Medicament control valve of mining vehicle-mounted fire extinguishing system

Abstract

The invention discloses a medicament control valve of a mining vehicle-mounted fire extinguishing system, which comprises a valve body, a pressure storage cavity and a driving cavity are arranged in the valve body, and a sealing separator capable of being punctured is arranged between the pressure storage cavity and the driving cavity; the composite piston assembly is axially and movably arranged in the driving cavity and is driven by external starting force to pierce the sealing isolation piece; the composite piston assembly comprises a first-stage piston assembly and a second-stage piston assembly, and the second-stage piston assembly can move relative to the first-stage piston assembly under the action of medicament flow from the pressure storage cavity after the sealing isolation piece is punctured. The composite piston assembly is driven by external starting force to move in the axial direction and pierce the sealing isolation piece, and communication of the driving cavity and the pressure storage cavity is achieved; the second-stage piston assembly is driven to move relative to the first-stage piston assembly by the pressure of the medicament flow released in the pressure storage cavity so as to finish the final opening of the control valve, and the whole opening process is reliable in action; and under the mine environment with limited space and severe environment, reliable triggering and complete opening can be kept.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting equipment technology, and in particular to the agent control valve of a mine vehicle-mounted fire extinguishing system. Background Technology

[0002] Mining vehicles face high fire risks in areas such as the engine compartment and battery pack, making the reliability of the agent valves in their onboard fire suppression systems crucial. Currently, the commonly used piston-pressure differential valves have significant drawbacks in the harsh realities of mining vehicle environments, severely impacting system effectiveness.

[0003] First, the opening of the valve piston relies entirely on the pressure difference between its two sides (the accumulator chamber and the outlet chamber). Severe vibration of the mine car can easily lead to leakage or detachment of downstream nozzles or pipelines, causing pressure loss in the outlet chamber. This prevents the piston from establishing an effective pressure difference, resulting in failed action or incomplete stroke, and partial or complete failure of the fire extinguishing function.

[0004] Secondly, mining environments often involve extreme conditions such as low temperatures, high humidity, and high temperatures. Under prolonged static conditions, the piston's sealing ring is prone to adhesion to the valve body's inner wall due to oil, moisture, or chemical crystallization. In the event of a fire, the piston may become stuck and unable to operate normally, leading to fire suppression failure. Simultaneously, the piston and sealing ring endure high-pressure static sealing for extended periods, making the materials susceptible to permanent deformation, further weakening sealing performance and operational reliability. Furthermore, in some existing designs, the piston and sealing ring are in direct contact with corrosive agents for extended periods, which accelerates material aging and corrosion, affecting the integrity of the seal.

[0005] Based on the above problems, there is an urgent need for a chemical control valve for a mine vehicle-mounted fire extinguishing system, so as to achieve long-term stable and reliable triggering and full opening in the space-constrained and harsh environment of mining, thereby ensuring the effectiveness of the fire protection system. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a chemical control valve for a mine vehicle-mounted fire extinguishing system.

[0007] The technical solution of the present invention includes:

[0008] The valve body has a pressure accumulator chamber and a drive chamber, and a puncturable sealing isolation element is provided between the pressure accumulator chamber and the drive chamber;

[0009] The composite piston assembly is axially movable within the drive chamber and can puncture the sealing isolation member under the drive of an external starting force;

[0010] The composite piston assembly includes a primary piston assembly and a secondary piston assembly. The secondary piston assembly can move relative to the primary piston assembly under the action of the drug flow from the accumulator chamber after the sealing isolation element is punctured, so as to open the flow channel from the drive chamber to the main channel outlet.

[0011] A further technical solution is that the first-stage piston assembly includes a first-stage piston section that dynamically seals with the inner wall of the drive chamber and a mounting section facing the sealing isolator. The mounting section is provided with a puncturing part for puncturing the sealing isolator.

