Air pressure balancing device for sand dust test box

Abstract

The utility model relates to an air pressure balancing device for a sand dust test box, which relates to the technical field of environment simulation test boxes and comprises a box body, the box body is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipe, the air inlet pipe is used for being connected with an air port of the test box, and a filter component used for separating the air inlet from the air outlet is arranged in the box body. During pressure relief, gas containing particulate matters enters the box body through the gas inlet pipe, the filter assembly is started to filter the gas, the filtered gas is discharged through the gas outlet, and when air needs to be supplemented, external air enters the box body through the gas outlet and is filtered by the filter assembly, and the filtered gas enters the test box through the gas inlet pipe. Therefore, the air pressure balance inside and outside the test box is realized, and the pressure relief and air supplement operations of the test box can be completed only through one device, so that the convenience of air pressure adjustment in the sand dust test is improved.

Description

Technical Field

[0001] This utility model relates to the field of environmental simulation test chamber technology, and in particular to a pressure balancing device for a sand and dust test chamber. Background Technology

[0002] The sand and dust test chamber, also known as the sandblasting test chamber, is mainly used to test the adaptability of electronic components, electronic products, circuit boards, controllers, switches, etc. to the environment of scattered sand and dust. The sand and dust test generally includes three types: sand blowing test, dust blowing test, and dust settling test. Existing technology has enabled electronic products to be tested simultaneously by sand blowing or sand settling.

[0003] In the sand and dust test, in order to improve the accuracy of environmental simulation and to balance the pressure inside and outside the test chamber, it is usually necessary to adjust the pressure inside and outside the test chamber. Since the gas inside the sand and dust test chamber contains particulate matter, direct discharge into the external environment will pollute the environment and affect human health. Therefore, the gas discharged from the sand and dust test chamber needs to be filtered.

[0004] The most common methods are to install filter bags at the gas outlet of the test chamber and filter cotton at the gas inlet of the test chamber. However, these two methods require frequent replacement of filter cotton and filter bags, which is cumbersome and reduces the convenience of air pressure adjustment in sand and dust tests. Utility Model Content

[0005] To improve the convenience of air pressure regulation in sand and dust tests, this utility model provides an air pressure balancing device for sand and dust test chambers.

[0006] This application provides a pressure balancing device for a sand and dust test chamber, which adopts the following technical solution:

[0007] A pressure balancing device for a sand and dust test chamber includes a chamber body with an air inlet and an air outlet. An air inlet pipe is connected to the air inlet and is used to connect to the gas port of the test chamber. A filter assembly is provided inside the chamber to isolate the air inlet and the air outlet.

[0008] By adopting the above technical solution, when the test chamber needs to be depressurized, the gas containing particulate matter enters the chamber through the air inlet pipe, the filter assembly is activated to filter the gas, and the filtered gas is discharged through the air outlet. When air needs to be replenished, external air enters the chamber through the air outlet and is filtered by the filter assembly. The filtered gas enters the test chamber through the air inlet pipe, thereby achieving air pressure balance inside and outside the test chamber. Only one device is needed to complete the depressurization and air replenishment operations of the test chamber, thus improving the convenience of air pressure regulation in sand and dust tests.

[0009] Optionally, the filtering component includes:

[0010] A dust collector filter element is disposed inside a housing. The dust collector filter element is cylindrical and has an air vent at the top. The air vent is connected to the air outlet. An air collection space is formed between the outer surface of the dust collector filter element and the inner wall of the housing. The air inlet pipe is connected to the air collection space. The dust collector filter element has a filtration space inside, and the filtration space is connected to the air vent.

[0011] Dustproof filter cotton, which is located between the air outlet and the air vent.

[0012] By adopting the above technical solution, during pressure relief, gas containing particulate matter enters the gas collection space through the inlet pipe. As gas is continuously introduced, the gas in the gas collection space is filtered by the dust removal filter element and then gathers in the filtration space. Subsequently, it moves through the air inlet to the dustproof filter cotton for secondary filtration. The filtered clean gas is discharged through the air outlet. The double filtration improves the cleanliness of the discharged gas, thereby improving the protection of the environment and operators. When replenishing air, the outside air first passes through the dustproof filter cotton and then enters the filtration space. After being filtered again by the dust removal filter element, it gathers in the gas collection space and enters the test chamber through the inlet pipe. This reduces the probability of pollutants in the outside air entering the test chamber, thereby improving the test effect of sand and dust test.

[0013] Optionally, the air inlet pipe includes a horizontal pipe and a connecting pipe. The horizontal pipe is located on the air inlet and extends horizontally to allow outside air to pass through. The connecting pipe is located on the horizontal pipe and communicates with the horizontal pipe to communicate with the gas port of the test chamber.

