CN211179437U - Interference removing device of β ray particulate matter monitor - Google Patents
Interference removing device of β ray particulate matter monitor Download PDFInfo
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- CN211179437U CN211179437U CN201921581637.9U CN201921581637U CN211179437U CN 211179437 U CN211179437 U CN 211179437U CN 201921581637 U CN201921581637 U CN 201921581637U CN 211179437 U CN211179437 U CN 211179437U
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Abstract
The interference removing device comprises a shell, a heating sheet, a refrigerating sheet, a temperature sensor, a humidity processing unit, and a control unit, wherein the shell is internally provided with a closed cavity, the sampling mechanism and a sampling platform are positioned in the cavity, the shell comprises a sampling port, an air inlet and an air outlet which are communicated with the cavity, a sampling pipe of the sampling mechanism extends out of the sampling port, the heating sheet is positioned in the cavity and used for heating, the refrigerating sheet is positioned in the cavity and used for refrigerating, the temperature sensor is positioned in the cavity and used for detecting the temperature in the cavity, the humidity sensor is positioned in the cavity and used for detecting the humidity in the cavity, the humidity processing unit is connected with the air inlet and the air outlet of the shell and used for humidifying or dehumidifying the gas in the cavity, and the control unit is respectively connected with the heating sheet, the refrigerating sheet, the temperature sensor, the humidity sensor and the humidity processing unit.
Description
Technical Field
The utility model belongs to the technical field of monitoring facilities, especially, relate to a interference removing device of β ray particulate matter monitor.
Background
The common monitoring methods of the atmospheric particulate matter include a manual weighing method, an β ray absorption method and a vibration microbalance method, wherein, the β ray absorption method is that after β rays penetrate through a substance to be measured, the intensity attenuation degree of the ray absorption method is only related to the mass of the penetrated substance and is not related to the physical and chemical properties of the penetrated substance.
β ray absorption method has the advantages of small sample amount, automatic obtaining of monitoring data per hour, real-time reflection of change of particulate matter concentration in air, data transmission, remote monitoring and automatic control, and greatly reduced manual work load, so β ray method has become one of the main measuring methods of continuous automatic monitor for particulate matter concentration in atmospheric environment
SUMMERY OF THE UTILITY MODEL
The utility model provides an interference removing device and method of β ray particulate matter monitor, can carry out constant temperature and humidity control to the sampling platform, get rid of the interference of temperature, humidity.
The embodiment of this disclosure provides an interference elimination device of β ray particulate matter monitor, β ray particulate matter monitor includes sampling mechanism and sampling platform, interference elimination device includes:
the sampling device comprises a shell, a sampling mechanism and a sampling platform, wherein the shell is internally provided with a closed cavity, the sampling mechanism and the sampling platform are positioned in the cavity, the shell comprises a sampling port, an air inlet and an air outlet which are communicated with the cavity, and a sampling pipe of the sampling mechanism extends out of the sampling port;
the heating sheet is positioned in the cavity and used for heating;
the refrigerating sheet is positioned in the cavity and used for refrigerating;
a temperature sensor located within the cavity for detecting a temperature within the cavity;
the humidity sensor is positioned in the cavity and used for detecting the humidity in the cavity;
the humidity processing unit is connected with the air inlet and the air outlet of the shell and is used for humidifying or dehumidifying the air in the cavity;
and the control unit is respectively connected with the heating plate, the refrigerating plate, the temperature sensor, the humidity sensor and the humidity processing unit.
According to some embodiments of the present disclosure, the humidity processing unit includes a control valve, a dehumidifier, a humidifier, and an air pump; the air outlet of the shell is connected with the air inlet of the control valve; a first air outlet of the control valve is connected with an air inlet of the dehumidifier, and a second air outlet of the control valve is connected with an air inlet of the humidifier; the air outlet of the dehumidifier is connected with the air inlet of the air pump; the air outlet of the humidifier is connected with the air inlet of the air pump; the air outlet of the air pump is connected with the air inlet of the shell; the control valve, the dehumidifier, the humidifier and the air pump are respectively connected with the control unit.
According to some embodiments of the present disclosure, the humidity processing unit includes a water storage tank; the dehumidifier comprises a refrigeration module and a condensation pipeline, the refrigeration module is installed on the outer wall of the condensation pipeline, the condensation pipeline comprises an air inlet, an air outlet and a water outlet, a first air outlet of the control valve is connected with the air inlet of the condensation pipeline, the air outlet of the condensation pipeline is connected with the air inlet of the air pump, and the water outlet of the condensation pipeline is connected with the water inlet of the water storage tank.
