Pumping source

Abstract

The utility model discloses a pump source, which relates to the technical field of hydraulic pressure and comprises an oil return pipe, a main energy accumulator type pump, an auxiliary energy accumulator and an output pipeline, a main piston, a heavy hammer and a driving mechanism are connected in the main energy accumulator type pump, a first working cavity is formed below the main piston, and an oil tank is formed above the main piston; the driving mechanism is connected with the main piston through a clutch; after the clutch is separated, the driving mechanism is separated from the main piston and the heavy hammer, the main piston and the heavy hammer pressurize oil in the first working cavity by means of gravity, and the oil is conveyed outwards through the output pipeline so as to achieve the state of supplying oil outwards. When the clutch is combined, the driving mechanism is used for driving the main piston and the heavy hammer to move upwards, lifting of the main piston and the heavy hammer is achieved, so that oil in an oil tank located above the main piston is pumped and supplemented into a first working cavity, the oil pumping state of the main energy accumulator type pump is achieved, and the auxiliary energy accumulator maintains the state of supplying oil to an output pipeline in a pressure maintaining mode; therefore, the pump source continuously supplies oil to the outside.

Description

Technical Field

[0001] This application belongs to the field of hydraulic technology, specifically relating to a pump source. Background Technology

[0002] Because the weight of a hydraulic system can be reduced by 10% when the system pressure increases from 21MPa to 35MPa, resulting in lower costs and smaller volume, high-pressure systems are typically chosen for hydraulic systems. Since piston pumps are easy to operate under high pressure and are readily adaptable to variable flow rates, high-pressure, high-flow piston pumps have always been a research topic. However, to achieve a tight seal in the circumferential gaps of the piston, the mating clearance in a piston pump can be made very small, for example, 3-6μm. Therefore, high-pressure piston pumps require very low levels of oil contamination, resulting in high costs.

[0003] Modern hydraulic systems prioritize high efficiency and long lifespan. Therefore, in addition to high pressure, they also require large flow rates and durability. Modern pumps typically achieve flow rates of 1-1000 L / min and rated speeds of 1000-4000 rpm. With a constant speed, a larger plunger area results in a larger flow rate. A high-pressure plunger pump with a flow rate of 1000 L / min is bulky and expensive. Furthermore, the volumetric efficiency of new pumps is generally only 90%-95%, and the higher the flow rate, the greater the loss of volumetric efficiency. Even if the problem of oil contamination in plunger pumps is solved, very few plunger pumps can achieve a continuous operating time of over 8000 hours. The main reason for this is that the working flow supplied by the plunger is almost entirely lost due to leakage, leading to failure. Because of leakage, the pump's volumetric efficiency decreases with increasing pressure. After wear, when the machine load increases, the speed will significantly decrease, or even stop, necessitating pump replacement. This further increases operating and maintenance costs.

[0004] Because the piston of a weighted piston accumulator has the energy-saving characteristic of utilizing Earth's gravity and can be made with a relatively large diameter to provide a larger flow rate, it suffers from unreliable sealing, resulting in pressure that cannot reach the high-pressure characteristics of a plunger pump. It also suffers from slow suction, leading to discontinuous and long intervals in oil supply. Therefore, it is difficult to replace expensive high-flow-rate, high-pressure plunger pumps. To meet the international demand for low-cost, long-life, high-flow-rate, high-pressure plunger pumps, there is an urgent need to develop a stable pump source using a weighted piston accumulator that meets modern requirements for high pressure, high flow rate, and long lifespan. Utility Model Content

[0005] This application provides a pump source to solve the problems of unreliable sealing of the aforementioned heavy-duty piston accumulator, resulting in low pressure and low supply flow, as well as discontinuous oil supply and long intervals due to slow suction. The purpose is to provide a low-cost, stable pump source of heavy-duty piston accumulator type that meets modern needs by solving the high-pressure sealing of a large-diameter piston and combining it with a drive mechanism.

[0006] The technical solution adopted in this application is as follows:

[0007] A pump source includes a return oil pipe, a main accumulator pump, an auxiliary accumulator, and an output pipeline;

[0008] The main accumulator pump is equipped with a main piston, a counterweight, and a drive mechanism. The drive mechanism is connected to the main piston via a clutch, and the counterweight is positioned above the main piston. A first working chamber is located below the main piston in the main accumulator pump, and an oil tank is formed above the main piston. The oil tank is connected to the first working chamber via an input pipe, and the first working chamber is connected to the hydraulic equipment via an output pipe. The hydraulic equipment is connected to the oil tank via a return pipe, thus forming an oil circulation loop.

[0009] When the clutch is engaged, the drive mechanism drives the main piston and the counterweight to move upward, thereby lifting the main piston and the counterweight to draw oil from the oil tank above the main piston and replenish the first working chamber, thus achieving the oil pumping state. When the clutch is disengaged, the drive mechanism disengages from the main piston and the counterweight, and the main piston and the counterweight pressurize the oil in the first working chamber by gravity, thus delivering the oil outward through the output pipeline, thereby achieving the external oil supply state.

[0010] The auxiliary accumulator is equipped with a second working chamber. The first working chamber is connected to the second working chamber through a second control valve to complete the purpose of supplying oil to the auxiliary accumulator for energy storage. The second working chamber can assist the first working chamber in jointly transporting oil to the outside through the output pipeline, or transport high-pressure oil to the outside through the output pipeline when the main accumulator pump is in the oil pumping state, or assist the main accumulator pump in adjusting the pressure or flow of the output pipeline when the main accumulator pump is transporting oil to the outside through the output pipeline, so as to complete the continuous and stable oil supply output of the pump source.

[0011] The oil tank and main accumulator pump are located below ground level, while the hydraulic equipment is located above ground level. The return pipeline of the hydraulic equipment is connected above the return oil pipeline, so that the hydraulic oil can flow back to the oil tank by gravity through the return oil pipeline.

[0012] The oil tank is connected to the first working chamber of the main accumulator pump via an input pipeline and a first control valve; the first control valve can control the oil in the first working chamber to prevent it from flowing back to the oil tank through the input pipeline.

[0013] A filter storage tank is also provided between the first working chamber and the second control valve of the main accumulator pump; a filter screen is connected between the filter storage tank and the first working chamber; when the main piston is in the working state, the main piston moves down so that the oil in the first working chamber can pass through the filter screen into the filter storage tank, and then be output to the auxiliary accumulator or output pipeline through the second control valve; the filter screen is set at an angle, with a slope requirement of 0.003 meters to 0.005 meters per meter, so that impurities can be filtered and flow to the drain port by liquid flow and gravity, which facilitates the self-cleaning and self-maintenance of the filter screen.

