Filtration efficiency detection system and filter cartridge testing method

Abstract

The present invention discloses a filtration efficiency detection system and a filter cartridge testing method. The filtration efficiency detection system includes a housing, a first dust sensor, a second dust sensor, and a pressure differential sensor. A partition is provided in the housing, and the housing is divided into a dust chamber and a clean room by the partition. A mounting port for mounting a filter cartridge is provided on the partition. The clean room is used to communicate with the outlet of the filter cartridge. An air inlet connected to the dust chamber and an air outlet connected to the clean room are provided on the housing. The first dust sensor is used to measure the dust concentration at the air inlet, the second dust sensor is used to measure the dust concentration at the air outlet, and the pressure differential sensor is used to measure the pressure difference between the dust chamber and the clean room. The above-mentioned filtration efficiency detection system can conveniently and quickly measure the filtration efficiency of the filter cartridge. The pressure differential sensor can measure the pressure difference, which is used to monitor the accumulation of dust on the filter cartridge, so as to conveniently remind the staff to remove dust from the filter cartridge or replace the filter cartridge in time to improve the accuracy of the test.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and in particular to a filtration efficiency detection system and a filter cartridge testing method. Background Art

[0002] With the rapid development of environmental protection technologies, the national standards for industrial pollution emissions are becoming increasingly stringent, and air filtration has become a hot topic of public concern. During the emission process, various pollutants in the air, such as particulate matter and nitrogen oxides, can be effectively treated through dust removal systems, reducing air pollution caused by industrial exhaust gases. However, traditional dust removal system efficiency testing is time-consuming and costly, and the tests are not accurate enough to meet the requirements of enterprises for rapid and accurate testing and debugging of dust removal system filter cartridges. Summary of the Invention

[0003] Based on this, the present invention aims to overcome the defects of the prior art and provide a filtration efficiency detection system and a filter cartridge testing method that can quickly and accurately test the dust removal efficiency of a filter cartridge.

[0004] The technical solution is as follows:

[0005] A filtration efficiency detection system, comprising:

[0006] A box body, wherein a partition is provided inside the box body, and the box body is divided into a dust chamber and a clean chamber by the partition body, the partition body is provided with a mounting port for mounting a filter cartridge, the clean chamber is used to communicate with the outlet of the filter cartridge, and the box body is provided with an air inlet communicating with the dust chamber and an air outlet communicating with the clean chamber;

[0007] a first dust sensor, configured to measure dust concentration at the air inlet;

[0008] a second dust sensor, configured to measure dust concentration at the air outlet; and

[0009] A pressure difference sensor is used to measure the pressure difference between the dust chamber and the clean room.

[0010] In the above-mentioned filtration efficiency detection system, the mounting port on the partition can be used to install the filter cartridge. At this time, if dust gas is introduced into the dust chamber through the air inlet, the filtered gas can be discharged into the clean room through the outlet of the filter cartridge and discharged through the air outlet. In the process of the filter cartridge filtering the dust gas, the first dust sensor can measure the dust concentration at the air inlet, and the second dust sensor can measure the dust concentration at the air outlet. That is, the first dust sensor can measure the dust concentration of the dust gas before filtration, and the second dust sensor can measure the dust concentration of the gas after filtration. By comparing the values ​​measured by the first dust sensor and the second dust sensor, the filtration efficiency of the filter cartridge can be understood. The above-mentioned dust filtration system The system can conveniently and quickly measure the filtration efficiency of the filter cartridge for dust gas. At the same time, the differential pressure sensor can measure the pressure difference between the dust room and the clean room. The absolute value of this pressure difference is positively correlated with the dust accumulation on the filter cartridge. When the absolute value of the pressure difference is larger, the more dust accumulates on the filter cartridge, which will cause the filtration of the filter cartridge to decline and affect the test of the filtration efficiency of the filter cartridge. Therefore, by setting the differential pressure sensor, the dust accumulation on the filter cartridge, the initial pressure difference when the filter cartridge is working, and the normal working pressure difference can be monitored. This can facilitate the staff to promptly remove the dust on the filter cartridge or replace the filter cartridge when a lot of dust accumulates on the filter cartridge, so as to ensure that the filtration efficiency of the filter cartridge during normal operation can be measured and the accuracy of the test can be improved.

