Explosion venting manhole valve

Abstract

The utility model discloses an explosion venting manhole valve which comprises a flange seat, a pressure relief sealing plate, a negative pressure sealing plate, a pressure relief guide rod and a negative pressure guide rod. Connecting bosses are arranged outside the flange base, each connecting boss is provided with a pressure relief guide rod, the lower end and the upper end of each pressure relief guide rod penetrate through the corresponding connecting boss and the corresponding pressure relief sealing plate and then are fixed through a limiting nut, the upper end of each pressure relief guide rod is sleeved with a spring, and the two ends of each spring abut against the corresponding limiting nut and the corresponding pressure relief sealing plate respectively. A hollowed-out plate is arranged in the center of the pressure relief sealing plate, the lower end of the negative pressure guide rod penetrates through the hollowed-out plate to be connected with the negative pressure sealing plate, a limiting nut is arranged at the upper end of the negative pressure guide rod, the upper end of the negative pressure guide rod is sleeved with a spring, and the two ends of the spring abut against the limiting nut and the hollowed-out plate respectively. The device is simple in overall structure, is arranged at the manhole of the low-pressure tank body, is adjustable in high pressure and negative pressure, and is high in sensitivity; the elastic force of the spring can be adjusted by adjusting the height of the limiting nut, so that the purpose of adjusting the pressure threshold value is achieved, and the pressure adjusting range of the pressure adjusting valve is enlarged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a manhole valve, in particular to a kind of explosion vent manhole valve. BACKGROUND

[0002] ‌Pressure vessel tank is generally used in chemical industry, the pressure tank is kept stable when using the pressure in tank body, cannot be too high also cannot be too low, the pressure in tank body is too high and can occur tank body explosion, conversely, the pressure in tank body is too and can form negative pressure and lead to tank body suction flat.For avoiding this situation to occur, pressure regulating device is set on tank body, but pressure vessel tank is divided into high-pressure tank and low-pressure tank, and pressure regulating device is often applicable to high-pressure tank body, for low-pressure tank, pressure regulating device sensitivity is not enough, and pressure cannot be well adjusted, so the pressure regulating effect of current many low-pressure tank pressure regulating device is not good. SUMMARY

[0003] In view of the above problems of prior art, the utility model provides a kind of explosion vent manhole valve, applicable to low-pressure tank body, and sensitivity is high, and pressure regulating effect is good.

[0004] To achieve the above object, the utility model provides the following technical scheme: including flange seat, pressure relief sealing plate, negative pressure sealing plate, pressure relief guide rod and negative pressure guide rod;At least two connecting bosses are symmetrically arranged in the middle position of the outer side surface of flange seat, one pressure relief guide rod is respectively arranged corresponding to each connecting boss, the lower end of pressure relief guide rod is fixed after passing through connecting boss by limiting nut, the upper end is fixed after passing through pressure relief sealing plate by limiting nut, the part between the upper end limiting nut of pressure relief guide rod and pressure relief sealing plate is sleeved with spring, and the two ends of spring are respectively abutted against limiting nut and pressure relief sealing plate;

[0005] The center position of pressure relief sealing plate is hollow plate, the lower end of negative pressure guide rod is connected with the center of negative pressure sealing plate after passing through the center of hollow plate, the upper end of negative pressure guide rod is equipped with limiting nut, and the part between the upper end limiting nut of negative pressure guide rod and hollow plate is sleeved with spring, and the two ends of spring are respectively abutted against limiting nut and hollow plate.

[0006] Further, the contact surface of the negative pressure sealing plate and the pressure relief sealing plate is provided with a sealing ring.

[0007] Further, the upper end surface of the flange seat is provided with a sealing ring.

[0008] Further, it further includes rainproof cap, rainproof cap covers the upper of pressure relief sealing plate, and pressure relief guide rod passes through the side of rainproof cap.

[0009] Compared with prior art, the utility model is simple in overall structure, is arranged at low-pressure tank body manhole, high pressure and negative pressure can be adjusted, and sensitivity is high;And the height of limiting nut can be adjusted to adjust the spring force, so as to realize the purpose of adjusting pressure threshold, increase the range of pressure regulating of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the whole structure schematic view of the utility model;

[0011] In the drawing: 1, flange seat, 2, pressure relief sealing plate, 3, negative pressure sealing plate, 4, connecting boss, 5, pressure relief guide rod, 6, negative pressure guide rod, 7, spring, 8, limiting nut, 9, sealing ring, 10, hollow plate, 11, rainproof cap, 12, mounting hole. DETAILED DESCRIPTION

[0012] The utility model will be further described below in combination with the drawings.

[0013] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0014] As Figure 1 Indicated, the utility model provides a technical scheme: including flange seat 1, pressure relief sealing plate 2, negative pressure sealing plate 3, pressure relief guide rod 5 and negative pressure guide rod 6;The middle position of the outer side of flange seat 1 is symmetrically provided with at least two connecting bosses 4 for installing pressure relief guide rod 5, one pressure relief guide rod 5 is provided respectively corresponding each connecting boss 4, the lower end of pressure relief guide rod 5 passes through connecting boss 4 and is fixed by limiting nut 8, the upper end passes through pressure relief sealing plate 2 and is fixed by limiting nut 8, the part between the upper end limiting nut 8 of pressure relief guide rod 5 and pressure relief sealing plate 2 is covered with spring 7, and the both ends of spring 7 are respectively against limiting nut 8 and pressure relief sealing plate 2;Under normal conditions, pressure relief sealing plate 2 is pressed downward by spring 7 elasticity, so that the bottom surface of pressure relief sealing plate 2 is tightly attached to the upper end surface of flange seat 1;In order to improve the sealing effect, the upper end surface of flange seat 1 is provided with sealing ring 9.

