A fire-safe hydraulic valve and a control method for closing a valve using the same

Abstract

This invention discloses a fireproof hydraulic valve and a control method for closing the valve using the fireproof hydraulic valve, belonging to the field of fireproof valve technology. It includes a valve body with a cavity for accommodating a valve core. The valve core is divided into a pressure zone and a valve-closing zone, which are not interconnected. The pressure zone is connected to a pressure oil circuit. The valve-closing zone has a valve-closing oil circuit for supplying hydraulic oil required to drive the cylinder. The valve-closing oil circuit and the pressure oil circuit are respectively connected to a main oil source. A connecting device with an internal damping orifice is provided between the pressure oil circuit and the main oil source. The valve core is connected to the inner wall of the valve-closing zone via an elastic telescopic element, which is connected to the valve core. The pressure oil circuit and / or the pressure zone are connected to a drain oil circuit for pressure relief. The drain oil circuit is connected to the outside environment and has a flow-blocking block for opening and closing the drain oil circuit. This invention controls the movement of the valve core simply by relieving the pressure oil, without other factors affecting the movement of the valve core, improving the smoothness of valve core movement and enhancing the operational reliability of the fireproof hydraulic valve.

Description

Technical Field

[0001] This invention relates to the field of fireproof hydraulic valve technology, and in particular to a fireproof hydraulic valve and a control method for closing the valve using the hydraulic actuator of the fireproof hydraulic valve. Background Technology

[0002] Fireproof hydraulic valves are key components in electro-hydraulic actuators, capable of quickly closing the valve in the event of a fire. Existing fireproof valves, such as the invention patent with application number 202111534533.4, include a fusible plug 1, a first valve body 5, a first valve core 4, a pressure sleeve 2, and a spring 3. The fusible plug 1 is installed at one end of the first valve body 5, while the other end serves as a medium inlet 504 and an outlet 505. The fusible plug 1 presses against the pressure sleeve 2, compressing and deforming the spring 3, thereby blocking the medium inlet 504 and outlet 505 at the end of the first valve core 4. In the event of a fire, the fusible plug 1... When the fusible alloy 102 melts, under the action of the spring 3 and the medium pressure, the pressure sleeve 2 and the first valve core 4 move away from the medium inlet and outlet. The medium inlet 504 and outlet 505 are connected, and the oil circuit is open. This fire valve uses a pressure sleeve 2 at one end of the first valve core 5. The pressure applied by the pressure sleeve 2 is balanced with the pressure applied by the medium at the other end of the first valve core 5, so that the first valve core 5 is fixed in the position of closing the medium inlet 504 and outlet 505. In this structure, if the pressure sleeve 2 gets stuck, the first valve core 4 will not be able to move, which will lead to the oil circuit not being open.

[0003] In summary, there is an urgent need to design a fireproof hydraulic valve for hydraulic actuators that allows for smoother movement during a fire. Summary of the Invention

[0004] The purpose of this invention is to address the defects and shortcomings of the prior art by providing a fireproof hydraulic valve and a control method for closing the valve using the fireproof hydraulic valve. By using hydraulic oil to control the valve core movement, compared with the prior art, the movement of the valve core is not limited by the pressure sleeve, and the movement of the valve core is smoother, thereby improving the working reliability of the fireproof hydraulic valve.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a fireproof hydraulic valve, comprising a valve body, the valve body having a cavity for accommodating a valve core, the valve core dividing the cavity into a non-communicating pressure zone and a valve-closing zone, the pressure zone being connected to a pressure oil circuit, the valve-closing zone having a valve-closing oil circuit for supplying hydraulic oil required to drive the cylinder, the valve-closing oil circuit and the pressure oil circuit being respectively connected to a main oil source, the pressure oil circuit and the main oil source being provided with a connecting device having an internal damping orifice; the valve core being connected to the inner wall of the valve-closing zone via an elastic telescopic element, the elastic telescopic element being connected to the valve core; the pressure oil circuit and / or the pressure zone being connected to a drain oil circuit for pressure relief, the drain oil circuit being connected to the outside, the drain oil circuit having a throttling block for opening and closing the drain oil circuit;

[0007] Preferably, the valve closing oil circuit includes an oil inlet branch and an oil outlet branch. The valve body and the valve core cooperate to form an A port communicating with the upper chamber of the oil cylinder, a B port communicating with the lower chamber of the oil cylinder, a P port communicating with the main oil source, and a T port communicating with the oil tank. The oil inlet branch includes the P port and the A port that can be connected, and the oil outlet branch includes the T port and the B port that can be connected.

