Device for testing leakage in bolt hole of cylinder cover

Abstract

The utility model relates to the technical field of cylinder cover detection, and discloses a cylinder cover bolt hole internal leakage testing device, which comprises a cylinder cover, a leakage testing cylinder body and a C-shaped transparent tube, the inner wall of the right tube of the C-shaped transparent tube is provided with tread limiting rings close to the upper side and the lower side, and an air blocking piece is arranged between the tread limiting rings. The outer sides of the external threads are in threaded connection with threaded sleeves, detachable sealing pipes are slidably installed at the ends, close to each other, of the threaded sleeves, the sealing pipe on the upper side abuts against the outer side of a bolt hole of a cylinder cover, and the sealing pipe on the lower side abuts against the outer side of a bolt hole of a leakage testing cylinder body. And a water injection port is formed in the bent part of the left side of each C-shaped transparent tube. Through changing the relative position between the air blocking member and the air inlet pipe, the leakage test operation can be conveniently carried out on the upper end and the lower end of the bolt hole, the operation process is simplified, the detection efficiency is improved, the reliability of the detection result is ensured, and the risk caused by direct immersion of the cylinder cover is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinder head detection, in particular to a leak detection device inside the bolt holes of a cylinder head. Background Art

[0002] During the manufacturing and maintenance process of an engine, airtightness detection of the bolt holes of the cylinder head and cylinder block is a crucial task. Leakage in the bolt holes of the cylinder head will seriously affect the performance, fuel consumption, service life of components, and driving experience of the engine, and may bring potential safety hazards and environmental pollution problems. Therefore, once a leakage problem is found, it should be repaired and eliminated in time.

[0003] Traditional detection methods usually directly place the cylinder head into water, and judge whether there is air leakage in the bolt holes by observing whether there are bubbles emerging under pressure. However, this method has some deficiencies. For example, directly placing the cylinder head into water requires a large amount of time and manpower, the operation is cumbersome and the efficiency is low. Secondly, the cylinder head may be eroded by water during the immersion process, causing unnecessary damage, increasing the subsequent drying step, and further reducing the work efficiency. At the same time, if the cylinder head is soaked in water for a long time, it may also cause the internal components to rust or corrode, posing a potential threat to the performance and service life of the engine. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a leak detection device inside the bolt holes of a cylinder head, which has the advantages of higher efficiency and more comprehensive and reliable leak detection results, and solves the problem that the cylinder head is easily damaged by directly immersing it in water.

[0005] The utility model provides the following technical solution: A leak detection device inside the bolt holes of a cylinder head, including a cylinder head, a leak detection cylinder block, and a C-shaped transparent tube. A leak detection bolt penetrates and is threadedly connected inside the bolt holes between the cylinder head and the leak detection cylinder block. Ladder surface limiting rings are arranged on the inner walls of the right tube of the C-shaped transparent tube near the upper and lower sides. A gas blocking member is placed between the ladder surface limiting rings. External threads are arranged at the upper and lower ends of the C-shaped transparent tube near the openings. Threaded sleeves are threadedly connected to the outside of the external threads. Removable sealing tubes are slidably installed at the adjacent ends between the threaded sleeves. The upper sealing tube abuts against the outside of the bolt hole of the cylinder head, and the lower sealing tube abuts against the outside of the bolt hole of the leak detection cylinder block. Water injection ports are arranged at the bent parts on the left side of the C-shaped transparent tube.

[0006] Furthermore, the upper and lower outer walls of the gas blocking member are adapted to the inner walls of the ladder surface limiting rings, and the minimum diameter of the ladder surface limiting ring is smaller than the maximum diameter of the gas blocking member.

[0007] Further, the outer wall of the sealing tube fits with the inner wall of the threaded sleeve. A retaining ring is provided on the inner wall of the threaded sleeve near the opening, and a sealing ring is fixedly installed at the lower end position on the inner wall of the sealing tube.

[0008] Further, rubber plugs are provided at the water injection ports. At one end of each rubber plug inside the C-shaped transparent tube, an adherent pad is fixedly connected, and the adherent pad fits with the C-shaped transparent tube.

[0009] Further, at one end of each rubber plug outside the C-shaped transparent tube, a fixing rod is fixedly connected, and the cross-sectional area of the fixing rod is smaller than the opening area of the water injection port.

