JP2003004160A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of noise in the passing of a fluid such as a refrigerant in a motor-operated valve. SOLUTION: This motor-operated valve is provided with a valve body 80 for adjusting the passing flow by a valve element 50 contacting and separating from a valve seat 82 by a valve stem 51; a can 20 stuck to the valve body 80 and containing a rotor 40 for contacting and separating the valve element 50 from the valve seat 82; and a stator fitted to the outside of the can 20 and rotationally driving the rotor 40. An orifice formed in the valve seat 82 is composed of a valve element receiving taper part 83 enlarged to open onto the valve chamber 81 side, a cylinder part with an almost uniform diameter, and an inflow taper part 85 enlarged to open to a fluid inflow pipe 2. The fluid flow direction length of the cylinder part 84 is set to about 0.3 mm. The opening angle of the inflow taper part 85 is set to about 20 deg. to a fluid flow axis. The diameter of the valve chamber 81 in the upper position of the valve seat 82 is set to about 4.3 mm.

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 that is used by being incorporated in an air conditioner, a refrigerator, etc., and more particularly to a motor-operated valve that suppresses noise that tends to occur during operation.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a motor-operated valve used by being incorporated in a refrigeration cycle of an air conditioner, a refrigerator or the like according to the prior art. The motor-operated valve 1 includes a valve body 10 and a can 20.
And a stator (unsigned). Then, the valve body 10 adjusts the passage flow rate of the refrigerant between the fluid inflow / outflow pipes 2 and 3 by the valve body 50 that comes into contact with and separates from the valve seat 12 in the valve chamber 11, and the can 20 is fixed to the valve body 10. The rotor 40 for bringing the valve body 50 into and out of contact with the rotor 40 is built in. Also, the stator is
It is fitted onto the can 20 and drives the rotor 40 to rotate. The rotor 40 and the stator constitute a stepping motor. The above configuration will be described in more detail.
Has a bottomed cylindrical shape formed of non-magnetic metal such as stainless steel, and is fixed by welding or the like through a collar plate 16 that is fixed to the upper portion of the valve body 10 by welding. Is kept at.

The stator is composed of a yoke made of a magnetic material and a stator coil wound around the yoke via a bobbin, and has a fitting hole to be fitted on the can 20. The valve body 50 is formed at the lower end of the valve shaft 51. The drive mechanism for bringing the valve body 50 into and out of contact with the valve seat 12 formed in the valve body 10 includes a cylindrical guide bush 60 having a fixing screw portion 61 and a moving screw portion screwed into the fixing screw portion 61. And a valve shaft holder 70 having a screw feed mechanism 71.
It is arranged at a substantially central portion of the entire length in the axial direction.

Further, as shown in FIG. 4, an orifice is formed in the valve seat 12, and the orifice has a valve body receiving taper portion 83 which expands and opens toward the valve chamber 11 side, and a cylindrical portion 8 having a substantially uniform diameter.
4, the length of the tubular portion 84 in the fluid flow direction is about 1.6 mm, and the tubular portion 84 has a substantially uniform diameter. By the way, the motor-operated valve 1 may generate noise, which is the passing sound of the refrigerant, due to the built-in refrigeration cycle. Efforts have been made to eliminate this noise from the past, but the result of sufficient noise reduction has not been obtained.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to suppress noise when a fluid such as a refrigerant passes through the motor-operated valve.

[0006]

The present inventors measured the noise generated by variously changing the gap and shape between the orifice and the valve body. As a result, the following results were obtained, and the measurement result was that the noise generation was small. That is,
The motor-operated valve according to claim 1, wherein a valve body that adjusts a passing flow rate by a valve body that contacts and separates from a valve seat in a valve chamber by a valve shaft, and a rotor that is fixed to the valve body and moves the valve body toward and away from the valve seat. In a motor-operated valve that includes a can that accommodates the can and a stator that is externally fitted to the can and that drives the rotor to rotate, an orifice formed in a valve seat is enlarged to open in the valve chamber side, and a valve body receiving taper portion is provided. , A tubular portion having a substantially uniform diameter and an inflow taper portion that expands and opens toward the pipe side. The length of the tubular portion in the fluid flow direction is about 0.3 mm, and the opening angle of the inflow taper portion is It is characterized in that it is about 20 degrees with respect to the fluid flow direction.

According to a second aspect of the invention, in the above-mentioned means, the diameter of the valve chamber at the upper position of the valve seat is about 4.3 mm. A motor-operated valve according to a third aspect of the invention is characterized in that, in any one of the above means, the fluid inflow pipe connected to the motor-operated valve does not have a portion having a small diameter in the flow direction. The motor-operated valve according to claim 4 is characterized in that, in any one of the above-mentioned means, a step portion is formed so that a horizontal sectional area of a portion of the valve body in the axial direction of the valve body is smaller on the valve seat side. To do.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a motor-operated valve according to an embodiment of the present invention, and FIG. 2 is an explanatory view of a main part of the motor-operated valve. Figure 1
3, the members having the same configurations as those in FIG. 3 showing the prior art are designated by the same reference numerals. The orifice formed in the valve seat 82 of the valve body 80 in the present embodiment is, as shown in FIG.
It is composed of a valve body receiving taper portion 83 that expands and opens toward the valve chamber 81 side, a cylindrical portion 84 that has a substantially uniform diameter, and an inflow taper portion 85 that expands and opens toward the fluid inflow pipe 2 side. The length in the fluid flow direction is set to about 0.3 mm, and the opening angle of the inflow taper portion 85 is set to about 20 degrees. It was also found that the noise was significantly reduced when the refrigerant was passed through the motor-operated valve of the above embodiment. According to the result of the experiment, it was found that the sound pressure of the generated noise was less than half that of the conventional product, and the generation time was continuous to instantaneous.

