Oil way bidirectional controllable booster pump adopting internal meshing structure

Abstract

The invention relates to the field of machinery, in particular to a fluid pump technology. The oil way bidirectional controllable booster pump adopting the internal meshing structure comprises a bidirectional gear pump, the bidirectional gear pump comprises a front shell, a rear pump body and a pump shaft, the oil way bidirectional controllable booster pump further comprises a middle pump body, and gears for driving oil are arranged in cavities of the middle pump body and the rear pump body; the front shell, the middle pump body and the rear pump body are sequentially arranged in series from front to back and share the pump shaft; oil way connectors of the front shell, the middle pump body and the rear pump body are communicated in sequence to form a bidirectional gear pump with a pressurizing effect; the middle pump body and the rear pump body are provided with at least two lubricating oil ways which introduce a high-pressure oil medium from the first connector and the second connector to serve as lubricating oil, and outlets of the at least two lubricating oil ways are located in the side wall of the pump cavity at the contact position of the inner gear ring and the cavity. Therefore, the problem of temperature rise caused by friction between the inner gear ring and the pump cavity is solved.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and in particular to fluid pump technology. Background Art

[0002] The internal meshing bidirectional gear pump is the power element of the hydraulic system. It can directly transmit forward and reverse, has the advantages of strong self-priming ability, low noise, simple structure, affordable price, etc. It can omit the reversing valve and reduce the size of the oil tank. Therefore, it is widely used in metal processing, metallurgical machinery, injection molding machinery, liquid transportation, aerospace and other fields.

[0003] The existing internal meshing bidirectional gear pump can realize bidirectional control of the oil circuit and instantaneous switching direction action, and also has low-speed and high-pressure pressure maintaining action, etc. However, when the internal meshing bidirectional gear pump runs at high speed, the deformation of the inner gear ring increases, and the risk of friction between the inner gear ring and the pump cavity is higher. Once the inner gear ring rubs against the cavity, it will cause the pump body to heat up rapidly, and the temperature rise will cause the friction to become larger until the pump stops working. Therefore, the high speed of the internal meshing bidirectional gear pump is limited, and there are problems such as short service life. Summary of the invention

[0004] The object of the present invention is to provide an oil circuit bidirectional controllable booster pump with an internal meshing structure to solve at least one of the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] The oil circuit bidirectional controllable booster pump adopts an internal meshing structure, including a bidirectional gear pump, the bidirectional gear pump includes a front housing, a rear pump body and a pump shaft, the front housing and the rear pump body are connected in series front and back to form a bidirectional oil pumping gear pump, the front housing and the rear pump body share a pump shaft, and the pump shaft is connected to an external power source; a gear for driving oil is arranged in the pump cavity of the rear pump body, and an intermediate pump body is also included, and a gear for driving oil is arranged in the pump cavity of the intermediate pump body;

[0007] The front housing, the middle pump body and the rear pump body are arranged in series front and back and share a common pump shaft;

[0008] The oil passage interfaces of the front housing, the middle pump body and the rear pump body are sequentially connected to form a bidirectional gear pump with a pressurizing effect;

[0009] The gears for driving the oil are an outer gear and an inner gear ring that mesh with each other, and a crescent plate is also provided between the outer gear and the inner gear ring;

[0010] The oil circuit interface of the rear pump body includes a first interface and a second interface, and the first interface and the second interface of the rear pump body alternately serve as an oil discharge interface and an oil suction interface as the bidirectional gear pump rotates forward and reverse;

[0011] The rear pump body is provided with at least two lubricating oil passages for respectively leading out high-pressure oil medium as lubricating oil from the first interface and the second interface, and the outlets of the at least two lubricating oil passages are located on the side wall of the pump cavity where the inner gear ring of the rear pump body contacts the pump cavity;

[0012] The oil circuit interface of the intermediate pump body includes a first interface and a second interface, and the first interface and the second interface of the intermediate pump body alternately serve as an oil discharge interface and an oil suction interface as the bidirectional gear pump rotates forward and reversely;

[0013] The middle pump body is provided with at least two lubricating oil paths for respectively drawing out high pressure oil medium as lubricating oil from the first interface and the second interface. The outlets of at least two lubricating oil paths are located on the side wall of the pump cavity where the inner gear ring of the middle pump body contacts the pump cavity.

