Compressed air foam system

Abstract

The utility model relates to the technical field of fire fighting, in particular to a compressed air foam system. The compressed air foam system comprises a water supply unit and a foam supply unit. The foam supply unit comprises a foam pump, a first filter and a foam source, the first filter is provided with a first port, a second port and a third port, the first port is connected with the foam source through a first pipeline, the second port is connected with a liquid inlet of the foam pump through a second pipeline, and the third port is connected with a first emptying pipeline; the water supply unit comprises a fire pump, a first cleaning branch and a second cleaning branch, the other end of the first cleaning branch is connected with the first pipeline, and the other end of the second cleaning branch is connected with the second pipeline. The compressed air foam system can perform forward and reverse bidirectional cleaning on the first filter, a worker does not need to disassemble and clean the first filter, and the compressed air foam system is easy to maintain and high in reliability.

Description

Technical Field

[0001] This application relates to the field of fire protection technology, and more particularly to a compressed air foam system. Background Technology

[0002] Compressed air foam systems are fire extinguishing systems that can be installed on fire trucks. They mix water, foam concentrate, and compressed air in pipelines to form foam, which is then sprayed out through fire monitors to extinguish fires.

[0003] Currently, compressed air foam systems are equipped with foam pumps to deliver the foam concentrate. These foam pumps are often plunger pumps, gear pumps, or other pumps with metering capabilities. These types of foam pumps are generally quite precise, requiring a filter upstream of the pump with high filtration accuracy.

[0004] However, to avoid clogging of the filter screen, the filter needs to be disassembled and cleaned manually on a regular basis. The automation level is low, and when the filter screen is manually disassembled and cleaned, impurities are easily introduced into the downstream pipeline of the filter, causing the foam pump to jam. Utility Model Content

[0005] Based on this, this application provides a compressed air foam system to solve the problem that filters in related technologies need to be manually disassembled and cleaned periodically.

[0006] This application provides a compressed air foam system, including a water supply unit and a foam supply unit;

[0007] The foam supply unit includes a foam pump, a first filter, and a foam source. The first filter has a first port, a second port, and a third port. The first port is connected to the foam source through a first pipeline, the second port is connected to the inlet of the foam pump through a second pipeline, and the third port is connected to a first venting pipeline.

[0008] The water supply unit includes a fire pump, a first cleaning branch and a second cleaning branch. One end of the first cleaning branch and one end of the second cleaning branch are respectively connected to the outlet of the fire pump. The other end of the first cleaning branch is connected to the first pipeline, and the other end of the second cleaning branch is connected to the second pipeline.

[0009] In one possible implementation, the compressed air foam system also includes a diversion pump, the inlet of which is connected to a second pipeline or a downstream pipeline of the foam pump.

[0010] In one possible implementation, the water supply unit also includes a water tank, which is connected to the inlet of the fire pump via a first water supply pipeline;

[0011] The compressed air foam system also includes a first drainage branch and a second drainage branch. One end of the first drainage branch and one end of the second drainage branch are respectively connected to the inlet of the drainage pump. The other end of the first drainage branch is connected to the first water supply pipeline, and the other end of the second drainage branch is connected to the downstream pipeline of the foam pump.

[0012] In one possible implementation, a first switching valve is provided on the first drainage branch and a second switching valve is provided on the second drainage branch.

[0013] In one possible implementation, a flow meter is installed on the downstream pipeline of the foam pump; and / or,

[0014] The foam source includes a first foam supply device and a second foam supply device. An external suction port is provided on the first pipeline. The end of the first pipeline away from the first filter is connected to the first foam supply device. The external suction port is used to connect to the second foam supply device.

[0015] In one possible implementation, the water supply unit also includes a second filter installed on the second cleaning branch.

[0016] In one possible implementation, the compressed air foam system further includes a first control valve, a second control valve, a drain valve, and a controller. The first control valve is installed on a first cleaning branch, the second control valve is installed on a second cleaning branch, and the drain valve is installed on a first venting pipeline. The first control valve, the second control valve, and the drain valve are electrically connected to the controller.

