Low-temperature phase change heat storage device

Abstract

The invention relates to a low-temperature phase change heat storage device, and belongs to the field of heat storage devices, the low-temperature phase change heat storage device comprises a box body and a heat storage module, the heat storage module is fixedly arranged in the box body, a medium channel is formed in the box body through the heat storage module, and a medium outlet hole and a medium inlet hole are formed in the box body; the medium outlet hole and the medium inlet hole are communicated with the two opposite ends of the medium channel respectively, the medium air pipe penetrates through the box body and is fixed relative to the box body, the track of the medium air pipe is arranged along the medium channel, and the medium air pipe is used for introducing air flow. The outer wall of the medium air pipe and the hole wall of the medium outlet hole are attached to the hole wall of the medium inlet hole, a gap is formed between the medium air pipe and the heat storage module, and the gap between the medium air pipe and the heat storage module is used for being filled with water. Water is adopted for conducting heat exchange on the medium gas pipe and the heat storage module, and the equipment cost is reduced on the premise that the heat exchange efficiency is higher.

Description

Technical Field

[0001] The present application relates to the field of heat storage devices, and in particular to a low-temperature phase change heat storage device. Background Art

[0002] Phase change thermal storage is a high-tech energy storage technology based on phase change energy storage materials. It is mainly divided into thermochemical heat storage, sensible heat storage and phase change heat storage. Thermal storage technology is an important technology to improve energy efficiency and protect the environment. It can be used to solve the contradiction between thermal energy supply and demand. It has broad application prospects in the fields of solar energy utilization, electricity "peak shifting and valley filling", waste heat and waste heat recovery, and energy saving in industrial and civil buildings and air conditioners.

[0003] In the related art, the heat storage device includes a box body, in which a phase change heat storage material is fixed, and a channel for the flow of heat exchange medium is also provided in the box body, and the channel space is in direct contact with the phase change heat storage material; there are two commonly used heat exchange media, namely water and air flow. For water, the required supporting equipment (such as a circulating water system) is relatively expensive, and for air flow, since the specific heat capacity of air is much lower than that of water, the heat exchange efficiency is not good. Summary of the invention

[0004] In order to improve the above problems, the present application provides a low-temperature phase change heat storage device.

[0005] The low-temperature phase change heat storage device provided in this application adopts the following technical solution: A low-temperature phase-change heat storage device comprises a box and a heat storage module, wherein the heat storage module is fixedly arranged in the box, a medium channel is formed in the box through the heat storage module, a medium outlet hole and a medium inlet hole are opened on the box, and the medium outlet hole and the medium inlet hole are respectively connected to the opposite ends of the medium channel, and further comprises a medium air pipe, wherein the medium air pipe passes through the box and is relatively fixed to the box, the trajectory of the medium air pipe is arranged along the medium channel, the medium air pipe is used to pass airflow, the outer wall of the medium air pipe is in contact with the hole wall of the medium outlet hole and the hole wall of the medium inlet hole, a gap is formed between the medium air pipe and the heat storage module, and the gap between the medium air pipe and the heat storage module is used to fill water.

[0006] By adopting the above technical solution, the medium air pipe is used for air flow, and the medium air pipe and the heat storage module are filled with water with large specific heat capacity and better thermal conductivity. When in use, the water can improve the heat exchange efficiency and effect between the medium air pipe and the heat storage module. At the same time, since the water in the box is not taken out and placed, the equipment cost requirement is relatively low.

[0007] Preferably, the heat storage module includes a plurality of fins, the fins of two adjacent heat storage modules are staggered, the medium channel is formed between two adjacent fins, a support plate is fixedly connected to the outer tube wall of the medium air pipe, and the edge of the support plate abuts the heat storage module.

[0008] By adopting the above technical solution, the presence of the support plate enables the middle part of the medium air pipe and the heat storage module to support each other, thereby reducing the vibration of the medium air pipe during operation and improving the structural stability of the medium air pipe and the fin plate.

[0009] Preferably, the support plate is provided with a flow hole, and the flow hole passes through the support plate in a thickness direction.

[0010] By adopting the above technical solution, the spaces on both sides of the support plate are connected through the flow holes, thereby improving the connectivity and mutual fluidity of water on both sides of the support plate.

[0011] Preferably, a water-repelling member is movably provided on the support plate, and a control component for movably moving the water-repelling member is provided on the support plate and / or the medium air pipe.

