Sealing structure of cooling water pump of internal combustion engine vehicle

Abstract

The utility model discloses an internal combustion locomotive cooling water pump sealing structure, including the outer tube, the outer tube bottom is equipped with disc spring, the outer tube is equipped with the compression ring, the compression ring upper end is equipped with the dynamic ring, the dynamic ring is the circular non-equal width structure of narrow upper wide, the dynamic ring bottom inner wall is equipped with the first sealing washer, the dynamic ring upper end is equipped with the static ring, the static ring lateral wall is equipped with the second sealing washer, the outer tube is equipped with the position limiting mechanism for limiting the dynamic ring, the position limiting mechanism includes two limit frame fixed connection in the outer tube inner wall, the dynamic ring upper end is equipped with two limit slot can with limit frame cooperation. The device improves the cooperation structure of water pump mechanical seal and shaft, cancels the shaft sleeve of mechanical seal to reduce a heavy leakage risk, and optimizes static ring base to sealing washer adaptation structure, when the dynamic ring rotates, the uneven pressure that static ring suffers can drive its slight float, can effectively disperse pressure, can ensure dynamic ring and static ring sealing end face stress uniformity, promotes the sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a sealing structure for a cooling water pump of an internal combustion locomotive. Background Technology

[0002] The water pump of an internal combustion locomotive is the core power component of the locomotive cooling system. It is mainly responsible for driving the coolant to circulate within the cooling system, carrying away the high-temperature heat generated by key components such as the diesel engine and turbocharger during operation, preventing components from being damaged due to overheating, and ultimately ensuring that the locomotive operates stably within a suitable temperature range.

[0003] Currently, the water pump structure of the HXN5 diesel locomotive needs to be adapted to a three-lip PTFE oil seal. Its water seal adopts an integrated design with a flange, and the water pump shaft is mounted on the outside of the mechanical seal and rotates synchronously with the main shaft. The overall structure is relatively complex. Moreover, the shaft and the mechanical seal shaft sleeve, as well as the mechanical seal rotating ring and the shaft, are all sealed by rubber contact, which poses a risk of seal leakage. The stationary ring is an L-shaped rubber-wrapped silicon carbide ring, which sits on the flange. When the rotating ring rotates, the disc spring pressure is unevenly distributed and difficult to effectively disperse, which easily leads to uneven wear between the rotating ring and the stationary ring, and thus causes leakage. In order to solve the above problems, this utility model proposes a sealing structure for the cooling water pump of a diesel locomotive. Utility Model Content

[0004] The main objective of this invention is to provide a sealing structure for a cooling water pump in an internal combustion locomotive, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sealing structure for a cooling water pump in an internal combustion locomotive includes an outer cylinder, a disc spring at the bottom of the outer cylinder, a pressure ring inside the outer cylinder, a moving ring at the upper end of the pressure ring, the moving ring being a circular non-uniform width structure that is narrower at the top and wider at the bottom, a first sealing ring at the bottom inner wall of the moving ring, a stationary ring at the upper end of the moving ring, a second sealing ring sleeved on the side wall of the stationary ring, and a limiting mechanism inside the outer cylinder for limiting the position of the moving ring. The limiting mechanism includes two limiting frames fixedly connected to the inner wall of the outer cylinder, two limiting grooves that can cooperate with the limiting frames at the upper end of the moving ring, and two through holes on the side wall of the outer cylinder, with set screws threaded into the through holes.

[0007] Preferably, the first sealing ring is made of fluororubber material, and the second sealing ring is also made of fluororubber material.

[0008] Preferably, the moving ring is made of silicon carbide, and the stationary ring is also made of silicon carbide.