[0012] A further technical solution is as follows: the first-stage piston assembly is an overall frustum-shaped frame structure, and the outer diameter of the first-stage piston section is larger than the outer diameter of the mounting section; a drive spring is pre-compressed in the drive chamber, and the two axial ends of the drive spring abut against the inlet end face of the drive chamber and the end face of the first-stage piston section, respectively; a limiting ring is also provided in the drive chamber on the side of the first-stage piston section facing away from the sealing isolation element, and the first-stage piston section abuts against the limiting ring axially under the pre-compression of the drive spring.

[0013] A further technical solution is as follows: one end of the first-stage piston section facing away from the sealing isolation member is provided with an axial annular cavity, and the annular cavity is connected to the driving cavity through a guide port; the second-stage piston assembly includes a second-stage piston section, which is slidably accommodated in the annular cavity, and its outer periphery forms a dynamic sealing fit with the inner wall of the annular cavity.

[0014] A further technical solution is that the piercing part adopts a triangular pyramid-shaped blade tip structure design, with its three edges forming a cutting edge.

[0015] A further technical solution is as follows: the secondary piston assembly further includes a connecting rod and a pre-tightening head; the connecting rod is arranged axially, with one end connected to the secondary piston section and the other end passing through the primary piston section and connected to the pre-tightening head; the pre-tightening head abuts against the end face of the mounting section opposite to the puncture part by a pressure relief spring pre-pressed between the pre-tightening head and the primary piston section.

[0016] A further technical solution is that a first sealing ring is provided on the outer periphery of the first-stage piston section, and the first sealing ring is dynamically sealed to the inner wall of the drive cavity.

[0017] A further technical solution is as follows: a starting chamber is coaxially provided on the side of the driven chamber facing away from the sealing isolation member. In the initial state, the two are sealed and isolated by the composite piston assembly. The valve body is provided with a starting gas interface that communicates with the starting chamber for introducing starting gas to drive the composite piston assembly to move axially.

[0018] A further technical solution is that the inner diameter of the accumulator chamber is smaller than the inner diameter of the drive chamber.

[0019] A further technical solution is as follows: a diaphragm cavity is coaxially provided between the accumulator cavity and the drive cavity; the sealing and isolation component is a diaphragm, and the diaphragm is pressed and sealed on the end face of the diaphragm cavity by a diaphragm pressure ring.

[0020] The beneficial technical effects of this invention are:

[0021] (1) The composite piston assembly adopts a composite design of a primary piston assembly and a secondary piston assembly, which decomposes the opening action of the control valve into two logically coherent steps: the composite piston assembly is driven by an external starting force to move axially and puncture the sealing isolation piece to realize the connection between the driving chamber and the accumulator chamber; then the pressure of the drug flow released in the accumulator chamber autonomously drives the secondary piston assembly to move relative to the primary piston assembly to complete the final opening of the control valve. The entire opening process is reliable.

[0022] (2) Meanwhile, since the first-stage piston assembly and the second-stage piston assembly do not need to bear the high-pressure sealing task during long-term standby, and only bear pressure briefly at the moment of working trigger, the risk of failure of the first sealing ring and the second sealing ring under long-term high-pressure sealing is greatly reduced.

[0023] (3) Furthermore, the isolation design of the drive chamber and the accumulator chamber in the initial state effectively prevents the corrosive agent from corroding and crystallizing the first piston section, the first sealing ring, the second piston section and the second sealing ring, ensuring reliable operation.

