A heat exchange system based on inorganic phase change heat storage rods

Abstract

The application provides a heat exchange system based on inorganic phase change heat storage rods, which comprises a box body, a plurality of hexagonal heat storage rods arranged in the box body, and each of the hexagonal heat storage rods comprises a heat storage rod shell prepared by using a plastic blow molding process, a filling port processed on the heat storage rod shell, a solid inorganic phase change heat storage material layer formed by injecting liquid inorganic phase change heat storage material into the inner cavity of the heat storage rod shell from the filling port, a gas injection port of the plastic blow molding process covering the filling port, and a sealing structure sealing the filling port. The application adopts the plastic blow molding process to prepare the shell of the hexagonal heat storage rod, processes the filling port, fills the inorganic phase change heat storage material into the shell, and then seals to form the inorganic phase change heat storage rod. The manufacturing process is simple, and the inorganic phase change heat storage device is beneficial to efficient and large-scale manufacturing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medium heat exchange, in particular to a heat exchange system based on inorganic phase change heat storage rod. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute the prior art.

[0003] The inorganic phase change heat storage rod is a kind of inorganic substance that uses the heat capacity and latent heat of phase change when storing and releasing heat energy. The inorganic phase change heat storage rod usually includes a cladding container and an inorganic filler filled in the cladding container, and the inorganic filler can be solid or liquid. Because the inorganic filler has large heat capacity and latent heat of phase change, when storing heat energy, the inorganic filler absorbs heat and temperature rises, thereby storing heat energy; when releasing heat energy, the inorganic filler releases heat and temperature drops, thereby releasing the stored heat energy.

[0004] When manufacturing the inorganic phase change heat storage rod, both the heat range required to be stored and released by the inorganic filler and the shape of the cladding container required to be selected according to the use environment of the inorganic filler should be considered, so as to meet the energy storage and release requirements of the heat storage rod in use.

[0005] The Chinese invention patent with publication number CN108219753A discloses a preparation method and application of a self-heating bag. The self-heating bag is mainly composed of a phase change material and a metal sheet. The metal sheet needs to be bent to release the crystal seeds in the metal gap to trigger nucleation. It is only suitable for local physiotherapy and health care field, and has great limitations.

[0006] In order to overcome the problem of great limitations, the Chinese invention patent with publication number CN110173907A discloses a controllable phase change material package and its preparation method and application. A controllable trigger metal electrode is obtained by processing a metal plate or rod; a supersaturated phase change heat storage solution is poured into a stainless steel ball, and then the controllable trigger metal electrode and the conductive electrode are inserted and packaged; finally, the controllable phase change material package is obtained by placing it in a water bath for heat preservation. Although the preparation process is simple, the method has the defect of low heat transfer efficiency.

[0007] Therefore, how to improve the heat transfer efficiency of the inorganic phase change heat storage device becomes a technical problem to be solved. SUMMARY

[0008] The present application provides a heat exchange system based on inorganic phase change heat storage rod. Multiple hexagonal heat storage rods are installed in the box at the same time. The multiple hexagonal heat storage rods participate in heat exchange at the same time to improve the heat transfer efficiency. The hexagonal heat storage rod is prepared by using a plastic blow molding process to further improve the heat transfer efficiency.

[0009] The technical scheme for achieving the object of the present application is as follows:

[0010] A heat exchange system based on inorganic phase change heat storage rods comprises a box, a plurality of hexagonal heat storage rods placed in the box, and the plurality of hexagonal heat storage rods arranged in the box.

[0011] Each of the hexagonal heat storage rods comprises a heat storage rod shell prepared by a plastic blow molding process, a filling port processed on the heat storage rod shell, a solid inorganic phase change heat storage material layer formed by injecting liquid inorganic phase change heat storage material into the inner cavity of the heat storage rod shell from the filling port, and the filling port covering the air injection port of the plastic blow molding process and being sealed by a sealing structure.

[0012] The present application adopts the plastic blow molding process to prepare the shell of the hexagonal heat storage rod, processes the filling port, fills the inorganic phase change heat storage material into the shell, and then seals to form the inorganic phase change heat storage rod.

[0013] The inorganic phase change heat storage device is generally prepared by filling phase change materials (such as silicate or aluminum oxide) into a container with high heat conduction, solidifying into blocks or particles under appropriate conditions, and then assembling and packaging.

[0014] In a possible implementation, the hexagonal heat storage rod is provided with a first heat exchange medium flow channel, and a second heat exchange medium flow channel arranged in the box and in heat exchange with the hexagonal heat storage rod.

