Vehicle body sealing test device

Abstract

The present invention discloses a vehicle body sealing test device, comprising a smoke generator and a blower for conveying the smoke generated by the smoke generator to the inside of a vehicle body to be tested; the blower comprises a blower body and an air supply pipe connected to the exhaust port of the blower body, the other end of the air supply pipe is connected to a smoke box, a smoke mixing mechanism connected to the air supply pipe is arranged in the smoke box, the smoke mixing mechanism is connected to the smoke supply pipe, the other end of the smoke supply pipe passes through the smoke box, and the smoke box is connected to the exhaust port of the smoke generator; the vehicle body sealing test device of the present invention can quickly fill a large amount of smoke into the vehicle body, thereby improving the accuracy of the vehicle body air tightness test.

Description

Technical Field

[0001] The invention belongs to the field of test and detection equipment, and more specifically relates to a vehicle body sealing test device. Background Art

[0002] The body air tightness test is one of the air tightness tests for automobile bodies. It is often used to measure the air tightness of the body and is also an important indicator of the comfort of the whole vehicle. This test not only serves as an important basis for analyzing the water tightness and dust tightness of the whole vehicle, but also plays a certain auxiliary role in improving the sound insulation and noise reduction of the whole vehicle. Therefore, through the test and analysis of the air tightness status of the whole vehicle, it is helpful to grasp the optimization direction of the air tightness of the whole vehicle and formulate relevant measures.

[0003] The air tightness test of the vehicle body is generally to fill the vehicle body with gas with a certain pressure, and then check the sealing parts and welds of the vehicle body for leaks after a certain period of time. In order to facilitate the discovery and observation of the leaking parts, some white smoke is generally added to the filled gas. The smoke enters the vehicle body with the high-pressure gas of the test. If a leak occurs, the smoke overflows from the leaking part, which is intuitive and clear.

[0004] In the prior art, the air tightness test device of the specific smoke generating device is prone to smoke leakage when working, which affects the observation and grasp of the air tightness of the vehicle body. At the same time, the air tightness test device in the prior art often has a small amount of smoke mixed in the high-pressure gas, which leads to less smoke overflowing from the leaking part, making it difficult to observe and find air tightness leakage, affecting the smooth progress of the vehicle body air tightness test. Summary of the invention

[0005] The object of the present invention is to provide a vehicle body airtightness testing device, which can quickly fill a large amount of smoke into the vehicle body and improve the accuracy of the vehicle body airtightness test.

[0006] The technical solution of the present invention is a vehicle body sealing test device, comprising a smoke generator and a blower that transports the smoke generated by the smoke generator to the inside of a vehicle body to be tested; the blower comprises a blower body and an air supply pipe connected to the exhaust port of the blower body, the other end of the air supply pipe is connected to a smoke box, a smoke mixing mechanism connected to the air supply pipe is provided in the smoke box, a smoke mixing mechanism is connected to the smoke supply pipe, the other end of the smoke supply pipe passes through the smoke box, and the smoke box is connected to the exhaust port of the smoke generator.

[0007] Preferably, the smoke generator comprises a smoke generator body and a smoke guide pipe connected to a smoke exhaust port of the smoke generator body, and the other end of the smoke guide pipe is connected to the smoke box.

[0008] Preferably, the smoke mixing mechanism comprises a first tube connected to the air supply pipe and a second tube connected to the first tube away from the air supply pipe end; along the gas delivery direction, a reduced diameter inner tube is arranged in the first tube, and an expanded diameter inner tube is arranged in the second tube, and the diameter of the smaller end of the reduced diameter inner tube is smaller than the diameter of the smaller end of the expanded diameter inner tube;

[0009] A primary annular gap is provided between the two end surfaces where the reduced diameter inner tube and the expanded diameter inner tube are connected. The annular gap is connected with an annular groove, and the annular groove is connected with the interior of the smoke box.

[0010] Preferably, the smoke box is provided with a first air inlet and a second air inlet, and the first air inlet and the second air inlet are respectively provided with a first check valve and a normally open solenoid valve.

[0011] Preferably, a second check valve is provided on the air supply pipe.

[0012] Preferably, the vehicle body sealing test device also includes an equipment box, the smoke generator and the blower are both arranged in the equipment box, the smoke delivery pipe passes through the side of the equipment box and is provided with a sealing connecting flange; a smoke generator refueling port is provided on the top surface of the equipment box, a walking pulley is provided at the bottom of the equipment box, and a handrail is fixed on the rear door of the equipment box.

