Vehicle-mounted electric foam proportioning mixer

Abstract

The utility model discloses a vehicle-mounted electric foam proportioner, which relates to the technical field of foam proportioner, and comprises a control module, a mixing pipe and an electric valve, the mixing pipe is provided with a pressure water inlet for introducing pressure water and a foam liquid inlet for introducing foam liquid, and the electric valve is arranged at the foam liquid inlet. The electrically operated valve is used for controlling the amount of the foam liquid introduced into the mixing pipe, the mixing pipe is further provided with a mixed liquid outlet used for discharging mixed liquid of the pressure water and the foam liquid, and the control module is electrically connected with the electrically operated valve and controls the electrically operated valve to be opened at different opening degrees. The foam proportion adjusting device is simple in structure and capable of automatically and accurately adjusting the foam proportion.

Description

Technical Field

[0001] The utility model relates to the technical field of foam proportion mixing, in particular to a vehicle-mounted electric foam proportion mixer. Background Art

[0002] At present, my country's foam fire trucks basically adopt two modes: one is to adopt a fully automatic (or intelligent) foam proportion mixing system, but its price is high, the system is relatively complex, and it requires corresponding installation space. It is often used on urban main battle vehicles and large foam trucks; the other is the commonly used manual foam proportion mixer. However, the adjustment of the foam ratio is limited during use. Usually there is only one fixed ratio, namely 3% or 6%, and the manual control accuracy is poor, the operation requirements are high, and the water flow cannot be confirmed. It relies only on experience evaluation and cannot fully meet the requirements of modern fire truck equipment. Utility Model Content

[0003] The purpose of the utility model is to provide a vehicle-mounted electric foam proportioning mixer to solve the problems existing in the above-mentioned prior art, which has a simple structure and can automatically and accurately adjust the foam proportion.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The utility model provides a vehicle-mounted electric foam proportioning mixer, which comprises a control module, a mixing tube and an electric valve. The mixing tube is provided with a pressure water inlet for introducing pressure water, and a foam liquid inlet for introducing foam liquid, and the electric valve is installed at the foam liquid inlet. The electric valve is used to control the amount of foam liquid introduced into the mixing tube. The mixing tube is also provided with a mixed liquid outlet for discharging a mixed liquid of pressure water and foam liquid. The control module is electrically connected to the electric valve and controls the electric valve to open at different opening degrees.

[0006] Preferably, the mixing tube is a Venturi tube.

[0007] Preferably, the electric valve is provided with a liquid inlet and a liquid outlet, the liquid inlet is used to introduce the foam liquid, and the liquid outlet is connected to and communicated with the foam liquid inlet.

[0008] Preferably, the control module includes a control unit, a cleaning switch and an adjusting switch, the cleaning switch and the adjusting switch are both electrically connected to the control unit, and the control unit is also electrically connected to the electric valve; when the cleaning switch is turned on and the adjusting switch is closed, the control unit controls the electric valve to be fully opened, and when the cleaning switch is closed and the adjusting switch is adjusted to different gears, the control unit controls the electric valve to open with different opening degrees.

[0009] Preferably, the regulating switch includes a selection knob, a first proportional area, a second proportional area and a closing gear. The selection knob is electrically connected to the control unit. When the selection knob is rotated to point to the first proportional area, the control unit controls the electric valve to operate according to a foam ratio of 3%. When the selection knob is rotated to point to the second proportional area, the control unit controls the electric valve to operate according to a foam ratio of 6%. When the selection knob is rotated to point to the closing gear, the control unit controls the electric valve to close.

[0010] Preferably, the first proportional area and the second proportional area each include five flow gears, and the five flow gears are used to output foam liquid flow values ​​corresponding to the mixed liquid of 8L / s, 16L / s, 24L / s, 32L / s and 48L / s respectively.

[0011] Preferably, the closing position is located between the first proportional region and the second proportional region.

[0012] Preferably, the cleaning switch is connected to the electric valve via a control line.

