An electronic oil pump with an internal circulation flow control structure

Abstract

This utility model relates to the field of fluid circulation system technology, specifically disclosing an electronic oil pump with an internal circulation flow control structure. The electronic oil pump includes a pump body with a cavity. The cavity is divided into an outer circulation cavity and an inner circulation cavity by a partition. The outer circulation cavity supplies oil to external oil-using equipment. The inner circulation cavity houses a motor and a controller, and the partition has an oil hole. The electronic oil pump also includes a one-way control unit located in the inner circulation cavity and connected to the partition. The one-way control unit covers the oil hole, enabling automatic adjustment of the oil flow channel opening based on oil pressure. The oil flow channel is the oil flow path formed by the oil hole and the one-way control unit. This solves the problem in the prior art where electronic oil pumps struggle to dynamically adjust the internal circulation flow according to actual operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of fluid circulation system technology, specifically to an electronic oil pump with an internal circulation flow control structure. Background Technology

[0002] During the operation of the electronic oil pump, the internal circulating oil effectively removes the Joule heat generated by the motor and the power loss heat of the motor controller, preventing overheating and failure of core components. Simultaneously, the oil forms a lubricating film between the motor shaft and the sliding bearing, reducing frictional losses and extending the lifespan of mechanical parts. The internal and external circulation systems are coupled through the pump body's flow channels; the greater the internal circulation flow rate, the smaller the effective flow rate through the external circulation outlet.

[0003] To address the low efficiency and high heat generation of electronic oil pumps under low-temperature conditions, the oil flow channel was enlarged. However, this enlarged flow channel can lead to low oil viscosity at high temperatures, and significant flow loss during external circulation (the path where oil is drawn in and then discharged to supply the oil-using equipment), further impacting pump efficiency. Furthermore, insufficient external circulation flow can cause severe overheating of the electric drive assembly. Currently, the internal circulation circuit of oil pumps typically employs a fixed flow channel design, with flow rate determined by pump body structural parameters (such as clearance dimensions and flow channel cross-sectional area), making dynamic adjustment impossible based on actual operating conditions. Under low load or low temperature conditions where high flow is not necessary, the internal circulation still operates at a fixed high flow rate, unnecessarily reducing the external circulation output flow and lowering the overall system oil delivery efficiency. This fixed flow design fails to balance lubrication and cooling requirements with energy consumption, potentially increasing oil circulation power consumption, causing heat dissipation failure due to insufficient flow under high load, or wasting energy due to excessive circulation under low load.

[0004] To address the current problem that electronic oil pumps cannot dynamically adjust the internal circulation flow rate according to actual working conditions, it is necessary to optimize and improve the circulation flow structure so that the internal circulation flow rate can be distributed on demand through the flow adjustment mechanism. This will ensure the lubrication and cooling effect while minimizing the impact on the external circulation performance and improving the overall system efficiency. Utility Model Content

[0005] The purpose of this invention is to provide an electronic oil pump with an internal circulation flow control structure to solve the problem that existing electronic oil pumps are difficult to dynamically adjust the internal circulation flow according to actual working conditions.

[0006] This utility model is achieved through the following technical solution:

[0007] An electronic oil pump with an internal circulation flow control structure includes a pump body, which has a cavity. The cavity is divided into an external circulation cavity and an internal circulation cavity by a partition. The external circulation cavity is used to supply oil to external oil-using equipment. The internal circulation cavity is equipped with a motor and a controller. The partition has an oil hole.

[0008] The electronic oil pump also includes a one-way control unit located in the inner circulation chamber and connected to the partition. The one-way control unit covers the oil hole to automatically adjust the opening of the oil flow channel according to the oil pressure. The oil flow channel is the oil flow path formed by the oil hole and the one-way control unit.

[0009] Alternatively, the one-way control body is configured as a spring-loaded plate valve, one end of which is connected to the partition, wherein there is a gap between the connection point of the plate valve and the oil hole.

[0010] Alternatively, one end of the plate valve can be detachably connected to the partition via fasteners.

[0011] Alternatively, the one-way control body is equipped with a ball bearing adapted to the oil hole, the ball bearing pressing against the oil hole, and the ball bearing being connected to the partition plate via an elastic positioning member.

[0012] Optionally, the pump body includes a pump casing, a pump cover, a rotor, and a cover plate. The pump casing has a pump cover and a cover plate at both ends, and the pump casing contains the partition plate. The area between the pump cover and the partition plate is the outer circulation chamber, in which the rotor is located. The area between the cover plate and the partition plate is the inner circulation chamber, in which a motor is located. The motor is connected to the pump casing, and the output shaft of the motor is drivenly connected to the rotor. The controller is detachably connected to the pump body via the cover plate.

[0013] Alternatively, the cover plate is provided with a hot melt column, and the controller is provided with a positioning hole adapted to the hot melt column. The controller is inserted into the cover plate, and the hot melt body formed after the hot melt column melts is fused onto the controller to fix the controller to the cover plate.