[0017] In one possible implementation, the compressed air foam system also includes a second venting line, which is connected to the outlet of the fire pump and the downstream line of the foam pump.

[0018] In one possible implementation, the water supply unit also includes a return pipeline, one end of which is connected to the outlet of the fire pump, and the other end of which is connected to the water tank. A third switch valve is installed on the return pipeline.

[0019] In one possible implementation, the compressed air foam system further includes a fire monitor, a second water supply line, and a mixing line. One end of the mixing line is connected to the downstream line of the foam pump and the outlet of the fire pump, respectively, and the other end of the mixing line is connected to the fire monitor. One end of the second water supply line is connected to the fire pump, and the other end of the second water supply line is connected to the fire monitor.

[0020] The compressed air foam system provided in this application has a first filter in its foam supply unit with a first port, a second port, and a third port. The first port is connected to the foam source via a first pipeline, the second port is connected to the inlet of the foam pump via a second pipeline, and the third port is connected to a first venting pipeline. The water supply unit of the compressed air foam system includes a fire pump, a first cleaning branch, and a second cleaning branch. The end of the first cleaning branch furthest from the fire pump is connected to the first pipeline, and the end of the second cleaning branch furthest from the fire pump is connected to the second pipeline. After the compressed air foam system completes fire extinguishing operations, personnel can first control the cleaning water from the fire pump to flow sequentially through the first cleaning branch, the first pipeline, the first filter, and the foam pump, cleaning the foam pump while simultaneously performing forward cleaning of the first filter. After forward cleaning, personnel can control the cleaning water from the fire pump to flow sequentially through the second cleaning branch, the second pipeline, the first filter, and the first venting pipeline to perform reverse cleaning of the first filter. During reverse cleaning, the cleaning water flows from the inside to the outside of the filter screen, effectively removing impurities adhering to the outer wall of the filter screen. The system eliminates the need for staff to disassemble and clean the first filter, increasing the automation level of the compressed air foam system. The compressed air foam system is easy to maintain and highly reliable. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the compressed air foam system provided in an embodiment of this application;

[0023] Figure 2 A schematic diagram of forward cleaning provided for embodiments of this application. Figure 1 ;

[0024] Figure 3 A schematic diagram of forward cleaning provided for embodiments of this application. Figure 2 ;

[0025] Figure 4 A reverse cleaning illustration provided for an embodiment of this application Figure 1 ;

[0026] Figure 5 A reverse cleaning illustration provided for an embodiment of this application Figure 2 ;

[0027] Figure 6A schematic diagram of the first type of foam-initiating liquid for a compressed air foam system provided in this application embodiment;

[0028] Figure 7 This is a schematic diagram of a second type of foam-inducing raw material for a compressed air foam system provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 - Water supply unit; 110 - Fire pump; 120 - First cleaning branch; 121 - First control valve; 130 - Second cleaning branch; 131 - Second control valve; 140 - Second filter; 150 - Water tank; 151 - Water inlet; 152 - Drain outlet; 160 - First water supply line; 161 - Tank outlet valve; 162 - Suction port; 170 - Return line; 171 - Third switch valve;

[0031] 200-Foam supply unit; 210-Foam pump; 220-First filter; 231-First foam supply device; 241-First pipeline; 2411-External suction port; 2412-Foam valve; 242-Second pipeline; 243-First drain pipeline; 2431-Drain valve;

[0032] 300 - Second drain line;

[0033] 400 - Drainage pump; 410 - First drainage branch; 411 - First switching valve; 420 - Second drainage branch; 421 - Second switching valve;

[0034] 500-fire monitor;

[0035] 600 - Second water supply pipeline;

[0036] 700 - Mixing line; 710 - Proportional valve;

