Liquid phase change heat removal and exchange device and energy storage heat exchange system

Abstract

The utility model discloses a liquid phase change heat extraction heat exchange device and an energy storage heat exchange system, the heat exchange device comprises a solution box and a plurality of energy storage boxes installed in a containing cavity, the containing cavity with an opening is arranged in the solution box, and the side wall of the solution box is provided with a water inlet and a water outlet which are communicated with the containing cavity; the multiple energy storage boxes are arranged in the containing cavity at intervals, so that gaps between the energy storage boxes form runners, and a water injection opening is formed in the top of each energy storage box and used for injecting phase change liquid into the energy storage box. A secondary refrigerant is injected into the solution box through the water inlet, enters the flow channel and exchanges heat with the phase change liquid in each energy storage box, so that the phase change liquid is subjected to phase change, and the secondary refrigerant is discharged through the water outlet. The technical scheme of the utility model has the advantages of strong practicability, cleanness, environmental protection, flexible and convenient arrangement, resource saving and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of phase change energy storage, and in particular to a liquid phase change heat extraction and heat exchange device and an energy storage and heat exchange system. Background Art

[0002] Under the national policy of energy conservation and emission reduction, the major transition from a modern energy system driven by fossil fuels to a renewable and sustainable energy system poses a considerable challenge to both industrial and academic sectors. The use of heat pump technology to extract heat from low-grade heat sources to supply heat users has huge energy-saving and economic value and is one of the important technologies to meet this challenge.

[0003] The traditional water source heat pump system extracts the sensible heat of the water temperature change, and the energy utilization rate is low. Due to the limitation of water volume, water distance and water temperature, it can only realize small-scale, decentralized heating production, which makes the resources not fully utilized. The latent heat released when the liquid changes phase is often greater than the sensible heat released when the temperature of the same mass of liquid changes by 1°C. Taking water as an example, the latent heat released by freezing 1kg of water is 335kJ, which is 80 times the sensible heat released when 1kg of water drops by 1°C. Therefore, the rational use of the phase change heat of the liquid can improve the energy utilization rate.

[0004] In the related technology, the existing phase change heat generator that uses the latent heat of water phase change as a heat source has a bulky structure and requires ice melting when taking ice, which consumes a lot of energy and causes waste of resources. In addition, there are technical problems such as complex structure, low ice melting efficiency and waste of resources. Utility Model Content

[0005] The purpose of the utility model is to provide a liquid phase change heat extraction and heat exchange device and an energy storage heat exchange system to solve the problem mentioned in the above background technology that ice melting is required when taking ice.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid phase change heat extraction and heat exchange device, comprising:

[0008] A solution box, wherein an open receiving cavity is provided in the solution box, and a water inlet and a water outlet communicating with the receiving cavity are provided on a side wall of the solution box;

[0009] A plurality of energy storage boxes installed in the accommodating cavity, wherein the plurality of energy storage boxes are spaced apart in the accommodating cavity so that the gaps between each of the energy storage boxes form a flow channel, and a water injection port is provided on the top of each of the energy storage boxes for injecting phase change liquid into the energy storage box;

[0010] Among them, the coolant is injected into the solution tank through the water inlet, the coolant enters the flow channel and exchanges heat with the phase change liquid in each energy storage box to cause the phase change liquid to undergo a phase change, and the coolant is discharged through the water outlet.

[0011] Optionally, a mounting slot frame is further provided in the accommodating cavity, and the mounting slot frame is used to install a plurality of the energy storage boxes.

[0012] Optionally, the mounting slot frame includes a main frame and a plurality of mounting frames connected to the lower end of the main frame, the main frame is connected to the top side wall of the accommodating cavity, the bottoms of the plurality of mounting frames abut against the bottom wall of the accommodating cavity, and the plurality of mounting frames are spaced apart along the length or width direction of the main frame for installing a plurality of energy storage boxes.

[0013] Optionally, the mounting frame is a skeleton-type structure and its internal contour is adapted to the shape of the energy storage box.

[0014] Optionally, a liquid level gauge is further provided on the top of the energy storage box, and the liquid level gauge is used to monitor the liquid level of the phase change liquid in the energy storage box.

