Vehicle-mounted liquid supply system and liquid supply fire truck

Abstract

The utility model discloses a vehicle-mounted liquid supply system and a liquid supply fire fighting truck, and relates to the technical field of fire fighting equipment. The vehicle-mounted liquid supply system comprises at least two foam pumps and at least two foam tanks. And each foam pump is connected with the foam tank through a liquid inlet / outlet pipe. The liquid inlet and outlet pipe is provided with a liquid suction port and a liquid outlet. The liquid inlet and outlet pipe is used for discharging foam liquid in the foam tank through the liquid outlet or absorbing the foam liquid through the liquid absorbing opening so as to convey the foam liquid to the foam tank. The liquid supply fire truck comprises the vehicle-mounted liquid supply system. The vehicle-mounted liquid supply system of the liquid supply fire truck can suck different foam liquids while spraying, realizes long-term storage of the foam liquids, avoids waste of the foam liquids, and improves the conveying efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting equipment, in particular to a vehicle-mounted liquid supply system and a liquid supply fire fighting truck. Background Art

[0002] The function of the liquid supply fire truck is to be equipped with a liquid pump and a liquid fire extinguishing agent tank, and is used to transport various types of liquid fire extinguishing agents.

[0003] The inventors have found that the existing liquid supply fire trucks have a single function and can only suck and supply the same type of foam liquid. They cannot support the function of sucking and supplying different foam liquids at the same time and the long-term storage of foam liquid, which leads to waste of foam liquid, low efficiency, and even fails to play a role in fire fighting. Utility Model Content

[0004] The utility model aims to provide a vehicle-mounted liquid supply system and a liquid supply fire truck, which can supply different foam liquids while sucking, thereby avoiding the waste of foam liquid and improving the transportation efficiency.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a vehicle-mounted liquid supply system, comprising at least two foam pumps and at least two foam tanks, each of the foam pumps being connected to the foam tank via a liquid inlet and outlet pipe, the liquid inlet and outlet pipes being provided with a liquid suction port and a liquid outlet, the liquid inlet and outlet pipes being used to discharge the foam liquid in the foam tank via the liquid outlet, or to absorb the foam liquid via the liquid suction port, so as to transport the foam liquid to the foam tank.

[0007] In an optional embodiment, the foam pump includes a front pump and a rear pump, the front pump is connected to the foam tank via a first inlet and outlet pipe, and the rear pump is connected to the foam tank via a second inlet and outlet pipe, the first inlet and outlet pipe is provided with a first liquid suction port and a first liquid outlet, and the second inlet and outlet pipe is provided with a second liquid suction port and a second liquid outlet.

[0008] In an optional embodiment, the first liquid inlet and outlet pipe comprises a first liquid inlet pipe and a first liquid outlet pipe, the two ends of the first liquid inlet pipe are respectively connected to the front pump and the foam tank, the first liquid inlet pipe is provided with the first liquid suction port, the two ends of the first liquid outlet pipe are respectively connected to the front pump and the foam tank, and the first liquid outlet pipe is provided with a first liquid outlet;

[0009] The second liquid inlet and outlet pipe includes a second liquid inlet pipe and a second liquid outlet pipe, the two ends of the second liquid inlet pipe are respectively connected to the rear pump and the foam tank, the second liquid inlet pipe is provided with the second liquid suction port, the two ends of the second liquid outlet pipe are respectively connected to the rear pump and the foam tank, and the second liquid outlet pipe is provided with the second liquid outlet.

[0010] In an optional embodiment, a first liquid inlet valve is provided between the foam tank and the first liquid inlet pipe, a second liquid inlet valve is provided between the foam tank and the second liquid inlet pipe, a first liquid injection valve is provided between the foam tank and the first liquid outlet pipe, and a second liquid injection valve is provided between the foam tank and the second liquid outlet pipe.

[0011] In an optional embodiment, a third liquid suction port is further provided on the second liquid inlet pipe.