[0008] Preferably, the pressure oil circuit is connected to the drain oil circuit, and the end of the valve body is provided with a cover. The cover is detachably connected to the valve body, and both the pressure oil circuit and the drain oil circuit are located inside the cover.

[0009] Preferably, the drain line is connected to the waste oil tank;

[0010] Preferably, the intercepting block is a fusible alloy with a cross-sectional area not smaller than that of the drain oil passage;

[0011] Preferably, the fusible alloy is fixedly connected to the oil drain circuit;

[0012] Preferably, the fusible alloy is welded to the sidewall of the drain oil passage;

[0013] Preferably, the elastic telescopic element is a spring;

[0014] Preferably, the main oil source is an accumulator.

[0015] The present invention also provides a control method for closing a valve using a fireproof hydraulic valve, comprising the following:

[0016] S1 Connecting the drain oil passage: At normal temperature, the throttling block installed in the drain oil passage is solid, and the drain oil passage is not connected to the outside. When the temperature of the fireproof hydraulic valve is higher than the melting temperature of the throttling block, the throttling block melts, and the drain oil passage is connected to the outside.

[0017] S2 Pressure Oil Relief: The valve core separates the cavity inside the valve body to form a pressure zone and a valve-closing zone that is not connected to the pressure zone. The pressure zone is connected to the pressure oil circuit that supplies hydraulic oil to the pressure zone. The pressure zone and / or the pressure oil circuit are connected to the drain oil circuit. The valve core is connected to the inner wall of the valve-closing zone through an elastic telescopic element. After the drain oil circuit mentioned in S1 is connected to the outside, the hydraulic oil in the pressure oil circuit and / or the pressure zone flows out through the drain oil circuit. The forces on both sides of the valve core become unbalanced. The valve core moves under the push of the elastic telescopic element, opening the valve-closing oil circuit located in the valve-closing zone.

[0018] S3 cylinder actuation, valve closing: The main oil source is connected to the pressure oil circuit and the valve closing oil circuit respectively. The pressure oil circuit is connected to the main oil source through a connecting device with an internal damping hole. After the valve closing oil circuit in S2 is opened, the main oil source is connected to the upper chamber of the cylinder through the oil inlet branch of the valve closing oil circuit. The lower chamber of the cylinder is connected to the oil tank through the oil outlet branch of the valve closing oil circuit. Driven by hydraulic oil, the piston of the cylinder moves down to drive the valve to close.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] 1. This invention provides elastic telescopic elements and pressure oil circuits for applying hydraulic pressure to the valve core at both ends. When the pressure oil circuit is in a pressure-holding state, the valve core is in a balanced state under the action of the elastic telescopic elements and the pressure oil, preventing the main oil source from connecting to the cylinder and thus preventing the cylinder from operating. When an external fire occurs and the temperature rises, the fusible alloy melts, the drain oil circuit connects, and the pressure oil flows out through the drain oil circuit, releasing the pressure. This causes an imbalance of forces at both ends of the valve core, causing the valve core to operate and connecting the main oil source to the upper chamber of the cylinder, as well as the lower chamber of the cylinder to the oil tank. The piston of the cylinder moves downward, driving the valve to close. Compared to the prior art that uses fusible plugs and pressure sleeves to control the valve core's movement, this application uses hydraulic oil and elastic telescopic elements to control the valve core's movement. The force applied by the hydraulic oil can act directly on the end face of the valve core without needing to transmit pressure through the pressure sleeve. Therefore, the movement of the valve core is not restricted by the pressure sleeve, improving the smoothness of the valve core's movement and enhancing the operational reliability of the fireproof hydraulic valve.

