Immersion type salt solution phase-change heat exchange device for combined cooling and heating system

Abstract

The invention relates to the field of heat exchange equipment, and particularly discloses an immersion type saline solution phase change heat exchange device for a combined cooling and heating system, which comprises a substrate and branched cooling fins of heat exchange pipes, and utilizes an inner channel arranged in the substrate to enable a phase change agent and a heat exchange agent to have a larger contact area, so that the heat exchange efficiency is improved, and the heat exchange efficiency is improved. Meanwhile, through the spraying holes which are formed in the surface of the substrate and communicate with the inner channel, phase change agent liquid flow generates spraying liquid flow through the spraying holes, the heat exchange efficiency is improved, meanwhile, crystallization of the phase change agent on the surface of the heat exchange pipe is reduced, and the freezing and unfreezing speed is increased; and by arranging the first heat exchange equipment and the second heat exchange equipment which are the same in structure, freezing heat supply operation and unfreezing cold supply operation are conducted according to the freezing state, the circulating flowing efficiency of the phase change agent and the heat exchange agent is improved, the requirement for simultaneous cold supply and heat supply is met, and the stability of energy supply is improved.

Description

Technical Field

[0001] The invention relates to the field of heat exchange equipment, and more particularly to an immersed salt solution phase change heat exchange device for a combined cooling and heating system. Background Art

[0002] In the energy supply system, heat exchange devices play a vital role. Among them, the immersed heat exchanger, as a device that directly places the heat exchanger in the heat exchange medium, shows multiple advantages such as efficient heat exchange, simple structure and high adaptability. Phase change heat transfer technology achieves efficient thermal management by cleverly utilizing the phase change characteristics of materials in the process of solid-liquid, liquid-gas and other state transitions.

[0003] Existing phase change heat transfer devices used in combined heat and cooling systems often face a challenge during operation: the phase change solution tends to crystallize on the surface of the heat exchanger. This crystallization phenomenon hinders the effective transfer of heat because the crystal layer reduces the heat exchange efficiency between the heat exchanger and the phase change solution that has not undergone phase change. The basic principle of phase change heat transfer is to use the property of substances to absorb or release a large amount of heat during phase change (such as solid to liquid, or liquid to gas) to achieve efficient thermal management. However, once the phase change solution crystallizes on the surface of the heat exchanger, this layer of solid obstacles will hinder the smooth transfer of heat, resulting in a significant decrease in the overall phase change heat transfer efficiency. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide an immersed salt solution phase change heat exchange device for a combined cooling and heating system, which can reduce the crystallization phenomenon on the surface of the heat exchanger during the phase change heat exchange process.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] An immersed salt solution phase change heat exchange device for a combined cooling and heating system comprises a first heat exchange device and a second heat exchange device of the same structure, wherein the first heat exchange device and the second heat exchange device both comprise a heat exchange box, wherein a plurality of linearly equidistantly arranged branch-shaped heat sinks and a spray pipe arranged above the plurality of branch-shaped heat sinks are arranged in the heat exchange box; the branch-shaped heat sink comprises a substrate and two pairs of heat exchange tubes fixed on the side walls of both sides of the substrate, a serpentine inner channel is provided inside the substrate, a filling pipe connected to the inner channel is fixedly connected to the upper end of the substrate, both the filling pipe and the spray pipe are connected to a phase change agent supply mechanism, a discharge pipe is fixedly connected to the lower end of the substrate, and the discharge pipe is connected to the inner cavity of the heat exchange box; a pair of heat exchange tubes located on the same side of the substrate are both serpentinely distributed and mirror-symmetrical, the projections of the heat exchange tube and the inner channel in the substrate are staggeredly distributed, a plurality of spray holes penetrating the inner channel are provided on the substrate, the spray holes are evenly distributed in the bending gap of the heat exchange tube, and the upper and lower ends of the heat exchange tube are both connected to the heat exchange agent supply mechanism.

[0007] As a further scheme of the present invention, the phase change agent supply mechanism includes a liquid storage tank, in which the phase change agent is stored, the liquid storage tank is connected to a second delivery pump through a pipeline, the second delivery pump is connected to a phase change agent liquid inlet main pipe, the phase change agent liquid inlet main pipe is connected to two phase change agent liquid inlet branch pipes, and a fifth solenoid valve and a sixth solenoid valve are respectively installed on the two phase change agent liquid inlet branch pipes, one of the phase change agent liquid inlet branches is connected to the spray pipe and the filling pipe in the first heat exchange equipment, and the other phase change agent liquid inlet branch pipe is connected to the spray pipe and the filling pipe of the second heat exchange equipment.

