CN2296153Y - Seal rubber ring capable of preventing pressure cooker from explosion - Google Patents

Abstract

The utility model relates to a sealing rubber ring which is capable of preventing pressure cooker from explosion. A plurality of uniformly distributed arc-shaped inward bow-shaped notches are arranged on the outer circle of the sealing rubber ring. The cross sections of the bow-shaped notches are Y shapes. When the pressure in the cooker is greater than the safe pressure, the bow-shaped notches have the function. The sealing rubber ring arranged at the bow-shaped notches has the deformation under the action of the overpressure pressure, so a lip part of the sealing rubber ring is disengaged from a sealing surface of the pressure cooker. Thus, the gas can be discharged, the pressure can be lowered down, and the explosion accident of the pressure cooker can be avoided. The utility model has no influence on the sealing performance and the service life in a normal use state. The utility model can be used without additional arrangement of any device and structure.

Description

A kind ofly can make the not quick-fried O-ring seal of pressure cooker

The utility model relates to a kind of gasket cement of pressure cooker circle, particularly a kind of can losing heart voluntarily when pot inner pressure surpasses safe pressure and O-ring seal that pressure cooker is not blasted.

The shape of existing gasket cement of pressure cooker circle is a complete annular, and its cross section is " Y " shape.After closing lid and putting in place, pot inner pressure rises to 20kpa when above, and O-ring seal is in sealing state all the time.When pot inner pressure during at nominal operating pressure 0.9-1.1 times, pressure limiting valve begins intermittently exhaust, constant pressure; When pressure limiting valve breaks down or blast pipe is blocked, when pot inner pressure rose to safe pressure, the safety valve step-down of just losing heart was no longer risen pot inner pressure; When blast pipe, when the golden valve port of peace is blocked simultaneously, pot inner pressure rises just uncontrollable, explodes until pressure cooker.In order to prevent that this accident from taking place, existing many enterprises develop the blast resistance construction of pressure cooker, and for example: what have offers window on the pot cover side; Have when offering window, also on the step surface of pot cover, punch; What have outwards protrudes one section with part, pot cover side, again pot body tooth portion spill place is increased breach.The principle of these structures all utilizes sealing ring to be extruded the aperture when overvoltage and pressure release can be played explosion-proof, but manufacturing process is cumbersome, and product appearance also is affected.

The purpose of this utility model provides a kind of novel pressure cooker O-ring seal that pressure energy loses heart voluntarily of crossing.

The utility model is intended to change the shape of existing gasket cement of pressure cooker circle, solves the blast problem of pressure cooker.

The utility model is achieved in that on the cylindrical of existing gasket cement of pressure cooker circle, increases the inside arcuate indentation of several arcs.Certainly adopt other concave indentation that is similar to arcuate indentation also to be fine.The O-ring seal that has these breach is contained on the pressure cooker, and indentation, there can be out of shape under normal operating condition, and sealing is reliable; When accident in use appears in pressure cooker, when pot inner pressure surpasses safe pressure, the O-ring seal compressive deformation of these indentation, there expands outwardly, and causes the sealing surface of the corresponding separating pressure pot of this place's O-ring seal lip and the step-down of losing heart, and avoids the generation of pressure cooker blast thing drum.The degree of depth of breach is generally decided according to pressure release pressure design value and material hardness value on the O-ring seal.The degree of depth of breach can influence the distance of O-ring seal compressive deformation, and the degree of depth is dark more, and pressure release pressure is more little; The degree of depth is shallow more, and pressure release pressure is big more.The hardness number of cushion rubber can influence pressure release pressure equally, and hardness height, O-ring seal are not yielding, otherwise then yielding.O-ring seal hardness number of the present utility model, it is proper to be adjusted at Shao Shi 60-65 degree, and the 2.2-3.5 that pressure release pressure is adjusted at nominal operating pressure is proper between doubly.This O-ring seal excircle dimension is than the little 0.5-1.5mm of existing O-ring seal, still can guarantee the normal performance of function when being convenient to the cushion rubber excircle dimension and in use changing.

The utility model needn't increase any device and structure on pressure cooker, just the shape of O-ring seal being done some changes cleverly, do not influence the sealing and the service life of O-ring seal, but can fundamentally solve the blast problem of pressure cooker, it not only can be on the pressure cooker of making from now on adapted, and can increase the safety in utilization of pressure cooker greatly at adapted on pressure cooker at present, its economic benefit and social benefit are apparent.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is a front view of the present utility model.

Fig. 2 is the cutaway view Amplified image of A-A among the utility model Fig. 1.

1, O-ring seal; 2, arcuate indentation (situation just often); 3, lip; 4, arcuate indentation (situation during overvoltage)

With revolving type 24cm pressure cooker " Y " shape O-ring seal is example: on the cylindrical of O-ring seal (1), make 6 uniform arcuate indentation (2), the degree of depth of arcuate indentation (2) is 5mm, and arc radius is 25mm, and the excircle dimension of O-ring seal (1) is 270mm.O-ring seal (1) is contained in the pressure cooker, and under normal operating condition, arcuate indentation (2) can be out of shape, and lip (3) sealing is reliable; Under unexpected situation, superpressure in the pot, arcuate indentation (2) is deformed into the situation of arcuate indentation (4), and this place's lip (3) is outwards extruded a segment distance by pot inner pressure, seals destroyedly, and the pressure cooker step-down of losing heart realizes explosion-proof function.After pot inner pressure was removed, the arcuate indentation (4) on the O-ring seal (1) reverted to the shape of arcuate indentation (2) voluntarily.

Claims (3)

1, a kind ofly can make the not quick-fried O-ring seal of pressure cooker, it is characterized in that having the inside arcuate indentation of arc (2) on the cylindrical of O-ring seal (1).

2, according to claim 1ly can make the not quick-fried O-ring seal of pressure cooker, it is characterized in that: the cross section of O-ring seal (1) is " Y " shape.

3, describedly can make the not quick-fried O-ring seal of pressure cooker according to claim 1,2, it is characterized in that: the quantity of arcuate indentation (2) is 3-12, and is uniform on circumference.