JPS6128143Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a safety valve for a gas accumulator.

Conventionally, a safety valve installed in a gas storage device such as an accumulator that stores gas has a valve body d elastically biased by a coil spring c against a valve seat b configured on the gas storage device a side, as shown in Fig. 1. is pressed to form a kind of check valve, and the elastic force of the coil spring c is adjusted so that when the internal pressure of the gas accumulator a exceeds a predetermined pressure, it opens to reduce the internal pressure. . Therefore, if the valve body d stops sliding due to some reason such as galling with the housing e, etc., the safety valve itself will not operate, which will not only be extremely dangerous, but also reduce the response speed of valve opening and closing. This method has disadvantages such as being slow and not operating accurately with respect to the control pressure.

In view of the above problems, the present invention provides a safety valve for an air accumulator that has improved sealing performance, and even if the safety valve does not operate, if the pressure exceeds a predetermined value, the rupture disk will break and the preset valve pressure will be maintained. According to the present invention, the sealing performance is high and the operating pressure is accurate.

Hereinafter, one embodiment of the safety valve for a gas accumulator of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a housing, and a connecting portion 2 protruding from the lower end includes, for example, a gas accumulator 3.
A hub 4 is formed with a male screw 4a screwed into the end of the exhaust port 3a, and is airtightly connected via an O-ring 5. The hub 4
The communication hole 6 opened at 200 mm is connected to the inner side of end plugs 8 and 9 screwed to both ends of the operating hole 7 which runs through the housing 1, respectively, through communication holes 6a and 6b. They are screwed together in an airtight manner via rings 5a and 5b. The operating hole 7 consists of a cylinder hole 10 and a step hole 11, and a presser nut 12 inserted from the hole end is screwed into the female screw threaded in the step hole 11.
A rupture disc 13 made of a thin plate of phosphor bronze or the like and capable of bursting under a certain surface pressure is airtightly inserted between the end and the step 11a of the step hole 11, and is bored into the end of the holding nut 12. The provided cavity 12a and cylinder hole 1
Separate between 0. Further, the communication hole 6b is an annular space A formed between the presser nut 12 and the step hole 11.
The holding nut 12 has an opening therein and communicates with the cavity 12a through an orifice 12b formed in the shaft portion of the holding nut 12. A piston 14 is inserted into the cylinder hole 10 airtightly and slidably through an O-ring 15, and a crushing protrusion 16 having a pointed head 16a protrudes from the stepped hole 11 side of the piston 14. The coil spring 17 is provided between the piston 14 and the stepped portion 11a, and is always held on the end plug 8 side by appropriate elastic pressure. A small protrusion 14a is protruded from the rear end of the piston 14, and the small protrusion 14a
a comes into contact with the inner end of the end plug 8 to form a small gap B on the back surface of the piston 14, and the communication hole 6a opens into this small gap B. Further, 18 is an exhaust hole opened in the cylinder hole 10, and is located on the crushing protrusion 16 side of the piston 14.

The safety valve having the above structure is installed by connecting the connecting part 2 so as to receive the internal pressure of the gas accumulator including the accumulator. P and the internal pressure P of the cavity 12a of the holding nut 12 is formed. In the case of gas accumulator 3, the maximum allowable pressure (Pmax) is
Since the safety valve must open within 10%, the elastic load T of the coil spring 17 is set to be in the range of Pmax<T≦1.1Pmax. Further, the rupture disc 13 is formed to rupture at a pressure before the gas accumulator 3 is ruptured by the internal pressure P.

Therefore, when the internal pressure P of the gas accumulator 3 rises and becomes larger than the elastic load T of the coil spring 17,
Due to the back pressure of the piston 14, the piston 14 slides along the cylinder hole 10, and the rupture disc 13 is pierced by the tip 16a of the rupture protrusion 16, and the rupture disc 13 is opened from the fractured part of the rupture disc 13 into the cavity. The gas in 12a is released into the atmosphere through the cylinder hole 10 and the exhaust hole 18, and the cavity 12a, orifice 12b,
The internal pressure of the gas accumulator 3, which communicates with the annular space A through the communication holes 6b and 6, decreases.

Furthermore, in the safety valve having the above structure, if the piston 14 does not slide due to some reason such as galling of the piston 14 and the cylinder hole 10, the surface pressure resistance of the rupture disc 13 is set to be smaller than the internal pressure resistance of the gas accumulator 3. Therefore, before the gas storage device 3 is destroyed, the internal pressure P of the cavity 12a
Since it is crushed and opened by
is not destroyed by the internal pressure of the gas.

As explained above, the safety valve for a gas accumulator of the present invention is constructed so that the piston that slides under a predetermined internal pressure pierces the rupture disc provided in the sealing part. By changing the elastic load, the valve pressure of the safety valve can be adjusted. In addition, the safety valve of the present invention has a rupture disc in the sealing part, so even if the sealing pressure is high and the piston stops sliding for some reason, the rupture disc will be removed before the gas accumulator is destroyed. The practical effects of the present invention are extremely large, as it constitutes a double safety valve that can be shattered to ensure safety.

[Brief description of the drawings]

The drawings show an embodiment of the safety valve for a gas accumulator according to the present invention, and FIG. 1 is a front sectional view of a conventional safety valve, and FIG.
The figure is a front sectional view of the safety valve of the present invention, and FIG. 3 is a front sectional view showing the same operating state. DESCRIPTION OF SYMBOLS 1...Housing, 2...Connection part, 3...Air accumulator, 3a, 18...Exhaust port, 4...Hub, 4a...
...Male thread, 5, 5a, 5b, 15...O ring,
6, 6a, 6b...Communication hole, 7...Operating hole, 8,
9... End plug, 10... Cylinder hole, 11... Step hole, 11a... Step part, 12... Holder nut, 12
a... Luminous hole, 12b... Orifice, 13... Rupture disc, 14... Piston, 14a... Small projection, 1
6... Crushing protrusion, 16a... Point, 17... Coil spring, A... Annular space, B... Small gap.

Claims (1)

[Scope of utility model registration request] A rupture disc that can be ruptured by a predetermined surface pressure is inserted and fixed in an airtight manner into one end of a cylinder hole having an exhaust hole on one side into which a piston is slidably and airtightly inserted, and the rupture disc of the piston is A crushing protrusion is provided on the side, and a coil spring or the like is elastically installed between the piston and the cylinder hole on the rupture disk side to cause the piston to retreat with a predetermined elastic pressure, and the back surface of the piston and the back surface of the rupture disk are A safety valve for a gas accumulator, characterized in that a communication hole is opened from a connecting part.