JPH09100926A - Safety valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly confirm valve opening action caused by abnormal pressure by fittingly mounting a flexible disc film like closing cover sheet in the caulking space of a body and a plate in such a way as to come in contact with the outer surface of the plate while holding an air clearance to a body caulking inner diameter face. SOLUTION: A valve holder 3 is provided in a valve chamber 9 of a valve body 1 movably with a fluid flow clearance, and a spring 4 for energizing the valve holder 3 in a valve opening direction is built in between the valve holder 3 and a plate 5 provided with a cutout part 16 at the periphery and fixed by caulking to a caulking part 8 of the valve body 1. A flexible disc film like closing cover sheet 7 with an outer diameter smaller than the outer diameter of the plate 5 and larger than the inner diameter of the opening end of the body caulking part 8 is fittingly mounted in a caulking space of the body 1 and plate 5 in such a way as to come in contact with the outer surface of the plate 5 while holding an air clearance 14 to a body caulking inner diameter face 10. When a valve is opened due to the abnormal rise of fluid pressure, the sheet 7 is deformed in protruding curved shape and blown off to the outside giving in to internal pressure in the end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve for preventing an increase in pressure of a pressure fluid in a closed circuit such as a car cooler or an air conditioner when the pressure fluid rises abnormally. It is.

[0002]

2. Description of the Related Art FIGS. 3A and 3B show a safety valve according to a conventional example 1. A pressure inlet 11 for introducing a pressure fluid such as a refrigerant or steam is provided at one end of a valve body 1. A circular plate 5a having a convex edge portion for preventing a lateral displacement of the outlet 6 and the spring 4 is provided at a central portion of the caulking portion 8.
It is attached by.

In the main body 1, there is provided a valve seat 12 located on the side of the pressure introducing port 11, and a valve holder 3 which is movable in a valve chamber 9 in which a valve body 2 which comes into contact with and separates from the valve seat 12 is mounted. The valve holder 3 is urged by a spring 4 in the valve closing direction, and the valve body 2 comes into contact with the valve seat 12 to close the valve at a normal pressure value equal to or lower than the operating pressure. In addition, a pressure equalizing hole 15 is formed in the center of the holder 3 to allow the fitting holding portion of the valve body 2 to communicate with the inside of the holder.

An adhesive sheet 7a for closing the central outlet 6 is removably attached to the plate 5a. When the pressure of the pressure inlet 11 rises abnormally, the adhesive sheet 7a overcomes the elasticity of the spring 4. The valve body 2 is opened so as to be separated from the valve seat 12, and high-pressure fluid such as refrigerant flows into the valve body 1 and the valve holder 3.
Flows into the valve chamber 9 through the fluid flow gap g, and blows off the plate-attached sheet 7a and blows out from the outlet 6, thereby returning the pressure of the high-pressure fluid to a normal value. The blowing operation can be checked.

[0005]

However, FIG. 3 (A)
In the safety valve of Conventional Example 1 shown in (B), even if the valve element 2 is opened when the fluid pressure rises abnormally, the pressure fluid such as the refrigerant flows through the spring 4.
, A pressure loss occurs in this portion.

In particular, when the amount of fluid discharge is large and the opening of the valve body 2 is large, the spring 4 is compressed by an amount corresponding to the increase of the valve opening, and the gap between the windings is reduced. The passing fluid is throttled, the pressure loss further increases, the blowout flow rate becomes insufficient, the abnormal pressure rise cannot be discharged within a predetermined time, and the pressure rises to the pressure resistance or burst pressure of the components in the closed circuit, Had the disadvantage of damaging

[0007] Further, the sheet 5a is attached to the plate 5a.
Is adhered, the interior of the valve chamber 9 of the valve body 1 is closed, and when the temperature of the outside air increases, the pressure in the valve chamber 9 also increases, and the adhesive sheet 7a is partially removed from the plate 5a. The sticking sheet 7a may be peeled off and the blowing operation display may be erroneously recognized.
It was necessary to provide a slit-shaped notch 13 in the opening.

In order to reduce the above-mentioned disadvantages, FIG.
As shown in (A) and (B), when the valve body 2 is opened by partially notching the periphery of the plate 5b, the pressure fluid passes through the inner peripheral portion of the valve body 1 and the notch portion of the plate 5b. There is a safety valve of the type that does not pass between the windings of the spring 4 and is discharged from the outside.

