CN111318103A - Filtration efficiency detection system and filter cartridge test method - Google Patents

Abstract

The invention discloses a filtration efficiency detection system and a filter cartridge testing method. The filtration efficiency detection system includes a box body, a first dust sensor, a second dust sensor and a pressure difference sensor. The board is divided into a dust chamber and a clean room. The partition plate is provided with an installation port for installing the filter cartridge. The clean room is used to communicate with the outlet of the filter cartridge. The box body is provided with an air inlet connected to the dust chamber and to the clean room Connected air outlet, 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 differential pressure sensor is used to measure the pressure between the dust chamber and the clean room difference. The above filtration efficiency detection system can easily and quickly measure the filtration efficiency of the filter cartridge, and the differential pressure sensor can measure the pressure difference, which is used to monitor the accumulation of dust on the filter cartridge and remind the staff to remove the dust on the filter cartridge in time. Or replace the filter cartridge to improve the accuracy of the test.

Description

Filtration efficiency detection system and filter cartridge test method

technical field

The invention relates to the technical field of testing equipment, in particular to a filtration efficiency detection system and a filter cartridge testing method.

Background technique

With the rapid development of national environmental protection technology, the country's requirements for industrial pollution emission standards are also getting higher and higher, and air filtration has become a hot issue of social concern. During the emission process, various pollutants such as particulate matter and nitrogen oxides in the air It can be effectively treated by the dust removal system to reduce the air pollution caused by the exhaust gas of the enterprise. However, it takes a lot of time and expense to test the working efficiency of the dust removal system traditionally, and the test is not accurate enough to meet the requirements of enterprises for fast and accurate testing and debugging of the filter cartridge of the dust removal system.

SUMMARY OF THE INVENTION

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

Its technical solutions are as follows:

A filtration efficiency detection system, comprising:

A box body, the box body is provided with a partition plate, the box body is divided into a dust chamber and a clean room by the partition plate, the partition plate is provided with an installation port for installing a filter cartridge, and the clean room is used for In communication with the outlet of the filter cartridge, the box body is provided with an air inlet communicated with the dust chamber and an air outlet communicated with the clean room;

a first dust sensor, the first dust sensor is used to measure the dust concentration at the air inlet;

a second dust sensor for measuring the dust concentration at the air outlet; and

A differential pressure sensor, which is used to measure the pressure difference between the dust chamber and the clean room.

In the above filter efficiency detection system, the installation port on the partition can be used to install the filter cartridge. At this time, if the dust gas is introduced into the dust chamber through the air inlet, the filtered gas can be discharged from the outlet of the filter cartridge after being filtered by the filter cartridge. 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 at the air outlet. The dust sensor can measure the dust concentration of the dust gas before filtering, and the second dust sensor can measure the dust concentration of the filtered gas. filter efficiency, the above dust filtration system can easily and quickly measure the filtration efficiency of the filter cartridge for dust gas, and the differential pressure sensor can measure the pressure difference between the dust chamber and the clean room, and the absolute value of the pressure difference There is a positive correlation with the accumulation of dust on the filter cartridge. When the absolute value of the pressure difference is larger, the more dust accumulates on the filter cartridge, which will lead to the decrease of the filtration of the filter cartridge and affect the test of the filtration efficiency of the filter cartridge. The differential pressure sensor is set to monitor the accumulation of dust on the filter cartridge, the initial pressure difference when the filter cartridge is working, and the normal working pressure difference, which can facilitate the staff to remove the dust on the filter cartridge in time when there is a lot of dust accumulated on the filter cartridge. Replace the filter cartridge to ensure that the filtration efficiency of the filter cartridge can be measured when it is working normally, and to improve the accuracy of the test.

In one embodiment, the filter efficiency detection system further includes a spray head and a pressure sensor, the spray head is used to spray pulse gas into the filter cartridge through the outlet of the filter cartridge, and the pressure sensor is arranged on the dust Indoor and opposite to the filter paper of the filter cartridge.

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

In one embodiment, the filtering efficiency detection system further includes a jetting member and a pulse valve, the jetting member communicates with the spray head, and the pulse valve is used to control the opening or closing of the jetting of the spray head.

In one embodiment, the filter efficiency detection system further includes an air inlet pipe, a transfer pipe and a discharge valve, the air inlet pipe is communicated with the air inlet, and the two ends of the transfer pipe are respectively connected with the dust chamber. The lower end is communicated with the air inlet pipe, the discharge valve is arranged on the transfer pipe, and the discharge valve is used for transferring dust into the air inlet pipe.

