Lightweight compact swash plate axial plunger pump

Abstract

The invention discloses a light-weight compact swash plate axial plunger pump, relates to the technical field of pumps, and aims to solve the problems that a traditional plunger pump is large in size, heavy, high in cost, difficult to maintain and the like, the light-weight compact swash plate axial plunger pump takes a pump shell as a main body, all parts are assembled in order, a main shaft drives, a swash plate is matched with a plunger to achieve liquid pressurization, and a mechanical water seal and a valve plate guarantee sealing and liquid conveying. When the pump is made of a duplex stainless steel material, the weight is 1.5 Kg, and the size of a main body is phi 76 * 109; the weight of the composite material is 1.0 Kg when the composite material is combined with duplex stainless steel, and the composite material is the smallest specification in the field of seawater desalination booster pumps. The device has the advantages of light weight and compactness, and adapts to portable equipment; the structure is simple, cost is low and reliability is high; the performance is equivalent to or even better than that of imported brands, the environmental adaptability is high, and the competitiveness in multiple fields is outstanding.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and particularly to a lightweight and compact swashplate axial piston pump. Background Art

[0002] In the fields of modern industry and resource processing, the swashplate axial piston pump has become an indispensable core device in many industries due to its high-pressure and high-efficiency fluid transportation characteristics. In the current market, the imported Danfoss APP series dominates the swashplate axial piston pump, and many domestic manufacturers also imitate and produce products around this series. However, in the actual application process, such traditional swashplate axial piston pumps have gradually exposed a series of problems that restrict the development of the industry.

[0003] From a physical property perspective, the defects of large unit volume and heavy weight of traditional swashplate axial piston pumps are particularly prominent. In industrial production, the large volume greatly restricts the layout planning of equipment in the factory building, and more space needs to be reserved to meet the installation and operation requirements. This not only increases the site use cost but also reduces the space utilization rate. At the same time, the heavy weight requires professional lifting equipment and transportation tools during the transportation process, significantly increasing the transportation cost and difficulty. In addition, during the equipment installation process, the heavy pump body brings a huge physical burden to the installation personnel, with low installation efficiency and high safety risks.

[0004] In terms of economic cost, due to the difficulty in breaking through key technologies and core materials in domestic imitation products, the price of swashplate axial piston pumps remains high. For many small and medium-sized enterprises, the high procurement cost severely compresses the profit space of the enterprises, making them face financial pressure when updating equipment and upgrading technologies. At the same time, the high price also encounters resistance during the market promotion of products, restricting the improvement of the overall technical level of the industry and the popularization and application of equipment.

[0005] Analyzed from the perspectives of use and maintenance, traditional swashplate axial piston pumps have extremely strict requirements for the use environment and the professional skills of operators. Their complex internal structures and precision components make the operation process cumbersome, and operators need to undergo long-term professional training to master the operation methods of the equipment proficiently. Moreover, during the operation of the equipment, strict requirements are imposed on parameters such as the cleanliness, temperature, and pressure of the working medium. Once outside the specified range, it is extremely easy to cause equipment failures. For example, when impurities are contained in the working medium, it will exacerbate the wear of internal components, resulting in a decline in equipment performance or even damage; abnormal fluctuations in temperature and pressure will also affect the working efficiency and service life of the pump. In terms of equipment maintenance, due to the large number of components and complex structures, troubleshooting and repair work require a large amount of time and effort, not only increasing the maintenance cost but also prolonging the equipment downtime, affecting the production progress and the economic benefits of the enterprise.

[0006] In the field of portable seawater desalination treatment, the defects of traditional swashplate axial piston pumps are more obvious. With the increasing shortage of global fresh water resources, portable seawater desalination equipment has important application value in scenarios such as emergency rescue, field operations, and island life. However, after the existing swashplate axial piston pump is combined with a supporting motor, the overall equipment is bulky and overweight, far exceeding the reasonable load-bearing range for single-person carrying. Taking the general single-person carrying load requirement of not exceeding 30 kg as an example, traditional equipment is difficult to meet this standard, making it difficult to achieve single-person carrying and rapid deployment in actual applications, which greatly limits its popularization and use in these scenarios. In addition, in the fields of environmental protection waste filtrate pressurization treatment, hydraulic device pressurization treatment, etc., traditional swashplate axial piston pumps also have application limitations due to their large volume and weight. Therefore, developing a lightweight, compact swashplate axial piston pump with good economy and ease of use has become an urgent need to solve the current industry dilemma and promote the technological development of related fields. Summary of the Invention

[0007] The purpose of the present invention is to provide a lightweight and compact swashplate axial piston pump, which can effectively reduce the weight and volume of the pump, is applicable to small portable seawater desalination devices and other industries with requirements for the lightweight and compactness of the pump, while reducing the use and maintenance costs and improving the practicality and economy of the equipment.

[0008] To achieve the above purpose, the present invention adopts the following technical means:

[0009] A lightweight and compact swashplate axial piston pump, comprising: a pump housing, a main shaft end cover, an inlet and outlet end cover, a main shaft, a mechanical seal stationary ring, a mechanical seal rotating ring, a swashplate, a return spring plate, a spring, a distribution plate, a coupling, a plunger cylinder, a plunger, a ball retainer seat, a guide sleeve, and a slipper; the pump housing is the main support structure, accommodating various components inside; the main shaft end cover is installed at one end of the pump housing to seal and fix the main shaft; the inlet and outlet end cover is installed at the other end of the pump housing, provided with an inlet and an outlet; the main shaft penetrates the pump body along the central axis of the pump housing, connected to an external power source at one end, and coaxially connected to the plunger cylinder through a coupling at the other end; the swashplate is fixed inside the pump housing, inclined at an angle to the axis of the main shaft; the plunger is placed inside the plunger cylinder to perform reciprocating linear motion, and the slipper is installed at one end of the plunger to contact the swashplate; the guide sleeve is installed inside the pump housing to guide the movement of the plunger and the slipper; the return spring plate is connected to the spring through the ball retainer seat, and under the action of the spring, it presses against the swashplate, driving the plunger and the slipper to rotate circumferentially; the mechanical seal rotating ring is arranged inside the pump housing and sleeved outside the main shaft, and can rotate with the main shaft, and the mechanical seal stationary ring is arranged inside the main shaft end cover and sleeved outside the main shaft, closely fitting with the mechanical seal rotating ring; the distribution plate is installed inside the pump housing and closely cooperates with the end face of the plunger cylinder, and cooperates with the plunger cylinder to control liquid suction and pressure.