However, the safety valve of the prior art 2 has a problem that dust enters into the valve chamber 9 and hinders the valve operation since the notch 16 of the plate 5b is open to the atmosphere. There was also a drawback that could not be confirmed.

The present invention has been devised in order to solve the above-mentioned conventional problems. The purpose of the present invention is to allow ventilation between the valve chamber and the outside air at a normal pressure, and to prevent abnormal flow when the fluid pressure rises abnormally. Another object of the present invention is to provide a highly practical safety valve that satisfies a dustproof function in which a closing sheet for operation check is completely blown off and a valve opening operation due to abnormal pressure can be accurately checked.

[0011]

In order to achieve the above object, a safety valve of the present invention is a valve body 1 having a pressure inlet 11 and a valve seat 12 at one end and a caulking portion 8 at the other end. When,
A valve holder 3 having a valve body 2 that comes into contact with and separates from the valve seat 12 and is movably provided in a valve chamber 9 of the main body 1 with a fluid flow gap g provided therein, and a notch 16 around the valve holder 3. A body comprising a plate fixed to the caulking portion of the main body, and a spring incorporated between the plate and the valve holder to bias the holder in a valve closing direction; 1
And a flexible disk film-shaped cover sheet 7 having an outer diameter smaller than the outer diameter of the plate 5 and larger than the inner diameter of the opening end of the body caulking portion 8 in the caulking space of the plate 5.
Is fitted to the outer surface of the plate 5 while maintaining the ventilation gap 14 between the inner surface 10 of the main body and the caulking. When the valve is opened due to an abnormal increase in fluid pressure, the seat 7 is pushed by the valve chamber pressure. It is characterized by being deformed into a convexly curved shape along the inner diameter surface 10 of the caulking shape, and finally blown out against the internal pressure.

[0012]

According to the safety valve having the above-mentioned structure, the ventilation between the inside of the valve chamber 9 and the outside air at the time of normal pressure can be secured by the ventilation gap 14 between the lid closing sheet 7 and the caulking inner diameter surface 10. It is not necessary to provide the notch 13 as in the conventional example 1 in the conventional example 7, and the seat 7 and the body caulking portion 8 can also provide a dustproof function in the valve chamber 9.

When the fluid pressure rises abnormally,
The closing sheet 7 for operation confirmation is deformed into a convex curved shape as shown in FIG. 2A along the inner diameter surface 10 of the caulking while being pressed by the pressure in the valve chamber, and finally loses the internal pressure. Since the air blows completely outward through the state, the valve opening operation due to the abnormal pressure can be accurately confirmed by watching the state of the air blow.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a safety valve according to one embodiment of the present invention will be specifically described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a cylindrical valve body having a pressure inlet 11 and a valve seat 12 at one end and a caulking portion 8 at the other end. A valve holder 3 having a valve body 2 attached to and separated from a valve seat 12 is movably provided with a fluid flow gap g between the valve body 2 and an inner wall surface of the valve chamber 9. In addition, a pressure equalizing hole 15 is formed in the center of the holder 3 to allow the fitting holding portion of the valve body 2 to communicate with the inside of the holder.

5 has a notch 16 in the periphery,
A spring 4 for urging the holder in the valve closing direction is incorporated between the plate 5 and the valve holder 3, and the valve body 2 is closed at a normal pressure value. In contact with the seat 12, the valve is closed as shown in FIG.

Reference numeral 7 denotes a disk-film-shaped cover sheet which is fitted into the caulking space between the main body 1 and the plate 5 with flexibility, abuts against the outer surface of the plate 5, and the outer periphery of the sheet and the inner diameter surface of the main body caulking. A ventilation gap 14 is formed between the pressure gap 10 and the pressure chamber 10 to release the pressure caused by the temperature rise in the valve chamber 9 to the outside.

The outer diameter of the seat 7 is smaller than the outer diameter of the plate 5 in view of the relation of insertion into the caulking space and the relation of maintaining the ventilation in the valve chamber 9, and comes into contact with the inner diameter surface 10 of the caulking by the blowing pressure. It has an outer diameter (outer diameter that is larger than the inner diameter of the opening end of the main body caulking portion 8) that does not come off from the opening groove of the caulking portion 8 due to the seal width necessary for the sealing and the various conditions such as vibration and weather resistance applied to the safety valve. The outer diameter and the thickness of the sheet 7 are set so that the sheet 7 can be blown off with a certain blowing pressure.

