An axial pump

Abstract

This application discloses an axial pump, comprising a main shaft, a swashplate, a first pressure ball bearing, multiple piston pumps, a cylinder block, and a switching valve. The main shaft is connected to a power source; the swashplate is connected to and coaxially arranged with the main shaft; the first pressure ball bearing is located on the side of the swashplate away from the main shaft; one end of each piston pump is connected to the lower end face of the first pressure ball bearing on the side away from the swashplate. The piston pump includes a high-pressure piston and a low-pressure piston, and the centerline of the area enclosed by the high-pressure and low-pressure pistons coincides with the centerline of the main shaft; the cylinder block is designed around the piston pumps and has an oil chamber, which is connected to the piston pumps; the switching valve connects the high-pressure and low-pressure pistons. When the pressure is greater than a threshold, the switching valve closes, preventing oil from the low-pressure piston from entering the high-pressure oil circuit of the high-pressure piston; when the pressure is less than the threshold, the switching valve opens, allowing oil from the low-pressure piston to enter the high-pressure oil circuit of the piston pump. This application achieves the pressure switching capability of the axial pump through the design of the switching valve.

Description

Technical Field

[0001] This application relates to the field of axial pump technology, and in particular to an axial pump. Background Technology

[0002] In current axial pumps, the piston axis is parallel to the centerline of the main shaft at the drive end. It is also a reciprocating pump, achieving oil suction and discharge through the reciprocating motion of the piston. Furthermore, the pump's displacement can be adjusted by changing the tilt angle of the swashplate, achieving variable displacement control. Currently, it is mainly used in scenarios requiring high pressure and high-precision flow control, such as hydraulic systems in engineering machinery, marine propulsion systems, or high-pressure fluid transmission systems in industrial equipment.

[0003] There is an urgent need to optimize the design of axial pumps to further reduce installation space and make them suitable for use in various scenarios. Utility Model Content

[0004] This application primarily provides an axial pump that allows for a smaller installation space.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows: An axial pump is provided, comprising a main shaft, a swashplate, a first pressure ball bearing, multiple piston pumps, a cylinder block, and a switching valve. The main shaft is connected to a power source; the swashplate is connected to and coaxially arranged with the main shaft; the first pressure ball bearing is located on the side of the swashplate away from the main shaft; one end of each of the multiple piston pumps is connected to the lower end face of the first pressure ball bearing on the side away from the swashplate; the multiple piston pumps include high-pressure pistons and low-pressure pistons, and the centerline of the area enclosed by the high-pressure pistons and the low-pressure pistons coincides with the centerline of the main shaft; the cylinder block is designed around the piston pumps, and the cylinder block has an oil chamber, which is connected to the piston pumps; the switching valve connects the high-pressure pistons and the low-pressure pistons. When the pressure is greater than a threshold, the switching valve closes, preventing oil in the low-pressure pistons from entering the high-pressure oil circuit of the high-pressure pistons; when the pressure is less than the threshold, the switching valve opens, allowing oil in the low-pressure pistons to enter the high-pressure oil circuit of the piston pumps.

[0006] The axial pump also includes a suction check valve. Part of the suction check valve is connected to the low-pressure plunger, and part of the suction check valve is connected to the high-pressure plunger. The suction check valve is located between the low-pressure plunger and the cylinder, or between the high-pressure plunger and the cylinder, and communicates with the oil chamber.

[0007] The low-pressure plunger includes a first inlet section, a first connecting section, and a first outlet section. One end of the first inlet section is connected to the first pressure ball bearing; one end of the first connecting section is connected to the other end of the first inlet section; the first outlet section is located on the side of the first connecting section away from the first inlet section, and one end is connected to the other end of the first connecting section; the connection direction of the first inlet section, the first connecting section, and the first outlet section is parallel to the centerline of the spindle.

[0008] The axial pump also includes a low-pressure oil outlet check valve, located on the side of the first oil outlet section near the first connecting section, connecting the first oil outlet section and the first connecting section.

[0009] The low-pressure plunger also includes a first overflow valve, one end of which is connected to the first oil outlet valve and the other end of which is connected to the oil chamber.

