Foam proportional mixing device
The foam proportion mixing device addresses venturi tube limitations by using electric proportional valves and flow meters for precise and flexible mixing ratio adjustment, ensuring accurate and user-friendly operation with manual override and backflow prevention.
Patent Information
- Application Number
- CN202420058783.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-09
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-09
AI Technical Summary
Existing foam fire extinguishing devices face limitations in mixing ratio adjustment due to venturi tube negative pressure suction, which is flow rate dependent and lacks precision and flexibility.
A foam proportion mixing device utilizing electric proportional valves and flow meters to adjust the mixing ratio of foam and water independently, with manual and automatic control options, and incorporating one-way valves to prevent backflow, supported by a backup power supply and level gauges for precise mixing.
Enables wide-ranging, precise, and flexible mixing ratio adjustments without flow rate limitations, ensuring high accuracy and ease of operation with manual override, while preventing backflow and maintaining pressure balance.
Smart Images
Figure CN222195812U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foam fire extinguishing devices, in particular to a foam proportion mixing device. Background Art
[0002] The foam fire extinguishing device can spray a large amount of foam, which can adhere to the combustibles, isolate the combustibles from the air, and reduce the temperature, destroying the combustion conditions. It is a highly efficient fire extinguishing device. When the foam fire extinguishing device is extinguishing a fire, the foam concentrate, that is, the foam stock solution, must be fully mixed with water in a specified proportion and foamed before it can be sprayed through the spraying equipment for fire extinguishing. Therefore, the proportion mixing device is an important component to ensure that the foam fire extinguishing device has the correct water and foam stock mixing ratio and ensures its fire extinguishing effect.
[0003] At present, most foam fire extinguishing devices use a venturi tube to absorb foam stock solution using negative pressure. For example, patent CN110404214A discloses a negative pressure foam proportion automatic mixing system for fire trucks, and specifically discloses that when the foam proportioning valve is opened, the venturi tube will suck in foam, so that the foam flows into the outlet pipe through the venturi switch valve and mixes with water. Although this venturi negative pressure suction structure can mix water and foam stock solution in proportion, the venturi tube needs to generate negative pressure through a high flow rate. If the rear end pipeline is thin and the flow resistance is large, it will cause its flow rate to decrease, thereby affecting the suction of the foam stock solution. It can be seen that the mixing ratio adjustment range applicable to this venturi negative pressure suction structure is limited, and the mixing ratio cannot be adjusted well. Utility Model Content
[0004] The utility model aims to overcome the deficiencies of the prior art and provide a foam proportion mixing device which has a simple structure, a wide range of applications, can automatically adjust the mixing ratio and has high precision.
[0005] The purpose of the utility model is achieved through the following technical measures: a foam proportion mixing device, comprising a foam raw liquid tank, a water tank, a raw liquid pump, a mixed liquid pump and a main control board, the outlet of the foam raw liquid tank is connected to a first electric proportional valve, the outlet of the first electric proportional valve is connected to the inlet of the raw liquid pump, the outlet of the raw liquid pump is connected to a raw liquid flow meter, the outlet of the water tank is connected to a second electric proportional valve, the outlet of the second electric proportional valve is connected to a water flow meter, the outlets of the water flow meter and the raw liquid flow meter are both connected to the inlet of the mixed liquid pump, and the main control board is respectively connected to the first electric proportional valve, the raw liquid pump, the raw liquid flow meter, the second electric proportional valve, the water flow meter and the mixed liquid pump.
[0006] Furthermore, a first manual regulating valve is provided between the raw liquid flow meter and the mixed liquid pump.
[0007] Furthermore, a second manual regulating valve is provided between the water flow meter and the mixed liquid pump.
[0008] Furthermore, a first one-way valve is provided between the raw liquid flow meter and the mixed liquid pump.
[0009] Furthermore, a second one-way valve is provided between the water flow meter and the mixed liquid pump.
[0010] Furthermore, it also includes a fixing plate, and the fixing plate is used to support the foam proportion mixing device.
[0011] Furthermore, a backup power supply is also included.
