JPS62224778A - Safety relief valve - Google Patents

Abstract

PURPOSE:To relief a large amount of air when high pressure air incomes, by a method wherein a second valve, approaching and separating from a first valve in which an air hole is formed, is pressed against the air hole side by means of a stem. CONSTITUTION:An intake air hole 3 is formed in the end of an outer cylinder 1b, and a first valve 5, in which an air hole 4 is formed, and a second valve 6, approaching and separating from the first valve 5 to close and open the air hole 4, are located in a central part between the intake air hole 3 and a valve head 2a of a stem 2. The valve head 2a is pressed through the force of a spring 7 so as to close the intake air hole 3 with the second valve 6. A safety mechanism, wherein, when high pressure air incomes, the line of an exhaust hole 8 as well as the air hole 4, formed in the first valve 5, is opened, and a further large amount of air is relieved, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field This invention relates to a safety relief valve that can be used in various pneumatic circuits.

(b) Conventional technology and its problems Conventionally, there are 5 relief valves of various structures.

Of these, the most common is to use a ball valve mechanism pressurized by a spring;
If a large amount of high-pressure air that exceeds the pilot pressure flows in at once, it cannot be handled.

This will have a negative effect on the entire circuit.

(C) Means for Solving the Problems Therefore, the present invention provides a cylinder in which an intake hole is formed at one end of the cylinder, and an exhaust hole is formed at the other end and the side wall. A first valve with a vent hole formed therein, a second valve attached to and detached from the first valve to open and close the vent hole, and a valve rod that presses the second valve toward the vent hole side by a spring are provided. The basic configuration is that the cylinder is composed of an end metal structure of an inner cylinder and an outer cylinder, and a spring is stretched between the end of the inner cylinder and the valve head of the valve body, The open end of the inner cylinder should also serve as a stopper to restrict the stroke of the first valve beyond a certain level, and a sub-inner cylinder should be further screwed inside the inner cylinder, and the cylinder end of the sub-inner cylinder should be connected to the valve head. The above-mentioned problems are solved by optionally providing a spring tensioned between the cylinders and a valve tail of the valve body protruding outside the cylinder.

(D) Effect As a result of this, 1. When normal pilot pressure is applied,
The first valve and the second valve are pushed together against the spring to open the line between the intake hole and the exhaust hole,
When higher pressure air flows in, only the second valve now presses the spring to open the vent, and also opens the intake 2 vent and exhaust vent lines.

(e) Examples Examples of the present invention will be described below with reference to the drawings.
1 to 3 are sectional views of a safety relief valve according to the present invention, FIG. 4 is a sectional view of another example, and 5 to 3 are sectional views of a safety relief valve according to the present invention.
FIG. 7 is a partial cross-sectional view showing essential parts of another embodiment of the first valve and the second valve.

The safety relief valve according to the present invention has an inner cylinder 1a and an outer cylinder 1b that are butted and screwed together to form one cylinder 1, into which a piston-shaped valve rod 2 is inserted. Furthermore, specifically, the first valve 5 has an intake hole 3 formed at the end of the outer cylinder 1b, and a ventilation hole 4 formed in the center between the intake hole 3 and the valve head 2a of the valve stem 2. , this first valve 5
A second valve 6 is interposed between the valve head 2a and the valve tail 2b to open and close the air intake hole 4. It protrudes outward from the end of the cylinder 1a. Note that an exhaust hole 8 is appropriately formed in the side wall of the outer cylinder 1b (
In addition, if a certain amount of clearance is provided between the valve tail 2b and the inner cylinder 1a, this also becomes an auxiliary exhaust hole 8').

By the way, the specific structure of the one or more first valves 5 and second valves 6 is that the former is a ring-shaped plate with a ventilation hole 4 in the middle, and the latter is composed of a ball etc. that opens and closes the ventilation hole 4. is common (see FIG. 1), but there are also modifications shown in FIGS. 5 to 7.

That is, the valve head 2a is formed into a ring shape, and this serves as a ball (see Fig. 5).

The valve head 2a is formed into a conical shape to function as a ball (see Figure 6), and a conical body 5' with a ventilation hole 4 formed in the center is provided, which serves as a plate. (See Figure 7).

As described above, this safety relief valve is installed in the relief path of the air circuit, etc. At this time,
When a predetermined pilot pressure is applied to the intake hole 3, first, the first valve 5 and the second valve 6 are pushed together against the spring 7, and the line between the intake hole 3 and the exhaust hole 8 is opened to perform the relief function. (See Figure 2). In this case,
Movement of the ring plate 5 is regulated by contacting the open end of the inner cylinder 1a, and this open end is also used as a stopper.

