Water passage coupling structure for engine

Abstract

The utility model relates to water route structure technical field, and disclose a water route connecting structure for engine is suitable for the pipeline connection between EGR cooler and temperature regulator seat of high horse power natural gas engine, and provides cooling liquid flow passage, specifically includes first water pipe joint, second water pipe joint, connecting pipe, and the opening end of first water pipe joint and second water pipe joint all has the seat hole of centering arrangement, and the both ends of connecting pipe are connected with first water pipe joint and second water pipe joint respectively through seat hole. The utility model discloses through the interference fit of annular protrusion of sealing sleeve both ends and seat hole inner wall, and then through the hard contact occlusion of seat hole inner wall after the thermal expansion of steel pipe lining temperature, improves the stability of connection, and also can make up the elastic attenuation caused by sealing sleeve aging, thereby realizes double seal, prevents cooling liquid leakage, effectively improves the sealing property of engine water route connection, and convenient to dismount, is convenient for the overhauling and maintenance of later period.

Description

Technical Field

[0001] This utility model relates to the field of waterway structure technology, specifically a waterway connection structure for an engine. Background Technology

[0002] Engine water hose connection technology is a core aspect of automotive cooling system design, involving challenges in areas such as sealing, pressure resistance, heat dissipation efficiency, and connection reliability. Existing engine water hose connection technologies have the following shortcomings:

[0003] 1. Risk of seal failure: Traditional water pipe connections often use simple rubber sealing rings, which are prone to deformation or aging and leakage due to long-term exposure to coolant pressure, high temperature and chemical corrosion, requiring frequent maintenance;

[0004] 2. Insufficient structural strength: Cast iron or pure rubber hoses are prone to detaching from the joint due to the impact of coolant under high torque conditions, especially in turbocharged engines, where the high temperature and high pressure environment will exacerbate the fatigue of the connectors.

[0005] 3. Difficult to disassemble and maintain: Traditional flange connections use ordinary bolts for fastening. After long-term use, the nuts and bolts are prone to rust and jamming. Disassembly requires violent damage to the parts, increasing maintenance costs.

[0006] To address the problems in the prior art, this application proposes a water connection structure for an engine. Utility Model Content

[0007] To address the technical problems existing in the background art, this utility model proposes a water circuit connection structure for an engine.

[0008] This utility model proposes a water circuit connection structure for an engine, which is suitable for the pipeline connection between the EGR cooler and thermostat seat of a high-horsepower natural gas engine and provides a coolant flow channel. Specifically, it includes a first water pipe joint, a second water pipe joint, and a connecting pipe. The open ends of the first water pipe joint and the second water pipe joint are both provided with centered seat holes. The two ends of the connecting pipe are connected to the first water pipe joint and the second water pipe joint respectively through the seat holes.

[0009] The connecting pipe includes a steel pipe liner, with both ends of the steel pipe liner being inserted into adjacent seat holes respectively. A sealing sleeve is fitted on the outside of the steel pipe liner, and the sealing sleeve forms annular protrusions on the outer periphery of both ends of the steel pipe liner. The annular protrusions are interference-fitted with the inner wall of the adjacent seat hole to form a radial seal.

[0010] As a further optimization of this utility model, a limiting block is installed on the outer wall of the connecting pipe. The limiting block is located between the first water pipe joint and the second water pipe joint, and the two ends of the limiting block are respectively attached to the end faces of the first water pipe joint and the second water pipe joint.

[0011] The limiting block is made of Q235 steel plate and is fixed to the outer wall of the connecting pipe by welding. It restricts the axial displacement of the connecting pipe. Under the high torque condition of the engine, the limiting block can prevent the connecting pipe from falling out of the seat hole. Together with the radial seal of the sealing sleeve, it forms a two-way constraint and improves the reliability of the connection.

[0012] As a further optimization of this utility model, the number of limiting blocks is at least two, and the at least two limiting blocks are evenly distributed along the circumference of the connecting pipe.

[0013] The circumferentially distributed limiting blocks can balance the circumferential torque on the connecting pipe, avoid local wear of the sealing sleeve caused by uneven torque, and thus extend the service life of the sealing sleeve.

[0014] As a further optimization of this utility model, there are gaps between the two ends of the connecting tube and the inner wall end faces of the adjacent seat holes;

[0015] Axial clearance prevents the end of the connecting pipe from contacting the end face of the seat hole, thus ensuring proper installation and avoiding seal failure caused by installation tilt.