[0015] The box is provided with an inlet liquid distributor and an outlet liquid concentrator, the inlet liquid distributor comprises an inlet liquid main pipe and a plurality of inlet liquid outlet pipes, and the outlet liquid concentrator comprises a plurality of outlet liquid branch pipes and an outlet liquid main pipe.

[0016] Each of the hexagonal heat storage rods is connected with one inlet liquid outlet pipe and one outlet liquid branch pipe.

[0017] The present application is provided with an inlet liquid distributor and an outlet liquid concentrator outside the box, which is more conducive to the simultaneous entry of the heat exchange medium into the plurality of hexagonal heat storage rods for heat exchange. The present application uses inorganic phase change heat storage material for heat storage, uses the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel to drive the hexagonal heat storage rod to rotate, and uses the rotating hexagonal heat storage rod to realize the heat exchange between the first heat exchange medium and the second heat exchange medium. The present application uses the heat exchange medium to drive the hexagonal heat storage rod to rotate to avoid the phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod, effectively solving the problem of phase separation of the inorganic phase change heat storage material. The present application uses a plurality of straight-through flow channels to flow the first heat exchange medium, uses the first heat exchange medium to exchange heat in the straight-through flow channel, uses the kinetic energy generated by the second heat exchange medium falling from the top end to the bottom end of the hexagonal heat storage rod to drive the hexagonal heat storage rod to rotate, and further solves the problem of phase change separation.

[0018] In a possible implementation, a sealing structure is arranged between each liquid inlet and outlet pipe and the tank, and between each liquid outlet branch pipe and the tank.

[0019] The sealing structure is arranged to prevent the second heat exchange medium from corroding or polluting the space outside the tank.

[0020] In a possible implementation, a bearing is arranged between each liquid inlet and outlet pipe and the hexagonal heat storage rod, and between each liquid outlet branch pipe and the hexagonal heat storage rod.

[0021] The bearing is arranged between the liquid inlet and outlet pipe and the hexagonal heat storage rod, and between the liquid outlet branch pipe and the hexagonal heat storage rod, so that the liquid inlet and outlet pipe and the liquid outlet branch pipe do not rotate with the hexagonal heat storage rod.

[0022] In a possible implementation, the first heat exchange medium flow channel comprises an inlet manifold, a distribution structure, a plurality of straight flow channels, and a collection structure.

[0023] The inlet manifold is connected to the first liquid inlet, the collection structure is connected to the first liquid outlet, the plurality of straight flow channels are located in the hexagonal heat storage rod, and the distribution structure and the collection structure are connected to the plurality of straight flow channels.

[0024] In a possible implementation, the hexagonal heat storage rod has a hexagonal cross section.

[0025] Each corner of the hexagon is connected to a circle.

[0026] Each corner of the hexagon is provided with a straight flow channel, and the curved part of the straight flow channel is located at the circle of each corner.

[0027] The middle top end of the hexagon is provided with an inlet manifold, and the middle bottom end of the hexagon is provided with an outlet manifold, the inlet manifold is connected to the first liquid inlet, and the outlet manifold is connected to the first liquid outlet.

[0028] The inlet manifold is connected to a liquid inlet distributor, and the outlet manifold is connected to a liquid outlet collector.

[0029] In a possible implementation, the hexagonal heat storage rod comprises a heat storage rod shell and an inorganic phase change heat storage material layer.

[0030] The heat storage rod shell matches the shape of the hexagonal heat storage rod and the first heat exchange medium flow channel, and the inorganic phase change heat storage material layer is located in the heat storage rod shell.

[0031] Preferably, the hexagonal heat storage rod of the present application comprises an inorganic phase change heat storage material layer, a heat conduction wrapping layer, and a heat storage rod shell. The inorganic phase change heat storage material layer is the core part of the hexagonal heat storage rod, which is a material that undergoes a phase change process at a specific temperature and can absorb or release a large amount of heat during the phase change process, thereby achieving temperature regulation and stabilization through heat absorption or release. The heat conduction wrapping layer is a layer of material wrapped around the phase change material to improve the heat conduction performance of the phase change material, transfer heat into the phase change material, and release it to the environment. Common heat-conducting materials include nano-silicon dioxide, graphene, and nano-carbon. The heat storage rod shell is used to protect the inorganic phase change heat storage material from the environment inside the box, while also improving the stability and durability of the inorganic phase change heat storage material. The heat conduction wrapping layer and the heat storage rod shell transfer heat from the heat source to the inorganic phase change heat storage material.