[0008] As a further scheme of the present invention, the first heat exchange device and the second heat exchange device are both connected with phase change agent liquid outlet branches under the heat exchange boxes, the two phase change agent liquid outlet branches are connected with the same phase change agent liquid outlet main pipe, and the connecting points are respectively provided with a seventh solenoid valve and an eighth solenoid valve, the phase change agent liquid outlet main pipe is connected with a third delivery pump, the third delivery pump is connected with a reflux main pipe, the reflux main pipe is respectively connected with the first reflux branch pipe and the second reflux branch pipe, and the connecting points are respectively provided with a ninth solenoid valve and a tenth solenoid valve; the first reflux branch pipe is connected with a refrigeration unit, the refrigeration unit is connected with a liquid storage tank through the third reflux branch pipe, and the second reflux branch pipe is connected with the liquid storage tank.

[0009] As a further scheme of the present invention, the heat exchanger supply mechanism includes a heating unit, the liquid outlet end of the heating unit is connected to a heat exchanger liquid inlet main pipe, the heat exchanger liquid inlet main pipe is respectively connected to a pair of heat exchanger liquid inlet branch pipes, and the connecting points are respectively equipped with a first solenoid valve and a second solenoid valve, one of the heat exchanger liquid inlet branches is connected to the heat exchange tube in the first heat exchange device, and the other heat exchanger liquid inlet branch pipe is connected to the heat exchange tube in the second heat exchange device; the lower ends of the heat exchange tubes in the first heat exchange device and the second heat exchange device are respectively connected to heat exchanger liquid outlet branches, the two heat exchanger liquid outlet branches are connected to the same heat exchanger liquid outlet main pipe, and the connecting points are respectively provided with a third solenoid valve and a fourth solenoid valve, and the heat exchanger liquid outlet main pipe is connected to the liquid inlet end of the heating unit.

[0010] As a further solution of the present invention, a pressure valve assembly is provided in the discharge pipe, and the pressure valve assembly includes a guide ring fixedly connected to the inner wall of the discharge pipe, the lower end of the guide ring is abutted against a movable core rod for sealing the guide ring, the lower end of the movable core rod is slidably connected to a support frame, and the upper part of the support frame is abutted against a second spring mounted on the movable core rod.

[0011] As a further solution of the present invention, a pressure plug assembly is provided in the spray hole, and the pressure plug assembly includes a limit plate fixedly connected to the inner wall of the spray hole, the limit plate passes through a piston column extending to the outside of the spray hole, the piston column is provided with a liquid inlet cavity on the side facing the inner channel, the piston column is provided with a reverse spray hole opposite to the limit plate and connected to the liquid inlet cavity, the piston column is located on the inner side of the spray hole and is sleeved with a first spring abutting against the limit plate, and the first spring makes the reverse spray hole on the piston column opposite to the limit plate when no external force is applied.

[0012] As a further solution of the present invention, there are multiple reverse spray holes which are distributed in a reflective manner on the circumferential side wall of the piston column.

[0013] As a further solution of the present invention, the piston column includes a frustum abutting against the outer wall of the substrate, the frustum is fixedly connected to a sliding table extending into the spray hole, the liquid inlet chamber is opened in the sliding table, the sliding table is in the shape of a stepped frustum, the first spring is sleeved on the sliding table, the sliding table is slidably connected to the limit plate, and the limit plate is provided with a through hole for the sliding table to slide.

[0014] As a further solution of the present invention, a prismatic cone is fixedly connected to the outer end of the cone, a plurality of first guide plates facing the branch-like heat sinks are fixedly connected to the inner wall of the heat exchanger box, and a plurality of vertically arranged second guide plates fixedly connected to the inner wall of the heat exchanger box are provided between adjacent branch-like heat sinks, and the second guide plates are in an inverted V shape.

[0015] According to the claim, an immersed salt solution phase change heat exchange device for a combined cooling and heating system is characterized in that it comprises the following steps when in use: Step 1: The first heat exchange device performs a freezing heating operation, starts the first delivery pump and the second delivery pump, and opens the first solenoid valve, the third solenoid valve, and the fifth solenoid valve; injects the phase change agent into the heat exchange box of the first heat exchange device and soaks the branch-shaped heat sink, and at the same time injects the heat exchange agent into the heat exchange tube to exchange heat with the phase change agent, so that the phase change agent in the heat exchange box of the first heat exchange device is frozen, and the heat exchange agent supplies heat to the heating unit; Step 2: The first heat exchanger performs thawing and cooling operations, and the second heat exchanger performs freezing operations; when the first heat exchanger is frozen, the first solenoid valve and the third solenoid valve are closed, and the seventh solenoid valve, the third delivery pump and the tenth solenoid valve are started to inject the phase change agent with a higher temperature in the liquid storage tank into the first heat exchanger, and the frozen blocks in the heat exchange box of the first heat exchanger are impact-thawed; when the thawing is completed and ice slurry is formed, the tenth solenoid valve is closed and the ninth solenoid valve is opened to allow the ice slurry to be injected into the refrigeration unit for cooling operations; when the first heat exchanger is frozen, the second heat exchanger is frozen at the same time, and the second solenoid valve, the fourth solenoid valve and the first delivery pump are started to inject the heat exchange agent into the heat exchange tubes in the second heat exchanger; and the sixth solenoid valve and the second delivery pump are started to inject the phase change agent into the heat exchange box of the second heat exchanger, so that the second heat exchanger performs the freezing operation; Step 3: After the second heat exchange device has completed freezing and the first heat exchange device has completed thawing and cooling operations, the second heat exchange device is thawed and cooled; when the second heat exchange device is thawing, the eighth solenoid valve is closed, and the second delivery pump, the sixth solenoid valve and the tenth solenoid valve are opened. After thawing, the tenth solenoid valve is closed and the ninth solenoid valve is opened to perform cooling operations; Step 4, repeating steps 1 to 3, and performing alternating operations of freezing heating operation and thawing cooling operation according to the freezing state in the first heat exchange device and the second heat exchange device.

