Fuel pump structure

Abstract

A fuel pump structure comprises a pump body, an impeller and a motor assembly. The pump body is cylindrical; the motor assembly and the impeller are both installed in the pump body, and the impeller is installed at the lower end of the motor assembly and faces a liquid inlet located in the pump body. The motor assembly is in a flat shape, the circumferential face of the motor assembly comprises two symmetrical planes and two symmetrical arc faces, and flow channels are formed between the two planes of the motor assembly and the circular inner wall of the pump body respectively. By arranging the flat motor assembly, the size and the power of the motor assembly can be guaranteed under the condition that the outer diameter of the pump body is reduced; and the motor assembly is provided with two planes which can form a flow channel with the circular inner wall of the pump body, so that the flow channel is not reduced too much on the premise that the outer diameter of the pump body is reduced, the suction efficiency of the fuel pump is guaranteed on the whole, and the use requirement of a small-caliber oil drum can be met.

Description

Technical Field

[0001] This utility model relates to the technical field of pumps, and in particular to a fuel pump structure. Background Technology

[0002] Currently, fuel pumps are commonly used to extract oil from oil drums; for example, a portable refueling pump disclosed in Chinese patent CN217025334U and an electric kerosene suction device disclosed in Chinese patent CN219953679U both have a pump body that can extend into the opening of the oil drum.

[0003] However, the minimum outer diameter of the existing fuel pump body is 33mm, while many fuel containers in the European market have a diameter of only 29mm, making it impossible to fit the pump body inside. Furthermore, the existing fuel pump body is designed for a flow rate of 9LPM, which is already low. Reducing the flow rate would result in a significant decrease in efficiency. To ensure that efficiency does not change drastically, the motor size cannot change significantly. If the motor size does not change significantly, reducing the outer diameter naturally requires a smaller flow channel. A smaller flow channel naturally affects the flow rate, and a significant decrease in flow rate will also result in a loss of pumping efficiency.

[0004] Moreover, existing fuel pumps typically only have a simple sealing ring structure between the motor and the pump body. Due to the high speed of the motor, the sealing ring is easily worn, resulting in a failure to seal. This is especially true when the pump is running idle, which can exacerbate the wear on the sealing ring, leading to leakage from the fuel pump liner, causing the motor to burn out, and reducing the service life of the fuel pump. Utility Model Content

[0005] The purpose of this invention is to provide a fuel pump structure that has the advantages of small size and high suction efficiency.

[0006] To achieve the above objectives, the solution of this utility model is:

[0007] A fuel pump structure includes a pump body, an impeller, and a motor assembly;

[0008] The pump body is cylindrical, with an inlet at the lower end and an outlet at the upper end.

[0009] Both the motor assembly and the impeller are installed inside the pump body. The impeller is installed at the lower end of the motor assembly and is positioned opposite the liquid inlet of the pump body.

[0010] The motor assembly is flat and has two symmetrical planes and two symmetrical arc surfaces on its circumference. The two planes of the motor assembly form flow channels with the circular inner wall of the pump body, which connect the inlet and outlet. The other two arc surfaces of the motor assembly are respectively attached to the circular inner wall of the pump body.

[0011] Furthermore, the motor assembly includes a motor, a motor housing, and a housing sealing plug; the motor is flat, and the shape of the motor space inside the motor housing is adapted to the outline of the motor; the bottom of the motor space has a shaft hole communicating with the outside, and the top of the motor space is open to form an installation port; the motor is installed into the motor space from the installation port, and the housing sealing plug is sealed and installed at the installation port; the motor shaft at the lower end of the motor passes through the shaft hole, and an elastic sealing plate sealing the shaft hole is fitted on the motor shaft.

[0012] Furthermore, the elastic sealing sheet is located within the motor space; a flange is provided around the bottom surface of the motor space at the outer periphery of the shaft hole; the outer edge of the elastic sealing sheet is pressed and sealed between the flange and the lower end face of the motor; the middle part of the elastic sealing sheet has a through hole with an inner diameter smaller than that of the motor shaft, and when the motor shaft passes through the through hole, the middle part of the elastic sealing sheet protrudes towards the shaft hole and forms an interference fit sealing lip with the motor shaft.

