An automobile part air tightness detection device

Abstract

The utility model relates to detection device technical field, concretely relates to a kind of automobile parts air tightness detection device, including detection workbench and the air tightness detection mechanism being set on detection workbench, the upper end of the detection workbench is fixedly installed with support plate at both sides, the upper end of the detection workbench is placed with automobile fuel pipe, the inside fixed sleeve of the support plate is connected with connecting barrel, one end of the connecting barrel is provided with air inlet valve, sealing fixed component is provided between the connecting barrel and automobile fuel pipe, the radial sealing fixation of fuel pipe is realized by sealing fixed component, compared with traditional mode relies on artificial with the help of sleeve ring and other tools fuel pipe end and air inlet valve pipe end clamping fixed situation, avoid the clamping connection of air inlet valve pipe end and fuel pipe end to appear gap, prevent causing gas leakage, to avoid causing automobile fuel pipe air tightness detection result inaccurate.

Description

Technical Field

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

[0002] Automotive component air tightness testing devices are core equipment for ensuring vehicle safety, performance, and environmental protection. They are widely used in the production and quality inspection of key components such as power systems, braking systems, and fuel systems. In traditional fuel vehicles, leaks in components such as engine blocks, transmission housings, and fuel lines can lead to oil consumption, reduced power, and even safety accidents.

[0003] In existing technologies, when testing the fuel line of a car using air tightness testing equipment, both ends of the fuel line need to be connected to the intake valve pipe of the equipment. The traditional method relies on manual clamping and fixing of the fuel line end and the intake valve pipe end with tools such as collars. This method has some drawbacks: during the process of the intake valve filling the fuel line with air, gaps may appear at the clamping connection between the intake valve pipe end and the fuel line end, resulting in gas leakage and inaccurate air tightness test results. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an airtightness testing device for automotive parts, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides an airtightness testing device for automotive parts, including a testing workbench and an airtightness testing mechanism set on the testing workbench. Support plates are fixedly installed on both sides of the upper end of the testing workbench. An automotive fuel pipe is placed on the upper end of the testing workbench. A connecting cylinder is fixedly sleeved inside the support plate. An air intake valve is provided at one end of the connecting cylinder. A sealing and fixing component is provided between the connecting cylinder and the automotive fuel pipe. The sealing and fixing component is used to seal and install the two ends of the automotive fuel pipe. The sealing and fixing assembly includes a docking cylinder, one end of which has an inner hole, and an inner air inlet pipe is fixedly connected to the inner wall of the inner hole at one end.

[0006] Furthermore, the outer wall of the inner air intake pipe is sleeved on the inner side of both ends of the vehicle fuel pipe, and a through opening is provided on the outer wall of the docking cylinder at one end. A sealing block is fixedly sleeved inside the multiple through openings, and a fixing groove is provided inside the sealing block. A sealing sleeve is fixedly sleeved inside the fixing groove of the sealing block.

[0007] Furthermore, a second compression spring is fixedly installed at one end of the inner side of the sealing sleeve, and a sealing plate is fixedly installed at one end of the second compression spring. The sealing plate is fixedly sleeved on one end of the inner wall of the sealing sleeve. A compression guide rod slides through the sealing plate and the inner side of the sealing sleeve. A compression plate is fixedly installed at one end of the compression guide rod. One side surface of the compression plate is squeezed and extruded onto the outer wall of the end of the vehicle fuel pipe.

[0008] Furthermore, a collar is fixedly sleeved on the outer wall of the docking cylinder, and a first compression spring is fixedly installed on one side of the collar. A movable sleeve is fixedly installed on one end of the first compression spring. A guide extrusion groove is opened on the inner wall of the movable sleeve. The movable sleeve is slidably sleeved on the outer wall of the docking cylinder, and the guide extrusion groove of the movable sleeve is slidably sleeved on one end of the extrusion guide rod.

[0009] Furthermore, an external air pipe is sleeved inside the connecting cylinder, and a threaded groove is opened on the outer wall of one end of the external air pipe. The outer side of the threaded groove is rotatably sleeved inside one end of the docking cylinder, and one end of the docking cylinder and one end of the connecting cylinder are in contact and fit together.

