Gear pump body device and gear pump

Abstract

The invention discloses a gear pump body device and a gear pump, even if a pumped object is viscous liquid, normal pressure relief can be achieved, the gear pump body device comprises a gear pump head, a hanging seat and a pressure relief valve, the gear pump head is installed at the lower end of the hanging seat, an output channel is arranged in the hanging seat, the pressure relief valve is installed on the hanging seat, the pressure relief valve divides the output channel into two parts, and the output channel is communicated with the hanging seat. Comprising a first channel and a second channel, the gear pump head comprises a pump base and a gear pair installed in the pump base, the pump base is provided with a liquid inlet side making contact with / close to liquid, the pump base is provided with a liquid inlet with an opening formed in the liquid inlet side, the disengagement side of the gear pair is communicated with the liquid inlet, an oil discharging flow channel is formed in the pump base, and one end of the oil discharging flow channel is communicated with the first channel. The other end of the oil discharge flow channel is communicated with the meshing side of the gear pair, and a micropore which is communicated with the oil discharge flow channel and is opened in the liquid inlet side is formed in the pump base.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gear pump, in particular to a gear pump body device and gear pump. BACKGROUND

[0002] Gear pump is a kind of rotary pump that relies on the change and movement of working volume formed between pump cylinder and meshing gear to transport liquid or pressurize it. When the gear rotates, the volume of space on the gear disengagement side changes from small to large, forming a vacuum to suck liquid in, and the volume of space on the gear meshing side changes from large to small to squeeze liquid out. The suction chamber and the discharge chamber are separated by the meshing line of the two gears, and the pressure of the gear pump outlet depends entirely on the resistance at the pump outlet.

[0003] In the prior art, the gear meshing side is communicated with an output channel, and the output channel is used to output liquid. In order to facilitate the pressure relief of the pipeline, a pressure relief valve is also installed in the output channel. However, it is found in production that when the liquid is grease, especially when the grease contains gypsum material, the viscosity and damping of the grease are large, and when the pump stops, it is difficult for the grease to flow back to the oil tank through the gap of the gear. Therefore, the pressure difference between the two ends of the pressure relief valve is very small (almost equal), so the pressure relief valve cannot always switch to the open state, which leads to the fact that the equipment cannot be relieved, directly affecting the normal use of the pump. Therefore, there is an urgent need for a gear pump body device and gear pump that can normally relieve pressure when pumping objects are viscous liquids to overcome the above-mentioned defects. SUMMARY

[0004] The purpose of the present application is to provide a gear pump body device that can normally relieve pressure when pumping objects are viscous liquids.

[0005] Another purpose of the present application is to provide a gear pump that can normally relieve pressure when pumping objects are viscous liquids.

[0006] To achieve the above object, the gear pump body device is used for pumping viscous liquid, especially for liquid added with thickening agent, comprising a gear pump head, a hanger seat and a pressure relief valve, the gear pump head is installed at the lower end of the hanger seat, the hanger seat is provided with an output channel, the pressure relief valve is installed on the hanger seat, the pressure relief valve divides the output channel into two parts, including a first channel and a second channel, the gear pump head comprises a pump seat and a gear pair installed in the pump seat, the pump seat has a liquid inlet side in contact / close to the liquid, the pump seat is provided with a liquid inlet opening on the liquid inlet side, the disengagement side of the gear pair is communicated with the liquid inlet opening, the pump seat is provided with an oil discharge flow channel, one end of the oil discharge flow channel is communicated with the first channel, the other end of the oil discharge flow channel is communicated with the meshing side of the gear pair, the pump seat is provided with a micropore communicated with the oil discharge flow channel and opened on the liquid inlet side, the pressure relief valve is pushed by the liquid when the gear pair operates to pump the liquid, and is in a closed state, so that the first channel and the second channel are communicated, when the gear pair stops operating, the first channel and the second channel establish a pressure difference to switch the pressure relief valve from the closed state to the open state, and thereby cut off the communication between the first channel and the second channel, the liquid remaining in the second channel is discharged outward through the opened pressure relief valve.

[0007] Preferably, the liquid inlet side of the pump seat is arranged on the bottom side of the pump seat.

[0008] Preferably, the pump seat comprises an upper piece, an intermediate piece and a lower piece, the upper piece, the intermediate piece and the lower piece are stacked from top to bottom and fixed, and the gear pair is installed in the intermediate piece.