[0013] Furthermore, the outer casing sealing plug is fitted into the mounting port; the lower part of the outer casing sealing plug extends into the motor space, the shape of the lower part of the outer casing sealing plug is adapted to the contour of the motor space, and the peripheral wall of the lower part of the outer casing sealing plug forms an annular groove, and an elastic sealing ring is fitted at the annular groove; the elastic sealing ring is racetrack shaped, the inner ring wall of the elastic sealing ring is tightly fitted to the annular groove, and the outer ring wall of the elastic sealing ring is tightly attached to the inner wall of the motor space.

[0014] Furthermore, the central peripheral wall of the outer casing sealing plug has several circumferentially spaced locking blocks, and the mounting port side wall of the motor casing has locking holes for the locking blocks to be inserted.

[0015] Furthermore, a wire clip is provided in the middle of the outer casing sealing plug, through which the connection wire of the power supply motor passes.

[0016] Furthermore, the lower end face of the motor assembly and the junction of the two planes are provided with an arc-shaped chamfer.

[0017] Furthermore, the pump body includes an upper pump body and a lower cover; the lower cover is snapped into the lower opening at the bottom of the upper pump body, and the upper inner wall of the upper pump body has several circumferentially spaced hooks protruding from the upper side, and the top of the upper pump body is provided with the liquid outlet; the upper outer periphery of the motor assembly has a groove for each hook to be snapped and fixed, and the motor assembly is installed from the lower opening upwards and fixed to each hook; the lower cover has the liquid inlet.

[0018] Furthermore, the circular inner wall of the pump body has limiting ribs protruding from two planes facing the motor assembly, and the limiting ribs abut against the center of the plane of the motor assembly.

[0019] By adopting the above technical solution, the flat motor assembly can ensure the volume of the motor assembly while reducing the outer diameter of the pump body, thereby ensuring the power of the motor assembly. Furthermore, the motor assembly has two planes that can form a flow channel with the circular inner wall of the pump body. This ensures that the flow channel is not reduced too much while reducing the outer diameter of the pump body. The reduced flow channel can be compensated for by slightly increasing the motor speed, thus ensuring the overall pumping efficiency of the fuel pump and meeting the needs of small-diameter oil drums. Attached Figure Description

[0020] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0022] Figure 3 This is an exploded three-dimensional sectional view of an embodiment of the present utility model;

[0023] Figure 4 This is an exploded view of an embodiment of the present utility model;

[0024] Figure 5 This is another cross-sectional view of an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram illustrating the fit between the elastic sealing sheet and the motor shaft in an embodiment of this utility model.

[0026] Labeling: Pump body 1, Inlet 11, Outlet 12, Circular inner wall 13, Upper pump body 14, Lower opening 141, Lower cover 15, Hook 16, Limiting rib 17, Impeller 2, Motor assembly 3, Flat surface 31, Arc surface 32, Arc chamfer 33, Motor 34, Motor shaft 341, Connecting wire 342, Motor housing 35, Locking hole 351, Upper edge 352, Housing sealing plug 36, Ring groove 361, Locking block 362, Wire clamp 363, Upper locking block 364, Motor space 37, Shaft hole 371, Mounting port 372, Flange 373, Locking groove 38, Flow channel 4, Elastic sealing sheet 5, Outer edge 51, Through hole 52, Sealing lip 53, Elastic sealing ring 6, Inner ring wall 61, Outer ring wall 62. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] like Figures 1 to 5 As shown, a fuel pump structure in this embodiment includes a pump body 1, an impeller 2, and a motor assembly 3.