[0014] In the above design, an intermediate pump body is added between the front housing and the rear pump body, and the intermediate pump body is connected to the oil circuit interface of the front housing and the rear pump body. The beneficial effect is that the oil pumping functions of the two pump bodies are superimposed together, thereby increasing the oil pumping pressure of the bidirectional gear pump.

[0015] In the above design, lubricating oil circuits are provided in the middle pump body and the rear pump body, and the middle pump body and the rear pump body are provided with two oil circuit interfaces, namely the first interface and the second interface. With the forward and reverse rotation of the gear pump, the first interface and the second interface are alternately used as the oil discharge port and the oil suction port. Therefore, at least two lubricating oil circuits are provided, and oil is drawn from the first interface and the second interface respectively, so that at least one lubricating oil circuit can be drawn to the high-pressure oil. The opening of the lubricating oil circuit is provided on the side wall of the cavity where the inner gear ring and the pump cavity are in contact, and the drawn high-pressure oil is filled between the inner gear ring and the pump cavity to form a high-pressure oil film, which has the beneficial effect of reducing the friction between the inner gear ring and the pump cavity, reducing the temperature rise of the pump body, increasing the speed of the bidirectional gear pump, and achieving a supercharging effect.

[0016] Furthermore, two oil circuit interfaces are symmetrically arranged on the rear wall of the cavity of the middle pump body and the rear pump body, and both oil circuit interfaces have conical oil guide ports;

[0017] The conical oil guide port includes a large port arranged on the rear wall of the cavity at one side of the cavity, and a small port arranged on the rear wall of the cavity at a side away from the cavity;

[0018] The connection edge between the large mouth and the cavity adopts a smooth curved surface connection, and a streamlined group of protruding particles is arranged at the curved surface connection;

[0019] A group of protruding particles with streamlined edges are arranged in the conical oil guide port;

[0020] Both sides of the crescent plate are covered with a wear-resistant layer, which is made of diamond-like carbon coating;

[0021] The tooth surfaces of the external gear and the internal gear ring are provided with a wear-resistant coating;

[0022] The wear-resistant coating is treated by spraying a surface ceramic coating. The ceramic coating is an aluminum oxide-titanium oxide coating. The thickness of the ceramic coating is 0.3 to 0.5 mm.

[0023] In the above design, two oil circuit interfaces are symmetrically arranged on the rear wall of the cavity of the rear pump body. When the gear pump rotates forward or reversely, the two oil circuit interfaces can serve as oil suction interfaces and oil discharge interfaces for each other, thereby realizing bidirectional controllable oil discharge.

[0024] The streamlined protruding particle group arranged in the conical oil guide port plays the role of buffering and offsetting the high-speed jet at the edge, which can stabilize the oil flow and prevent the high-speed jet at the edge from impacting and damaging the equipment.

[0025] The meniscus plate is covered with a diamond-like carbon coating. Diamond-like carbon (DLC) coating is a soft wear-resistant material coating with high hardness, low friction coefficient and good wear resistance, and can provide excellent surface protection.

[0026] The tooth surfaces of the external gear and the internal gear ring are provided with a ceramic coating, which has high hardness and excellent wear resistance.

[0027] Diamond-like carbon coating and ceramic coating, one is a soft wear-resistant coating and the other is a hard wear-resistant coating. When the two are combined, the hard material and the soft material will not wear each other, so they can each exert their wear-resistant properties.

[0028] Furthermore, the protruding particles of the protruding particle group are provided with one of Teflon coating and carbon fiber coating.

[0029] In the above design, the role of the raised particles is to buffer and offset the effect of the edge high-speed jet. Therefore, coating the surface with a wear-resistant coating such as Teflon coating or carbon fiber coating can reduce the impact and wear of the high-speed jet on the raised particles and extend the service life of the bidirectional controllable booster pump.

