Testing device for detecting protection performance of filtering piece on water-containing reagent
By designing a test device including a mass flow controller, an airflow temperature control unit, a humidity adjustment unit and a constant temperature box, the problems of poor flow stability, unquantitative humidity adjustment and unstable test environment in the protection performance test of the filter parts for aqueous reagents in the prior art are solved, and more efficient and accurate test results are achieved.
Patent Information
- Application Number
- CN202411657044.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-03-28
AI Technical Summary
Existing test devices used to detect the protective performance of filter parts for aqueous reagents have problems such as poor flow stability, unquantitative humidity adjustment, poor repeatability and unstable test environment.
A test device including a mass flow controller, an air flow temperature control unit, a humidity adjustment unit and a constant temperature chamber are designed. The flow stability is achieved through the mass flow controller, the humidity adjustment unit quantifies the dry-wet and humidity air flow ratio and humidity increase temperature, and the constant temperature box maintains the test environment stable.
The flow stability and humidity are precisely adjusted, which improves the repeatability and environmental stability of the test and reduces the preparation time before the test.
Smart Images
Figure CN119715294A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of protective equipment testing, in particular to a testing device for detecting the protective performance of a filter element against aqueous reagents. Background Art
[0002] Protective equipment includes gas masks, respirators, etc., which are characterized by their ability to filter out tiny aerosol particles and chemical reagents, such as the chemical protection time of filters against aqueous reagents. Their ability to protect against aqueous reagents (i.e. protective performance) is one of the most important indicators for evaluating the performance of protective equipment.
[0003] In the prior art, when testing the protection performance of filter elements against aqueous reagents, most of them are mainly tested using orifice flowmeters, and the stability of the flow in the test system is mainly guaranteed by the stability of the air compressor pressure and manual adjustment. However, the stability of the existing air compressor outlet pressure is relatively poor, and it is difficult to meet the test requirements. The test personnel need to make real-time adjustments to ensure the stability of the flow. The labor intensity of the test personnel is high and the flow stability during the test is poor. Secondly, the humidity of the aqueous reagent in the existing test device is generated by using a humidity tank. A group of glass tubes are filled with air or concentrated sulfuric acid, and a group of glass tubes are filled with water. The humidity is adjusted by manually adjusting the air flow rate entering the air (concentrated sulfuric acid) glass tube and the water glass tube through the humidity tank. However, this adjustment method cannot be quantitative, and it depends entirely on the experience of the test personnel. The test repeatability is poor, and the preparation time before the test is relatively long. In addition, when conducting the protection performance test of the filter element, the entire test process must be carried out at a wind speed of not less than 0.7 The test was carried out in an exhaust system with a flow rate of m / s. Due to the fast circulation of air inside and outside, air conditioning and other environmental temperature control equipment could not maintain the temperature in the exhaust system (fume hood) within the test requirements in the morning and evening in winter, and the accuracy of the test results was low.
[0004] There are also related studies in the prior art on test devices prepared based on flow control methods such as mass flow controllers. However, since some aqueous reagents are extremely corrosive, they may cause damage to components such as mass flow controllers, thereby affecting the accuracy of measurement results and limiting their application. Summary of the invention
[0005] In order to solve the above-mentioned problem of the existing testing device for detecting the protection performance of the filter element against aqueous reagents, the present invention provides a new testing device for detecting the protection performance of the filter element against aqueous reagents.
