CN116697793A - Heat exchange system based on inorganic phase change heat storage rod - Google Patents
Heat exchange system based on inorganic phase change heat storage rod Download PDFInfo
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- CN116697793A CN116697793A CN202310653087.1A CN202310653087A CN116697793A CN 116697793 A CN116697793 A CN 116697793A CN 202310653087 A CN202310653087 A CN 202310653087A CN 116697793 A CN116697793 A CN 116697793A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a heat exchange system based on an inorganic phase change heat storage rod, which comprises: the box body and a plurality of hexagonal heat storage rods placed in the box body; the plurality of hexagonal heat storage rods are arranged in the box body; each hexagonal heat storage rod comprises: preparing a heat storage rod shell and a filling port processed on the heat storage rod shell by adopting a plastic inflation forming process, and injecting a solid inorganic phase change heat storage material layer formed by liquid inorganic phase change heat storage materials into an inner cavity of the heat storage rod shell from the filling port; the filling opening covers the gas injection opening of the plastic inflation molding process and the sealing structure seals the filling opening. The shell of the hexagonal heat storage rod is prepared by adopting a plastic inflation molding process, and the inorganic phase change heat storage rod is formed by processing a filling port to fill inorganic phase change heat storage materials into the shell and then sealing the shell. The manufacturing process is simple, and is beneficial to the efficient large-scale manufacturing of the inorganic phase change heat accumulator.
Description
Technical Field
The invention relates to the technical field of medium heat exchange, in particular to a heat exchange system based on an inorganic phase change heat storage rod.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The inorganic phase change heat storage rod is used for storing and releasing heat energy by utilizing the heat capacity and the phase change latent heat of inorganic substances during phase change. The inorganic phase change heat storage rod generally comprises a cladding container and an inorganic filler filled in the cladding container, wherein the inorganic filler can be solid or liquid. Since the inorganic filler has a large heat capacity and latent heat of phase change, when storing heat energy, the inorganic filler absorbs heat and the temperature increases, thereby storing heat energy; when the inorganic filler releases heat energy, the temperature of the heat released by the filler is reduced, so that the stored heat energy is released.
When the inorganic phase change heat storage rod is manufactured, the heat range required to be stored and released by the inorganic filler is considered, and the shape of a proper coating container is selected according to the use environment requirement of the inorganic filler, so that the energy storage and release requirements of the heat storage rod during use are met.
The Chinese patent with publication number of CN108219753A discloses a preparation method and application of a self-heating bag, which mainly comprises a phase change material and a metal sheet, and the self-heating bag is suitable for the fields of local physiotherapy and health care only because the metal sheet needs to be manually broken to release seed crystals in metal gaps to trigger nucleation, and has large limitation.
In order to overcome the problem of larger limitation, the Chinese patent publication No. CN110173907A discloses a controllable phase change material bag, a preparation method and application thereof, and a metal plate or rod is firstly processed to obtain a controllable triggering metal electrode; and pouring the supersaturated phase change heat storage solution into stainless steel metal balls, inserting the controllable trigger metal electrodes and the conductive electrodes, packaging, and finally placing the package in a water bath for heat preservation to obtain the controllable phase change material package. Although the preparation process is simple, the method has the defect of low heat transfer efficiency.
In view of this, how to improve the heat transfer efficiency of the inorganic phase change heat accumulator is a technical problem to be solved.
Disclosure of Invention
The invention provides a heat exchange system based on inorganic phase change heat storage rods, wherein a plurality of hexagonal heat storage rods are simultaneously arranged in a box body, the plurality of hexagonal heat storage rods simultaneously participate in heat exchange to improve heat transfer efficiency, and the heat transfer efficiency is further improved by adopting a plastic inflation molding process to prepare the hexagonal heat storage rods.
The technical scheme for realizing the purpose of the invention is as follows:
a heat exchange system based on inorganic phase change heat storage rods, comprising: the box body and a plurality of hexagonal heat storage rods arranged in the box body; the plurality of hexagonal heat storage rods are arranged in the box body;
each hexagonal heat storage rod comprises: preparing a heat storage rod shell and a filling port processed on the heat storage rod shell by adopting a plastic inflation forming process, and injecting a solid inorganic phase change heat storage material layer formed by liquid inorganic phase change heat storage materials into an inner cavity of the heat storage rod shell from the filling port; the filling port covers an air injection port of a plastic inflation forming process and a sealing structure for sealing the filling port.
The invention adopts a plastic inflation molding process to prepare the shell of the hexagonal heat storage rod, and the inorganic phase change heat storage rod is formed by processing the filling opening to fill inorganic phase change heat storage materials into the shell and then sealing the shell. The manufacturing process is simple, and is beneficial to the efficient large-scale manufacturing of the inorganic phase change heat accumulator.
