JP2001159473A - Electrically operated flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically operated flow control valve for use in a refrigerating cycle with ammonia as the cooling medium. SOLUTION: The electrically operated flow control valve 10' has a stainless valve body 11' and a closed case 31', both being bonded through abutment welding. In the closed case 31', a stainless sleeve 34 integrated with a magnet 39 is threaded to a stainless fixed guide 40. The sleeve 34 controls the opening of a flow passage spaced to a valve seat 12 by vertical movement of a valve stem 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric flow control valve, and more particularly to an electric flow control valve for controlling the flow rate of ammonia as a refrigerant used in a refrigeration cycle such as cooling and heating.

[0002]

2. Description of the Related Art A conventional electric flow control valve used in a refrigeration cycle includes a valve body having a valve seat and a valve body in a valve chamber, and a stepping motor and the like disposed on the valve body. An electric motor, wherein the electric motor includes a cylindrical closed case, a stator coil disposed outside the closed case, and a rotor disposed in a case inner chamber of the closed case. . The rotor is formed of an aluminum or stainless steel sleeve disposed on the inner peripheral side and a ferrite magnet disposed on the outer peripheral side.

A long rod-shaped valve shaft extends from the case inner chamber to the valve chamber. One end of the valve shaft is slidably fixed to the sleeve of the rotor, and the other end is connected to the other end. Is fixing the valve body. In the aluminum sleeve of the rotor, a female screw is engraved on the inner periphery, and a lower end thereof is fixed to the upper part of the valve body, and a stainless steel fixed guide is engraved on the outer periphery with a stainless steel fixed guide. The female screw and the male screw are rotatably supported by being screwed together.

[0004] The electric flow control valve having the above-described structure acts to rotate the rotor by energizing and exciting the stator coil. Since the inner circumference of the rotor is screwed to the outer circumference of the fixed guide,
Vertical movement is performed by the rotation. Since the valve shaft is slidably fixed to the rotor, the rotation of the rotor causes the valve shaft to move up and down, and the valve body fixed to the lower end of the valve shaft moves relative to the valve seat. The flow rate of the refrigerant passing through the electric flow rate control valve is adjusted by adjusting the flow path gap.

[0005] The case inner chamber and the valve chamber are in communication with each other, and the refrigerant in the valve chamber flows into the case inner chamber. Is supplied to the threaded portion of the female screw and the male screw of the sleeve and the fixed guide, thereby lubricating the threaded portion and improving the rotation of the threaded portion. .

The specific configuration of such a conventional electric flow control valve is disclosed in Japanese Patent Application Laid-Open No. 10-89521.
FIG. 2 shows the conventional electric flow control valve. A valve body 11 made of a material such as brass has a motor 30 such as a stepping motor mounted and fixed on an upper portion thereof, and a pipe connection threaded outside thereof. In addition to the parts 12 and 13, the lower part has an opening 18 into which a plug 19 is screwed. The upper part of the plug 19 of the valve main body 11 is configured as a valve chamber 15, in which the valve element 17 and the valve seat 21 are arranged on the same axis. The valve body 17 is attached and fixed to a valve shaft 20, and the valve seat body 21 is screwed and fixed to the valve main body 11 so that the vertical position can be adjusted.

[0007] In the pipe connecting portion 12, an inlet side passage 1 is provided.
2a is drilled, and an outlet side passage 13a is drilled in the pipe connection portion 13 so that both passages 12a, 13a are formed.
a is connected to the valve chamber 15 and has strainers 12b and 13b in the two passages, respectively. The intermediate portion of the valve shaft 20 is connected to the upper portion 1 of the valve body 11.
The upper portion 20a of the valve shaft 20 is inserted into the electric motor 30 while being slidably supported by the shaft 1a.

The electric motor 30 has a cylindrical closed case 31 made of a non-magnetic plate mounted and fixed on the upper portion 11a of the valve body 11, and is disposed outside the closed case 31. It is composed of a stator coil 32 and a rotor 33 arranged in a case inner chamber 31a of the closed case 31. The rotor 33 is formed by a stainless steel sleeve 34 disposed on the inner peripheral side and a ferrite magnet 39 disposed on the outer peripheral side.
0 from outside of the stator coil 3 via the wiring 32a.
2, a pulse input is applied. In addition,
In the stator coil 32, a fixed plate 50 for preventing rotation is supported by a fixed base 51, and the fixed plate 50 is engaged with the case 31.