[0010] The high-pressure plunger includes a second oil inlet section, a second connecting section, and a second oil outlet section. One end of the second oil inlet section is connected to the first pressure ball bearing; one end of the second connecting section is connected to the other end of the second oil inlet section; the second oil outlet section is located on the side of the second connecting section away from the second oil inlet section, and one end is connected to the other end of the second connecting section; the connection direction of the second oil inlet section, the second connecting section, and the second oil outlet section is parallel to the centerline of the main shaft.

[0011] The axial pump also includes a high-pressure oil outlet check valve, located on the side of the second oil outlet section near the second connecting section, connecting the second oil outlet section and the second connecting section.

[0012] The high-pressure plunger also includes a second overflow valve, one end of which is connected to the second oil outlet valve and the other end of which is connected to the oil chamber.

[0013] The switching valve includes a confluence end, a confluence section, and a switching valve body. The confluence end is connected to multiple first oil outlet sections, and the confluence section is connected to the confluence end and simultaneously connected to the second oil outlet section of the high-pressure plunger. The switching valve body is located on the side of the confluence section near the confluence end and is used to control the liquid in the first oil outlet section to enter the second oil outlet section.

[0014] The axial pump also includes a plunger seat, through which the high-pressure plunger and the low-pressure plunger pass to fix their relative positions. The high-pressure plunger and the low-pressure plunger move in a direction perpendicular to the plunger seat.

[0015] The beneficial effects of this application are as follows: In the axial pump of this application, by combining the first pressure ball bearing with the swashplate structure, the overall radial space occupied by the axial pump can be reduced, making the equipment more suitable for scenarios with limited installation space. Integrating the switching valve and the plunger pump into a small cylinder body simplifies the assembly process and reduces machining difficulty. The design of aligning the centerlines of the low-pressure plunger and the high-pressure plunger with the main shaft ensures stable plunger movement trajectory and reduces mechanical wear. The switching valve automatically controls the oil circuit opening and closing according to pressure changes, realizing the pressure switching capability of the axial pump and improving system adaptability. At the same time, the cylinder body design makes it difficult for small particles to enter critical parts, reducing the failure rate and extending equipment life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is a schematic diagram of one embodiment of the axial pump in this application;

[0018] Figure 2 for Figure 1 A schematic diagram of a central axial pump from another perspective, representing one embodiment.

[0019] Figure 3 For along Figure 2 A cross-sectional structural schematic diagram of one embodiment of AA';

[0020] Figure 4 for Figure 1 A schematic diagram of one embodiment of the switching valve.

[0021] Explanation of reference numerals in the attached drawings: 100 Axial pump; 11 Swashplate; 12 First pressure ball bearing; 13 Piston pump; 131 High-pressure plunger; 1311 Second inlet section; 1312 Second connecting section; 1313 Second outlet section; 132 Low-pressure plunger; 1321 First inlet section; 1322 First connecting section; 1323 First outlet section; 14 Cylinder block; 15 Switching valve; 151 Manifold; 152 Manifold; 153 Switching valve body; 154 Overflow port; 16 Suction check valve; 17 Second pressure ball bearing; 18 First relief valve; 19 High-pressure outlet check valve; 20 Second relief valve; 21 Piston seat. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4This application provides an axial pump 100, which includes a main shaft 10, a swashplate 11, a first pressure ball bearing 12, a plurality of plunger pumps 13, a cylinder block 14, and a switching valve 15. The main shaft 10 is connected to a power source; the swashplate 11 is connected to the main shaft 10 and coaxially arranged; the first pressure ball bearing 12 is located on the side of the swashplate 11 away from the main shaft 10; one end of each of the plurality of plunger pumps 13 is connected to the lower end face of the first pressure ball bearing 12 on the side away from the swashplate 11; the plurality of plunger pumps 13 include a high-pressure plunger 131 and a low-pressure plunger 132. The centerline of the area enclosed by plunger 131 and low-pressure plunger 132 coincides with the centerline of spindle 10; cylinder block 14 is designed around plunger pump 13, cylinder block 14 has an oil chamber, plunger pump 13 and oil chamber are connected; switching valve 15 connects high-pressure plunger 131 and low-pressure plunger 132. When the pressure is greater than the threshold, switching valve 15 is closed, and oil in low-pressure plunger 132 cannot enter the high-pressure oil circuit of high-pressure plunger 131; when the pressure is less than the threshold, switching valve 15 is opened, and oil in low-pressure plunger 132 enters the high-pressure oil circuit of plunger pump 13.