The inorganic phase change heat accumulator is generally formed by filling phase change materials (such as silicate or alumina and the like) into a container with high heat conductivity, solidifying the phase change materials into blocks or particles under proper conditions, and then assembling and packaging the phase change materials.
In one possible implementation manner, the hexagonal heat storage rod is internally provided with a first heat exchange medium flow channel, and a second heat exchange medium flow channel which is arranged in the box body and exchanges heat with the hexagonal heat storage rod;
the liquid inlet diverter comprises a liquid inlet main pipe and a plurality of liquid inlet outlet pipes, and the liquid outlet converging device comprises a plurality of liquid outlet branch pipes and a liquid outlet main pipe;
each hexagonal heat storage rod is communicated with a liquid inlet pipe and a liquid outlet pipe.
According to the invention, the liquid inlet flow divider and the liquid outlet converging device are arranged at the outer side of the box body, so that the synchronous entering of a heat exchange medium into a plurality of hexagonal heat storage rods to participate in heat exchange is facilitated. According to the invention, the inorganic phase change heat storage material is used for storing heat, and the hexagonal heat storage rod is driven to rotate by utilizing the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel, so that the rotating hexagonal heat storage rod can realize heat exchange between the first heat exchange medium and the second heat exchange medium. According to the invention, the heat exchange medium is adopted to drive the hexagonal heat storage rod to rotate, so that phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod is avoided, and the problem of phase separation of the inorganic phase change heat storage material is effectively solved. According to the invention, a plurality of through flow channels are adopted to flow the first heat exchange medium, the first heat exchange medium is utilized to exchange heat in the through flow channels, and kinetic energy generated in the process that the second heat exchange medium falls from the top end to the bottom end of the hexagonal heat storage rod drives the hexagonal heat storage rod to rotate, so that the phase change separation problem is solved.
In one possible implementation, a blocking structure is arranged between each liquid inlet pipe and the box body, and between each liquid outlet branch pipe and the box body.
The invention sets the blocking structure to avoid the corrosion of the second heat exchange medium in the box body or the pollution of the outer space of the box body.
In one possible implementation, bearings are installed between each liquid inlet pipe and the hexagonal heat storage rod, and between each liquid outlet branch pipe and the hexagonal heat storage rod.
The invention adopts the bearing to be arranged between the liquid inlet 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 outlet pipe and the liquid outlet branch pipe do not rotate along with the hexagonal heat storage rod.
In one possible implementation, the first heat exchange medium flow channel includes an inlet header, a flow dividing structure, a plurality of through flow channels, and a flow collecting structure;
the inlet header pipe is communicated with the first liquid inlet, the flow collecting structure is communicated with the first liquid outlet, the plurality of straight-through flow passages are positioned in the hexagonal heat storage rod, and the flow dividing structure and the flow collecting structure are communicated with the plurality of straight-through flow passages.
In one possible implementation, the hexagonal heat storage rod has a hexagonal cross section;
each corner of the hexagon is connected with a circle;
each corner of the hexagon is provided with a straight-through runner, and the bent part of the straight-through runner is positioned in the round shape of each corner;
an inlet main pipe is arranged at the top end of the hexagonal middle part, an outlet main pipe is arranged at the bottom end of the hexagonal middle part, the inlet main pipe is connected with a first liquid inlet, and the outlet main pipe is connected with a first liquid outlet;
the inlet main pipe is connected with the liquid inlet flow divider, and the outlet main pipe is connected with the liquid outlet converging device.
In one possible implementation, the hexagonal heat storage rod includes a heat storage rod housing and an inorganic phase change heat storage material layer;
the heat storage rod shell is matched with the shapes of the hexagonal heat storage rods and the first heat exchange medium flow channels; the inorganic phase change heat storage material layer is positioned in the heat storage rod shell.
Preferably, the hexagonal heat storage rod of the present invention comprises an inorganic phase change heat storage material layer, a thermally conductive wrap layer, and a heat storage rod housing. The inorganic phase change heat storage material layer is a core part of a hexagonal heat storage rod, is a material which undergoes a phase change process at a specific temperature, can absorb or release a large amount of heat in the phase change process, and realizes self temperature regulation and stabilization through heat absorption or heat release. The heat-conducting wrapping layer is a layer of material wrapped around the phase-change material for improving the heat-conducting properties of the phase-change material, transferring heat into the phase-change material, and releasing it into the environment. Common heat conducting materials include nano silicon dioxide, graphene, nano carbon and the like. The heat storage rod shell is used for protecting the inorganic phase change heat storage material from the influence of the environment in the box body, and can improve the stability and durability of the inorganic phase change heat storage material. The thermally conductive wrap and the thermal storage rod housing transfer heat from the heat source to the inorganic phase change thermal storage material.
