High-energy-density hydraulic energy accumulator integrated with heat dissipation function

Abstract

The high-energy-density hydraulic energy accumulator integrated with the heat dissipation function comprises a cylinder body and a piston installed in the cylinder body in a sliding fit mode, and the piston divides an inner cavity of the cylinder body into an oil cavity and an air cavity; the spiral transmission shaft is coaxially arranged with the piston, penetrates through the piston and the cylinder body, is in spiral transmission fit connection with the piston, is in sealed connection with the piston, is in rolling fit connection with the cylinder body, and is in sealed connection with the cylinder body; an oil path channel and a gas path channel which are respectively communicated with the oil cavity and the gas cavity are arranged in the spiral transmission shaft; the air channel end of the spiral transmission shaft is in transmission connection with the heat dissipation mechanism. Self heat dissipation without additional energy driving can be achieved, high energy density can be achieved on the premise that the size is small, and the self-heat-dissipation hydraulic cylinder is particularly suitable for application scenes of mobile hydraulic equipment with limited installation space.

Description

Technical Field

[0001] The invention relates to a hydraulic accumulator, in particular to a high energy density hydraulic accumulator with integrated heat dissipation function, belonging to the technical field of hydraulic accumulators. Background Art

[0002] Hydraulic accumulator is an energy storage device in hydraulic system. It converts the energy in the system into compression energy or potential energy and stores it at the right time. When the system needs it, it converts the compression energy or potential energy into hydraulic or air pressure energy and releases it to replenish the system. Therefore, hydraulic accumulator is an important device for hydraulic system to realize functions such as energy storage, pressure pulsation absorption and auxiliary power source.

[0003] Hydraulic oil is an incompressible liquid, so it is impossible to store pressure energy using hydraulic oil. It is necessary to rely on other media to convert the stored pressure energy. The method of using compressible gas medium to convert and store energy is currently a common method of hydraulic accumulators. However, the traditional hydraulic accumulators that use gas medium to convert and store energy have always had the problem of low energy density. Taking the common piston hydraulic accumulator as an example, it relies on the piston to separate the oil and gas, and stores energy through gas compression. However, within a certain pressure change range, the gas compression volume is limited, resulting in a small effective filling volume. This problem is particularly prominent in application scenarios such as engineering machinery and mobile hydraulic equipment that require energy storage capacity. Usually, the only way to solve the problem of small effective filling volume is to increase the volume of the hydraulic accumulator. For example, if the energy storage oil volume is required to be 30L and the pressure change range is 15-20MPa, it can be calculated that the required hydraulic accumulator volume is 190L and the outer volume is 250L. A large volume of hydraulic accumulator will not only occupy a lot of valuable space, increase equipment weight and cost, but also limit the flexibility and performance improvement of the equipment.

[0004] In addition, the hydraulic accumulator will generate a lot of heat when working for a long time or under high load conditions. If this heat cannot be dissipated in time, the temperature of the hydraulic accumulator will rise, thus affecting its performance and service life. The heat dissipation of traditional hydraulic accumulators usually adopts natural cooling when the ambient temperature is low or the heat dissipation demand is small. However, for occasions with high ambient temperature or large heat dissipation demand, forced air cooling or forced liquid cooling that requires additional energy is usually adopted. The cooling method that requires additional energy is not economical on the one hand, and on the other hand, it requires additional installation space for cooling mechanisms such as fans and radiators. Summary of the invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides a high-energy density hydraulic accumulator with integrated heat dissipation function. Compared with traditional hydraulic accumulators that use gas media to convert and store energy, it can achieve higher energy density while being smaller in size, and realize self-heating without the need for additional energy drive. It is particularly suitable for mobile hydraulic equipment application scenarios with limited installation space.