Next, in addition to this, high pressure and.

When a large amount of air flows into the intake hole 3, only the second valve 6 moves against the spring 7, and in addition to the above relief path, the air intake hole 32, the ventilation hole 4, and the exhaust hole 8 (
Even if the first valve 5 is in contact with the open end of the inner cylinder 1a, a discharge groove 9 or the like is appropriately provided in this open end so that the line from the first ventilation hole 4 to the exhaust hole 8 is kept open.

In addition, a line (substantially, a line for an auxiliary exhaust hole 8' is also added to this line) is added to perform a safety function of relieving a larger amount of air (see FIG. 3).

Note that in one or more of the above, if a plug or the like for flow rate adjustment can be inserted into the exhaust hole 8 or the like, the flow rate can be adjusted here. Furthermore, by changing the threaded length of the inner cylinder 1a, the stopper position described above can be adjusted, and the strength of the spring 7 can also be adjusted.

In addition, if the valve tail 2b is made to protrude outside the cylinder 1,
Since it moves a predetermined stroke each time the relief function and safety function described above are performed, it can be used as an appropriate actuator.

On the other hand, in the example of FIG. 4, there is an additional sub-inner cylinder 1 inside the inner cylinder 1a.
c are screwed together, and a spring 7 is stretched between the cylinder end of the sub-inner cylinder 1c and the valve head 2a. According to this, when changing the screwing length of the sub-inner cylinder 1c, only the strength of the spring 7 can be adjusted (without changing the stopper position).

By the way, 2 and above are explanations when this safety relief valve is used as a so-called relief valve.
In addition to this use, it can also be incorporated into a pneumatic circuit line.

(f) In addition to the effects of the invention, this invention has the above-mentioned effects, that is, 2.
At normal biloft pressure, the first valve 5 and the second valve 6
It acts as a mere relief mechanism that opens the line between the intake hole 3 and the exhaust hole 8 by moving the valves integrally, but if air with a higher pressure than this flows in, the ventilation hole 4 and the exhaust hole formed in the first valve 5 8 line is also opened, and a safety mechanism that releases a larger amount of air is also activated.

[Brief explanation of drawings]

1 to 3 are sectional views of a safety relief valve according to the present invention, FIG. 4 is a sectional view of another example, and 5 to 3 are sectional views of a safety relief valve according to the present invention.
FIG. 7 is a partial cross-sectional view showing essential parts of another embodiment of the first valve and the second valve. (Symbol) 1.Cylinder 1a..Inner cylinder 1b..Outer cylinder 1c..Sub-inner cylinder 2..Valve stem 2a..Valve head 2b..Valve tail 3..Intake hole 4..Vent hole 5.・First valve 6 ・Second valve 7 ・Spring 8 ・Exhaust hole Patent applicant: Meiji Kikai Seisakusho Co., Ltd. Patent attorney Yoshi Itano Figure 1 8 ・Exhaust hole Figure 3

Claims (1)

[Claims] [1] Inside the intake hole (3) of a cylinder (1) having an intake hole (3) formed at one cylinder end and an exhaust hole (8) formed at the other cylinder end and side wall. In this order, a first valve (5) having a ventilation hole (4) formed in the center, a second valve (6) attached to and attached to the first valve (5) to open and close the ventilation hole (4),
A safety relief valve characterized in that each valve stem (2) is provided that presses the second valve (6) toward the ventilation hole (4) by a spring (7). [2] The cylinder (1) has an inner cylinder (1a) and an outer cylinder (1b)
The spring (7) is connected to this inner cylinder (
1a) and the valve head (2a) of the valve stem (2).
The safety relief valve described in item 1]. [3] The safety relief valve according to claim [2], wherein the open end of the inner cylinder (1a) also serves as a stopper for regulating the stroke of the first valve (5) beyond a certain level. [4] Further screw the sub-inner cylinder (1c) inside the inner cylinder (1a), and tighten the spring (7) between the cylinder end of this sub-inner cylinder (1c) and the valve head (2a). A safety relief valve according to claim 2 or claim 3, wherein the safety relief valve is provided with a safety relief valve. [5] Any one of claims [1] to [4], characterized in that the valve tail (2b) of the valve stem (2) protrudes outside the cylinder (1). Safety relief valve described in.