[0016] As a further optimization of this utility model, both ends of the sealing sleeve have an extension that extends to the outer side of the end of the steel pipe lining.

[0017] The extension is exposed on the end face of the steel pipe liner, which makes it easy to visually inspect the aging of the sealing sleeve, such as cracks and deformation. When the extension shows obvious hardening or cracking, the sealing sleeve can be replaced in time without disassembling the steel pipe liner, thus reducing maintenance costs.

[0018] As a further optimization of this utility model, the sealing sleeve is a vulcanized rubber sleeve, and the compression rate of the vulcanized rubber is 75%;

[0019] The 75% compression ratio allows the sealing sleeve to maintain high elastic deformation after installation, generating a continuous radial clamping force, so that the sealing sleeve can still maintain an effective seal even under long-term high-temperature conditions.

[0020] As a further optimization of this utility model, the inner lining of the steel pipe is a seamless steel pipe, and the inner lining of the steel pipe undergoes thermal expansion at high temperature to form a hard contact engagement with the inner wall of the seat hole.

[0021] The thermal expansion coefficient of the seamless steel pipe is matched with the seat hole. When the temperature rises, the inner lining of the steel pipe expands radially and forms an interference fit with the inner wall of the seat hole, which enhances the connection rigidity. At the same time, the auxiliary sealing sleeve forms a double seal to prevent coolant leakage.

[0022] As a further optimization of this utility model, when the two ends of the connecting tube are pressed into the adjacent seat holes, the annular protrusion undergoes elastic deformation to generate surface pressure to compensate for the tiny gaps between the joint parts.

[0023] The elastic deformation of the annular protrusion can automatically compensate for the machining tolerances of the seat hole and the connecting pipe. Even if there are small gaps in the interface, the surface pressure of the annular protrusion can ensure a seal, avoiding leakage problems caused by uneven bolt tightening in traditional flange connections.

[0024] The water connection structure for an engine proposed in this utility model has the following beneficial effects:

[0025] (i) By interfering with the inner wall of the seat hole through the annular protrusions at both ends of the sealing sleeve, the vulcanized rubber of the sealing sleeve has a compression rate of 75%, which can form a high initial sealing surface pressure, thereby improving the resistance to cooling hydraulic pressure. After the steel pipe lining expands under the temperature, it forms a hard contact engagement with the inner wall of the seat hole, which improves the connection stability and can also compensate for the elastic decay caused by the aging of the sealing sleeve, thereby achieving double sealing, preventing coolant leakage, effectively improving the sealing performance of the engine water circuit connection, and is easy to disassemble and install, which is convenient for later inspection and maintenance.

[0026] (ii) The steel pipe lining provides rigid support, which can withstand the large torque generated by coolant impact and engine vibration. The vulcanized rubber material of the sealing sleeve can absorb high-frequency vibration, avoid fatigue fracture caused by direct friction between metal parts. The limiting blocks are evenly distributed along the circumference of the connecting pipe, restricting the axial displacement of the connecting pipe, preventing the interface from disengaging under high torque conditions, and helping to improve the fatigue life of the connecting pipe.

[0027] (iii) The end of the connecting pipe is pressed into the seat hole, and the elastic deformation of the annular protrusion automatically compensates for the interface tolerance. No bolt fastening is required. During disassembly, only a special tool is needed to push it out. The disassembly and assembly time of a single interface is significantly shortened compared with the traditional flange connection. Moreover, the extension of the sealing sleeve is exposed on the interface end face, and its aging degree can be visually inspected. During maintenance, only the sealing sleeve needs to be replaced while the steel pipe lining is retained, thereby reducing maintenance costs.

[0028] (iv) The sealing sleeve adopts the fluororubber vulcanization process, which is resistant to the corrosion of ethylene glycol in the coolant and can still maintain elasticity at a high temperature of 150℃. The inner surface of the steel pipe is galvanized, which is suitable for the high temperature and high pressure environment of high horsepower natural gas engines, which helps to extend the failure interval of the cooling system and eliminates the need for frequent maintenance.

[0029] (v) The structural components of this application adopt a standardized design. The steel pipe lining and sealing sleeve can be quickly switched according to the pipe diameter to match the corresponding water pipe interface. Compared with the traditional flange connection, it reduces material costs and does not require welding or special processing. It is suitable for mass production, can effectively control production costs, and improve enterprise production efficiency.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a schematic diagram of a half-section of the present invention;

[0033] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the present invention.

