CN2331808Y

CN2331808Y - Pressure-release valve

Info

Publication number: CN2331808Y
Application number: CN 97245398
Authority: CN
Inventors: 田亚东; 伍立中
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-09-24
Filing date: 1997-09-24
Publication date: 1999-08-04
Anticipated expiration: 2007-09-24

Abstract

The utility model relates to the structural improvement of a pressure relief valve. The utility model is characterized in that a proximity type electrical signal switch is arranged on a valve body, a directional draining port is arranged on one side of the valve body, a spring is arranged between an adjustable screw cap on the valve body and a valve cover, a guide sleeve is arranged outside the valve cover, a metal flat pad which is arranged at the bottom of the valve cover is contacted with a rubber pad with a sharp part on a valve seat, and a cavity is formed among the guide sleeve, the rubber pad and the metal flat pad. The utility model is suitable for totally enclosed electric apparatus and devices, and has the advantages of good anti-rain and anti-explosion performances, adjustable opening forces for the valve, etc.

Description

Pressure relief valve

The utility model relates to the improvement of pressure relief valve structure, and it is applicable to iknsulating liquid or gas to be the overvoltage protection of the fuel tank such as inductor, voltage device, capacitor, high-voltage switch gear, load ratio bridging switch of cooling medium.

Present pressure relief valve is to contact with the arc valve gap with the O RunddichtringO on the valve seat, with the liquid in this leakproof fuel cell, and adopts contact type electric signal switch, and the regulator of directed drain tap and valve gap is not set.Its shortcoming is as follows:

1, have Leckage:

Existing pressure relief valve is to contact with the arc of O RunddichtringO with valve gap, when having sum of errors to scratch slightly, the valve gap of arc just influenced sealing effect, and the precision of the arc shaped surface of valve gap and degree of finish is difficult to guarantee in the manufacturing process, therefore, and easily at the contacting point oil impregnate.So pressure relief valve is not suitable for hermetic electric device at present.

2, the electrical signal switch is rainproof, explosion-proof performance is poor:

Existing pressure relief valve adopts contact type electrical signal switch, and its poor sealing can not can not reach rainproof, explosion-proof purpose for a long time at outside work; Be that directed drain tap is not set again, when draining, oil is excessive around the pressure valve, befouling environment not only, and the more important thing is to fire and cause a hidden trouble;

3, adjustable under the cracking pressure of valve

Because valve gap formula valve seat is not provided with the cracking pressure regulating device, but level pressure power selection pressure relief valve, limited the using scope of pressure relief valve, bring very big inconvenience to the user.

The purpose of this utility model be exactly at above-mentioned with topic, carry that it is a kind of applicable to the fully-sealed electric device of air, and have fine rainproof, explosion-proof performance, the pressure relief valve of adjustable in pressure.

The purpose of this utility model is to realize like this, the utility model comprises valve body, the bottom of valve body is valve gap, valve seat, sealing gasket, its structure outline is that valve body is provided with proximity electrical signal switch, the side of valve body is provided with directed drain tap, is provided with spring between adjustable nut on the valve body and the valve gap, and valve gap is outside equipped with guide sleeve, the bottom metal plain cushion of valve gap contacts with the rubber cushion with tip on the valve seat, forms empty chamber between guide sleeve, rubber cushion, metal plain cushion.

Major advantage of the present utility model:

1, applicable to the fully-sealed electric apparatus:

Because the plane of the bottom metal packing ring of valve gap contacts with the rubber cushion with tip on the valve seat, just can make the plane mutually fully contact of rubber cushion with the metal plain cushion, not only make the oil in the cooling fuel tank not leak (can reach 20 years and can not leak oil), and be easy to improve control valve accurately the opening time (because surface of contact is more little, opening type cut-off valve pressure reduction is little), the time that makes the opening type cut-off valve is less than 1.7 milliseconds, so the utility model pressure relief valve is more suitable in hermetic electrical installations;

2, have rainproof well, explosion-proof performance:

The utility model valve body is provided with proximity electrical signal switch, because this switch has good sealability, can prevent that rainwater from entering in the electrical signal switch, influences proper functioning; Be provided with directed drain tap in the valve body side, only make the oil that releases obtain reclaiming down, and it be excessive effectively to prevent to release oil, has eradicated disaster hidden-trouble everywhere;

3, the cracking pressure of valve is adjustable:

Owing between adjusting nut on the valve body and valve gap, be provided with spring, when the turn adjustable nut, just can change the pressure of spring to valve seat, promptly adjusted the cracking pressure of valve, to adapt to user's needs.

Fig. 1 is a structural representation of the present utility model:

Fig. 2 is the structural representation of valve gap, valve seat and relevant part;

Fig. 3 is the local enlarged diagram among Fig. 2;

Fig. 4 is the bonding state schematic representation of metal flat packing ring when not compressing with rubber cushion;

Fig. 5 is the structural representation of guide sleeve.

Fig. 6 is the plan view of Fig. 5.

Knot platform accompanying drawing is described further concrete structure of the present utility model below:

The utility model comprises valve body 12, mechanical mark post 13, the bottom of valve body 12 is valve gap 7, valve seat 2, sealing gasket 1, valve body 12 is provided with proximity electrical signal switch 14 (can adopt two wires inductance type proximity switch), the side of valve body 12 is provided with and is provided with spring 10 valve gaps 7 between adjustable nut 11 on directed drain tap 9, the valve body 12 and the valve gap 7 and is outside equipped with guide sleeve 8, the metal plain cushion 6 of the bottom of valve gap 7 contacts with the rubber cushion with tip 43 on the valve seat 2, and forming between guide sleeve 8, rubber cushion 3, metal plain cushion 6 is free chamber 5.

4 cross sections, tip can be triangle 16, and the inner edge 17 of triangle 16 is less than outside 15; When rubber cushion 3 was compressed, inwardly fell tip 4, has strengthened the sealing of rubber cushion 3; The top of tip 4 can be fillet, makes rubber cushion 3 not fragile.

The apex angle of tip 4 can be 80-85 °, and the outside 15 of triangle 16 is 15-20 ° with angle β between the plain cushion 6.

Preferably with metal plain cushion 6 with rubber cushion 3 contacted plane lappings, can guarantee its sealability.

Also can be provided with pressure transducer 18 by valve gap 7, open and close to assist valve gap 7 accurately to press.

Claims

1, pressure relief valve comprises valve body (12), machinery mark post (13), the bottom of valve body (12) is valve gap (7), valve seat (2), sealing gasket (1), it is characterized in that valve body (12) is provided with proximity electrical signal switch (14), the side of valve body (12) is provided with directed drain tap (9), be provided with spring (10) between adjustable nut (11) on the valve body (12) and the valve gap (7), valve gap (7) is outside equipped with guide sleeve (8), the rubber cushion with tip (4) (3) on the same valve seat of metal plain cushion (6) (2) of the bottom of valve gap (7) contacts, in guide sleeve (8), rubber cushion (3), form empty chamber (5) between the metal plain cushion (6).

2, pressure relief valve according to claim 1 is characterized in that cross section, tip (4) is triangle (16), and the inner edge (17) of triangle (16) is less than outside (15).

3, pressure relief valve according to claim 1 and 2 is characterized in that tip angle α is 80-85 °, and the outside (15) of triangle (16) is 15-20 ° with angle β between the metal plain cushion (6).