[0030] Furthermore, the lubricating oil circuit includes an oil inlet hole, one end of which is open to connect to the high-pressure oil interface of the two-way pump oil circuit, and the other end of which is open to the outer wall of the shell, and an oil inlet hole plug is provided near the outer wall of the shell to block the oil inlet hole;

[0031] It also includes an oil inlet hole, one end of which is opened on the side wall of the pump body where the inner gear ring and the pump body contact, and the other end of which is opened to the outer wall of the shell, and an oil inlet plug is provided near the outer wall of the shell to block the oil inlet hole;

[0032] It also includes a bridging oil hole, which passes through the oil introduction hole and the oil inlet hole in sequence, and then guides the high-pressure pump oil through the oil introduction hole, the bridging oil hole and the oil inlet hole to form a lubricating oil film between the inner gear ring and the pump body.

[0033] In the above design, a bridging method is adopted. In the bridging method, there are two radially opened channels, and the two channels are connected to the oil circuit interface and the side wall of the cavity respectively, and then the two are connected through an axial channel to realize the high-pressure oil being guided from the oil circuit interface to the contact point between the inner gear ring and the pump cavity, providing a high-pressure oil film for the friction area between the inner gear ring and the pump cavity. The beneficial effect is to reduce friction, reduce heat, and increase the service life of the gear pump.

[0034] Furthermore, the aperture of the lubricating oil passage is 0.5 to 1.5 mm.

[0035] In the above design, the lubricating oil circuit adopts a small aperture, which has the beneficial effect of reducing oil return and improving the working efficiency of the gear pump.

[0036] Furthermore, the tooth profile of the external gear is a straight line, and the tooth profile of the matching internal gear ring is a conjugate tooth profile meshing with the straight tooth profile of the external gear.

[0037] In the above design, the outer gear and the inner gear ring adopt a linear conjugate internal meshing tooth shape, which makes the meshing volume very small and avoids the influence of oil entrapment. The beneficial effect is that the noise and pressure pulsation of the pump are greatly reduced, and the noise can be kept low even when the pressure is increased.

[0038] Furthermore, the bearing sleeve is made of a mixed material consisting of micron-sized SiC and Al2O3 powder particles filled in bisphenol A epoxy resin.

[0039] In the above design, the bearing sleeve made of a mixed material consisting of micron-sized SiC and Al2O3 powder particles filled in bisphenol A epoxy resin has an extremely low friction coefficient, which has the beneficial effect of increasing the rotation speed of the gear pump and achieving a higher pump oil pressure.

[0040] Furthermore, annular sealing grooves are provided at the bottom end of the front housing, the top end of the rear pump body, and both ends of the middle pump body, and O-rings are installed in the sealing grooves.

[0041] In the above design, in order to ensure the sealing of the interconnected parts of the shells, an annular sealing groove is opened on the interconnected end faces, and an O-ring is installed in the annular sealing groove to further prevent leakage of the oil medium.

[0042] In a further optimization, the O-ring is a flexible metal sealing ring made of flexible metal, and a part of the flexible metal sealing ring protrudes out of the annular groove of the pipeline.

[0043] In the above design, the O-ring is a flexible metal sealing ring made of flexible metal, which utilizes the property of the flexible metal to fit tightly in the annular groove after deformation, thereby improving the sealing performance of the high-pressure oil medium in the pump.

[0044] The present invention adds an intermediate pump body between the front housing and the rear pump body, and the oil circuit interfaces of the intermediate pump body and the rear pump body are bidirectionally connected. The beneficial effect is that the pumping oil effects of the two housings are superimposed on each other, thereby increasing the pumping oil pressure of the bidirectional gear pump.

[0045] The present invention provides lubricating oil circuits in the intermediate pump body and the rear pump body respectively, and guides the high-pressure oil to the outer circle of the inner gear ring and the cavity through the lubricating oil circuit to form a high-pressure oil film. The beneficial effect is that the friction between the inner gear ring and the pump cavity is reduced, the temperature rise of the pump body is reduced, the rotation speed of the bidirectional gear pump is increased, and the boosting effect is achieved.