[0009] Preferably, the pump seat further comprises a filter screen, the bottom of the lower piece extends downward to form a connecting ring, the filter screen is installed on the connecting ring and arranged in a filtering space surrounded by the connecting ring, the filter screen seals the filtering space, the filter screen is arranged below the liquid inlet side and spaced apart from the liquid inlet side.

[0010] Preferably, the filter screen is installed on the connecting ring by a clamp.

[0011] Preferably, the micropore is arranged on the lower piece, the micropore is a through hole structure arranged vertically / inclined and penetrating the top surface and the bottom surface of the lower piece, and the liquid inlet opening is arranged on the lower piece, the liquid inlet opening is a through hole structure arranged vertically / inclined and penetrating the top surface and the bottom surface of the lower piece.

[0012] Preferably, the hanger seat further has a mounting cavity, a pressure relief valve is mounted in the mounting cavity, the pressure relief valve comprises a pressure relief connector, a spring and a valve plug, the mounting cavity is located between the first channel and the second channel and is connected with the first channel and the second channel respectively, the pressure relief connector is fixedly mounted in the mounting cavity, the valve plug is axially slidably mounted in the mounting cavity, the spring is arranged between the pressure relief connector and the valve plug, the spring always has a tendency to drive the valve plug away from the pressure relief connector, the pressure relief connector has a pressure relief channel, one end of the pressure relief channel is open to the mounting cavity and the other end is open to the outside, the valve plug is pushed against the pressure relief connector when the pressure relief valve is in a closed state, the communication between the pressure relief channel and the mounting channel is cut off, and the valve plug is contracted so that a gap is formed between the outer periphery of the valve plug and the inner wall of the mounting cavity, allowing the first channel and the second channel to be connected, the valve plug is pushed away from the pressure relief connector by the spring when the pressure relief valve is in an open state, allowing the mounting cavity and the pressure relief channel to be connected, and the valve plug is expanded so that the outer periphery of the valve plug is tightly attached to the inner wall of the mounting cavity, cutting off the communication between the first channel and the second channel.

[0013] Preferably, one end of the valve plug has an umbrella-shaped skirt and a plug structure, the umbrella-shaped skirt is arranged around the plug structure, the umbrella-shaped skirt is folded when the valve plug is contracted and is close to the plug structure, the umbrella-shaped skirt is expanded when the valve plug is expanded and is away from the plug structure, and the valve plug is pressed against the pressure relief connector by the plug structure, thereby cutting off the communication between the pressure relief channel and the mounting cavity.

[0014] Preferably, the mounting cavity is reduced in diameter at the portion adjacent to the first channel to form a sliding space, the valve plug is axially slidably inserted into the sliding space, and the spring is sleeved on the pressure relief connector and the plug structure respectively.

[0015] To achieve the second object, the application further provides a gear pump, which comprises an electric drive module, a support seat, a transmission shaft, an oil tank and the gear pump body device. The upper end of the hanger seat is mounted on the support seat, the electric drive module is mounted on the support seat and located above the support seat, the transmission shaft is arranged in the hanger seat, one end of the transmission shaft is connected with the output end of the electric drive module, the other end of the transmission shaft is connected with the input end of the gear pair, the oil tank is mounted on the support seat and located below the support seat, and the gear pump body device is arranged in the oil tank.

[0016] Compared with existing technologies, the gear pump device provided by this invention leaves grease in the first and second channels when the gear pair stops operating. Due to the grease's high viscosity, it is difficult for it to flow back through the gear pair gaps to the inlet and ultimately back into the oil tank. Even if it does eventually flow back, the process is time-consuming. This invention addresses this by creating micro-holes in the pump base, connected to the oil discharge channel. Grease in the second channel can be discharged through these micro-holes, allowing it to flow back with minimal or no path travel. This causes a rapid pressure drop in the second channel, enabling the first and second channels to establish a pressure difference and allowing the pressure relief valve to switch from closed to open. Therefore, during shutdown, most of the grease in the second channel is discharged through the micro-holes, ensuring proper pressure relief as the pressure relief valve switches normally from closed to open. Attached Figure Description

[0017] Figure 1 This is a perspective view of the gear pump of the present invention with the oil tank concealed.