In one embodiment, the filtering efficiency detection system further includes an air outlet pipe, a fan and a feeding part, the air inlet pipe is communicated with the air inlet, the air outlet pipe is communicated with the air outlet, and the air inlet pipe is in communication with the air outlet. A filter screen is arranged at the end, the fan is arranged at the end of the air outlet pipe, and the feeding piece is arranged on the air inlet pipe and is located between the filter screen and the box body.

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

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

In one embodiment, the filter efficiency detection system further includes a processor and a display, the processor is electrically connected to the first dust sensor, the second dust sensor and the differential pressure sensor, and the display electrically connected to the processor.

A filter cartridge testing method, applying the filtration efficiency detection system as described in any of the above, comprises the following steps:

The filter cartridge is installed at the installation port on the separator, and the outlet of the filter cartridge is communicated with the clean room;

Filling dust gas into the dust chamber through the air inlet;

respectively 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 value s of the pressure difference sensor;

When the pressure difference s is less than the preset maximum value, compare t1 with t2 to obtain the filtration efficiency of the filter cartridge;

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

In the above filter cartridge test method, after the filter cartridge is installed in the box and filled with dust gas, the dust concentration t1 in the dust chamber is measured by the first dust sensor, the dust concentration t2 in the clean room is measured by the second dust sensor, and then By comparing t1 and t2, the filtration efficiency of the filter cartridge can be easily and quickly obtained, and by monitoring the pressure difference s between the dust chamber and the clean room measured by the differential pressure sensor, we can understand the accumulation of dust on the filter cartridge. In other cases, when the pressure difference s is less than the preset maximum value, the filter cartridge works normally. When the pressure difference value s is greater than the preset maximum value, too much dust accumulates on the filter cartridge, which will cause the filter cartridge to fail to filter normally. It will interfere with the test of the filtration efficiency of the filter cartridge, so stop filling the dust chamber with dust gas at this time, and the filter cartridge can be cleaned or replaced, so as to measure the more accurate filtration efficiency of the filter cartridge.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a filtering efficiency detection system according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of the filter cartridge testing method according to the embodiment of the present invention.

Description of reference numbers:

100, box, 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 , jet parts, 440, pulse valve, 450, main pipe, 460, branch pipe, 510, intake pipe, 511, filter screen, 520, transfer pipe, 530, discharge valve, 540, air outlet pipe, 550, fan, 560, feeding Pieces, 570, anemometer, 10, filter cartridge, 11, filter paper.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The "first" and "second" mentioned in the present invention do not represent a specific quantity and order, but are only used for the distinction of names.

As shown in FIG. 1 , an embodiment discloses a filtering efficiency detection system, including a box body 100, a first dust sensor 210, a second dust sensor 220 and a differential pressure sensor 300. The box body 100 is provided with a partition 110, The box body 100 is divided into a dust chamber 120 and a clean room 130 by the partition plate 110 . The partition plate 110 is provided with an installation port for installing the filter cartridge 10 , and the clean room 130 is used for communicating with the outlet of the filter cartridge 10 . An air inlet communicated with the dust chamber 120 and an air outlet communicated with the clean room 130 are provided. The first dust sensor 210 is used to measure the dust concentration at the air inlet, and the second dust sensor 220 is used to measure the dust at the air outlet. Concentration, the differential pressure sensor 300 is used to measure the pressure difference between the dust chamber 120 and the clean room 130 .

In the above filtering efficiency detection system, the installation port on the partition plate 110 can be used to install the filter cartridge 10. At this time, if the dust gas is introduced into the dust chamber 120 through the air inlet, the filter cartridge 10 can be filtered by the outlet of the filter cartridge 10. The filtered gas is discharged into the clean room 130 and discharged through the air outlet. During the process of filtering the dust gas by the filter cartridge 10, 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 inlet. 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 filtering, and the second dust sensor 220 can measure the dust concentration of the filtered gas. By comparing the first dust sensor 210 and the The value measured by the second dust sensor 220 can be used to know the filtration efficiency of the filter cartridge 10, so the above-mentioned dust filtration system can easily and quickly measure the filtration efficiency of the filter cartridge 10 for dust gas, and the differential pressure sensor 300 can measure the dust chamber. The pressure difference between 120 and the clean room 130, and the absolute value of this pressure difference is positively correlated with the accumulation of dust on the filter cartridge 10. When the absolute value of the pressure difference is larger, the dust accumulation on the filter cartridge 10 The more it is, the filtration of the filter cartridge 10 will decrease, which will affect the test of the filtration efficiency of the filter cartridge 10. Therefore, by setting the differential pressure sensor 300, the accumulation of dust on the filter cartridge 10 can be monitored, the initial pressure difference when the filter cartridge is working, The normal working pressure difference can facilitate the staff to remove the dust on the filter cartridge 10 or replace the filter cartridge 10 in time 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 and improve the test. accuracy.

