Gear pump body mechanism and gear pump

Abstract

The gear pump body mechanism and the gear pump can normally release pressure even if the pumping object is a liquid with high viscosity. The gear pump body mechanism comprises a gear pump head, a hanger seat, a pressure release valve and an exhaust valve. The gear pump head is installed at the lower end of the hanger seat. The hanger seat is internally provided with an output channel. The pressure release valve is installed on the hanger seat. The pressure release valve divides the output channel into two parts, including a first channel and a second channel. The output port of the gear pump head is in communication with the first channel. The exhaust valve is installed on the hanger seat. The exhaust valve is internally provided with an exhaust cavity and an exhaust channel. The exhaust valve is provided with a micropore in communication with the exhaust cavity. When the exhaust valve is in a first state, the exhaust channel is disconnected from the exhaust cavity, and the exhaust cavity is in communication with the first channel. When the exhaust valve is in a second state, the exhaust channel is in communication with the exhaust cavity, and the exhaust cavity is disconnected from the first channel.

Description

Technical Field

[0001] This invention relates to the field of gear pumps, and more particularly to gear pump mechanisms and gear pumps. Background Technology

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport or pressurize liquids. When the gears rotate, the volume of the space on the disengaged side of the gears increases from small to large, forming a vacuum that draws in the liquid. The space on the meshing side of the gears decreases from large to small, squeezing out the liquid. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure at the outlet of the gear pump depends entirely on the resistance at the pump outlet.

[0003] In existing technology, the gear meshing side is connected to an output channel, which is used to output liquid. A pressure relief valve is also installed in the output channel to facilitate pressure relief. However, it has been found in production that when the liquid is grease, especially when the grease contains thickeners such as gypsum, the grease has high viscosity and high damping. When the pump stops, the grease has difficulty flowing back to the oil tank through the gear gap. Therefore, the pressure difference across the pressure relief valve is very small (almost equal), so the pressure relief valve cannot be switched to the open state, resulting in the equipment being unable to relieve pressure and directly affecting the normal operation of the pump. Therefore, there is an urgent need for a gear pump body device and gear pump that can also properly relieve pressure when pumping highly viscous liquids to overcome the above-mentioned defects. Summary of the Invention

[0004] The purpose of this invention is to provide a gear pump body mechanism that can normally release pressure when the pumped object is a highly viscous liquid.

[0005] Another objective of this invention is to provide a gear pump that can normally release pressure when pumping a highly viscous liquid.

[0006] To achieve the above objectives, the gear pump mechanism provided by this invention is used for pumping viscous liquids, particularly suitable for liquids with added thickeners. It is characterized by comprising a gear pump head, a mounting base, a pressure relief valve, and an exhaust valve. The gear pump head is mounted on the lower end of the mounting base, which has an output channel. The pressure relief valve is mounted on the mounting base and divides the output channel into two parts: a first channel and a second channel. The output port of the gear pump head communicates with the first channel. The exhaust valve is mounted on the mounting base and has an exhaust chamber and an exhaust channel. The exhaust valve has a micro-hole communicating with the exhaust chamber. When the exhaust valve is in a first state, the exhaust channel is disconnected from the exhaust chamber, and the exhaust chamber is connected to the first channel. When the exhaust valve is in a second state… The exhaust channel is connected to the exhaust chamber. When the gear pump head is running and pumping liquid into the first channel, the exhaust valve is pushed by the liquid and is in the first state. The liquid in the first channel flows into the exhaust chamber. When the gear pump head is running and pumping liquid into the first channel, the pressure relief valve is pushed by the liquid and is in the closed state, so that the first channel is connected to the second channel. When the gear pump head stops running, some of the liquid in the exhaust chamber is discharged through the micro-hole, causing the pressure in the first channel to drop. The pressure difference between the first channel and the second channel is established, causing the pressure relief valve to switch from the closed state to the open state, thereby cutting off the connection between the first channel and the second channel. The liquid remaining in the second channel is discharged outward through the open pressure relief valve. The exhaust valve finally switches from the first state to the second state.