[0011] In one embodiment, the filtration efficiency detection system further includes a nozzle and a pressure sensor, wherein the nozzle is used to spray pulse gas into the filter cartridge through the outlet of the filter cartridge, and the pressure sensor is arranged in the dust chamber and opposite to the filter paper of the filter cartridge.

[0012] In one embodiment, there are multiple pressure sensors, and the pressure sensors are arranged in sequence along the length direction of the filter cartridge.

[0013] In one embodiment, the filtration efficiency detection system further includes an air jet component and a pulse valve. The air jet component is connected to the nozzle, and the pulse valve is used to control the opening or closing of the nozzle air jet.

[0014] In one embodiment, the filtration efficiency detection system further includes an air intake pipe, a transfer pipe and a discharge valve. The air intake pipe is connected to the air inlet, and both ends of the transfer pipe are respectively connected to the lower end of the dust chamber and the air intake pipe. The discharge valve is provided on the transfer pipe, and the discharge valve is used to transfer dust into the air intake pipe.

[0015] In one embodiment, the above-mentioned filtration efficiency detection system also includes an air outlet pipe, a fan and a feeding piece, the air inlet pipe is connected to the air inlet, the air outlet pipe is connected to the air outlet, a filter is provided at the end of the air inlet pipe, the fan is provided at the end of the air outlet pipe, and the feeding piece is provided on the air inlet pipe and located between the filter and the box.

[0016] In one embodiment, the filtration efficiency detection system further includes an anemometer, which is located in the air outlet pipe and is arranged on a side of the fan away from the box.

[0017] In one embodiment, the clean room is arranged above the dust room, and the lower end of the dust room is in an inverted pyramid shape.

[0018] In one embodiment, the filtration efficiency detection system further includes a processor and a display, wherein the processor is electrically connected to the first dust sensor, the second dust sensor, and the pressure difference sensor, and the display is electrically connected to the processor.

[0019] A filter cartridge testing method, using any of the above-described filtration efficiency detection systems, comprises the following steps:

[0020] Installing the filter cartridge at the installation opening on the partition, wherein the outlet of the filter cartridge is connected to the clean room;

[0021] Filling the dust chamber with dust gas through the air inlet;

[0022] Obtaining the dust concentration t1 measured by the first dust sensor, the dust concentration t2 measured by the second dust sensor, and the pressure difference s of the differential pressure sensor respectively;

[0023] When the pressure difference s is less than a preset maximum value, t1 is compared with t2 to obtain the filtration efficiency of the filter cartridge;

[0024] When the pressure difference s is greater than or equal to the preset maximum value, the filling of dust gas into the dust chamber is stopped.

[0025] The above-mentioned filter cartridge testing method, after the filter cartridge is installed in the box and filled with dust gas, the dust concentration t1 in the dust room is measured by the first dust sensor, and the dust concentration t2 in the clean room is measured by the second dust sensor. Then, by comparing t1 and t2, the filtration efficiency of the filter cartridge can be obtained quickly and conveniently. By monitoring the pressure difference s between the dust room and the clean room measured by the differential pressure sensor, the accumulation of dust on the filter cartridge can be understood. When the pressure difference s is less than the preset maximum value, the filter cartridge works normally. When the pressure difference s is greater than the preset maximum value, too much dust accumulates on the filter cartridge, which will cause the filter cartridge to be unable to filter normally and interfere with the test of the filter efficiency of the filter cartridge. Therefore, stop filling the dust chamber with dust gas at this time, and clean or replace the filter cartridge to measure a more accurate filtration efficiency of the filter cartridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of 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 creative work.