[0028] Specifically, the main shaft 10 is used to connect to the power source. The swashplate 11 is coaxially arranged and connected to the main shaft 10. The power source drives the main shaft 10 to rotate, and the rotation of the main shaft 10 drives the swashplate 11 to rotate. The first pressure ball bearing 12 is located on the side of the swashplate 11 away from the main shaft 10, and is used to support the rotational movement of the swashplate 11. One end of multiple plunger pumps 13 is connected to the lower end face of the first pressure ball bearing 12. The center lines of the high-pressure plunger 131 and the low-pressure plunger 132 coincide with the center line of the main shaft 10 to ensure uniform force distribution. Among them, the high-pressure plunger 131 is mainly used in high-pressure systems, with a working pressure usually greater than 100MPa, and can be applied to high-pressure liquid transportation and other scenarios. The low-pressure plunger 132 is suitable for low-pressure systems, with a working pressure generally less than 10MPa, and is often used for low-pressure liquid transportation. The cylinder body 14 is designed around the plunger pump 13 and includes an oil chamber. The plunger pump 13 is connected to the oil chamber to realize the oil inlet and outlet of the plunger pump 13. The switching valve 15 connects the high-pressure plunger 131 and the low-pressure plunger 132. When the pressure exceeds a threshold, the switching valve 15 closes, preventing oil from the low-pressure plunger 132 from entering the high-pressure oil circuit of the high-pressure plunger 131. When the pressure is below the threshold, the switching valve 15 opens, allowing oil from the low-pressure plunger 132 to enter the high-pressure oil circuit. By combining the first pressure ball bearing 12 with the swashplate 11 structure, the radial space occupied by the axial pump 100 as a whole can be reduced, making the equipment more suitable for scenarios with limited installation space. Integrating the switching valve 15 and the plunger pump 13 into the small cylinder block 14 simplifies the assembly process and reduces machining difficulty. The design of aligning the centerlines of the low-pressure plunger 132 and the high-pressure plunger 131 with the main shaft 10 ensures stable plunger movement trajectory and reduces mechanical wear. The switching valve 15 automatically controls the oil circuit opening and closing according to pressure changes, realizing the pressure switching capability of the axial pump 100 and improving system adaptability. At the same time, the design of the cylinder block 14 makes it difficult for small particles to enter critical parts, reducing the failure rate and extending the equipment life.

[0029] Please continue reading. Figure 1 The axial pump 100 also includes a second pressure ball bearing 17, which is connected to the main shaft 10 and located between the main shaft 10 and the swashplate 11. The design of the second pressure ball bearing 17 improves the motion stability of the swashplate 11.

[0030] Please continue reading. Figure 1The axial pump 100 also includes a suction check valve 16. Part of the suction check valve 16 is connected to the low-pressure plunger 132, and part of the suction check valve 16 is connected to the high-pressure plunger 131. The suction check valve 16 is located between the low-pressure plunger 132 and the cylinder 14, or between the high-pressure plunger 131 and the cylinder 14, and communicates with the oil chamber. Specifically, the suction check valve 16 is connected to the low-pressure plunger 132 or the high-pressure plunger 131, and this check valve is located between the plunger and the cylinder 14 and communicates with the oil chamber. The suction check valve 16 can be integrated between the low-pressure plunger 132 or the high-pressure plunger 131 and the cylinder 14 to achieve the connection between the suction check valve 16 and the oil chamber, facilitating the entry of oil in the oil chamber into the low-pressure plunger 132 or the high-pressure plunger 131 via the suction check valve 16. The design of the suction check valve 16 achieves one-way flow between the oil chamber and the plunger pump 13. In practical implementation, a metal or ceramic valve core can be used, with the valve opening and closing achieved by a spring or magnet. The installation position of the suction check valve 16 can be selected between the mating surfaces of the low-pressure plunger 132 and the cylinder body 14, or between the mating surfaces of the high-pressure plunger 131 and the cylinder body 14. By directly integrating the suction check valve 16 with the low-pressure plunger 132 and the high-pressure plunger 131, the overall radial dimension of the axial pump 100 can be effectively reduced, thus lowering the installation space requirement. This structural design shortens the oil flow path, reduces resistance losses caused by oil passing through additional pipelines, and avoids assembly errors associated with traditional split structures. The linkage between the suction check valve 16 and the plunger pump 13 improves oil control accuracy and reduces the probability of failures caused by small particulate matter jamming. Due to the integrated design of the cylinder body 14 and the plunger, the number of parts is reduced, the assembly process is simplified, thereby improving product reliability and reducing manufacturing costs.