In addition, the differential pressure sensor 300 can also judge whether the filter cartridge 10 is damaged by the absolute value of the differential pressure value. When the absolute value of the differential pressure value is too small, it is necessary to consider that the cartridge 10 is damaged, and the test can be stopped in time to prevent invalid tests from occurring. As a result, it is thus possible to improve the test efficiency and save the test cost.

Optionally, the partition plate 110 is provided with a plurality of installation openings. At this time, multiple filter cartridges 10 of the same batch can be installed. During the filtration test, the multiple filter cartridges 10 can filter dust at the same time. At this time, the dust concentration measured by the first dust sensor 210 can be compared with the second dust sensor. 220 measured dust concentration, then the filtration efficiency of the filter cartridge 10 will be obtained. Since the filtration efficiency of the filter cartridge 10 obtained when multiple filter cartridges 10 work together at this time, it can better represent the filtration efficiency of the same batch of filter cartridges 10. .

Optionally, the above-mentioned filtration efficiency detection system also includes an adapter ring, the adapter ring is arranged at the installation port and used to be sleeved outside the filter cartridge 10, and the adapter ring is an elastic material, when the filter cartridge 10 and the installation port are clearance fit. At this time, an 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 stable installation and tightness of the filter cartridge 10. At this time, the above-mentioned filtration efficiency detection system can be used to detect different sizes of filter cartridges 10. , the scope of application is wider.

Optionally, the above-mentioned filtering efficiency detection system further includes a plug, which is arranged at the installation port and has an interference fit with the installation port. The plug can be used to block the redundant installation openings, so that the number of filter cartridges 10 can be easily adjusted according to different requirements of detection, and the applicability of the above-mentioned filtration efficiency detection system can be improved.

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

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

In one embodiment, as shown in FIG. 1 , the filter efficiency detection system further includes a spray head 410 and a pressure sensor 420 . The spray head 410 is used for spraying pulsed gas into the filter cartridge 10 through the outlet of the filter cartridge 10 , and the pressure sensor 420 is set to It is arranged in the dust chamber 120 and opposite to the filter paper 11 of the filter cartridge 10 . By spraying the pulse gas into the filter cartridge 10 through the nozzle 410, the direction of the airflow inside and outside the filter cartridge 10 can be opposite to that of the filter cartridge 10. At this time, the dust accumulated outside the filter cartridge 10 can be sprayed away, so that the filter cartridge 10 can be in a normal filtering state again. , the above method of cleaning the dust accumulated outside the filter cartridge 10 is simple and efficient, which helps to improve the testing efficiency of the filter cartridge 10 . At the same time, the pressure sensor 420 can sense the air pressure ejected by the filter paper 11 when the nozzle 410 is sprayed, so as to understand the condition of the filter cartridge 10 when the nozzle 410 is used to clean the dust, it can better understand the parameters of the filter cartridge 10 in various aspects, and realize the adjustment of the filter cartridge 10. 10 comprehensive tests.

In one embodiment, as shown in FIG. 1 , there are multiple pressure sensors 420 , and the pressure sensors 420 are arranged in sequence along the length direction of the filter cartridge 10 . By arranging a plurality of pressure sensors 420, when the spray head 410 blows air into the filter cartridge 10, the air pressure sprayed from the filter paper 11 of each part of the filter cartridge 10 in the longitudinal direction can be detected, and the air pressure of the filter paper 11 on the filter cartridge 10 can be known. The effect of each part in cleaning the dust, so at this time the above-mentioned filtration efficiency detection system can perform various types of comprehensive tests on the filter cartridge 10. Compared with different types of tests, the above-mentioned filtration efficiency detection system is easy to use and takes time. Smaller and lower cost, technicians can adjust the structure of the filter cartridge 10 or the parameters of the spray head 410 according to the above test results, so as to prevent the filter paper 11 from being too small and causing poor cleaning effect.

