Special-shaped piece low-pressure airtightness detection device

Abstract

The utility model discloses a special-shaped piece low-pressure air tightness detection device, which comprises a fixed base connected with a workbench, a special-shaped piece fixing seat and a three-way fixing block are arranged on the fixed base, and the left end and the right end of the three-way fixing block are respectively connected with the special-shaped piece fixing seat and a vacuum pump through air compressor hoses. And the other end of the three-way fixed block is connected with a precision pressure gauge. The testing device provided by the utility model has the advantage of testing the airtightness of a large batch of special-shaped workpieces, and can be improved according to the actual production requirements of workpieces to test the airtightness of products with different shapes; and meanwhile, immersion in water is not needed, so that the problems of poor storability and the like caused by incapability of predicting aging and loss of the material after the surface of the workpiece is in contact with water are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of airtightness detection, in particular to a low-pressure airtightness detection device for special-shaped parts. Background Art

[0002] After assembling a certain nozzle assembly, its airtightness needs to be detected. To ensure the sealing performance and strength of such workpieces, a sealing test is usually required.

[0003] Generally, for the sealing detection test, most use the water tightness test. By slowly putting the assembly into water and observing whether there are bubbles generated and whether there are water droplets infiltrating into the interior of the assembly to judge its sealing performance, the test cycle is long, the test efficiency of the product is low, and it is difficult to meet the production requirements of a large number of workpieces for sealing tests.

[0004] In addition, for the workpieces after the water tightness test, the aging and loss of the material cannot be predicted after the surface contacts with water, resulting in problems such as poor storage performance. Summary of the Utility Model

[0005] In view of this, the utility model provides a low-pressure airtightness detection device and an airtightness detection method for special-shaped parts.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A low-pressure airtightness detection device for special-shaped parts, a fixed base connected to a workbench, an irregular part fixing seat and a three-way connection fixing block are arranged on the fixed base, the left and right ends of the three-way connection fixing block are respectively connected to the irregular part fixing seat and a vacuum pump through air compressor hoses, and the other end of the three-way connection fixing block is connected to a precision pressure gauge.

[0008] As a further improvement of the above technical solution:

[0009] Preferably, the three-way connection block is connected to the air compressor hose through a double external thread ball valve.

[0010] Preferably, an internal thread pneumatic quick joint is arranged on the double external thread ball valve at one end connected to the vacuum pump.

[0011] Preferably, the connection ends of the precision pressure gauge and both ends of any one of the air compressor hoses are wound with raw material tape.

[0012] Preferably, a silicone rubber layer is coated on the raw material tape.

[0013] Preferably, the fixed base is in a "U" shape, the irregular part fixing seat is arranged on the raised platform of the fixed base, and the three-way connection fixing block is arranged on one side of the raised platform of the fixed base.

[0014] Preferably, the upper opening of the special-shaped component fixing seat is threaded, and a rubber gasket is provided at the bottom inner of the opening of the special-shaped component fixing seat.

[0015] Compared with the existing technology, the beneficial effects of the utility model are:

[0016] 1. The test device of the utility model has the advantage of being able to perform airtightness tests on large quantities of special-shaped workpieces. The test device can be improved according to the actual production needs of workpieces to test the airtightness of products of different shapes. At the same time, there is no need to immerse the workpiece in water, so there is no problem of unpredictable aging and loss of materials after the workpiece surface comes into contact with water, resulting in poor storage performance.

[0017] 2. The main body structure design of the utility model is simple and the materials are easy to obtain, which reduces the complexity of the process of testing the sealing of the workpiece, can greatly shorten the time of product testing, and at the same time reduce the loss of workpiece materials, effectively improving the efficiency of product internal pressure testing.

[0018] 3. The utility model provides a flexible and efficient air tightness testing method. By replacing the external connection device, air can be pumped out and inflated, forming low pressure and high pressure in the device, and realizing high-pressure / low-pressure air tightness testing of special-shaped parts. High / low pressure testing can be selected according to the actual application scenario required by the workpiece. This testing method is simple to operate and improves the overall efficiency of product sealing testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall main view structure of the utility model;

[0020] Figure 2 It is a side view structural diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the top view of the fixed base of the utility model.

[0022] In the figure: 1. Precision pressure gauge; 2. Double external thread ball valve; 3. Three-way fixing block; 4. Fixed base; 5. Air compressor hose; 6. Special-shaped part fixing seat; 7. Internal thread pneumatic quick connector; 8. Rubber gasket. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] As attached Figure 1 As shown, this technical solution consists of the following components: a precision pressure gauge 1, a double external thread ball valve 2, a three-way fixing block 3, a fixed base 4, an air compressor hose 5, a special-shaped part fixing seat 6, an internal thread pneumatic quick connector 7, a rubber gasket 8, and a vacuum pump (not shown in the figure). The double external thread ball valve 2 adopts a 4-point double external thread ball valve 2, the internal thread pneumatic quick connector 7 adopts a 4-point internal thread straight-through PCF-10 pneumatic quick connector, and the vacuum pump adopts a rotary vane vacuum pump.

