Sealing performance detection device for cylinder cover
By designing a cylinder head sealing test device and employing heating and gas detection methods, the inaccuracy in determining the location of cylinder head cooling water channel leaks and the high-temperature simulation problem were solved, achieving accurate sealing test and improving the reliability of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2026-04-14
AI Technical Summary
Existing technologies cannot accurately determine the location of leaks in the cylinder head cooling water passages, nor can they realistically simulate the sealing performance under high-temperature operating conditions, resulting in potential leaks not being detected in time due to thermal expansion and contraction.
A cylinder head sealing test device was designed, which includes a water tank, a heating device, a gas source and a temperature sensor. The device heats the water to the working temperature, uses gas to enter the water channel to detect leaks, and monitors the temperature in real time, dynamically adjusting the heating power to simulate actual working conditions.
Accurately pinpointing the leak location avoids detection errors caused by thermal expansion and contraction, ensuring the cylinder head undergoes sealing testing under simulated temperature conditions, thus improving the accuracy and reliability of the test.
Smart Images
Figure CN224122107U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of airtightness testing, and in particular to a cylinder head sealing testing device. Background Technology
[0002] Currently, the engine cylinder head, as a critical component, not only bears cylinder pressure and seals the combustion chamber, but also needs to work with the cooling system to maintain the engine's thermal balance. The cylinder head often contains cooling water channels to cool high-temperature areas. These channels are isolated from other parts of the engine and operate under high-temperature, high-pressure conditions for extended periods; their sealing performance directly affects the engine's thermal management capabilities and operational safety.
[0003] Currently, the sealing performance of the cooling water passages in cylinder heads is often tested using a dry airtightness test method. This involves placing the cylinder head in air, filling the cooling water passages with air, and using a pressure sensor to detect changes in the air pressure in the cooling water passages.
[0004] The aforementioned technologies have several drawbacks. They cannot directly determine the location of leaks and cannot accurately simulate the sealing performance of cylinder head cooling channels under high-temperature operating conditions, which can lead to potential leaks due to thermal expansion and contraction going undetected in a timely manner. Utility Model Content
[0005] In order to accurately determine the location of leaks in the cylinder head's water passages and avoid detection errors due to thermal expansion and contraction, this application provides a cylinder head sealing performance testing device.
[0006] The cylinder head sealing performance testing device provided in this application adopts the following technical solution:
[0007] A cylinder head sealing performance testing device, comprising:
[0008] A water tank is used to hold the cylinder head under test. During testing, the water tank is filled with test water that covers the cylinder head under test.
[0009] A heating device is installed in the water tank to heat the test water in the water tank during testing to simulate the working temperature of the cylinder head under test.
[0010] An air source is connected to the air inlet of the water channel of the cylinder head under test via an air pipe, and a base plate is provided on the air outlet of the water channel of the cylinder head under test. The air source is used to circulate air into the water channel of the cylinder head under test to test the sealing performance of the cylinder head under test.
[0011] By adopting the above technical solution, the leakage location of the cylinder head under test can be accurately determined, the working temperature of the cylinder head under test can be simulated, and the detection error caused by thermal expansion and contraction can be avoided.
[0012] Optionally, it also includes a control box and a temperature sensor electrically connected to the control box. The control box is fixed to the outer wall of the water tank, and the temperature sensor is placed inside the water tank to read the temperature of the detection water in the water tank.
[0013] By adopting the above technical solution, the temperature of the testing water is monitored in real time to ensure that the cylinder head under test is in the temperature environment required for testing.
[0014] Optionally, the control box is electrically connected to the heating device for controlling the power of the heating device.
[0015] By adopting the above technical solution, the heating power is dynamically adjusted to maintain a constant temperature of the test water, thereby reducing the interference of temperature fluctuations on the sealing test of the cylinder head under test.
[0016] Optionally, the heating device is a heating rod, and the outer wall of the water tank is provided with an opening. The heating rod extends into the water tank through the opening and is fixed to the outer wall of the water tank. A sealing ring is provided between the heating rod and the opening.
[0017] By adopting the above technical solution, the heating rod is directly immersed in the test water, resulting in high heat conduction efficiency; the sealing ring prevents water leakage and improves the overall sealing and safety of the device.
[0018] Optionally, the heating device includes multiple heating units, which are evenly distributed on the inner wall of the water tank.
[0019] By adopting the above technical solution, the test water is heated evenly, avoiding local temperature differences and ensuring that the cylinder head under test is heated evenly, simulating the real temperature distribution; the redundant design (when a single heating unit is damaged, the other multiple heating units can still work) improves the reliability and fault tolerance of the device.