[0006] To achieve the above purpose, the high energy density hydraulic accumulator with integrated heat dissipation function is a piston structure, including a cylinder body and a piston slidably mounted inside the cylinder body, and the piston divides the inner cavity of the cylinder body into an oil cavity and an air cavity;

[0007] The high energy density hydraulic accumulator with integrated heat dissipation function also includes a spiral transmission shaft coaxially arranged with the piston, the spiral transmission shaft axially positioned and installed runs through the piston and the cylinder body, the spiral transmission shaft is connected with the piston in a spiral transmission matching manner, and the spiral transmission shaft and the piston are sealed, the spiral transmission shaft and the cylinder body are rollingly matched, and the spiral transmission shaft and the cylinder body are sealed; the shaft end of the spiral transmission shaft located on one side of the oil chamber of the cylinder body is provided with an oil passage penetrating into the spiral transmission shaft in the axial direction of the spiral transmission shaft, and the oil passage is provided through a spiral transmission shaft radially arranged The hydraulic oil port I is communicated with the oil chamber of the cylinder body, the oil passage end of the spiral transmission shaft is sealed and connected with the oil passage joint including the hydraulic oil port II, and the oil passage joint is fixedly installed and connected with the cylinder body; an air passage penetrating into the spiral transmission shaft along the axial direction of the spiral transmission shaft is provided on the shaft end of the spiral transmission shaft located on one side of the cylinder body air chamber, and the air passage is communicated with the air chamber of the cylinder body through the inflation port I which is arranged through the spiral transmission shaft in the radial direction, and the air passage end of the spiral transmission shaft is sealed and connected with the air passage joint including the inflation port II; the air passage end of the spiral transmission shaft is transmission-connected with the heat dissipation mechanism.

[0008] As an embodiment of the heat dissipation mechanism of the present invention, the heat dissipation mechanism is a heat dissipation fan structure, the heat dissipation mechanism includes a fan blade structure installed and connected to the air path end of the spiral transmission shaft, the fan blade structure includes a fan blade seat coaxially installed and connected to the air path end of the spiral transmission shaft and blades centrally symmetrically fixed on the fan blade seat.

[0009] As another embodiment of the heat dissipation mechanism of the present invention, the heat dissipation mechanism is a closed-cycle liquid-cooled heat dissipation structure, the heat dissipation mechanism includes a heat dissipation pump, a circulating heat dissipation pipe and a circulating solution tank, the power input shaft of the heat dissipation pump is transmission-connected to the air path end of the spiral transmission shaft through a one-way clutch, the circulating heat dissipation pipe is coiled and close-fittingly arranged outside the cylinder body, one end of the circulating heat dissipation pipe coil is connected to the pump outlet end of the heat dissipation pump, and the other end is connected to the circulating solution tank, the pump inlet end of the heat dissipation pump is connected to the circulating solution tank, and the circulating solution tank is provided with heat dissipation liquid.

[0010] As a further improvement of the present invention, an adsorption material assembly is provided in the air cavity of the cylinder body, and the adsorption material assembly includes an adsorption material with a large specific surface area and a microporous film encapsulated outside the adsorption material, and the microporous film allows gas to flow freely.

[0011] As a further improvement of the present invention, a countersunk hole structure is provided on the end surface of the piston facing the air cavity, and the adsorption material is arranged in the countersunk hole structure of the piston through microporous film packaging.

[0012] As a further improvement of the present invention, a bearing is provided at the rolling matching position between the spiral transmission shaft and the cylinder body.

[0013] As a further improvement of the present invention, a through hole penetrating the spiral transmission shaft is provided at the axial center position of the spiral transmission shaft, a sealing member is fixed in the through hole, and the sealing member is located in the middle position of the axial length of the through hole, and the sealing member divides the through hole into an oil channel and a gas channel.

[0014] As a further improvement of the present invention, the piston is connected to the cylinder body by a sliding fit installation via a positioning and guiding mechanism arranged along the axial direction of the cylinder body, and the positioning and guiding mechanism limits the circumferential rotation of the piston.

[0015] As a further improvement of the present invention, the charging port II is connected to the gas medium pressure cylinder through a pipeline and a control valve group.

[0016] As an embodiment of the present invention, the spiral transmission shaft and the piston are sealed by a rotating sealing ring and a lip sealing ring; the spiral transmission shaft and the cylinder body are sealed by a pan-plug seal and an O-ring, and the pan-plug seal is located between the two O-rings.