[0028] Figure 1 Schematic diagram of the structure of the filtration efficiency detection system according to an embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the filter cartridge testing method according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 100. Box body, 110. Partition, 120. Dust chamber, 130. Clean room, 210. First dust sensor, 220. Second dust sensor, 300. Differential pressure sensor, 410. Nozzle, 420. Pressure sensor, 430. Injection part, 440. Pulse valve, 450. Main pipe, 460. Branch pipe, 510. Inlet pipe, 511. Filter, 520. Transfer pipe, 530. Discharge valve, 540. Outlet pipe, 550. Fan, 560. Feeding part, 570. Anemometer, 10. Filter cartridge, 11. Filter paper. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The "first" and "second" in the present invention do not represent specific quantities and orders, but are only used to distinguish names.

[0036] like Figure 1 As shown, one embodiment discloses a filtration efficiency detection system, including a box body 100, a first dust sensor 210, a second dust sensor 220 and a differential pressure sensor 300. A partition 110 is provided in the box body 100, and the box body 100 is divided into a dust chamber 120 and a clean room 130 by the partition 110. A mounting port for installing a filter cartridge 10 is provided on the partition 110, and the clean room 130 is used to communicate with the outlet of the filter cartridge 10. An air inlet connected to the dust chamber 120 and an air outlet connected to the clean room 130 are provided on the box body 100. The first dust sensor 210 is used to measure the dust concentration at the air inlet, the second dust sensor 220 is used to measure the dust concentration at the air outlet, and the differential pressure sensor 300 is used to measure the pressure difference between the dust chamber 120 and the clean room 130.

[0037] In the above-mentioned filtration efficiency detection system, the installation port on the partition 110 can be used to install the filter cartridge 10. At this time, if dust gas is introduced into the dust chamber 120 through the air inlet, the filtered gas can be discharged into the clean room 130 through the outlet of the filter cartridge 10 after filtering through the filter cartridge 10, and discharged through the air outlet. In the process of the filter cartridge 10 filtering the dust gas, the first dust sensor 210 can measure the dust concentration at the air inlet, and the second dust sensor 220 can measure the dust concentration at the air outlet, that is, the first dust sensor 210 can measure the dust concentration of the dust gas before filtration, and the second dust sensor 220 can measure the dust concentration of the gas after filtration. By comparing the values ​​measured by the first dust sensor 210 and the second dust sensor 220, the filtration efficiency of the filter cartridge 10 can be understood, and the above-mentioned dust The filtration system can conveniently and quickly measure the filtration efficiency of the filter cartridge 10 for dust gas. At the same time, the differential pressure sensor 300 can measure the pressure difference between the dust chamber 120 and the clean room 130. The absolute value of this pressure difference is positively correlated with the dust accumulation on the filter cartridge 10. When the absolute value of the pressure difference is larger, the more dust accumulates on the filter cartridge 10, which will cause the filtration of the filter cartridge 10 to decrease, affecting the test of the filtration efficiency of the filter cartridge 10. Therefore, by setting the differential pressure sensor 300, the dust accumulation on the filter cartridge 10, the initial pressure difference when the filter cartridge is working, and the normal working pressure difference can be monitored. This can facilitate the staff to promptly remove the dust on the filter cartridge 10 or replace the filter cartridge 10 when a lot of dust accumulates on the filter cartridge 10, so as to ensure that the filtration efficiency of the filter cartridge 10 during normal operation can be measured, thereby improving the accuracy of the test.

[0038] In addition, the differential pressure sensor 300 can also determine whether the filter cartridge 10 is damaged by the absolute value of the pressure difference. When the absolute value of the pressure difference is too small, it is necessary to consider that the filter cartridge 10 is damaged, and the test can be stopped in time to prevent invalid test results. Therefore, the test efficiency can be improved and the test cost can be saved.

