Pressure fluid storage device for thermal storage and method of use

Abstract

The pressure fluid storage device for heat mass energy storage comprises storage wells, the storage wells comprise the first storage well and the second storage well which are communicated with each other, a fluid connector is formed in the side wall of the second storage well, and in the plane perpendicular to the center line of the storage wells, the projection of the first storage well covers the projection of the second storage well; the first gravity column is arranged in the first storage well; the second gravity column is arranged in the second storage well; the sealing film is arranged on the second storage well and located between the second gravity column and the second storage well, a sealed space is formed between the sealing film and the second storage well, and the fluid connector is in fluid communication with the sealed space so as to fill or discharge pressure fluid into the sealed space. When the pressure fluid is discharged, the second gravity column is suitable for being switched from the separation position to the embedded position relative to the first gravity column, and when the pressure fluid is discharged, the second gravity column is suitable for being switched from the embedded position to the separation position relative to the first gravity column. The storage device can realize engineering-magnitude fluid flexible sealing and constant-pressure storage.

Description

Technical Field

[0001] The present invention relates to the field of pressure vessels, and provides a pressure fluid storage device for thermal mass energy storage and a usage method thereof. Background Art

[0002] Pressure fluids are widely used in our daily lives, such as natural gas, medical oxygen, and industrial compressed air. Their efficient utilization is crucial for energy and industrial production. Thermal mass energy storage is an energy storage technology based on a thermal system, which uses the expansion of high-temperature pressure fluids to generate electricity for storing energy. Therefore, the efficient storage of pressure fluids is extremely important. However, existing pressure storage devices, such as pressure tanks and gas storage chambers, although widely used, have significant problems during the filling and discharging processes of pressure fluids. These devices rely on pumps or compressors to maintain the system pressure. Once the filling or discharging operation is carried out, the internal pressure will change due to the flow of the medium and the design of the system, making it difficult to maintain a constant pressure and causing inconvenience to the operation.

[0003] Pressure fluctuations are not only an inevitable challenge during the storage process but also the main source of energy loss of pressure fluids. Part of the pressure energy is released during the filling and discharging processes, and this part of the energy loss will increase the operating cost and reduce the system efficiency. Especially in the context of energy transformation, it has become particularly important to develop a technology that can efficiently store pressure fluids and operate stably under fluctuating pressures. Summary of the Invention

[0004] An embodiment of the present invention provides a pressure fluid storage device for thermal mass energy storage, which is used to achieve the constant-pressure storage and charging / discharging of pressure fluids and reduce the energy loss during the charging / discharging process of pressure fluids.

[0005] An embodiment of the present invention also provides a usage method of a pressure fluid for thermal mass energy storage.

[0006] An embodiment of the first aspect of the present invention provides a pressure fluid storage device for thermal mass energy storage, including: A storage well, the storage well includes a first storage well and a second storage well that are interconnected. A fluid interface is provided on the side wall of the second storage well. In a plane perpendicular to the center line of the storage well, the projection of the first storage well covers the projection of the second storage well; A first gravity column, arranged in the first storage well; A second gravity column, arranged in the second storage well; A sealing film is disposed in the second storage well and located between the second gravity column and the second storage well. A sealed space is formed between the sealing film and the second storage well. The fluid interface is in fluid communication with the sealed space to fill or discharge pressurized fluid into the sealed space. When the pressurized fluid is filled, the second gravity column is adapted to switch from a separated position to a fitted position relative to the first gravity column. When the pressurized fluid is discharged, the second gravity column is adapted to switch from the fitted position to the separated position relative to the first gravity column.

[0007] According to an embodiment of the present invention, a fixed end is provided on the side wall of the second storage well, and the end of the sealing film is fixedly connected to the second storage well through the fixed end.

[0008] According to an embodiment of the present invention, the sealing film includes: A sealing layer, which is connected to the fixed end; A strength layer, which is disposed on the side of the sealing layer close to the second gravity column, and the strength layer is connected to the fixed end.

[0009] According to an embodiment of the present invention, the strength layer includes at least two strips arranged circumferentially along the center line of the storage well, and the at least two strips enclose to form a cylindrical structure with an open top.

[0010] According to an embodiment of the present invention, along the circumferential direction of the center line of the storage well, the edges of adjacent two strips are at least partially laminated to form a laminated area.

[0011] According to an embodiment of the present invention, a positioning area corresponding to the second gravity column is formed at the bottom of the strength layer.

[0012] According to an embodiment of the present invention, the fixed end includes: A first fixing part, which is disposed on the side wall of the second storage well, and the sealing layer is connected to the first fixing part; A second fixing part, which is disposed on the side wall of the second storage well, and the strength layer is connected to the second fixing part.

[0013] According to an embodiment of the present invention, a groove is formed on the side of the first gravity column facing the second gravity column, and a positioning mechanism is disposed in the groove. The second gravity column is adapted to be positioned with the first gravity column through the positioning mechanism.

[0014] An embodiment of the second aspect of the present invention provides a method for using a pressure fluid storage device for thermal mass energy storage as described above, including: A debugging step, and the debugging step includes: Laying the sealing film in the second storage well; Lift the second gravity column to the second storage well and place it in the sealing film; Lift the first gravity column to the first storage well; Introduce pressure fluid at a first pressure into the sealed space to switch the second gravity column from the separation position to the fitting position; Discharge the pressure fluid at the first pressure in the sealed space to switch the second gravity column from the fitting position to the separation position and cycle in this way to make the laminated area in the strength layer in a steady state; Operation steps, the operation steps include: When the second gravity column is in the separation position, introduce pressure fluid at a first pressure into the sealed space to switch the second gravity column from the separation position to the fitting position; Introduce pressure fluid at a second pressure into the sealed space to separate the first gravity column from the first storage well and make the first gravity column and the second gravity column rise as a whole; When the second gravity column is in the fitting position, introduce pressure fluid at a second pressure into the sealed space to make the first gravity column and the second gravity column rise as a whole.