[0010] A further solution of the present invention is that the pump housing is a product made of duplex stainless steel or a combination of a new composite material and duplex stainless steel, and the size of the pump housing is φ76*109.

[0011] A further solution of the present invention is that the main shaft end cover is provided with multiple groups of mounting holes distributed circumferentially for fixedly installing the pump on other devices.

[0012] A further solution of the present invention is that the main shaft end cover and the inlet and outlet end covers are respectively fixedly connected to the pump housing by bolts distributed circumferentially.

[0013] A further solution of the present invention is that a first O-ring and a second O-ring are respectively provided at the connection positions of the main shaft end cover, the inlet and outlet end covers and the pump housing.

[0014] A further solution of the present invention is that filters are provided at both the inlet and outlet of the inlet and outlet end covers.

[0015] A further solution of the present invention is that the inclination angle range of the swash plate is 10°-20°.

[0016] A further solution of the present invention is that the spring is a compression spring product.

[0017] A further solution of the present invention is that the clearance between the plunger and the plunger cylinder is 0.005-0.012mm.

[0018] A further solution of the present invention is that the ball retainer is a high-strength plastic product.

[0019] Advantages of the present invention:

[0020] Lightweight and compact: When using duplex stainless steel material, the weight of the pump is only 1.5 Kg, and the main body size is φ76*109; when using a new composite material + duplex stainless steel material, the weight is even as low as 1.0 Kg. In the field of booster pumps for seawater desalination, both the weight and size are the smallest in the current market, and there are no similar products at home and abroad. This lightweight and compact characteristic enables the pump to better adapt to small portable devices, greatly improving the portability of the devices, facilitating single-person carrying and rapid deployment in scenarios such as emergency rescue and field operations, and significantly enhancing the use flexibility.

[0021] Structural Advantages: The pump has a simple structure, with fewer parts and a high degree of integration. Compared with imported brands of the same displacement and pressure, it has obvious advantages in terms of weight, volume, use and maintenance. The simplified structure not only reduces the manufacturing process difficulty and production cost, but also reduces the probability of failure due to the reduction of the number of parts, improving the reliability of the pump. At the same time, the high degree of integration and convenient installation and use methods facilitate users to install, debug and maintain, effectively reducing the use and maintenance costs and improving the work efficiency.

[0022] Performance Improvement: Although the volume and weight of the pump have been greatly reduced, through the optimization of the internal structure and working principle, under the same displacement and pressure conditions, its performance is equivalent to or even better than that of imported brands. The optimized swash plate angle design and precise port plate structure make the suction and discharge of liquid smoother and more efficient, reducing energy loss and improving the working efficiency of the pump. Moreover, the simplified structure and selected materials reduce the friction and wear between components, extend the service life of the pump, and reduce the number of maintenance times and maintenance costs. In addition, the pump also has good environmental adaptability, can operate stably under a variety of complex working conditions, broadens the application fields of the product, and shows strong competitiveness in fields such as seawater desalination, environmental protection garbage filtrate treatment, and hydraulic device pressurization treatment. Description of the Drawings

[0023] Figure 1 is the structural schematic diagram of the present invention Figure 1 ;

[0024] Figure 2 is the structural schematic diagram of the present invention Figure 2 ;

[0025] Figure 3 is the side view of the present invention Figure 1 ;

[0026] Figure 4 is the side view of the present invention Figure 2 ;

[0027] Figure 5 is the cross-sectional view of the present invention;

[0028] Reference Numerals:

[0029] Pump housing 1, spindle end cover 2, inlet and outlet end cover 3, water inlet 4, water outlet 5, spindle 6, mounting hole 7, mechanical seal stationary ring 8, mechanical seal rotating ring 9, first O-ring 10, swash plate 11, return spring disk 12, spring 13, port plate 14, coupling 15, second O-ring 16, plunger cylinder 17, plunger 18, ball retainer 19, guide sleeve 20, slipper 21. Detailed Embodiments

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] As Figures 1 to 5 shown, a lightweight and compact swashplate axial piston pump includes: a pump housing 1, a main shaft end cover 2, an inlet and outlet end cover 3, a main shaft 6, a mechanical seal stationary ring 8, a mechanical seal rotating ring 9, a swashplate 11, a return spring plate 12, a spring 13, a distribution plate 14, a coupling 15, a piston cylinder 17, a piston 18, a ball retaining seat 19, a guide sleeve 20, and a slipper 21; the pump housing 1 is the main support structure and houses various components; the main shaft end cover 2 is installed at one end of the pump housing 1 to seal and fix the main shaft 6; the inlet and outlet end cover 3 is installed at the other end of the pump housing 1 and is provided with an inlet 4 and an outlet 5; the main shaft 6 penetrates the pump body along the central axis of the pump housing 1, is connected to an external power source at one end, and is coaxially connected to the piston cylinder 17 through the coupling 15 at the other end; the swashplate 11 is fixed inside the pump housing 1 and forms an inclined angle with the axis of the main shaft 6; the piston 18 is placed inside the piston cylinder 17 to perform reciprocating linear motion, and the slipper 21 is installed at one end of the piston 18 and contacts the swashplate 11; the guide sleeve 20 is installed inside the pump housing 1 to guide the movement of the piston 18 and the slipper 21; the return spring plate 12 is connected to the spring 13 through the ball retaining seat 19 and presses against the swashplate 11 under the action of the spring 13, driving the piston 18 and the slipper 21 to rotate circumferentially; the mechanical seal rotating ring 9 is arranged inside the pump housing 1 and sleeved outside the main shaft 6 and can rotate with the main shaft 6, and the mechanical seal stationary ring 8 is arranged inside the main shaft end cover 2 and sleeved outside the main shaft 6 and is in close fit with the mechanical seal rotating ring 9; the distribution plate 14 is installed inside the pump housing 1 and is in close fit with the end face of the piston cylinder 17, and cooperates with the piston cylinder 17 to control liquid suction and pressure.