[0015] The center position of pressure relief sealing plate 2 is hollow plate 10, and the lower end of negative pressure guide rod 6 passes through the center of hollow plate 10 and is connected with the center of negative pressure sealing plate 3, and the upper end of negative pressure guide rod 6 is provided with limiting nut 8, and the part between the upper end limiting nut 8 of negative pressure guide rod 6 and hollow plate 10 is covered with spring 7, and the both ends of spring 7 are respectively against limiting nut 8 and hollow plate 10;Under normal conditions, negative pressure sealing plate 3 is lifted upward by spring 7 elasticity, so that the top surface of negative pressure sealing plate 3 is tightly attached to the bottom surface of hollow plate 10 and part of pressure relief sealing plate 2;In order to improve the sealing effect, sealing ring 9 is arranged on the contact surface between negative pressure sealing plate 3 and pressure relief sealing plate 2.

[0016] The flange base 1 is the support and installation body of the whole device, the bottom end surface of the flange base 1 is provided with a plurality of mounting holes 12 for fixed connection with the low-pressure tank body, when the pressure in the tank body increases to a certain extent, the pressure will overcome the elastic force of the spring 7 on the pressure relief guide rod 5 to push the pressure relief sealing plate 2 upward, so that the pressure relief sealing plate 2 is separated from the upper end surface of the flange base 1, and the gas is released from the gap, after the pressure in the tank body is released, the elastic force of the spring 7 on the pressure relief guide rod 5 again presses the pressure relief sealing plate 2 downward, so that the bottom surface of the pressure relief sealing plate 2 is tightly attached to the upper end surface of the flange base 1 to realize sealing, thus the purpose of releasing the pressure in the tank body is achieved.

[0017] If negative pressure occurs in the tank body, the negative pressure will overcome the elastic force of the spring 7 on the negative pressure guide rod 6 to suck the negative pressure sealing plate 3 downward, so that the negative pressure sealing plate 3 is separated from the pressure relief sealing plate 2, and the gas enters the tank body through the hollow plate 10, under the action of the elastic force of the spring 7 on the negative pressure guide rod 6, the negative pressure sealing plate 3 is lifted upward again, so that the negative pressure sealing plate 3 is tightly attached to the pressure relief sealing plate 2 to realize sealing, thus the purpose of adjusting the negative pressure is achieved.

[0018] By adjusting the height of the limiting nut 8, the elastic force of the spring 7 can be adjusted, so that the purpose of adjusting the pressure is achieved.

[0019] In order to be suitable for outdoor use, a rainproof cap 11 is additionally provided, the rainproof cap 11 covers the upper part of the pressure relief sealing plate 2, and the pressure relief guide rod 5 penetrates through the side edge of the rainproof cap 11, when it rains or snows, the rainproof cap 11 can block the rain and snow, so that the rain and snow cannot enter the low-pressure tank body.

[0020] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0021] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any slight modification, equivalent replacement and improvement made according to the technical essence of the present application to the above embodiments should be included in the protection scope of the technical scheme of the present application.

Claims

1. A venting manhole valve, characterized in that, The flange seat (1), the pressure relief cover plate (2), the negative pressure cover plate (3), the pressure relief guide rod (5) and the negative pressure guide rod (6) are included; at least two connecting bosses (4) are symmetrically arranged at the middle position of the outer side of the flange seat (1), one pressure relief guide rod (5) is arranged corresponding to each connecting boss (4), the lower end of the pressure relief guide rod (5) is fixed through the connecting boss (4) and the limiting nut (8), the upper end is fixed through the pressure relief cover plate (2) and the limiting nut (8), the part between the upper end limiting nut (8) of the pressure relief guide rod (5) and the pressure relief cover plate (2) is sleeved with the spring (7), and the two ends of the spring (7) abut against the limiting nut (8) and the pressure relief cover plate (2) respectively; The center of the pressure relief cover plate (2) is a hollow plate (10), the lower end of the negative pressure guide rod (6) is connected with the center of the negative pressure cover plate (3) after penetrating through the center of the hollow plate (10), the upper end of the negative pressure guide rod (6) is provided with the limiting nut (8), the part between the upper end limiting nut (8) of the negative pressure guide rod (6) and the hollow plate (10) is sleeved with the spring (7), and the two ends of the spring (7) abut against the limiting nut (8) and the hollow plate (10) respectively.

2. A venting manhole valve according to claim 1, characterized in that: The contact surface of the negative pressure cover plate (3) and the pressure relief cover plate (2) is provided with the sealing ring (9).

3. A venting manhole valve according to claim 1, characterized in that: The upper end surface of the flange seat (1) is provided with the sealing ring (9).

4. A venting manhole valve according to claim 1, characterized in that: The rainproof cap (11) is further included, the rainproof cap (11) covers the upper part of the pressure relief cover plate (2), and the pressure relief guide rod (5) penetrates through the side edge of the rainproof cap (11).

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