[0010] Furthermore, an installation ring is fixedly fitted to the outer end of the external air pipe away from the threaded groove. The installation ring has an embedded groove inside. One end of the connecting cylinder is fitted inside the embedded groove. A connecting piece is fixedly connected to one end of the connecting cylinder. A fastener is fixedly connected to one side of the connecting piece. One end of the fastener is fixedly installed on the outer wall of the installation ring. An air intake valve is fixedly installed at one end of the installation ring.

[0011] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. This utility model uses a sealing and fixing component to push the movable sleeve towards the collar. During this process, the first compression spring, through its own elasticity, moves from compression to extension, causing the movable sleeve to move closer to the extrusion guide rod. The guide extrusion groove on the inner wall of the movable sleeve extrudes one end of the extrusion guide rod, forcing the extrusion guide rod to slide along the inside of the sealing sleeve towards the center of the docking cylinder. As the extrusion guide rod slides, the extrusion plate presses tightly against the outer wall of the fuel pipe, and together with the sealing surface layer of the outer wall of the inner intake pipe, it contacts the inner side of the fuel pipe, achieving radial sealing and fixing of the fuel pipe. Compared with the traditional method that relies on manual clamping and fixing of the fuel pipe end and the intake valve pipe end with tools such as collars, this method avoids gaps at the clamping connection between the intake valve pipe port and the fuel pipe port, preventing gas leakage and thus avoiding inaccurate fuel pipe air tightness test results.

[0012] 2. Simultaneously, the external air pipe and the docking cylinder are connected by a threaded rotational engagement, forming a stable mechanical connection. The tight fit of the threads ensures the sealing of the connection between the external air pipe and the docking cylinder. The connecting cylinder and the mounting ring are fitted into a groove and secured by fasteners on the connecting plate, ensuring that there is no looseness between the connecting cylinder, the mounting ring, and the external air pipe. At the same time, the groove is fitted tightly and sealed without gaps, improving the sealing performance between the docking cylinder and the air inlet valve and preventing leakage of the detection gas at these connection points. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the automotive fuel pipe, intake valve, and sealing and fixing assembly of this utility model; Figure 3 This is a schematic diagram of the connecting cylinder, air pipe, and threaded groove structure of this utility model. Figure 4 This is a schematic diagram of the sealing and fixing component structure of this utility model; Figure 5 for Figure 4 Enlarged view of part A.

[0015] The labels in the diagram represent: 1. Testing workbench; 2. Air tightness testing mechanism; 3. Support plate; 4. Automotive fuel pipe; 5. Sealing and fixing assembly; 51. Movable sleeve; 52. Collar; 53. Connecting cylinder; 54. First compression spring; 55. Inner hole; 56. Inner air intake pipe; 57. Guide extrusion groove; 58. Through-hole; 59. Extrusion guide rod; 510. Sealing block; 511. Fixing groove; 512. Sealing sleeve; 513. Extrusion piece; 514. Second compression spring; 515. Sealing piece; 6. Intake valve; 62. Mounting ring; 63. Groove; 64. External air pipe; 65. Threaded groove; 7. Connecting cylinder; 71. Fastener; 72. Connecting piece. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] The present invention will be further described below with reference to the embodiments. Example 1:

[0018] Reference Figures 1 to 5 This first embodiment of the present invention discloses an airtightness testing device for automotive parts, including a testing workbench 1 and an airtightness testing mechanism 2 mounted on the testing workbench 1. Support plates 3 are fixedly installed on both sides of the upper end of the testing workbench 1. An automotive fuel pipe 4 is placed on the upper end of the testing workbench 1. A connecting cylinder 7 is fixedly sleeved inside the support plate 3. An intake valve 6 is provided at one end of the connecting cylinder 7. A sealing and fixing assembly 5 is provided between the connecting cylinder 7 and the automotive fuel pipe 4. The sealing and fixing assembly 5 is used to seal and install the two ends of the automotive fuel pipe 4 together. The sealing and fixing assembly 5 seals and installs the two ends of the automotive fuel pipe 4 with the connecting cylinder 7. When valve 6 is opened, the air tightness testing mechanism 2 injects gas at a certain pressure into the fuel line 4 of the car. Then, it uses pressure sensors and other equipment to monitor the changes in gas pressure in the fuel line in real time. The air tightness of the fuel line is judged based on the changes in gas pressure. Common testing methods include differential pressure method, flow method, and negative pressure method. Differential pressure method detects leakage by comparing the pressure changes inside and outside the sealed space. Flow method measures the gas flow rate through the product to detect leakage. Negative pressure method draws the workpiece under test into a negative pressure state and observes whether air leaks in to judge the sealing performance. Air tightness testing equipment is common in existing technologies, such as the Hairis HS-P30 portable air tightness tester. The sealing and fixing assembly 5 includes a docking cylinder 53. One end of the docking cylinder 53 has an inner hole 55. An inner air intake pipe 56 is fixedly connected to one end of the inner wall of the inner hole 55. The outer wall of the inner air intake pipe 56 is sleeved on the inner side of both ends of the vehicle fuel pipe 4. A through-hole 58 is opened through one end of the outer wall of the docking cylinder 53. A sealing block 510 is fixedly sleeved inside the multiple through-holes 58. A fixing groove 511 is opened inside the sealing block 510. A sealing sleeve 512 is fixedly sleeved inside the fixing groove 511 of the sealing block 510.