[0033] Working principle

[0034] When the external power source drives the main shaft 6 to rotate, the main shaft 6 penetrates the pump body, and its rotational motion is transmitted to the piston cylinder 17 through the coupling 15, thereby driving the piston 18 and the slipper 21 to rotate around the axis of the main shaft 6 under the guiding action of the guide sleeve 20.

[0035] The swashplate 11 is fixedly installed inside the pump housing 1 and forms a certain inclined angle with the axis of the main shaft 6, which is the key to realizing the reciprocating motion of the piston. Under the action of the spring 13, one end of the spring 13 is fixed inside the pump housing 1, and the other end pushes the return spring plate 12 to closely adhere to the swashplate 11 through the ball retaining seat 19. Due to the inclination of the swashplate 11, when the piston 18 and the slipper 21 perform rotational motion, under the constraint of the swashplate 11 surface, the piston 18 will perform reciprocating linear motion along its axis inside the piston cylinder 17.

[0036] When the plunger 18 moves outward, the volume inside the plunger cylinder 17 increases, forming a negative pressure. At this time, under the action of the pressure difference, the liquid enters the pump through the water inlet 4 on the water inlet and outlet end cover 3, and flows into the plunger cylinder 17 through specific channels on the distribution plate 14, completing the liquid suction process.

[0037] When the plunger 18 moves inward, the volume inside the plunger cylinder 17 decreases, and the liquid is squeezed, resulting in an increase in pressure. Under the action of the pressure, the liquid is guided by the distribution plate 14 and flows out of the pump body through the water outlet 5 on the water inlet and outlet end cover 3, realizing the liquid discharge process.

[0038] During the entire working process, the mechanical seal structure composed of the mechanical seal dynamic ring 9 and the mechanical seal static ring 8 effectively improves the sealing performance of the pump, prevents liquid leakage and the entry of external impurities, and ensures the stable and efficient operation of the pump.

[0039] Embodiment 2

[0040] As Figures 1 to 5 shown, a lightweight and compact swashplate axial piston pump includes: a pump housing 1, a main shaft end cover 2, a water inlet and outlet end cover 3, a main shaft 6, a mechanical seal static ring 8, a mechanical seal dynamic ring 9, a swashplate 11, a return spring plate 12, a spring 13, a distribution plate 14, a coupling 15, a plunger cylinder 17, a plunger 18, a ball retainer seat 19, a guide sleeve 20, and a slipper 21; the pump housing 1 is the main support structure and houses various components; the main shaft end cover 2 is installed at one end of the pump housing 1 to seal and fix the main shaft 6; the water inlet and outlet end cover 3 is installed at the other end of the pump housing 1 and is provided with a water inlet 4 and a water outlet 5; the main shaft 6 passes through the pump body along the central axis of the pump housing 1, is connected to an external power source at one end, and is coaxially connected to the plunger cylinder 17 through the coupling 15 at the other end; the swashplate 11 is fixed inside the pump housing 1 and is inclined at an angle to the axis of the main shaft 6; the plunger 18 is placed inside the plunger cylinder 17 to perform reciprocating linear motion, and the slipper 21 is installed at one end of the plunger 18 and contacts the swashplate 11; the guide sleeve 20 is installed inside the pump housing 1 to guide the movement of the plunger 18 and the slipper 21; the return spring plate 12 is connected to the spring 13 through the ball retainer seat 19 and presses against the swashplate 11 under the action of the spring 13, driving the plunger 18 and the slipper 21 to rotate circumferentially; the mechanical seal dynamic ring 9 is arranged inside the pump housing 1 and sleeved outside the main shaft 6, and can rotate with the main shaft 6, and the mechanical seal static ring 8 is arranged inside the main shaft end cover 2 and sleeved outside the main shaft 6, and is in close fit with the mechanical seal dynamic ring 9; the distribution plate 14 is installed inside the pump housing 1 and is in close fit with the end face of the plunger cylinder 17, and cooperates with the plunger cylinder 17 to control the liquid suction and pressure.

[0041] The pump housing 1 is a product made of duplex stainless steel or a combination of a new composite material and duplex stainless steel, and the size of the pump housing 1 is φ76*109.

[0042] The advantages of the above settings are:

[0043] Lightweight Advantage: Duplex stainless steel itself has a relatively high strength-to-weight ratio. Compared with traditional single stainless steel materials, it can reduce weight while ensuring structural strength. The combination of the new composite material and duplex stainless steel further exploits the low density characteristic of the composite material, significantly reducing the weight of the pump casing. Coupled with the overall small size design of φ76*109, the weight of the entire piston pump is greatly reduced. When using duplex stainless steel material, the pump weighs only 1.5 Kg, and when using the combined material, it can be as low as 1.0 Kg, effectively solving the problems of large volume and heavy weight of traditional piston pumps and meeting the lightweight requirements of small portable devices. For example, in a portable seawater desalination device, it is convenient for a single person to carry and operate.

[0044] High Strength and Durability: Duplex stainless steel has excellent strength and corrosion resistance, and the new composite material also has good mechanical properties. The pump casing combined by the two can withstand the pressure brought by the internal high-pressure liquid and is not easily deformed or damaged. At the same time, when facing complex corrosive media such as seawater desalination and environmental protection waste filtrate treatment, the pump casing of this material combination can effectively resist corrosion, extend the service life of the pump, reduce the equipment maintenance and replacement frequency, and lower the use cost.