[0024] (4) Finally, the control valve integrates the triggering, opening and releasing functions into one valve body, which greatly simplifies the system pipeline, saves installation space and cost, and is very suitable for mining fire protection scenarios with limited space, harsh environment and high reliability requirements. Attached Figure Description

[0025] Figure 1 This is a first-view schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a second-view schematic diagram of the overall structure of the present invention;

[0027] Figure 3 This is an axial sectional view of the overall structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the installation position of the sealing and isolation structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the specific structure of the composite piston assembly of the present invention;

[0030] Figure 6 This is a schematic diagram of the location of the flow guide port of the present invention;

[0031] Figure 7 This is an axial cross-sectional schematic diagram of the composite piston assembly of the present invention;

[0032] Among them: 100, valve body;

[0033] 1. Accumulation chamber; 2. Drive chamber; 3. Sealing and isolation structure; 31. Sealing and isolation component; 32. Diaphragm pressure ring; 4. Composite piston assembly; 41. First-stage piston assembly; 411. First-stage piston section; 412. Mounting section; 413. Puncture part; 414. Drive spring; 42. Second-stage piston assembly; 421. Second-stage piston section; 422. Connecting rod; 423. Pre-tightening pressure head; 424. Pressure relief spring; 425. Annular cavity; 426. Guide port; 43. Limiting ring; 44. First sealing ring; 45. Second sealing ring; 5. Diaphragm cavity; 6. Start-up chamber; 7. Start-up gas interface; 8. Main flow outlet; 9. Accumulated gas filling port; 10. Safety release port; 11. Siphon tube connection port; 12. Auxiliary outlet; 13. Pressure relief channel; 14. Pressure relief port. Detailed Implementation

[0034] In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] like Figures 1 to 7 As shown, the agent control valve of the mine vehicle fire extinguishing system of the present invention includes a valve body 100. The valve body 100 has a pressure accumulator 1 and a drive chamber 2 arranged sequentially along the axial direction inside. The pressure accumulator 1 and the drive chamber 2 are isolated by a sealing isolation structure 3. The sealing isolation structure 3 includes a puncturable sealing isolation element 31.

[0036] The accumulator chamber 1 is connected to the medicine bottle and is pre-filled with pressurized gas. The drive chamber 2 is connected to an external pipeline and contains a composite piston assembly 4. The composite piston assembly 4 can move axially within the drive chamber 2. One end of the assembly facing the sealing isolator 31 has a puncture part 413. Under the drive of an external starting force, the sealing isolator 31 is punctured to break its sealing isolation state, thereby connecting the accumulator chamber 1 and the drive chamber 2. The pressurized gas then propels the medicine into the drive chamber 2.

[0037] The inner diameter of the accumulator chamber 1 is smaller than the inner diameter of the drive chamber 2. A diaphragm cavity 5 for mounting the sealing and isolation structure 3 is also coaxially provided between the accumulator chamber 1 and the drive chamber 2. The sealing and isolation structure 3 includes a sealing and isolation element 31. In this embodiment, the sealing and isolation element 31 is a diaphragm, and the diaphragm is pressed and sealed to the end face of the diaphragm cavity 5 by a diaphragm pressure ring 32.

[0038] The composite piston assembly 4 includes a primary piston assembly 41 and a secondary piston assembly 42 that are coaxially nested and can move relative to each other. The secondary piston assembly 42 can move relative to the primary piston assembly 41 by the action of the drug flow from the accumulator chamber 1 after the diaphragm is punctured, so as to open the flow channel from the drive chamber 2 to the main channel outlet 8 of the valve body 100.

[0039] Specifically, the first-stage piston assembly 41 has an overall truncated cone-shaped frame structure, including a first-stage piston section 411 with a larger outer diameter and an installation section 412 with a smaller outer diameter. The outer periphery of the first-stage piston section 411 is dynamically sealed to the inner wall of the drive cavity 2 and provides axial guidance for the first-stage piston assembly 41. The puncture part 413 is fixed to the center of the end face of the installation section 412 facing the diaphragm cavity 5.