Optionally, the pressure sensor 420 is a band-shaped pressure sensor, and a plurality of pressure sensors 420 can be used to obtain the distribution diagram of the air pressure ejected at different parts of the filter paper 11 in the length direction when the filter cartridge 10 is cleaned, and then the ejection on the filter paper 11 can be obtained. In the area with the smallest air pressure, 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 .

In one embodiment, as shown in FIG. 1 , the above-mentioned filtering efficiency detection system further includes an air jet 430 and a pulse valve 440 . 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 can be suspended. Dust gas, and open the pulse valve 440 and the air jet 430 to pulse the filter cartridge 10 for cleaning dust. The air jet 430 cooperates with the pulse valve 440 to eject high-pressure gas, so that the filter cartridge 10 is ejected from the inside to the outside. The air pressure of the air flow is higher, and the cleaning effect is better.

Specifically, the air jet 430 is a gas collecting bag. At this time, the air jet 430 is easy to operate, reasonable and safe in design, and can output gas continuously and stably.

Optionally, a limiter is provided in the dust chamber 120. The limiter is an annular structure and is used to be sleeved outside the filter paper 11. The limiter and the filter paper 11 are in clearance fit. The outgoing high-pressure gas may cause the filter paper 11 of the filter cartridge 10 to vibrate, which can improve the cleaning effect of the filter cartridge 10 to a certain extent. However, excessive jittering of the filter paper 11 will affect the stability of the overall structure of the filter cartridge 10. Therefore, a limit is set. The filter paper 11 is sleeved outside the filter paper 11 and fits with the filter paper 11 in a gap, so that the filter paper 11 can shake in a small range during cleaning, improving the cleaning effect. Specifically, there are a plurality of limiters, different limiters are arranged at intervals along the length direction of the filter cartridge 10 , and the pressure sensor 420 is arranged between two adjacent limiters, so that the limiter and the pressure sensor 420 are in contact with each other. The work does not interfere with each other, and the detection accuracy of the above filtering efficiency detection system is improved.

Optionally, the nozzles 410 are arranged opposite to the installation port, and one or at least two nozzles 410 can be correspondingly arranged in one installation port, a main pipe 450 and a branch pipe 460 are arranged between the air jet 430 and the nozzle 410, and the branch pipes 460 correspond to the nozzles 410 one-to-one. The branch pipes 460 are respectively communicated with the main pipe 450 , the pulse valve 440 is arranged on the main pipe 450 , and the main pipe 450 is communicated with the air jet 430 . At this time, it can be ensured that each nozzle 410 can be turned on or off together.

In other embodiments, there are at least two pulse valves 440 , the pulse valves 440 are set corresponding to the number of the spray heads 410 , and one pulse valve 440 is used to control the opening or closing of one spray head 410 . At this time, the control is more precise, and the cleaning operation can be performed even when there are fewer filter cartridges 10 detected.

In one embodiment, as shown in FIG. 1 , the filtering efficiency detection system further includes an intake pipe 510 , a transfer pipe 520 and a discharge valve 530 , the intake pipe 510 is communicated with the intake port, and the two ends of the transfer pipe 520 are The lower end of the dust chamber 120 is communicated with the air inlet pipe 510 . The discharge valve 530 is arranged on the transfer pipe 520 , and the discharge valve 530 is used to transfer the dust into the air inlet pipe 510 . After cleaning the filter cartridge 10, the dust accumulated on the filter cartridge 10 falls to the lower side area of the dust chamber 120, and the discharge valve 530 can transfer the dust accumulated in the lower side area of the dust chamber 120 to the air intake pipe 510, where the The air intake pipe 510 is re-inhaled into the dust chamber 120 to realize the circulating and quantitative powder utilization of the test dust, and reduce the operation of collecting and cleaning the dust, thus reducing the manpower, material resources and time required for the test, and reducing the test cost.

Specifically, the unloading valve 530 is a rotary unloading valve 530 , which can control the transfer speed of the dust and facilitate the adjustment of the dust content in the intake pipe 510 .