[0012] Furthermore, the foam raw liquid tank is also provided with a first liquid level gauge and a first air permeability valve.
[0013] Furthermore, the water tank is also provided with a second liquid level gauge and a second air valve.
[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the application adopts a stock liquid pump instead of a venturi tube, does not require negative pressure suction, is not limited by flow rate, and has a wide range of applications. The application adjusts the flow of the foam liquid through the first electric proportional valve and the stock liquid flowmeter, and adjusts the flow of water through the second electric proportional valve and the water flowmeter, thereby achieving the mixing ratio adjustment of the foam stock liquid and water, and can achieve automatic adjustment of the mixing ratio through the main control board. Moreover, the first electric proportional valve and the second electric proportional valve of the application are used to control the foam ratio value, with high control accuracy and easy operation. The application can realize manual adjustment of the mixing ratio through the first manual regulating valve and the second manual regulating valve. The application can avoid the backflow of the mixed liquid and damage to the flowmeter by setting the first one-way valve and the second one-way valve.
[0015] The utility model is described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Among them, 1. foam raw liquid tank, 2. water tank, 3. first electric proportional valve, 4. raw liquid pump, 5. raw liquid flow meter, 6. first manual regulating valve, 7. mixed liquid pump, 8. first one-way valve, 9. three-way, 10. second one-way valve, 11. second manual regulating valve, 12. water flow meter, 13. second electric proportional valve, 14. fixed plate, 15. backup power supply, 16. liquid outlet pipe, 17. main control board. DETAILED DESCRIPTION
[0018] like Figure 1As shown, a foam proportion mixing device includes a foam raw liquid tank 1, a water tank 2, a raw liquid pump 4, a mixed liquid pump 7 and a main control board 17, wherein the foam raw liquid tank 1 is used to store foam raw liquid, the water tank 2 is used to store water, the outlet of the foam raw liquid tank 1 is connected to a first electric proportional valve 3, the outlet of the first electric proportional valve 3 is connected to the inlet of the raw liquid pump 4, the outlet of the raw liquid pump 4 is connected to a raw liquid flow meter 5, the outlet of the water tank 2 is connected to a second electric proportional valve 13, the outlet of the second electric proportional valve 13 is connected to the inlet of the raw liquid pump 4, the outlet of the raw liquid pump 4 is connected to the raw liquid flow meter 5, the outlet of the water tank 2 is connected to the second electric proportional valve 13 The outlet is connected to a water flow meter 12, and the outlets of the water flow meter 12 and the stock liquid flow meter 5 are both connected to the inlet of the mixed liquid pump 7. Specifically, the inlet of the mixed liquid pump 7 can be connected to a tee 9 and connected to the a interface of the tee 9, the b interface of the tee 9 is connected to the outlet of the water flow meter 12, and the c interface of the tee 9 is connected to the outlet of the stock liquid flow meter 5. The main control board 17 is respectively connected to the first electric proportional valve 3, the stock liquid pump 4, the stock liquid flow meter 5, the second electric proportional valve 13, the water flow meter 12 and the mixed liquid pump 7. When working, the stock liquid pump 4 transports the foam stock liquid from the foam stock liquid tank 1 through the first electric proportional valve 3 and the stock liquid flow meter 5 to the mixed liquid pump 7, and at the same time, the mixed liquid pump 7 sucks water from the water tank 2 through the second electric proportional valve 13 and the water flow meter 12 into the mixed liquid pump 7. After the foam stock liquid and water are mixed in the mixed liquid pump 7, they are transported from the outlet of the mixed liquid pump 7 through the liquid outlet pipe 16 to the subsequent foam generating device for foaming. The present application adopts a stock liquid pump 4 to replace the venturi tube, which does not require negative pressure suction and is not limited by flow rate. The present application adjusts the flow of the foam liquid through the first electric proportional valve 3 and the stock liquid flow meter 5, and adjusts the flow of water through the second electric proportional valve 13 and the water flow meter 12, thereby achieving the adjustment of the mixing ratio of the foam stock liquid and water. Moreover, the present application uses the first electric proportional valve 3 and the second electric proportional valve 13 to control the foam ratio value, with high control accuracy and simple operation.