According to the invention, the inorganic phase change heat storage material is used for storing heat, and the hexagonal heat storage rod is driven to rotate by utilizing the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel, so that the rotating hexagonal heat storage rod can realize heat exchange between the first heat exchange medium and the second heat exchange medium. According to the invention, the heat exchange medium is adopted to drive the hexagonal heat storage rod to rotate, so that phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod is avoided, and the problem of phase separation of the inorganic phase change heat storage material is effectively solved.
In one possible implementation manner, the first liquid inlet and the first liquid outlet are both opposite to the straight-through flow passage of the hexagonal heat storage rod;
the second liquid inlet and the second liquid outlet are formed in the corner of the box body.
In one possible implementation manner, the heat storage rod housing is prepared by adopting the following steps:
step 11, extruding a hollow plastic pipe, and cutting the hollow plastic pipe according to the longitudinal length of the prepared inorganic phase change heat storage rod to obtain a hollow pipe parison;
step 12, placing the hollow pipe parison between a left half-width die and a right half-width die which are matched with the shape of the inorganic phase change heat storage rod, and closing the left half-width die and the right half-width die from bottom to top to ensure that the left half-width die and the right half-width die clamp the hollow pipe parison;
and 13, injecting high-pressure air into the hollow pipe parison, expanding the hollow pipe parison, uniformly forming along the cavity of the left half-width die and the cavity of the right half-width die, and cooling to obtain the hollow heat storage rod shell.
The invention adopts plastic inflation molding technology to manufacture products with various shapes and sizes, and has strong plasticity. The method is suitable for processing the heat storage rod shells with various cross-sectional shapes and sizes. And the plastic inflation molding technology is one-step molding, and has the advantage of high production efficiency.
In one possible implementation, the step 11 includes:
feeding plastic particles into a hopper of an extruder, and extruding the plastic particles into hollow plastic pipes in a semi-molten state;
the hollow plastic pipe is sent into a storage cylinder for heat preservation so as to prevent the hollow plastic pipe from cooling and deforming;
and cutting the hollow plastic pipe according to the longitudinal length of the inorganic phase change heat storage rod to obtain a hollow pipe parison.
The diameter of the hollow plastic pipe is determined according to the perimeter of the transverse section of the manufactured inorganic phase change heat storage rod, and the extrusion thickness of the hollow plastic pipe is determined according to the pressure bearing required by the hollow channel of the manufactured inorganic phase change heat storage rod.
In one possible implementation, the step 12 includes:
preparing a left half-width die and a right half-width die of the inorganic phase-change heat storage rod, and enabling an inner cavity formed by die assembly of the left half-width die and the right half-width die to be matched with the shape of the inorganic phase-change heat storage rod;
after the intercepting equipment intercepts the hollow pipe parison, a storage cylinder is adopted to quickly descend the hollow pipe parison to the centers of a left half-width die and a right half-width die which are separated;
slowly closing the left half-width die and the right half-width die until the left half-width die and the right half-width die clamp the hollow tube; in the slow die assembly process, the lower part of the left half-width die is contacted with the lower part of the right half-width die firstly, then the middle part of the left half-width die is contacted with the middle part of the right half-width die, finally the upper part of the left half-width die is contacted with the upper part of the right half-width die, and in the final die assembly process, air in a cavity formed by die assembly is discharged from the upper part.
The invention adopts the two half molds to slowly mold at a certain speed, and the lower edges of the two half molds are contacted first, so that the hollow part air of the hollow channel parison is ensured to keep a certain pressure in the mold closing process, and meanwhile, part of air in the cavity is discharged from the upper part in the final mold closing stroke, so that the hollow pipe pair walls of the finished inorganic phase change heat storage rod are ensured not to be mutually adhered.
In one possible implementation, the step 13 includes:
an air charging port is connected to the upper outlet of the hollow pipe parison;
injecting high-pressure air into the hollow pipe parison from the air charging port for inflation, so that the hollow pipe parison reaches the shape of a die closing inner cavity; the inflation pressure of the high-pressure air is between 0.2 and 0.7Mpa, the blow molding temperature of the hollow tube parison is 80 to 280 ℃, and the blow-up time of the hollow tube parison is kept between 10 and 45s;
in the blowing and pressure maintaining process of the hollow pipe parison, the heat storage rod shell rapidly dissipates heat through a die, and the heat storage rod shell is gradually solidified and shaped in the cooling process;
and removing the high-pressure inflation head from the inflation inlet to complete the deflation of the heat storage rod shell.