According to some embodiments of the present disclosure, the humidifier includes steam generator and humidification pipeline, the humidification pipeline includes air inlet, gas outlet and steam inlet, the delivery port of water storage tank is connected the water inlet of steam generator, steam generator's steam outlet connects the steam inlet of humidification pipeline, the second gas outlet of control valve is connected the air inlet of humidification pipeline, the gas outlet of humidification pipeline is connected the air inlet of air pump.
According to some embodiments of the present disclosure, the heating plate, the cooling plate, the temperature sensor and the humidity sensor are all installed on the sampling platform.
According to some embodiments of the present disclosure, the upper surfaces of the heating plate and the cooling plate are located 2-5 mm below the upper surface of the sampling platform.
An embodiment of the present disclosure further provides a method for removing interference by using the interference removing device, including:
the temperature sensor detects the temperature in the cavity and sends the detected temperature value to the control unit; if the detected temperature value is lower than a preset temperature value, the control unit controls the heating sheet to heat; if the detected temperature value is higher than a preset temperature value, the control unit controls the refrigerating sheet to refrigerate;
the humidity sensor detects the humidity in the cavity and sends a detected humidity value to the control unit; if the detected humidity value is higher than a preset humidity value, the control unit controls the humidity processing unit to perform dehumidification processing on the gas in the cavity; and if the detected humidity value is lower than a humidity preset value, the control unit controls the humidity processing unit to perform humidification processing on the gas in the cavity.
According to some embodiments of the present disclosure, if the detected humidity value is higher than a preset humidity value, the controlling unit controls the humidity processing unit to perform a dehumidification process on the gas in the cavity, including: starting an air pump, wherein air in the cavity enters the dehumidifier through the control valve, the dehumidifier dehumidifies the air, and the dehumidified air enters the cavity through the air pump;
if the detected humidity value is lower than the preset humidity value, the control unit controls the humidity processing unit to perform humidification processing on the gas in the cavity, and the humidification processing method comprises the following steps: and starting the air pump, enabling the air in the cavity to enter the humidifier through the control valve, humidifying the air by the humidifier, and enabling the humidified air to enter the cavity through the air pump.
According to some embodiments of the present disclosure, the water produced by dehumidifying the gas enters a water storage tank for storage.
According to some embodiments of the present disclosure, water in the water storage tank enters a steam generator to generate steam, and the steam enters a humidifying pipeline to humidify the gas.
According to the interference removing device and method, the sampling platform is sealed in the shell, the temperature sensor and the humidity sensor in the cavity of the shell can detect the temperature and the humidity in the cavity, the temperature and the humidity in the cavity are ensured to be preset values through the matching of the heating sheet, the refrigerating sheet and the humidity processing unit, and the final monitoring accuracy of the β ray particulate matter monitor is improved.
Drawings
Fig. 1 is a schematic structural diagram of an interference elimination device of an β ray particulate matter monitor according to an embodiment of the disclosure.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or otherwise in communication with one another; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Example embodiments of the present disclosure are described below with reference to the accompanying drawings, and it is to be understood that the example embodiments described herein are merely for purposes of illustrating and explaining the present disclosure and are not to be taken as limiting the present disclosure
Specifically, the humidity affects the counting of the filter paper tape at the same position before and after sampling, when the humidity is high, the filter paper tape absorbs water vapor to cause counting reduction, on the other hand, the attached particulate matters absorb water vapor to cause counting reduction, the measuring result is larger and deviates from the actual condition.
At present, in the existing online β ray method particulate matter monitor, a device for realizing constant temperature and humidity control on a sampling platform is not provided, the condition consistency with a manual weighing method cannot be ensured, and the influence caused by high temperature and high humidity cannot be removed, so that the monitoring data is inaccurate.
As shown in FIG. 1, the embodiment of the present disclosure provides an interference elimination device for a β ray particulate matter monitor, the β ray particulate matter monitor comprises a sampling mechanism 310 and a sampling platform 320, the sampling mechanism 310 and the sampling platform 320 cooperate to enable particulate matters in sample gas to be deposited on a filter paper tape, and the concentration of the particulate matters is monitored through β rays, in addition, the β ray particulate matter monitor further comprises a filter paper tape winding and unwinding wheel 330, the filter paper tape winding and unwinding wheel 330 drives the filter paper tape to move, and the interference elimination device comprises a housing 110, a heating sheet 120, a refrigerating sheet 130, a temperature sensor 140, a humidity sensor 150, a humidity processing unit 200 and a control unit (not shown in the figure).