[0013] Preferably, the control module further includes a cleaning indicator light, which is electrically connected to the cleaning switch and can light up when the cleaning switch is turned on.

[0014] Compared with the prior art, the utility model has achieved the following technical effects:

[0015] The utility model provides a vehicle-mounted electric foam proportioning mixer, wherein a mixing tube is provided with a pressure water inlet for introducing pressure water, and a foam liquid inlet for introducing foam liquid, and an electric valve is installed at the foam liquid inlet, and the electric valve is used to control the amount of foam liquid introduced into the mixing tube, thereby overcoming the uncertainty of manually operating the valve, and because it is electrically controlled, it is not restricted by the installation space, and the mixing tube is further provided with a mixed liquid outlet for discharging the mixed liquid of pressure water and foam liquid, the control module is electrically connected to the electric valve, and controls the electric valve to open with different opening degrees, so as to accurately control the amount of foam liquid introduced, thereby realizing automatic and accurate adjustment of the foam ratio, and the overall structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1This is a schematic structural diagram of the vehicle-mounted electric foam proportioning mixer in the present utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the control module in the present utility model;

[0019] Figure 3 This is the control principle diagram of the present utility model;

[0020] In the figure: 101-mixing tube, 102-electric valve, 103-control module, 104-mixed liquid outlet, 105-liquid inlet, 106-liquid outlet, 107-foam liquid inlet, 108-pressure water inlet, 109-control line, 201-voltage stabilizing unit, 202-selection unit, 203-output unit, 204-cleaning unit, 205-drive unit, 301-cleaning switch, 302-cleaning indicator light, 303-selection knob, 304-flow gear, 305-second proportional area, 306-off gear, 307-first proportional area. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The utility model aims to provide a vehicle-mounted electric foam proportion mixer to solve the problems existing in the prior art, which has a simple structure and can automatically and accurately adjust the foam proportion.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] like Figure 1-Figure 3As shown, this embodiment provides a vehicle-mounted electric foam proportioning mixer, including a control module 103, a mixing tube 101 and an electric valve 102. The mixing tube 101 is provided with a pressure water inlet 108 for introducing pressure water, and a foam liquid inlet 107 for introducing foam liquid, and the electric valve 102 is installed at the foam liquid inlet 107. The electric valve 102 is used to control the amount of foam liquid introduced into the mixing tube 101, overcoming the uncertainty of manually operating the valve, and because it is electrically controlled, it is not limited by the installation space, and overcomes the defect of the traditional manual operation of the valve requiring manual remote monitoring of the flow indication on the valve. The mixing tube 101 is also provided with a mixed liquid outlet 104 for discharging the mixture of pressure water and foam liquid. The control module 103 is electrically connected to the electric valve 102, and controls the electric valve 102 to open at different openings to accurately control the amount of foam liquid introduced, thereby realizing automatic and precise adjustment of the foam ratio. The overall structure is simple and easy to operate. The entire vehicle-mounted electric foam proportioning mixer can be easily connected to the fire truck by simply equipping it with corresponding pipelines. It has the characteristics of strong operability, advanced design, easy installation, no need for debugging, quick, simple and convenient operation, and low price.

[0025] Specifically, the mixing tube 101 is a Venturi tube.

[0026] The electric valve 102 is provided with a liquid inlet 105 and a liquid outlet 106 . The liquid inlet 105 is used to introduce foam liquid, and the liquid outlet 106 is connected to and communicates with the foam liquid inlet 107 , thereby realizing quantitative introduction of foam liquid into the mixing tube 101 through the control of the electric valve 102 .

[0027] Control module 103 automatically controls the opening of electric valve 102. The system also provides the fire pump speed and pressure corresponding to the current mode, allowing the user to easily control the water flow rate and, in turn, adjust the foam ratio of the mixed liquid output by the venturi tube. This design ensures that this embodiment is fully functional, simple in structure, easy to operate, and offers high mixing accuracy at a low cost, making it suitable for small-tonnage foam fire trucks.

