Phase change heat exchanger and solar phase change energy storage heat exchange system

Abstract

The utility model discloses a phase change heat exchanger and a solar phase change energy storage heat exchange system. The phase change heat exchanger comprises a supporting frame and a heat transfer pipe, the supporting frame comprises at least two connecting bases, a first supporting column assembly, a second supporting column assembly and a third supporting column assembly, and the first supporting column assembly, the second supporting column assembly and the third supporting column assembly are all connected to the connecting bases; the first strut assembly, the second strut assembly and the third strut assembly are concentrically arranged, and the outline inner diameters of the first strut assembly, the second strut assembly and the third strut assembly are sequentially reduced; the heat transfer pipe comprises a first coil pipe, a second coil pipe and a third coil pipe, the first supporting column assembly is spirally sleeved with the first coil pipe, the second supporting column assembly is spirally sleeved with the second coil pipe, the third supporting column assembly is spirally sleeved with the third coil pipe, and the first coil pipe, the second coil pipe and the third coil pipe are sequentially communicated. The solar phase change energy storage heat exchange system comprises the phase change heat exchanger.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and in particular to a phase change heat exchanger and a solar energy phase change energy storage heat exchange system. Background Art

[0002] Energy storage technology can effectively solve the mismatch problem between the energy supply end and the energy consumption end in terms of time and quantity. Phase change energy storage has the advantages of high energy storage density and stable heating temperature. Common energy storage devices are straight tube type and spiral coil type. The spiral coil is a compact heat exchange tube. The fluid continuously changes direction as it flows forward in the spiral pipe, generating secondary circulation in the section perpendicular to the axial mainstream direction, which enhances the mixing of the fluid. Compared with straight tubes, the heat transfer coefficient of the fluid in the spiral coil is higher.

[0003] In the prior art, on the one hand, most coil heat exchangers have a compact structure and insufficient heat extraction space; on the other hand, single-layer coil heat exchangers have the problem of uneven temperature distribution inside the heat storage device; furthermore, coil heat exchangers are mostly connected in series, and there is a problem that the interface has been damaged during use; finally, when the existing coil heat exchangers use water source heat pumps and air source heat pump technologies to heat buildings, there will be problems such as large demand for water sources and easy frost in cold areas. Utility Model Content

[0004] The purpose of the utility model is to provide a phase change heat exchanger and a solar phase change energy storage and heat exchange system to solve the problem mentioned in the above background technology that the compact structure causes insufficient heat extraction space and thus leads to low phase change heat exchange efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A phase change heat exchanger, comprising:

[0007] A support frame, the support frame comprises at least two connecting seats, a first support assembly, a second support assembly and a third support assembly, the first support assembly, the second support assembly and the third support assembly are all connected to each of the connecting seats, the first support assembly, the second support assembly and the third support assembly are concentrically arranged, and the inner diameters of the first support assembly, the second support assembly and the third support assembly are successively reduced, so that a gap is formed between the first support assembly and the second support assembly, and between the second support assembly and the third support assembly;

[0008] A heat transfer tube, the heat transfer tube comprising a first coil, a second coil and a third coil, the first coil is spirally sleeved on the first support assembly, the second coil is spirally sleeved on the second support assembly, the third coil is spirally sleeved on the third support assembly, and the first coil, the second coil and the third coil are sequentially connected, so that the free end of the first coil forms a first coil port, and the free end of the third coil forms a second coil port;

[0009] The gap is used to accommodate phase-change liquid, and the circulating medium flows in from the first coil port, flows through the first coil, the second coil and the third coil in sequence, and then flows out from the second coil port. The circulating medium exchanges heat with the phase-change liquid through the tube wall of the heat transfer tube.

[0010] Optionally, the connecting seat includes a flange and a plurality of ribs, wherein the ribs are arranged on the circumference of the flange and extend radially along the flange, the first pillar assembly is connected to the flange, and the second pillar assembly and the second pillar assembly are both connected to each of the ribs.

[0011] Optionally, the first pillar assembly includes multiple first pillars, the second pillar assembly includes multiple second pillars, and the third pillar assembly includes multiple third pillars, each of the first pillars is connected to the same flange, and a single second pillar and third pillar are connected to the same rib in sequence along the radial direction of the flange.

