JP2000356278A - Motor-driven flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven flow control valve easily assembled with few assembly mandays, easily handled and considerably reduced in assembly cost. SOLUTION: This motor-driven flow control valve 10' is provided with a valve body 11 having a valve element 17 in a valve chamber, and a motor 30 fixedly placed on the upper part of the valve body 11. The motor 30 has a closed case 31, a stator coil 32 disposed outside of the closed case 31, and a rotor disposed in a case internal chamber on the inside. The valve element 17 is connected to the rotor by a valve stem 20, and the motor-driven flow control valve 10' permits the communication between the valve chamber and the case internal chamber with a control fluid. The rotor is provided with a magnet 39 disposed on the outside and a sleeve 34 disposed on the inside, and thread-fastened at the sleeve 34 to a fixed guide 40 fixed to the valve body 11, and the magnet 39 and sleeve 34 are fixed by a plate spring 45 and a C-shaped retaining ring 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric flow control valve, and more particularly to an electric flow control valve for controlling a flow rate of a fluid such 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 an inner periphery, and a lower end thereof is fixed to an upper portion of the valve body, and a stainless steel fixing guide is engraved with an external thread on an outer periphery, 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 valve shaft also moves up and down by the up and down movement of the rotor, and the valve body fixed to the lower end of the valve shaft moves with respect 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. 3 shows the conventional motorized flow control valve, in which 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 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 21 is screwed and fixed to the valve body 11 so as to be able to adjust a vertical position.

[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 is provided with an electric signal.

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. Sleeve 34
Is made of stainless steel having high hardness, a plurality of teeth have a large inclination angle, a large elastic contact force, and a large bonding strength.

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
While being fixed by a ring 41, between the intermediate step portion of the valve shaft 20 and the inner washer 42 of the connection wall of the sleeve,
A buffer spring 43 for urging the board 17 in the valve closing direction is interposed.

When the stator coil 32 of the electric motor 30 is excited by an external electric (pulse) signal, the conventional electric flow control valve 10 constructed as described above
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. To control the flow rate of the refrigerant controlled by the electric flow control valve 10 in accordance with the amount of the electric signal applied to the stator coil 32.

[0014]

In the conventional electric flow control valve, since the sleeve and the magnet are fixed with an adhesive, an adhesive applying step and a heating step for solidifying the adhesive are required. It took a long time for the temperature to drop later, and also required fixing with a toothed retaining ring. Therefore, the conventional electric flow control valve requires a plurality of steps, has a trouble that handling is troublesome, and has a problem that an assembling operation is complicated and an assembling cost is required. The present invention has been made in view of the above problems of the electric flow control valve, and an object of the present invention is to provide an electric flow control valve that can be easily assembled with a small number of assembling steps, is easy to handle, and can greatly reduce assembly cost.

[0015]

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 rotor has a magnet on the outside and a sleeve on the inside, and is screwed with a fixed guide attached to and fixed to the valve body with the sleeve, and the magnet and the sleeve are fixed by a disc spring and a C-shaped tongue wheel. It is characterized by:

In the motor-operated flow control valve of the present invention thus constructed, the sleeve and the magnet can be integrally fixed without using an adhesive, so that the number of assembling steps is greatly reduced, and the assembling is greatly simplified as a whole. An electric flow control valve having a large coupling strength between the sleeve and the magnet can be obtained.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an electric flow control valve 10 'of the present embodiment. The basic structure and operation are the same as those of the conventional electric flow control valve shown in FIG. 3, and in FIG. Since only the fixing means is different, the same parts as those in the configuration of FIG.

In the embodiment of FIG. 1, the rotor 33 '
In order to fix the space between the sleeve 34 and the magnet 39, a disc spring 45 and a C-shaped tongue wheel 46 are used, and there is no adhesive between the sleeve 34 and the magnet 39. The hole formed in the center of the disc spring 45 has a sleeve 3
4 is fitted into the connecting wall 34a which is a cylindrical wall formed on the upper part of the cover 4, and a disc spring 45 is brought into contact with the magnet 39, and a C-shaped tongue wheel 46 is mounted in a groove formed in the connecting wall 34a. As a result, the disc spring 45 is strongly pressed. Thereby, the sleeve 34 and the magnet 39 are fixed by the frictional force between them. With this configuration, the coupling strength between the sleeve 34 and the magnet 39 increases,
The sleeve 34 and the magnet 39 are firmly fixed.

Further, the upper end of the valve shaft 20 is press-fitted with the push nut 47 as a press-fitting member, and is tightly fitted. In addition, after a not-shown split portion is inserted into the end face 48 of the protruding end of the valve shaft 20 together with the interference fit, the split portion may be fixed by expanding in the radial direction.

FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts. ,
A trapezoidal projection 34d is formed on the upper part of the sleeve 34,
A disc spring 45 is fitted into the base 34c of the projection 34d by a hole formed at the center thereof, the disc spring 45 is brought into contact with the magnet 39, and a C-shaped ring is formed in a groove formed in the base 34c. 46, the disc spring 4
5. Press strongly.

With such a configuration, the sleeve 34 and the magnet 39 are strongly fixed to each other with a large bonding strength without using an adhesive and a toothed retaining ring.
Moreover, according to the present embodiment, since the disc spring and the C-shaped tongue wheel are mounted on the convex portion 34d of the sleeve 34, there is an effect that the mounting is easy. In FIG. 2, the upper end 20 a of the valve shaft 20 extending upward penetrates through the projection 34 d, and the protruding end is fixed by a C-shaped tongue wheel 41.

Also, in the embodiment of the present invention shown in FIGS. 1 and 2, unlike the conventional electric flow control valve, the valve opening restricting pin and the fully open stopper are omitted. It is needless to say that the valve opening restriction pin and the fully open stopper may not be provided by controlling the upper limit of the valve opening by controlling the number of pulses.

[0023]

As will be understood from the above description, the motor-operated flow control valve of the present invention fixes the sleeve and the magnet integrally with the disc spring and the C-shaped tome wheel without using an adhesive. The man-hour required for fixing is greatly reduced by the mounting material,
As a whole, the assembly can be greatly simplified, and an electric flow control valve having a large coupling strength between the sleeve and the magnet, which can greatly reduce the assembly cost, can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing another embodiment of the electric flow control valve according to the present invention.

FIG. 3 is a longitudinal sectional view showing a configuration of a conventional electric flow control valve.

[Explanation of symbols]

 10 ', 10 "Electric flow control valve 11 Valve main body 15 Valve chamber 20 Valve shaft 21 Valve seat 30 Electric motor 31 Sealed case 33 Rotor 34 Sleeve 39 Magnet 40 Fixed guide 45 Disc spring 46 C-shaped tome wheel

Claims (3)

[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. In the motorized flow control valve described above, the rotor is provided with a magnet on the outside and a sleeve on the inside, and is screwed with a fixed guide attached and fixed to the valve body with the sleeve. A motorized flow control valve characterized by being fixed with a mold rim. 2. The electric flow control valve according to claim 1, wherein the disc spring and the C-shaped tongue wheel are mounted on a cylindrical wall of the sleeve. 3. The electric flow control valve according to claim 1, wherein the disc spring and a C-shaped tongue wheel are mounted on a convex portion of the sleeve.