[0032] The present application uses inorganic phase change heat storage material to store heat, and uses the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel to drive the hexagonal heat storage rod to rotate, so that the rotating hexagonal heat storage rod realizes heat exchange between the first heat exchange medium and the second heat exchange medium. The present application uses heat exchange medium to drive the hexagonal heat storage rod to rotate to avoid phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod, effectively solving the problem of phase separation of the inorganic phase change heat storage material.

[0033] In one possible implementation, the first liquid inlet and the first liquid outlet are both arranged opposite to the straight-through flow channel of the hexagonal heat storage rod;

[0034] The second liquid inlet and the second liquid outlet are arranged at the corners of the box.

[0035] In one possible implementation, the heat storage rod shell is prepared by the following steps:

[0036] Step 11, extruding a hollow plastic tube, cutting the hollow plastic tube according to the longitudinal length of the prepared inorganic phase change heat storage rod to obtain a hollow tube preform;

[0037] Step 12, placing the hollow tube preform between a left half mold and a right half mold matched with the shape of the prepared inorganic phase change heat storage rod, and closing the left half mold and the right half mold from bottom to top to ensure that the left half mold and the right half mold clamp the hollow tube preform;

[0038] Step 13, injecting high-pressure air into the hollow tube preform, and the hollow tube preform expands and uniformly forms along the cavity of the left half mold and the cavity of the right half mold, and after cooling, a hollow heat storage rod shell is obtained.

[0039] The present application selects plastic blow molding technology to make products of various shapes and sizes, which has strong plasticity. It is suitable for processing heat storage rod shells of various cross-sectional shapes and sizes. Moreover, the plastic blow molding technology is a one-time molding process, which has the advantage of high production efficiency.

[0040] In a possible implementation, the step 11 comprises:

[0041] The plastic particles are fed into the hopper of the extruder, and the plastic particles are extruded into the hollow plastic tube in a semi-melted state;

[0042] The hollow plastic tube is fed into the storage cylinder for heat preservation to prevent the hollow plastic tube from being deformed due to cooling;

[0043] The hollow plastic tube is cut according to the longitudinal length of the inorganic phase change heat storage rod to obtain a hollow tube parison.

[0044] The diameter of the hollow plastic tube is determined according to the circumference of the transverse section of the inorganic phase change heat storage rod, and the extrusion thickness of the hollow plastic tube is determined according to the required pressure bearing of the hollow channel of the inorganic phase change heat storage rod.

[0045] In a possible implementation, the step 12 comprises:

[0046] The left half mold and the right half mold for preparing the inorganic phase change heat storage rod are prepared, and the inner cavity formed by the left half mold and the right half mold being combined is matched with the shape of the inorganic phase change heat storage rod;

[0047] After the hollow tube parison is cut by the cutting device, the hollow tube parison is quickly lowered to the center of the separated left half mold and right half mold by using the storage cylinder;

[0048] The left half mold and the right half mold are slowly combined until the left half mold and the right half mold clamp the hollow tube parison; during the slow combination process, the lower part of the left half mold and the lower part of the right half mold first contact, then the middle part of the left half mold and the middle part of the right half mold contact, and finally the upper part of the left half mold and the upper part of the right half mold contact, and during the final combination stroke, the air in the cavity formed by the combination is discharged from the upper part.

[0049] The two half molds are slowly combined at a certain speed, and the lower edges of the two half molds first contact, so that the hollow part of the hollow channel parison maintains a certain pressure during the combination process, and part of the air in the cavity is discharged from the upper part during the final combination stroke, so that the hollow tube of the finished inorganic phase change heat storage rod does not adhere to the wall.

[0050] In a possible implementation, the step 13 comprises:

[0051] An air inlet is connected to the upper outlet of the hollow tube parison;

[0052] Inject high pressure air from the inflation port to the hollow tube parison to blow up, so that the hollow tube parison reaches the shape of the mold cavity; the inflation pressure of the high pressure air is between 0.2-0.7Mpa, the blow molding temperature of the hollow tube parison is 80-280℃, and the blow up time of the hollow tube parison is kept at 10-45s;

[0053] During the blow up pressure maintaining process of the hollow tube parison, the heat storage rod shell is cooled down by the mold, and the heat storage rod shell is gradually solidified during the cooling process;

[0054] The high pressure inflation head is removed from the inflation port, and the deflation of the heat storage rod shell is completed.