[0014] By adopting the above technical solution, during depressurization, the gas containing particulate matter enters the chamber through the gas inlet of the test chamber, the connecting pipe, and the horizontal pipe near one end of the chamber body for filtration. After prolonged depressurization, particulate matter easily accumulates at the connection between the inlet pipe and the horizontal pipe. At this time, external air is blown in through the end of the horizontal pipe away from the chamber body, and the accumulated particulate matter enters the chamber body under the action of the airflow, thereby reducing the probability of pipe blockage caused by particulate matter accumulation. This not only improves the purification effect of the discharged gas, but also reduces the probability of reduced gas filling efficiency due to pipe blockage when replenishing gas, thus improving the convenience of air pressure adjustment in sand and dust tests.

[0015] Optionally, the housing includes an outer shell and a cover plate covering the outer shell, the air inlet is located on the outer shell, the air outlet is located on the cover plate, and the top of the dust removal filter element is provided with a filter element chuck, which is located below the dustproof filter cotton and connected to the lower surface of the cover plate.

[0016] By adopting the above technical solution, when disassembling and replacing, a new dust collector filter element can be replaced simply by removing the cover plate and filter element chuck, thereby improving the convenience of dust collector filter element disassembly, replacement, and installation positioning.

[0017] Optionally, the cover plate is provided with an annular pressure plate, which presses against the dustproof filter cotton.

[0018] By adopting the above technical solution, the pressure plate positions the dustproof filter cotton, thereby improving the stability of the dustproof filter cotton.

[0019] Optionally, a sealing ring is provided between the dust collector filter element and the filter element chuck.

[0020] By adopting the above technical solution, the sealing ring increases the sealing performance between the dust collector filter element and the filter element chuck.

[0021] Optionally, the bottom of the housing is provided with leveling feet.

[0022] By adopting the above technical solution, the horizontal adjustment feet can adjust the overall structure of the enclosure, thereby improving the stability of the enclosure during use.

[0023] Optionally, the bottom of the housing is provided with a fixed bracket, and the horizontal adjustment feet are mounted on the fixed bracket.

[0024] By adopting the above technical solution, the horizontal adjustment feet are connected by a fixed bracket, increasing the connection thickness and thus increasing the stability of the horizontal adjustment feet connection and use.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. During depressurization, gas containing particulate matter enters the chamber through the inlet pipe. The filter assembly is activated to filter the gas, and the filtered gas is discharged through the outlet. When air needs to be replenished, outside air enters the chamber through the outlet and is filtered by the filter assembly. The filtered gas then enters the test chamber through the inlet pipe, thereby achieving air pressure balance inside and outside the test chamber. Only one device is needed to complete the depressurization and air replenishment operations of the test chamber, thus improving the convenience of air pressure regulation in sand and dust tests.

[0027] 2. The dual filtration of dust removal filter element and dustproof filter cotton improves the filtration effect of gas.

[0028] 3. After prolonged depressurization, particulate matter can easily accumulate at the connection between the intake pipe and the horizontal pipe. At this time, external air is blown in through the end of the horizontal pipe away from the chamber. The accumulated particulate matter enters the chamber under the action of the airflow, thereby reducing the probability of pipe blockage caused by particulate matter accumulation.

[0029] 4. The device has fewer parts and is simple to install and maintain, thus improving the convenience of air pressure adjustment in sand and dust tests. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of this application;

[0031] Figure 2 This is a schematic diagram of the internal structure of the box in this application, wherein the box is in a depressurized state, and the arrows indicate the direction of gas flow;

[0032] Figure 3 This is a schematic diagram of the cover plate in this application;

[0033] Figure 4 This is a schematic diagram of the structure of the dust removal filter element in this application;

[0034] Figure 5 This is a schematic diagram of the filter cartridge chuck in this application;

[0035] Figure 6 yes Figure 3 A cross-sectional schematic diagram of AA.

[0036] Reference numerals: 1. Chamber; 11. Air inlet; 12. Air outlet; 13. Outer shell; 14. Cover plate; 15. Fixed bracket; 16. Horizontal adjustment feet; 17. Pressure plate; 2. Air inlet pipe; 21. Horizontal pipe; 22. Connecting pipe; 3. Test chamber; 4. Filter assembly; 41. Dust removal filter element; 411. Air vent; 412. Air collection space; 413. Filter space; 42. Dustproof filter cotton; 43. Filter element chuck; 431. Alternating opening; 44. Sealing ring; 5. Compressor; 51. Solenoid valve. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0038] This application discloses a pressure balancing device for a sand and dust test chamber.