In one embodiment, as shown in FIG. 1 , the above-mentioned filtering efficiency detection system further includes an air outlet pipe 540, a fan 550 and a feeding member 560, the air inlet pipe 510 is communicated with the air inlet, the air outlet pipe 540 is communicated with the air outlet, and the air inlet pipe The end of the 510 is provided with a filter screen 511 , the fan 550 is provided at the end of the air outlet pipe 540 , and the feeding member 560 is provided on the air inlet pipe 510 between the filter screen 511 and the box 100 . The fan 550 draws air through the air outlet pipe 540 to form a negative pressure state in the box body 100. At this time, the air enters the dust chamber 120 through the air inlet pipe 510. Since the air inlet pipe 510 is provided with a filter screen 511, impurities in the outside air can be prevented from entering the dust chamber. 120 affects the test of the filtration efficiency of the filter cartridge 10. The feeding part 560 can be used to put dust and other materials into the air intake pipe 510 to adjust the dust content, and other types of materials can also be added to the filter cartridge 10 for other types of filtering. The filtration efficiency test, in addition, the feeding part 560 can also supplement the dust circulation between the discharge valve 530 and the dust chamber 120 . Optionally, the feeding member 560 is in the shape of a funnel, and a valve is provided on the feeding member 560 . The valve can control the feeding speed.

In one embodiment, as shown in FIG. 1 , the filtering efficiency detection system further includes an anemometer 570 , which is located in the air outlet pipe 540 , and is located on the side of the fan 550 away from the box 100 . Through the anemometer 570 , the wind speed in the air outlet pipe 540 can be detected, which can be used as a parameter for the filtering test of the filter cartridge 10 , which is convenient for comprehensively testing the filtering efficiency of the filter cartridge 10 .

In one embodiment, as shown in FIG. 1 , the clean room 130 is disposed above the dust chamber 120 , and the lower end of the dust chamber 120 is in the shape of an inverted pyramid. At this time, the dust in the dust chamber 120 can automatically fall down and accumulate at the lower end of the dust chamber 120. Since the lower end of the dust chamber 120 is in the shape of an inverted pyramid, the accumulated dust can be collected into a small area, which is convenient for the discharge valve 530 to carry out Centralized transfer eliminates the need to clean and concentrate the dust, which can improve the automation of the above-mentioned filtration efficiency detection system and reduce the manpower and material resources required for cleaning.

In one embodiment, as shown in FIG. 1 , the filter 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 first dust sensor 210 , the second dust sensor 220 and the differential pressure sensor 300 . The processor is electrically connected. At this time, the processor can collect the data of the first dust sensor 210, the second dust sensor 220 and the differential pressure sensor 300, and display them on the display. At the same time, the processor can monitor the first dust sensor 210, the second dust sensor 210, the second dust sensor according to the preset program. The data measured by the sensor 220 is processed to obtain the filtration efficiency of the filter cartridge 10 .

As shown in Figure 1 and Figure 2, an embodiment discloses a filter cartridge testing method, applying the above-mentioned filtration efficiency detection system, including the following steps:

The filter cartridge 10 is installed at the installation port on the partition plate 110, and the outlet of the filter cartridge 10 is communicated with the clean room 130;

The dust chamber 120 is filled with dust gas through the air inlet;

respectively 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 value s of the differential pressure sensor 300;

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

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

In the above filter cartridge test 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 cleanliness is measured by the second dust sensor 220. By comparing the dust concentration t2 in the chamber 130 and comparing t1 and t2, the filtration efficiency of the filter cartridge 10 can be easily and quickly obtained, and the pressure difference between the dust chamber 120 and the clean room 130 measured by the differential pressure sensor 300 The absolute value of the value s is monitored, and the accumulation of dust on the filter cartridge 10 can be understood. When the pressure difference value s is less than the preset maximum value, the filter cartridge works normally. When the absolute value of the pressure difference value s is greater than the preset maximum value , the dust accumulation on the filter cartridge 10 is too much, which will cause the filter cartridge 10 to fail to filter normally, which will interfere with the test of the filtration efficiency of the filter cartridge 10. Therefore, stop filling the dust chamber 120 with dust gas at this time. The cartridge 10 is cleaned or replaced in order to measure the more accurate filtration efficiency of the filter cartridge 10 .

The above-mentioned 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 and accumulated by dust, so that the filtering operation cannot be performed.

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

The filtration efficiency of the filter cartridge 10 is h=(1-t2/t1)*100%. When h is larger, it means that the filtering efficiency of the filter cartridge 10 is higher.

In other embodiments, other ways of comparing t1 and t2 can also be used, for example, h=t1/t2. The higher the h, the higher the filtering efficiency of the filter cartridge 10.

Optionally, after 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 are further included:

When the absolute value of the pressure difference value s is smaller than the preset minimum value, the filling of the dust gas into the dust chamber 120 is stopped.

