Three-arc type heat storage unit

Abstract

The utility model provides a three-arc type heat storage unit which is of a shell-and-tube tank structure and comprises a tank body, a plurality of first arc surfaces, a plurality of second arc surfaces, a plurality of first arc surfaces and a plurality of second arc surfaces, wherein the circle center of the first cambered surface is the center of the tank body, the cambered surface of the first cambered surface is bent towards the center of the tank body, and the cambered surface of the second cambered surface is bent back to the center of the tank body; compared with a traditional circular heat storage unit, the special three-arc-shaped structure is adopted, the contact area is larger, turbulent flow is formed in a flow channel, the heat exchange efficiency is higher, and more space is saved.

Description

Technical Field

[0001] This utility model relates to the field of phase change heat storage heat exchanger technology, and in particular to a three-arc type heat storage unit. Background Technology

[0002] Phase change energy storage devices utilize the property of phase change materials (PCMs) to absorb or release large amounts of heat during phase change to store and release thermal energy, and have broad application prospects in energy storage and temperature control.

[0003] Chinese patent CN202210732368.1 discloses an irregular snowflake-shaped finned phase change heat storage device, including an HTF flow channel, an inner tube shell of the heat storage device, irregular snowflake-shaped fins, PCM heat storage material, and a heat storage device outer shell. The inner tube shell of the heat storage device is hollow to form an HTF flow channel, and irregular snowflake-shaped fins are connected to the outside. The outer shell of the heat storage device is sleeved on the outside of the irregular snowflake-shaped fins. The gap formed by the irregular snowflake-shaped fins and the outer shell of the heat storage device is filled with PCM heat storage material. The heat from the HTF is quickly transferred to the PCM heat storage material through the irregular snowflake-shaped fins, and the latent heat of phase change is used to store thermal energy. Then, the stored thermal energy is used for subsequent heat exchange.

[0004] However, existing shell-and-tube phase change accumulators typically employ a circular tube structure, placing the PCM (Polymerized Thermal Mass Module) in the space between the outer and inner tubes. The inner tube is filled with a heat transfer fluid (HTF). This type of accumulator has a small contact area between the PCM and the HTF, resulting in low heat exchange efficiency. Furthermore, it is difficult to adapt to harsh operating environments such as high temperatures or corrosive conditions. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a three-arc type heat storage unit. It adopts a special three-arc structure, which has a larger heat exchange contact area and higher heat exchange efficiency compared to traditional circular heat storage units. Furthermore, the use of graphite with a dense coating structure enables the heat storage unit to be applied in harsh environments, including the corrosiveness of PCM and HTF, as well as a higher heat storage temperature range.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A three-arc type heat storage unit is a shell-and-tube tank structure, comprising: a tank body, wherein the tank body is formed by a plurality of first arc surfaces and second arc surfaces arranged alternately along the circumference; wherein the center of the first arc surface is the center of the tank body, the arc surface of the first arc surface bends toward the center of the tank body, and the arc surface of the second arc surface bends away from the center of the tank body.

[0008] Preferably, the first arc surface and the second arc surface are each provided in three sets, and the arc angle of the first arc surface is 60°.

[0009] Preferably, the container also includes a sealing cap, which has the same cross-sectional shape as the container and is matched and sealed to the container.

[0010] Preferably, a stepped sealing structure is used between the sealing cap and the tank body.

[0011] Preferably, the sealing cap is sealed to the tank body by applying a ceramic coating.

[0012] Preferably, the system further includes a main rib disposed within the tank body, wherein each of the first arc surfaces is connected to the center of the tank body by one of the main ribs.

[0013] Preferably, the main rib is connected to the midpoint of the arc of the first arc surface.

[0014] Preferably, the tank body also includes secondary ribs, wherein each main rib is connected to two second arc surfaces on both sides by a secondary rib, and each main rib and secondary rib divides the tank body into nine regions.

[0015] Preferably, the secondary reinforcement connection is located between the midpoint of the main reinforcement and the one-third dividing point of the second arc surface.

[0016] Preferably, the heat storage unit uses graphite material and is coated with a ceramic coating on its inner and outer surfaces.

[0017] Preferably, the height of the tank is 100~500mm, the wall thickness is 2~15mm, the diameter of the first arc surface is 20~200mm, the arc angle of the second arc surface is 50~150°, the thickness of the sealing cap is 10~50mm, and the thickness of the ceramic coating is 10~100μm.

[0018] The beneficial effects of this utility model are as follows:

[0019] (1) This utility model adopts a special three-arc structure, which has a larger contact area and forms turbulence in the flow channel compared with the traditional circular heat storage unit, resulting in higher heat exchange efficiency and more space saving;

[0020] (2) The present invention is combined with the distribution of primary and secondary ribs in the tank body to further improve the heat exchange efficiency by increasing the heat exchange area and adjusting the uniformity of the heat transfer path.