[0018] Figure 2 yes Figure 1 The front view of the gear pump is shown.

[0019] Figure 3 This is a perspective view of the gear pump of the present invention after concealing the electric drive module, support base, and oil tank.

[0020] Figure 4 yes Figure 3 The structure shown is a three-dimensional view when viewed from another angle.

[0021] Figure 5 yes Figure 4 The structure shown is a three-dimensional view after separation from the filter and clamps.

[0022] Figure 6 yes Figure 3 The structure shown is a perspective view after separation from the gear pump head and drive shaft.

[0023] Figure 7 yes Figure 3 The structure shown further conceals the hanging bracket, pressure relief valve, and the 3D view after the film is mounted.

[0024] Figure 8 yes Figure 3 Side view of the structure shown.

[0025] Figure 9 yes Figure 8 The structure shown along Figure 8 The cross-sectional view obtained after cutting along line CC shows the pressure relief valve in the open position.

[0026] Figure 10 yesFigure 9 An enlarged schematic diagram of the structure at point K, where the pressure relief valve is in the closed state.

[0027] Figure 11 This is an exploded perspective view of the pressure relief valve of the present invention.

[0028] Figure 12 This is a perspective view of the gear pump head of the present invention when the lower part is shown in perspective. Detailed Implementation

[0029] To illustrate the technical content and structural features of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] This invention discloses a gear pump body device 100 for pumping viscous liquids, such as grease. More specifically, the grease can be grease with added thickeners such as gypsum, but is not limited thereto. Grease has high viscosity due to its particulate matter content, which also makes it difficult for it to pass through small gaps and the gaps in the gear pair to flow back into the oil tank. This invention is described using grease as the pumping object, but it should be understood that the pumping object is not limited to grease, and can also be other liquids (especially liquids with considerable viscosity).

[0031] like Figures 3 to 10As shown, the gear pump body device 100 of the present invention includes a gear pump head 10, a mounting base 20, and a pressure relief valve 30. The gear pump head 10 is installed at the lower end of the mounting base 20, and the mounting base 20 has an output channel. The pressure relief valve 30 is installed on the mounting base 20 and divides the output channel into two parts, including a first channel 21 and a second channel 22. The gear pump head 10 includes a pump base 11 and a gear pair 12 installed in the pump base 11. The pump base 11 has an inlet side 111 that is in contact with or close to the liquid. The pump base 11 has an inlet port 112 that opens into the inlet side 111. The disengagement side A of the gear pair 12 communicates with the inlet port 112. The pump base 11 has an oil discharge channel 113, one end of which communicates with the first channel 21, and the other end of which communicates with the meshing side B of the gear pair 12. The oil drain channel 113 is a closed channel with openings at both ends. A micro-hole 114 is provided on the pump base 11, communicating with the oil drain channel 113 and opening onto the inlet side 111. When the gear pair 12 operates and pumps liquid, the pressure relief valve 30 is closed due to the liquid's push, connecting the first channel 21 and the second channel 22. Grease is drawn in from the inlet 112, then drawn to the disengagement side A, and subsequently pumped out from the meshing side B of the gear pair 12. The grease flows into the oil drain channel 113 and then into the first channel 21 and the second channel 22 for grease pumping. When the gear pair 12 stops operating, a pressure difference is established between the first channel 21 and the second channel 22, causing the pressure relief valve 30 to switch from the closed state to the open state, thereby cutting off the connection between the first channel 21 and the second channel 22. The liquid remaining in the second channel 22 is discharged through the open pressure relief valve 30.

[0032] When gear pair 12 stops operating, grease remains in the first channel 21 and the second channel 22. Due to the considerable viscosity of the grease, it is difficult for it to pass through the gap of the gear pair. Figure 12 The oil (through paths M and N) flows back to the inlet 112 and eventually back to the oil tank. Even if there is an opportunity for it to flow back, it takes a long time. This invention addresses this by creating micro-holes 114 in the pump base 11, which are connected to the oil discharge channel 113. The grease in the second channel 22 can be discharged through the micro-holes 114. Figure 12 When path P is closed, the grease flows back through paths M and N with minimal or no flow, causing the pressure in the second channel 22 to drop rapidly. This allows the pressure difference between the first channel 21 and the second channel 22 to be established smoothly, enabling the pressure relief valve 30 to switch from the closed state to the open state. Therefore, during shutdown, the micro-orifice 114 allows the first channel 21 and the second channel 22 to establish a pressure difference smoothly, allowing the pressure relief valve 30 to switch normally from the closed state to the open state. The grease in the second channel 22 is then discharged through the pressure relief valve 30, ensuring normal pressure relief.