[0012] By adopting the above technical solution, the control component controls the water-displacing member to shake, disturbs the water in the medium channel, improves the fluidity of the water, promotes full contact between the water and the medium air pipe and the heat storage module, and improves the heat exchange efficiency and effect.

[0013] Preferably, the control assembly comprises a power turbine and a transmission structure, wherein the power turbine is coaxially rotatably connected to the medium air pipe, and the transmission structure is used to transmit the kinetic energy of the power turbine to the water-displacing member.

[0014] By adopting the above technical solution, when there is a directional airflow passing through the medium air pipe, the power turbine can rotate; the transmission structure is used to transmit the kinetic energy of the power turbine to the water-displacing member so that the water-displacing member can perform its own work.

[0015] Preferably, a running cavity is opened in the support plate, and the running cavity is connected with the flow hole and the inner cavity of the medium air pipe at the same time. The transfer structure is a connecting ring, and the connecting ring contacts the cavity wall of the running cavity. The connecting ring and the power turbine are coaxially fixedly connected. The water-displacing member is a fan plate, and the fan plates are provided in plurality and are fixedly connected to the outer edge of the connecting ring. When the connecting ring rotates, the fan plates pass through the flow hole.

[0016] By adopting the above technical solution, when the power turbine rotates under the action of airflow, each fan plate rotates synchronously. At the same time, the area swept by each fan plate passes through the flow hole, which can cause water flow at the flow hole and promote the water on both sides of the support plate to flow.

[0017] Preferably, the water-displacing member is a duck-foot plate, which is located at the flow hole and hinged to the support plate. The transmission structure includes a transmission rod, which is slidably connected to the support plate, and the sliding direction is perpendicular to the hinge axis of the duck-foot plate relative to the support plate. A control hole is opened on the duck-foot plate, and the transmission rod passes through the control hole. Two thrust blocks are fixedly connected to the transmission rod, and the two thrust blocks are respectively located on opposite sides of the duck-foot plate. A control member is provided between the transmission rod and the power turbine.

[0018] By adopting the above technical solution, the thrust block generates a reciprocating thrust on the duck foot plate, thereby causing the duck foot plate to swing once, thereby producing a directional shifting effect on the water flow.

[0019] Preferably, the control member is a swing rod, one end of which is fixedly connected to the side of the power turbine, and the other end is rotatably provided with a contact roller, the length direction and the rotation axis of the contact roller are parallel to the rotation axis of the power turbine, one end of the transmission rod is located in the medium air pipe, the side wall of the contact roller is in contact with the inner wall of the medium air pipe, and a matching spring is provided between the support plate and the transmission rod, and the extension and contraction direction of the matching spring is consistent with the sliding direction of the transmission rod.

[0020] By adopting the above technical solution, during the rotation of the power turbine, the swing rod and the contact roller rotate synchronously, and the contact roller repeatedly contacts the transmission rod, thereby pushing the transmission rod, and controlling the swing of the duck foot plate through the transmission rod.

[0021] Preferably, a circulation auxiliary channel is provided on the box body, and both ports of the circulation auxiliary channel are connected to the medium channel. One port of the circulation auxiliary channel is located near the medium outlet hole, and the other port is located near the medium inlet hole.

[0022] By adopting the above technical solution, the circulation auxiliary channel and the medium channel form a closed-loop water flow circuit inside the box, and the water in the box can circulate unidirectionally in this water flow circuit, further improving the adequacy of the contact between the water and the heat storage module and the medium air pipe.

[0023] Preferably, a pneumatic slide is provided on the box body, an adjusting piston is slidably provided in the pneumatic slide, a water flow channel is opened on the adjusting piston, one end of the pneumatic slide is connected to the medium air pipe, a return spring is provided in the pneumatic slide, one end of the return spring is connected to the box body, and the other end is connected to the adjusting piston, the air pressure in the medium air pipe and the return spring act on the adjusting piston to control the movement of the adjusting piston, and the movement of the adjusting piston controls whether the water flow channel and the circulation auxiliary channel are connected.