[0031] Please continue reading. Figure 2The low-pressure plunger 132 includes a first oil inlet section 1321, a first connecting section 1322, and a first oil outlet section 1323. One end of the first oil inlet section 1321 is connected to the first pressure ball bearing 12. One end of the first connecting section 1322 is connected to the other end of the first oil inlet section 1321. The first oil outlet section 1323 is located on the side of the first connecting section 1322 away from the first oil inlet section 1321, and one end is connected to the other end of the first connecting section 1322. The connection direction of the first oil inlet section 1321, the first connecting section 1322, and the first oil outlet section 1323 is parallel to the center line of the main shaft 10. Specifically, the low-pressure plunger 132 consists of three functional sections. One end of the first oil inlet section 1321 is connected to the first pressure ball bearing 12, and the side of the first oil inlet section 1321 near the cylinder block 14 is connected to the suction check valve 16 for oil inlet. One end of the first connecting section 1322 is connected to the first oil inlet section 1321, and the other end of the first connecting section 1322 is connected to one end of the first oil outlet section 1323. The connection direction of the three functional sections is parallel to the centerline of the main shaft 10. The low-pressure plunger 132 can be integrally formed from metal material, or it can be a separate structure achieved through welding or threaded connection. The connection between the first oil inlet section 1321 and the first pressure ball bearing 12 can be direct contact or a connection through a transition piece. In one embodiment, the axial length ratio of the three functional sections can be adjusted according to the pump's flow requirements, and the diameter of each section can also be optimized according to pressure changes. By aligning the three functional sections of the low-pressure plunger 132 with the centerline of the main shaft 10, the axial space occupied by the pump can be effectively reduced, resulting in a compact overall structure. This design allows for a more direct connection between the low-pressure plunger 132 and the first pressure ball bearing 12, reducing assembly complexity and improving machining efficiency. Furthermore, the parallel connection direction with the centerline of the main shaft 10 enhances the stability of the plunger's movement, reduces oil flow resistance, and improves sealing performance.

[0032] Please continue reading. Figure 2The axial pump 100 also includes a low-pressure oil outlet check valve, located on the side of the first oil outlet section 1323 near the first connecting section 1322, connecting the first oil outlet section 1323 and the first connecting section 1322. Specifically, the low-pressure oil outlet check valve is positioned between the first oil outlet section 1323 and the first connecting section 1322, and controls the direction of oil flow through its unidirectional conduction characteristic. This check valve can employ a spring-loaded valve core structure or a magnetically adsorbed valve core structure, and the valve body material can be metal or high-strength engineering plastic. The valve port position forms a mechanical connection with the flow channels of the first oil outlet section 1323 and the first connecting section 1322. When the oil pressure reaches a set value, the valve core opens; when it falls below the set value, it automatically closes. In specific implementations, an integral valve body structure or a split assembly structure can be adopted, and the valve core surface can be coated with a wear-resistant coating to improve service life. By setting the low-pressure oil outlet check valve, backflow of oil can be effectively prevented when the low-pressure plunger 132 stops working, maintaining system pressure stability. This structural design optimizes the oil flow path and reduces energy loss caused by pressure fluctuations. The low-pressure outlet check valve reduces the reliance on other pressure control components in the axial pump 100, simplifying the overall structure. The integrated design of the valve body and flow channel saves installation space and prevents the direct entry of fine particles into critical moving parts, improving equipment reliability. This arrangement also makes oil delivery more efficient, contributing to improved overall pump efficiency.