[0014] A centrifugal pump is also installed on the input pipeline. The oil outlet of the centrifugal pump is connected to the first working chamber of the main accumulator pump through a first control valve. The oil inlet of the centrifugal pump is set at the bottom of the oil tank on the upper part of the main accumulator pump through a hose. A level sensor for measuring the oil level is installed in the oil tank. The level sensor is set with a lower threshold. When the oil level is lower than the lower threshold, the centrifugal pump is turned off. The centrifugal pump is used to increase the oil supply to the first working chamber of the input pipeline quickly.

[0015] The auxiliary accumulator adopts a pneumatic accumulator and / or a piston-weight accumulator; the stable output pressure of the first working chamber of the main accumulator pump is set to P1, and the stable output pressure of the second working chamber of the auxiliary accumulator is set to P2, then 95% P1≤P2<P1; the maximum capacity of the second working chamber of the auxiliary accumulator is V2, the maximum flow rate supplied to the hydraulic equipment is Q, and the time required for the main accumulator pump to be in the oil pumping state is t, then V2≥Q×t.

[0016] The main accumulator pump is configured such that: the main piston can move upward under the drive of the drive mechanism; during the process of the main piston moving to the upper limit position, the oil in the tank enters the first working chamber through the input pipeline, realizing the oil pumping state of the main accumulator pump; during the process of the main piston moving downward from the upper limit position by gravity, the main accumulator pump delivers high-pressure oil to the outside through the output pipeline, realizing the working state of the main accumulator pump; when the main piston falls to the bottom of the main accumulator pump cylinder, the main accumulator pump completes the external oil supply.

[0017] The auxiliary accumulator is configured such that its set pressure is between 95% and 99% of the set pressure of the main accumulator pump. When the main accumulator pump is in operation, the oil in the output pipeline can enter the second working chamber of the auxiliary accumulator, enabling the auxiliary accumulator to be in standby oil storage and auxiliary oil supply states, as well as to absorb pressure fluctuations in the oil in the output pipeline. When the main accumulator pump is not in operation, the second working chamber of the auxiliary accumulator feeds high-pressure oil back to the output pipeline until the main accumulator pump re-enters operation.

[0018] The main piston can move upward under the drive of the drive mechanism; the drive mechanism includes a motor, a first fixed pulley, a second fixed pulley, a first movable pulley, a first connecting rope, and a first pull rope; the first movable pulley is connected to the main piston through the first connecting rope; one end of the first pull rope is fixed, and the other end of the first pull rope passes around the first movable pulley and the first fixed pulley and is wound and connected to the second fixed pulley; the second fixed pulley is connected to the output shaft of the motor; the motor drives the second fixed pulley to rotate, so that the first pull rope can be retracted on the second fixed pulley, and the first movable pulley and the first connecting rope move upward to realize the upward movement of the main piston;

[0019] A clutch and a brake are installed between the motor and the second fixed pulley. When the main piston moves down from the upper limit position by gravity, the centrifugal pump is turned off, the clutch and brake are released, and the drive mechanism is separated from the second fixed pulley. As a result, the main piston moves down by gravity, and the capacity of the oil tank increases as the main piston moves down.

[0020] A first limiting plate is detachably connected above the main piston in the main accumulator pump. The limiting plate is connected around at least part of the inner wall of the first cylinder and can protrude from the inner wall of the first cylinder by a preset height to limit the upward movement of the main piston. A position sensor is set on the first limiting plate. When the main piston moves to the upper limit position, an alarm is issued and the controller is linked to stop the drive mechanism.

[0021] The main piston has a main sealing groove and a floating sealing groove on its periphery; the main sealing groove and the floating sealing groove are connected by a sealing structure, and the floating sealing groove is set on both sides of the main sealing groove along the axis of the main piston; the main piston has an oil reservoir; a pressure regulating piston is set at the bottom of the oil reservoir, and a cover plate is set at the top of the oil reservoir. The cover plate seals the oil in the oil reservoir between the pressure regulating piston and the cover plate through a static sealing ring; a safety valve is set on the cover plate to prevent the oil pressure in the oil reservoir from being too high, which could cause the sealing tire or support tire to burst.

[0022] The sealing structure includes a sealing tire and a supporting tire. The sealing tire is disposed in the main sealing groove, and the supporting tire is disposed in the floating sealing groove. The main piston has a first filling channel, a second filling channel, and a third filling channel. The first filling channel connects the oil storage chamber to the sealing tire through a first quick connector. The second filling channel connects the oil storage chamber to the supporting tire above the main sealing groove through a second quick connector. The third filling channel connects the oil storage chamber to the supporting tire below the main sealing groove through a third quick connector.

[0023] The pressure regulating piston includes a large piston and a small piston connected to each other. The large piston and the small piston are concentric cylindrical structures. There is a movable gap between the outer cylindrical surface of the large piston and the small piston and the cylindrical hole wall in the main piston used to install the pressure regulating piston, so that the pressure regulating piston can move up and down relative to the main piston.

[0024] As the main piston moves downward under gravity, the small piston at the bottom of the pressure regulating piston is subjected to the high-pressure oil at the bottom of the main piston. The force is transmitted to the oil in the oil reservoir at the top of the pressure regulating piston, which pressurizes the oil and pushes the sealing tire of the main sealing groove or the support tire in the floating sealing groove on the periphery of the main piston to expand further, so as to prevent the oil in the first working chamber at the bottom of the main piston from entering the upper oil tank through the gap.

[0025] When the main piston moves upward via the drive mechanism, the bottom of the pressure regulating piston is no longer affected by the high-pressure oil at the bottom of the main piston and falls due to gravity. This causes the oil pressure in the oil reservoir at the top of the pressure regulating piston to decrease, which in turn causes the sealing or support at the main piston seal to contract. This reduces the sealing pressure between the main piston and the cylinder wall, allowing the oil at the top of the main piston to wet the cylinder wall contact surface. This reduces the frictional resistance of the cylinder wall against the main piston when it is lifted, facilitating the rapid upward movement of the main piston. It also allows the oil in the tank to lubricate and carry away the frictional heat of the seal through the gap between the main piston and the cylinder wall.