[0039] Optionally, the partition 110 is provided with multiple mounting openings. In this case, multiple filter cartridges 10 from the same batch can be installed. During the filtration test, the multiple filter cartridges 10 can filter dust simultaneously. In this case, the dust concentration measured by the first dust sensor 210 and the dust concentration measured by the second dust sensor 220 can be compared first, and then the filtration efficiency of the filter cartridge 10 can be obtained. Since this is the filtration efficiency of the filter cartridge 10 obtained when multiple filter cartridges 10 work together, it can better represent the filtration efficiency of the filter cartridges 10 from the same batch.

[0040] Optionally, the above-mentioned filtration efficiency detection system also includes an adapter ring, which is arranged at the installation port and is used to be mounted on the outside of the filter cartridge 10. The adapter ring is made of elastic material. When the filter cartridge 10 and the installation port are gap-fitted, the adapter ring can be used to fill the gap between the filter cartridge 10 and the inner wall of the installation port to ensure the installation stability and sealing of the filter cartridge 10. At this time, the above-mentioned filtration efficiency detection system can be used to detect filter cartridges 10 of different sizes, and has a wider range of applications.

[0041] Optionally, the filtration efficiency testing system further includes a plug, which is disposed at the mounting opening and has an interference fit with the mounting opening. The plug can be used to block redundant mounting openings, making it easier to adjust the number of filter cartridges 10 according to different testing requirements, thereby improving the applicability of the filtration efficiency testing system.

[0042] Optionally, the dust sensor can be used to detect dust concentration, particle size, etc., so the first dust sensor 210 and the second dust sensor 220 can also test the filtering capacity of the filter cartridge 10 by observing the difference in particle size.

[0043] Optionally, the differential pressure sensor 300 includes two test ends, which extend into the dust chamber 120 and the clean room 130 respectively. The differential pressure sensor 300 obtains the pressure difference between the dust chamber 120 and the clean room 130 through the two test ends, where the pressure difference is a positive value.

[0044] In one embodiment, Figure 1 As shown, the filtration efficiency testing system further includes a nozzle 410 and a pressure sensor 420. The nozzle 410 is used to spray pulsed gas into the filter cartridge 10 through the outlet of the filter cartridge 10. The pressure sensor 420 is disposed within the dust chamber 120 and opposite the filter paper 11 of the filter cartridge 10. Spraying pulsed gas into the filter cartridge 10 through the nozzle 410 reverses the airflow direction inside and outside the filter cartridge 10 compared to that during filtration. This allows dust accumulated outside the filter cartridge 10 to be blown away, allowing the filter cartridge 10 to return to a normal filtration state. This simple and efficient method of clearing dust accumulated outside the filter cartridge 10 helps improve the efficiency of the filter cartridge 10 test. The pressure sensor 420 also senses the air pressure emitted by the filter paper 11 when the nozzle 410 sprays air, providing information about the filter cartridge 10 during dust cleaning using the nozzle 410. This allows for a better understanding of various parameters of the filter cartridge 10 and enables a comprehensive test of the filter cartridge 10.

[0045] In one embodiment, Figure 1As shown, there are multiple pressure sensors 420, and the pressure sensors 420 are sequentially arranged along the length direction of the filter cartridge 10. By providing multiple pressure sensors 420, when the nozzle 410 sprays air into the filter cartridge 10, the air pressure sprayed from the filter paper 11 of each portion along the length direction of the filter cartridge 10 can be detected, so that the cleaning effect of each portion of the filter paper 11 on the filter cartridge 10 can be understood. Therefore, at this time, the above-mentioned filtration efficiency detection system can perform multiple types of comprehensive tests on the filter cartridge 10. Compared with performing different types of tests separately, the above-mentioned filtration efficiency detection system is easy to use, takes less time and is lower in cost. According to the above-mentioned test results, technicians can adjust the structure of the filter cartridge 10 or the parameters of the nozzle 410 jet, so as to prevent the filter paper 11 from having too low an air pressure when cleaning, resulting in poor cleaning effect.