[0020] Optionally, a drain basket is also included for accommodating the cylinder head under test, wherein the drain basket is located in the water tank during testing.
[0021] By adopting the above technical solution, it is easy to quickly pick up and put down the cylinder head under test, reducing the testing operation time.
[0022] Optionally, the drain basket is provided with a drain basket lifting ring for easy loading and unloading.
[0023] By adopting the above technical solutions, various hoisting equipment can be adapted, reducing the difficulty of manual handling and improving operational convenience.
[0024] Optionally, a lift is also included, which is connected to the drain basket lifting ring via a chain for picking up and putting down the drain basket.
[0025] By adopting the above technical solutions, labor costs can be reduced and testing efficiency can be improved.
[0026] Optionally, the water tank is provided with a water tank lifting ring, which is used to connect with the hanging chain to move the water tank.
[0027] By adopting the above technical solution, it is easy to quickly move the water tank using various hoisting equipment, thereby improving the flexibility and applicability of the device.
[0028] Optionally, a sealing gasket is provided between the base plate and the cylinder head under test.
[0029] By adopting the above technical solution, the air outlet of the water channel in the cylinder head under test is sealed, thus avoiding gas leakage during the test process from interfering with the test results.
[0030] In summary, this application includes at least one of the following beneficial technical effects:
[0031] 1. Accurately determine the leakage location of the cylinder head under test and simulate the working temperature of the cylinder head under test to avoid detection errors caused by thermal expansion and contraction;
[0032] 2. Monitor the temperature of the testing water in real time to ensure that the cylinder head under test is in the required temperature environment for testing;
[0033] 3. Dynamically adjust the heating power to reduce the interference of temperature fluctuations on the sealing performance test of the cylinder head under test;
[0034] 4. The test water is heated evenly to avoid local temperature differences and ensure that the cylinder head under test is heated evenly to simulate the real temperature distribution; the redundant design (if a single heating unit fails, the other multiple heating units can still work) improves the reliability and fault tolerance of the device. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the cylinder head sealing performance testing device according to Embodiment 1 of this application;
[0036] Figure 2 This is a perspective structural diagram of the cylinder head sealing performance testing device during testing according to Embodiment 1 of this application;
[0037] Figure 3 yes Figure 2 Schematic diagram of the structure of the heating rod;
[0038] Figure 4 yes Figure 2 Enlarged view of area A in the middle;
[0039] Figure 5This is a perspective structural diagram of the cylinder head sealing performance testing device during testing according to Embodiment 2 of this application.
[0040] Explanation of reference numerals in the attached drawings: 10, water tank; 11, first water tank lifting ring; 12, second water tank lifting ring; 13, opening; 20, heating device; 21, heating rod; 22, heating unit; 23, sealing ring; 30, drain basket; 31, first drain basket lifting ring; 32, second drain basket lifting ring; 40, hanging chain; 50, lifting platform; 60, control box; 61, temperature sensor; 70, air source; 71, air pipe; 80, cylinder head; 81, base plate; 82, sealing gasket. Detailed Implementation
[0041] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.
[0042] This application discloses a cylinder head sealing performance testing device.
[0043] Example 1
[0044] Reference Figure 1 and Figure 2 The cylinder head sealing test device includes a water tank 10, a heating device 20, a drain basket 30, a hanging chain 40, a lifting platform 50, a control box 60, and an air source 70. The heating device 20 is located inside the water tank 10. During testing, the drain basket 30 is located inside the water tank 10 to accommodate the cylinder head 80 under test. The hanging chain 40 is attached to the drain basket 30, and the lifting platform 50 is connected to the hanging chain 40. The control box 60 is fixed to the water tank 10, and the air source 70 is connected to the air inlet of the water channel of the cylinder head 80 under test via an air pipe 71.
[0045] The water tank 10 contains test water for detecting the airtightness of the water passages in the cylinder head 80 under test. The test water covers the cylinder head 80 under test. The water tank 10 has a first water tank lifting ring 11 and a second water tank lifting ring 12 for easy movement of the water tank 10. An opening 13 is provided on the outer wall of the water tank 10 for mounting the heating device 20. The control box 60 is electrically connected to the heating device 20 for controlling the power of the heating device 20. The control box 60 is electrically connected to a temperature sensor 61, which is placed in the water tank 10 to read the temperature of the test water.
[0046] The drain basket 30 has a first drain basket lifting ring 31 and a second drain basket lifting ring 32, the first drain basket lifting ring 31 and the second drain basket lifting ring 32 are respectively hooked to the hanging chain 40, and the hanging chain 40 is connected to the elevator 50.
