Positive and negative pressure environment test box

Abstract

The utility model discloses a positive and negative pressure environment test chamber, which comprises a chamber body, a negative pressure pump, a gas compressor and a high-pressure gas storage tank, the negative pressure pump is connected with the chamber body through a gas pipe I, the chamber body is connected with the high-pressure gas storage tank through a gas pipe II, the gas compressor is connected with the high-pressure gas storage tank through a gas pipe III, and the gas compressor is connected with the high-pressure gas storage tank through a gas pipe III. Sliding grooves are formed in the tops of two side plates of the box body, a slidable top plate is installed on the sliding grooves, a camera is fixed to the lower portion of the top plate through screws, the camera is wrapped with a transparent pressure-resistant cover, a workpiece supporting seat is arranged in the middle of the interior of the box body, and a workpiece is arranged on the workpiece supporting seat. The two ends of the box body are each provided with a pressure buffering mechanism. According to the utility model, by installing the camera, the specific change of the tested piece in the box body when the tested piece is subjected to pressure change can be seen in real time; through the arrangement of the pressure buffering mechanism, the pressure borne by the tested piece changes slowly, and the pressure buffering mechanism is simple in structure.

Description

Technical Field

[0001] The utility model relates to a test box, in particular to a positive and negative pressure environment test box. Background Art

[0002] The positive pressure test (also known as overpressure test, high pressure test, negative altitude test) corresponds to the low pressure test, which is to put the test sample into the test box, then raise the air pressure in the box to the value specified by the relevant standards, and maintain the test for a specified duration. Its main purpose is to determine the adaptability of components, equipment or other products to high pressure environments during storage, transportation and use. For example, the patent 2021115993464 published by our company is a multi-purpose positive and negative pressure environment test box and its use method, in which the test box device includes a negative pressure device, a positive pressure device, a pressure control device, a test box and an air source use device, the negative pressure device includes a negative pressure pump and an air pipe nozzle, the negative pressure pump is connected to the test box through an air pipe I, and a pressure sensor I and a pressure sensor II are provided in the test box, and the air pipe nozzle is connected to the test box through an air pipe II; the positive pressure device includes a gas compressor and a high-pressure gas storage tank, and the air source use device is connected to the test box; the use method includes the steps of: realizing a negative pressure environment inside the test box, realizing a positive pressure environment inside the test box, and realizing an alternating pressure environment inside the test box. It is possible to evaluate the performance status of the test piece under various air pressure conditions.

[0003] However, the above-mentioned environmental test chamber can only sense the change of pressure inside the chamber, while the change of the test piece inside cannot be checked. At the same time, the pressure control device on the existing test chamber is too complicated and costly. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a positive and negative pressure environmental test chamber.

[0005] According to the technical solution provided in the embodiment of the present application, the positive and negative pressure environmental test box includes a box body, a negative pressure pump, a gas compressor and a high-pressure gas storage tank, the negative pressure pump is connected to the box body through air pipe one, the box body and the high-pressure gas storage tank are connected through air pipe two, the gas compressor is connected to the high-pressure gas storage tank through air pipe three, and a slide groove is provided on the top of the two side panels of the box body, a slidable top plate is installed on the slide groove, a camera is fixed under the top plate by screws, a transparent pressure-resistant cover is wrapped around the camera, a workpiece support seat is provided in the middle of the interior of the box body, and a pressure buffer mechanism is provided at both ends of the box body.

[0006] In the utility model, a rubber pad is fixed under the slide groove by industrial glue.

[0007] In the utility model, the first air pipe is provided with a pressure regulating valve and a first solenoid valve, the second air pipe is provided with a pressure regulating valve, a second solenoid valve and a one-way valve; the third air pipe is provided with a third solenoid valve.

[0008] In the utility model, a pressure sensor 1 and a pressure sensor 2 are arranged in the box.

[0009] In the utility model, the camera includes a 4G signal module, a wireless charging module and a battery.

