Compressed gas foam generating device

Abstract

The utility model relates to a compressed gas foam generating device. The existing device system is very complicated, has extremely high requirements on the technical capabilities of production, manufacturing, maintenance, operation and use, and is high in manufacturing cost. The foam mixer comprises a foam mixer shell, one end of the shell is provided with a water supply connector, the other end of the shell is provided with a foam output connector, and the side portion of the shell is provided with an air inlet and a liquid inlet. The liquid inlet is connected with a foam liquid container through a liquid suction pipe; a piston spray head is arranged in an inner cavity of the shell, a pressure spring is arranged on the outer wall of the piston spray head, and the piston spray head is provided with a piston gas injection port and a piston gas collection bin; the piston gas collecting bin and the piston gas injection port are communicated with an inner cavity of the piston spray head, and the piston gas collecting bin and the gas inlet are switched to be in a connected or closed state through movement of the piston. The device is simple and reasonable in structure, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fire-fighting equipment, and in particular to a device that uses the Venturi effect to suck up foam liquid, injects positive pressure, and mixes compressed gas and pressurized water in a certain proportion to output foam. Background Technology

[0002] Compressed air foam fire extinguishing systems have advantages such as high efficiency, low consumption, versatility, light weight, and environmental friendliness. They are widely used by fire and rescue teams and high-value, high-risk units, making a significant contribution to ensuring fire safety in urban development and economic construction. Therefore, they have also become a research direction for many researchers and fire protection system manufacturers.

[0003] Compressed air foam generating devices are classified into premixed compressed air foam generating devices and non-premixed compressed air foam generating devices according to the foam liquid mixing method.

[0004] Premixed compressed air foam generating devices mainly include foam premixed storage tanks, foam premixed liquid power units, air supply devices, gas-liquid mixing devices, and pipelines. To ensure portability, foam premixed liquid storage tanks can only be designed to be less than 200 liters, thus limiting capacity and the duration of fire extinguishing operations, typically within 200 seconds. To ensure foam extinguishing performance, the premixed liquid can only be mixed and processed at the foam liquid factory, resulting in higher costs. Furthermore, restoration after use is difficult, requiring the release of compressed gas from the storage tank, disassembly of components, refilling with premixed liquid, and then reinstallation.

[0005] Non-premixed compressed air foam generating devices mainly include water supply devices, air supply devices, foam liquid storage tanks, foam proportioning mixing devices, gas-liquid mixing devices, control units, and pipelines. The foam proportioning mixing device consists of a foam pump, power supply, and other auxiliary equipment. The control unit comprises a control center, flow meters, pressure transmitters, etc. Typically, a flow sensor collects information on changes in the water pump's output flow rate, transmits this information to the air foam proportioning control center for calculation, and then issues commands to control the output of the system's air pump and foam pump to ensure the proportional mixing of foam liquid, gas, and water. Therefore, the system is extremely complex, requiring highly skilled personnel in manufacturing, maintenance, and operation, and is also very expensive. Utility Model Content

[0006] This invention addresses the aforementioned problems by providing a compressed gas foam generating device with a simple and reasonable structure, which reduces production costs.

[0007] Therefore, the present invention adopts the following technical solution: a compressed gas foam generating device, comprising a foam mixer housing, one end of which is provided with a water supply interface and the other end with a foam output interface, and an air inlet and a liquid inlet on the side of the housing, characterized in that a negative pressure chamber composed of flow channels is formed inside the housing, the negative pressure chamber is connected to the liquid inlet, and the liquid inlet is connected to a foam liquid container through a suction pipe; a piston nozzle is installed in the inner cavity of the housing, a pressure spring is provided on the outer wall of the piston nozzle, and the piston nozzle is provided with a piston air injection port and a piston air collection chamber; the piston air collection chamber and the piston air injection port are connected to the inner cavity of the piston nozzle, and the movement of the piston causes the piston air collection chamber and the air inlet to switch between connected or closed states.