[0037] 810 - Air compressor; 820 - Check valve. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] The terms “first,” “second,” and “third” (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0042] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0043] In existing technologies, compressed air foam systems are equipped with foam pumps to deliver foam concentrate. These pumps are often metering pumps, such as plunger pumps or gear pumps. These foam pumps are generally quite precise, requiring a filter upstream with high filtration accuracy. However, to prevent filter screen clogging, the filter needs to be manually disassembled and cleaned periodically, resulting in low automation. Furthermore, manual filter cleaning can easily introduce impurities into downstream pipelines, causing the foam pump to jam. Some compressed air foam systems have cleaning pipelines. After firefighting operations, a fire pump can drive cleaning water through these pipelines, sequentially passing through the filter and foam pump to clean them. However, this only cleans the filter in one direction. Without disassembling the filter, cleaning in one direction is insufficient to thoroughly remove impurities adhering to the filter screen surface.

[0044] After repeated consideration and verification, the inventors discovered that if the compressed air foam system is equipped with two cleaning pipelines—one connected to the upstream pipeline of the filter and the other to the downstream pipeline—the fire pump can drive cleaning water through both pipelines to perform bidirectional cleaning of the filter. The cleaning water enters the filter from the upstream and performs forward cleaning before flowing into the foam pump to clean it. By installing a drain port on the filter and connecting it to a drain pipeline, the cleaning water enters the filter from the downstream and flows out through the drain pipeline, achieving reverse cleaning of the filter. This bidirectional cleaning effectively removes impurities adhering to the filter screen surface, eliminating the need for manual filter disassembly and improving the automation level of the compressed air foam system.

[0045] In view of this, the inventors designed a compressed air foam system. The filter of its foam supply unit has a first port, a second port, and a third port. The first port is connected to a foam source via a first pipe, the second port is connected to a foam pump via a second pipe, and the third port is connected to a drain pipe. A first cleaning branch and a second cleaning branch are provided in the water supply unit, with the first cleaning branch connected to the first pipe and the second cleaning branch connected to the second pipe. The fire pump of the water supply unit can drive cleaning water through the first cleaning branch into the filter and the foam pump for forward cleaning, and the fire pump can drive cleaning water through the second cleaning branch into the filter and discharge it from the drain pipe for reverse cleaning. Personnel do not need to disassemble and clean the filter.

[0046] The technical solution of the compressed air foam system provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0047] Reference Figures 1-5 As shown in the embodiment of this application, the compressed air foam system includes a water supply unit 100 and a foam supply unit 200. The foam supply unit 200 includes a foam pump 210, a first filter 220, and a foam source. The first filter 220 has a first port, a second port, and a third port. The first port is connected to the foam source through a first pipe 241, the second port is connected to the inlet of the foam pump 210 through a second pipe 242, and the third port is connected to a first vent pipe 243.

[0048] Schematic, the first filter 220 includes a housing and a filter screen located within the housing. The filter screen can be formed into a cylindrical structure, dividing the interior of the housing into a first chamber and a second chamber. The first chamber is located outside the filter screen, and the second chamber is located inside the filter screen. A first port and a third port are respectively connected to the first chamber, and a second port is connected to the second chamber. During firefighting operations, the foam concentrate in the compressed air foam system flows sequentially through the first pipeline 241, the first filter 220, the second pipeline 242, and the foam pump 210 under the drive of the foam pump 210. Impurities in the foam concentrate are filtered out by the first filter 220, preventing them from entering the foam pump 210.

[0049] The water supply unit 100 includes a fire pump 110, a first cleaning branch 120 and a second cleaning branch 130. One end of the first cleaning branch 120 and one end of the second cleaning branch 130 are respectively connected to the outlet of the fire pump 110. The other end of the first cleaning branch 120 is connected to the first pipeline 241 and the other end of the second cleaning branch 130 is connected to the second pipeline 242.