[0040] Preferably, the piercing part 413 adopts a triangular pyramid-shaped blade structure design, with its three edges forming a sharp cutting edge to create a regular triangular cut when piercing the diaphragm. This effectively prevents diaphragm material fragments from clogging the downstream nozzle and ensures the initial flow area of ​​the opening channel. At the same time, under the impact of the high-pressure agent flow from the accumulator chamber 1, the regular triangular cut makes it easier for the diaphragm to be further torn along the edge of the triangular cut, thereby quickly opening the flow channel and ensuring the high-speed release of the agent flow.

[0041] The drive chamber 2 is also provided with a limiting ring 43 located on the side of the first-stage piston section 411 facing away from the diaphragm cavity 5. A drive spring 414 is pre-compressed in the drive chamber 2. The two axial ends of the drive spring 414 abut against the inlet end face of the drive chamber 2 and the end face of the first-stage piston section 411, respectively. Under the pre-compression of the drive spring 414, the first-stage piston section 411 abuts against the limiting ring 43 in the axial direction to prevent it from falling out.

[0042] The secondary piston assembly 42 is housed inside the drive piston section. The secondary piston assembly 42 includes, along the axial direction, a secondary piston section 421, a connecting rod 422, and a pre-tightening head 423. The end of the primary piston section 411 facing away from the diaphragm cavity 5 is provided with an axial annular cavity 425, and the end facing the diaphragm cavity 5 is provided with a guide port 426. The annular cavity 425 is connected to the drive cavity 2 through the guide port 426. The secondary piston section 421 is embedded in the annular cavity 425, and its outer circumference forms a dynamic seal with the inner wall of the annular cavity 425, and it works with the primary piston section 411 to bear the pressure. The connecting rod 422 is arranged axially, with one end connected to the secondary piston section 421 and the other end passing through the primary piston section 411 and connected to the pre-tightening head 423. A pressure relief spring 424 is pre-compressed between the pre-tightening head 423 and the primary piston section 411. Under the pre-pressure of the pressure relief spring 424, the pre-tightening head 423 axially abuts against the end face of the mounting section 412 facing away from the puncture part 413, thereby determining the initial axial position of the secondary piston assembly 42. At this time, the secondary piston section 421 connected to the pre-tightening head 423 is synchronously pushed into the annular cavity 425 and forms a sealing fit with the inner wall of the annular cavity 425 to isolate the passage between the drive chamber 2 and the main channel outlet 8 of the valve body 100, forming an initial seal.

[0043] To ensure a dynamic sealing fit between the outer periphery of the first-stage piston section 411 and the inner wall of the drive cavity 2, a first sealing ring 44 is provided on the outer periphery of the first-stage piston section 411; to ensure a dynamic sealing fit between the outer periphery of the second-stage piston section 421 and the inner wall of the annular cavity 425 of the first-stage piston section 411, a second sealing ring 45 is provided on the outer periphery of the second-stage piston section 421. In this embodiment, both the first sealing ring 44 and the second sealing ring 45 are made of EPM ethylene propylene diene monomer rubber to ensure reliable operation within a wide temperature range of -40℃ to 150℃.

[0044] In this embodiment, the driving chamber 2 is coaxially provided with a starting chamber 6 on the side opposite to the diaphragm chamber 5. The main channel outlet 8 is coaxially arranged with and communicates with the starting chamber 6 to connect to an external pipeline. In the initial state, the starting chamber 6 and the driving chamber 2 are sealed and isolated by the composite piston assembly 4. The valve body 100 is also provided with a starting gas interface 7 communicating with the starting chamber 6. The starting gas interface 7 is used to introduce starting gas and build pressure in the starting chamber 6 to push the composite piston assembly 4 toward the diaphragm chamber 5 and puncture the diaphragm.

[0045] The outer wall of the valve body 100 is also provided with a accumulator gas filling port 9 and a safety relief port 10, which are connected to the accumulator chamber 1. A siphon tube connection port 11 is also provided at the axial end of the accumulator chamber 1, which is connected to the siphon tube of the medicine bottle. The accumulator gas filling port 9 is used to pre-charge or replenish the accumulator gas into the accumulator chamber 1. A pressure relief diaphragm is installed at the safety relief port 10. When the pressure in the accumulator chamber 1 abnormally rises and exceeds a set value, the pressure relief diaphragm ruptures, rapidly releasing the pressure to ensure safety.