[0028] The control module 103 includes a control unit, a cleaning switch 301, and an adjustment switch. The cleaning switch 301 and the adjustment switch are both electrically connected to the control unit, which is also electrically connected to the electric valve 102. This allows the control unit to control the different openings of the electric valve 102 through the operation of the cleaning switch 301 and the adjustment switch. When the cleaning switch 301 is on and the adjustment switch is off, the control unit controls the electric valve 102 to fully open, thereby achieving all-round cleaning of the area where the foam liquid flows. When the cleaning switch 301 is off and the adjustment switch is adjusted to different gears, the control unit controls the electric valve 102 to open at different openings to achieve different foam ratios. The control unit outputs a precise voltage value of 0 to 10V (or 0 to 5V) through the control line 109 to accurately control the opening of the electric valve 102.

[0029] The regulating switch includes a selection knob 303, a first ratio region 307, a second ratio region 305, and an off position 306. The selection knob 303 is electrically connected to a control unit. When the selection knob 303 is rotated to point to the first ratio region 307, the control unit controls the electric valve 102 to operate at a 3% foam ratio. When the selection knob 303 is rotated to point to the second ratio region 305, the control unit controls the electric valve 102 to operate at a 6% foam ratio, thereby increasing the scope of application. When the selection knob 303 is rotated to point to the off position 306, the control unit controls the electric valve 102 to close, thereby stopping the discharge of foam. The first ratio region 307 and the second ratio region 305 achieve simple area division (i.e., a 3% foam ratio and a 6% foam ratio), allowing the vehicle-mounted electric foam proportioning mixer to operate in different mixing ratio modes, thereby solving the problem of a single mixing ratio in manual mixers.

[0030] The first proportional region 307 and the second proportional region 305 each include five flow gears 304 , which are used to output foam liquid flow values ​​corresponding to mixed liquid flow rates of 8 L / s, 16 L / s, 24 L / s, 32 L / s, and 48 L / s, respectively.

[0031] The closing position 306 is located between the first proportional region 307 and the second proportional region 305 for easy operation.

[0032] The cleaning switch 301 is connected to the electric valve 102 through the control line 109. The control line 109 adopts a three-wire system, namely the positive pole of the power supply, the negative pole of the power supply and the signal line, which connects the control signal of the control unit with the electric valve 102, thereby maximizing the system reliability and wire utilization.

[0033] Control module 103 also includes a cleaning indicator light 302, which is electrically connected to cleaning switch 301 and illuminates when cleaning switch 301 is turned on, indicating that cleaning is in progress. Upon receiving a cleaning command, control module 103 outputs a signal to illuminate cleaning indicator 302 and also a signal to automatically open electric valve 102 to its maximum angle, thoroughly purging any residual foam liquid from the system.

[0034] like Figure 2As shown, the voltage stabilizing unit 201 in the control unit adopts a K series high-precision voltage stabilizer to stabilize the vehicle voltage at DC12V. The voltage divider circuit composed of precision wire-wound potentiometers performs precise voltage division (a total of 10 channels), and then is selected as needed by the selection unit 202 in the control unit and output to the output unit 203. In this process, the selection unit 202 records the data calibrated by the standard test bench (for example, the driving voltage value of the opening angle of the electric valve 102 corresponding to the speed and pressure under different water flow rates) as the original data, and accurately divides the control voltage of the electric valve 102 with different mixing ratios of two channels, different flow rates of ten channels, and different openings of the electric valve 102 under different models of fire pumps to obtain a driving signal. The output unit 203 is driven by the driving unit 205. The output unit 203 corresponds to the adjustment switch and is connected to the cleaning unit 204 in the control unit. It can realize the action of the cleaning switch 301, and finally realize the closing or opening of the electric valve 102 at different openings. Specific embodiments

[0036] The mixing ratio of water and foam output by the fire pump is determined by the water flow, foam ratio and foam flow. Strictly controlling the above three values ​​in a foam system can ensure that the mixing ratio of water and foam output by the fire pump meets national standards.

