An exhaust pipe air tightness detection device

Abstract

The utility model relates to a kind of exhaust pipe air tightness detection device, belong to air tightness detection technical field.The exhaust pipe air tightness detection device, including: workbench, air tightness detector and detection table, the air tightness detector and detection table are installed in the top of workbench;Sealing mechanism, the sealing mechanism includes the cylinder fixedly connected in the top of detection table, the telescopic end of the cylinder and the top of detection table are all fixedly connected with round plate;Sealing ring in plugging mechanism can be periodically replaced, it is favorable to guarantee the plugging effect of sealing ring to exhaust pipe opening driven by plugging plate, and while plugging plate drives sealing ring to carry out the plugging of exhaust pipe opening, by making the air bag between adjacent two sealing rings inflate and closely adhere to the inner wall of exhaust pipe, it is favorable to guarantee the sealing property when plugging exhaust pipe opening, avoid the phenomenon that exhaust pipe appears leakage at opening during air tightness detection process of exhaust pipe, to ensure the accuracy of exhaust pipe air tightness detection.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, and in particular to an exhaust pipe airtightness testing device. Background Technology

[0002] The exhaust pipe is a key component of the engine exhaust system. The airtightness requirements of the exhaust pipe are high. Therefore, airtightness testing is required during the production of the exhaust pipe. Currently, the existing technology usually uses an airtightness tester to test the airtightness of the exhaust pipe. The airtightness tester tests the exhaust pipe by filling it with compressed air and monitoring the changes in air pressure in the exhaust pipe in real time.

[0003] When testing an exhaust pipe with an airtightness tester, a sealing ring is inserted into the opening of the exhaust pipe to seal it. However, the sealing ring is prone to wear after repeated use, which reduces the sealing performance when the sealing ring is used, making it easy for air to leak during the sealing process, thus affecting the accuracy of the exhaust pipe airtightness test. Utility Model Content

[0004] Therefore, it is necessary to provide an exhaust pipe air tightness testing device to address the problem that the sealing ring is easily worn after repeated use, which leads to a decrease in the sealing performance of the sealing ring during sealing and easy air leakage during the sealing process, thus affecting the accuracy of exhaust pipe air tightness testing.

[0005] Includes: a workbench, an airtightness tester, and a testing platform, wherein the airtightness tester and testing platform are installed on the top of the workbench; A sealing mechanism includes a cylinder fixedly connected to the top of the testing platform. A circular plate is fixedly connected to both the telescopic end of the cylinder and the top of the testing platform. A sealing plate is fixedly connected to one end of each of the two circular plates. The inflation tube of the airtightness tester passes through one of the sealing plates. Three sealing rings are installed on the surface of the sealing plate, and two airbags are fixedly connected to the surface of the sealing plate. The two airbags are respectively disposed between two adjacent sealing rings.

[0006] In one embodiment, the sealing mechanism further includes an electric push rod fixedly connected to the top of the testing platform. An air storage tank is fixedly connected to the top of the testing platform. One end of the air storage tank is connected to a T-connector, and the other two ends of the T-connector pass through two sealing plates respectively. A circular tube connects the airbag to the T-connector. A piston plate is slidably connected to the inner wall of the air storage tank. The telescopic end of the electric push rod passes through the air storage tank and is fixedly connected to one side of the piston plate. This facilitates the simultaneous inflation of multiple airbags.

[0007] In one embodiment, two placement plates are fixedly connected to the top of the testing platform. A limit rod is installed at the top of one of the placement plates, and the limit rod is U-shaped. This prevents the exhaust pipe from being squeezed and deformed when one of the circular plates pulls the sealing plate and its corresponding sealing ring into the exhaust pipe.

[0008] In one embodiment, a sealing gasket is fixedly connected to the end of one of the sealing rings away from the airbag. The surface of the sealing gasket is inclined to enhance the sealing effect and facilitate the sealing plate to drive the sealing ring and sealing gasket into the exhaust pipe more effectively.

[0009] In one embodiment, the sealing ring has a convex cross-section, and the surface of the sealing plate has three annular grooves. This facilitates better installation of the sealing ring onto the sealing plate.

[0010] In one embodiment, one of the placement plates has two locking holes at its top. The limiting rod is installed on one of the placement plates through these locking holes, and the diameter of the locking holes matches the diameter of the limiting rod. This ensures the stability of the limiting rod when installed on one of the placement plates.

