Fire protection system assembly and method of foam proportioning control thereof, fire protection equipment

Abstract

The application belongs to the technical field of fire-fighting equipment and provides a fire-fighting system assembly, a foam proportion control method thereof and fire-fighting equipment. The foam proportion control method of the fire-fighting system assembly comprises the following steps: obtaining an actual demand flow of foam; adjusting the rotating speed of a foam pump in a foam supply system so that the difference between the theoretical output flow of the foam pump and the actual demand flow is a positive number and less than a first preset value; and adjusting the opening of a reflux pipeline of the foam supply system until the absolute value of the difference between the actual output flow of the foam supply system and the actual demand flow is less than a second preset value. The rotating speed of the foam pump is first changed to realize coarse adjustment of the output flow of the foam pump, and then the opening of the reflux pipeline is changed to realize fine adjustment of the output flow of the foam pump in a small range. Through the cooperation of coarse adjustment and fine adjustment, the foam output can be accurately adjusted to a suitable proportion in a short time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fire-fighting equipment, and particularly relates to a fire-fighting system assembly, a foam proportion control method thereof and fire-fighting equipment. BACKGROUND

[0002] For a fire-fighting vehicle fire extinguishing system, doping a proper proportion of foam in the sprayed fire water can quickly control the fire and prevent the spread of the fire, effectively improving the fire extinguishing efficiency.

[0003] The existing fire-fighting vehicle fire extinguishing system generally relies on the high-speed flow of fire water in the pipe through a Venturi tube to generate negative pressure, thereby sucking the foam in the foam tank into the water for mixing, and finally spraying together. However, when the fire-fighting vehicle is extinguishing the fire, the output flow and flow rate of the water will change according to different actual situations, and when the fire-fighting working condition of the fire-fighting vehicle changes, it is difficult for this type of foam supply method to accurately control the output proportion of the foam. SUMMARY

[0004] In view of the above defects or deficiencies, the present application provides a fire-fighting system assembly, a foam proportion control method thereof and fire-fighting equipment, aiming to solve the technical problem that the existing fire-fighting vehicle fire extinguishing system cannot accurately control the output proportion of the foam.

[0005] To achieve the above-mentioned purpose, the present application provides a foam proportion control method of a fire-fighting system assembly, wherein the foam proportion control method of the fire-fighting system assembly comprises:

[0006] S100: obtaining an actual demand flow of the foam;

[0007] S200: adjusting the rotating speed of the foam pump in the foam supply system, so that the difference between the theoretical output flow of the foam pump and the actual demand flow is a positive number and less than a first preset value;

[0008] S300: adjusting the opening degree of the backflow pipeline of the foam supply system until the absolute value of the difference between the actual output flow of the foam supply system and the actual demand flow is less than a second preset value;

[0009] The backflow pipeline is used to guide part of the foam output by the foam pump to the foam storage unit or the inlet of the foam pump.

[0010] In the embodiment of the present application, S100: obtaining the actual demand flow of the foam specifically comprises:

[0011] S110: obtaining the current water output flow of the water pump in the fire water supply system;

[0012] S120: calculating the actual demand flow of the foam according to the current water output flow of the water pump and the expected mixing proportion of the foam and the water.

[0013] In an embodiment of the present invention, S200: Adjusting the rotational speed of the foam pump in the foam supply system so that the difference between the theoretical output flow rate of the foam pump and the actual required flow rate is a positive number and less than a first preset value specifically includes:

[0014] S210: Calculate the required rotational speed of the foam pump corresponding to the actual required flow rate;

[0015] S220: Adjust the operating speed of the foam pump according to the sign of the difference between the current operating speed and the required speed;

[0016] S230: When the difference between the current operating speed of the foam pump and the required speed is positive and less than the preset speed difference, stop adjusting the operating speed of the foam pump.

[0017] In an embodiment of the present invention, the operating speed of the foam pump is positively correlated with the magnitude of the control current of the foam pump. S220: Adjusting the operating speed of the foam pump according to the sign of the difference between the current operating speed and the required speed specifically includes:

[0018] When the difference between the current operating speed and the required speed of the foam pump is positive, and the difference between the current operating speed and the required speed of the foam pump is greater than the preset speed difference, the control current of the foam pump is periodically reduced.