[0008] Preferably, the inlet end of the inner cavity of the housing is a cylindrical piston cylinder, the middle part of the inner cavity of the piston nozzle is a conical constricted flow channel, and the downstream of the conical constricted flow channel is a pressure boosting flow channel, which is a cylindrical channel.

[0009] Preferably, the foam mixer housing has a jet receiving channel in the middle of the inner cavity, an extended channel at the outlet end of the jet receiving channel, a cylindrical channel in the middle section that communicates with the negative pressure chamber, and a proportional inlet valve at the liquid inlet.

[0010] Preferably, the piston gas collection chamber is tangent to the foam mixer shell to form two chambers, one of which is connected to the piston gas injection port and the other is disconnected from the piston gas injection port, forming a closed state.

[0011] Preferably, the inner cavity of the foam mixer housing is provided with a piston limiting ring.

[0012] Preferably, the air inlet is equipped with a one-way valve, one end of which is connected to the air inlet by a connector in a threaded manner, and the one-way valve has its own flow throttling orifice plate.

[0013] Preferably, the other end of the one-way valve is provided with a gas pipeline, the other end of the gas pipeline is provided with a pressure regulator, and the other end of the pressure regulator is provided with a gas supply device.

[0014] Preferably, the foam mixer housing is equipped with a pressure gauge, which is connected to the foam mixer housing by a thread, for monitoring the working pressure of the compressed gas foam generating device.

[0015] Preferably, one end of the water supply interface adopts a fire-resistant internal snap-fit ​​interface, which is connected to the foam mixer housing by means of a thread, and the other end can be connected to a fire truck or fire pump. The foam output interface of the foam mixer is a fire-resistant internal snap-fit ​​interface.

[0016] Preferably, the proportional inlet valve is equipped with a suction pipe, which is connected to the foam liquid container.

[0017] The beneficial effects of this utility model are as follows: it improves the system principle of the compressed gas foam generating device, simplifies the structural design, reduces production costs, enhances practicality, and enables the development of a more advanced compressed gas foam generating device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a partial structural schematic diagram of the present invention.

[0020] Figure 3 This is an enlarged schematic diagram of part A of this utility model.

[0021] In the diagram: 1. Foam mixer housing; 2. Piston nozzle; 3. Pressure spring; 4. Proportional inlet valve; 5. Check valve; 6. Inlet; 7. Gas supply device; 8. Pressure regulator; 9. Pressure gauge; 10. Piston air injection port; 11. Piston air collection chamber; 12. Foam mixer housing air inlet; 13. Foam mixer water supply interface; 14. Foam mixer foam output interface; 15. Suction pipe; 16. Foam liquid container; 17. Piston limit ring; 18. Gas pipeline; 19. Sealing ring; 20. Conical constriction flow channel; 21. Pressure boosting flow channel; 22. Pressure boosting jet end face; 23. Jet receiving flow channel; 24. Jet receiving flow channel end face; 25. Expanding flow channel; 26. Negative pressure chamber. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] like Figures 1-3 The device for generating compressed gas foam shown includes a foam mixer housing. One end of the housing is provided with a water supply interface 13, and the other end is provided with a foam output interface 14. An air inlet 12 is provided on one side of the housing, and a liquid inlet 6 is provided on the other side. A negative pressure chamber 26 composed of flow channels is formed inside the housing. The negative pressure chamber is connected to the liquid inlet, and the liquid inlet is connected to a foam liquid container 16 through a suction pipe 15. A piston nozzle 2 is installed in the inner cavity of the housing 1. A pressure spring 3 is provided on the outer wall of the piston nozzle 2. The piston nozzle is provided with a piston air injection port 10 and a piston air collection chamber 11. The piston air collection chamber 11 and the piston air injection port 10 are connected to the inner cavity of the piston nozzle 2. The movement of the piston causes the piston air collection chamber 11 to switch between being connected and closed with the air inlet 12.