[0050] The fire pump 110's inlet can be connected to a water source via a pipeline, allowing it to draw water (cleaning water) into either the first cleaning branch 120 or the second cleaning branch 130. A check valve 820 can be installed downstream of the fire pump 110 to prevent backflow of water. After the fire pump 110 draws the cleaning water through the first cleaning branch 120 into the first pipeline 241, the cleaning water can enter the first filter 220 from the first port and exit from the first filter 220 from the second port. After exiting the first filter 220, the cleaning water can enter the foam pump 210 and clean it. This process achieves both the cleaning of the fire pump 110 and the forward cleaning of the first filter 220. Fire pump 110 drives cleaning water through the second cleaning branch 130 into the second pipeline 242. The cleaning water can then enter the first filter 220 from the second port and exit from the first filter 220 from the third port. After exiting the first filter 220 from the third port, the cleaning water can be discharged through the first drain pipeline 243. This process achieves reverse cleaning of the first filter 220. Reverse cleaning effectively removes impurities adhering to the outer wall of the filter screen.

[0051] The compressed air foam system provided in this embodiment has a foam supply unit 200 with a first filter 220 having a first port, a second port, and a third port. The first port is connected to the foam source via a first pipe 241, the second port is connected to the inlet of the foam pump 210 via a second pipe 242, and the third port is connected to a first vent pipe 243. The water supply unit 100 of the compressed air foam system includes a fire pump 110, a first cleaning branch 120, and a second cleaning branch 130. The end of the first cleaning branch 120 away from the fire pump 110 is connected to the first pipe 241, and the end of the second cleaning branch 130 away from the fire pump 110 is connected to the second pipe 242. After the compressed air foam system completes the fire extinguishing operation, the operator can control the cleaning water from the fire pump 110 to flow sequentially through the first cleaning branch 120, the first pipe 241, the first filter 220, and the foam pump 210, cleaning the foam pump 210 while simultaneously performing forward cleaning of the first filter 220. After forward cleaning, operators can control the cleaning water from fire pump 110 to flow sequentially through the second cleaning branch 130, the second pipeline 242, the first filter 220, and the first drain pipeline 243 to perform reverse cleaning on the first filter 220. During reverse cleaning, the cleaning water flows from the inside to the outside of the filter screen of the first filter 220. Reverse cleaning effectively removes impurities adhering to the outer wall of the filter screen. Operators do not need to disassemble and clean the first filter 220, which improves the automation level of the compressed air foam system. The compressed air foam system is easy to maintain and highly reliable.

[0052] In one embodiment, such as Figure 1 , Figure 6 and Figure 7 As shown, the compressed air foam system also includes a diversion pump 400, the inlet of which is connected to the second pipeline 242 or the downstream pipeline of the foam pump 210. Optionally, a vacuum pump or a suction pump can be used as the diversion pump 400, and the inlet of the diversion pump 400 can be connected to a suitable location such as the inlet or outlet of the foam pump 210. The outlet of the diversion pump 400 can be vented or connected to a foam source; no single limitation is made here.

[0053] Those skilled in the art will understand that, because the first pipe 241 and the second pipe 242 are often empty and the foam pump 210 itself has poor self-priming capability, the existing compressed air foam system requires the foam supply unit 200 to manually fill the first pipe 241 and the second pipe 242 before supplying foam concentrate, or to adjust the outlet of the foam pump 210 to a no-load position and use the suction of the foam pump 210 to fill the first pipe 241 and the second pipe 242. Only after the first pipe 241 and the second pipe 242 are filled can the foam supply unit 200 work normally. The compressed air foam system has a low degree of automation and the foam concentrate supply speed is slow.

[0054] In this embodiment, when the inlet of the diversion pump 400 is connected to the downstream pipeline of the foam pump 210, if the foam supply unit 200 of the compressed air foam system needs to provide foam concentrate, the diversion pump 400 can be started to fill the first pipeline 241 and the second pipeline 242 with foam concentrate. After the first pipeline 241 and the second pipeline 242 are filled, the diversion pump 400 is turned off, and the foam pump 210 can drive the foam concentrate to flow normally. When the inlet of the diversion pump 400 is connected to the second pipeline 242, if the foam supply unit 200 of the compressed air foam system needs to provide foam concentrate, the diversion pump 400 can be started to fill the first pipeline 241 with foam concentrate and nearly fill the second pipeline 242 with foam concentrate. After diversion, the diversion pump 400 is turned off. The foam pump 210 can fill the second pipeline 242 with foam concentrate by its own suction. After the first pipeline 241 and the second pipeline 242 are filled, the foam pump 210 can drive the foam concentrate to flow normally.

