Fire fighting truck tank structure capable of adjusting pressure relief and fire fighting truck

Abstract

The utility model discloses a fire fighting truck tank body structure capable of adjusting pressure relief and a fire fighting truck. The fire fighting truck tank body structure comprises a tank body, at least one outer liquid injection pipe with a switch valve and at least one adjustable pressure relief mechanism, the tank body is used for storing fire-extinguishing liquid; at least one outer liquid injection pipe with a switch valve is arranged on the bottom surface of the tank body and is communicated with the tank body; the at least one adjustable pressure relief mechanism is used for balancing internal and external pressure difference of the tank body and is mounted on the top surface of the tank body; when the pressure of the tank body is smaller than the pressure relief threshold value of the adjustable pressure relief mechanism, the adjustable pressure relief mechanism is in a sealed state, and the interior of the tank body is not communicated with the outside atmosphere; when the pressure of the tank body is larger than the pressure relief threshold value of the adjustable pressure relief mechanism, the adjustable pressure relief mechanism is in a pressure relief state, the interior of the tank body is communicated with the outside atmosphere, redundant liquid can be timely relieved, the hidden danger of tank expansion and cracking is eliminated, and safety is improved; and the novel pressure relief mechanism can conveniently adjust the sealing performance, the pressure difference can be adjusted according to different use scenes, and use is convenient.

Description

Technical Field

[0001] The utility model relates to a fire truck tank structure with adjustable pressure relief, belonging to the technical field of fire truck tanks. Background Art

[0002] As a key component of the fire protection system, the tank of a fire truck plays a vital role in firefighting operations. During firefighting operations, the fire tank always needs to frequently inject and pump out firefighting fluid, and the tank is frequently filled and emptied. Whether it is an independent operation or a relay operation, when the tank is filled with external injection liquid, if the external injection is not cut off in time, the liquid in the tank cannot be discharged in time, and the internal pressure rises sharply, acting on the tank wall, causing the tank to swell or even crack and damage. In particular, the compact fire truck tank has a small internal volume, and the tank made of polymer material has weak rigidity. If the pressure is not released in time, it is very easy to cause risks, which will affect or even terminate the firefighting operation. Therefore, designing a tank mechanism that can timely and effectively release pressure and liquid is an important guarantee for the normal firefighting operation of the fire truck.

[0003] In the existing design, the fire truck tank is generally Figure 1 and Figure 2 The structural form shown.

[0004] Figure 1 It is composed of a tank body 100, an external injection pipe 200, and a breathing valve 300. This arrangement is generally suitable for fire-fighting liquid that is not connected to the atmosphere. When there is a pressure difference between the inside and the outside, the breathing valve is used to balance the pressure difference between the inside and the outside. However, this method is limited to smooth injection. When the tank is full of liquid, if the external injection is not cut off in time, the pressure in the tank will rise rapidly, and there is a great risk of damaging the tank. To avoid this risk, the operator often needs to climb to the top of the tank to inject liquid directly to observe whether the liquid level has reached the limit, which is inconvenient to operate.

[0005] Figure 2 It is composed of a tank body 100, an external liquid injection pipe 200, and an overflow port 400. This arrangement generally does not require timely cutting off of the external liquid injection, so that the excess liquid can be discharged through the overflow port to reduce the pressure in the tank, which is safer. However, in this way, the liquid in the tank is directly connected to the outside atmosphere through the overflow port. When non-aqueous fire-fighting liquid (such as A and B type foam liquid) is stored in the tank, the fire-fighting liquid in the tank is very likely to be oxidized, deteriorated, volatilized, and crystallized, and then become ineffective, reducing the fire-fighting performance. In addition, when the vehicle is bumpy during driving and doing a rollover angle test, the liquid directly flows out of the overflow port, which also causes a certain amount of waste.

[0006] The existing technologies currently have the following deficiencies:

[0007] 1. The tank body, the external liquid injection pipe, and the breathing valve are combined and arranged. This kind of arrangement is only used for gentle liquid injection. When the tank body is full of liquid, if the external injection is not cut off in time, the liquid cannot be discharged, and the pressure in the tank will rise rapidly, posing a great risk of damaging the tank body. To avoid this risk, the operator often needs to climb to the top of the tank to directly inject liquid to observe whether the liquid level reaches the limit, which is inconvenient to operate.

