An electric external gear pump device

Abstract

The utility model provides a kind of electric external engagement gear pump device, including pump shell, drive motor, oil inlet connector and oil outlet connector.Pump shell is equipped with pump cavity and the oil inlet hole and oil outlet hole of intercommunication, gear set is installed in pump cavity;Drive motor is fixed on the outside of pump shell and drives gear set rotation.Oil inlet connector includes rotatable and inserting in oil inlet hole inlet connection pipe, first fastener and lateral wall intercommunication oil inlet connector;Oil outlet connector includes rotatable and inserting in oil outlet hole outlet connection pipe, second fastener and lateral wall intercommunication oil outlet connector.The device is designed through rotatable connection pipe, realizes connector rotation adjustment, solves the problem that compact aircraft installation space is limited;With snap ring limiting step and double sealing gasket structure, angle flexibility and sealing reliability are considered, and space adaptability is improved.

Description

Technical Field

[0001] This utility model relates to the field of fuel pump technology, and more specifically, to an electric external gear pump device. Background Technology

[0002] As a core component of the fuel supply system of an aero-engine, the performance of the fuel pump directly affects the engine's combustion efficiency, operational stability, and overall safety. During the working cycle of an aero-engine, the fuel pump must overcome the pipeline resistance between the fuel tank and the combustion chamber, pressurize the fuel from a low-pressure state to a high-pressure state that meets the atomization requirements of the combustion chamber, and precisely control the fuel flow rate to match the power demands of the engine under different operating conditions.

[0003] Currently, the inlet and outlet connectors of mainstream fuel pumps are generally integrated into the pump body housing using welding, threaded fixing, or other connection methods, forming a fixed pipeline interface direction. While this directional connector design can meet the installation requirements of traditional large aircraft, it reveals significant limitations in applications to compact aircraft (such as light sport aircraft, UAVs, and rotorcraft): due to the connector direction, the fuel pump must be precisely aligned with the airframe piping system, which restricts its placement and angle selection within the confined cabin space, making it difficult to meet the high requirements for component integration in compact aircraft.

[0004] As the aviation industry moves towards lightweighting and miniaturization, the requirements for space utilization in compact aircraft are becoming increasingly stringent. The limitations of fuel pump layout directly trigger a chain reaction: on the one hand, it forces more complex airframe piping designs, increasing pipe length and weight, and reducing aircraft range; on the other hand, it restricts the overall structural optimization of the engine compartment, making it difficult to achieve a more compact power system layout. This, in turn, hinders breakthroughs in core indicators such as range, payload, and aerodynamic performance of compact aircraft, becoming one of the key bottlenecks impeding its technological development. Utility Model Content

[0005] The technical problem to be solved by this application is the limited installation space caused by the fixed angle of the fuel pump connector in compact aircraft. In order to overcome the above-mentioned defects of the prior art, this application provides an electric external gear pump device.

[0006] This application provides an electric external gear pump device, comprising:

[0007] A pump casing with a pump chamber inside, the pump casing having an oil inlet and an oil outlet that connect to the pump chamber, and a gear set rotatably installed inside the pump chamber for pumping oil from the oil inlet to the oil outlet;

[0008] The drive motor is fixedly installed on the outside of the pump casing, and its rotating output end is connected to the gear set for driving the rotation of the gear set.

[0009] An oil inlet connector includes an inlet connecting pipe, a first fastener, and an oil inlet fitting; the inlet connecting pipe is rotatably inserted into the oil inlet hole and coaxially arranged with the oil inlet hole; the first fastener is used to detachably connect the inlet connecting pipe to the pump housing; the oil inlet fitting is fixedly arranged on the side wall of the inlet connecting pipe and communicates with the inside of the inlet connecting pipe, and the oil inlet fitting is used to connect to an external oil inlet pipe;

[0010] An oil outlet connector includes an oil outlet connecting tube, a second fastener, and an oil outlet fitting; the oil outlet connecting tube is rotatably inserted into the oil outlet hole and is coaxially arranged with the oil outlet hole; the second fastener is used to detachably connect the oil outlet connecting tube to the pump housing; the oil outlet fitting is fixedly arranged on the side wall of the oil outlet connecting tube and communicates with the inside of the oil outlet connecting tube, and the oil outlet fitting is used to connect to an external oil outlet tube.

