Fire truck pressure relief tank

Abstract

The utility model relates to the field of fire-fighting equipment, concretely relates to a fire engine pressure relief tank, including setting the tank lid on the tank mouth department of tank body, the tank lid includes the apron, the apron is equipped with the boss part to the one side of tank body, be equipped with the cavity between the boss part with the apron, the tank lid is vertically equipped with the elastic connecting rod, the elastic connecting rod one end is connected with the tank lid, the other end swing joint has the pressure arm, the lateral wall of tank body tank mouth is equipped with the mounting seat, the mounting seat is vertically connected with horizontal rotary seat, horizontal rotary seat can carry out horizontal rotation on the mounting seat, the pressure arm one end is hinged with horizontal rotary seat, the other end is connected with the tank mouth department of tank body and is connected, compared with traditional pressure relief tank, the utility model can realize the self -adaptation pressure -relief through the cavity in the tank lid and the cooperation of elastic connecting rod, has reduced the risk that the tank body breaks down due to the pressure is too big in the pressure relief tank.

Description

Technical Field

[0001] This utility model relates to the field of fire-fighting equipment, and in particular to a pressure relief tank for fire trucks. Background Technology

[0002] Currently, fire trucks are widely used in various emergency rescue and firefighting scenarios. Their water tanks, as key components for storing firefighting water, play a crucial role in ensuring the continuity and efficiency of firefighting operations. Conventional fire truck water tanks are replenished via an external water source, typically manually filled by operators before or during a mission. However, in actual use, a problem arises where the internal pressure of the tank abnormally increases during the filling process.

[0003] Specifically, during the filling process of existing fire truck water tanks, if operators fail to stop filling in time, or if filling continues due to valve malfunctions, the internal pressure will continuously increase once the tank is full and the space inside is sealed. Since most existing tank covers are one-way pressure relief structures or rigid structures, they cannot adjust or release excess pressure according to pressure changes, easily causing the tank to expand and deform, and in severe cases, even rupture. This not only affects the normal use of the fire truck but may also endanger the personal safety of the operators. Furthermore, the top of the existing fire truck tank requires the installation of fire ladders, suction pipes, level gauges, water injection bends, fire monitors, etc., which restricts the installation and operation space of the pressure relief tank cover. Especially when firefighters open the pressure relief tank cover, the limited space often results in the cover being partially open or requiring other obstacles to be removed before use, making operation inconvenient. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of existing fire truck pressure relief tanks, where the tank body and tank cover are mostly unidirectional pressure relief or rigidly connected, which easily leads to the risk of tank body rupture when the water pressure inside the tank is too high, and to provide a fire truck pressure relief tank.

[0005] In a first aspect, the present invention provides a fire truck pressure relief tank, including a tank cover disposed at the tank opening of the tank body. The tank cover includes a cover plate, and a protrusion is provided on the side of the cover plate facing the tank body. A cavity is provided between the protrusion and the cover plate. An elastic connecting rod is vertically provided on the tank cover. One end of the elastic connecting rod is connected to the tank cover, and the other end is movably connected to a pressure arm. The side wall of the tank opening is provided with a mounting base, and a horizontal rotating seat is vertically connected to the mounting base. The horizontal rotating seat can rotate horizontally on the mounting base. One end of the pressure arm is hinged to the horizontal rotating seat, and the other end is engaged with the tank opening of the tank.