[0019] When the difference between the current operating speed and the required speed of the foam pump is negative, the control current of the foam pump is periodically increased.

[0020] In an embodiment of the present invention, the foam pump is a hydraulically driven pump, and a proportional valve is provided on the drive oil circuit of the hydraulically driven pump. The operating speed of the foam pump is adjusted by periodically increasing or decreasing the opening of the proportional valve.

[0021] When the required speed is less than the maximum rated speed of the foam pump, the formula for calculating the expected adjustment speed of the foam pump in each speed adjustment cycle is as follows:

[0022] = + + ;

[0023] in, The expected adjustment speed for the foam pump; This represents the actual flow rate at the pump outlet. This is the conversion coefficient between the water pump outlet flow rate and the foam pump speed, which can be obtained through experimental data. This refers to the pump outlet pressure. The conversion coefficient between water pump outlet pressure and foam pump speed is obtained through experimental data. This represents the current opening degree of the proportional valve. This is the conversion coefficient between the opening degree of the proportional valve and the speed of the foam pump; This is an adjustment parameter for the gear pump speed increase or decrease corresponding to the current opening degree of the proportional valve.

[0024] In an embodiment of the present invention, when the required rotational speed is greater than or equal to the maximum rated rotational speed of the foam pump, = ; This is the maximum rated speed of the foam pump.

[0025] In an embodiment of the present invention, S300: Adjusting the opening of the return pipe of the foam supply system until the absolute value of the difference between the actual output flow and the actual demand flow of the foam supply system is less than the second preset value specifically includes:

[0026] S310: Obtain the actual output flow rate of foam from the foam supply system to the fire water supply system;

[0027] S320: Adjust the opening of the return pipe according to the sign of the difference between the actual output flow and the actual demand flow of the foam supply system;

[0028] S330: When the absolute value of the difference between the actual output flow rate and the actual demand flow rate of the foam supply system is less than the second preset value, stop adjusting the opening of the return pipeline.

[0029] In an embodiment of the present invention, S320: adjusting the opening of the return pipe according to the sign of the difference between the actual output flow rate and the actual demand flow rate of the foam supply system specifically includes:

[0030] When the difference between the actual output flow and the actual demand flow of the foam supply system is positive and the absolute value of the difference is greater than the second preset value, the control current of the foam pump is periodically reduced.

[0031] When the difference between the actual output flow rate and the actual demand flow rate of the foam supply system is negative and the absolute value of the difference is greater than the second preset value, the control current of the foam pump is periodically increased.

[0032] In an embodiment of the present invention, the formula for calculating the opening adjustment of the return pipe is as follows:

[0033] = ( )

[0034] = )

[0035] This refers to the opening degree of the return pipeline after adjustment in the current adjustment cycle; The opening degree of the return pipeline before the adjustment in the current adjustment cycle; t is the current foam mixture ratio (the product of this parameter and k is the actual output flow rate of the foam supply system); L0 is the desired foam-to-water mixing ratio (the product of this parameter and k is the actual demand flow rate); k is the conversion coefficient of the deviation between the current mixture ratio and the desired mixture ratio to the opening adjustment; t is the opening adjustment value of the adjustment cycle.

[0036] To achieve the above objectives, the present invention also provides a fire protection system assembly, which includes a foam supply system, a fire water supply system, and a controller. The fire water supply system includes a water pump and a fire water output pipeline connected to the outlet of the water pump. The foam supply system includes a foam pump, a foam output pipeline, and a return pipeline. One end of the foam output pipeline is connected to the outlet of the foam pump, and the other end is connected to the fire water output pipeline. One end of the return pipeline is connected to the foam output pipeline, and the other end is connected to the foam storage unit or the inlet of the foam pump. A proportional regulating valve for adjusting the opening degree is provided on the return pipeline. The controller is connected to the foam pump and the proportional regulating valve for control, and the controller is used to execute the method described above.

[0037] To achieve the above objectives, the present invention also provides a fire-fighting device, wherein the fire-fighting device includes the fire-fighting system assembly described above.