[0010] Further, an intake pipe is provided at the middle position of the right end of the C-shaped transparent tube and is connected. The cylinder head and the leak test cylinder body are fixedly connected by leak test bolts, and a cylinder head gasket is placed between the cylinder head and the leak test cylinder body.

[0011] Compared with the prior art, the present utility model has the following beneficial effects:

[0012] 1. By changing the relative position between the air blocking member and the intake pipe, the present device can conveniently perform leak tests on the upper and lower ends of the bolt hole, which not only simplifies the operation process, improves the detection efficiency, but also ensures the reliability of the detection results.

[0013] 2. Through the water injection port, rubber plug, adherent pad and fixing rod, clean water can be conveniently and quickly added to the bolt hole covered by the sealing tube. Compared with the traditional method of directly placing the cylinder head underwater, it saves time and effort, and there is no need for subsequent drying operation of the cylinder head, avoiding the risks caused by the cylinder head being immersed in water, and is safer and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is the internal structural schematic diagram of the present utility model;

[0016] Figure 3 is the partial cross-sectional structural schematic diagram of the present utility model;

[0017] Figure 4 is of the present utility model Figure 3 magnified structural schematic diagram at A in.

[0018] In the figure: 1. Cylinder head; 2. Leak detection cylinder block; 3. Leak detection bolt; 4. C-shaped transparent tube; 5. Step surface limit ring; 6. Air blocking part; 7. External thread; 8. Thread sleeve; 9. Sealing tube; 10. Retaining ring; 11. Sealing ring; 12. Water injection port; 13. Rubber plug; 14. Wall-attached pad; 15. Fixed rod; 16. Air inlet pipe; 17. Cylinder head gasket. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-4 , a leak detection device inside the bolt hole of the cylinder head, including a cylinder head 1, a leak detection cylinder block 2 and a C-shaped transparent tube 4. A leak detection bolt 3 is penetrated and threadedly connected in the bolt hole between the cylinder head 1 and the leak detection cylinder block 2. Step surface limit rings 5 are arranged on the inner walls of the right tubes of the C-shaped transparent tube 4 near the upper and lower sides. An air blocking part 6 is placed between the step surface limit rings 5. External threads 7 are arranged at the upper and lower ends of the C-shaped transparent tube 4 near the openings. Threaded sleeves 8 are threadedly connected to the outside of the external threads 7. Removable sealing tubes 9 are slidably installed at the adjacent ends between the threaded sleeves 8. The upper sealing tube 9 abuts against the outside of the bolt hole of the cylinder head 1, and the lower sealing tube 9 abuts against the outside of the bolt hole of the leak detection cylinder block 2. Water injection ports 12 are arranged at the bent parts on the left side of the C-shaped transparent tube 4. After connecting the air inlet pipe 16 to the air supply device, when the air blocking part 6 is located above the air inlet pipe 16, when inflating by opening the air supply device, the air blocking part 6 will be closely attached to the upper step surface limit ring 5 under the action of wind pressure to complete the sealing of the upper end of the C-shaped transparent tube 4, so as to guide the air flow downward. After passing through the through holes of the lower step surface limit ring 5, it finally blows to the bolt hole of the leak detection cylinder block 2. After separating the rubber plug 13 from the water injection port 12 by pressing the upper fixed rod 15 and entering the inside of the C-shaped transparent tube 4, the finally added water converges at the upper end of the bolt hole of the cylinder head 1. Thus, it can be judged whether there is air leakage at this place by observing whether there are bubbles emerging from the upper end of the bolt hole. After closing the air supply device, the air blocking part 6 can be slid to the lower side position of the air inlet pipe 16 by means of inclination and other methods using the gravity effect. Repeating the above steps, it can be detected whether there is air leakage at the lower end of the bolt hole. This device can perform leak detection operations on both the upper and lower ends of the bolt hole by changing the relative position between the air blocking part 6 and the air inlet pipe 16. The operation is simple and convenient, and at the same time, the reliability of the detection result is ensured.

[0021] Please refer to Figures 1-3, the upper and lower outer walls of the air-blocking member 6 are adapted to the inner wall of the step surface limiting ring 5, and the minimum diameter of the step surface limiting ring 5 is smaller than the maximum diameter of the air-blocking member 6, ensuring the rationality of the structural design.