The inflation pressure of the invention is between 0.2 and 0.7Mpa, the inflation pressure is controlled at high pressure as much as possible, the blow molding temperature is 80 to 280 ℃, the adhesion of plastic and the mold wall is ensured, and the wall thickness of the hollow channel is uniform.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a plastic inflation molding process to prepare the shell of the hexagonal heat storage rod, and the inorganic phase change heat storage rod is formed by processing the filling opening to fill inorganic phase change heat storage materials into the shell and then sealing the shell. The method has the advantages of simple manufacturing process and contribution to efficient large-scale manufacturing of the inorganic phase change heat accumulator.
Drawings
FIG. 1 is a schematic diagram of a heat exchange system based on an inorganic phase change heat storage rod;
FIG. 2 is a schematic representation of a first heat exchange medium flow module provided by the present invention;
FIG. 3 is a schematic diagram II of a heat exchange system based on an inorganic phase change heat storage rod;
FIG. 4 is an enlarged partial view of portion A of FIG. 3;
FIG. 5 is an enlarged partial view of portion B of FIG. 3;
FIG. 6 is a diagram of a hexagonal heat storage rod structure provided by the invention;
1-a box body; 2-hexagonal heat storage rod; 3-a liquid inlet diverter; 31-a liquid inlet pipe; 32-a liquid inlet main pipe; 4-a liquid outlet collector; 41-liquid outlet branch pipes; 42-a liquid outlet main pipe; 5-a first heat exchange medium flow passage; 6-a second heat exchange medium flow passage; 7-a bearing; 8-plugging structure.
Detailed Description
The present invention will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present invention, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present invention by those skilled in the art.
The manufacturing difficulties of the inorganic phase change heat storage rod include the following aspects: (1) selection of phase change materials: the inorganic phase change materials are various, and the selection of materials with the characteristics of high heat storage density, good stability, easy melting and the like is the primary difficulty in manufacturing inorganic phase change heat storage rods. (2) coating of phase change material: the phase change material is not readily in contact with the heat transfer medium, so it is necessary to encapsulate the phase change material in a suitable material so that it is in contact with the heat transfer medium. But the selection of the coating material and the control of the coating process need to overcome certain technical difficulties. And (3) designing and processing a heat storage rod: the physical properties and the thermal durability of the heat storage rod can be affected in the aspects of reasonable design, meeting the requirements of the shape, high processing precision, good surface finish and the like, and the heat storage rod is also a key technical problem to be solved in manufacturing the inorganic phase change heat storage rod. (4) optimization of Heat transfer Performance: in order to improve the heat transfer efficiency of the heat storage rod, the selection and the consumption of a heat transfer medium, a heat transfer structure with reasonable design and the like are required to be optimized. These aspects require constant experimentation and improvement to achieve optimal heat transfer performance. (5) stability of product quality: the manufacturing of the inorganic phase change heat storage rod also needs to control the stability of the production process, and ensures the consistency of the performance and quality of the product in mass production.
The coating of the inorganic phase change material can improve the stability, the controllability and the cycle life of the inorganic phase change material, and is a key technology applied to energy storage. In the manufacturing process, the key points are as follows: (1) selecting a suitable coating material: the cladding material needs to be compatible with the phase change material and have good thermal conductivity, chemical stability, mechanical strength and other characteristics. (2) realizing controllable coating thickness: the proper coating thickness can enhance the stability and cycle life of the phase change material while ensuring that the coating has as little effect as possible on the phase change material. (3) The interface problem between the phase change material and the coating layer is solved: the interface is easy to generate stress concentration, chemical reaction and other problems, and the performance and stability of the phase change material can be affected. (4) realizing 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 mass production is an important difficulty.
Based on this, the embodiment of the invention provides a heat exchange system based on an inorganic phase change heat storage rod, please refer to fig. 1, 2, 3 and 6, which includes: the heat storage box comprises a box body 1 and a plurality of hexagonal heat storage rods 2 arranged in the box body 1; a plurality of hexagonal heat accumulating rods 2 are arranged in the box body 1; each hexagonal heat storage rod 2 includes: preparing a heat storage rod shell and a filling port processed on the heat storage rod shell by adopting a plastic inflation forming process, and injecting a solid inorganic phase change heat storage material layer formed by liquid inorganic phase change heat storage materials into an inner cavity of the heat storage rod shell from the filling port; the filling opening covers the gas injection opening of the plastic inflation molding process and the sealing structure seals the filling opening.
According to the embodiment of the invention, the shell of the hexagonal heat storage rod 2 is prepared by adopting a plastic inflation molding process, and the inorganic phase change heat storage rod is formed by processing a filling port to fill inorganic phase change heat storage materials into the shell and then sealing the inorganic phase change heat storage materials. The manufacturing process is simple, and is beneficial to the efficient large-scale manufacturing of the inorganic phase change heat accumulator.