[0015] According to an embodiment of the present invention, the sealing film includes a sealing layer and a strength layer, and a laminated area and a positioning area are formed in the strength layer; The debugging steps further include: Align the positioning area with the center of the second storage well; The step of lifting the second gravity column to the second storage well and placing it in the sealing film includes: Align the second gravity column with the positioning area; The usage method further includes: Repeatedly charge and discharge pressure fluid into the sealed space to make the laminated area in a steady state; The operation steps further include: When the first gravity column and the second gravity column rise as a whole to the upper limit position, close the fluid interface; After the operation steps, there is also a discharge step, and the discharge step includes: Discharge the pressure fluid at the second pressure, open the fluid interface to discharge the pressure fluid at the second pressure, and when the bottom of the first gravity column contacts the bottom of the first storage well, close the fluid interface; Or, The pressure fluid of the second pressure is discharged together with the pressure fluid of the first pressure. The fluid interface is opened to discharge the pressure fluid of the second pressure. When the bottom of the first gravity column contacts the bottom of the first storage well, the discharge of the pressure fluid of the second pressure is completed. During the process of switching the second gravity column from the fitting position to the separation position, the pressure fluid of the first pressure is discharged. After the discharge of the pressure fluid of the first pressure, the fluid interface is closed.

[0016] The pressure fluid storage device for thermal mass energy storage according to the first aspect embodiment of the present invention, by designing the storage wells as the first storage well and the second storage well that are interconnected and the first storage well covers the second storage well in projection, cleverly utilizes the spatial layout to achieve an efficient energy storage structure design. This unique structure enables the device to reasonably arrange components such as gravity columns within a limited space, providing a stable infrastructure for thermal mass energy storage. Compared with traditional energy storage devices, there is a significant improvement in space utilization efficiency. The first gravity column arranged in the first storage well and the second gravity column arranged in the second storage well, in cooperation with the design of the sealing film and the fluid interface, form a flexible gravity column switching mechanism. When the pressure fluid is filled into the sealed space through the fluid interface, the second gravity column can be switched from the separation position to the fitting position relative to the first gravity column, realizing the change of the energy storage state; when discharging the pressure fluid, the second gravity column can switch back from the fitting position to the separation position to complete the release of energy. This flexibly switchable mechanism enables the device to dynamically adjust according to the actual energy storage and release requirements, improving the response speed and working efficiency of the energy storage system. More importantly, through the setting of the position switching of the first gravity column and the second gravity column, the pressure fluid storage device can achieve low-pressure start-up operation, avoiding the problem of unable to start smoothly. The sealing film is arranged in the second storage well and is located between the second gravity column and the second storage well, forming a sealed space with the second storage well, ensuring the sealing performance during the filling and discharging processes of the pressure fluid. It ensures that the pressure fluid can effectively exert a force on the second gravity column, thereby realizing the accurate switching of the gravity column and guaranteeing the normal operation of the entire energy storage device. The pressure fluid storage device can realize the switching of the position of the second gravity column by filling and discharging the pressure fluid, so as to adapt to different thermal mass energy storage working conditions. Whether in the case of requiring a large amount of energy storage or in the scenario of quickly releasing energy to meet sudden demands, the pressure fluid storage device can optimize the energy storage and energy release processes by adjusting the position of the gravity column, providing broader possibilities for the practical application of thermal mass energy storage technology. In terms of structural design, by reasonably utilizing space and simple component combinations, complex mechanical structures and expensive sealing materials are avoided, reducing the manufacturing cost of the device.

[0017] According to the method of using a pressure fluid storage device for thermo-mass energy storage provided by the second aspect embodiment of the present invention, the cycling operation in the commissioning step enables the laminated area in the strength layer to reach a steady state, effectively eliminating possible unstable factors inside the device, such as assembly gaps, stress concentrations, etc. This provides a solid guarantee for the stability of the device during long-term operation and reduces the risk of failures caused by unstable internal structures. By introducing pressure fluids of the first pressure and the second pressure respectively, it is possible to precisely control the switching of the second gravity column between the separation position and the fitting position, and to achieve the overall upward movement of the first gravity column and the second gravity column. This precise position control ability enables the device to flexibly adjust the position of the gravity column according to the different operating conditions of the thermo-mass energy storage system, thereby efficiently completing the energy storage and release processes. During the operation step, whether the second gravity column is in the separation position or the fitting position, the overall upward movement of the gravity column can be achieved by introducing pressure fluids of the corresponding pressure, demonstrating the good operating condition adaptability of the device. It is possible to quickly respond and adjust the device state according to the energy changes of the thermo-mass energy storage system at different stages, improving the working efficiency and reliability of the entire thermo-mass energy storage system. The steps of the entire method of use are clear and straightforward. By controlling the introduction and discharge of pressure fluids, the commissioning and operation of the device can be achieved. Compared with some complex mechanical operation methods, this method based on pressure fluid control is more convenient, and at the same time, it can quickly change the position of the gravity column, improving the operation efficiency of the device and being conducive to large-scale application in actual thermo-mass energy storage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic sectional view of the pressure fluid storage device for thermo-mass energy storage provided by the present invention without pressure fluid introduced.