[0022] Please refer to Figure 4 , the outer wall of the sealing pipe 9 fits with the inner wall of the threaded sleeve 8. A retaining ring 10 is provided on the inner wall of the threaded sleeve 8 near the opening. A sealing ring 11 is fixedly installed on the inner wall of the sealing pipe 9 near the lower end. First, tighten the leak test bolts 3 in the corresponding bolt holes of the cylinder head 1 and the leak test cylinder block 2 according to the requirements of the installation and adjustment instructions. Insert the sealing pipe 9 into the threaded sleeve 8 and align the sealing pipe 9 with the bolt hole. Then rotate the threaded sleeve 8 to move it towards the bolt hole, so that the retaining ring 10 can drive the sealing pipe 9 to move downward. Finally, the sealing pipe 9 can be pressed tightly against the cylinder head 1 or the leak test cylinder block 2, and the sealing environment is ensured by the setting of the sealing ring 11.

[0023] Please refer to Figure 4 , rubber plugs 13 are provided at the water injection ports 12. One end of each rubber plug 13 inside the C-shaped transparent tube 4 is fixedly connected with a wall-attached pad 14, and the wall-attached pad 14 fits with the C-shaped transparent tube 4. One end of each rubber plug 13 outside the C-shaped transparent tube 4 is fixedly connected with a fixing rod 15, and the cross-sectional area of the fixing rod 15 is smaller than the opening area of the water injection port 12. Since the fixing rod 15 is smaller than the opening of the water injection port 12, clean water can be injected into the C-shaped transparent tube 4 through the water injection port 12. After adding water, pull the fixing rod 15 outwards to make the rubber plug 13 plug the water injection port 12 again, and the sealing effect is ensured by the fit between the wall-attached pad 14 and the C-shaped transparent tube 4, and the limiting function is also achieved to prevent it from falling off during the pressurization process. Through the water injection port 12, the rubber plug 13, the wall-attached pad 14 and the fixing rod 15, clean water can be conveniently and quickly added to the bolt hole covered by the sealing pipe 9. Compared with the traditional method of directly placing the cylinder head 1 underwater, it saves time and effort, and there is no need for subsequent drying operation of the cylinder head 1, avoiding the risks caused by the cylinder head 1 being immersed in water, and is safer and more efficient.

[0024] Please refer to Figures 1-2 , an air inlet pipe 16 is provided at the middle of the right end of the C-shaped transparent tube 4. The cylinder head 1 and the leak test cylinder block 2 are fixedly connected by leak test bolts 3. A cylinder head gasket 17 is placed between the cylinder head 1 and the leak test cylinder block 2. Pressurization leak test is carried out by connecting the air inlet pipe 16 with a gas supply device. The sealing performance between the cylinder head 1 and the leak test cylinder block 2 can be improved through the cylinder head gasket 17, simulating the actual working environment and improving the accuracy and authenticity of the leak test detection.