[0006] This utility model provides a pressure relief tank for fire trucks. The tank lid adopts a double-layer design combining a cover plate and a raised section, with a cavity between the cover plate and the raised section. The raised section below the cover plate increases the overall weight of the tank lid, while the cavity between the cover plate and the raised section reduces the overall density of the tank lid. Furthermore, a pressure arm is provided on the tank body. The longitudinal displacement of the tank lid is restricted by the engagement of the pressure arm with the tank body, thus pressing the tank lid tightly. This design, through the combination of a cover plate and a raised section with a cavity between them, allows the tank lid to maintain strength while reducing its overall density, thereby providing a certain degree of buoyancy response. When the tank is not full of liquid, the composite structure formed by the cover plate and the raised section effectively increases the self-weight of the tank lid, thereby improving the sealing fit of the lid opening and enhancing the sealing performance under normal operating conditions. In conjunction with the limiting and clamping action of the pressure arm, the tank cover can remain stable and prevent leakage under complex operating conditions such as fire truck movement and vibration. Furthermore, the tank cover and pressure arm are connected by an elastic connecting rod. One end of the elastic connecting rod is connected to the tank cover, and the other end is movably connected to the pressure arm. When the fire truck experiences bumps during travel, the elastic connecting rod can cushion the impact, achieving stable downward pressure on the tank cover. Additionally, when the liquid level inside the tank exceeds the set level (full state), the liquid will exert an upward buoyancy force on the tank cover. Because the tank cover uses a cavity structure between the cover plate and the boss, the overall density of the tank cover is low, thus possessing good buoyancy characteristics. Under the action of liquid buoyancy, the entire tank cover will float upward without detaching from the tank opening. During this process, the elastic connecting rod provides a certain axial elastic stroke. When the can lid is pushed by the buoyancy of the liquid, the elastic connecting rod allows the can lid to float in the axial direction, while limiting the floating amplitude through its elastic recovery characteristics. This ensures that the can lid remains effectively fitted to the can opening without completely detaching. The combination of the cavity and the elastic connecting rod creates a buoyancy-controlled pressure relief gap between the can lid and the can opening. The size of this gap can be dynamically adjusted according to changes in liquid buoyancy, thus achieving a balance between the internal pressure of the can and the drainage capacity (i.e., the higher the internal liquid level, the greater the buoyancy, the larger the gap, and the faster the drainage speed; conversely, the lower the liquid level, the smaller the gap, and the slower the drainage). Compared to traditional... This invention relates to a pressure relief tank. The tank lid's cavity, in conjunction with an elastic connecting rod, enables adaptive pressure relief, reducing the risk of tank rupture due to excessive pressure. The tank opening is equipped with a mounting base, on which a horizontal rotating seat is connected via a rotating pin. One end of the horizontal rotating seat is hinged to a pressure arm. This allows the pressure arm to rotate and move in a circular motion, bypassing obstruction, by rotating the horizontal rotating seat hinged to it. This improves ease of use.

[0007] Preferably, the pressure arm includes a first articulated arm, the first articulated arm includes a straight arm, one end of the straight arm is provided with a first curved arm, the first curved arm is bent toward the can body, the other end of the straight arm is provided with a second curved arm, and the straight arm is located in the area above the can lid.

[0008] Preferably, the straight arm is provided with a vertical connecting hole, and the straight arm is connected to the elastic connecting rod through the connecting hole.

[0009] Preferably, the elastic connecting rod includes a vertical rod, one end of which is connected to the can lid, and the other end passes through the connecting hole and is connected to a clamping nut. A spring is sleeved on the outer wall of the vertical rod.

[0010] The elastic connecting rod includes a vertical rod, one end of which is fixedly connected to the can lid, and the other end passes through a connecting hole on the pressure arm and is fixed by a clamping nut. The structure is simple and easy to assemble, effectively achieving an adjustable elastic connection between the can lid and the pressure arm. By setting the clamping nut, the preload of the elastic connection can be adjusted to adapt to the requirements of pressure relief sensitivity and can lid floating displacement under different working conditions. Simultaneously, a spring is fitted on the outer wall of the vertical rod, allowing it to compress or extend axially when subjected to buoyancy or pressure changes, providing a stable rebound force. This spring not only enhances the sealing and clamping effect of the can lid in the non-pressure relief state but also buffers and guides the can lid's floating during pressure relief, preventing the can lid from violently rising due to sudden changes in buoyancy, effectively improving the smoothness and safety of the pressure relief operation.

[0011] Preferably, one end of the first curved arm is connected to the straight arm, and the other end is provided with a hinge portion. The first curved arm is hinged to the horizontal rotating seat through the hinge portion.

[0012] Preferably, a second joint arm is hinged to the second curved arm, the second joint arm is provided with a through groove, and one end of the second curved arm passes through the through groove and is hinged to the second joint arm.

[0013] By setting a through groove on the second articulated arm and allowing the second curved arm to pass through the through groove and hinge with the second articulated arm, the second articulated arm can adjust its position around its hinge point during the subsequent locking process, so that it can be successfully locked with the tank. After locking, because the second curved arm passes through the through groove of the second articulated arm, when the tank cover is lifted by buoyancy, the second curved arm can limit the second articulated arm, reduce the rotation angle of the second articulated arm, and reduce the risk of locking failure between the second articulated arm and the tank.

