Breathing safety valve for tank

Abstract

The utility model relates to a breathing safety valve for a tank. The breathing safety valve comprises a valve body, a gland, an upper valve core, a main spring, a lower valve core and an auxiliary spring, the utility model mainly aims to provide a lower valve core structure for solving the negative pressure state of the tank body on the basis of the unidirectional moving upper valve core, when the lower air hole is in an overpressure state, the upper valve core is pushed to move upwards and be far away from the upper air hole under the action of air pressure, the safety valve is opened, and air in the tank body is discharged from the upper air hole; when the lower air hole is in a negative pressure state, the lower valve element moves downwards and is far away from the upper valve element under the action of air pressure, the safety valve is opened to enable external air to enter the tank body, the problem of overpressure or negative pressure of the tank body is solved, and the service life of the tank body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a breathing safety valve for a tank. Background Art

[0002] Safety valves are widely installed on tanks. When the inside of the tank is in an overpressure state, the valve core in the safety valve is pushed open by the action of air pressure, making the safety valve open. When the air pressure value is within the safety threshold, the safety valve closes, thereby balancing the pressure inside the tank and preventing the tank from cracking due to overpressure. Since the valve core of a traditional safety valve moves in one direction, a single safety valve cannot solve the problem of negative pressure inside the tank at the same time, causing the tank surface to sag and collapse due to negative pressure. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a breathing safety valve for a tank, comprising a valve body, a pressure cover, an upper valve core, a main spring, a lower valve core and a secondary spring, the valve body being detachably connected to the pressure cover, the pressure cover and the valve body being respectively provided with an upper air hole and a lower air hole that are connected to each other, the valve body being abutted against the upper valve core for blocking the lower air hole, and a main spring being provided between the upper valve core and the pressure cover, the upper valve core being provided with an air hole for balancing the air pressure, a lower valve core being provided at the bottom of the upper valve core for blocking the air hole, and the lower valve core being provided with a valve stem for sliding connection to the upper valve core, and a secondary spring being provided between the valve stem and the upper valve core.

[0004] By adopting the above technical solution, when the lower air hole is in an overpressure state, the upper valve core is pushed upward and away from the upper air hole under the action of air pressure, and the main spring is compressed, and the gas in the tank body is discharged from the upper air hole to prevent the tank body from being damaged due to overload; when the lower air hole is in a negative pressure state, the lower valve core is moved downward and away from the upper valve core under the action of air pressure, and the secondary spring is compressed, and the external gas flows to the lower air hole through the upper air hole and the air vent, to prevent the tank body from being dented and deformed due to negative pressure; when the air pressure at the lower air hole is at a safety threshold, the main spring / secondary spring drives the upper valve core / lower valve core to reset, so that the tank body still maintains structural stability under overpressure and negative pressure conditions.

[0005] The utility model is further configured such that the upper valve core is provided with a sealing gasket for blocking the lower air hole, the valve body is provided with a bottom plane abutting against the sealing gasket at the lower air hole, and the upper valve core is sealed and connected to the valve body through the sealing gasket.

[0006] Furthermore, an outer ring portion abutting against a sealing gasket is provided on the outer side of the lower valve core, the air vent is provided on the inner side of the outer ring portion, and the lower valve core is sealed and connected to the upper valve core through the outer ring portion.

[0007] Furthermore, the upper valve core is provided with a sliding hole for slidingly connecting to the valve stem, the top of the valve stem is provided with a retaining ring, and the auxiliary spring is provided between the retaining ring and the upper valve core.

[0008] By adopting the above technical solution, the upper valve core and the lower valve core share the same sealing gasket, reducing the required sealing accessories and lowering costs. The retaining ring is a retaining spring part, and a slot is provided on the top of the valve stem. The retaining ring is installed in a snap-fit ​​manner through the slot, so that the two ends of the spring respectively abut against the retaining ring and the upper valve core. The overall design is reasonable and the structure is simple.

[0009] The utility model is further configured such that the gland is provided with a threaded column, the valve body is provided with an internal thread adapted to the threaded column, the gland is threadably connected to the valve body via the threaded column, a main spring is sleeved in the valve body, and the main spring is provided between the threaded column and the upper valve core.

[0010] Furthermore, a mounting portion for externally connecting to a tank body is provided at the bottom of the valve body, and a sealing groove for filling a sealing ring is provided at the mounting portion.