[0015] Optionally, a detachable cover is provided on the water filling port, and the cover is used to close the energy storage box.

[0016] Optionally, an exhaust valve connected to the interior of the energy storage box is further provided on the top of the energy storage box, and the exhaust valve is used to extract the gas inside the energy storage box after the phase change liquid is injected to make it into a vacuum state.

[0017] Optionally, a lifting ring is also provided on the top of the energy storage box.

[0018] Optionally, the water inlet and the water outlet are arranged on two opposite sides of the solution tank, and the water inlet is close to the bottom of the accommodating cavity, and the water outlet is close to the top of the accommodating cavity.

[0019] A modular liquid phase change heat storage heat exchange system comprises a heat exchange device provided in any one of the above embodiments, as well as an energy storage chamber, a lifting device and a heat pump unit, wherein the energy storage chamber is arranged on one side of the heat exchange device, and the lifting device is arranged above the heat exchange device and the energy storage chamber to transport the energy storage box back and forth between the energy storage chamber and the heat exchange device, the evaporator inlet end of the heat pump unit is connected to the water inlet through a pipeline, and the evaporator outlet end of the heat pump unit is connected to the water outlet through a pipeline.

[0020] The beneficial effects of the utility model are as follows: the liquid phase change heat extraction and heat exchange device of the utility model solves the technical problems in the prior art that ice melting is required when taking ice, the ice melting efficiency is low, and resources are wasted, and achieves the following beneficial effects: 1) through the arrangement of multiple energy storage boxes and the combination of energy storage boxes and solution boxes, the phase change liquid in the energy storage box is directly taken out of the solution box after freezing, eliminating the ice melting operation and saving resources. At the same time, the energy storage box adds protection measures for the ice, the ice taking process is simpler and the ice will not fall off in the energy storage box; 2) by installing the slot frame The ingenious structure of setting and installing the trough rack can realize the rapid fixation of multiple energy storage boxes, which is convenient for the quick removal and placement of the energy storage boxes; 3) A liquid level gauge is set on the energy storage box through the energy storage box to realize the convenient injection of phase change liquid and monitoring of the liquid amount, so as to prevent the energy storage box from being damaged after the injected liquid changes phase excessively; 4) An exhaust valve is set on the energy storage box to realize the vacuum state in the energy storage box, reduce the pressure of water during the expansion process, and reduce the risk of damage to the energy storage box; 5) A lifting ring is set on the top of the energy storage box to realize the convenient removal and placement of the energy storage box, thereby improving the removal and placement efficiency.

[0021] The modular liquid phase change heat storage and heat exchange system of the utility model solves the problems of complex structure, low ice melting efficiency and waste of resources in the existing related technologies, and achieves beneficial effects: through the modular design of the overall structure, the number of energy storage tanks and the volume of the solution tank can be increased or decreased according to user needs, the layout is more flexible and convenient, the overall equipment occupies less space, and the utilization rate is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 is a first cross-sectional view of the overall structure of the liquid phase change heat exchange device according to an embodiment of the utility model;

[0024] Figure 2 is a second cross-sectional view of the overall structure of the liquid phase change heat exchange device according to an embodiment of the utility model;

[0025] Figure 3 is a cross-sectional view of an energy storage box of a liquid phase change heat exchange device according to an embodiment of the utility model;

[0026] Figure 4 It is a top view of a solution tank with a mounting tank frame installed in a liquid phase change heat exchange device according to an embodiment of the utility model;

[0027] Figure 5It is a structural schematic diagram of a mounting slot frame of a liquid phase change heat exchange device according to an embodiment of the utility model;

[0028] Figure 6 It is a structural schematic diagram of a modular liquid phase change heat storage and heat exchange system according to an embodiment of the utility model.