[0007] Preferably, the exhaust valve includes a valve body, an exhaust connector, and a plug. The valve body has an exhaust chamber, the exhaust connector is installed in the exhaust chamber, the exhaust connector has an exhaust channel, one end of the exhaust channel opens into the exhaust chamber, and the other end of the exhaust channel opens outward. The plug is axially slidably disposed in the exhaust chamber. When the first channel is pressed up, the plug is pushed by the liquid against the exhaust connector, cutting off the connection between the exhaust chamber and the exhaust channel, and the exhaust valve is in the first state. When the first channel is pressed down, the plug is pushed away from the exhaust connector and slides away from the exhaust connector, the exhaust chamber and the exhaust channel are connected, and the exhaust valve is in the second state.

[0008] Preferably, the exhaust valve also includes an exhaust spring and a coupling. The exhaust spring is located between the exhaust coupling and the plug body. The exhaust spring always has the tendency to drive the plug body away from the exhaust coupling. The plug body is aligned with one end of the exhaust channel opening. The coupling is installed in the exhaust chamber. The coupling and the exhaust coupling are respectively located on both sides of the plug body. The coupling has a docking channel. One end of the docking channel is connected to the first channel. The other end of the docking channel opens into the exhaust chamber, and the plug body is aligned with the docking channel. A connecting notch is provided on the end of the coupling head near the plug body to connect the docking channel with the exhaust chamber.

[0009] Preferably, an oil passage gap is formed between the exhaust connector and the valve body, through which liquid can flow, and the micropores are connected to the exhaust chamber through the oil passage gap.

[0010] Preferably, the micropore is formed on the side of the exhaust valve, and one end of the exhaust connector forms an end structure exposed in the valve body. A notch is provided on the outer side wall of the valve body near one end of the end structure, and the end structure surrounds the micropore at one end of the valve body.

[0011] Preferably, the outer wall of the exhaust connector has a connecting structure that extends into the exhaust chamber. The connecting structure is detachably connected to the valve body, and an oil passage gap is formed between the connecting structure and the wall of the exhaust chamber.

[0012] Preferably, the gear pump head includes a pump base and a gear pair installed in the pump base. The pump base has an inlet side that is in contact with / close to the liquid. The pump base has an inlet port that opens into the inlet side. The disengagement side of the gear pair is connected to the inlet port. The pump base has an oil discharge channel. One end of the oil discharge channel is connected to the meshing side of the gear pair, and the other end of the oil discharge channel is connected to the first channel.

[0013] Preferably, a connecting ring is formed by extending downward from the bottom periphery of the pump base, and a filter screen is installed on the connecting ring and located in the filtration space enclosed by the connecting ring. The filter screen seals the filtration space and is located below the liquid inlet side, with the filter screen spaced apart from the liquid inlet side.

[0014] Preferably, the mounting bracket has a first mounting cavity and a second mounting cavity. The first mounting cavity is located between the first channel and the second channel and is connected to both channels. The second mounting cavity is connected to the first channel. A pressure relief valve is installed in the first mounting cavity, and an exhaust valve is installed in the second mounting cavity. The pressure relief valve includes a pressure relief connector, a pressure relief spring, and a valve plug. The pressure relief connector is fixedly installed in the first mounting cavity, and the valve plug is axially slidable in the first mounting cavity. The pressure relief spring is located between the pressure relief connector and the valve plug, and 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 opens into the first mounting cavity, while the other end opens outwards. When the pressure relief valve is closed, the valve plug is pushed against the pressure relief connector, cutting off the connection between the pressure relief channel and the first mounting cavity. The valve plug also contracts, creating a drainage gap between its outer circumference and the inner wall of the first mounting cavity, allowing liquid to flow through and connecting the first channel to the second channel. When the pressure relief valve is open, the valve plug is pushed away from the pressure relief connector by the pressure relief spring, connecting the first mounting cavity to the pressure relief channel. The valve plug also expands, pressing its outer circumference tightly against the inner wall of the first mounting cavity, cutting off the connection between the first and second channels.

[0015] To achieve the second objective mentioned above, the present invention also provides a gear pump, including an electric drive module, a support base, a drive shaft, an oil tank, and the aforementioned gear pump body mechanism. The upper end of the hanger is mounted on the support base, the electric drive module is mounted on the support base and located above the support base, the drive shaft passes through the hanger, one end of the drive shaft is connected to the output end of the electric drive module, and the other end of the drive shaft is connected to the input end of the gear pump head. The oil tank is mounted on the support base and located below the support base, and the gear pump body mechanism is located in the oil tank.