[0029] like Figure 1 and Figure 2 The pump body 1 is cylindrical, which facilitates insertion through the opening of the oil drum. The pump body 1 has a liquid inlet 11 at the lower end and a liquid outlet 12 at the upper end. The motor assembly 3 and the impeller 2 are both installed inside the pump body 1. The impeller 2 is installed at the lower end of the motor assembly 3 and is positioned opposite the liquid inlet 11 of the pump body 1. The motor assembly 3 drives the impeller 2 to rotate, so as to draw liquid from the liquid inlet 11 and then discharge it from the liquid outlet 12.

[0030] See Figure 4 and Figure 5 The motor assembly 3 is flat and has two symmetrical planes 31 and two symmetrical arc surfaces 32 on its circumference. The two planes 31 of the motor assembly 3 form flow channels 4 between themselves and the circular inner wall 13 of the pump body 1. The flow channels 4 connect the inlet 11 and the outlet 12. The other two arc surfaces 32 of the motor assembly 3 can be attached to the circular inner wall 13 of the pump body 1.

[0031] Therefore, by setting up a flat motor assembly 3, the volume of the motor assembly 3 can be guaranteed while reducing the outer diameter of the pump body 1, thereby ensuring the power of the motor assembly 3; and the motor assembly 3 has two planes 31 that can form a flow channel 4 with the circular inner wall 13 of the pump body 1. Thus, even with the reduction of the outer diameter of the pump body 1, the flow channel 4 is not reduced too much. The reduced flow channel 4 can be compensated for by slightly increasing the motor speed, so as to ensure the overall pumping efficiency of the fuel pump and meet the needs of small-diameter oil drums.

[0032] like Figure 2 and Figure 4 As shown, the lower end face of the motor assembly 3 in this embodiment has an arc-shaped chamfer 33 at the junction of the two planes 31. By setting the arc-shaped chamfer 33 for transition, the resistance can be reduced, making it easier for the impeller 2 to drive the liquid to flow into the flow channel 4, and ensuring the flow rate is maintained even with a slight increase in motor speed.

[0033] like Figure 3 and Figure 4In this embodiment, the motor assembly 3 includes a motor 34, a motor housing 35, and a housing sealing plug 36. The motor 34 is flat, and the shape of the motor space 37 inside the motor housing 35 is adapted to the outline of the motor 34. The bottom of the motor space 37 has a shaft hole 371 that communicates with the outside, and the top of the motor space 37 is open to form an installation port 372. The motor 34 is installed into the motor space 37 through the installation port 372, and the housing sealing plug 36 is sealed and installed at the installation port 372. The motor shaft 341 at the lower end of the motor 34 passes through the shaft hole 371 for mounting the impeller 2, and an elastic sealing sheet 5 that seals the shaft hole 371 is fitted on the motor shaft 341.

[0034] By setting the elastic sealing sheet 5 and the outer casing sealing plug 36, the motor 34 can be sealed and installed inside the motor casing 35 to prevent water leakage; and it also facilitates the assembly, maintenance and replacement of the product.

[0035] Specifically, such as Figure 2 The elastic sealing sheet 5 is located within the motor space 37; a flange 373 is provided around the bottom surface of the motor space 37 at the outer periphery of the shaft hole 371; the outer edge 51 of the elastic sealing sheet 5 is pressed and sealed between the flange 373 and the lower end face of the motor 34; see also Figure 6 The elastic sealing sheet 5 has a through hole 52 in the middle with an inner diameter smaller than that of the motor shaft 341. When the motor shaft 341 passes through the through hole 52, the middle part of the elastic sealing sheet 5 protrudes toward the shaft hole 371 and forms a sealing lip 53 that is interference-fitted to the motor shaft 341.

[0036] Therefore, after the liquid enters the motor space 37 from the shaft hole 371, it will be blocked by the flange 373 and the outer edge 51 of the elastic sealing sheet 5, and will not continue to flow into the motor space 37 and affect the motor 34. Moreover, the sealing lip 53 formed in the middle of the elastic sealing sheet 5 is a structure that protrudes towards the shaft hole 371. When the motor shaft 341 rotates, the liquid will not flow towards the motor 34. The sealing lip 53 is also interference-fitted to the motor shaft 341, but the clamping force is small, which can prevent the sealing lip 53 from being worn quickly, effectively ensuring the sealing effect and service life, and preventing liquid leakage.