[0011] Compared with the prior art, the electric external gear pump device disclosed in this application has the following advantages: the oil inlet connector and the oil outlet connector are rotatable, which allows the direction of the oil inlet connector and the oil outlet connector to be flexibly adjusted, solving the problem of directional limitation when installing traditional fixed connectors in the narrow space of compact aircraft, adapting to different airframe pipeline layouts, and improving space utilization; the detachable connection structure (first fastener, second fastener) facilitates the disassembly and maintenance of the oil inlet connector and the oil outlet connector, and realizes the directional locking of the oil inlet connector and the oil outlet connector.

[0012] In one possible implementation, the end of the inlet connecting pipe facing the pump housing is provided with a first retaining ring, which is inserted into the oil inlet hole. A first limiting step is provided between the first retaining ring and the inlet connecting pipe, and the first limiting step abuts against the port of the oil inlet hole. The end of the inlet connecting pipe away from the first retaining ring is provided with a first plug. Compared with the prior art, the cooperation between the first retaining ring and the oil inlet hole, as well as the abutting effect of the first limiting step, restricts the axial displacement of the inlet connecting pipe, ensuring its stability during rotation and preventing axial movement from affecting the sealing performance. The first plug seals the end of the inlet connecting pipe, preventing oil leakage from the end, and at the same time provides an installation support point for the first fastener.

[0013] In one possible implementation, the first fastener is a hexagonal screw A, which is coaxially inserted into the inlet connecting pipe. The hexagonal head of the screw A presses against a first plug, and the screw shaft of the screw A passes through the first plug and is threaded into the pump housing. Compared with the prior art, after the hexagonal screw A is unlocked, the inlet connecting pipe can rotate smoothly; after the hexagonal screw A is tightened, the inlet connecting pipe cannot be loosened. That is, the tightening method of the hexagonal screw A is simple and reliable. The axial pressure stably presses the inlet connecting pipe onto the pump housing, ensuring both the flexibility of the inlet connecting pipe during rotation and the firmness of the connection. The coaxial screw ensures uniform force distribution, avoiding sealing failure caused by force misalignment of the inlet connecting pipe.

[0014] In one possible implementation, a first inlet sealing gasket is fitted onto the first retaining ring, abutting between the first limiting step and the oil inlet port; a second inlet sealing gasket is fitted onto the screw of the hexagonal screw A, abutting between the first plug and the hexagonal head of the hexagonal screw A. Compared with the prior art, the double sealing gasket design enhances the sealing performance of the oil inlet connection. The first inlet sealing gasket prevents oil leakage from between the oil inlet port and the first limiting step, and the second inlet sealing gasket prevents oil leakage from between the first plug and the screw head, thus improving the overall leak-proof performance.

[0015] In one possible implementation, a second retaining ring is provided at the end of the outlet connecting pipe facing the pump housing. The second retaining ring is inserted into the oil outlet hole. A second limiting step is provided between the second retaining ring and the outlet connecting pipe, and the second limiting step abuts against the port of the oil outlet hole. A second plug is provided at the end of the outlet connecting pipe away from the second retaining ring. Compared with the prior art, this design is the same as the structure of the inlet connecting pipe. The structure of the second retaining ring, the second limiting step, and the second plug restricts the axial displacement of the outlet connecting pipe, ensuring its rotational stability. At the same time, the second plug prevents leakage at the oil outlet end and provides installation support for the second fastener.

[0016] In one possible implementation, the second fastener is a hexagonal screw B, which is coaxially inserted into the outlet connecting pipe. The hexagonal head of the hexagonal screw B presses against the second plug, and the screw shank of the hexagonal screw B passes through the second plug and is threaded into the pump housing. Compared with the prior art, after the hexagonal screw B is unlocked, it ensures smooth rotation of the outlet connecting pipe; after the hexagonal screw B is tightened, it prevents the outlet connecting pipe from loosening, thus ensuring the reliability of the oil outlet connector.