[0016] Compared to existing technologies, in the gear pump body mechanism of this invention, when the gear pump head stops operating, grease remains in the first and second channels. Due to the considerable viscosity of the grease, it is difficult for it to flow back through the gaps in the gear pair. This invention addresses this by creating micro-holes in the exhaust valve, which are connected to the exhaust chamber. When the machine stops, the grease in the exhaust chamber can be discharged through these micro-holes. Since the exhaust valve is in its first state at the moment of shutdown, and the exhaust chamber is connected to the first channel, the pressure in the first channel decreases after grease is discharged through the micro-holes. This allows a pressure difference to be smoothly established between the second and first channels, enabling the pressure relief valve to switch from a closed to an open state. Therefore, when the machine stops, the micro-holes allow a pressure difference to be smoothly established between the first and second channels, allowing the pressure relief valve to normally switch from a closed to an open state. The grease in the second channel is then discharged through the pressure relief valve, ensuring normal pressure relief. 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 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 is a 3D view of the upper part of the hidden pump base after concealing the hanging bracket, pressure relief valve, and exhaust valve.

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

[0025] Figure 9 yes Figure 8 The structure shown is a cross-sectional view obtained by cutting along line CC, with the pressure relief valve in the open position.

[0026] Figure 10 yes Figure 9 The diagram shows the structure at point K, where the pressure relief valve is closed.

[0027] Figure 11 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 plate of the pump base is transparently displayed.

[0029] Figure 13 yes Figure 3 The rear view of the structure shown.

[0030] Figure 14 yes Figure 13 The structure shown along Figure 13 The cross-sectional view obtained after cutting the DD line segment shows the exhaust valve in its second state.

[0031] Figure 15 yes Figure 14 The structural diagram of the section at point R shows the exhaust valve in its first state.

[0032] Figure 16 This is a perspective view of the exhaust valve of the present invention.

[0033] Figure 17 This is an exploded perspective view of the exhaust valve of the present invention. Detailed Implementation

[0034] 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.

[0035] This invention discloses a gear pump body mechanism for pumping viscous liquids, such as grease. More specifically, the grease may be grease with added thickeners such as gypsum, but is not limited thereto. Due to the presence of particulate matter, the grease has high viscosity and is difficult to flow back into the oil tank through the gaps in the gear pair. 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).

[0036] like Figures 3 to 16As shown, the gear pump body mechanism 100 provided by the present invention is used for pumping viscous liquids, especially suitable for liquids with added thickeners. It includes a gear pump head 10, a mounting base 20, a pressure relief valve 30, and an exhaust valve 40. The gear pump head 10 is installed at the lower end of the mounting base 20, which 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 output port of the gear pump head 10 communicates with the first channel 21, and the gear pump head 10 inputs the pumped grease into the first channel 21. The exhaust valve 40 is installed on the mounting base 20 and has an exhaust chamber 41 and an exhaust channel 42. The exhaust valve 40 has a microhole 43 communicating with the exhaust chamber 41. The exhaust valve 40 has at least two working states, including a first state (…). Figure 15 (as shown) and the second state ( Figure 14 (As shown). When the exhaust valve 40 is in the first state, as... Figure 15 As shown, the exhaust passage 42 is disconnected from the exhaust chamber 41, and the exhaust chamber 41 is connected to the first passage 21. When the exhaust valve 40 is in the second state, as... Figure 14 As shown, the exhaust passage 42 is connected to the exhaust chamber 41.

[0037] When the gear pump head 10 is running and pumping liquid into the first channel 21, the exhaust valve 40 is pushed by the liquid and is in the first state. The liquid in the first channel 21 flows into the exhaust chamber 41. When the gear pump head 10 is running and pumping liquid into the first channel 21, the pressure relief valve 30 is pushed by the liquid and is in the closed state, so that the first channel 21 is connected to the second channel 22. The liquid in the first channel 21 flows into the second channel 22 for pumping oil.

[0038] When the gear pump head 10 stops operating, some of the liquid in the exhaust chamber 41 is discharged through the micropore 43, causing a pressure drop in the first channel 21. 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, achieving pressure relief during shutdown. The exhaust valve 40 switches from the first state to the second state.