The inorganic phase change heat accumulator of the embodiment of the invention is generally formed by filling phase change materials (such as silicate or alumina and the like) into a container with high heat conductivity, solidifying the phase change materials into blocks or particles under proper conditions, and then assembling and packaging the phase change materials.
Based on the above-mentioned heat exchange system based on the inorganic phase change heat storage rod, with continued reference to fig. 1, 2, 3 and 6, preferably, the hexagonal heat storage rod 2 is provided with a first heat exchange medium flow channel 5 therein, and a second heat exchange medium flow channel 6 disposed in the case 1 and exchanging heat with the hexagonal heat storage rod 2; the liquid inlet diverter 3 and the liquid outlet collector 4 are arranged on the box body 1, the liquid inlet diverter 3 comprises a liquid inlet main pipe 32 and a plurality of liquid inlet 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 inlet pipe 31 and one liquid outlet branch pipe 41.
According to the embodiment of the invention, the liquid inlet flow divider 3 and the liquid outlet collector 4 are arranged on the outer side of the box body 1, so that the synchronous entering of a heat exchange medium into a plurality of hexagonal heat storage rods 2 to participate in heat exchange is facilitated. According to the embodiment of the invention, the inorganic phase change heat storage material is adopted for heat storage, and the hexagonal heat storage rod 2 is driven to rotate by the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel 6, so that the rotating hexagonal heat storage rod 2 realizes heat exchange between the first heat exchange medium and the second heat exchange medium. According to the embodiment of the invention, the hexagonal heat storage rod 2 is driven to rotate by the heat exchange medium, so that the phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod 2 is avoided, and the problem of the phase separation of the inorganic phase change heat storage material is effectively solved. According to the embodiment of the invention, a plurality of through flow channels are adopted to flow the first heat exchange medium, the first heat exchange medium is utilized to exchange heat in the through flow channels, and kinetic energy generated in the process that the second heat exchange medium falls from the top end to the bottom end of the hexagonal heat storage rod 2 drives the hexagonal heat storage rod 2 to rotate, so that the phase change separation problem is solved.
Based on the above-mentioned heat exchange system based on the inorganic phase change heat storage rod, referring to fig. 4 and 5, it is preferable that a plugging structure 8 is disposed between each liquid inlet pipe 31 and the case 1, and between each liquid outlet branch pipe 41 and the case 1.
The plugging structure 8 is arranged in the embodiment of the invention to avoid the corrosion of the second heat exchange medium in the box body 1 or the pollution of the external space of the box body 1.
Based on the above-mentioned heat exchange system based on the inorganic phase change heat storage rod, referring to fig. 4 and 5, it is preferable that bearings 7 are installed between each liquid inlet pipe 31 and the hexagonal heat storage rod 2, and between each liquid outlet branch pipe 41 and the hexagonal heat storage rod 2.
In the embodiment of the invention, the bearing 7 is arranged between the liquid inlet 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 pipe 31 and the liquid outlet branch pipe 41 do not rotate along with the hexagonal heat storage rod 2.
Based on the heat exchange system based on the inorganic phase change heat storage rod, with continued reference to fig. 1, 2, 3, 4, 5 and 6, it is preferable that the first heat exchange medium flow channel 5 includes an inlet manifold, a flow dividing structure, a plurality of through flow channels and a flow collecting structure; the inlet header pipe is communicated with the first liquid inlet, the flow collecting structure is communicated with the first liquid outlet, a plurality of through flow channels are positioned in the hexagonal heat storage rod 2, and the flow distributing structure and the flow collecting structure are communicated with the plurality of through flow channels.
Based on the heat exchange system based on the inorganic phase change heat storage rod, please continue to refer to fig. 1, 2, 3, 4, 5 and 6, preferably the hexagonal heat storage rod 2 has a hexagonal cross section; each corner of the hexagon is connected with a circle; each corner of the hexagon is provided with a straight-through runner, and the bent part of the straight-through runner is positioned in the round shape of each corner; an inlet main pipe is arranged at the top end of the hexagonal middle part, an outlet main pipe is arranged at the bottom end of the hexagonal middle part, the inlet main pipe is connected with a first liquid inlet, and the outlet main pipe is connected with a first liquid outlet; the inlet main pipe is connected with the liquid inlet flow divider 3, and the outlet main pipe is connected with the liquid outlet collector 4.
Based on the above-mentioned heat exchange system based on the inorganic phase change heat storage rod, please continue to refer to fig. 1, 2, 3, 4, 5 and 6, preferably the hexagonal heat storage rod 2 includes a heat storage rod housing and an inorganic phase change heat storage material layer; the heat storage rod shell is matched with the shapes of the hexagonal heat storage rods 2 and the first heat exchange medium flow channels 5; the inorganic phase change heat storage material layer is positioned in the heat storage rod shell.