[0046] Furthermore, the threaded connection structure of the siphon tube connection port 11 is provided with a pressure relief channel 13. One end of the pressure relief channel 13 is connected to the inner cavity of the medicine bottle, and the other end is connected to the pressure relief port 14 on the outer wall of the valve body 100.

[0047] Preferably, a pressure gauge is installed on the pressure relief port 14 to achieve pressure monitoring and pressure relief functions. By removing and installing the pressure gauge, the pressure relief channel 13 can be activated or deactivated to perform corresponding operations.

[0048] When it is necessary to disassemble the medicine bottle, the gas pressure inside the bottle can be safely released by removing the pressure gauge, ensuring operational safety. In low-pressure environments, removing the pressure gauge to release some gas can adjust the pressure inside the medicine bottle to a safe working pressure. In addition, when pressure is released through the pressure relief channel 13 and the pressure relief port 14, a pressure difference is created, which allows the residual medicine in the siphon tube and pipeline to flow back to the medicine bottle, avoiding blockage.

[0049] In this embodiment, to ensure the reliability and safety of the connection between the valve body 100 and the external pipeline and various functional components, the inner walls of the starting gas interface 7, the main channel outlet 8, the accumulator gas filling port 9, the safety relief port 10, the siphon pipe connection port 11, and the pressure relief port 14 are all machined with connecting threads. Each connecting thread is coated with thread-locking adhesive during assembly to resist the risk of thread loosening that may be caused by the continuous vibration and impact of the mine car.

[0050] The working process is as follows: When the system receives a start signal, start gas is rapidly injected into the start chamber 6 through the start gas interface 7. The pressure inside the start chamber 6 rises sharply. This pressure acts on the end faces of the first-stage piston section 411 and the second-stage piston section 421 facing the start chamber 6, pushing the entire compound piston assembly 4 to compress the drive spring 414 and continuously move axially towards the diaphragm until the puncture part 413 punctures the diaphragm, completing the connection between the accumulator chamber 1 and the drive chamber 2. The pre-charged high-pressure accumulator gas in the accumulator chamber 1 immediately expands, releasing its stored high-pressure potential energy. The expanding gas acts directly on the agent in the accumulator chamber 1, generating a huge thrust to propel the agent at high speed into the connected drive chamber 2. High-speed agent flow acts on the end faces of the first-stage piston section 411 and the second-stage piston section 421 facing the diaphragm cavity 5, respectively, to push the entire composite piston assembly 4 towards the activation cavity 6 until the first-stage piston section 411 axially abuts against the limiting ring 43. Meanwhile, the high-speed agent flow acting on the second-stage piston section 421 continues to overcome the pre-pressure of the pressure relief spring 424, pushing the second-stage piston section 421 towards the activation cavity 6 until the second-stage piston section 421 disengages from the annular cavity 425. This allows the agent flow to enter the annular cavity 425 through the guide port 426 and then enter the activation cavity 6. Finally, it flows into the external pipeline through the main channel outlet 8, ultimately forming a fire extinguishing jet that is ejected at high speed from the fire extinguishing nozzle.