[0039] When the gear pump head 10 stops operating, grease remains on 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 gaps in the gear pair. Figure 12 The grease in the exhaust chamber 41 can be discharged through the micro-holes 43 by opening a micro-hole 43 in the exhaust valve 40, which is connected to the exhaust chamber 41. When the machine is stopped (when the gear pump head 10 stops running), the grease in the exhaust chamber 41 can be discharged through the micro-holes 43. Figure 15In path F), at the moment of shutdown, exhaust valve 40 is in the first state, and exhaust chamber 41 is connected to the first channel 21. After grease is discharged from exhaust chamber 41 through micro-hole 43, the pressure in the first channel 21 will also decrease, allowing the second channel 22 and the first channel 21 to successfully establish a pressure difference, causing the pressure relief valve 30 to switch from the closed state to the open state. Therefore, at shutdown, the micro-hole 43 allows the first channel 21 and the second channel 22 to successfully establish a pressure difference, allowing the pressure relief valve 30 to normally switch from the closed state to the open state, and the grease in the second channel 22 to be discharged through the pressure relief valve 30, ensuring normal pressure relief.

[0040] It is worth noting that micro-orifice 43 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 micro-orifice 43 should not be made too large. This would prevent a significant portion of the grease from flowing out through an excessively large micro-orifice when the first channel 21 is pressurized and pumping grease. Because the diameter of micro-orifice 43 is small, the amount of grease flowing out of micro-orifice 43 during normal pressurization is very small and will not affect normal oil pumping.

[0041] like Figure 4 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, the exhaust valve 40 includes a valve body 44, an exhaust connector 45, and a plug 46. The valve body 44 has an exhaust chamber 41, the exhaust connector 45 is installed in the exhaust chamber 41, and the exhaust connector 45 has an exhaust channel 42. One end of the exhaust channel 42 opens into the exhaust chamber 41, and the other end opens outward. The plug 46 is axially slidably disposed in the exhaust chamber 41. When the first channel 21 is pressed, the plug 46 is pushed against the exhaust connector 45 by the liquid, cutting off the connection between the exhaust chamber 41 and the exhaust channel 42. The exhaust valve 40 is in the first state, and grease flows into the exhaust chamber 41. At this time, a small amount of grease in the exhaust chamber 41 can flow out through the micropores 43. When the first channel 21 is pressed down, the plug 46 is pushed away from the exhaust connector 45 and slides. The exhaust valve 40 is in the second state, at which time the grease in the first channel 21 will not flow into the exhaust chamber 41.

[0042] like Figure 4 , Figure 13 , Figure 14 , Figure 15 and Figure 16As shown, the exhaust valve 40 also includes an exhaust spring 47 and a coupling connector 48. The exhaust spring 47 is located between the exhaust connector 45 and the plug 46. The exhaust spring 47 has a constant tendency to drive the plug 46 away from the exhaust connector 45. The plug 46 is aligned with one end of the exhaust channel 42. The exhaust spring 47 is configured to allow the plug 46 to automatically reset when the machine stops. Further, the exhaust valve 40 also includes a coupling connector 48, which is installed in the exhaust chamber 41. The coupling connector 48 and the exhaust connector 45 are respectively located on both sides of the plug 46. The coupling connector 48 has a mating channel 481. One end of the mating channel 481 is connected to the first channel 21, and the other end of the mating channel 481 opens into the exhaust chamber 41, with the plug 46 aligned with the mating channel 481. A connecting notch 482 is provided on the coupling connector 48 near the plug 46, allowing the mating channel 481 to connect with the exhaust chamber 41. The connecting notch 482 ensures that the mating channel 481 remains connected. Even if the plug 46 presses against the connector 48, sealing one end of the mating channel 481, the connecting notch 482 maintains communication between the mating channel 481 and the exhaust chamber 41. It is worth noting that a small through-hole can also be provided in the connector 48 to maintain communication between the mating channel 481 and the exhaust chamber 41. This small through-hole serves the same function as the connecting notch 482.

[0043] like Figure 14 and Figure 15 As shown, an oil passage gap 49 is formed between the exhaust connector 45 and the valve body 44, allowing liquid to flow through. The micro-hole 43 is connected to the exhaust chamber 41 through the oil passage gap 49. The oil passage gap 49 allows grease in the exhaust chamber 41 to flow out, while effectively limiting the outflow of large amounts of grease, thus preventing insufficient pressure in the first channel 21. When the machine stops, after the grease in the exhaust chamber 41 flows out through the oil passage gap 49 and the micro-hole 43, the pressure in the first channel 21 will decrease after a period of time, allowing a pressure difference to be established between the second channel 22 and the first channel 21.