[0021] 2. By setting both the pressure oil passage and the drain oil passage inside the cover, and by setting the cover in a detachable manner at the end of the valve core, this invention allows for the replacement of only the cover when the fireproof hydraulic valve is not severely damaged, thus reducing replacement costs compared to replacing the entire fireproof hydraulic valve.

[0022] 3. By setting up a connecting device with an internal damping hole, the present invention limits the amount of hydraulic oil flowing into the pressure oil circuit, so that the hydraulic oil has sufficient pressure to flow into the upper chamber of the oil cylinder through the oil inlet branch, thereby further ensuring the working reliability of the fireproof hydraulic valve. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a fire damper in the prior art;

[0025] Figure 2 This is a schematic diagram of the fireproof hydraulic valve of this application;

[0026] Figure 3 This is a schematic diagram showing the distribution of the pressure zone and the valve-closing zone.

[0027] Figure 4 This is a schematic diagram of the connection structure between the fireproof hydraulic valve, the main oil source, and the oil cylinder in this application.

[0028] Among them, 1. Fusible plug; 102. Fusible alloy; 2. Pressure sleeve; 3. Spring; 4. First valve core; 5. First valve body; 504. Medium inlet; 505. Outlet; 6. Valve body; 7. Valve core; 8. Cavity; 9. Pressure zone; 10. Valve closing zone; 11. Pressure oil circuit; 12. Main oil source; 13. Damping orifice; 14. Elastic telescopic element; 15. Oil drain circuit; 16. Cut-off block; 17. Oil inlet branch; 18. Oil outlet branch; 19. Port A; 20. Port B; 21. Port P; 22. Oil tank; 23. Port T; 24. Cover; 25. Waste oil tank; 26. Oil cylinder. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 2 to 4As shown, the present invention provides a fireproof hydraulic valve, including a valve body 6. The valve body 6 has a cavity 8 for accommodating a valve core 7. The valve core 7 divides the cavity 8 into a non-communicating pressure zone 9 and a valve-closing zone 10. The pressure zone 9 is connected to a pressure oil circuit 11, and hydraulic oil in the pressure oil circuit 11 flows into the pressure zone 9, applying hydraulic pressure to the valve core 7. The valve-closing zone 10 has a valve-closing oil circuit for supplying hydraulic oil required to drive the cylinder 26. The valve-closing oil circuit and the pressure oil circuit 11 are respectively connected to a main oil source 12. A connection with an internal damping orifice 13 is provided between the pressure oil circuit 11 and the main oil source 12. The device controls the amount of oil entering the pressure oil circuit 11 through a connecting device with an internal damping hole 13, so that when the valve closing oil circuit is connected, the oil pressure of the hydraulic oil flowing into the valve closing oil circuit will not be greatly affected, so that the hydraulic oil can flow into the chamber of the cylinder 26 to drive the cylinder 26 to move; the valve core 7 is connected to the inner wall of the valve closing area 10 through the elastic telescopic element 14. The elastic telescopic element 14 is connected to the valve core 7. Under the combined action of the elastic telescopic element 14 and the hydraulic oil, the valve core 7 can be stably positioned to block the valve closing oil circuit, so that the hydraulic oil will not flow into the valve closing oil circuit;