[0012] Optionally, it also includes multiple first through holes, second through holes and third through holes, multiple first through holes are arranged on the circumference of the flange, a single second through hole and the third through hole are distributed in sequence on the same rib along the radial direction of the flange, the first pillars are all passed through the first through holes of each coaxial, the second pillars are all passed through the second through holes of each coaxial, and the third pillars are all passed through the third through holes of each coaxial.

[0013] Optionally, the first coil, the second coil and the third coil are the same heat transfer tube.

[0014] Optionally, a gap is provided between each coil of the first coil, the second coil and the third coil.

[0015] Optionally, one end of the second coil is connected to an end of the first coil away from the first coil opening, and the other end of the second coil is connected to an end of the third coil away from the second coil opening.

[0016] Optionally, the heat transfer tube also includes a straight tube, which is arranged at the free end of the third coil, and the free end of the straight tube is provided with the second coil port. The connecting seat is provided with an inner diameter hole, and the straight tube is passed through each of the inner diameter holes so that the first coil port and the second coil port are located on one side of the same connecting seat.

[0017] A solar phase-change energy storage and heat exchange system comprises the phase-change heat exchanger provided by any one of the above embodiments, as well as an energy storage water tank, a water distributor, a water collector, a heat pump unit, a water pump and a solar photovoltaic thermal collector, wherein the energy storage water tank is provided with an open receiving cavity for storing phase-change liquid, the phase-change heat exchanger is arranged in the receiving cavity, the first coil port is connected to the water distributor, the second coil port is connected to the water collector, the liquid outlet of the heat pump unit is connected to the liquid inlet of the water pump, the liquid outlet of the water pump is connected to the water distributor, the liquid inlet of the heat pump unit is connected to the water collector, the liquid outlet of the solar photovoltaic thermal collector is connected to the water collector, and the liquid inlet of the solar photovoltaic thermal collector is connected to the water distributor.

[0018] Optionally, it also includes pipes and valves, and the pipes and valves are provided between the water distributor, the water collector, the heat pump unit, the water pump and the solar photovoltaic thermal collector for connection.

[0019] The beneficial effects of the utility model are:

[0020] The phase change heat exchanger of the utility model solves the technical problems in the prior art such as the compact structure resulting in insufficient heat extraction space and thus low phase change heat extraction efficiency, uneven internal temperature distribution, and easy damage to the coil interface during use, and achieves beneficial effects: the phase change heat exchanger is a vertical heat exchanger through the combination of a support frame and a coil, and a gap is left on the outer wall of the coil to have a larger space, which can maximize the extraction of phase change latent heat. At the same time, the large density of phase change latent heat can be used to extract more heat using a smaller water tank; secondly, the use of a multi-layer structure can solve the problem of uneven temperature distribution in the device; thirdly, the spiral arrangement of a heat transfer tube has no joints in the middle, thereby extending the service life of the heat exchanger.

[0021] The solar phase-change energy storage and heat exchange system of the utility model solves the problems in the prior art of large water demand when using water source heat pumps and air source heat pump technologies to heat buildings and easy frost on air source heat pumps in cold areas. The solar phase-change energy storage and heat exchange system uses phase-change heat transfer and solar energy coupling. On the one hand, it effectively solves the drawbacks of large water volume required for water source heat pump systems and unstable operation of air source heat pump systems in severe cold areas; on the other hand, it uses the waste heat of the solar backplane to melt ice and store heat during the day to reduce the extra energy consumption generated by melting ice, and uses the phase-change latent heat to provide heat for the water source heat pump at night, thereby reducing the working temperature of the solar panel and thus improving the power generation efficiency of the solar panel, extending the working time of the solar panel, improving the comprehensive utilization rate of solar energy, and better achieving the goal of building energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative 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.