[0010] In the utility model, the workpiece support seat comprises a circular bottom plate and a support rod. The circular bottom plate is provided with a plurality of oblique threaded holes and a plurality of vertical threaded holes, and the support rod is installed in the threaded holes.

[0011] In the utility model, the pressure buffer mechanism comprises a baffle and an airbag layer. The airbag layer is attached to and fixed on the baffle. The airbag layer is formed by a plurality of separate airbags connected to each other.

[0012] In summary, the beneficial effects of this application are:

[0013] 1. By installing a camera, you can see in real time the specific changes of the test piece when it is subjected to pressure changes in the box;

[0014] Second, by setting up the pressure buffer mechanism, the pressure on the test piece changes gradually, and the structure of the pressure buffer mechanism is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the box body in the utility model;

[0018] Figure 3 It is a structural schematic diagram of the workpiece support seat in the utility model;

[0019] Figure 4 It is a structural schematic diagram of the pressure buffer mechanism in the utility model under negative pressure state.

[0020] Numbers in the figure:

[0021] Box body-1; negative pressure pump-2; gas compressor-3; high pressure gas storage tank-4; top plate-5; workpiece support seat-6; pressure buffer mechanism-7; rubber pad-8; pressure regulating valve-9; solenoid valve-1-10; pressure regulating valve-2-14; solenoid valve-2-15; one-way valve-1-16; solenoid valve-3-17; pressure sensor-1-18; pressure sensor-2-19;

[0022] Camera-51; pressure-resistant cover-52; circular bottom plate-61; support rod-62; baffle-71; airbag layer-72. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] like Figure 1-Figure 4 As shown, the positive and negative pressure environment test box, the box body 1 is a sheet metal frame structure. Except for the top, the other parts adopt an integrated structure to ensure sealing. A slide groove is provided on the upper inner side of each of the two side panels, and a rubber pad 8 is fixed by industrial glue at a place parallel to the bottom edge of the slide groove. The height of the other two sides without the slide groove is lower than the side panels with the slide groove. In order to increase the airtightness, the rubber pad 8 is also glued on the two side panels without the slide groove. The top plate 5 is also made of sheet metal, and its thickness is tangent to the groove of the slide groove.

[0026] A camera 51 is installed on the top plate 5 by means of screws or industrial glue. The camera 51 contains a 4G signal module, a wireless charging module and a battery. The battery supplies power to the camera, the 4G signal module, etc., and the wireless charging module can be charged wirelessly. A through hole adapted to the camera 51 is provided at the position of the top plate 5 directly above the camera 51.

[0027] A workpiece support seat 6 is fixed on the bottom plate of the box body 1 by screws or the like, and is mainly used to place the workpiece to be tested, so that the bottom of the workpiece is separated from the bottom of the box body 1, and is also subjected to pressure testing. At the same time, due to the different sizes of different workpieces, a plurality of oblique threaded holes and a plurality of vertical threaded holes are provided on the circular bottom plate 61 of the workpiece support seat for the installation of the support rod 62. The oblique threaded holes toward the center of the circle can make the support rod 62 tilt toward the center of the circular bottom plate 61.

[0028] Pressure buffer mechanisms 7 are installed on both sides of the box body 1 by screws, and mainly include a baffle 71 and an airbag layer 72, and one side of the airbag layer 72 is attached to the baffle 71. The airbag layer 72 is mainly composed of a number of small airbags that are not interconnected. Under normal conditions, there is only a 0.1mm gap between each adjacent small airbag. When the environmental pressure increases, the small airbags are squeezed and become smaller, and the gap increases, so that the airflow slowly flows to the workpiece. Similarly, when the environmental pressure decreases, the small airbags increase, so that the environmental decompression of the workpiece is slowly carried out. It can effectively reduce the unnatural changes of the workpiece when the pressure changes suddenly.

[0029] The pressure sensor 1 18 and the pressure sensor 2 19 are mainly used to detect the pressure change in the box 1 and display it on their own display screens.