[0009] Preferably, the upper end of the outer cylinder has two through grooves, and the upper end of the pressure ring has two arc-shaped grooves.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This device optimizes the sealing mechanism design. By improving the fit structure between the water pump mechanical seal and the shaft, the shaft sleeve of the mechanical seal is eliminated to reduce the risk of secondary leakage. The stationary ring base is optimized into a sealing ring adapter structure. When the rotating ring rotates, the uneven pressure on the stationary ring can drive it to float slightly, which can effectively disperse the pressure and ensure that the sealing end faces of the rotating ring and the stationary ring are evenly stressed, thus improving the sealing reliability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the sealing structure of a cooling water pump for an internal combustion locomotive proposed in this utility model;

[0013] Figure 2 for Figure 1 Side view;

[0014] Figure 3 This is a perspective view of the outer cylinder and pressure ring of a sealing structure for a cooling water pump in an internal combustion locomotive, as proposed in this utility model.

[0015] Figure 4 The present invention provides a top and bottom view of the dynamic ring of a cooling water pump sealing structure for an internal combustion locomotive.

[0016] Figure 5 The present invention provides a static ring top view and bottom view of a sealing structure for a cooling water pump of an internal combustion locomotive.

[0017] Figure 6 This is a schematic diagram of the installation of the sealing structure for the cooling water pump of an internal combustion locomotive proposed in this utility model;

[0018] Figure 7 A 3D view of a traditional stationary ring mounting base.

[0019] In the diagram: 1 Outer cylinder, 2 Disc spring, 3 Pressure ring, 4 First sealing ring, 5 Moving ring, 6 Stationary ring, 7 Second sealing ring, 8 Through hole, 9 Set screw, 10 Limiting frame, 11 Through groove, 12 Arc groove, 13 Limiting groove. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figure 1-7A sealing structure for a cooling water pump in an internal combustion locomotive includes an outer cylinder 1, a disc spring 2 at the bottom of the outer cylinder 1, a pressure ring 3 inside the outer cylinder 1, and a moving ring 5 at the upper end of the pressure ring 3. The moving ring 5 is a circular non-uniform width structure that is narrower at the top and wider at the bottom. A first sealing ring 4 is provided on the inner wall of the bottom of the moving ring 5, and a stationary ring 6 is provided on the upper end of the moving ring 5. A second sealing ring 7 is fitted on the side wall of the stationary ring 6. The diameter of the upper end of the moving ring 5 is smaller than the diameter of the lower end of the stationary ring 6. When the moving ring 5 and the stationary ring 6 are slidably connected, the contact area caused by shaking is reduced, thereby reducing the friction between the two and improving their service life. The first sealing ring 4 on the inner wall of the bottom of the moving ring 5 and the second sealing ring 7 on the side wall of the stationary ring 6 form a double sealing protection. Combined with the diameter difference design to reduce shaking, the sealing reliability is further improved and the risk of leakage is reduced. The combination of the disc spring 2 and the pressure ring 3 provides a stable preload for the moving ring 5 and the stationary ring 6. With the double sealing structure, it is suitable for the high-speed operation requirements of the locomotive water pump.

[0022] The outer cylinder 1 is equipped with a limiting mechanism to restrict the position of the rotating ring 5. The limiting mechanism includes two limiting frames 10 fixedly connected to the inner wall of the outer cylinder 1. The upper end of the rotating ring 5 is provided with two limiting grooves 13 that can cooperate with the limiting frames 10. The precise cooperation between the limiting frames 10 and the limiting grooves 13 can effectively limit the radial displacement of the rotating ring 5, avoid the uneven wear of the rotating ring 5 and the stationary ring 6 caused by the misalignment of the rotating ring 5, and ensure the sealing surface fit accuracy. The side wall of the outer cylinder 1 is provided with two through holes 8. The through holes 8 are internally threaded with set screws 9. The set screws are directly locked to the shaft through the through holes 8, realizing a stable connection between the outer cylinder 1 and the shaft, preventing relative displacement when the shaft rotates, and improving the overall structural stability.

[0023] In this invention, the first sealing ring 4 is made of fluororubber, and the second sealing ring 7 is also made of fluororubber. Fluororubber itself has excellent temperature resistance, oil resistance, and chemical corrosion resistance, making it fully compatible with the high-temperature coolant environment of the internal combustion locomotive cooling system and effectively extending the service life of the sealing ring. The two can also be made of materials such as nitrile rubber, polyurethane, and neoprene rubber according to the working conditions, improving the adaptability of the sealing structure in the coolant environment and meeting the needs of locomotives in different regions and with different usage intensities.