[0024] By adopting the above technical solution, when the device is not working, there is no airflow in the medium air pipe, the adjusting piston blocks the circulation auxiliary channel, the water in the water tank cannot flow easily, and the heat exchange between the heat storage module and the box body is reduced. When there is airflow in the medium air pipe and the air pressure is high, the adjusting piston can be pushed until the circulation auxiliary channel is opened and the water flow loop is formed.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the setting of the medium air pipe, the medium air pipe is used for air flow, and the space between the medium air pipe and the heat storage module is filled with water with large specific heat capacity and better thermal conductivity. When in use, the water can improve the heat exchange efficiency and effect between the medium air pipe and the heat storage module. At the same time, since the water in the box is not taken out and placed, the equipment cost requirement is relatively low; 2. Through the setting of flow holes, water diverting parts and circulation auxiliary channels, when the air pressure in the medium air pipe gradually increases, the regulating piston moves and conducts the circulation auxiliary channel. Combined with the activity of the water diverting parts, the water in the medium channel and the circulation auxiliary channel forms a circulating water flow, which improves the fluidity of the water in the box and further improves the efficiency and effect of heat exchange of water with the medium air pipe and the heat storage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the low-temperature phase change heat storage device used in Example 1 of the present application.

[0027] Figure 2 It is a schematic cross-sectional view of the structure of the low-temperature phase change heat storage device in the first embodiment of the present application.

[0028] Figure 3 It is a schematic cross-sectional view of the structure of the control assembly and the water diverter in the first embodiment of the present application.

[0029] Figure 4 It is a schematic diagram used to reflect the internal structure of the operating chamber in Example 1 of the present application.

[0030] Figure 5 It is a cross-sectional schematic diagram used to illustrate the working principle of the regulating piston in the first embodiment of the present application.

[0031] Figure 6 It is a schematic cross-sectional view of the structure of the control assembly and the water diverter in the second embodiment of the present application.

[0032] Figure 7 It is a structural diagram used to reflect the control component in Example 2 of the present application.

[0033] Explanation of the accompanying drawings: 1. Box body; 11. Circulation auxiliary channel; 12. Adjusting piston; 121. Water flow channel; 13. Medium inlet hole; 14. Medium outlet hole; 15. Reset spring; 16. Pneumatic slide; 17. Hard insulation board; 2. Heat storage module; 21. Fin plate; 22. Medium channel; 3. Medium air pipe; 31. Support plate; 311. Flow hole; 312. Operating chamber; 32. Water-displacing member; 321. Control hole; 4. Control assembly; 41. Power turbine; 42. Transmission structure; 421. Connecting ring; 422. Transmission rod; 4221. Thrust block; 423. Matching spring; 424. Throwing rod; 425. Contact roller. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-7 This application is described in further detail.

[0035] Embodiment 1: The present application embodiment discloses a low temperature phase change heat storage device, such as Figure 1 and 2 As shown, it includes a box body 1, a heat storage module 2 and a medium air pipe 3. The heat storage module 2 is arranged in the box body 1; the medium air pipe 3 is fixedly connected to the box body 1. A medium channel 22 is formed in the box body 1 through the spatial shape of the heat storage module 2. The medium air pipe 3 passes through the box body 1 along the trajectory of the medium channel 22. The medium air pipe 3 is used for heat exchange gas circulation. A hard heat insulation board 17 is fixedly connected to the inner wall of the box body 1, and the heat storage module 2 is fixedly connected to the side of the hard heat insulation board 17 away from the box body 1. like Figure 1 and 2 As shown, the box body 1 is provided with a medium outlet hole 14 and a medium inlet hole 13, and the medium outlet hole 14 and the medium inlet hole 13 are respectively connected to the opposite ends of the medium channel 22, and the outer wall of the medium air pipe 3 and the hole wall of the medium outlet hole 14 are in contact with the hole wall of the medium inlet hole 13, and a gap is formed between the medium air pipe 3 and the heat storage module 2, that is, a relatively closed space is formed between the medium air pipe 3 and the heat storage module 2, and the space is filled with water. In this embodiment, the number of heat storage modules 2 in a single box body 1 is two, and the heat storage module 2 is in a comb-tooth shape, which includes a plurality of fin plates 21, and the medium channel 22 is formed by the fin plates 21 of the two heat storage modules 2 interlaced with each other, so the trajectory of the medium channel 22 and the medium air pipe 3 is serpentine. A support plate 31 is fixedly connected to the outer tube wall of the straight segment of the medium air pipe 3, and the edge of the support plate 31 is in contact with the heat storage module 2; the existence of the support plate 31 enables the middle part of the medium air pipe 3 and the heat storage module 2 to support each other, thereby reducing the vibration of the medium air pipe 3 during operation and improving the structural stability of the medium air pipe 3 and the fin plate 21.