[0017] In one possible implementation, a first sealing gasket is fitted onto the second retaining ring, abutting between the second limiting step and the oil outlet port; a second sealing gasket is fitted onto the screw of the hexagonal screw B, abutting between the second plug and the hexagonal head of the hexagonal screw B. Compared with the prior art, the double sealing gaskets enhance the sealing performance of the oil outlet connection, preventing oil leakage from between the oil outlet port and the second limiting step, and between the second plug and the screw head, thus improving the overall sealing performance.

[0018] In one possible implementation, the pump casing includes an upper casing, a middle casing, and a lower casing, which are connected and assembled by bolts. Compared with the prior art, the detachable casing structure facilitates the installation, inspection, and replacement of components such as gear sets inside the pump chamber, reduces maintenance difficulty, and allows operation of internal core components without disassembling the entire pump body, thus improving maintenance efficiency.

[0019] In one possible implementation, the pump chamber wall and the outer surface of the gear set are both coated with DLC. Compared with the prior art, the DLC coating has the characteristics of high hardness and low coefficient of friction, which can reduce friction and wear between the pump chamber and gears, and between gears, extend the service life of the device, and improve mechanical efficiency; at the same time, the coating has good chemical stability, which can improve the corrosion resistance of the pump chamber and gear set, adapt to different types of oil media, and enhance the applicability of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this application;

[0021] Figure 2 This is a cross-sectional view of this application;

[0022] Figure 3 for Figure 2 Enlarged view of part of the image;

[0023] Figure 4 This is a partial structural diagram of the oil inlet connector;

[0024] Figure 5 This is a partial structural diagram of the oil outlet connector;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Pump housing; 11. Upper housing; 12. Middle housing; 13. Lower housing; 2. Pump chamber; 3. Oil inlet; 4. Oil outlet; 5. Gear set; 6. Drive motor; 7. Oil inlet connector; 71. Inlet connecting pipe; 711. First retaining ring; 712. First limiting step; 713. First plug; 72. First fastener; 73. Oil inlet connector; 74. First inlet sealing gasket; 75. Second inlet sealing gasket; 8. Oil outlet connector; 81. Outlet connecting pipe; 811. Second retaining ring; 812. Second limiting step; 813. Second plug; 82. Second fastener; 83. Oil outlet connector; 84. First outlet sealing gasket; 85. Second outlet sealing gasket. Detailed Implementation

[0027] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0029] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] See Figures 1 to 5This application discloses an electric external gear pump device, comprising: a pump housing 1, a drive motor 6, an oil inlet connector 7, and an oil outlet connector 8. The pump housing 1 has a pump chamber 2, and an oil inlet hole 3 and an oil outlet hole 4 communicating with the pump chamber 2. A gear set 5 is rotatably mounted inside the pump chamber 2 for pumping oil from the oil inlet hole 3 to the oil outlet hole 4. The drive motor 6 is fixedly mounted on the outside of the pump housing 1, and its rotating output end is connected to the gear set 5 for driving the rotation of the gear set 5. The oil inlet connector 7 includes an inlet connecting pipe 71, a first fastener 72, and an oil inlet fitting 73. The inlet connecting pipe 71 is rotatably inserted into the oil inlet hole 3 and coaxially arranged with the oil inlet hole 3. The first fastener 72 is used to detachably connect the inlet connecting pipe 71 to the pump... On the housing 1; the oil inlet connector 73 is fixedly installed on the side wall of the inlet connecting pipe 71 and communicates with the inside of the inlet connecting pipe 71. The oil inlet connector 73 is used to connect to the external oil inlet pipe; the oil outlet connector 8 includes an outlet connecting pipe 81, a second fastener 82 and an oil outlet connector 83; the outlet connecting pipe 81 is rotatably inserted into the oil outlet hole 4 and is coaxially arranged with the oil outlet hole 4; the second fastener 82 is used to detachably connect the outlet connecting pipe 81 to the pump housing 1; the oil outlet connector 83 is fixedly installed on the side wall of the outlet connecting pipe 81 and communicates with the inside of the outlet connecting pipe 81. The oil outlet connector 83 is used to connect to the external oil outlet pipe.