[0034] Figure 4 This is a front view cross-sectional structural diagram of the connecting pipe of this utility model.

[0035] Figure descriptions: 1. First water pipe joint; 2. Second water pipe joint; 3. Connecting pipe; 31. Steel pipe lining; 32. Sealing sleeve; 33. Annular protrusion; 4. Limiting block; 5. Seat hole. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the cooling system of a high-horsepower natural gas engine, the sealing and reliability of the water circuit connection are crucial. Traditional connection methods suffer from problems such as easy seal failure, insufficient structural strength, and difficulty in disassembly and maintenance. The water circuit connection structure of this utility model effectively solves these problems through innovative design, and its specific implementation is as follows:

[0039] like Figure 1 and Figure 2 As shown, the water connection structure mainly consists of a first water pipe joint 1, a second water pipe joint 2, and a connecting pipe 3. The open ends of the first water pipe joint 1 and the second water pipe joint 2 are provided with centered seat holes 5. The two ends of the connecting pipe 3 are connected to the two joints through the seat holes 5.

[0040] like Figures 2-4 As shown, the connecting pipe 3 includes a steel pipe liner 31 and a sealing sleeve 32. The steel pipe liner 31 is a seamless steel pipe, and its two ends are respectively inserted into adjacent seat holes 5. The sealing sleeve 32 is fitted on the outside of the steel pipe liner 31. Annular protrusions 33 are formed on the outer periphery of both ends of the steel pipe liner 31. The annular protrusions 33 are interference-fitted with the inner wall of the seat hole 5, thereby forming a radial seal. The two ends of the sealing sleeve 32 have extensions extending to the outer side of the end of the steel pipe liner 31. The height of the extensions is 1.5mm, which facilitates visual inspection of the aging condition of the sealing sleeve 32.

[0041] like Figure 1 , Figure 3 and Figure 4 As shown, a limiting block 4 is installed on the outer wall of the connecting pipe 3. The limiting block 4 is located between the first water pipe joint 1 and the second water pipe joint 2, and its two ends are respectively in contact with the end faces of the two joints. There are at least two limiting blocks 4, which are evenly distributed along the circumference of the connecting pipe 3 to balance the circumferential torque and limit the axial displacement of the connecting pipe 3. There is a 1mm gap between the two ends of the connecting pipe 3 and the inner wall end face of the adjacent seat hole 5 to prevent the end of the connecting pipe 3 from contacting the end face of the seat hole and to ensure installation fit.

[0042] When both ends of the connecting pipe 3 are pressed into the seat hole 5, the annular protrusion 33 of the sealing sleeve 32 undergoes elastic deformation, generating surface pressure to compensate for the small gap between the joint parts. The sealing sleeve 32 is a vulcanized rubber sleeve with a compression rate of 75%. After installation, it maintains high elastic deformation and can generate continuous radial clamping force to ensure the initial sealing effect.

[0043] The steel pipe liner 31 will expand thermally at high temperature, forming a hard contact engagement with the inner wall of the seat hole 5, enhancing the connection rigidity and assisting the sealing sleeve 32 to form a double seal. This double sealing mechanism can effectively prevent coolant leakage. Even if the sealing sleeve 32 ages due to long-term use, the thermal expansion of the steel pipe liner 31 can compensate for the decrease in elasticity of the sealing sleeve 32 to a certain extent, maintaining the sealing performance of the connection.

[0044] During engine operation, the pressure of the coolant and the vibration of the engine will affect the water circuit connection. The limiting block 4 is evenly distributed in the circumference, which can balance the circumferential torque on the connecting pipe 3 and prevent the connecting pipe 3 from detaching from the seat hole 5. The steel pipe liner 31 provides rigid support and can withstand the large torque generated by the impact of coolant and engine vibration. The vulcanized rubber material of the sealing sleeve 32 can absorb high-frequency vibration, avoid fatigue fracture caused by direct friction between metal parts, and improve the fatigue life of the connecting pipe 3.

[0045] In one embodiment, such as Figure 3 and Figure 4 As shown, the inner lining of the steel pipe 31 is made of 304 stainless steel, which can prevent water and rust. The inner diameter D1=57mm and the outer diameter D2=60mm.

[0046] The vulcanized rubber of sealing sleeve 32 requires a hardness of 50-55HA, a compression set of ≤25% (JB / T7757), a temperature range of -40 to 150℃, and an outer diameter D3 of 33 of 69±0.1mm.