[0037] The performance of the vehicle-mounted electric foam proportioner in this embodiment was tested by establishing an experimental platform for testing fire pump performance and calibrating foam mixing ratios. The experimental platform includes high-precision instruments (accuracy of 2‰) such as water and foam electromagnetic flowmeters, a tachometer, and a pressure gauge, along with appropriate power and piping. Tables 1 and 2 below detail the methods and procedures for calibrating the electric foam proportioner.

[0038] Table 1 Foam ratio is 6%

[0039]

[0040] Table 2 Foam ratio is 3%

[0041]

[0042] Trial options:

[0043] (1) Selection of foam ratio: The fire department recommends that for Class B foam, a ratio of 6% or 3% be used during fire extinguishing. In the test calibration, these two ratios are selected as test points for practicality;

[0044] (2) For small-tonnage fire trucks, it is generally recommended to install fire pumps ranging from CB10 / 30 to CB10 / 50, and set the water flow calibration range to the flow range of 30, 40, and 50 fire pumps, which is scientific and practical;

[0045] (3) The selection of water flow rate (L / s) is based on the calibration point of multiples of 8. This is mainly based on the fact that small-tonnage fire trucks are maneuverable and flexible. In the process of fire fighting, water hose interfaces are generally used to use foam guns for fire fighting operations. The national standard stipulates that the flow rate of foam guns is 8L / s or 16L / s. This selection is to avoid considering the water flow rate when using foam guns for fire fighting: as long as the number of foam guns to be used is selected, the corresponding water flow rate can be conveniently selected. The selected water flow rate is precisely calibrated, ensuring the accuracy of the foam mixing ratio in the actual fire fighting process, improving the efficiency and accuracy of the entire system, and being operable and practical.

[0046] (4) Calculate the foam flow rate under the selected water flow rate according to the foam ratio and list it in the table to prepare for the next calibration;

[0047] (5) The design of the pump speed (r / min) and pump outlet pressure (MPa) is to solve the problem of using fire cannons to extinguish fires in special circumstances. In order to accurately know the water flow value when using fire cannons to extinguish fires, we record the fire pump speed and outlet pressure corresponding to different water flow points during testing and calibration, and write them into the product manual so that users can choose the correct water flow value during actual operation;

[0048] Test calibration method

[0049] During calibration, by adjusting the speed of the fire pump and the valve opening on the test bench, the water flow value is made to be 8L / s in the table. At this time, a precision adjustable wirewound potentiometer is used, with one end connected to a stable DC12V voltage, one end to the negative pole of the power supply, and the middle end to the signal port of the electric valve 102. While adjusting the potentiometer (that is, adjusting the valve opening), observe the reading of the standard foam flowmeter on the test bench. When the foam flowmeter reading reaches 0.24L / s, record the voltage value Va (using a 3 and 1 / 2 precision digital voltmeter) and the valve opening reading aaa% (provided in the electric control valve). This important data is for establishing a database for use in subsequent production processes. Then observe the pressure gauge and tachometer on the test bench and record them.

[0050] By testing and calibrating all the water flow points and different foam ratios in the table, we can obtain important first-hand data of the entire system and lay the foundation for producing qualified products.

[0051] According to the recorded data, set the various values ​​of the control unit, connect the digital multimeter to the signal end of the control line 109, adjust the precision multi-turn potentiometer on the circuit board so that the output voltage is consistent with the experimental calibration data, and set the contents corresponding to the flow gear 304, the first proportional area 307 and the second proportional area 305 on the control panel to achieve the adjustment of the opening of the electric valve 102 to meet different foam ratio requirements. The whole process is very simple.

