Fire extinguishing device in low-voltage switch cabinet

Abstract

The invention discloses a fire extinguishing device in a low-voltage switch cabinet, and relates to the technical field of low-voltage switch cabinets, the fire extinguishing device in the low-voltage switch cabinet comprises a low-voltage power distribution cabinet body, the side surface of the low-voltage power distribution cabinet body is provided with a fire extinguishing agent storage tank, and the top of the fire extinguishing agent storage tank is fixedly connected with a compressed gas storage device; the bottom of the fire extinguishing agent storage tank is provided with a guide bent pipe extending to the inner side of the low-voltage power distribution cabinet body, and the side face of the guide bent pipe is fixedly connected with fire fighting sprayers in a rectangular array mode; wherein the fire extinguishing agent storage tank is provided with a storage tank body with a top opening; according to the fire extinguishing device, compressed gas can carry a fire extinguishing agent stored in the fire extinguishing agent storage tank when flowing quickly, finally, the gas with the fire extinguishing agent is blown to the surface of an internal electronic device through the rotary spray head, so that a fire position is quickly extinguished, meanwhile, the periphery of a fire source is covered, a combustion path is cut off, and the fire extinguishing effect is improved.

Description

Technical Field

[0001] The present invention relates specifically to the technical field of low-voltage switch cabinets, in particular to a fire extinguishing device in a low-voltage switch cabinet. Background Art

[0002] Low-voltage switchgear is an electrical device used in power systems to distribute, control, protect, and measure low-voltage electrical energy. Its operating principle is to distribute the low-voltage electrical energy output from the transformer to each branch through the busbar system, and then use the switchgear to control and protect the electrical energy of each branch. When a circuit fault such as overload or short circuit occurs, the protective device will quickly activate, causing the switchgear to trip and cut off the faulty circuit to protect equipment and personnel. The electrical components and busbars in the switch cabinet are in long-term operation. Due to the influence of environmental factors (such as moisture and dust) and mechanical vibration, the insulation materials may age and break, causing the insulation performance between different phases or between phases and ground to deteriorate, leading to short circuit faults, high temperatures and arcs, and even fires.

[0003] However, in practice, people have noticed that the compressed gas cylinders and dry powder storage bottles of most current fire extinguishing devices are set separately, and they also need to be inspected separately during inspection. They are connected by pipes in the middle, and the connecting pipes also need to be maintained when the gas field is used, which is costly. In addition, when the pipeline is damaged, it cannot be discovered in the first time. After a fire occurs, the compressed gas will be discharged, and after a period of time, the fire extinguishing agent will be sent to the fire location along with the compressed air. The transmission interval of the fire extinguishing agent is long, and the fire cannot be extinguished in the first time, resulting in low efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a fire extinguishing device for use in a low-voltage switchgear cabinet. By interconnecting a storage tank and an arc-shaped tank, compressed gas can not only transport the fire extinguishing agent but also push the remaining fire extinguishing agent downward, ensuring that the compressed gas can carry sufficient fire extinguishing agent for transportation. This prevents insufficient fire extinguishing agent storage, which would result in insufficient compressed gas carrying the fire extinguishing agent, and thus prevents the fire from being effectively extinguished. This improves the fire extinguishing effect during use, thereby resolving the technical problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A fire extinguishing device in a low-voltage switch cabinet includes a low-voltage distribution cabinet body, a fire extinguishing agent storage tank is provided on the side of the low-voltage distribution cabinet body, and the top of the fire extinguishing agent storage tank is fixedly connected to a compressed gas storage device, and the bottom of the fire extinguishing agent storage tank is provided with a guide elbow extending to the inside of the low-voltage distribution cabinet body, and the side of the guide elbow is fixedly connected to a fire sprinkler in a rectangular array; Among them, the fire extinguishing agent storage tank has a storage tank body with an open top, and a sealing piston is movably connected to the inner side of the storage tank body, while the compressed gas storage device has an arc-shaped tank with an open bottom, and the inner side of the arc-shaped tank is connected to the inner side of the storage tank body.