[0008] 2. The tank body, the external liquid injection pipe, and the overflow port are combined and arranged. Although this kind of arrangement does not require timely cutting off of the external liquid injection and is relatively safe. However, in this way, the liquid in the tank is directly connected to the outside atmosphere through the overflow port. When storing non-water fire extinguishing liquid (such as Class A and Class B foam liquid) in the tank, the fire extinguishing liquid is extremely prone to oxidation, deterioration, volatilization, crystallization and then failure, reducing the fire extinguishing performance. And during driving bumps and tilting angle tests, the liquid directly flows out from the overflow port, which also causes certain waste and pollution to the test bench.

[0009] 3. The fire truck tank body with a compact layout has a small volume and weak buffering ability, and is extremely prone to sudden filling and emptying; when the fire truck is coupled and relayed for operation, the external liquid injection needs to work continuously and cannot be cut off in time; and when the tank body material uses a new type of non-metallic polymer material, the stiffness of the tank body is slightly weak, and the tank body cannot effectively buffer the impact of the external liquid injection. If the pressure is not relieved in time in these situations, risks are more likely to occur, which will affect and even abort the fire extinguishing operation, and the above-mentioned disadvantages are even more prominent. Summary of the Invention

[0010] In view of the deficiencies of the prior art, the present utility model provides a fire truck tank body structure with adjustable pressure relief, aiming to optimize the fire truck tank body structure and improve the fire safety performance through structural improvement design.

[0011] The present utility model is implemented according to the following technical solutions:

[0012] In a first aspect, the present utility model provides a fire truck tank body structure with adjustable pressure relief, including:

[0013] A tank body for storing fire extinguishing liquid;

[0014] At least one external liquid injection pipe with a switching valve, installed on the bottom surface of the tank body and communicating with the tank body;

[0015] At least one adjustable pressure relief mechanism for balancing the pressure difference inside and outside the tank body, installed on the top surface of the tank body; when the pressure in the tank body is less than the pressure relief threshold of the adjustable pressure relief mechanism, the adjustable pressure relief mechanism is in a sealed state, and the inside of the tank body is not connected to the outside atmosphere; when the pressure in the tank body is greater than the pressure relief threshold of the adjustable pressure relief mechanism, the adjustable pressure relief mechanism is in a pressure relief state, and the inside of the tank body is connected to the outside atmosphere.

[0016] In some embodiments, the adjustable pressure relief mechanism includes:

[0017] An installation part, fixed on the top surface of the tank body, having at least one inlet and at least one outlet;

[0018] A pressing part, arranged at the outlet of the installation part, for opening or sealing the outlet;

[0019] A pressure relief threshold adjustable part, acting between the installation part and the pressing part; when the pressure in the tank body is less than the pressure relief threshold, the pressure relief threshold adjustable part tightens the pressing part against the outlet; when the pressure in the tank body is greater than the pressure relief threshold, the pressure relief threshold adjustable part pushes the pressing part away from the outlet.

[0020] In some embodiments, the installation part includes:

[0021] A drain pipe, the axial center line of which is welded to the top surface of the tank body in a manner perpendicular to the top surface of the tank body, the drain pipe is communicated with the inside of the tank body, and the axial port of the drain pipe located inside the tank body serves as the inlet of the installation part;

[0022] A hole cover, installed at the axial port of the drain pipe located outside the tank body, the hole cover is provided with a central installation hole for cooperating with the pressure relief threshold adjustable part and a plurality of pressure relief ports opened around the central installation hole, and the plurality of pressure relief ports serve as the outlet of the installation part.

[0023] In some embodiments, the inner ring side wall of the hole cover is provided with internal threads, and the outer side wall of the axial port of the drain pipe located outside the tank body is provided with external threads; rotating the hole cover circumferentially on the drain pipe, the circumferential rotation of the hole cover is converted into the axial linear motion of the hole cover through the cooperation of the internal and external threads, so that the hole cover is fixed together with the drain pipe.