In addition to the above structure, the diameter of the valve chamber 81 at the upper position of the valve seat 82 is changed from the conventional 5.0 mm to 4.3.
It was found that the noise was further reduced by setting the thickness to about mm. Furthermore, in the present invention, as another embodiment,
In addition to the above means, the inner diameter of one or both of the fluid inflow / outflow pipes 2 and 3 of the motor-operated valve is made substantially the same as the inner diameter of the pipe continuous to the fluid inflow / outflow pipes 2 and 3, and the diameter of the continuous inner diameter portion is increased. The effect of noise suppression is obtained by not forming a small number of parts.
FIG. 1 shows a case where the inner diameter of the fluid inflow pipe 2 and the inner diameter of the pipe 4 are made substantially the same when the fluid inflow pipe 2 is expanded and the pipe 4 is connected to the connection point 5. Of course, when connecting the pipe 4 to the fluid outflow pipe 3, the same configuration as that of the fluid inflow pipe 2 may be adopted. Further, as another embodiment of the present invention, the valve body 50 forming the valve motor-operated valve is configured such that the water side cross-sectional area inside the valve chamber 81 in the axial direction of the valve body 50 is reduced by forming a stepped portion on the toilet seat 82 side. The effect of suppression is obtained.

[0010]

As described above, according to the motor-operated valve of the present invention, it is possible to significantly reduce the noise caused by the fluid control.

[Brief description of drawings]

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

FIG. 2 is an explanatory view of a main part of the same motorized valve.

FIG. 3 is a longitudinal sectional view of a main part of a motor-operated valve according to a conventional technique.

FIG. 4 is an explanatory view of a main part of an electric valve according to the related art.

[Explanation of symbols]

1 ... Motorized valve 2 ... Fluid inflow pipe 3 ... Fluid outflow pipe 4 ... Piping 5 ... Connection point 10 ... Valve body 11 ... Valve chamber 12 ... Valve seat (conventional) 16 ..Brim plate 20..can 40..rotor 50..valve 51..valve shaft 5
1a ... Step 60 ... Guide bush 61 ... Fixing screw 7
0 ... Valve shaft holder 71 ... Movement screw part 80 ... Valve body 8
1..Valve chamber 82..valve seat (present invention) 83..valve body receiving taper portion 84..cylindrical portion 85..inflow taper portion

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[Procedure amendment]

[Submission date] June 25, 2001 (2001.6.2)
5)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

In addition to the above structure, the diameter of the valve chamber 81 at the upper position of the valve seat 82 is changed from the conventional 5.0 mm to 4.3.
It was found that the noise was further reduced by setting the thickness to about mm. Furthermore, in the present invention, as another embodiment,
In addition to the above means, the inner diameter of one or both of the fluid inflow / outflow pipes 2 and 3 of the motor-operated valve is set to be substantially the same as the inner diameter of the pipe continuous to the fluid inflow / outflow pipes 2 and 3, and the diameter is set to the continuous inner diameter portion. The effect of noise suppression is obtained by not forming a small number of parts.
FIG. 1 shows a case where the inner diameter of the fluid inflow pipe 2 and the inner diameter of the pipe 4 are made substantially the same when the fluid inflow pipe 2 is expanded and the pipe 4 is connected to the connection point 5. Of course, when connecting the pipe 4 to the fluid outflow pipe 3, the same configuration as that of the fluid inflow pipe 2 may be adopted. Furthermore, as another embodiment of the present invention, the valve body 50 constituting the valve motor-operated valve is provided with a stool cross-sectional area in the valve chamber in the axial direction.
The effect of noise suppression can be obtained by forming the step portion in which the seat side becomes smaller. In FIG. 1, the valve body 50 has a shaft
Horizontal cross-sectional area inside the valve chamber 81 in the line direction
Is formed with a step portion 51a that becomes smaller on the toilet seat 82 side.
It

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Claims (4)

[Claims] 1. A can which has a valve body for adjusting a passing flow rate by a valve body which is brought into and out of contact with a valve seat in a valve chamber by a valve shaft and a rotor which is fixed to the valve body and brings the valve body into and out of contact with the valve seat. When,
A motor-operated valve equipped with a stator fitted onto the can to rotate and drive the rotor, comprising: a valve body receiving taper portion that expands an orifice formed in a valve seat toward a valve chamber side; and a cylinder having a substantially uniform diameter. And a flow-in taper portion that expands and opens toward the flow-in pipe side. The length of the tubular portion in the fluid flow direction is approximately 0.3 mm and the opening angle of the flow-in taper portion is approximately 20 degrees. An electric valve that is characterized. 2. The diameter of the valve chamber at the upper position of the valve seat is 4.3.
The motorized valve according to claim 1, wherein the motorized valve has a size of about mm. 3. The motor-operated valve according to claim 1, wherein the fluid inflow pipe connected to the motor-operated valve is not formed with a portion having a small diameter in the flow direction. 4. The motor-operated valve according to claim 1, wherein the step portion is formed so that the horizontal cross-sectional area of the valve body in the valve chamber portion is smaller on the valve seat side.