Pressure release valve with self-locking structure

Abstract

The utility model discloses a pressure release valve with a self-locking structure, which relates to the technical field of pressure release valves and comprises a valve body and a valve seat, a valve cover is arranged above the valve body, and one side of the valve cover is fixedly connected with a support plate. When the pressure release valve with the self-locking structure releases pressure, a valve rod can drive a disc to move upwards in an inner cavity of a valve cover, the outer wall of the disc extrudes a limiting block, so that the limiting block extrudes a telescopic rod towards one side, the telescopic rod drives a reset spring to contract, and then one end of the telescopic rod slides on the inner side of a connecting plate; finally, a reset spring rebounds to drive a telescopic rod to push a limiting block to one side, so that the limiting block is clamped into a limiting groove, the position of the disc can be limited, and the situation that a pressure relief spring is reset too early is prevented; the valve seat can be prevented from resetting too early under the condition that closing of the valve is not hindered, and the safety of the pressure release valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure relief valves, in particular to a pressure relief valve with a self-locking structure. Background Art

[0002] A pressure relief valve is a safety device used to protect a system from failure or danger caused by overpressure. When system pressure exceeds a preset limit, the valve automatically opens, releasing the excess pressure to the outside or a safe area, ensuring the system returns to normal operating pressure. It is widely used in high-pressure pipelines, boilers, storage tanks, and other equipment.

[0003] However, since the existing pressure relief valve has a pressure relief spring in a contracted state when it is subjected to fluid or gas pressure and is relieving pressure, when the pressure drops slightly, the pressure relief spring may reset prematurely, causing the valve seat to close prematurely, resulting in incomplete pressure relief. This situation can easily cause the pressure to rise again, increasing safety hazards. Therefore, the existing pressure relief valve needs to be improved. Utility Model Content

[0004] The purpose of the present utility model is to provide a pressure relief valve with a self-locking structure to solve the problem raised in the above background technology that the pressure relief valves currently on the market may have a pressure relief spring that resets prematurely during pressure relief, causing the valve seat to close prematurely, resulting in incomplete pressure relief. This situation may easily cause the pressure to rise again, increasing safety hazards.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pressure relief valve with a self-locking structure, comprising a valve body and a valve seat, a valve cover is provided above the valve body, a support plate is fixedly connected to one side of the valve cover, a diaphragm is provided between the valve body and the valve cover, a valve stem is slidably sleeved on the inner sides of the valve body, the valve seat is connected to one end of the valve stem close to the inside of the valve body, a disc is fixedly sleeved on the outer side of the valve stem, and locking mechanisms are connected on both sides of the disc.

[0006] Preferably, one side of the locking mechanism is connected to the support plate and the valve cover, and the locking mechanism includes a limit groove, a bidirectional electric push rod, a connecting plate, a telescopic rod, a reset spring and a limit block, and limit grooves are equally spaced on both sides of the disc.

[0007] Preferably, telescopic rods are slidably passed through both sides of the valve cover close to the limiting groove, and a return spring is sleeved on the outer side of the telescopic rod.

[0008] Preferably, one end of the telescopic rod close to the limiting groove is connected to a limiting block, and a connecting plate is slidably sleeved on the outer side of the telescopic rod.

[0009] Preferably, one end of the connecting plate away from the telescopic rod is connected to a bidirectional electric push rod, and the bidirectional electric push rod is connected to the support plate.

[0010] Preferably, a pressure relief spring is sleeved on the outer side of the valve stem near the bottom of the disc, and a docking ring is movably sleeved on the outer side of the valve cover.

[0011] Preferably, an annularly distributed insert rod is provided below the docking ring, and a clamping ring is sleeved on the outer side of the valve cover, the docking ring and the valve body, and limiting bolts are installed at both ends of the clamping ring.

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

[0013] When the cam is in the closed position, the cam is released, and the cam is released again, so that the cam is in the closed position and the cam is released again, and the cam is released again, and the cam is released again, so that the cam is released again, and the cam is released again, and the cam is released again, so that the cam is released again, and the cam is released again, and the cam is released again, so that the cam is released again, and the cam is released again,

[0014] 2. A clamping ring and a docking ring are provided. When the internal pressure relief spring needs to be replaced, several bolts need to be removed, which is rather troublesome. You can directly remove the two limit bolts and then pull the clamping ring to both sides to separate the clamping ring from the valve body and the valve cover. Finally, pull the docking ring upwards to make the docking ring drive the plug rod out of the socket. Then the valve cover and the valve body can be separated, which is convenient for replacement and maintenance of internal parts, improves the convenience of the pressure relief valve and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the three-dimensional exploded structure of the utility model;

[0018] Figure 4 This is a schematic diagram of a three-dimensional cross-sectional structure of the locking mechanism of the utility model;

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of the docking ring of the utility model;

[0020] Figure 6 It is a schematic diagram of the three-dimensional structure of the clamping ring of the utility model.

