Engine cylinder head air tightness tester

Abstract

The utility model relates to cylinder cover test technical field, concretely is a kind of engine cylinder cover air tightness tester: including base plate, the surface of base plate is fixedly connected with positioning screw rod, the surface of positioning screw rod is sleeved with sealing gasket, the surface of positioning screw rod is sleeved with cylinder cover body, the surface of positioning screw rod is threadedly connected with lock nut, one side of sealing gasket is provided with gas pipe connecting port.The utility model is fixed with positioning screw rod on base plate, screw rod is sequentially sleeved with sealing gasket, cylinder cover body, and is locked with lock nut, gas pipe connecting port inserts gas pipe joint, there is sealing ring on joint, gas pipe joint connects gas pipe and air gun, when detecting, cylinder cover body is placed into water, air gun gas, if bottom bubble, air tightness drops, no reaction is good, it is simple to operate, need not professional skill, and tool cost is low.

Description

Technical Field

[0001] This utility model relates to the field of cylinder head testing technology, specifically to an engine cylinder head airtightness tester. Background Technology

[0002] As one of the key components of an engine, the airtightness of the cylinder head is crucial to the engine's performance and lifespan. During engine use, the cylinder head may develop cracks or seal failure due to factors such as high temperature, high pressure, and mechanical stress, leading to a decrease in airtightness. This not only affects engine performance but may also cause engine damage and increase maintenance costs.

[0003] Currently, the main methods for testing the air tightness of cylinder heads include pressure testing and leakage testing. Pressure testing usually involves filling the cylinder head with air and then measuring the pressure difference between the inside and outside of the cylinder head to determine air tightness. Leakage testing involves applying pressure inside the cylinder head and then detecting whether there is gas leakage to determine air tightness. However, these methods often require specialized equipment and personnel to operate, and the testing process is relatively complex and costly. Therefore, an engine cylinder head air tightness tester was designed. Utility Model Content

[0004] The purpose of this utility model is to provide an engine cylinder head air tightness tester to solve the problems mentioned in the background art, such as the need for professional equipment and personnel to operate the engine cylinder head air tightness tester, and the relatively complex and costly testing process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an engine cylinder head airtightness tester includes a base plate, a positioning screw fixedly connected to the surface of the base plate, a sealing gasket sleeved on the surface of the positioning screw, a cylinder head body sleeved on the surface of the positioning screw, a locking nut threadedly connected to the surface of the positioning screw, a vent pipe connection port provided on one side of the sealing gasket, an air pipe connector inserted into the vent pipe connection port, a sealing ring sleeved on the air pipe connector, an air supply pipe fixedly connected to the surface of the air pipe connector, an air gun fixedly connected to one end of the air supply pipe, an air intake pipe fixedly connected to the input end of the air gun, a positioning frame fixedly connected to one side of the air pipe connector, and bolts threadedly connected to the surface of the positioning frame.

[0006] Preferably, the substrate and the sealing gasket are the same size, and both the substrate and the sealing gasket have circular holes on their surfaces. The sealing gasket has guide holes on its surface, and the sealing gasket is fitted onto the surface of the positioning screw through the guide holes.

[0007] Preferably, the sealing gasket is in contact with the surface of the substrate, and the cylinder head body presses the sealing gasket against the surface of the substrate.

[0008] Preferably, four sets of positioning screws and locking nuts are provided, and the locking nuts lock the cylinder head body onto the surface of the base plate on the positioning screws.

[0009] Preferably, the positioning frame is U-shaped and is snapped onto one side of the cylinder head body.

[0010] Preferably, the positioning frame has a threaded hole at the end away from the air pipe connector. The bolt is pressed against one side of the cylinder head body through the threaded hole of the positioning frame. The bolt, through compression, causes the positioning frame to press the sealing ring onto the surface of the cylinder head body through the air pipe connector.

[0011] Preferably, the air gun supplies air into the air delivery pipe through the air inlet pipe, and the air delivery pipe supplies air into the air outlet pipe through the air pipe connector.