[0036] like Figure 1 , 3As shown in FIG. 4 , the plate surface of the support plate 31 is perpendicular to the length direction of the medium air pipe 3, and a flow hole 311 is provided on the support plate 31. The flow hole 311 runs through the thickness direction of the support plate 31, and the spaces on both sides of the support plate 31 are connected through the flow hole 311, thereby improving the connectivity of water on both sides of the support plate 31. At the same time, a circulation auxiliary channel 11 is provided on the box body 1, and both ports of the circulation auxiliary channel 11 are connected to the medium channel 22, one of the ports of the circulation auxiliary channel 11 is located near the medium outlet hole 14, and the other port is located near the medium inlet hole 13, that is, the circulation auxiliary channel 11 and the medium channel 22 form a closed-loop water flow circuit inside the box body 1. A water-repelling member 32 is movably provided on the support plate 31, and a control component 4 for moving the water-repelling member 32 is provided on the support plate 31 and the medium air pipe 3. When air flow is introduced into the medium air pipe 3, the control component 4 controls the water-repelling member 32 to shake, thereby disturbing the water in the medium channel 22, improving the fluidity of the water, and promoting full contact between the water and the medium air pipe 3 and the heat storage module 2.

[0037] like Figure 3 and 4 As shown, the control component 4 includes a power turbine 41 and a transmission structure 42. The power turbine 41 is coaxially connected to the medium air pipe 3. When there is a directional airflow passing through the medium air pipe 3, the power turbine 41 can rotate; the transmission structure 42 is used to transfer the kinetic energy of the power turbine 41 to the water-displacing member 32. In this embodiment, the transmission structure 42 is a connecting ring 421, the water-displacing member 32 is a fan plate, and a running cavity 312 is opened in the support plate 31. The running cavity 312 is connected to the flow hole 311 and the inner cavity of the medium air pipe 3 at the same time. The inner edge of the connecting ring 421 is coaxially fixedly connected to the power turbine 41, and the two end surfaces of the connecting ring 421 are in contact with the relative cavity walls of the running cavity 312, so that the flow hole 311 will not be connected to the inner cavity of the medium air pipe 3. There are multiple fan plates, all of which are fixedly connected to the outer edge of the connecting ring 421. The multiple fan plates are arranged in an array along the outer edge of the connecting ring 421. The power turbine 41 rotates to carry the connecting ring 421 and each fan plate to rotate synchronously. When the connecting ring 421 rotates, the area swept by each fan plate passes through the flow hole 311. The plate surface of the fan plate is relatively inclined. When the fan plate sweeps through the flow hole 311, it can cause the water to flow along the flow hole 311, and the flow direction of the water is opposite to the direction of the air flow in the medium air pipe 3.

[0038] like Figure 1 , 2As shown in Figure 5, a pneumatic slide 16 is provided on the box body 1, and an adjusting piston 12 is slidably provided in the pneumatic slide 16. A water flow channel 121 is opened on the adjusting piston 12. The middle part of the pneumatic slide 16 is connected to the middle part of the circulation auxiliary channel 11. During the sliding process of the adjusting piston 12, the circulation auxiliary channel 11 can be blocked by itself, and the circulation auxiliary channel 11 can also be opened through the water flow channel 121. One end of the pneumatic slide 16 is connected to the medium air pipe 3, and a return spring 15 is provided in the pneumatic slide 16. The return spring 15 is located at the end of the pneumatic slide 16 away from the medium air pipe 3. One end of the return spring 15 is fixedly connected to the box body 1, and the other end is fixedly connected to the adjusting piston 12. At this time, the air pressure in the medium air pipe 3 and the combined force of the return spring 15 on the adjusting piston 12 control the movement of the adjusting piston 12. In the natural state where there is no airflow in the medium air pipe 3, the adjusting piston 12 is in a position to block the circulation auxiliary channel 11; when the air pressure in the medium air pipe 3 gradually increases, the thrust of the air pressure on the adjusting piston 12 pushes the adjusting piston 12 to move, and finally the water flow channel 121 and the circulation auxiliary channel 11 overlap. At this time, the circulation auxiliary channel 11 is connected as a whole, which can provide a circulation flow path for the water in the medium channel 22.