[0045] Structural Compactness: The precise size design of φ76*109 enables the pump casing to minimize its volume as much as possible while meeting the installation and operation space requirements of internal components, achieving compactness. This compact structural design, on the one hand, saves installation space and is suitable for working environments with limited space, such as inside ships and small operation platforms; on the other hand, the layout with other internal components of the pump is more reasonable, which is conducive to improving the overall integration of the pump, making the connection and cooperation between components more tight, and enhancing the stability of the pump operation.

[0046] Adaptability and Versatility: The smaller size and lightweight design enable this piston pump to better cooperate with lightweight and small-volume motors and be adapted to a variety of small devices and systems, broadening the application fields of the product. Whether in different industry scenarios such as seawater desalination pressurization treatment, environmental protection waste filtrate pressurization treatment, or hydraulic device pressurization treatment, it can be flexibly applied with its compact and lightweight characteristics, improving the overall performance and applicability of the equipment.

[0047] The main shaft end cover 2 is provided with multiple groups of mounting holes 7 distributed circumferentially for fixedly installing the pump on other devices.

[0048] The advantages of the above settings are as follows:

[0049] Convenient and efficient installation: Multiple groups of mounting holes 7 distributed in a circle provide a variety of fixed point options for the installation of the pump. Installers can flexibly match connectors such as bolts according to the actual installation environment and requirements, and quickly fix the pump to other equipment. Compared with single or irregularly distributed mounting holes, this design does not require complex alignment operations, can significantly shorten the installation time, improve the installation efficiency, and is especially suitable for large-scale equipment assembly or emergency installation scenarios.

[0050] Stable and reliable structure: The mounting holes 7 distributed in a circle can evenly disperse the forces when the pump is fixed. When the pump is running, the movement of internal components and the liquid pressure will generate various forces. Through the circumferentially symmetric fixing method, it can effectively avoid problems such as installation loosening and deformation caused by excessive local stress, ensure the stability of the connection between the pump and other equipment, thereby enhancing the reliability of the pump during operation, and reducing the risk of failures caused by insecure installation.

[0051] Enhanced adaptability: The setting of multiple groups of mounting holes 7 enables this pump to adapt to mounting bases or equipment of different specifications and structures. Whether it is flat installation, side installation, or cooperation with brackets of different shapes, connections can be made by selecting appropriate mounting holes, enhancing the versatility of the pump in various application scenarios, broadening the scope of use of the product, and reducing the application limitations caused by mismatched installation interfaces.

[0052] Convenient for disassembly and maintenance: When the pump needs to be overhauled, maintained, or replaced, the mounting holes 7 distributed in a circle are convenient for disassembly operations. During the disassembly process, the bolts can be loosened in a certain order to smoothly disassemble the pump, avoiding damage to components or equipment caused by improper disassembly order. At the same time, this design also facilitates reinstallation after maintenance, ensuring that the pump can quickly resume normal operation, reducing equipment downtime, and improving production efficiency.

[0053] The main shaft end cover 2 and the inlet and outlet end covers 3 are respectively fixedly connected to the pump housing 1 by bolts distributed in a circle.

[0054] The advantages of the above settings are as follows:

[0055] Excellent sealing performance: The bolts distributed in a circle can apply uniform pressure to the end covers, ensuring a tight fit between the end covers and the pump housing 1. During the operation of the pump, the internal liquid is in a high-pressure state, and the uniform pressure distribution can effectively prevent liquid leakage from the connection between the end covers and the pump housing 1. The first O-ring 13 and the second O-ring 14 are respectively arranged at the connections between the main shaft end cover 2, the inlet and outlet end covers 3 and the pump housing 1, and cooperate with the pressure generated by the bolt tightening to further enhance the sealing effect, ensure the efficient operation of the pump, and at the same time avoid liquid leakage from polluting the working environment or causing safety hazards.

[0056] Reliable structural strength: This connection method forms a firm integral structure between the end cover and the pump housing 1. During the operation of the pump, the movement of internal components and the pressure of the liquid will generate complex acting forces. The bolts distributed along the circumference can evenly disperse these acting forces, avoiding deformation or damage to the connection part caused by excessive local stress. This not only improves the stability and reliability of the overall pump structure but also effectively extends the service life of the pump, reducing failures and maintenance costs caused by structural problems.

[0057] Convenient installation and disassembly: Bolt connection is a common and mature connection method. The installation process is simple and easy to understand, and operators can complete the installation without special tools and complex techniques. During the equipment assembly and maintenance process, the bolts distributed along the circumference can be installed and disassembled in a certain order, which is convenient and fast. This method helps to improve the installation efficiency, shorten the equipment maintenance time, and reduce labor costs and economic losses caused by equipment downtime.

[0058] Good adaptability and adjustability: By adjusting the tightening degree of the bolts, the sealing pressure and connection tightness between the end cover and the pump housing 1 can be flexibly controlled. In practical applications, the requirements for the sealing and structural strength of the pump may vary under different working conditions. This connection method can be easily adjusted to adapt to various working environments and usage requirements. At the same time, for end covers and pump housings 1 of different specifications or materials, as long as the distribution and size of the bolt holes match, the connection can be achieved, enhancing the versatility and interchangeability of the product.

[0059] At the connection parts of the main shaft end cover 2 and the water inlet and outlet end cover 3 with the pump housing 1, a first O-ring 10 and a second O-ring 16 are respectively provided.

[0060] The advantages of the above settings are as follows:

[0061] Efficient sealing: The O-ring has good elasticity and compression deformation ability. When the end cover is connected to the pump housing, it is squeezed into the gap between the two, which can effectively fill the gap, prevent liquid from leaking from the connection, ensure that the liquid in the pump can maintain good sealing under high pressure, maintain the normal working pressure of the pump, and improve the working efficiency of the pump.