[0037] And such Figure 3 and Figure 4As shown, the outer casing sealing plug 36 is engaged with the mounting port 372; the lower part of the outer casing sealing plug 36 extends into the motor space 37, the shape of the lower part of the outer casing sealing plug 36 is adapted to the contour of the motor space 37, and the peripheral wall of the lower part of the outer casing sealing plug 36 forms an annular groove 361, at which an elastic sealing ring 6 is engaged; the elastic sealing ring 6 may be racetrack shaped, the inner ring wall 61 of the elastic sealing ring 6 is tightly fitted with the annular groove 361, and the outer ring wall 62 of the elastic sealing ring 6 is tightly attached to the inner wall of the motor space 37. The elastic sealing ring 6 is provided to seal the mounting port 372 and prevent leakage.

[0038] In this embodiment, the inner diameter of the elastic sealing ring 6 can be slightly smaller than the inner diameter of the ring groove 361 to ensure a tight fit and secure fastening. Furthermore, the outer diameter of the elastic sealing ring 6 can be approximately equal to the inner diameter of the inner wall of the motor space 37 to prevent the outer diameter of the elastic sealing ring 6 from being too large to fit into the mounting opening 372. Moreover, when the elastic sealing ring 6 is inserted into the mounting opening 372, the pressure on the inner side of the elastic sealing ring 6 can cause its outer diameter to move outwards and adhere tightly to the inner wall of the motor space 37, preventing leakage at the outer side of the elastic sealing ring 6 and effectively ensuring the service life of the motor 34.

[0039] The outer casing sealing plug 36 has several circumferentially spaced locking blocks 362 on its central peripheral wall, and the mounting opening 372 of the motor housing 35 has locking holes 351 for the locking blocks 362 to be engaged. In this embodiment, a wedge-shaped locking block 362 is provided on each of the four sides of the outer casing sealing plug 36 to facilitate the engagement of the outer casing sealing plug 36 into the mounting opening 372 for fixation.

[0040] Meanwhile, a wire clip 363 may be provided in the middle of the outer casing sealing plug 36, through which the connecting wire 342 of the power supply 344 passes to ensure a waterproof sealing effect between the connecting wire 342 and the motor 34.

[0041] like Figure 3 and Figure 4 In this embodiment, the pump body 1 includes an upper pump body 14 and a lower cover 15. The lower cover 15 is snapped into the lower opening 141 at the bottom of the upper pump body 14. The upper circular inner wall 13 of the upper pump body 14 has several circumferentially spaced hooks 16 protruding from it. In this embodiment, four circumferentially spaced hooks 16 are provided. At the same time, the liquid outlet 12 is provided at the top of the upper pump body 14.

[0042] Correspondingly, the upper outer periphery of the motor assembly 3 has slots 38 for each hook 16 to be engaged and fixed. In this embodiment, an upper locking block 364 is provided on each of the four sides of the upper part of the outer casing sealing plug 36 of the motor assembly 3. When the outer casing sealing plug 36 is engaged into the installation port 372, each upper locking block 364 forms four slots 38 with the upper edge 352 of the motor casing 35. Thus, the motor assembly 3 can be installed and fixed to each hook 16 from the lower opening 141 upwards. The overall installation operation is convenient and quick, and the motor assembly 3 can be stably and reliably installed inside the pump body 1.

[0043] The lower cover 15 has the liquid inlet 11.

[0044] Also see Figure 2 and Figure 5 The circular inner wall 13 inside the pump body 1 can protrude limiting ribs 17 towards the two planes 31 of the motor assembly 3, respectively. The limiting ribs 17 abut against the middle of the planes 31 of the motor assembly 3. The limiting ribs 17 can further improve the limiting stability of the motor assembly 3 and prevent the motor assembly 3 from rotating inside the pump body 1, ensuring the normal rotation of the impeller 2 and guaranteeing the oil suction effect.