[0055] With the above settings, when the compressed air foam system produces foam, it is not necessary to manually introduce the foam or manually adjust the outlet position of the foam pump 210, which improves the automation level of the compressed air foam system and increases the supply speed of foam concentrate.

[0056] Preferably, the inlet of the diversion pump 400 is connected to the downstream pipeline of the foam pump 210. After the diversion pump 400 diverts the liquid, the foam pump 210 does not need to drive the foam concentrate to fill the second pipeline 242. This can further improve the foam output speed of the compressed air foam system and further improve the fire extinguishing efficiency.

[0057] In a specific embodiment, such as Figure 1 , Figure 6 and Figure 7 As shown, the water supply unit 100 also includes a water tank 150, which is connected to the inlet of the fire pump 110 via a first water supply pipeline 160. Figure 1As shown, a water tank 150 may be equipped with a water inlet 151 and a water outlet 152, and a tank outlet valve 161 may be installed on the first water supply pipeline 160 to control the connection status of the first water supply pipeline 160. A water inlet 162 may also be installed on the first water supply pipeline 160, through which an external water source can be connected.

[0058] The compressed air foam system also includes a first drainage branch 410 and a second drainage branch 420. One end of the first drainage branch 410 and one end of the second drainage branch 420 are respectively connected to the inlet of the drainage pump 400. The other end of the first drainage branch 410 is connected to the first water supply pipeline 160, and the other end of the second drainage branch 420 is connected to the downstream pipeline of the foam pump 210.

[0059] Specifically, before the water supply unit 100 supplies water, the diversion pump 400 is connected to the first water supply pipeline 160 via the first diversion branch 410 to divert water, so that the fire pump 110 of the water supply unit 100 can drive the water flow. Schematic, the outlet of the foam pump 210 is connected to the connecting pipeline, and the other end of the second diversion branch 420 is connected to the connecting pipeline. Before the foam supply unit 200 supplies foam concentrate, the diversion pump 400 is connected to the downstream pipeline of the foam pump 210 via the second diversion branch 420 to divert the foam concentrate, so that the foam pump 210 can drive the foam concentrate flow.

[0060] With the above settings, the foam pump 210 can achieve "one pump for two purposes", which can draw foam concentrate or water. While ensuring the normal operation of the water supply unit 100 and the foam supply unit 200, it also helps to simplify the structure of the compressed air foam system and reduce the cost of the compressed air foam system.

[0061] In other embodiments, the compressed air foam system may also employ two separate pumps to draw water and foam concentrate respectively, without limitation.

[0062] In one specific implementation, such as Figure 1 , Figure 6 and Figure 7 As shown, a first switching valve 411 is provided on the first drainage branch 410, and a second switching valve 421 is provided on the second drainage branch 420.

[0063] Indicatively, the first switching valve 411, the second switching valve 421, and the diversion pump 400 can be electrically connected to the controller. The first switching valve 411 and the second switching valve 421 can be pneumatically or electrically controlled. When the water supply unit 100 needs to supply water, the controller can control the first switching valve 411 to open, the second switching valve 421 to close, and start the diversion pump 400 to draw water.