[0026] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0027] 1. A pump source, comprising a return oil pipe, a main accumulator pump, an auxiliary accumulator, and an output pipe; the main accumulator pump is internally connected to a main piston, a counterweight, and a drive mechanism, the drive mechanism being connected to the main piston via a clutch, and the counterweight being positioned above the main piston; a first working chamber is formed below the main piston within the main accumulator pump, and an oil tank is formed above the main piston within the main accumulator pump; the oil tank is connected to the first working chamber via an input pipe, the first working chamber is connected to a hydraulic device via an output pipe, and the hydraulic device is connected to the oil tank via a return oil pipe, thereby forming an oil circulation loop; when the clutch is engaged, the drive mechanism is used to drive the main piston and the counterweight to move upward, thereby lifting the main piston and the counterweight to draw oil from the oil tank above the main piston and replenish it to the first working chamber, achieving an oil pumping state; When the clutch disengages, the drive mechanism separates from the main piston and counterweight. The main piston and counterweight pressurize the oil in the first working chamber by gravity, and deliver the oil outward through the output pipeline to achieve the external oil supply state. The auxiliary accumulator is equipped with a second working chamber. The first working chamber is connected to the second working chamber through a second control valve to complete the purpose of supplying oil and storing energy to the auxiliary accumulator. The second working chamber can assist the first working chamber in delivering oil outward through the output pipeline, or deliver high-pressure oil outward through the output pipeline alone when the main accumulator pump is in the oil pumping state, or assist the main accumulator pump in adjusting the pressure or flow of the output pipeline when the main accumulator pump delivers oil outward through the output pipeline, so as to achieve a continuous and stable oil supply output from the pump source.

[0028] The main accumulator pump is based on a weighted piston accumulator and has a suction drive mechanism. When pumping oil, the auxiliary accumulator can maintain pressure and supply oil to the output pipeline. This solves the problem of discontinuous oil supply and long intervals caused by slow suction in the weighted piston accumulator. It realizes a stable pump source with high pressure, high flow rate and long service life for the weighted piston accumulator.

[0029] 2. The oil tank and main accumulator pump are installed below ground level, while the hydraulic equipment is installed above ground level. The return pipeline of the hydraulic equipment is connected above the return oil pipe, so that the oil of the hydraulic equipment can flow back to the oil tank through the return oil pipe by gravity, thereby achieving the purpose of energy-saving oil recovery by utilizing gravity.

[0030] 3. A filter storage tank is also provided between the first working chamber and the second control valve of the main accumulator pump; a filter screen is connected between the filter storage tank and the first working chamber; when the main piston is in the working state, the main piston moves down so that the oil in the first working chamber can be forced through the filter screen into the filter storage tank, and then output to the auxiliary accumulator or output pipeline through the second control valve; the filter screen is inclined, and the slope requirement is 0.003 meters to 0.005 meters per meter, so as to facilitate the flow of impurities to the drain port by the liquid flow and gravity, and facilitate the self-cleaning and self-maintenance of the filter screen.

[0031] 4. The auxiliary accumulator adopts a pneumatic accumulator and / or a piston-weight accumulator; the stable output pressure of the first working chamber of the main accumulator pump is set to P1, and the stable output pressure of the second working chamber of the auxiliary accumulator is set to P2, then 95% P1≤P2<P1; the maximum capacity of the second working chamber of the auxiliary accumulator is V2, the maximum flow rate supplied to the hydraulic equipment is Q, and the time required for the main accumulator pump to be in the oil pumping state is t, then V2≥Q×t. 5. A centrifugal pump is also installed on the input pipeline. The oil outlet of the centrifugal pump is connected to the first working chamber of the main accumulator pump through the first control valve. The oil inlet of the centrifugal pump is set at the bottom of the oil tank on the upper part of the main accumulator pump through a hose. A level sensor for measuring the oil level is installed in the oil tank. The level sensor is set with a lower threshold. When the oil level is lower than the lower threshold, the centrifugal pump is shut down. The centrifugal pump is used to increase the oil supply to the first working chamber of the input pipeline quickly, shorten the time required for the main accumulator pump to pump oil (t), increase the working time for the output pressure in the output pipeline to stabilize at the set P1, and also help to reduce the maximum capacity of the second working chamber of the auxiliary accumulator (V2≥Q×t), thereby reducing the cost of the auxiliary accumulator and achieving the effect of reducing the overall cost of the stable pump source of the weighted piston accumulator.

[0032] 6. By cooperating with the main accumulator pump and the auxiliary accumulator, a stable output of high pressure and high flow rate is achieved. When the main piston moves down under the action of the counterweight, the capacity of the oil tank increases with the movement of the piston. The oil in the tank permeates through gravity, lubricating the gaps around the piston and reducing friction, so as to ensure that the oil in the first working chamber at the bottom of the main piston is supplied with a stable pressure when the main piston moves down.

[0033] A pressure regulating piston is connected inside the main piston. As the main piston moves downwards under gravity, the small piston at the bottom of the pressure regulating piston, acting on the high-pressure oil below the main piston, transmits the force to the oil in the reservoir at the top of the large piston of the pressure regulating piston. This pressurizes the oil, causing the sealing element in the main sealing groove or the support element in the floating sealing groove around the main piston to expand further, preventing oil in the first working chamber at the bottom of the main piston from entering the upper oil tank through gaps. When the main piston moves upwards driven by the drive mechanism, the bottom of the pressure regulating piston no longer falls under the high-pressure oil below the main piston, causing the oil pressure in the upper oil reservoir of the pressure regulating piston to decrease. This causes the sealing element or support element at the main piston seal to contract, reducing the sealing friction between the main piston and the cylinder wall, facilitating rapid upward movement of the main piston, and allowing the oil in the oil tank to lubricate and carry away the frictional heat between the main piston and the cylinder wall. This ensures sufficient sealing between the main piston and the cylinder wall during operation while preventing increased friction that could hinder piston movement.

[0034] 7. The sealing structure involved in this application effectively solves the sealing problem of large-diameter pistons, and resolves the problem of unreliable sealing in the aforementioned heavy-duty piston accumulator, which leads to low pressure and small supply flow. The working area and leakage area of ​​the plunger pump are approximately equal to the plunger area divided by the plunger circumference, which equals the plunger diameter D. In other words, the larger the plunger area, the stronger its effective working capacity. Increasing the plunger diameter can increase the working area and increase the supply. The heavy-duty piston works by utilizing the Earth's gravity, which is more energy-efficient and does not require complex structures such as slippers in the plunger pump. It can provide stable high pressure and a large stable flow, thereby meeting the demand for a stable pump source with high pressure, large flow, long service life, and low cost. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0036] Figure 1 This is a schematic diagram of a pump source according to one embodiment of this application;

[0037] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0038] In the picture,

[0039] 1. Return oil pipe; 2. Main accumulator pump; 21. Main piston; 22. Counterweight; 23. Drive mechanism; 231. First fixed pulley; 232. Second fixed pulley; 233. First movable pulley; 234. First connecting rope; 235. First pull rope; 3. Filter screen; 4. First working chamber; 5. Oil tank; 6. Second working chamber; 7. Output pipeline; 8. Input pipeline; 9. First control valve; 10. Second control valve; 11. Auxiliary accumulator; 12. Secondary piston; 13. Filter storage tank; 14. Centrifugal pump; 15. Oil storage chamber; 16. Pressure regulating piston; 161. Small piston; 162. Large piston; 17. Sealing tire; 18. Support tire; 19. Cover plate; 20. Filter; 24. Hydraulic equipment. Detailed Implementation