[0019] A first manual regulating valve 6 is further provided between the raw liquid flow meter 5 and the mixed liquid pump 7 , and the flow rate of the foam raw liquid can be manually regulated by the first manual regulating valve 6 .
[0020] A second manual regulating valve 11 is further provided between the water flow meter 12 and the mixed liquid pump 7 , and the water flow rate can be manually regulated by the second manual regulating valve 11 .
[0021] A first one-way valve 8 is further provided between the raw liquid flow meter 5 and the mixed liquid pump 7. Specifically, the first one-way valve 8 is provided at the outlet end of the first manual regulating valve 6. The first one-way valve 8 can prevent the mixed liquid from flowing back.
[0022] A second one-way valve 10 is further provided between the water flow meter 12 and the mixed liquid pump 7. Specifically, the second one-way valve 10 is provided at the outlet end of the second manual regulating valve 11. The second one-way valve 10 can prevent the mixed liquid from flowing back.
[0023] It also includes a fixing plate 14, which is used to support the foam proportion mixing device. Specifically, the foam raw liquid tank 1, the water tank 2, the first electric proportional valve 3, the raw liquid pump 4, the raw liquid flow meter 5, the second electric proportional valve 13, the water flow meter 12 and the mixed liquid pump 7 are all fixed on the fixing plate 14, and the foam proportion mixing device can be installed as a whole through the fixing plate 14.
[0024] The device further comprises a backup power supply 15 , which may be a UPS (uninterruptible power supply). The backup power supply 15 supplies power to the foam proportioning device.
[0025] The foam liquid tank 1 is further provided with a first liquid level meter and a first air-permeable valve. The first liquid level meter is used to detect the liquid level in the foam liquid tank 1 , and the first air-permeable valve is used to maintain the pressure balance in the foam liquid tank 1 .
[0026] The water tank 2 is also provided with a second liquid level gauge and a second air valve. The second liquid level gauge is used to detect the liquid level in the water tank 2 , and the second air valve is used to maintain the pressure balance in the water tank 2 .
[0027] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.
[0028] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A foam proportioning device, characterized in that: It includes a foam raw liquid tank, a water tank, a raw liquid pump, a mixed liquid pump and a main control board, the outlet of the foam raw liquid tank is connected to a first electric proportional valve, the outlet of the first electric proportional valve is connected to the inlet of the raw liquid pump, the outlet of the raw liquid pump is connected to a raw liquid flow meter, the outlet of the water tank is connected to a second electric proportional valve, the outlet of the second electric proportional valve is connected to a water flow meter, the outlets of the water flow meter and the raw liquid flow meter are both connected to the inlet of the mixed liquid pump, and the main control board is respectively connected to the first electric proportional valve, the raw liquid pump, the raw liquid flow meter, the second electric proportional valve, the water flow meter and the mixed liquid pump.
2. The foam proportioning device according to claim 1, characterized in that: A first manual regulating valve is also provided between the raw liquid flow meter and the mixed liquid pump.
3. The foam proportioning device according to claim 1, characterized in that: A second manual regulating valve is also provided between the water flow meter and the mixed liquid pump.
4. The foam proportioning device according to claim 1, characterized in that: A first one-way valve is also provided between the raw liquid flow meter and the mixed liquid pump.
5. The foam proportioning device according to claim 1, characterized in that: A second one-way valve is also provided between the water flow meter and the mixed liquid pump.
6. The foam proportioning device according to claim 1, characterized in that: Also included is a fixing plate for supporting the foam proportioning device.
7. The foam proportioning device according to claim 1, characterized in that: A backup power supply is also included.
8. The foam proportioning device according to claim 1, characterized in that: The foam raw liquid tank is also provided with a first liquid level meter and a first air permeability valve.
9. The foam proportioning device according to claim 1, characterized in that: The water tank is also provided with a second liquid level gauge and a second air permeability valve.