[0020] Figure 2 It is a schematic forming step diagram of the sealing film provided by the present invention.

[0021] Figure 3 It is a schematic enlarged view of the fixed end provided by the present invention.

[0022] Figure 4 It is a schematic sectional view of the pressure fluid storage device for thermo-mass energy storage provided by the present invention with pressure fluid introduced.

[0023] Figure 5It is a schematic flow chart of the usage method of the pressure fluid provided by the present invention.

[0024] Reference numerals: 100, the first storage well; 102, the second storage well; 104, the first gravity column; 106, the second gravity column; 108, the sealing film; 110, the fixed end; 112, the sealing layer; 114, the strength layer; 116, the strip; 118, the laminated area; 120, the positioning area; 122, the first fixing part; 124, the second fixing part; 126, the groove; 128, the positioning mechanism. Detailed implementation manners

[0025] The implementation manners of the present invention will be further described in detail below with reference to the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] As Figures 1 to 4 shown, an embodiment of the first aspect of the present invention provides a pressure fluid storage device for thermal mass energy storage, including: A storage well, the storage well includes a first storage well 100 and a second storage well 102 that are in communication with each other. A fluid interface is provided on the side wall of the second storage well 102. In a plane perpendicular to the central axis of the storage well, the projection of the first storage well 100 covers the projection of the second storage well 102; A first gravity column 104, arranged in the first storage well 100; A second gravity column 106, arranged in the second storage well 102; A sealing film 108, arranged in the second storage well 102 and located between the second gravity column 106 and the second storage well 102. A sealed space is formed between the sealing film 108 and the second storage well 102. The fluid interface is in fluid communication with the sealed space to fill or discharge the pressure fluid into the sealed space. When the pressure fluid is filled, the second gravity column 106 is adapted to switch from a separated position to an engaged position relative to the first gravity column 104. When the pressure fluid is discharged, the second gravity column 106 is adapted to switch from an engaged position to a separated position relative to the first gravity column 104.

[0027] A pressure fluid storage device for thermal mass energy storage according to an embodiment of the first aspect of the present invention, by designing the storage wells as the first storage well 100 and the second storage well 102 that are interconnected and the first storage well 100 covers the second storage well 102 in projection, cleverly utilizes the spatial layout to achieve an efficient energy storage structure design. This unique structure enables the device to reasonably arrange components such as gravity columns in a limited space, providing a stable infrastructure for thermal mass energy storage. Compared with traditional energy storage devices, there is a significant improvement in space utilization efficiency. The first gravity column 104 disposed in the first storage well 100 and the second gravity column 106 disposed in the second storage well 102, in cooperation with the design of the sealing film 108 and the fluid interface, form a flexible gravity column switching mechanism. When a pressure fluid is filled into the sealed space through the fluid interface, the second gravity column 106 can switch from the separated position to the engaged position relative to the first gravity column 104, realizing the change of the energy storage state; when the pressure fluid is discharged, the second gravity column 106 can switch back from the engaged position to the separated position, completing the release of energy. This flexibly switchable mechanism enables the device to dynamically adjust according to the actual energy storage and release requirements, improving the response speed and working efficiency of the energy storage system. More importantly, through the setting of the position switching of the first gravity column 104 and the second gravity column 106, the pressure fluid storage device can achieve low-pressure start-up operation, avoiding the problem of failure to start smoothly. The sealing film 108 is disposed in the second storage well 102 and is located between the second gravity column 106 and the second storage well 102, forming a sealed space with the second storage well 102, ensuring the tightness of the pressure fluid during the filling and discharging processes. It ensures that the pressure fluid can effectively exert a force on the second gravity column 106, thereby realizing the accurate switching of the gravity column and guaranteeing the normal operation of the entire energy storage device. The pressure fluid storage device can realize the switching of the position of the second gravity column 106 by filling and discharging the pressure fluid, so as to adapt to different thermal mass energy storage working conditions. Whether in the case of requiring a large amount of energy storage or in the scenario of quickly releasing energy to meet sudden demands, the pressure fluid storage device can optimize the energy storage and release processes by adjusting the position of the gravity column, providing broader possibilities for the practical application of thermal mass energy storage technology. In terms of structural design, by reasonably utilizing space and simple component combination, complex mechanical structures and expensive sealing materials are avoided, reducing the manufacturing cost of the device.

[0028] Please continue to refer to Figures 1 to 4 , the pressure fluid storage device for thermal mass energy storage according to an embodiment of the first aspect of the present invention, its core structure includes storage wells, the first gravity column 104, the second gravity column 106, and the sealing film 108.

[0029] Among them, the storage well is composed of a first storage well 100 and a second storage well 102 that are interconnected. In a plane perpendicular to the center line of the storage well, the projection of the first storage well 100 covers the projection of the second storage well 102, and a fluid interface is provided on the side wall of the second storage well 102 for charging or discharging pressurized fluid.

[0030] It can be understood that both the first storage well 100 and the second storage well 102 can be set as cylindrical structures. Correspondingly, the diameter of the first storage well 100 is larger than the diameter of the second storage well 102.

[0031] If the first storage well 100 is a cubic structure and the second storage well 102 is a cylindrical structure, the radial dimension of the first storage well 100 needs to be set in a form larger than the diameter of the second storage well 102.

[0032] The first gravity column 104 is placed in the first storage well 100, and the second gravity column 106 is arranged in the second storage well 102. Correspondingly, the structural dimensions of the first gravity column 104 are adapted to the structural dimensions of the first storage well 100, and the structural dimensions of the second gravity column 106 are adapted to the structural dimensions of the second storage well 102.