[0016] Compared with the prior art, the advantages of the present invention are: (1) The present invention uses a dendrite heat sink including a substrate and a heat exchange tube, and utilizes an inner channel arranged in the substrate to allow the phase change agent and the heat exchange agent to have a larger contact area, thereby improving the heat exchange efficiency, thereby improving the freezing and thawing efficiency. At the same time, through a spray hole arranged on the surface of the substrate and connected to the inner channel, the phase change agent liquid flow passes through the spray hole to generate a spray liquid flow, which not only improves the heat exchange efficiency, but also reduces the crystallization of the phase change agent on the surface of the heat exchange tube, thereby accelerating the freezing and thawing speed.

[0017] (2) The present invention provides a first heat exchange device and a second heat exchange device with the same structure, and performs freezing heating operation and thawing cooling operation according to the freezing state, thereby improving the circulation efficiency of the phase change agent and the heat exchange agent, meeting the needs of simultaneous cooling and heating, and improving the stability of energy supply.

[0018] (3) The present invention is provided with a pressure valve assembly, so that the phase change agent fluid injected into the inner channel through the filling pipe has a higher pressure, thereby increasing the injection pressure of the phase change agent fluid ejected from the nozzle, improving the effect of the phase change agent fluid on removing ice crystals on the surface of the substrate and the heat exchange tube, and improving the heat exchange efficiency during freezing and the thawing efficiency during thawing.

[0019] (4) The present invention is provided with a pressure plug assembly so that the injection pressure of each nozzle on the substrate remains consistent, thereby improving the uniformity of freezing and heat exchange, and utilizing the reverse spray hole to increase the contact time between the phase change agent and the substrate, thereby further improving the heat exchange effect and the ice crystal removal effect. The prismatic cone and guide plate of the pressure plug assembly are used to accelerate the breakage of frozen blocks and increase the speed of ice slurry formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of pipeline connection of the present invention; Figure 2 Schematic diagram of the internal structure of the heat exchange box in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the branch-shaped heat sink in the present invention; Figure 4 It is a schematic cross-sectional structure diagram of the branch-shaped heat sink in the present invention; Figure 5 It is a schematic diagram of the installation of the pressure valve assembly and the pressure plug assembly in the heat exchange box of the present invention; Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle; Figure 7It is a schematic diagram of the three-dimensional structure of the pressure plug assembly in the present invention; Figure 8 It is a schematic diagram of installing the pressure plug assembly on the branch columnar heat sink in the present invention; Fig. 9 for Figure 5 A schematic diagram of the enlarged structure at B in the middle; Fig.10 It is a schematic diagram of the three-dimensional exploded structure of the pressure valve assembly in the present invention.