[0021] (3) In terms of material selection, this utility model adopts graphite with a dense coating, so that the heat storage unit can be used in harsh environments, including the corrosiveness of PCM, the corrosiveness of HTF and a higher heat storage temperature range. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the three-arc heat storage unit in this utility model;

[0023] Figure 2 for Figure 1 Top view;

[0024] Figure 3 This is a schematic diagram of the tank structure in this utility model;

[0025] Figure 4 for Figure 3 Top view;

[0026] Figure 5 This is a schematic diagram of the sealing cap structure in this utility model;

[0027] Figure 6 This is a schematic diagram showing the splicing and use of the three-arc heat storage unit in this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Example 1

[0031] like Figure 1 As shown, a three-arc type heat storage unit is a shell-and-tube tank structure, comprising: a tank body 1, wherein the tank body 1 is formed by a plurality of first arc surfaces 11 and second arc surfaces 12 arranged alternately along the circumference; wherein the center of the first arc surface 11 is the center of the tank body 1, the arc surface of the first arc surface 11 bends toward the center of the tank body 1, and the arc surface of the second arc surface 12 bends away from the center of the tank body 1.

[0032] Regarding the shape of the tank 1, as a supplementary explanation, the shape of the tank 1 is the cross-sectional shape obtained after the three equal arcs (i.e., the second arc surface 12) intersect and are cut off from the circular base. The remaining arc after the circular base is cut off is the first arc surface 11.

[0033] Preferably, the container also includes a sealing cap 2, which has the same cross-sectional shape as the container body 1 and is matched and sealed to the container body 1.

[0034] Preferably, the sealing cap 2 and the tank body 1 adopt a stepped sealing structure.

[0035] In this embodiment, as a preferred implementation, such as Figure 5 As shown, the bottom surface of the sealing cap 2 has a boss 21. The outer diameter of the boss 21 is adapted to the inner diameter of the tank body 1. The tank body 1 is provided with a groove that is adapted to the shape and size of the boss 21. So when the sealing cap 2 is placed on the tank body 1, the boss 21 extends into the tank body 1 and cooperates with the groove, thereby achieving a stepped multi-stage seal between the two.

[0036] Preferably, the sealing cap 2 and the tank body 1 are sealed by applying a ceramic coating.

[0037] It should be noted that the coating process involves spraying a pre-mixed ceramic coating and then sintering it. During the sintering process, the coating evaporates at the seal between the sealing cap 2 and the tank body 1, then adheres to the surface of the heat storage unit body, forming a dense ceramic coating that connects with the upper and lower parts. This can be understood as the ceramic coating at the gaps connecting with the ceramic coatings of the sealing cap 2 and the tank body 1, forming a single, dense ceramic coating that encapsulates the gaps, thus achieving a seal.

[0038] Preferably, the heat storage unit uses graphite material and is coated with a ceramic coating on its inner and outer surfaces.

[0039] In this embodiment, the heat storage unit uses graphite material and is coated with ceramic coating on its inner and outer surfaces. This allows the heat storage unit to be used in harsh environments, including the corrosiveness of PCM and HTF, as well as a higher heat storage temperature range. It is resistant to high temperatures and corrosion and is impermeable. Its applicable temperature range is -100~1500℃.

[0040] As a preferred embodiment, the ceramic coating specifically employs a silicon carbide coating.

[0041] Preferably, the height of the tank body 1 is 100~500mm and the wall thickness is 2~15mm, the diameter of the first arc surface 11 is 20~200mm, the arc angle of the second arc surface 12 is 50~150°, the thickness of the sealing cap 2 is 10~50mm, and the thickness of the ceramic coating is 10~100μm.

[0042] Example 2

[0043] The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that:

[0044] Preferably, the first arc surface 11 and the second arc surface 12 are each provided in three sets, and the arc angle of the first arc surface 11 is 60°.

[0045] In this embodiment, a special three-arc structure is formed by three first arc surfaces 11 and three second arc surfaces 12 arranged in an alternating array along the circumference. Compared with the traditional circular heat storage unit, the contact area is larger, and turbulence is formed in the flow channel, resulting in higher heat exchange efficiency and more space saving.

[0046] It should be further explained that, in practical applications, multiple heat storage units in this embodiment are connected together. Specifically, the connection method between two adjacent heat storage units is that the first arc surface 11 of one heat storage unit and the second arc surface 12 of another heat storage unit are connected at the apex of the arc, thereby forming a crescent-shaped gap between the two adjacent heat storage units. This gap serves as the HTF flow channel 5. Figure 6 As shown.

[0047] This heat storage unit splicing structure can create turbulence within the flow channel during use. Specifically, the gaps between each heat exchange unit are small, the flow velocity is high, and the crescent-shaped HTF flow channel 5 has a relatively irregular cross-section. When the fluid passes through, due to the flow velocity and cross-sectional irregularity, a turbulent state is formed. While increasing the flow resistance, it also increases the heat exchange efficiency. It can effectively reduce the short-flow escape phenomenon of HTF, uniformly control the flow velocity and direction of HTF fluid, thereby adjusting the flow field of HTF and increasing the heat exchange area, thus improving the heat exchange efficiency; it also avoids the situation of PCM expanding and overflowing after being heated, and reduces the direct contact between PCM and HTF.