[0006] As a further technical solution of the present invention, the end of the storage tank body is integrally provided with a connecting flange, and the end of the arc tank is integrally provided with a flange plate corresponding to the connecting flange, and the connecting flange and the flange plate are fixedly connected by bolts.

[0007] As a further technical solution of the present invention, an air supply pipe is fixedly connected to the side of the curved tank, and the other end of the air supply pipe is connected to the bottom of the storage tank body, wherein the inner side of the storage tank body stores fire extinguishing agent, and the inner side of the curved tank stores compressed air.

[0008] As a further technical solution of the present invention, a sealing gasket is placed between the storage tank body and the curved tank, and the ends of the storage tank body and the curved tank are respectively provided with a sealing groove and a limiting groove for placing the sealing gasket, and the two sides of the sealing gasket are respectively interference fit with the sealing groove and the limiting groove.

[0009] As a further technical solution of the present invention, a solenoid valve is fixedly connected between the storage tank body and the guide bend pipe, an air intake valve is fixedly connected to the top of the arc tank, and an extended positioning hoop is integrally provided on the side of the arc tank close to the storage tank body and is inserted into the storage tank body.

[0010] As a further technical solution of the present invention, a supporting fire-fighting bracket is fixedly connected to the outer side of the storage tank body, and the side of the fire-fighting bracket is fixedly connected to the low-voltage distribution cabinet body, and a cabinet door is installed on the side of the low-voltage distribution cabinet body away from the fire-fighting bracket.

[0011] As a further technical solution of the present invention, the end of the fire sprinkler is fixedly connected to a conduit, and the conduit passes through the low-voltage distribution cabinet and extends into the interior thereof, and the end of the conduit is connected to a rotating sprinkler.

[0012] As a further technical solution of the present invention, the rotary sprinkler includes a water drum for collecting flow and a special-shaped pipe on its periphery for diverting flow. A bearing is connected through the center of the water drum, and the outer side of the bearing is fixedly connected to the conduit.

[0013] As a further technical solution of the present invention, the water drum is a disc-shaped structure with a hollow interior. The interior of the water drum 821 is movably installed with a first fan blade 826 and a second fan blade 827 from top to bottom. The special-shaped tube is connected to the internal space of the water drum, and a sub-net is fixedly connected to the end opening of the special-shaped tube.

[0014] As a further technical solution of the present invention, the outer side of the special-shaped tube 823 is sleeved with a disconnected tube 825, and multiple groups of rubber damping rings 8251 are provided at the internal inlet position of the disconnected tube 825, and a guide hopper 8252 for liquid guidance is provided on one side of the damping ring 8521, and two groups of integrally molded pressure drums 8253 are fixedly installed at the end of the guide hopper 8252, and the space between the two groups of pressure drums 8253 constitutes a pressure chamber 8254.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, after the solenoid valve is opened, the compressed gas inside the arc tank flows downward through the solenoid valve through the air supply pipe and into the guide elbow. Moreover, the compressed gas will carry the fire extinguishing agent stored in the fire extinguishing agent storage tank when it flows rapidly. Finally, the gas carrying the fire extinguishing agent is blown toward the surface of the internal electronic components through the fire sprinkler, thereby extinguishing the fire at the fire location and covering the area around the fire source, cutting off the combustion path, thereby improving the fire extinguishing effect. In the present invention, since the upper part of the storage tank body is connected to the inner side of the curved tank body, a portion of the compressed air will exert a downward thrust on the sealing piston in the storage tank body, so that the compressed air passing under the storage tank body carries sufficient fire extinguishing agent to flow. In addition, the inverted storage tank body can ensure that the fire extinguishing agent is fully used, preventing the fire extinguishing agent from being unable to be carried by the compressed air when the amount is small, thereby ensuring fire extinguishing while preventing material waste. The present invention guides the fire sprinklers arranged in a rectangular array on the bent pipe to be transported along the conduit to the position of the rotating sprinkler. During this process, the fire extinguishing agent inside the water drum is discharged through the special-shaped pipe and, under the action of the bearing, realizes a rotation process centered on the bearing. At the same time, under the action of the net at the opening at the end of the special-shaped pipe, the fire extinguishing agent is dispersed, which can increase the coverage area of the fire extinguishing agent and thus ensure the fire extinguishing effect. The solenoid valve is electrically driven and can be opened quickly, and the air inlet valve on the top of the arc tank is convenient for replenishing compressed air at any time to ensure sufficient internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention in use state.

