A test method for performance testing of high flow compressed air foam systems

Abstract

The application discloses a test method for performance test of a large-flow compressed air foam system in the technical field of compressed air foam, and aims to solve the problem that performance test of a compressed air foam system can only be attached to a fire vehicle for test in the prior art, and that test work is subject to external constraints. The test method comprises the following steps: obtaining test values of a standard mixed proportion of foam liquid; obtaining foam; obtaining liquid separated from the foam, and calculating a foam expansion ratio and a liquid separation time; obtaining actual values of a mixed proportion of the foam; judging whether an air mixing device and a fire monitor meet requirements; judging whether system performance parameters are qualified, and adjusting a working state of the system; and the application is suitable for performance test of a compressed air foam system, and can complete the work of obtaining foam by simulating a vehicle-mounted working condition, so that performance test of the compressed air foam system can be independently operated, and is no longer attached to a fire vehicle, and the practicability of the device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a test method for performance test of large-flow compressed air foam system, belonging to the technical field of compressed air foam. BACKGROUND

[0002] The large-flow compressed air foam system mainly studies whether the foam formed by the foam and water mixture injected into a certain proportion of air in the fire fighting pipeline can meet the requirements of the national standard for the foaming multiple, liquid separation time and other foam states of the low multiple foam system, and can form more uniform and stable foam. The compressed air foam system was first developed and produced in Europe and the United States in the 1980s and 1990s, and began to be popularized and applied in the 1990s and was included in the American Fire Association Standard-NFPA standard. The initial research goal is to extinguish class A fire, and the fire extinguishing efficiency is 20 times that of pure water, and the water saving is more than 90%. With the progress of foam liquid technology, it is also gradually applied to class B fire fighting. The performance of the compressed air foam system needs to be detected before use.

[0003] The existing performance test of the compressed air foam system can usually only be tested by attaching to the fire fighting vehicle, and the test work is restricted by external conditions, cannot be independently operated, and affects the practicability of the device. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art, provide a test method for performance test of large-flow compressed air foam system, and solve the problem that the performance test of the compressed air foam system can usually only be tested by attaching to the fire fighting vehicle, and the test work is restricted by external conditions, cannot be independently operated.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] The present application provides a test method for performance test of large-flow compressed air foam system, characterized in that the method comprises:

[0007] Step A: obtaining the test value of the standard mixing proportion of the foam liquid;

[0008] Step B: running the large-flow compressed air foam system to obtain the foam;

[0009] Step C: obtaining the liquid separated from the foam according to the obtained foam, and calculating the foaming multiple and the liquid separation time of the foam;

[0010] Step D: obtaining the actual value of the mixing proportion of the foam according to the liquid separated from the foam and the test value of the standard mixing proportion of the foam liquid;

[0011] Step E: judging whether the system performance parameters are qualified according to the actual value of the foam mixing ratio, the foam expansion ratio and the liquid separation time, and adjusting the working state of the large-flow compressed air foam system according to the judgment result;

[0012] The operation of the large-flow compressed air foam system to obtain the foam includes:

[0013] The large-flow compressed air foam system test element is assembled, the large-flow compressed air foam system test element includes a fire pump, a foam pump and an air compressor; the test preparation is completed; the motor is started to drive the fire pump to input the pressure water into the fire pump outlet pipe; the power station is started to drive the foam pump to inject the foam liquid into the fire pump inlet pipe to form the water and foam mixture; the engine is started to drive the air compressor to inject the air into the water and foam mixture in the fire pump outlet pipe; the foam gun is started to spray the foam; and the foam bucket is used to collect the foam.

[0014] Further, according to the obtained foam, the liquid separated from the foam is obtained, and the foam expansion ratio and the liquid separation time are calculated.

[0015] The volume and weight of the foam bucket after collecting the foam are obtained.

[0016] According to the volume and weight of the foam bucket after collecting the foam, the foam expansion ratio is calculated.

[0017] The liquid separation time is the time required for the proportion of the liquid separated from the foam to reach the preset value.

[0018] Further, according to the liquid separated from the foam and the test value of the standard mixing ratio of the foam liquid, the actual value of the foam mixing ratio is obtained.

[0019] The refractive index of the liquid separated from the foam is obtained.

[0020] The refractive index of the liquid separated from the foam is compared with the test value of the standard mixing ratio of the foam liquid to obtain the actual value of the foam mixing ratio.

[0021] Further, according to the actual value of the foam mixing ratio, the foam expansion ratio and the liquid separation time, whether the system performance parameters are qualified is judged.

[0022] If the actual value of the foam mixing ratio is within the preset error range, the foam expansion ratio is not less than the preset ratio, and the liquid separation time is not less than the preset time, it is judged that the system performance parameters are qualified.

[0023] Otherwise, it is judged that the system performance parameters are not qualified.