[0014] Alternatively, the pump casing is provided with an annular limiting groove, and the cover plate is embedded in the limiting groove and abuts against the groove wall on one side of the limiting groove; wherein, there is a gap between the cover plate and the groove wall on the other side of the limiting groove, and a clamp is embedded in the gap to press the cover plate against the groove wall of the limiting groove.

[0015] Alternatively, the clamp may be configured as an open retaining ring, and the retaining ring may be deformable under stress.

[0016] Alternatively, the electronic oil pump may also include a filter screen that is snapped onto the pump cover.

[0017] Alternatively, the cover plate is provided with an annular groove, in which a sealing ring is embedded, and the sealing ring is sealed against the pump housing.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0019] Through the above technical solution, the unidirectional control unit can automatically adjust the opening of the oil flow channel according to the external circulation oil pressure, avoiding the problem of uncontrollable internal circulation flow caused by traditional fixed flow channel design. Under high-pressure conditions, the internal circulation flow is increased to enhance the cooling effect; under low-pressure conditions, the internal circulation flow is reduced to improve the external circulation output capacity, achieving on-demand flow distribution. By dynamically adjusting the internal circulation flow, the unidirectional control unit effectively reduces the flow loss of the external circulation, avoiding the problem of decreased external circulation efficiency caused by excessive oil consumption in the internal circulation under unnecessary conditions. This allows the electronic oil pump to maintain efficient operation under different operating conditions, reducing energy consumption and extending equipment lifespan. This structure can adapt to complex and changing operating conditions. Whether in harsh environments with high load and high oil demand, or in low-load and low-energy-consumption operating scenarios, it can balance system pressure and heat dissipation requirements by adjusting the internal circulation flow, improving the reliability and stability of the electronic oil pump. The unidirectional control unit is based on automatic oil pressure adjustment, eliminating the need for additional complex control circuits or sensors, reducing system cost and design complexity, while also reducing failure points and improving the overall safety and maintenance convenience of the electronic oil pump. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0021] Figure 1 A three-dimensional structural schematic diagram of an electronic oil pump with an internal circulation flow control structure provided by this utility model in one embodiment;

[0022] Figure 2 A cross-sectional view of an electronic oil pump with an internal circulation flow control structure provided by this utility model in one embodiment.

[0023] Figure 3 A cross-sectional view of an electronic oil pump with an internal circulation flow control structure provided by this utility model in one embodiment, wherein... Figure 3and Figure 2 The sectional views are different;

[0024] Figure 4 for Figure 3 A magnified structural diagram of part A in the middle;

[0025] Figure 5 A cross-sectional view of an electronic oil pump with an internal circulation flow control structure provided by this utility model in one embodiment, wherein... Figure 5 and Figure 2 Different perspectives.

[0026] The attached diagram shows the following markings and corresponding component names: 1-Pump body, 11-Pump casing, 12-Pump cover, 13-Baffle plate, 131-Oil hole, 14-Rotor, 15-Cover plate, 2-Motor, 21-Stator, 22-Coil, 23-Output shaft, 3-Controller, 4-One-way control body, 5-Clamp, 6-Filter screen, 7-Sealing ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0028] According to specific embodiments of this disclosure, an electronic oil pump with an internal circulation flow control structure is provided. This electronic oil pump can achieve on-demand distribution of the internal circulation flow through a flow regulation mechanism, minimizing the impact on external circulation performance while ensuring lubrication and cooling effects, thereby improving the overall system efficiency. Figures 1 to 5 Specific embodiments thereof are shown.

[0029] See Figures 1 to 5 As shown, this disclosure provides an electronic oil pump with an internal circulation flow control structure. The electronic oil pump includes a pump body 1, which has a cavity. The cavity is divided into an external circulation cavity and an internal circulation cavity by a partition 13. The external circulation cavity is used to supply oil to external oil-using equipment. The internal circulation cavity is equipped with a motor 2 and a controller 3. The partition 13 has an oil hole 131. The electronic oil pump also includes a one-way control body 4, which is located in the internal circulation cavity and connected to the partition 13. The one-way control body 4 covers the oil hole 131 to automatically adjust the opening of the oil flow channel according to the oil pressure. The oil flow channel is the oil flow path formed by the oil hole 131 and the one-way control body 4.

[0030] This electronic oil pump achieves dual oil circulation by dividing the cavity within the pump body 1 into an external circulation chamber and an internal circulation chamber. The external circulation chamber is responsible for delivering oil to external oil-using equipment, providing lubrication and cooling; the internal circulation chamber is mainly used to cool components such as the motor 2 and controller 3, and to lubricate the motor's output shaft and sliding bearings. Oil holes 131 on the partition 13 serve as the channel for oil flow between the external and internal circulation chambers. A one-way control unit 4 covers the oil holes 131 and automatically adjusts the opening of the oil flow channel by sensing changes in oil pressure, thereby achieving dynamic control of the internal circulation flow rate.