[0017] Figure 2 In the present invention Figure 1 Another perspective of the picture.

[0018] Figure 3 In the present invention Figure 1 Schematic diagram of part of the structure.

[0019] Figure 4 In the present invention Figure 3 Schematic diagram of the bottom structure.

[0020] Figure 5It is a schematic diagram of the three-dimensional structure of the compressed gas storage device in the present invention.

[0021] Figure 6 In the present invention Figure 5 A partial enlarged schematic diagram.

[0022] Figure 7 It is a schematic diagram of the disassembled structure of the fire extinguishing agent storage tank in the present invention.

[0023] Figure 8 In the present invention Figure 7 A partial enlarged schematic diagram.

[0024] Figure 9 In the present invention Figure 3 Schematic diagram of the structure of a rotating sprinkler head.

[0025] Figure 10 In the present invention Figure 9 Internal structure diagram.

[0026] Figure 11 In the present invention Figure 9 Diagram of the internal structure of the disconnected tube.

[0027] In the picture: Low-voltage distribution cabinet body 1, cabinet door 2, fire-fighting bracket 3, compressed gas storage device 4, curved tank 41, flange 42, extended positioning hoop 43, limiting groove 44, air supply pipe 45, air inlet valve 5, fire extinguishing agent storage tank 6, storage tank body 61, connecting flange 62, sealing gasket 63, sealing piston 64, sealing groove 65, guide elbow 7, fire sprinkler 8, conduit 81, rotating sprinkler 82, water drum 821, bearing 822, special-shaped pipe 823, distribution network 824, disconnecting pipe 825, damping ring 8251, guide bucket 8252, pressure drum 8253, pressure chamber 8254, first fan blade 826, second fan blade 827, solenoid valve 9. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0029] See also Figure 1-11An embodiment of the present invention provides a fire extinguishing device in a low-voltage switch cabinet, comprising a low-voltage distribution cabinet body 1, a fire extinguishing agent storage tank 6 being provided on the side of the low-voltage distribution cabinet body 1, and a compressed gas storage tank 4 being fixedly connected to the top of the fire extinguishing agent storage tank 6, and a guide elbow 7 extending to the inside of the low-voltage distribution cabinet body 1 being provided at the bottom of the fire extinguishing agent storage tank 6, and a fire sprinkler 8 being fixedly connected to the side of the guide elbow 7 in a rectangular array; Among them, the fire extinguishing agent storage tank 6 has a storage tank body 61 with an opening at the top, and a sealing piston 64 is movably connected to the inner side of the storage tank body 61, while the compressed gas storage device 4 has an arc-shaped tank 41 with an opening at the bottom, and the inner side of the arc-shaped tank 41 is connected to the inner side of the storage tank body 61.

[0030] By adopting the above technical solution, the compressed gas inside the arc tank 41 passes through the air supply pipe 45 downward through the solenoid valve 9 and enters the guide elbow 7. Moreover, the compressed gas will carry the fire extinguishing agent stored in the fire extinguishing agent storage tank 6 when flowing rapidly. Finally, the gas carrying the fire extinguishing agent is blown toward the surface of the internal electronic components through the fire sprinkler 8, thereby extinguishing the fire location and covering the area around the fire source to cut off the combustion path, thereby improving the fire extinguishing effect.

[0031] In this embodiment, the end of the storage tank body 61 is integrally provided with a connecting flange 62, and the end of the arc tank 41 is integrally provided with a flange plate 42 corresponding to the connecting flange 62, and the connecting flange 62 and the flange plate 42 are fixedly connected by bolts.

