A pilot-operated high-flow safety valve

Abstract

This utility model relates to a pilot-operated high-flow safety valve. The technical problem this utility model aims to solve is to provide a pilot-operated high-flow safety valve. The technical solution adopted by this utility model includes: a main valve body, a connector, a secondary valve body, a main valve core and a main spring, a valve sleeve, a spring seat block and a secondary spring, and a secondary valve core. The main valve core has a left cavity, a right cavity, and a damping hole. A high-flow pressure relief hole is provided at intervals around the inner wall of the left cavity. The outer valve body has a left cavity and a right cavity, connected by a through hole. The advantages of this utility model are: small size, easy installation, and the ability to achieve a staged pressure relief process of "first releasing pressure with a small flow rate, then releasing pressure with a large flow rate." It can quickly release some high pressure when there is a sudden pressure increase from the top, and then drive the main valve core to move to the right to open the high-flow pressure relief hole, avoiding damage to the column cylinder or support due to delayed pressure relief.

Description

Technical Field

[0001] This utility model relates to a pilot-operated high-flow safety valve. Background Technology

[0002] With the further development of hydraulic support technology in coal mine fully mechanized mining, the working resistance and cylinder diameter of hydraulic supports are increasing. In some coal mines, the ground pressure impact at the working face is intense. This necessitates a large pressure relief flow rate from the column safety valve. When sudden pressure comes from the roof, the high-pressure fluid inside the column must be quickly depressurized within a safe range by the column safety valve to protect the column and support structure from damage. After quickly releasing the external high pressure, the original support performance of the column must be maintained. Existing safety valves operate stably when the ground pressure impact is not significant and the roof pressure is not noticeable. However, when sudden pressure comes from the working face with intense ground pressure, the high-pressure fluid formed in the column cavity often cannot be unloaded in time, leading to serious accidents such as damage to hydraulic support structure, column cylinder expansion, and threats to personnel safety. The reason for this is that the diameter of the pressure relief valve core of existing large-flow safety valves is limited by springs and space constraints, making it difficult to increase the pressure relief flow rate. Utility Model Content

[0003] To address the above problems, the technical problem to be solved by this utility model is to provide a pilot-operated high-flow safety valve.

[0004] The technical solution adopted by the pilot-operated high-flow safety valve of this utility model is characterized by comprising a safety valve outer valve shell, a connector threaded to the left end of the safety valve outer valve shell, a safety valve secondary valve shell threaded to the right end of the safety valve outer valve shell, a main valve core and a main spring disposed in the safety valve outer valve shell, a valve sleeve, a spring seat block and a secondary spring disposed in the safety valve outer valve shell, and a secondary valve core disposed in the valve sleeve. The main valve core is provided with a main valve core left cavity and a main valve core right cavity communicating with the connector, and a damping hole connecting the main valve core left cavity and the main valve core right cavity. The inner wall of the main valve core left cavity is provided with high-flow pressure relief holes at intervals around an arc. The safety valve outer valve shell is provided with an outer valve shell left cavity and an outer valve shell right cavity. The outer valve shell left cavity and the outer valve shell right cavity are connected by an outer valve shell through hole. The valve sleeve is threaded to the inner wall of the outer valve shell left cavity. The spring seat block can move radially in the outer valve shell right cavity through the secondary spring.

[0005] The valve sleeve is provided with a valve sleeve communication hole that communicates with the right cavity of the main valve core and a valve sleeve positioning groove for inserting the auxiliary valve core. One end of the auxiliary valve core is provided with a auxiliary valve core water channel that communicates with the valve sleeve communication hole. The inner wall of the auxiliary valve core water channel is provided with small flow pressure relief holes at intervals around an arc. The other end of the auxiliary valve core passes through the through hole of the outer valve shell and forms a hard seal with the spring seat block. One end of the main spring abuts against the left end of the valve sleeve and the other end abuts against the right cavity of the main valve core. The main valve core can move radially within the outer valve shell of the safety valve through the main spring.

