Adjustable heat pipe phase change heat storage device

Abstract

The utility model provides an adjustable heat pipe phase change heat storage device. The adjustable heat pipe phase change heat storage device comprises a shell, a main pipeline, a phase change heat storage material and a plurality of pull rod heat pipe assemblies. The main pipeline is arranged in the axial center of the shell and used for allowing fluid of the heat collector to flow. The space defined by the outer side wall of the main pipeline and the inner side wall of the shell is filled with the phase change heat storage material, and the phase change heat storage material is used for absorbing heat from the fluid for storage during heat storage and is used for transferring the heat to the fluid during heat release; the multiple pull rod heat pipe assemblies are arranged in the phase change heat storage material and used for transferring heat between the fluid and the phase change heat storage material. According to the adjustable heat pipe phase change heat storage device, the heating uniformity of the phase change heat storage medium can be improved, and the heat exchange efficiency of the phase change heat storage medium is improved.

Description

Technical Field

[0001] This utility model relates to the field of thermal storage equipment, specifically, to an adjustable heat pipe phase change thermal storage device. Background Technology

[0002] Solar energy is a clean, pollution-free renewable energy source, and its thermal utilization takes many forms. Among these, indoor solar thermal utilization equipment mainly includes solar water heaters and solar heating equipment. However, solar energy is characterized by intermittency and instability, making the design of an energy storage and extraction device particularly important. Phase change thermal storage is an energy storage technology based on phase change energy storage materials, featuring constant temperature and high heat storage density.

[0003] For example, the utility model patent with authorization announcement number CN220601600U discloses a household multifunctional solar pulsating heat pipe heating device. The system consists of four main components: a solar collector, a storage bracket, flexible pipes, and a multifunctional heat-using plate. The core components of the solar collector are a foamed copper absorber-coated composite plate and a metal heat-absorbing plate. The upper surface of the foamed copper absorber-coated composite plate is coated with a selective absorption coating. The metal heat-absorbing plate has a honeycomb mesh structure for holding the heat storage medium and embeds serpentine pulsating heat pipe channels as the evaporation section of the pulsating heat pipe. This household multifunctional solar pulsating heat pipe heating device adopts a combined structure of separate pulsating heat pipes and composite heat storage medium. Compared with traditional solar heating devices, it has advantages such as high efficiency in heat absorption, heat transfer, and heat storage, compact structure, flexible layout, diverse uses, and on-demand heating. However, in the disclosed structure, the phase change heat storage medium exhibits uneven heating and slow heat exchange in areas far from the flexible pipes. Utility Model Content

[0004] In order to improve the heating uniformity of the phase change heat storage medium and accelerate the heat exchange efficiency of the phase change heat storage medium, the technical solution adopted by this utility model is: an adjustable heat pipe phase change heat storage device, including a shell, a main pipe, a phase change heat storage material and several tie rod heat pipe assemblies.

[0005] The main pipe is located at the axial center of the outer shell and is used to supply fluid flow to the solar collector;

[0006] The phase change thermal storage material is filled in the space enclosed by the outer wall of the main pipe and the inner wall of the outer shell, and is used to absorb heat from the fluid for storage during heat storage, and to transfer heat to the fluid during heat release.

[0007] Several of the aforementioned tie rod heat pipe assemblies are disposed within the phase change thermal storage material, and the tie rod heat pipe assemblies are used to transfer heat between the fluid and the phase change thermal storage material.

[0008] Based on the above, in order to facilitate changing the angle and accelerate the heat exchange speed and efficiency, each of the pull rod heat pipe assemblies includes a pair of pull rods and several heat pipes. The two ends of the several heat pipes are respectively hinged to the corresponding pull rods. The pull rods are used to change the tilt angle of the heat pipes in the phase change thermal storage material by synchronously pulling the several heat pipes.

[0009] Several of the heat pipes are filled with wicks, and the wicks are filled with a working medium.

[0010] Based on the above, in order to increase the uniformity of heat exchange, several of the aforementioned tie rod heat pipe assemblies are arranged in a ring array along the outer side wall of the main pipe.

[0011] Based on the above, the pull rod heat pipe assembly is arranged along the axial direction of the main pipe.

[0012] Based on the above, in order to facilitate pulling the lever, one end of the lever is extended out of the main pipe.

[0013] Based on the above, in order to reduce heat loss, the outer shell is wrapped with an insulation layer.

[0014] Based on the above, for ease of installation and maintenance, several of the aforementioned tie rod heat pipe assemblies have the same specifications.

[0015] Based on the above, in the heat storage state, the inclination angles of the several heat pipes are the same; in the heat release state, the inclination angles of the several heat pipes are the same.

