JP2013137041A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve miniaturization and weight saving by reducing constituent members of a motor-operated valve.SOLUTION: A valve element 80 is slidably arranged inside a valve body 10 of a motor-operated valve 1, and is pressed in a valve closing direction by a screw feed mechanism of a screw shaft 60. A coil spring 90 equipped between an inner diameter part 11 of the valve body 10 and the valve element 80 presses the valve element 80 in a valve opening direction. The coil spring 90 is directly arranged inside the inner diameter part 11. Thereby, the number of components is reduced, and the motor-operated valve having the same capacity is miniaturized.

Description

  The present invention relates to a motor-operated valve used to control the flow rate of refrigerant in an air conditioner, for example.

  The following Patent Document 1 shows an electric valve used by being incorporated in this type of air conditioner, refrigerator, etc., and has a function of adjusting the flow rate of a fluid such as a refrigerant. And a bottomed cylindrical can fixed to the upper part of the valve body. A rotor is built inside the can, and a stator having an insertion hole in the center is fitted outside the can.

The rotational output of the rotor is decelerated by the reduction mechanism and transmitted to the screw shaft. The screw rod is screwed into a screw bearing fixed to the upper part of the valve body, and the screw shaft moves in the axial direction by a screw mechanism.
The movement of the screw shaft is transmitted to the valve body, and the valve body opens and closes with a valve seat formed in the valve body to control the flow rate.

The valve body is always urged in the valve opening direction by a coil spring and is always in contact with the screw shaft.
The rod-shaped valve body is slidably inserted into a cylindrical spring case provided in the valve chamber.
The spring case has a two-stage cylindrical shape in which the upper portion has a large diameter portion and the lower portion has a small diameter portion, and the valve body is guided by the lower diameter portion. The coil spring is inserted into the large diameter portion of the spring case. The upper end portion of the coil spring is in contact with the upper flange portion of the valve body, and the lower end portion is in contact with the bottom portion of the large diameter portion of the spring case.
The coil spring is a compression spring and constantly biases the valve body in the valve opening direction.

JP 2008-275120 A

In the conventional electric valve described above, since the spring case surrounds the outer periphery of the valve body, the diameter of the valve body needs to be large to accommodate the spring case. For this reason, it has been difficult to reduce the size of the entire motor-operated valve.
Moreover, since the spring case is arranged in the valve chamber, there is a concern that the pressure loss increases.
Accordingly, an object of the present invention is to provide an electric valve that can omit a spring case.

In order to achieve the above object, the motor-operated valve of the present invention is fixed to a valve body having a valve chamber and a valve seat therein, a valve body that contacts and separates from the valve seat, and an upper portion of the valve body. A can, a rotor that is rotatably provided inside the can, a stator that is provided outside the can, a screw mechanism that is driven by the rotor to operate the valve body, and the valve body is attached in the valve opening direction. The coil spring is disposed between the inner diameter portion of the valve main body and the outer diameter portion of the valve body.
In a preferred embodiment, the valve body includes a guide portion of the valve body formed on the same axis as the inner diameter portion in the upper portion of the valve chamber.
In a preferred embodiment, the coil spring is contracted between a flange portion formed on an upper portion of the valve body and the guide portion.
In a further preferred aspect, a speed reduction mechanism is disposed between the rotor and the screw mechanism.

  By providing the above-described means, the motor-operated valve according to the present invention can reduce the number of parts by omitting the spring case, thereby reducing the size of the motor-operated valve as a whole and reducing pressure loss.

Sectional drawing which shows the motor operated valve of one Example of this invention abbreviate | omitting a stator (valve closed state). Sectional drawing which abbreviate | omits a stator and shows the motor operated valve of one Example of this invention (valve open state).

FIG. 1 is a cross-sectional view showing a motor-operated valve according to an embodiment of the present invention with a stator omitted.
The motor-operated valve 1 shown without a stator has a cylindrical valve body 10. The valve body 10 includes an inner diameter portion 11 into which a later-described valve body 80 is inserted, and a valve body guide portion 12 is formed continuously below the inner diameter portion 11. Moreover, the valve body guide part 12 is formed in the upper part of the valve chamber 10a. A first passage 13 is formed coaxially with the inner diameter portion 11 and the valve element guide portion 12 on the lower surface of the valve chamber 10a, and a valve seat 14 is provided at the outlet of the first passage 13 on the second passage 16 side. .
A pipe 20 and a pipe 22 are connected to the first passage 13 and the second passage 16 provided on the side surface of the valve body 10 so as to be orthogonal thereto. In this example, the second passage 16 is a portion in which the valve chamber 16 a is opened to the side surface of the valve body 10. Fluid (refrigerant) flows into the motor-operated valve 1 from the first passage 13 or the second passage 16, and fluid flows out from the second passage 16 or the first passage 13.