[0006] The present invention is achieved by adopting the following technical solutions: A testing device for testing the protection performance of a filter element against aqueous reagents, comprising a humidity generating pipeline, a first protection detection pipeline, a second protection detection pipeline, an original concentration detection pipeline, a reagent input pipeline, and a total mixer; A mass flow controller, an airflow temperature control unit, a humidity adjustment unit, and a temperature and humidity sensor are sequentially arranged on the humidity generating pipeline. The humidity adjustment unit includes a regulating valve, a rotor flowmeter, and a humidity generator. The humidity generator includes a water tank with a heating system and a dry-wet mixer. The flow output end of the mass flow controller is connected with the input end of the airflow temperature control unit. The output end of the airflow temperature control unit is divided into two paths. One path is connected with the dry air inlet of the dry-wet mixer through the rotor flowmeter, and the other path extends into the water tank through the regulating valve and a bubbling head is arranged at the extension port. The water vapor outlet of the water tank is connected with the wet gas inlet of the dry-wet mixer, and the outlet of the dry-wet mixer is connected with the inlet of the temperature and humidity sensor. The moisture inlet of the total mixer is connected to the outlet of the temperature and humidity sensor. The outlet of the total mixer is divided into three routes, two of which are respectively connected to the pipeline inlet of the first protection detection pipeline and the pipeline inlet of the second protection detection pipeline, and the other is connected to the pipeline inlet of the original concentration detection pipeline. The reagent inlet of the total mixer is connected to the pipeline outlet of the reagent input pipeline; The first protection detection pipeline is provided with a first flow control valve and a first orifice flow meter in sequence, and the first flow control valve is located between the first orifice flow meter and the outlet of the total mixer; A second flow control valve and a second orifice flow meter are sequentially arranged on the second protection detection pipeline, and the second flow control valve is located between the first orifice flow meter and the outlet of the total mixer; A third flow control valve and a third orifice flow meter are arranged in sequence on the original concentration detection pipeline, and the third flow control valve is located between the third orifice flow meter and the outlet of the total mixer; A fourth flow control valve and a fourth orifice flow meter are arranged in sequence on the reagent input pipeline, and the fourth orifice flow meter is located between the reagent inlet of the total mixer and the reagent outlet of the fourth flow control valve.
[0007] When in use, the outlet end of the first orifice flowmeter is connected to the inlet end of the filter element, and clean air is introduced into the flow input end of the mass flow controller. The clean air is heated to the required temperature by the air flow temperature control unit and then divided into two paths. One path of clean air enters the water tank through the regulating valve, and the water vapor is brought out through the bubbling head. The water vapor brought out enters the dry-wet mixer. The other path of clean air also enters the dry-wet mixer through the rotor flowmeter and mixes with the water vapor entering it, and then enters the total mixer through the temperature sensor. When the humidity is adjusted, the temperature and humidity of the water temperature are tested by the temperature and humidity sensor, and the saturated vapor pressure of the water is adjusted by adjusting the ratio of the dry and wet airflows entering the water tank and the rotor flowmeter. At the same time, the water temperature in the water tank is adjusted by the heating system of the water tank to adjust the water temperature, thereby controlling the relative humidity of the water vapor until the water vapor humidity reaches the required humidity. After the temperature is reached, the reagent input pipeline inlet is connected to the reagent cylinder to introduce the reagent, and its flow is regulated by the fourth flow control valve and then passes through the fourth orifice flowmeter to enter the total mixer. The total mixer mixes the reagent and water vapor to form an aqueous reagent. One path of the total mixer outlet enters the first orifice flowmeter through the first flow control valve and then enters the filter element. The gas discharged from the filter element outlet is tested for protective concentration. The other path of the total mixer outlet enters the second orifice flowmeter through the second flow control valve and then enters the filter element. The gas discharged from the filter element outlet is tested for protective concentration. The other path of the total mixer outlet enters the third orifice flowmeter through the third flow control valve. The gas discharged from the third orifice flowmeter is tested for original concentration, thereby realizing the test of the filter element and the filter element for the protective performance of aqueous reagents.
[0008] During the specific implementation, the humidity generating pipeline, protection detection pipeline, original concentration detection pipeline, reagent input pipeline, total mixer, filter element, and filter element are all placed in a constant temperature box to ensure that the test temperature is consistent with the test requirements, avoid the problem of temperature gradient in the pipeline due to fast air flow velocity and slow heat exchange in the pipeline, and improve the accuracy of the measurement results.