[0032] The core structure of this device comprises four key parts: pump housing 1, drive motor 6, oil inlet connector 7, and oil outlet connector 8. The pump housing 1, serving as the basic load-bearing component, contains a pump chamber 2 machined inside to hold the oil and perform the pumping function. An oil inlet hole 3 and an oil outlet hole 4 are respectively formed on the wall of the pump housing 1, both communicating with the pump chamber 2 to form a flow path for the oil. Inside the pump chamber 2, a set of meshing gears 5 (including a driving gear and a driven gear) are rotatably mounted via bearings. When the gear set 5 rotates, the change in the volume between the gears generates a suction and discharge action, drawing the oil from the oil inlet hole 3 and discharging it through the oil outlet hole 4, thus completing the pumping process.

[0033] The drive motor 6 is mounted on the outer wall of the pump casing 1 by bolts or other fixing methods. Its rotating output shaft is connected to the drive gear in the gear set 5 through a coupling or other transmission method, providing continuous rotational power to the gear set 5 and ensuring stable oil delivery.

[0034] The structural design of the oil inlet connector 7 is key to achieving multi-angle connections. The inlet connector 71 adopts a cylindrical hollow structure, with one end rotatably inserted into the oil inlet hole 3 and coaxially positioned with it. It is detachably fixed to the pump housing 1 by the first fastener 72. The oil inlet fitting 73 has a tubular structure and is vertically fixed to the side wall of the inlet connector 71. Its interior communicates with the hollow channel of the inlet connector 71, and its end is equipped with a standard interface for sealing connection with an external oil inlet pipe. Since the inlet connector 71 is rotatable, the oil inlet fitting 73 can rotate and adjust its angle to adapt to different pipeline layout requirements.

[0035] The oil outlet connector 8 is symmetrically arranged with the oil inlet connector 7. The oil outlet connecting pipe 81 is also a cylindrical hollow structure, which is rotatably inserted into the oil outlet hole 4 and kept coaxial. It is detachably fixed to the pump housing 1 by the second fastener 82. The oil outlet connector 83 is vertically fixed to the side wall of the oil outlet connecting pipe 81 and communicates with its interior. The end is provided with a standard interface for connecting to an external oil outlet pipe, and the angle can be adjusted with the rotation of the oil outlet connecting pipe 81, solving the space arrangement limitation problem of traditional fixed connectors.

[0036] In this embodiment, a first retaining ring 711 is provided at one end of the inlet connecting pipe 71 facing the pump housing 1. The first retaining ring 711 is inserted into the oil inlet hole 3. A first limiting step 712 is provided between the first retaining ring 711 and the inlet connecting pipe 71. The first limiting step 712 abuts against the port of the oil inlet hole 3. A first plug 713 is provided at one end of the inlet connecting pipe 71 away from the first retaining ring 711.

[0037] Specifically, the structure of the inlet connecting pipe 71 is further optimized. A first retaining ring 711 is integrally formed at the end of the inlet connecting pipe 71 facing the pump housing 1. The outer diameter of the first retaining ring 711 is slightly smaller than the inner diameter of the oil inlet hole 3, allowing it to fit precisely inside the oil inlet hole 3 and providing radial positioning. An annular first limiting step 712 is formed between the first retaining ring 711 and the main body of the inlet connecting pipe 71. When the first retaining ring 711 is inserted into the oil inlet hole 3, the first limiting step 712 abuts against the edge of the oil inlet hole 3, limiting the insertion depth of the inlet connecting pipe 71 into the pump chamber 2 and preventing excessive insertion from affecting the normal operation of the gear set 5. A first plug 713 is integrally formed at the end of the inlet connecting pipe 71 away from the first retaining ring 711. The first plug 713 is a solid structure that can seal the end opening of the inlet connecting pipe 71, preventing oil leakage from that end, and simultaneously providing a mounting support surface for the first fastener 72.