[0038] Through the above technical solution, the foam ratio control method for the fire protection system assembly provided by the embodiments of the present invention has the following beneficial effects:

[0039] This method analyzes the actual required flow rate of foam and first adjusts the output flow rate of the foam pump by changing the speed of the foam pump. Then, it adjusts the opening of the return pipe to finely adjust the output flow rate of the foam pump within a small range. By combining coarse and fine adjustments, the foam output can be accurately adjusted to a suitable ratio in a short time.

[0040] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0041] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 This is a general flowchart of the foam ratio control method for the fire protection system assembly according to an embodiment of the present invention;

[0043] Figure 2 This is a detailed flowchart of step S100 of the foam ratio control method for the fire protection system assembly according to an embodiment of the present invention;

[0044] Figure 3This is a detailed flowchart of step S200 of the foam ratio control method for the fire protection system assembly according to an embodiment of the present invention;

[0045] Figure 4 This is a detailed flowchart of step S300 of the foam ratio control method for the fire protection system assembly according to an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the fire protection system assembly connection according to an embodiment of the present invention.

[0047] Explanation of reference numerals in the attached figures

[0048] 1. Foam supply system; 11. Foam pump; 12. Return pipeline; 121. Flow regulating valve; 13. Foam output pipeline; 14. Foam storage unit; 2. Fire water supply system; 21. Water pump; 22. Fire water output pipeline. Detailed Implementation

[0049] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0050] The foam ratio control method of the fire protection system assembly of the present invention is described below with reference to the accompanying drawings.

[0051] The fire protection system assembly of the present invention includes a foam supply system 1 and a fire water supply system 2. When the fire protection system assembly is working, the foam output by the foam supply system 1 supplies foam to the fire water in the fire water supply system 2. After the water and foam are mixed, they are sprayed out from the nozzle to extinguish the fire.

[0052] When facing different fire situations, the flow rate of water sprayed by the fire water supply system 2 will vary, or the expected mixing ratio of foam and water will vary, resulting in different actual flow rates required for foam.

[0053] like Figure 1 and Figure 5 As shown, in order to ensure the mixing ratio of foam and water, the present invention provides a foam ratio control method for a fire protection system assembly, wherein the foam ratio control method for the fire protection system assembly includes:

[0054] S100: Obtain the actual demand flow of the bubble;

[0055] S200: Adjust the rotation speed of foam pump 11 in foam supply system 1 so that the difference between the theoretical output flow rate of foam pump 11 and the actual demand flow rate is positive and less than the first preset value;

[0056] S300: Adjust the opening of the return pipe 12 of the foam supply system 1 until the absolute value of the difference between the actual output flow rate and the actual demand flow rate of the foam supply system 1 is less than the second preset value.

[0057] The return pipe 12 is used to guide the foam output from the foam pump 11 to the foam storage unit 14 or the inlet of the foam pump 11, and the second preset value is less than the first preset value.

[0058] After analyzing the actual required flow rate of foam, the output flow rate of foam from foam pump 11 to fire water supply system 2 needs to be adjusted. Changing the rotation speed of foam pump 11 will significantly alter its output flow rate. This adjustment method, which changes the output flow rate of foam pump 11 by adjusting the rotation speed, can quickly adjust the output flow rate of foam pump 11 to be close to the actual required flow rate. However, this method has low adjustment precision and can only roughly adjust the output flow rate of foam pump 11 to be close to the actual required flow rate. For example, if the actual required flow rate of foam is 80 L / min, adjusting the rotation speed of foam pump 11 can only ensure that its output flow rate is within the range of (80 ± 80 * 3%) L / min.

[0059] After adjusting the theoretical output flow rate of foam pump 11 to be slightly greater than the actual required flow rate, in order to further adjust the foam output flow rate of foam pump 11, this method uses return pipe 12 to return the excess foam output by foam pump 11. The maximum return flow rate of return pipe 12 is much smaller than the output flow rate of foam pump 11. For example, the maximum return flow rate of return pipe 12 can be 10% or lower than the current output flow rate of foam pump 11. By changing the opening degree of return pipe 12, the return flow rate of return pipe 12 can be changed, thereby achieving precise adjustment of the foam flow rate supplied by foam pump 11 to fire water supply system 2 within a small range.