[0021] Explanation of the numbers in the figure: 1. heat exchange box; 2. branch heat sink; 201. substrate; 202. inner channel; 203. spray hole; 3. heat exchange tube; 4. heat exchange agent inlet branch; 5. first solenoid valve; 6. second solenoid valve; 7. heat exchange agent inlet main pipe; 8. first delivery pump; 9. heating unit; 10. heat exchange agent outlet branch; 11. third solenoid valve; 12. fourth solenoid valve; 13. heat exchange agent outlet main pipe; 14. filling pipe; 15. phase change agent inlet branch; 16. spray pipe; 17. phase change agent inlet main pipe; 18. fifth solenoid valve; 19. sixth solenoid valve; 20. second delivery pump; 21. phase change agent outlet branch; 22. phase change agent outlet Main pipe; 23, seventh solenoid valve; 24, eighth solenoid valve; 25, third delivery pump; 26, reflux main pipe; 27, first reflux branch pipe; 28, ninth solenoid valve; 29, second reflux branch pipe; 30, tenth solenoid valve; 31, refrigeration unit; 32, third reflux branch pipe; 33, liquid storage tank; 34, discharge pipe; 35, limit plate; 36, piston column; 3601, cone; 3602, sliding table; 3603, liquid inlet chamber; 3604, back spray hole; 3605, prismatic cone; 37, first spring; 38, movable core rod; 39, support frame; 40, guide ring; 41, second spring; 42, first guide plate; 43, second guide plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1-4 In one embodiment of the present invention, an immersed salt solution phase change heat exchange device for a combined cooling and heating system includes a first heat exchange device and a second heat exchange device of the same structure, wherein the first heat exchange device and the second heat exchange device both include a heat exchange box 1, wherein the heat exchange box 1 is provided with a plurality of linearly equidistantly arranged branch-shaped heat sinks 2 and a spray pipe 16 arranged above the plurality of branch-shaped heat sinks 2; The dendritic heat sink 2 includes a substrate 201 and two pairs of heat exchange tubes 3 fixed on the side walls of the substrate 201. A serpentine inner channel 202 is provided inside the substrate 201. A filling pipe 14 connected to the inner channel 202 is fixedly connected to the upper end of the substrate 201. Both the filling pipe 14 and the spray pipe 16 are connected to the phase change agent supply mechanism. A discharge pipe 34 is fixedly connected to the lower end of the substrate 201. The discharge pipe 34 is connected to the inner cavity of the heat exchange box 1. A pair of heat exchange tubes 3 located on the same side of the substrate 201 are both serpentinely distributed and mirror-symmetrical. The projections of the heat exchange tubes 3 and the inner channel 202 in the substrate 201 are staggered. A plurality of spray holes 203 penetrating the inner channel 202 are provided on the substrate 201. The spray holes 203 are evenly distributed in the bending gap of the heat exchange tube 3. The upper and lower ends of the heat exchange tube 3 are both connected to the heat exchange agent supply mechanism.

[0026] Specifically, when supplying cold and hot sources, the phase change agent supply mechanism sprays the phase change agent onto the branch-shaped heat sink 2 through the spray pipe 16, and the heat exchange agent supply mechanism injects the heat exchange agent into the heat exchange tube 3. The heat exchange agent flowing through the heat exchange tube 3 exchanges heat with the phase change agent sprayed on its outer shell, and the heat exchange area is increased through the substrate 201 in contact with the heat exchange tube 3, thereby improving the heat exchange efficiency. In addition, the phase change agent supply mechanism injects the phase change agent into the inner channel 202 of the branch-shaped heat sink 2 through the filling pipe 14. The phase change agent continuously flows in the inner channel 202 of the substrate 201, so that the temperature of each part of the substrate 201 is more uniform, further improving the heat exchange efficiency. In addition, through the spray hole 203 connected to the inner channel 202, the phase change agent is sprayed from the surface of the substrate 201 to spray the heat exchange tube 3, thereby reducing the crystallization of the surface of the heat exchange tube 3 and the substrate 201, and reducing the influence of the crystallization of the surface of the substrate 201 and the heat exchange tube 3 on the heat exchange efficiency.

[0027] See also Figure 1 The phase change agent supply mechanism includes a liquid storage tank 33, in which the phase change agent is stored. The liquid storage tank 33 is connected to a second delivery pump 20 through a pipeline, and the second delivery pump 20 is connected to a phase change agent liquid inlet main pipe 17. The phase change agent liquid inlet main pipe 17 is connected to two phase change agent liquid inlet branch pipes 15, and a fifth solenoid valve 18 and a sixth solenoid valve 19 are respectively installed on the two phase change agent liquid inlet branch pipes 15, one of which is connected to the spray pipe 16 and the filling pipe 14 in the first heat exchange device, and the other phase change agent liquid inlet branch pipe 15 is connected to the spray pipe 16 and the filling pipe 14 of the second heat exchange device.

[0028] Specifically, when heat exchange is required in the first heat exchange device, the fifth solenoid valve 18 and the second delivery pump 20 are started to inject the phase change agent into the heat exchange box 1 of the first heat exchange device; when heat exchange is required in the heat exchange box 1 of the second heat exchange device, the second delivery pump 20 and the sixth solenoid valve 19 are started to inject the phase change agent into the heat exchange box 1 of the second heat exchange device.

[0029] See also Figure 1 The first heat exchange device and the second heat exchange device are both connected with a phase change agent outlet branch pipe 21 below the heat exchange box 1. The two phase change agent outlet branch pipes 21 are connected with the same phase change agent outlet main pipe 22, and the connecting points are respectively provided with a seventh solenoid valve 23 and an eighth solenoid valve 24. The phase change agent outlet main pipe 22 is connected with a third delivery pump 25. The third delivery pump 25 is connected with a reflux main pipe 26. The reflux main pipe 26 is respectively connected with a first reflux branch pipe 27 and a second reflux branch pipe 29, and the connecting points are respectively provided with a ninth solenoid valve 28 and a tenth solenoid valve 30; the first reflux branch pipe 27 is connected with a refrigeration unit 31, and the refrigeration unit 31 is connected with a liquid storage tank 33 through a third reflux branch pipe 32, and the second reflux branch pipe 29 is connected with the liquid storage tank 33.