[0012] In an optional embodiment, the first inlet and outlet liquid pipe and the second inlet and outlet liquid pipe are respectively provided with a bypass balancing safety valve.

[0013] In an optional embodiment, a metering valve is provided on the first inlet and outlet liquid pipe and the second inlet and outlet liquid pipe respectively.

[0014] In a second aspect, the utility model provides a liquid supply fire truck, comprising a vehicle-mounted liquid supply system as described in any one of the aforementioned embodiments, wherein the foam tank is located in the compartment of the liquid supply fire truck, the front pump and the first liquid outlet are located at one end of the compartment close to the front of the vehicle, and the rear pump and the second liquid outlet are located at one end of the compartment close to the rear of the vehicle.

[0015] In an optional embodiment, a liquid suction arm is provided on the top of the carriage, a liquid suction pipe is provided on the liquid suction arm, and the liquid suction pipe is connected to the first liquid suction port.

[0016] In an optional embodiment, one end of the liquid suction arm is rotatably connected to the carriage.

[0017] The beneficial effects of the embodiments of the utility model are:

[0018] The vehicle-mounted liquid supply system of the utility model includes at least two foam pumps and at least two foam tanks. Each foam pump is connected to the foam tank through an inlet and outlet pipe. The inlet and outlet pipes are provided with a liquid suction port and a liquid outlet. The inlet and outlet pipes are used to discharge the foam liquid in the foam tank through the liquid outlet, or absorb the foam liquid through the liquid suction port, so as to convey the foam liquid to the foam tank. The utility model is connected to the foam tanks by arranging different foam pumps respectively, and the foam pumps can selectively discharge the foam liquid in the foam tank or convey the foam liquid to the foam tank. The arrangement of different foam pumps and multiple foam tanks enables the liquid supply system to spray and absorb different foam liquids at the same time, realizes long-term storage of the foam liquid, avoids waste of the foam liquid, and improves the conveying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a liquid supply fire truck provided by an embodiment of the utility model;

[0021] Figure 2 A schematic structural diagram of a vehicle-mounted liquid supply system provided in an embodiment of the utility model.

[0022] Icons: 1000-liquid supply fire truck; 100-on-board liquid supply system; 10-foam tank; 20-first liquid inlet and outlet pipes; 21-first liquid inlet pipe; 211-first liquid suction port; 212-flushing port; 213-first liquid inlet valve; 22-front pump; 221-balancing safety valve; 23-first liquid outlet pipe; 231-first liquid outlet; 232-metering valve; 233-first liquid injection valve; 30-second liquid inlet and outlet pipes; 31-second liquid inlet pipe; 311-second liquid suction port; 312-third liquid suction port; 313-second liquid inlet valve; 32-rear pump; 33-second liquid outlet pipe; 331-second liquid outlet; 332-second liquid injection valve; 200-carriage; 201-liquid suction arm; 202-liquid suction pipe; 203-swivel joint; 204-telescopic hose. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Please refer to Figure 1 This embodiment provides a liquid supply fire truck 1000, which includes a compartment 200 and a vehicle-mounted liquid supply system 100 arranged in the compartment 200.

[0030] A liquid suction arm 201 is provided on the top of the carriage 200, and a liquid suction pipe 202 is provided on the liquid suction arm 201 for conveying foam liquid to the vehicle-mounted liquid supply system 100 in the carriage 200. Specifically, the length direction of the liquid suction pipe 202 is consistent with the length direction of the liquid suction arm 201.

[0031] In order to enable the liquid suction pipe 202 to absorb foam liquid in all directions, one end of the liquid suction arm 201 is rotatably connected to the carriage 200. Specifically, in this embodiment, one end of the liquid suction arm 201 is connected to the top of the carriage 200 through a swivel joint 203.

[0032] Furthermore, in order to adjust the height of the pipette arm 201 , one end of the pipette arm 201 is hinged to the swivel joint 203 so that the end of the pipette arm 201 away from the swivel joint 203 can be raised or lowered as the pipette arm 201 rotates.

