Automobile part air tightness detection device

Abstract

The utility model discloses an air tightness detection device for automobile parts, which comprises a workbench and a detection assembly arranged on the workbench and used for detecting the air tightness of an automobile fuel tank, and the detection assembly comprises a multi-way manual rotary valve fixedly connected to the workbench. An air outlet hole of the multi-way manual rotary valve is connected with a first air pipe, the other end of the first air pipe is connected with a detection blocking pipe through a threaded connector, the detection blocking pipe is provided with a sealing assembly used for being connected and sealed with an oil filling port of an automobile fuel tank, and the first air pipe is provided with a pressure gauge. According to the utility model, through the arrangement of the detection assembly, under the sealing effect of the sealing assembly and the cooperation effect of the inflation assembly and the extrusion assembly, the connection convenience of the detection plugging pipe and the use long-term effect of the rubber air bag are improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts airtightness testing technology, specifically an automotive parts airtightness testing device. Background Technology

[0002] When using the pressure decay method to test the airtightness of automotive components, such as a fuel tank, the test plug is first inserted into the fuel filler neck, and gas is introduced at a certain pressure. Then, the air intake is closed, and the pressure decay is observed over a period of time. If the pressure drop exceeds a specified range, it indicates a leak. For example, the fuel tank is first pressurized to 30 kPa, the air intake valve is closed, and after 10 minutes of observation, if the pressure drop exceeds 1 kPa, it is considered a leak.

[0003] In actual testing, to ensure a tight seal between the testing plug and the fuel filler neck of the vehicle, existing technology involves installing a sealing ring on the side wall of the testing plug to improve the seal. While the rubber ring enhances the seal, it also creates resistance when inserting the testing plug into the fuel filler neck. This reduces the ease of connection and, during repeated connection attempts, the rubber ring is subjected to constant compression, which can lead to surface cracking and reduced durability.

[0004] Therefore, there is an urgent need for an airtightness testing device for automotive parts to solve the above problems. Utility Model Content

[0005] To achieve the above objectives, the present invention provides the following technical solution: an airtightness testing device for automotive parts, including a workbench and a testing component disposed on the workbench for airtightness testing of an automotive fuel tank;

[0006] The detection assembly includes a multi-port manual rotary valve fixedly connected to the workbench. The air outlet of the multi-port manual rotary valve is connected to a first air pipe. The other end of the first air pipe is connected to a detection plug pipe through a threaded joint. The detection plug pipe is equipped with a sealing assembly for connecting and sealing with the fuel filler neck of the vehicle's fuel tank. The first air pipe is equipped with a pressure gauge.

[0007] The workbench is equipped with a pneumatic dual unit. The air outlet of the pneumatic dual unit is connected to the air inlet of a multi-way manual rotary valve through a second air pipe, and the air inlet of the pneumatic dual unit is connected to an external air pump through a third air pipe.

[0008] The sealing assembly includes multiple annular sealing grooves formed on the side wall of the detection plug, each annular sealing groove being provided with a rubber air bladder, the detection plug having multiple through holes communicating with the rubber air bladder, and the detection plug being provided with an inflation assembly for preferentially inflating the rubber air bladder with gas.

[0009] The inflation assembly includes a conical sleeve fixedly connected inside the detection plug tube. The conical end of the conical sleeve is located near the threaded joint. A sealing ball is slidably connected to the conical sleeve. The detection plug tube is provided with a compression assembly for squeezing the sealing ball and an adjustment assembly for adjusting the compression force of the compression assembly.

[0010] The extrusion assembly includes a mesh plate slidably connected to the detection blockage tube. A spring is provided on the side of the mesh plate near the sealing ball, and the other end of the spring is connected to the sealing ball.

[0011] The adjustment assembly includes two fixed plates fixedly connected to the end of the detection plug away from the threaded joint. The two fixed plates are provided with adjustment tubes on the side near the mesh plate. One end of the two adjustment tubes is connected to the mesh plate. One of the two adjustment tubes is slidably connected to an adjustment rod. One end of the adjustment rod is connected to the fixed plate. The other of the two adjustment tubes is threadedly connected to a threaded rod. One end of the threaded rod passes through the fixed plate and is fixedly connected to an adjustment ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention, through the design of the detection component, utilizes the sealing effect of the sealing component and the combined action of the inflation and compression components to ensure the sealing performance between the detection plug and the inner wall of the vehicle's fuel filler neck. Simultaneously, it minimizes the resistance to inserting and removing the detection plug, thereby improving the ease of connection. Furthermore, during multiple connection processes, the rubber airbag experiences less compressive force, reducing the risk of surface cracking due to compression deformation and further enhancing the longevity of the rubber airbag. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the detection component structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the internal structure of the sealing component of this utility model.