[0060] In summary, this method analyzes the actual required flow rate of foam and first adjusts the output flow rate of foam pump 11 by changing the rotation speed of foam pump 11, and then adjusts the opening of return pipe 12 to finely adjust the output flow rate of foam pump 11 within a small range. Through the combination of coarse and fine adjustment, the foam output can be accurately adjusted to a suitable ratio in a short time.

[0061] Understandably, when the speed of foam pump 11 is adjusted to the appropriate level, the theoretical output flow rate corresponding to the speed of foam pump 11 needs to be slightly greater than the actual required flow rate.

[0062] like Figure 2 and Figure 5 As shown, in an embodiment of the present invention, S100: obtaining the actual required flow rate of the foam specifically includes:

[0063] S110: Obtain the current water flow rate of pump 21 in fire water supply system 2;

[0064] S120: Calculate the actual required flow rate of foam based on the current outlet flow rate of water pump 21 and the desired mixing ratio of foam and water.

[0065] Depending on the fire situation, the current water flow rate of pump 21 will vary. Therefore, when analyzing the actual required flow rate of foam, it is first necessary to obtain the current water flow rate of pump 21 in the fire water supply system 2, and also to know the desired mixing ratio of foam and water. The desired mixing ratio of foam and water can be set manually, such as firefighters inputting a desired mixing ratio of 5% on the central control display screen of the fire equipment. After knowing the current water flow rate of pump 21 and the desired mixing ratio of foam and water, multiplying the two yields the actual required flow rate of foam.

[0066] like Figure 3 and Figure 5 As shown, in an embodiment of the present invention, S200: adjusting the rotational speed of the foam pump 11 in the foam supply system 1 so that the difference between the theoretical output flow rate of the foam pump 11 and the actual required flow rate is a positive number and less than a first preset value specifically includes:

[0067] S210: Calculate the required rotational speed of the foam pump 11 corresponding to the actual required flow rate;

[0068] S220: Adjust the operating speed of foam pump 11 according to the sign of the difference between the current operating speed and the required speed;

[0069] S230: When the difference between the current operating speed of foam pump 11 and the required speed is positive and less than the preset speed difference, stop adjusting the operating speed of foam pump 11.

[0070] There is a corresponding relationship between the theoretical output flow rate of foam pump 11 and its rotational speed, which can be obtained through laboratory testing. After analyzing the actual required flow rate of foam, the corresponding rotational speed of foam pump 11 is found and taken as the required speed. After calculating the required speed of foam pump 11, the speed of foam pump 11 is increased according to the sign of the difference between the current operating speed and the required speed, until the difference between the current operating speed and the required speed is positive and less than the preset speed difference, which indicates that the coarse adjustment of the output flow rate of foam pump 11 is complete.

[0071] The purpose of adjusting the speed of foam pump 11 to be greater than the required speed is to ensure that the theoretical output flow rate corresponding to the speed of foam pump 11 is greater than the actual required flow rate when the speed adjustment of foam pump 11 is completed.

[0072] In embodiments of the present invention, for fire-fighting equipment with its own hydraulic system, the foam pump 11 is preferably a hydraulically driven pump such as a hydraulic gear pump. Hydraulically driven pumps have advantages such as high pump power and small size, and can directly utilize the hydraulic system on the fire-fighting equipment, making power extraction convenient. Of course, the foam pump 11 can also be an electric motor driven pump. For electric motor driven pumps, a separate power supply needs to be provided on the fire-fighting equipment, and the motor needs to be waterproofed during installation.

[0073] In embodiments of the present invention, the foam pump 11 can also draw power directly from the engine. However, this type of drive method makes it difficult to adjust the speed of the foam pump 11.

[0074] Taking foam pump 11 as an example of a hydraulically driven pump, a proportional valve is installed in the drive oil circuit of the hydraulically driven pump. The opening degree of the proportional valve is positively correlated with the rotational speed of foam pump 11. The operating speed of foam pump 11 is adjusted by periodically increasing or decreasing the rotational speed of foam pump 11.