[0024] In some embodiments, the pressing part is a movable plate, the area of which is not less than the area of the outlet on the installation part, so that the movable plate can completely cover the outlet; the movable plate is provided with a central installation hole for cooperating with the pressure relief threshold adjustable part.

[0025] In some embodiments, the movable plate is provided with a sealing gasket on the side facing the installation part, and the outer contour of the sealing gasket is the same as that of the movable plate, and the sealing gasket is also provided with a central installation hole for cooperating with the pressure relief threshold adjustable part.

[0026] In some embodiments, the pressure relief threshold adjustable part includes:

[0027] A sliding rod, passing through the central installation holes of the pressing part and the installation part, the sliding rod is provided with a flange structure at one end close to the pressing part, the diameter of the flange structure is greater than the diameter of the central installation hole of the pressing part, and the sliding rod is provided with external threads at one end close to the installation part;

[0028] An elastic component, sleeved on a sliding rod at one end provided with an external thread;

[0029] A nut, installed at the external thread of the sliding rod, the bottom end of the elastic component is in contact with the nut, and the top end of the elastic component is in contact with the installation part. By screwing the nut into or out of the sliding rod, the compression amount of the elastic component can be steplessly adjusted, thereby changing the pressure relief threshold.

[0030] In some embodiments, the elastic component is a spring. When the nut is gradually screwed out of the sliding rod and the compression amount of the spring is adjusted to 0, it is used to apply to the working condition where there is no pressure difference inside and outside the tank. When the nut is gradually screwed into the sliding rod and the compression amount of the spring is adjusted to the maximum, it is used to apply to the working condition where the pressure difference inside and outside the tank is the largest.

[0031] In some embodiments, the pressure relief direction is adjusted by swapping the internal and external positions of the pressing part and the hole cover in the installation part and the reverse installation of the pressure relief threshold adjustable part.

[0032] In a second aspect, the present invention provides a fire truck, including the above-mentioned fire truck tank structure with adjustable pressure relief.

[0033] Advantages of the present invention:

[0034] The present invention designs a new type of pressure relief mechanism applied to the fire truck tank. When the tank is filled with liquid, it can timely discharge the excess liquid, eliminate the hidden dangers of tank swelling and cracking, and improve safety; and the new type of pressure relief mechanism can conveniently adjust the sealing performance, make the pressure difference adjustable according to different use scenarios, and is easy to use. Description of the Drawings

[0035] The drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the drawings described below are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0036] In the drawings:

[0037] Figure 1 Schematic diagram of a foam liquid tank of the prior art;

[0038] Figure 2 Schematic diagram of a water tank of the prior art;

[0039] Reference numerals in the drawings: 100 - tank body; 200 - external liquid injection pipe; 300 - breather valve; 400 - overflow port.

[0040] Figure 3Schematic diagram of the fire truck tank structure with adjustable pressure relief of the present utility model;

[0041] Figure 4 Cross-sectional view of the fire truck tank structure with adjustable pressure relief of the present utility model (sealed state);

[0042] Figure 5 Cross-sectional view of the fire truck tank structure with adjustable pressure relief of the present utility model (pressure relief state);

[0043] Figure 6 Half-sectional axonometric view of the adjustable pressure relief mechanism of the present utility model;

[0044] Figure 7 Schematic diagram of the hole cover of the present utility model;

[0045] Figure 8 Schematic diagram of the movable plate and the gasket of the present utility model (a is the movable plate, b is the gasket);

[0046] Figure 9 Schematic diagram of the adjustable pressure relief threshold part of the present utility model (a is the spring, b is the sliding rod, c is the nut);

[0047] Figure 10 Schematic diagram of the drain pipe of the present utility model;

[0048] Figure 11 Half-sectional axonometric view of another embodiment of the adjustable pressure relief mechanism of the present utility model.

[0049] Reference signs in the drawings: 1, hole cover; 2, movable plate; 3, gasket; 4, spring; 5, sliding rod; 6, nut; 7, drain pipe; 100 - tank body, 200 - external liquid injection pipe, 500 - adjustable pressure relief mechanism.