[0044] like Figure 14 , Figure 15 , Figure 16 and Figure 17 As shown, the micropore 43 is formed on the side of the exhaust valve 40. One end of the exhaust connector 45 forms an end structure 451 exposed in the valve body 44. A notch is provided on the outer side wall of the valve body 44 near the end of the end structure 451. The end structure 451 near the end of the valve body 44 surrounds the micropore 43.

[0045] The outer wall of the exhaust connector 45 forms a connecting structure 452, which extends into the exhaust chamber 41. The connecting structure 452 is detachably connected to the valve body 44, and an oil passage gap 49 is formed between the connecting structure 452 and the wall of the exhaust chamber 41. Preferably, the diameter of the connecting structure 452 is smaller than that of the end structure 451, but larger than that of other parts of the exhaust connector 45. The outer wall of the connecting structure 452 is provided with a threaded structure, which allows for detachable connection to the valve body 44. It is worth noting that the connection of the threaded structure here is not very tight, but allows grease to flow through.

[0046] like Figure 5 , Figure 7 , Figures 12 to 17 As shown, 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 / 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 is connected to the inlet port 112. The pump base 11 is provided with a drain channel 113. One end of the drain channel 113 is connected to the meshing side B of the gear pair 12, and the other end of the drain channel 113 is connected to the first channel 21.

[0047] During normal operation, gear pair 12 rotates, and gear pump head 10 is immersed in or very close to the grease. The grease is drawn in from the inlet 112, then pumped out to the drain channel 113, and then flows into the first channel 21. When the grease in the tank is insufficient, it needs to be replenished. Since the grease is poured into the tank all at once, air often remains between the grease surface and the inlet side 111, preventing the grease from contacting the inlet side 111. In the initial stage of equipment startup, the rotation of gear pair 12 does not immediately pump oil, but instead pumps out the aforementioned air. Only after the air is pumped out will the grease flow into the inlet 112 for normal pumping. At the instant gear pair 12 begins to operate, exhaust valve 40 is in its second state. At this time, exhaust passage 42 and exhaust chamber 41 are connected, while docking passage 481 is connected to exhaust chamber 41 via connecting notch 482. The pumped air first flows into first passage 21, then successively into docking passage 481, exhaust chamber 41, and exhaust passage 42, and finally exits, thus venting the air. After venting is completed, grease reaches inlet side 111, pressurizes first passage 21, and plug 46 is pushed open by grease. In this way, exhaust valve 40 switches to its first state, and pressure relief valve 30 switches to the closed state. This is the venting function of exhaust valve 40.

[0048] like Figures 2 to 14As shown, a connecting ring 114 extends downward from the bottom periphery of the pump base 11. A filter screen 13 is installed in the connecting ring 114 and located in the filtration space 115 enclosed by the connecting ring 114. The filter screen 13 seals the filtration space 115 and is located below the liquid inlet side 111, spaced apart from the liquid inlet side 111. More specifically, when adding grease to the oil tank, some air is located in the filtration space 115. After pumping out the air from the filtration space 115, the grease can pass through / approach the liquid inlet side 111, and then the grease can flow normally into the liquid inlet 112. Preferably, the filter screen 13 can be installed in the connecting ring 114 by means of a clamp 14.

[0049] like Figures 2 to 15 As shown, the mounting bracket 20 has a first mounting cavity 23 and a second mounting cavity 24. The first mounting cavity 23 is located between the first channel 21 and the second channel 22, and is connected to both the first channel 21 and the second channel 22. The second mounting cavity 24 is connected to the first channel 21. A pressure relief valve 30 is installed in the first mounting cavity 23, and an exhaust valve 40 is installed in the second mounting cavity 24. The pressure relief valve 30 includes a pressure relief connector 31, a pressure relief spring 32, and a valve plug 33. The pressure relief connector 31 is fixedly installed in the first mounting cavity 23, the valve plug 33 is axially slidable in the first mounting cavity 23, and the pressure relief spring 32 is located between the pressure relief connector 31 and the valve plug 33. The pressure relief 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 first mounting cavity 23, and the other end opens outward.

[0050] 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 first mounting cavity 23. The valve plug 33 also contracts, creating an oil drain gap (not shown) between its outer circumference and the inner wall of the first mounting cavity 23, allowing liquid to flow through. This connects the first channel 21 and the second channel 22. The state at this time is as follows: Figure 10 As shown. 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 pressure relief spring 32, so that the first mounting cavity 23 is connected to the pressure relief channel 311, and the second channel 22 is connected to the pressure relief channel 311. Grease in the second channel 22 is discharged from the pressure relief channel 311, realizing pressure relief. At the same time, the valve plug 33 unfolds so that its outer circumference is pressed against the inner wall of the first mounting cavity 23, cutting off the connection between the first channel 21 and the second channel 22. The state at this time is as follows. Figure 9 As shown.