[0040] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0042] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a communication 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0045] This application relates to a pump source, such as Figure 1-2 As shown, the system includes a return oil pipe 1, a main accumulator pump 2, an auxiliary accumulator 11, and an output pipe 7. The main accumulator pump 2 is connected to a main piston 21, a counterweight 22, and a drive mechanism 23. The drive mechanism 23 is connected to the main piston 21 via a clutch, and the counterweight 22 is positioned above the main piston 21. A first working chamber 4 is formed below the main piston 21 within the main accumulator pump 2, and an oil tank 5 is formed above the main piston 21. The oil tank is connected to the first working chamber 4 via an input pipe 8, and the first working chamber 4 is connected to a hydraulic device 24 via an output pipe 7. The hydraulic device 24 is connected to the oil tank 5 via the return oil pipe 1, thus forming an oil circulation loop. When the clutch is engaged, the drive mechanism 23 drives the main piston 21 and the counterweight 22 to move upwards, thereby lifting the main piston 21 and the counterweight 22 to draw oil from the oil tank 5 above the main piston 21 and replenish the first working chamber 4. Inside, the pumping state is achieved; when the clutch is disengaged, the drive mechanism 23 disengages from the main piston 21 and the counterweight 22, and the main piston 21 and the counterweight 22 pressurize the oil in the first working chamber 4 by gravity, and deliver the oil to the outside through the output pipeline 7 to achieve the external oil supply state; the auxiliary accumulator 11 is provided with a second working chamber 6, and the first working chamber 4 is connected to the second working chamber 6 through the second control valve 10 to complete the purpose of supplying oil and storing energy to the auxiliary accumulator 11; the second working chamber 6 can assist the first working chamber 4 in jointly delivering the oil to the outside through the output pipeline 7, or deliver high-pressure oil to the outside through the output pipeline 7 alone when the main accumulator pump 2 is in the pumping state, or assist the main accumulator pump 2 in adjusting the pressure or flow of the output pipeline 7 when the main accumulator pump 2 delivers oil to the outside through the output pipeline 7, so as to complete the continuous and stable oil supply output of the pump source.

[0046] The main accumulator pump 2 includes a first cylinder, a main piston 21, a first counterweight 22, a pressure regulating piston 16, and a cover plate 19. The main piston 21 is connected inside the first cylinder, and the first counterweight 22 is positioned above the main piston 21. An oil storage chamber 15 is opened inside the main piston 21. The pressure regulating piston 16 is connected to the bottom opening of the oil storage chamber 15, and the cover plate 19 is connected to the top opening of the oil storage chamber 15. A sealing structure is connected between the outer periphery of the main piston 21 and the first cylinder. The sealing structure includes a sealing ring 17. By adjusting the pressure inside the sealing ring 17, a movable gap is created between the main piston 21 and the first cylinder when the main piston 21 moves upward, allowing the oil in the oil tank 5 to lubricate the main piston 21 through the movable gap. The sealing structure also creates a sealed contact between the main piston 21 and the first cylinder when the main piston 21 moves downward, allowing the main piston 21 to pressurize the oil in the first working chamber 4 of the main accumulator pump 2 under the action of gravity.

[0047] In operation, as the main piston 21 moves downward under the action of the counterweight 22, the capacity of the oil tank 5 increases with the downward movement of the piston. The oil in the oil tank 5 permeates through gravity, lubricating the gaps around the piston and reducing friction. This ensures that the oil in the first working chamber 4 at the lower part of the main piston 21 receives a stable pressure as the main piston 21 moves downward. The oil in the first working chamber 4 outputs stable pressure oil to the external pipeline as the main piston 21 moves downward. This oil supplies the equipment and also provides high-pressure oil to the auxiliary accumulator 11, causing the auxiliary piston 12 in the auxiliary accumulator 11 to rise to a predetermined position. In this position, the auxiliary piston 12 is in a standby energy storage state and an auxiliary oil supply state. When the main piston 21 falls to the bottom of the cylinder of the main accumulator pump 2, the first working state of the main accumulator pump 2 supplying oil to the outside is completed.

[0048] The main piston 21 can move upward under the drive of the drive mechanism 23, and transfer the oil in the oil tank 5 with a reduced capacity to the first working chamber 4 at the lower part of the main piston 21 through the input pipe 8, realizing the second working state of oil suction; when the main accumulator pump 2 is in the second working state, the high-pressure oil required by the equipment is supplied by the auxiliary accumulator 11 in the energy storage state; so that the oil in the auxiliary accumulator 11 enters the hydraulic equipment 24, and the oil in the hydraulic equipment 24 flows into the oil tank 5 through the return oil pipe 1, and the hydraulic oil in the oil tank 5 is transferred to the first working chamber 4 at the lower part of the main piston 21; when the main piston 21 rises to the limit position, the main piston 21 is in the standby energy storage state, and the main accumulator pump 2 switches to the first working state of supplying oil to the outside, thereby realizing the working cycle of pumping oil supply and suction.

[0049] In a preferred embodiment, the oil tank 5 and the main accumulator pump 2 are located below ground level, while the hydraulic equipment 24 is located above ground level. The return pipeline of the hydraulic equipment 24 is connected above the return oil pipe 1, so that the oil of the hydraulic equipment 24 can flow back to the oil tank 5 by gravity through the return oil pipe 1, thereby achieving the purpose of energy saving.

[0050] The main piston 21 divides the first cylinder into upper and lower parts. The upper part is the oil tank 5, and the lower part is the first working chamber 4 that outputs stable pressure. The return oil pipe 1 is connected to the return pipeline of the hydraulic equipment 24. The return oil pipe 1 is also connected to the oil tank 5 on the upper part of the main accumulator pump 2. The return oil pipe 1 and the main accumulator pump 2 are both set below the lowest horizontal plane of the hydraulic equipment 24, preferably in the ground. Since the oil tank 5 is set below the horizontal plane of the equipment, the return oil in the return oil pipe 1 or the oil in the oil tank 5 can be recovered into the oil tank 5 by gravity through the return oil pipe 1.

[0051] In a preferred embodiment, the oil tank 5 is connected to the first working chamber 4 in the main accumulator pump 2 via the input pipe 8 and the first control valve 9; the first control valve 9 can control the oil in the first working chamber 4 to prevent it from flowing back to the oil tank 5 through the input pipe 8.

[0052] Furthermore, the first control valve 9 is preferably a first check valve.