The housing 110 has a closed cavity 114 therein, and the housing 110 is provided with a sampling port 111, an air inlet 112 and an air outlet 113 which are communicated with the cavity 114. Sampling mechanism 310 and sampling platform 320 are located within cavity 114. The sampling port 111 is located at the top end of the shell 110, and the sampling tube 311 of the sampling mechanism extends out of the sampling port 111 and is used for collecting sample gas in the environment. The air inlet 112 and the air outlet 113 are located at both sides of the housing 110, respectively. The housing 110 further includes a sample gas outlet through which the sample gas having absorbed the particulate matter through the filter paper is discharged. Optionally, a filter paper tape take-up and pay-off wheel 330 is also located within the cavity 114.
A heat patch 120 is positioned within the cavity 114 for heating, and if the temperature within the cavity 114 is below the temperature required for monitoring, the heat patch 120 is activated to heat the cavity 114. The cooling plate 130 is located in the cavity 114 for cooling, and if the temperature in the cavity 114 is higher than the temperature required for monitoring, the cooling plate 130 is started to cool the cavity 114. The heating plate 120 and the cooling plate 130 may be an existing heating plate and cooling plate.
A temperature sensor 140 is located within the cavity 114 for sensing the temperature within the cavity 114. A humidity sensor 150 is located within the cavity 114 for sensing humidity within the cavity 114. The temperature sensor 140 and the humidity sensor 150 may be an existing temperature sensor and humidity sensor.
The humidity processing unit 200 is located outside the housing 110, and is connected to the air inlet 112 and the air outlet 113 of the housing. The gas in the cavity 114 enters the humidity processing unit 200 through the gas outlet 113, the humidity processing unit 200 humidifies or dehumidifies the gas, and the processed gas enters the cavity 114 through the gas inlet 112, so that the gas in the cavity 114 is humidified or dehumidified.
The control unit is respectively connected to the heating plate 120, the cooling plate 130, the temperature sensor 140, the humidity sensor 150 and the humidity processing unit 200, and is used for controlling each component. The control unit comprises a processing module (which can be an MCU) and a storage module. The temperature information collected by the temperature sensor 140 and the humidity information collected by the humidity sensor 150 are sent to the control unit, and the processing module executes control over the heating plate 120, the cooling plate 130 and the humidity processing unit 200 according to the program stored in the storage module.
If the temperature value in the cavity 114 detected by the temperature sensor 140 is lower than the preset temperature value, the control unit controls the heating sheet 120 to heat. If the temperature value in the cavity 114 detected by the temperature sensor 140 is higher than the preset temperature value, the control unit controls the cooling plate 130 to cool.
If the humidity sensor 150 detects that the humidity value of the cavity is higher than the preset humidity value, the control unit controls the humidity processing unit 200 to perform dehumidification processing on the gas in the cavity. If the humidity sensor 150 detects that the humidity value of the cavity is lower than the preset humidity value, the control unit controls the humidity processing unit 200 to perform humidification processing on the gas in the cavity.
The interference removing device of the embodiment seals the sampling platform 320 in the housing 110, the temperature sensor 140 and the humidity sensor 150 in the housing cavity 114 can detect the temperature and the humidity in the cavity 114, and the temperature and the humidity in the cavity are ensured to be preset values through the matching of the heating sheet 120, the refrigerating sheet 130 and the humidity processing unit 200, so that the final monitoring accuracy of the β ray particulate matter monitor is improved.
According to an example aspect of the present disclosure, the humidity processing unit 200 includes a control valve 210, a dehumidifier 220, a humidifier 230, and a gas pump 240. The control valve 210 in this embodiment is a two-position three-way valve, which includes a gas inlet, a first gas outlet, and a second gas outlet, and is used to control the flow direction of the gas. The air outlet 113 of the housing is connected to the air inlet of the control valve 210. A first air outlet of the control valve 210 is connected with an air inlet of the dehumidifier 220, and a second air outlet of the control valve 210 is connected with an air inlet of the humidifier 230. The air outlet of the dehumidifier 220 is connected to the air inlet of the air pump 240, and the air outlet of the humidifier 230 is connected to the air inlet of the air pump 240. The air outlet of the air pump 240 is connected to the air inlet 112 of the housing.