[0023] Figure 1 It is a schematic diagram of the overall structure of a phase change heat exchanger provided according to an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 A view from the middle;

[0025] Figure 3 yes Figure 1 The view from the middle B direction;

[0026] Figure 4 It is a structural schematic diagram of a support frame of a phase change heat exchanger provided according to an embodiment of the utility model;

[0027] Figure 5 It is an assembly diagram of a first coil and a support frame of a phase change heat exchanger provided according to an embodiment of the utility model;

[0028] Figure 6 It is an assembly diagram of a second coil and a support frame of a phase change heat exchanger provided according to an embodiment of the utility model;

[0029] Figure 7 It is an assembly diagram of a third coil and a support frame of a phase change heat exchanger provided according to an embodiment of the utility model;

[0030] Figure 8 is a process schematic diagram of a solar energy phase change energy storage and heat exchange system provided according to another embodiment of the utility model;

[0031] Among them, 1, support frame; 2, heat transfer tube; 11, connecting seat; 12, first pillar assembly; 13, second pillar assembly; 14, third pillar assembly; 21, first coil; 22, second coil; 23, third coil; 24, straight pipe; 111, flange; 112, rib; 113, first through hole; 114, second through hole; 115, third through hole; 116, inner diameter hole; 121, first pillar; 13 1. Second pillar; 141. Third pillar; 211. First coil port; 231. Second coil port; 101. Phase change heat exchanger; 102. Energy storage water tank; 103. Water distributor; 104. Water collector; 105. Heat pump unit; 106. Water pump; 107. Solar photovoltaic thermal collector; 108. Pipeline; 109. Valve; 1010. Inverter; 1011. Energy storage battery; 1012. Electricity user. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] Below, refer to Figure 1-8 A phase change heat exchanger and a solar energy phase change energy storage and heat exchange system according to an embodiment of the utility model are described in detail.

[0035] The first embodiment of the present invention provides a phase change heat exchanger 101 .

[0036] like Figure 1-7As shown, a phase change heat exchanger 101 includes a support frame 1 and a heat transfer tube 2, wherein the support frame 1 includes at least two connecting seats 11, a first support assembly 12, a second support assembly 13 and a third support assembly 14, wherein the first support assembly 12, the second support assembly 13 and the third support assembly 14 are connected to each of the connecting seats 11, the first support assembly 12, the second support assembly 13 and the third support assembly 14 are concentrically arranged and the inner diameters of the first support assembly 12, the second support assembly 13 and the third support assembly 14 are successively reduced, so that gaps are formed between the first support assembly 12 and the second support assembly 13, and between the second support assembly 13 and the third support assembly 14; the heat transfer tube 2 includes a first coil 21, a second coil 21, and a second coil 22. 22 and a third coil 23, the first coil 21 is spirally sleeved on the first pillar assembly 12, the second coil 22 is spirally sleeved on the second pillar assembly 13, and the third coil 23 is spirally sleeved on the third pillar assembly 14, and the first coil 21, the second coil 22 and the third coil 23 are connected in sequence, so that the free end of the first coil 21 forms a first coil port 211, and the free end of the third coil 23 forms a second coil port 231; wherein the gap is used to accommodate a phase-change liquid, and a circulating medium flows in from the first coil port 211, flows through the first coil 21, the second coil 22 and the third coil 23 in sequence, and then flows out from the second coil port 231, and the circulating medium exchanges heat with the phase-change liquid through the tube wall of the heat transfer tube 2.

[0037] It should be noted that the circulating medium can be a circulating medium with a low freezing point; the phase change liquid can be water. In this embodiment, it is preferred to take the freezing of water as an example for explanation. Thus, through the support frame 1, the phase change heat exchanger 101 is a vertical heat exchanger; through the gaps between the first support assembly 12, the second support assembly 13 and the third support assembly 14, the outer walls of the first coil 21, the second coil 22 and the third coil 23 are all left with gaps, thereby having a larger ice formation space, and the phase change latent heat can be extracted to the maximum extent; through the characteristics of the large density of the phase change latent heat, more heat can be extracted using a smaller volume of water tank; the multi-layer structure of the first coil 21, the second coil 22 and the third coil 23 can solve the problem of uneven temperature distribution in the device.