[0046] The beneficial effect of the present invention is that the diamond-like carbon coating made of soft material is covered on the crescent plate, and the ceramic coating made of hard material is arranged on the tooth surface of the outer gear and the inner gear ring. The two wear-resistant layers of different properties are combined, and the two will not wear each other, so that each can play its own wear-resistant characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0048] Figure 1 This is the appearance diagram of a bidirectional controllable booster pump with an internal meshing structure;

[0049] Figure 2 It is a cross-sectional view of a bidirectional controllable booster pump;

[0050] Figure 3 It is a transverse cross-sectional view of the middle pump body;

[0051] Figure 4 It is a schematic diagram of the pump chamber of the middle pump body;

[0052] Figure 5 Schematic diagram of the lubrication oil circuit.

[0053] Explanation of symbols:

[0054] 1. Pump shaft; 2. Front housing; 3. Intermediate pump body; 4. Rear pump body; 5. Oil inlet and outlet; 6. Oil inlet and outlet; 7. Lubricating oil circuit; 9. External gear; 10. Internal gear ring; 11. Crescent plate; 12. Oil circuit interface; 70. Oil inlet hole; 71. Oil inlet hole plug; 72. Oil inlet hole; 73. Oil inlet hole plug; 74. Bridging oil hole. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0057] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0058] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0059] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the oil circuit bidirectional controllable booster pump adopts an internal meshing structure, including a bidirectional gear pump, the bidirectional gear pump includes a front housing 2, a rear pump body 4 and a pump shaft 1, the front housing 2 and the rear pump body 4 are sequentially connected in series front and back to form a bidirectional oil pumping gear pump, the front housing 2 and the rear pump body 4 share the pump shaft 1, and the pump shaft 1 is connected to an external power; a gear for driving oil is arranged in the pump cavity of the rear pump body 4, and an intermediate pump body 3 is also included, and a gear for driving oil is arranged in the pump cavity of the intermediate pump body 3;

[0060] The front housing 2, the middle pump body 3 and the rear pump body 4 are arranged in series in sequence front to back and share a pump shaft 1;

[0061] The oil passage interfaces 12 of the front housing 2, the middle pump body 3 and the rear pump body 4 are sequentially connected to form a bidirectional gear pump with a pressurizing effect;

[0062] The gears for driving the oil are an outer gear 9 and an inner gear ring 10 meshing with each other, and a crescent plate 11 is also provided between the outer gear 9 and the inner gear ring 10;

[0063] The oil circuit interface 12 of the rear pump body 4 includes a first interface and a second interface. The first interface and the second interface of the rear pump body 4 alternately serve as an oil discharge interface and an oil suction interface as the bidirectional gear pump rotates forward and reversely.

[0064] The rear pump body 4 is provided with at least two lubricating oil passages 7 for respectively leading out high-pressure oil medium as lubricating oil from the first interface and the second interface, and the outlets of at least two lubricating oil passages 7 are located on the side wall of the pump cavity where the inner gear ring 10 of the rear pump body 4 contacts the pump cavity;

[0065] The oil circuit interface 12 of the intermediate pump body 3 includes a first interface and a second interface. The first interface and the second interface of the intermediate pump body 3 alternately serve as an oil discharge interface and an oil suction interface as the bidirectional gear pump rotates forward and reversely.

[0066] The intermediate pump body 3 is provided with at least two lubricating oil circuits 7 for respectively drawing out high-pressure oil medium as lubricating oil from the first interface and the second interface. The outlets of at least two lubricating oil circuits 7 are located on the side wall of the pump cavity where the inner gear ring 10 of the intermediate pump body 3 contacts the pump cavity.

[0067] In this embodiment, the front housing 2 of the bidirectional gear pump is provided with an oil inlet and outlet 5, and the rear pump body 4 is provided with an oil inlet and outlet 6. When the gear pump is rotated forward or reverse, the oil inlet and outlet 5 and the oil inlet and outlet 6 alternately become the oil inlet and the oil outlet.

[0068] An intermediate pump body 3 is added between the front housing 2 and the rear pump body 4. The intermediate pump body 3 is connected to the oil circuit interface 12 of the front housing 2 and the rear pump body 4. The beneficial effect is that the oil pumping functions of the two pump bodies are superimposed together, thereby increasing the oil pumping pressure of the bidirectional gear pump.