[0050] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0052] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0053] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0054] As Figure 3 , Figure 4 , Figure 5 shown, the present utility model provides a fire truck tank structure with adjustable pressure relief, which includes a tank body 100, at least one external liquid injection pipe 200 with a switch valve, and at least one adjustable pressure relief mechanism 500; the tank body 100 is used for storing fire extinguishing liquid; at least one external liquid injection pipe 200 with a switch valve is installed on the bottom surface of the tank body 100 and is in communication with the tank body 100; at least one adjustable pressure relief mechanism 500 is used to balance the pressure difference inside and outside the tank body 100, and it is installed on the top surface of the tank body 100; when the pressure in the tank body 100 is less than the pressure relief threshold of the adjustable pressure relief mechanism 500, the adjustable pressure relief mechanism 500 is in a sealed state, and the inside of the tank body 100 is not in communication with the outside atmosphere; when the pressure in the tank body 100 is greater than the pressure relief threshold of the adjustable pressure relief mechanism 500, the adjustable pressure relief mechanism 500 is in a pressure relief state, and the inside of the tank body 100 is in communication with the outside atmosphere.

[0055] As can be seen from the above, the adjustable pressure relief mechanism provided by the present utility model cooperates with the external liquid injection pipe, so that the pressure relief flow passage diameter of the adjustable pressure relief mechanism is greater than or equal to the pipe diameter of the external liquid injection pipe. It can relieve both air pressure and water pressure. When the tank is filled with liquid, it can be discharged from the adjustable pressure relief mechanism in a timely manner, quickly, safely and effectively.

[0056] The following further describes the above adjustable pressure relief mechanism.

[0057] As Figure 6As shown in the figure, the adjustable pressure relief mechanism 500 includes a mounting part, a pressing part, and a pressure relief threshold adjustable part; the mounting part is fixed on the top surface of the tank body 100, and it has at least one inlet and at least one outlet; the pressing part is arranged at the outlet of the mounting part and is used to open or seal the outlet; the pressure relief threshold adjustable part acts between the mounting part and the pressing part; when the pressure in the tank body 100 is less than the pressure relief threshold, the pressure relief threshold adjustable part tightens the pressing part to closely adhere to the outlet; when the pressure in the tank body 100 is greater than the pressure relief threshold, the pressure relief threshold adjustable part pushes the pressing part away from the outlet.

[0058] As Figure 6 , Figure 7 , Figure 10 As shown in the figure, the mounting part includes a drain pipe 7 and a hole cover 1; the axial center line of the drain pipe 7 is welded to the top surface of the tank body 100 in a manner perpendicular to the top surface of the tank body 100, the drain pipe 7 is communicated with the inside of the tank body 100, and the axial port of the drain pipe 7 located inside the tank body 100 is used as the inlet of the mounting part; the hole cover 1 is installed at the axial port of the drain pipe 7 located outside the tank body 100, and the hole cover 1 is provided with a central mounting hole for cooperating with the pressure relief threshold adjustable part and a plurality of pressure relief ports opened around the central mounting hole, and the plurality of pressure relief ports are used as the outlets of the mounting part.

[0059] Further, as Figure 6 shown in the figure, the inner ring side wall of the hole cover 1 is provided with internal threads, and the outer side wall of the axial port of the drain pipe 7 located outside the tank body 100 is provided with external threads; rotate the hole cover 1 circumferentially on the drain pipe 7, and convert the circumferential rotation of the hole cover 1 into the axial linear motion of the hole cover 1 through the cooperation of the internal and external threads, so that the hole cover 1 is fixed together with the drain pipe 7.

[0060] Preferably, as Figure 7 shown in the figure, a plurality of bumps are uniformly and alternately fixed along the entire circumference on the outer ring side wall of the hole cover 1, and the hole cover 1 is facilitated to be rotated through the plurality of bumps.

[0061] As Figure 8 shown in the figure, the pressing part is a movable plate 2, and its area is not less than the area of the outlet on the hole cover 1, so that the movable plate 2 can completely cover the outlet; the movable plate 2 is provided with a central mounting hole for cooperating with the pressure relief threshold adjustable part.