[0029] Among them, 1. energy storage box, 2. liquid level meter, 3. exhaust valve, 4. sealing cover, 5. water filling port, 6. lifting ring, 7. phase change liquid, 8. solution box, 9. mounting trough, 10. flow channel, 11. water inlet, 12. water outlet, 13. vacuum section, 91. main frame, 92. mounting frame, 101. heat exchange device, 102. energy storage chamber, 1021. fan, 103. lifting device, 1031. hook, 104. heat pump unit, 105. heat user. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0031] In the description of the embodiments of the present invention, it needs to be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0032] Below, refer to Figures 1 to 6 The liquid phase change heat extraction and heat exchange device and the energy storage and heat exchange system involved in the embodiments of the present utility model are specifically described.

[0033] The first embodiment of the present utility model provides a liquid phase change heat extraction and heat exchange device 101.

[0034] like Figure 1-5As shown, a liquid phase change heat exchange device 101 comprises a solution tank 8 and a plurality of energy storage tanks 1 installed in the accommodating cavity, wherein the solution tank 8 is provided with an open accommodating cavity, and a water inlet 11 and a water outlet 12 communicating with the accommodating cavity are provided on the side wall of the solution tank 8; the plurality of energy storage tanks 1 are arranged at intervals in the accommodating cavity so that the gaps between each of the energy storage tanks 1 form a flow channel 10, and a water injection port 5 is provided on the top of each of the energy storage tanks 1 for injecting phase change liquid 7 into the energy storage tank 1; wherein, a coolant is injected into the solution tank 8 through the water inlet 11, and the coolant enters the flow channel 10 to exchange heat with the phase change liquid 7 in each of the energy storage tanks 1 so that the phase change liquid 7 undergoes a phase change, and the coolant is discharged through the water outlet 12.

[0035] In this embodiment, the phase change liquid 7 may be water, and the freezing phase change of water is taken as an example for description.

[0036] In this embodiment, by setting up a plurality of energy storage boxes 1 and combining the energy storage boxes 1 with the solution box 8, the phase change liquid 7 in the energy storage box 1 is directly removed from the solution box 8 after freezing, eliminating the ice melting operation and saving resources. At the same time, the energy storage box 1 adds protection measures for ice, making the ice removal process simpler and the ice will not fall off in the energy storage box 1. The flow channel 10 formed by the plurality of energy storage boxes 1 arranged at intervals in the accommodating cavity can make the coolant evenly exchange heat with each phase change liquid 7, thereby improving the heat exchange efficiency. As a result, the heat exchange device 101 of this embodiment has the advantages of strong practicality, clean and environmental protection, flexible and convenient layout, and resource saving.

[0037] like Figure 5 As shown, in one example, in order to make the energy storage box 1 more convenient to install and disassemble and more stable after installation, the accommodating cavity is also provided with a mounting slot frame 9, so that multiple energy storage boxes 1 can be directly installed in the mounting slot frame 9. The mounting slot frame 9 includes a main frame 91 and multiple mounting frames 92 connected to the lower end of the main frame 91. The main frame 91 is connected to the top side wall of the accommodating cavity, and the bottoms of the multiple mounting frames 92 are abutted against the bottom wall of the accommodating cavity. The multiple mounting frames 92 are arranged at intervals along the length or width direction of the main frame 91 for installing multiple energy storage boxes 1. In order to save manufacturing materials and reduce equipment costs, the mounting frame 92 is a skeleton structure and its internal contour is adapted to the shape of the energy storage box 1. When used, each energy storage box 1 can be directly placed in the mounting frame 92 above the main frame 91 to achieve fixation, and when the mounting frame 92 needs to be melted and taken out, the energy storage box 1 can be directly taken out from the top of the main frame 91.

[0038] like Figure 2 and Figure 4 As shown, in an optional embodiment, the water inlet 11 and the water outlet 12 are arranged on two opposite sides of the solution tank 8, and the water inlet 11 is close to the bottom of the accommodating cavity, and the water outlet 12 is close to the top of the accommodating cavity. In this way, the coolant can flow into each flow channel 10 more evenly and fully contact each energy storage tank 1, thereby fully exchanging heat with the phase change liquid 7 in each energy storage tank 1, thereby improving the heat exchange efficiency.

