Nuclear grade high efficiency particle air filter filtration performance test bench

The utility model provides a nuclear-grade high-efficiency particle air filter filtration performance test bench. The air inlet of the tested filter is sequentially connected to a class 100 clean room, a high-efficiency filter, a blower, a medium-efficiency filter, and a coarse-efficiency filter; The air inlet of the tested filter is also connected with a multi-phase dust generator; the front and rear ends of the air pipe of the tested filter are respectively equipped with upstream and downstream sampling pipes; the front and rear ends of the air pipe of the tested filter are also placed The pressure gauge is installed; the back end of the air pipe of the tested filter is equipped with an air flow measuring instrument; the air outlet of the tested filter is connected to an exhaust fan; the middle of the tested filter is placed with a nozzle. The utility model adopts a double fan system to ensure that the test air duct is slightly positive pressure, and the outside air will not penetrate into the test air duct; the test air passes through a coarse, medium and high-efficiency three-stage filter to form an air source with a cleanliness of one hundred. The test process is stable and will not be affected by changes in the atmospheric environment. Technical Field: The utility model relates to nuclear-grade high-efficiency particle air filter testing technology, and specifically relates to a nuclear-grade high-efficiency particle air filter filtration performance test bench.　　Background technology: The performance test of the nuclear-grade high-efficiency particulate air filter includes the filter transmittance test. At present, the sodium flame method is commonly used in the domestic test bench for the permeability of nuclear-grade high-efficiency particle air filters. The principle of the sodium flame method is to spray and dry a certain concentration of sodium chloride aqueous solution to form a mass median diameter of about A 0.4 micron sodium chloride aerosol was used as the test dust. Dust-laden air is sampled before and after the tested filter, and led to the sodium flame photometer to measure the photocurrent value related to the dust-laden concentration, so as to calculate the filter efficiency. Most industrialized countries such as Europe, America and Japan generally use the more advanced particle counting method (DOP method) test bench to determine the filtration efficiency of high-efficiency air filters. The particle counting method has the advantages of high sensitivity and various choices of aerosol particle size. It has stricter requirements for filter performance and more accurate test results. Therefore, it is necessary to design a nuclear-grade high-efficiency particle air filter filtration performance test bench based on the particle counting method to detect the filtration performance of the filter. Summary of the invention: The purpose of the present utility model is to provide a nuclear-grade high-efficiency particle air filter filtration performance test bench based on the particle counting method, which is used to detect the filtration performance of the filter. The technical scheme to achieve the purpose of this utility model: a nuclear-grade high-efficiency particle air filter filtration performance test bench, the air inlet of the tested filter is connected to a hundred-class clean room, high-efficiency filter, blower, medium-efficiency filter, Coarse-effect filter, in which the air enters the blower through the coarse-efficiency filter and the medium-efficiency filter in sequence, and is sent to the high-efficiency filter by the blower, and then enters the tested filter; the air inlet of the tested filter is also connected with multi-phase dust generation The front and rear ends of the air pipe of the tested filter are equipped with upstream sampling pipes and downstream sampling pipes respectively; the front and rear ends of the air pipe of the tested filter are also equipped with pressure gauges; the air pipe of the tested filter is set at the back end An air flow measuring instrument; an exhaust fan is connected to the air outlet of the tested filter; a nozzle is placed in the middle of the tested filter. The above-mentioned nuclear-grade high-efficiency particle air filter filtration performance test bench, wherein the 100-grade clean room is equipped with a temperature and humidity measuring instrument. In the above-mentioned nuclear-grade high-efficiency particle air filter filtration performance test bench, the upstream sampling pipe and the downstream sampling pipe are also connected with a laser particle counter for testing. The effect of the utility model is: the nuclear-grade high-efficiency particle air filter filtration performance test bench of the utility model adopts a dual fan system to ensure that the test air duct is slightly positive pressure, and the outside air will not penetrate into the test air Inside the tunnel; the test air passes through the coarse, medium and high-efficiency three-stage filter to form an air source with a cleanliness of 100, so that the test process is stable and will not be affected by changes in the atmospheric environment. On the nuclear-grade high-efficiency particle air filter filtration performance test bench of the present invention, a laser particle counter is used to test the filter under the conditions of rated air volume (1700m3/h) and 20% of rated air volume (340m3/h), Including the test efficiency of 0.1, 0.2, 0.3, 0.5 micron particles, the efficiency of the least efficient particle is used as the efficiency of the filter, and the test result is more accurate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: The filtering performance test bench of a nuclear-grade high-efficiency particle air filter according to the present utility model will be further described below with reference to the drawings and specific embodiments. As shown in Figure 1 and Figure 2, the filter performance test bench of a nuclear-grade high-efficiency particle air filter according to the present invention, the air inlet of the tested filter 9 is connected to the 100-class clean room 5, high-efficiency filter in turn Air filter 4, blower 3, medium-efficiency filter 2, coarse-efficiency filter 1, the air passes through coarse-efficiency filter 1, medium-efficiency filter 2 and enters blower 3 in turn, and is fed into high-efficiency filter 4 by blower 3, and the result is The air with a cleanliness of class 100 enters the tested filter 9 through the class 100 clean room 5. A temperature and humidity measuring instrument 6 is provided on the hundred-class clean room 5.

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