A disc-shaped mounting substrate 30 is fixed to the upper portion of the valve body 10, and a cylindrical can 40 is attached to the upper portion of the mounting substrate 30. The stator (not shown) shown in the conventional example is provided on the outer periphery of the can 40.
A rotor 50 is rotatably mounted inside the can 40 via a shaft 51. The rotational force of the rotor 50 is decelerated by the deceleration mechanism 52 and transmitted to the output shaft 54. In this example, the speed reduction mechanism 52 is a mysterious planetary gear mechanism. The output shaft 54 has a flat groove 55, and a flat plate 61 of the screw shaft 60 is inserted into the flat groove 55, and the screw shaft 60 is rotated by receiving the rotational force of the output shaft 54.

The upper portion of the valve body 10 is inserted a cylindrical screw bearing 70 is fixed to the valve body 10 by caulking portion K _1. The screw bearing 70 has a female screw portion 72, and the male screw portion 62 of the screw shaft 60 is screwed together. When the screw shaft 60 is rotationally driven by the output shaft 54, the screw shaft 60 moves in the axial direction, and this movement is transmitted to the ball receiver 66 supported on the top of the valve body 80 via the ball 64.

  Since the ball receiver 66 is supported by the valve body 80, the valve body 80 moves in the axial direction by the movement of the screw shaft 60, and the taper surface 82 opens and closes the fluid passage between the valve seat 14 and the valve function. Demonstrate. The fluid that has passed through the valve body guide portion 12 is sent into the can 40 through the pressure equalizing hole 17 provided in the valve main body 10 to achieve pressure equalization.

  Since the screw shaft 60 does not have a function of pulling up the valve body 80 in the valve opening direction, a coil spring 90 is provided to urge the valve body 80 in the valve opening direction. In the electric valve according to the present invention, the coil spring 90 is disposed directly on the inner diameter portion 11 of the valve body 10 and the spring case is omitted.

That is, the lower end surface of the coil spring 90 is brought into contact with the bottom portion (upper surface of the valve body guide portion 12) 11a of the inner diameter portion 11, and the upper end surface of the coil spring 90 is brought into contact with the lower surface of the flange portion 84 provided on the top portion of the valve body 80. Let The flange portion 84 may be formed over the entire circumference of the valve body 80 or may be provided partially around the circumference.
Since the coil spring 90 always generates a spring force in the direction in which the entire length extends, the valve body 80 is always urged in the valve opening direction.

In the motor-operated valve of this embodiment, the coil spring 90 is mounted on the outer peripheral portion of the valve body 80 and directly disposed on the inner diameter portion 11 of the valve body 10, so that the spring case can be omitted.
The outer diameter dimension of the valve body 80 is determined by the capacity of the valve for which an electric valve is required.
Therefore, it is possible to design the outer diameter of the valve body 10 to be small with respect to the valve body 80 that requires the same capacity. Further, since the spring case is not disposed in the valve chamber 10a, the pressure loss can be reduced. Furthermore, since the speed reduction mechanism 52 is disposed between the rotor 50 and the screw mechanism (the screw shaft 60 and the screw bearing 70), the torque of the output shaft 54 becomes large and the motor-operated valve is configured to handle a large flow rate. Even if it is done, the drive of the valve body 80 can be performed easily.
As described above, in the motor-operated valve 1 of the present invention, the number of parts can be reduced, and downsizing and pressure loss can be reduced.

DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Valve body 11 Inner diameter part 12 Valve body guide part 13 1st channel | path 14 Valve seat 16 2nd channel | path 17 Pressure equalization hole 20 Piping 22 Piping 30 Mounting board 40 Can 50 Rotor 51 Shaft 52 Deceleration mechanism 54 Output shaft 55 Flat groove 60 Screw shaft 61 Flat plate 62 Male thread part 64 Ball 66 Ball receiver 70 Screw bearing 72 Female thread part 80 Valve element 82 Taper surface 84 Flange part 90 Coil spring K ₁ Caulking part

Claims (4)

A valve body having a valve chamber and a valve seat therein;
A valve body that contacts and separates from the valve seat;
A can fixed to the top of the valve body;
A rotor mounted rotatably inside the can,
A stator equipped outside the can,
A screw mechanism that is driven by a rotor to operate the valve body;
A coil spring for urging the valve body in the valve opening direction,
The motor-operated valve, wherein the coil spring is disposed between an inner diameter portion of a valve body and an outer diameter portion of the valve body.   2. The motor-operated valve according to claim 1, wherein the valve body includes a guide portion of the valve body that is formed coaxially with the inner diameter portion in an upper portion of the valve chamber.   The motor-operated valve according to claim 1, wherein the coil spring is contracted between a flange portion formed on an upper portion of the valve body and the guide portion.   The motor-operated valve according to any one of claims 1 to 3, wherein a speed reduction mechanism is disposed between the rotor and the screw mechanism.

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