[0046] Optionally, the pressure sensor 420 is a strip pressure sensor, and the distribution diagram of the spray air pressure of different parts in the length direction of the filter paper 11 when the filter cartridge 10 is cleaned can be obtained through multiple pressure sensors 420, thereby obtaining the area with the smallest spray air pressure on the filter paper 11. The parameters of the jet of the nozzle 410 can be adjusted accordingly or the structure of the filter cartridge 10 can be changed to improve the cleaning effect of the filter cartridge 10.

[0047] In one embodiment, Figure 1 As shown, the above-mentioned filtration efficiency detection system also includes an air jet 430 and a pulse valve 440. The air jet 430 is connected to the nozzle 410, and the pulse valve 440 is used to control the opening or closing of the nozzle 410. When the dust filtration efficiency test is performed, the pulse valve 440 is closed to close the nozzle 410. When the differential pressure sensor 300 senses that the absolute value of the pressure difference between the inside and outside of the filter cartridge 10 is too large, the filling of the dust chamber 120 with dust gas can be suspended, and the pulse valve 440 and the air jet 430 are opened to perform pulse spraying on the filter cartridge 10 for dust cleaning. The air jet 430 and the pulse valve 440 cooperate to spray high-pressure gas, so that the air pressure of the airflow sprayed from the inside to the outside of the filter cartridge 10 is higher, and the dust cleaning effect is better.

[0048] Specifically, the injection member 430 is a gas collecting bag. In this case, the injection member 430 is easy to operate, has a reasonable and safe design, and can continuously and stably output gas.

[0049] Optionally, a stopper is provided within the dust chamber 120. The stopper is an annular structure and is adapted to be sleeved over the filter paper 11. The stopper and the filter paper 11 are loosely fitted. The high-pressure gas ejected by the jet element 430 and the pulse valve 440 may cause the filter paper 11 of the filter cartridge 10 to vibrate, which may improve the cleaning effect of the filter cartridge 10 to a certain extent. However, excessive vibration of the filter paper 11 may affect the stability of the overall structure of the filter cartridge 10. Therefore, the stopper is sleeved over the filter paper 11 and loosely fitted with the filter paper 11, allowing the filter paper 11 to vibrate within a small range during cleaning, thereby improving the cleaning effect. At the same time, the amplitude of the vibration is limited and does not damage the overall structure of the filter cartridge 10. Specifically, a plurality of stoppers are provided, with different stoppers spaced apart along the length of the filter cartridge 10. The pressure sensor 420 is provided between two adjacent stoppers, so that the stoppers and the pressure sensor 420 do not interfere with each other, thereby improving the accuracy of the above-mentioned filtration efficiency detection system.

[0050] Optionally, the nozzles 410 are disposed opposite the mounting ports, with one or at least two nozzles 410 corresponding to each mounting port. A main pipe 450 and a branch pipe 460 are disposed between the nozzle member 430 and the nozzle 410. The branch pipes 460 are disposed in a one-to-one correspondence with the nozzles 410 and are respectively connected to the main pipe 450. The pulse valve 440 is disposed on the main pipe 450, which is connected to the nozzle member 430. This ensures that the nozzles 410 can be opened or closed together.

[0051] In other embodiments, there are at least two pulse valves 440, which are arranged in a manner corresponding to the number of nozzles 410, with one pulse valve 440 controlling the opening or closing of one nozzle 410. This allows for more precise control, and allows for dust cleaning even when there are fewer filter cartridges 10 being inspected.