[0017] Compared with the prior art, when the high-energy-density hydraulic accumulator with integrated heat dissipation function is installed on the external hydraulic system circuit through the oil circuit joint for use, the gas medium is filled into the air cavity of the cylinder body through the charging port II to the initial pressure. When the pressure of the external hydraulic system circuit increases (energy storage state of the hydraulic accumulator), the external hydraulic oil enters the oil cavity of the cylinder body through the oil circuit channel and pushes the piston to compress the gas medium in the air cavity. The pressure of the gas medium increases and accumulates pressure energy, thereby realizing the conversion of hydraulic energy into gas internal energy. While the piston moves along the axial direction of the cylinder body, the piston drives the spiral transmission shaft to rotate forward through the spiral transmission, thereby realizing the conversion of hydraulic energy into the rotational kinetic energy of the spiral transmission shaft. During the rotation of the spiral transmission shaft, the heat dissipation mechanism is driven to operate to realize the self-heating of the hydraulic accumulator. By storing the hydraulic energy as the gas internal energy and the rotational kinetic energy of the spiral transmission shaft respectively, the gas medium in the air cavity can be reduced. The internal energy of the gas is increased, and thus the hydraulic accumulator can store more energy in the same volume; when the pressure of the external hydraulic system circuit is reduced (the hydraulic accumulator is in the energy release state), the gas medium in the air cavity of the cylinder body releases pressure energy and pushes the piston to squeeze the hydraulic oil in the oil cavity and discharge it through the oil channel. In the process of releasing the pressure energy of the gas medium, the pressure drops, and the internal energy of the gas is converted into hydraulic energy. While the piston moves along the axial direction of the cylinder body, the piston drives the spiral transmission shaft to rotate in the opposite direction through the spiral transmission, and the internal energy of the gas is converted into the rotational kinetic energy of the spiral transmission shaft. The process of releasing the pressure energy of the gas medium is itself a cooling process. Therefore, the heat dissipation of the hydraulic accumulator can be stopped by driving the heat dissipation mechanism in the reverse rotation of the spiral transmission shaft, and the heat dissipation of the hydraulic accumulator can be further achieved by driving the heat dissipation mechanism in the reverse rotation of the spiral transmission shaft. The high-energy-density hydraulic accumulator with integrated heat dissipation function can convert hydraulic energy into gas internal energy and rotational kinetic energy of the spiral transmission shaft. On the one hand, it can reduce the gas internal energy increase and increase the density of stored energy. On the other hand, it can realize self-heating without the need for additional energy by driving the heat dissipation mechanism through the rotation output kinetic energy of the spiral transmission shaft. By reasonably setting parameters such as the pitch, outer diameter, inner diameter of the oil channel, inner diameter of the gas channel and the like of the spiral transmission shaft, it is possible to adjust the storage ratio of the distributed kinetic energy and the gas internal energy. Its heat dissipation function can not only realize self-heating, but also realize auxiliary heat dissipation of the external hydraulic system. It is particularly suitable for mobile hydraulic equipment application scenarios with limited installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] In the figure: 1. Hydraulic oil port I; 2. Bearing; 3. Hydraulic oil port II; 4. Cylinder body; 5. Piston; 6. Sealed transmission area; 7. Sealing part; 8. Inflating port I; 9. Fan blade structure; 10. Inflating port II; 11. Screw drive shaft. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the high energy density hydraulic accumulator with integrated heat dissipation function is a piston structure, including a cylinder body 4 and a piston 5 slidably mounted inside the cylinder body 4, and the piston 5 divides the inner cavity of the cylinder body 4 into an oil cavity and an air cavity.