[0033] It can be understood that the swivel joint 203 can rotate around the vertical axis, and one end of the pipette arm 201 can rotate around the horizontal axis, so that one end of the pipette arm 201 can move freely within a certain spatial range, thereby allowing the end position of the pipette tube 202 to be freely adjusted.

[0034] Furthermore, a telescopic hose 204 is provided at one end of the liquid suction pipe 202, so as to facilitate the suction of foam liquid from other foam liquid tanks.

[0035] Please combine Figure 1 and Figure 2 The vehicle-mounted liquid supply system 100 includes at least two foam pumps and at least two foam tanks 10. Each foam pump is connected to the foam tank 10 through an inlet and outlet pipe. The inlet and outlet pipes are provided with a liquid suction port and a liquid outlet. The inlet and outlet pipes are used to discharge the foam liquid in the foam tank 10 through the liquid outlet, or absorb the foam liquid through the liquid suction port, so as to transport the foam liquid to the foam tank 10.

[0036] It is understandable that both ends of the inlet and outlet pipes are connected to the foam tank 10, and a liquid suction port, a foam pump and a liquid outlet are provided thereon. Specifically, when the vehicle-mounted liquid supply system 100 needs to spray foam liquid, the foam liquid in the foam tank 10 is input into the inlet and outlet pipe from the first end of the inlet and outlet pipe under the action of the foam pump, and then sprayed out from the liquid outlet; when the vehicle-mounted liquid supply system 100 needs to absorb foam liquid from the outside, the foam pump sucks the external foam liquid into the inlet and outlet pipe from the liquid suction port, and then inputs it into the foam tank 10 from the second end of the inlet and outlet pipe.

[0037] Specifically, the foam pump includes a front pump 22, a rear pump 32 and at least two foam tanks 10. The front pump 22 is connected to the foam tank 10 through a first liquid inlet and outlet pipe 20. The rear pump 32 is connected to the foam tank 10 through a second liquid inlet and outlet pipe 30. The first liquid inlet and outlet pipe 20 is provided with a first liquid suction port 211 and a first liquid outlet 231. The second liquid inlet and outlet pipe 30 is provided with a second liquid suction port 311 and a second liquid outlet 331.

[0038] Optionally, in the present embodiment, the foam tank 10 is located in the compartment 200 of the liquid supply fire truck 1000, approximately in the middle of the compartment 200. The front pump 22 and the first liquid outlet 231 are located at one end of the compartment 200 close to the front of the vehicle. The rear pump 32 and the second liquid outlet 331 are located at one end of the compartment 200 close to the rear of the vehicle. In other embodiments, the front pump 22 and the rear pump 32 can be located at any position of the liquid supply fire truck 1000, as long as the front pump 22 and the rear pump 32 can work independently. Optionally, the liquid supply fire truck 1000 can also include more than two foam pumps, and the utility model does not limit the installation position of the foam pump.

[0039] Furthermore, control valves (not shown) are provided at the first liquid outlet 231 and the second liquid outlet 331 for controlling the first liquid outlet 231 and the second liquid outlet 331 to be opened or closed.

[0040] Optionally, in this embodiment, the vehicle-mounted liquid supply system 100 includes three foam tanks 10, which can store different foam liquids. In other embodiments, the vehicle-mounted liquid supply system 100 may include two, four or more foam tanks 10, which is not limited by the present invention.

[0041] In this embodiment, the first suction port 211 is connected to one end of the suction pipe 202, so that the suction pipe 202 can inject foam liquid into the foam tank 10. Further, the second suction port 311 is located at the rear of the carriage 200. It can be understood that when the foam liquid source is a foam liquid tank truck, the suction pipe 202 can be raised and enter the top of the foam liquid tank truck through the telescopic hose 204 to absorb the foam liquid; when the foam liquid source is an external foam container, the foam liquid can be directly input externally at the rear of the carriage 200.