[0039] like Figure 2 and Figure 3 As shown, in one embodiment, a detachable closing cover is further provided on the water injection port, and the closing cover is used to close the energy storage box 1. The top of the energy storage box 1 is also provided with an exhaust valve 3 connected to the inside of the energy storage box 1, and the exhaust valve 3 is used to extract the gas inside the energy storage box 1 after the phase change liquid 7 is injected to make it a vacuum state. The top of the energy storage box 1 is also provided with a liquid level meter 2, and the liquid level meter 2 is used to monitor the liquid level of the phase change liquid 7 in the energy storage box 1, so as to realize the convenient injection and liquid amount monitoring of the phase change liquid 7, so as to prevent the energy storage box 1 from being damaged after the injected liquid changes phase in excess.

[0040] In an exemplary demonstration, in actual use, water is injected into the energy storage tank 1 through the water injection port 5, and the water injection is stopped after the liquid level in the energy storage tank 1 reaches a preset position monitored by the liquid level meter 2. Then, the cover 4 of the water injection port 5 is covered, and the gas in the energy storage tank 1 is extracted through the exhaust valve 3 by a vacuum pump so that the non-water-injected part of the energy storage tank 1 becomes a vacuum section 13, so as to reduce the pressure of water during the expansion process and reduce the risk of damage to the energy storage tank 1.

[0041] It should be noted that the exhaust valve 3 may use a needle valve, and the amount of water injected into the energy storage box 1 may be 0.9 times the volume of the energy storage box 1 to prevent the volume of water from increasing after freezing and damaging the energy storage box 1. The cover 4 and the water injection port 5 may be connected in the form of a threaded cover.

[0042] like Figure 5 As shown, in an optional embodiment, a lifting ring 6 is further provided on the top of the energy storage box 1 , so that the energy storage box 1 can be conveniently carried through the lifting ring 6 .

[0043] It should be noted that, in this embodiment, the phase change liquid 7 may also be other liquids, the material of the energy storage box 1 may be a material with good expansion properties, and the solution box 8 may be a transparent material or a non-transparent material.

[0044] Therefore, the liquid phase change heat extraction and heat exchange device 101 provided in this embodiment solves the technical problems of complex structure, low ice melting efficiency and waste of resources in the existing related technologies, and achieves beneficial effects: 1) through the arrangement of multiple energy storage boxes 1 and the combination of the energy storage box 1 and the solution box 8, the phase change liquid 7 in the energy storage box 1 is directly removed from the solution box 8 after freezing, eliminating the ice melting operation and saving resources. At the same time, the energy storage box 1 adds protection measures for ice, the ice removal process is simpler and the ice will not fall off in the energy storage box 1; 2) through the arrangement of the installation slot frame 9 and the ingenious structure of the installation slot frame 9, the multiple energy storage boxes 1 can be quickly fixed, which is convenient for the quick removal and placement of the energy storage box 1; 3) By setting a liquid level meter 2 on the energy storage box 1, convenient injection of the phase change liquid 7 and monitoring of the liquid amount can be achieved to prevent the injected liquid from damaging the energy storage box 1 after excessive phase change; 4) By setting an exhaust valve 3 on the energy storage box 1, the energy storage box 1 can be evacuated into a vacuum state, the pressure of water during the expansion process can be reduced, and the risk of damage to the energy storage box 1 can be reduced; 5) By setting a lifting ring 6 on the top of the energy storage box 1, the energy storage box 1 can be conveniently taken in and out, thereby improving the efficiency of taking in and out; 6) Through the modular design of the overall structure, the number of energy storage boxes 1 and the volume of the solution box 8 can be increased or decreased according to user needs, the layout is more flexible and convenient, the overall equipment occupies less space, and the utilization rate is higher.

[0045] The second embodiment of the utility model provides a modular liquid phase change heat storage and heat exchange system.

[0046] like Figure 6 As shown, a modular liquid phase change heat storage heat exchange system includes a heat exchange device 101 and an energy storage chamber 102, a lifting device 103 and a heat pump unit 104 provided in any one of the first embodiments described above, wherein the energy storage chamber 102 is disposed on one side of the heat exchange device 101, and the lifting device 103 is disposed above the heat exchange device 101 and the energy storage chamber 102 for transporting the energy storage box 1 back and forth between the energy storage chamber 102 and the heat exchange device 101, and the evaporator inlet end of the heat pump unit 104 is connected to the water inlet 11 through a pipeline, and the evaporator outlet end of the heat pump unit 104 is connected to the water outlet 12 through a pipeline.