The control valve 210, the dehumidifier 220, the humidifier 230, and the air pump 240 are connected to the control unit, respectively. In operation, the control unit controls the air pump 240 to start to pump out the air in the cavity 114, the control valve 210 controls the air to enter the dehumidifier 220 or the humidifier 230, and the dehumidified or humidified air is sent to the cavity 114 by the air pump 240.
According to an exemplary aspect of the present disclosure, the humidity treating unit 200 further includes a water storage tank 251. The dehumidifier 220 includes a refrigeration module 221 and a condensation line 222, and the refrigeration module 221 is installed on an outer wall of the condensation line 222. The control unit controls the operation of the refrigeration module 221. The refrigeration module 221 of the present embodiment may be a semiconductor refrigeration chip. The refrigeration module 221 cools the condensation line 222, so that water in the gas passing through the condensation line 222 is changed into liquid water, and the humidity of the gas is reduced. The condensing pipeline 222 comprises an air inlet, an air outlet and an water outlet, the first air outlet of the control valve 210 is connected to the air inlet of the condensing pipeline 222, the air outlet of the condensing pipeline 222 is connected to the air inlet of the air pump 240, and the water outlet of the condensing pipeline 222 is connected to the water inlet of the water storage tank 251.
The gas in the cavity 114 enters the dehumidifier 220 through the control valve 210 to be dehumidified. The dehumidified gas enters the cavity 114 through the air pump 240, and the water produced by dehumidification enters the water storage tank 251 through the water outlet of the condensation pipeline 222.
Further, the humidifier 230 includes a steam generator 231 and a humidification line 232. The control unit controls the operation of the steam generator 231. The water outlet of the water storage tank 251 is connected to the water inlet of the steam generator 231, the humidifying pipeline 232 comprises an air inlet, an air outlet and a steam inlet, the steam outlet of the steam generator 231 is connected to the steam inlet of the humidifying pipeline 232, the second air outlet of the control valve 210 is connected to the air inlet of the humidifying pipeline 232, and the air outlet of the humidifying pipeline 232 is connected to the air inlet of the air pump 240.
The water outlet of the water storage tank 251 is connected with the water inlet of the steam generator 231 through a two-position two-way valve 252, and the two-position two-way valve 252 controls the starting and stopping of the water flow. The control unit controls the two-position two-way valve 252.
The gases within the cavity 114 enter the humidifier 230 through the control valve 210 for humidification. After entering the steam generator 231, the water in the water storage tank 251 is electrically heated to generate steam, and the steam enters the humidifying pipeline 232 to be mixed with the gas in the humidifying pipeline 232, so as to humidify the gas. The humidified gas enters the cavity 114 via the gas pump 240.
In this embodiment, the dehumidifier 220 is connected to the air inlet of the air pump 240 through a one-way valve 261, and the humidifier 230 is connected to the air inlet of the air pump 240 through a one-way valve 262.
According to an example aspect of the present disclosure, the heating plate 120, the cooling plate 130, the temperature sensor 140, and the humidity sensor 150 are all mounted on the sampling platform 320. The heating plate 120, the refrigerating plate 130, the temperature sensor 140 and the humidity sensor 150 are arranged on the platform, so that the temperature and the humidity near the sampling platform can be accurately controlled, and the accuracy of a monitoring result is improved.
Further, the upper surfaces of the heating plate 120 and the refrigerating plate 130 are located 2-5 mm below the upper surface of the sampling platform. Optionally, the temperature sensor 140 and the humidity sensor 150 are located 2-5 mm below the upper surface.
The embodiment of the present disclosure also provides a method for removing interference by using the above interference removing device, including:
the temperature sensor 140 detects the temperature within the cavity 114 and sends the detected temperature value to the control unit. The control unit compares the detected temperature value with a preset temperature value (e.g., 25 c). If the detected temperature value is lower than the preset temperature value, the control unit controls the heating sheet to heat; and if the detected temperature value is higher than the preset temperature value, the control unit controls the refrigerating sheet to refrigerate.
The humidity sensor 150 detects the humidity within the cavity 114 and transmits the detected humidity value to the control unit. The control unit compares the detected humidity value with a preset humidity value (such as 50% relative humidity). If the detected humidity value is higher than the humidity preset value, the control unit controls the humidity processing unit to perform dehumidification processing on the gas in the cavity; if the detected humidity value is lower than the humidity preset value, the control unit controls the humidity processing unit to perform humidification processing on the gas in the cavity.
