JP2003287151A - Motor-operated valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for reducing noises of a motor-operated valve for controlling a flow rate of a refrigerant of an air conditioner. <P>SOLUTION: A valve chest 81 is formed in a valve body 80. A guide part 83 is formed in the valve chest 81. The guide part 83 contacts with an outside surface of a valve stem 51, and is formed in a cylindrical shape integrally with the valve body 80 so as to surround the periphery. A valve element 50 contacts with and separates from a valve seat 82 in the valve chest 81 by a driving mechanism by operation of a stepping motor, and adjusts a passing flow rate of the refrigerant between fluid inflow-outflow pipes 2 and 3. In this case, since the valve stem 51 is supported by the guide part 83, vibration of the valve element 50 by the passing of the refrigerant can be restrained, so that the noise generated by the vibration of the valve element 50 can be reduced. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a motor-operated valve incorporated and used in an air conditioner, a refrigerator, and the like. The present invention relates to a motor-operated valve with reduced pressure. 2. Description of the Related Art FIG. 4 shows an example of a motor-operated valve used 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, a can 20, and a stator (omitted in the drawing). And the valve body 1
0 adjusts the flow rate of the refrigerant between the fluid inlet / outlet pipes 2 and 3 by the valve body 50 which 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, And a rotor 40 for making the contact. Further, the stator is externally fitted to the can 20 and drives the rotor 40 to rotate. The rotor 40 and the stator constitute a stepping motor. More specifically, the can 20 has a bottomed cylindrical shape formed of a non-magnetic metal such as stainless steel, and has a flanged plate 16 fixed to the upper portion of the valve body 10 by welding. It is fixed by welding or the like, and the inside is kept airtight. The stator includes a yoke made of a magnetic material, and a stator coil wound around the yoke via a bobbin. 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 in which a fixed screw portion 61 is formed, and a moving screw portion screwed to the fixed screw portion 61. And a valve shaft holder 70 having a screw shaft 71.
It is arranged at a substantially central portion of the entire length in the axial direction. Note that 72
Is a fixed-side stopper integrally formed with the guide bush 60, and 73 is a movable-side stopper integrally formed with the valve shaft holder 70. [0004] As shown in FIG. 4, an orifice is formed in the valve seat 12. The orifice has a valve element receiving tapered portion 83 that expands and opens toward the valve chamber 11, and a cylindrical portion 8 having a substantially uniform diameter.
4 and the cylindrical portion 84 has a cylindrical shape with a substantially uniform diameter. [0005] In this type of motor-operated valve, noise may be generated as a refrigerant passing sound when the refrigerant passes through a refrigeration cycle using the motor-operated valve. As a result of the study by the present inventors, it has been found that the noise is generated based on the fact that the valve vibrates by the refrigerant when the refrigerant passes and the valve vibrates by itself. Therefore, the present invention has been made to solve the above-mentioned disadvantages of the related art, and an object of the present invention is to provide an electric valve capable of suppressing noise when a fluid such as a refrigerant passes. is there. [0006] In order to achieve the above object, a motor-operated valve according to the present invention is a valve body which adjusts a flow rate by a valve body which is brought into and away from a valve seat in a valve chamber by a valve shaft. And a can fixed to the valve body and having a built-in rotor for bringing the valve body into and out of the valve seat, and a stator externally fitted to the can and driving the rotor to rotate. A guide portion for guiding the valve shaft is provided. According to the electric valve of the present invention configured as described above, the vibration of the valve body can be suppressed by providing the guide portion of the valve shaft in the valve chamber, so that the generation of noise can be reduced. Hereinafter, an embodiment of a motor-operated valve according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a motor-operated valve according to the present embodiment, and FIGS. 2 and 3 are explanatory views of main parts of the motor-operated valve. In FIG. 1, members having the same configuration as in FIG. 3 showing a conventional example are denoted by the same reference numerals. As shown in FIG. 2, the valve chamber 81 formed in the valve body 80 in this embodiment has a guide portion 83 formed in the valve chamber 81, and the guide portion 83 contacts the outer surface of the valve shaft 51. Is formed on the surface of the valve chamber 81 in the axial direction of the valve shaft 51 so as to surround the periphery thereof. That is, the valve chamber 81 contacts the outer surface of the valve shaft 51 so as to support the valve shaft 51, and the valve chamber 8
One of the surfaces in the axial direction is formed as the guide portion 83. The orifice formed in the valve seat 82 of the valve body 80 in this embodiment is, as shown in FIG.
It comprises a valve body receiving taper portion 84 that expands and opens to the valve chamber 81 side, a cylindrical portion 85 having a substantially uniform diameter, and an inflow taper portion 86 that expands and opens to the fluid inflow pipe 2 side. In such an embodiment, the operation of the stepping motor causes the valve body 50 to be driven by the drive mechanism.
Comes into contact with and separates from the valve seat 82 in the valve chamber 81, and the fluid inflow / outflow pipes 2,
The flow rate of the refrigerant passing through the valve shaft 51 is adjusted.
Is supported by the guide portion 83, so that the vibration of the valve body 50 due to the passage of the refrigerant can be suppressed,
Noise caused by vibration of the valve body 50 can be reduced. As described above, according to the motor-operated valve of the present invention, the noise generated by the passage of the refrigerant can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of a motor-operated valve according to the present invention. FIG. 2 is an explanatory view of a main part of the embodiment shown in FIG. 1; FIG. 3 is an explanatory view of a main part of the embodiment shown in FIG. 1; FIG. 4 is a longitudinal sectional view of a motor-operated valve showing a conventional example. [Description of Signs] 1 motor-operated valve 2 fluid inflow pipe 3 fluid outflow pipe 10 valve body 11 valve chamber 12 valve seat 16 flange plate 20 can 40 rotor 50 valve body 51 valve shaft 60 guide bush 61 fixing screw portion 70 valve shaft holder 71 moving screw part 80 valve body 81 valve chamber 82 valve seat 83 guide part 87 counterbore part

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kazuyuki Fukui             7-17-24 Todoroki, Setagaya-ku, Tokyo             Inside the Fuji Machine Co., Ltd. F-term (reference) 3H051 AA01 BB10 CC11 FF08                 3H062 AA02 AA15 BB33 CC02 DD01                       EE08 HH04 HH08 HH09

Claims (1)

Claims: 1. A valve body for adjusting a passing flow rate with a valve body that is brought into and out of contact with a valve seat in a valve chamber by a valve shaft, and the valve body fixed to the valve body is brought into and out of contact with the valve seat. A motor-operated valve comprising a can having a built-in rotor and a stator externally fitted to the can and rotatably driving the rotor, wherein a guide portion for guiding the valve shaft is provided in the valve chamber. valve.