[0075] When the required speed is less than the maximum rated speed of the foam pump 11, the formula for calculating the expected adjustment speed of the foam pump 11 in each speed adjustment cycle is as follows:

[0076] = + + ;

[0077] The expected adjustment speed for foam pump 11; This represents the actual flow rate at the outlet of water pump 21. The conversion coefficient between the outlet flow rate of water pump 21 and the speed of foam pump 11 can be obtained through experimental data. This refers to the outlet pressure of water pump 21. The conversion coefficient between the outlet pressure of water pump 21 and the speed of foam pump 11 is obtained through experimental data. This represents the current opening degree of the proportional valve. The conversion coefficient between the opening degree of the proportional valve and the speed of the foam pump 11; This is an adjustment parameter for the gear pump speed increase or decrease corresponding to the current opening degree of the proportional valve.

[0078] ( The rotational speed required for foam pump 11 to pump foam into the fire-fighting water outlet of pump 21 at the current flow rate is ( ). The rotational speed required for foam pump 11 to pressurize foam into the fire-fighting water outlet of pump 21 at the current pressure is ( ). This characterizes the theoretical rotational speed corresponding to the current opening degree of the proportional valve. This represents the increase or decrease in speed during the current speed adjustment cycle. The greater the difference between the theoretical speed corresponding to the current opening degree of the proportional valve and the required speed, the greater the increase or decrease in speed during the current speed adjustment cycle. The magnitude of the increase or decrease in speed during each speed adjustment cycle is determined by parameters... Adjustment, that is Based on the difference between the theoretical speed and the required speed, which is constantly changing, this adjustment method allows the speed of the foam pump to be adjusted to be close to the required speed more quickly.

[0079] It should be noted that periodically increasing or decreasing the speed of foam pump 11 refers to calculating the expected adjustment speed according to the above formula every preset time interval (e.g., every 100ms), then coarsely adjusting the speed of foam pump 11 to be close to the expected adjustment speed, repeating this process multiple times until the difference between the current operating speed of foam pump 11 and the required speed is positive and less than the preset speed difference. By periodically increasing or decreasing the speed of foam pump 11, closed-loop control of the speed of foam pump 11 can be formed, avoiding hysteresis or delay in the control of foam pump 11.

[0080] In an embodiment of the present invention, when the required rotational speed is greater than or equal to the maximum rated rotational speed of the foam pump 11, = ; This is the maximum rated speed of foam pump 11.

[0081] In embodiments of the present invention, for hydraulically driven pumps or motor-driven pumps, their operating speed can be achieved by changing the magnitude of the control current of the proportional valve on the foam pump 11 or the drive oil circuit.

[0082] In an embodiment of the present invention, S220: adjusting the operating speed of the foam pump 11 according to the sign of the difference between the current operating speed and the required operating speed specifically includes:

[0083] When the difference between the current operating speed and the required speed of the foam pump 11 is positive, and the difference between the current operating speed and the required speed of the foam pump 11 is greater than the preset speed difference, the control current of the foam pump 11 is periodically reduced.

[0084] When the difference between the current operating speed and the required speed of the foam pump 11 is negative, the control current of the foam pump 11 is periodically increased.

[0085] Periodically decreasing or increasing the control current of foam pump 11 means that the value of the control current increases by d at preset intervals (e.g., 100ms). The control formula can be expressed as A=A0±kt. The value of d that increases the control current each time can be the same or different. The result after each adjustment is used as a comparison input with the required speed, thereby accurately adjusting the speed of the gear pump to be close to the required speed.

[0086] It is understood that the foam ratio control method of the present invention can be dynamically adjusted according to changes in the current outflow rate of water pump 21. During firefighting operations, firefighters sometimes adjust the current outflow rate of water pump 21 according to the situation on site. When a change in the current outflow rate of water pump 21 is detected, the system will recalculate the actual required flow rate of foam and the required speed of foam pump 11. If the flow rates of foam and water have reached equilibrium, and firefighters change the outflow rate of the water pump, the output flow rate of foam needs to be readjusted. When the difference between the current operating speed of foam pump 11 and the required speed is greater than the preset speed difference, it means that the current foam output flow rate of foam pump 11 is too high, and the mixing ratio of foam and water is significantly different from the expectation. At this time, the control current of foam pump 11 can be periodically reduced to quickly reduce the speed and output flow rate of foam pump 11, and then the opening of return pipe 12 can be adjusted for fine-tuning.