[0064] In one possible implementation, a control button electrically connected to the controller can be provided. For example... Figure 6 As shown, when the foam supply unit 200 adopts the external suction foam method, the user can press the control button, the controller controls the first switch valve 411 to close and the second switch valve 421 to open, start the diversion pump 400, and the foam concentrate can then flow along the... Figure 6 The direction indicated by the middle arrow shows the flow path from the external suction port 2411 through the first pipe 241, the first filter 220, the second pipe 242, the foam pump 210, the second drainage branch 420, and the drainage pump 400, thereby achieving automatic foam concentrate dispensing. Figure 7 As shown, when the foam supply unit 200 is supplied with foam concentrate from the foam source, the user can press the control button. The controller then controls the first switching valve 411 to close and the second switching valve 421 to open, starting the diversion pump 400, allowing the foam concentrate to flow along... Figure 7 The direction indicated by the middle arrow shows the foam source sequentially passing through the first pipe 241, the first filter 220, the second pipe 242, the foam pump 210, the second diversion branch 420, and the diversion pump 400, achieving automatic foam concentrate dispensing and accelerating the dispensing speed. This configuration enables the compressed air foam system to achieve a "one-button foam dispensing" function, making it easier to use and thus improving its performance and fire extinguishing efficiency.

[0065] In this embodiment, by controlling the state of the first switching valve 411 and the second switching valve 421, the drainage pump 400 can achieve water diversion or foam concentrate diversion.

[0066] In one possible implementation, a flow meter is installed on the downstream pipeline of the foam pump 210.

[0067] The outlet of foam pump 210 is connected to a connecting pipeline, on which a flow meter can be installed. When the compressed air foam system draws foam concentrate from the diversion pump 400, the flow meter detects the flow signal of the foam concentrate, indicating that the first pipeline 241 and the second pipeline 242 are full. The controller can then close the diversion pump 400 and the second switching valve 421, allowing the foam supply unit 200 to supply foam concentrate normally. This configuration ensures successful foam concentrate drawing by the diversion pump 400 while avoiding additional work for the pump, thus reducing the operating cost of the compressed air foam system.

[0068] In another possible implementation, when the drainage pump 400 draws the foam concentrate, after maintaining it for a preset time, the drainage pump 400 and the second switch valve 421 are closed to ensure that the foam concentrate fills the first pipeline 241 and the second pipeline 242.

[0069] like Figure 1As shown, the foam source includes a first foam supply device 231 and a second foam supply device. An external suction port 2411 is provided on the first pipeline 241. The end of the first pipeline 241 away from the first filter 220 is connected to the first foam supply device 231. The external suction port 2411 is used to connect to the second foam supply device.

[0070] A valve can be installed on the external suction port 2411. The foam supply unit 200 can be supplied with foam concentrate by the first foam supply device 231, or it can be connected to a second foam supply device via the external suction port 2411, with the second foam supply device supplying the foam concentrate. For example, a foam tank can be used as the first foam supply device 231. A foam valve 2412 can be installed on the first pipeline 241 to control whether the foam concentrate in the first foam supply device 231 flows out through the first pipeline 241. A check valve 820 can be installed upstream of the foam valve 2412 on the first pipeline 241. When either the first foam supply device 231 or the second foam supply device supplies foam concentrate, a priming pump 400 can be used to draw the foam concentrate, so that the foam pump 210 can drive the foam concentrate flow.

[0071] In this embodiment, the compressed air foam system can obtain foam concentrate through different foam supply devices, making it more versatile.

[0072] like Figure 1 As shown, the compressed air foam system also includes a fire monitor 500, a second water supply line 600, and a mixing line 700. One end of the mixing line 700 is connected to the downstream line of the foam pump 210 and the outlet of the fire pump 110, and the other end is connected to the fire monitor 500. One end of the second water supply line 600 is connected to the fire pump 110, and the other end is connected to the fire monitor 500.

[0073] Schematic, water supplied by water supply unit 100 and foam concentrate supplied by foam supply unit 200 can be introduced into mixing pipe 700 from one end of the mixing pipe 700 and mixed. A proportioning valve 710 can be installed on mixing pipe 700 to adjust the ratio of water and foam concentrate in mixing pipe 700. The compressed air foam system also includes an air compressor 810, which can supply compressed air into mixing pipe 700. After foam concentrate, water and compressed air are mixed in mixing pipe 700 to form foam, it can be sprayed from fire monitor 500 to achieve foam fire extinguishing. For example, air compressor 810 can be connected to mixing pipe 700 through air supply line, and check valves 820 can be installed on air supply line and mixing pipe 700 downstream of air supply line.