[0006] The connector end is provided with a main sealing gasket at the joint with the outer valve body of the safety valve. A secondary sealing gasket positioning groove is provided between the left cavity of the outer valve body and the through hole of the outer valve body. The secondary valve core is covered with a secondary sealing gasket placed on the secondary sealing gasket positioning groove.

[0007] The other end of the secondary valve core is provided with a secondary valve core arc head, and the side end of the spring seat block is provided with a seat block conical groove that is hard-sealed with the arc head of the secondary valve core.

[0008] It also includes a pressure adjusting screw, which is threaded to the inner wall of the right cavity of the outer valve housing, and one end of the auxiliary spring abuts against the spring seat block and the other end abuts against the pressure adjusting screw.

[0009] The valve sleeve has a transition groove between the valve sleeve connecting hole and the valve sleeve positioning groove. The inner diameter of the valve sleeve connecting hole is smaller than the inner diameter of the valve sleeve transition groove, and the inner diameter of the valve sleeve transition groove is smaller than the inner diameter of the valve sleeve positioning groove.

[0010] It also includes a buffer pad, and the spring seat block has a seat block limiting port at the seat block tapered groove for inserting the buffer pad, and the length of the buffer pad is greater than the depth of the seat block limiting port.

[0011] The advantages of this pilot-operated high-flow safety valve are: small size, easy installation, and the ability to achieve a staged pressure relief process of "first releasing pressure with a small flow rate, then releasing pressure with a large flow rate". When pressure suddenly comes from the top, it can quickly release part of the high pressure first, and then drive the main valve core to move to the right to open the large-flow pressure relief hole, which significantly improves the pressure relief response speed and flow capacity, and avoids damage to the column cylinder or support due to delayed pressure relief. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a half-sectional view of the pilot-operated high-flow safety valve of this utility model;

[0014] Figure 2 This is a half-sectional view of the main valve core of this utility model;

[0015] Figure 3 This is a half-sectional view of the auxiliary valve body of the safety valve of this utility model;

[0016] Figure 4 This is a half-sectional view of the valve sleeve of this utility model;

[0017] Figure 5 This is a half-sectional view of the auxiliary valve core of this utility model;

[0018] Figure 6 This is a half-sectional view of the spring seat block of this utility model. Detailed Implementation

[0019] like Figure 1-6 As shown, the pilot-operated high-flow safety valve of this utility model includes a safety valve outer valve housing 2, a connector 1 threadedly connected to the left end of the safety valve outer valve housing 2, a safety valve secondary valve housing 6 threadedly connected to the right end of the safety valve outer valve housing 2, a main valve core 3 and a main spring 8 disposed within the safety valve outer valve housing 2, a valve sleeve 5, a spring seat block 13 and a secondary spring 9 disposed within the safety valve outer valve housing 2, and a secondary valve core 11 disposed within the valve sleeve 5. The main valve core 3 has a main valve core left cavity 2 communicating with the connector 1. 0. The main valve core right cavity 21 and the damping hole 22 connecting the main valve core left cavity 20 and the main valve core right cavity 21. The inner wall of the main valve core left cavity 20 is provided with large flow pressure relief holes 23 at intervals around an arc. The safety valve outer valve housing 2 is provided with an outer valve housing left cavity 24 and an outer valve housing right cavity 26. The outer valve housing left cavity 24 and the outer valve housing right cavity 26 are connected by an outer valve housing through hole 25. The valve sleeve 5 is threaded to the inner wall of the outer valve housing left cavity 24. The spring seat block 13 can be connected to the auxiliary spring 9. The outer valve housing right cavity 26 moves radially; the valve sleeve 5 is provided with a valve sleeve communication hole 30 communicating with the right cavity 21 of the main valve core and a valve sleeve positioning groove 31 for inserting the auxiliary valve core 11. One end of the auxiliary valve core 11 is provided with a auxiliary valve core water channel 32 communicating with the valve sleeve communication hole 30. The inner wall of the auxiliary valve core water channel 32 is provided with small flow pressure relief holes 33 at intervals around an arc. The other end of the auxiliary valve core 11 passes through the outer valve housing through hole 25 and forms a hard seal with the spring seat block 13. The main spring... One end of the spring 8 abuts against the left end of the valve sleeve 5 and the other end abuts against the right cavity 21 of the main valve core. The main valve core 3 can move radially within the outer valve shell 2 of the safety valve through the main spring 8, realizing a staged pressure relief process of "first releasing pressure with a small flow rate, and then releasing pressure with a large flow rate". This design can quickly release part of the high pressure when the top suddenly comes under pressure, and then drive the main valve core 3 to move to the right to open the large flow pressure relief hole 23, which significantly improves the pressure relief response speed and flow capacity, and avoids damage to the column cylinder or bracket due to delayed pressure relief.