[0032] Furthermore, an air supply pipe 45 is fixedly connected to the side of the arc tank 41, and the other end of the air supply pipe 45 is connected to the bottom of the storage tank body 61, wherein the inner side of the storage tank body 61 stores fire extinguishing agent, and the inner side of the arc tank 41 stores compressed air.

[0033] To be more specific, a sealing gasket 63 is placed between the storage tank body 61 and the arc tank 41, and a sealing groove 65 and a limiting groove 44 for placing the sealing gasket 63 are respectively opened at the ends of the storage tank body 61 and the arc tank 41, and the two sides of the sealing gasket 63 are respectively interference fit with the sealing groove 65 and the limiting groove 44.

[0034] Furthermore, a solenoid valve 9 is fixedly connected between the storage tank body 61 and the guide bend 7, an air intake valve 5 is fixedly connected to the top of the arc tank 41, and an extension positioning hoop 43 is integrally provided on the side of the arc tank 41 close to the storage tank body 61 and inserted into the storage tank body 61.

[0035] By adopting the above technical solution, since the top of the storage tank body 61 is connected to the inner side of the arc tank 41, a part of the compressed air will exert a downward thrust on the sealing piston 64 in the storage tank body 61, so that the compressed air passing under the storage tank body 61 carries sufficient fire extinguishing agent to flow, and the inverted storage tank body 61 can ensure that the fire extinguishing agent is fully used, preventing the fire extinguishing agent from being unable to be carried by the compressed air when the dose is small, thereby ensuring fire extinguishing while preventing material waste.

[0036] Furthermore, the outer side of the storage tank body 61 is fixedly connected to a supporting fire-fighting bracket 3, and the side of the fire-fighting bracket 3 is fixedly connected to the low-voltage distribution cabinet body 1, and a cabinet door 2 is installed on the side of the low-voltage distribution cabinet body 1 away from the fire-fighting bracket 3.

[0037] More specifically, the fire extinguishing agent inside the storage tank 61 includes but is not limited to dry powder fire extinguishing agent, heptafluoropropane fire extinguishing agent and hexafluoropropane fire extinguishing agent.

[0038] Furthermore, the solenoid valve 9 is electrically connected to an external controller, and a smoke alarm is installed on the inside of the low-voltage distribution cabinet 1, which is also electrically connected to the external controller. After the smoke alarm detects the smell of smoke, it transmits a signal to the external controller, which controls the opening of the solenoid valve 9 through the controller.

[0039] Furthermore, the extended positioning hoop 43 passes through the sealing gasket 63 and is inserted into the arc tank 41, and the extended positioning hoop 43 is located above the sealing piston 64, which can limit the position of the sealing piston 64. After the arc tank 41 and the storage tank body 61 are disassembled, it is convenient to replenish the fire extinguishing agent.

[0040] The end of the fire sprinkler 8 is fixedly connected to a conduit 81 , and the conduit 81 passes through the low-voltage power distribution cabinet 1 and extends into the interior thereof. The end of the conduit 81 is connected to a rotating sprinkler 82 .

[0041] By adopting the above technical solution, high-pressure delivery is achieved through the fire sprinkler 8, and the fire extinguishing agent is centrally delivered to the position of the rotating sprinkler 82 through high pressure; The rotating nozzle 82 includes a water drum 821 for collecting flow and a special-shaped pipe 823 on its periphery for diverting flow. A bearing 822 is connected through the center of the water drum 821, and the outer side of the bearing 822 is fixedly connected to the conduit 81.

[0042] The water drum 821 is a disc-shaped structure with a hollow interior. The first fan blade 826 and the second fan blade 827 are movably installed inside the water drum 821 from top to bottom. The special-shaped tube 823 is connected to the internal space of the water drum 821, and the end opening of the special-shaped tube 823 is fixedly connected to the sub-net 824.

[0043] By adopting the above technical solution, the fire extinguishing agent inside the water drum 821 is discharged through the special-shaped tube 823, and under the action of the bearing 822, a rotation process is realized with the bearing 822 as the center. At the same time, under the action of the net 824 at the opening at the end of the special-shaped tube 823, the fire extinguishing agent is dispersed, realizing a large-scale fire extinguishing process.