[0042] Specifically, the first liquid inlet and outlet pipe 20 includes a first liquid inlet pipe 21 and a first liquid outlet pipe 23. The two ends of the first liquid inlet pipe 21 are connected to the front pump 22 and the foam tank 10, respectively. The first liquid inlet pipe 21 is provided with a first liquid suction port 211. The two ends of the first liquid outlet pipe 23 are connected to the front pump 22 and the foam tank 10, respectively. The first liquid outlet pipe 23 is provided with a first liquid outlet 231. The second liquid inlet and outlet pipe 30 includes a second liquid inlet pipe 31 and a second liquid outlet pipe 33. The two ends of the second liquid inlet pipe 31 are connected to the rear pump 32 and the foam tank 10, respectively. The second liquid inlet pipe 31 is provided with a second liquid suction port 311. The two ends of the second liquid outlet pipe 33 are connected to the rear pump 32 and the foam tank 10, respectively. The second liquid outlet pipe 33 is provided with a second liquid outlet 331.

[0043] It can be understood that, in this embodiment, one end of the first liquid inlet pipe 21 is divided into three branches and connected to three foam tanks 10 respectively, and the first liquid inlet pipe 21 and the first liquid outlet pipe 23 are connected through the front pump 22. The other end of the first liquid outlet pipe 23 is divided into three branches and connected to three foam tanks 10 respectively to form a loop. One end of the second liquid inlet pipe 31 is divided into three branches and connected to three foam tanks 10 respectively, and the second liquid inlet pipe 31 and the second liquid outlet pipe 33 are connected through the front pump 22. The other end of the second liquid outlet pipe 33 is divided into three branches and connected to three foam tanks 10 respectively to form a loop.

[0044] Further, a first liquid inlet valve 213 is provided between the foam tank 10 and the first liquid inlet pipe 21. A second liquid inlet valve 313 is provided between the foam tank 10 and the second liquid inlet pipe 31. A first liquid injection valve 233 is provided between the foam tank 10 and the first liquid outlet pipe 23. A second liquid injection valve 332 is provided between the foam tank 10 and the second liquid outlet pipe 33. It can be understood that the first liquid inlet valve 213, the second liquid inlet valve 313, the first liquid injection valve 233 and the second liquid injection valve 332 are respectively provided on the branch lines of the liquid inlet and outlet pipes, and can control the output and input of the foam liquid of a single foam tank 10.

[0045] Optionally, the second liquid inlet pipe 31 is further provided with a third liquid suction port 312 for simultaneously absorbing different foam liquids to enhance the conveying efficiency. In other embodiments, the number of the liquid suction ports can be set as required, and the utility model does not limit this.

[0046] In order to improve the safety of the liquid supply system, a bypass balance safety valve 221 is provided on the first inlet and outlet liquid pipe 20 and the second inlet and outlet liquid pipe 30. Specifically, in this embodiment, the balance safety valve 221 is connected in parallel with the front pump 22 and the rear pump 32 on the first inlet and outlet liquid pipe 20 and the second inlet and outlet liquid pipe 30. In other embodiments, the position of the balance safety valve 221 can be set as needed, and the utility model does not limit it.

[0047] In order to monitor the flow of the liquid supply system and ensure the safe operation of the system, metering valves 232 are respectively provided on the first inlet and outlet liquid pipes 20 and the second inlet and outlet liquid pipes 30. Specifically, in this embodiment, the metering valves 232 are respectively provided on the first outlet liquid pipe 23 and the second outlet liquid pipe 33. In other embodiments, the position of the metering valve 232 can be set as needed, and the utility model does not limit it.

[0048] When the liquid supply system is used up, in order to clean the pipes, the first inlet and outlet pipes 20 and the second inlet and outlet pipes 30 are respectively provided with flushing ports 212. Specifically, in this embodiment, the flushing ports 212 are respectively provided on the first liquid inlet pipe 21 and the second liquid inlet pipe 31. In other embodiments, the position of the flushing ports 212 can be set as needed, and the utility model does not limit this.