[0021] In the figure: 1. Valve body; 2. Valve cover; 3. Support plate; 4. Diaphragm; 5. Valve stem; 6. Valve seat; 7. Pressure relief spring; 8. Locking mechanism; 801. Limit groove; 802. Bidirectional electric push rod; 803. Connecting plate; 804. Telescopic rod; 805. Return spring; 806. Limit block; 9. Disc; 10. Docking ring; 11. Snap ring; 12. Limit bolt; 13. Insert rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 4 The utility model provides a technical solution: a pressure relief valve with a self-locking structure, comprising a valve body 1 and a valve seat 6, a valve cover 2 is provided above the valve body 1, a support plate 3 is fixedly connected to one side of the valve cover 2, a diaphragm 4 is provided between the valve body 1 and the valve cover 2, a valve stem 5 is slidably sleeved on the inner sides of the valve body 1, the valve seat 6 is connected to one end of the valve stem 5 close to the inside of the valve body 1, and a pressure relief spring 7 is sleeved on the outer side of the valve stem 5 close to the bottom of the disc 9.

[0024] See also Figure 1-Figure 4 , the outer side of the valve stem 5 is fixedly sleeved with a disc 9, and the two sides of the disc 9 are connected with a locking mechanism 8, one side of the locking mechanism 8 is connected to the support plate 3 and the valve cover 2, and the locking mechanism 8 includes a limit groove 801, a two-way electric push rod 802, a connecting plate 803, a telescopic rod 804, a return spring 805 and a limit block 806. The two sides of the disc 9 are provided with limit grooves 801 distributed at equal intervals, and the valve cover 2 slides through the two sides of the limit groove 801. There is a telescopic rod 804, and a return spring 805 is sleeved on the outer side of the telescopic rod 804. The end of the telescopic rod 804 close to the limit groove 801 is connected to the limit block 806. The outer side of the telescopic rod 804 is slidably sleeved with a connecting plate 803. The end of the connecting plate 803 away from the telescopic rod 804 is connected to a bidirectional electric push rod 802. The bidirectional electric push rod 802 is connected to the support plate 3. The cross-sectional shape of the limit block 806 and the limit groove 801 is trapezoidal.

[0025] In specific implementation, since the pressure relief valve is in a contracted state when it is subjected to the pressure of the fluid or gas and is relieving the pressure, the pressure relief spring 7 is in a contracted state. When the pressure drops slightly, the pressure relief spring 7 may reset prematurely, causing the valve seat 6 to close prematurely, resulting in incomplete pressure relief. This situation is likely to cause the pressure to rise again, increasing safety hazards. When the valve seat 6 pushes the valve stem 5 upward, and the valve stem 5 squeezes the pressure relief spring 7 again, the valve stem 5 will drive the disc 9 to move upward in the inner cavity of the valve cover 2, and the outer wall of the disc 9 squeezes the limit block 806, causing the limit block 806 to squeeze the telescopic rod 804 to one side, and the telescopic rod 804 drives the reset spring 805 to contract, and then one end of the telescopic rod 804 slides on the inner side of the connecting plate 803, and finally the reset spring 805 rebounds and drives the telescopic rod 80 4 pushes the limit block 806 to one side so that the limit block 806 is stuck in the limit groove 801, which can limit the position of the disc 9 and prevent the pressure relief spring 7 from resetting too early. When the pressure relief is completed, the two-way electric push rod 802 is started to push to both sides, so that the two-way electric push rod 802 drives the connecting plate 803 to move to both sides, and then the connecting plate 803 drives the telescopic rod 804 to move to both sides. Finally, the telescopic rod 804 drives the limit block 806 to disengage from the limit groove 801, and the pressure relief spring 7 rebounds and drives the valve stem 5 and the valve seat 6 to return to their original positions. Since the cross-sectional shape of the limit block 806 and the limit groove 801 is trapezoidal, and the inclined surface is located at the bottom, the valve seat 6 can be prevented from resetting too early without hindering the closing of the valve, thereby improving the safety of the pressure relief valve.