[0009] During specific implementation, a mixing fan is provided in the constant temperature box to keep the temperature in the box consistent, thereby further improving the accuracy of the measurement results.
[0010] In specific implementation, the temperature control accuracy of the heating system on the water tank is ±0.2°C, which further improves the measurement accuracy.
[0011] During specific implementation, the temperature control accuracy of the constant temperature box is not less than 0.5°C, which further improves the measurement accuracy.
[0012] In specific implementation, the overall material of the total mixer is polytetrafluoroethylene and it is assembled by bolt connection using a split structure. Compared with the previous method of using glass material and melting it in one piece during processing, this structure is more convenient to process and disassemble.
[0013] The beneficial effects of the present invention are as follows: 1) A mass flow controller is arranged at the front end of the device to control the total flow entering the device. The flow can be stabilized without airflow pressure stabilization, and the flow is diverted by valves in various ways, without manual real-time flow control; 2) The present invention quantifies the dry-wet airflow ratio and clarifies the humidification temperature through a humidity adjustment unit, which greatly improves the humidity adjustment efficiency, and the humidity fluctuation is no more than 2%RH, which improves the repeatability of humidity adjustment during the test and reduces the preparation time before the test; 3) The present invention uses a constant temperature box design so that the test device can carry out tests every morning and evening in winter, which improves the stability of the test environment during the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0016] Figure 1 It is a schematic diagram of the overall structure of the testing device described in the present invention; Figure 2 is a structural schematic diagram of a humidity adjustment unit; Figure 3 This is a schematic diagram of the structure of the total mixer.
[0017] In the figure: 1-mass flow controller, 2-air flow temperature control unit, 3-regulating valve, 4-humidity generator, 41-bubble head, 42-dry-wet mixer, 43-water tank, 5-temperature and humidity sensor, 6-rotor flowmeter, 7-reagent cylinder, 8-fourth flow control valve, 9-fourth orifice flowmeter, 10-total mixer, 11-third flow control valve, 12-third orifice flowmeter, 13-first flow control valve, 14-first orifice flowmeter, 15-filter, 16-second flow control valve, 17-second orifice flowmeter, 18-filter, 19-constant temperature box. DETAILED DESCRIPTION
[0018] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0019] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0021] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0022] like Figure 1 , 2 , 3, a testing device for detecting the protection performance of a filter element against aqueous reagents, comprising a humidity generating pipeline, a first protection detection pipeline, a second protection detection pipeline, an original concentration detection pipeline, a reagent input pipeline, and a total mixer 10; A mass flow controller 1, an airflow temperature control unit 2, a humidity adjustment unit, and a temperature and humidity sensor 5 are sequentially arranged on the humidity generating pipeline. The humidity adjustment unit includes a regulating valve 3, a rotor flowmeter 6, and a humidity generator 4. The humidity generator 4 includes a water tank 43 with a heating system and a dry-wet mixer 42. The flow output end of the mass flow controller 1 is connected to the input end of the airflow temperature control unit 2. The output end of the airflow temperature control unit 2 is divided into two paths. One path is connected to the dry air inlet of the dry-wet mixer 42 through the rotor flowmeter 6, and the other path is extended into the water tank 43 through the regulating valve 3 and a bubbling head 41 is provided at the extension port. The water vapor outlet of the water tank 43 is connected to the wet gas inlet of the dry-wet mixer 42, and the outlet of the dry-wet mixer 42 is connected to the inlet of the temperature and humidity sensor 5. The moisture inlet of the total mixer 10 is connected to the outlet of the temperature and humidity sensor 5. The outlet of the total mixer 10 is divided into three routes, two of which are respectively connected to the pipeline inlet of the first protection detection pipeline and the pipeline inlet of the second protection detection pipeline, and the other is connected to the pipeline inlet of the original concentration detection pipeline. The reagent inlet of the total mixer 10 is connected to the pipeline outlet of the reagent input pipeline; The first protection detection pipeline is provided with a first flow control valve 13 and a first orifice flow meter 14 in sequence, and the first flow control valve 13 is located between the first orifice flow meter 14 and the outlet of the total mixer 10; A second flow control valve 16 and a second orifice flow meter 17 are sequentially arranged on the second protection detection pipeline, and the second flow control valve 16 is located between the first orifice flow meter 17 and the outlet of the total mixer 10; A third flow control valve 11 and a third orifice flow meter 12 are sequentially arranged on the original concentration detection pipeline, and the third flow control valve 11 is located between the third orifice flow meter 12 and the outlet of the total mixer 10; A fourth flow control valve 8 and a fourth orifice flowmeter 9 are sequentially arranged on the reagent input pipeline. The fourth orifice flowmeter 9 is located between the reagent inlet of the total mixer 10 and the reagent outlet of the fourth flow control valve 8 .