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

[0013] 1. This airtightness tester uses a positioning screw and locking nut to achieve sealed positioning of the cylinder head body on the base plate. The positioning frame and bolts complete the connection and sealing of the air pipe connector and vent pipe connection. No complicated steps or professional skills are required; ordinary personnel can easily operate it. In terms of cost, the base plate, air gun, and air pipe connector used are common and inexpensive, greatly reducing testing costs. Regarding accuracy, the sealing gasket and sealing ring seal the cylinder head body to the base plate and the air pipe connector to the vent pipe connection, creating a stable environment for testing, avoiding external interference, and ensuring reliable test results. By immersing the cylinder head body in water and judging whether bubbles appear, the airtightness is determined intuitively and quickly and accurately. With its convenient operation, low cost, and accurate test results, this tester provides an efficient and economical solution for engine cylinder head airtightness testing. Attached Figure Description

[0014] Figure 1 This is a three-dimensional front view of the structure of this utility model;

[0015] Figure 2 This is a side-view perspective view of the structure of this utility model;

[0016] Figure 3 This is a three-dimensional exploded view of the structure of this utility model from the rear view and cross-section.

[0017] Figure 4 This is a partial three-dimensional exploded view of the structure of this utility model from the front and bottom views;

[0018] Figure 5 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0019] In the diagram: 1. Base plate; 11. Sealing gasket; 12. Cylinder head body; 13. Positioning screw; 14. Locking nut; 15. Air vent pipe connection port; 2. Air pipe connector; 21. Sealing ring; 22. Air supply pipe; 23. Air gun; 24. Air inlet pipe; 25. Positioning frame; 26. Bolt. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-5 One embodiment provided by this utility model:

[0022] An engine cylinder head airtightness tester includes a base plate 1. A positioning screw 13 is fixedly connected to the surface of the base plate 1. A sealing gasket 11 is fitted onto the surface of the positioning screw 13. A cylinder head body 12 is fitted onto the surface of the positioning screw 13. A locking nut 14 is threaded onto the surface of the positioning screw 13. A vent pipe connection port 15 is provided on one side of the sealing gasket 11. An air pipe connector 2 is inserted into the vent pipe connection port 15. A sealing ring 21 is fitted onto the air pipe connector 2. An air supply pipe 22 is fixedly connected to the surface of the air pipe connector 2. An air gun 23 is fixedly connected to one end of the air supply pipe 22. An air intake pipe 24 is fixedly connected to the input end of the air gun 23. A positioning frame 25 is fixedly connected to one side of the connector 2. Bolts 26 are threaded onto the surface of the positioning frame 25. During the testing process, the cylinder head body 12 needs to be sealed and positioned on the base plate 1. After the cylinder head body 12 is placed in water, gas is introduced into the vent pipe connection port 15 through the air gun 23. When bubbles appear at the bottom of the cylinder head body 12 in the water, it indicates that the air tightness has decreased. When there is no reaction at the bottom of the cylinder head body 12 in the water, it proves that the cylinder head body 12 has good sealing performance. The whole testing process is simple, requires professional equipment and personnel to operate, and the cost of the tools used is low, thereby reducing the cost of testing.

[0023] Furthermore, the substrate 1 and the sealing gasket 11 are the same size, and both the substrate 1 and the sealing gasket 11 have circular holes on their surfaces. The sealing gasket 11 has guide holes on its surface. The sealing gasket 11 is fitted onto the surface of the positioning screw 13 through the guide holes. The circular holes in the substrate 1 and the sealing gasket 11 are reserved for gas detection. The gas from the cylinder head body 12 will form bubbles in the water through the circular holes in the substrate 1 and the cylinder head body 12. The circular holes on the surfaces of the substrate 1 and the sealing gasket 11 have specific size and position requirements. The diameter of the circular holes needs to be designed according to the exhaust channel size of the cylinder head body 12 to ensure that the gas can pass through smoothly. Its position should correspond to the exhaust port of the cylinder head body 12 so that the gas leaking from the cylinder head body 12 can accurately enter the water through the circular holes to form bubbles. At the same time, the edges of the circular holes should be smoothed to avoid affecting the flow of gas and the formation of bubbles due to rough edges.