[0019] A second compression spring 514 is fixedly installed at one end of the inner wall of the sealing sleeve 512. A sealing plate 515 is fixedly installed at one end of the second compression spring 514. The sealing plate 515 is fixedly sleeved on one end of the inner wall of the sealing sleeve 512. A compression guide rod 59 slides through the sealing plate 515 and the inner wall of the sealing sleeve 512. A compression plate 513 is fixedly installed at one end of the compression guide rod 59. One side surface of the compression plate 513 is extruded onto the outer wall of the end of the automobile fuel pipe 4. A collar 52 is fixedly sleeved on the outer wall of the docking cylinder 53. A first compression spring 54 is fixedly installed on one side of the collar 52. A movable sleeve 51 is fixedly installed at one end of the first compression spring 54. A guide compression groove 57 is opened on the inner wall of the movable sleeve 51. The movable sleeve 51 is slidably sleeved on the outer wall of the docking cylinder 53. The guide compression groove 57 of the movable sleeve 51 is slidably sleeved on one end of the compression guide rod 59. In use, when it is necessary to fix the car fuel pipe 4, first, the inner sides of both ends of the car fuel pipe 4 are fitted onto the outer wall of the inner air intake pipe 56, so that the end of the fuel pipe is in a suitable position inside the docking cylinder 53. Then, push the movable sleeve 51 to move towards the collar 52. During this process, the first compression spring 54 will move the movable sleeve 51 closer to the extrusion guide rod 59 due to its own elasticity from compression to extension. The guide extrusion groove 57 on the inner wall of the movable sleeve 51 will extrude extrusion on one end of the extrusion guide rod 59, forcing the extrusion guide rod 59 to slide along the inside of the sealing sleeve 512 towards the center of the docking cylinder 53. As the extrusion guide rod 59 slides, the extrusion piece 513 at one end gradually approaches and extrudes the outer wall of the end of the car fuel pipe 4. The second compression spring 514 stores elastic potential energy. When the movable sleeve 51 moves to the appropriate position, the extrusion piece 513 is pressed tightly against the outer wall of the fuel pipe, and in conjunction with the sealing surface layer of the outer wall of the inner air intake pipe 56, it contacts the inner side of the fuel pipe, realizing radial sealing and fixing of the fuel pipe. Example 2:

[0020] Reference Figures 1 to 3 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: an external air pipe 64 is sleeved inside the connecting cylinder 7. A threaded groove 65 is opened on the outer wall of one end of the external air pipe 64. The outer side of the threaded groove 65 is rotatably sleeved inside one end of the docking cylinder 53. One end of the docking cylinder 53 and one end of the connecting cylinder 7 are in contact and fit together. An installation ring 62 is fixedly sleeved on the outer side of the external air pipe 64 away from the threaded groove 65. An embedded groove 63 is opened inside the installation ring 62. One end of the connecting cylinder 7 is sleeved inside the embedded groove 63. A connecting piece 72 is fixedly connected to one end of the connecting cylinder 7. A fastener 71 is fixedly connected to one side of the connecting piece 72. One end of the fastener 71 is fixedly installed on the outer wall of the installation ring 62. An air inlet valve 6 is fixedly installed on one end of the installation ring 62.