[0045] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of this utility model should still fall within the protection scope of this utility model.

[0046] In the description of the embodiments of this application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

Claims

1. A fuel pump structure, characterized in that: Includes pump body, impeller and motor assembly; The pump body is cylindrical, with an inlet at the lower end and an outlet at the upper end. Both the motor assembly and the impeller are installed inside the pump body. The impeller is installed at the lower end of the motor assembly and is positioned opposite the liquid inlet of the pump body. The motor assembly is flat and has two symmetrical planes and two symmetrical arc surfaces on its circumference. The two planes of the motor assembly form flow channels with the circular inner wall of the pump body, which connect the inlet and outlet. The other two arc surfaces of the motor assembly are respectively attached to the circular inner wall of the pump body.

2. The fuel pump structure according to claim 1, characterized in that: The motor assembly includes a motor, a motor housing, and a housing sealing plug; the motor is flat, and the shape of the motor space inside the motor housing is adapted to the outline of the motor; The motor space has a shaft hole at the bottom that connects to the outside, and the top of the motor space is open to form an installation port; the motor is installed into the motor space from the installation port, and the outer casing sealing plug is sealed at the installation port; the motor shaft at the lower end of the motor passes through the shaft hole, and an elastic sealing plate that seals the shaft hole is fitted on the motor shaft.

3. The fuel pump structure according to claim 2, characterized in that: The elastic sealing sheet is located within the motor space; a flange is provided around the bottom surface of the motor space at the outer periphery of the shaft hole; the outer edge of the elastic sealing sheet is pressed and sealed between the flange and the lower end face of the motor; the middle part of the elastic sealing sheet has a through hole with an inner diameter smaller than that of the motor shaft, and when the motor shaft passes through the through hole, the middle part of the elastic sealing sheet protrudes towards the shaft hole and forms an interference fit sealing lip with the motor shaft.

4. The fuel pump structure according to claim 2, characterized in that: The outer casing sealing plug is fitted into the mounting port; the lower part of the outer casing sealing plug extends into the motor space, the shape of the lower part of the outer casing sealing plug is adapted to the contour of the motor space, and the peripheral wall of the lower part of the outer casing sealing plug forms an annular groove, and an elastic sealing ring is fitted at the annular groove; the elastic sealing ring is racetrack shaped, the inner ring wall of the elastic sealing ring is tightly fitted to the annular groove, and the outer ring wall of the elastic sealing ring is tightly attached to the inner wall of the motor space.

5. The fuel pump structure according to claim 4, characterized in that: The outer casing sealing plug has several circumferentially spaced locking blocks on its central peripheral wall, and the mounting port side wall of the motor casing has locking holes for the locking blocks to be inserted.

6. The fuel pump structure according to claim 4, characterized in that: A wire clip is provided in the middle of the outer casing sealing plug, through which the power supply motor's connection wire passes.

7. The fuel pump structure according to claim 1, characterized in that: The lower end face of the motor assembly and the junction of the two planes are provided with an arc-shaped chamfer.

8. The fuel pump structure according to claim 1, characterized in that: The pump body includes an upper pump body and a lower cover; the lower cover is snapped into the lower opening at the bottom of the upper pump body, and the upper inner wall of the upper pump body has several circumferentially spaced hooks protruding from the upper side, and the top of the upper pump body is provided with the liquid outlet; the upper outer periphery of the motor assembly has a groove for each hook to be snapped and fixed, and the motor assembly is installed from the lower opening upwards and fixed to each hook; the lower cover has the liquid inlet.

9. A fuel pump structure according to claim 1, characterized in that: The inner circular wall of the pump body has limiting ribs protruding from two planes facing the motor assembly, and the limiting ribs abut against the middle of the plane of the motor assembly.

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