[0052] The vehicle-mounted electric foam proportioner, configured as described above, was placed on a test bench. First, a foam gun verification test was conducted. Two 8L / s PQ8 foam guns were connected to the system. Selector knob 303 was set to a flow rate of 16L / s. The foam flow meter reading was 0.98L / s, with an error of 0.02L / s, exceeding the national standard. (The verification results were essentially consistent at a 3% ratio.) Verification was conducted at various ratios and flow rates, and the error ranged from 0.5% to 0.2%, fully meeting the requirements.

[0053] Carry out the fire monitor spray experiment, adjust the fire pump speed and outlet pressure value corresponding to the 32L / s water flow point on the test bench, select the flow value 32L / s by selecting the button, observe the standard water flow, and the foam flow meter reading is 1.06L / s, with an error of 0.1, which fully meets the requirements.

[0054] This embodiment establishes a standard test bench and establishes a database of this embodiment through numerous experiments to verify the feasibility of the design concept. It eliminates the need for sensors, controllers, and a large amount of manual programming in the automatic foam proportion mixing system, making this embodiment simpler and more practical. At the same time, it fully utilizes the flexibility and maneuverability of small-tonnage fire trucks and relevant national standards to calibrate the fire pump, foam ratio, and water flow points in a simple and scientific manner, making this embodiment scientific, advanced, and practical.

[0055] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A vehicle-mounted electric foam proportioning mixer, characterized in that: It includes a control module, a mixing tube and an electric valve. The mixing tube is provided with a pressure water inlet for introducing pressure water and a foam liquid inlet for introducing foam liquid. The electric valve is installed at the foam liquid inlet. The electric valve is used to control the amount of foam liquid introduced into the mixing tube. The mixing tube is also provided with a mixed liquid outlet for discharging a mixture of pressure water and foam liquid. The control module is electrically connected to the electric valve and controls the electric valve to open at different opening degrees.

2. The vehicle-mounted electric foam proportioner according to claim 1, characterized in that: The mixing tube is a Venturi tube.

3. The vehicle-mounted electric foam proportioner according to claim 1, characterized in that: The electric valve is provided with a liquid inlet and a liquid outlet, the liquid inlet is used to introduce foam liquid, and the liquid outlet is connected to and communicated with the foam liquid inlet.

4. The vehicle-mounted electric foam proportioner according to claim 1, characterized in that: The control module includes a control unit, a cleaning switch and an adjusting switch. The cleaning switch and the adjusting switch are both electrically connected to the control unit, and the control unit is also electrically connected to the electric valve. When the cleaning switch is turned on and the adjusting switch is closed, the control unit controls the electric valve to fully open. When the cleaning switch is turned off and the adjusting switch is adjusted to different gears, the control unit controls the electric valve to open with different opening degrees.

5. The vehicle-mounted electric foam proportioner according to claim 4, characterized in that: The regulating switch includes a selection knob, a first proportional area, a second proportional area and a closing gear. The selection knob is electrically connected to the control unit. When the selection knob is rotated to point to the first proportional area, the control unit controls the electric valve to operate according to a foam ratio of 3%. When the selection knob is rotated to point to the second proportional area, the control unit controls the electric valve to operate according to a foam ratio of 6%. When the selection knob is rotated to point to the closing gear, the control unit controls the electric valve to close.

6. The vehicle-mounted electric foam proportioner according to claim 5, characterized in that: The first proportional region and the second proportional region each include five flow gears, and the five flow gears are used to output foam liquid flow values ​​corresponding to the mixed liquid of 8 L / s, 16 L / s, 24 L / s, 32 L / s and 48 L / s respectively.

7. The vehicle-mounted electric foam proportioner according to claim 5, characterized in that: The closing position is located between the first proportional range and the second proportional range.

8. The vehicle-mounted electric foam proportioner according to claim 4, characterized in that: The cleaning switch is connected to the electric valve via a control line.

9. The vehicle-mounted electric foam proportioner according to claim 4, characterized in that: The control module further includes a cleaning indicator light, which is electrically connected to the cleaning switch and can light up when the cleaning switch is turned on.

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