Relievable safety press gauge

The present disclosure discloses a relievable safety press gauge. The relievable safety press gauge comprises a fixed mount comprising a rotation body and a crimped edge provided at an edge of lower end of the body, a base provided at a bottom of the fixed mount, and an edge of upper end of the base wrapped and fixed by the crimped edge, and a membrane, an edge of which is located between an edge of lower end of the body and the edge of upper end of the base; further comprising an O-ring made of rubber or silicone provided between an edge of the membrane and the edge of upper end of the base, and the crimped edge is provided with a hollow-out pressure release gap, a first release clearance is provided between the edge of upper end of the base and the edge of the membrane, while a second release clearance is provided between the edge of upper end of the base and the crimped edge. The present disclosure can automatically depressurize when the applied pressure is excessive, to increase the safety of the press gauge.

TECHNICAL FIELD

The present disclosure pertains to the field of press gauge product, and specifically to a relievable safety press gauge.

BACKGROUND

Press gauge is mainly used for pressure monitoring in closed environments. The test range of a press gauge used for barometric pressure measurement is usually from 0 to 30 Kg/cm2, while the upper limit of test range of a press gauge for oil pressure measurement can reach or even exceed 3000 Kg/cm2, such that the upper limit of the test ranges of the latter could be up to 100 times that of the former. When user is not clear about the application range of the press gauge itself, it may cause press gauge to rupture or even lead to an explosion due to excessive applied pressure. The press gauge in the prior art, such as the Chinese Taiwan Patent Application No. 098208087, discloses a press gauge structure which is difficult to guarantee the safety of the press gauge due to a lack of a pressure relief protection structure. In addition, the base of press gauge structure in the patent above is made of zinc-aluminum alloy, thus the production and processing efficiency is low, while the cost is high; and a membrane in the press gauge structure is fixed through screw at its centre, which increases the thickness of the press gauge. The shortcomings above need to be further improved.

SUMMARY

To overcome shortcomings in the prior art, the present disclosure provides a relievable safety press gauge, which can automatically depressurize when the applied pressure is excessive, to increase the safety of the press gauge.

The technical scheme of the disclosure for solving the problem is as follow:

A relievable safety press gauge, comprising:

a fixed mount comprising a rotation body and a crimped edge provided at an edge of lower end of the body;

a base provided at a bottom of the fixed mount, and an edge of upper end of the base wrapped and fixed by the crimped edge; and

a membrane, an edge of which is located between an edge of lower end of the body and the edge of upper end of the base;

wherein it further comprises an O-ring made of rubber or silicone provided between an edge of the membrane and the edge of upper end of the base, and

the crimped edge is provided with a hollow-out pressure release gap, a first release clearance is provided between the edge of upper end of the base and the edge of the membrane, while a second release clearance is provided between the edge of upper end of the base and the crimped edge.

As a further improvement of the above mentioned technical scheme, the base is formed by stamping, and the base comprises an annular portion for fitting with the fixed mount and a cylindrical portion for fixedly mounting, a bottom of the cylindrical portion is provided with a ventilated through hole, and an outward of the cylindrical portion is provided with a mounting thread or a mounting slot.

As a further improvement of the above mentioned technical scheme, the inward of the fixed mount is provided with a rotary member, which is provided at an axis of the fixed mount, and a lower end of the rotary member is connected to a centre of the membrane by rivet.

Compared to the prior art, the disclosure has the beneficial effects as below:

The disclosure provides a relievable safety press gauge, when the applied pressure exceeds the application range of the press gauge, the pressure of the internal O-shaped environment breaks through the sealing of the O-ring, escapes from the first release clearance and the second release clearance, and leaks from the pressure release gap to the external environment, in order to achieve the protection of the press gauge, i.e. an explosion-proof function, to increase the safety of the use of press gauges. In addition, the base structure is optimized so that it can be stamping forming, which will help reducing production and processing costs of the press gauge, and improve production and processing efficiency. In addition, by using the rivet to connect the rotary member to the membrane instead of the thread connection in the prior art, it can reduce the thickness of the press gauge.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referred toFIGS. 1-4,FIG. 1-4are schematic structural diagrams of a specific embodiment of the present disclosure.

As shown in Figures, a relievable safety press gauge comprising: a fixed mount10comprising a rotation body11and a crimped edge12provided at an edge of lower end of the body11, a base20provided at a bottom of the fixed mount10, and an edge of upper end of the base20wrapped and fixed by the crimped edge12, and a membrane30, an edge of which is located between an edge of lower end of the body11and the edge of upper end of the base20; further comprising an O-ring40made of rubber or silicone provided between an edge of the membrane30and the edge of upper end of the base20, and the crimped edge12is provided with a hollow-out pressure release gap13, a first release clearance21is provided between the edge of upper end of the base20and the edge of the membrane30, while a second release clearance22is provided between the edge of upper end of the base20and the crimped edge12. When the applied pressure exceeds the application range of the press gauge, the pressure of the internal O-shaped environment breaks through the sealing of the O-ring40, escapes from the first release clearance21and the second release clearance22, and leaks from the pressure release gap13to the external environment, in order to achieve the protection of the press gauge, i.e. an explosion-proof function.

As a further improvement, the base20is formed by stamping, and the base20comprises an annular portion23for fitting with the fixed mount10and a cylindrical portion24for fixedly mounting, a bottom of the cylindrical portion24is provided with a ventilated through hole25, and the outward of the cylindrical portion24is provided with a mounting thread26, or a mounting slot27as shown inFIG. 4. The above structure makes the base20capable of stamping forming, which will help reducing production and processing costs of the press gauge, and improve production and processing efficiency.

As a further improvement, the inward of the fixed mount10is provided with a rotary member50, which is provided at the axis of the fixed mount10, and a lower end of the rotary member50is connected to a centre of the membrane30by rivets51. By using the rivet51to connect the rotary members50to the membrane30instead of the thread connection in the prior art, it can reduce the thickness of the press gauge.

The above descriptions are merely preferred embodiments of the present disclosure, of course, the disclosure may be implemented in a different form from the above-described embodiment. It will be understood by those skilled in the art that equivalents or corresponding modification without departing from the spirit of the disclosure may be made within the scope of the present disclosure.