[0062] Error compensation: During the processing and assembly of parts, there will inevitably be certain dimensional errors and surface unevenness. The O-ring can compensate for these errors and unevenness through its own elastic deformation, enabling good sealing even if there are minor inaccuracies in the fit between the end cover and the pump housing, reducing the requirements for part processing accuracy and assembly process, and thus reducing production costs.

[0063] Buffer and shock absorption: During the operation of the pump, vibrations and impacts are generated. The O-ring can play a certain role in buffering and shock absorption. It can absorb part of the vibration energy, reduce the friction and wear caused by vibration between the end cover and the pump housing, avoid loosening and fatigue damage at the connection part, extend the service life of the pump, and also help reduce the operating noise.

[0064] Corrosion and wear resistance: Usually, O-rings are made of rubber materials that are resistant to oil, water, and corrosion. They can adapt to various liquid media transported inside the pump and are not easily worn during long-term use. They have good durability and reliability, reducing the maintenance and replacement frequency caused by seal failure and improving the operating stability of the pump.

[0065] Filter meshes are provided at both the water inlet 4 and the water outlet 5 of the inlet and outlet end cover 3.

[0066] The advantages of the above settings are as follows:

[0067] Protect the internal parts of the pump body: The filter mesh can effectively intercept foreign objects such as solid particles, impurities, and fibers in the liquid. During the operation of the pump, if these foreign objects enter the pump body, they will exacerbate the wear between moving parts such as the plunger 9 and the plunger cylinder 18, and the slipper 10 and the swash plate 8, resulting in scratches and deformation on the surface of the parts, affecting the sealing performance and working efficiency of the pump, and even causing damage to the parts. By setting the filter mesh, foreign objects can be blocked outside and prevented from entering the pump body, thereby extending the service life of each component inside the pump and improving the overall reliability and stability of the pump.

[0068] Guarantee the quality of liquid transportation: In application scenarios such as seawater desalination and environmental protection waste filtrate treatment, high requirements are placed on the quality of the transported liquid. If impurities are mixed in the liquid, it will not only affect the effect of subsequent treatment processes but also may cause damage to related equipment. The filter meshes at the inlet and outlet can filter out impurities in the liquid, ensure the purity of the output liquid, enable subsequent equipment to operate normally, and ensure the treatment effect and product quality of the entire system.

[0069] Reduce maintenance costs and frequency: Since the filter mesh intercepts a large amount of impurities, the wear degree of the internal parts of the pump body is reduced, and the probability of failure is decreased. This means that the maintenance cycle of the equipment is extended and the maintenance workload is reduced. At the same time, the situation of frequently replacing components due to excessive wear of parts is avoided, reducing the maintenance cost. In addition, regularly cleaning or replacing the filter mesh is relatively simple and convenient, with lower costs and more convenient operation compared to repairing the complex parts inside the pump body.

[0070] Improving the operating stability of the lift pump: The entry of foreign objects into the pump body may cause problems such as abnormal vibration and increased noise during the operation of the pump, affecting the normal operation and working performance of the pump. The setting of the filter screen can prevent foreign objects from interfering with the normal movement of the parts inside the pump, enabling the pump to operate smoothly, reducing the downtime of failures caused by foreign objects, ensuring the continuity of the production or treatment process, and improving work efficiency.

[0071] Embodiment 3

[0072] As Figures 1 to 5 shown, a lightweight and compact swashplate axial piston pump includes: a pump housing 1, a main shaft end cover 2, an inlet and outlet end cover 3, a main shaft 6, a mechanical seal stationary ring 8, a mechanical seal rotating ring 9, a swashplate 11, a return spring plate 12, a spring 13, a distribution plate 14, a coupling 15, a piston cylinder 17, a piston 18, a ball retaining seat 19, a guide sleeve 20, and a slipper 21; the pump housing 1 is the main supporting structure that houses various components inside; the main shaft end cover 2 is installed at one end of the pump housing 1 to seal and fix the main shaft 6; the inlet and outlet end cover 3 is installed at the other end of the pump housing 1, and is provided with an inlet 4 and an outlet 5; the main shaft 6 penetrates the pump body along the central axis of the pump housing 1, is connected to an external power source at one end, and is coaxially connected to the piston cylinder 17 through the coupling 15 at the other end; the swashplate 11 is fixed inside the pump housing 1 and is inclined at an angle to the axis of the main shaft 6; the piston 18 is placed inside the piston cylinder 17 to perform reciprocating linear motion, and the slipper 21 is installed at one end of the piston 18 and contacts the swashplate 11; the guide sleeve 20 is installed inside the pump housing 1 to guide the movement of the piston 18 and the slipper 21; the return spring plate 12 is connected to the spring 13 through the ball retaining seat 19, and presses against the swashplate 11 under the action of the spring 13 to drive the piston 18 and the slipper 21 to rotate circumferentially; the mechanical seal rotating ring 9 is arranged inside the pump housing 1 and sleeved outside the main shaft 6, and can rotate together with the main shaft 6, and the mechanical seal stationary ring 8 is arranged inside the main shaft end cover 2 and sleeved outside the main shaft 6, and is in close fit with the mechanical seal rotating ring 9; the distribution plate 14 is installed inside the pump housing 1 and is in close fit with the end face of the piston cylinder 17, and cooperates with the piston cylinder 17 to control the suction and pressure of the liquid.

[0073] The inclination angle range of the swashplate 11 is 10° - 20°.

[0074] The advantages of the above settings are as follows:

[0075] Optimizing displacement adjustment: Within this angle range, the change in the inclination angle of the swashplate can more precisely control the displacement of the piston pump. When the angle is small, the piston stroke is short and the pump displacement is small, which can meet the low-flow requirements; when the angle increases, the piston stroke becomes longer and the displacement increases accordingly. This characteristic enables the pump to flexibly adjust the output flow according to the actual working needs and adapt to different working conditions. For example, in some chemical production processes that require precise control of liquid flow, the liquid infusion volume can be precisely controlled by adjusting the swashplate angle.

