A multi-stage leak-proof sealing structure for automotive fuel pumps

Abstract

This utility model relates to the field of automotive engineering, and more particularly to a multi-stage leak-proof sealing structure for an automotive fuel pump. This utility model provides a multi-stage leak-proof sealing structure for an automotive fuel pump capable of multi-stage sealing to prevent fuel leakage and improve sealing performance. The multi-stage leak-proof sealing structure for an automotive fuel pump includes a pump body, etc., with an impeller rotating shaft rotatably connected to the middle of the pump body, and a sealing cover fitted inside the right side of the pump body. In this utility model, a first sealing ring is fitted onto the sealing cover, and a shaft sleeve is fixed to the impeller rotating shaft by a second screw, so that the second sealing ring is located between the sealing cover and the shaft sleeve, and a third sealing ring is located between the sealing cover and the bearing. The pump cover is passed through the impeller rotating shaft, so that the pump cover contacts the first sealing ring, and then the pump cover is fixed to the pump body, achieving the effect of multi-stage sealing to prevent fuel leakage and improve sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of automotive engineering, and in particular to a multi-stage leak-proof sealing structure for automotive fuel pumps. Background Technology

[0002] In today's rapidly developing automotive industry, the performance of the fuel pump, as a core component of the fuel supply system, directly affects the overall operation and safety of the vehicle. The main responsibility of the fuel pump is to accurately and stably deliver fuel from the fuel tank to the engine, providing sufficient power for the engine's combustion process. The sealing performance of the bearings and bushings in the fuel pump is of paramount importance, playing a decisive role in preventing fuel leakage.

[0003] For example, a fuel pump sealing structure with publication number CN203655465U includes a fuel tank with a pump inlet, a fuel pump, and a sealing structure. The fuel pump includes a cylindrical part with a flange at its upper end, and a stepped part at the edge of the pump inlet of the fuel tank. The cylindrical part and the flange respectively mate with the steps of the stepped part. The sealing structure includes an integrally formed axial sealing structure and a radial sealing structure. The axial sealing structure is disposed between the flange and the stepped part, and the radial sealing structure is disposed between the cylindrical part and the stepped part. This structure seals both the radial and axial directions of the fuel pump. When bearings and bushings need to be installed on the rotating shaft of the fuel pump, a simple single-layer sealing ring is usually used. However, under complex usage conditions, oil leakage may still occur, resulting in poor sealing performance.

[0004] Therefore, it is necessary to design a multi-stage leak-proof sealing structure for automotive fuel pumps that can perform multi-stage sealing to prevent fuel leakage and improve the sealing effect. Utility Model Content

[0005] To overcome the shortcomings of using a simple single-layer seal ring when bearings and bushings are installed on the rotating shaft of a fuel pump, which may still lead to oil leakage and poor sealing effect under complex usage conditions, this utility model provides a multi-stage leak-proof sealing structure for automotive fuel pumps that can perform multi-stage sealing to prevent fuel leakage and improve sealing effect.

[0006] Technical solution: A multi-stage leak-proof sealing structure for an automotive fuel pump, comprising a pump body, an impeller rotating shaft, a sealing cover, a cooling component, and a sealing component. The impeller rotating shaft is rotatably connected to the middle of the pump body. A sealing cover is fitted inside the right side of the pump body, and a sealing cover is fitted to the left side of the impeller rotating shaft. The sealing cover contacts the inner side of the right side of the pump body. A cooling component capable of injecting lubricating oil for cooling is provided on the right side of the pump body. A sealing component capable of multi-stage sealing is provided inside the pump body.

[0007] In one embodiment, the cooling assembly includes a pump cover, an oil inlet, a first screw, a first sealing ring, a second limiting block, and a fourth sealing ring. The pump cover is detachably connected to the right side of the pump body via multiple first screws. An oil inlet is connected to the upper side of the pump cover. A first sealing ring is sleeved between the pump body and the pump cover. The first sealing ring is sleeved with a sealing cap. A second limiting block is connected to the inner left side of the pump cover. A fourth sealing ring is rotatably connected to the middle of the pump cover. The fourth sealing ring is sleeved with the impeller rotating shaft.

[0008] In one embodiment, the oil filler nozzle is threaded with a knob.