[0069] In this embodiment, the lubricating oil circuit 7 is provided in both the middle pump body 3 and the rear pump body 4. The middle pump body 3 and the rear pump body 4 are provided with two oil circuit interfaces 12, namely the first interface and the second interface. With the forward and reverse rotation of the gear pump, the first interface and the second interface are alternately used as the oil discharge port and the oil suction port. Therefore, at least two lubricating oil circuits 7 are provided, and oil is drawn from the first interface and the second interface respectively, so that at least one lubricating oil circuit 7 can be drawn to the high-pressure oil. The opening of the lubricating oil circuit 7 is provided on the side wall of the cavity where the inner gear ring 10 and the pump cavity are in contact. The drawn high-pressure oil fills the space between the inner gear ring 10 and the pump cavity to form a high-pressure oil film. The beneficial effect is that the friction between the inner gear ring 10 and the pump cavity is reduced, the temperature rise of the pump body is reduced, the speed of the bidirectional gear pump is increased, and the supercharging effect is achieved.

[0070] Reference Figure 4 As shown, two oil circuit interfaces 12 are symmetrically arranged on the rear wall of the cavity of the middle pump body 3 and the rear pump body 4, and both oil circuit interfaces 12 have conical oil guide ports;

[0071] The conical oil guide port includes a large port arranged on the rear wall of the cavity at one side of the cavity, and a small port arranged on the rear wall of the cavity at a side away from the cavity;

[0072] The connection edge between the large mouth and the cavity adopts a smooth curved surface connection, and a streamlined group of protruding particles is arranged at the curved surface connection;

[0073] A group of protruding particles with streamlined edges are arranged in the conical oil guide port;

[0074] Both the front and back sides of the crescent plate 11 are covered with a wear-resistant layer, and the wear-resistant layer adopts a diamond-like carbon coating;

[0075] The tooth surfaces of the external gear 9 and the internal gear ring 10 are provided with a wear-resistant coating;

[0076] The wear-resistant coating is treated by spraying a surface ceramic coating. The ceramic coating is an aluminum oxide-titanium oxide coating. The thickness of the ceramic coating is 0.3 to 0.5 mm.

[0077] In this embodiment, two oil circuit interfaces 12 are symmetrically arranged on the rear wall of the cavity of the rear pump body 4. When the gear pump rotates forward or reversely, the two oil circuit interfaces 12 can serve as oil suction interfaces and oil discharge interfaces to each other, thereby realizing bidirectional controllable oil discharge.

[0078] The streamlined protruding particle group arranged in the conical oil guide port plays the role of buffering and offsetting the high-speed jet at the edge, which can stabilize the oil flow and prevent the high-speed jet at the edge from impacting and damaging the equipment.

[0079] The crescent plate 11 is covered with a diamond-like carbon coating. The diamond-like carbon (DLC) coating is a soft wear-resistant material coating with high hardness, low friction coefficient and good wear resistance, and can provide excellent surface protection.

[0080] The tooth surfaces of the external gear 9 and the internal gear ring 10 are provided with a ceramic coating, which has high hardness and excellent wear resistance.

[0081] Diamond-like carbon coating and ceramic coating, one is a soft wear-resistant coating and the other is a hard wear-resistant coating. When the two are combined, the hard material and the soft material will not wear each other, so they can each exert their wear-resistant properties.

[0082] Furthermore, the protruding particles of the protruding particle group are provided with one of Teflon coating and carbon fiber coating.

[0083] In this embodiment, the role of the raised particles is to buffer and offset the effect of the edge high-speed jet. Therefore, coating their surface with a wear-resistant coating such as Teflon coating or carbon fiber coating can reduce the impact and wear of the high-speed jet on the raised particles and extend the service life of the bidirectional controllable booster pump.