[0033] It's worth noting that "micro-orifice 114" refers to a through-hole with a small diameter, ranging from approximately 0.1 to 3 mm. The diameter varies depending on the equipment, but the micro-orifice 114 should not be made too large to avoid a significant portion of the grease flowing out through an excessively large diameter during normal pressure pumping. Furthermore, because the micro-orifice 114 has a small diameter, the amount of grease flowing out during normal pressure pumping is minimal and will not affect normal oil pumping.

[0034] like Figures 3 to 9 As shown, the inlet side 111 of the pump base 11 is located on the bottom side of the pump base 11 so that the inlet port 112 is closer to the liquid surface of the grease, making it easier to suck up the grease.

[0035] like Figures 1 to 12 As shown, the pump base 11 includes an upper plate 115, an intermediate plate 116, and a lower plate 117. The upper plate 115, the intermediate plate 116, and the lower plate 117 are stacked and fixed from top to bottom, and a gear pair 12 is mounted on the intermediate plate 116. The structure of the gear pair 12 is well known to those skilled in the art, and includes a pair of meshing gears.

[0036] like Figure 4 and Figure 5 As shown, the pump base 11 also includes a filter screen 118. A connecting ring 1171 extends downwards from the bottom periphery of the lower plate 117. The filter screen 118 is installed in the connecting ring 1171 and located within the filtration space 1172 enclosed by the connecting ring 1171, sealing the filtration space 1172. The filter screen 118 is positioned below the liquid inlet side 111, spaced apart from it. The filter screen 118 filters the incoming grease, preventing impurities from flowing into the liquid inlet 112. To facilitate fixing the filter screen 118, it is installed in the connecting ring 1171 using a clamp 119.

[0037] like Figure 5 , Figure 7 and Figure 12 As shown, micropores 114 are formed in the lower plate 117. In the embodiment provided by the present invention, the micropores 114 are vertically arranged through-hole structures that penetrate the top and bottom surfaces of the lower plate 117. However, depending on actual needs, the micropores 114 can also be designed to be arranged at an angle. In addition, a liquid inlet 112 is formed in the lower plate 117. The liquid inlet 112 is a vertically arranged through-hole structure that penetrates the top and bottom surfaces of the lower plate 117 to facilitate the absorption of grease. However, depending on actual needs, the liquid inlet 112 can also be designed to be arranged at an angle.

[0038] like Figures 3 to 6 , Figure 8 , Figure 9 and Figure 10As shown, the mounting bracket 20 also has a mounting cavity 23. A pressure relief valve 30 is installed in the mounting cavity 23. The pressure relief valve 30 includes a pressure relief connector 31, a spring 32, and a valve plug 33. The mounting cavity 23 is located between the first channel 21 and the second channel 22, and is connected to both channels respectively. The pressure relief connector 31 is fixedly installed in the mounting cavity 23, and the valve plug 33 is axially slidable in the mounting cavity 23. The spring 32 is located between the pressure relief connector 31 and the valve plug 33, and the spring 32 always has a tendency to drive the valve plug 33 away from the pressure relief connector 31. The pressure relief connector 31 has a pressure relief channel 311, one end of which opens into the mounting cavity 23, while the other end opens to the outside, referring to the exposed side of the pressure relief connector 31. When the pressure relief valve 30 is closed, the valve plug 33 is pushed against the pressure relief connector 31, cutting off the connection between the pressure relief channel 311 and the mounting cavity 23. Grease cannot flow out of the pressure relief channel 311, and the valve plug 33 contracts, creating a gap between its outer circumference and the inner wall of the mounting cavity 23, connecting the first channel 21 and the second channel 22. Grease in the first channel 21 flows into the second channel 22 and is finally ejected. The state at this time is as follows: Figure 10 As shown.