[0052] In one embodiment, Figure 1 As shown, the filtration efficiency testing system further includes an air inlet pipe 510, a transfer pipe 520, and a discharge valve 530. The air inlet pipe 510 is connected to the air inlet, and both ends of the transfer pipe 520 are connected to the lower end of the dust chamber 120 and the air inlet pipe 510, respectively. The discharge valve 530 is provided on the transfer pipe 520 and is used to transfer dust into the air inlet pipe 510. After the filter cartridge 10 is cleaned, the dust accumulated on the filter cartridge 10 falls to the lower area of ​​the dust chamber 120. The dust accumulated in the lower area of ​​the dust chamber 120 can be transferred to the air inlet pipe 510 through the discharge valve 530 and re-sucked into the dust chamber 120 by the air inlet pipe 510, thereby realizing the cyclic quantitative powder feeding and utilization of the test dust, reducing the operation of collecting and cleaning the dust, thereby reducing the manpower, material resources and time required for testing, and lowering the testing cost.

[0053] Specifically, the discharge valve 530 is a rotary discharge valve 530 , which can control the transfer speed of the dust and facilitate the adjustment of the dust content in the air inlet pipe 510 .

[0054] In one embodiment, Figure 1 As shown, the above-mentioned filtration efficiency detection system also includes an air outlet pipe 540, a fan 550 and a feeding piece 560. The air inlet pipe 510 is connected to the air inlet, and the air outlet pipe 540 is connected to the air outlet. A filter screen 511 is provided at the end of the air inlet pipe 510, and the fan 550 is provided at the end of the air outlet pipe 540. The feeding piece 560 is provided on the air inlet pipe 510 and is located between the filter screen 511 and the box body 100. The fan 550 draws air through the outlet pipe 540, creating a negative pressure within the housing 100. Air then enters the dust chamber 120 through the inlet pipe 510. The inlet pipe 510 is equipped with a filter 511, which prevents impurities from the external air from entering the dust chamber 120 and affecting the filter efficiency test of the filter cartridge 10. The feeding member 560 can be used to feed dust and other materials into the inlet pipe 510 to adjust the dust content. Other materials can also be added to perform other types of filter efficiency tests on the filter cartridge 10. Furthermore, the feeding member 560 supplements the dust circulation between the discharge valve 530 and the dust chamber 120. Optionally, the feeding member 560 is funnel-shaped and equipped with a valve. The valve controls the feeding rate.

[0055] In one embodiment, Figure 1 As shown, the filtration efficiency detection system further includes an anemometer 570, which is located in the air outlet pipe 540 and is arranged on the side of the fan 550 away from the housing 100. The anemometer 570 can be used to detect the wind speed in the air outlet pipe 540, which can be used as a parameter for the filtration test of the filter cartridge 10, facilitating a comprehensive test of the filtration efficiency of the filter cartridge 10.

[0056] In one embodiment, Figure 1 As shown, the clean room 130 is located above the dust chamber 120, and the lower end of the dust chamber 120 is in the shape of an inverted pyramid. Dust in the dust chamber 120 can then automatically fall and accumulate at the lower end of the dust chamber 120. Because the lower end of the dust chamber 120 is in the shape of an inverted pyramid, the accumulated dust can be gathered into a small area, facilitating centralized transfer via the discharge valve 530. This eliminates the need for centralized dust cleaning, improves the automation level of the filtration efficiency detection system, and reduces the manpower and material resources required for cleaning.

[0057] In one embodiment, Figure 1As shown, the filtration efficiency detection system further includes a processor and a display. The processor is electrically connected to the first dust sensor 210, the second dust sensor 220, and the differential pressure sensor 300, and the display is electrically connected to the processor. The processor can collect data from the first dust sensor 210, the second dust sensor 220, and the differential pressure sensor 300 and display it on the display. The processor can also process the data measured by the first dust sensor 210 and the second dust sensor 220 according to a preset program to obtain the filtration efficiency of the filter cartridge 10.