[0011] In one embodiment, the lower end of the surface of the limiting rod forms an angle with the horizontal plane, and the upper end of the inner wall of the locking hole is inclined. This facilitates better entry of the end of the limiting rod into the locking hole.

[0012] In one embodiment, the middle section of one end of the tee is corrugated, and the tee is a rubber component. This ensures the stability of the connection between the internal circular tube of the sealing plate and the tee when one of the sealing plates moves.

[0013] Beneficial effects 1. The sealing rings in the above-mentioned sealing mechanism can be replaced periodically, which helps to ensure the sealing effect of the sealing plate driving the sealing rings on the exhaust pipe opening. At the same time, the sealing plate drives the sealing rings to seal the exhaust pipe opening, and by inflating the air bladder between two adjacent sealing rings and making it tightly fit against the inner wall of the exhaust pipe, it helps to ensure the sealing performance when sealing the exhaust pipe opening, and avoids air leakage at the exhaust pipe opening during the air tightness test, thereby ensuring the accuracy of the exhaust pipe air tightness test.

[0014] 2. The setting of the limit rod is beneficial to limit the installation part of the exhaust pipe, and avoid the exhaust pipe being squeezed and deformed when one of the circular plates drives the sealing plate and the corresponding sealing ring into the exhaust pipe. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of the sealing mechanism of this utility model; Figure 3 This is a schematic diagram of the sealing mechanism of this utility model; Figure 4 Exploded view of the circular plate, sealing plate, limiting rod, and locking hole of this utility model; Figure 5 This is an exploded view of the sealing plate, sealing ring, and sealing gasket of this utility model.

[0017] Figure label: 100. Workbench; 200. Air tightness tester; 300. Test platform; 400. Sealing mechanism; 410. Cylinder; 420. Circular plate; 430. Sealing plate; 431. Annular groove; 440. Sealing ring; 450. Airbag; 460. Air tank; 461. T-pipe; 462. Circular pipe; 463. Piston plate; 470. Electric push rod; 480. Sealing gasket; 490. Placement plate; 491. Limiting rod; 492. Locking hole. Detailed Implementation

[0018] 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.

[0019] The following is combined Figures 1-5 This invention describes an exhaust pipe airtightness testing device.

[0020] In one embodiment, an exhaust pipe airtightness testing device includes: a workbench 100, an airtightness tester 200, and a testing platform 300, wherein the airtightness tester 200 and the testing platform 300 are mounted on the top of the workbench 100. The sealing mechanism 400 includes a cylinder 410 fixedly connected to the top of the test platform 300. The telescopic end of the cylinder 410 and the top of the test platform 300 are both fixedly connected to a circular plate 420. One end of each of the two circular plates 420 is fixedly connected to a sealing plate 430. The inflation tube of the air tightness tester 200 passes through one of the sealing plates 430. Three sealing rings 440 are installed on the surface of the sealing plate 430, and two airbags 450 are fixedly connected to the surface of the sealing plate 430. The two airbags 450 are respectively disposed between two adjacent sealing rings 440.

[0021] In this embodiment, one circular plate 420 is fixed, and the end of the other circular plate 420 away from the sealing plate 430 is fixedly connected to the telescopic end of the cylinder 410. After the opening at one end of the exhaust pipe is first installed with the sealing plate 430 at one end of the fixed circular plate 420, the opening at the other end of the exhaust pipe is located on the same axis as the other sealing plate 430.

[0022] After the sealing ring 440 and the sealing plate 430 are installed, they form a whole. When the opening of the exhaust pipe is blocked, the sealing plate 430 will drive the sealing ring 440 to be inserted into the opening of the exhaust pipe, and the surface of the sealing ring 440 will fit against the inner wall of the exhaust pipe.

[0023] It should be noted that the air tightness tester 200 can be the JC-HH100 series air tightness tester from the existing technology. When the air tightness tester 200 performs the test, compressed air or nitrogen is filled into the exhaust pipe. The pressure range is set according to the specific value based on the exhaust pipe material and design requirements. After the filling stops, the system maintains stable air pressure and monitors the air pressure change in real time to perform the air tightness test. After the test is completed, the air tightness tester 200 slowly releases the pressure in the exhaust pipe.

[0024] like Figure 3 , Figure 4 and Figure 5 As shown, the sealing mechanism 400 also includes an electric push rod 470 fixedly connected to the top of the testing platform 300. An air storage box 460 is fixedly connected to the top of the testing platform 300. One end of the air storage box 460 is connected to a three-way pipe 461. The other two ends of the three-way pipe 461 pass through the two sealing plates 430 respectively. A round pipe 462 connects the airbag 450 and the three-way pipe 461. A piston plate 463 is slidably connected to the inner wall of the air storage box 460. The telescopic end of the electric push rod 470 passes through the air storage box 460 and is fixedly connected to one side of the piston plate 463.

