CN2204904Y

CN2204904Y - Membrane breather valve

Info

Publication number: CN2204904Y
Application number: CN 94248538
Authority: CN
Inventors: 姚正顺
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-27
Filing date: 1994-12-27
Publication date: 1995-08-09
Anticipated expiration: 2004-12-27

Abstract

The utility model relates to a membrane breather valve, which is composed of a shell, a valve plate, and a valve seat, and is characterized in that a membrane is arranged in the shell. The middle part of the membrane is connected with a central tube which penetrates through a spring. The lower part of the valve plate is led downwards into a proper position in the inner part of a storage tank. The spring is positioned between the valve plate and the membrane. The valve plate opposite to the central tube can slide up and down. When vacuum degree in the storage tank reaches a prescribed value, the membrane passes through the central tube, pulls the valve plate upwards and opens the valve plate to lead a great amount of external gas fast to enter the storage tank, which can prevent that the tank is sucked to collapse.

Description

Membrane breather valve

The utility model relates to a kind of inhalation valve, especially for oil, and the inhalation valve of chemical product holding vessel.

The basic structure of now using inhalation valve as shown in Figure 4, Aspirating valves 1, exhaling (row) air valve 2 all is to conduct oneself with dignity by valve disc to control jar interior gauge pressure and degree of vacuum.With Aspirating valves 1 is example, when the valve disc aperture is very little, though oil tank is air-breathing, gettering quantity seldom, jar internal pressure rise speed can reduce the speed that build-up of pressure descends less than temperature, therefore a jar internal pressure also can continue to descend, have only the valve disc aperture of working as to acquire a certain degree, when pressure rise speed equaled the pressure rate of descent, this aperture claimed corresponding aperture, in corresponding aperture position, a jar internal pressure does not change within a certain period of time.And corresponding aperture is jar function of internal pressure rate of descent; the pressure rate of descent is slow more; the corresponding aperture that requires is more little; therefore when home condition and the oily operation of normal transmitting-receiving; the jar internal pressure descends very slow; the corresponding aperture that requires is also very little, as long as valve disc has less aperture, just can prevent that pressure from continuing to descend.Otherwise, the pressure rate of descent is fast more, the corresponding aperture that requires is also big more, the interior gas temperature of jar in summer can reach more than 40 ℃, if the bust heavy rain, gas can sharply shrink step-down in jar, this just requires valve disc that very big corresponding aperture is arranged, even the aperture that reaches capacity, and used inhalation valve does not satisfy the requirement of corresponding aperture under the action of gravity of valve disc, make actual aperture less than the corresponding aperture that requires.Make in the inflow jar that ambient air can not be in time a large amount of, form big vacuum during Shun in jar and surpass the ability to bear of oil tank, it is sunken to cause oil tank to be flattened, pit.

The purpose of this utility model is at the problems referred to above, adopts the diaphragm type inhalation valve to substitute existing pair of inhalation valve, and this valve can be at bust when raining heavyly, and it is quick to satisfy storage tank, and a large amount of air-breathing requirements prevent that tank body is excessive flat by suction because of vacuum.

The purpose of this utility model is achieved in that a kind of diaphragm type inhalation valve is by housing, valve plate and valve seat are formed, and it is characterized in that: a film is housed in housing, and the film middle part connects with center tube, center tube passes spring, feeds the appropriate location of tank inside after the valve plate downwards; Spring is between valve plate and film, and valve plate center tube relatively slides up and down.

Advantage of the present utility model is: when degree of vacuum reaches specified value in the jar, film is pulled upwardly valve plate by center tube and opens, ambient atmos is entered in the jar, again because of the film useful area greater than valve plate, therefore as long as jar in form a less vacuum, valve plate can be opened, make storage tank air-breathing as early as possible, make the ambient atmos can be rapidly, a large amount of enters in the jar, has prevented that tank body from being inhaled flat.