[0024] Further, according to the judgment result, the working state of the large-flow compressed air foam system is adjusted.

[0025] If the system performance parameters are qualified, the work is finished;

[0026] If the system performance parameters are not qualified, the large-flow compressed air foam system is redesigned, and steps B, C, D and E are repeated.

[0027] Further, according to the obtained foam, the liquid separated from the foam is obtained, and the foam expansion ratio and the liquid separation time are calculated.

[0028] According to the obtained foam, the shape of the foam is obtained.

[0029] According to the shape of the foam and the test value of the standard mixing ratio of the foam liquid, the foam forming effect is judged.

[0030] Further, whether the air mixing device and the fire gun spraying state meet the design requirements is further judged.

[0031] The pressure value and the flow value before and after the air mixing device, the fire gun spraying pressure and the foam spraying data are obtained.

[0032] According to the pressure value and the flow value before and after the air mixing device, the fire gun spraying pressure and the foam spraying data, whether the air mixing device and the fire gun spraying state meet the design requirements is judged.

[0033] Compared with the prior art, the beneficial effects achieved by the present application are:

[0034] 1. The test method for testing the performance of the large-flow compressed air foam system, after assembling the test elements of the large-flow compressed air foam system and completing the test preparation, the vehicle-mounted working conditions are simulated by starting the motor, the power station and the engine, the foam is obtained, and the performance test of the compressed air foam system can be independently operated, not dependent on the fire fighting vehicle and not restricted by the outside, thereby ensuring the practicability of the device.

[0035] 2. The foam liquid is injected into the water inlet pipe of the fire pump, so that the injection position of the foam liquid is changed, the working power of the foam pump system is reduced, and the product matching of the later system is simplified.

[0036] 3. The present application can judge whether the air mixing device and the fire gun spraying state meet the design requirements, solve the research difficulty of the large-flow compressed air foam system, and create conditions for the technical breakthrough of the technical difficulties of the system. DETAILED DESCRIPTION

[0037] Figure 1 is a flow chart of a test method for testing the performance of a large-flow compressed air foam system according to an embodiment of the present application;

[0038] Figure 2is a flow chart for obtaining sensor signals of steps B, C, D according to an embodiment of the application;

[0039] Figure 3 is a system schematic diagram of a large-flow compressed air foam system according to an embodiment of the application. DETAILED DESCRIPTION

[0040] The technical solutions of the application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solutions of the application, rather than limitations of the technical solutions of the application. In the case of no conflict, the technical features in the embodiments and the embodiments can be combined with each other.

[0041] The term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0042] As shown in Figures 1-3 The application provides a test method for performance testing of a large-flow compressed air foam system, the method comprising:

[0043] Step A: obtaining test values of a standard mixed proportion of foam liquid;

[0044] Wherein, the standard mixed proportion of foam liquid is tested, and the test values are recorded.

[0045] Step B: running the large-flow compressed air foam system to obtain foam;

[0046] Wherein, the running of the large-flow compressed air foam system to obtain foam comprises:

[0047] Assembling a large-flow compressed air foam system test element, the large-flow compressed air foam system test element comprising a fire pump, a foam pump and an air compressor;

[0048] Completing test preparation, including water tank filling, water hose connection, foam pipe connection, air pipe connection, foam gun connection, connecting various power cables of the test system, and preparing for the test by relevant personnel;

[0049] Starting the motor to drive the fire pump to run, the vacuum pump of the fire pump to draw water, and the fire pump to input pressure water into the fire pump outlet pipe;

[0050] Starting the power station to drive the hydraulic and electric foam pumps to suck foam into the fire pump inlet pipe to form water and foam mixture;

[0051] Start the engine, drive the air compressor to run, inhale air to the set pressure to the water and foam mixture in the fire pump outlet pipe Inject air;

[0052] Start the foam gun or foam cannon to spray foam;

[0053] Use the foam receiving baffle mechanism to receive foam, and different mixed ratio foams are received in the foam receiving barrels.

[0054] In the step of injecting air into the water and foam mixture of the starting engine of the present application, when the flow of the air compressor required by the large flow compressed air foam system is too large, multiple air compressors with smaller rated flow can be used instead of the air compressor required by the system. The multiple smaller air compressors can match the rated pressure and flow of the system to ensure the performance test of the large flow compressed air foam system.

[0055] The present application designs the foaming mechanism between the steps of injecting air into the water and foam mixture and spraying foam for the starting engine, captures the foam flow state by a high-speed camera, finally confirms that the SV type structure and the mixing structure of the static mixer have good mixing effect, and thus confirms the scheme of the foaming mechanism.

[0056] The present application designs the liquid inlet flow guide device of the fire gun head in the step of spraying foam, including the calculation of the length, the spray diameter and the spray length, confirms the establishment of the foam spray pressure and the influence on the spray distance, and thus finally determines the best scheme.