[0030] A pressure regulating valve 9 and a solenoid valve 10 are provided on the air pipe 1, a pressure regulating valve 14, a solenoid valve 15 and a one-way valve 16 are provided on the air pipe 2, and a solenoid valve 3 17 is provided on the air pipe 3. These valves are mainly used to control the operation of the negative pressure pump 2, the gas compressor 3 and the high-pressure gas storage tank 4 and the gas flow direction.

[0031] The method of using this device is as follows:

[0032] When a negative pressure environment is needed, the negative pressure pump 2 is first operated, and then the solenoid valve and the pressure regulating valve on the passage are manually opened and adjusted, and the gas in the box 1 is slowly discharged to the negative pressure passage through the pressure buffer mechanism 7. The lower the pressure in the box 1, the slower the gas is discharged due to the effect of the pressure buffer mechanism 7. At this time, the pressure sensor 1 18 and the pressure sensor 2 19 will display the pressure in the box 1, and the camera 51 will also capture the specific changes of the test piece. Thus, the specific changes of the test piece under different negative pressure environments can be known.

[0033] When a positive pressure environment is needed, the gas compressor 3 and the high-pressure gas storage tank 4 start working, and the solenoid valve and the pressure regulating valve on the positive pressure path are manually opened to provide a positive pressure environment to the box body 1. The gas flows into the box body 1 through the pressure buffer mechanism 7. The speed of the gas flowing into the box body 1 will gradually increase because the gap between adjacent small air bags becomes larger due to the positive pressure.

[0034] This device is suitable for testing some workpieces that do not require high precision.

[0035] The above description is only an explanation of the preferred embodiments of the present application and the technical principles and other schemes used. At the same time, the scope of the utility model involved in the present application is not limited to the technical scheme formed by a specific combination of the above technical features, but also includes other technical schemes formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical scheme.

Claims

1. A positive and negative pressure environment test box, comprising a box body (1), a negative pressure pump (2), a gas compressor (3) and a high-pressure gas storage tank (4), wherein the negative pressure pump (2) is connected to the box body (1) via a first air pipe, the box body (1) and the high-pressure gas storage tank (4) are connected via a second air pipe, and the gas compressor (3) is connected to the high-pressure gas storage tank (4) via a third air pipe, wherein: The tops of the two side plates of the box body (1) are provided with slide grooves, a slidable top plate (5) is installed on the slide grooves, a camera (51) is fixed below the top plate (5) by screws, a transparent pressure-resistant cover (52) is wrapped around the camera (51), a workpiece support seat (6) is provided in the middle of the interior of the box body (1), and a pressure buffer mechanism (7) is provided at each end of the box body (1).

2. The positive and negative pressure environmental test chamber according to claim 1 is characterized in that: A rubber pad (8) is fixed below the slide groove by industrial glue.

3. The positive and negative pressure environmental test chamber according to claim 1, characterized in that: The first air pipe is provided with a pressure regulating valve (9) and a solenoid valve (10), the second air pipe is provided with a pressure regulating valve (14), a second solenoid valve (15) and a one-way valve (16), and the third air pipe is provided with a solenoid valve (17).

4. The positive and negative pressure environmental test chamber according to claim 1, characterized in that: The box body (1) is provided with a first pressure sensor (18) and a second pressure sensor (19).

5. The positive and negative pressure environmental test chamber according to claim 1, characterized in that: The camera (51) includes a 4G signal module, a wireless charging module and a battery.

6. The positive and negative pressure environment test chamber according to claim 1, characterized in that: The workpiece support seat (6) comprises a circular bottom plate (61) and a support rod (62). The circular bottom plate (61) is provided with a plurality of oblique threaded holes and a plurality of vertical threaded holes, and the support rod (62) is installed in the threaded holes.

7. The positive and negative pressure environment test chamber according to claim 1 is characterized in that: The pressure buffer mechanism (7) comprises a baffle (71) and an airbag layer (72). The airbag layer (72) is attached to and fixed on the baffle (71). The airbag layer (72) is formed by a plurality of separate airbags connected to each other.

Images