An electric heating device for air conditioning and a computer room air conditioner

Abstract

This utility model discloses an electric heating device for air conditioning and a computer room air conditioner. The electric heating device includes a folding mounting frame, which has at least two states: unfolded and retracted; a driving component, capable of driving the folding mounting frame to switch between the two states; and an electric heater disposed on the folding mounting frame. When the folding mounting frame is switched to different states (unfolded or retracted), the heat dissipation area of ​​the electric heater changes accordingly. This utility model achieves the unfolding and retracting movement of the electric heater inside the evaporator through the cooperation of the folding mounting frame and the driving component, thereby controlling the area of ​​the electric heater's sheet metal exposed to the air, reducing condensation formation, and improving the stability and cooling effect of the computer room air conditioner.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an electric heating device for air conditioning and a computer room air conditioner. Background Technology

[0002] With rapid economic development, the communications, mobile internet, and big data industries are also growing rapidly, leading to increasingly stringent requirements for data center air conditioning. Air-cooled data center air conditioners, as a type of data center air conditioning, are mainly used in computer rooms, data centers, and electronic equipment rooms to provide cooling, heating, air circulation, and humidity control, ensuring that the environment meets the normal operating requirements of the equipment.

[0003] To maintain a stable ambient temperature, computer room air conditioners not only have cooling but also heating functions. However, the electric heaters used in the heating function of air-cooled downdraft computer room air conditioners are generally installed inside the evaporator. Moreover, to improve heating efficiency, the electric heaters are usually distributed in a U-shape inside the evaporator. This distribution maximizes the space utilization of the electric heaters, ensures uniform heat distribution, avoids local overheating or uneven heating, and allows heat to be transferred to the air more effectively, thus improving heating efficiency.

[0004] However, when the computer room air conditioner is turned on in cooling mode, the humid air has a higher specific heat capacity in a cold environment, resulting in a slower overall temperature change. Meanwhile, the fixed sheet metal at the electric heater has good thermal conductivity and can quickly reach thermal equilibrium with the surrounding environment, with its temperature usually close to the ambient temperature. The larger the contact area between the sheet metal and the air, the higher the heat exchange efficiency. A large sheet metal area absorbs heat from the air more easily, leading to a lower surface temperature. Therefore, the temperature of the humid air can sometimes differ significantly from the temperature of the sheet metal at the electric heater, causing condensation to form on the sheet metal. The larger the area, the more pronounced the cooling effect and the faster the condensation forms. The formation of condensation poses certain safety hazards, potentially damaging equipment, affecting the normal operation of the air conditioner, and reducing cooling efficiency. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an electric heating device for air conditioning and a computer room air conditioner, which aims to solve the problem that when the cooling temperature of the computer room air conditioner is low, condensate will be released from the sheet metal of the electric heater fixed inside the evaporator, affecting the normal operation of the unit.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] On the one hand, this utility model provides an electric heating device for air conditioning, comprising:

[0008] The folding mounting bracket has at least two states: unfolded and folded.

[0009] The drive component is capable of driving the folding mounting bracket to switch between two states: unfolded and retracted.

[0010] An electric heater is provided on the folding mounting frame;

[0011] When the folding mounting bracket is switched to different states of unfolding or folding, the heat dissipation area of ​​the electric heater changes accordingly.

[0012] Furthermore, the folding mounting bracket includes a linkage assembly, a fixed bracket, and a movable bracket. The linkage assembly is movably connected to the fixed bracket and the movable bracket. Under the action of the linkage assembly, the movable bracket moves away from or closer to the fixed bracket.

[0013] Furthermore, the linkage assembly includes a first linkage, a second linkage, a third linkage, and a fourth linkage. The two ends of the first linkage are rotatably connected to the fixed bracket and the movable bracket, respectively. One end of the second linkage is rotatably connected to the fixed bracket. One end of the third linkage and one end of the fourth linkage are rotatably connected to the movable bracket. The other ends of the second linkage, the third linkage, and the fourth linkage are hinged.

[0014] Furthermore, one end of the first connecting rod is rotatably connected to the fixed bracket via a first rotating shaft, and one end of the second connecting rod is rotatably connected to the fixed bracket via a second rotating shaft.

[0015] Furthermore, the drive assembly includes a first motor and a second motor, the first motor being connected to the first rotating shaft via a transmission, and the second motor being connected to the second rotational transmission.

[0016] Furthermore, both the fixed bracket and the movable bracket are equipped with the electric heater.