[0048] As a supplementary explanation, compared to the gap formed by the four tangent circular heat storage units, the crescent-shaped HTF channel 5 in this embodiment is more elongated and has a smaller area. The elongation makes the effective heat exchange area of ​​HTF contacting the heat storage unit larger, and the smaller area reduces the proportion of HTF escaping without heat exchange. The situation where PCM overflows due to thermal expansion and comes into contact with HTF is avoided by sealing the heat storage unit with a cover.

[0049] Example 3

[0050] The components in this embodiment that are the same as or corresponding to those in the above embodiments are referred to by the same reference numerals as those in the above embodiments. For the sake of simplicity, only the differences between this embodiment and the above embodiments are described below. The difference between this embodiment and the above embodiments is that:

[0051] Preferably, it also includes: a main rib 3 disposed inside the tank body 1, wherein each of the first arc surfaces 11 is connected to the center of the tank body 1 by a main rib 3.

[0052] Preferably, the main rib 3 is connected to the midpoint of the arc of the first arc surface 11.

[0053] Preferably, the tank body 1 is further provided with secondary ribs 4, and each main rib 3 is connected to the two second arc surfaces 12 on both sides by a secondary rib 4, and each main rib 3 and secondary rib 4 divides the tank body 1 into nine regions.

[0054] Preferably, the secondary rib 4 is connected between the midpoint of the main rib 3 and the one-third dividing point of the second arc surface 12.

[0055] It should be noted that the nine areas divided by the main reinforcement 3 and the secondary reinforcement 4 are used to place the PCM.

[0056] In this embodiment, main ribs 3 and secondary ribs 4 are further distributed within the three-arc-shaped tank 1 to further improve heat exchange efficiency by increasing the heat exchange area and adjusting the uniformity of the heat transfer path. Specifically:

[0057] Specifically, the phase change thermal storage material has a low thermal conductivity, while the thermal storage unit uses modified graphite material with a relatively high thermal conductivity. Through the arrangement of primary and secondary ribs, the heat on the outer surface of the thermal storage unit can be quickly transferred to the center of the phase change thermal storage material along the path of the primary and secondary ribs, instead of relying entirely on the phase change thermal storage material itself to transfer heat to the center. The primary and secondary ribs are equivalent to increasing the heat exchange area between the thermal storage unit and the phase change thermal storage material.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A three-arc type heat storage unit, characterized in that, The thermal storage unit is a shell-and-tube tank structure, which includes: The tank (1) is formed by a plurality of first arc surfaces (11) and second arc surfaces (12) arranged in an alternating array along the circumference; wherein the center of the first arc surface (11) is the center of the tank (1), the arc surface of the first arc surface (11) bends toward the center of the tank (1), and the arc surface of the second arc surface (12) bends away from the center of the tank (1).

2. The three-arc type heat storage unit according to claim 1, characterized in that, The first arc surface (11) and the second arc surface (12) are each provided in three sets, and the arc angle of the first arc surface (11) is 60°.

3. The three-arc type heat storage unit according to claim 1, characterized in that, Also includes: A sealing cap (2) has the same cross-sectional shape as the tank body (1) and is matched and sealed to the tank body (1).

4. A three-arc type heat storage unit according to claim 3, characterized in that, The sealing cap (2) and the tank body (1) adopt a stepped sealing structure.

5. A three-arc type heat storage unit according to claim 3, characterized in that, The sealing cap (2) and the tank body (1) are sealed by applying a ceramic coating.

6. A three-arc type heat storage unit according to claim 1, characterized in that, Also includes: The main ribs (3) are provided inside the tank body (1), and each of the first arc surfaces (11) is connected to the center of the tank body (1).

7. A three-arc type heat storage unit according to claim 6, characterized in that, Also includes: The secondary ribs (4) are provided in the tank body (1). Each main rib (3) is connected to the two second arc surfaces (12) on both sides by a secondary rib (4). Each main rib (3) and secondary rib (4) divides the tank body (1) into nine regions.

8. A three-arc type heat storage unit according to claim 7, characterized in that, The main reinforcement (3) is connected to the midpoint of the arc of the first arc surface (11); the secondary reinforcement (4) is connected between the midpoint of the main reinforcement (3) and the one-third dividing point of the second arc surface (12).

9. A three-arc type heat storage unit according to any one of claims 1-8, characterized in that, The heat storage unit uses graphite material and is coated with ceramic coating on its inner and outer surfaces.

10. A three-arc type heat storage unit according to any one of claims 1-8, characterized in that, The height of the tank (1) is 100~500mm and the wall thickness is 2~15mm. The diameter of the first arc surface (11) is 20~200mm. The arc angle of the second arc surface (12) is 50~150°. The thickness of the sealing cap (2) is 10~50mm and the thickness of the ceramic coating is 10~100μm.

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