[0033] Please continue reading. Figure 1The low-pressure plunger 132 also includes a first relief valve 18, one end of which is connected to the first oil outlet valve, and the other end of which is connected to the oil chamber. Specifically, the low-pressure plunger 132 is provided with a first relief valve 18, one end of which is in fluid communication with the first oil outlet valve, and the other end is kept in communication with the oil chamber. This structure can achieve dynamic adjustment of hydraulic pressure through the opening and closing action of the relief valve. The relief valve core can be made of metal, and pressure control is achieved through the balance between spring force and hydraulic pressure. At the same time, the relief valve is connected to the oil chamber to improve efficiency. In specific implementation, the opening pressure value of the relief valve can be adjusted according to the actual working conditions, for example, by changing the spring preload or the valve port size. This design can match the oil flow characteristics during the reciprocating motion of the low-pressure plunger 132, ensuring the stable operation of the hydraulic system under high-pressure conditions. By setting the communication relationship between the relief valve and the oil chamber, the maximum pressure in the low-pressure plunger 132 can be effectively limited, avoiding damage to the seals or rupture of the low-pressure plunger 132 due to excessive pressure. During the movement of the low-pressure plunger 132, when the low-pressure outlet check valve opens, the relief valve automatically adjusts the oil flow path according to changes in the oil chamber pressure. This ensures effective oil delivery and prevents pressure fluctuations from affecting the axial pump 100, thus improving the operational stability of the hydraulic pump. It also reduces component wear caused by abnormal pressure, extending the service life of the axial pump 100. Furthermore, the relief valve optimizes the oil flow path, making the overall structure more compact and meeting the requirements for miniaturized installation.

[0034] Please continue reading. Figure 2The high-pressure plunger 131 includes a second inlet section 1311, a second connecting section 1312, and a second outlet section 1313. One end of the second inlet section 1311 is connected to the first pressure ball bearing 12; one end of the second connecting section 1312 is connected to the other end of the second inlet section 1311; the second outlet section 1313 is located on the side of the second connecting section 1312 away from the second inlet section 1311, and one end is connected to the other end of the second connecting section 1312; the connection direction of the second inlet section 1311, the second connecting section 1312, and the second outlet section 1313 is parallel to the center line of the main shaft 10. Specifically, the high-pressure plunger 131 is composed of the second inlet section 1311, the second connecting section 1312, and the second outlet section 1313. One end of the second oil inlet section 1311 is connected to the first pressure ball bearing 12, and the other end of the second oil inlet section 1311 is connected to one end of the second connecting section 1312. The other end of the second connecting section 1312 is connected to one end of the second oil outlet section 1313. The connection direction of the three sections is parallel to the center line of the main shaft 10. They can be integrally machined from metal materials or connected by welding. The connection between the second oil inlet section 1311 and the first pressure ball bearing 12 can be direct contact or a transition piece. A sealing structure can be provided at the connection between the second connecting section 1312 and the second oil inlet section 1311, and a threaded or snap-fit ​​structure can be used at the connection between the second oil outlet section 1313 and the second connecting section 1312. The parallel arrangement of the three sections can keep the plunger in a stable position during axial movement and reduce the risk of deflection. By aligning the connection directions of the second inlet section 1311, the second connecting section 1312, and the second outlet section 1313 parallel to the centerline of the axial pump 100, the high-pressure plunger 131 experiences more uniform force during axial movement, reducing the risk of localized wear and thus improving equipment reliability. The linear structure simplifies the machining process, reduces manufacturing difficulty, and simultaneously decreases oil flow resistance, thereby improving energy conversion efficiency.

[0035] Please continue reading. Figure 2 and Figure 3The axial pump 100 also includes a high-pressure outlet check valve 19, located on the side of the second outlet section 1313 near the second connecting section 1312, connecting the second outlet section 1313 and the second connecting section 1312. Specifically, the high-pressure outlet check valve 19 is positioned between the second outlet section 1313 and the second connecting section 1312, achieving unidirectional flow through a valve core and spring inside the valve body. A metal valve body combined with a rubber sealing ring can be used to ensure sealing performance under high pressure. In one embodiment, an integral valve body structure and a high-pressure plunger 131 can be integrated. The valve core opening pressure can be adjusted according to system requirements, for example, set to 1.2-1.5 times the working pressure. This arrangement ensures that fluid can only flow from the second connecting section 1312 to the second outlet section 1313, preventing backflow of oil and pressure fluctuations. Through the unidirectional flow function of the high-pressure outlet check valve 19, pressure loss and system instability caused by oil backflow are effectively avoided, improving the pump's volumetric efficiency. The integrated design of the high-pressure oil outlet check valve 19 and the high-pressure plunger 131 reduces the number of independent components, making the overall structure more compact, meeting the design requirements of small installation space, reducing assembly complexity, thereby reducing the failure rate and extending service life.