[0053] In a preferred embodiment, a filter storage tank 13 is also provided between the first working chamber 4 and the second control valve 10 of the main accumulator pump 2; a filter screen 3 is connected between the filter storage tank 13 and the first working chamber 4; when the main piston 21 is in the working state, the main piston 21 moves down so that the oil in the first working chamber 4 can enter the filter storage tank 13 through the filter screen 3, and then be output to the auxiliary accumulator 11 or the output pipeline 7 through the second control valve 10.

[0054] The first working chamber 4 of the main accumulator pump 2 is connected to the auxiliary accumulator 11 and the output pipeline 7 respectively through the second control valve 10. By setting the second control valve 10 between the main accumulator pump 2 and the second working chamber 6, the second control valve 10 can control the oil in the first working chamber 4 of the main accumulator pump 2 to enter the second working chamber 6 of the auxiliary accumulator 11, and can also control the oil in the first working chamber 4 of the main accumulator pump 2 to enter the output pipeline 7.

[0055] Furthermore, the second control valve 10 is preferably a second check valve; a filter storage tank 13 is also provided between the first working chamber 4 of the main accumulator pump 2 and the second control valve 10, which can realize the output of the oil in the first working chamber 4 after filtration, and a second check valve is connected in the output pipeline 7 connecting the filter pump source tank to the hydraulic equipment 24 and the auxiliary accumulator 11. The second check valve is used to ensure that the oil flows from the filter pump source tank to the hydraulic equipment 24 and the auxiliary accumulator 11.

[0056] It should be noted that the walls of the filter storage tank 13 can be made of stainless steel, and the exterior can be reinforced with cement to withstand pressure, requiring a resistance of 90 MPa and a safety factor of 3, thus making the filter storage tank 13 economical and practical.

[0057] In a preferred embodiment, a centrifugal pump 14 is also provided on the input pipeline 8. The oil outlet of the centrifugal pump 14 is connected to the first working chamber 4 of the main accumulator pump 2 through the first control valve 9. The oil suction port of the centrifugal pump 14 is provided at the bottom of the oil tank 5 on the upper part of the main accumulator pump 2 through a hose. A liquid level sensor for measuring the liquid level is provided in the oil tank 5. The liquid level sensor is set with a lower limit threshold. When the liquid level is lower than the lower limit threshold, the centrifugal pump 14 is turned off. The centrifugal pump 14 is used to increase the oil supply from the input pipeline 8 to the first working chamber 4 quickly.

[0058] Because the high-pressure oil output from the lower part of the 22-type accumulator is roughly equal to the amount of oil returned to the tank 5 via the return pipe 1 after the equipment is used, the bottom of the tank 5 drops by the same number of millimeters as the piston moves down. In addition to doing work by descending under gravity, the piston can also be lifted by a piston lifting device. During the lifting process, the bottom of the tank 5 rises by the same number of millimeters as the piston moves up. A small portion of the oil can flow back to the lower part of the piston through the gap between the piston and the cylinder wall, but this may also create a vacuum at the lower part of the piston. Although the oil in the tank 5 can flow back to the bottom of the accumulator piston as the piston lifting device rises by connecting the oil in the upper part of the piston with the bottom of the piston through a pipeline, this method results in a larger lifting device with higher power and size, higher safety requirements for the lifting rope, and insufficient speed of oil replenishment.

[0059] Therefore, in addition to using the input pipeline 8 to output the oil in the oil tank 5 to the first working chamber 4, this application can also install a centrifugal pump 14 on the input pipeline 8. The oil outlet of the centrifugal pump 14 is connected to the first working chamber 4 of the main accumulator pump 2 through the first control valve 9, and the oil suction port of the centrifugal pump 14 is set at the bottom of the oil tank 5 above the main accumulator pump 2 through a hose; so that the oil in the oil tank 5 is transported to the first working chamber 4 through the centrifugal pump 14, increasing the return oil force from the oil tank 5 into the first working chamber 4.

[0060] The centrifugal pump 14 extends into the oil tank 5 via a flexible and convenient suction input pipe 8. The strong suction force quickly fills the bottom of the accumulator piston with oil and assists in the piston's upward movement, reducing the power and size of the lifting device while increasing the hoisting speed. Similar to the rapid oil suction process of a pump, this ensures timely oil replenishment. The return stroke oil suction time t of the accumulator piston is short, reducing the capacity of the auxiliary accumulator 11. If the average oil supply to the equipment is Q, then the capacity V of the auxiliary accumulator 11 is V ≥ Q × t.

[0061] The capacity of the auxiliary accumulator 11 can be a combination of a fast-responding airbag accumulator and a pressure-stable piston-weight 22 type accumulator. The average oil supply to the equipment is Q. Then, the capacity of the auxiliary accumulator 11, V≥Q×t, meets the requirements of fast response and stable pressure. The pressure used is the same as that of the main accumulator pump 2. Program control is only used when the main accumulator pump 2 is pumping oil or stuck.

[0062] In a preferred embodiment, the auxiliary accumulator 11 adopts a pneumatic accumulator and / or a piston-weight accumulator 22; the stable output pressure of the first working chamber 4 of the main accumulator pump 2 is set to P1, and the stable output pressure of the second working chamber 6 of the auxiliary accumulator 11 is set to P2, then 95% P1≤P2<P1; the maximum capacity of the second working chamber 6 of the auxiliary accumulator 11 is V2, the maximum flow rate supplied to the hydraulic equipment 24 is Q, and the time required for the main accumulator pump 2 to pump oil is t, then V2≥Q×t.

[0063] In a preferred embodiment, the main accumulator pump 2 is configured such that: the main piston 21 can move upward under the drive of the drive mechanism 23; during the process of the main piston 21 moving upward to the upper limit position, the oil in the oil tank 5 enters the first working chamber 4 through the input pipe 8, realizing the oil pumping state of the main accumulator pump 2; during the process of the main piston 21 moving downward from the upper limit position by gravity, the main accumulator pump 2 delivers high-pressure oil to the outside through the output pipe 7, realizing the working state of the main accumulator pump 2; when the main piston 21 falls to the bottom of the cylinder of the main accumulator pump 2, the main accumulator pump 2 completes the external oil supply.