[0039] When the pressure relief valve 30 is in the open state, the valve plug 33 is pushed away from the pressure relief connector 31 by the spring 32, connecting the mounting cavity 23 with the pressure relief channel 311. The valve plug 33 unfolds so that its outer circumference is pressed tightly against the inner wall of the mounting cavity 23, cutting off the connection between the first channel 21 and the second channel 22. Grease in the second channel 22 can only flow into the pressure relief channel 311, achieving pressure relief and backflow. The state at this time is as follows: Figure 9 As shown.

[0040] like Figure 9 , Figure 10 and Figure 11 As shown, one end of the valve plug 33 has an umbrella-shaped skirt 331 and a plug structure 332. The umbrella-shaped skirt 331 is arranged to surround the plug structure 332. When the valve plug 33 contracts, the umbrella-shaped skirt 331 closes and approaches the plug structure 332. When the valve plug 33 expands, the umbrella-shaped skirt 331 moves away from the plug structure 332. The valve plug 33 is pressed against the pressure relief connector 31 by the plug structure 332, thereby cutting off the communication between the pressure relief channel 311 and the mounting cavity 23.

[0041] The mounting cavity 23 is narrowed in diameter at the location adjacent to the first channel 21, forming a sliding space 231. The valve plug 33 is axially slidable into the sliding space 231. To enhance the installation stability of the spring 32, the spring 32 is respectively fitted onto the pressure relief connector 31 and the plug structure 332.

[0042] like Figure 1 and Figure 2As shown, the present invention also provides a gear pump 1000, which includes an electric drive module 200, a support base 300, a drive shaft 400, an oil tank (not shown), and the gear pump body device 100 described above.

[0043] The upper end of the hanger 20 is mounted on the support base 300. The electric drive module 200 is mounted on the support base 300 and located above it. The drive shaft 400 passes through the hanger 20. One end of the drive shaft 400 is connected to the output end of the electric drive module 200, and the other end is connected to the input end of the gear pair 12. The oil tank is mounted on the support base 300 and located below it. The gear pump body 100 is located in the oil tank.

[0044] The following is a brief description of the operation of the gear pump 1000 of the present invention, using grease as the pumping object for explanation. However, it should be understood that the pumping object is not limited to grease, but can also be other relatively viscous liquids.

[0045] Grease is stored in the oil tank. The electric drive module 200 drives the drive shaft 400 to rotate, which in turn drives the gear pair 12. The space on the disengagement side A of the gear pair 12 increases, and the grease is drawn into the inlet 112. Then the grease is forced out to the engagement side B. The grease then flows through the drain channel 113 and the first channel 21. At this time, the first channel 21 is pressurized, causing the umbrella-shaped skirt 331 of the valve plug 33 to contract and push the valve plug 33 to slide closer to the pressure relief connector 31. The plug 312 presses against the pressure relief connector 31, cutting off the connection between the mounting cavity 23 and the pressure relief channel 311. The grease flows through the mounting cavity 23 and then into the second channel 22, pumping the grease out. The state is as follows. Figure 10 As shown. When the electric drive module 200 is powered off (shut down), the gear pair 12 stops operating, and the grease in the first channel 21 flows out through the micro-hole 114 and returns to the oil tank. When the grease in the first channel 21 flows out to a certain amount, a pressure difference is established between the second channel 22 and the first channel 21. The spring 32 pushes the valve plug 33 to slide away from the pressure relief connector 31, and the umbrella-shaped skirt 331 of the valve plug 33 opens, cutting off the connection between the second channel 22 and the first channel 21. The mounting cavity 23 is connected to the pressure relief channel 311, and the grease in the second channel 22 flows to the pressure relief channel 311 and finally flows out and returns to the oil tank, as shown. Figure 9 As shown.

[0046] Figure 1 , Figure 3 In the diagram, arrow X points from left to right, arrow Y points from front to back, and arrow Z points from top to bottom.

[0047] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are within the scope of the present invention.

