Phase change material packaging capsule with high heat exchange performance
By designing a capsule shell with grooves and an encapsulated capsule with a cavity structure, the heat exchange capacity and deformation problems of the encapsulated capsule are solved, efficient phase change material energy storage and heat exchange are achieved, and the stacking process is simplified.
Patent Information
- Application Number
- CN202421833947.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing encapsulated capsules have poor surface heat exchange capacity, uneven distribution of phase change materials, insufficient deformation resistance of the shell, and complex stacking methods, resulting in low efficiency of phase change energy storage devices.
The capsule shell is designed with grooves, a cavity structure inside, and a thin plate, olive-shaped, or flying saucer-shaped appearance, allowing the phase change material to fully participate in the phase change, and increasing the surface area and fluid channels through the grooves, reducing deformation, and achieving efficient stacking.
It improves the heat transfer performance of phase change materials and the efficiency of energy storage equipment, simplifies the stacking process, and extends the service life of the equipment.
Smart Images
Figure CN223304382U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of packaging capsules, in particular to a high heat exchange performance phase change material packaging capsule. Background Art
[0002] Phase change materials (PCMs) are substances that undergo a physical change at specific temperatures, simultaneously absorbing or releasing large amounts of latent heat. This property makes PCMs energy-efficient and environmentally friendly, particularly for temperature control applications. PCMs primarily fall into two categories: organic and inorganic. Water is the most common phase change material, and its solid-liquid transition at 0°C is accompanied by the absorption and release of significant amounts of heat.
[0003] Encapsulation technology was developed to address issues such as leakage and phase separation that may arise in the practical application of phase change materials. By encapsulating the phase change material in a capsule, its specific surface area can be increased, its thermal conductivity can be improved, and phase separation and supercooling can be eliminated, thereby improving the stability and service life of the phase change material. Especially for inorganic phase change materials, encapsulation can prevent direct contact between the phase change material and other materials, thereby preventing corrosion of the inorganic material on other materials. Encapsulation technology can be categorized into conventional sizes (over 10 mm in all directions) and microscopic sizes (micrometer-level in all directions).
[0004] Phase change material encapsulated capsules with high heat transfer performance have broad application prospects in energy-saving buildings, solar energy utilization, and industrial waste heat recovery. They can be used in both air and water heat exchange modes, both of which require phase change materials. The advantages of encapsulated capsules are mainly reflected in the following aspects: no leakage, high heat storage, good thermal stability, large heat transfer area, and environmental protection. Phase change microcapsules solve the problems of traditional PCMs such as low thermal conductivity, leakage erosion, and short service life, giving them broad development prospects in thermal energy storage and thermal management.
[0005] Most existing encapsulation capsules adopt relatively simple and standardized appearance designs, such as flat, rod, and spherical. The characteristics of this design are simple design and manufacturing process and easy use; however, the disadvantages are as follows:
[0006] 1. Poor surface heat transfer capacity: Most capsules of conventional sizes have relatively smooth outer surfaces, which are not suitable for forming an ideal convection heat transfer mechanism.
[0007] 2. Unsatisfactory distribution of some phase change materials: Since conventional-sized capsules mostly adopt large geometric shapes, such as flat boxes and spheres, the thickness of their phase change materials is often too thick. However, the heat transfer ability of the phase change materials themselves is poor. Therefore, the phase change materials located deep inside the capsule cannot fully participate in the phase change within a limited time.
[0008] 3. The shell has poor ability to withstand deformation: Since the volume of the phase change material will expand in different directions to varying degrees when the solid-liquid phase change occurs, the capsule needs to have a certain ability to absorb deformation, otherwise the capsule will be damaged after multiple phase changes.
[0009] 4. Complex stacking method: The main method of setting up phase change energy storage equipment in the water system is to place phase change energy storage materials in the energy storage tank, among which inorganic phase change materials are mainly encapsulated in built-in capsules, while organic phase change materials are mainly filled. When using the built-in capsule method, it is necessary to fully consider the stacking method of the capsules. Under a reasonable stacking method, in addition to all capsules being able to fully participate in heat exchange through the surrounding water flow, it is also necessary to consider the overall flow resistance formed by the stacking of capsules on the water side inside the energy storage tank, and the pressure on the bottom capsules formed by the taller water tank after the capsules are stacked. The most important thing is to increase the filling ratio of the phase change material as much as possible, while maximizing the ability of the phase change material to participate in heat exchange. Currently, common capsules, except for spherical capsules, do not fully consider the above requirements, so some of the above requirements may not be met during stacking.