[0038] like Figure 2-3As shown, in one embodiment, in order to facilitate the installation and disassembly of the first pillar assembly 12, the second pillar assembly 13 and the third pillar assembly 14 and to make them more stable after installation, the connecting seat 11 includes a flange 111 and a plurality of ribs 112, and the ribs 112 are all arranged on the circumference of the flange 111 along the radial extension of the flange 111, the first pillar assembly 12 is connected to the flange 111, and the second pillar assembly 13 and the third pillar assembly 14 are all connected to each of the ribs 112.

[0039] like Figure 4 As shown, in one embodiment, the first support assembly 12 includes a plurality of first supports 121, the second support assembly 13 includes a plurality of second supports 131, and the third support assembly 14 includes a plurality of third supports 141, each of the first supports 121 is connected to the same flange 111, and a single second support 131 and the third support 141 are sequentially connected to the same rib 112 along the radial direction of the flange 111. It should be noted that the support frame 1 is actually a skeleton structure, thereby reducing the production cost of the support frame 1 while leaving a larger gap on the outer wall of the first coil 21, the second coil 22 and the third coil 23, thereby having a larger ice forming space.

[0040] In one embodiment, it further comprises a plurality of first through holes 113, a second through hole 114 and a third through hole 115, wherein the plurality of first through holes 113 are all arranged on the circumference of the flange 111, and the single second through hole 114 and the third through hole 115 are sequentially distributed on the same rib 112 along the radial direction of the flange 111, and the first pillar 121 is penetrated in each coaxial first through hole 113, the second pillar 131 is penetrated in each coaxial second through hole 114, and the third pillar 141 is penetrated in each coaxial third through hole 115. Thus, the first pillar 121, the second pillar 131 and the third pillar 141 can be conveniently installed, reducing installation time and production cost.

[0041] like Figure 5-7 As shown, in one embodiment, the first coil 21, the second coil 22 and the third coil 23 are the same heat transfer tube 2. Therefore, there is no joint between the first coil 21, the second coil 22 and the third coil 23, thereby avoiding the problem of heat exchanger damage caused by joint damage, thereby extending the service life of the heat exchanger.

[0042] In one embodiment, gaps are provided between each coil of the first coil 21, the second coil 22 and the third coil 23. Thus, a larger ice forming space can be provided, the phase change potential can be extracted to the maximum extent, and the energy utilization rate can be improved.

[0043] In one embodiment, one end of the second coil 22 is connected to one end of the first coil 21 away from the first coil port 211, and the other end of the second coil 22 is connected to one end of the third coil 23 away from the second coil port 231. It should be noted that in this embodiment, the circulating medium flows into one end of the first coil 21 from the first coil port 211, flows along the pipe 108 of the first coil 21 to the other end of the first coil 21, and then enters one end of the second coil 22, flows along the pipe 108 of the second coil 22 to the other end of the second coil 22, and then enters one end of the third coil 23, flows along the pipe 108 of the third coil 23 to the other end of the third coil 23, and then flows out from the second coil port 231, thereby maximizing the use of the heat exchange area of ​​the heat transfer tube 2 and improving the heat exchange efficiency between the circulating medium and the phase change liquid.

[0044] In one embodiment, the heat transfer tube 2 further includes a straight tube 24, which is disposed at the free end of the third coil 23, and the free end of the straight tube 24 is provided with the second coil port 231, and the connecting seat 11 is provided with an inner diameter hole 116, and the straight tube 24 is passed through each of the inner diameter holes 116 so that the first coil port 211 and the second coil port 231 are located on one side of the same connecting seat 11. Thus, the phase change heat exchanger 101 can be a vertical structure with a small footprint and convenient installation and maintenance; when applied to a water tank, the first coil port 211 and the second coil port 231 can be placed on the liquid level at the same time, thereby avoiding mixing of the phase change liquid and the circulating medium due to damage to the interface.