[0031] Specifically, after the electronic oil pump starts, motor 2 drives the pump body to operate, and the external circulation chamber begins to build up oil pressure, delivering oil to external equipment. At this time, the one-way control body 4 is in its initial state, maintaining a certain oil flow channel opening based on the initial oil pressure to ensure that the internal circulation chamber receives a basic flow of oil, meeting the lubrication and cooling needs of motor 2 and controller 3. When the oil pressure in the external circulation chamber increases (e.g., due to increased load on external oil-using equipment or increased oil demand), the oil pressure acts on the one-way control body 4 through oil hole 131. Under high pressure, the one-way control body 4 deforms or displaces, increasing the oil flow channel opening and allowing more oil to flow from the external circulation chamber to the internal circulation chamber. At this time, the internal circulation flow increases, better cooling motor 2 and controller 3, while balancing pressure fluctuations in the external circulation system. When the oil pressure in the external circulation chamber decreases (e.g., due to low load operation of external equipment), the pressure acting on the one-way control body 4 decreases. Under its own elasticity or reset structure, the one-way control body 4 reduces the oil flow channel opening, restricting the flow of oil from the external circulation chamber to the internal circulation chamber. This allows the external circulation chamber to retain more oil for external output, reducing flow loss in the internal circulation and improving the oil delivery efficiency of the external circulation system. During the operation of the electronic oil pump, the unidirectional control unit 4 senses changes in oil pressure in real time and continuously and dynamically adjusts the opening of the oil flow channel to ensure that the internal circulation flow matches the external circulation demand, thereby optimizing system efficiency.

[0032] Through the above technical solution, the unidirectional control unit 4 can automatically adjust the opening of the oil flow channel according to the external circulation oil pressure, avoiding the problem of uncontrollable internal circulation flow caused by traditional fixed flow channel design. Under high-pressure conditions, the internal circulation flow is increased to enhance the cooling effect; under low-pressure conditions, the internal circulation flow is reduced to improve the external circulation output capacity, achieving on-demand flow distribution. By dynamically adjusting the internal circulation flow, the unidirectional control unit 4 effectively reduces the flow loss of the external circulation, avoiding the problem of decreased external circulation efficiency caused by excessive oil consumption in the internal circulation under unnecessary conditions. This allows the electronic oil pump to maintain efficient operation under different operating conditions, reducing energy consumption and extending equipment lifespan. This structure can adapt to complex and changing operating conditions. Whether in harsh environments with high load and high oil demand, or in low-load and low-energy-consumption operating scenarios, it can balance system pressure and heat dissipation requirements by adjusting the internal circulation flow, improving the reliability and stability of the electronic oil pump. The unidirectional control unit 4, based on automatic oil pressure adjustment, eliminates the need for additional complex control circuits or sensors, reducing system cost and design complexity, while also reducing failure points and improving the overall safety and maintenance convenience of the electronic oil pump.

[0033] It should be noted that the directional terms used, such as "inner" and "outer," refer to "inner" and "outer" relative to the outline of the electronic oil pump. The direction facing the axis of the electronic oil pump is "inner," and vice versa. Furthermore, it should be noted that the terms used, such as "first" and "second," are used to distinguish one element from another and do not indicate sequence or importance. Moreover, in the following descriptions with accompanying drawings, the same reference numerals in different drawings represent the same elements.

[0034] In a preferred embodiment, the unidirectional control body 4 is configured as a spring-loaded flap valve, one end of which is connected to the partition 13. A gap exists between the flap valve's connection point and the oil hole 131, allowing for automatic adjustment under hydraulic pressure by utilizing the flap valve's own elastic deformation characteristics. When the oil pressure in the external circulation chamber increases, the oil pressure acts on the non-connected end of the flap valve, pushing it to deform away from the oil hole 131, increasing the gap between the oil hole 131 and the flap valve (i.e., the oil flow channel opening), thereby allowing more oil to flow into the internal circulation chamber. When the oil pressure decreases, the flap valve resets under its own elastic force, reducing the flow channel opening and limiting the oil flow. This structure requires no additional power source or complex control mechanism; adaptive flow adjustment can be achieved solely through the dynamic balance between fluid pressure and the flap valve's elasticity.

[0035] Specifically, in this disclosure, the plate valve is square for ease of installation. In other embodiments, the plate valve may also be circular, elliptical, or any other suitable shape. This disclosure does not limit this, and those skilled in the art can flexibly configure it according to actual needs based on the technical concept of this disclosure.

[0036] The elastic coefficient, thickness, length, and distance between the connection point and the oil hole 131 of the valve can all serve as key variables for adjusting the flow control characteristics. For example, by adjusting the elastic material or thickness of the valve, its opening pressure threshold (i.e., the minimum oil pressure that triggers valve deformation) can be changed; by changing the distance between the connection point and the oil hole 131, the variation in the flow channel opening during valve deformation can be adjusted. This parametric design allows the structure to be flexibly optimized for different application scenarios (such as different oil pressure ranges and flow requirements), achieving precise flow control.