[0055] The inflation pressure of the present application is between 0.2-0.7Mpa, and is controlled as high as possible, the blow molding temperature is 80-280℃, so as to ensure that the plastic is attached to the mold wall, and the wall thickness of the hollow channel is uniform.

[0056] Compared with the prior art, the present application has the following beneficial effects:

[0057] The present application adopts the plastic blow molding process to prepare the shell of the hexagonal heat storage rod, fills the inorganic phase change heat storage material into the shell through the filling port, and then seals to form the inorganic phase change heat storage rod. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 A heat exchange system based on the inorganic phase change heat storage rod is provided in the present application Figure One ;

[0059] Figure 2 A first heat exchange medium flow module is provided in the present application

[0060] Figure 3 A heat exchange system based on the inorganic phase change heat storage rod is provided in the present application Figure Two ;

[0061] Figure 4 A Figure 3 partial enlarged view of the middle A part

[0062] Figure 5 A Figure 3 partial enlarged view of the middle B part

[0063] Figure 6 A hexagonal heat storage rod structure is provided in the present application

[0064] 1 - box; 2 - hexagonal heat storage rod; 3 - liquid inlet distributor; 31 - liquid inlet branch pipe; 32 - liquid inlet main pipe; 4 - liquid outlet collector; 41 - liquid outlet branch pipe; 42 - liquid outlet main pipe; 5 - first heat exchange medium flow channel; 6 - second heat exchange medium flow channel; 7 - bearing; 8 - plugging structure. DETAILED DESCRIPTION

[0065] The present application will be described in detail below with reference to the embodiments shown in the drawings, but it should be noted that these embodiments are not a limitation on the present application, and equivalent transformations or substitutions of function, method, or structure made by those of ordinary skill in the art based on these embodiments are within the scope of the present application.

[0066] The difficulties in manufacturing inorganic phase change heat storage rods include the following aspects: (1) selection of phase change materials: there are many types of inorganic phase change materials, and the selection of materials with high heat storage density, good stability, and easy melting is the primary difficulty in manufacturing inorganic phase change heat storage rods. (2) coating of phase change materials: phase change materials are not easy to contact with heat transfer medium, so they need to be wrapped in suitable materials to contact with heat transfer medium. However, the selection of coating materials and the control of wrapping process need to overcome certain technical difficulties. (3) design and processing of heat storage rods: reasonable design, shape meeting the requirements, high processing precision, and good surface finish will affect the physical properties and thermal durability of the heat storage rods, which are also key technical problems that need to be solved in the manufacture of inorganic phase change heat storage rods. (4) optimization of heat transfer performance: in order to improve the heat transfer efficiency of the heat storage rod, the selection and amount of heat transfer medium need to be optimized, and the heat transfer structure needs to be designed reasonably. These aspects need to be continuously tested and improved to achieve the best heat transfer performance. (5) stability of product quality: the stability of the production process needs to be controlled to ensure the consistency of the performance and quality of the products in batch production.

[0067] Coating of inorganic phase change materials can improve their stability, controllability, and cycle life, which is a key technology for energy storage. In the manufacturing process, the following points need to be considered: (1) selection of suitable coating materials: the coating material needs to be compatible with the phase change material and have good thermal conductivity, chemical stability, and mechanical strength. (2) achieving controllable coating thickness: appropriate coating thickness can enhance the stability and cycle life of the phase change material, while minimizing the impact of the coating layer on the phase change material. (3) solving the interface problem between the phase change material and the coating layer: the interface is prone to stress concentration and chemical reactions, which can affect the performance and stability of the phase change material. (4) achieving large-scale preparation and industrial production: the preparation of inorganic phase change materials requires high cost and specialized technology, and how to achieve efficient preparation and large-scale production is an important difficulty.

[0068] Based on the above, the embodiment of the present application provides a heat exchange system based on inorganic phase change heat storage rods, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 , comprising: a box body 1, a plurality of hexagonal heat storage rods 2 placed in the box body 1; the plurality of hexagonal heat storage rods 2 are arranged in the box body 1; each hexagonal heat storage rod 2 comprises: a heat storage rod shell prepared by a plastic blow molding process, a filling port processed on the heat storage rod shell, a solid inorganic phase change heat storage material layer formed by injecting a liquid inorganic phase change heat storage material into the inner cavity of the heat storage rod shell from the filling port; the filling port covers the air injection port of the plastic blow molding process, and the sealing structure seals the filling port.

