JPH07158762A - Proportional solenoid valve - Google Patents

Abstract

PURPOSE:To provide a proportional solenoid valve in which a valve seat to contact a valve element is installed in such a way as capable of reducing the influence of the distortion of a case body. CONSTITUTION:A proportional solenoid valve comprises a valve element 8 reciprocating with the aid of a rod 9 coupled with a plunger 10 set in a coil 20, an aux. holder 12 installed in the lower part of a holder 11 fixed to a frame 25, a resilient piece 18 to be interposed between a resilient receptacle 16 mounted on the rod 9 and the under-corner of a valve seat 5, and a body case 1 equipped with an inlet 2 and outlet 3 for a fluid, wherein the top 5b of the valve seat is interposed between the holder 11 and aux. holder 12. This accomplishes reducing the influence of eventual distortion of the body case likely when connection is made to other apparatus, which enables a rate-of-flow control of approx. the same accuracy as at factory inspection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a proportional solenoid valve, and more particularly to mounting a valve seat that abuts a valve body.

[0002]

2. Description of the Related Art In the structure of a conventional proportional solenoid valve, a valve seat is formed in a main body case which forms an inlet and an outlet of a fluid, and a flow rate is controlled by a gap between the valve seat and an abutting valve body. ing. Further, it is desired that these proportional solenoid valves stably control a wider flow rate range, and in particular, as the accuracy of peripheral equipment becomes higher, the accuracy of the minimum flow rate performance is desired to be improved.
Therefore, the proportional solenoid valve is assembled by processing the valve body and the valve seat that contacts the valve body with micron-order accuracy.

[0003]

The proportional solenoid valve assembled by the valve body and the valve seat machined with high accuracy as described above satisfies the required accuracy at the time of factory inspection. However, when the solenoid valve is connected to another device, the fluid inlet and outlet formed in the main body case are connected via a joint such as a screw or a flange. At this time, since the body case is distorted, the valve seat formed on the body case is also distorted.
As a result, in particular, the minimum flow rate performance is deteriorated.
Therefore, the present invention provides a proportional solenoid valve that can reduce the influence of stress and the like from the main body case and can improve the minimum flow rate performance.

[0004]

The proportional solenoid valve of the present invention comprises:
A valve body that reciprocates via a rod connected to a plunger built into the coil, an auxiliary holder disposed below the holder fixed to the frame, an elastic receiver attached to the rod, and a lower corner portion of the valve seat. It has an elastic body to be fitted between and a main body case for forming a fluid inlet and a fluid outlet, and the upper end of the valve seat is fitted to the holder and the auxiliary holder.

[0005]

The upper end of the valve seat is fitted into the holder and the auxiliary holder fixed to the frame, while the lower part of the valve seat is biased toward the valve body by the elastic body. That is,
The valve seat is supported by the holder and the auxiliary holder, and is attached separately from the main body case.
As a result, the valve seat can reduce the influence of the strain generated in the main body case, and can improve the flow rate accuracy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Reference numeral 1 is a main body case 1 made of aluminum die casting or the like, in which a fluid inlet 2 and a fluid outlet 3 are formed to communicate with each other, and a valve body 8, a valve seat 5 and the like, which are connected to a frame 25 and the like at the upper part, can be internally mounted The opening 1a is formed. Reference numeral 12 denotes an L-shaped auxiliary holder, which is placed in the opening 1a via an annular sheet packing 32.
Reference numeral 14 denotes a disk-shaped diaphragm having a locking portion 14a formed on the outer peripheral edge thereof, and the inner peripheral edge is fixed by a diaphragm washer 15 fitted on the rod 9 and an elastic receiver 16 via a push nut 17, The locking portion 14a formed on the outer peripheral edge is inserted into the holder 11 and the auxiliary holder 12 to prevent leakage to the upper portion. Reference numeral 5 denotes a valve seat, which is formed by pressing a nonmagnetic plate such as aluminum or brass to have an S-shaped cross section, and has a lower tip portion serving as a valve seat portion 5a. The upper end portion 5b of the valve seat 5 is fitted into the holder 11 and the auxiliary holder 12 inside the locking portion 14a of the diaphragm 14, while the lower portion is placed on the V-shaped packing 31. Therefore, the valve seat 5 is so-called swingable, is formed separately from the main body case 1, and is in contact with the main body case 1 via the V-shaped packing 31 and the seat packing 32. is there.