[0064] The auxiliary accumulator 11 is configured such that its set pressure is between 95% and 99% of the set pressure of the main accumulator pump 2; when the main accumulator pump 2 is in operation, the oil in the output pipeline 7 can enter the second working chamber 6 of the auxiliary accumulator 11, so that the auxiliary accumulator 11 is in a standby oil storage state and an auxiliary oil supply state, and absorbs the pressure fluctuation of the oil in the output pipeline 7; when the main accumulator pump 2 is not in operation, the second working chamber 6 of the auxiliary accumulator 11 feeds back high-pressure oil to the output pipeline 7 until the main accumulator pump 2 re-enters the operating state;

[0065] The main piston 21 can move upward under the drive of the drive mechanism 23; the drive mechanism 23 includes a motor, a first fixed pulley 231, a second fixed pulley 232, a first movable pulley 233, a first connecting rope 234, and a first pull rope 235; the first movable pulley 233 is connected to the main piston 21 through the first connecting rope 234; one end of the first pull rope 235 is fixed, and the other end of the first pull rope 235 passes around the first movable pulley 233 and the first fixed pulley 231 and is wound around and connected to the second fixed pulley 232; the second fixed pulley 232 is connected to the output shaft of the motor; the second fixed pulley 232 is driven to rotate by the motor, so that the first pull rope 235 can be retracted on the second fixed pulley 232, and the first movable pulley 233 and the first connecting rope 234 move upward to realize the upward movement of the main piston 21;

[0066] A clutch and a brake are provided between the motor and the second fixed pulley 232. When the main piston 21 moves down from the upper limit position by gravity, the centrifugal pump 14 is turned off, the clutch and brake are released, and the drive mechanism 23 is separated from the second fixed pulley 232. As a result, the main piston 21 moves down by gravity, and the capacity of the oil tank 5 increases as the main piston 21 moves down.

[0067] The motor of the drive mechanism 23 can drive the second fixed pulley 232 to rotate, so that the second connecting rope can drive the central shaft of the first moving pulley 233 to move up and down, thereby driving the second connecting rope and the main piston 21 to rise along the cylinder body; during the rise of the main piston 21, in order to prevent the oil from sucking in air and causing air bubbles to precipitate, and in order to shorten the time t, the centrifugal pump 14 is turned on so that the oil in the oil tank 5 is transferred to the first working chamber 4 at the lower part of the main piston 21.

[0068] The main piston 21 can move downwards by its own gravity, detached from the control of the drive mechanism 23. Therefore, a clutch and a brake are provided between the motor and the second fixed pulley 232. When the main piston 21 moves downwards from the upper limit position by gravity, the centrifugal pump 14 is turned off, and the clutch and brake are released. The clutch separates the drive mechanism 23 from the second fixed pulley 232, so the main piston 21 moves downwards by gravity. As the main piston 21 moves downwards, the capacity of the oil tank 5 increases. The oil in the oil tank 5 permeates by gravity, lubricating the gaps around the piston and reducing friction. This ensures that the oil in the first working chamber 4 at the lower part of the main piston 21 is given a stable pressure when the main piston 21 moves downwards. As a result, the oil is delivered to the hydraulic equipment 24 and the second working chamber 6 of the auxiliary accumulator 11 through the output pipeline 7.

[0069] In addition, a filter 20 is installed between the output pipeline 7 and the hydraulic equipment 24, and the oil on the output pipeline 7 flows to the hydraulic equipment 24 through the filter 20.

[0070] In a preferred embodiment, a first limiting plate is detachably connected to the main accumulator pump 2 above the main piston 21. The first limiting plate is connected around at least part of the inner wall of the first cylinder and can protrude from the inner wall of the first cylinder by a preset height to limit the upward movement of the main piston 21. A position sensor is set on the first limiting plate. When the main piston 21 moves to the upper limit position, an alarm is issued and the controller is linked to stop the drive mechanism 23.

[0071] The first limiting plate is detachably connected to the main accumulator pump 2, allowing it to be removed from the main accumulator pump 2 for easy initial installation and maintenance of the main piston 21. When the auxiliary accumulator 11 is selected as the piston counterweight 22 type accumulator, a second limiting plate is connected above the auxiliary piston 12 inside the auxiliary accumulator 11. The second limiting plate is connected around at least part of the inner wall of the second cylinder, and the second limiting plate can protrude from the inner wall of the second cylinder at a preset height to limit the upward movement of the auxiliary piston 12.

[0072] In a preferred embodiment, a main sealing groove and a floating sealing groove are formed around the main piston 21; a sealing structure is connected within the main sealing groove and the floating sealing groove, and the floating sealing groove is respectively arranged on both sides of the main sealing groove along the axial direction of the main piston 21; the main piston 21 has an oil reservoir 15; a pressure regulating piston 16 is provided at the bottom of the oil reservoir 15, and a cover plate 19 is provided at the top of the oil reservoir 15. The cover plate 19 seals the oil in the oil reservoir 15 between the pressure regulating piston 16 and the cover plate 19 through a static sealing ring; a safety valve is provided on the cover plate 19 to prevent the oil pressure in the oil reservoir 15 from being too high, which could cause the sealing tire 17 or the support tire 18 to burst; the main sealing groove can be one or two in a group;

[0073] The sealing structure includes a sealing tire 17 and a supporting tire 18. The sealing tire 17 is disposed in the main sealing groove, and the supporting tire 18 is disposed in the floating sealing groove. The main piston 21 has a first filling channel, a second filling channel, and a third filling channel. The first filling channel connects the oil storage chamber 15 to the sealing tire 17 through a first quick connector. The second filling channel connects the oil storage chamber 15 to the supporting tire 18 above the main sealing groove through a second quick connector. The third filling channel connects the oil storage chamber 15 to the supporting tire 18 below the main sealing groove through a third quick connector.

[0074] Specifically, the first sealing assembly, disposed within the main sealing groove, includes an upper support ring, a sealing element 17, a sealing slip ring, and a lower support ring; the upper support ring is connected to the upper wall of the main sealing groove, and the lower support ring is connected to the lower wall of the main sealing groove; the sealing element 17 is disposed between the upper and lower support rings, and the sealing slip ring is disposed between the sealing element 17 and the cylinder wall; the second guiding sealing assembly, symmetrically disposed within floating sealing grooves on both sides of the main sealing groove, includes a limiting ring, a support element 18, an inner support ring, and a floating sealing guide ring; the limiting ring is connected to the groove wall of the floating sealing groove on the side closest to the main sealing groove, the inner support ring is connected to the bottom of the floating sealing groove, the support element 18 is disposed within the outer groove of the inner support ring and adjacent to the limiting ring; the floating sealing guide ring is disposed between the support element 18 and the cylinder wall, and the sealing section of the floating sealing guide ring is adjacent to the limiting ring, with the guiding section of the floating sealing guide ring in elastic contact with the inner support ring.

[0075] In addition, the main piston 21 is provided with a first filling channel, a second filling channel and a third filling channel; the first filling channel connects the oil storage chamber 15 to the sealing tire 17 through a first quick connector; the second filling channel connects the oil storage chamber 15 to the support tire 18 above the main sealing groove through a second quick connector; the third filling channel connects the oil storage chamber 15 to the support tire 18 below the main sealing groove through a pressure regulating piston 16.

[0076] In addition, a safety valve is provided in the cover plate 19 to prevent the oil pressure in the oil reservoir 15 from being too high, which could cause the sealing tire 17 or the support tire 18 to explode.