[0017] Furthermore, the folding mounting bracket also includes a main support, and the fixed support is fixedly connected to the main support.

[0018] Furthermore, it also includes a temperature sensor for detecting the air temperature inside the evaporator.

[0019] Furthermore, it also includes a distance sensor for detecting the distance between the fixed bracket and the movable bracket.

[0020] On the other hand, this utility model also provides a computer room air conditioner, including an evaporator, a fan, and the aforementioned air conditioning electric heating device. The fan is located at the bottom of the evaporator, and the air conditioning electric heating device is located inside the evaporator. When the folding mounting bracket is in the unfolded state, the sheet metal area of ​​the electric heater exposed to the air is maximized, so as to maximize the heat dissipation area of ​​the electric heater. When the folding mounting bracket is in the retracted state, the sheet metal area of ​​the electric heater exposed to the air is minimized, so as to minimize the heat dissipation area of ​​the electric heater.

[0021] The beneficial effects of this utility model compared with the prior art are as follows: An electric heating device for air conditioning includes a folding mounting frame, which has at least two states: unfolded and retracted; a driving component capable of driving the folding mounting frame to switch between the two states; and an electric heater disposed on the folding mounting frame. When the folding mounting frame is switched to different states (unfolded or retracted), the heat dissipation area of ​​the electric heater changes accordingly. This utility model achieves the unfolding and retracting movement of the electric heater inside the evaporator through the cooperation of the folding mounting frame and the driving component, thereby controlling the area of ​​the electric heater's sheet metal exposed to the air, thus reducing condensation formation and improving the stability and cooling effect of the computer room air conditioning operation.

[0022] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of a computer room air conditioner provided for a specific embodiment of this utility model;

[0025] Figure 2 A schematic diagram of the internal structure of a computer room air conditioner is provided for a specific embodiment of this utility model;

[0026] Figure 3 A schematic diagram of the structure of a folding mounting bracket in an electric heating device for air conditioning, provided for a specific embodiment of this utility model;

[0027] Figure 4A schematic diagram of the structure of an electric heating device for air conditioning provided in a specific embodiment of this utility model. Figure 1 ;

[0028] Figure 5 A schematic diagram of the structure of an electric heating device for air conditioning provided in a specific embodiment of this utility model. Figure 2 ;

[0029] Figure 6 A schematic diagram of the structure of an electric heating device for air conditioning provided in a specific embodiment of this utility model. Figure 3 ;

[0030] Figure 7 A schematic diagram of the unfolded state of an electric heating device for air conditioning provided for a specific embodiment of this utility model;

[0031] Figure 8 This is a schematic diagram of the retracted state of an electric heating device for air conditioning, provided as a specific embodiment of the present utility model.

[0032] Figure Labels

[0033] 1. Electric heating device for air conditioning; 11. Folding mounting bracket; 111. Fixed bracket; 112. Movable bracket; 113. First connecting rod; 114. Second connecting rod; 115. Third connecting rod; 116. Fourth connecting rod; 117. First rotating shaft; 118. Second rotating shaft; 119. Main bracket; 12. Electric heater; 13. First motor; 14. Second motor; 15. Temperature sensor; 16. Distance sensor; 100. Computer room air conditioner; 200. Evaporator; 300. Fan. Detailed Implementation

[0034] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 are not intended to indicate or imply that the device or element 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.

[0036] 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0040] like Figures 1 to 8 As shown, this embodiment of the utility model provides a computer room air conditioner 100, including an evaporator 200, a fan 300, and an air conditioning electric heating device 1. The evaporator 200 is used to cool the computer room air conditioner 100, the fan 300 is located at the bottom of the evaporator 200, and the air conditioning electric heating device 1 is located inside the evaporator 200. When the computer room air conditioner 100 turns on its cooling function, the fan 300 starts. At this time, the refrigerant flows in the evaporator 200. When ambient air passes through the evaporator 200, due to heat transfer, the cold refrigerant carries away the heat from the air, lowering the air temperature. Then, the fan 300 discharges the cold air.

[0041] like Figures 3 to 8 As shown, the air conditioning electric heating device 1 includes a folding mounting bracket 11, a drive assembly, and an electric heater 12. The folding mounting bracket 11 has at least two states: unfolded and retracted. The drive assembly can drive the folding mounting bracket 11 to switch between the two states. The electric heater 12 is disposed on the folding mounting bracket 11. When the folding mounting bracket 11 is switched to different states of unfolding or retracting, the heat dissipation area of ​​the electric heater 12 changes accordingly.