The metal valve body 8 has an inclined outer peripheral edge which abuts on the valve seat portion 5a, is connected to the plunger 10 via the rod 9, and reciprocates. The rod 9
An elastic receiving body 16 is attached to the valve seat 5, and an elastic body 18 is inserted between the bent lower corner portion 5c of the valve seat 5 and is always inserted.
The valve body 8 is urged upward and brought into contact with the valve seat portion 5a to be in a closed state. Reference numeral 20 is a coil wound on a cylindrical bobbin 21, and the plunger 10 is inserted through a thin-walled cylindrical guide body 22 to form a frame 25 and a frame 25.
It is fixed to the lower part by a fixed holder 11. Reference numeral 27 is a pressure adjusting rod, which is a recess 1 formed in the upper portion of the plunger 10.
The pressure regulating elastic body 28 is expanded and contracted by rotating the pressure regulating rod 27.
The downward biasing force of 0 can be adjusted. 26 is
The cap is mounted on the frame 25.

In the proportional solenoid valve having the above structure, when the coil 20 is not energized, the elastic body 18 causes the valve body 8 to move.
Is biased upward, and the valve seat portion 5a and the inclined portion of the valve body 8 come into contact with each other to be in a closed state. On the other hand, when a predetermined current is passed through the coil 20, the plunger 10 acts as an electromagnet, overcomes the elastic force of the elastic body 18, and moves downward to move the inclined portion of the valve body 8 and the valve seat portion 5a. The fluid from the fluid inlet 2 flows out to the fluid outlet 3 through the gap, and the flow rate is adjusted by increasing or decreasing the gap according to the current value of the coil 20.

When the proportional solenoid valve is connected to another device or the like, the fluid inlet 2 and the fluid outlet 3 are connected to, for example, the screw connection pipe 30 shown in FIG. 1 via a seal tape or the like. At this time, the main body case 1 is distorted by the rotation of the screw connection pipe 30, but the valve seat 5 is attached to the main body case 1 in a state of being in contact with the main body case 1 via the V-shaped packing 31 and the seat packing 32. Therefore, the influence of such distortion is reduced. As a result, unlike the conventional proportional solenoid valve, the distortion of the main body case distorts the valve seat, which causes deterioration of the minimum flow rate accuracy. The distortion of the main body case 1 does not affect the valve seat 5, and can maintain substantially the same accuracy as the inspection after assembly at the factory, and in particular, the accuracy of the minimum flow rate can be improved.

[0010]

In the proportional solenoid valve of the present invention, the valve seat is mounted separately from the main body case by being inserted into the holder and the auxiliary holder, and therefore, the main body case generated when connecting to other equipment. The effect of distortion is reduced. Therefore, even if the proportional solenoid valve is connected to other equipment, it is possible to control the flow rate with substantially the same accuracy as in factory inspection.

[Brief description of drawings]

FIG. 1 is a view showing a cross section of a proportional solenoid valve.

[Explanation of symbols]

 1 Body Case 2 Fluid Inlet 3 Fluid Outlet 5 Valve Seat 5a Valve Seat 5b Upper Seat Edge 5c Valve Seat Lower Corner 8 Valve Disc 9 Rod 10 Plunger 11 Holder 12 Auxiliary Holder 16 Elastic Receptor 18 Elastic 20 Coil 25 Frame 30 Screw connection tube

Claims (1)

[Claims] 1. A valve body which reciprocates through a rod connected to a plunger built into the coil, an auxiliary holder arranged below a holder fixed to a frame, an elastic receiver attached to the rod, and a valve. An elastic body that is inserted between the lower corner of the seat and
What is claimed is: 1. A proportional solenoid valve having a main body case having an inlet and an outlet for fluid, wherein the upper end of the valve seat is fitted into the holder and an auxiliary holder.