[0025] In this embodiment, the gas storage tank 460 is filled with a gas medium. When the sealing plate 430 drives the airbag 450 into the exhaust pipe, the gas content in the gas storage tank 460 is greater than the gas content required for the four airbags 450 to expand. Therefore, the gas in the gas storage tank 460 is squeezed into the four airbags 450, and the gas is sufficient to make the airbags 450 expand and fit against the inner wall of the exhaust pipe.

[0026] A pressure gauge is installed on the surface of the three-way pipe 461. When the device is running, when the sealing plate 430 drives the airbag 450 into the exhaust pipe, the controller starts the electric push rod 470. The telescopic end of the electric push rod 470 pushes the piston plate 463 to move and compress the gas in the air tank 460. The compressed gas enters the airbag 450 through the three-way pipe 461 and the round pipe 462, causing the airbag 450 to inflate. After the piston plate 463 continues to move and the airbag 450 completes its expansion and adheres to the inner wall of the exhaust pipe, the pressure of the gas in the three-way pipe 461 will increase. When the pressure gauge shows that the pressure of the gas in the three-way pipe 461 has increased, the operation of the electric push rod 470 is turned off.

[0027] like Figure 3 and Figure 4 As shown, two placement plates 490 are fixedly connected to the top of the testing platform 300. A limiting rod 491 is installed at the top of one of the placement plates 490, and the limiting rod 491 is U-shaped. Two locking holes 492 are provided at the top of one of the placement plates 490. The limiting rod 491 is installed to one of the placement plates 490 through the locking holes 492, and the diameter of the locking holes 492 matches the diameter of the limiting rod 491. The lower end of the surface of the limiting rod 491 forms an angle with the horizontal plane, and the upper end of the inner wall of the locking hole 492 is inclined.

[0028] In this embodiment, when testing the exhaust pipe, the mounting parts at both ends of the exhaust pipe are placed on two mounting plates 490 respectively, and after placement, the center of the opening at both ends of the exhaust pipe and the center of the two sealing plates 430 are on the same horizontal plane.

[0029] After installing the opening at one end of the exhaust pipe with the fixed sealing plate 430, install the limiting rod 491 with the placement plate 490 near the cylinder 410. At this time, the limiting rod 491 will limit the installation part of the exhaust pipe near the cylinder 410, thereby preventing the exhaust pipe from moving away from the cylinder 410.

[0030] like Figure 5 As shown, a sealing gasket 480 is fixedly connected to one end of a sealing ring 440 away from the airbag 450, and the surface of the sealing gasket 480 is inclined.

[0031] In this embodiment, a sealing gasket 480 is installed on the sealing ring 440 away from the circular plate 420. The sealing gasket 480 is a rubber component, and the maximum diameter of the sealing gasket 480 is the same as the diameter of the sealing ring 440. The end of the sealing gasket 480 near the sealing ring 440 is in contact with the end of the sealing plate 430 away from the circular plate 420.

[0032] like Figure 5 As shown, the vertical cross-section of the sealing ring 440 is convex, and the surface of the sealing plate 430 has three annular grooves 431.

[0033] In this embodiment, the sealing ring 440 is a rubber component. When the sealing ring 440 is installed with the sealing plate 430, the protruding part of the inner surface of the sealing ring 440 is inserted into the annular groove 431. After insertion, the inner surface of the sealing ring 440 is in contact with the surface of the sealing plate 430. When the sealing ring 440 needs to be replaced, the protruding part of the inner surface of the sealing ring 440 is removed from the annular groove 431 and a new sealing ring 440 is installed.

[0034] like Figure 4 As shown, the middle part of one end of the tee pipe 461 is set as a corrugated pipe, and the tee pipe 461 is a rubber component. When the movable sealing plate 430 moves horizontally, the corrugated part of the tee pipe 461 contracts synchronously.

