JP5793430B2 - Motorized valve - Google Patents

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.
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, an electric valve according to the present invention includes a valve body having a valve chamber and a valve seat formed therein, a valve body contacting and separating from the valve seat, and an upper portion of the valve body. A can that is fixed, 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 opens the valve body A coil spring biasing in the direction is provided, and the coil spring is a tension spring disposed between the valve body and the valve body.

  In a preferred embodiment, both ends of the coil spring are screwed and attached to thread portions formed on the valve body and the valve body, respectively.

  In another preferred aspect, the coil spring is disposed between a screw bearing fixed to an upper portion of the valve body and the valve body.

  In another preferred embodiment, both ends of the coil spring are screwed and attached to thread portions provided on the screw bearing and the valve body, respectively.

In another preferred embodiment, the threaded portion may be an external threaded portion.
In still another preferred aspect, the coil spring may be a close contact spring.

By providing the above-described means, the motor-operated valve of the present invention can omit the spring case, and a coil spring for biasing the valve body in the valve opening direction from the upper part of the valve body to the actuator side (in other words, the can side). Can be arranged. Accordingly, it is possible to reduce the number of parts and reduce the size of the entire motor-operated valve.
Furthermore, since a spring case is not disposed in the valve chamber, it is possible to reduce 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). The component diagram of the principal part of the motor operated valve of one Example of this invention. FIG. 4 is a detailed view of a main part of FIG. 3.

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 that also serves as a valve chamber 10 a into which a valve body 80 described later is inserted. A first passage 13 is formed on the coaxial line continuously to the inner diameter portion 11. A valve seat 14 is provided at the outlet of the two passages 16.
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. 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 with stage, it 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 into this. 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. The screw shaft 60 and the screw bearing 70 constitute a screw mechanism.

  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. In addition, due to the action of the ball 64, the screw shaft 60 moves up and down while rotating, but the valve body 80 moves up and down without rotating. The fluid in the inner diameter portion 11 is sent into the can 40 through the pressure equalizing hole 17 provided in the valve body 10 to equalize the pressure.

The valve body 80 has a large diameter portion 84 that slides with respect to the inner diameter portion 11, and guides the valve body 80.
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.

FIG. 3 is a component diagram illustrating a mounting structure of the coil spring 90, the screw bearing 70 to which the upper and lower ends of the coil spring 90 are mounted, and the valve body 80.
The coil spring 90 used in the present invention is a so-called contact spring that is in a contact state in a free state.

  The screw bearing 70 has a flange portion 74 inserted into the upper end portion of the valve body 10, and an external thread portion (male thread portion) 76 is provided directly below the flange portion 74 of the cylindrical screw bearing 70. In this example, the screw pitch of the external thread portion 76 is set to be the same as the pitch of the coil spring 90 in the free state. The upper end portion 92 of the coil spring 90 is screwed into the outer screw portion 76 to attach (lock) the upper end portion 92 of the coil spring 90 to the screw bearing 70.

  Similarly, the valve body 80 is also provided with an external threaded portion (male threaded portion) 86 in the upper cylindrical portion of the large diameter portion 84. In this example, the thread pitch of the external thread portion 86 is also set to be the same as the pitch of the coil spring 90 in the free state. The lower end portion 94 of the coil spring 90 is screwed onto the external thread portion 86 to attach (lock) the lower end portion 94 of the coil spring 90 to the valve body 80.

Thus, in the assembled state, the length of the cylindrical portion formed below the flange portion 74 of the screw bearing 70 and the length of the column portion above the large-diameter portion 84 of the valve body 80. Is set to be larger than the total length of the coil spring 90 in the free state, so that the total length of the coil spring 90 is extended by a small amount to generate a tension spring force.
Insert this assembly to the top of the inner diameter portion 11 of the valve body 10 is fixed by caulking portion K _1.