[0042] In some embodiments, when the folding mounting bracket 11 is in the unfolded state (i.e.) Figure 7 (As shown in the diagram), the sheet metal area of ​​the electric heater 12 exposed to the air is maximized, thus maximizing the heat dissipation area of ​​the electric heater 12. When the folding mounting bracket 11 is in the retracted state (i.e., Figure 8 (As shown in the diagram), the sheet metal area of ​​the electric heater 12 exposed to the air is minimized, so as to minimize the heat dissipation area of ​​the electric heater 12.

[0043] The electric heater 12 expands and contracts inside the evaporator 200 by cooperating with the folding mounting bracket 11 and the drive assembly, thereby controlling the area of ​​the sheet metal of the electric heater 12 exposed to the air, reducing the formation of condensate, and improving the stability and cooling effect of the computer room air conditioner 100.

[0044] like Figure 3As shown, the folding mounting bracket 11 includes a linkage assembly, a fixed bracket 111, and a movable bracket 112. The linkage assembly is movably connected to the fixed bracket 111 and the movable bracket 112. Under the action of the linkage assembly, the movable bracket 112 moves away from or closer to the fixed bracket 111. Both the fixed bracket 111 and the movable bracket 112 are equipped with electric heaters 12.

[0045] In one embodiment, the fixed bracket 111 and the movable bracket 112 may adopt a metal frame structure, and the linkage assembly may be a multi-link mechanism, such as a three-link mechanism, a four-link mechanism, or a five-link mechanism.

[0046] like Figure 3 and Figure 4 As shown, the linkage assembly includes a first link 113, a second link 114, a third link 115, and a fourth link 116. The four links can be made of rigid or flexible materials (such as high-strength spring steel sheets or carbon fiber composite materials). The two ends of the first link 113 are rotatably connected to the fixed bracket 111 and the movable bracket 112, respectively. One end of the second link 114 is rotatably connected to the fixed bracket 111. One end of the third link 115 and one end of the fourth link 116 are rotatably connected to the movable bracket 112. The other ends of the second link 114, the third link 115, and the fourth link 116 are hinged.

[0047] In one embodiment, both the fixed bracket 111 and the movable bracket 112 include two parallel and oppositely arranged fixed plates. The electric heaters 12 on the fixed bracket 111 and the movable bracket 112 are respectively fixed to one of the fixed plates of the fixed bracket 111 and the movable bracket 112, and are located on the same side. The fixing method can be welding or bolt connection. Bearing seats are installed near the upper and lower ends of the two fixed plates of the fixed bracket 111. A first rotating shaft 117 and a second rotating shaft 118 are provided on the bearing seats of the two fixed plates. One end of the first connecting rod 113 is sleeved on the first rotating shaft 117, thus forming a rotatable connection with the fixed bracket 111. The other end is connected to the movable bracket 112 through a similar rotating shaft and bearing structure. One end of the second connecting rod 114 is sleeved on the second rotating shaft 118, thus forming a rotatable connection with the fixed bracket 111. One end of the third connecting rod 115 and one end of the fourth connecting rod 116 are respectively rotatably connected to the movable bracket 112, and their connection method is similar to the connection between the first connecting rod 113 and the movable bracket 112. The other ends of the second link 114, the third link 115 and the fourth link 116 are hinged through a common hinge point. This hinge point can be achieved by a pin that runs through the three links. The two ends of the pin are fixed by nuts or snap rings to ensure that the three links can rotate flexibly at the hinge point and will not fall off.

[0048] Through the design of the four-bar linkage described above, the reciprocating motion of the movable support 112 can be achieved through a simple and stable mechanical transmission method, thereby precisely controlling the heat dissipation area of ​​the electric heater 12. The four-bar linkage has the characteristics of compact structure, smooth movement, and good force transmission performance. Compared with complex transmission structures, it has higher reliability and lower manufacturing cost.

[0049] like Figure 4 As shown, the drive assembly includes a first motor 13 and a second motor 14. The first motor 13 is connected to the first rotating shaft 117 for transmission, and the second motor 14 is connected to the second rotational transmission.

[0050] The drive assembly serves as the core power unit controlling the unfolding and folding of the folding mounting bracket 11. Both the first motor 13 and the second motor 14 can be stepper motors or servo motors. The first motor 13 is driven by the first rotating shaft 117, driving the first rotating shaft 117 to rotate, which in turn drives the first connecting rod 113 to rotate. Similarly, the second motor 14 is driven by the second rotating shaft 118, driving the second rotating shaft 118 to rotate, which in turn drives the second connecting rod 114 to rotate.