[0047] Reference Figure 2 and Figure 3 The heating device 20 can be a heating rod 21, which extends into the water tank 10 through the opening 13, and a sealing ring 23 is provided between the heating rod 21 and the opening 13.
[0048] Reference Figure 4 A base plate 81 is connected to the air outlet of the water channel of the cylinder head 80 under test, and a sealing gasket 82 is provided between the cylinder head 80 under test and the base plate 81.
[0049] The implementation principle of Example 1 is as follows:
[0050] The base plate 81 is connected to the air outlet of the water channel of the cylinder head 80 under test, the air pipe 71 is connected to the air inlet of the water channel of the cylinder head 80 under test, the cylinder head 80 under test is placed in the test water, and the sealing performance and leakage location of the cylinder head 80 under test can be determined based on the appearance and position of the bubbles in the test water.
[0051] The control box 60 dynamically adjusts the power of the heating rod 21 based on the real-time feedback data from the temperature sensor 61, so that the temperature of the test water is stabilized at around 80°C, simulating the operating temperature of the cylinder head 80 under test, and avoiding test errors due to thermal expansion and contraction.
[0052] Example 2
[0053] Reference Figure 5 The difference between this embodiment and embodiment 1 is that the heating device 20 consists of multiple heating units 22, which are evenly arranged on the inner wall of the water tank 10. The control box 60 independently adjusts the heating power of each heating unit 22 to achieve a uniform distribution of the temperature of the test water.
[0054] The implementation principle of Example 2 is as follows:
[0055] By evenly distributing multiple heating units 22 on the inner wall of the water tank 10, the test water can be heated more evenly compared to Embodiment 1, avoiding temperature differences in different directions of the cylinder head 80 under test, thereby making the simulated temperature distribution more consistent with the actual operating environment of the cylinder head 80 under test.
[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A cylinder head sealing performance testing device, characterized in that, include: A water tank (10) is used to hold the cylinder head (80) to be tested. When testing, the water tank (10) is filled with test water that covers the cylinder head (80) to be tested. A heating device (20) is provided in the water tank (10) for heating the test water in the water tank (10) during the test to simulate the working temperature of the cylinder head (80) under test; An air source (70) is connected to the air inlet of the water channel of the cylinder head (80) under test through an air pipe (71), and a base plate (81) is provided on the air outlet of the water channel of the cylinder head (80) under test. The air source (70) is used to circulate air into the water channel of the cylinder head (80) under test to detect the sealing performance of the cylinder head (80) under test.
2. The cylinder head sealing performance testing device according to claim 1, characterized in that, It also includes a control box (60) and a temperature sensor (61) electrically connected to the control box (60). The control box (60) is fixed on the outer wall of the water tank (10). The temperature sensor (61) is placed inside the water tank (10) to read the temperature of the detection water in the water tank (10).
3. The cylinder head sealing performance testing device according to claim 2, characterized in that, The control box (60) is electrically connected to the heating device (20) for controlling the power of the heating device (20).
4. The cylinder head sealing performance testing device according to claim 3, characterized in that, The heating device (20) is a heating rod (21). The outer wall of the water tank (10) is provided with an opening (13). The heating rod (21) extends into the water tank (10) through the opening (13) and is fixed on the outer wall of the water tank (10). A sealing ring (23) is provided between the heating rod (21) and the opening (13).
5. The cylinder head sealing performance testing device according to claim 3, characterized in that, The heating device (20) includes multiple heating units (22), which are evenly distributed on the inner wall of the water tank (10).
6. The cylinder head sealing performance testing device according to claim 1, characterized in that, It also includes a drain basket (30) for accommodating the cylinder head (80) under test, which is located in the water tank (10) during testing.
7. The cylinder head sealing performance testing device according to claim 6, characterized in that, The drain basket (30) is provided with a drain basket lifting ring (31, 32) for easy access to the drain basket (30).
8. The cylinder head sealing performance testing device according to claim 7, characterized in that, It also includes a lift (50), which is connected to the drain basket lifting ring (31, 32) via a hanging chain (40) for picking up and putting down the drain basket (30).
9. The cylinder head sealing performance testing device according to claim 8, characterized in that, The water tank (10) is provided with a water tank lifting ring (11, 12), which is used to connect with the hanging chain (40) to move the water tank (10).
10. The cylinder head sealing performance testing device according to claim 1, characterized in that, A sealing gasket (82) is provided between the cylinder head (80) under test and the base plate (81).