[0013] The beneficial effect of a vehicle body sealing test device of the technical solution of the present invention is: by setting a smoke box and a smoke mixing mechanism, the smoke generator can be started before the blower blows air into the vehicle body to be tested, so that a large amount of smoke is temporarily stored in the smoke box, and the gas blower works to blow air into the vehicle body. At this time, the smoke in the smoke box will quickly enter the vehicle body under the action of the smoke mixing mechanism, that is, a large amount of smoke can be quickly filled into the vehicle body when the blower starts working, thereby improving the accuracy of the vehicle body air tightness test. At the same time, by setting the smoke mixing mechanism, the airflow rate and airflow pressure entering the vehicle body to be tested are increased, the energy consumption of the blower is reduced, and energy saving and cost reduction are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the external structure of a vehicle body sealing test device according to the technical solution of the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure principle of a vehicle body sealing test device according to the technical solution of the present invention.

[0016] Figure 3 This is an enlarged view of the smoke mixing mechanism according to the technical solution of the present invention. DETAILED DESCRIPTION

[0017] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0018] like Figure 2 As shown, the technical solution of the present invention is a vehicle body sealing test device, comprising an equipment box 6, a smoke generator 1 placed in the equipment box 6, and a blower 2 that transports the smoke generated by the smoke generator 1 to the inside of the vehicle body to be tested. The blower 2 comprises a blower body 21 and an air supply pipe 22 connected to the exhaust port of the blower body 21. The other end of the air supply pipe 22 is connected to a smoke box 3, and a smoke mixing mechanism 4 connected to the air supply pipe 22 is arranged in the smoke box 3. A smoke supply pipe 5 is connected to the smoke mixing mechanism 4, and the other end of the smoke supply pipe 5 passes through the smoke box 3, and the smoke box 3 is connected to the exhaust port of the smoke generator 1.

[0019] Based on the above technical solution, when conducting a vehicle body sealing test, the smoke generator 1 is started first, and the generated smoke is discharged into the smoke box 3 in a concentrated manner. After a large amount of smoke has accumulated in the smoke box 3, the blower 2 is started again. The blower 2 works and delivers the test gas into the vehicle body to be tested through the air supply pipe 22. When the test gas passes through the smoke mixing mechanism in the smoke box 3, the test gas drives the smoke in the smoke box to move into the vehicle body to be tested. Based on the above working process, when the test gas enters the vehicle body to be tested, it carries a large amount of smoke, so that the smoke can quickly fill the vehicle body to be tested, so that the vehicle body to be tested is filled with a large amount of smoke during the entire process of the sealing test, which makes it easy for observers to find the leakage position of the vehicle body to be tested in time.

[0020] In the technical solution, the smoke generator 1 includes a smoke generator body 11 and a smoke guide pipe 12 connected to the smoke outlet of the smoke generator body 11, and the other end of the smoke guide pipe 12 is connected to the smoke box 3. The smoke guide pipe 12 is sealed and connected to the smoke box 3, effectively avoiding the problem of smoke leakage.

[0021] In this technical solution, if Figure 3 As shown, the smoke mixing mechanism 4 includes a first tube 41 connected to the air supply pipe 22 and a second tube 42 connected to the end of the first tube 41 away from the air supply pipe 22. Figure 3 In the direction of the dashed arrow in the middle), a reduced diameter inner tube 411 is arranged in the first tube 41, and an expanded diameter inner tube 421 is arranged in the second tube 42. The diameter of the smaller end of the reduced diameter inner tube 411 is smaller than the diameter of the smaller end of the expanded diameter inner tube 421. There is a primary annular gap 43 between the two end surfaces where the reduced diameter inner tube 411 and the expanded diameter inner tube 421 are connected, and an annular groove 422 is connected on the annular gap 43, and the annular groove 422 is connected to the inside of the smoke box 3.

[0022] Based on the above technical solution, when the blower 2 is started, the air in the air delivery pipe 22 passes through a certain pressure, and after the air enters the enlarged inner tube 421 from the reduced diameter inner tube 411, a negative pressure is formed at the position of the annular gap 43. The negative pressure at the position of the annular gap 43 will suck the smoke and air in the smoke box 3 through the annular groove 422, thus achieving the purpose of quickly sucking the smoke in the smoke box and transporting it to the body of the vehicle. At the same time, a large amount of air is sucked in through the negative pressure, thus increasing the gas flow and gas pressure transported to the body of the vehicle to be tested when the original blower is working, shortening the blower inflation time, accelerating the test efficiency, and also reducing the blower working energy consumption.

[0023] In the technical solution, the smoke box 3 is provided with a first air inlet and a second air inlet, and the first air inlet and the second air inlet are respectively provided with a first check valve 31 and a normally open electromagnetic valve 32 .