[0037] Compared to traditional active control components such as solenoid valves and electric regulating valves, the flexible plate valve structure significantly simplifies the mechanical design of electronic oil pumps. It eliminates the need for additional drive circuits, sensors, or complex transmission mechanisms, achieving flow regulation solely through mechanical elasticity, effectively reducing system manufacturing costs and failure rates. Simultaneously, it reduces the use of electronic components, avoiding potential problems such as electromagnetic interference and circuit failures, thus improving the long-term stability and reliability of the equipment.

[0038] When not under oil pressure, the valve plate can tightly fit against the baffle 13 to block the internal circulation oil circuit (or maintain a very small initial opening), reducing oil leakage in a static state. Under oil pressure, the flow channel formed by the deformation of the valve plate is relatively smooth, which can reduce the local resistance loss of oil flow. This design ensures the efficiency of external circulation under low load conditions, and achieves an increase in internal circulation flow at the lowest energy cost under high load conditions, further optimizing the overall energy efficiency of the electronic oil pump.

[0039] This flexible disc valve is small in size and lightweight, and can be directly integrated into the surface of the partition 13 without requiring additional installation space. Its modular design facilitates compatibility with different specifications of electronic oil pump bodies, and only the disc valve parameters need to be adjusted to meet diverse product requirements, significantly improving design flexibility and production versatility.

[0040] Furthermore, one end of the valve is detachably connected to the baffle 13 via fasteners. During the use of the electronic oil pump, the valve may experience wear and aging due to long-term exposure to oil scouring, corrosion, or frequent elastic deformation. The detachable connection allows for easy removal of the valve from the baffle 13 when maintenance or replacement is needed, eliminating the need for extensive disassembly of the entire electronic oil pump. This reduces maintenance costs and repair time, improving equipment maintainability.

[0041] Meanwhile, the detachable connection method allows technicians to easily replace valves with different parameters (such as different elastic coefficients, thicknesses, lengths, etc.), quickly conduct comparative tests, and thus more efficiently find the valve parameters most suitable for specific application scenarios, optimizing the performance of the electronic oil pump.

[0042] Furthermore, the detachable fastener connection facilitates the assembly of the valve plate and the diaphragm 13. The valve plate and diaphragm 13 can be machined and inspected separately before being quickly assembled using fasteners, which promotes standardized production and improves production efficiency and product quality consistency.

[0043] Furthermore, in one embodiment, a snap-fit ​​structure is provided on the partition 13, and one end of the valve is designed as a matching snap block or slot. The connection is achieved by inserting the snap block into the slot or locking the slot with the snap block. This connection method is convenient for installation and disassembly, and to a certain extent, it can ensure the tightness of the connection between the valve and the partition 13, preventing oil leakage.

[0044] In another embodiment, the fasteners can be configured as standard parts such as screws and bolts, so that the plate valve can be connected to the partition 13 by means of a threaded connection.

[0045] In another embodiment, the one-way control body 4 is equipped with a ball bearing adapted to the oil hole 131, the ball bearing pressing against the oil hole 131, and the ball bearing being connected to the partition plate 13 by an elastic positioning member.

[0046] Using a ball bearing as the core component of the unidirectional control body 4, its spherical structure and the design that adapts to the oil hole 131 enable high-precision sealing. Under low oil pressure conditions, the ball bearing, under the elastic force of the elastic positioning element, tightly adheres to the oil hole 131, blocking the flow of oil from the external circulation chamber to the internal circulation chamber, minimizing the loss of external circulation flow. When the oil pressure in the external circulation chamber increases, the oil pressure overcomes the elastic force of the elastic positioning element, pushing the ball bearing away from the oil hole 131, forming an annular gap as an oil flow channel. The higher the oil pressure, the greater the ball bearing displacement and the larger the flow channel opening, thus achieving the function of automatically adjusting the internal circulation flow according to the oil pressure. This structure utilizes the point-to-surface contact characteristics of the ball bearing, which, compared to a flat plate valve, can more accurately control the opening and closing of the flow channel, improving the sensitivity and stability of flow regulation.

[0047] When the balls are pushed apart by hydraulic pressure to form a flow channel, their spherical profile allows the oil to pass through more smoothly, reducing eddies and turbulence in the fluid flow and lowering local resistance losses. Furthermore, the relatively regular cross-section of the annular flow channel between the balls and the oil hole 131 facilitates uniform oil distribution. Compared to irregular flow channel designs, this design allows for more efficient utilization of oil flow, reduces energy waste due to flow resistance, and improves the overall energy efficiency of the electronic oil pump.

[0048] The elastic positioning element fixes the ball bearing to the partition 13. Its installation is simple; the ball bearing and positioning element are pre-assembled and then installed as a whole onto the partition 13, reducing assembly complexity and process requirements. Simultaneously, this structure utilizes the limiting effect of the elastic positioning element to ensure stable movement of the ball bearing above the oil hole 131, preventing ball bearing displacement or jamming due to vibration or oil pressure fluctuations, thus enhancing the structural stability and reliability of the system.