[0014] Preferably, a limiting device is provided at the mouth of the tank, and a hook is provided at one end of the second joint arm. The hook is configured to engage with the limiting device when the second joint arm is pressed down.

[0015] Preferably, the limiting device includes two symmetrically arranged brackets, and the two brackets are connected by a transverse connecting rod.

[0016] Preferably, the end of the second articulated arm away from the hook is provided with a handle.

[0017] Preferably, a return spring is connected to the straight arm, with one end of the return spring connected to the straight arm and the other end connected to the second articulated arm.

[0018] A return spring is connected to the straight arm, with one end connected to the straight arm and the other end connected to the second articulated arm. After the pressure relief action is completed, the spring's rebound force can automatically drive the second articulated arm back to its initial position, realizing the automatic reset of the pressure arm. This effectively improves the self-recovery capability of the device, avoids manual intervention, and improves operating efficiency. The return spring structure can also provide a certain damping and buffering effect during the floating displacement of the can cover due to buoyancy, preventing the pressure arm from moving too fast or swinging too much, which could cause structural impact or loss of control, and enhance the system's operational stability and reliability.

[0019] Preferably, the can lid has a flanged structure on its outer periphery, and a sealing ring is embedded in the flanged structure. The sealing ring is configured to fit into the can opening of the can body.

[0020] The can lid has a flanged structure on the outside, and a sealing ring is embedded in the flanged structure. The surrounding design of the flanged structure makes the can lid form a stable fit when covering the can opening, which enhances the fitting accuracy between the sealing ring and the can opening, thereby significantly improving the sealing performance of the entire pressure relief can and preventing liquid leakage or gas escape.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model provides a pressure relief tank for fire trucks. The tank cover adopts a double-layer design combining a cover plate and a raised portion, with a cavity between the cover plate and the raised portion. The raised portion below the cover plate increases the weight of the entire tank cover, while the cavity between the cover plate and the raised portion reduces the density of the entire tank cover. Furthermore, a pressure arm is provided on the tank body. The longitudinal displacement of the tank cover is restricted by the engagement of the pressure arm with the tank body, thus pressing the tank cover tightly. This design, by combining a cover plate and a raised portion with a cavity between them, allows the tank cover to maintain strength while reducing its overall density, thereby providing a certain buoyancy response characteristic. When the tank is not full of liquid, the composite structure formed by the cover plate and the raised portion effectively increases the self-weight of the tank cover, thereby improving the sealing fit of the cover opening and enhancing the sealing performance under normal operating conditions. In conjunction with the limiting and clamping action of the pressure arm, the tank cover can remain stable and prevent leakage under complex operating conditions such as fire truck movement and vibration. Furthermore, the tank cover and pressure arm are connected by an elastic connecting rod. One end of the elastic connecting rod is connected to the tank cover, and the other end is movably connected to the pressure arm. When the fire truck experiences bumps during travel, the elastic connecting rod can cushion the impact, achieving stable downward pressure on the tank cover. Additionally, when the liquid level inside the tank exceeds the set level (full state), the liquid will exert an upward buoyancy force on the tank cover. Because the tank cover uses a cavity structure between the cover plate and the boss, the overall density of the tank cover is low, thus possessing good buoyancy characteristics. Under the action of liquid buoyancy, the entire tank cover will float upward without detaching from the tank opening. During this process, the elastic connecting rod provides a certain axial elastic stroke. When the can lid is pushed by the buoyancy of the liquid, the elastic connecting rod allows the can lid to float in the axial direction, while limiting the floating amplitude through its elastic recovery characteristics. This ensures that the can lid remains effectively fitted to the can opening without completely detaching. The combination of the cavity and the elastic connecting rod creates a buoyancy-controlled pressure relief gap between the can lid and the can opening. The size of this gap can be dynamically adjusted according to changes in liquid buoyancy, thus achieving a balance between the internal pressure of the can and the drainage capacity (i.e., the higher the internal liquid level, the greater the buoyancy, the larger the gap, and the faster the drainage speed; conversely, the lower the liquid level, the smaller the gap, and the slower the drainage). Compared to traditional... This invention relates to a pressure relief tank. The tank lid's cavity, in conjunction with an elastic connecting rod, enables adaptive pressure relief, reducing the risk of tank rupture due to excessive pressure. The tank opening is equipped with a mounting base, on which a horizontal rotating seat is connected via a rotating pin. One end of the horizontal rotating seat is hinged to a pressure arm. This allows the pressure arm to rotate and move in a circular motion, bypassing obstruction, by rotating the horizontal rotating seat hinged to it. This improves ease of use. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the pressure relief tank of the fire truck in this utility model; Figure 2 This is a diagram showing the cavity of the pressure relief tank in the fire truck of this utility model; Figure 3 In this utility model Figure 2 Enlarged view of point A; Figure 4 This is a structural diagram of the tank in this utility model; Figure 5 In this utility model Figure 4 Enlarged view of point B; Figure 6 This is a cross-sectional view of the pressure relief tank of the fire truck in this utility model; Figure 7 In this utility model Figure 6 Enlarged view of point C; Figure 8 This is a schematic diagram of the pressure arm in this utility model; Figure 9 This is a schematic diagram of the structure of the first joint arm in this utility model; Figure 10 This is an exploded structural diagram of the pressure arm in this utility model; Figure 11 This is a schematic diagram of the structure of the second joint arm in this utility model.