[0024] Furthermore, the sealing gasket 11 is connected to the surface of the substrate 1, and the cylinder head body 12 presses the sealing gasket 11 on the surface of the substrate 1. The sealing gasket 11 forms a seal between the substrate 1 and the cylinder head body 12, establishing a relatively stable testing environment for the cylinder head body 12, so that the testing process is not affected by external factors.

[0025] Furthermore, four sets of positioning screws 13 and locking nuts 14 are provided. The locking nuts 14 lock the cylinder head body 12 onto the surface of the base plate 1 on the positioning screws 13. At this time, the four sets of locking nuts 14, together with the four sets of positioning screws 13, restrict the cylinder head body 12 onto the surface of the base plate 1, thereby completing the sealing and positioning of the cylinder head body 12 on the base plate 1.

[0026] Furthermore, the positioning frame 25 is U-shaped and is snapped onto one side of the cylinder head body 12. The air pipe connector 2 is inserted into the bleed pipe connection port 15 through the positioning frame 25. After the bleed pipe connection port 15 is on one side of the cylinder head body 12, the bolt 26 is threaded onto the intake pipe 24. At this time, the position of the positioning frame 25 on the cylinder head body 12 can limit the position of the air pipe connector 2 on the locking nut 14.

[0027] Furthermore, the positioning frame 25 has a threaded hole at the end away from the air pipe connector 2. The bolt 26 is pressed against one side of the cylinder head body 12 through the threaded hole of the positioning frame 25. The bolt 26, through pressing, causes the positioning frame 25 to press the sealing ring 21 onto the surface of the cylinder head body 12 through the air pipe connector 2. After pressing against the cylinder head body 12, the bolt 26 continues to rotate, causing the positioning frame 25 to move the air pipe connector 2, so that the air pipe connector 2 is inserted into the bleed pipe connection port 15, and the air pipe connector 2 presses the sealing ring 21 onto the surface of the cylinder head body 12, sealing the connection between the air pipe connector 2 and the bleed pipe connection port 15, ensuring the quality of the cylinder head body 12 inspection. The sealing ring 21 is usually made of materials with good elasticity and sealing performance, such as rubber. Its inner diameter should be slightly smaller than the outer diameter of the air pipe connector 2, and its outer diameter should be slightly larger than the inner diameter of the bleed pipe connection port 15, to ensure that an effective seal can be formed during the pressing process.

[0028] Furthermore, when the air gun 23 supplies air to the air supply pipe 22 through the air intake pipe 24, and when the air gun 23 supplies air to the vent pipe connection port 15, the pressure and flow rate of the supplied air need to be carefully controlled. The supply pressure should be set according to the design requirements of the cylinder head body 12 and the actual testing standards. Generally, it should be within a suitable range to ensure that minor leaks can be detected without damaging the cylinder head body 12 due to excessive pressure. The air supply pipe 22 supplies air to the vent pipe connection port 15 through the air pipe connector 2. The vent pipe connection port 15 introduces the processing gas into the cylinder head body 12. When the cylinder head body 12 is placed in water, if there is an internal leak, air bubbles will appear in the water, thus detecting the airtightness of the cylinder head body 12.