[0011] By adopting the above technical solution, the valve body is installed on the tank body through the mounting part by using a flange / clamp. The internal filter element accessories of the safety valve can be disassembled or installed by rotating the pressure cap. The disassembly and assembly method is simple and quick, and regular cleaning is achieved to prevent cross contamination of materials inside the tank body.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] On the basis of the one-way movable upper valve core, a lower valve core structure is provided for solving the negative pressure state of the tank body. When the lower air hole is in an overpressure state, the upper valve core is pushed upward and away from the upper air hole under the action of air pressure, the safety valve opens, and the gas in the tank body is discharged from the upper air hole; when the lower air hole is in a negative pressure state, the lower valve core is moved downward and away from the upper valve core under the action of air pressure, the safety valve opens, and external gas enters the tank body, thereby solving the problem of overpressure or negative pressure in the tank body and improving the service life of the tank body.

[0014] The embodiments of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 For the utility model Figure 1 A partial enlarged view of the A-direction view;

[0017] Figure 3 A half-section view of the upper valve core of the present utility model;

[0018] Figure 4 This is a front view of the lower valve core of the utility model;

[0019] Figure 5 This is a schematic structural diagram of the lower air hole of the present invention when it is in an overpressure state;

[0020] Figure 6 This is a schematic structural diagram of the lower air hole of the present invention when it is in a negative pressure state;

[0021] Wherein: 1 - valve body, 2 - gland, 3 - upper valve core, 4 - main spring, 5 - lower valve core, 6 - auxiliary spring, 7 - valve stem, 8 - sealing gasket, 9 - retaining ring, 11 - upper air hole, 12 - lower air hole, 13 - vent hole, 14 - bottom plane, 15 - outer ring, 16 - sliding hole, 17 - slot, 18 - threaded column, 19 - mounting part, 20 - sealing groove; DETAILED DESCRIPTION

[0022] like Figure 1 As shown, this embodiment provides a breathing safety valve for a tank, including a valve body 1, a pressure cover 2, an upper valve core 3, a main spring 4, a lower valve core 5 and a secondary spring 6. The valve body 1 is detachably connected to the pressure cover 2, and the pressure cover 2 and the valve body 1 are respectively provided with an upper air hole 11 and a lower air hole 12 that are connected to each other. The valve body 1 is abutted with an upper valve core 3 for blocking the lower air hole 12, and a main spring 4 is provided between the upper valve core 3 and the pressure cover 2, the upper valve core 3 is provided with an air hole 13 for balancing the air pressure, a lower valve core 5 for blocking the air hole 13 is provided at the bottom of the upper valve core 3, and the lower valve core 5 is provided with a valve stem 7 for sliding connection to the upper valve core 3, and a secondary spring 6 is provided between the valve stem 7 and the upper valve core 3.

[0023] Combine Figure 2-4 As shown, in this embodiment, the upper valve core 3 is provided with a sealing gasket 8 for blocking the lower air hole 12, and the valve body 1 is provided with a bottom plane 14 abutting the sealing gasket 8 at the lower air hole 12, the upper valve core 3 is sealed and connected to the valve body 1 through the sealing gasket 8, the outer side of the lower valve core 5 is provided with an outer ring portion 15 abutting the sealing gasket 8, and the air vent 13 is provided on the inner side of the outer ring portion 15, and the lower valve core 5 is sealed and connected to the upper valve core 3 through the outer ring portion 15, and the upper valve core 3 is provided with a sliding hole 16 for slidingly connecting the valve stem 7, and a retaining ring 9 is provided on the top of the valve stem 7. The auxiliary spring 6 is provided between the retaining ring 9 and the upper valve core 3, and the upper valve core 3 and the lower valve core 5 share the same sealing gasket 8, reducing the required sealing accessories and reducing costs. The retaining ring 9 is a retaining spring component, and a card groove 17 is provided on the top of the valve stem 7. The retaining ring 9 is installed in a card-connected manner through the card groove 17, so that the two ends of the spring respectively abut against the retaining ring 9 and the upper valve core 3.