[0044] The outer side of the special-shaped tube 823 is sleeved with a disconnected tube 825, and multiple groups of rubber damping rings 8251 are provided at the internal inlet position of the disconnected tube 825. A guide hopper 8252 for liquid guidance is provided on one side of the damping ring 8521, and two groups of integrally formed pressure drums 8253 are fixedly installed at the end of the guide hopper 8252. The space between the two groups of pressure drums 8253 constitutes a pressure chamber 8254.

[0045] By adopting the above technical solution, the disconnected tube 825 is connected to the outside of the special-shaped tube 823 through multiple groups of damping rings 8251. The synergistic effect of the multiple groups of damping rings 8251 provides a certain resistance when the disconnected tube 825 needs to be pulled out, thereby limiting its detachment; at the same time, when the internal liquid pressure or flow rate of the special-shaped tube 823 is small, the fire extinguishing agent will flow out smoothly along the disconnected tube 825 to extinguish a small range of fire. When the internal liquid pressure or flow rate is large, due to the small opening at the end of the disconnected tube 825, excess liquid will accumulate inside the pressure chamber 8254. When the pressure is greater than the resistance of the damping ring 8251, the disconnected tube 825 will be separated from the special-shaped tube 823, thereby realizing a large-scale fire extinguishing process.

[0046] The working principle of the present invention is as follows: when in use, first, the smoke alarm inside the low-voltage distribution cabinet 1 detects smoke and transmits a signal to the external controller. The staff controls the solenoid valve 9 to open through the external controller. At this time, the compressed gas inside the arc tank 41 passes through the air supply pipe 45 downward through the solenoid valve 9 and enters the guide elbow 7. Since the top of the storage tank 61 is connected to the inner side of the arc tank 41, a part of the compressed air will exert a downward thrust on the sealing piston 64 in the storage tank 61, so that the compressed air passing under the storage tank 61 carries sufficient fire extinguishing agent to flow, and the inverted storage tank 61 can ensure that the fire extinguishing agent is fully used. When the compressed gas flows quickly, it will carry the fire extinguishing agent stored in the fire extinguishing agent storage tank 6. Finally, the gas with fire extinguishing agent is transported to the position of the rotating nozzle 82 along the conduit 81 through the fire sprinkler 8; During this process, the fire extinguishing agent inside the water drum 821 is discharged through the special-shaped pipe 823, and under the action of the bearing 822, a rotation process is realized with the bearing 822 as the center; When extinguishing a small fire, the liquid pressure or flow rate inside the special-shaped tube 823 is low, and the fire extinguishing agent will flow out smoothly along the disconnected tube 825, thus extinguishing the fire in a small area. When the liquid pressure or flow rate inside the special-shaped tube 823 is high, the excess liquid will accumulate inside the pressure chamber 8254 due to the small opening at the end of the disconnected tube 825. During large-scale fire extinguishing, that is, when the output fire extinguishing dose is large, the pressure is greater than the resistance of the damping ring 8251, which will cause the disconnected tube 825 to separate from the special-shaped tube 823, thereby realizing a large-scale fire extinguishing process. At the same time, under the action of the net 824 at the opening at the end of the special-shaped tube 823, the fire extinguishing agent is dispersed and blown toward the surface of the internal electronic components, thereby extinguishing the fire location and covering the area around the fire source to cut off the combustion path, thereby improving the fire extinguishing effect.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A fire extinguishing device in a low-voltage switch cabinet, characterized by: The invention comprises a low-voltage power distribution cabinet body (1), a fire extinguishing agent storage tank (6) is provided on the side of the low-voltage power distribution cabinet body (1), and the top of the fire extinguishing agent storage tank (6) is fixedly connected to the compressed gas storage tank (4), and the bottom of the fire extinguishing agent storage tank (6) is provided with a guide elbow (7) extending to the inside of the low-voltage power distribution cabinet body (1), and the side of the guide elbow (7) is fixedly connected to a fire sprinkler (8) in a rectangular array; The fire extinguishing agent storage tank (6) has a storage tank body (61) with an opening at the top, and a sealing piston (64) is movably connected to the inner side of the storage tank body (61), while the compressed gas storage tank (4) has an arc-shaped tank (41) with an opening at the bottom, and the inner side of the arc-shaped tank (41) is communicated with the inner side of the storage tank body (61).