[0087] like Figure 4 and Figure 5 As shown, in an embodiment of the present invention, S300: Adjusting the opening of the return pipe 12 of the foam supply system 1 until the absolute value of the difference between the actual output flow and the actual demand flow of the foam supply system 1 is less than the second preset value specifically includes:

[0088] S310: Obtain the actual output flow rate of foam supplied from foam supply system 1 to fire water supply system 2;

[0089] S320: Adjust the opening of the return pipe 12 according to the sign of the difference between the actual output flow and the actual demand flow of the foam supply system 1;

[0090] S330: When the absolute value of the difference between the actual output flow rate and the actual demand flow rate of the foam supply system 1 is less than the second preset value, stop adjusting the opening of the return pipe 12.

[0091] When the theoretical output flow rate of foam pump 11 is adjusted to be greater than the actual required flow rate, the return pipe 12 may be in a conductive state, resulting in the actual output flow rate of foam pump 11 to fire water supply system 2 potentially being less than or greater than the actual required flow rate. In this case, the opening of the return pipe 12 needs to be adjusted according to the sign of the difference between the actual output flow rate and the actual required flow rate of foam supply system 1. By constraining the absolute value of the difference between the actual output flow rate and the actual required flow rate of foam supply system 1 within a second preset value, the actual mixing ratio of the foam-water mixture can be guaranteed to be within the tolerance threshold of the desired foam-water mixing ratio.

[0092] In an embodiment of the present invention, S320: adjusting the opening of the return pipe 12 according to the difference between the actual output flow rate and the actual demand flow rate of the foam supply system 1 includes:

[0093] When the difference between the actual output flow and the actual demand flow of the foam supply system 1 is positive and the absolute value of the difference is greater than the second preset value, the control current of the foam pump 11 is periodically reduced.

[0094] When the difference between the actual output flow and the actual demand flow of the foam supply system 1 is negative and the absolute value of the difference is greater than the second preset value, the control current of the foam pump 11 is periodically increased.

[0095] Specifically, in an embodiment of the present invention, the formula for calculating the opening adjustment of the return pipe 12 is as follows:

[0096] = ( )

[0097] = )

[0098] The opening degree of the return pipe 12 after adjustment in the current adjustment cycle; The opening degree of the return pipe 12 before the adjustment in the current adjustment cycle; t is the current foam mixture ratio (the product of this parameter and k is the actual output flow rate of foam supply system 1); L0 is the desired foam-water mixing ratio (the product of this parameter and k is the actual demand flow rate); k is the conversion coefficient from the deviation between the current mixture ratio and the desired mixture ratio to the opening adjustment; t is the opening adjustment value of the adjustment cycle; S is the tolerance threshold.

[0099] If the current mixing ratio of foam and water is greater than the expected mixing ratio of foam and water ( This indicates that the flow rate of foam pump 11 supplying foam to fire water supply system 2 is excessive, requiring an increase in the opening of return pipe 12 to reduce the flow rate of foam pump 11 supplying foam to fire water supply system 2. When increasing the opening of return pipe 12, similar to the speed adjustment of foam pump 11, the opening of return pipe 12 can be increased periodically (e.g., by t every 100ms). By periodically increasing or decreasing the control current of foam pump 11, feedback adjustment and closed-loop control of the opening of return pipe 12 can be achieved. Similarly, if the current foam-water mixing ratio is greater than the desired foam-to-water mixing ratio (…), the flow rate of foam pump 11 supplying foam to fire water supply system 2 is also excessive. If so, the opening of the return pipe 12 will be reduced periodically.

[0100] In an embodiment of the present invention, before starting the foam pump 11, a start-up condition judgment is required to ensure the safe operation of the equipment. The start-up conditions may include whether the fire-fighting equipment is in a folded or operational state, whether the water pump 21 has already started, and whether the foam liquid in the foam tank is sufficient. These start-up conditions can be adjusted according to the structural characteristics of the fire-fighting equipment itself.