[0047] For example, when heating in winter, the following implementation method can be used:

[0048] The hook 1031 is hung on the lifting ring 6 of the energy storage box 1, and the energy storage box 1 is placed in the mounting groove frame 9 in the solution tank 8 through the lifting device 103 to be fixed, so that a flow channel 10 is formed between the energy storage box 1 and the solution tank 8, between the energy storage boxes 1, and between the mounting groove frame 9 and the solution tank 8 for the coolant to flow;

[0049] After the energy storage box 1 is fixed in the mounting slot frame 9, the cover 4 is opened, and water is injected into the energy storage box 1 from the water injection port 5. Since the density of water after the phase change is less than that before the phase change, in order to prevent the water from bursting the energy storage box 1 after freezing, the water injection amount should be 0.9 times the volume of the energy storage box 1. The water injection amount is observed by the liquid level meter 2. After the water injection is completed, the cover 4 is used to block the water injection port 5, and the air in the energy storage box 1 is extracted from the exhaust valve 3 using a vacuum pump to form a vacuum section 13;

[0050] The refrigerant enters the solution tank 8 through the water inlet 11, flows through the energy storage tank 1 in the flow channel 10, and indirectly exchanges heat with the heat source water. The water undergoes a phase change and freezes to release latent heat. After the refrigerant exchanges heat with the water, it flows out of the solution tank 8 through the water outlet 12. The refrigerant circulates and exchanges heat between the evaporator of the heat pump unit 104 and the heat exchange device 101 through a water pump. The water in the energy storage tank 1 thus supplies heat to the heat user 105 through the heat pump unit 104.

[0051] When the energy storage box 1 needs to be replaced, after all the heat source water in the energy storage box 1 is frozen, the lifting ring 6 is hooked by the lifting device 103 to take the energy storage box 1 out of the installation slot frame 9 for storage, and the lifting process is repeated to complete the heat exchange cycle.

[0052] The taken out energy storage box 1 is placed in the energy storage chamber 102 to melt the ice, and after melting the ice, it is still placed in the mounting slot frame 9 for fixed use, or transported to a place where a cold source is needed, and hoisted and fixed in the mounting slot frame 9. The frozen energy storage box 1 is used as a cold source and the heat pump unit 104 extracts cold energy to supply cold users. Here, a fan 1021 is provided on the energy storage chamber 102 to accelerate the ice melting rate.

[0053] Exemplarily, during summer cooling, the following implementation method can be used:

[0054] The heat exchange system of this embodiment can be used in a cold storage system for shifting peaks and filling valleys in electricity prices during summer cooling, and the process of hoisting and injecting phase change liquid 7 is the same as that of the winter heating mode.

[0055] When the electricity price is at the valley value, the refrigerant enters the solution tank 8 through the water inlet 11, flows through the energy storage tank 1 in the flow channel 10 and indirectly exchanges heat with the water, the water undergoes phase change and freezes to release latent heat, and the refrigerant exchanges heat with the water and flows out of the solution tank 8 through the water outlet 12. The refrigerant circulates and exchanges heat between the evaporator of the heat pump unit 104 and the heat exchange device 101 through the water pump, and the water in the energy storage tank 1 will freeze to store the cold. When the electricity price is at the peak value, the refrigerant enters the solution tank 8 through the water inlet 11, flows through the energy storage tank 1 in the flow channel 10 and indirectly exchanges heat with the ice, the ice undergoes phase change and melts to absorb latent heat, and the refrigerant exchanges heat with the water and flows out of the solution tank 8 through the water outlet 12. The condenser and evaporator of the heat pump unit 104 can be connected to the phase change heat exchange device 101 through a four-way reversing valve. The refrigerant circulates between the condenser of the heat pump unit 104 and the heat exchange device 101 through a water pump to exchange heat, and the frozen energy storage tank 1 releases cold energy to provide cooling for cold users.