[0069] The embodiment of the present application adopts the plastic blow molding process to prepare the shell of the hexagonal heat storage rod 2, processes the filling port, fills the inorganic phase change heat storage material into the shell, and then seals to form the inorganic phase change heat storage rod. The manufacturing process is simple, and it is beneficial to the efficient and large-scale manufacturing of the inorganic phase change heat storage device.

[0070] The inorganic phase change heat storage device of the embodiment of the present application is generally formed by filling phase change materials (such as silicate or aluminum oxide) into a container with high heat conduction, and solidifying into block or granular shape under appropriate conditions, and then assembling and packaging.

[0071] Based on the above, the embodiment of the present application provides a heat exchange system based on inorganic phase change heat storage rods, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 , preferably, the first heat exchange medium flow channel 5 is arranged in the hexagonal heat storage rod 2, and the second heat exchange medium flow channel 6 is arranged in the box body 1 and exchanges heat with the hexagonal heat storage rod 2; the liquid inlet distributor 3 and the liquid outlet collector 4 are installed on the box body 1, the liquid inlet distributor 3 comprises a liquid inlet main pipe 32 and a plurality of liquid outlet pipes 31, and the liquid outlet collector 4 comprises a plurality of liquid outlet branch pipes 41 and a liquid outlet main pipe 42; each hexagonal heat storage rod 2 is communicated with one liquid outlet pipe 31 and one liquid outlet branch pipe 41.

[0072] The embodiment of the present application sets the liquid inlet distributor 3 and the liquid outlet collector 4 outside the box 1, which is more conducive to the simultaneous entry of the heat exchange medium into multiple hexagonal heat storage rods 2 to participate in heat exchange. The embodiment of the present application uses inorganic phase change heat storage material to store heat, and uses the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel 6 to drive the hexagonal heat storage rod 2 to rotate, so that the rotating hexagonal heat storage rod 2 realizes heat exchange between the first heat exchange medium and the second heat exchange medium. The embodiment of the present application uses the heat exchange medium to drive the hexagonal heat storage rod 2 to rotate to avoid the phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod 2, effectively solving the problem of phase separation of the inorganic phase change heat storage material. The embodiment of the present application uses multiple straight flow channels to flow the first heat exchange medium, uses the heat exchange of the first heat exchange medium in the straight flow channel, and uses the kinetic energy generated by the second heat exchange medium falling from the top end to the bottom end of the hexagonal heat storage rod 2 to drive the hexagonal heat storage rod 2 to rotate, thereby solving the problem of phase separation.

[0073] Based on the above-mentioned heat exchange system based on inorganic phase change heat storage rod, please refer to Figure 4 and Figure 5 , preferably, a sealing structure 8 is arranged between each liquid inlet and outlet pipe 31 and the box 1, and between each liquid outlet branch pipe 41 and the box 1.

[0074] The embodiment of the present application sets the sealing structure 8 to avoid corrosion or pollution of the second heat exchange medium in the box 1 to the external space of the box 1.

[0075] Based on the above-mentioned heat exchange system based on inorganic phase change heat storage rod, please refer to Figure 4 and Figure 5 , preferably, a bearing 7 is installed between each liquid inlet and outlet pipe 31 and the hexagonal heat storage rod 2, and between each liquid outlet branch pipe 41 and the hexagonal heat storage rod 2.

[0076] The embodiment of the present application uses the bearing 7 to be installed between the liquid inlet and outlet pipe 31 and the hexagonal heat storage rod 2, and between the liquid outlet branch pipe 41 and the hexagonal heat storage rod 2, so that the liquid inlet and outlet pipe 31 and the liquid outlet branch pipe 41 do not rotate with the hexagonal heat storage rod 2.

[0077] Based on the above-mentioned heat exchange system based on inorganic phase change heat storage rod, please continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , preferably, the first heat exchange medium flow channel 5 includes an inlet header pipe, a distribution structure, multiple straight flow channels and a flow collection structure; the inlet header pipe is connected to the first liquid inlet, the flow collection structure is connected to the first liquid outlet, the multiple straight flow channels are located in the hexagonal heat storage rod 2, and the distribution structure and the flow collection structure are connected to the multiple straight flow channels.