[0051] 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 aforementioned gear pump body mechanism 100. The upper end of the hanger 20 is mounted on the support base 300, and the electric drive module 200 is mounted on the support base 300 and positioned above it. The drive shaft 400 passes through the hanger 20, with one end connected to the electric drive module 200 and the other end connected to the input end of the gear pump head 10. The oil tank is mounted on the support base 300 and located below it, and the gear pump body mechanism 100 is disposed within the oil tank.

[0052] The following is a brief description of the operation of the gear pump 1000 of the present invention: The pumping object is described using grease as an example, but it should be understood that the pumping object is not limited to grease; it can also be other relatively viscous liquids, especially liquids with added thickeners. 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 pushed out on 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 by the grease, and the exhaust valve 40 is in the first state, allowing the grease to flow into the exhaust chamber 41. The pressure relief valve 30 is in the closed state, connecting the first channel 21 and the second channel 22. The grease flows into the second channel 22, pumping the grease out, as shown in the description. Figure 10 , Figure 15 As shown.

[0053] When the electric drive module 200 is powered off (shutdown), the gear pair 12 stops operating. Grease remains in the first channel 21. The pressure of the grease causes the exhaust valve 40 to temporarily remain in the first state (or switch to the second state). Grease in the exhaust chamber 41 flows out through the micro-hole 43 via the oil gap 49. After a period of time, some of the grease in the first channel 21 flows into the exhaust chamber 41 (when the exhaust valve 40 switches to the second state, grease flows into the exhaust chamber 41 through the connecting notch 482). The pressure in the first channel 21 decreases, and a pressure difference is established between the second channel 22 and the first channel 21. The pressure relief valve 30 switches from the closed state to the open state, and the grease in the second channel 22 flows into the pressure relief channel 311, eventually flowing out and returning to the oil tank, thus achieving pressure relief. The state is as follows: Figure 9 , Figure 14 As shown.

[0054] It is worth noting that the pump base 11 includes an upper plate, a middle plate and a lower plate, the structure of which is well known to those skilled in the art.

[0055] Figure 1 , Figure 3In the diagram, arrow X points from left to right, arrow Y points from front to back, and arrow Z points from top to bottom.

[0056] 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 mechanism for pumping viscous liquids, characterized in that, The device includes a gear pump head, a mounting base, a pressure relief valve, and an exhaust valve. The gear pump head is mounted on the lower end of the mounting base, which has an output channel. The pressure relief valve is mounted on the mounting base and divides the output channel into two parts: a first channel and a second channel. The output port of the gear pump head communicates with the first channel. The exhaust valve is mounted on the mounting base and has an exhaust chamber and an exhaust channel. The exhaust valve has a micro-hole communicating with the exhaust chamber. When the exhaust valve is in a first state, the exhaust channel is disconnected from the exhaust chamber, and the exhaust chamber is connected to the first channel. When the exhaust valve is in the second state, the exhaust channel is connected to the exhaust chamber; when the gear pump head operates and pumps liquid into the first channel, the exhaust valve is pushed by the liquid and is in the first state, and the liquid in the first channel flows into the exhaust chamber; when the gear pump head operates and pumps liquid into the first channel, the pressure relief valve is pushed by the liquid and is in the closed state, so that the first channel is connected to the second channel; when the gear pump head stops operating, part of the liquid in the exhaust chamber is discharged through the micropores, causing the pressure in the first channel to drop, and a pressure difference is established between the first channel and the second channel. The pressure relief valve is switched from the closed state to the open state, thereby cutting off the connection between the first channel and the second channel. The liquid remaining in the second channel is discharged outward through the open pressure relief valve, and the vent valve finally switches from the first state to the second state. The vent valve includes a valve body, a vent connector, and a plug. The valve body has the vent chamber, the vent connector is installed in the vent chamber, the vent connector has the vent channel, one end of the vent channel opens into the vent chamber, and the other end of the vent channel opens outward. The plug is axially slidable in the vent chamber. When the body is pressed up in the first channel, it is pushed by the liquid against the exhaust connector, cutting off the connection between the exhaust chamber and the exhaust channel, and the exhaust valve is in the first state; when the plug is pressed down in the first channel, it is pushed away from the exhaust connector and slides, the exhaust chamber is connected to the exhaust channel, and the exhaust valve is in the second state; the micropore is opened on the side of the exhaust valve, one end of the exhaust connector forms an end structure exposed on the valve body, a notch is provided on the outer side wall of the valve body near one end of the end structure, and the end structure is close to one end of the valve body, surrounding the notch to form the micropore.