[0023] The markings in the diagram are: 1-Tank body; 2-Tank lid; 21-Lid plate; 22-Boss; 23-Flanged structure; 231-Sealing ring; 3-Cavity; 4-Elastic connecting rod; 41-Vertical rod; 42-Spring; 43-Pressure nut; 5-Pressure arm; 51-First joint arm; 511-Straight arm; 5111-Connecting hole; 512-First bent arm; 5121-Hinge; 513-Second bent arm; 52-Second joint arm; 521-Through groove; 522-Hook; 523-Handle; 6-Mounting base; 7-Horizontal rotating base; 8-Limiting device; 9-Reset spring. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0025] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0027] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0028] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0029] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0030] Example 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The fire truck pressure relief tank shown includes a tank body 1 for containing liquid. The tank body 1 has an opening at its top, and is connected to a tank cover 2 via the opening. The tank cover 2 includes a cover plate 21, with a protrusion 22 below the cover plate 21. The protrusion 22 protrudes towards the bottom of the tank body 1, and a cavity 3 is provided between the cover plate 21 and the protrusion 22. The protrusion 22 below the cover plate 21 increases the weight of the tank cover 2. A mounting base 6 is also provided at the opening of the tank body 1, with a vertically mounted rotating pin. The mounting base 6 is connected to a horizontal rotating seat via the rotating pin. 7. A pressure arm 5 is hinged to the end of the horizontal rotating seat 7 away from the mounting seat 6. A limiting device 8 is also provided at the opening of the tank body 1. One end of the pressure arm 5 is hinged to the horizontal rotating seat 7, and the other end is engaged with the limiting device 8. An elastic connecting rod 4 is movably connected to the pressure arm 5. One end of the elastic connecting rod 4 is movably connected to the pressure arm 5, and the other end is connected to the tank cover 2. On the one hand, the tank cover 2 adopts a combination design of cover plate 21 and boss part 22, and a cavity 3 is set between the two, so that the overall density of the tank cover 2 is reduced while maintaining strength, thereby possessing a certain buoyancy response characteristic. When the tank body 1 is not full of liquid, the composite structure formed by cover plate 21 and boss part 22 can effectively increase the self-weight of the tank cover 2, thereby improving the sealing fit of the cover opening and enhancing the sealing performance under normal working conditions. In conjunction with the limiting and clamping action of the pressure arm 5, the tank cover 2 can be kept stable and prevented from loosening under complex working conditions such as fire truck movement and vibration, thus avoiding leakage. On the other hand, the tank cover 2 and the pressure arm 5 are connected by an elastic connecting rod 4. One end of the elastic connecting rod 4 is connected to the tank cover 2, and the other end is movably connected to the pressure arm 5. When the fire truck experiences bumps during travel, the elastic connecting rod 4 can buffer the impact and achieve stable downward pressure on the tank cover 2. When the tank body 1 is full of liquid, and the liquid level inside the tank body 1 exceeds the set level (full liquid state), the liquid will exert an upward buoyancy force on the tank cover 2. Due to the structural design of the tank cover 2, which uses a cavity 3 formed between the cover plate 21 and the boss part 22, the overall density of the tank cover 2 is low, thus possessing good buoyancy characteristics. Under the action of liquid buoyancy, the entire tank cover 2 will float upward without detaching from the tank opening. During this process, the elastic connecting rod 4 provides a certain axial elastic stroke. When the can lid 2 is pushed by the buoyancy of the liquid, the elastic connecting rod 4 allows the can lid 2 to float in the axial direction, while limiting the floating amplitude through its elastic recovery characteristics, ensuring that the can lid 2 can still maintain an effective fit with the can opening without completely detaching. The combination of the cavity 3 and the elastic connecting rod 4 forms a pressure relief gap between the can lid 2 and the can opening that is buoyancy-controlled. The size of this gap can be dynamically adjusted with the change of liquid buoyancy, thereby achieving a balance between the internal pressure of the can body 1 and the drainage capacity (i.e., the higher the internal liquid level, the greater the buoyancy, the larger the gap, and the faster the drainage speed; conversely, the gap decreases and the drainage becomes slower). Furthermore, the elastic connecting rod 4 includes a vertical rod 41, one end of which is connected to the can lid 2, and the other end passes through the connecting hole 5111 and is connected to a clamping nut 43. A spring 42 is sleeved on the outer wall of the vertical rod 41. The elastic connecting rod 4 includes a vertical rod 41, one end of which is fixedly connected to the can lid 2, and the other end passes through the connecting hole 5111 on the pressure arm 5 and is fixed by the clamping nut 43. The structure is simple and easy to assemble, and can effectively realize the adjustable elastic connection between the can lid 2 and the pressure arm 5. By setting the clamping nut 43, the preload of the elastic connection can be adjusted to adapt to the requirements of pressure relief sensitivity and floating displacement of the can lid 2 under different working conditions. At the same time, the spring 42 sleeved on the outer wall of the vertical rod 41 enables the vertical rod 41 to be compressed or extended axially when subjected to buoyancy or pressure changes, providing a stable rebound force. The spring 42 not only enhances the sealing and pressing effect of the can lid 2 in the non-depressurized state, but also plays a buffering and guiding role in the floating of the can lid 2 during the depressurization process, preventing the can lid 2 from rising violently due to sudden changes in buoyancy, and effectively improving the stability and safety of the depressurization action.