[0033] A sealing film 108 is arranged in the second storage well 102, and the sealing film 108 is located between the second gravity column 106 and the second storage well 102. Thus, a sealed space is formed between the sealing film 108 and the side wall and bottom wall of the second storage well 102, and this sealed space is in fluid communication with the fluid interface. Through the arrangement of the sealing film 108, it is convenient to achieve flexible sealing of high-strength and large-area high-pressure fluid at the engineering scale.

[0034] When the fluid interface fills the sealed space with pressurized fluid, the sealing film 108 is squeezed by the pressurized fluid, the sealing film 108 floats upward and can drive the second gravity column 106 to switch from the separated position to the engaged position relative to the first gravity column 104. At this time, the second gravity column 106 and the first gravity column 104 are engaged with each other. When the fluid interface discharges the pressurized fluid in the sealed space, the buoyancy exerted by the pressurized fluid in the sealed space on the sealing film 108 decreases. At this time, the second gravity column 106 switches from the engaged position to the separated position under the action of its own gravity. At this time, the second gravity column 106 and the first gravity column 104 are separated from each other.

[0035] It can be understood that by setting the split first gravity column 104 and second gravity column 106, it is beneficial to achieve low-pressure startup of the storage device, and it is not necessary to provide a large pressure to switch the position of the second gravity column 106, avoiding the situation where the second gravity column 106 is in complete contact with the sealing film 108 on the bottom surface of the second storage well 102, resulting in too small a pressure-bearing area of the pressurized fluid and insufficient upward force, which causes the pressurized fluid storage device to fail to start smoothly.

[0036] According to an embodiment of the present invention, a fixed end 110 is provided on the side wall of the second storage well 102, and the end of the sealing film 108 is fixedly connected to the second storage well 102 through the fixed end 110.

[0037] In an embodiment of the present invention, a fixed end 110 is added to the side wall of the second storage well 102. The main purpose of this design is to fix the end of the sealing film 108. The end or edge portion of the sealing film 108 is closely connected to the fixed end 110 through a specific connection method, ensuring that the sealing film 108 can be stably installed in the second storage well 102, so as to form an effective sealed space between the sealing film 108 and the second storage well 102.

[0038] By firmly connecting the end of the sealing film 108 to the second storage well 102 through the fixed end 110, it can ensure that the sealing film 108 can move or deform controllably in the annular space between the second storage well 102 and the second gravity column 106 under the action of fluid pressure, thereby enhancing the stability and reliability of the entire sealing system. This helps to reduce the risk of fluid leakage and the risk of the gravity column tilting, and improves the safety and efficiency of the storage device.

[0039] According to an embodiment of the present invention, the sealing film 108 includes: A sealing layer 112, and the sealing layer 112 is connected to the fixed end 110; A strength layer 114, which is arranged on the side of the sealing layer 112 close to the second gravity column 106, and the strength layer 114 is connected to the fixed end 110.

[0040] In an embodiment of the present invention, the sealing layer 112 is connected to the fixed end 110, directly contacts the pressure fluid on the side close to the second storage well 102, and undertakes the sealing function.

[0041] The strength layer 114 is arranged on the side of the sealing layer 112 close to the second gravity column 106 and is also connected to the fixed end 110. This structural design enables the sealing film 108 to have sufficient strength to cope with the pressure of the pressure fluid and provide a corresponding acting force for the position switching of the second gravity column 106 while ensuring the sealing performance.

[0042] Among them, the sealing layer 112 can select corresponding low-permeability, elastoplastic materials, such as selecting nitrile rubber to make the whole rubber film material; since the sealing layer 112 does not need to consider too much about strength, on the premise that the self-weight of the sealing layer 112 does not cause tearing, the whole rubber film material can be spliced by conventional hot vulcanization splicing or cold bonding, etc., and the technical difficulty and cost are both reasonably controllable.

[0043] The strength layer 114 needs to withstand high pressure without bursting and can withstand repeated bending without fatigue damage. General metal materials are not suitable, and flexible fabric materials woven from high-strength fibers such as high-strength aramid fibers and carbon fibers are most suitable.

[0044] The gravity of the first gravity column 104 and the second gravity column 106 is used to control the constant pressure of the pressure fluid for charging and discharging. At the same time, most of the pressure fluid stored between the second storage well 102 and the sealing film 108 can be discharged at a constant pressure for use, thereby improving the storage efficiency. The cooperation of the first gravity column 104 and the second gravity column 106, with the aid of the gravity principle, assists in the switching of the constant-pressure inflation, storage, and deflation states of the pressure fluid, without the need for additional complex drive mechanisms, reducing the device cost and energy consumption.

[0045] According to an embodiment of the present invention, the strength layer 114 includes at least two strips 116 circumferentially arranged along the center line of the storage well, and the at least two strips 116 enclose a cylindrical structure with an open top.

[0046] In an embodiment of the present invention, using strips 116 instead of a complete layer can significantly reduce the technical difficulty and cost.

[0047] The circumferential arrangement of the strips 116 can enhance the strength and stability of the sealing film 108 in the circumferential direction. The cylindrical structure with an open top allows the strength layer 114 to provide a fitting support for the sealing layer 112 in the longitudinal direction, preventing the sealing layer 112 from deforming excessively under fluid pressure, resulting in thinning or even tearing, and causing fluid leakage.

[0048] In an embodiment of the present invention, aramid fiber strips 116 with a width of W and a length of L can be used to fabricate the strength layer 114, where the length L should be not less than the sum of half of the stroke S of the second gravity column 106 and the diameter D of the second storage well 102, that is, L≥S / 2 + D. The aramid fiber strips 116 are folded in half at an interval of D and fabricated into the strength layer 114 in the form of being overlapped pairwise at a certain angle.