[0026] See also Figure 1 、 Figure 3 and Figure 4-Figure 6 The outer side of the valve cover 2 is movably connected with a docking ring 10, and a ring-shaped plug rod 13 is provided below the docking ring 10. The outer sides of the valve cover 2, the docking ring 10 and the valve body 1 are connected with a retaining ring 11, and limiting bolts 12 are installed at both ends of the retaining ring 11. The adjacent inner sides of the valve body 1 and the valve cover 2 are provided with ring-shaped plug holes.

[0027] In specific implementation, since the valve body 1 and the valve cover 2 of most pressure relief valves are usually connected by several bolts, when the internal pressure relief spring 7 needs to be replaced, it is necessary to remove several bolts, which is rather troublesome. The two limit bolts 12 can be directly removed, and then the retaining ring 11 can be pulled to both sides to separate the retaining ring 11 from the valve body 1 and the valve cover 2, and finally the docking ring 10 can be pulled upward to drive the plug rod 13 to separate from the socket. Then the valve cover 2 and the valve body 1 can be separated, which is convenient for replacement and maintenance of internal parts, thereby improving the convenience of the pressure relief valve and extending its service life.

[0028] Working principle: When using the pressure relief valve with a self-locking structure, first, when the pressure relief valve is releasing pressure, the gas or fluid squeezes the valve seat 6 upward, and the valve seat 6 then lifts the valve stem 5 upward, and the valve stem 5 then squeezes the pressure relief spring 7 upward, and at the same time, the valve stem 5 drives the disc 9 to move upward, so that the locking mechanism 8 limits the position of the disc 9, which can prevent the pressure relief spring 7 from resetting prematurely and does not hinder the valve seat 6 from resetting after pressure relief. When the pressure relief spring 7 or internal parts need to be replaced and maintained, the valve body 1 and the valve cover 2 can be quickly separated by the retaining ring 11 and the docking ring 10, thereby improving the safety and convenience of the pressure relief valve. The contents not described in detail in this description belong to the existing technology known to professional and technical personnel in this field.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure relief valve with a self-locking structure, comprising a valve body (1) and a valve seat (6), characterized in that: A valve cover (2) is provided above the valve body (1), a support plate (3) is fixedly connected to one side of the valve cover (2), a diaphragm (4) is provided between the valve body (1) and the valve cover (2), a valve stem (5) is slidably sleeved on the inner sides of the valve body (1), the valve cover (2) and the diaphragm (4), the valve seat (6) is connected to one end of the valve stem (5) close to the interior of the valve body (1), a disc (9) is fixedly sleeved on the outer side of the valve stem (5), and locking mechanisms (8) are connected to both sides of the disc (9).

2. A pressure relief valve with a self-locking structure according to claim 1, characterized in that: One side of the locking mechanism (8) is connected to the support plate (3) and the valve cover (2), and the locking mechanism (8) comprises a limiting groove (801), a bidirectional electric push rod (802), a connecting plate (803), a telescopic rod (804), a return spring (805) and a limiting block (806). The limiting grooves (801) are evenly spaced on both sides of the disc (9).

3. A pressure relief valve with a self-locking structure according to claim 2, characterized in that: Telescopic rods (804) are slidably passed through the two sides of the valve cover (2) close to the limiting groove (801), and a return spring (805) is sleeved on the outer side of the telescopic rod (804).

4. The pressure relief valve with a self-locking structure according to claim 3, characterized in that: One end of the telescopic rod (804) close to the limiting groove (801) is connected to the limiting block (806), and the outer side of the telescopic rod (804) is slidably sleeved with a connecting plate (803).

5. The pressure relief valve with a self-locking structure according to claim 4, characterized in that: One end of the connecting plate (803) away from the telescopic rod (804) is connected to a bidirectional electric push rod (802), and the bidirectional electric push rod (802) is connected to the support plate (3).

6. The pressure relief valve with a self-locking structure according to claim 1, characterized in that: A pressure relief spring (7) is sleeved on the outer side of the valve stem (5) near the bottom of the disc (9), and a docking ring (10) is movably sleeved on the outer side of the valve cover (2).

7. The pressure relief valve with a self-locking structure according to claim 6, characterized in that: An annularly distributed insert rod (13) is provided below the docking ring (10), and a clamping ring (11) is sleeved on the outer sides of the valve cover (2), the docking ring (10) and the valve body (1), with limiting bolts (12) installed at both ends of the clamping ring (11).

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