[0025] Working principle: First, tighten the leak test bolts 3 in the corresponding bolt holes of the cylinder head 1 and the leak test cylinder block 2 according to the requirements of the assembly and adjustment instructions. Insert the sealing pipe 9 into the internal thread sleeve 8 and align the sealing pipe 9 with the bolt hole. Then rotate the thread sleeve 8 to make it move towards the bolt hole, so that the sealing pipe 9 can be driven to move downward by the retaining ring 10. Finally, the sealing pipe 9 can be pressed tightly against the cylinder head 1 or the leak test cylinder block 2, and the sealing environment is ensured through the setting of the sealing ring 11. After connecting the air inlet pipe 16 with the air supply device, when the air blocking part 6 is located at the upper side position of the air inlet pipe 16, when inflating by opening the air supply device, the air blocking part 6 will be closely attached to the upper stepped surface limit ring 5 under the action of the wind pressure to complete the sealing of the upper end of the C-shaped transparent pipe 4, so as to guide the air flow downward. After passing through the through hole of the lower stepped surface limit ring 5, it finally blows to the bolt hole of the leak test cylinder block 2. By pressing the upper fixing rod 15 to separate the rubber plug 13 from the water injection port 12 and enter the internal part of the C-shaped transparent pipe 4, since the fixing rod 15 is smaller than the opening of the water injection port 12, clear water can be injected into the internal part of the C-shaped transparent pipe 4 through the water injection port 12. After adding water, pull the fixing rod 15 outwards to make the rubber plug 13 plug the water injection port 12 again, and the sealing effect is ensured through the fitting between the wall attachment pad 14 and the C-shaped transparent pipe 4, and the limiting effect is also achieved to avoid falling off during the pressurization process. Finally, the added water converges at the upper end of the bolt hole of the cylinder head 1, so that it can be judged whether there is air leakage at this place by observing whether there are bubbles emerging from the upper end of the bolt hole. After closing the air supply device, the air blocking part 6 can be made to slide to the lower side position of the air inlet pipe 16 by means of inclination and other methods using the gravity effect. Repeating the above steps, it can be detected whether there is air leakage at the lower end of the bolt hole. This device can perform leak tests on both the upper and lower ends of the bolt hole by changing the relative position between the air blocking part 6 and the air inlet pipe 16. The operation is simple and convenient, and at the same time, the reliability of the detection result is ensured. In addition, through the water injection port 12, the rubber plug 13, the wall attachment pad 14 and the fixing rod 15, clear water can be added to the bolt hole covered by the sealing pipe 9 quickly and conveniently. Compared with the traditional method of directly placing the cylinder head 1 underwater, it saves time and effort, and there is no need for subsequent drying operation of the cylinder head 1, avoiding the risks caused by the cylinder head 1 being immersed in water, and is safer and more efficient.

Claims

1. A cylinder head bolt hole leak testing device, comprising a cylinder head (1), a leak testing cylinder body (2) and a C-shaped transparent tube (4), characterized in that: A leak test bolt (3) penetrates through and is threadedly connected to the bolt hole between the cylinder cover (1) and the leak test cylinder body (2); the inner wall of the right tube of the C-shaped transparent tube (4) is provided with a stepped limit ring (5) near the upper and lower sides; a gas blocking member (6) is placed between the stepped limit rings (5); the upper and lower ends of the C-shaped transparent tube (4) are provided with external threads (7) near the opening; the outer sides of the external threads (7) are threadedly connected with threaded sleeves (8); a detachable sealing tube (9) is slidably installed at the ends close to the threaded sleeves (8); the upper side of the sealing tube (9) is pressed against the outer side of the bolt hole of the cylinder cover (1); the lower side of the sealing tube (9) is pressed against the outer side of the bolt hole of the leak test cylinder body (2); and the C-shaped transparent tube (4) is provided with a water injection port (12) at the left bend.

2. A cylinder head bolt hole leak testing device according to claim 1, characterized in that: The upper and lower outer walls of the gas blocking member (6) are both matched with the inner wall of the stepped surface limiting ring (5), and the minimum diameter of the stepped surface limiting ring (5) is smaller than the maximum diameter of the gas blocking member (6).

3. A cylinder head bolt hole leak testing device according to claim 1, characterized in that: The outer wall of the sealing tube (9) fits with the inner wall of the threaded sleeve (8), a retaining ring (10) is provided on the inner wall of the threaded sleeve (8) near the opening, and a sealing ring (11) is fixedly installed on the inner wall of the sealing tube (9) near the lower end.

4. A cylinder head bolt hole leak testing device according to claim 1, characterized in that: The water injection port (12) is provided with a rubber plug (13), and one end of the rubber plug (13) inside the C-shaped transparent tube (4) is fixedly connected to a wall-adhering pad (14), and the wall-adhering pad (14) is in close contact with the C-shaped transparent tube (4).

5. A cylinder head bolt hole leak testing device according to claim 4, characterized in that: One end of the rubber stopper (13) outside the C-shaped transparent tube (4) is fixedly connected to a fixing rod (15), and the cross-sectional area of ​​the fixing rod (15) is smaller than the opening area of ​​the water injection port (12).

6. A cylinder head bolt hole leak testing device according to claim 1, characterized in that: A connected air intake pipe (16) is arranged in the middle of the right end of the C-shaped transparent tube (4); the cylinder cover (1) and the leak test cylinder body (2) are fixedly connected by leak test bolts (3); and a cylinder mattress (17) is placed between the cylinder cover (1) and the leak test cylinder body (2).

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