[0056] Therefore, the energy storage and heat exchange system provided in this embodiment solves the technical problems of complex structure, low ice melting efficiency and waste of resources in the existing related technologies. Through the modular design of the overall structure, the number of energy storage boxes 1 and the volume of the solution tank 8 can be increased or decreased according to user needs. The layout is more flexible and convenient, the overall equipment occupies less space, and the utilization rate is higher.

[0057] In addition, the terms "first" and "another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, "multiple" and "several" mean at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "one example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid phase change heat exchange device (101), characterized in that: include: A solution box (8), wherein an open receiving cavity is provided in the solution box (8), and a water inlet (11) and a water outlet (12) communicating with the receiving cavity are provided on a side wall of the solution box (8); A plurality of energy storage boxes (1) are installed in the accommodating cavity, the plurality of energy storage boxes (1) are arranged at intervals in the accommodating cavity so that the gaps between each of the energy storage boxes (1) form a flow channel (10), and a water injection port (5) is provided on the top of each of the energy storage boxes (1) for injecting a phase change liquid (7) into the energy storage box (1); The coolant is injected into the solution tank (8) through the water inlet (11), enters the flow channel (10) and exchanges heat with the phase change liquid (7) in each energy storage tank (1), causing the phase change liquid (7) to undergo a phase change, and the coolant is discharged through the water outlet (12).

2. The liquid phase change heat exchange device (101) according to claim 1, characterized in that: A mounting slot frame (9) is also provided in the accommodating cavity, and the mounting slot frame (9) is used to mount a plurality of the energy storage boxes (1).

3. The liquid phase change heat exchange device (101) according to claim 2, characterized in that: The mounting slot frame (9) comprises a main frame (91) and a plurality of mounting frames (92) connected to the lower end of the main frame (91); the main frame (91) is connected to the top side wall of the accommodating cavity; the bottoms of the plurality of mounting frames (92) abut against the bottom wall of the accommodating cavity; the plurality of mounting frames (92) are arranged at intervals along the length or width direction of the main frame (91) for mounting a plurality of energy storage boxes (1).

4. The liquid phase change heat exchange device (101) according to claim 3, characterized in that: The mounting frame (92) is a skeleton-type structure and its internal contour is adapted to the shape of the energy storage box (1).

5. The liquid phase change heat exchange device (101) according to claim 1, characterized in that: A liquid level meter (2) is also provided on the top of the energy storage box (1), and the liquid level meter (2) is used to monitor the liquid level of the phase-change liquid (7) in the energy storage box (1).

6. The liquid phase change heat exchange device (101) according to claim 1, characterized in that: The water injection port (5) is also provided with a detachable cover (4), and the cover (4) is used to seal the energy storage box (1).

7. The liquid phase change heat exchange device (101) according to claim 6, characterized in that: The top of the energy storage box (1) is also provided with an exhaust valve (3) connected to the interior of the energy storage box (1), and the exhaust valve (3) is used to extract the gas inside the energy storage box (1) after the phase change liquid (7) is injected to make it a vacuum state.

8. The liquid phase change heat exchange device (101) according to claim 1, characterized in that: The top of the energy storage box (1) is also provided with a lifting ring (6).

9. The liquid phase change heat exchange device (101) according to claim 1, characterized in that: The water inlet (11) and the water outlet (12) are arranged on two opposite sides of the solution tank (8), and the water inlet (11) is close to the bottom of the accommodating cavity, and the water outlet (12) is close to the top of the accommodating cavity.

10. A modular liquid phase change heat storage and heat exchange system, characterized in that: The heat exchange device (101) comprises the heat exchange device (101) as claimed in any one of claims 1 to 9, as well as an energy storage chamber (102), a lifting device (103) and a heat pump unit (104), wherein the energy storage chamber (102) is arranged on one side of the heat exchange device (101), and the lifting device (103) is arranged above the heat exchange device (101) and the energy storage chamber (102) for transporting the energy storage box (1) back and forth between the energy storage chamber (102) and the heat exchange device (101), and the inlet end of the evaporator of the heat pump unit (104) is connected to the water inlet (11) through a pipeline, and the outlet end of the evaporator of the heat pump unit (104) is connected to the water outlet (12) through a pipeline.

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