[0017] In the diagram: 1. Workbench; 201. Multi-port manual rotary valve; 202. First air pipe; 203. Threaded connector; 204. Detection plug; 205. Pressure gauge; 206. Pneumatic dual unit; 207. Second air pipe; 208. Third air pipe; 301. Annular sealing groove; 302. Rubber air bladder; 303. Through hole; 401. Conical sleeve; 402. Sealing ball; 501. Mesh plate; 502. Spring; 601. Fixing plate; 602. Adjusting pipe; 603. Adjusting rod; 604. Threaded rod; 605. Adjusting ring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0019] Please see Figures 1-3 The figure shows an airtightness testing device for automotive parts, including a workbench 1 and a testing component disposed on the workbench 1 for airtightness testing of automotive fuel tanks.

[0020] The detection assembly includes a multi-way manual rotary valve 201 fixedly connected to the workbench 1. The air outlet of the multi-way manual rotary valve 201 is connected to a first air pipe 202. The other end of the first air pipe 202 is connected to a detection plug 204 through a threaded connector 203. The detection plug 204 is provided with a sealing component for connecting and sealing with the fuel filler neck of the automobile fuel tank. The first air pipe 202 is provided with a pressure gauge 205.

[0021] It should be noted that, through the design of the detection component and the sealing effect of the sealing component, the connection between the detection plug 204 and the inner wall of the fuel filler neck of the vehicle is sealed, while the resistance to insertion and removal of the detection plug 204 is reduced, thereby improving the ease of connection of the detection plug 204. At the same time, the compressive force on the rubber airbag 302 is small during multiple connection processes, thus reducing the risk of surface cracking of the rubber airbag 302 due to compression deformation, thereby further improving the service life of the rubber airbag 302.

[0022] It is worth noting that the multi-way manual rotary valve 201 is a valve that controls the flow direction of fluid liquids or gases through manual operation. Its working principle is to use the rotation of the valve core to change the connection mode of the fluid channel, thereby realizing the functions of fluid conduction, cut-off, or reversal. As it is existing technology, it will not be elaborated on here.

[0023] Please see Figure 1 The workbench 1 in the figure is equipped with a pneumatic dual unit 206. The air outlet of the pneumatic dual unit 206 is connected to the air inlet of the multi-way manual rotary valve 201 through the second air pipe 207. The air inlet of the pneumatic dual unit 206 is connected to an external air pump through the third air pipe 208.

[0024] It should be noted here that the pneumatic dual unit 206 is used for filtering and regulating the pressure of the gas.

[0025] It is worth noting that the pneumatic dual unit 206 is an air source treatment device composed of an air filter and a pressure reducing valve. The main working principle is that compressed air first enters the air filter, and after filtration, impurities and moisture are removed to obtain relatively clean air. Then, the clean air enters the pressure reducing valve. The pressure reducing valve controls the output air pressure by adjusting the valve opening according to the set pressure value, so that the output air pressure is stabilized within the required working pressure range, and finally provides a stable and clean air source for pneumatic equipment or systems.

[0026] Please see Figure 2 and Figure 3 The sealing assembly shown in the figure includes multiple annular sealing grooves 301 formed on the side wall of the detection plug 204, each annular sealing groove 301 is provided with a rubber airbag 302, the detection plug 204 is provided with multiple through holes 303 communicating with the rubber airbag 302, and the detection plug 204 is provided with an inflation assembly for allowing gas to preferentially inflate the rubber airbag 302.

[0027] It should be noted here that the sealing component is used to form a connection seal between the detection plug 204 and the inner wall of the fuel filler neck of the vehicle.

[0028] Please see Figure 3 The inflation assembly shown in the figure includes a conical sleeve 401 fixedly connected inside the detection plug tube 204. The conical small end of the conical sleeve 401 is located near the threaded joint 203. The conical sleeve 401 is slidably connected to a sealing ball 402. The detection plug tube 204 is provided with a compression assembly for compressing the sealing ball 402 and an adjustment assembly for adjusting the compression force of the compression assembly.