2. The gear pump body mechanism according to claim 1, characterized in that, The exhaust valve further includes an exhaust spring and a connector. The exhaust spring is located between the exhaust connector and the plug. The exhaust spring has a constant tendency to drive the plug away from the exhaust connector. The plug is aligned with one end of the exhaust channel. The connector is installed in the exhaust chamber. The connector and the exhaust connector are respectively located on both sides of the plug. The connector has a docking channel. One end of the docking channel communicates with the first channel. The other end of the docking channel opens into the exhaust chamber, and the plug is aligned with the docking channel. The end of the connector near the plug has a communication notch that connects the docking channel to the exhaust chamber.

3. The gear pump body mechanism according to claim 1, characterized in that, An oil passage gap is formed between the exhaust connector and the valve body, allowing liquid to flow through. The micropore is connected to the exhaust chamber through the oil passage gap.

4. The gear pump body mechanism according to claim 3, characterized in that, The outer wall of the exhaust connector has a connecting structure that extends into the exhaust chamber. The connecting structure is detachably connected to the valve body, and an oil passage gap is formed between the connecting structure and the wall of the exhaust chamber.

5. The gear pump body mechanism according to claim 1, characterized in that, The gear pump head includes a pump base and a gear pair installed in the pump base. The pump base has a liquid inlet side that is in contact with / close to the liquid. The pump base has an inlet port that opens into the liquid inlet side. The disengagement side of the gear pair is connected to the liquid inlet port. The pump base has an oil discharge channel. One end of the oil discharge channel is connected to the meshing side of the gear pair, and the other end of the oil discharge channel is connected to the first channel.

6. The gear pump body mechanism according to claim 5, characterized in that, A connecting ring is formed by extending downward from the bottom periphery of the pump base. A filter screen is installed on the connecting ring and located in the filtration space enclosed by the connecting ring. The filter screen seals the filtration space. The filter screen is located below the liquid inlet side and is spaced apart from the liquid inlet side.

7. The gear pump body mechanism according to claim 1, characterized in that, The mounting bracket has a first mounting cavity and a second mounting cavity. The first mounting cavity is located between the first channel and the second channel and is connected to both channels. The second mounting cavity is connected to the first channel. The pressure relief valve is installed in the first mounting cavity, and the exhaust valve is installed in the second mounting cavity. The pressure relief valve includes a pressure relief connector, a pressure relief spring, and a valve plug. The pressure relief connector is fixedly installed in the first mounting cavity, and the valve plug is axially slidable in the first mounting cavity. The pressure relief spring is located between the pressure relief connector and the valve plug, and the pressure relief 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 opens into the first mounting cavity, while the other end opens outward. When the pressure relief valve is in the closed state, the valve plug is pushed against the pressure relief connector, cutting off the communication between the pressure relief channel and the first mounting cavity. The valve plug also contracts, creating an oil drain gap between its outer circumference and the inner wall of the first mounting cavity, allowing liquid to flow through, thus connecting the first channel and the second channel. When the pressure relief valve is in the open state, the valve plug is pushed away from the pressure relief connector by the pressure relief spring, connecting the first mounting cavity and the pressure relief channel. The valve plug also unfolds, pressing its outer circumference tightly against the inner wall of the first mounting cavity, cutting off the communication between the first channel and the second channel.

8. A gear pump, characterized in that, The device includes an electric drive module, a support base, a drive shaft, an oil tank, and a gear pump body mechanism as described in any one of claims 1-7. The upper end of the hanger is mounted on the support base, the electric drive module is mounted on the support base and positioned above it, the drive shaft passes through the hanger, one end of the drive shaft is connected to the output end of the electric drive module, and the other end of the drive shaft is connected to the input end of the gear pump head. The oil tank is mounted on the support base and positioned below it, and the gear pump body mechanism is disposed within the oil tank.

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