[0023] When in use, the outlet end of the first orifice flowmeter 14 is connected to the inlet of the filter element 15, and clean air is introduced into the flow input end of the mass flow controller 1. The clean air is heated to the required temperature by the airflow temperature control unit 2 and then divided into two paths. One path of clean air passes through the regulating valve 3 and enters the water tank 43, and the water vapor is brought out through the bubbling head 41. The water vapor brought out enters the dry-wet mixer 42. The other path of clean air also enters the dry-wet mixer 42 through the rotor flowmeter 6 and mixes with the water vapor entering it, and then enters the main mixer 10 through the temperature and humidity sensor 5. When the humidity is adjusted, the temperature and humidity of the water temperature are tested by the temperature and humidity sensor 5, and the saturated vapor pressure of the water is adjusted by adjusting the ratio of the dry and wet airflows entering the water tank 43 and the rotor flowmeter 6. At the same time, the water temperature in the water tank 43 is adjusted by the heating system of the water tank 43 to adjust the saturated vapor pressure of the water, thereby controlling the relative humidity of the water vapor. After the water vapor humidity reaches the required humidity, the reagent is added. The pipeline inlet of the input pipeline is connected to the reagent cylinder 7, that is, the reagent is introduced. After the flow rate is regulated by the fourth flow control valve 8, it passes through the fourth orifice flowmeter 9 and then enters the main mixer 10. The main mixer 10 mixes the reagent and water vapor to form an aqueous reagent. One path of the outlet of the main mixer 10 enters the first orifice flowmeter 14 through the first flow control valve 13, and then enters the filter element 15. The gas discharged from the outlet of the filter element 15 is tested for protective concentration. The other path of the outlet of the main mixer 10 enters the second orifice flowmeter 17 through the second flow control valve 16, and then enters the filter element 18. The gas discharged from the outlet of the filter element 18 is tested for protective concentration. The other path of the outlet of the main mixer 10 enters the third orifice flowmeter 12 through the third flow control valve 11, and the gas discharged from the third orifice flowmeter 12 is tested for original concentration, thereby realizing the test of the protective performance of the filter elements 18 and 15 on the aqueous reagent.
[0024] During specific implementation, the humidity generating pipeline, the protection detection pipeline, the original concentration detection pipeline, the reagent input pipeline, the total mixer 10, the filter 15, and the filter 18 are all placed in a constant temperature box 19 to ensure that the test temperature is consistent with the test requirements, avoid the problem of temperature gradient in the pipeline due to fast air flow velocity and slow heat exchange in the pipeline, and improve the accuracy of the measurement results.
[0025] During specific implementation, a mixing fan is provided in the constant temperature box 19 to keep the temperature in the box consistent, thereby further improving the accuracy of the measurement results.
[0026] In specific implementation, the temperature control accuracy of the heating system on the water tank 43 is ±0.2° C., which further improves the measurement accuracy.