[0022] The high energy density hydraulic accumulator with integrated heat dissipation function also includes a spiral transmission shaft 11 coaxially arranged with the piston 5. The spiral transmission shaft 11 installed in an axial positioning manner penetrates the piston 5 and the cylinder body 4. The spiral transmission shaft 11 is connected with the piston 5 in a spiral transmission manner, and the spiral transmission shaft 11 and the piston 5 are sealed by a rotating sealing ring and a lip sealing ring to form a sealed transmission area 6. The rotating sealing ring is made of a material with a low friction coefficient, such as polytetrafluoroethylene, which is in close contact with the spiral transmission shaft 11. When the spiral transmission shaft 11 rotates, it can effectively reduce friction resistance and ensure smooth rotation. The lip seal has good sealing performance, and its outer side is tightly fitted with the piston 5 to prevent oil from leaking into the air chamber; the spiral transmission shaft 11 is connected with the cylinder body 4 in a rolling fit, and the spiral transmission shaft 11 and the cylinder body 4 are sealed by a pan seal and an O-ring. The sealing lip of the pan seal is tightly fitted with the spiral transmission shaft 11, and its special sealing structure can adapt to the rotation and a certain degree of axial movement of the spiral transmission shaft 11. The two O-rings are respectively located on both sides of the pan seal, which can further enhance the sealing effect and prevent oil and gas leakage; the spiral transmission shaft 11 is located in the oil chamber of the cylinder body 4. An oil passage is provided on the shaft end on the side thereof, which penetrates into the screw transmission shaft 11 in the axial direction of the screw transmission shaft 11, and the oil passage is communicated with the oil chamber of the cylinder body 4 through a hydraulic oil port Ⅰ1 which is arranged through the screw transmission shaft 11 in the radial direction, the oil passage end of the screw transmission shaft 11 is sealed and connected with an oil passage joint including a hydraulic oil port Ⅱ3 through a rotating sealing ring, and the oil passage joint is fixedly installed and connected with the cylinder body 4, and the oil chamber of the cylinder body 4 is communicated with the external hydraulic system circuit through the oil passage and the oil passage joint; an oil passage is provided on the shaft end of the screw transmission shaft 11 located on the air chamber side of the cylinder body 4 along the axial direction of the screw transmission shaft 11 The air path passage of the spiral transmission shaft 11 is penetrated, and the air path passage is connected with the air cavity of the cylinder body 4 through the inflation port Ⅰ8 which is arranged along the radial direction of the spiral transmission shaft 11. The air path passage end of the spiral transmission shaft 11 is sealed and connected with the air path joint including the inflation port Ⅱ10 through a rotating sealing ring. The air cavity of the cylinder body 4 is filled with and contains the gas medium through the air path passage and the air path joint. The air path joint can be directly connected to the gas medium pressure cylinder. The gas medium can be nitrogen, carbon dioxide, inert gas or other gas with a relatively large compression ratio. The air path passage end of the spiral transmission shaft 11 is transmission-connected with the heat dissipation mechanism.

[0023] When the high-energy-density hydraulic accumulator with integrated heat dissipation function is installed in an external hydraulic system circuit through an oil circuit joint for use, a gas medium is filled into the air cavity of the cylinder body 4 to an initial pressure through the filling port II 10. When the pressure of the external hydraulic system circuit increases (energy storage state of the hydraulic accumulator), the external hydraulic oil enters the oil cavity of the cylinder body 4 through the oil circuit channel, and pushes the piston 5 to compress the gas medium in the air cavity. The pressure of the gas medium increases and accumulates pressure energy, thereby realizing the conversion of hydraulic energy into gas internal energy. While the piston 5 moves along the axial direction of the cylinder body 4, the piston 5 drives the spiral transmission shaft 11 to rotate forward through the spiral transmission, thereby realizing the conversion of hydraulic energy into the rotational kinetic energy of the spiral transmission shaft 11. During the rotation of the spiral transmission shaft 11, the heat dissipation mechanism is driven to operate to realize the self-heating of the hydraulic accumulator. By storing the hydraulic energy as the gas internal energy and the rotational kinetic energy of the spiral transmission shaft 11 respectively, the gas medium in the air cavity can be reduced. The increase in internal energy of the body can realize the hydraulic accumulator to store more energy in the same volume; when the pressure of the external hydraulic system circuit is reduced (the hydraulic accumulator is in the energy release state), the gas medium in the air cavity of the cylinder body 4 releases pressure energy and pushes the piston 5 to squeeze the hydraulic oil in the oil cavity and discharge it through the oil passage. In the process of releasing the pressure energy of the gas medium, the pressure drops, and the internal energy of the gas is converted into hydraulic energy. While the piston 5 moves along the axial direction of the cylinder body 4, the piston 5 drives the spiral transmission shaft 11 to rotate in the opposite direction through the spiral transmission, and the internal energy of the gas is converted into the rotational kinetic energy of the spiral transmission shaft 11. The process of releasing the pressure energy of the gas medium is itself a cooling process. Therefore, the heat dissipation of the hydraulic accumulator can be stopped by driving the heat dissipation mechanism in the reverse rotation of the spiral transmission shaft 11, and the heat dissipation of the hydraulic accumulator can be further realized by driving the heat dissipation mechanism in the reverse rotation of the spiral transmission shaft 11.