Further, the sleeve 34 of the rotor 33
The magnet and the magnet 39 have their fitting joints adhered and fixed with an adhesive, and are also fixed by pushing a toothed retaining ring 44 shown at an upper portion thereof. The toothed retaining ring 44 is formed of an elastic material such as a spring material, and a plurality of inner teeth elastically contact the outer periphery of the sleeve 34.

The closed case 31 is formed by a lower lid 31b and a can body 31c.
1), a fully-closed stopper 35 is fixed, and a valve-closing restricting pin 36 screwed to the lower end of the sleeve 34 of the rotor 33 so as to adjust the amount of protrusion is provided on the outer periphery of the fully-closed stopper 35. By contacting the surface, the lower limit of valve closing of the rotor 33 is restricted. A valve-opening restricting pin 37 is screwed to the upper end of the sleeve 34 so that the amount of protrusion can be adjusted, and when the valve 17 is fully opened, it comes into contact with a stopper 38 at the upper end of the can body 31c. Rotor 33
The upper limit of valve opening.

An upper portion 11a of the valve body 11 is provided with a stainless steel hollow cylindrical fixed guide 4 coaxially with the valve shaft 20 and slidably inserted into the valve shaft 20.
0 is fixed. A male screw 40a is engraved on the outer periphery of the fixed guide 40, and a female screw 34b is engraved on the inner periphery of the center of the sleeve 34. The male screw 40a and the female screw 34b It is screwed.

A valve shaft 2 extending upward from the valve main body 11, penetrating through the cylinder of the fixed guide 40, and further extending upward.
0 is connected to the upper connecting wall 3 of the sleeve 34.
4a penetrates the hole formed in the center of the
A buffer spring 43 for urging the valve element 17 in the valve closing direction is interposed between the intermediate step portion of the valve shaft 20 and the inner washer 42 of the connection wall of the sleeve, while being fixed by the ring 41. .

When the stator coil 32 of the electric motor 30 is energized by applying a pulse signal from the outside, the conventional motorized flow control valve 10 having the above-described structure causes the rotor 33 to rotate based on the electric signal amount. It rotates a predetermined amount. The rotor 33 is fixed to the fixed guide 40 by the
4b, 40a, the rotor 33
The valve shaft 17 is moved in a predetermined vertical direction by the rotation thereof, and the fixed valve shaft 20 is similarly moved in a predetermined vertical direction. Is moved to control the flow rate of the refrigerant controlled by the electric flow rate control valve 10 in accordance with the amount of the pulse input applied to the stator coil 32.

[0014]

Recently, however, the use of chlorofluorocarbon (eg, R-12) as a refrigerant has been limited due to environmental problems such as destruction of the ozone layer. Ammonia is used as an alternative refrigerant instead of the above, and when this ammonia is used to control the flow rate, a brass material is used as a metal constituting the electric flow control valve, such as a conventional electric flow control valve. When the metal is used, there is a problem that the metal is corroded by ammonia.

Further, when the lower lid is used as in the conventional motorized flow control valve, there is a problem that the number of parts is large, so that assembling man-hours are required and assembly costs are high. An object of the present invention is to provide an electric flow control valve that can be used for controlling the flow rate of ammonia as a refrigerant and that can reduce assembly costs in view of the problem of such an electric flow control valve.

[0016]

In order to achieve the above object,
The electric flow control valve of the present invention includes a valve body having a valve body in a valve chamber, and an electric motor mounted and fixed on an upper part of the valve body,
The electric motor has a closed case, a stator coil disposed outside the closed case, and a rotor disposed in an inner case inner chamber, and the valve body is connected to the rotor by a valve shaft. Along with the electric flow control valve, wherein the valve chamber and the case inner chamber allow communication of a control fluid,
The valve body and the sealed case are made of stainless steel, and are fixed to the valve body by welding.

