center is located at the center of the hole 300 and automatically aligned. The
In addition, by appropriately setting the inclination angle of the tapered surface and the curved surface of the protrusion 30, the contact portion between the tapered surface and the protrusion 30 is not at the front end of the hole 300 but at a position moved from the front surface to the back surface side. The diameter of the circle on the surface of the hole 300 can be increased by this amount as compared with the case where the hole is formed by punching. Thereby, the protrusion 30 can be inserted into the hole 300 more easily.

FIG. 10 is an explanatory view showing still another embodiment of the present invention.
In the present embodiment, the hole 400 formed in the attachment portion 110 is formed by burring processing in which a tool is press-fitted into the attachment portion 110 from the side where the protrusion 30 is inserted.
By this burring process, a cylindrical protrusion 410 is formed on the back side of the mounting portion 110, and an R surface 412 is formed around the front side of the hole 400.
If the tip of the protrusion 30 can be positioned inside the hole 400 by the action of the R surface 412, the protrusion 30 is guided so that its center is positioned at the center of the hole 400 and automatically aligned.
Also in this example, as in the example shown in FIG. 9, the diameter of the outermost peripheral portion of the hole 400 on the side facing the protrusion 30 can be made larger than when the hole is formed by punching. As a result, the insertion of the protrusion 30 into the hole 400 is further facilitated.

FIG. 11 is an explanatory view for explaining still another embodiment of the present invention.
In this embodiment, the mounting portion 110 obtained by bending the elastic metal plate that engages with the protrusion 30 of the mounting member 100 into a leg shape includes a round hole 112 at the center. Then, on both side surfaces of the mounting portion 110, a dent portion 500 is provided as a guiding means for guiding the protrusion 30 to the center of the round hole 112.
The indented portion 500 can be formed by forming deformed portions 510 on both sides of the mounting portion 110 made of an elastic metal plate by pressing.

FIG. 12 is an explanatory view for explaining still another embodiment of the present invention.
In the present embodiment, the mounting portion 110 of the mounting member 100 includes a round hole 112 at the center. Further, on both side surfaces of the mounting portion 110, notches 600 that are guide means for guiding the protrusion 30 to the center of the round hole 112 are provided.
The notch 600 can be formed at the same time as the mounting portion 110 is cut out.
By providing this guide means, even if it is the protrusion 30 approaching from any side surface of the both sides of the attachment part, it can guide to the center of the round hole 112, and a reliable engagement is achieved.
11 and 12, the round hole 112 is formed by punching. However, as shown in FIGS. 7 to 10, the round hole 112 is a hole formed by an egg shape, a diamond shape, a taper shape, or a burring process. May be.

  In the motor-operated valve of the present invention, when assembling the pre-configured valve main body and the coil unit side, the projection is formed on the can of the valve main body and is fitted to the position of the hole in the mounting portion on the coil unit side. Guided as possible and assured assembly is achieved.

DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Valve body 20 Can 30 Protrusion 50 Coil unit 60 Cover part 70 Boss 100 Attachment member 110 Attachment part 112 Round hole 120 Attachment part 200 Egg-shaped hole 300 Rhombus hole 400 Burring hole 500 Recessed part 600 Notch

Claims (8)

A valve body, a valve seat communicating with the valve chamber, a valve body having a valve body that is separated from and contacting the valve seat, a cylindrical can made of a nonmagnetic metal material fixed to the valve body, and the interior of the can And a coil unit that is detachably attached to the outer side of the cylindrical can. There,
The attachment device for fixing the coil unit to the can includes a protrusion protruding outward from the can and a plurality of attachment portions having elasticity fixed to the coil unit, and one attachment portion of the plurality of attachment portions is a portion of the can. A mounting device for a coil unit of an electric valve having a hole for engaging with a protrusion and having an automatic alignment function for automatically guiding the protrusion to the center of the hole.   The apparatus for mounting a coil unit of an electric valve according to claim 1, wherein the hole formed in the mounting part is an egg-shaped hole having a longitudinal direction in the axial direction of the coil unit.   The apparatus for mounting a coil unit of a motor-operated valve according to claim 1, wherein the hole formed in the mounting portion is a diamond-shaped hole having a longitudinal direction in the axial direction of the coil unit.   The mounting device for a coil unit of a motor-operated valve according to claim 1, wherein the hole formed in the mounting portion is a tapered hole having a large-diameter portion in a direction engaging with the protrusion.   The mounting unit for the motor-operated valve coil unit according to claim 1, wherein the hole formed in the mounting part is a hole formed by burring by inserting a tool from a direction engaging with the protrusion. A valve body, a valve seat communicating with the valve chamber, a valve body having a valve body that is separated from and contacting the valve seat, a cylindrical can made of a nonmagnetic metal material fixed to the valve body, and the interior of the can And a coil unit that is detachably attached to the outer side of the cylindrical can. There,
The attachment device for fixing the coil unit to the can includes a protrusion protruding outside the can and a plurality of attachment portions having elasticity fixed to the coil unit,
One mounting portion of the plurality of mounting portions is a mounting device for a coil unit of an electric valve provided with a hole engaging with a projection of a can and guide means provided in the vicinity of the hole.   The apparatus for mounting a coil unit of an electric valve according to claim 6, wherein the guide means is a notch provided on a side surface of the mounting portion.   The apparatus for mounting a coil unit of an electric valve according to claim 6, wherein the guide means is a dent portion provided on a side surface of the mounting portion.

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