[0024] like Figure 2 As shown, in one embodiment, the inner cavity inlet end of the housing 1 is a cylindrical piston cylinder, the middle part of the inner cavity of the piston nozzle 2 is a conical constricted flow channel 20, and downstream of the conical constricted flow channel 20 are a pressure boosting flow channel 21 and a pressure boosting flow channel end face 22. The pressure boosting flow channel 21 is a cylindrical channel.

[0025] Specifically, the inner cavity of the foam mixer housing 1 is provided with a jet receiving channel 23 and a jet receiving channel end face 24. The outlet end of the jet receiving channel 23 is provided with an expansion channel 25. The cylindrical channel in the middle section is connected to the negative pressure chamber. The liquid inlet 6 is provided with a proportional liquid inlet valve 4. Preferably, the expansion channel 25 is in the shape of a funnel.

[0026] like Figure 3 As shown, the piston gas collecting chamber is tangent to the foam mixer housing 1, forming two chambers. One chamber is connected to the piston gas injection port 10, while the other chamber is disconnected from the piston gas injection port 10, forming a closed state. Sealing rings 19 are provided at both ends of the piston gas collecting chamber 11.

[0027] Specifically, the inner cavity of the foam mixer housing 1 is provided with a piston limiting ring 17.

[0028] Specifically, the air inlet 12 is equipped with a one-way valve 5, one end of which is connected to the air inlet 12 by a connector in the form of a thread. The one-way valve 5 has its own flow throttling orifice plate.

[0029] Specifically, the other end of the one-way valve 5 is equipped with a gas pipeline 18, the other end of the gas pipeline 18 is equipped with a pressure regulator 8, and the other end of the pressure regulator 8 is equipped with a gas supply device 7. The gas supply device 7 is one or more sets of compressed gas cylinders or an air compressor.

[0030] Specifically, the foam mixer housing 1 is equipped with a pressure gauge 9, which is connected to the foam mixer housing 1 by a thread, and is used to monitor the working pressure of the compressed gas foam generating device.

[0031] Specifically, one end of the water supply interface 13 adopts a fire-resistant internal snap-fit ​​interface, which is connected to the foam mixer housing 1 by means of a thread, and the other end can be connected to a fire truck or fire pump. The foam output interface 14 of the foam mixer is a fire-resistant internal snap-fit ​​interface.

[0032] Specifically, the proportional liquid inlet valve 4 is equipped with a liquid suction pipe 15, which is connected to the foam liquid container 16.

[0033] The working process of this utility model is as follows: The water supply interface 13 of the foam mixer is connected to the fire pump for water supply. After the water pressure rises to the set value, it pushes the piston nozzle 2, so that the pressure-boosting jet end face 23 and the jet receiving channel end face 24 reach the preset distance; the pressure water is rapidly increased due to the narrowing of the channel, and the water flow is sprayed at high speed into the jet receiving channel. In the expanded channel, the space suddenly expands and the pressure drops suddenly. The pressure-boosting jet end face 23 and the jet receiving channel end face directly form a negative pressure chamber 26. Under the action of negative pressure, the foam stored in the foam liquid container 16 is sucked into the jet receiving channel for mixing; at the same time, the movement of the piston nozzle 2 connects the piston gas collection chamber 11 with the air inlet 12 of the foam mixer shell. Compressed gas is injected into the inner cavity of the piston nozzle 2 and mixed with the pressure water. It continues to flow into the jet receiving channel, completing the mixing of compressed gas, foam liquid and pressure water, and is sprayed into the atmosphere to generate compressed gas foam.

[0034] When the foam output port 14 of the foam mixer is closed, the pressure between the booster flow channel 21 and the expansion flow channel is equal, resulting in the loss of thrust on the piston nozzle 2. The pressure spring 3 pushes the piston nozzle 3 back to the piston limit ring, causing the piston gas collection chamber 11 to be misaligned with the air inlet 12 of the foam mixer housing, forming a closed space and stopping the gas supply. The one-way shut-off function of the proportional liquid inlet valve 4 is closed, terminating the operation of the entire compressed gas foam generating device. When the foam output port 14 of the foam mixer is reopened, the entire compressed gas foam generating device starts up and operates in a cyclical manner.