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

[0046] like Figure 8As shown, a solar phase change energy storage and heat exchange system comprises the phase change heat exchanger 101 provided in any one of the above embodiments, as well as an energy storage water tank 102, a water distributor 103, a water collector 104, a heat pump unit 105, a water pump 106 and a solar photovoltaic thermal collector 107. The energy storage water tank 102 is provided with an open receiving cavity for storing phase change liquid. The phase change heat exchanger 101 is arranged in the receiving cavity. The first coil port 211 is connected to the water distributor 103. The second coil port 231 is connected to the water collector 104, the liquid outlet of the heat pump unit 105 is connected to the liquid inlet of the water pump 106, the liquid outlet of the water pump 106 is connected to the water distributor 103, the liquid inlet of the heat pump unit 105 is connected to the water collector 104, the liquid outlet of the solar photovoltaic thermal collector 107 is connected to the water collector 104, and the liquid inlet of the solar photovoltaic thermal collector 107 is connected to the water distributor 103.

[0047] It should be noted that the phase change liquid can be water. In this embodiment, taking water as an example, during the day, the solar photovoltaic thermal collector 107 supplies power to the electricity user 1012 through the inverter 1010 and the energy storage battery 1011. The circulating medium absorbs heat from the solar photovoltaic thermal collector 107 and flows through the liquid outlet of the solar photovoltaic thermal collector 107 to the water collector 104 and then enters the phase change heat exchanger 101. The circulating medium undergoes phase change heat exchange with the ice in the energy storage water tank 102, thereby melting the ice in the energy storage water tank 102 and storing heat. The circulating medium then passes through the water distribution tank 101 to transfer heat to the water distribution tank 101. The circulating medium releases heat from the heat pump unit 105 and then flows to the water pump 106 through the liquid outlet of the heat pump unit 105, and then flows to the water distributor 103 through the water pump 106 and then enters the phase change heat exchanger 101. The circulating medium exchanges heat with the water in the energy storage water tank 102, so that the water in the energy storage water tank 102 freezes and releases the phase change latent heat. After absorbing the phase change latent heat, the circulating medium flows into the heat pump unit 105 through the water collector 104 to complete the heat exchange cycle.

[0048] Therefore, the solar phase change energy storage and heat exchange system adopts phase change heat transfer and solar energy coupling. On the one hand, it effectively solves the disadvantages of large water volume required for water source heat pump system and inability of air source heat pump system to melt ice in cold areas; on the other hand, during the day, the solar photovoltaic thermal collector 107 is used to melt ice and store heat using the waste heat of the solar back panel to reduce the extra energy consumption generated by ice melting, and at night, the phase change latent heat is used to provide heat source for the water source heat pump, which reduces the working temperature of the solar panel and thus improves the power generation efficiency of the solar panel, extends the working time of the solar panel, improves the comprehensive utilization rate of solar energy, and better achieves the purpose of building energy saving.

[0049] In one embodiment, it further includes a pipe 108 and a valve 109, and the pipe 108 and the valve 109 are provided between the water distributor 103, the water collector 104, the heat pump unit 105, the water pump 106 and the solar photovoltaic thermal collector 107 for connection. Thus, when installing the system, it can be installed according to local conditions, avoiding installation inconvenience caused by the environment, affecting the effect of the system, and reducing the actual utilization.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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 phase change heat exchanger, characterized in that: include: A support frame (1), the support frame (1) comprising at least two connecting seats (11), a first support assembly (12), a second support assembly (13) and a third support assembly (14), wherein the first support assembly (12), the second support assembly (13) and the third support assembly (14) are connected to each of the connecting seats (11), the first support assembly (12), the second support assembly (13) and the third support assembly (14) are concentrically arranged and the inner diameters of the first support assembly (12), the second support assembly (13) and the third support assembly (14) are successively reduced, so that a gap is formed between the first support assembly (12) and the second support assembly (13), and between the second support assembly (13) and the third support assembly (14); A heat transfer tube (2), the heat transfer tube (2) comprising a first coil (21), a second coil (22) and a third coil (23), the first coil (21) being spirally sleeved on the first support assembly (12), the second coil (22) being spirally sleeved on the second support assembly (13), the third coil (23) being spirally sleeved on the third support assembly (14), and the first coil (21), the second coil (22) and the third coil (23) being sequentially connected, so that the free end of the first coil (21) forms a first coil opening (211), and the free end of the third coil (23) forms a second coil opening (231); The gap is used to accommodate a phase-change liquid, and a circulating medium flows in from the first coil port (211), flows through the first coil (21), the second coil (22), and the third coil (23) in sequence, and then flows out from the second coil port (231), and the circulating medium exchanges heat with the phase-change liquid through the tube wall of the heat transfer tube (2).