[0047] The limiting block 4 is integrated with the inner lining of the steel pipe 31, with D4=77mm, L1=15mm, L2=19mm, and L3=1.5mm. The limiting block 4 restricts the relative position of the sealing sleeve 32 and the inner lining of the steel pipe 31, so that the gap between the end face of the connecting pipe 3 and the inner wall end face of the adjacent seat hole 5 is L4=1mm.

[0048] In summary, this water circuit connection structure effectively improves the resistance to cooling hydraulic pressure and prevents leakage through its double sealing mechanism, making it suitable for the high-temperature and high-pressure environment of high-horsepower natural gas engines. The sealing sleeve 32 is made of fluororubber vulcanization process, which is resistant to ethylene glycol corrosion in the coolant and can maintain elasticity at a high temperature of 150℃, extending the failure interval of the cooling system and reducing the maintenance frequency.

[0049] In terms of structural strength and reliability, the design of the steel pipe liner 31 and the limiting block 4 enhances the stability of the connection, can withstand greater torque and vibration, avoids interface separation, and improves the fatigue life of the connecting pipe 3.

[0050] In terms of disassembly and maintenance, the structure does not require bolt fastening. Disassembly only requires a special tool to push it out. The disassembly and assembly time of a single interface is significantly shortened compared to traditional flange connections. During maintenance, only the sealing sleeve 32 needs to be replaced, while the steel pipe liner 31 is retained, which reduces maintenance costs.

[0051] In addition, the structural components adopt a standardized design, and the steel pipe liner 31 and sealing sleeve 32 can be quickly switched according to the pipe diameter to adapt to different specifications of water pipe interfaces, which reduces material costs, is suitable for mass production, can effectively control production costs, and improve enterprise production efficiency.

[0052] In practical applications, this water-cooled connection structure can be widely used in the cooling systems of high-horsepower natural gas engines to ensure the stable operation of the cooling system during engine operation, thereby improving the engine's reliability and service life. For example, this structure was used in the cooling system of a high-horsepower natural gas engine. After long-term operation testing, no coolant leakage was observed. The connection is reliable, maintenance is convenient, and the engine's operating requirements are met.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A water connection structure for an engine, comprising a first water pipe connector (1), a second water pipe connector (2), and a connecting pipe (3), wherein the open ends of the first water pipe connector (1) and the second water pipe connector (2) each have a centrally located seat hole (5), and both ends of the connecting pipe (3) are connected to the first water pipe connector (1) and the second water pipe connector (2) respectively through the seat holes (5), characterized in that, The connecting pipe (3) includes a steel pipe liner (31), the two ends of which are respectively inserted into the adjacent seat holes (5). The outer side of the steel pipe liner (31) is fitted with a sealing sleeve (32), and the sealing sleeve (32) forms an annular protrusion (33) on the outer periphery of both ends of the steel pipe liner (31). The annular protrusion (33) is interference-fitted with the inner wall of the adjacent seat hole (5) to form a radial seal.

2. The water connection structure for an engine according to claim 1, characterized in that, A limiting block (4) is installed on the outer wall of the connecting pipe (3). The limiting block (4) is located between the first water pipe joint (1) and the second water pipe joint (2), and the two ends of the limiting block (4) are respectively attached to the end faces of the first water pipe joint (1) and the second water pipe joint (2).

3. The water connection structure for an engine according to claim 2, characterized in that, The number of limiting blocks (4) is at least two, and at least two limiting blocks (4) are evenly distributed along the circumference of the connecting pipe (3).

4. A water connection structure for an engine according to claim 2, characterized in that, There are gaps between the two ends of the connecting pipe (3) and the inner wall end face of the adjacent seat hole (5).

5. A water connection structure for an engine according to claim 1, characterized in that, Both ends of the sealing sleeve (32) have extensions that extend to the outside of the end of the steel pipe liner (31).

6. A water connection structure for an engine according to claim 1, characterized in that, The sealing sleeve (32) is a vulcanized rubber sleeve, and the compression rate of the vulcanized rubber is 75%.

7. A water connection structure for an engine according to claim 1, characterized in that, The inner lining (31) of the steel pipe is a seamless steel pipe, and the inner lining (31) of the steel pipe expands under high temperature and forms a hard contact engagement with the inner wall of the seat hole (5).

8. A water connection structure for an engine according to claim 1, characterized in that, When the two ends of the connecting tube (3) are pressed into the adjacent seat hole (5), the annular protrusion (33) undergoes elastic deformation to generate surface pressure to compensate for the small gap between the joint parts.

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