JPH09257144A - Motor operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the pressure equalizing path of a motor operated valve used in a refrigerating cycle or the like. SOLUTION: A motor operated valve has a can 10, and a motor mold is attached to the outside of the can 10. The motor mold has a stator yoke, and a magnet wire is connected to an outside control device through a lead wire. A valve holder 70 integrally formed with a rotor has a hollow part, and holds a valve element 80 inserted into the hollow part so as to be capable of sliding. A bushing 90 fixed to a valve main body has a female screw, and a male screw part 74 of the valve holder 70 is screwed with the female screw. By forming a female screw part 192 of the bushing 90 in a double threaded screw, a path 300 is formed in the screwed part. A valve chamber 42 is communicated with the inside of the can 10 through the path 300.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-operated valve used for controlling a flow rate of a fluid such as a refrigerant used in a refrigeration cycle, and more particularly to a structure of a valve actuating mechanism for performing a screw feeding operation of the motor-operated valve.

[0002]

2. Description of the Related Art A motor-operated valve used in a refrigeration cycle, for example, converts the rotational movement of a stepping motor into a linear movement of a valve body by a screw mechanism to control the flow passage area between the valve body and the orifice of the valve body. Has a configuration. In particular,
A bush having a female screw portion is attached to the valve body, and a male screw portion is provided on a valve body integral with the rotor of the stepping motor or a valve holder supporting the valve body, and the two screw portions are screwed together. This type of motor-operated valve is disclosed in Japanese Patent Application No. 7-21809 by the present applicant.
FIG. 4 is an explanatory view showing a vertical cross-sectional view of the entire configuration of the motor-operated valve filed as the issue, and FIG. 5 is an explanatory view showing the main part thereof.

A motor-operated valve generally designated by reference numeral 1 has a cylindrical can 10 and a stator member 20 fitted on the outer peripheral portion of the can 10. The stator member 20 is made of resin and has a stator yoke 21, a bobbin 24, and
And a stator coil 22 wound around a bobbin 24.
The stator coil 22 is connected via a lead wire 23 to a connector 34 inside a housing 30 attached to the stator member 20. Connector 34 is lead wire 3
It is connected to the control unit via 6. The bobbin 30 is filled with an epoxy resin 32.

The stator member 20 is detachably fitted in the outer peripheral portion of the can 10 in the axial direction, and is attached to the stator member 20 by a screw 28 which is a stopper 28.
Is fixed by A concave groove 11 for receiving the stopper 28 is formed in the outer peripheral portion of the can 10. The lid member 12 is attached to the opening of the can 10 by means such as welding, and the valve body 40 is attached to the opening of the lid member 12 by means such as welding. The valve body 40 is made of, for example, a copper alloy, and has a valve chamber 42, an inlet 43, and an outlet 44.
Having. The outlet 44 forms an orifice that controls the flow rate of the valve.

A pipe 50 on the inlet side is connected to the inlet 43 of the valve body 40 by welding, and the outlet 4 which is an orifice.
A pipe 52 on the outlet side is connected to 4 by welding. A guide bush 90 is inserted into the inner diameter portion of the valve body 40. The guide bush 90 has a female screw portion 92 on the inner diameter portion, and the valve holder 70 having a male screw portion 74 that is screwed into the female screw portion 92 is attached. The valve holder 70 has a tubular shape, and a valve body 80 is slidably inserted in the lower portion. The valve body 80 is constantly urged outward by a coil spring 72 inserted into the hollow portion of the valve holder 70, and the protruding position of the valve body is regulated by a collar 82 which is press-fitted into an inlet portion of the valve holder 70. Is done.

A shaft 64 is disposed above the valve holder 70. A plastic sleeve 60 is integrally formed on the outer periphery of the shaft 64 and the valve holder 70, and a bond magnet 62 which is a plastic magnet is formed on the outer periphery of the plastic sleeve 60. This bonded magnet 62
Functions as a motor rotor. The upper end of the shaft 64 is the bearing member 1 disposed on the back surface of the top of the can 10.
Supported by 4. The coil spring 66 provided on the shaft 64 causes the rotor to rotate and rise together with the valve holder 70, so that if the threaded portion of the coil spring 66 is disengaged, the coil spring 66 is attached to the guide sleeve 90. It is for pressing to the side. The stopper member 77 attached to the upper portion of the guide bush 90 regulates the lower end position of the rotor, is formed of a resin material, and contacts the stopper portion 78 of the sleeve 60. The valve chamber 42 of the valve body 40 communicates with the inside of the can 10 via a passage 46,
The inside of the can 10 and the hollow portion of the valve holder communicate with each other through a hole 73. That is, the passage 46 and the hole 73 are used as a pressure equalizing passage.