2. The phase change heat exchanger according to claim 1, characterized in that: The connecting seat (11) comprises a flange (111) and a plurality of ribs (112), wherein the ribs (112) are arranged on the circumference of the flange (111) along a radial extension of the flange (111), the first support assembly (12) is connected to the flange (111), and the second support assembly (13) and the third support assembly (14) are connected to each of the ribs (112).

3. The phase change heat exchanger according to claim 2, characterized in that: The first pillar assembly (12) includes a plurality of first pillars (121), the second pillar assembly (13) includes a plurality of second pillars (131), and the third pillar assembly (14) includes a plurality of third pillars (141), each of the first pillars (121) is connected to the same flange (111), and a single second pillar (131) and a single third pillar (141) are sequentially connected to the same rib (112) along the radial direction of the flange (111).

4. The phase change heat exchanger according to claim 3, characterized in that: The rib (112) further comprises a plurality of first through holes (113), a second through hole (114) and a third through hole (115); the plurality of first through holes (113) are all arranged on the circumference of the flange (111); a single second through hole (114) and a single third through hole (115) are sequentially distributed on the same rib (112) along the radial direction of the flange (111); the first pillars (121) are all penetrated in each coaxial first through hole (113); the second pillars (131) are all penetrated in each coaxial second through hole (114); and the third pillars (141) are all penetrated in each coaxial third through hole (115).

5. The phase change heat exchanger according to claim 1, characterized in that: The first coil (21), the second coil (22) and the third coil (23) are the same heat transfer tube (2).

6. The phase change heat exchanger according to claim 1, characterized in that: A gap is provided between each coil of the first coil (21), the second coil (22) and the third coil (23).

7. The phase change heat exchanger according to claim 1, characterized in that: One end of the second coil (22) is connected to an end of the first coil (21) away from the first coil opening (211), and the other end of the second coil (22) is connected to an end of the third coil (23) away from the second coil opening (231).

8. The phase change heat exchanger according to claim 1, characterized in that: The heat transfer tube (2) further comprises a straight tube (24), wherein the straight tube (24) is arranged at the free end of the third coil tube (23), and the free end of the straight tube (24) is provided with the second coil tube port (231). The connecting seat (11) is provided with an inner diameter hole (116), and the straight tube (24) is passed through each of the inner diameter holes (116) so that the first coil tube port (211) and the second coil tube port (231) are located on one side of the same connecting seat (11).

9. A solar energy phase change energy storage and heat exchange system, characterized in that: The invention comprises a phase change heat exchanger (101) as claimed in any one of claims 1 to 8, an energy storage water tank (102), a water distributor (103), a water collector (104), a heat pump unit (105), a water pump (106) and a solar photovoltaic thermal collector (107), wherein an open receiving cavity is provided in the energy storage water tank (102) for storing a phase change liquid, the phase change heat exchanger (101) is arranged in the receiving cavity, the first coil port (211) is connected to the water distributor (103), and the second coil port (212) is connected to the water distributor (103). 31) is connected to the water collector (104), the liquid outlet of the heat pump unit (105) is connected to the liquid inlet of the water pump (106), the liquid outlet of the water pump (106) is connected to the water distributor (103), the liquid inlet of the heat pump unit (105) is connected to the water collector (104), the liquid outlet of the solar photovoltaic thermal collector (107) is connected to the water collector (104), and the liquid inlet of the solar photovoltaic thermal collector (107) is connected to the water distributor (103).

10. The solar energy phase change energy storage and heat exchange system according to claim 9, characterized in that: It also includes a pipeline (108) and a valve (109), and the pipeline (108) and the valve (109) are provided between the water distributor (103), the water collector (104), the heat pump unit (105), the water pump (106) and the solar photovoltaic thermal collector (107) for connection.

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