[0058] like Figure 1 and Figure 2 As shown, one embodiment discloses a filter cartridge testing method, which uses the above-mentioned filtration efficiency detection system and includes the following steps:

[0059] Install the filter cartridge 10 at the installation opening on the partition 110 , and the outlet of the filter cartridge 10 is connected to the clean room 130 ;

[0060] Filling dust gas into the dust chamber 120 through the air inlet;

[0061] Obtain the dust concentration t1 measured by the first dust sensor 210, the dust concentration t2 measured by the second dust sensor 220, and the pressure difference s of the differential pressure sensor 300 respectively;

[0062] When the absolute value of the pressure difference s is less than the preset maximum value, t1 is compared with t2 to obtain the filtration efficiency of the filter cartridge 10;

[0063] When the absolute value of the pressure difference s is greater than or equal to the preset maximum value, the filling of dust gas into the dust chamber 120 is stopped.

[0064] In the above-mentioned filter cartridge testing method, after the filter cartridge 10 is installed in the box 100 and filled with dust gas, the dust concentration t1 in the dust chamber 120 is measured by the first dust sensor 210, and the dust concentration t2 in the clean room 130 is measured by the second dust sensor 220. Then, by comparing t1 and t2, the filtration efficiency of the filter cartridge 10 can be obtained conveniently and quickly. By monitoring the absolute value of the pressure difference s between the dust chamber 120 and the clean room 130 measured by the differential pressure sensor 300, the dust accumulation on the filter cartridge 10 can be understood. When the pressure difference s is less than the preset maximum value, the filter cartridge is working normally. When the absolute value of the pressure difference s is greater than the preset maximum value, too much dust has accumulated on the filter cartridge 10, which will cause the filter cartridge 10 to be unable to filter normally and interfere with the test of the filtration efficiency of the filter cartridge 10. Therefore, at this time, stop filling the dust chamber 120 with dust gas, and clean or replace the filter cartridge 10 to measure a more accurate filtration efficiency of the filter cartridge 10.

[0065] The preset maximum value is the absolute value of the pressure difference measured by the pressure difference sensor 300 when the filter cartridge 10 is covered with dust and cannot perform filtering.

[0066] Optionally, the above comparison of t1 and t2 to obtain the filtration efficiency of the filter cartridge 10 specifically includes the following steps:

[0067] The filtration efficiency of the filter cartridge 10 is h=(1-t2 / t1)*100%. The larger h is, the higher the filtration efficiency of the filter cartridge 10 is.

[0068] In other embodiments, t1 and t2 may be compared in other ways, such as h=t1 / t2. A higher h indicates a higher filtration efficiency of the filter cartridge 10.

[0069] Optionally, after respectively obtaining the dust concentration t1 measured by the first dust sensor 210, the dust concentration t2 measured by the second dust sensor 220, and the pressure difference s of the differential pressure sensor 300, the following steps may also be included:

[0070] When the absolute value of the pressure difference s is less than a preset minimum value, the filling of dust gas into the dust chamber 120 is stopped.

[0071] When the filter cartridge 10 is working normally, the absolute value of the pressure difference that can be measured by the pressure differential sensor 300 will be within a range. If the absolute value of the pressure difference s is too small, it means that the filter cartridge 10 is damaged or the seal of the filter cartridge 10 fails when it is installed. At this time, the filtration efficiency test of the filter cartridge 10 will inevitably fail to obtain the true filtration efficiency of the filter cartridge 10. Therefore, stop filling the dust chamber 120 with dust gas to prevent invalid testing, thereby saving testing time and reducing testing costs.

[0072] Among them, the above-mentioned preset minimum value can be set according to the minimum value of the absolute value of the internal and external pressure difference when the filter cartridge 10 is working normally in the industry, and the above-mentioned preset minimum value can be increased or decreased according to the specific situation of the filter cartridge 10. Since the filter cartridge 10 must have a certain filtering effect, the preset minimum value should be greater than 0.

[0073] Optionally, after stopping the injection of dust gas into the dust chamber 120 when the absolute value of the pressure difference s is greater than or equal to a preset maximum value, the following steps may be further included:

[0074] Open the jet element 430 and the pulse valve 440, and spray pulse gas into the filter cartridge 10 through the nozzle 410. At this time, the dust outside the filter cartridge 10 can be washed down, which is convenient for subsequent dust collection and allows the filter cartridge 10 to be retested for filtration efficiency.