[0032] The pressure oil passage 11 and / or pressure zone 9 are connected to the drain oil passage 15 for pressure relief. The drain oil passage 15 is connected to the outside. A flow-blocking block 16 for opening and closing the drain oil passage 15 is provided inside the drain oil passage 15. In a preferred embodiment of the present invention, the flow-blocking block 16 is a fusible alloy with a cross-sectional area not smaller than that of the drain oil passage 15. The fusible alloy is fixedly disposed inside the drain oil passage 15. To ensure that the fusible alloy is firmly fixed to the drain oil passage 15, the present invention preferably welds the fusible alloy to the side wall of the drain oil passage 15. At room temperature, the fusible alloy is solid. When the external temperature is higher than the melting point of the fusible alloy, the fusible alloy melts and opens the drain oil passage 15, thus opening the pressure oil passage 11 and / or pressure zone 9. The pressure oil in the pressure zone 9 flows out through the drain oil passage 15, and the hydraulic oil in the pressure oil passage 11 and / or pressure zone 9 is depressurized, which reduces the pressure applied to the valve core 7 by the hydraulic oil. The pressure on both sides of the valve core 7 becomes unbalanced, and the valve core 7 moves under the thrust of the elastic telescopic element 14, opening the valve oil passage to deliver hydraulic oil to the oil cylinder 26, thereby driving the oil cylinder 26 to move and close the valve. In order to avoid the oil mixed with fusible alloy from contaminating the oil tank 22, the present invention sets the drain oil passage 15 to be connected to the waste oil tank 25. As a preferred embodiment of the present invention, the elastic telescopic element 14 is a spring. The fusible alloy used in the present invention has the characteristics of high welding strength and short melting time.

[0033] The valve closing oil circuit includes an inlet branch 17 and an outlet branch 18. The valve body 6 and the valve core 7 cooperate to form an A port 19 that communicates with the upper chamber of the oil cylinder 26, a B port 20 that communicates with the lower chamber of the oil cylinder 26, a P port 21 that communicates with the main oil source 12, and a T port 23 that communicates with the oil tank 22. The inlet branch 17 includes the A port 19 and the P port 21 that can be connected, and the outlet branch 18 includes the B port 20 and the T port 23 that can be connected. When the elastic telescopic element 14 pushes the valve core 7 to move, the P port 21 and the A port 19 are connected, the inlet branch 17 is open, the T port 23 and the B port 20 are connected, and the outlet branch 18 is open. When the forces on both sides of the valve core 7 are balanced, the P port 21 and the A port 19 are not connected, the inlet branch 17 is in the open state, the T port 23 and the B port 20 are not connected, and the outlet branch 18 is in the open state.

[0034] In a preferred embodiment of the present invention, the valve body 6 is provided with a cover 24 at its end. The cover 24 is detachably connected to the valve body 6. The pressure oil passage 11 and the drain oil passage 15 are both located inside the cover 24. The pressure oil passage 11 and the drain oil passage 15 are connected. When the fireproof hydraulic valve is not severely damaged, only the cover 24 can be replaced. When the fireproof hydraulic valve is severely damaged, the entire fireproof hydraulic valve needs to be replaced.

[0035] The present invention also provides a control method for closing the valve using the above-mentioned fireproof hydraulic valve, comprising the following:

[0036] S1 connects to the drain oil passage 15: When the external temperature is lower than the melting temperature of the throttling block 16, the throttling block 16 is solid and the drain oil passage 15 is disconnected. When the external temperature is higher than the melting temperature of the throttling block 16, the throttling block 16 melts and the drain oil passage 15 is connected to the outside.

[0037] S2 Pressure Oil Relief: After the oil draining passage 15 is connected to the outside, the pressure oil passage 11 and / or pressure zone 9 are connected to the outside through the oil draining passage 15. Under the action of pressure difference, the pressure oil in the pressure oil passage 11 and / or pressure zone 9 flows out through the oil draining passage 15. The hydraulic pressure acting on the end of the valve core 7 is reduced accordingly. The forces acting on both ends of the valve core 7 are unbalanced. Under the thrust of the elastic telescopic element 14, the position of the valve core 7 changes. Port P 21 is connected to Port A 19, the oil inlet branch 17 is connected, Port T 23 is connected to Port B 20, and the oil outlet branch 18 is connected.

[0038] S3 cylinder 26 actuates, closing the valve: When both the inlet branch 17 and the outlet branch 18 in S2 are connected, the main oil source 12 is connected to the upper chamber of the cylinder through the connected inlet branch 17. The hydraulic oil in the main oil source 12 flows into the upper chamber of the cylinder 26. The lower chamber of the cylinder 26 is connected to the oil tank 22 through the connected outlet branch 18. The oil in the lower chamber of the cylinder 26 flows back into the oil tank 22. Under the action of the pressure difference between the upper and lower chambers, the piston in the cylinder 26 moves downward to push the valve to close.