[0074] In scenarios where foam extinguishing is not required, the foam supply unit 200 can be shut down, and the fire pump 110 can drive water through the second water supply pipeline 600 to the fire monitor 500 and spray it out from the fire monitor 500 to extinguish the fire. A valve can be installed on the second water supply pipeline 600 to control the connection status of the second water supply pipeline 600.

[0075] With the above settings, the fire monitor 500 can spray water or foam as needed to deal with different fire fighting scenarios.

[0076] In one embodiment, such as Figure 1-5 As shown, the water supply unit 100 also includes a second filter 140 installed on the second cleaning branch 130.

[0077] For example, a Y-type filter can be used as the second filter 140. During backwashing of the first filter 220, the cleaning water entering the second pipe 242 from the second cleaning branch 130 is divided into two parts: one part enters the first filter 220 from its second port, and the other part enters the foam pump 210 via the second pipe 242. That is, the foam pump 210 can be cleaned during both forward and reverse cleaning of the first filter 220. The second filter 140 is installed on the second cleaning branch 130 to prevent impurities in the cleaning water from entering the foam pump 210 during backwashing of the first filter 220 and affecting the foam pump 210.

[0078] In one embodiment, such as Figures 1-5 As shown, the compressed air foam system also includes a first control valve 121, a second control valve 131, a drain valve 2431, and a controller. The first control valve 121 is installed on the first cleaning branch 120, the second control valve 131 is installed on the second cleaning branch 130, and the drain valve 2431 is installed on the first venting pipe 243. The first control valve 121, the second control valve 131, and the drain valve 2431 are all electrically connected to the controller.

[0079] Specifically, the controller can control the opening and closing of the first control valve 121, the second control valve 131, and the drain valve 2431. For example... Figure 2 and Figure 3 As shown, when the controller opens the first control valve 121 and closes the second control valve 131 and the drain valve 2431, the compressed air foam system can perform forward cleaning of the first filter 220. Figure 4 and Figure 5 As shown, when the controller controls the first control valve 121 to close and the second control valve 131 and the drain valve 2431 to open respectively, the compressed air foam system can achieve reverse cleaning of the first filter 220.

[0080] In one possible implementation, a cleaning button electrically connected to the controller can be provided. When the compressed air foam system completes fire extinguishing operations, the user can press the cleaning button to activate the automatic cleaning function of the compressed air foam system. The forward and reverse cleaning times can be set as needed. The compressed air foam system can first perform forward cleaning of the first filter 220, and then reverse cleaning. During the cleaning process, after the forward cleaning reaches a preset time, it can automatically switch to reverse cleaning, and after the reverse cleaning reaches a preset time, the cleaning of the first filter 220 can be terminated. The controller can also repeatedly control the forward and reverse cleaning of the first filter 220 as needed to enhance the cleaning effect.

[0081] With the above settings, automatic forward and reverse cleaning of the first filter 220 can be achieved, realizing the "one-click cleaning" function, and further improving the maintainability and reliability of the compressed air foam system.

[0082] In one embodiment, such as Figure 1 As shown, the compressed air foam system also includes a second vent pipe 300. The second vent pipe 300 is connected to the outlet of the fire pump 110 and the downstream pipe of the foam pump 210.

[0083] Schematic illustration: The outlet of foam pump 210 is connected to a connecting pipe, on which a check valve 820 can be installed. A second drain pipe 300 connects to the outlet of fire pump 110 and the connecting pipe. Excess water driven by fire pump 110 can be discharged through the second drain pipe 300. During the cleaning of the first filter 220, the cleaning water flowing from foam pump 210 can directly flow out of the compressed air foam system via the second drain pipe 300. The cleaning water flowing out of foam pump 210 will not enter other downstream pipes (such as mixing pipe 700), preventing the cleaning water from affecting the operation of other parts downstream of foam pump 210.