[0024] Based on the above technical solution, the normally open solenoid valve 32 is opened when the power is off and closed when the power is on, that is, when the test device is not working, in the power-off state, the normally open solenoid valve 32 is opened to allow external air to enter the smoke box 3. When the test device is working, the normally open solenoid valve 32 is closed to prevent smoke from overflowing the smoke box 3 through the normally open solenoid valve 32.

[0025] Based on the above technical solution, the first check valve 31 is a normally closed valve. When the smoke enters the smoke box, it ensures that the smoke will not overflow from the position of the first check valve 31. At the same time, after the blower works, it first consumes the air in the smoke box and the smoke in the smoke box at the same time. After the air pressure in the smoke box drops, the smoke is also consumed in large quantities. The first check valve 31 starts to open under the pressure difference between the inside and outside of the smoke box. At this time, a large amount of air enters the smoke box and immediately enters the smoke mixing mechanism 4. The remaining smoke in the smoke box or the smoke that has just entered moves toward the smoke mixing mechanism 4 under the action of high-speed airflow, which effectively avoids the problem of smoke overflowing from the position of the first check valve 31. When the air pressure in the vehicle to be tested is about to approach the set value, the smoke generator is first turned off. Finally, after the air pressure in the vehicle to be tested reaches the set value, the blower is turned off and the normally open solenoid valve 32 is closed.

[0026] In this technical solution, a second check valve 23 is provided on the air supply pipe. The second check valve 23 is provided to prevent the gas in the air supply pipe 22 from flowing back. At the beginning of the test, when the smoke generator is working but the blower is not working, the smoke in the smoke box is prevented from flowing back to the blower through the smoke mixing mechanism 4 and the air supply pipe 22 and overflowing from the air inlet of the blower. When the blower is working, the second check valve is automatically opened under the push of the gas.

[0027] In this technical solution, if Figure 1As shown, the smoke delivery pipe 5 passes through the side of the equipment box 3 and is provided with a sealing connection flange 51. The top surface of the equipment box 6 is provided with a smoke generator refueling port 13. The bottom of the equipment box 6 is provided with a walking pulley 63, and a handrail 62 is fixed to the rear door of the equipment box 6. The equipment box 6 is also provided with a control panel 61, which is provided with a display screen and a plurality of control buttons. A controller is provided in the equipment box to control the operation of each smoke generator, blower and normally open solenoid valve.

[0028] The technical solution of the present invention is described above in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A vehicle body sealing test device, characterized in that: It comprises a smoke generator and a blower for conveying the smoke generated by the smoke generator to the inside of the vehicle body to be tested; the blower comprises a blower body and an air supply pipe connected to the exhaust port of the blower body, the other end of the air supply pipe is connected to a smoke box, a smoke mixing mechanism connected to the air supply pipe is arranged in the smoke box, a smoke mixing mechanism is connected to a smoke supply pipe, the other end of the smoke supply pipe passes through the smoke box, and the smoke box is connected to the exhaust port of the smoke generator; The smoke generator comprises a smoke generator body and a smoke guide pipe connected to the smoke exhaust port of the smoke generator body, and the other end of the smoke guide pipe is connected to the smoke box; The smoke mixing mechanism comprises a first tube connected to the air supply pipe and a second tube connected to the first tube away from the air supply pipe end; along the gas delivery direction, a reduced diameter inner tube is arranged in the first tube, and an expanded diameter inner tube is arranged in the second tube, and the diameter of the smaller end of the reduced diameter inner tube is smaller than the diameter of the smaller end of the expanded diameter inner tube; A primary annular gap is provided between the two end surfaces where the reduced diameter inner tube and the expanded diameter inner tube are connected. The annular gap is connected with an annular groove, and the annular groove is connected with the interior of the smoke box.

2. A vehicle body sealing test device according to claim 1, characterized in that: The smoke box is provided with a first air inlet and a second air inlet, and the first air inlet and the second air inlet are respectively provided with a first check valve and a normally open electromagnetic valve.

3. A vehicle body sealing test device according to claim 1, characterized in that: The air supply pipe is provided with a second check valve.

4. A vehicle body sealing test device according to claim 1, characterized in that: It also includes an equipment box, in which the smoke generator and the blower are both arranged, the smoke delivery pipe passes through the side of the equipment box and is provided with a sealing connection flange; a smoke generator refueling port is provided on the top surface of the equipment box, a walking pulley is provided at the bottom of the equipment box, and a handrail is fixed on the rear door of the equipment box.

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