[0020] The connector 1 is provided with a main sealing gasket 4 at the joint with the outer valve shell 2 of the safety valve. A secondary sealing gasket positioning groove 27 is provided between the left cavity 24 of the outer valve shell and the through hole 25 of the outer valve shell. The secondary valve core 11 is covered with a secondary sealing gasket 16 placed on the secondary sealing gasket positioning groove 27, which can effectively prevent high pressure liquid leakage and improve the sealing performance and service life of the whole machine.

[0021] The other end of the secondary valve core 11 is provided with a secondary valve core arc head 34, and the side end of the spring seat block 13 is provided with a seat block conical groove 35 that is hard-sealed with the secondary valve core arc head 34.

[0022] It also includes a pressure adjusting screw 15, which is threaded to the inner wall of the right cavity 26 of the outer valve housing. One end of the auxiliary spring 9 abuts against the spring seat block 13 and the other end abuts against the pressure adjusting screw 15. The preload of the auxiliary spring 9 can be adjusted according to the actual working conditions, thereby flexibly setting the opening pressure of the auxiliary valve core 11 and enhancing the adaptability and adjustability of the safety valve.

[0023] The valve sleeve 5 has a valve sleeve transition groove 37 between the valve sleeve connecting hole 30 and the valve sleeve positioning groove 31. The inner diameter of the valve sleeve connecting hole 30 is smaller than the inner diameter of the valve sleeve transition groove 37, and the inner diameter of the valve sleeve transition groove 37 is smaller than the inner diameter of the valve sleeve positioning groove 31. This design can ensure the stable sliding of the auxiliary valve core 11 and improve the smoothness and control accuracy of the pressure relief process.

[0024] It also includes a buffer pad 17. The spring seat block 13 has a seat block limiting port 38 at the seat block conical groove 35 for inserting the buffer pad 17. The length of the buffer pad 17 is greater than the depth of the seat block limiting port 38. It can effectively absorb the impact force when the auxiliary valve core 11 opens or closes at high speed, prevent hard collision damage to the valve components, and extend the service life of the auxiliary valve core 11 and the spring seat block 13.