[0057] Step C: obtaining the liquid separated from the foam according to the obtained foam, and calculating the foam expansion ratio and the liquid separation time;

[0058] Among them, according to the obtained foam, the liquid separated from the foam is obtained, and the foam expansion ratio and the liquid separation time are calculated.

[0059] The volume and weight of the foam receiving barrel after receiving the foam are obtained by weighing with an electronic scale combined with the volume of the foam receiving barrel;

[0060] According to the volume and weight of the foam receiving barrel after receiving the foam, the foam expansion ratio is calculated;

[0061] The liquid separation time is the time required for the proportion of the liquid separated from the foam to reach the preset value;

[0062] After obtaining the expansion ratio, the foam liquid will gradually undergo liquid separation reaction, and a stopwatch is used for timing. Optionally, until 25% of the foam in the foam receiving barrel is separated into liquid, the liquid separation time is recorded, wherein 25% is the preset value.

[0063] Among them, it also includes:

[0064] According to the obtained foam, the morphology of the foam is observed by an electron microscope, and the morphology of the foam is obtained by shooting; according to the test value of the standard mixed proportion matching of the foam liquid according to the morphology of the foam, the morphology of the foam is compared and analyzed, and the forming effect of the foam is judged.

[0065] Step D: obtaining the actual value of the mixed proportion of the foam according to the test value of the standard mixed proportion matching of the foam liquid according to the liquid separated from the foam;

[0066] According to the test value of the standard mixed proportion matching of the foam liquid according to the liquid separated from the foam, the actual value of the mixed proportion of the foam is obtained.

[0067] The refractive index of the liquid separated from the foam is tested by an electric proportion tester or an Abbe refractometer, so as to obtain the refractive index of the liquid separated from the foam; wherein the Abbe refractometer is used when the proportion is large, and the electric proportion tester is used when the proportion is small;

[0068] The refractive index of the liquid separated from the foam is compared with the standard proportion value in the test value of the standard mixed proportion matching of the foam liquid, so as to obtain the actual value of the mixed proportion of the foam.

[0069] It also includes judging whether the air mixing device and the fire monitor spraying state meet the design requirements;

[0070] During steps B, C and D, various sensor signals are transmitted to the controller, and the display displays various test parameters and stores them for later analysis, wherein the pressure value and flow value before and after the air mixing device, the fire monitor spraying pressure and the foam spraying data are obtained;

[0071] According to the pressure value and flow value before and after the air mixing device, the fire monitor spraying pressure and the foam spraying data, it is judged whether the air mixing device and the fire monitor spraying state meet the design requirements.

[0072] Step E: according to the actual value of the mixed proportion of the foam, the foam expansion ratio and the liquid separation time, it is judged whether the system performance parameters are qualified, and the working state of the large-flow compressed air foam system is adjusted according to the judgment result.

[0073] According to the actual value of the mixed proportion of the foam, the foam expansion ratio and the liquid separation time, it is judged whether the system performance parameters are qualified.

[0074] If the actual value of the mixed proportion of the foam is within the preset error range, the foam expansion ratio is not less than the preset multiple, and the liquid separation time is not less than the preset time, it is judged that the system performance parameters are qualified; wherein the preset error range, the preset multiple and the preset time can be set according to the actual working condition;

[0075] Otherwise, it is judged that the system performance parameters are unqualified;

[0076] Adjusting the working state of the large-flow compressed air foam system according to the judgment result comprises:

[0077] If the system performance parameters are judged to be qualified, the work is ended, and the system completes the detection;

[0078] If the system performance parameters are judged to be unqualified, the large-flow compressed air foam system is redesigned, the new design elements are replaced, and steps B, C, D and E are repeated.

[0079] The present application injects foam liquid into the water inlet pipe of the fire pump by starting the power station, which is different from the prior art of injecting foam liquid into the water outlet pipe of the fire pump, can greatly reduce the output power of the foam pump, because the outlet pressure of the foam pump is reduced from about 1.0 MPa to-0.1-0.4 MPa, the output power of the foam pump is reduced from 20kW to about 4kW, and at the same time, since the foam liquid is still supplied under positive pressure, the foam mixing ratio will not be affected, and at the same time, it can be verified whether the system can have more technical options when the product is applied, by injecting foam liquid into the water inlet pipe of the fire pump, the foam liquid injection position is changed, so the working power of the foam pump system is reduced, and the product matching of the later system is simplified.

[0080] After assembling the test elements of the large-flow compressed air foam system and completing the test preparation, the present application simulates the vehicle-mounted working condition by starting the motor, power station and engine structure, completes the foam acquisition work, so that the performance test work of the compressed air foam system can be independently operated, is no longer dependent on the fire vehicle, and is no longer subject to external constraints, thereby ensuring the practicability of the device.