[0035] Working principle: When performing an airtightness test on the exhaust pipe, place the mounting parts at both ends of the exhaust pipe on two mounting plates 490 respectively. First, install the opening at one end of the exhaust pipe with the sealing plate 430 at one end of the fixed circular plate 420. During installation, the sealing plate 430, the corresponding sealing ring 440, and the airbag 450 at one end of the fixed circular plate 420 are inserted into the exhaust pipe. When one end of the exhaust pipe is pressed against one end of the fixed circular plate 420, the limiting rod 491 is then installed with the mounting plate 490 near the cylinder 410 to limit the mounting part at one end of the exhaust pipe. After this operation is completed, the controller starts the cylinder 410. The extension end of the cylinder 410 pushes the other circular plate 420, causing the sealing plate 430 to enter the opening at the other end of the exhaust pipe. When the moving circular plate 420 is pressed against the other end of the exhaust pipe... When the cylinder 410 is closed, the two circular plates 420 and the corresponding sealing plates 430 seal the openings at both ends of the exhaust pipe, and the surfaces of the multiple sealing rings 440 are in contact with the inner wall of the exhaust pipe. After this operation is completed, the electric push rod 470 is started by the controller. The telescopic end of the electric push rod 470 pushes the piston plate 463 to move and compress the gas in the gas storage tank 460. The compressed gas enters the four air bags 450 through the three-way pipe 461 and the circular pipe 462, causing the four air bags 450 to expand and be in contact with the inner walls at both ends of the exhaust pipe opening. After the air bags 450 have expanded, the electric push rod 470 is closed. At this time, the sealing of the openings at both ends of the exhaust pipe is completed. After the sealing is completed, gas is injected into the exhaust pipe through the inflation pipe of the air tightness tester 200 and the air tightness test is performed.

[0036] It should be noted that the cylinder 410 and other components mentioned above are all devices with relatively mature existing technologies. The specific model can be selected according to actual needs. At the same time, the cylinder 410 can be powered by an internal power supply or by AC power. The specific power supply method should be selected according to the situation, which will not be elaborated here.

[0037] 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 spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for detecting the airtightness of an exhaust pipe, characterized in that, include: A workbench (100), an airtightness tester (200), and a testing platform (300), wherein the airtightness tester (200) and the testing platform (300) are installed on the top of the workbench (100); A sealing mechanism (400) includes a cylinder (410) fixedly connected to the top of the test platform (300). The telescopic end of the cylinder (410) and the top of the test platform (300) are both fixedly connected to a circular plate (420). One end of each of the two circular plates (420) is fixedly connected to a sealing plate (430). The inflation tube of the air tightness tester (200) passes through one of the sealing plates (430). Three sealing rings (440) are installed on the surface of the sealing plate (430), and two airbags (450) are fixedly connected to the surface of the sealing plate (430). The two airbags (450) are respectively disposed between two adjacent sealing rings (440).

2. The exhaust pipe airtightness testing device according to claim 1, characterized in that, The sealing mechanism (400) also includes an electric push rod (470) fixedly connected to the top of the testing platform (300). The top of the testing platform (300) is fixedly connected to an air storage box (460). One end of the air storage box (460) is connected to a three-way pipe (461). The other two ends of the three-way pipe (461) pass through two sealing plates (430) respectively. A round pipe (462) connects the airbag (450) and the three-way pipe (461). A piston plate (463) is slidably connected to the inner wall of the air storage box (460). The telescopic end of the electric push rod (470) passes through the air storage box (460) and is fixedly connected to one side of the piston plate (463).

3. The exhaust pipe airtightness testing device according to claim 1, characterized in that, The top of the testing platform (300) is fixedly connected to two placement plates (490), one of which is equipped with a limiting rod (491) at its top. The limiting rod (491) is U-shaped.

4. The exhaust pipe airtightness testing device according to claim 1, characterized in that, One of the sealing rings (440) is fixedly connected to a sealing gasket (480) at one end away from the airbag (450), and the surface of the sealing gasket (480) is inclined.

5. The exhaust pipe airtightness testing device according to claim 1, characterized in that, The vertical cross-section of the sealing ring (440) is convex, and the surface of the sealing plate (430) has three annular grooves (431).

6. The exhaust pipe airtightness testing device according to claim 3, characterized in that, One of the placement plates (490) has two locking holes (492) at its top. The limiting rod (491) is installed on one of the placement plates (490) through the locking holes (492). The diameter of the locking holes (492) matches the diameter of the limiting rod (491).

7. The exhaust pipe airtightness testing device according to claim 6, characterized in that, The lower end of the surface of the limiting rod (491) forms an angle with the horizontal plane, and the upper end of the inner wall of the card hole (492) is inclined.

8. The exhaust pipe airtightness testing device according to claim 2, characterized in that, The middle part of one end of the tee (461) is set as a corrugated pipe, and the tee (461) is a rubber component.

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