In a preferred specific embodiment of the electric flow control valve according to the present invention, the rotor is provided with a magnet on the outside and a stainless steel sleeve on the inside, and the stainless steel fixed to the valve body with the sleeve. It is characterized by being screwed with a fixed guide made of steel.

In the motor-operated flow control valve of the present invention having the above-described structure, the valve body and the sealed case are formed of stainless steel and are fixed to each other by welding, so that the flow rate of ammonia as a refrigerant can be controlled. In addition, an electric flow control valve whose assembly is simplified can be obtained.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a longitudinal sectional view of an electric flow control valve 10 'of the present embodiment, and has the same basic configuration and operation as the conventional electric flow control valve shown in FIG. 2, and in FIG. Since the configuration is different from that of the valve body, the same parts as those in the configuration in FIG. In the embodiment of FIG. 1, the outlet passage 13 a formed in the pipe connection portion 13 is connected to the inlet passage 1.
It is configured at right angles to 2a and has no upper end stopper.

In the embodiment shown in FIG.
1 'and the valve body 11' are made of stainless steel, and the sealed case 31 'is applied to the valve body 11' by welding and the sealed case 31 'is fixed to the valve body 11'. Therefore, in the embodiment of FIG. 1, the closed case fixes the can body 31c 'to the valve body 11', so that there is no lower lid.

In FIG. 1, W is a can body 31.
This shows welding between c ′ and the valve body 11 ′, and a stainless steel fixed guide 40 that is inserted coaxially with the valve shaft 20 and slidably inserts the valve shaft 20 is provided in the upper portion 11 a ′ of the valve body 11 ′. The male screw 40a engraved on the outer periphery of the guide 40 and the female screw 34b engraved on the inner periphery of the center of the sleeve 34 are screwed together.

Further, although the fitting joint between the sleeve 34 and the magnet 39 is fixed with an adhesive, it is not always necessary to use an adhesive. A trapezoidal projection 34d is formed on the upper part of the stainless steel sleeve 34, and a disc spring 45 is fitted into a root 34c of the projection 34d by a hole formed at the center thereof, and the disc spring 45 is magnetized. The disc spring 45 is strongly pressed by attaching the C-shaped tongue wheel 46 to a groove formed in the dish at the base portion 34c.

Further, the upper end 20a of the valve shaft 20 has its protruding end press-fitted with the push nut 47 as a press-fitting member, and is tightly fitted. Further, the end face 48 of the protruding end of the valve shaft 20 may be fixed in a radially expanded manner together with the interference fit.

When the stator coil 32 of the electric motor 30 is excited by an external pulse signal, the electric flow control valve 10 '
The rotor 33 rotates a predetermined amount based on the electric signal amount. The rotor 33 is fixed to the fixed guide 40 by the
4a and 40a, the rotor 33
The valve shaft 17 is moved in a predetermined vertical direction by the rotation thereof, and the fixed valve shaft 20 is similarly moved in a predetermined vertical direction. By moving the ammonia flow controlled by the electric flow control valve 10 ′ to the stator coil 32.
Can be controlled in accordance with the amount of pulse input given to.

[0025]

As will be understood from the above description, the motor-operated flow control valve of the present invention has a valve body and a can body made of stainless steel, so that ammonia can be used as a refrigerant and assembly is simplified. An electric flow control valve with a small number of assembly steps can be provided.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a conventional electric flow control valve.

[Explanation of symbols]

 10 'Electric flow control valve 11' Valve body 31c 'Can body 34 Sleeve 40 Fixed guide

Claims (2)

[Claims] 1. A valve body having a valve body in a valve chamber, and a motor mounted and fixed on an upper portion of the valve body, wherein the motor is a sealed case, a stator coil disposed outside the sealed case, and A rotor disposed in an inner case inner chamber, and the valve body is connected to the rotor by a valve shaft, and the valve chamber and the case inner chamber can communicate control fluid. An electric flow control valve according to claim 1, wherein the valve body and the sealed case are made of stainless steel and are fixed to the valve body by welding. 2. The rotor according to claim 1, wherein a magnet is disposed on an outer side and a stainless steel sleeve is disposed on an inner side, and the sleeve is screwed with a stainless fixing guide fixed to the valve body. 2. The electric flow control valve according to 1.