The hexagonal heat storage rod 2 of the preferred embodiment of the present invention includes an inorganic phase change heat storage material layer, a thermally conductive wrap layer, and a heat storage rod housing. The inorganic phase change heat storage material layer is a core part of the hexagonal heat storage rod 2, is a material which undergoes a phase change process at a specific temperature, can absorb or release a large amount of heat in the phase change process, and realizes self temperature regulation and stabilization through heat absorption or heat release. The heat-conducting wrapping layer is a layer of material wrapped around the phase-change material for improving the heat-conducting properties of the phase-change material, transferring heat into the phase-change material, and releasing it into the environment. Common heat conducting materials include nano silicon dioxide, graphene, nano carbon and the like. The heat storage rod shell is used for protecting the inorganic phase change heat storage material from the influence of the environment in the box body 1, and meanwhile, the stability and the durability of the inorganic phase change heat storage material can be improved. The thermally conductive wrap and the thermal storage rod housing transfer heat from the heat source to the inorganic phase change thermal storage material.
According to the embodiment of the invention, the inorganic phase change heat storage material is adopted for heat storage, and the hexagonal heat storage rod 2 is driven to rotate by the kinetic energy of the second heat exchange medium flowing in the second heat exchange medium flow channel 6, so that the rotating hexagonal heat storage rod 2 realizes heat exchange between the first heat exchange medium and the second heat exchange medium. According to the embodiment of the invention, the hexagonal heat storage rod 2 is driven to rotate by the heat exchange medium, so that the phase separation of the inorganic phase change heat storage material in the hexagonal heat storage rod 2 is avoided, and the problem of the phase separation of the inorganic phase change heat storage material is effectively solved.
Based on the heat exchange system based on the inorganic phase change heat storage rod, please continue to refer to fig. 1, 2, 3, 4, 5 and 6, preferably, the first liquid inlet and the first liquid outlet are both opposite to the through flow channel of the hexagonal heat storage rod 2; the second liquid inlet and the second liquid outlet are arranged at the corners of the box body 1.
The embodiment of the invention also provides a manufacturing method of the inorganic phase change heat storage rod, which comprises the following steps:
and step one, preparing the heat storage rod shell by adopting a plastic inflation forming process.
The first step is specifically as follows:
and 11, extruding the hollow plastic pipe, and cutting the hollow plastic pipe according to the longitudinal length of the prepared inorganic phase change heat storage rod to obtain a hollow pipe parison.
More specifically, this step 11 includes: feeding plastic particles into a hopper of an extruder, and extruding the plastic particles into hollow plastic pipes in a semi-molten state; the hollow plastic pipe is sent into a storage cylinder for heat preservation so as to prevent the hollow plastic pipe from cooling and deforming; and cutting the hollow plastic pipe according to the longitudinal length of the inorganic phase change heat storage rod to obtain a hollow pipe parison.
The plastic particles of the embodiment of the invention are preferably made of blow molding high-density polyethylene, glass fiber modified high-density polyethylene, polypropylene, glass fiber modified polypropylene or glass fiber modified thermoplastic polyurethane. Wherein the working temperature of the blow-molded high-density polyethylene blown into the inorganic phase-change heat storage rod is-100 ℃ to 80 ℃, the working temperature of the glass fiber modified high-density polyethylene blown into the inorganic phase-change heat storage rod is-100 ℃ to 125 ℃, the working temperature of the polypropylene blown into the inorganic phase-change heat storage rod is-30 ℃ to 100 ℃, the working temperature of the glass fiber modified polypropylene blown into the inorganic phase-change heat storage rod is-30 ℃ to 150 ℃, and the working temperature of the glass fiber modified thermoplastic polyurethane blown into the inorganic phase-change heat storage rod is-40 ℃ to 180 ℃.
The diameter of the hollow plastic pipe in the embodiment of the invention is determined according to the perimeter of the transverse section of the manufactured inorganic phase change heat storage rod, and the extrusion thickness of the hollow plastic pipe in the embodiment of the invention is determined according to the pressure bearing required by the hollow channel of the manufactured inorganic phase change heat storage rod.
And 12, placing the hollow pipe parison between a left half-width die and a right half-width die which are matched with the shape of the inorganic phase change heat storage rod, and clamping the left half-width die and the right half-width die from bottom to top to ensure that the left half-width die and the right half-width die clamp the hollow pipe parison.