In such a structure, the stator coil 22
A stepping motor is constituted by the rotor 62 and the rotor 62, and the rotor that rotates by energization and excitation of the stator coil operates so that the position can be moved in the valve opening / closing direction.
As a result, the flow rate of the refrigerant flowing into the valve chamber 42 of the valve body 40 is controlled by the valve body 80. The opening / closing operation of the valve body 80 for contacting / separating with the orifice is performed by a valve operating mechanism that performs a screw feeding action by the rotation of the rotor. And a valve holder 70 concentrically fixed to the central axis of the rotor 64, having a cylindrical guide bush 90 inserted into the shaft portion and a male screw portion 74 screwed to the female screw portion of the bush. .

[0008]

In the motor-operated valve, however, the valve chamber 42 and the interior of the can 10 are communicated with each other, and the refrigerant or the like in the valve chamber is introduced into the can to equalize the pressure. For this purpose, the passage 46 is machined in the valve body 40. However, there are the following problems when the passage is formed in the valve body by machining. That is, since the passage formed as the pressure equalizing passage in the valve body is arranged on the inner surface of the cylindrical valve body,
Machining must be performed as a separate process for processing the inner surface, which leads to an increase in the number of assembly steps. The present invention has been made in view of such a problem, and the object thereof is to omit the pressure equalizing passage provided in the valve body, realize the pressure equalizing passage with a simple configuration, and reduce the number of assembly steps. It is to provide a reduced motorized valve.

[0009]

[Means for Solving the Problems] To achieve the above object,
A motor-operated valve according to the present invention includes a valve body having a valve chamber and an orifice, a cylindrical can attached to the valve body, a stator member arranged outside the can, and a rotor arranged inside the can. Member and a valve actuating mechanism for moving the valve element toward and away from the orifice by a screw feeding action by the rotation of the rotor member, and the screw of the valve actuating mechanism is formed by a double thread, one of which is the valve chamber. It is characterized in that it is used as a passage for equalizing pressure that communicates with the inside of the can.

Further, the motor-operated valve according to the present invention has a valve main body having a valve chamber and an orifice, a cylindrical can attached to the valve main body, a stator member arranged on the outer side of the can, and an inner side of the can. A rotor member provided, a valve holder integral with the rotor member, a valve body mounted on the valve holder, and a bush fixed to the valve body and screwed into the valve holder. One of the threaded parts is formed by a double thread and the other is formed by a single thread, and one thread of the two thread is used as a pressure equalizing path between the valve chamber and the inside of the can. Characterize.

The motor-operated valve according to the present invention has a valve main body having a valve chamber and an orifice, a cylindrical can attached to the valve main body, a stator member arranged outside the can, and an inner side of the can. A rotor member disposed, a valve holder integral with the rotor member, a valve body slidably inserted into the hollow portion of the valve holder to open and close the orifice of the valve body, and a valve holder fixed to the valve body. The present invention is characterized in that a threaded portion and a bush having a threaded portion are provided, the threaded portion provided on the valve holder is formed by a double thread, and the threaded portion provided on the bush is formed by a single thread.

Furthermore, the motor-operated valve according to the present invention has a valve main body having a valve chamber and an orifice, a cylindrical can attached to the valve main body, a stator member arranged outside the can, and an inner side of the can. A rotor member disposed in the valve member, a valve holder integral with the rotor member, a valve body slidably inserted into a hollow portion of the valve holder to open and close an orifice of the valve body, and a valve holder fixed to the valve body. And a bush having a threaded portion to be screwed with each other, wherein the threaded portion provided on the bush is formed by a double thread and the threaded portion provided on the valve holder is formed by a single thread.