[0039] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fireproof hydraulic valve, characterized in that: The device includes a valve body, which has a cavity for accommodating a valve core. The valve core divides the cavity into a non-communicating pressure zone and a valve-closing zone. The pressure zone is connected to a pressure oil circuit, and the valve-closing zone has a valve-closing oil circuit for supplying hydraulic oil required to drive the hydraulic cylinder. The valve-closing oil circuit and the pressure oil circuit are respectively connected to a main oil source. A connecting device with an internal damping orifice is provided between the pressure oil circuit and the main oil source. The valve core is connected to the inner wall of the valve-closing zone via an elastic telescopic element, and the elastic telescopic element is connected to the valve core. The pressure oil circuit and / or the pressure zone are connected to a drain oil circuit for pressure relief. The drain oil circuit is connected to the outside, and a flow-blocking block is provided in the drain oil circuit for opening and closing the drain oil circuit. The intercepting block is a fusible alloy with a cross-sectional area not smaller than that of the drain oil passage.

2. The fireproof hydraulic valve according to claim 1, characterized in that: The valve-closing oil circuit includes an inlet branch and an outlet branch. The valve body and the valve core cooperate to form an A port that communicates with the upper chamber of the oil cylinder, a B port that communicates with the lower chamber of the oil cylinder, a P port that communicates with the main oil source, and a T port that communicates with the oil tank. The inlet branch includes the P port and the A port that can be connected, and the outlet branch includes the T port and the B port that can be connected.

3. The fireproof hydraulic valve according to claim 2, characterized in that: The pressure oil circuit is connected to the drain oil circuit. The valve body is provided with a cover at its end. The cover is detachably connected to the valve body. Both the pressure oil circuit and the drain oil circuit are located inside the cover.

4. The fireproof hydraulic valve according to claim 1, characterized in that: The drain line is connected to the waste oil tank.

5. The fireproof hydraulic valve according to claim 1, characterized in that: The fusible alloy is fixedly connected to the oil drain circuit.

6. The fireproof hydraulic valve according to claim 5, characterized in that: The fusible alloy is welded to the side wall of the drain oil passage.

7. The fireproof hydraulic valve according to claim 1, characterized in that: The elastic telescopic element is a spring.

8. The fireproof hydraulic valve according to claim 2, characterized in that: The main oil source is an accumulator.

9. A control method for closing a valve using a fireproof hydraulic valve, applicable to the fireproof hydraulic valve described in any one of claims 1 to 8, characterized in that, Includes the following: S1 Connecting the drain oil circuit: Under normal temperature conditions, the throttling block installed in the drain oil circuit is solid, and the drain oil circuit is not connected to the outside. When the temperature of the fireproof hydraulic valve is higher than the melting temperature of the throttling block, the throttling block melts, and the drain oil circuit is connected to the outside. S2 Pressure Oil Relief: The valve core separates the cavity inside the valve body to form a pressure zone and a valve-closing zone that is not connected to the pressure zone. The pressure zone is connected to the pressure oil circuit that supplies hydraulic oil to the pressure zone. The pressure zone and / or the pressure oil circuit are connected to the drain oil circuit. The valve core is connected to the inner wall of the valve-closing zone through an elastic telescopic element. After the drain oil circuit mentioned in S1 is connected to the outside, the hydraulic oil in the pressure oil circuit and / or the pressure zone flows out through the drain oil circuit. The forces on both sides of the valve core become unbalanced. The valve core moves under the push of the elastic telescopic element, opening the valve-closing oil circuit located in the valve-closing zone. S3 cylinder actuation, valve closing: The main oil source is connected to the pressure oil circuit and the valve closing oil circuit respectively. The pressure oil circuit is connected to the main oil source through a connecting device with an internal damping hole. After the valve closing oil circuit in S2 is opened, the main oil source is connected to the upper chamber of the cylinder through the oil inlet branch of the valve closing oil circuit. The lower chamber of the cylinder is connected to the oil tank through the oil outlet branch of the valve closing oil circuit. Driven by hydraulic oil, the piston of the cylinder moves down to drive the valve to close.

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