[0049] By adjusting parameters such as the elastic coefficient of the elastic positioning element, the size of the ball bearing, and the clearance between the ball bearing and the oil hole 131, it is possible to flexibly adapt to different pressure ranges and flow requirements. For example, for high-pressure, high-flow-rate applications, a positioning element with a high elastic coefficient and a larger diameter ball bearing can be selected; for low-pressure, low-flow-rate applications, the elastic force of the positioning element can be reduced and the size of the ball bearing can be decreased, thereby meeting the performance optimization requirements of the electronic oil pump under different operating conditions.

[0050] In one embodiment provided in this disclosure, the pump body 1 includes a pump casing 11, a pump cover 12, a rotor 14, and a cover plate 15. The pump casing 11 is provided with a pump cover 12 and a cover plate 15 at both ends. A partition 13 is provided in the pump casing 11. The area between the pump cover 12 and the partition 13 is an outer circulation cavity, in which the rotor 14 is provided. The area between the cover plate 15 and the partition 13 is an inner circulation cavity, in which a motor 2 is provided. The motor 2 is connected to the pump casing 11, and the output shaft 23 of the motor 2 is drivenly connected to the rotor 14. The controller 3 is detachably connected to the pump body 1 through the cover plate 15.

[0051] The pump body 1 operates primarily based on the principles of electromagnetic induction and fluid mechanics. The motor 2 generates a rotating magnetic field in its stator 21 through electromagnetic induction, causing the rotor 14, which is connected to its output shaft 23, to rotate. The rotation of the rotor 14 drives the flow of oil in the outer circulation chamber, thereby generating oil pressure. The outer and inner circulation chambers are connected by a connecting channel, and a plate valve is installed as a flow control component. The plate valve automatically adjusts its opening size according to the oil pressure transmitted from the outer circulation chamber, thereby controlling the flow rate of oil entering the inner circulation chamber and cooling the motor 2 and other heat-generating components.

[0052] When the pump is powered on, the controller 3 starts working, supplying power to the coil 22 of the motor 2. At this time, the coil 22 of the motor 2 generates an alternating magnetic field. Under the action of this alternating magnetic field, the stator 21 of the motor 2 generates electromagnetic force, which in turn drives the rotor 14 to rotate through the output shaft 23 of the motor 2. The rotor 14 rotates in the outer circulation cavity. Due to the interaction between the blades or gear structure of the rotor 14 and the oil, the oil in the outer circulation channel cavity will flow. As the rotor 14 continues to rotate, oil pressure gradually builds up in the outer circulation channel cavity. The oil pressure generated in the outer circulation channel cavity is transmitted to the plate valve through the connecting channel. When the oil pressure reaches a certain level, it can overcome the resistance of the plate valve and open it. The greater the oil pressure, the larger the opening of the plate valve, allowing more oil to enter the inner circulation channel cavity from the outer circulation cavity through the connecting channel. The oil entering the inner circulation channel cavity will absorb the heat generated by the motor 2 during operation, playing a cooling role. Afterwards, the oil that has undergone heat exchange may return to the outer circulation cavity through a specific return channel, forming a complete cycle. During pump operation, changes in external load cause alterations in the oil pressure within the external circulation channel. When the oil pressure increases, the valve opening widens, increasing the internal circulation flow rate to better handle potential increases in heat generation. Conversely, when the oil pressure decreases, the valve opening narrows, reducing the internal circulation flow rate and allowing more oil to be used for external circulation to meet the needs of external oil-using equipment.

[0053] By dividing the pump body 1 into an external circulation chamber and an internal circulation chamber, the pump achieves both external and internal oil circulation functions. The external circulation provides the required oil to external oil-using equipment, while the internal circulation cools and lubricates key components such as the motor 2 inside the pump, ensuring the normal operation of the pump.

[0054] The disc valve design allows the internal circulation flow rate to automatically adjust based on the external circulation oil pressure. This dynamically distributes the oil flow rate according to actual operating conditions, preventing excessive oil from entering the internal circulation unnecessarily and ensuring sufficient flow to external equipment in the external circulation. The disc valve's automatic adjustment function enables the pump to adapt to different external loads and operating conditions. Whether under high pressure and high flow conditions or low pressure and low flow conditions, the pump can meet actual needs by adjusting the internal circulation flow rate, demonstrating strong adaptability.

[0055] The controller 3 is detachably connected to the pump body 1 via the cover plate 15, facilitating the inspection and replacement of the controller 3. At the same time, the relatively independent installation of each component makes the entire pump more convenient for maintenance and troubleshooting.

[0056] In this way, by rationally distributing the oil flow, oil waste can be avoided, allowing the pump to maintain high operating efficiency under different working conditions. For example, reducing the internal circulation flow at low loads lowers the pump's energy consumption; increasing the internal circulation flow at high loads effectively removes heat, ensuring stable pump performance. The cooling effect of the internal circulation on heat-generating components such as the motor reduces their operating temperature, decreases the probability of failures due to overheating, extends component lifespan, and thus improves the overall reliability and stability of the pump.