[0101] like Figure 5 As shown, to achieve the above objectives, the present invention also provides a fire protection system assembly, which includes a foam supply system 1, a fire water supply system 2, and a controller. The fire water supply system 2 includes a water pump 21 and a fire water output pipeline 22 connected to the outlet of the water pump 21. The foam supply system 1 includes a foam pump 11, a foam output pipeline 13, and a return pipeline 12. One end of the foam output pipeline 13 is connected to the outlet of the foam pump 11, and the other end is connected to the fire water output pipeline 22. One end of the return pipeline 12 is connected to the foam output pipeline 13, and the other end is connected to the foam storage unit 14 or the inlet of the foam pump 11. A proportional regulating valve for adjusting the opening degree is provided on the return pipeline 12. The controller is connected to the foam pump 11 and the proportional regulating valve for control. The controller is used to execute the method described above, and the controller is also used for data acquisition, calculation, and control of each valve.

[0102] like Figure 5 As shown, in an embodiment of the present invention, by connecting the foam output pipeline 13 to the fire water output pipeline 22, corrosion of the water pump 21 caused by foam passing through it can be avoided, thus extending the service life of the water pump 21. Simultaneously, using the foam pump 11 to independently supply foam can prevent a decrease in the outlet pressure of the water pump 21, thereby increasing the spray distance of the fire water.

[0103] like Figure 5 As shown, in an embodiment of the present invention, the foam supply system 1 further includes a pressure relief valve connected in parallel with the foam pump 11 pipeline. The pressure relief valve is used to safely relieve pressure when the outlet pressure of the foam pump 11 is too high.

[0104] likeFigure 5 As shown, in an embodiment of the present invention, a foam flow meter and a foam pressure meter are also provided on the foam output pipeline 13. The foam flow meter and the foam pressure meter are used to detect the flow rate and pressure of the foam pump 11 supplying the fire water supply system 2.

[0105] In an embodiment of the present invention, a water flow meter and a water pressure meter are provided on the fire water output pipeline 22. The water flow meter and the water pressure meter are used to detect the pressure and flow rate of the water at the outlet of the water pump 21.

[0106] To achieve the above objectives, the present invention also provides a fire-fighting device, wherein the fire-fighting device includes the fire-fighting system assembly described above. The fire-fighting device may be a fire truck. Since the fire-fighting device adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought about by the above embodiments, and will not be repeated here.

[0107] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0108] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although embodiments of the present invention have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for controlling the foam ratio in a fire protection system assembly, characterized in that, The foam ratio control method for the fire protection system assembly includes: Obtain the actual demand flow of the bubble; Adjust the rotation speed of the foam pump (11) in the foam supply system (1) so that the difference between the theoretical output flow rate of the foam pump (11) and the actual demand flow rate is positive and less than the first preset value; Adjust the opening of the return pipe (12) of the foam supply system (1) until the absolute value of the difference between the actual output flow rate of the foam supply system (1) and the actual demand flow rate is less than the second preset value. Adjusting the rotational speed of the foam pump (11) in the foam supply system (1) so that the difference between the theoretical output flow rate of the foam pump (11) and the actual demand flow rate is positive and less than a first preset value specifically includes: Calculate the required rotational speed of the foam pump (11) corresponding to the actual required flow rate; The operating speed of the foam pump (11) is increased or decreased according to the sign of the difference between the current operating speed of the foam pump (11) and the required operating speed; When the difference between the current operating speed of the foam pump (11) and the required speed is positive and the difference is less than the preset speed difference, the adjustment of the operating speed of the foam pump (11) is stopped. Adjusting the opening of the return pipe (12) of the foam supply system (1) until the absolute value of the difference between the actual output flow and the actual demand flow of the foam supply system (1) is less than the second preset value specifically includes: Obtain the actual output flow rate of the foam supplied by the foam supply system (1) to the fire water supply system (2); The opening of the return pipe (12) is adjusted according to the difference between the actual output flow rate of the foam supply system (1) and the actual demand flow rate. When the absolute value of the difference between the actual output flow rate of the foam supply system (1) and the actual demand flow rate is less than the second preset value, the adjustment of the opening degree of the return pipeline (12) is stopped. The return pipeline (12) is used to guide the foam output from the foam pump (11) to the foam storage unit (14) or the inlet of the foam pump (11).