[0039] Reference Figure 1 and Figure 2 A pressure balancing device for a sand and dust test chamber includes a chamber 1, which has an air inlet 11 and an air outlet 12. An air inlet pipe 2 is connected to the air inlet 11 and is used to connect to the gas outlet of the test chamber 3. A filter assembly 4 is provided inside the chamber 1 to isolate the air inlet 11 from the air outlet 12.

[0040] Reference Figure 1 and Figure 2The housing 1 includes an outer shell 13 and a cover plate 14 covering the outer shell 13. The top of the outer shell 13 is open. The bottom of the outer shell 13 is provided with a fixed bracket 15. There are two fixed brackets 15, which are respectively fixed on the lower surface of the outer shell 13. The two fixed brackets 15 are parallel to each other and flush with the outer edge of the lower surface of the outer shell 13. The bottom of the housing 1 is provided with a horizontal adjustment foot 16. There are four horizontal adjustment feet 16, which are respectively located at the four corners of the lower surface of the outer shell 13. The horizontal adjustment feet 16 are the commonly used horizontal adjustable feet in the prior art, and the horizontal adjustment feet 16 are threaded to the fixed brackets 15 at the corresponding positions.

[0041] Reference Figure 1 , Figure 2 and Figure 3 The air inlet 11 is located on the outer wall of the outer shell 13, and the air outlet 12 is located on the cover plate 14. The cover plate 14 has a two-layer structure, with the upper layer being a common board and the lower layer being a foamed silicone sealing board. The cover plate 14 is detachably connected to the box 1. In this embodiment, bolt connection is taken as an example. In other feasible embodiments, other detachable connection methods can also be used, such as snap-fit ​​connection.

[0042] Reference Figure 1 and Figure 2 The intake pipe 2 includes a horizontal pipe 21 and a connecting pipe 22. The horizontal pipe 21 is fixed on the air inlet 11. The inner end of the horizontal pipe 21 extends into the housing 1. The end of the horizontal pipe 21 that extends horizontally and is away from the housing 1 is used to introduce outside air. In this embodiment, the other end of the horizontal pipe 21 is connected to a compressor 5, and a solenoid valve 51 is provided between the compressor 5 and the horizontal pipe 21. In other feasible embodiments, multiple intake pipes 2 can be provided, and the other end of the horizontal pipe 21 can also be connected to any other device that can pump air in.

[0043] Reference Figure 1 and Figure 2 The connecting pipe 22 is located on the horizontal pipe 21 and is connected to the horizontal pipe 21. The end of the connecting pipe 22 away from the horizontal pipe 21 is used to connect to the gas port of the test chamber 3. In this embodiment, the end of the connecting pipe 22 connected to the test chamber 3 has a pagoda connector.

[0044] Reference Figure 1 and Figure 2 The filter assembly 4 is located inside the housing 13 and includes a dust removal filter element 41 and a dustproof filter cotton 42.

[0045] Reference Figure 2 , Figure 4 and Figure 5The dust collector filter element 41 is cylindrical and has a vent 411 at the top. A filter element chuck 43 is provided at the top of the dust collector filter element 41. A sealing ring 44 is provided between the dust collector filter element 41 and the filter element chuck 43. The dust collector filter element 41 and the filter element chuck 43 are snapped together. The dust collector filter element 41 is a quick-release filter element in the prior art. The filter element chuck 43 is an installation chuck corresponding to the quick-release filter element. The filter element chuck 43 has a clearance opening 431 that is aligned with the axis of the vent 411. The filter element chuck 43 is connected to the lower surface of the cover plate 14 by bolts. The vent 411 is connected to the air outlet 12 on the cover plate 14, and the axes of the vent 411, the clearance opening 431 and the air outlet 12 are coincident.

[0046] Reference Figure 2 and Figure 4 An air collection space 412 is formed between the outer surface of the dust filter element 41 and the inner wall of the housing 1. The end of the horizontal pipe 21 extending to the air inlet 11 is connected to the air collection space 412. The dust filter element 41 has a filtration space 413 inside, and the filtration space 413 is connected to the air vent 411.

[0047] Reference Figure 2 , Figure 3 and Figure 6 The dustproof filter cotton 42 is located between the air outlet 12 and the air vent 411, and the diameter of the dustproof filter cotton 42 is larger than that of the air outlet 12. The upper surface of the cover plate 14 is provided with an annular pressure plate 17. The inner diameter of the pressure plate 17 is the same as the outer diameter of the air outlet 12, and the axis of the pressure plate 17 coincides with that of the air outlet 12. The pressure plate 17 is pressed on the dustproof filter cotton 42 and is detachably connected to the upper surface of the cover plate 14 by bolts. The dustproof filter cotton 42 is made of PPI dustproof filter cotton. In other feasible embodiments, the dustproof filter cotton 42 can also be replaced by other materials with filtering effect.