[0057] Furthermore, the cover plate 15 is provided with a hot melt column, and the controller 3 is provided with a positioning hole adapted to the hot melt column. The controller 3 is inserted into the cover plate 15, and the hot melt body formed after the hot melt column melts is fused onto the controller 3 to fix the controller 3 onto the cover plate 15.

[0058] The hot-melt column on the cover plate 15 is adapted to the positioning hole on the controller 3. When installing the controller 3, it can guide the controller 3 to be accurately inserted into the cover plate 15, ensuring the relative positional accuracy between the controller 3 and the cover plate 15, and ensuring accurate connection and fit between the controller 3 and other components of the pump body 1. The hot-melt body formed after the hot-melt column melts is fused onto the controller 3, firmly fixing the controller 3 to the cover plate 15. This prevents the controller 3 from shifting or loosening due to external forces such as vibration and impact during pump operation, ensuring the stability of the connection between the controller 3 and the pump body 1.

[0059] The hot melt cladding onto the controller 3 fills the gap between the controller 3 and the cover plate 15 to a certain extent, providing a seal and preventing impurities such as oil and dust from entering the space between the controller 3 and the cover plate 15, thus affecting the normal operation of the controller 3 and improving the pump's protective performance. The hot melt formed after the hot melt column melts adheres to the surface of the controller 3, resulting in a smoother and more aesthetically pleasing appearance. Compared to traditional fastener connections, there are no protruding parts such as screw heads or nuts, making the overall appearance of the pump simpler and neater. Furthermore, the strong bonding force formed by the hot melt connection can withstand a certain degree of external force and vibration, ensuring that the controller 3 remains stably fixed to the cover plate 15 throughout the pump's entire service life. This reduces the probability of malfunctions caused by loose connections, improving the pump's reliability and stability. This fixing method is relatively simple and quick, eliminating the need for additional fasteners such as screws and nuts, reducing assembly steps and time, improving the assembly efficiency of the pump body 1, and facilitating large-scale production.

[0060] In this disclosure, the pump casing 11 is provided with an annular limiting groove, and the cover plate 15 is embedded in the limiting groove and abuts against the groove wall on one side of the limiting groove; wherein, there is a gap between the cover plate 15 and the groove wall on the other side of the limiting groove, and a clamp 5 is embedded in the gap to press the cover plate 15 against the groove wall of the limiting groove.

[0061] The annular limiting groove on the pump casing 11 provides a specific installation position for the cover plate 15. After the cover plate 15 is inserted into the limiting groove, it abuts against one side of the groove wall, while a gap is reserved between the cover plate 15 and the other side of the groove wall. The clamp 5 is installed in this gap, and the tightening action of the clamp 5 secures the cover plate 15 tightly against the groove wall of the limiting groove. The annular limiting groove provides a clear installation position and guide for the cover plate 15, ensuring that the cover plate 15 can be accurately installed onto the pump casing 11. During installation, the operator only needs to align the cover plate 15 with the limiting groove to ensure the relative positional accuracy between the cover plate 15 and the pump casing 11, avoiding problems such as poor sealing and poor component fit caused by installation deviations. This structural design makes the installation process of the cover plate 15 simpler and more efficient. Compared with some complex installation methods, such as using multiple bolts and nuts for fixing, the combination of the limiting groove and the clamp 5 reduces the installation steps, lowers the installation difficulty, and improves production efficiency.

[0062] When the cover plate 15 is embedded in the limiting groove and abuts against one side of the groove wall, a preliminary sealing surface is formed between the two. This fit effectively reduces the possibility of oil leakage from the connection between the cover plate 15 and the pump casing 11, providing basic sealing protection for the normal operation of the pump. After the clamp 5 is inserted into the gap and tightened, it applies a uniform pressure to the cover plate 15, making the cover plate 15 more tightly abut against the groove wall of the limiting groove. This additional pressure further enhances the fit of the sealing surface, improves the sealing performance, and effectively prevents oil leakage, especially when the oil pressure inside the pump is high, ensuring a good sealing effect.

[0063] The gap between the cover plate 15 and the wall of the limiting groove on the other side not only provides installation space for the clamp 5, but also plays a certain role in buffering. During pump operation, vibration and impact will occur, and the gap can absorb some energy, reducing the impact of vibration and impact on the connection between the cover plate 15 and the pump casing 11, and avoiding loosening or damage to the connection due to excessive vibration. The clamp 5 usually has a certain degree of elasticity, and when the pump vibrates, the clamp 5 can play a certain role in shock absorption, further reducing the damage of vibration to the connection and extending the service life of the pump.

[0064] If maintenance or replacement of the cover plate 15 is required, it can be easily removed from the limiting groove simply by loosening the clamp 5, without the need for complex disassembly. This design makes pump maintenance and repair more convenient and faster, reducing maintenance costs and downtime. During disassembly and replacement, components such as the clamp 5 and cover plate 15 can be reused; as long as these components are not damaged, there is no need to replace them with new ones, further reducing maintenance costs.