[0036] Please continue reading. Figure 2 and Figure 3 The high-pressure plunger 131 also includes a second relief valve 20, one end of which is connected to the second oil outlet valve, and the other end is connected to the oil chamber. Specifically, the high-pressure plunger 131 is equipped with a second relief valve 20, one end of which is connected to the second oil outlet valve, and the other end is connected to the oil chamber to form a pressure balance. The second relief valve 20 can be made of metal, such as stainless steel or aluminum alloy, and is fixed to the high-pressure plunger 131 by threads or snaps. During use, the second relief valve 20 can be set to a normally closed state, and automatically opens to release pressure when the oil pressure exceeds a preset value. At the same time, a filter screen can be installed in the connection channel between the oil chamber and the second relief valve 20 to intercept impurity particles. When the high-pressure plunger 131 moves, the pressure change in the oil chamber is dynamically regulated through the second relief valve 20 to avoid excessive pressure leading to seal failure. By setting the second relief valve 20, the oil chamber pressure can be monitored and controlled in real time, and automatic pressure release can be performed when abnormally high pressure occurs in the system, effectively preventing damage to seals and rupture of oil circuits. This pressure balancing mechanism reduces the system failure rate and reduces impact damage to precision components. The synergistic effect of the second overflow valve 20 and the second oil outlet valve makes the oil flow smoother, reducing noise and vibration. This integrated design reduces the overall installation space, ensuring both ease of processing and improved system reliability.

[0037] Please see Figure 1 and Figure 4The switching valve 15 includes a confluence end 151, a confluence section 152, and a switching valve body 153. The confluence end 151 is connected to multiple first oil outlet sections 1323, and the confluence section 152 is connected to the confluence end 151 and simultaneously connected to the second oil outlet section 1313 of the high-pressure plunger 131. The switching valve body 153 is located on the side of the confluence section 152 near the confluence end 151 and is used to control the flow of liquid from the first oil outlet section 1323 into the second oil outlet section 1313. Specifically, the confluence end 151 of the switching valve 15 is connected to multiple first oil outlet sections 1323, the confluence section 152 connects the confluence end 151 and the second oil outlet section 1313 of the high-pressure plunger 131, and the switching valve body 153 is located on the confluence section 152 near the confluence end 151 to guide the liquid from the first oil outlet section 1323 to the second oil outlet section 1313. When the switching valve body 153 is open, the confluence end 151 concentrates and transports the liquid from multiple first oil outlet sections 1323 to the confluence section 152, and then into the high-pressure oil circuit of the high-pressure plunger 131. When the switching valve body 153 is closed, the confluence end 151 cannot concentrate and transport the liquid from multiple first oil outlet sections 1323 to the confluence section 152. At this time, the liquid from the first oil outlet sections 1323 flows out into the oil chamber through the overflow port 154. The switching valve body 153 controls the liquid flow path mechanically or hydraulically. The valve body can be made of metal and the flow channel structure can be formed through precision machining. In one embodiment, the switching valve body 153 can adopt a ball valve structure to achieve sealing control. When the switching valve body 153 is open, by concentrating and transporting the liquid from multiple first oil outlet sections 1323 to the second oil outlet section 1313, the number of pipeline connection parts is reduced, the structural complexity is reduced, thereby saving installation space and improving processing efficiency. The design of the switching valve body 153 enables more precise control of liquid flow, reduces the possibility of leakage, and simplifies the maintenance process.