Claims

1. A gear pump body arrangement for pumping viscous liquids, particularly liquids to which a viscosifier has been added, characterised in that, The gear pump head is installed at the lower end of the hanger seat, the hanger seat is internally provided with an output channel, and the pressure relief valve is installed on the hanger seat and divides the output channel into two parts, i.e., a first channel and a second channel. The gear pump head comprises a pump seat and a gear pair installed in the pump seat. The pump seat has a liquid inlet side in contact with liquid. The pump seat is provided with a liquid inlet opening on the liquid inlet side. The disengagement side of the gear pair is in communication with the liquid inlet opening. The pump seat is internally provided with an oil discharge flow channel. One end of the oil discharge flow channel is in communication with the first channel, and the other end of the oil discharge flow channel is in communication with the meshing side of the gear pair. The pump seat is provided with a micro-hole in communication with the oil discharge flow channel and opening on the liquid inlet side. When the gear pair operates to pump liquid, the pressure relief valve is pushed by the liquid and is in a closed state, so that the first channel and the second channel are in communication. When the gear pair stops operating, the pressure relief valve is switched from the closed state to an open state due to the pressure difference between the first channel and the second channel, thereby cutting off the communication between the first channel and the second channel. The liquid remaining in the second channel is discharged outward through the opened pressure relief valve.

2. The gear pump body apparatus of claim 1, wherein, The liquid inlet side of the pump seat is arranged on the bottom side of the pump seat.

3. The gear pump body apparatus of claim 1, wherein, The pump seat comprises an upper piece, an intermediate piece and a lower piece. The upper piece, the intermediate piece and the lower piece are stacked from top to bottom and fixed. The gear pair is installed on the intermediate piece.

4. The gear pump body apparatus of claim 3, wherein, The pump seat further comprises a filter screen. The bottom of the lower piece extends downward to form a connecting ring. The filter screen is installed on the connecting ring and arranged in a filtering space surrounded by the connecting ring. The filter screen seals the filtering space. The filter screen is arranged below the liquid inlet side and spaced apart from the liquid inlet side.

5. The gear pump body apparatus of claim 4, wherein, The filter screen is installed on the connecting ring by a clamp.

6. The gear pump body apparatus of claim 3, wherein, The micro-hole is arranged on the lower piece and is a through-hole structure vertically / inclinedly arranged and penetrating the top surface and the bottom surface of the lower piece. The liquid inlet opening is arranged on the lower piece and is a through-hole structure vertically / inclinedly arranged and penetrating the top surface and the bottom surface of the lower piece.

7. The gear pump body apparatus of claim 1, wherein, The installation cavity is located between and connected with the first channel and the second channel, the pressure relief joint is fixedly installed in the installation cavity, the valve plug is axially slidably installed in the installation cavity, the spring is arranged between the pressure relief joint and the valve plug, the spring always has a tendency to drive the valve plug away from the pressure relief joint, the pressure relief joint has a pressure relief channel, one end of the pressure relief channel is open to the installation cavity and the other end is open to the outside, the valve plug is pushed against the pressure relief joint to cut off the communication between the pressure relief channel and the installation channel when the pressure relief valve is in the closed state, and the valve plug is contracted to form a gap between its outer periphery and the inner wall of the installation cavity, so that the first channel and the second channel are in communication, the valve plug is pushed away from the pressure relief joint by the spring to make the installation cavity communicate with the pressure relief channel when the pressure relief valve is in the open state, and the valve plug is expanded to tightly contact the inner wall of the installation cavity, cutting off the communication between the first channel and the second channel.

8. The gear pump body apparatus of claim 7, wherein, One end of the valve plug has an umbrella-shaped skirt and a plug structure, the umbrella-shaped skirt is arranged around the plug structure, the umbrella-shaped skirt is folded close to the plug structure when the valve plug is contracted, the umbrella-shaped skirt is expanded away from the plug structure when the valve plug is expanded, and the valve plug is pressed against the pressure relief joint by the plug structure, thereby cutting off the communication between the pressure relief channel and the installation cavity.

9. The gear pump body apparatus of claim 8, wherein, The installation cavity is arranged with a reduced diameter adjacent to the first channel to form a sliding space, the valve plug is axially slidably inserted into the sliding space, and the spring is sleeved on the pressure relief joint and the plug structure.

10. A gear pump characterized by, The gear pump body device comprises an electric drive module, a support seat, a transmission shaft, an oil tank and the gear pump body device according to any one of claims 1-9, the upper end of the hanging seat is installed on the support seat, the electric drive module is installed on and above the support seat, the transmission shaft is arranged in the hanging seat, one end of the transmission shaft is connected with the output end of the electric drive module, the other end of the transmission shaft is connected with the input end of the gear pair, the oil tank is installed on and below the support seat, and the gear pump body device is arranged in the oil tank.

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