[0065] Specifically, the clamp 5 is equipped with an open retaining ring, which can deform under stress. This open retaining ring structure provides high flexibility during installation. After the cover plate 15 is fitted into the limiting groove of the pump housing 11, the open retaining ring can be easily placed into the gap between the cover plate 15 and the groove wall on the other side. Then, by applying external force to deform the retaining ring, it can be smoothly engaged into the appropriate position within the gap. Compared to a closed clamp 5, the open retaining ring eliminates the need for complete disassembly of the entire component or complex assembly operations, greatly simplifying the installation process and improving assembly efficiency.

[0066] When maintenance, repair, or replacement of the cover plate 15 is required, the openness and deformability of the retaining ring can also be utilized. Simply apply a reverse force to deform the retaining ring, and it can be easily removed from the gap, thereby detaching the cover plate 15 from the limiting groove. This convenient disassembly method reduces maintenance time and costs, and lowers the risk of damage to the equipment.

[0067] In actual production and assembly, due to factors such as manufacturing tolerances, the gap between the cover plate 15 and the limiting groove may vary. The open and deformable retaining ring can adapt to this change in gap size. When the gap is large, the retaining ring can better fill the gap after deformation under force; when the gap is small, the retaining ring can also deform and fit tightly within the gap, ensuring that the retaining ring can effectively press the cover plate 15 against the groove wall of the limiting groove, achieving a good fixing effect.

[0068] After being deformed under stress, the retaining ring can fit tightly against the surfaces of the cover plate 15 and the limiting groove wall. This tight fit not only enhances the retaining ring's fixing effect on the cover plate 15 but also improves the sealing performance. The tight contact between the retaining ring and the component surface reduces the possibility of oil leakage, ensures the normal operation of the oil circulation system inside the electronic oil pump, and improves the reliability and stability of the equipment.

[0069] Furthermore, the deformable open structure of the clamp 5 offers good versatility, allowing it to be applied to various specifications and models of electronic oil pumps. As long as the clearance is within a certain range, the clamp can adapt through deformation to achieve effective fixing. This enables the clamp to be manufactured and used as a universal component, improving interchangeability and versatility, and facilitating equipment production and maintenance.

[0070] Furthermore, the electronic oil pump also includes a filter screen 6, which is snapped onto the pump cover 12. The filter screen 6 can intercept impurities such as metal shavings and dust particles, ensuring that the oil entering the pump body is relatively clean, thereby protecting the pump components and reducing the frequency of maintenance and replacement. The filter screen 6 effectively prevents impurities from entering the oil circuit, ensuring unobstructed oil circulation and maintaining the normal operation of the electronic oil pump.

[0071] In this disclosure, at the engagement point between the pump cover 12 and the filter screen 6, at least two engagement points are provided, which helps to improve the reliability of the filter screen 6's position. In one embodiment, the number of engagement points is four or six, so that the filter screen 6 is subjected to uniform fixing force at multiple points, reducing the shaking and displacement of the filter screen 6 during operation.

[0072] In one embodiment, further, based on the snap-fit ​​connection between the filter screen 6 and the pump cover 12, several fastening bolts are provided around the filter screen 6 or at specific locations. By tightening the bolts, the filter screen 6 is further fixed to the pump cover 12, enhancing the stability of the filter screen 6 installation. However, it is important to ensure that the bolt material is compatible with the pump body material to avoid electrochemical corrosion.

[0073] In another embodiment, corresponding positioning pin holes can be machined on the pump cover 12 and the filter screen 6 respectively, and the positioning pins are inserted into the pin holes during installation. The positioning pins can restrict the movement of the filter screen 6 in the plane, improve the accuracy and stability of its position, and can also withstand the oil pressure on the filter screen 6 to a certain extent.

[0074] In this disclosure, the filter screen 6 is equipped with a stainless steel filter screen or a high-strength plastic filter screen, which enables it to withstand the impact and pressure of oil flow and is not easily deformed or broken, thereby ensuring that the filter screen maintains the stability of its shape and position during long-term operation.

[0075] Furthermore, the filter screen can be configured with two or three layers, thereby ensuring filtration effectiveness while distributing oil pressure. Alternatively, reinforcing ribs can be added to the surface of the filter screen to enhance its resistance to deformation under external forces, allowing the filter screen to better maintain its fixed position.

[0076] Furthermore, the cover plate 15 is provided with an annular groove, in which a sealing ring 7 is embedded, and the sealing ring 7 is sealed against the pump housing 11. When the cover plate 15 is fitted into the pump housing 11, the sealing ring 7 is compressed and deformed, tightly filling the gap between the cover plate 15 and the pump housing 11, forming an annular sealing surface, effectively preventing leakage of internal or external circulating oil from the connection between the cover plate 15 and the pump housing 11. Especially under high pressure conditions, the oil pressure will further compress the sealing ring 7, making it fit more tightly against the surface of the pump housing 11, thereby achieving reliable sealing under dynamic pressure and ensuring the integrity of the internal oil circulation system of the electronic oil pump.