[0038] Please continue reading. Figure 1The axial pump 100 also includes a plunger seat 21 through which a high-pressure plunger 131 and a low-pressure plunger 132 pass, fixing their relative positions. The high-pressure plunger 131 and the low-pressure plunger 132 move in a direction perpendicular to the plunger seat 21. Specifically, the plunger seat 21 serves as a support structure for housing the high-pressure plunger 131 and the low-pressure plunger 132, maintaining their relative positional stability in the axial direction through its fixing effect. The high-pressure plunger 131 and the low-pressure plunger 132 reciprocate in a direction perpendicular to the plunger seat 21. The plunger seat 21 can be made of metal or engineering plastic, with a through-hole structure formed by machining. The high-pressure plunger 131 and the low-pressure plunger 132 can be coaxial cylindrical components with seals at their ends to ensure the hydraulic system's sealing. The plunger seat 21 is sized to accommodate compact installation requirements, and its surface treatment can employ a plating process to improve wear resistance. The precise positioning of the high-pressure plunger 131 and the low-pressure plunger 132 is achieved by setting the plunger seat 21, ensuring stable movement of both. This structural design effectively reduces the overall space occupied by the equipment, meeting the requirements of miniaturized installation. The constraint effect of the plunger seat 21 on the plunger reduces the risk of wear caused by relative displacement between components. When used with seals, it prevents the intrusion of small particles, improving the reliability of system operation. The vertical movement simplifies the hydraulic circuit layout, making the overall structure more compact and reasonable, while also facilitating manufacturing and subsequent maintenance.

[0039] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An axial pump, characterized in that, include: The spindle is used to connect to the power source; A swashplate, connected to and coaxially arranged with the main shaft; The first pressure ball bearing is located on the side of the swashplate away from the main shaft; Multiple plunger pumps are connected at one end to the lower end face of the first pressure ball bearing on the side away from the swashplate. The multiple plunger pumps include high-pressure plungers and low-pressure plungers. The center line of the area enclosed by the high-pressure plungers and the low-pressure plungers coincides with the center line of the main shaft. A cylinder block, designed around the plunger pump, the cylinder block having an oil chamber, the plunger pump being connected to the oil chamber; A switching valve connects the high-pressure plunger and the low-pressure plunger. When the pressure is greater than a threshold, the switching valve is closed, preventing oil in the low-pressure plunger from entering the high-pressure oil circuit of the high-pressure plunger. When the pressure is less than the threshold, the switching valve is open, allowing oil in the low-pressure plunger to enter the high-pressure oil circuit of the plunger pump.

2. The axial pump according to claim 1, characterized in that, Also includes: The oil suction check valve is partially connected to the low-pressure plunger and partially connected to the high-pressure plunger. The oil suction check valve is located between the low-pressure plunger and the cylinder body, or between the high-pressure plunger and the cylinder body, and communicates with the oil chamber.

3. The axial pump according to claim 1, characterized in that, The low-pressure plunger includes: The first oil inlet section, one end of which is connected to the first pressure ball bearing; The first connecting section is connected at one end to the other end of the first oil inlet section. The first oil outlet section is located on the side of the first connecting section away from the first oil inlet section; one end of it is connected to the other end of the first connecting section. The connection direction of the first oil inlet section, the first connecting section, and the first oil outlet section is parallel to the center line of the main shaft.

4. The axial pump according to claim 3, characterized in that, Also includes: A low-pressure oil outlet check valve is located on the side of the first oil outlet section near the first connecting section, connecting the first oil outlet section and the first connecting section.

5. The axial pump according to claim 3, characterized in that, The high-pressure plunger includes: The second oil inlet section has one end connected to the first pressure ball bearing; The second connecting section is connected at one end to the other end of the second oil inlet section. The second oil outlet section is located on the side of the second connecting section away from the second oil inlet section; one end of it is connected to the other end of the second connecting section. The connection direction of the second oil inlet section, the second connecting section and the second oil outlet section is parallel to the center line of the main shaft.

6. The axial pump according to claim 5, characterized in that, Also includes: A high-pressure oil outlet check valve is located on the side of the second oil outlet section near the second connecting section, connecting the second oil outlet section and the second connecting section.

7. The axial pump according to claim 5, characterized in that, The switching valve includes: The confluence end is connected to multiple first oil outlet sections. The confluence section is connected to the confluence end and also to the second oil outlet section of the high-pressure plunger; The switching valve body is located on the side of the confluence section near the confluence end, and is used to control the liquid in the first oil outlet section to enter the second oil outlet section.

8. The axial pump according to claim 1, characterized in that, Also includes: A plunger seat, through which the high-pressure plunger and the low-pressure plunger pass to fix the relative position between the high-pressure plunger and the low-pressure plunger, which move in a direction perpendicular to the plunger seat.

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