[0035] This invention enables the proportional mixing of three media by matching the working pressure, compressed gas pressure, flow channel diameter, and pressure proportional regulating valve. The foam liquid container 16 is an atmospheric pressure container, which can be added as needed without stopping the machine, allowing the entire compressed gas foam generating device to operate continuously.

[0036] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A compressed gas foam generating device comprising a foam mixer housing, one end of which is provided with a water inlet (13), the other end is provided with a foam outlet (14), the side of the foam mixer housing is provided with an air inlet (12) and a liquid inlet (6), characterized in that The foam mixer shell is provided with a negative pressure chamber formed by a flow channel, the negative pressure chamber is connected with a liquid inlet, the liquid inlet is connected with a foam liquid container through a liquid suction pipe; the inner cavity of the foam mixer shell (1) is provided with a piston nozzle (2), the outer wall of the piston nozzle (2) is provided with a pressure spring (3), the piston nozzle is provided with a piston gas injection port (10) and a piston gas collection chamber (11); the piston gas collection chamber (11), the piston gas injection port (10) and the inner cavity of the piston nozzle (2) are communicated, and the movement of the piston makes the piston gas collection chamber (11) switch between the open state and the closed state with the gas inlet (12).

2. A compressed gas foam generating device according to claim 1, characterised in that The inner cavity of the foam mixer shell (1) is provided with a conical necked flow channel (20) in the middle part of the inner cavity of the piston nozzle (2), the downstream of the conical necked flow channel (20) is a pressure boosting flow channel (21), and the pressure boosting flow channel (21) is a cylindrical channel.

3. A compressed gas foam generating device according to claim 2, wherein The inner cavity of the foam mixer shell (1) is provided with a jet flow receiving flow channel (23) in the middle part, the outlet end of the jet flow receiving flow channel (23) is provided with an expansion flow channel (25), the cylindrical channel of the middle section is communicated with the negative pressure chamber, and the liquid inlet (6) is provided with a proportional liquid inlet valve (4).

4. A compressed gas foam generating device according to any one of claims 1 to 3, characterised in that The piston gas collection chamber is tangent to the foam mixer shell (1) to form two chambers, one of the chambers is communicated with the piston gas injection port (10), and the other chamber is disconnected with the piston gas injection port (10) to form a closed state.

5. A compressed gas foam generating device according to claim 4, wherein The inner cavity of the foam mixer shell (1) is provided with a piston limiting ring (17).

6. A compressed gas foam generating device according to claim 5, wherein The gas inlet (12) is provided with a one-way valve (5), one end of the one-way valve (5) is connected with the gas inlet (12) in a threaded form, and the one-way valve (5) is provided with a through-orifice throttling orifice plate.

7. A compressed gas foam generating device according to claim 6, wherein The other end of the one-way valve (5) is provided with a gas pipeline (18), the other end of the gas pipeline (18) is provided with a pressure stabilizer (8), and the other end of the pressure stabilizer (8) is provided with a gas supply device (7).

8. A compressed gas foam generating device according to claim 1, wherein The foam mixer shell (1) is provided with a pressure gauge (9) connected with the foam mixer shell (1) in a threaded form.

9. A compressed gas foam generating device according to claim 1, wherein One end of the water supply interface (13) is provided with a fire-fighting inner buckle type interface connected with the foam mixer shell (1) in a threaded form, the other end can be connected with a fire truck or a fire pump, and the foam output interface (14) is a fire-fighting inner buckle type interface.

10. A compressed gas foam generating device according to claim 3, wherein The proportional liquid inlet valve (4) is provided with a liquid suction pipe (15), and the liquid suction pipe (15) is connected with a foam liquid container (16).

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