[0049] According to an embodiment of the present invention, along the circumferential direction of the center line of the storage well, at least a part of the edges of adjacent two strips 116 are overlapped to form an overlapping area 118.

[0050] In an embodiment of the present invention, along the circumferential direction of the center line of the storage well, at least a part of the edges of adjacent two strips 116 are overlapped to form an overlapping area 118. This design aims to further enhance the overall strength and stability of the strength layer 114, while ensuring the tight connection between the strips 116, preventing large misalignments between the strips 116 pairwise during dynamic operation, weakening or invalidating the supporting effect on the sealing layer 112, and thus causing the sealing layer 112 to rupture and fail, resulting in fluid leakage.

[0051] Taking two strip materials 116 as an example, during the actual production process of the strength layer 114, it is necessary to ensure that there is an overlapping area 118 with a certain width between the two strip materials 116. The width of the overlapping area 118 is preferably not less than 10 cm. Of course, the width of the overlapping area 118 can be adjusted according to the actual operation situation.

[0052] By overlapping the edges of adjacent strip materials 116, the overall strength of the strength layer 114 is significantly improved. This helps to resist the impact of fluid pressure on the sealing layer 112 and avoid the risk of structural deformation or damage caused by the high fluid pressure.

[0053] According to an embodiment of the present invention, a positioning area 120 corresponding to the second gravity column 106 is formed at the bottom of the strength layer 114.

[0054] In an embodiment of the present invention, the bottom of the strength layer 114 can be laid and marked with a wrinkle-free area that matches the shape of the bottom of the second gravity column 106, and it is ensured that the lengths of each strip material 116 at both ends of this area are the same, so as to form a positioning area 120 corresponding to the second gravity column 106 at the bottom of the strength layer 114.

[0055] To prevent the strength layer 114 from spreading and misaligning during operation and to facilitate the later hoisting of the second gravity column 106, under the condition of uniform stacking and wrinkle-free at the bottom of the strength layer 114, methods such as bonding and sewing can be used to determine and fix the positioning area 120 corresponding to the second gravity column 106. The positioning area 120 of the second gravity column 106 can be a circular area centered on the center of multiple aramid fiber strip materials 116 and based on the radius of the second gravity column 106.

[0056] According to an embodiment of the present invention, the fixed end 110 includes: A first fixing part 122, which is arranged on the side wall of the second storage well 102, and the sealing layer 112 is connected to the first fixing part 122; A second fixing part 124, which is arranged on the side wall of the second storage well 102, and the strength layer 114 is connected to the second fixing part 124.

[0057] In an embodiment of the present invention, the first fixing part 122 is used to firmly fix the sealing layer 112 on the side wall of the second storage well 102. The first fixing part 122 can adopt various connection methods to ensure the tight fit and stable connection between the sealing layer 112 and the side wall of the storage well.

[0058] The second fixing part 124 is used to fix the strength layer 114 on the side wall of the second storage well 102. Similar to the first fixing part 122, the second fixing part 124 can also adopt various connection methods to achieve a firm connection between the strength layer 114 and the side wall of the storage well.

[0059] It should be noted that the distance between the second fixing part 124 and the first fixing part 122 should not be too far to ensure that the strength layer 114 can play a good supporting role for the sealing layer 112. In the embodiment of the present invention, the distance between the fixed end 110 and the bottom of the second storage well 102 should be between half of the stroke S of the second gravity column 106 and the difference between half of the length L of the strip 116 and half of the diameter D of the second storage well 102, that is, the distance between the fixed end 110 and the bottom of the second storage well 102 should be in the range of S / 2 to (L / 2 - D / 2). In this case, the sealing film 108 can ensure that the second gravity column 106 can complete the designed stroke completely under the condition of the shortest consumption of the strip 116.

[0060] According to an embodiment of the present invention, a groove 126 is provided on one side of the first gravity column 104 facing the second gravity column 106, and a positioning mechanism 128 is arranged in the groove 126. The second gravity column 106 is adapted to be positioned with the first gravity column 104 through the positioning mechanism 128.

[0061] In an embodiment of the present invention, by designing the groove 126 and the positioning mechanism 128, the connection accuracy between the second gravity column 106 and the first gravity column 104 can be ensured. This helps to reduce the structural instability caused by improper connection and improve the stability and reliability of the entire structure. It should be noted that when the second gravity column 106 switches from the fitting position to the separation position, a certain connection relationship still needs to be ensured between the second gravity column 106 and the positioning structure. In this way, when the second gravity column 106 switches from the separation position to the fitting position, the positioning connection with the first gravity column 104 can be realized through the positioning and guiding function of the positioning structure.

[0062] As Figure 5 shown, the second aspect embodiment of the present invention proposes a usage method of a pressure fluid storage device for thermal mass energy storage, and this method is applicable to the pressure fluid storage device for thermal mass energy storage described above.