FIG. 4 is an enlarged view of a main part of FIG.
The coil spring 90, in a state of being assembled the screw bearing 70 and the valve body 80 the overall length L ₁ is stretched relative overall length L ₀ of the free state. In this state, a spring force that pulls the valve body 80 toward the screw bearing 70 is generated.

That is, in the free state, the coil spring 90 which is a close contact spring functions as a tension spring, and always biases the valve body 80 in the valve opening direction.
Further, since both ends of the coil spring 90 are screwed and attached to the external screw portions 76 and 86, when the coil spring 90 is pulled, the outer diameter of the coil spring 90 is reduced and the external screw portions 76 and 86 are tightened. Works. Further, as described above, the valve body 80 moves up and down without rotating. Therefore, the coil spring 90 can be attached to the screw bearing 70 and the valve body 80 by a very simple method, while the coil spring 90 is connected to the external thread portions 76 and 86 during the operation of the motor-operated valve 1 (when the valve body 80 is lifted and lowered). There is no risk of detachment.

  In the motor-operated valve of this embodiment, the coil spring 90 is mounted on the outer peripheral portion of the valve body 80, the coil spring 90 is disposed directly on the inner diameter portion 11 of the valve body 10, and the coil spring is connected to the valve body 10 and the valve body 80. The spring case can be omitted. Further, this can reduce pressure loss.

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.

  As described above, in the motor-operated valve of the present invention, since the spring that urges the valve body in the valve opening direction is a tension spring, the tension spring is located on the actuator side (in other words, on the can 40 side) from the upper part of the valve body. Can be arranged. Thereby, the spring case can be omitted, the number of parts can be reduced, the size can be reduced, and the pressure loss can be further reduced.

  In the above description, the thread pitch of the external thread portion 76 formed on the screw bearing 70 and the external thread portion 86 formed on the valve body 80 is set to be the same as the pitch of the coil spring 90 in the free state. However, the present invention is not limited to this, and may be larger than the pitch of the coil springs 90 in a free state.

  In the above description, the coil spring 90 is a close contact spring in the free state. However, the present invention is not limited to this, and may not be in close contact in the free state. In this case, the screw pitch of the external screw portions 76 and 86 may be the same as the pitch of the coil spring 90, but may be larger or smaller than the pitch.

  Furthermore, although it has been described that both ends of the coil spring 90 are attached by screwing to the outer screw part, the present invention is not limited to this, and by screwing to the inner screw part (female screw part). It may be attached. That is, for example, the outer periphery of the flange portion 74 of the screw bearing 70 is extended downward in a cylindrical shape to form an inner screw on its inner wall, and the outer periphery of the large diameter portion 84 of the valve body 80 is extended upward in a cylindrical shape to An inner screw may be formed on the inner wall, and both end portions of the coil spring 90 may be screwed to each inner screw.

  Furthermore, both ends of the coil spring 90 may be supported by any other method without being screwed with the external screw portion or the internal screw portion as described above.

DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Valve body 11 Inner diameter 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 74 Flange part 76 External thread part 80 Valve element 82 Tapered surface 84 Large diameter part 90 Coil spring 94 Lower end part K ₁ Caulking part

Claims (6)

A valve body having a valve chamber and a valve seat formed 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 electric valve according to claim 1, wherein the coil spring is a tension spring disposed between the valve body and the valve body.   The motor-operated valve according to claim 1, wherein both ends of the coil spring are screwed into screw portions formed in the valve body and the valve body, respectively.   The motor-driven valve according to claim 1, wherein the coil spring is disposed between a screw bearing fixed to an upper portion of the valve body and the valve body.   The motor-operated valve according to claim 3, wherein both ends of the coil spring are screwed and attached to threaded portions provided on the screw bearing and the valve body, respectively.   The motor-operated valve according to claim 2, wherein the screw portion is an external screw portion.   The motor-operated valve according to claim 1, wherein the coil spring is a contact spring.

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