[0016] This utility model has substantial features and progress compared to the prior art. Specifically, the adjustable heat pipe phase change heat storage device provided by this utility model wraps a phase change heat storage material around the main pipe, sets a number of uniformly distributed heat pipes inside the phase change heat storage material, and fills the heat pipes with heat absorption cores and working medium. In this way, the working medium inside the heat pipes can be used to exchange heat with the phase change heat storage material far away from the main pipe, thereby improving the heating uniformity and heat exchange efficiency of the phase change heat storage material.

[0017] Furthermore, by hinged the outer ends of multiple heat pipes to the pull rod, the tilt angle of the heat pipes can be changed by pulling the pull rod, which further improves the heat exchange between the fluid inside and outside the main pipe. It also enables timely control of the evaporation or condensation process of the phase change thermal storage material, greatly improving the working efficiency of the thermal storage device.

[0018] Furthermore, multiple heat pipes are evenly distributed in a ring along the outside of the main pipe, thereby further reducing problems such as uneven heating and high flow resistance that occur during the heating and melting process of phase change heat storage materials such as paraffin and molten salt. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of an adjustable heat pipe phase change thermal storage device provided by this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of an adjustable heat pipe phase change thermal storage device provided by this utility model.

[0021] Figure 3 This is a schematic diagram showing the connection relationship between an adjustable heat pipe phase change heat storage device and a collector provided by this utility model.

[0022] Figure 4 This is a schematic diagram of the phase change heat storage material in an adjustable heat pipe phase change heat storage device provided by this utility model during the heat release process.

[0023] Figure 5 This is a schematic diagram of the phase change heat storage material in an adjustable heat pipe phase change heat storage device provided by this utility model during the heat storage process.

[0024] In the diagram: 1. Main pipe; 2. Heat pipe; 3. Tie rod; 4. Outer shell; 5. Liquid wick; 6. Phase change thermal storage material; 7. Heat user; 8. Heat exchange equipment; 9. First valve; 10. Second valve; 11. Third valve; 12. Heat collector. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0026] Example 1

[0027] This embodiment provides an adjustable heat pipe phase change thermal storage device, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes an outer shell 4, a main pipe 1, a phase change thermal storage material 6, and several tie rod heat pipe assemblies. The main pipe 1 is located at the axial center of the outer shell 4 and is used to supply fluid flow to the collector 12.

[0028] The phase change thermal storage material 6 is filled in the space enclosed by the outer wall of the main pipe 1 and the inner wall of the outer shell 4, and is used to absorb heat from the fluid for storage during heat storage, and to transfer heat to the fluid during heat release.

[0029] Several of the aforementioned tie rod heat pipe assemblies are disposed within the phase change thermal storage material 6, and the tie rod heat pipe assemblies are used to transfer heat between the fluid and the phase change thermal storage material.

[0030] Specifically, such as Figure 2As shown, to facilitate angle changes and accelerate heat exchange speed and efficiency, each of the pull rod heat pipe assemblies includes a pair of pull rods 3 and several heat pipes 2. The two ends of the heat pipes 2 are respectively hinged to the corresponding pull rods 3, and the pull rods 3 are used to change the tilt angle of the heat pipes 2 within the phase change thermal storage material by synchronously pulling the heat pipes 2.

[0031] Each of the heat pipes is filled with a liquid wick 5, and the liquid wick 5 is filled with a working medium. Specifically, in the heat storage state, the inclination angles of the heat pipes 2 are the same; in the heat release state, the inclination angles of the heat pipes 2 are the same.

[0032] The phase change thermal storage material can be selected from stable materials such as paraffin, fatty acids, and alcohols, which do not exhibit supercooling. The working medium can be a fluid medium such as acetone or methanol, and the boiling point of the working medium must be lower than the melting point of the phase change thermal storage material.

[0033] Example 2

[0034] This embodiment provides an adjustable heat pipe phase change thermal storage device. The main difference from Embodiment 1 is that, in this embodiment, to increase the uniformity of heat exchange, several of the aforementioned pull-rod heat pipe assemblies are arranged in a ring along the outer wall of the main pipe 1, and the pull-rod heat pipe assemblies are arranged along the axial direction of the main pipe 1. To facilitate pulling the pull rods, one end of the pull rod 3 extends out of the main pipe.

[0035] Example 3

[0036] This embodiment provides an adjustable heat pipe phase change thermal storage device. The main difference from Embodiment 1 is that, in order to reduce heat loss, the outer shell 4 is wrapped with an insulation layer.

[0037] Example 4

[0038] This embodiment provides an adjustable heat pipe phase change thermal storage device. The main difference from Embodiment 1 is that, in this embodiment, for ease of installation and maintenance, several of the pull rod heat pipe assemblies have the same specifications.