[0081] The present application can judge whether the air mixing device and the fire gun injection state meet the design requirements, solve the research difficulty of the large-flow compressed air foam system, and create conditions for technical breakthroughs of various technical difficulties of the system.

[0082] In one embodiment, the large-flow compressed air foam system comprises a foam flow test control system, an air compressor test system and a water pump water supply system, wherein the foam flow test control system is configured with a power station, drives a hydraulic motor, drives two large-flow foam pumps to rotate, and drives a small-flow foam pump by a motor, and the three foam pumps work simultaneously to realize accurate control of the foam flow of the large-flow compressed air foam system under any mixing ratio of the foam liquid.

[0083] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the present application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0084] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0085] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0087] The above description is only preferred embodiments of the application. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made without departing from the technical principles of the application, and these improvements and modifications should also be considered as falling within the scope of the application.

Claims

1. A test method for performance testing of high flow compressed air foam systems, characterized in that, The method comprises: Step A: obtaining test values of the standard mixing proportion of the foam liquid; Step B: running the high-flow compressed air foam system to obtain foam; Step C: obtaining the liquid separated from the foam according to the obtained foam, and calculating the foam expansion ratio and the liquid separation time; Step D: obtaining the actual value of the foam mixing proportion according to the liquid separated from the foam and the test values of the standard mixing proportion of the foam liquid; Step E: judging whether the system performance parameters are qualified according to the actual value of the foam mixing proportion, the foam expansion ratio and the liquid separation time, and adjusting the working state of the high-flow compressed air foam system according to the judgment result; Wherein, the operation of the high-flow compressed air foam system to obtain foam comprises: Assembling the high-flow compressed air foam system test element, which comprises a fire pump, a foam pump and an air compressor; completing the test preparation; starting the motor to drive the fire pump to input pressure water into the fire pump outlet pipe; starting the power station to drive the foam pump to inject foam liquid into the fire pump inlet pipe to form water and foam mixture; starting the engine to drive the air compressor to inject air into the water and foam mixture in the fire pump outlet pipe; starting the foam gun to spray foam; and using the foam bucket to collect foam.

2. A test method for performance testing of a high flow compressed air foam system according to claim 1, characterized in that, According to the obtained foam, the liquid separated from the foam is obtained, and the foam expansion ratio and the liquid separation time are calculated, which comprises: Obtaining the volume and weight of the foam bucket after collecting foam; According to the volume and weight of the foam bucket after collecting foam, the foam expansion ratio is calculated; The liquid separation time is the time required for the proportion of the liquid separated from the foam to reach the preset value.

3. A test method for performance testing of large flow compressed air foam systems according to claim 1, characterized in that, According to the liquid separated from the foam and the test values of the standard mixing proportion of the foam liquid, the actual value of the foam mixing proportion is obtained, which comprises: Obtaining the refractive index of the liquid separated from the foam; Comparing the refractive index of the liquid separated from the foam with the test values of the standard mixing proportion of the foam liquid to obtain the actual value of the foam mixing proportion.

4. A test method for performance testing of large flow compressed air foam systems according to claim 1, characterized in that, According to the actual value of the foam mixing proportion, the foam expansion ratio and the liquid separation time, whether the system performance parameters are qualified comprises: If the actual value of the foam mixing proportion is within the preset error range, the foam expansion ratio is not less than the preset ratio, and the liquid separation time is not less than the preset time, it is judged that the system performance parameters are qualified; Otherwise, it is judged that the system performance parameters are not qualified.

5. A test method for performance testing of large flow compressed air foam systems according to claim 1, characterized in that, According to the judgment result, the working state of the high-flow compressed air foam system is adjusted, which comprises: If the system performance parameters are qualified, the work is finished; If the system performance parameters are not qualified, the high-flow compressed air foam system is redesigned, and steps B, C, D and E are repeated.

6. A test method for performance testing of large flow compressed air foam systems according to claim 1, characterized in that, According to the obtained foam, the liquid separated from the foam is obtained, and the foam expansion ratio and the liquid separation time are calculated, which further comprises: According to the obtained foam, the shape of the foam is obtained; According to the shape of the foam and the test values of the standard mixing proportion of the foam liquid, the foam forming effect is judged.

7. A test method for performance testing of large flow compressed air foam systems according to claim 1, characterized in that, It also comprises judging whether the air mixing device and the fire gun spraying state meet the design requirements: Obtaining the pressure and flow values before and after the air mixing device, the fire gun spraying pressure and the foam spraying data; According to the pressure and flow values before and after the air mixing device, the jetting pressure of the fire monitor and the foam jetting data, it is determined whether the air mixing device and the fire monitor meet the design requirements.

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