[0063] The usage method mainly includes the following steps: The debugging step, and the debugging step includes: Laying the sealing film 108 in the second storage well 102; Lifting the second gravity column 106 into the second storage well 102 and placing it in the sealing film 108; Lifting the first gravity column 104 into the first storage well 100; Introducing a pressure fluid with a first pressure into the sealed space to make the second gravity column 106 switch from the separation position to the fitting position; Discharge the pressure fluid of the first pressure in the sealed space to switch the second gravity column 106 from the engaged position to the separated position and cycle in this way so that the stacked area 118 in the strength layer 114 is in a steady state; Operating steps, the operating steps include: When the second gravity column 106 is in the separated position, introduce the pressure fluid of the first pressure into the sealed space to switch the second gravity column 106 from the separated position to the engaged position; Introduce the pressure fluid of the second pressure into the sealed space to separate the first gravity column 104 from the first storage well 100 and make the first gravity column 104 and the second gravity column 106 rise as a whole; When the second gravity column 106 is in the engaged position, introduce the pressure fluid of the second pressure into the sealed space to make the first gravity column 104 and the second gravity column 106 rise as a whole.

[0064] According to the usage method of the pressure fluid storage device for thermal mass energy storage provided by the second aspect embodiment of the present invention, the cyclic operation in the debugging step enables the stacked area 118 in the strength layer 114 to reach a steady state, effectively eliminating possible unstable factors inside the device, such as assembly gaps, stress concentration, etc. This provides a solid guarantee for the stability of the device during long-term operation and reduces the risk of failures caused by unstable internal structures. By introducing the pressure fluids of the first pressure and the second pressure respectively, it is possible to precisely control the switching of the second gravity column 106 between the separated position and the engaged position, and to achieve the overall rising action of the first gravity column 104 and the second gravity column 106. This precise position control ability enables the device to flexibly adjust the position of the gravity column according to the different working conditions of the thermal mass energy storage system, thereby efficiently completing the energy storage and release processes. In the operating steps, whether the second gravity column 106 is in the separated position or the engaged position, the overall rising of the gravity column can be achieved by introducing the pressure fluid of the corresponding pressure, demonstrating the good working condition adaptability of the device. It is possible to quickly respond to and adjust the device state according to the energy changes in different stages of the thermal mass energy storage system, improving the working efficiency and reliability of the entire thermal mass energy storage system. The steps of the entire usage method are clear. By controlling the introduction and discharge of the pressure fluid, the debugging and operation of the device can be achieved. Compared with some complex mechanical operation methods, this method based on pressure fluid control is more convenient, and at the same time can quickly change the position of the gravity column, improving the operation efficiency of the device and being conducive to large-scale application in actual thermal mass energy storage scenarios.

[0065] Please continue to refer to Figure 5 The second aspect embodiment of the present invention proposes a usage method of a pressure fluid storage device for thermal mass energy storage, and this usage method is applicable to the pressure fluid storage device described above.

[0066] Specifically, the usage method of the pressure fluid storage device for thermal mass energy storage mainly includes a commissioning step and an operation step.

[0067] Among them, in the commissioning step: First, carefully lay the sealing film 108 in the second storage well 102 to lay the foundation for forming a sealed space later. This step requires that the sealing film 108 be laid flat and without damage to ensure a good sealing effect.

[0068] Precisely hoist the second gravity column 106 into the second storage well 102 and place it inside the sealing film 108. The hoisting process needs to strictly control the accuracy to avoid damaging the sealing film 108 by the second gravity column 106.

[0069] Then hoist the first gravity column 104 into the first storage well 100 to complete the initial placement of the first gravity column 104.

[0070] Introduce a pressure fluid with a first pressure into the sealed space. The acting force generated by the pressure fluid pushes the second gravity column 106, enabling it to smoothly switch from the separated position to the engaged position.

[0071] In this step, by introducing a pressure fluid with a first pressure into the sealed space (i.e., the space between the second storage well 102 and the sealing film 108), the sealing film 108 is subjected to the pressure of the pressure fluid. Correspondingly, the pressure fluid generates a certain buoyancy force on the bottom of the second gravity column 106. In this step, since the weight of the sealing film 108 is almost negligible compared to the weight of the second gravity column 106, thus, at this time, the pressure exerted by the pressure fluid on the bottom of the second gravity column 106 and the gravity of the second gravity column 106 need to meet the requirements of the following formula: P·π·(D 2 / 2 - d 2 / 2) > G; Wherein, P is the pressure, D is the diameter of the second storage well 102, d is the diameter of the second gravity column 106, and G is the gravity of the second gravity column 106.

[0072] Meanwhile, in this step, the sealing film 108 floats under the action of the pressure fluid. Since the strength layer 114 has high strength and low ductility, thus, when the strength layer 114 is fully tensioned, it will drive the second gravity column 106 to move upward until the second gravity column 106 is engaged with the first gravity column 104. At this time, the sealing film 108 bulges upward.

[0073] Subsequently, the pressure fluid with the first pressure in the sealed space is discharged. Under the action of its own gravity and the like, the second gravity column 106 switches back from the engaged position to the separated position. By operating in this cycle, the stacked area 118 in the strength layer 114 gradually reaches a steady state. Through the cyclic operation, unstable factors such as possible assembly stresses can be effectively eliminated, ensuring the stability of the device during subsequent operation.

[0074] In the operation step: When the second gravity column 106 is in the separated position, the pressure fluid with the first pressure is introduced into the sealed space again, prompting the second gravity column 106 to switch to the engaged position again.

[0075] Immediately afterwards, the pressure fluid with the second pressure is introduced. The pressure fluid with the second pressure is sufficient to separate the first gravity column 104 from the first storage well 100 and can drive the first gravity column 104 and the second gravity column 106 to move upward as a whole. By adjusting the pressure of the introduced fluid, precise control of the overall position of the first gravity column 104 and the second gravity column 106 is achieved.

[0076] When the second gravity column 106 is already in the engaged position, the pressure fluid with the second pressure is directly introduced into the sealed space to achieve the effect of the overall upward movement of the first gravity column 104 and the second gravity column 106, providing the necessary mechanical action support for the storage and release of energy during the heat and mass energy storage process.