More specifically, this step 12 comprises: preparing a left half-width die and a right half-width die of the inorganic phase-change heat storage rod, and enabling an inner cavity formed by die assembly of the left half-width die and the right half-width die to be matched with the shape of the inorganic phase-change heat storage rod; after the intercepting equipment intercepts the hollow pipe parison, a storage cylinder is adopted to quickly descend the hollow pipe parison to the centers of a left half-width die and a right half-width die which are separated; slowly closing the left half-width die and the right half-width die until the left half-width die and the right half-width die clamp the hollow tube; in the slow die assembly process, the lower part of the left half-width die is contacted with the lower part of the right half-width die firstly, then the middle part of the left half-width die is contacted with the middle part of the right half-width die, finally the upper part of the left half-width die is contacted with the upper part of the right half-width die, and in the final die assembly process, air in a cavity formed by die assembly is discharged from the upper part.
According to the embodiment of the invention, the two half molds are adopted to be slowly clamped at a certain speed, the lower edges of the two half molds are contacted first, so that the hollow part air of the hollow channel parison is ensured to keep a certain pressure in the clamping process, meanwhile, part of air in the hollow cavity is discharged from the upper part in the final clamping stroke, and the hollow pipe pair walls of the finished inorganic phase change heat storage rod are ensured not to be mutually bonded.
And 13, injecting high-pressure air into the hollow pipe parison, expanding the hollow pipe parison, uniformly forming along the cavity of the left half-width die and the cavity of the right half-width die, and cooling to obtain the hollow heat storage rod shell.
More specifically, this step 13 includes: an air charging port is connected to the upper outlet of the hollow pipe parison; injecting high-pressure air into the hollow pipe parison from the air charging port for inflation, so that the hollow pipe parison reaches the shape of the die assembly inner cavity; the inflation pressure of the high-pressure air is between 0.2 and 0.7Mpa, the blow molding temperature of the hollow tube parison is 80 to 280 ℃, and the blow-up time of the hollow tube parison is kept between 10 and 45 seconds; in the blowing-up and pressure-maintaining process of the hollow pipe parison, the heat storage rod shell rapidly dissipates heat through a die, and the heat storage rod shell is gradually solidified and shaped in the cooling process; and removing the high-pressure inflation head from the inflation inlet to complete the deflation of the heat storage rod shell.
The inflation pressure of the embodiment of the invention is between 0.2 and 0.7Mpa, the inflation pressure is controlled at high pressure as much as possible, the blow molding temperature is 80 to 280 ℃, the adhesion of plastic and the mold wall is ensured, and the wall thickness of the hollow channel is uniform.
Referring to the drawings, it should be noted that, in the embodiment of the present invention, the heat storage rod housing is a heat storage rod with a hexagonal cross section; each corner of the hexagon is connected with a circle; each corner of the hexagon is provided with a snake-shaped flow passage, and the bending part of the snake-shaped flow passage is positioned in the round shape of each corner. The middle part of the heat storage rod shell is provided with a hollow channel, and the hollow section of the hollow channel is round or oval: 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 elliptic hollow section is 2-20mm, and the wall thickness is 0.3-3.0mm.
According to the embodiment of the invention, the shell of the hexagonal heat storage rod is prepared by adopting a plastic inflation molding process, and the inorganic phase change heat storage rod is formed by processing a filling port to fill inorganic phase change heat storage materials into the shell and then sealing the inorganic phase change heat storage materials. The manufacturing process is simple, and is beneficial to the efficient large-scale manufacturing of the inorganic phase change heat accumulator.
The embodiment of the invention adopts a plastic inflation molding technology to manufacture products with various shapes and sizes, and has strong plasticity. The method is suitable for processing the heat storage rod shells with various cross-sectional shapes and sizes. And the plastic inflation molding technology is one-step molding, and has the advantage of high production efficiency.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A heat exchange system based on inorganic phase change heat storage rods, comprising: the box body and a plurality of hexagonal heat storage rods arranged in the box body; the plurality of hexagonal heat storage rods are arranged in the box body;
each hexagonal heat storage rod comprises: preparing a heat storage rod shell and a filling port processed on the heat storage rod shell by adopting a plastic inflation forming process, and injecting a solid inorganic phase change heat storage material layer formed by liquid inorganic phase change heat storage materials into an inner cavity of the heat storage rod shell from the filling port; the filling port covers an air injection port of a plastic inflation forming process and a sealing structure for sealing the filling port.
2. The heat exchange system based on inorganic phase change heat storage rods according to claim 1, wherein a first heat exchange medium flow channel is arranged in the hexagonal heat storage rods, and a second heat exchange medium flow channel is arranged in the box body and exchanges heat with the hexagonal heat storage rods;
the liquid inlet diverter comprises a liquid inlet main pipe and a plurality of liquid inlet outlet pipes, and the liquid outlet converging device comprises a plurality of liquid outlet branch pipes and a liquid outlet main pipe;
each hexagonal heat storage rod is communicated with a liquid inlet pipe and a liquid outlet pipe.