[0076] Improving the pump efficiency: The inclination angle range of 10° - 20° helps the pump maintain a high efficiency under different operating conditions. When the swash plate angle varies within this range, the movement trajectory and force conditions of the plunger are relatively reasonable, which can effectively reduce energy loss and improve the conversion efficiency between mechanical energy and hydraulic energy.

[0077] Enhancing system stability: This angle range can make the output pressure of the pump more stable. The reasonable setting of the swash plate angle makes the movement of the plunger in the cylinder block relatively smooth, avoiding pressure fluctuations caused by too large or too small angles. Stable pressure output is crucial for ensuring the stability and reliability of the hydraulic system, which can reduce the occurrence of pressure shocks and vibrations in the system and extend the service life of each component in the system.

[0078] Spring 13 is a compression spring product.

[0079] The advantages of the above settings are as follows:

[0080] Ensuring stable sealing and fitting: The compression spring can continuously provide a stable elastic force to push the return disk 12 tightly against the swash plate 8 and make the plunger cylinder 18 press tightly against the valve plate 17. During the operation of the pump, in the face of pressure changes under different operating conditions, the designed elastic coefficient can ensure that the pressure provided by the spring always meets the sealing requirements and prevent liquid leakage. At the same time, it ensures good fitting between components such as the plunger 18 and the slipper 10 and the swash plate 8, maintaining the sealing and stability of the normal operation of the pump and improving the working efficiency of the pump.

[0081] Adapting to different working pressures: Design the elastic coefficient according to the working pressure of the pump so that the spring can adapt to different pressure environments. When the pump is in a high-pressure working state, the elastic force of the spring can effectively resist the pressure, ensuring the relative position stability of the internal components and preventing component displacement or deformation caused by excessive pressure; in the low-pressure working state, the spring will not increase unnecessary resistance due to excessive elastic force, ensuring that the plunger 18 can move flexibly to realize the normal suction and discharge of liquid, so that the pump can operate reliably under various pressure conditions.

[0082] Optimizing the plunger movement performance: The elastic coefficient that fits the movement requirements of the plunger 18 can assist the plunger 18 to move more smoothly in the plunger cylinder 18 in a reciprocating linear motion. During the return stroke of the plunger, the elastic force of the spring can help the plunger quickly reset and cooperate with the structure of the swash plate 8 to achieve an efficient liquid suction process; during the discharge stage, the spring can buffer the pressure received by the plunger to a certain extent, reduce shocks and vibrations, reduce the wear of moving parts, and extend the service life of the pump. At the same time, the stable elastic force helps to ensure the regularity and accuracy of the plunger movement, making the flow output of the pump more stable.

[0083] The clearance between the plunger 18 and the plunger cylinder 17 is 0.005 - 0.012 mm.

[0084] The advantages of the above settings are as follows:

[0085] Good sealing performance: This clearance range can effectively ensure the sealing performance of the pump during operation. When the plunger 18 makes a reciprocating linear motion in the plunger cylinder 17, the small clearance makes it difficult for the liquid to leak from the gap between the two. Under the high-pressure environment formed inside the pump, the appropriate clearance can prevent the liquid from flowing back, ensuring that the liquid is sucked in from the water inlet and pressed out from the water outlet along the predetermined path, thereby ensuring the stability of the output pressure and flow rate of the pump, improving the working efficiency and performance of the pump.

[0086] Reduce wear and energy consumption: The mating clearance of 0.005 - 0.012 mm avoids excessive friction between the plunger 18 and the plunger cylinder 17 due to too small a clearance. Excessive friction will not only accelerate the wear of components and shorten the service life of the pump, but also increase the energy consumption during operation. The reasonable clearance enables an appropriate lubricating film to be maintained between the two, which can not only reduce the frictional resistance, reduce the degree of wear, extend the service life of the components, but also reduce the energy loss, improve the energy utilization efficiency of the pump, and save the operation cost.

[0087] Ensure movement flexibility: This clearance range ensures that the plunger 18 can move reciprocally flexibly in the plunger cylinder 17. If the clearance is too large, the plunger may shake during movement, resulting in unstable movement, affecting the liquid suction and discharge effects, and causing flow rate fluctuations and pressure instability; while the appropriate clearance can make the movement trajectory of the plunger more accurate, ensuring that it works smoothly and efficiently according to the design requirements, thereby improving the overall operation stability and reliability of the pump.

[0088] Adapt to changes in the working environment: During the actual operation of the pump, temperature changes in the working environment may cause thermal expansion and contraction of components. The mating clearance of 0.005 - 0.012 mm reserves a certain space, which can, to a certain extent, adapt to this dimensional change, prevent the plunger 18 and the plunger cylinder 17 from getting stuck or the clearance becoming too large due to temperature changes, enhance the adaptability of the pump to different working environments, and ensure that the pump can operate normally under various working conditions.

[0089] A further solution of the present invention is that the ball retainer 19 is made of high-strength plastic.

[0090] The advantages of the above settings are as follows:

[0091] Achieve lightweight design: The density of the high-strength plastic material is much lower than that of metal materials. Using this material to manufacture the ball retainer 19 can significantly reduce the overall weight of the pump. For the lightweight and compact swashplate axial piston pump of the present invention, the lightweight of the ball retainer 19 helps to further reduce the self-weight of the equipment, meet the stringent requirements for equipment portability in application scenarios such as small portable seawater desalination devices, and make the equipment more convenient for transportation, installation, and single-person operation.

[0092] Reduce production costs: Compared with metal materials, the raw material costs and processing costs of high-strength plastics are usually lower. During the manufacturing process, plastic products can be quickly processed through molding processes such as injection molding, reducing complex machining procedures, improving production efficiency, and reducing production energy consumption. This not only helps reduce the production cost of the ball holder 19, but also further reduces the manufacturing cost of the entire pump, enhancing the price competitiveness of the product in the market.

