Part air tightness detection device

Abstract

The utility model discloses a part air tightness detection device which comprises a compressed air source, an outlet pipe of the compressed air source is provided with a pressure regulator and an air valve, the tail end of the outlet pipe is connected with an air probe and a flow sensor, and the flow sensor monitors the flow of air passing through the air probe. The part air tightness detection device further comprises a pressure sensor and a control system, the pressure sensor monitors the air pressure in the box cover to be detected, and the control system controls the compressed air source. According to the box cover part airtightness detection device, a pre-inflation stage is added, the pressure stabilizing effect is improved, detection errors caused by gas resistance during inflation are reduced, a flow sensor is added to detect tracer gas so as to judge the specific position and size of a leakage point, and a more accurate airtightness detection result is obtained; and help is provided for improvement of part technological parameter design.

Description

Technical Field

[0001] The utility model relates to a detection device, more precisely, to a parts air tightness detection device. Background Art

[0002] Airtightness testing technology, a type of leak detection technology, is now widely used in industries such as automotive manufacturing and is a key means of ensuring product quality and production safety. Modern motorcycle parts manufacturers perform airtightness testing on vehicle parts before assembly. This allows them to determine early in the production process whether a part will leak during subsequent use, preventing further processing and assembly of leaking parts and minimizing losses caused by leaks during use.

[0003] Existing air tightness testers often use flow rate and direct pressure methods. The testing process typically consists of four phases: inflation, equilibration, testing, and deflation. The manufacturer's standards specify the starting pressure, test duration, and leakage limit for the workpiece at that starting pressure.

[0004] Existing airtightness detectors have problems such as poor relative stability and inability to determine the specific location of poor airtightness. Therefore, the test results obtained by using current airtightness testing methods are often not accurate enough. Utility Model Content

[0005] Based on this, it is necessary to provide a parts air tightness detection device to address the above technical problems.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A parts air tightness detection device is characterized in that the parts air tightness detection device includes a compressed gas source, the outlet pipe of the compressed gas source is provided with a pressure regulator and an air valve, the end of the outlet pipe is connected to a gas probe and a flow sensor, and the flow sensor monitors the flow of gas passing through the gas probe.

[0008] As a preferred embodiment of the present invention, the parts air tightness detection device further includes a pressure sensor and a control system. The pressure sensor monitors the air pressure in the box cover to be tested, and the control system controls the compressed air source.

[0009] As a preferred embodiment of the present invention, an exhaust valve is provided on the cover of the box to be tested.

[0010] As a preferred embodiment of the present invention, the gas of the compressed gas source is tracer gas.

[0011] As a preferred embodiment of the present invention, the tracer gas is helium.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The utility model provides a parts air tightness detection device. The box cover parts air tightness detection device improves the pressure stabilization effect and reduces the detection error caused by gas resistance during inflation by adding a pre-inflation stage. A flow sensor is added to detect tracer gas to determine the specific position and size of the leakage point, thereby obtaining a more accurate air tightness detection result, and providing assistance for the improvement of the part process parameter design. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the solutions in the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic structural diagram of the box cover parts air tightness detection device of the present utility model;

[0016] Figure 2 This is a schematic diagram of the detection device for detecting air tightness of a box cover part of the present invention;

[0017] In the figure, 1, compressed gas source; 2, pressure regulator; 3, gas valve; 4, pressure sensor; 5, control system; 6, cover of the box to be tested; 7, gas probe; 8, flow sensor; 9, exhaust valve; S, outlet pipe. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] The box cover parts air tightness detection device includes a compressed gas source 1, and the outlet pipe S of the compressed gas source 1 is provided with a pressure regulator 2 and an air valve 3. The end of the outlet pipe S is connected to a gas probe 7 and a flow sensor 8, and the flow sensor 8 monitors the flow of gas passing through the gas probe 7.

[0020] The box cover part air tightness detection device further comprises a pressure sensor 4 and a control system 5 . The pressure sensor 4 monitors the air pressure in the box cover 6 to be tested, and the control system 5 controls the compressed air source 1 .

[0021] The gas of the compressed gas source 1 is a tracer gas, which is helium.

[0022] The working method of the airtightness detection device for the box cover part will be described below. The specific steps are as follows:

[0023] (1) Set parameters through the control system 5. According to the detection requirements, set the upper limit P1 and the lower limit P2 of the test air pressure value.

[0024] (2) Pre-inflate the box cover 6 to be tested. After reaching the lower limit of the set pressure value, continue to inflate slowly for a period of time to keep the pressure value within the preset range.

[0025] (3) Let the box cover 6 to be tested stand still and stabilize the pressure for a period of time. After the pressure stabilization is completed, record the system pressure value as P.

[0026] (4) Enter the test stage. Use the pressure sensor 4 to detect. If P > P2, output that the detection result is qualified and complete the detection.

[0027] (5) If P < P2, move the gas probe 7 connected to the flow sensor 8 on the surface of the workpiece. When the tracer gas is detected, it is determined that there is a leak point at that place. The size of the leak point can be further judged according to the size of the gas flow at the leak point.

[0028] (6) Output the detection result after the detection is completed and enter the deflation stage. Open the exhaust valve 9 to release the gas inside the box cover 6 to be tested.

[0029] By adding a pre-inflation stage, the airtightness detection device for the box cover part improves the pressure stabilization effect and reduces the detection error caused by gas resistance during inflation. By adding a flow sensor to detect the tracer gas to judge the specific position and size of the leak point, a more accurate airtightness detection result is obtained, which provides help for the improvement of the part process parameter design.

[0030] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application.

Claims

1. A parts air tightness detection device, characterized in that, The parts air tightness detection device comprises a compressed air source (1), an outlet pipe (S) of the compressed air source (1) is provided with a pressure regulator (2) and an air valve (3), the end of the outlet pipe (S) is connected to a gas probe (7) and a flow sensor (8), and the flow sensor (8) monitors the flow of gas passing through the gas probe (7).

2. The parts air tightness detection device according to claim 1, characterized in that: The parts air tightness detection device further comprises a pressure sensor (4) and a control system (5), wherein the pressure sensor (4) monitors the air pressure in the box cover (6) to be tested, and the control system (5) controls the compressed air source (1).

3. The parts air tightness detection device according to claim 2, characterized in that: The test box cover (6) is provided with an exhaust valve (9).

4. The parts air tightness detection device according to claim 1, characterized in that: The gas in the compressed gas source (1) is tracer gas.

5. The parts air tightness detection device according to claim 4, characterized in that: The tracer gas is helium.

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