[0039] Specifically, this utility model provides an adjustable heat pipe phase change thermal storage device, in which several heat pipes are centrally distributed about a main channel, comprising a total of 13 sets of tie-rod heat pipe assemblies. Each layer includes 8 heat pipes, the inclination angle of the heat pipes is 30° to 150°, and the distance between adjacent heat pipes is... The length of the heat pipe is Where L is the length of the housing, D is the outer diameter of the housing, d is the outer diameter of the main channel, and α is the tilt angle of the heat pipe.

[0040] Specifically, such as Figure 4 and Figure 5As shown, the specific working process of the adjustable heat pipe phase change thermal storage device provided by this utility model is as follows:

[0041] Thermal storage process:

[0042] like Figure 5 As shown, when there is sufficient sunlight, the collector 12 captures solar energy and heats the fluid inside the pipes. Part of the heated fluid flows through the heat exchanger 8 for use by the heat user 7, while the other part flows through the phase change heat storage unit, where it stores heat. During heat storage, the first valve 9 is opened, the second valve 10 is closed, and the third valve 11 is opened. By pulling the lever, several of the heat pipes are tilted upwards around the central axis of the main channel.

[0043] When the high-temperature fluid flows through the main channel of the phase change thermal storage unit, the working medium inside heat pipe 2 evaporates due to heat. The vapor flows towards the cold end of the heat pipe, i.e., the low-temperature region of the phase change material, due to buoyancy. The vapor condenses and releases heat, accelerating the melting process of the phase change material. The condensate, after passing through the wick 5 inside the heat pipe and under the influence of gravity, flows back to the hot end of the heat pipe to participate in the next working cycle, thus forming the heat charging process of the phase change material. The tie rod can effectively change the tilt angle of the heat pipe, allowing it to be adjusted promptly according to the external heat requirements.

[0044] Exothermic process:

[0045] like Figure 4 As shown, when there is insufficient sunlight, the heating effect of the collector on the fluid is reduced, and the phase change thermal storage unit will release heat at this time. During heat release, the first valve 9 is closed, the second valve 10 is opened, and the third valve 11 is closed. By pulling the lever, several of the heat pipes are tilted downwards around the central axis of the main channel.

[0046] When the low-temperature fluid flows through the main channel of the heat pipe phase change heat storage structure, the working medium inside the heat pipe is condensed into a liquid state. Under the influence of gravity, the condensate flows through the wick 5 to the hot end of the heat pipe, i.e., the high-temperature region of the phase change material. The heat released by the phase change material heats the heat exchange fluid and the condensate in the main channel. The condensate evaporates due to the heat, and the vapor flows to the cold end of the heat pipe due to buoyancy, participating in the next cycle. This process accelerates the solidification time of the phase change material, forming the exothermic process of the phase change material.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An adjustable heat pipe phase change thermal storage device, characterized in that: Includes the outer shell, main pipe, phase change thermal storage material, and several tie rod heat pipe assemblies; The main pipe is located at the axial center of the outer shell and is used to supply fluid flow to the solar collector; The phase change thermal storage material is filled in the space enclosed by the outer wall of the main pipe and the inner wall of the outer shell, and is used to absorb heat from the fluid for storage during heat storage, and to transfer heat to the fluid during heat release. Several of the aforementioned tie rod heat pipe assemblies are disposed within the phase change thermal storage material, and the tie rod heat pipe assemblies are used to transfer heat between the fluid and the phase change thermal storage material.

2. The adjustable heat pipe phase change thermal storage device according to claim 1, characterized in that: Each of the pull rod heat pipe assemblies includes a pair of pull rods and a plurality of heat pipes, the two ends of which are respectively hinged to the corresponding pull rods. The pull rods are used to change the tilt angle of the heat pipes within the phase change thermal storage material by synchronously pulling the plurality of heat pipes. Several of the heat pipes are filled with wicks, and the wicks are filled with a working medium.

3. An adjustable heat pipe phase change thermal storage device according to claim 1 or 2, characterized in that: Several of the aforementioned tie rod heat pipe assemblies are arranged in a ring along the outer side wall of the main pipe.

4. The adjustable heat pipe phase change thermal storage device according to claim 2, characterized in that: The pull rod heat pipe assembly is arranged along the axial direction of the main pipe.

5. An adjustable heat pipe phase change thermal storage device according to claim 2 or 4, characterized in that: One end of the pull rod extends out of the main pipe.

6. The adjustable heat pipe phase change thermal storage device according to claim 1, characterized in that: The outer shell is covered with an insulation layer.

7. An adjustable heat pipe phase change thermal storage device according to claim 1, 2, 4, or 6, characterized in that: Several of the aforementioned tie rod heat pipe assemblies have the same specifications.

8. An adjustable heat pipe phase change thermal storage device according to claim 2 or 4, characterized in that: In the heat storage state, the inclination angles of the heat pipes are the same; in the heat release state, the inclination angles of the heat pipes are the same.

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