[0093] Good friction performance: Many high-strength plastics themselves have self-lubricating properties, which can effectively reduce the friction coefficient between components such as the return disk 12. During the operation of the pump, the ball holder 19 comes into frequent contact and relative motion with other components. The low friction coefficient can reduce wear between components, reduce energy loss, and improve the operating efficiency of the pump. At the same time, reducing friction also helps reduce operating noise and enhance the smoothness and comfort of equipment operation.

[0094] Excellent corrosion resistance: High-strength plastics have good corrosion resistance to a variety of chemical substances. In application scenarios such as seawater desalination and environmental protection garbage filtrate treatment, they can effectively resist the erosion of liquid media, avoiding component damage and performance degradation caused by corrosion. Compared with metal materials, the ball holder 19 made of high-strength plastics does not require additional anti-corrosion treatment, has a longer service life, reduces the maintenance and replacement frequency, and reduces the use and maintenance costs of the equipment.

[0095] High design flexibility: High-strength plastics can be modified according to different performance requirements. By adding different additives, their strength, toughness, wear resistance and other properties can be adjusted. In addition, plastic materials are easy to form, can meet complex structural design requirements, and facilitate the design of the ball holder 19 into a shape that precisely fits other components inside the pump, optimizing the internal structure layout of the pump and improving the overall performance and integration.

[0096] Example 4

[0097] Application in small portable seawater desalination device

[0098] Technical parameters

[0099] Flow rate: Based on the fresh water output requirements of the small portable seawater desalination device, the rated flow rate of the pump is set to 8 L / min, which can provide an appropriate amount of seawater for desalination treatment per unit time.

[0100] Pressure: Considering the pressure requirements of the reverse osmosis membrane for seawater desalination, the rated working pressure of the pump is determined to be 7.5 MPa, which can ensure the smooth passage of seawater through the reverse osmosis membrane and achieve efficient desalination.

[0101] Rotation speed: It is equipped with a dedicated low-power motor with a motor rotation speed of 1800 r / min. After passing through an adapted transmission mechanism, the actual working rotation speed of the pump is 1200 r / min, ensuring a stable flow output.

[0102] Structural features

[0103] Swash plate angle: The inclination angle of the swash plate 11 is fixed at 20°. At this angle, the reciprocating movement stroke of the plunger 18 reaches a good match with the flow rate and pressure characteristics of the pump, which can effectively improve the working efficiency of the pump and reduce energy consumption at the same time.

[0104] Spring design: The spring 13 uses a customized compression spring. According to the working conditions of the pump under a pressure of 7.5 MPa, the elastic coefficient is accurately designed to ensure that the spring can stably push the return disk 12 under high-pressure conditions, making the plunger 18 closely fit with the distribution plate 17, ensuring the sealing and stability of the pump.

[0105] Material selection: The pump housing is made of a combination of a new composite material and duplex stainless steel, which significantly reduces the weight while ensuring strength; the plunger 18 is made of a combination of a composite material and duplex stainless steel, with both high strength and excellent seawater corrosion resistance; the ball retainer 19 is made of a high-strength, self-lubricating plastic product, reducing frictional losses.

[0106] Application effect

[0107] Lightweight and portable: The total weight of the pump is controlled within 4.5 kg, with a small volume, making it convenient for a single person to carry and quickly install, meeting the requirements for portable seawater desalination equipment in scenarios such as the wild and islands.

[0108] High efficiency and stability: Under rated working conditions, the pump operates stably, continuously providing stable pressure and flow rate for the seawater desalination device. The freshwater output and water quality both meet the expected standards, effectively solving the drinking water problem in water-scarce areas.

[0109] Implementation 5

[0110] Application in environmental protection waste filtrate treatment equipment

[0111] Technical parameters

[0112] Flow rate: Considering the treatment scale of the environmental protection waste filtrate treatment equipment, the rated flow rate of the pump is set at 15 L / min, which can meet the equipment's demand for timely conveying of waste filtrate and ensure the smoothness of the treatment process.

[0113] Pressure: Considering the resistance in the filtration, separation and other links during the waste filtrate treatment process, the rated working pressure of the pump is set at 7.5 MPa to ensure that the filtrate can smoothly pass through each treatment unit.

[0114] Rotational speed: Driven by a variable-frequency motor, the rotational speed of the pump can be flexibly adjusted within the range of 800 - 1800 r / min, enabling precise control of the flow rate according to the different treatment stages and treatment volume requirements of the garbage filtrate.

[0115] Structural features

[0116] Swashplate angle: The inclination angle of the swashplate 11 can be manually adjusted between 10° - 20°. By adjusting the swashplate angle, the stroke of the plunger 18 is changed, thereby achieving a wide range of flow rate adjustment to adapt to the working conditions with large flow rate fluctuations during the garbage filtrate treatment process.

[0117] Spring design: The spring 13 is selected as a variable-stiffness compression spring. Through the intelligent control system, according to the real-time working pressure and rotational speed of the pump, the spring stiffness is automatically adjusted to ensure that the plunger 18 can obtain an appropriate elastic force under different working conditions and maintain the stable operation of the pump.

[0118] Material selection: The pump casing is made of stainless steel to enhance corrosion resistance; the surface of the plunger 18 is subjected to special coating treatment to improve wear resistance and corrosion resistance; the ball retainer seat 19 is made of high-strength, acid- and alkali-resistant engineering plastics, which can effectively resist the erosion of harmful substances in the garbage filtrate.

[0119] Application effect

[0120] Strong adaptability: Through the adjustment of the swashplate angle and the automatic adjustment of the spring stiffness, the pump can quickly adapt to the changes in flow rate and pressure during the garbage filtrate treatment process, ensure the stable operation of the treatment equipment, and improve the treatment efficiency.

[0121] Long service life and low maintenance: The selected corrosion-resistant and wear-resistant materials effectively extend the service life of the pump, reduce the maintenance and replacement frequency, lower the equipment operation cost, and improve the reliability and economy of the environmental protection garbage filtrate treatment equipment.