[0027] like Figure 1 As shown, a precision pressure gauge 1 is installed at one end of the three-way fixed block 3, and the other two ends are connected to the vacuum pump and the special-shaped part fixing seat 6 respectively through the air compressor hose 5 and the double outer thread ball valve 2 (the test workpiece is directly installed on the airtight working mechanism);

[0028] One end of the vacuum pump is connected to an internal thread pneumatic quick connector 7. The interfaces at each end are wrapped with raw tape and then tightened. If necessary, 414 silicone rubber can be applied and cured for 24 hours to ensure the airtightness of the device. The three-way fixed block 3 is welded to the fixed base 4. The welding slag and surface oil stains need to be processed. At the same time, the fixed base 4 is in the shape of a "J". The special-shaped part fixing seat 6 is installed at the raised end, and the three-way fixed block 3 is installed at the horizontal side of the raised end.

[0029] like Figure 1 As shown, the entire fixed base 4 is made of 45 steel, the surface is blued to allow plate welding, sharp edges are blunted, and the surface is deslagging and degreasing.

[0030] The two ends of the fixed base 4 are fixed on the corresponding workbench in the workshop with 4 M16×65 bolts.

[0031] As attached Figure 3 As shown, the special-shaped part fixing seat 6 is connected to the detection workpiece using threads. In order to ensure that there is no air leakage at the connection, multiple rubber washers 8 are added to the lower end of the thread to ensure the airtightness of the connection.

[0032] In addition, the structure and shape of the special-shaped part fixing seat 6 can be changed according to the different special-shaped parts to complete the airtightness detection of different types of workpieces.

[0033] like Figure 2 As shown, the three-way fixing block 3 is connected to the vacuum pump at one end through the air compressor hose 5, and is connected to the air-shaped part fixing seat 6 at the other end through the air compressor hose 5. Both ends are connected to the double-outer-thread ball valve 2 for controlling the air pressure in the device, and one end is connected to the precision pressure gauge 1. The air tightness of the workpiece can be judged by observing the numerical changes of the precision pressure gauge 1.

[0034] When processing the triple-connection fixing block 3, it is necessary to perform a surface bluing treatment, a sharp edge blunting treatment, and a surface degreasing treatment.

[0035] The use process of this utility model:

[0036] The use of this special-shaped parts sealing test device is divided into two major steps: one is to test the sealing of the device itself before testing; the other is to test the sealing of the test workpiece.

[0037] When testing the device for leaks before testing:

[0038] 1) First check whether the air compressor hose 5 is damaged or leaking to ensure that there will be no leakage during the test;

[0039] 2) Check whether the 4-point double-external-thread ball valve 2 and the three-way fixing block 3, the 4-point internal-thread straight-through PCF-10 pneumatic quick connector and the 4-point double-external-thread ball valve 2, and the three-way fixing block 3 and the precision pressure gauge 1 are tightened to ensure the air tightness of the device;

[0040] 3) Check whether the precision instrument meter can work normally, determine whether the range selection is suitable for the workpiece to be measured, and adjust the precision instrument meter to zero.

[0041] When the workpiece is tested for sealing,

[0042] 1) Pass the workpiece to be tested through the airtightness detection device through the threaded connection nozzle, and rotate it until there is no gap between the workpiece and the device;

[0043] 2) Open the 4-point double outer thread ball valve 2 at both ends of the three-way fixed block 3 to facilitate the gas extraction outside the device and form an air pressure difference;

[0044] 3) Start the rotary vane vacuum pump. When the value displayed on the precision pressure gauge 1 reaches the required range, close the valve connected to one end of the rotary vane vacuum pump to stop extracting gas from the device.

[0045] 4) Observe the changes in the value of the precision pressure gauge 1. If there is no change within 3 seconds, it means that the air tightness of the workpiece meets the requirements, and the air tightness test of one workpiece is completed.

[0046] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A low-pressure airtightness detection device for special-shaped parts, characterized in that: A fixed base (4) connected to the workbench, an irregular part fixing seat (6) and a three-way connecting block (3) are arranged on the fixed base (4), the left and right ends of the three-way connecting block (3) are respectively connected to the irregular part fixing seat (6) and the vacuum pump through an air compressor hose (5), and the other end of the three-way connecting block (3) is connected to a precision pressure gauge (1).

2. The low-pressure airtightness detection device for special-shaped parts according to claim 1, characterized in that: The three-way connecting block is connected to the air compressor hose (5) through a double external thread ball valve (2).

3. The low-pressure airtightness detection device for special-shaped parts according to claim 2, characterized in that: An internal thread pneumatic quick connector (7) is arranged on one end double external thread ball valve (2) connected to the vacuum pump.

4. The low-pressure airtightness detection device for special-shaped parts according to claim 1, characterized in that: Sealing tapes are wound around both ends of the connection end of the precision pressure gauge (1) and any one of the air compressor hoses (5).

5. The low-pressure airtightness detection device for special-shaped parts according to claim 4, characterized in that: A silicone rubber layer is coated on the sealing tape.

6. The low-pressure airtightness detection device for special-shaped parts according to claim 1, characterized in that: The fixed base (4) is in a "U" shape, the irregular part fixing seat (6) is arranged on the raised platform of the fixed base (4), and the three-way connecting block (3) is arranged on one side of the raised platform of the fixed base (4).

7. The low-pressure airtightness detection device for special-shaped parts according to claim 1, characterized in that: The upper end opening of the irregular part fixing seat (6) is in a threaded shape, and a rubber washer (8) is arranged at the inner bottom of the opening of the irregular part fixing seat (6).

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