[0075] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A filtration efficiency detection system, characterized in that: include: A box body, wherein a partition is provided inside the box body, and the box body is divided into a dust chamber and a clean chamber by the partition body, the partition body is provided with a mounting port for mounting a filter cartridge, the clean chamber is used to communicate with the outlet of the filter cartridge, and the box body is provided with an air inlet communicating with the dust chamber and an air outlet communicating with the clean chamber; a first dust sensor, configured to measure dust concentration at the air inlet; a second dust sensor, the second dust sensor being used to measure the dust concentration at the air outlet; and A differential pressure sensor is used to measure the pressure difference between the dust chamber and the clean room; the differential pressure sensor includes two test ends, and the two test ends extend into the dust chamber and the clean room respectively; It also includes an air inlet pipe, a transfer pipe and a discharge valve, the air inlet pipe is connected to the air inlet, the two ends of the transfer pipe are respectively connected to the lower end of the dust chamber and the air inlet pipe, and the discharge valve is provided on the transfer pipe, and the discharge valve is used to transfer dust into the air inlet pipe; It also includes an adapter ring, which is arranged at the installation port and is used to be sleeved outside the filter cartridge.

2. The filtration efficiency detection system according to claim 1, characterized in that: It also includes a nozzle and a pressure sensor. The nozzle is used to spray pulse gas into the filter cartridge through the outlet of the filter cartridge. The pressure sensor is arranged in the dust chamber and is opposite to the filter paper of the filter cartridge.

3. The filtration efficiency detection system according to claim 2, characterized in that: There are multiple pressure sensors, and the pressure sensors are arranged in sequence along the length direction of the filter cartridge.

4. The filtration efficiency detection system according to claim 2, characterized in that: It also includes an air jet component and a pulse valve. The air jet component is connected to the nozzle, and the pulse valve is used to control the opening or closing of the nozzle air jet.

5. The filtration efficiency detection system according to claim 1, characterized in that: It also includes an air outlet pipe, a fan and a feeding piece. The air inlet pipe is connected to the air inlet, the air outlet pipe is connected to the air outlet, a filter is provided at the end of the air inlet pipe, the fan is provided at the end of the air outlet pipe, and the feeding piece is provided on the air inlet pipe and located between the filter and the box.

6. The filtration efficiency detection system according to claim 5, characterized in that: It also includes an anemometer, which is located in the air outlet pipe and is arranged on a side of the fan away from the box body.

7. The filtration efficiency detection system according to claim 1, characterized in that: The clean room is arranged above the dust room, and the lower end of the dust room is in an inverted pyramid shape.

8. The filtration efficiency detection system according to claim 2 or 3, characterized in that: The pressure sensor is a strip-shaped pressure sensor.

9. The filtration efficiency detection system according to any one of claims 1 to 7, characterized in that: The system further includes a processor and a display. The processor is electrically connected to the first dust sensor, the second dust sensor, and the pressure difference sensor. The display is electrically connected to the processor.

10. A filter cartridge testing method, characterized in that: The filtration efficiency detection system according to any one of claims 1 to 9 is applied, comprising the following steps: Installing the filter cartridge at the installation opening on the partition, wherein the outlet of the filter cartridge is connected to the clean room; Filling the dust chamber with dust gas through the air inlet; Obtaining the dust concentration t1 measured by the first dust sensor, the dust concentration t2 measured by the second dust sensor, and the pressure difference s of the differential pressure sensor respectively; When the pressure difference s is less than a preset maximum value, t1 is compared with t2 to obtain the filtration efficiency of the filter cartridge; When the pressure difference s is greater than or equal to a preset maximum value, the filling of dust gas into the dust chamber is stopped.

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