[0048] Reference Figure 2 , Figure 3 and Figure 6 During installation, first snap the dust filter element 41 together with the filter element chuck 43, then connect the filter element chuck 43 to the cover plate 14, then connect the cover plate 14 to the outer shell 13, install the dustproof filter cotton 42 at the air outlet 12 through the pressure plate 17, then adjust the level of the chamber 1 through the horizontal adjustable feet, then connect the horizontal pipe 21 to the compressor 5, and connect the connecting pipe 22 to the gas port of the test chamber 3.

[0049] The working principle of this application embodiment is as follows:

[0050] During depressurization, gas containing particulate matter enters the gas collection space 412 through the connecting pipe 22. As the gas continues to flow in, the gas in the gas collection space 412 is filtered by the dust removal filter element 41 and then gathers in the filtration space 413. Subsequently, it moves through the air inlet 411 to the dustproof filter cotton 42 for secondary filtration. The filtered clean gas is discharged through the air outlet 12. The double filtration improves the cleanliness of the discharged gas, thereby improving the protection of the environment and operators.

[0051] When replenishing air, the outside air first passes through the dustproof filter cotton 42 and then enters the filter space 413. After passing through the dust removal filter element 41 again, it is collected in the air collection space 412 and enters the test chamber 3 through the air inlet pipe 2. This reduces the probability of pollutants in the outside air entering the test chamber 3, thereby improving the test effect of the sand and dust test.

[0052] After prolonged depressurization, particulate matter can easily accumulate at the connection between the intake pipe 2 and the horizontal pipe 21. At this time, external air is blown in through the end of the horizontal pipe 21 away from the housing 1, and the accumulated particulate matter enters the housing 1 under the action of the airflow, thereby reducing the probability of pipe blockage caused by particulate matter accumulation.

[0053] This device is relatively simple to install and maintain, has a low probability of clogging, and can complete the depressurization and air replenishment of test chamber 3 with only one device, thereby improving the convenience of air pressure regulation in sand and dust tests.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An air pressure equalizing device for a sand and dust test chamber, characterized by: The utility model relates to a test box, which comprises a box (1) with an air inlet (11) and an air outlet (12), wherein the air inlet (11) is connected with an air inlet pipe (2) for connecting a gas port of a test box (3), and the box (1) is provided with a filter assembly (4) for separating the air inlet (11) from the air outlet (12). The filter assembly (4) comprises: a dust removal filter core (41) arranged in the box (1), wherein the dust removal filter core (41) is in a cylindrical shape and has a ventilation port (411) at the top end, the ventilation port (411) is communicated with the air outlet (12), a gas collection space (412) is formed between the outer surface of the dust removal filter core (41) and the inner wall of the box (1), the air inlet pipe (2) is communicated with the gas collection space (412), and the dust removal filter core (41) has a filter space (413) therein, which is communicated with the ventilation port (411); a dustproof filter cotton (42) arranged between the air outlet (12) and the ventilation port (411).

2. The air pressure equalizing device for a sand and dust test chamber according to claim 1, characterized by: The air inlet pipe (2) comprises a horizontal pipe (21) and a connecting pipe (22), wherein the horizontal pipe (21) is arranged on the air inlet (11) and extends horizontally and is used for introducing external air, and the connecting pipe (22) is arranged on the horizontal pipe (21) and is communicated with the horizontal pipe (21) and is used for being communicated with the gas port of the test box (3).

3. The air pressure equalizing device for a sand and dust test chamber according to claim 1, characterized in that: The box (1) comprises an outer shell (13) and a cover plate (14) arranged on the outer shell (13), the air inlet (11) is arranged on the outer shell (13), the air outlet (12) is arranged on the cover plate (14), the dust removal filter core (41) is provided with a filter core chuck (43) at the top end, and the filter core chuck (43) is located below the dustproof filter cotton (42) and is connected with the lower surface of the cover plate (14).

4. The air pressure equalizing device for a sand and dust test chamber according to claim 3, characterized in that: The cover plate (14) is provided with an annular pressing plate (17) arranged on the dustproof filter cotton (42).

5. The air pressure equalizing device for a sand and dust test chamber according to claim 3, characterized in that: A sealing ring (44) is arranged between the dust removal filter core (41) and the filter core chuck (43).

6. The air pressure equalizing device for a sand and dust test chamber according to claim 1, characterized by: The box (1) is provided with a horizontal adjusting foot stand (16) at the bottom.

7. The air pressure equalizing device for a sand and dust test chamber according to claim 6, characterized in that: The box (1) is provided with a fixing support (15) at the bottom, and the horizontal adjusting foot stand (16) is arranged on the fixing support (15).

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