[0084] Reference Figure 5As shown, the lubricating oil circuit 7 includes an oil inlet hole 70, one end of the oil inlet hole 70 is opened to communicate with the high-pressure oil interface of the two-way pump oil circuit, and the other end of the oil inlet hole 70 is opened to the outer wall of the shell, and an oil inlet hole plug 71 for sealing the oil inlet hole 70 is provided near the outer wall of the shell;

[0085] It also includes an oil inlet hole 72, one end of which is opened on the side wall of the pump body where the inner gear ring 10 contacts the pump body, and the other end of which is opened to the outer wall of the shell. An oil inlet plug 73 is provided near the outer wall of the shell to block the oil inlet hole 72.

[0086] It also includes a bridging oil hole 74, which passes through the oil introduction hole 70 and the oil inlet hole 72 in sequence, and then guides the high-pressure pump oil through the oil introduction hole 70, the bridging oil hole 74, and the oil inlet hole 72 to form a lubricating oil film between the inner gear ring 10 and the pump body.

[0087] In this embodiment, a bridging method is adopted, in which there are two radially opened channels, the two channels respectively connect the oil circuit interface 12 and the side wall of the cavity, and then connect the two through an axial channel, so as to guide the high-pressure oil from the oil circuit interface 12 to the contact point between the inner gear ring 10 and the pump cavity, and provide a high-pressure oil film for the friction area between the inner gear ring 10 and the pump cavity. The beneficial effect is to reduce friction, reduce heat, and increase the service life of the gear pump.

[0088] Furthermore, the hole diameter of the lubricating oil passage 7 is 0.5 to 1.5 mm.

[0089] In this embodiment, the lubricating oil passage 7 adopts a small aperture, which has the beneficial effect of reducing oil return and improving the working efficiency of the gear pump.

[0090] Reference Figure 3 As shown, the tooth profile of the external gear 9 is a straight line, and the tooth profile of the internal gear ring 10 matching therewith is a conjugate tooth profile meshing with the straight tooth profile of the external gear 9 .

[0091] In this embodiment, the outer gear 9 and the inner gear ring 10 adopt a linear conjugate internal meshing tooth shape, which makes the meshing volume very small and avoids the influence of oil entrapment. The beneficial effect is that the noise and pressure pulsation of the pump are greatly reduced, and the noise can be maintained at a low level even when the pressure is increased.

[0092] Furthermore, the bearing sleeve is made of a mixed material consisting of micron-sized SiC and Al2O3 powder particles filled in bisphenol A epoxy resin.

[0093] In this embodiment, the bearing sleeve made of a mixed material consisting of micron-sized SiC and Al2O3 powder particles filled in bisphenol A epoxy resin has an extremely low friction coefficient, which has the beneficial effect of increasing the rotation speed of the gear pump and achieving a higher pump oil pressure.

[0094] Furthermore, the bottom end of the front housing 2, the top end of the rear pump body 4, and both ends of the middle pump body 3 are all provided with annular sealing grooves, and O-rings are installed in the sealing grooves.

[0095] In this embodiment, in order to ensure the sealing of the interconnected parts of the shells, an annular sealing groove is opened on the interconnected end faces, and an O-ring is installed in the annular sealing groove to further prevent leakage of the oil medium.

[0096] In a further optimization, the O-ring is a flexible metal sealing ring made of flexible metal, and a part of the flexible metal sealing ring protrudes out of the annular groove of the pipeline.

[0097] In this embodiment, the O-ring is a flexible metal sealing ring made of flexible metal, which utilizes the property of the flexible metal to fit tightly in the annular groove after deformation, thereby improving the sealing performance of the high-pressure oil medium in the pump.

[0098] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, ie, those features that are not relevant to the best mode of the invention or those features that are not relevant to implementing the invention.