[0024] The high energy density hydraulic accumulator with integrated heat dissipation function can adjust the storage ratio of the distribution kinetic energy and the gas internal energy by reasonably setting the pitch, outer diameter, inner diameter of the oil channel, inner diameter of the gas channel and other parameters of the spiral transmission shaft 11. When the pitch of the spiral transmission shaft 11 is increased, the number of revolutions of the spiral transmission shaft 11 when the piston 5 moves the same straight line distance is reduced (i.e., the speed is reduced), and the heat dissipation effect of the heat dissipation mechanism is weakened to a certain extent, but more hydraulic energy can be converted into gas internal energy storage, and the gas internal energy storage ratio is relatively increased; conversely, reducing the pitch of the spiral transmission shaft 11 will increase the speed of the spiral transmission shaft 11, enhance the heat dissipation effect of the heat dissipation mechanism, and at the same time reduce the gas internal energy storage ratio and increase the output ratio of the rotational kinetic energy of the spiral transmission shaft 11. Increasing (or reducing) the outer diameter of the screw transmission shaft 11 and reducing (or increasing) the inner diameter of the oil channel and the inner diameter of the gas channel will increase (or reduce) the torque overcome by the screw transmission. Under the same hydraulic oil push, the movement speed of the piston 5 will slow down (or speed up), and the rotation speed of the screw transmission shaft 11 will also change accordingly, thereby affecting the distribution ratio of kinetic energy and gas internal energy, and at the same time affecting the heat dissipation capacity of the heat dissipation mechanism. In addition, the speed of hydraulic oil entering the screw transmission shaft 11 can be controlled by setting a flow control mechanism such as a throttle valve on the hydraulic oil circuit, thereby indirectly adjusting the movement speed of the piston 5 and the rotation speed of the screw transmission shaft 11, and realizing precise control of heat dissipation and energy distribution.

[0025] As an implementation method of the heat dissipation mechanism of the present invention, Figure 1 As shown, the heat dissipation mechanism is a heat dissipation fan structure, and the heat dissipation mechanism includes a fan blade structure 9 installed and connected to the gas path channel end of the spiral transmission shaft 11, and the fan blade structure 9 includes a fan blade seat coaxially installed and connected to the gas path channel end of the spiral transmission shaft 11 and blades fixedly arranged on the fan blade seat symmetrically. During the process of the piston 5 driving the spiral transmission shaft 11 to rotate through the spiral transmission, whether the spiral transmission shaft 11 rotates forward or reverse, it can synchronously and directly drive the fan blade structure 9 to rotate to achieve self-heating of the hydraulic accumulator, and the rotation of the fan blade structure 9 can also achieve auxiliary heat dissipation of the external hydraulic system.

[0026] As another embodiment of the heat dissipation mechanism of the present invention, the heat dissipation mechanism is a closed-cycle liquid cooling heat dissipation structure, the heat dissipation mechanism includes a heat dissipation pump, a circulating heat dissipation pipe and a circulating solution tank, the power input shaft of the heat dissipation pump is connected to the gas path end of the spiral transmission shaft 11 through a one-way clutch, the circulating heat dissipation pipe is coiled and arranged close to the outside of the cylinder body 4, one end of the circulating heat dissipation pipe coil is connected to the pump outlet end of the heat dissipation pump, and the other end is connected to the circulating solution tank, the pump inlet end of the heat dissipation pump is connected to the circulating solution tank, and the circulating solution tank is provided with a heat dissipation liquid for heat exchange, and the heat dissipation liquid can be water, propylene glycol aqueous solution, polyol aqueous solution and other liquids with good heat transfer effect. When the piston 5 drives the spiral transmission shaft 11 to rotate forward (hydraulic accumulator energy storage state) through the spiral transmission, the spiral transmission shaft 11 can drive the heat dissipation pump to drive the heat dissipation liquid to perform a closed cycle and realize the heat dissipation of the hydraulic accumulator, and when the piston 5 drives the spiral transmission shaft 11 to rotate reversely (hydraulic accumulator energy release state) through the spiral transmission, the spiral transmission shaft 11 cannot drive the heat dissipation pump to operate and does not dissipate heat to the hydraulic accumulator.