[0029] It should be noted that the inflation component is designed to allow gas to preferentially enter the rubber airbag 302 through the through hole 303.

[0030] Please see Figure 3 The extrusion assembly shown in the figure includes a mesh plate 501 slidably connected to the detection plug 204. A spring 502 is provided on the side of the mesh plate 501 near the plugging ball 402, and the other end of the spring 502 is connected to the plugging ball 402.

[0031] It should be noted here that the compression component is used to push the sealing ball 402 against the inner wall of the conical sleeve 401, so that gas can preferentially enter the rubber airbag 302 from the through hole 303.

[0032] Working principle: When it is necessary to test the air tightness of the car fuel tank, first place the car fuel tank on the workbench 1, then select the test plug 204 according to the diameter of the fuel filler neck of the car fuel tank, and connect it to the first air pipe 202 through the threaded connector 203. After the test plug 204 is installed, it can be inserted into the fuel filler neck of the car fuel tank.

[0033] After inserting the detection plug tube 204 into the fuel filler neck of the car, the external air pump can be started, and the gas is delivered to the pneumatic dual unit 206 through the third air tube 208. After being filtered and pressure regulated by the pneumatic dual unit 206, the gas is delivered to the multi-way manual rotary valve 201 through the second air tube 207. Then, by rotating the handle of the multi-way manual rotary valve 201, the air inlet of the internal valve body is connected to the first air tube 202 through a set of channels of the valve core, so that the gas can be delivered from the first air tube 202 to the detection plug tube 204.

[0034] After the gas is delivered into the detection plug 204, under the action of the inflation component and the compression component, the gas is preferentially delivered from the through hole 303 into the rubber airbag 302, thereby causing the rubber airbag 302 to expand. The expanded rubber airbag 302 will abut against the inner wall of the fuel filler neck of the car fuel tank, thereby forming a connection seal between the detection plug 204 and the inner wall of the fuel filler neck of the car fuel tank. As the gas is continuously delivered, when the rubber airbag 302 and the inner wall of the fuel filler neck of the car fuel tank are pressed together to a certain pressure, the gas pressure in the detection plug 204 will exceed the compression force of the compression component on the sealing ball 402. At this time, the gas will push the sealing ball 402 away from the conical sleeve 401, thereby causing the gas to flow into the car fuel tank from the gap between the sealing ball 402 and the conical sleeve 401. During the process of the gas flowing into the car fuel tank, under the reverse thrust of the compression component on the sealing ball 402, the gas will still maintain the inflation of the rubber airbag 302.

[0035] As gas is continuously delivered to the vehicle's fuel tank, when the gas pressure displayed by the pressure gauge 205 reaches the detection standard, the flow of gas to the first gas pipe 202 can be blocked by rotating the handle of the multi-way manual rotary valve 201. Then, by observing the pressure gauge 205 for a period of time, if the pressure drop exceeds the specified range, it indicates that there is a leak in the vehicle's fuel tank. If the pointer change range of the pressure gauge 205 is within the required range, it indicates that the vehicle's fuel tank is airtight.

[0036] After the fuel tank airtightness test is completed, the multi-way manual rotary valve 201 handle can be rotated again to rotate the valve core to another position. When the valve core is rotated to another position, the first air pipe 202 is connected to the exhaust port through another set of channels of the valve core, thereby releasing air from the fuel tank. During the air release process, due to the decrease in air pressure inside the detection plug 204, the rubber airbag 302 will contract into the annular sealing groove 301. After the air pressure is released for a period of time, the detection plug 204 can be pulled out from the fuel filler neck of the fuel tank. During the insertion and removal of the detection plug 204 from the fuel filler neck of the fuel tank, since the rubber airbag 302 is not inflated by air, the resistance to insertion and removal of the detection plug 204 is small, thereby improving the convenience of connecting the detection plug 204. At the same time, the rubber airbag 302 is subjected to less compressive force during multiple connection processes, thus reducing the risk of surface cracking caused by compression deformation of the rubber airbag 302, thereby further improving the service life of the rubber airbag 302. Example

[0037] Please see Figure 3 This embodiment further illustrates Example 1. The adjustment assembly shown in the figure includes two fixed plates 601 fixedly connected to the end of the detection plug 204 away from the threaded joint 203. An adjustment tube 602 is provided on the side of the two fixed plates 601 near the mesh plate 501. One end of the two adjustment tubes 602 is connected to the mesh plate 501. One of the two adjustment tubes 602 is slidably connected to an adjustment rod 603. One end of the adjustment rod 603 is connected to the fixed plate 601. The other adjustment tube 602 is threadedly connected to a threaded rod 604. One end of the threaded rod 604 passes through the fixed plate 601 and is fixedly connected to an adjustment ring 605.