[0010] Therefore, there is an urgent need for a phase change material encapsulation capsule with high heat transfer performance to solve the above problems. Utility Model Content
[0011] The purpose of the embodiments of the present invention is to provide a phase change material encapsulated capsule with high heat exchange performance to solve the problems raised in the above background technology.
[0012] To achieve the above objectives, the present invention provides the following technical solutions:
[0013] A high heat exchange performance phase change material encapsulated capsule comprises: a capsule shell, a cavity is provided inside the capsule shell, the phase change material fills the capsule shell cavity, a plurality of groups of grooves are provided on the surface of the capsule shell for accommodating the volume change caused by the solid-liquid phase change of the phase change material, a filling port is provided on the capsule shell and is connected to the internal cavity thereof, and a sealing cover is detachably provided on the filling port for sealing the filling port.
[0014] As a further solution of the present invention: the phase change material is gas.
[0015] As a further solution of the present invention: the capsule shell is in the shape of a thin plate, and the internal cavity of the capsule shell is composed of a plurality of groups of small units interconnected with each other.
[0016] As a further solution of the present invention: the phase change material is liquid.
[0017] As a further solution of the present invention: the capsule shell is olive-shaped or flying saucer-shaped.
[0018] Compared with the prior art, the beneficial effects of the present invention are:
[0019] 1. The encapsulated material in the present invention can fully participate in the phase change within a limited time, thereby significantly increasing the total amount of energy stored and released by the phase change energy storage device (storage tank) within the same period of time, greatly improving the phase change storage and release capacity and rate;
[0020] 2. The special shape design of this utility model greatly enhances the heat exchange capacity between the ambient medium (air, water) and the capsule, thereby greatly improving the heat exchange efficiency of the energy storage equipment (storage tank);
[0021] 3. The random stacking effect of the present invention greatly simplifies the engineering work of transforming various existing storage tanks into phase change energy storage devices. It is no longer necessary to completely replace the existing energy storage equipment or to carry out large-scale transformation of the energy storage equipment. It is only necessary to find or set a suitable filling inlet on the existing storage tank and form an ideal stacking state by randomly placing capsules. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the capsule shell in the embodiment of the present invention when it is in the shape of a thin plate.
[0023] Figure 2 for Figure 1 Three views of .
[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the capsule shell in the embodiment of the present invention when it is olive-shaped.
[0025] Figure 4 for Figure 3 Three views of .
[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the capsule shell in the embodiment of the utility model when it is in the shape of a flying saucer
[0027] Figure 6 for Figure 5 Three views of .
[0028] In the figure: 1. Capsule shell; 2. Groove; 3. Filling port; 4. Sealing cover. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0030] In this utility model embodiment, please refer to Figures 1 to 6 A phase change material encapsulated capsule with high heat exchange performance, a capsule shell 1, a cavity is provided inside the capsule shell 1, the phase change material fills the internal cavity of the capsule shell 1, a plurality of groups of grooves 2 are provided on the surface of the capsule shell 1, which are used to accommodate the volume change caused by the solid-liquid phase change of the phase change material, and a filling port 3 connected to its internal cavity is opened on the capsule shell 1, and a sealing cover 4 for sealing it is detachable on the filling port 3.
[0031] The phase change material is filled into the capsule shell 1 from the filling port 3 so that the phase change material fills the interior of the capsule shell 1. The filling port 3 is sealed with a sealing cover 4. The provision of the groove 2 increases the surface area of the capsule shell 1 and improves the heat exchange effect. At the same time, when the volume of the phase change material changes due to the solid-liquid phase change, the deformation of the overall shape of the capsule shell 1 is reduced by changing the shape of the groove 2.
[0032] As an embodiment of the present invention, please refer to Figure 1 and Figure 2 When the phase change material is a gas, the capsule shell 1 is in the shape of a thin plate, and the internal cavity of the capsule shell 1 is composed of a number of small units interconnected with each other.