[0027] In order to further achieve higher energy density and improve the conversion and accumulation stability, as a further improvement scheme of the present invention, an adsorption material component is provided in the air cavity of the cylinder 4, and the adsorption material component includes an adsorption material with a large specific surface area and a microporous film encapsulated outside the adsorption material. The adsorption material with stable gas adsorption capacity under normal temperature and a certain pressure range can be made of bamboo activated carbon, zeolite molecular sieve, metal organic framework material and the like. The microporous film can be made of high molecular polymer materials such as polytetrafluoroethylene (PTFE), polyethylene (PE), and polyurethane (PU). The microporous film allows gas to flow freely while blocking water, dust and other pollutants. When the hydraulic accumulator is in energy storage state, part of the gas medium can be adsorbed by the adsorption material through the microporous film to reduce the number of gas moles, so the internal energy increase and pressure rise of the gas medium are reduced, so that more hydraulic oil can be stored in the oil chamber of the cylinder body 4 under the same pressure change; when the hydraulic accumulator is in energy release state, the pressure of the gas medium decreases during the process of releasing the pressure energy, and the gas medium adsorbed by the adsorption material is desorbed and released to maintain the gas pressure in the air chamber of the cylinder body 4, so as to ensure the stable output of the hydraulic oil in the oil chamber of the cylinder body 4 and improve the conversion and accumulation stability.

[0028] In order to further reduce the volume of the accumulator and improve the utilization rate of the energy storage space, as a further improvement scheme of the present invention, a countersunk hole structure is provided on the end face of the piston 5 facing the air cavity, and the adsorption material is arranged in the countersunk hole structure of the piston 5 through microporous film packaging.

[0029] In order to enable the screw transmission shaft 11 to roll more smoothly relative to the cylinder body 4 , as a further improvement of the present invention, a bearing 2 is provided at the rolling matching position between the screw transmission shaft 11 and the cylinder body 4 .

[0030] To facilitate the integrated processing and manufacturing of the oil passage and the gas passage, as a further improvement scheme of the present invention, a through hole that penetrates the spiral transmission shaft 11 is provided at the axial position of the spiral transmission shaft 11, a blocking member 7 is fixedly provided in the through hole, and the blocking member 7 is located in the middle position of the axial length of the through hole, and the blocking member 7 divides the through hole into an oil passage and a gas passage.

[0031] In order to realize that the piston 5 can stably drive the spiral transmission shaft 11 to rotate through spiral transmission, as a further improvement scheme of the present invention, the piston 5 is slidably mounted and connected with the cylinder body 4 through a positioning and guiding mechanism arranged along the axial direction of the cylinder body 4. The positioning and guiding mechanism can limit the circumferential rotation of the piston 5. The positioning and guiding mechanism can be a guide groove structure arranged on the cylindrical surface of the piston 5 (or the inner cavity surface of the cylinder body 4) and a guide key structure arranged on the inner cavity surface of the cylinder body 4 (or the cylindrical surface of the piston 5), or it can be a guide rod structure arranged in the inner cavity of the cylinder body 4 and a guide hole structure arranged on the end face of the piston 5 and other linear guide matching structures.