The motor-operated valve of the present invention thus constructed is
A pressure equalizing passage that connects the valve chamber and the inside of the can is formed in a screw mechanism that is a valve actuating mechanism that brings the valve element into and out of contact with the orifice by the rotation of the rotor member inside the can. It is possible to equalize the pressure between the valve chamber and the inside of the can without forming them. In addition, since the passage for equalizing pressure is provided in the screw portion, the refrigerant intervenes in the screw sliding portion, and the lubrication action of the screw portion can be improved.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall structure of an electric valve according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing the main parts thereof. A valve actuating mechanism, which is a screw mechanism, is different from the conventional electric valve shown in FIG. The basic structure is the same except for the pressure equalizing passage formed in the valve body, and the same reference numerals as those in FIG. 4 denote the same parts. A motor-operated valve generally denoted by reference numeral 100 has a cylindrical can 10 and a motor mold 20 fitted around the outer periphery of the can 10. The motor mold 20 is made of resin and has a stator yoke 21, a bobbin 24, and a magnet wire 2 wound around the bobbin 24 therein.
2 is provided. The magnet wire 22 is connected to the connector. The connector is connected to the control device via a lead wire.

The motor mold 20 is detachably fitted in the outer peripheral portion of the can 10 in the axial direction, and is fixed to the motor mold 20 by a stopper 28 attached by a screw 26. A recess 11 for receiving the stopper 28 is formed on the outer peripheral portion of the can 10. The lid member 12 is attached to the opening of the can 10 by means such as welding, and the valve body 40 is attached to the opening of the lid member 12. The valve body 40 is made of, for example, a copper alloy, and has a valve chamber 42, a first port 43, and a second port 44. The second port 44 forms an orifice that controls the flow rate of the valve.

The valve body 40 has a pipe 50 and a pipe 52.
Is connected. A guide bush 90 is inserted into the inner diameter portion of the valve body 40. The guide bush 90 has an internal threaded portion 92, which is a valve actuating mechanism, in its inner diameter portion, and a valve holder 70 having an externally threaded portion 74 screwed into the female threaded portion 92 is mounted. The valve holder 70 has a cylindrical shape having a hollow portion 71, and a valve body 80 is slidably inserted into a lower portion thereof. A disc-shaped washer 2 is provided at the bottom of the hollow portion 71 of the valve holder 70.
Equipped with 20. The valve body 80 is constantly urged in the direction of being pushed outward by the coil spring 72 inserted into the hollow portion 71 via the washer 220.
The protruding position of the valve body is regulated by the collar 82 that is press-fitted into the inlet portion of the valve holder.

The top portion of the valve holder 70 has a structure protruding from the upper surface of the plastic sleeve 60. Valve holder 70
The upper end of the shaft 200 press-fitted into the center of the can is supported by the bearing member 14 disposed on the back surface of the top of the can 10. The lower end of the coil spring 66 disposed on the outer periphery of the shaft 200 is supported by the upper surface of the valve holder 70. The lower end of the shaft 200 projects into the hollow portion 71 of the valve holder 70. The lower end portion 202 of the shaft 200 has an arc at the tip, and the washer 220
Abuts the upper surface of the

The lower surface of the washer 220 is brought into contact with the upper surface of the coil spring 72 arranged between the washer 220 and the valve body 80,
The coil spring 72 always urges the valve body 80 in a direction to push it outward. The valve holder 70 is screwed into a bush 90 fixed to the valve body 40, rotates together with the plastic sleeve 60 and the bond magnet 62 formed outside thereof, and moves in the axial direction by the action of the screw portion.
Other configurations are the same as those of the above-described embodiment, and thus description thereof will be omitted.

A recess 222 is formed on the upper surface of the washer 220 and is fitted in the lower end 202 of the shaft 200. With this configuration, even if the valve body 80 comes into contact with the orifice 44 and rotation is stopped, and the washer 220 rotates together with the coil spring 72, the valve body 80 rotates and slides with the lower end portion 202 of the shaft 200, resulting in malfunctions and the like. Does not occur. The stopper member 77 attached to the upper portion of the bush 90 regulates the lower end position of the rotor and is formed of a resin material.
It abuts the stopper portion 78 of the sleeve 60.

Thus, in this embodiment, the valve body 4
0 does not have a passage serving as a pressure equalizing passage that communicates the valve chamber 42 with the inside of the can 10. The female screw portion 92 of the guide bush 90 and the male screw portion 74 of the valve holder 70, which are the valve operating mechanism, are not formed.
A pressure equalizing path is provided at the screwing portion with. That is, as shown in the cross section of the valve actuating mechanism of this embodiment shown in FIG. 3, the guide bush 90 has a female thread 192 cut into two threads. A male screw 74 on the valve holder 70 side that is screwed into the double thread 192.
Is processed as a single thread. Therefore, when the single-thread male screw 74 and the double-thread female screw 192 are screwed together,
A spiral passage 300 is formed between the screws.