[0030] Specifically, when it is necessary to thaw the frozen salt solution in the heat exchange box 1 corresponding to the first heat exchange equipment, start the second delivery pump 20 and the fifth solenoid valve 18, and simultaneously open the third delivery pump 25, the seventh solenoid valve 23 and the tenth solenoid valve 30; when the heat exchange box 1 of the first heat exchange equipment is thawed and cooling operation is required, open the seventh solenoid valve 23, the ninth solenoid valve 28 and the third delivery pump 25, and inject the ice slurry in the heat exchange box 1 into the cooling unit 31 through the third delivery pump 25.

[0031] See also Figure 1 The heat exchanger supply mechanism includes a heating unit 9, the liquid outlet end of the heating unit 9 is connected with a heat exchanger liquid inlet main pipe 7, the heat exchanger liquid inlet main pipe 7 is respectively connected with a pair of heat exchanger liquid inlet branch pipes 4, and the connecting points are respectively equipped with a first solenoid valve 5 and a second solenoid valve 6, one of the heat exchanger liquid inlet branch pipes 4 is connected with the heat exchange tube 3 in the first heat exchange device, and the other heat exchanger liquid inlet branch pipe 4 is connected with the heat exchange tube 3 in the second heat exchange device; the lower ends of the heat exchange tubes 3 in the first heat exchange device and the second heat exchange device are respectively connected with heat exchanger liquid outlet branch pipes 10, the two heat exchanger liquid outlet branch pipes 10 are connected with the same heat exchanger liquid outlet main pipe 13, and the connecting points are respectively provided with a third solenoid valve 11 and a fourth solenoid valve 12, and the heat exchanger liquid outlet main pipe 13 is connected with the liquid inlet end of the heating unit 9.

[0032] Specifically, when the heat exchanger needs to be injected into the first heat exchange device, the first delivery pump 8, the first solenoid valve 5 and the third solenoid valve 11 are started; when the heat exchanger needs to be injected into the second heat exchange device, the first delivery pump 8, the second solenoid valve 6 and the fourth solenoid valve 12 are started.

[0033] When performing heating and cooling operations, refer to Figure 1 , including the following steps: Step 1: The first heat exchange device performs a freezing heating operation, starts the first delivery pump 8 and the second delivery pump 20, and opens the first solenoid valve 5, the third solenoid valve 11, and the fifth solenoid valve 18; injects the phase change agent into the heat exchange box 1 of the first heat exchange device and infiltrates the branch-shaped heat sink 2, and at the same time injects the heat exchange agent into the heat exchange tube 3 to exchange heat with the phase change agent, so that the phase change agent in the heat exchange box 1 of the first heat exchange device is frozen, and the heat exchange agent supplies heat to the heating unit 9; Specifically, the heat exchange medium after heat exchange flows back to the heating unit 9 to perform heating operation; Step 2: The first heat exchange device performs thawing and cooling operations, and the second heat exchange device performs freezing operations; when the first heat exchange device is frozen, the first solenoid valve 5 and the third solenoid valve 11 are closed, and the seventh solenoid valve 23, the third delivery pump 25 and the tenth solenoid valve 30 are started to inject the phase change agent with a higher temperature in the liquid storage tank 33 into the first heat exchange device, and the frozen blocks in the heat exchange box 1 of the first heat exchange device are impact-thawed; When the thawing is completed and ice slurry is formed, the tenth solenoid valve 30 is closed and the ninth solenoid valve 28 is opened, so that the ice slurry is injected into the cooling unit 31 for cooling operation; When the first heat exchange device is frozen, the second heat exchange device is frozen at the same time, the second solenoid valve 6, the fourth solenoid valve 12 and the first delivery pump 8 are started to inject the heat exchange agent into the heat exchange pipe 3 in the second heat exchange device; and the sixth solenoid valve 19 and the second delivery pump 20 are started to inject the phase change agent into the heat exchange box 1 of the second heat exchange device, so that the second heat exchange device is frozen; Specifically, the frozen blocks in the first heat exchange device are thawed by the phase change agent with a higher temperature in the liquid storage tank 33, and the thawed ice slurry is injected into the cooling unit 31 for cooling operation; at the same time, the freezing operation is performed in the second heat exchange device, and the heat of the freezing heat exchange of the second heat exchange device is transferred to the heating unit 9 for heating, and cooling and heating operations are performed simultaneously; Step 3: After the second heat exchange device has completed freezing and the first heat exchange device has completed thawing and cooling operations, the second heat exchange device is thawed and cooled; when the second heat exchange device is thawing, the eighth solenoid valve 24 is closed, and the second delivery pump 20, the sixth solenoid valve 19 and the tenth solenoid valve 30 are opened. After thawing, the tenth solenoid valve 30 is closed and the ninth solenoid valve 28 is opened to perform cooling operations; Step 4, repeating steps 1 to 3, and performing alternating operations of freezing heating operation and thawing cooling operation according to the freezing state in the first heat exchange device and the second heat exchange device.