[0027] In specific implementation, the temperature control accuracy of the constant temperature box 19 is not less than 0.5° C., which further improves the measurement accuracy.
[0028] In specific implementation, the overall material of the total mixer 10 is polytetrafluoroethylene and it is assembled by bolt connection using a split structure. Compared with the previous method of using glass material and melting it in one piece during processing, this structure is more convenient to process and disassemble.
[0029] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A testing device for detecting the protection performance of a filter element against aqueous reagents, characterized in that: It includes a humidity generating pipeline, a protection detection pipeline, an original concentration detection pipeline, a reagent input pipeline, and a total mixer (10); A mass flow controller (1), an airflow temperature control unit (2), a humidity adjustment unit, and a temperature and humidity sensor (5) are sequentially arranged on the humidity generating pipeline. The humidity adjustment unit comprises a regulating valve (3), a rotor flow meter (6), and a humidity generator (4). The humidity generator (4) comprises a water tank (43) with a heating system and a dry-wet mixer (42). The flow output end of the mass flow controller (1) is connected to the input end of the airflow temperature control unit (2). The output end of the airflow temperature control unit (2) is divided into two paths. One path is connected to the dry air inlet of the dry-wet mixer (42) through the rotor flow meter (6). The other path is extended into the water tank (43) through the regulating valve (3). A bubbling head (41) is provided at the extension port. The water vapor outlet of the water tank (43) is connected to the wet gas inlet of the dry-wet mixer (42). The outlet of the dry-wet mixer (42) is connected to the inlet of the temperature and humidity sensor (5). The moisture inlet of the total mixer (10) is connected to the outlet of the temperature and humidity sensor (5); the outlet of the total mixer (10) is divided into three paths, two of which are respectively connected to the pipeline inlet of the first protection detection pipeline and the pipeline inlet of the second protection detection pipeline, and the other is connected to the pipeline inlet of the original concentration detection pipeline; the reagent inlet of the total mixer (10) is connected to the pipeline outlet of the reagent input pipeline; A first flow control valve (13) and a first orifice flow meter (14) are sequentially provided on the first protection detection pipeline, and the first flow control valve (13) is located between the first orifice flow meter (14) and the outlet of the main mixer (10); A second flow control valve (16) and a second orifice flow meter (17) are sequentially provided on the second protection detection pipeline, and the second flow control valve (16) is located between the first orifice flow meter (17) and the outlet of the main mixer (10); A third flow control valve (11) and a third orifice flow meter (12) are sequentially provided on the original concentration detection pipeline, and the third flow control valve (11) is located between the third orifice flow meter (12) and the outlet of the total mixer (10); A fourth flow control valve (8) and a fourth orifice flow meter (9) are sequentially arranged on the reagent input pipeline, and the fourth orifice flow meter (9) is located between the reagent inlet of the main mixer (10) and the reagent outlet of the fourth flow control valve (8).
2. A testing device for detecting the protection performance of a filter element against aqueous reagents according to claim 1, characterized in that: The humidity generating pipeline, the protection detection pipeline, the original concentration detection pipeline, the reagent input pipeline, the total mixer (10), the filter element (15) and the filter element (18) are all placed in a constant temperature box (19).
3. A testing device for detecting the protection performance of a filter element against aqueous reagents according to claim 2, characterized in that: A mixing fan is provided in the thermostatic box (19).
4. A testing device for detecting the protection performance of a filter element against aqueous reagents according to claim 3, characterized in that: The temperature control accuracy of the heating system on the water tank (43) is ±0.2°C.
5. A testing device for detecting the protection performance of a filter element against aqueous reagents according to claim 4, characterized in that: The temperature control accuracy of the thermostat (19) is not less than 0.5°C.
6. A testing device for detecting the protection performance of a filter element against aqueous reagents according to claim 5, characterized in that: The overall material of the total mixer (10) is polytetrafluoroethylene and is assembled by bolt connection using a split structure.