[0077] In addition, a venting channel is provided inside the cover plate 19, and a one-way overflow safety valve is connected inside the venting channel to discharge excess gas in the oil storage chamber 15.

[0078] In a preferred embodiment, the pressure regulating piston 16 includes a large piston 162 and a small piston 161 connected to each other. The large piston 162 and the small piston 161 are concentric cylindrical structures. A movable gap is formed between the outer cylindrical surfaces of the large piston 162 and the small piston 161 and the cylindrical hole wall in the main piston 21 for mounting the pressure regulating piston 16, allowing the pressure regulating piston 16 to move up and down relative to the main piston 21. When the main piston 21 moves downward under gravity, the small piston 161 at the bottom of the pressure regulating piston 16 is subjected to the high-pressure oil at the bottom of the main piston 21, and the force is transmitted to the oil in the oil reservoir 15 at the top of the large piston 162 of the pressure regulating piston 16, thereby pressurizing the oil and pushing the sealing tire 17 of the main sealing groove or the support tire 18 in the floating sealing groove on the periphery of the main piston 21 to expand further. This prevents the oil in the first working chamber 4 at the lower part of the main piston 21 from entering the upper oil tank 5 through the gap. When the main piston 21 moves upward by the drive mechanism 23, the bottom of the pressure regulating piston 16 is no longer affected by the high pressure oil at the lower part of the main piston 21 and falls by gravity, causing the oil pressure in the oil storage chamber 15 at the upper part of the pressure regulating piston 16 to decrease. This causes the sealing tire 17 or support tire 18 at the sealing point of the main piston 21 to contract, thereby reducing the sealing pressure between the main piston 21 and the cylinder wall. This allows the oil at the upper part of the main piston to wet the contact surface of the cylinder wall, thereby reducing the frictional resistance of the cylinder wall to the main piston when the main piston is lifted. This facilitates the rapid upward movement of the main piston 21 and allows the oil in the oil tank to lubricate and carry away the sealing friction heat in time through the gap between the main piston 21 and the cylinder wall.

[0079] Specifically, the end face of the small piston 161 is used to contact the oil in the first working chamber 4, and the end face of the large piston 162 is located inside the oil storage chamber 15 of the main piston 21 of the main accumulator pump 2. The size of the small piston 161 is smaller than that of the large piston 162. Therefore, the circular area A1 of the small piston 161 in contact with the oil is smaller than the circular area A2 = πR^2 of the large piston 162 in contact with the oil. The pressure at the bottom of the main piston 21 is P1, and the pressure in the oil storage chamber 15 is P2 ≤ 1MPa. If P1 = 30MPa, P1 × A1 = P2 × A2, and the circular area A1 of the small piston in contact with the oil is A1 = πr^2, where r is the radius of the small piston, preferably 10mm; then we can obtain:

[0080] =

[0081] Since P2 ≤ 1 MPa, then P2 = If ≤1, then A2=πR^2≥30×πr^2=30×A1, so choose A2=30×A1, R=√30×r=5.5r=55mm, which will meet the requirements.

[0082] It is known that the radius of the circle where the large piston 162 contacts the oil is R=55mm, which ensures that the pressure P in the oil reservoir 15 is ≤1MPa. Since the radius r of the small piston 161 is preferably 10mm, the circumference of the gap 2πr is smaller, making it less likely to leak and cause the pressure in the oil reservoir 15 to exceed 1MPa, thus opening the safety valve. This floating seal, which can be adjusted according to the oil pressure in the piston, allows the main piston 21 to be in a stable working state, so that the oil passes through the first working chamber 4 of the main accumulator pump 2, is filtered, and enters the second working chamber 6 of the auxiliary accumulator 11 or the output pipeline.

[0083] In addition, the auxiliary accumulator 11 of this application is also connected to a pressure regulating device, which includes a third fixed pulley, a fourth fixed pulley, a second movable pulley, a second connecting rope, and a second pull rope. The second movable pulley is connected to the auxiliary piston 12 through the second connecting rope. One end of the second pull rope is fixed, and the other end of the second pull rope passes around the second movable pulley and the third fixed pulley and is wound around and connected to the fourth fixed pulley. When the auxiliary piston 12 can move upward under the action of the oil in the second working chamber 6, the second movable pulley is in a floating state. When the oil output value in the second working chamber 6 is used for auxiliary oil supply in the hydraulic device 24, the auxiliary piston 12 can move downward under its own weight.

[0084] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0085] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0086] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0087] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0088] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0089] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A pump source, characterized by, The oil return pipe, the main accumulator type pump, the auxiliary accumulator and the output pipeline are included; The main accumulator type pump is connected with a main piston, a weight and a driving mechanism. The driving mechanism is connected with the main piston through a clutch. The weight is arranged above the main piston. A first working chamber is arranged below the main piston in the main accumulator type pump. An oil tank is formed above the main piston in the main accumulator type pump. The oil tank is connected with the first working chamber through an input pipeline. The first working chamber is connected with a hydraulic equipment through an output pipeline. The hydraulic equipment is connected with the oil tank through an oil return pipe, so as to form an oil circulation loop. When the clutch is combined, the driving mechanism is used to drive the main piston and the weight to move upward, so as to realize the lifting of the main piston and the weight. The oil in the oil tank above the main piston is supplemented into the first working chamber, so as to realize the oil pumping state. When the clutch is separated, the driving mechanism is separated from the main piston and the weight. The main piston and the weight rely on the gravity to pressurize the oil in the first working chamber, so as to realize the oil supply state. The auxiliary accumulator is provided with a second working chamber. The first working chamber is connected with the second working chamber through a second control valve, so as to complete the purpose of supplying oil to the auxiliary accumulator. The second working chamber can assist the first working chamber to jointly deliver the oil outward through the output pipeline, or separately deliver the high-pressure oil outward through the output pipeline when the main accumulator type pump is in the oil pumping state, or assist the main accumulator type pump to adjust the pressure or flow of the output pipeline when the main accumulator type pump delivers the oil outward through the output pipeline, so as to complete the continuous and stable oil supply of the pump source.

2. A pump source as claimed in claim 1, wherein, The oil tank and the main accumulator type pump are arranged below the ground. The hydraulic equipment is arranged above the ground. The return pipeline of the hydraulic equipment is connected with the oil return pipe, so that the oil of the hydraulic equipment flows back to the oil tank through the oil return pipe by gravity.

3. A pump source as claimed in claim 2, wherein The oil tank is communicated with the first working chamber in the main accumulator type pump through the input pipeline and the first control valve. The first control valve can control the oil in the first working chamber to not flow back to the oil tank through the input pipeline.