[0031] In one or more embodiments, the pressure arm 5 includes a first articulated arm 51, the first articulated arm 51 includes a straight arm 511, one end of the straight arm 511 is provided with a first curved arm 512, the first curved arm 512 is bent toward the tank body 1, the other end of the straight arm 511 is provided with a second curved arm 513, and the straight arm 511 is located in the area above the tank lid 2. Furthermore, the straight arm 511 is vertically provided with a connecting hole 5111, through which the straight arm 511 is connected to the elastic connecting rod 4, such as... Figure 8 and Figure 9 As shown.

[0032] In one or more embodiments, one end of the first curved arm 512 is connected to the straight arm 511, and the other end is provided with a hinge portion 5121. The first curved arm 512 is hinged to the horizontal rotating seat 7 through the hinge portion 5121. A second articulated arm 52 is hinged to the second curved arm 513. The second articulated arm 52 has a through groove 521. One end of the second curved arm 513 passes through the through groove 521 and is hinged to the second articulated arm 52. By providing the through groove 521 on the second articulated arm 52 and allowing the second curved arm 513 to pass through the through groove 521 and be hinged to the second articulated arm 52, the second articulated arm 52 can adjust its position around its hinge point during the subsequent locking process, allowing it to successfully lock onto the tank 1. After locking, because the second curved arm 513 passes through the through groove 521 of the second articulated arm 52, when the tank cover 2 is lifted by buoyancy, the second curved arm 513 can limit the rotation angle of the second articulated arm 52, reducing the risk of locking failure between the second articulated arm 52 and the tank 1. Figure 8 , Figure 10 and Figure 11 As shown.

[0033] In one or more embodiments, a limiting device 8 is also provided at the mouth of the tank body 1, and a hook 522 is provided at one end of the second joint arm 52. The hook 522 is configured to engage with the limiting device 8 when the second joint arm 52 is pressed down. Furthermore, the hook 522 is a wedge-shaped hook 522, such as Figure 4 As shown.

[0034] In one or more embodiments, the end of the second articulated arm 52 furthest from the hook 522 is provided with a handle 523, such as... Figure 11 As shown.