[0099] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An oil circuit bidirectional controllable booster pump with an internal meshing structure includes a bidirectional gear pump, which includes a front housing, a rear pump body and a pump shaft. The front housing and the rear pump body are connected in series front and back to form a bidirectional oil pumping gear pump. The front housing and the rear pump body share a pump shaft, and the pump shaft is connected to an external power source. A gear for driving oil is arranged in the pump cavity of the rear pump body, and the characteristics are as follows: It also includes an intermediate pump body, in which a gear driving oil is arranged in a pump cavity; The front housing, the middle pump body and the rear pump body are arranged in series front to back and share a common pump shaft; The oil passage interfaces of the front housing, the middle pump body and the rear pump body are sequentially connected to form a bidirectional gear pump with a pressurizing effect; The gears for driving the oil are an outer gear and an inner gear ring that mesh with each other, and a crescent plate is also provided between the outer gear and the inner gear ring; The oil circuit interface of the rear pump body includes a first interface and a second interface, and the first interface and the second interface of the rear pump body alternately serve as an oil discharge interface and an oil suction interface as the bidirectional gear pump rotates forward and reverse; The rear pump body is provided with at least two lubricating oil passages for respectively leading out high-pressure oil medium as lubricating oil from the first interface and the second interface, and the outlets of the at least two lubricating oil passages are located on the side wall of the pump cavity where the inner gear ring of the rear pump body contacts the pump cavity; The oil circuit interface of the intermediate pump body includes a first interface and a second interface, and the first interface and the second interface of the intermediate pump body alternately serve as an oil discharge interface and an oil suction interface as the bidirectional gear pump rotates forward and reverse; The middle pump body is provided with at least two lubricating oil paths for respectively drawing out high pressure oil medium as lubricating oil from the first interface and the second interface. The outlets of at least two lubricating oil paths are located on the side wall of the pump cavity where the inner gear ring of the middle pump body contacts the pump cavity.

2. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 1, characterized in that: Two oil circuit interfaces are symmetrically arranged on the rear wall of the cavity of the middle pump body and the rear pump body, and both oil circuit interfaces have conical oil guide ports; The conical oil guide port comprises a large port arranged on the rear wall of the cavity at one side of the cavity, and a small port arranged on the rear wall of the cavity at a side away from the cavity; The connection edge between the large mouth and the cavity adopts a smooth curved surface connection, and a streamlined group of protruding particles is arranged at the curved surface connection; A group of protruding particles with streamlined edges are arranged in the conical oil guide port; Both sides of the crescent plate are covered with a wear-resistant layer, which is made of diamond-like carbon coating; The tooth surfaces of the external gear and the internal gear ring are provided with a wear-resistant coating; The wear-resistant coating is treated by spraying a surface ceramic coating, the ceramic coating is an aluminum oxide-titanium oxide coating, and the thickness of the ceramic coating is 0.3 to 0.5 mm.

3. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 2, characterized in that: The protrusion particles of the protrusion particle group are provided with one of Teflon coating and carbon fiber coating.

4. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 1, characterized in that: The lubricating oil circuit includes an oil inlet hole, one end of which is open to connect to the high-pressure oil interface of the two-way pump oil circuit, and the other end of which is open to the outer wall of the shell, and an oil inlet hole plug is provided near the outer wall of the shell to block the oil inlet hole; It also includes an oil inlet hole, one end of which is opened on the side wall of the pump body where the inner gear ring and the pump body contact, and the other end of which is opened to the outer wall of the shell, and an oil inlet plug is provided near the outer wall of the shell to block the oil inlet hole; It also includes a bridging oil hole, which passes through the oil introduction hole and the oil inlet hole in sequence, and then guides the high-pressure pump oil through the oil introduction hole, the bridging oil hole and the oil inlet hole to form a lubricating oil film between the inner gear ring and the pump body.

5. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 1, characterized in that: The aperture of the lubrication oil circuit is 0.5 to 1.5 mm.

6. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 1, characterized in that: The tooth profile of the external gear is a straight line, while the tooth profile of the matching internal gear ring is a conjugate tooth profile meshing with the straight tooth profile of the external gear.

7. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 1, characterized in that: The bearing sleeve is made of a mixed material consisting of micron-sized SiC and Al2O3 powder particles filled in bisphenol A epoxy resin.

8. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 1, characterized in that: The bottom end of the front housing, the top end of the rear pump body and both ends of the middle pump body are all provided with annular sealing grooves, and O-type sealing rings are installed in the sealing grooves.

9. The oil circuit bidirectional controllable booster pump with an internal meshing structure according to claim 8, characterized in that: The O-type sealing ring is a flexible metal sealing ring made of flexible metal, and a part of the flexible metal sealing ring protrudes outside the annular groove of the pipeline.

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