[0078] Based on the above-mentioned heat exchange system based on inorganic phase change heat storage rod, please continue to refer toFigure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , preferably the cross section of the hexagonal heat storage rod 2 is hexagonal; each corner of the hexagon is connected to a circle; each corner of the hexagon is provided with a straight flow channel, and the bend of the straight flow channel is located at the circle of each corner; the middle top of the hexagon is provided with an inlet manifold, and the middle bottom of the hexagon is provided with an outlet manifold; the inlet manifold is connected to the first liquid inlet, and the outlet manifold is connected to the first liquid outlet; the inlet manifold is connected to the liquid inlet distributor 3, and the outlet manifold is connected to the liquid outlet collector 4.

[0079] Based on the above-mentioned heat exchange system based on inorganic phase change heat storage rod, please continue to refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , preferably the hexagonal heat storage rod 2 comprises a heat storage rod shell and an inorganic phase change heat storage material layer; the heat storage rod shell matches the shape of the hexagonal heat storage rod 2 and the first heat exchange medium flow channel 5; the inorganic phase change heat storage material layer is located in the heat storage rod shell.

[0080] Preferably, the hexagonal heat storage rod 2 of the embodiment of the present application comprises an inorganic phase change heat storage material layer, a heat-conducting wrapping layer, and a heat storage rod shell. The inorganic phase change heat storage material layer is the core part of the hexagonal heat storage rod 2, which is a material that undergoes a phase change process at a specific temperature and can absorb or release a large amount of heat during the phase change process, thereby achieving temperature regulation and stabilization through heat absorption or release. The heat-conducting wrapping layer is a layer of material wrapped around the phase change material to improve the heat-conducting performance of the phase change material, transfer heat into the phase change material, and release it to the environment. Common heat-conducting materials include nano-silicon dioxide, graphene, and nano-carbon. The heat storage rod shell is used to protect the inorganic phase change heat storage material from the environment inside the box 1, and also improves the stability and durability of the inorganic phase change heat storage material. The heat-conducting wrapping layer and the heat storage rod shell transfer heat from the heat source to the inorganic phase change heat storage material.

[0081] The embodiment of the present application uses inorganic phase change heat storage material to store heat, and uses the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel 6 to drive the hexagonal heat storage rod 2 to rotate, so that the rotating hexagonal heat storage rod 2 realizes heat exchange between the first heat exchange medium and the second heat exchange medium. The embodiment of the present application uses heat exchange medium to drive the hexagonal heat storage rod 2 to rotate to avoid phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod 2, effectively solving the problem of phase separation of the inorganic phase change heat storage material.

[0082] Based on the above-mentioned heat exchange system based on inorganic phase change heat storage rod, please continue to refer to Figure 1 ,Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Preferably, the first liquid inlet and the first liquid outlet are both arranged opposite to the straight-through flow channel of the hexagonal heat storage rod 2; and the second liquid inlet and the second liquid outlet are arranged at the corner of the box 1.

[0083] The embodiment of the present application also provides a manufacturing method of the inorganic phase change heat storage rod, comprising:

[0084] Step one, using a plastic blow molding process to prepare the heat storage rod shell.

[0085] The step one is specifically:

[0086] Step 11, extruding a hollow plastic tube, and cutting the hollow plastic tube according to the longitudinal length of the inorganic phase change heat storage rod to obtain a hollow tube preform.

[0087] More specifically, the step 11 comprises: feeding plastic particles into the hopper of the extruder, and extruding the hollow plastic tube in a semi-molten state; feeding the hollow plastic tube into a storage cylinder for heat preservation to prevent the hollow plastic tube from being deformed due to cooling; and cutting the hollow plastic tube according to the longitudinal length of the inorganic phase change heat storage rod to obtain a hollow tube preform.

[0088] Preferably, the material of the plastic particles is blow molding grade high-density polyethylene, glass fiber modified high-density polyethylene, polypropylene, glass fiber modified polypropylene or glass fiber modified thermoplastic polyurethane. The working temperature of the inorganic phase change heat storage rod blown by the blow molding grade high-density polyethylene is-100℃-80℃, the working temperature of the inorganic phase change heat storage rod blown by the glass fiber modified high-density polyethylene is-100℃-125℃, the working temperature of the inorganic phase change heat storage rod blown by the polypropylene is-30℃-100℃, the working temperature of the inorganic phase change heat storage rod blown by the glass fiber modified polypropylene is-30℃-150℃, and the working temperature of the inorganic phase change heat storage rod blown by the glass fiber modified thermoplastic polyurethane is-40℃-180℃.

[0089] The diameter of the hollow plastic tube in the embodiment of the present application is determined according to the circumference of the transverse cross section of the inorganic phase change heat storage rod, and the extrusion thickness of the hollow plastic tube in the embodiment of the present application is determined according to the required pressure bearing of the hollow channel of the inorganic phase change heat storage rod.