3. The heat exchange system based on the inorganic phase change heat storage rod according to claim 2, wherein a plugging structure is arranged between each liquid inlet pipe and the box body and between each liquid outlet branch pipe and the box body.
4. The heat exchange system based on inorganic phase change heat storage rods according to claim 2, wherein bearings are arranged between each liquid inlet pipe and the hexagonal heat storage rod, and between each liquid outlet branch pipe and the hexagonal heat storage rod.
5. The heat exchange system based on inorganic phase change heat storage rods as claimed in claim 1, wherein the first heat exchange medium flow channel comprises an inlet manifold, a flow dividing structure, a plurality of through flow channels and a flow collecting structure;
the inlet header pipe is communicated with the first liquid inlet, the flow collecting structure is communicated with the first liquid outlet, the plurality of straight-through flow passages are positioned in the hexagonal heat storage rod, and the flow dividing structure and the flow collecting structure are communicated with the plurality of straight-through flow passages.
6. The heat exchange system based on inorganic phase change heat storage rods according to claim 1, wherein the hexagonal heat storage rods have a hexagonal cross section;
each corner of the hexagon is connected with a circle;
each corner of the hexagon is provided with a straight-through runner, and the bent part of the straight-through runner is positioned in the round shape of each corner;
an inlet main pipe is arranged at the top end of the hexagonal middle part, an outlet main pipe is arranged at the bottom end of the hexagonal middle part, the inlet main pipe is connected with a first liquid inlet, and the outlet main pipe is connected with a first liquid outlet;
the inlet main pipe is connected with the liquid inlet flow divider, and the outlet main pipe is connected with the liquid outlet converging device.
7. The heat exchange system based on the inorganic phase change heat storage rod according to claim 1, wherein the first liquid inlet and the first liquid outlet are opposite to the straight-through flow passage of the hexagonal heat storage rod;
the second liquid inlet and the second liquid outlet are formed in the corner of the box body.
8. The heat exchange system based on inorganic phase change heat storage rods as claimed in claim 1, wherein the heat storage rod shell is prepared by the following steps:
step 11, extruding a hollow plastic pipe, and cutting the hollow plastic pipe according to the longitudinal length of the prepared inorganic phase change heat storage rod to obtain a hollow pipe parison;
step 12, placing the hollow pipe parison between a left half-width die and a right half-width die which are matched with the shape of the inorganic phase change heat storage rod, and closing the left half-width die and the right half-width die from bottom to top to ensure that the left half-width die and the right half-width die clamp the hollow pipe parison;
and 13, injecting high-pressure air into the hollow pipe parison, expanding the hollow pipe parison, uniformly forming along the cavity of the left half-width die and the cavity of the right half-width die, and cooling to obtain the hollow heat storage rod shell.
9. The heat exchange system based on an inorganic phase change heat storage rod according to claim 8, wherein the step 11 comprises:
feeding plastic particles into a hopper of an extruder, and extruding the plastic particles into hollow plastic pipes in a semi-molten state;
the hollow plastic pipe is sent into a storage cylinder for heat preservation so as to prevent the hollow plastic pipe from cooling and deforming;
and cutting the hollow plastic pipe according to the longitudinal length of the inorganic phase change heat storage rod to obtain a hollow pipe parison.
10. The heat exchange system according to claim 8, wherein the step 12 includes:
preparing a left half-width die and a right half-width die of the inorganic phase-change heat storage rod, and enabling an inner cavity formed by die assembly of the left half-width die and the right half-width die to be matched with the shape of the inorganic phase-change heat storage rod;
after the intercepting equipment intercepts the hollow pipe parison, a storage cylinder is adopted to quickly descend the hollow pipe parison to the centers of a left half-width die and a right half-width die which are separated;
slowly closing the left half-width die and the right half-width die until the left half-width die and the right half-width die clamp the hollow tube; in the slow die assembly process, the lower part of the left half-width die is contacted with the lower part of the right half-width die firstly, then the middle part of the left half-width die is contacted with the middle part of the right half-width die, finally the upper part of the left half-width die is contacted with the upper part of the right half-width die, and in the final die assembly process, air in a cavity formed by die assembly is discharged from the upper part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310653087.1A CN116697793A (en) | 2023-06-05 | 2023-06-05 | Heat exchange system based on inorganic phase change heat storage rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310653087.1A CN116697793A (en) | 2023-06-05 | 2023-06-05 | Heat exchange system based on inorganic phase change heat storage rod |
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| CN202310653087.1A Pending CN116697793A (en) | 2023-06-05 | 2023-06-05 | Heat exchange system based on inorganic phase change heat storage rod |
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| CN (1) | CN116697793A (en) |
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