4. The pump source of claim 1, wherein, A filter liquid storage tank is arranged between the first working chamber and the second control valve of the main accumulator type pump. A filter screen is arranged between the filter liquid storage tank and the first working chamber. When the main piston is in the working state, the oil in the first working chamber can enter the filter liquid storage tank through the filter screen, and then be output to the auxiliary accumulator or the output pipeline through the second control valve.

5. The pump source of claim 1, wherein A centrifugal pump is arranged on the input pipeline. The oil outlet of the centrifugal pump is communicated with the first working chamber of the main accumulator type pump through the first control valve. The oil inlet of the centrifugal pump is arranged at the bottom of the oil tank on the upper part of the main accumulator type pump. A liquid level sensor is arranged in the oil tank to measure the liquid level of the oil. The liquid level sensor sets a lower limit threshold. The centrifugal pump is closed when the liquid level of the oil is lower than the lower limit threshold. The centrifugal pump is used to increase the rapid supply of the oil in the input pipeline to the first working chamber.

6. A pump source as defined in claim 1, wherein The auxiliary accumulator adopts an air bag type accumulator and / or a piston heavy hammer type accumulator; the first working chamber of the main accumulator type pump is set to have a stable output pressure P1, the second working chamber of the auxiliary accumulator is set to have a stable output pressure P2, and 95%P1≤P2 7. A pump source as claimed in claim 1, wherein, The main accumulator type pump is configured such that the main piston can be moved upward under the drive of the driving mechanism, and during the upward movement of the main piston to the upper limit position, the oil in the oil tank enters the first working chamber through the input pipeline, thereby realizing the oil pumping state of the main accumulator type pump; when the main piston moves downward from the upper limit position by gravity, the main accumulator type pump delivers high-pressure oil to the outside through the output pipeline, thereby realizing the working state of the main accumulator type pump; when the main piston falls to the bottom of the main accumulator type pump cylinder, the oil supply to the outside is completed; The auxiliary accumulator is configured such that the set pressure of the auxiliary accumulator is between 95% and 99% of the set pressure of the main accumulator type pump; when the main accumulator type pump is in the working state, the oil in the output pipeline can enter the second working chamber of the auxiliary accumulator, so that the auxiliary accumulator is in the standby oil storage state and the auxiliary oil supply state, and absorbs the pressure fluctuation of the oil in the output pipeline; when the main accumulator type pump is in the non-working state, the second working chamber of the auxiliary accumulator supplies high-pressure oil to the output pipeline until the main accumulator type pump reenters the working state; The main piston can be moved upward under the drive of the driving mechanism; the driving mechanism includes a motor, a first fixed pulley, a second fixed pulley, a first movable pulley, a first connecting rope and a first pull rope; the first movable pulley is connected to the main piston through the first connecting rope; one end of the first pull rope is fixed, and the other end of the first pull rope is wound around the first movable pulley, the first fixed pulley and connected to the second fixed pulley; the second fixed pulley is connected to the output shaft of the motor; the motor drives the second fixed pulley to rotate, so that the first pull rope can be recovered on the second fixed pulley, and the upward movement of the first movable pulley and the first connecting rope realizes the upward movement of the main piston; A clutch and a brake device are arranged between the motor and the second fixed pulley; when the main piston moves downward from the upper limit position by gravity, the centrifugal pump is closed, the clutch and the brake are released, so that the driving mechanism is separated from the second fixed pulley, and the main piston moves downward by gravity, so that the capacity of the oil tank increases with the downward movement of the main piston.

8. A pump source as claimed in claim 7, wherein A first limiting plate is detachably connected above the main piston in the main accumulator type pump, the first limiting plate is connected to at least part of the inner wall of the first cylinder body, and the first limiting plate can protrude from the inner wall of the first cylinder body by a predetermined height to limit the upward movement of the main piston; a position sensor is arranged on the first limiting plate, which sends an alarm when the main piston moves to the upper limit position, and a controller is connected in parallel to stop the driving of the driving mechanism.

9. The pump source of claim 1, wherein The main piston is provided with a main sealing groove and a floating sealing groove on the periphery thereof; a sealing structure is connected in the main sealing groove and the floating sealing groove, and the floating sealing groove is arranged on both sides of the main sealing groove along the axial direction of the main piston; the main piston is provided with an oil storage chamber; a pressure regulating piston is arranged at the bottom of the oil storage chamber, and the oil storage chamber is provided with a cover plate at the top thereof, and the oil in the oil storage chamber is sealed between the pressure regulating piston and the cover plate by a static sealing ring; a safety valve is arranged on the cover plate to prevent the sealing bellows or the supporting bellows from being burst due to the excessively high oil pressure in the oil storage chamber; The sealing structure comprises a sealing bellows and a supporting bellows, the sealing bellows is arranged in the main sealing groove, and the supporting bellows is arranged in the floating sealing groove; the main piston is provided with a first liquid filling channel, a second liquid filling channel and a third liquid filling channel; the first liquid filling channel is connected with the sealing bellows in the oil storage chamber through a first quick connector; the second liquid filling channel is connected with the supporting bellows above the main sealing groove in the oil storage chamber through a second quick connector; and the third liquid filling channel is connected with the supporting bellows below the main sealing groove in the oil storage chamber through a third quick connector.

10. A pump source as claimed in claim 9, wherein, The pressure regulating piston comprises a large piston and a small piston connected with each other, the large piston and the small piston are in a concentric cylindrical structure, and an active gap is formed between the outer cylindrical surface of the large piston and the small piston and the wall of the cylindrical hole in the main piston for mounting the pressure regulating piston, so that the pressure regulating piston can move up and down relative to the main piston; When the main piston moves downward by gravity, the bottom small piston of the pressure regulating piston is subjected to the action of high-pressure oil at the lower part of the main piston, and then transmits the force to the oil in the oil storage chamber at the top of the large piston of the pressure regulating piston, so that the oil is pressurized, and the sealing bellows of the main sealing groove or the supporting bellows in the floating sealing groove on the periphery of the main piston is further expanded to prevent the oil in the first working chamber at the lower part of the main piston from entering the oil tank through the gap; When the main piston is driven to move upward by the driving mechanism, the bottom of the pressure regulating piston is no longer subjected to the action of high-pressure oil at the lower part of the main piston and falls by gravity, so that the oil pressure in the oil storage chamber at the top of the pressure regulating piston is reduced, and then the sealing bellows or the supporting bellows at the sealing part of the main piston is contracted, so that the sealing positive pressure between the main piston and the cylinder wall is reduced, the oil in the upper part of the main piston can wet the contact surface between the main piston and the cylinder wall, and then the frictional resistance of the cylinder wall to the main piston during the lifting of the main piston is reduced, which is beneficial to the rapid upward movement of the main piston, and the oil in the oil tank can be timely lubricated and the sealing friction heat can be removed through the gap between the main piston and the cylinder wall.

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