[0035] In one or more embodiments, a return spring 9 is connected to the straight arm 511. One end of the return spring 9 is connected to the straight arm 511, and the other end is connected to the second articulated arm 52. After the pressure relief action is completed, the return spring 9 can automatically drive the second articulated arm 52 back to its initial position through the rebound force of the spring 42, realizing the automatic reset of the pressure arm 5. This effectively improves the self-recovery capability of the device, avoids manual intervention, and improves operating efficiency. The return spring 9 structure can also provide a certain damping and buffering effect during the floating displacement of the can cover 2 due to buoyancy, preventing the pressure arm 5 from moving too fast or swinging too much, causing structural impact or loss of control, and enhancing the operational stability and reliability of the system. Figure 10 As shown.

[0036] In one or more embodiments, the can lid 2 is provided with a flanged structure 23 on its outer periphery, and a sealing ring 231 is embedded in the flanged structure 23. The sealing ring 231 is configured to fit into the can opening of the can body 1. The flanged structure 23 on the outer periphery of the can lid 2, and the sealing ring 231 embedded in the flanged structure 23, through the surrounding design of the flanged structure 23, enables the can lid 2 to form a stable fit and positioning when covering the can opening, enhancing the fitting accuracy of the sealing ring 231 and the can opening, thereby significantly improving the sealing performance of the entire pressure relief can and preventing liquid leakage or gas escape. Figure 3 As shown.

[0037] The above are merely preferred embodiments of the present utility model and are 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 should be included within the protection scope of the present utility model.

Claims

1. A fire truck pressure relief tank, comprising a tank cover (2) disposed at the tank opening of a tank body (1), characterized in that, The can lid (2) includes a cover plate (21), and a boss (22) is provided on the side of the cover plate (21) facing the can body (1). A cavity (3) is provided between the boss (22) and the cover plate (21). An elastic connecting rod (4) is vertically provided on the can lid (2). One end of the elastic connecting rod (4) is connected to the can lid (2), and the other end is movably connected to a pressure arm (5). The side wall of the tank opening of the tank body (1) is provided with a mounting seat (6), and a horizontal rotating seat (7) is vertically connected to the mounting seat (6). The horizontal rotating seat (7) can rotate horizontally on the mounting seat (6). One end of the pressure arm (5) is hinged to the horizontal rotating seat (7), and the other end is engaged with the opening of the tank body (1).

2. A fire truck pressure relief tank according to claim 1, characterized in that, The pressure arm (5) includes a first articulated arm (51), which includes a straight arm (511). One end of the straight arm (511) is provided with a first curved arm (512), which bends toward the tank (1). The other end of the straight arm (511) is provided with a second curved arm (513). The straight arm (511) is located in the area above the can lid (2).

3. A fire truck pressure relief tank according to claim 2, characterized in that, The straight arm (511) is provided with a vertical connecting hole (5111), and the straight arm (511) is connected to the elastic connecting rod (4) through the connecting hole (5111).

4. A fire truck pressure relief tank according to claim 3, characterized in that, The elastic connecting rod (4) includes a vertical rod (41), one end of which is connected to the can lid (2), and the other end passes through the connecting hole (5111) and is connected to a clamping nut (43). A spring (42) is sleeved on the outer wall of the vertical rod (41).

5. A fire truck pressure relief tank according to claim 2, characterized in that, One end of the first curved arm (512) is connected to the straight arm (511), and the other end is provided with a hinge (5121). The first curved arm (512) is hinged to the horizontal rotating seat (7) through the hinge (5121).

6. A fire truck pressure relief tank according to claim 2, characterized in that, A second articulated arm (52) is hinged to the second curved arm (513). The second articulated arm (52) is provided with a through groove (521). One end of the second curved arm (513) passes through the through groove (521) and is hinged to the second articulated arm (52).

7. A fire truck pressure relief tank according to claim 6, characterized in that, The can body (1) is also provided with a limiting device (8) at the can opening, and a hook (522) is provided at one end of the second joint arm (52). The hook (522) is configured to engage with the limiting device (8) when the second joint arm (52) is pressed down.

8. A fire truck pressure relief tank according to claim 7, characterized in that, The second articulated arm (52) has a handle (523) at one end away from the hook (522).

9. A fire truck pressure relief tank according to claim 8, characterized in that, A return spring (9) is connected to the straight arm (511), with one end of the return spring (9) connected to the straight arm (511) and the other end connected to the second joint arm (52).

10. A fire truck pressure relief tank according to any one of claims 1-9, characterized in that, The can lid (2) is provided with a flange structure (23) on the periphery, and a sealing ring (231) is embedded in the flange structure (23). The sealing ring (231) is configured to fit into the can opening of the can body (1).

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