[0025] Working principle: Under normal pressure holding conditions, the small-flow pressure relief hole 33 of the auxiliary valve core 11 is located to the left of the auxiliary sealing gasket 16 under the thrust of the auxiliary spring 9. The large-flow pressure relief hole 23 of the main valve core 3 is located to the left of the main sealing gasket 4 under the pressure balance of the main spring 8 and the damping hole 22. When the pressure suddenly comes from the top, the high pressure causes the thrust acting on the auxiliary valve core 11 to exceed the thrust of the auxiliary spring 9 on the auxiliary valve core 11, causing the auxiliary valve core 11 to move to the right. The small-flow pressure relief hole 33 moves into the right cavity 26 of the outer valve housing to achieve small-flow pressure relief. Since the right cavity 21 of the main valve core 3 is connected to the small-flow pressure relief hole 33, the pressure in the right cavity 21 of the main valve core decreases. Due to the limitation of the damping hole 22, a pressure difference is formed between the left cavity 20 and the right cavity 21 of the main valve core. The main valve core 3 moves to the right, and the large-flow pressure relief hole 23 passes through the main sealing gasket 4 to achieve large-flow pressure relief.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A pilot operated high capacity safety valve characterized by: The system includes an outer valve housing (2), a connector (1) threaded to the left end of the outer valve housing (2), a secondary valve housing (6) threaded to the right end of the outer valve housing (2), a main valve core (3) and a main spring (8) located within the outer valve housing (2), a valve sleeve (5), a spring seat block (13) and a secondary spring (9) located within the outer valve housing (2), and a secondary valve core (11) located within the valve sleeve (5). The main valve core (3) contains a left cavity (20) and a right cavity (21) communicating with the connector (1). The damping hole (22) connects the left cavity (20) and the right cavity (21) of the main valve core. The inner wall of the left cavity (20) of the main valve core is provided with large flow pressure relief holes (23) at intervals around the arc. The outer valve shell (2) of the safety valve is provided with an outer valve shell left cavity (24) and an outer valve shell right cavity (26). The outer valve shell left cavity (24) and the outer valve shell right cavity (26) are connected by an outer valve shell through hole (25). The valve sleeve (5) is threaded to the inner wall of the outer valve shell left cavity (24). The spring seat block (13) can move radially in the outer valve shell right cavity (26) through the auxiliary spring (9). The valve sleeve (5) is provided with a valve sleeve communication hole (30) that communicates with the right cavity (21) of the main valve core and a valve sleeve positioning groove (31) for inserting the auxiliary valve core (11). One end of the auxiliary valve core (11) is provided with a auxiliary valve core water channel (32) that communicates with the valve sleeve communication hole (30). The inner wall of the auxiliary valve core water channel (32) is provided with small flow pressure relief holes (33) at intervals around the arc. The other end of the auxiliary valve core (11) passes through the outer valve shell through hole (25) and forms a hard seal with the spring seat block (13). One end of the main spring (8) abuts against the left end of the valve sleeve (5) and the other end abuts against the right cavity (21) of the main valve core. The main valve core (3) can move radially inside the outer valve shell (2) of the safety valve through the main spring (8).

2. The pilot operated high capacity safety valve of claim 1 wherein: The connector (1) is provided with a main sealing gasket (4) at the junction with the outer valve shell (2) of the safety valve. A secondary sealing gasket positioning groove (27) is provided between the left cavity (24) of the outer valve shell and the through hole (25) of the outer valve shell. The secondary valve core (11) is covered with a secondary sealing gasket (16) placed on the secondary sealing gasket positioning groove (27).

3. The pilot operated high capacity safety valve of claim 1 wherein: The other end of the secondary valve core (11) is provided with a secondary valve core arc head (34), and the side end of the spring seat block (13) is provided with a seat block conical groove (35) that is hard-sealed with the secondary valve core arc head (34).

4. The pilot operated high capacity safety valve of claim 1 wherein: It also includes a pressure adjusting screw (15), which is threaded to the inner wall of the right cavity (26) of the outer valve housing, and one end of the auxiliary spring (9) abuts against the spring seat block (13) and the other end abuts against the pressure adjusting screw (15).

5. The pilot-operated high-flow safety valve according to claim 1, characterized in that: The valve sleeve (5) has a valve sleeve transition groove (37) between the valve sleeve connecting hole (30) and the valve sleeve positioning groove (31). The inner diameter of the valve sleeve connecting hole (30) is smaller than the inner diameter of the valve sleeve transition groove (37), and the inner diameter of the valve sleeve transition groove (37) is smaller than the inner diameter of the valve sleeve positioning groove (31).

6. The pilot-operated high-flow safety valve according to claim 3, characterized in that: It also includes a buffer pad (17), and the spring seat block (13) has a seat block limiting port (38) for inserting the buffer pad (17) at the seat block conical groove (35), and the length of the buffer pad (17) is greater than the depth of the seat block limiting port (38).

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