2. The fire extinguishing device in the low-voltage switch cabinet according to claim 1 is characterized in that: The end of the storage tank body (61) is integrally provided with a connecting flange (62), and the end of the arc tank (41) is integrally provided with a flange plate (42) corresponding to the connecting flange (62), and the connecting flange (62) and the flange plate (42) are fixedly connected by bolts.

3. The fire extinguishing device in the low-voltage switch cabinet according to claim 2 is characterized in that: An air supply pipe (45) is fixedly connected to the side of the arc-shaped tank (41), and the other end of the air supply pipe (45) is communicated with the bottom of the storage tank body (61), wherein the inner side of the storage tank body (61) stores fire extinguishing agent, and the inner side of the arc-shaped tank (41) stores compressed air.

4. The fire extinguishing device in the low-voltage switch cabinet according to claim 3 is characterized in that: A sealing gasket (63) is placed between the storage tank body (61) and the arc tank (41), and the ends of the storage tank body (61) and the arc tank (41) are respectively provided with a sealing groove (65) and a limiting groove (44) for placing the sealing gasket (63), and two sides of the sealing gasket (63) are respectively interference-fitted with the sealing groove (65) and the limiting groove (44).

5. The fire extinguishing device in the low-voltage switch cabinet according to claim 4 is characterized in that: A solenoid valve (9) is fixedly connected between the storage tank body (61) and the guide elbow (7), an air intake valve (5) is fixedly connected to the top of the arc tank (41), and an extension positioning hoop (43) inserted into the storage tank body (61) is integrally provided on one side of the arc tank (41) close to the storage tank body (61).

6. The fire extinguishing device in the low-voltage switch cabinet according to claim 5, characterized in that: The outer side of the storage tank (61) is also fixedly connected to a supporting fire-fighting bracket (3), and the side of the fire-fighting bracket (3) is fixedly connected to the low-voltage distribution cabinet (1), and a cabinet door (2) is installed on the side of the low-voltage distribution cabinet (1) away from the fire-fighting bracket (3).

7. The fire extinguishing device in the low-voltage switch cabinet according to claim 1, characterized in that: The end of the fire sprinkler (8) is fixedly connected to a conduit (81), and the conduit (81) passes through the low-voltage power distribution cabinet (1) and extends into the interior thereof. The end of the conduit (81) is connected to a rotating sprinkler (82).

8. The fire extinguishing device in the low-voltage switch cabinet according to claim 7, characterized in that: The rotary spray head (82) comprises a water drum (821) for collecting flow and a special-shaped pipe (823) on its periphery for distributing flow. A bearing (822) is connected through the center of the water drum (821), and the outer side of the bearing (822) is fixedly connected to the conduit (81).

9. The fire extinguishing device in the low-voltage switch cabinet according to claim 8, characterized in that: The water drum (821) is a disc-shaped structure with a hollow interior. A first fan blade (826) and a second fan blade (827) are movably installed inside the water drum (821) from top to bottom. The special-shaped tube (823) is connected to the internal space of the water drum (821), and a subnet (824) is fixedly connected to the end opening of the special-shaped tube (823).

10. The fire extinguishing device in the low-voltage switch cabinet according to claim 9, characterized in that: The outer side of the special-shaped tube (823) is sleeved with a disconnected tube (825), and multiple groups of rubber damping rings (8251) are provided at the internal inlet position of the disconnected tube (825), and a guide hopper (8252) for guiding liquid is provided on one side of the damping ring (8521), and two groups of integrally formed pressure drums (8253) are fixedly installed at the end of the guide hopper (8252), and the space between the two groups of pressure drums (8253) constitutes a pressure chamber (8254).

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