[0090] Step 12, placing the hollow tube preform between a left half mold and a right half mold matched with the shape of the inorganic phase change heat storage rod to be prepared, and closing the left half mold and the right half mold from bottom to top to ensure that the left half mold and the right half mold clamp the hollow tube preform.

[0091] More specifically, the step 12 comprises: preparing the left half mold and the right half mold of the inorganic phase change heat storage rod, and making the inner cavity formed by the left half mold and the right half mold to be matched with the shape of the inorganic phase change heat storage rod; after the hollow tube type blank is cut by the cutting device, the hollow tube type blank is quickly lowered to the center of the separated left half mold and the right half mold by using the storage cylinder; the left half mold and the right half mold are slowly closed until the hollow tube type blank is clamped by the left half mold and the right half mold; during the slow closing process, the lower part of the left half mold and the lower part of the right half mold first contact, then the middle part of the left half mold and the middle part of the right half mold contact, and finally the upper part of the left half mold and the upper part of the right half mold contact, and during the last closing stroke, the air in the cavity formed by the closing is discharged from the upper part.

[0092] The embodiment of the present application adopts the two half molds to be slowly closed at a certain speed, and the lower parts of the two half molds first contact, so that the air in the hollow part of the hollow channel type blank is kept at a certain pressure during the closing process, and part of the air in the cavity is discharged from the upper part during the last closing stroke, so that the hollow tube of the finished inorganic phase change heat storage rod does not adhere to the wall.

[0093] Step 13: high-pressure air is injected into the hollow tube type blank, the hollow tube type blank is expanded and uniformly formed along the cavity of the left half mold and the cavity of the right half mold, and a hollow heat storage rod shell is obtained after cooling.

[0094] More specifically, the step 13 comprises: connecting the inflation port to the upper outlet of the hollow tube type blank; high-pressure air is injected into the hollow tube type blank from the inflation port to blow and expand the hollow tube type blank to the shape of the closing inner cavity; the inflation pressure of the high-pressure air is between 0.2-0.7Mpa, the blow molding temperature of the hollow tube type blank is 80-280℃, and the blow molding time of the hollow tube type blank is kept at 10-45s; during the blow molding pressure maintaining process of the hollow tube type blank, the heat storage rod shell is quickly cooled by the mold, and the heat storage rod shell is gradually solidified during the cooling process; the high-pressure inflation head is removed from the inflation port, and the deflation of the heat storage rod shell is completed.

[0095] The inflation pressure of the embodiment of the present application is between 0.2-0.7Mpa, which is controlled as high as possible, and the blow molding temperature is 80-280℃, so as to ensure that the plastic is attached to the mold wall and the wall thickness of the hollow channel is uniform.

[0096] Please refer to the drawings, it is necessary to explain that the heat storage rod shell of the embodiment of the present application is a hexagonal cross-section heat storage rod; each corner of the hexagon is connected to a circle; each corner of the hexagon is provided with a serpentine flow channel, and the bending part of the serpentine flow channel is located at the circle of each corner. The middle part of the heat storage rod shell has a hollow channel, and the hollow section of the hollow channel is circular or elliptical: the diameter of the circular hollow section is 2-20mm, and the wall thickness is 0.3-3.0mm; the length of the major axis and the minor axis of the elliptical hollow section is 2-20mm, and the wall thickness is 0.3-3.0mm.

[0097] The embodiment of the present application adopts a plastic blow molding process to prepare the shell of the hexagonal heat storage rod, and after filling the inorganic phase change heat storage material into the shell through the filling port, the inorganic phase change heat storage rod is formed by sealing. The manufacturing process is simple, and it is beneficial to the efficient and large-scale manufacturing of the inorganic phase change heat storage device.

[0098] The plastic blow molding technology can be used to manufacture products of various shapes and sizes, and has strong plasticity. It is suitable for processing heat storage rod shells of various cross-sectional shapes and sizes. Moreover, the plastic blow molding technology is a one-time molding process, which has the advantage of high production efficiency.