[0039] Embodiment 2: like Figure 6 and 7As shown, the difference from the above embodiment is that in this embodiment, the support plate 31 does not have an operating chamber 312, and the water-diverting member 32 is a duck-foot plate. The number of the duck-foot plates is consistent with the number of the flow holes 311 and the two correspond one to one. A single duck-foot plate is located at a flow hole 311 and is hinged to the support plate 31, and the hinge axis is parallel to the plate surface of the support plate 31; the transmission structure 42 includes a transmission rod 422 and a swing rod 424, the transmission rod 422 and the support plate 31 are slidably connected, and the sliding direction is the radial direction of the medium air pipe 3 and is perpendicular to the hinge axis of the duck-foot plate relative to the support plate 31. The swing rod 424 is made of memory titanium alloy, one end of which is fixedly connected to the side of the power turbine 41, and the other end is rotatably provided with a contact roller 425, the length direction and the rotation axis of the contact roller 425 are parallel to the rotation axis of the power turbine 41; the circumference of the contact roller 425 contacts the inner wall of the medium air pipe 3, when the power turbine 41 rotates, the swing rod 424 carries the contact roller 425 to rotate synchronously, and the roller surface of the contact roller 425 rolls and abuts against the inner wall of the medium air pipe 3. A matching spring 423 is fixedly connected between the end of the transmission rod 422 away from the axis of the medium air pipe 3 and the support plate 31, and the expansion and contraction direction of the matching spring 423 is parallel to the length direction of the transmission rod 422; the other end of the transmission rod 422 extends into the medium air pipe 3, and as the contact roller 425 rotates, when the contact roller 425 passes the transmission rod 422, a thrust is generated on the transmission rod 422, so that the transmission rod 422 moves, and under the cooperation of the matching spring 423, the transmission rod 422 reciprocates. The duck-foot plate is provided with a control hole 321, through which a transmission rod 422 passes, and two thrust blocks 4221 are fixedly connected to the transmission rod 422, and the two thrust blocks 4221 are respectively located on opposite sides of the duck-foot plate. When the transmission rod 422 reciprocates, the thrust blocks 4221 generate a reciprocating thrust on the duck-foot plate, thereby causing the duck-foot plate to swing once, and generating a directional shifting effect on the water flow.

[0040] The implementation principle of a low-temperature phase change heat storage device in the embodiment of the present application is: During heat exchange, a unidirectional airflow is introduced into the medium air pipe 3, and the direction of the airflow is from the medium inlet hole 13 to the medium outlet hole 14. The airflow drives the power turbine 41. The rotation of the power turbine 41 causes the water-repelling member 32 to move, thereby disturbing the water in the medium channel 22, improving the fluidity of the water, and thus improving the heat exchange efficiency and effect. For the two forms of the water-repelling member 32 and the control component 4, the control component 4 in the first embodiment has a simple structure and high power efficiency, but due to the existence of the operating chamber 312, the air tightness of the medium air pipe 3 is relatively low, and water leakage is prone to occur in the medium air pipe 3 after long-term use. The control component 4 in the second embodiment has a relatively more complex structure. Since one of the steps in the power transmission process is impact force transmission, the energy transmission efficiency is low, but the operation of each water-repelling member 32 is relatively independent, and the medium air pipe 3 has better air tightness and a longer service life.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low-temperature phase-change heat storage device, comprising a housing (1) and a heat storage module (2), wherein the heat storage module (2) is fixedly arranged in the housing (1), a medium channel (22) is formed in the housing (1) through the heat storage module (2), a medium outlet hole (14) and a medium inlet hole (13) are provided on the housing (1), and the medium outlet hole (14) and the medium inlet hole (13) are respectively connected to opposite ends of the medium channel (22), characterized in that: The heat storage module (2) further comprises a medium air pipe (3), the medium air pipe (3) passing through the box body (1) and being relatively fixed to the box body (1), the trajectory of the medium air pipe (3) being arranged along the medium channel (22), the medium air pipe (3) being used for introducing airflow, the outer wall of the medium air pipe (3) being in contact with the hole wall of the medium outlet hole (14) and the hole wall of the medium inlet hole (13), a gap being formed between the medium air pipe (3) and the heat storage module (2), and the gap between the medium air pipe (3) and the heat storage module (2) being used for filling water.