2. The foam ratio control method for the fire protection system assembly according to claim 1, characterized in that, The actual demand for acquiring bubble flow specifically includes: Obtain the current outflow rate of the water pump (21) in the fire water supply system (2); The actual required flow rate of the foam is calculated based on the current outlet flow rate of the water pump (21) and the desired mixing ratio of foam and water.

3. The foam ratio control method for the fire protection system assembly according to claim 1, characterized in that, The foam pump (11) is a hydraulically driven pump. A proportional valve is provided on the drive oil circuit of the hydraulically driven pump. The operating speed of the foam pump (11) is adjusted by periodically increasing or decreasing the operating speed of the foam pump (11). When the required rotational speed is less than the maximum rated rotational speed of the foam pump (11), the calculation formula for the expected adjustment rotational speed of the foam pump (11) in each rotational speed adjustment cycle is as follows: = + + ； in, The expected adjustment speed of the foam pump (11); The actual flow rate at the outlet of the water pump (21); The conversion coefficient between the outlet flow rate of the water pump (21) and the speed of the foam pump (11) can be obtained through experimental data. For the outlet pressure of the water pump (21); The conversion coefficient between the outlet pressure of the water pump (21) and the speed of the foam pump (11) is obtained through experimental data. This represents the current opening degree of the proportional valve. The conversion coefficient between the opening degree of the proportional valve and the speed of the foam pump (11); This is an adjustment parameter for the gear pump speed increase or decrease corresponding to the current opening degree of the proportional valve.

4. The foam ratio control method for the fire protection system assembly according to claim 1, characterized in that, The operating speed of the foam pump (11) is positively correlated with the magnitude of the control current of the foam pump (11). Adjusting the operating speed of the foam pump (11) based on the sign of the difference between its current operating speed and the required operating speed specifically includes: When the difference between the current operating speed of the foam pump (11) and the required speed is positive, and the difference between the current operating speed of the foam pump (11) and the required speed is greater than the preset speed difference, the control current of the foam pump (11) is periodically reduced. When the difference between the current operating speed of the foam pump (11) and the required speed is negative, the control current of the foam pump (11) is periodically increased.

5. The foam ratio control method for the fire protection system assembly according to claim 4, characterized in that, Based on the sign of the difference between the actual output flow rate of the foam supply system (1) and the actual demand flow rate, the opening degree of the return pipeline (12) is adjusted accordingly, specifically including: When the difference between the actual output flow rate of the foam supply system (1) and the actual demand flow rate is positive and the absolute value of the difference is greater than the second preset value, the control current of the foam pump (11) is periodically reduced. When the difference between the actual output flow rate of the foam supply system (1) and the actual demand flow rate is negative and the absolute value of the difference is greater than the second preset value, the control current of the foam pump (11) is periodically increased.

6. The foam ratio control method for the fire protection system assembly according to claim 5, characterized in that, The formula for calculating the opening adjustment of the return pipe (12) is as follows: = （ ）; = ）; The opening degree of the return pipe (12) after adjustment in the current adjustment cycle; The opening degree of the return pipe (12) before the adjustment in the current adjustment cycle; L0 is the current foam mixture ratio (the product of this parameter and k is the actual output flow rate of the foam supply system (1)); L0 is the desired foam-water mixing ratio (the product of this parameter and k is the actual demand flow rate); k is the conversion coefficient of the deviation between the current mixture ratio and the desired mixture ratio to the opening adjustment; t is the opening adjustment value of the adjustment cycle.

7. A fire protection system assembly, characterized in that, include: The fire water supply system (2) includes a water pump (21) and a fire water output pipeline (22) connected to the outlet of the water pump (21). A foam supply system (1) includes a foam pump (11), a foam output pipeline (13), and a return pipeline (12). One end of the foam output pipeline (13) is connected to the outlet of the foam pump (11), and the other end is connected to the fire water output pipeline (22). One end of the return pipeline (12) is connected to the foam output pipeline (13), and the other end is connected to the foam storage unit (14) or the inlet of the foam pump (11). The return pipeline (12) is equipped with a proportional regulating valve for adjusting the opening degree. A controller, connected to the foam pump (11) and the proportional control valve, is used to perform the method according to any one of claims 1 to 6.

8. A fire-fighting device, characterized in that, The fire-fighting equipment includes the fire-fighting system assembly according to claim 7.

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