[0033] In this embodiment, the internal cavity of the thin plate is designed to be small units interconnected by maze-like channels, so that all units can be filled when the phase change material is filled; the specification design principle of the unit itself is to allow the filled phase change material to be confined to the unit during the solid-liquid phase change, and not to flow between units; the cavity inside the unit ensures that the total thickness of the phase change material in all directions after filling is the deepest phase change material, so that the phase change material can fully participate in the phase change within the appropriate charging and discharging time without requiring too long storage time; the grooves 2 provided on the surface of the capsule shell 1 can cause turbulence in the surrounding airflow, thereby increasing the comprehensive heat exchange capacity between the phase change material inside the capsule shell 1 and the external air.
[0034] In this embodiment, when several groups of the capsule shells 1 are spread out, an overlapping structure that seamlessly extends in length and width along the same plane is designed between the capsule shells 1 to ensure a tight connection when spread out; when several groups of the capsule shells 1 are laid and stacked, after multiple thin plate-shaped capsule shells 1 are stacked in parallel, a cavity is left between the capsule shells 1 to maintain sufficient air passage.
[0035] In this embodiment, corresponding fixing or interconnecting positions need to be provided on the thin plate-shaped capsule shell 1 to form an integral heat exchange unit by embedding or connecting in series.
[0036] As an embodiment of the present invention, please refer to Figures 3 to 4. Figure 6 When the phase change material is liquid, the capsule shell 1 is olive-shaped or saucer-shaped.
[0037] In this embodiment, the internal cavity of the capsule shell 1 may be through-type, but the overall shape is olive-shaped with a maximum diameter not exceeding 40 mm, or flying saucer-shaped with a maximum thickness not exceeding 40 mm.
[0038] In this embodiment, the grooves 2 on the capsule shells 1 will form gaps when they are stacked. Several groups of capsule shells 1 are randomly stacked into a relatively uniform distribution, and sufficient water flow channels are formed between the several groups of capsule shells 1, without being tightly fitted or embedded with each other to form closed water flow channels, thereby affecting the "insulating clumps" or "thermal response islands" of heat exchange.
[0039] In this embodiment, the groove 2 is of irregular shape.
[0040] As an embodiment of the present invention, the capsule shell 1 is made of a flexible non-metallic material, which can absorb the volume change of the phase change material during the solid-liquid change.
[0041] The working principle of the present invention is as follows: the phase change material is filled into the interior of the capsule shell 1 from the filling port 3 so that the phase change material fills the interior of the capsule shell 1, and the filling port 3 is sealed by the sealing cover 4. The provision of the groove 2 increases the surface area of the capsule shell 1 and improves the heat exchange effect. At the same time, when the volume of the phase change material changes during the solid-liquid phase change, the deformation of the overall shape of the capsule shell 1 is reduced by changing the shape of the groove 2. When several groups of capsule shells 1 are stacked, an air flow or water flow channel is formed in the middle.
[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A high heat transfer performance phase change material encapsulated capsule, characterized in that: include: A capsule shell is provided with a cavity inside the capsule shell, the phase change material fills the internal cavity of the capsule shell, and a plurality of grooves are provided on the surface of the capsule shell for accommodating the volume change caused by the solid-liquid phase change of the phase change material. A filling port connected to the internal cavity is provided on the capsule shell, and a sealing cover for sealing the filling port is detachably provided on the filling port.
2. The high heat exchange performance phase change material encapsulated capsule according to claim 1, characterized in that: The phase change material is gas.
3. The high heat exchange performance phase change material encapsulated capsule according to claim 2, characterized in that: The capsule shell is in the shape of a thin plate, and the internal cavity of the capsule shell is composed of a plurality of groups of small units interconnected.
4. The high heat exchange performance phase change material encapsulated capsule according to claim 1, characterized in that: The phase change material is liquid.
5. The high heat exchange performance phase change material encapsulated capsule according to claim 4, characterized in that: The capsule shell is olive-shaped or saucer-shaped.
6. The high heat exchange performance phase change material encapsulated capsule according to claim 1, characterized in that: The capsule shell is made of flexible non-metallic material.