2. A low-temperature phase change heat storage device according to claim 1, characterized in that: The heat storage module (2) comprises a plurality of fin plates (21), the fin plates (21) of two adjacent heat storage modules (2) are interlaced, the medium channel (22) is formed between two adjacent fin plates (21), a support plate (31) is fixedly connected to the outer tube wall of the medium air pipe (3), and the edge of the support plate (31) is in contact with the heat storage module (2).

3. A low-temperature phase change heat storage device according to claim 2, characterized in that: The support plate (31) is provided with a flow hole (311), and the flow hole (311) runs through the support plate (31) in the thickness direction.

4. A low-temperature phase change heat storage device according to claim 3, characterized in that: A water-displacing member (32) is movably provided on the support plate (31), and a control component (4) for making the water-displacing member (32) movable is provided on the support plate (31) and / or the medium air pipe (3).

5. A low-temperature phase-change heat storage device according to claim 4, characterized in that: The control component (4) comprises a power turbine (41) and a transmission structure (42); the power turbine (41) is coaxially rotatably connected to the medium air pipe (3); and the transmission structure (42) is used to transmit the kinetic energy of the power turbine (41) to the water-displacing member (32).

6. A low-temperature phase change heat storage device according to claim 5, characterized in that: The support plate (31) is provided with an operating chamber (312), the operating chamber (312) is communicated with the flow hole (311) and the inner chamber of the medium air pipe (3) at the same time, the transfer structure (42) is a connecting ring (421), the connecting ring (421) is in contact with the chamber wall of the operating chamber (312), the connecting ring (421) and the power turbine (41) are coaxially fixedly connected, the water-displacing member (32) is a fan plate, a plurality of the fan plates are provided and are fixedly connected to the outer edge of the connecting ring (421), and when the connecting ring (421) rotates, the fan plates pass through the flow hole (311).

7. A low-temperature phase change heat storage device according to claim 5, characterized in that: The water-displacing member (32) is a duck-foot plate, which is located at the flow hole (311) and hinged to the support plate (31). The transmission structure (42) includes a transmission rod (422), which is slidably connected to the support plate (31), and the sliding direction is perpendicular to the hinge axis of the duck-foot plate relative to the support plate (31). A control hole (321) is opened on the duck-foot plate, and the transmission rod (422) passes through the control hole (321). Two thrust blocks (4221) are fixedly connected to the transmission rod (422), and the two thrust blocks (4221) are respectively located on opposite sides of the duck-foot plate. A control member is provided between the transmission rod (422) and the power turbine (41).

8. A low-temperature phase-change heat storage device according to claim 7, characterized in that: The control component is a swing rod (424), one end of which is fixedly connected to the side of the power turbine (41), and the other end of which is rotatably provided with a contact roller (425), the length direction and the rotation axis of the contact roller (425) are both parallel to the rotation axis of the power turbine (41), one end of the transmission rod (422) is located in the medium air pipe (3), the side wall of the contact roller (425) is in contact with the inner wall of the medium air pipe (3), and a matching spring (423) is provided between the support plate (31) and the transmission rod (422), and the extension direction of the matching spring (423) is consistent with the sliding direction of the transmission rod (422).

9. A low-temperature phase change heat storage device according to any one of claims 4 to 8, characterized in that: The box body (1) is provided with a circulation auxiliary channel (11), both ports of the circulation auxiliary channel (11) are in communication with the medium channel (22), one port of the circulation auxiliary channel (11) is located near the medium outlet hole (14), and the other port is located near the medium inlet hole (13).

10. A low-temperature phase-change heat storage device according to claim 9, characterized in that: The box body (1) is provided with a pneumatic slideway (16), an adjusting piston (12) is slidably arranged in the pneumatic slideway (16), a water flow channel (121) is provided in the adjusting piston (12), one end of the pneumatic slideway (16) is connected to the medium air pipe (3), a return spring (15) is provided in the pneumatic slideway (16), one end of the return spring (15) is connected to the box body (1), and the other end is connected to the adjusting piston (12), the combined force of the air pressure in the medium air pipe (3) and the return spring (15) on the adjusting piston (12) controls the movement of the adjusting piston (12), and the movement of the adjusting piston (12) controls whether the water flow channel (121) and the circulation auxiliary channel (11) are connected.

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