[0122] Example 6

[0123] Application of small hydraulic device

[0124] Technical parameters

[0125] Flow rate: For the working requirements of the small hydraulic device, the rated flow rate of the pump is set at 6 L / min, which can provide a stable hydraulic oil flow rate for the hydraulic system and drive the actuator to operate.

[0126] Pressure: According to the working load of the hydraulic device and the working pressure requirements of the actuator, the rated working pressure of the pump is set at 15 MPa, which can meet the pressure requirements of the hydraulic system under different working conditions.

[0127] Rotation speed: Equipped with a high-performance motor, the motor rotates at 2000 r / min. Through the gear transmission device, the working speed of the pump reaches 1500 r / min, ensuring a stable output of hydraulic oil.

[0128] Structural features

[0129] Swash plate angle: The inclination angle of the swash plate 11 is fixed at 20°. At this angle, the flow rate and pressure characteristics of the pump can be well adapted to the working requirements of small hydraulic devices, providing a stable power output for the hydraulic system.

[0130] Spring design: The spring 13 is a high-elastic compression spring. According to the working state of the pump under a pressure of 7.5 MPa, the spring parameters are precisely designed to ensure that the spring can stably push the return disk 12 under high-pressure conditions, maintaining the normal movement of the plunger 18 and the sealing performance of the pump.

[0131] Material selection: The pump housing is made of aluminum alloy to achieve lightweight; the plunger 18 is made of alloy steel and is surface hardened to improve hardness and wear resistance; the ball retainer seat 19 is made of a plastic product with high strength and low friction coefficient, reducing the friction between components and improving the mechanical efficiency of the pump.

[0132] Application effect

[0133] Compact and efficient: The pump is small in size and light in weight, making it easy to integrate into small hydraulic devices without taking up too much space; under rated working conditions, the pump operates efficiently and stably, providing a stable pressure and flow rate for the hydraulic system, ensuring that the actuators of the hydraulic device operate accurately and reliably.

[0134] Energy-saving and reliable: By optimizing the structure and material selection, the energy consumption of the pump is reduced and the energy utilization efficiency is improved; at the same time, the design of high-wear-resistant and high-reliability components extends the service life of the pump, reduces the probability of failures, and improves the overall performance and reliability of small hydraulic devices.

[0135] The above are only examples of the present invention and do not limit the implementation modes. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all implementation modes here, and the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A lightweight and compact swashplate axial piston pump, characterized in that, Including: Pump housing (1), main shaft end cover (2), inlet and outlet end covers (3), main shaft (6), mechanical seal static ring (8), mechanical seal dynamic ring (9), swash plate (11), return spring plate (12), spring (13), distribution plate (14), coupling (15), plunger cylinder (17), plunger (18), ball retainer seat (19), guide sleeve (20) and slipper (21); The pump housing (1) is the main support structure and houses various components inside; The main shaft end cover (2) is installed at one end of the pump housing (1) to seal and fix the main shaft (6); The inlet and outlet end covers (3) are installed at the other end of the pump housing (1) and are provided with an inlet (4) and an outlet (5); The main shaft (6) passes through the pump body along the central axis of the pump housing (1), is connected to an external power source at one end, and is coaxially connected to the plunger cylinder (17) through the coupling (15) at the other end; The swash plate (11) is fixed inside the pump housing (1) and is at an inclined angle to the axis of the main shaft (6); The plunger (18) reciprocates linearly inside the plunger cylinder (17), and the slipper (21) is installed at one end of the plunger (18) and contacts the swash plate (11); The guide sleeve (20) is installed inside the pump housing (1) to guide the movement of the plunger (18) and the slipper (21); The return spring plate (12) is connected to the spring (13) through the ball retainer seat (19), and presses tightly against the swash plate (11) under the action of the spring (13), driving the plunger (18) and the slipper (21) to rotate circumferentially; The mechanical seal dynamic ring (9) is arranged inside the pump housing (1) and sleeved outside the main shaft (6), and can rotate together with the main shaft (6), and the mechanical seal static ring (8) is arranged inside the main shaft end cover (2) and sleeved outside the main shaft (6), and fits tightly with the mechanical seal dynamic ring (9); The distribution plate (14) is installed inside the pump housing (1) and fits tightly with the end face of the plunger cylinder (17), and cooperates with the plunger cylinder (17) to control the suction and pressure of the liquid.

2. The lightweight and compact swashplate axial piston pump according to claim 1, wherein The pump housing (1) is a product made of duplex stainless steel or a combination of a new composite material and duplex stainless steel, and the size of the pump housing (1) is φ76*109.

3. A lightweight and compact swashplate axial piston pump according to claim 1, characterized in that, The main shaft end cover (2) is provided with multiple groups of circumferentially distributed mounting holes (7) for fixedly installing the pump on other equipment.

4. A lightweight and compact swashplate axial piston pump according to claim 3, characterized in that, The main shaft end cover (2) and the inlet and outlet end covers (3) are respectively fixedly connected to the pump housing (1) through bolts distributed along the circumference.

5. The lightweight compact swashplate axial piston pump according to claim 4, characterized in that, First O-ring (10) and second O-ring (16) are respectively provided at the connection positions of the main shaft end cover (2), the inlet and outlet end covers (3) and the pump housing (1).

6. A lightweight and compact swashplate axial piston pump according to claim 1, characterized in that, Filter meshes are provided at both the inlet (4) and the outlet (5) of the inlet and outlet end cover (3).

7. A lightweight and compact swashplate axial piston pump according to claim 1, characterized in that, The inclination angle range of the swash plate (11) is 10° - 20°.

8. A lightweight and compact swashplate axial piston pump according to claim 1, characterized in that, The spring (13) is a compression spring product.

9. The lightweight compact swashplate axial piston pump according to claim 1, wherein The clearance between the plunger (18) and the plunger cylinder (17) is 0.005 - 0.012 mm.

10. A lightweight and compact swashplate axial piston pump according to claim 1, characterized in that, The ball retainer seat (19) is a high-strength plastic product.

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