[0034] It should be noted that the phase change agent is a low-temperature salt solution and the heat exchange agent is an ethylene glycol solution.

[0035] Compared with the traditional combined heat and cold supply system, the present invention is provided with a first heat exchange device and a second heat exchange device with the same structure, which perform freezing heating operations and thawing cooling operations according to the freezing state, thereby improving the circulation efficiency of the phase change agent and the heat exchanger, meeting the needs of simultaneous cooling and heating, and improving the stability of energy supply.

[0036] In another embodiment of the present invention, see Figure 5 , Fig. 9 and Fig.10 A pressure valve assembly is provided in the discharge pipe 34, and the pressure valve assembly includes a guide ring 40 fixedly connected to the inner wall of the discharge pipe 34, and a movable core rod 38 for sealing the guide ring 40 is abutted at the lower end of the guide ring 40, and a support frame 39 is slidably connected to the lower end of the movable core rod 38, and a second spring 41 sleeved on the movable core rod 38 is abutted above the support frame 39.

[0037] Specifically, by providing a pressure valve assembly at the lower end of the discharge pipe 34, the phase change agent fluid injected into the inner channel 202 through the filling pipe 14 has a greater pressure, thereby increasing the injection pressure of the phase change agent fluid ejected from the nozzle 203, improving the effect of the phase change agent fluid on removing ice crystals on the surface of the substrate 201 and the heat exchange tube 3, and improving the heat exchange efficiency during freezing and the thawing efficiency during thawing.

[0038] See also Figure 6-8 A pressure plug assembly is provided in the spray hole 203, and the pressure plug assembly includes a limit plate 35 fixedly connected to the inner wall of the spray hole 203. The limit plate 35 passes through a piston column 36 extending to the outside of the spray hole 203. The piston column 36 is provided with a liquid inlet chamber 3603 on the side facing the inner channel 202. The piston column 36 is provided with a reverse spray hole 3604 opposite to the limit plate 35 and connected to the liquid inlet chamber 3603. The piston column 36 is located on the inner side of the spray hole 203 and is sleeved with a first spring 37 abutting against the limit plate 35. The first spring 37 makes the reverse spray hole 3604 on the piston column 36 opposite to the limit plate 35 when no external force is applied.

[0039] Specifically, by providing a pressure plug assembly, the spray hole 203 is in a closed state when there is no phase change agent flowing in the inner channel 202, and the spray pressure of each spray hole 203 on the substrate 201 is kept consistent, thereby improving the uniformity of freezing and heat exchange. It should be noted that the stiffness coefficient of the first spring 37 is smaller than the stiffness coefficient of the second spring 41.

[0040] See also Figure 6 and Figure 7 There are multiple reverse spray holes 3604 which are distributed on the circumferential side wall of the piston column 36 in a reflective shape.

[0041] Specifically, when the piston rod 36 drives the reverse spray hole 3604 to move to the outside of the spray hole 203, the phase change agent fluid is sprayed in the reverse direction toward the surface of the substrate 201 and the heat exchange tube 3, further reducing the crystallization on the surface of the dendrite heat sink 2 and improving the thawing efficiency.

[0042] See also Figure 6 and Figure 7 The piston column 36 includes a cone 3601 abutting against the outer wall of the substrate 201, the cone 3601 is fixedly connected to a sliding table 3602 extending into the spray hole 203, the liquid inlet chamber 3603 is opened in the sliding table 3602, the sliding table 3602 is in the shape of a stepped frustum, the first spring 37 is sleeved on the sliding table 3602, the sliding table 3602 is slidably connected to the limit plate 35, and the limit plate 35 is provided with a through hole for the sliding table 3602 to slide.

[0043] Specifically, the limiting plate 35 and the first spring 37 are used to limit the piston column 36 , and the injection of the phase change agent is achieved through the liquid inlet cavity 3603 and the reverse injection hole 3604 .

[0044] See also Figure 7 A prismatic cone 3605 is fixedly connected to the outer end of the cone 3601, a plurality of first guide plates 42 facing the branch-like fins 2 are fixedly connected to the inner wall of the heat exchange box 1, and a plurality of vertically arranged second guide plates 43 fixedly connected to the inner wall of the heat exchange box 1 are provided between adjacent branch-like fins 2, and the second guide plates 43 are in an inverted V shape.