[0062] Further, continue to refer to Figure 8 shown in the figure, the movable plate 2 is provided with a sealing gasket 3 on the side facing the hole cover 1, and the outer contour of the sealing gasket 3 is the same as that of the movable plate 2, and the sealing gasket 3 is also provided with a central mounting hole for cooperating with the pressure relief threshold adjustable part. Due to the adoption of the sealing gasket 3, it is possible to prevent external air from continuously entering during the storage of the fire extinguishing liquid to avoid oxidation, deterioration, volatilization, crystallization, and failure.

[0063] As Figure 9As shown in the figure, the pressure relief threshold adjustable part includes a slide bar 5, an elastic component, and a nut 6; the slide bar 5 passes through the central mounting holes of the movable plate 2, the sealing gasket 3, and the hole cover 1. The slide bar 5 is provided with a flange structure at one end close to the movable plate 2, and the diameter of the flange structure is greater than the diameter of the central mounting hole of the movable plate 2. The slide bar 5 is provided with an external thread at one end close to the hole cover 1; the elastic component is sleeved on the slide bar 5 at the end with the external thread; the nut 6 is installed at the external thread of the slide bar 5. The bottom end of the elastic component is in contact with the nut 6, and the top end of the elastic component is in contact with the hole cover 1. By screwing the nut 6 into or out of the slide bar 5, the compression amount of the elastic component can be adjusted steplessly, thereby changing the pressure relief threshold.

[0064] For a further solution, continue to refer to Figure 9 As shown in the figure, the elastic component is a spring 4. By adjusting the nut 6 on the spring 4, the compression amount of the spring 4 can be controlled, and the compression amount can be adjusted steplessly from 0 to max. When the nut 6 is gradually screwed out on the slide bar 5 until the compression amount of the spring 4 is adjusted to 0, the best passability can be achieved, which is used for the working condition where there is no pressure difference between the inside and outside of the tank. When the nut 6 is gradually screwed into the slide bar 5 until the compression amount of the spring 4 is adjusted to the maximum, the best sealing performance can be achieved, which is used for the working condition where the pressure difference between the inside and outside of the tank is the largest. Any intermediate value can be achieved by adjusting the nut 6, and the pressure relief working condition is adjustable, which is convenient to use.

[0065] As can be seen from the above, by using the compression spring 4 and the sealing gasket 3, the continuous entry of external air can be isolated during the storage of the fire-fighting liquid to avoid oxidation, deterioration, volatilization, crystallization, and failure. When the fire-fighting system works, the spring is pushed to balance the internal and external pressure differences. It meets the requirements of draining water when the tank is full and balancing the air pressure when the tank is not full.

[0066] For a further solution, as Figure 11 shown in the figure, the pressure relief direction can be adjusted by swapping the internal and external positions of the movable plate 2 and the hole cover 1 and installing the pressure relief threshold adjustable part in the reverse direction, and they are used in combination on the tank body.

[0067] The following gives the installation process and usage process of the above adjustable pressure relief mechanism:

[0068] A drain pipe 7 is arranged at the top of the tank body 100, and the hole cover 1 is connected thereto. A movable plate 2 is arranged above the hole cover 1, and a sealing gasket 3 is arranged between the hole cover 1 and the movable plate 2. The slide bar 5 passes through the hole cover 1 and is connected to the movable plate 2 and can slide relative to the hole cover 1. A spring 4 is arranged below the slide bar 5, and a nut 6 is arranged below the spring 4 (see Figure 3 shown in the figure). The whole mechanism is simple and flexible.

[0069] When the tank body 100 is filled with liquid, the liquid can enter the hole cover 1 through the drain pipe 7 and push the movable plate 2, so that the spring 4 is compressed. After the movable plate 2 is pushed open, the liquid drains out through the passage between the hole cover 1 and the movable plate 2, quickly reducing the pressure in the tank (see Figure 5 shown in the figure).