[0038] It should be noted that, through the adjustment of the components, the rotation of the adjusting ring 605 will drive the threaded rod 604 to rotate. Under the threaded engagement of the threaded rod 604 and the adjusting tube 602, and the guiding action of the adjusting rod 603, the mesh plate 501 will move closer to and further away from the conical sleeve 401, thereby changing the compression of the spring 502 by the mesh plate 501. By adjusting the compression of the spring 502, the squeezing force on the sealing ball 402 is changed. This facilitates the adjustment of the sealing squeezing force of the sealing ball 402 on the conical sleeve 401 according to the gas pressure during the detection process. At the same time, it also facilitates the adjustment of the sealing ball 402 on the conical sleeve 401 after multiple uses due to the deformation of the spring 502, which reduces the squeezing force. This improves the long-term sealing effect of the sealing ball 402 on the conical sleeve 401.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automobile part air tightness detection device, comprising: a workbench (1); characterized in that it further comprises: a detection assembly arranged on the workbench (1) for detecting the air tightness of an automobile fuel tank; the detection assembly comprises a multi-way manual rotary valve (201) fixedly connected to the workbench (1), a first air pipe (202) connected to a gas outlet of the multi-way manual rotary valve (201), a detection plug pipe (204) connected to the other end of the first air pipe (202) through a threaded joint (203), a sealing assembly arranged on the detection plug pipe (204) for connecting and sealing with a fuel filler of the automobile fuel tank, and a pressure gauge (205) arranged on the first air pipe (202).

2. The automobile part air tightness detection device according to claim 1, characterized in that: the workbench (1) is provided with a pneumatic two-way joint (206), a gas outlet of the pneumatic two-way joint (206) is connected to a gas inlet of the multi-way manual rotary valve (201) through a second air pipe (207), and a gas inlet of the pneumatic two-way joint (206) is connected to an external air pump through a third air pipe (208).

3. The automobile parts air tightness detection device according to claim 1, characterized in that: the sealing assembly comprises a plurality of annular sealing grooves (301) arranged on the side wall of the detection plug pipe (204), each annular sealing groove (301) is provided with a rubber air bag (302), the detection plug pipe (204) is provided with a plurality of through holes (303) in communication with the rubber air bags (302), and the detection plug pipe (204) is provided with an inflation assembly for preferentially inflating the rubber air bags (302) with gas.

4. The automobile part air tightness detection device according to claim 3, characterized in that: the inflation assembly comprises a conical sleeve (401) fixedly connected to the detection plug pipe (204), a small end of the conical sleeve (401) is arranged close to the threaded joint (203), the conical sleeve (401) is slidably connected with a blocking ball (402), the detection plug pipe (204) is provided with an extrusion assembly for extruding the blocking ball (402) and an adjusting assembly for adjusting the extrusion force of the extrusion assembly.

5. The automobile parts air tightness detection device according to claim 4, characterized in that: the extrusion assembly comprises a mesh plate (501) slidably connected to the detection plug pipe (204), one side of the mesh plate (501) close to the blocking ball (402) is provided with a spring (502), and the other end of the spring (502) is connected with the blocking ball (402).

6. The automobile parts air tightness detection device according to claim 5, characterized in that: the adjusting assembly comprises two fixed plates (601) fixedly connected to the detection plug pipe (204) away from the threaded joint (203), one side of the two fixed plates (601) close to the mesh plate (501) is provided with an adjusting pipe (602), one end of the two adjusting pipes (602) is connected with the mesh plate (501), one of the two adjusting pipes (602) is slidably connected with an adjusting rod (603), one end of the adjusting rod (603) is connected with the fixed plate (601), the other of the two adjusting pipes (602) is threadedly connected with a threaded rod (604), one end of the threaded rod (604) penetrates through the fixed plate (601) and is fixedly connected with an adjusting ring (605).

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