[0038] In this embodiment, the first fastener 72 is a hexagonal screw A, which is coaxially mounted on the inlet connecting pipe 71. The hexagonal head of the hexagonal screw A presses against the first plug 713, and the screw of the hexagonal screw A passes through the first plug 713 and is threadedly connected to the pump housing 1.

[0039] Specifically, the first fastener 72 is implemented using a hexagonal screw A. The screw of hexagonal screw A can coaxially pass through the hollow channel of the inlet connecting pipe 71. During assembly, the hexagonal head of hexagonal screw A presses against the outer end face of the first plug 713, and the screw passes through the through hole in the center of the first plug 713 and then connects with the threaded hole on the pump housing 1. By tightening hexagonal screw A, the first plug 713 and the inlet connecting pipe 71 can be pulled towards the pump housing 1, so that the first limiting step 712 is tightly abutted against the port of the oil inlet hole 3, which ensures the fixed reliability of the inlet connecting pipe 71 without affecting its rotational adjustment function after the screw is loosened.

[0040] In this embodiment, a first inlet sealing gasket 74 is fitted on the first retaining ring 711, and the first inlet sealing gasket 74 abuts between the first limiting step 712 and the oil inlet port 3; a second inlet sealing gasket 75 is fitted on the screw of the hexagonal screw A, and the second inlet sealing gasket 75 abuts between the first plug 713 and the hexagonal head of the hexagonal screw A.

[0041] Specifically, to improve the sealing performance of the oil inlet connector 7, a double sealing structure is added. A first annular sealing gasket 74 (made of oil-resistant rubber or metal) is fitted onto the outer circumference of the first retaining ring 711. When the first limiting step 712 abuts against the oil inlet port 3, the first sealing gasket 74 is pressed between the end face of the first limiting step 712 and the oil inlet port 3, forming an axial seal to prevent oil leakage from the gap between the inlet connector 71 and the oil inlet port 3. Simultaneously, a second sealing gasket 75 (also made of oil-resistant sealing material) is fitted onto the screw of the hexagonal screw A. This gasket is located between the outer end face of the first plug 713 and the hexagonal head of the hexagonal screw A. When the screw is tightened, the second sealing gasket 75 is compressed, forming an axial seal to prevent oil from seeping out from the gap between the first plug 713 and the screw. This double sealing structure significantly improves the sealing reliability of the oil inlet.

[0042] In this embodiment, a second retaining ring 811 is provided at one end of the outlet connecting pipe 81 facing the pump housing 1. The second retaining ring 811 is inserted into the oil outlet hole 4. A second limiting step 812 is provided between the second retaining ring 811 and the outlet connecting pipe 81. The second limiting step 812 abuts against the port of the oil outlet hole 4. A second plug 813 is provided at one end of the outlet connecting pipe 81 away from the second retaining ring 811.

[0043] Specifically, a second retaining ring 811 is provided at the end of the outlet connecting pipe 81 facing the pump housing 1. The size of the second retaining ring 811 is adapted to the oil outlet hole 4, and it is inserted into the oil outlet hole 4 to achieve radial positioning. A second limiting step 812 is formed between the second retaining ring 811 and the main body of the outlet connecting pipe 81, which abuts against the port of the oil outlet hole 4 to limit the insertion depth of the outlet connecting pipe 81. A second plug 813 is integrally formed at the end of the outlet connecting pipe 81 away from the second retaining ring 811, which is used to close the end opening and provide installation support for the second fastener 82, ensuring that the oil outlet connector 8 maintains structural stability while achieving the angle adjustment function.

[0044] In this embodiment, the second fastener 82 is a hexagonal screw B, which is coaxially mounted on the connecting pipe 81. The hexagonal head of the hexagonal screw B presses against the second plug 813, and the screw of the hexagonal screw B passes through the second plug 813 and is threadedly connected to the pump housing 1.