When the filter cartridge 10 is working normally, the absolute value of the pressure difference measured by the differential pressure sensor 300 will be within a certain range. If the absolute value of the pressure difference value s is too small, it means that the filter cartridge 10 is damaged or the filter cartridge 10 is damaged. In the case of failure of sealing during installation, at this time, the filtration efficiency test of the filter cartridge 10 will inevitably fail to obtain the real filtration efficiency of the filter cartridge 10. Therefore, the filling of dust gas into the dust chamber 120 is stopped to prevent invalid testing, thus saving the testing time. , reduce the cost of testing.

Wherein, the above-mentioned preset minimum value can be set according to the minimum value of the absolute value of the pressure difference between the inside and outside of the filter cartridge 10 during normal operation 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, And because the filter cartridge 10 must have a certain filtering effect, the preset minimum value should be greater than 0.

Optionally, when the absolute value of the pressure difference value s is greater than or equal to the preset maximum value, after stopping the filling of the dust gas into the dust chamber 120, the following steps are further included:

The air jet 430 and the pulse valve 440 are opened, and the pulse gas is sprayed into the filter cartridge 10 through the spray head 410 . At this time, the dust outside the filter cartridge 10 can be washed down to facilitate subsequent collection of the dust, and the filter cartridge 10 can be re-tested for filtration efficiency.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. A filtration efficiency detection system, comprising:

the box body is internally provided with a partition board, the box body is divided into a dust chamber and a clean room by the partition board, the partition board is provided with an installation opening for installing a filter cartridge, the clean room is communicated with an outlet of the filter cartridge, and the box body is provided with an air inlet communicated with the dust chamber and an air outlet communicated with the clean room;

a first dust sensor for measuring a dust concentration at the air inlet;

a second dust sensor for measuring a dust concentration at the air outlet; and

a differential pressure sensor for measuring a pressure difference between the dust chamber and the clean room.

2. The filtration efficiency detection system according to claim 1, further comprising a shower head for spraying a pulse gas into the filter cartridge through an outlet of the filter cartridge, and a pressure sensor provided in the dust chamber and disposed opposite to the filter paper of the filter cartridge.

3. The filtration efficiency detection system according to claim 2, wherein the pressure sensor is provided in plurality, and the pressure sensors are arranged in series along a length direction of the filter cartridge.

4. The filtration efficiency detection system according to claim 2, further comprising an air injection member communicating with the spray head and a pulse valve for controlling opening or closing of air injection of the spray head.

5. The filtration efficiency detection system according to claim 1, further comprising an air inlet pipe, a transfer pipe and a discharge valve, wherein the air inlet pipe is communicated with the air inlet, two ends of the transfer pipe are respectively communicated with the lower end of the dust chamber and the air inlet pipe, the discharge valve is arranged on the transfer pipe, and the discharge valve is used for transferring dust into the air inlet pipe.

6. The filtration efficiency detection system of claim 5, further comprising an air outlet pipe, a fan and a feeding piece, wherein the air inlet pipe is communicated with the air inlet, the air outlet pipe is communicated with the air outlet, a filter screen is arranged at the end of the air inlet pipe, the fan is arranged at the end of the air outlet pipe, and the feeding piece is arranged on the air inlet pipe and is positioned between the filter screen and the box body.

7. The filtration efficiency detection system of claim 6, further comprising an anemometer, wherein the anemometer is located in the air outlet pipe, and the anemometer is arranged on one side of the fan, which is far away from the box body.

8. The filtration efficiency detection system according to claim 5, wherein the clean room is disposed above the dust chamber, and a lower end of the dust chamber is shaped like an inverted pyramid.

9. The filtration efficiency detection system of any one of claims 1-8, further comprising a processor and a display, wherein the processor is electrically connected to the first dust sensor, the second dust sensor, and the differential pressure sensor, and the display is electrically connected to the processor.

10. A filter cartridge testing method, wherein the filtration efficiency testing system according to any one of claims 1 to 9 is applied, comprising the steps of:

installing a filter cartridge at a mounting opening in the partition, the outlet of the filter cartridge being in communication with the clean room;

filling dust gas into the dust chamber through the gas inlet;

respectively 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;

when the pressure difference s is smaller than a preset maximum value, comparing t1 with t2 to obtain the filtering efficiency of the filter cartridge;

and when the pressure difference s is larger than or equal to a preset maximum value, stopping filling the dust gas into the dust chamber.

Images