[0024] In this embodiment, the gland 2 is provided with a threaded column 18, and the valve body 1 is provided with an internal thread compatible with the threaded column 18. The gland 2 is threadedly connected to the valve body 1 through the threaded column 18. The main spring 4 is provided inside the valve body 1, and the main spring 4 is arranged between the threaded column 18 and the upper valve core 3. The bottom of the valve body 1 is provided with a mounting portion 19 for externally connecting the tank body, and the mounting portion 19 is provided with a sealing groove 20 for filling the sealing ring, so that the flange / clamp installs the valve body 1 on the tank body through the mounting portion 19, and the sealing ring is pre-installed in the sealing groove 20, so that the safety valve is sealed and connected to the tank body. The outer diameter of the gland 2 is equal to the outer diameter of the valve body 1, so that the appearance of the safety valve is simple and unified. Since the valve core part, the main spring 4, and the gland 2 are installed one by one in the valve body 1, it is only necessary to rotate the gland 2 to meet the disassembly or installation of the internal filter element accessories of the safety valve, and the disassembly and assembly method is simple and quick.

[0025] Combine Figure 5 、 6 As shown, the working principle of the present invention is that when the lower air hole 12 is in an overpressure state, the upper valve core 3 is pushed upward and away from the upper air hole 11 under the action of air pressure, and the main spring 4 is compressed, and the gas in the tank body is discharged from the upper air hole 11 to prevent the tank body from being damaged due to overload; when the lower air hole 12 is in a negative pressure state, the lower valve core 5 is moved downward and away from the upper valve core 3 under the action of air pressure, and the auxiliary spring 6 is compressed, and the external gas flows to the lower air hole 12 through the upper air hole 11 and the air vent 13 to prevent the tank body from being concave and deformed due to negative pressure; when the air pressure at the lower air hole 12 is at a safety threshold, the main spring 4 / auxiliary spring 6 drives the upper valve core 3 / lower valve core 5 to reset, so that the tank body still maintains structural stability under overpressure and negative pressure conditions.

[0026] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A breathing safety valve for a tank, characterized in that: The invention comprises a valve body (1), a pressure cover (2), an upper valve core (3), a main spring (4), a lower valve core (5) and an auxiliary spring (6); the valve body (1) is detachably connected to the pressure cover (2); the pressure cover (2) and the valve body (1) are respectively provided with an upper air hole (11) and a lower air hole (12) which are connected; the valve body (1) is abutted against the upper valve core (3) for blocking the lower air hole (12); a main spring (4) is provided between the upper valve core (3) and the pressure cover (2); the upper valve core (3) is provided with an air vent (13) for balancing air pressure; a lower valve core (5) is provided at the bottom of the upper valve core (3) for blocking the air vent (13); the lower valve core (5) is provided with a valve stem (7) for sliding connection to the upper valve core (3); and an auxiliary spring (6) is provided between the valve stem (7) and the upper valve core (3).

2. A breathing safety valve for a tank according to claim 1, characterized in that: The upper valve core (3) is provided with a sealing gasket (8) for blocking the lower air hole (12); the valve body (1) is provided with a bottom plane (14) abutting against the sealing gasket (8) at the lower air hole (12); the upper valve core (3) is sealed and connected to the valve body (1) via the sealing gasket (8).

3. A breathing safety valve for a tank according to claim 2, characterized in that: The outer side of the lower valve core (5) is provided with an outer ring portion (15) that abuts against the sealing gasket (8), and the air vent (13) is provided on the inner side of the outer ring portion (15). The lower valve core (5) is sealed and connected to the upper valve core (3) through the outer ring portion (15).

4. A breathing safety valve for a tank according to claim 3, characterized in that: The upper valve core (3) is provided with a sliding hole (16) for slidingly connecting to the valve stem (7); a retaining ring (9) is provided on the top of the valve stem (7); and the auxiliary spring (6) is provided between the retaining ring (9) and the upper valve core (3).

5. A breathing safety valve for a tank according to claim 1, characterized in that: The pressure cover (2) is provided with a threaded column (18), and the top of the valve body (1) is provided with an internal thread that is compatible with the threaded column (18). The pressure cover (2) is threadedly connected to the valve body (1) through the threaded column (18). The valve body (1) is provided with a main spring (4) inside, and the main spring (4) is provided between the threaded column (18) and the upper valve core (3).

6. A breathing safety valve for a tank according to claim 5, characterized in that: The bottom of the valve body (1) is provided with a mounting portion (19) for connecting to an external tank body, and the mounting portion (19) is provided with a sealing groove (20) for filling a sealing ring.

Images