[0051] Furthermore, the outer wall of the valve body 100 is also provided with an auxiliary outlet 12 that communicates with the drive chamber 2. Activating the auxiliary outlet 12 allows for physical isolation between the detection pipeline and the agent release pipeline. This means that the slender detection pipeline can be flexibly deployed to the most flammable corners, while the larger agent release pipeline can be laid along a more optimized path, finally covering all areas through several nozzles. The entire system layout is more flexible, adapting to scenarios with complex fire hazard distribution and limited space, such as the mine car engine compartment, battery box, and hydraulic station. When the system adopts a single-line mode, it can be sealed using plugs that conform to pipeline standards.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A chemical control valve for a mine vehicle-mounted fire extinguishing system, characterized in that: include: The valve body (100) is provided with a pressure accumulator (1) and a drive chamber (2) and a puncturable sealing isolation element (31) is provided between the pressure accumulator (1) and the drive chamber (2). The composite piston assembly (4) is axially movable within the drive chamber (2) and punctures the sealing isolation member (31) under the drive of an external starting force. The composite piston assembly (4) includes a primary piston assembly (41) and a secondary piston assembly (42). The secondary piston assembly (42) can move relative to the primary piston assembly (41) by the action of the drug flow from the accumulator (1) after the sealing isolation member (31) is punctured, so as to open the flow channel from the drive chamber (2) to the main channel outlet (8) of the valve body (100).

2. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 1, characterized in that: The first-stage piston assembly (41) includes a first-stage piston section (411) that dynamically seals with the inner wall of the drive chamber (2) and a mounting section (412) facing the sealing isolator (31), wherein the mounting section (412) is provided with a puncture part (413) for puncturing the sealing isolator (31).

3. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 2, characterized in that: The first-stage piston assembly has a truncated cone-shaped frame structure. The outer diameter of the first-stage piston section (411) is larger than the outer diameter of the mounting section (412). A drive spring (414) is pre-pressed in the drive chamber (2). The two ends of the drive spring (414) abut against the inlet end face of the drive chamber (2) and the end face of the first-stage piston section (411), respectively. A limiting ring (43) is also provided in the drive chamber (2) on the side of the first-stage piston section (411) facing away from the sealing isolation member (31). The first-stage piston section (411) abuts against the limiting ring (43) axially under the pre-pressure of the drive spring (414).

4. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 3, characterized in that: The first-stage piston section (411) has an axial annular cavity (425) at one end facing away from the sealing isolation member (31). The annular cavity (425) is connected to the drive cavity (2) through the guide port (426). The second-stage piston assembly (42) includes a second-stage piston section (421). The second-stage piston section (421) is slidably housed in the annular cavity (425), and its outer periphery forms a dynamic sealing fit with the inner wall of the annular cavity (425).

5. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 4, characterized in that: The secondary piston assembly (42) further includes a connecting rod (422) and a pre-tightening head (423); the connecting rod (422) is arranged axially, with one end connected to the secondary piston section (421) and the other end passing through the primary piston section (411) and connected to the pre-tightening head (423); the pre-tightening head (423) abuts against the end face of the mounting section (412) facing away from the puncture part (413) by a pressure relief spring (424) pre-pressed between the pre-tightening head (423) and the primary piston section (411).

6. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 2, characterized in that: The outer periphery of the first-stage piston section (411) is provided with a first sealing ring (44), which dynamically seals with the inner wall of the drive cavity (2).

7. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 2, characterized in that: The piercing part (413) adopts a triangular pyramid-shaped blade tip structure design, with its three edges forming a cutting edge.

8. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 1, characterized in that: The driven cavity (2) is coaxially provided with a starting cavity (6) on the side opposite to the sealing isolation member (31). In the initial state, the two are sealed and separated by the composite piston assembly (4). The valve body (100) is provided with a starting gas interface (7) that communicates with the starting cavity (6) for introducing starting gas to drive the composite piston assembly (4) to move axially.

9. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 1, characterized in that: The inner diameter of the accumulator chamber (1) is smaller than the inner diameter of the drive chamber (2).

10. The agent control valve of the mine vehicle-mounted fire extinguishing system according to claim 9, characterized in that: A diaphragm cavity (5) is coaxially located between the accumulator cavity (1) and the drive cavity (2); the sealing isolation element (31) is a diaphragm, and the diaphragm is pressed and sealed on the end face of the diaphragm cavity (5) by a diaphragm pressure ring (32).

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