[0021] In use, screw the threaded end of the outer air pipe 64 into the inner end of the docking cylinder 53 until the threads of the outer air pipe 64 and the docking cylinder 53 are fully engaged; then put one end of the connecting cylinder 7 into the groove 63 of the mounting ring 62, so that one end of the connecting cylinder 7 and one end of the docking cylinder 53 come into contact and fit together. Fix the connecting piece 72 to the outer wall of the mounting ring 62 by the fasteners 71 (such as bolts, buckles, etc.) on the connecting piece 72, ensuring that there is no looseness between the connecting piece 7, the mounting ring 62 and the outer air pipe 64, and that the fit at the groove 63 is sealed without gaps. Open the air intake valve 6 and inject the preset pressure of detection gas into the entire detection passage (outer air pipe 64—docking cylinder 53—fuel pipe).

[0022] The remaining structure is the same as that in Example 1.

[0023] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for testing the airtightness of automotive parts, characterized in that: The device includes a testing workbench (1) and an air tightness testing mechanism (2) set on the testing workbench (1). Support plates (3) are fixedly installed on both sides of the upper end of the testing workbench (1). A car fuel pipe (4) is placed on the upper end of the testing workbench (1). A connecting cylinder (7) is fixedly sleeved inside the support plate (3). An air intake valve (6) is provided at one end of the connecting cylinder (7). A sealing and fixing assembly (5) is provided between the connecting cylinder (7) and the car fuel pipe (4). The sealing and fixing assembly (5) is used to seal and install the two ends of the car fuel pipe (4). The sealing and fixing assembly (5) includes a docking cylinder (53), one end of which has an inner hole (55), and an inner air inlet pipe (56) is fixedly connected to the inner wall of the inner hole (55) at one end.

2. The automotive parts airtightness testing device according to claim 1, characterized in that, The outer wall of the inner air intake pipe (56) is fitted inside both ends of the automobile fuel pipe (4). The outer wall of the connecting cylinder (53) is provided with a through-hole (58) at one end. A sealing block (510) is fixedly fitted inside the multiple through-holes (58). A fixing groove (511) is provided inside the sealing block (510). A sealing sleeve (512) is fixedly fitted inside the fixing groove (511) of the sealing block (510).

3. The device for testing the airtightness of automotive parts according to claim 2, characterized in that, A second compression spring (514) is fixedly installed at one end of the inner side of the sealing sleeve (512). A sealing plate (515) is fixedly installed at one end of the second compression spring (514). The sealing plate (515) is fixedly sleeved on one end of the inner wall of the sealing sleeve (512). A compression guide rod (59) slides through the sealing plate (515) and the inner side of the sealing sleeve (512). A compression plate (513) is fixedly installed at one end of the compression guide rod (59). One side surface of the compression plate (513) is squeezed and extruded onto the outer wall of the end of the automobile fuel pipe (4).

4. The airtightness testing device for automotive parts according to claim 3, characterized in that, A collar (52) is fixedly sleeved on the outer wall of the docking cylinder (53). A first compression spring (54) is fixedly installed on one side of the collar (52). A movable sleeve (51) is fixedly installed at one end of the first compression spring (54). A guide extrusion groove (57) is opened on the inner wall of the movable sleeve (51). The movable sleeve (51) is slidably sleeved on the outer wall of the docking cylinder (53). The guide extrusion groove (57) of the movable sleeve (51) is slidably sleeved on one end of the extrusion guide rod (59).

5. The device for testing the airtightness of automotive parts according to claim 1, characterized in that, The connecting cylinder (7) is fitted with an external air pipe (64). A threaded groove (65) is opened on the outer wall of one end of the external air pipe (64). The outer side of the threaded groove (65) is rotatably fitted inside one end of the docking cylinder (53). One end of the docking cylinder (53) is in contact with and fits against one end of the connecting cylinder (7).

6. The automotive parts airtightness testing device according to claim 5, characterized in that, An installation sleeve (62) is fixedly fitted to the outer end of the external air pipe (64) away from the threaded groove (65). The installation sleeve (62) has a groove (63) inside. One end of the connecting cylinder (7) is fitted inside the groove (63). One end of the connecting cylinder (7) is fixedly connected to a connecting piece (72). One side of the connecting piece (72) is fixedly connected to a fastener (71). One end of the fastener (71) is fixedly installed on the outer wall of the installation sleeve (62). One end of the installation sleeve (62) is fixedly installed with an air inlet valve (6).

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