[0029] Working principle: The sealing gasket 11 is fitted onto the positioning screw 13, making it contact the surface of the base plate 1. The cylinder head body 12 is then fitted onto the surface of the positioning screw 13. A locking nut 14 is threaded onto the positioning screw 13, locking the cylinder head body 12 onto the base plate 1 in conjunction with the positioning screw 13. The positioning screw 13 presses the sealing gasket 11 against the surface of the base plate 1 to form a seal. The positioning frame 25 is then placed on one side of the cylinder head body 12, aligning the air supply pipe 22 with the vent pipe connection port 15. A bolt 26 is rotated at one end of the positioning frame 25 to make it contact the surface of the cylinder head body 12. Rotating the bolt 26 further causes the positioning frame 25 to slide the air pipe connector 2 into the vent pipe connection port 15. On the air pipe connection port 15, and the air pipe connector 2 presses the sealing ring 21 onto the surface of the cylinder head body 12, forming a seal on the air pipe connection port 15 and the air pipe connector 2. At this time, the cylinder head body 12 is placed in water, and the air gun 23 passes through the air pipe 24 to deliver gas into the air supply pipe 22. The air supply pipe 22 delivers gas into the cylinder head body 12 through the air pipe connector 2. The bottom of the cylinder head body 12 is located at the circular hole of the base plate 1 and the sealing gasket 11. If bubbles appear, it indicates that the air tightness of the cylinder head body 12 has decreased. If there is no reaction at the bottom of the cylinder head body 12 located at the circular hole of the base plate 1 and the sealing gasket 11, it indicates that the air tightness of the cylinder head body 12 is good. The whole testing process is simple, requires professional equipment and personnel to operate, and the cost of the tools used is low, thereby reducing the cost of testing.

[0030] 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 engine cylinder head airtightness tester, characterized in that: The system includes a base plate (1), on which a positioning screw (13) is fixedly connected, a sealing gasket (11) is fitted on the surface of the positioning screw (13), a cylinder head body (12) is fitted on the surface of the positioning screw (13), a locking nut (14) is threadedly connected to the surface of the positioning screw (13), a vent pipe connection port (15) is provided on one side of the sealing gasket (11), an air pipe connector (2) is inserted into the vent pipe connection port (15), a sealing ring (21) is fitted on the air pipe connector (2), an air supply pipe (22) is fixedly connected to the surface of the air pipe connector (2), an air gun (23) is fixedly connected to one end of the air supply pipe (22), an air inlet pipe (24) is fixedly connected to the input end of the air gun (23), a positioning frame (25) is fixedly connected to one side of the air pipe connector (2), and a bolt (26) is threadedly connected to the surface of the positioning frame (25).

2. The engine cylinder head airtightness tester according to claim 1, characterized in that: The substrate (1) and the sealing gasket (11) are the same size, and both the substrate (1) and the sealing gasket (11) have circular holes on their surfaces. The sealing gasket (11) has guide holes on its surface, and the sealing gasket (11) is sleeved on the surface of the positioning screw (13) through the guide holes.

3. The engine cylinder head airtightness tester according to claim 1, characterized in that: The sealing gasket (11) is in contact with the surface of the substrate (1), and the cylinder head body (12) presses the sealing gasket (11) on the surface of the substrate (1).

4. The engine cylinder head airtightness tester according to claim 3, characterized in that: The positioning screw (13) and locking nut (14) are provided in four sets. The locking nut (14) locks the cylinder head body (12) onto the surface of the base plate (1) on the positioning screw (13).

5. The engine cylinder head airtightness tester according to claim 1, characterized in that: The positioning frame (25) is U-shaped and is snapped onto one side of the cylinder head body (12).

6. The engine cylinder head airtightness tester according to claim 1, characterized in that: The positioning frame (25) has a threaded hole at one end away from the air pipe connector (2). The bolt (26) is pressed against one side of the cylinder head body (12) through the threaded hole of the positioning frame (25). The bolt (26) causes the positioning frame (25) to press the sealing ring (21) against the surface of the cylinder head body (12) through the air pipe connector (2).

7. The engine cylinder head airtightness tester according to claim 1, characterized in that: The air gun (23) supplies air into the air supply pipe (22) through the air inlet pipe (24), and the air supply pipe (22) supplies air into the air outlet pipe (15) through the air pipe connector (2).

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