[0077] According to an embodiment of the present invention, the sealing film 108 includes a sealing layer 112 and a strength layer 114. A stacked area 118 and a positioning area 120 are formed in the strength layer 114; The debugging step further includes: Centering the positioning area 120 with the center of the second storage well 102; The step of hoisting the second gravity column 106 to the second storage well 102 and placing it in the sealing film 108 includes: Aligning the second gravity column 106 with the positioning area 120; The usage method further includes: Repeatedly filling and discharging the pressure fluid into the sealed space to make the stacked area 118 in a steady state; The operation step further includes: When the first gravity column 104 and the second gravity column 106 move upward as a whole to the upper limit position, the fluid interface is closed; After the operation step, there is also a discharging step. The discharging step includes: Discharging the pressure fluid with the second pressure, opening the fluid interface to discharge the pressure fluid with the second pressure. When the bottom of the first gravity column 104 contacts the bottom of the first storage well 100, the fluid interface is closed; Or, The pressure fluid of the second pressure is discharged together with the pressure fluid of the first pressure. The fluid interface is opened to discharge the pressure fluid of the second pressure. When the bottom of the first gravity column 104 contacts the bottom of the first storage well 100, the discharge of the pressure fluid of the second pressure is completed. During the process of switching the second gravity column 106 from the engaged position to the separated position, the pressure fluid of the first pressure is discharged. After the discharge of the pressure fluid of the first pressure, the fluid interface is closed.

[0078] In an embodiment of the present invention, the sealing film 108 is composed of a sealing layer 112 and a strength layer 114. A stacking area 118 and a positioning area 120 are provided in the strength layer 114. This structural design not only ensures the sealing performance of the sealing film 108 (achieved through the sealing layer 112), but also improves the overall strength and stability of the sealing film 108 through the strength layer 114. The settings of the stacking area 118 and the positioning area 120 provide a structural basis for subsequent operations and the operation of the device.

[0079] The debugging steps further include: First, align the positioning area 120 of the strength layer 114 with the center of the second storage well 102 to ensure accurate positioning, providing an accurate position reference for the subsequent placement of the second gravity column 106.

[0080] When hoisting the second gravity column 106 to the second storage well 102 and placing it in the sealing film 108, the second gravity column 106 needs to be aligned with the positioning area 120 to ensure the accuracy and stability of the placement of the second gravity column 106.

[0081] The debugging process also includes repeatedly filling and discharging the pressure fluid into the sealing space to make the stacking area 118 reach a steady state, further optimizing the structural performance of the sealing film 108 and eliminating possible structural instability factors.

[0082] The operation steps further include: When the first gravity column 104 and the second gravity column 106 rise as a whole to the upper limit position, the fluid interface is closed and the supply of the pressure fluid is stopped to prevent the gravity column from rising excessively, playing a role in protecting the device and controlling the operating state.

[0083] After the operation steps, there is also a discharge step, and the discharge step includes two different discharge situations: Situation 1: Discharge of the pressure fluid of the second pressure: Open the fluid interface to discharge the pressure fluid of the second pressure. When the bottom of the first gravity column 104 contacts the bottom of the first storage well 100, close the fluid interface to complete the discharge of the pressure fluid of the second pressure, and restore the device to a certain initial state.

[0084] Situation 2: The pressure fluid of the second pressure is discharged together with the pressure fluid of the first pressure: First, open the fluid interface to discharge the pressure fluid of the second pressure. When the bottom of the first gravity column 104 contacts the bottom of the first storage well 100, the discharge of the pressure fluid of the second pressure is completed. During the process of switching the second gravity column 106 from the engaged position to the separated position, the pressure fluid of the first pressure is discharged. After the discharge of the pressure fluid of the first pressure, close the fluid interface. This discharge method discharges fluids of different pressures step by step according to different states and requirements of the device, realizing the orderly recovery of the device state.

[0085] The layered structure of the sealing film 108 and the settings of the laminated area 118 and the positioning area 120 in the strength layer 114 enhance the performance of the sealing film 108. The alignment of the positioning area 120 with the center of the second storage well 102 and the placement of the second gravity column 106 aligned with the positioning area 120 ensure the correct installation and use of the sealing film 108 in the device, reducing the risk of sealing failure or structural damage caused by improper installation, and improving the reliability and service life of the sealing film 108. Repeatedly filling and discharging the pressure fluid into the sealing space to make the laminated area 118 reach a steady state further optimizes the structural performance of the sealing film 108, ensuring that the sealing film 108 can function stably during the operation of the device. This helps to eliminate problems such as possible stress concentration and structural deformation inside the sealing film 108, improving the overall stability and reliability of the device. In the operation step, closing the fluid interface when the gravity column rises to the upper limit, and precisely controlling the discharge of the pressure fluid according to different situations in the discharge step can achieve precise control of the device operation state. It avoids abnormal situations such as excessive rising and falling during the operation of the device, ensuring the safety and stability of the device operation, and at the same time improving the energy storage and release efficiency of the device. Two different pressure fluid discharge methods are provided in the discharge step, and users can choose the appropriate discharge method according to actual needs and the specific state of the device. This flexibility enables the device to better adapt to different working scenarios and working condition changes, improving the versatility and practicality of the device. Through precise installation, commissioning and operation control, as well as reasonable discharge methods, the wear and damage between the components of the device are reduced, the probability of failure is lowered, thereby extending the service life of the entire pressure fluid storage device for thermal mass energy storage and reducing the maintenance cost.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure fluid storage device for thermal mass energy storage, characterized in that: include: A storage well, the storage well comprising a first storage well (100) and a second storage well (102) which are interconnected, a side wall of the second storage well (102) being provided with a fluid interface, and in a plane perpendicular to a center line of the storage well, a projection of the first storage well (100) covers a projection of the second storage well (102); A first gravity column (104), disposed in the first storage well (100); A second gravity column (106), disposed in the second storage well (102); A sealing membrane (108) is arranged in the second storage well (102) and is located between the second gravity column (106) and the second storage well (102). A sealed space is formed between the sealing membrane (108) and the second storage well (102). The fluid interface is fluidly connected to the sealed space to fill or discharge a pressure fluid into or out of the sealed space. When the pressure fluid is filled, the second gravity column (106) is suitable for switching from a separated position to an engaged position relative to the first gravity column (104). When the pressure fluid is discharged, the second gravity column (106) is suitable for switching from the engaged position to the separated position relative to the first gravity column (104).