[0045] Specifically, hexagonal screw B is coaxially inserted into the outlet connecting pipe 81, with the hexagonal screw head pressing against the second plug 813. The screw rod passes through the second plug 813 and is threaded into the threaded hole on the pump housing 1. By tightening hexagonal screw B, the outlet connecting pipe 81 is fixed to the pump housing 1. When loosened, the outlet connecting pipe 81 can be rotated to adjust the angle of the oil outlet connector 83, thus balancing the reliability of the fixation with the adjustability of the angle.

[0046] In this embodiment, a first sealing gasket 84 is fitted on the second retaining ring 811, and the first sealing gasket 84 abuts between the second limiting step 812 and the oil outlet port 4; a second sealing gasket 85 is fitted on the screw of the hexagonal screw B, and the second sealing gasket 85 abuts between the second plug 813 and the hexagonal head of the hexagonal screw B.

[0047] Specifically, a first sealing gasket 84 is fitted onto the second retaining ring 811 and pressed between the second limiting step 812 and the oil outlet port 4 to achieve axial sealing; a second sealing gasket 85 is fitted onto the screw of the hexagonal screw B and pressed between the second plug 813 and the hexagonal screw head to achieve axial sealing. This double-sealing design effectively prevents oil leakage from the oil outlet, ensuring the reliable operation of the device.

[0048] In this embodiment, the pump housing 1 includes an upper housing 11, a middle housing 12, and a lower housing 13, which are connected and assembled by bolts.

[0049] Specifically, the contact surfaces of the three housing parts are precision machined to ensure a tight fit. During assembly, the three parts are detachably connected and combined using bolts evenly distributed around the circumference to form a complete pump housing 1 structure. This split design facilitates the installation, debugging, and subsequent maintenance of the gear set 5 inside the pump chamber 2. When the gear set 5 is worn or malfunctions, it can be replaced by disassembling the housing without replacing the entire pump housing 1, thus reducing maintenance costs.

[0050] In this embodiment, the cavity wall of the pump chamber 2 and the outer surface of the gear set 5 are both provided with DLC coating.

[0051] Specifically, a DLC (diamond-like carbon) coating is prepared on the inner surface of the pump chamber 2 and the outer surface of the gear set 5 using processes such as physical vapor deposition. This coating has extremely high hardness and excellent self-lubricating properties, which can reduce frictional losses between the gears and the pump chamber 2 wall during gear rotation, as well as between the gears themselves, reducing the generation of wear debris in the oil. At the same time, it improves the corrosion resistance to media such as fuel oil, making it suitable for special working environments such as aviation fuel, extending the service life of the device, and improving mechanical efficiency.

[0052] The beneficial effects of this application include:

[0053] I. Overcoming Space Layout Constraints: The design of rotatable oil inlet connector 7 and oil outlet connector 8 enables 360° adjustment of the oil connector. This overcomes the installation angle limitations of traditional welded / threaded fixed connectors in compact aircraft, adapts to complex airframe piping layouts, and significantly improves space utilization.

[0054] II. Balancing Sealing and Adjustability: A sealing gasket between the retaining ring and the limiting step prevents oil leakage from port 1 of the pump housing; a sealing gasket between the plug and the screw prevents end leakage. The hexagonal screw coaxial fastening design allows for flexible rotation of the joint when loosened, and axial pressure stabilizes and locks the angle when tightened, preventing loosening.

[0055] III. Modular Maintenance Advantages: The connector adopts a detachable installation, which is convenient for quick replacement or repair; the pump housing 1 has a split design (the upper / middle / lower housing is bolted together), which allows for the inspection of the internal gear set 5 without the need for overall disassembly, reducing maintenance costs.

[0056] IV. Extended Service Life: The pump chamber 2 wall and gear set 5 surface are coated with DLC, which has both high hardness and low coefficient of friction, reducing gear wear, improving mechanical efficiency, and extending the service life of key components.