That is, since the sheet 7 needs to be deformed into a convex curved shape along the inner diameter surface 10 of the caulking due to the pressure of the fluid to be sealed, the sheet 7 is rich in flexibility and elastic, and has a thickness of 0.1 mm. A film-like sheet having a thickness of about 0.5 to 0.1 mm, for example, a polyester resin is a polyimide resin or the like, and a polymer material excellent in heat resistance, weather resistance, chemical resistance, and the like is used. It is effective to use a colored film for the sheet 7 so that the blown-off sheet can be easily discriminated.

Next, the operation of the safety valve will be described.

FIG. 2A shows that the valve opens due to abnormal pressure,
This shows a state in which the pressure in the valve chamber 9 rises to a certain pressure. The seat 7 receives the pressure in the valve chamber, abuts on the inner diameter surface 10 of the main body, and swells outward along the inner diameter surface 10 of the body. Deforms into a convexly curved shape.

FIG. 2B shows a state in which the pressure further rises and the sheet 7 is deformed to the inner diameter of the opening end of the caulking portion 8. In this state, the sheet 7 separates from the opening end of the caulking portion 8, and the outside air is blown by the blowing pressure. Completely blown to the side.

FIG. 2 (C) shows a normal pressure in which the body caulking inner diameter surface 10 and the seat 7 have a fluid flow gap (clearance) 14 with respect to the notch 16 of the plate 5, and the inside of the valve chamber 9 and the outside air are ventilated. The state at the time is shown.

[0024]

Since the safety valve of the present invention is constructed as described above, ventilation at normal pressure can be ensured by the ventilation gap 14 between the closing sheet 7 and the caulking inner diameter surface 10 of the main body. The sheet 7 has a cutout 13 as in the conventional example 1.
It is not necessary to provide the sheet 7 and the body caulking portion 8
Thus, a dustproof function in the valve chamber 9 can be achieved.

When the fluid pressure rises abnormally,
The closing sheet 7 for operation check is deformed into a convex curved shape along the inner diameter surface 10 of the caulking while being pressed by the pressure in the valve chamber, and finally loses the internal pressure and blows completely outward. Thus, an excellent practical effect such as that the valve opening operation due to the abnormal pressure can be accurately confirmed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a configuration of a safety valve according to an embodiment of the present invention. FIG. 1 (A) is a plan view of the safety valve, FIG. 1 (B) is a central longitudinal sectional view thereof, and FIG. The arrow sectional view which follows the aa line of the division figure (A).

FIG. 2 is an explanatory view of the operation of the safety valve, and is a sectional view (A).
Is a partially enlarged view showing the seat deformation state at the time of valve opening,
(B) is a partially enlarged view showing a state immediately before the sheet is blown off, and (C) is a partially enlarged view showing a closed state at normal pressure.

FIG. 3 is a configuration explanatory view showing a safety valve of Conventional Example 1 in a plan view of a divided view (A) and a central longitudinal sectional view of a divided view (B).

FIG. 4 is a configuration explanatory view of a safety valve according to Conventional Example 2,
FIG. 2A is a plan view of the safety valve, and FIG. 2B is a cross-sectional view taken along line bb in FIG.

[Explanation of symbols]

 1 Valve body 2 Valve body 3 Valve holder g Fluid flow gap 4 Spring 5 Plate 7 Closing sheet 8 Body caulking part 9 Valve chamber 10 Caulking inner diameter surface 11 Pressure inlet 12 Valve seat 14 Venting gap 16 Plate cutout

Claims (1)

[Claims] 1. A valve body having a pressure introduction port and a valve seat on one end side and a caulking portion provided on the other end side, and a valve body which comes into contact with and separates from the valve seat, and fluid flows through a valve chamber of the body. A valve holder movably provided with a gap, a plate having a notch in the periphery and fixed by caulking to the caulking portion of the main body, and a holder incorporated between the plate and the valve holder to close the holder; A safety valve provided with a spring which biases in a valve direction, wherein a flexible disk film having an outer diameter smaller than the outer diameter of the plate and larger than the inner diameter of the opening end of the main body swaging portion is provided in the swaging space between the main body and the plate. Is fitted to the outer surface of the plate while keeping a ventilation gap between the inner surface of the plate and the inner surface of the plate, and when the valve is opened due to an abnormal rise in fluid pressure, the seat is pressed by the valve chamber pressure. Shape into a convex curved shape along the inner diameter surface A safety valve characterized by being deformed and finally losing its internal pressure and blowing off to the outside.