2. The pressure fluid storage device for thermal mass energy storage according to claim 1, characterized in that: The side wall of the second storage well (102) is provided with a fixed end (110), and the end of the sealing film (108) is fixedly connected to the second storage well (102) via the fixed end (110).

3. The pressure fluid storage device for thermal mass energy storage according to claim 2, characterized in that: The sealing film (108) comprises: A sealing layer (112), the sealing layer (112) being connected to the fixed end (110); A strength layer (114) is arranged on a side of the sealing layer (112) close to the second gravity column (106), and the strength layer (114) is connected to the fixed end (110).

4. The pressure fluid storage device for thermal mass energy storage according to claim 3, characterized in that: The strength layer (114) comprises at least two strips (116) arranged circumferentially along the center line of the storage well, and the at least two strips (116) are arranged to form a cylindrical structure with an open top.

5. The pressure fluid storage device for thermal mass energy storage according to claim 4, characterized in that: Along the circumference of the centerline of the storage well, the edges of two adjacent strips (116) are at least partially stacked to form a stacking area (118).

6. The pressure fluid storage device for thermal mass energy storage according to claim 4, characterized in that: A positioning area (120) corresponding to the second gravity column (106) is formed at the bottom of the strength layer (114).

7. The pressure fluid storage device for thermal mass energy storage according to claim 3, characterized in that: The fixed end (110) comprises: A first fixing portion (122) is arranged on a side wall of the second storage well (102), and the sealing layer (112) is connected to the first fixing portion (122); The second fixing portion (124) is arranged on the side wall of the second storage well (102), and the strength layer (114) is connected to the second fixing portion (124).

8. The pressure fluid storage device for thermal mass energy storage according to any one of claims 1 to 7, characterized in that: A groove (126) is provided on a side of the first gravity column (104) facing the second gravity column (106), a positioning mechanism (128) is provided in the groove (126), and the second gravity column (106) is suitable for being positioned with the first gravity column (104) through the positioning mechanism (128).

9. A method for using the pressure fluid storage device for thermal mass energy storage according to any one of claims 1 to 8, characterized in that: include: The debugging step includes: Laying the sealing film (108) in the second storage well (102); The second gravity column (106) is hoisted to the second storage well (102) and placed in the sealing film (108); Hoisting the first gravity column (104) to the first storage well (100); Introducing a pressure fluid of a first pressure into the sealed space so that the second gravity column (106) switches from the separated position to the engaged position; Discharging the pressure fluid of the first pressure in the sealed space to switch the second gravity column (106) from the engaged position to the separated position and performing a cycle to keep the stacking area (118) in the strength layer (114) in a steady state; The operation steps include: When the second gravity column (106) is in the separated position, a pressure fluid of a first pressure is introduced into the sealed space so that the second gravity column (106) switches from the separated position to the engaged position; Introducing a pressure fluid of a second pressure into the sealed space to separate the first gravity column (104) from the first storage well (100), and to cause the first gravity column (104) and the second gravity column (106) to rise as a whole; When the second gravity column (106) is in the engaged position, a pressure fluid of a second pressure is introduced into the sealed space so that the first gravity column (104) and the second gravity column (106) rise as a whole.

10. The method of use according to claim 9, characterized in that: The sealing film (108) comprises a sealing layer (112) and a strength layer (114), wherein a lamination area (118) and a positioning area (120) are formed in the strength layer (114); The debugging step also includes: Aligning the positioning area (120) with the center of the second storage well (102); The step of hoisting the second gravity column (106) to the second storage well (102) and placing it in the sealing film (108) comprises: Aligning the second gravity column (106) with the positioning area (120); The method of use also includes: Repeatedly filling and discharging a pressure fluid into the sealed space to keep the stacking area (118) in a steady state; The operation steps also include: When the first gravity column (104) and the second gravity column (106) rise to an upper limit position as a whole, closing the fluid interface; The method further comprises a discharge step after the operation step, wherein the discharge step comprises: Discharging the pressure fluid of the second pressure, opening the fluid interface to discharge the pressure fluid of the second pressure, and closing the fluid interface when the bottom of the first gravity column (104) contacts the bottom of the first storage well (100); or, The pressure fluid of the second pressure is discharged together with the pressure fluid of the first pressure, and the fluid interface is opened to discharge the pressure fluid of the second pressure. When the bottom of the first gravity column (104) contacts the bottom of the first storage well (100), the pressure fluid of the second pressure is discharged. In the process of switching the second gravity column (106) from the engaged position to the separated position, the pressure fluid of the first pressure is discharged. After the pressure fluid of the first pressure is discharged, the fluid interface is closed.

Images