[0057] V. Lightweight and Reliability Enhancement: Optimized pipeline layout can shorten the length of external oil pipes and reduce system weight; the split housing and standardized interface design further enhance the overall structural reliability.

[0058] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0059] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric external gear pump device, characterized in that, include: A pump casing with a pump chamber inside, the pump casing having an oil inlet and an oil outlet that connect to the pump chamber, and a gear set rotatably installed inside the pump chamber for pumping oil from the oil inlet to the oil outlet; The drive motor is fixedly installed on the outside of the pump casing, and its rotating output end is connected to the gear set for driving the rotation of the gear set. An oil inlet connector includes an inlet connecting pipe, a first fastener, and an oil inlet fitting; the inlet connecting pipe is rotatably inserted into the oil inlet hole and coaxially arranged with the oil inlet hole; the first fastener is used to detachably connect the inlet connecting pipe to the pump housing; the oil inlet fitting is fixedly arranged on the side wall of the inlet connecting pipe and communicates with the inside of the inlet connecting pipe, and the oil inlet fitting is used to connect to an external oil inlet pipe; An oil outlet connector includes an oil outlet connecting tube, a second fastener, and an oil outlet fitting; the oil outlet connecting tube is rotatably inserted into the oil outlet hole and is coaxially arranged with the oil outlet hole; the second fastener is used to detachably connect the oil outlet connecting tube to the pump housing; the oil outlet fitting is fixedly arranged on the side wall of the oil outlet connecting tube and communicates with the inside of the oil outlet connecting tube, and the oil outlet fitting is used to connect to an external oil outlet tube.

2. The electric external gear pump device according to claim 1, characterized in that, The inlet connecting pipe is provided with a first retaining ring at one end facing the pump housing. The first retaining ring is inserted into the oil inlet hole. A first limiting step is provided between the first retaining ring and the inlet connecting pipe. The first limiting step abuts against the port of the oil inlet hole. A first plug is provided at the end of the inlet connecting pipe away from the first retaining ring.

3. The electric external gear pump device according to claim 2, characterized in that, The first fastener is a hexagonal screw A, which is coaxially mounted on the inlet connecting pipe. The hexagonal head of the hexagonal screw A presses against the first plug, and the screw rod of the hexagonal screw A passes through the first plug and is threadedly connected to the pump housing.

4. The electric external gear pump device according to claim 3, characterized in that, A first inlet sealing gasket is fitted on the first retaining ring, and the first inlet sealing gasket abuts between the first limiting step and the oil inlet port; a second inlet sealing gasket is fitted on the screw of the hexagonal screw A, and the second inlet sealing gasket abuts between the first plug and the hexagonal head of the hexagonal screw A.

5. The electric external gear pump device according to claim 1, characterized in that, The end of the outlet connecting pipe facing the pump housing is provided with a second retaining ring, which is inserted into the oil outlet hole. A second limiting step is provided between the second retaining ring and the outlet connecting pipe, and the second limiting step abuts against the port of the oil outlet hole. The end of the outlet connecting pipe away from the second retaining ring is provided with a second plug.

6. The electric external gear pump device according to claim 5, characterized in that, The second fastener is a hexagonal screw B, which is coaxially mounted on the connecting pipe. The hexagonal head of the hexagonal screw B presses against the second plug, and the screw of the hexagonal screw B passes through the second plug and is threadedly connected to the pump housing.

7. The electric external gear pump device according to claim 6, characterized in that, The second retaining ring is fitted with a first sealing gasket, which abuts against the second limiting step and the oil outlet port; the screw of the hexagonal screw B is fitted with a second sealing gasket, which abuts against the second plug and the hexagonal head of the hexagonal screw B.

8. The electric external gear pump device according to claim 1, characterized in that, The pump casing includes an upper casing, a middle casing, and a lower casing, which are connected and assembled by bolts.

9. The electric external gear pump device according to claim 1, characterized in that, The pump chamber wall and the outer surface of the gear set are both coated with DLC.

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