[0077] Due to errors in the manufacturing process and assembly, the mating surfaces of the cover plate 15 and the pump casing 11 may not fit perfectly flat. The sealing ring 7 in the annular groove can adaptively compensate for these minute gaps or surface unevenness through elastic deformation, ensuring that the sealing effect is not affected by assembly errors, improving product consistency and reliability, and reducing after-sales maintenance costs due to seal failure.

[0078] In one embodiment, the annular groove is designed in a stepped shape. The inner groove is used to install the sealing ring 7, and the outer groove can accommodate excess deformable material of the sealing ring 7, preventing the sealing ring 7 from being squeezed out or damaged due to excessive compression. At the same time, the stepped structure can increase the contact area between the sealing ring 7 and the cover plate 15 and the pump housing 11, further improving the sealing performance.

[0079] In another embodiment, a positioning boss is provided at the bottom or side wall of the annular groove to cooperate with the groove or protrusion of the sealing ring 7, so as to prevent the sealing ring 7 from circumferentially displacing during installation or operation and to ensure the accuracy and stability of the sealing position.

[0080] The cover plate 15 is provided with heat dissipation holes, so that the cover plate 15 can be used as a heat dissipation channel to transfer the heat of the inner circulation chamber to the outside air.

[0081] In this disclosure, a sensor mounting slot can also be reserved on the cover plate 15 for integrating monitoring elements such as temperature and pressure to obtain the operating parameters in the inner circulation chamber in real time. These sensors can be linked with the controller 3 to realize intelligent monitoring and flow regulation of the pump's operating status. At the same time, the sealing function of the annular groove can prevent oil from entering the sensor and ensure monitoring accuracy.

[0082] In this disclosure, the controller is configured as a PCB board, i.e., a printed circuit board. As this is prior art, it will not be described in detail here.

[0083] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electronic oil pump with an internal circulation flow control structure, the electronic oil pump comprising a pump body having a cavity, the cavity being divided into an external circulation cavity and an internal circulation cavity by a partition, wherein, The external circulation chamber is used to supply oil to external oil-using equipment; the internal circulation chamber is equipped with a motor and a controller, and the partition plate is provided with an oil hole. The electronic oil pump is characterized in that it further includes a one-way control body, which is located in the internal circulation chamber and connected to the partition plate. The one-way control body covers the oil hole so as to automatically adjust the opening of the oil flow channel according to the oil pressure. The oil flow channel is the oil flow path formed by the oil hole and the one-way control body.

2. The electronic oil pump with an internal circulation flow control structure according to claim 1, characterized in that, The one-way control body is equipped with a spring-loaded plate valve, one end of which is connected to the partition plate, wherein there is a gap between the connection point of the plate valve and the oil hole.

3. The electronic oil pump with an internal circulation flow control structure according to claim 2, characterized in that, One end of the disc valve is detachably connected to the partition via fasteners.

4. The electronic oil pump with an internal circulation flow control structure according to claim 1, characterized in that, The one-way control body is equipped with a ball bearing adapted to the oil hole. The ball bearing presses against the oil hole and is connected to the partition plate by an elastic positioning member.

5. The electronic oil pump with an internal circulation flow control structure according to claim 1, characterized in that, The pump body includes a pump casing, a pump cover, a rotor, and a cover plate. The pump casing has a pump cover and a cover plate at both ends, and a partition is provided in the pump casing. The area between the pump cover and the partition is the outer circulation chamber, in which the rotor is located. The area between the cover plate and the partition is the inner circulation chamber, in which a motor is located. The motor is connected to the pump casing, and the output shaft of the motor is drivenly connected to the rotor. The controller is detachably connected to the pump body through the cover plate.

6. The electronic oil pump with an internal circulation flow control structure according to claim 5, characterized in that, The cover plate is provided with a hot melt column, and the controller is provided with a positioning hole adapted to the hot melt column. The controller is inserted into the cover plate, and the hot melt body formed after the hot melt column melts is fused onto the controller to fix the controller to the cover plate.

7. The electronic oil pump with an internal circulation flow control structure according to claim 5, characterized in that, The pump casing is provided with an annular limiting groove, and the cover plate is embedded in the limiting groove and abuts against the groove wall on one side of the limiting groove; wherein, there is a gap between the cover plate and the groove wall on the other side of the limiting groove, and a clamp is embedded in the gap to press the cover plate against the groove wall of the limiting groove.

8. The electronic oil pump with an internal circulation flow control structure according to claim 7, characterized in that, The clamp is configured with an open retaining ring, and the retaining ring can deform under stress.

9. The electronic oil pump with an internal circulation flow control structure according to claim 5, characterized in that, The electronic oil pump also includes a filter screen that is snapped into the pump cover.

10. The electronic oil pump with an internal circulation flow control structure according to claim 5, characterized in that, The cover plate is provided with an annular groove, and a sealing ring is embedded in the annular groove, and the sealing ring is sealed against the pump casing.

Images