[0009] In one embodiment, a sealing assembly is also included, comprising a second sealing ring, a third sealing ring, a bushing, a second screw, a bearing, and a first limiting block. The second sealing ring is fitted onto the impeller rotating shaft, and the bushing is detachably connected to the right side of the impeller rotating shaft via the second screw. The second sealing ring is located between the sealing cover and the bushing, and the bearing is snapped onto the bushing. The third sealing ring is placed between the sealing cover and the bearing. The first limiting block is connected to the inner side of the right side of the pump body and contacts the sealing cover.

[0010] In one embodiment, both the first screw and the second screw have hexagonal slots.

[0011] In one embodiment, both the second and third sealing rings are made of rubber.

[0012] Beneficial effects: 1. This utility model places the first sealing ring on the sealing cover, fixes the bushing to the impeller rotating shaft with the second screw, so that the second sealing ring is located between the sealing cover and the bushing, and the third sealing ring is located between the sealing cover and the bearing. The pump cover is passed through the impeller rotating shaft so that the pump cover contacts the first sealing ring, and then the pump cover is fixed to the pump body, thus achieving the effect of multi-stage sealing, preventing fuel leakage and improving the sealing effect.

[0013] 2. This utility model introduces a method where lubricating oil is added to the pump cover through an oil injection nozzle, filling the pump cover with lubricating oil. The lubricating oil lubricates and cools the bushing, achieving the effect of sealing the bushing with oil and facilitating cooling and lubrication. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the bearing and the second limiting block of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the first sealing ring and impeller rotating shaft of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the bushing and second screw components of this utility model.

[0018] The markings in the diagram are as follows: 1-Pump body, 2-Pump cover, 3-Oil nozzle, 4-First screw, 5-First sealing ring, 6-Impeller rotating shaft, 7-Sealing cover, 8-Second sealing ring, 9-Third sealing ring, 10-Shaft sleeve, 11-Second screw, 12-Bearing, 13-First limiting block, 14-Second limiting block, 15-Fourth sealing ring. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0020] A multi-stage leak-proof sealing structure for automotive fuel pumps, such as Figures 1-4 As shown, the pump includes a pump body 1, an impeller rotating shaft 6, a sealing cover 7, a cooling component, and a sealing component. The impeller rotating shaft 6 is rotatably connected to the middle of the pump body 1. The sealing cover 7 is fitted inside the right side of the pump body 1. The sealing cover 7 is fitted on the left side of the impeller rotating shaft 6. The sealing cover 7 is in contact with the inner side of the right side of the pump body 1. The right side of the pump body 1 is provided with a cooling component, and the pump body 1 is provided with a sealing component inside.

[0021] like Figures 1-3 As shown, the cooling assembly includes a pump cover 2, an oil inlet 3, a first screw 4, a first sealing ring 5, a second limiting block 14, and a fourth sealing ring 15. The pump cover 2 is detachably connected to the right side of the pump body 1 by four first screws 4. The oil inlet 3 is connected to the upper side of the pump cover 2. The oil inlet 3 has a threaded knob for easy gripping. The first sealing ring 5 is sleeved between the pump body 1 and the pump cover 2. The first sealing ring 5 is sleeved with the sealing cover 7. The second limiting block 14 is connected to the inner left side of the pump cover 2. The fourth sealing ring 15 is rotatably connected to the middle of the pump cover 2. The fourth sealing ring 15 is sleeved with the impeller rotating shaft 6.

[0022] like Figures 2-4 As shown, it also includes a sealing assembly, which includes a second sealing ring 8, a third sealing ring 9, a bushing 10, a second screw 11, a bearing 12, and a first limiting block 13. The second sealing ring 8 is fitted onto the impeller rotating shaft 6. The right side of the impeller rotating shaft 6 is detachably connected to the bushing 10 via the second screw 11. Both the first screw 4 and the second screw 11 have hexagonal grooves for easy connection. The second sealing ring 8 is located between the sealing cover 7 and the bushing 10. The bearing 12 is snapped onto the bushing 10. The third sealing ring 9 is placed between the sealing cover 7 and the bearing 12. Both the second sealing ring 8 and the third sealing ring 9 are made of rubber for easy sealing. The first limiting block 13 is connected to the inner right side of the pump body 1 and contacts the sealing cover 7.