Concrete structure of the present utility model further specifies by following examples and accompanying drawing thereof:

Fig. 1 is closed condition figure of the present utility model

Fig. 2 is suction condition figure of the present utility model

Fig. 3 is exhaust condition figure of the present utility model

Fig. 4 is the schematic representation of prior art

Referring to Fig. 1: a kind of diaphragm type inhalation valve is by housing 3, valve plate 5 and valve seat 6 are formed, housing 3 is the garden plate-like, the bottom surface is provided with a lot of vents 31, its upper-end surface is connected with the middle enclosing cover 9 that has breathing mouth, breathing mouth 7 is provided with horizontal communication hole 71 and communicates with vertical vent 72, and an end of center tube 1 inserts in the vent 72, and can slide up and down in vent 72; Film 2 is the garden lamellar body, and its middle part is screwed onto with center tube 1 by double nut 8, and its outer periphery are clamped between housing 3 and the enclosing cover 9; Center tube 1 passes spring 4, feed the appropriate location of tank inside after the valve plate 5 downwards, gas in making jar can be along center tube 1, through vent 72,71 enter into the upper space of film 2, make film 2 upper surfaces experience tank inside pressure, and lower surface is experienced atmospheric pressure, and the useful area of film 2 is greater than the useful area of valve plate 5, and valve plate 5 center tube 1 relatively slides up and down.

Referring to Fig. 2: suction condition, when degree of vacuum in the storage tank increases, inside and outside differential pressure acts on the valve plate 5 on the one hand, make and close the increase of valve power, act on the other hand on the film 2, make film 2 epireliefs, draw valve plate 5 to increase valve opening force, because of film 2 useful area greater than valve plate 5, so along with the increase of degree of vacuum in the jar, valve opening force increases gradually.When degree of vacuum reached specified value, film 2 was pulled upwardly valve plate 5 by center tube 1 and opens, and ambient atmos is entered in the jar, as long as jar less vacuum of interior formation, valve plate 5 can be opened, and makes storage tank air-breathing as early as possible.In a single day valve plate 5 is opened, film 2 lower surfaces communicate with atmosphere immediately, and upper and lower surface pressure reduction reduces immediately, and pass valve power is reduced, and the pressure of film 2 upper surfaces, because of the throttling action of center tube 1 has little time to change, the power of opening after valve plate 5 is opened further increases, and then valve plate 5 is continued out greatly, until standard-sized sheet, thereby make the ambient atmos can be rapidly, a large amount of enters in the jar, prevents that tank body from being inhaled flat.

If pressure is greater than the external world in jar, referring to Fig. 3, when gauge pressure reached specified value on the film 2, film 2 downward concave crowns were in housing 3 bottom surfaces, and jar interior gas directly backs down valve plate 5, and pressure spring 4 is to extraneous exhaust, pressure equivalence inside and outside jar.

Claims

1, a kind of diaphragm type inhalation valve is by housing (3), valve plate (5) and valve seat (6) are formed, it is characterized in that: a film (2) is housed in housing (3), film (2) middle part connects with center tube (1), center tube (1) passes spring (4), and valve plate (5) feeds the appropriate location of tank inside afterwards downwards; Spring (4) is positioned between valve plate (5) and the film (2), and valve plate (5) center tube (1) relatively slides up and down;

2, diaphragm type inhalation valve according to claim 1, it is characterized in that: housing (3) is the garden plate-like, the bottom surface is provided with a lot of vents (31), its upper-end surface is connected with the middle enclosing cover (9) that has breathing mouth, breathing mouth (7) is provided with horizontal communication hole (71) and communicates with vertical vent (72), one end of center tube (1) inserts in the vent (72), and can slide up and down in vent (72).

3, diaphragm type inhalation valve according to claim 1 is characterized in that: film (2) is the garden lamellar body, and its middle part is screwed onto with center tube (1) by double nut (8), and its outer periphery are clamped between housing (3) and the enclosing cover (9);

4, diaphragm type inhalation valve according to claim 3 is characterized in that: the useful area of film (2) is greater than the useful area of valve plate (5).