[0049] The working principle and process of the vehicle-mounted liquid supply system 100 of the liquid supply fire truck 1000 provided by the embodiment of the utility model are:

[0050] When foam liquid needs to be output from the first liquid outlet 231, open the first liquid inlet valve 213, close the second liquid inlet valve 313, the first liquid injection valve 233, the first liquid suction port 211 and the second liquid injection valve 332, and open the first liquid outlet 231 through the control valve. At this time, the foam liquid in the foam tank 10 passes through the first liquid inlet pipe 21, the front pump 22 and the first liquid outlet pipe 23, and then sprays out from the first liquid outlet 231.

[0051] When it is necessary to output foam liquid from the second liquid outlet 331, open the second liquid inlet valve 313, close the first liquid inlet valve 213, the first liquid injection valve 233, the second liquid suction port 311 and the second liquid injection valve 332, and open the second liquid outlet 331 through the control valve. At this time, the foam liquid in the foam tank 10 passes through the second liquid inlet pipe 31, the rear pump 32 and the second liquid outlet pipe 33, and then is sprayed out from the second liquid outlet 331.

[0052] When it is necessary to output foam liquid from the first liquid outlet 231 and the second liquid outlet 331 at the same time, open the first liquid inlet valve 213 and the second liquid inlet valve 313, close the first liquid injection valve 233, the second liquid injection valve 332, the first liquid suction port 211 and the second liquid suction port 311, and open the first liquid outlet 231 and the second liquid outlet 331 through the control valve. At this time, the foam liquid in the foam tank 10 is divided into two paths, one path passes through the first liquid inlet pipe 21, the front pump 22 and the first liquid outlet pipe 23, and is sprayed out from the first liquid outlet 231, and the other path passes through the second liquid inlet pipe 31, the rear pump 32 and the second liquid outlet pipe 33, and is sprayed out from the second liquid outlet 331.

[0053] When it is necessary to input foam liquid into the foam tank 10, the first liquid suction port 211 and the first liquid injection valve 233 can be opened, and the first liquid outlet 231, the first liquid inlet valve 213 and the second liquid inlet valve 313 can be closed. At this time, the external foam liquid enters the foam tank 10 through the first liquid inlet pipe 21, the front pump 22 and the first liquid outlet pipe 23; the second liquid suction port 311 and the second liquid injection valve 332 can be opened, and the second liquid outlet 331, the first liquid inlet valve 213 and the second liquid inlet valve 313 can be closed. At this time, the external foam liquid enters the foam tank 10 through the second liquid inlet pipe 31, the rear pump 32 and the second liquid outlet pipe 33; the first liquid suction port 211, the second liquid suction port 311, the first liquid injection valve 233 and the second liquid injection valve 332 can also be opened at the same time, and the first liquid outlet 231, the second liquid outlet 331, the first liquid inlet valve 213 and the second liquid inlet valve 313 can be closed. At this time, foam liquid from different sources can be absorbed.

[0054] It should be noted that the vehicle-mounted liquid supply system 100 of the liquid supply fire truck 1000 provided in the embodiment of the utility model can also realize that the front pump 22 sucks the foam liquid and the rear pump 32 sprays the foam liquid, or the front pump 22 sprays the foam liquid and the rear pump 32 sucks the foam liquid. That is, different foam liquids can be sucked and supplied at the same time, and there are multiple liquid discharge or liquid suction modes.

[0055] The beneficial effects of the vehicle-mounted liquid supply system 100 of the liquid supply fire truck 1000 provided by the embodiment of the utility model are:

[0056] The vehicle-mounted liquid supply system 100 of the utility model includes at least two foam pumps and at least two foam tanks 10. Each foam pump is connected to the foam tank 10 through an inlet and outlet pipe. The inlet and outlet pipes are provided with a liquid suction port and a liquid outlet. The inlet and outlet pipes are used to discharge the foam liquid in the foam tank 10 through the liquid outlet, or absorb the foam liquid through the liquid suction port, so as to deliver the foam liquid to the foam tank 10. The utility model is connected to the foam tank 10 by arranging different foam pumps, and the foam pumps can selectively discharge the foam liquid in the foam tank 10 or deliver the foam liquid to the foam tank 10. The arrangement of different foam pumps and multiple foam tanks 10 enables the liquid supply system to spray and absorb different foam liquids, realize long-term storage of the foam liquid, avoid waste of the foam liquid, and improve the delivery efficiency.