[0099] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and they are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

[0100] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0101] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A heat exchange system based on an inorganic phase change heat storage rod, characterized in that, include: The housing and multiple hexagonal heat storage rods placed inside the housing; Multiple hexagonal heat storage rods are arranged in the housing; Each of the hexagonal heat storage rods includes: a heat storage rod shell prepared by plastic blow molding process; a filling port machined on the heat storage rod shell; a solid inorganic phase change heat storage material layer formed by injecting liquid inorganic phase change heat storage material into the inner cavity of the heat storage rod shell through the filling port; and a sealing structure covering the air injection port of the plastic blow molding process and sealing the filling port. The cross-section of the hexagonal heat storage rod is hexagonal; Each corner of the hexagon is connected to a circle; A straight flow channel is provided at each corner of the hexagon, and the bend of the straight flow channel is located in the circle of each corner; An inlet manifold is located at the top center of the hexagon; an outlet manifold is located at the bottom center of the hexagon. The inlet manifold is connected to the first liquid inlet, and the outlet manifold is connected to the first liquid outlet. The inlet manifold is connected to the liquid inlet distributor, and the outlet manifold is connected to the liquid outlet collector. The hexagonal heat storage rod is provided with a first heat exchange medium flow channel and a second heat exchange medium flow channel disposed in the box and exchanging heat with the hexagonal heat storage rod. The housing is equipped with an inlet distributor and an outlet concentrator. The inlet distributor includes a main inlet pipe and multiple inlet outlet pipes, and the outlet concentrator includes multiple outlet branch pipes and a main outlet pipe. Each of the hexagonal heat storage rods is connected to an inlet pipe and an outlet pipe; Bearings are installed between each liquid inlet / outlet pipe and the hexagonal heat storage rod, and between each liquid outlet branch pipe and the hexagonal heat storage rod.

2. The heat exchange system based on an inorganic phase change heat storage rod according to claim 1, characterized in that, A sealing structure is provided between each inlet / outlet pipe and the tank body, and between each outlet pipe and the tank body.

3. A heat exchange system based on an inorganic phase change heat storage rod according to claim 1, characterized in that, The first heat exchange medium flow channel includes an inlet main pipe, a branch structure, multiple straight-through channels, and a collection structure; The main inlet pipe is connected to the first liquid inlet, the flow collection structure is connected to the first liquid outlet, and multiple straight flow channels are located inside the hexagonal heat storage rod. Both the flow distribution structure and the flow collection structure are connected to multiple straight flow channels.

4. A heat exchange system based on an inorganic phase change heat storage rod according to claim 1, characterized in that, Both the first liquid inlet and the first liquid outlet are directly opposite the straight flow channel of the hexagonal heat storage rod; The second liquid inlet and the second liquid outlet are located at the corners of the box.

5. A heat exchange system based on an inorganic phase change heat storage rod according to claim 1, characterized in that, The heat storage rod shell is prepared using the following steps: Step 11: Extrude hollow plastic tubes. Cut the hollow plastic tubes according to the longitudinal length of the inorganic phase change heat storage rod to obtain hollow tube preforms. Step 12: Place the hollow tube blank between the left half mold and the right half mold that match the shape of the inorganic phase change heat storage rod. Close the left half mold and the right half mold from bottom to top to ensure that the left half mold and the right half mold clamp the hollow tube blank. Step 13: Inject high-pressure air into the hollow tube blank. The hollow tube blank expands and is uniformly formed along the cavity of the left half of the mold and the cavity of the right half of the mold. After cooling, a hollow heat storage rod shell is obtained.

6. A heat exchange system based on an inorganic phase change heat storage rod according to claim 5, characterized in that, Step 11 includes: Plastic particles are fed into the hopper of an extruder, and the plastic particles are extruded into hollow plastic tubes in a semi-molten state. The hollow plastic tube is placed into the storage cylinder for insulation to prevent it from cooling and deforming. Hollow plastic tubes are cut according to the longitudinal length of the inorganic phase change heat storage rod to obtain hollow tube preforms.

7. A heat exchange system based on an inorganic phase change heat storage rod according to claim 5, characterized in that, Step 12 includes: The left and right halves of the mold for preparing the inorganic phase change heat storage rod are made so that the inner cavity formed by the closing of the left and right halves of the mold is adapted to the outer shape of the inorganic phase change heat storage rod. After the cutting equipment cuts the hollow tube blank, the storage cylinder is used to quickly lower the hollow tube blank to the center of the separated left half mold and right half mold; The left and right halves of the mold are slowly closed until they clamp the hollow tube. During the slow closing process, the lower parts of the left and right halves of the mold first come into contact, then the middle parts of the left and right halves of the mold come into contact, and finally the upper parts of the left and right halves of the mold come into contact. During the final closing stroke, the air in the cavity formed by the mold closing is discharged from the top.

Images