[0023] When using this utility model, firstly, place the pump body 1 in the automotive fuel pump installation area, then put the sealing cover 7 on the impeller rotating shaft 6 so that the sealing cover 7 contacts the first limiting block 13, then put the first sealing ring 5 on the sealing cover 7 so that the first sealing ring 5 contacts the inner side of the pump body 1, then fix the bushing 10 on the impeller rotating shaft 6 with the second screw 11 so that the second sealing ring 8 is located between the sealing cover 7 and the bushing 10, then fix the inner ring of the bearing 12 on the bushing 10 with an interference fit so that the third sealing ring 9 is located between the sealing cover 7 and the bearing 12, then pass the pump cover 2 through the impeller rotating shaft 6 so that the pump cover 2 contacts the first sealing ring 5 and the second limiting block 14 contacts the outer ring of the bushing 10, then fix the pump cover 2 to the pump body 1 with the first screw 4. Through the cooperation of the sealing cover 7, the first sealing ring 5, the second sealing ring 8, and the third sealing ring 9, multi-stage sealing is achieved, thereby preventing fuel leakage and improving the sealing effect;

[0024] After installation, turn the knob to open and add lubricating oil into the pump cover 2 through the grease nipple 3, filling the pump cover 2 with lubricating oil. The lubricating oil lubricates and cools the bushing 10, thus sealing the bushing 10 for easy cooling and lubrication. Then, the impeller shaft 6 is connected to an external motor, which drives the impeller shaft 6 to rotate. The rotation of the impeller shaft 6 draws fuel and seals it through the fourth sealing ring 15.

[0025] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A multi-stage leak-proof sealing structure for an automotive fuel pump, characterized in that, It includes a pump body (1), an impeller rotating shaft (6), a sealing cover (7), a cooling component and a sealing component. The impeller rotating shaft (6) is rotatably connected to the middle of the pump body (1). The sealing cover (7) is fitted inside the right side of the pump body (1). The sealing cover (7) is fitted to the left side of the impeller rotating shaft (6). The sealing cover (7) is in contact with the inner side of the right side of the pump body (1). The right side of the pump body (1) is provided with a cooling component that can inject lubricating oil for cooling. The pump body (1) is provided with a sealing component that can perform multi-stage sealing.

2. The multi-stage leak-proof seal structure of a fuel pump for an automobile according to claim 1, wherein The cooling assembly includes a pump cover (2), an oil nozzle (3), a first screw (4), a first sealing ring (5), a second limiting block (14), and a fourth sealing ring (15). The pump cover (2) is detachably connected to the right side of the pump body (1) by multiple first screws (4). An oil nozzle (3) is connected to the upper side of the pump cover (2). The first sealing ring (5) is sleeved between the pump body (1) and the pump cover (2). The first sealing ring (5) is sleeved with the sealing cover (7). The second limiting block (14) is connected to the inner left side of the pump cover (2). The fourth sealing ring (15) is rotatably connected to the middle of the pump cover (2). The fourth sealing ring (15) is sleeved with the impeller rotating shaft (6).

3. The multi-stage leak-proof seal structure of a fuel pump for an automobile according to claim 2, characterized in that, The oil nozzle (3) has a screw thread with a knob.

4. The multi-stage leak-proof seal structure of a fuel pump for an automobile according to claim 1, wherein It also includes a sealing assembly, which includes a second sealing ring (8), a third sealing ring (9), a bushing (10), a second screw (11), a bearing (12), and a first limiting block (13). The second sealing ring (8) is fitted on the impeller rotating shaft (6). The bushing (10) is detachably connected to the right side of the impeller rotating shaft (6) through the second screw (11). The second sealing ring (8) is located between the sealing cover (7) and the bushing (10). The bearing (12) is snapped onto the bushing (10). The third sealing ring (9) is placed between the sealing cover (7) and the bearing (12). The first limiting block (13) is connected to the inner side of the right side of the pump body (1). The first limiting block (13) is in contact with the sealing cover (7).

5. A multi-stage leak-proof sealing structure for an automotive fuel pump according to claim 4, characterized in that, Both the first screw (4) and the second screw (11) have hexagonal slots.

6. A multi-stage leak-proof sealing structure for an automotive fuel pump according to claim 4, characterized in that, Both the second sealing ring (8) and the third sealing ring (9) are made of rubber.

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