The refrigerant in the valve chamber 42 is filled in the can 10 through the passage 300 as shown by the arrow, and the refrigerant pressures of both can be equalized. Moreover, the passage 300 allows the refrigerant to flow to the threaded portion, and the lubrication action of the threaded portion can be improved. In FIG. 3, 10 and 42 respectively indicate the inside of the can and the valve chamber, and the hole 73 is a pressure equalizing hole that connects the inside of the can and the hollow portion of the valve holder.

Further, in the above-mentioned embodiment, the example in which the double-threaded screw 192 is provided on the guide bush 90 side has been described. However, the screw on the guide bush side is a single-threaded screw, and the male thread on the valve holder 70 side is double-threaded. It may be a screw.

[0023]

As described above, according to the present invention, the rotor member disposed inside the can and the rotary motion of the rotor member are brought into contact with and separated from the orifice by the valve actuating mechanism which is a screw mechanism, and the refrigerant passes through. In a motor-operated valve having a structure for opening and closing an orifice, a screw mechanism is provided with a pressure-equalizing passage for a refrigerant without forming a passage serving as a pressure-equalizing passage communicating between the valve chamber and the can in the valve body. Therefore, it is possible to simultaneously form a passage that becomes a pressure equalizing passage when configuring the screw mechanism, omit machining of the valve main body in which the valve chamber is provided, simplify the structure of the valve main body, and reduce the number of assembly steps. It is possible to realize a motorized valve with reduced

[Brief description of drawings]

FIG. 1 is a sectional view of an electric valve according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the electric valve of FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2;

FIG. 4 is a cross-sectional view of a conventional electric valve.

FIG. 5 is an enlarged sectional view of a main part of FIG. 4;

[Explanation of symbols]

 1 Motorized Valve 10 Can 12 Lid Member 14 Bearing Member 20 Motor Mold 21 Stator Yoke 24 Bobbin 30 Housing 40 Valve Body 42 Valve Chamber 44 Orifice 60 Plastic Sleeve 62 Bond Magnet 70 Valve Holder 71 Hollow Part 72 Coil Spring 74 Male Thread Part 80 Valve Body 90 Bushing 92 Female thread part 300 Passage

Claims (4)

[Claims] 1. A valve body having a valve chamber and an orifice, a cylindrical can attached to the valve body, a stator member arranged outside the can, and a rotor member arranged inside the can. A valve actuation mechanism that brings the valve element into and out of contact with the orifice by a screw feed action due to the rotation of the rotor member, and the screw of the valve actuation mechanism is formed by a double thread, one of which is the valve chamber and the inside of the can. A motor-operated valve characterized in that it is used as a passage for pressure equalization that communicates with each other. 2. A valve main body having a valve chamber and an orifice, a cylindrical can attached to the valve main body, a stator member arranged outside the can, and a rotor member arranged inside the can. The valve holder is integral with the rotor member, the valve body is attached to the valve holder, and the bush is fixed to the valve body and screwed into the valve holder. A motor-operated valve, characterized in that it is formed by a single thread and the other is formed by a single thread, and one thread of the two thread is a pressure equalizing path between the valve chamber and the inside of the can. 3. A valve body having a valve chamber and an orifice, a cylindrical can attached to the valve body, a stator member arranged outside the can, and a rotor member arranged inside the can. A valve holder that is integral with the rotor member, a valve body that is slidably inserted into the hollow portion of the valve holder to open and close the orifice of the valve body, and a screw portion that is fixed to the valve body and screwed with the thread portion of the valve holder. And a bush having
A motor-operated valve, wherein a threaded portion provided on the valve holder is formed by a double thread and a threaded portion provided on the bush is formed by a single thread. 4. A valve main body having a valve chamber and an orifice, a cylindrical can attached to the valve main body, a stator member arranged outside the can, and a rotor member arranged inside the can. A valve holder that is integral with the rotor member, a valve body that is slidably inserted into the hollow portion of the valve holder to open and close the orifice of the valve body, and a screw portion that is fixed to the valve body and screwed with the thread portion of the valve holder. And a bush having
An electrically operated valve, wherein the threaded portion provided on the bush is formed by a double thread and the threaded portion provided on the valve holder is formed by a single thread.