[0045] Specifically, during thawing, the first guide plate 42 and the second guide plate 43 cause the thawing blocks to fall toward the branch-shaped heat sink 2, accelerating the thawing of the frozen blocks, and accelerate the breaking of the frozen blocks through the prismatic cone 3605, thereby improving the thawing efficiency.

[0046] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An immersed salt solution phase change heat exchange device for a combined cooling and heating system, characterized in that: The invention comprises a first heat exchange device and a second heat exchange device of the same structure, wherein the first heat exchange device and the second heat exchange device both comprise a heat exchange box (1), wherein a plurality of branch-shaped heat sinks (2) arranged linearly and equidistantly are arranged in the heat exchange box (1), and a spray pipe (16) arranged above the plurality of branch-shaped heat sinks (2); the branch-shaped heat sinks (2) comprise a substrate (201) and two pairs of heat exchange pipes (3) fixed on the side walls of the substrate (201); a serpentine inner channel (202) is provided inside the substrate (201); a filling pipe (14) communicating with the inner channel (202) is fixedly connected to the upper end of the substrate (201); the filling pipe (14) and the spray pipe (16) are connected to the inner channel (202); Both the shower pipe (16) and the inner channel (202) are connected to a phase change agent supply mechanism. The lower end of the substrate (201) is fixedly connected to a discharge pipe (34), and the discharge pipe (34) is connected to the inner cavity of the heat exchange box (1). A pair of heat exchange tubes (3) located on the same side of the substrate (201) are both arranged in a serpentine shape and are mirror-symmetrical. The projections of the heat exchange tubes (3) and the inner channel (202) in the substrate (201) are arranged in an interlaced manner. A plurality of spray holes (203) penetrating the inner channel (202) are provided on the substrate (201). The spray holes (203) are evenly distributed in the bending gap of the heat exchange tube (3). The upper end and the lower end of the heat exchange tube (3) are both connected to the heat exchange agent supply mechanism.

2. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 1, characterized in that: The phase change agent supply mechanism comprises a liquid storage tank (33), in which the phase change agent is stored, the liquid storage tank (33) is connected to a second delivery pump (20) via a pipeline, the second delivery pump (20) is connected to a phase change agent liquid inlet main pipe (17), the phase change agent liquid inlet main pipe (17) is connected to two phase change agent liquid inlet branch pipes (15), and a fifth solenoid valve (18) and a sixth solenoid valve (19) are respectively installed on the two phase change agent liquid inlet branch pipes (15), one of the phase change agent liquid inlet branch pipes (15) is connected to a spray pipe (16) and a filling pipe (14) in the first heat exchange device, and the other phase change agent liquid inlet branch pipe (15) is connected to the spray pipe (16) and the filling pipe (14) of the second heat exchange device.

3. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 2, characterized in that: The heat exchange boxes (1) of the first heat exchange device and the second heat exchange device are both connected with a phase change agent liquid outlet branch pipe (21) below, the two phase change agent liquid outlet branch pipes (21) are connected with the same phase change agent liquid outlet main pipe (22), and a seventh solenoid valve (23) and an eighth solenoid valve (24) are respectively provided at the connecting point, the phase change agent liquid outlet main pipe (22) is connected with a third delivery pump (25), the third delivery pump (25) is connected with a reflux main pipe (26), the reflux main pipe (26) is respectively connected with a first reflux branch pipe (27) and a second reflux branch pipe (29), and a ninth solenoid valve (28) and a tenth solenoid valve (30) are respectively provided at the connecting point; the first reflux branch pipe (27) is connected with a refrigeration unit (31), the refrigeration unit (31) is connected with a liquid storage tank (33) through the third reflux branch pipe (32), and the second reflux branch pipe (29) is connected with the liquid storage tank (33).

4. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 3, characterized in that: The heat exchanger supply mechanism comprises a heating unit (9), wherein the liquid outlet end of the heating unit (9) is connected to a heat exchanger liquid inlet main pipe (7), the heat exchanger liquid inlet main pipe (7) is respectively connected to a pair of heat exchanger liquid inlet branch pipes (4), and the connecting points are respectively provided with a first solenoid valve (5) and a second solenoid valve (6), wherein one heat exchanger liquid inlet branch pipe (4) is connected to a heat exchange tube (3) in a first heat exchange device, and the other heat exchanger liquid inlet branch pipe (4) is connected to a heat exchange tube (3) in a second heat exchange device; the lower ends of the heat exchange tubes (3) in the first heat exchange device and the second heat exchange device are respectively connected to heat exchanger liquid outlet branch pipes (10), the two heat exchanger liquid outlet branch pipes (10) are connected to the same heat exchanger liquid outlet main pipe (13), and the connecting points are respectively provided with a third solenoid valve (11) and a fourth solenoid valve (12), and the heat exchanger liquid outlet main pipe (13) is connected to the liquid inlet end of the heating unit (9).

5. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 1, characterized in that: The discharge pipe (34) is provided with a pressure valve assembly, which includes a guide ring (40) fixedly connected to the inner wall of the discharge pipe (34); a movable core rod (38) for sealing the guide ring (40) is abutted at the lower end of the guide ring (40); a support frame (39) is slidably connected to the lower end of the movable core rod (38); and a second spring (41) sleeved on the movable core rod (38) is abutted at the upper end of the support frame (39).

6. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 5, characterized in that: A pressure plug assembly is provided in the spray hole (203), the pressure plug assembly comprising a limit plate (35) fixedly connected to the inner wall of the spray hole (203), the limit plate (35) penetrates a piston column (36) extending to the outside of the spray hole (203), a liquid inlet cavity (3603) is provided on the side of the piston column (36) facing the inner channel (202), a reverse spray hole (3604) is provided on the piston column (36) and is opposite to the limit plate (35) and communicates with the liquid inlet cavity (3603), and a first spring (37) is sleeved on the inner side of the piston column (36) located at the spray hole (203) and abuts against the limit plate (35), and the first spring (37) enables the reverse spray hole (3604) on the piston column (36) to be opposite to the limit plate (35) when no external force is applied thereto.

7. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 6, characterized in that: The reverse spray holes (3604) are multiple in number and are distributed in a reflective manner on the circumferential side wall of the piston column (36).

8. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 6, characterized in that: The piston column (36) comprises a cone (3601) abutting against the outer wall of the substrate (201); the cone (3601) is fixedly connected to a sliding table (3602) extending into the spray hole (203); the liquid inlet cavity (3603) is arranged in the sliding table (3602); the sliding table (3602) is in the shape of a stepped frustum; the first spring (37) is sleeved on the sliding table (3602); the sliding table (3602) is slidably connected to the limit plate (35); the limit plate (35) is provided with a through hole for the sliding table (3602) to slide.

9. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 8, characterized in that: The outer end of the frustum (3601) is fixedly connected to a prismatic cone (3605); the inner wall of the heat exchange box (1) is fixedly connected to a plurality of first guide plates (42) facing the branch-shaped heat sinks (2); and between adjacent branch-shaped heat sinks (2) are provided a plurality of vertically arranged second guide plates (43) fixedly connected to the inner wall of the heat exchange box (1); the second guide plates (43) are in an inverted V shape.

10. The immersed salt solution phase change heat transfer device for a combined cooling and heating system according to claim 4, characterized in that: The use includes the following steps: Step 1: The first heat exchange device performs a freezing heating operation, starts the first delivery pump (8) and the second delivery pump (20), and opens the first solenoid valve (5), the third solenoid valve (11), and the fifth solenoid valve (18); injects a phase change agent into the heat exchange box (1) of the first heat exchange device and soaks the branch-shaped heat sink (2); and simultaneously injects the heat exchange agent into the heat exchange tube (3) to exchange heat with the phase change agent, so that the phase change agent in the heat exchange box (1) of the first heat exchange device is frozen, and the heat exchange agent supplies heat to the heating unit (9); Step 2: The first heat exchange device performs a thawing operation and a cooling operation, and the second heat exchange device performs a freezing operation; when the first heat exchange device is frozen, the first solenoid valve (5) and the third solenoid valve (11) are closed, and the seventh solenoid valve (23), the third delivery pump (25) and the tenth solenoid valve (30) are started to inject the phase change agent with a higher temperature in the liquid storage tank (33) into the first heat exchange device, and the frozen blocks in the heat exchange box (1) of the first heat exchange device are impact-thawed; when the thawing is completed and ice slurry is formed, the tenth solenoid valve (30) is closed. ) and opening the ninth solenoid valve (28) so that ice slurry is injected into the refrigeration unit (31) to perform a refrigeration operation; when the first heat exchange device is frozen, the second heat exchange device is frozen at the same time, the second solenoid valve (6) and the fourth solenoid valve (12) and the first delivery pump (8) are started to inject heat exchange agent into the heat exchange pipe (3) in the second heat exchange device; and the sixth solenoid valve (19) and the second delivery pump (20) are started to inject phase change agent into the heat exchange box (1) of the second heat exchange device, so that the second heat exchange device performs a freezing operation; Step three, when the second heat exchange device completes freezing and the first heat exchange device completes thawing and cooling operations, the second heat exchange device is subjected to thawing and cooling operations; when the second heat exchange device is subjected to thawing operations, the eighth solenoid valve (24) is closed, and the second delivery pump (20), the sixth solenoid valve (19) and the tenth solenoid valve (30) are opened; after thawing is completed, the tenth solenoid valve (30) is closed and the ninth solenoid valve (28) is opened to perform cooling operations; Step 4, repeating steps 1 to 3, and performing alternating operations of freezing heating operation and thawing cooling operation according to the freezing state in the first heat exchange device and the second heat exchange device.

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