[0084] like Figure 1 As shown, the water supply unit 100 also includes a return pipe 170. One end of the return pipe 170 is connected to the outlet of the fire pump 110, and the other end of the return pipe 170 is connected to the water tank 150. A third switch valve 171 is installed on the return pipe 170.

[0085] Optionally, after the water in the water tank 150 is driven out by the fire pump 110, it can flow back into the water tank 150 in sequence via the first water supply pipeline 160, the fire pump 110, and the return pipeline 170. The connection status of the return pipeline 170 can be controlled by controlling the third switch valve 171.

[0086] By setting up a return pipe 170, the fire pump 110 can drive the water in the water tank 150 to circulate and then flow back into the water tank 150. This setup can be used for the testing and maintenance of the fire pump 110. In some cold regions, allowing the water in the water tank 150 to circulate can prevent the water from freezing due to prolonged stagnation in the pipes.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A compressed air foam system, characterized in that, Includes water supply units and foam supply units; The foam supply unit includes a foam pump, a first filter, and a foam source. The first filter has a first port, a second port, and a third port. The first port is connected to the foam source through a first pipeline, the second port is connected to the inlet of the foam pump through a second pipeline, and the third port is connected to a first venting pipeline. The water supply unit includes a fire pump, a first cleaning branch and a second cleaning branch. One end of the first cleaning branch and one end of the second cleaning branch are respectively connected to the outlet of the fire pump. The other end of the first cleaning branch is connected to the first pipeline, and the other end of the second cleaning branch is connected to the second pipeline.

2. The compressed air foam system according to claim 1, characterized in that, The compressed air foam system also includes a diversion pump, the inlet of which is connected to the second pipeline or the downstream pipeline of the foam pump.

3. The compressed air foam system according to claim 2, characterized in that, The water supply unit also includes a water tank, which is connected to the inlet of the fire pump via a first water supply pipeline; The compressed air foam system further includes a first drainage branch and a second drainage branch. One end of the first drainage branch and one end of the second drainage branch are respectively connected to the inlet of the drainage pump. The other end of the first drainage branch is connected to the first water supply pipeline, and the other end of the second drainage branch is connected to the downstream pipeline of the foam pump.

4. The compressed air foam system according to claim 3, characterized in that, A first switching valve is provided on the first drainage branch, and a second switching valve is provided on the second drainage branch.

5. The compressed air foam system according to claim 2, characterized in that, A flow meter is installed on the downstream pipeline of the foam pump; and / or, The foam source includes a first foam supply device and a second foam supply device. An external suction port is provided on the first pipeline. The end of the first pipeline away from the first filter is connected to the first foam supply device. The external suction port is used to connect to the second foam supply device.

6. The compressed air foam system according to claim 1, characterized in that, The water supply unit also includes a second filter installed on the second cleaning branch.

7. The compressed air foam system according to claim 1, characterized in that, The compressed air foam system further includes a first control valve, a second control valve, a drain valve, and a controller. The first control valve is installed on the first cleaning branch, the second control valve is installed on the second cleaning branch, and the drain valve is installed on the first venting pipeline. The first control valve, the second control valve, and the drain valve are all electrically connected to the controller.

8. The compressed air foam system according to claim 1, characterized in that, The compressed air foam system also includes a second venting pipeline, which is connected to the outlet of the fire pump and the downstream pipeline of the foam pump.

9. The compressed air foam system according to claim 3, characterized in that, The water supply unit also includes a return pipeline, one end of which is connected to the outlet of the fire pump, and the other end of which is connected to the water tank. A third switch valve is installed on the return pipeline.

10. The compressed air foam system according to any one of claims 1-9, characterized in that, The compressed air foam system also includes a fire monitor, a second water supply pipeline, and a mixing pipeline. One end of the mixing pipeline is connected to the downstream pipeline of the foam pump and the outlet of the fire pump, respectively, and the other end of the mixing pipeline is connected to the fire monitor. One end of the second water supply pipeline is connected to the fire pump, and the other end of the second water supply pipeline is connected to the fire monitor.

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