[0057] The liquid supply fire truck 1000 of the utility model can spray and absorb different foam liquids at the same time, so as to realize long-term storage of the foam liquid, avoid waste of the foam liquid, and improve the transportation efficiency.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle-mounted liquid supply system, characterized in that: The foam pump comprises at least two foam pumps and at least two foam tanks, each of the foam pumps is connected to the foam tanks through a liquid inlet and outlet pipe, the liquid inlet and outlet pipes are provided with a liquid suction port and a liquid outlet, the liquid inlet and outlet pipes are used to discharge the foam liquid in the foam tanks through the liquid outlets, or absorb the foam liquid through the liquid suction port, so as to deliver the foam liquid to the foam tanks; The foam pump comprises a front pump and a rear pump, the front pump is connected to the foam tank via a first inlet and outlet pipe, the rear pump is connected to the foam tank via a second inlet and outlet pipe, the first inlet and outlet pipe is provided with a first liquid suction port and a first liquid outlet, the second inlet and outlet pipe is provided with a second liquid suction port and a second liquid outlet; The first liquid inlet and outlet pipe comprises a first liquid inlet pipe and a first liquid outlet pipe, the two ends of the first liquid inlet pipe are respectively connected to the front pump and the foam tank, the first liquid inlet pipe is provided with the first liquid suction port, the two ends of the first liquid outlet pipe are respectively connected to the front pump and the foam tank, and the first liquid outlet pipe is provided with a first liquid outlet; The second liquid inlet and outlet pipe includes a second liquid inlet pipe and a second liquid outlet pipe, the two ends of the second liquid inlet pipe are respectively connected to the rear pump and the foam tank, the second liquid inlet pipe is provided with the second liquid suction port, the two ends of the second liquid outlet pipe are respectively connected to the rear pump and the foam tank, and the second liquid outlet pipe is provided with the second liquid outlet.

2. The vehicle-mounted liquid supply system according to claim 1, characterized in that: A first liquid inlet valve is provided between the foam tank and the first liquid inlet pipe, a second liquid inlet valve is provided between the foam tank and the second liquid inlet pipe, a first liquid injection valve is provided between the foam tank and the first liquid outlet pipe, and a second liquid injection valve is provided between the foam tank and the second liquid outlet pipe.

3. The vehicle-mounted liquid supply system according to claim 1, characterized in that: The second liquid inlet pipe is also provided with a third liquid suction port.

4. The vehicle-mounted liquid supply system according to claim 1, characterized in that: The first inlet and outlet liquid pipe and the second inlet and outlet liquid pipe are respectively provided with a bypass balancing safety valve.

5. The vehicle-mounted liquid supply system according to claim 1, characterized in that: The first inlet and outlet liquid pipe and the second inlet and outlet liquid pipe are respectively provided with metering valves.

6. A liquid supply fire truck, characterized in that: It comprises the vehicle-mounted liquid supply system as described in any one of claims 1 to 5, wherein the foam tank is located in the compartment of the liquid supply fire truck, the front pump and the first liquid outlet are located at an end of the compartment close to the front of the vehicle, and the rear pump and the second liquid outlet are located at an end of the compartment close to the rear of the vehicle.

7. The liquid supply fire truck according to claim 6, characterized in that: A liquid suction arm is provided on the top of the carriage, a liquid suction pipe is provided on the liquid suction arm, and the liquid suction pipe is connected to the first liquid suction port.

8. The liquid supply fire truck according to claim 7, characterized in that: One end of the liquid suction arm is rotatably connected to the carriage.

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