According to an exemplary technical solution of the present disclosure, if the detected humidity value is higher than the humidity preset value, the controlling unit controls the humidity processing unit to perform dehumidification processing on the gas in the cavity, including: the air pump 240 is started, the air in the cavity 114 enters the dehumidifier 220 through the control valve 210, the dehumidifier 220 dehumidifies the air, and the dehumidified air enters the cavity 114 through the air pump 240.
If the detected humidity value is lower than the humidity preset value, the control unit controls the humidity processing unit to perform humidification processing on the gas in the cavity, and the humidification processing method comprises the following steps: the gas pump 240 is started, the gas in the cavity 114 enters the humidifier 230 through the control valve 210, the humidifier 230 humidifies the gas, and the humidified gas enters the cavity 114 through the gas pump 240.
According to an exemplary embodiment of the present disclosure, water generated by dehumidifying gas enters the water storage tank 251 to be stored.
According to an example technical scheme of the present disclosure, water in the water storage tank 251 enters the steam generator 231 to generate steam, and the steam enters the humidifying pipeline 232 to humidify the gas. The water storage tank 251 is utilized to realize the recycling of water generated by dehumidification, and the energy-saving and environment-friendly effects are realized.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (6)
1. An interference elimination apparatus of β ray particulate matter monitor, β ray particulate matter monitor includes sampling mechanism and sampling platform, its characterized in that, interference elimination apparatus includes:
the sampling device comprises a shell, a sampling mechanism and a sampling platform, wherein the shell is internally provided with a closed cavity, the sampling mechanism and the sampling platform are positioned in the cavity, the shell comprises a sampling port, an air inlet and an air outlet which are communicated with the cavity, and a sampling pipe of the sampling mechanism extends out of the sampling port;
the heating sheet is positioned in the cavity and used for heating;
the refrigerating sheet is positioned in the cavity and used for refrigerating;
a temperature sensor located within the cavity for detecting a temperature within the cavity;
the humidity sensor is positioned in the cavity and used for detecting the humidity in the cavity;
the humidity processing unit is connected with the air inlet and the air outlet of the shell and is used for humidifying or dehumidifying the air in the cavity;
and the control unit is respectively connected with the heating plate, the refrigerating plate, the temperature sensor, the humidity sensor and the humidity processing unit.
2. The interference removing device as claimed in claim 1, wherein the humidity processing unit comprises a control valve, a dehumidifier, a humidifier and an air pump;
the air outlet of the shell is connected with the air inlet of the control valve;
a first air outlet of the control valve is connected with an air inlet of the dehumidifier, and a second air outlet of the control valve is connected with an air inlet of the humidifier;
the air outlet of the dehumidifier is connected with the air inlet of the air pump;
the air outlet of the humidifier is connected with the air inlet of the air pump;
the air outlet of the air pump is connected with the air inlet of the shell;
the control valve, the dehumidifier, the humidifier and the air pump are respectively connected with the control unit.
3. The interference elimination device of claim 2 wherein the moisture management unit comprises a water storage tank;
the dehumidifier comprises a refrigeration module and a condensation pipeline, the refrigeration module is installed on the outer wall of the condensation pipeline, the condensation pipeline comprises an air inlet, an air outlet and a water outlet, a first air outlet of the control valve is connected with the air inlet of the condensation pipeline, the air outlet of the condensation pipeline is connected with the air inlet of the air pump, and the water outlet of the condensation pipeline is connected with the water inlet of the water storage tank.
4. The interference removing device as claimed in claim 3, wherein the humidifier comprises a steam generator and a humidifying pipeline, the humidifying pipeline comprises an air inlet, an air outlet and a steam inlet, the water outlet of the water storage tank is connected to the water inlet of the steam generator, the steam outlet of the steam generator is connected to the steam inlet of the humidifying pipeline, the second air outlet of the control valve is connected to the air inlet of the humidifying pipeline, and the air outlet of the humidifying pipeline is connected to the air inlet of the air pump.
5. The interference elimination device of claim 1, wherein the heating plate, the cooling plate, the temperature sensor and the humidity sensor are all mounted on the sampling platform.
6. The interference removing device of claim 2, wherein the upper surfaces of the heating plate and the cooling plate are 2-5 mm below the upper surface of the sampling platform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921581637.9U CN211179437U (en) | 2019-09-20 | 2019-09-20 | Interference removing device of β ray particulate matter monitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921581637.9U CN211179437U (en) | 2019-09-20 | 2019-09-20 | Interference removing device of β ray particulate matter monitor |
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| CN211179437U true CN211179437U (en) | 2020-08-04 |
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