[0024] In this invention, both the rotating ring 5 and the stationary ring 6 are made of silicon carbide. Silicon carbide has high hardness and excellent wear resistance, enabling it to withstand continuous friction between the rotating ring 5 and the stationary ring 6 during high-speed rotation, significantly reducing the probability of uneven wear and solving the leakage problem caused by wear in traditional structures. Silicon carbide also has good thermal stability, making it resistant to deformation in the high-temperature environment of the locomotive cooling system, ensuring the flatness of the sealing surface and maintaining a stable sealing gap. The use of the same high-wear-resistant material for the rotating ring 5 and the stationary ring 6 avoids uneven wear caused by friction between dissimilar materials, further extending the overall service life of the sealing pair.

[0025] In this utility model, two through grooves 11 are provided at the upper end of the outer cylinder 1, and two arc-shaped grooves 12 are provided at the upper end of the pressure ring 3. By rotating the pressure ring 3, the arc-shaped grooves 12 on both sides of the pressure ring 3 are positioned in front of the adjacent limiting frame 10. Thus, the pressure ring 3 can be removed by inserting two fingers into the outer cylinder 1 through the two through grooves 11, making it convenient to replace the severely worn pressure ring 3.

[0026] In use, first press the stationary ring 6 and the second sealing ring 7 into the groove of the stationary ring sealing seat, then install the first sealing ring 4 on the inner wall of the rotating ring 5. After that, assemble the pressure ring 3 and the disc spring 2 inside the outer cylinder 1. The pressure ring 3 is set in the outer cylinder 1 near the rotating ring 5, and the disc spring 2 is set in the outer cylinder 1 near the pressure ring 3. Then, the shaft passes upward from the bottom of the stationary ring mounting seat, passing through the stationary ring 6, rotating ring 5, first sealing ring 4, pressure ring 3, disc spring 2, and outer cylinder 1 in sequence. Then, install the set screw 9 in the two through holes 8 on the side wall of the outer cylinder 1, and screw the front end of the set screw 9 into the shaft, so that the outer cylinder 1 is locked onto the shaft. When the shaft rotates, the uneven pressure on the stationary ring 6 can cause the stationary ring 6 to float slightly, dispersing the pressure and making the rotating ring 5 and the stationary ring 6 evenly stressed.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a cooling water pump of an internal combustion locomotive, comprising an outer cylinder (1), characterized in that, The outer cylinder (1) is provided with a disc spring (2) at the bottom. The outer cylinder (1) is provided with a pressure ring (3). The pressure ring (3) is provided with a moving ring (5) at the upper end. The moving ring (5) is a circular non-uniform width structure that is narrow at the top and wide at the bottom. The inner wall of the bottom of the moving ring (5) is provided with a first sealing ring (4). The upper end of the moving ring (5) is provided with a stationary ring (6). The side wall of the stationary ring (6) is fitted with a second sealing ring (7). The outer cylinder (1) is provided with a limiting mechanism for limiting the position of the moving ring (5). The limiting mechanism includes two limiting frames (10) fixedly connected to the inner wall of the outer cylinder (1). The lower end of the moving ring (5) is provided with two limiting grooves (13) that can cooperate with the limiting frames (10). The side wall of the outer cylinder (1) is provided with two through holes (8). The through holes (8) are threaded with a set screw (9).

2. The sealing structure for a cooling water pump of an internal combustion locomotive according to claim 1, characterized in that, The first sealing ring (4) is made of fluororubber material, and the second sealing ring (7) is also made of fluororubber material.

3. The sealing structure for a cooling water pump of an internal combustion locomotive according to claim 2, characterized in that, The moving ring (5) is made of silicon carbide, and the stationary ring (6) is also made of silicon carbide.

4. The sealing structure for a cooling water pump of an internal combustion locomotive according to claim 1, characterized in that, The outer cylinder (1) has two through grooves (11) at its upper end, and the pressure ring (3) has two arc-shaped grooves (12) at its upper end.

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