[0070] The nut 6 on the sliding rod 5 is adjustable, so that the compression amount of the spring 4 can be adjusted according to the actual working conditions and is controllable. The compression amount can be adjusted steplessly from 0 to max. When the compression amount of the spring 4 is adjusted to 0, the best passability can be achieved (see Figure 5 as shown); when the compression amount of the spring 4 is adjusted to the maximum, the best sealing performance can be achieved (see Figure 4 as shown). Application scenarios include that when injecting liquid, the best passability is required to ensure unobstructed internal exhaust and drainage without air blockage; when conducting the vehicle rollover angle test, the best sealing performance is required to ensure no leakage of the full-load liquid. Any intermediate value can be achieved by adjusting the lock nut, and the pressure relief condition is adjustable, which is convenient to use.

[0071] The positions of the flap 2 and the hole cover 1 can be reversed to adjust the pressure relief direction (see Figure 11 as shown), and they can be used in combination on the tank body.

[0072] In summary, the present utility model realizes the following functions:

[0073] 1. The adjustable pressure relief mechanism provided by the present utility model cooperates with the external liquid injection pipe, so that the pressure relief flow passage diameter of the adjustable pressure relief mechanism is greater than or equal to the pipe diameter of the external liquid injection pipe. It can relieve both air pressure and water pressure. When the tank is filled with liquid, it can be discharged from the adjustable pressure relief mechanism in a timely, rapid, safe and effective manner.

[0074] 2. Since the present utility model can safely discharge liquid, the operator does not need to climb to the top of the tank and can directly inject from the outside of the vehicle body, which is convenient for operation.

[0075] 3. The present utility model can be used not only for foam liquid tanks but also for water tanks, and can be applied to both metal tank bodies and polymer material tank bodies. It can also be arranged on small-capacity tanks where manhole covers cannot be placed to act as a viewing cover for liquid discharge and pressure relief, with a wide range of applications.

[0076] 4. The present utility model uses a compression spring and a sealing gasket to isolate the continuous entry of external air when storing fire-fighting liquid to avoid oxidation, deterioration, volatilization, crystallization and failure. When the fire-fighting system works, it pushes the spring to balance the internal and external pressure differences. It meets the requirements of discharging water when the tank is full and balancing the air pressure when the tank is not full.

[0077] 5. Further, the spring and the sliding rod of the present utility model are adjustable. By adjusting the nut on the spring, the compression amount of the spring can be controlled, and the compression amount can be adjusted steplessly from 0 to max. For example, when the compression amount of the spring is adjusted to 0, the best passability can be achieved, and there is no pressure difference between the inside and outside of the tank; when the compression amount of the spring is adjusted to the maximum, the best sealing performance can be achieved, and the maximum pressure difference between the inside and outside of the tank. Application scenarios include that when injecting liquid, the best passability is required to ensure unobstructed internal exhaust and drainage without air blockage; when conducting the vehicle rollover angle test, the best sealing performance is required to ensure no leakage of the full-load liquid. Any intermediate value can be achieved by adjusting the nut, and the pressure relief condition is adjustable, which is convenient to use.

[0078] 6. Further, the present utility model adjusts the pressure relief and exhaust direction through forward installation and reverse installation, and the combined use effect is better.

[0079] The fire truck provided by the present utility model will be described below. The fire truck described below can be correspondingly referred to the adjustable pressure relief fire truck tank structure described above.

[0080] A fire truck provided by the present utility model may include the adjustable pressure relief fire truck tank structure described in any one of the above embodiments.

[0081] The beneficial effects achieved by the fire truck provided by the present utility model are consistent with those achieved by the adjustable pressure relief fire truck tank structure provided by the present utility model, and thus will not be elaborated here.

[0082] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0083] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present utility model and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0084] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the technical solution scope of the present utility model, can make some changes or modifications using the technical content prompted above into equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A fire truck tank structure with adjustable pressure relief, characterized in that: include: Tanks, used to store fire extinguishing liquid; At least one external liquid injection pipe with a switch valve, installed on the bottom surface of the tank body and connected to the tank body; At least one adjustable pressure relief mechanism is used to balance the pressure difference between the inside and outside of the tank body, and is installed on the top surface of the tank body; when the pressure of the tank body is less than the pressure relief threshold of the adjustable pressure relief mechanism, the adjustable pressure relief mechanism is in a sealed state, and the interior of the tank body is not connected to the outside atmosphere; when the pressure of the tank body is greater than the pressure relief threshold of the adjustable pressure relief mechanism, the adjustable pressure relief mechanism is in a pressure relief state, and the interior of the tank body is connected to the outside atmosphere.