Claims

1. A high energy density hydraulic accumulator with integrated heat dissipation function, which is a piston-type structure, comprising a cylinder (4) and a piston (5) slidably mounted inside the cylinder (4), wherein the piston (5) divides the inner cavity of the cylinder (4) into an oil cavity and an air cavity; characterized in that: The high energy density hydraulic accumulator with integrated heat dissipation function also includes a spiral transmission shaft (11) coaxially arranged with the piston (5), the spiral transmission shaft (11) axially positioned and installed penetrates the piston (5) and the cylinder body (4), the spiral transmission shaft (11) and the piston (5) are connected in a spiral transmission matching manner, and the spiral transmission shaft (11) and the piston (5) are sealed, the spiral transmission shaft (11) and the cylinder body (4) are connected in a rolling matching manner, and the spiral transmission shaft (11) and the cylinder body (4) are sealed; an oil passage penetrating into the spiral transmission shaft (11) along the axial direction of the spiral transmission shaft (11) is provided on the shaft end of the spiral transmission shaft (11) located on one side of the oil chamber of the cylinder body (4), and the oil passage is connected along the radial direction of the spiral transmission shaft (11). A hydraulic oil port I (1) is arranged through the screw drive shaft (11) and communicates with the oil chamber of the cylinder body (4); the oil passage end of the screw drive shaft (11) is sealedly connected to an oil passage joint including a hydraulic oil port II (3); and the oil passage joint is fixedly connected to the cylinder body (4); an air passage is provided on the shaft end of the screw drive shaft (11) located on one side of the air chamber of the cylinder body (4) and penetrates into the screw drive shaft (11) in the axial direction of the screw drive shaft (11); the air passage is communicated with the air chamber of the cylinder body (4) through an air charging port I (8) arranged through the screw drive shaft (11) in the radial direction; the air passage end of the screw drive shaft (11) is sealedly connected to an air passage joint including an air charging port II (10); and the air passage end of the screw drive shaft (11) is drivingly connected to a heat dissipation mechanism.

2. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, characterized in that: The heat dissipation mechanism is a heat dissipation fan structure, which comprises a fan blade structure (9) mounted and connected to the air path channel end of the spiral transmission shaft (11), and the fan blade structure (9) comprises a fan blade seat coaxially mounted and connected to the air path channel end of the spiral transmission shaft (11) and blades centrally and symmetrically fixedly arranged on the fan blade seat.

3. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, characterized in that: The heat dissipation mechanism is a closed-loop liquid cooling heat dissipation structure, comprising a heat dissipation pump, a circulating heat dissipation pipe and a circulating solution tank. The power input shaft of the heat dissipation pump is drivingly connected to the gas path end of the spiral transmission shaft (11) through a one-way clutch. The circulating heat dissipation pipe is coiled and arranged close to the outside of the cylinder body (4). One end of the circulating heat dissipation pipe coil is connected to the pump outlet end of the heat dissipation pump and the other end is connected to the circulating solution tank. The pump inlet end of the heat dissipation pump is connected to the circulating solution tank. Heat dissipation liquid is arranged in the circulating solution tank.

4. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, 2 or 3, characterized in that: An adsorption material component is arranged in the air cavity of the cylinder body (4), and the adsorption material component comprises an adsorption material with a large specific surface area and a microporous film encapsulated outside the adsorption material, and the microporous film allows gas to flow freely.

5. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 4, characterized in that: A countersunk hole structure is provided on the end surface of the piston (5) facing the air cavity, and the adsorption material is arranged in the countersunk hole structure of the piston (5) through microporous film packaging.

6. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, 2 or 3, characterized in that: A bearing (2) is provided at the rolling matching position between the spiral transmission shaft (11) and the cylinder body (4).

7. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, 2 or 3, characterized in that: A through hole penetrating the spiral transmission shaft (11) is provided at the axial center of the spiral transmission shaft (11), a blocking member (7) is fixedly provided in the through hole, and the blocking member (7) is located at the middle position of the axial length of the through hole, and the blocking member (7) divides the through hole into an oil passage and a gas passage.

8. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, 2 or 3, characterized in that: The piston (5) is connected to the cylinder body (4) by sliding fit via a positioning guide mechanism arranged along the axial direction of the cylinder body (4), and the positioning guide mechanism limits the circumferential rotation of the piston (5).

9. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, 2 or 3, characterized in that: The charging port II (10) is connected to the gas medium pressure cylinder through a pipeline and a control valve group.

10. The high energy density hydraulic accumulator with integrated heat dissipation function according to claim 1, 2 or 3, characterized in that: The spiral transmission shaft (11) and the piston (5) are sealed by a rotary seal ring and a lip seal ring; the spiral transmission shaft (11) and the cylinder body (4) are sealed by a pan seal and an O-ring, and the pan seal is located between the two O-rings.

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