2. The fire truck tank structure with adjustable pressure relief according to claim 1, characterized in that: The adjustable pressure relief mechanism comprises: A mounting portion, fixed to the top surface of the tank body, having at least one inlet and at least one outlet; A pressing portion, arranged at the outlet of the mounting portion, for opening or sealing the outlet; The adjustable pressure relief threshold portion acts between the mounting portion and the pressing portion; when the pressure of the tank body is less than the pressure relief threshold, the adjustable pressure relief threshold portion pulls the pressing portion close to the outlet; when the pressure of the tank body is greater than the pressure relief threshold, the adjustable pressure relief threshold portion pushes the pressing portion to separate from the outlet.

3. The fire truck tank structure with adjustable pressure relief according to claim 2, characterized in that: The installation part comprises: A drain pipe, the axial center line of which is welded on the top surface of the tank body in a manner perpendicular to the top surface of the tank body, the drain pipe is connected to the inside of the tank body, and the axial port of the drain pipe located inside the tank body is used as the inlet of the mounting portion; A hole cover is installed at the axial port of the discharge pipe outside the tank body. The hole cover is provided with a central mounting hole for use with the adjustable pressure relief threshold portion and a plurality of pressure relief ports opened around the central mounting hole. The plurality of pressure relief ports are used as outlets of the mounting portion.

4. The fire truck tank structure with adjustable pressure relief according to claim 3 is characterized in that: An internal thread is provided on the inner ring side wall of the hole cover, and an external thread is provided on the outer side wall of the axial port of the drainage pipe located outside the tank body; the hole cover is rotated circumferentially on the drainage pipe, and the circumferential rotation of the hole cover is converted into axial linear motion of the hole cover through the cooperation of the internal and external threads, thereby fixing the hole cover and the drainage pipe together.

5. The fire truck tank structure with adjustable pressure relief according to claim 2, characterized in that: The pressing part is a flap, the area of ​​which is not less than the area of ​​the outlet on the mounting part, so that the flap can completely cover the outlet; The flap is provided with a central mounting hole for use with the adjustable pressure relief threshold portion.

6. The fire truck tank structure with adjustable pressure relief according to claim 5, characterized in that: The flap is provided with a sealing gasket having the same outer contour as the flap on a side facing the mounting portion, and the sealing gasket is also provided with a central mounting hole for use in conjunction with the pressure relief threshold adjustable portion.

7. The fire truck tank structure with adjustable pressure relief according to claim 2, characterized in that: The pressure relief threshold adjustable part comprises: A slide rod is inserted into the central mounting holes of the clamping portion and the mounting portion, a flange structure is provided at one end of the slide rod close to the clamping portion, the diameter of the flange structure is larger than the diameter of the central mounting hole of the clamping portion, and an external thread is provided at one end of the slide rod close to the mounting portion; An elastic component is sleeved on a sliding rod having one end provided with an external thread; The nut is installed at the external thread of the sliding rod, the bottom end of the elastic component contacts the nut, and the top end of the elastic component contacts the mounting portion. The compression amount of the elastic component is steplessly adjusted by screwing the nut in or out on the sliding rod, thereby changing the pressure relief threshold.

8. The fire truck tank structure with adjustable pressure relief according to claim 7, characterized in that: The elastic component is a spring. When the nut is gradually screwed out on the slide rod and the spring compression is adjusted to 0, it is used for working conditions with no pressure difference inside and outside the tank. When the nut is gradually screwed in on the slide rod and the spring compression is adjusted to the maximum, it is used for working conditions with maximum pressure difference inside and outside the tank.

9. The fire truck tank structure with adjustable pressure relief according to claim 2, characterized in that: The pressure relief direction can be adjusted by exchanging the inner and outer positions of the pressing portion and the hole cover in the installation portion and by reversely installing the pressure relief threshold adjustable portion.

10. A fire truck, characterized in that: A fire truck tank structure with adjustable pressure relief comprising any one of claims 1 to 9.

Images