[0051] By employing a first motor 13 and a second motor 14, the rotation of the first link 113 and the second link 114 can be controlled independently, which can achieve more flexible and precise motion control compared to single motor drive.

[0052] like Figure 4 As shown, the folding mounting frame 11 also includes a main support 119, with a fixed support 111 fixedly connected to the main support 119. The main support 119 serves as a fixed foundation, bearing the weight of the fixed support 111, the movable support 112, the electric heater 12, and the linkage assembly, as well as the forces generated during movement. The main support 119 can be made of high-strength metal, such as aluminum alloy or stainless steel, and processed into a frame or plate structure. A rigid connection is used between the fixed support 111 and the main support 119 to ensure stability during the movement of the folding mounting frame 11. Specific connection methods may include welding, bolting, or riveting.

[0053] During installation, after the movable bracket 112 and the connecting rod assembly are installed on the fixed bracket 111, the entire folding mounting bracket 11 is fixed to the inner wall of the evaporator 200 of the computer room air conditioner 100 by the main bracket 119.

[0054] The main support 119 is set up and the fixed support 111 is fixedly connected to it, which significantly enhances the overall stability and load-bearing capacity of the folding mounting frame 11. As the core support, the main support 119 can distribute the weight and motion load of components such as the electric heater 12 and the connecting rod assembly, and prevent the fixed support 111 from deforming or loosening due to uneven force, thereby ensuring the reliability of the folding mounting frame 11 during frequent unfolding and folding.

[0055] like Figure 4 As shown, the air conditioning electric heating device 1 also includes a temperature sensor 15 and a distance sensor 16. The temperature sensor 15 is used to detect the air temperature inside the evaporator 200, and the distance sensor 16 is used to detect the distance between the fixed bracket 111 and the movable bracket 112.

[0056] Temperature sensor 15 can be fixedly mounted on main bracket 119. Temperature sensor 15 can be a probe-type temperature sensor, and it must be ensured that the probe part of the probe-type temperature sensor is in full contact with air. Distance sensor 16 can be an ultrasonic ranging sensor, fixedly mounted on movable bracket 112. When the distance sensor 16 is working, it continuously emits signals and receives signals reflected back from fixed bracket 111.

[0057] The work process is as follows:

[0058] Under normal operation of the unit, the computer room air conditioner 100 operates the cooling function. When the temperature sensor 15 detects that the internal temperature of the evaporator 200 is greater than the set value c, the unit is less likely to condense under this ambient temperature. At this time, the folding mounting bracket 11 needs to be in the unfolded state, and the distance between the fixed bracket 111 and the movable bracket 112 needs to be equal to the maximum value a, so as to increase the heat dissipation area of ​​the electric heater 12 and improve the cooling and heating effect of the unit.

[0059] Specifically, the distance sensor 16 detects the distance between the fixed bracket 111 and the movable bracket 112 in real time. When the distance is less than the maximum value 'a', the distance sensor 16 controls the first motor 13 and the second motor 14 to start via a program. The first motor 13 reverses, and the second motor 14 rotates forward. The reverse rotation of the first motor 13 drives the first connecting rod 113 to rotate, increasing the minimum angle between the first connecting rod 113 and the fixed bracket 111. As the first connecting rod 113 rotates, it pushes the movable bracket 112 to move away from the fixed bracket 111. During this movement, the distance sensor 16 detects the distance between the fixed bracket 111 and the movable bracket 112 in real time until it detects that the distance is equal to the maximum value 'a'. At this point, the first motor 13 and the second motor 14 stop operating, thus switching the folding mounting bracket 11 from the folded state to the unfolded state. At this time, the heat dissipation area of ​​the electric heater 12 is at its maximum, meaning that the sheet metal area exposed to the air by the electric heater 12 is at its maximum when the computer room air conditioner 100 is operating in cooling mode, resulting in the best cooling and heating effect of the unit.

[0060] When the temperature sensor 15 detects that the internal temperature of the evaporator 200 is less than the set value c, the unit is prone to condensation at this ambient temperature. At this time, the folding mounting bracket 11 needs to be in the folded state, and the distance between the fixed bracket 111 and the movable bracket 112 needs to be equal to the minimum value b. This reduces the sheet metal area of ​​the electric heater 12 exposed to the air when the computer room air conditioner 100 is operating the cooling function, thereby reducing the formation of condensate and improving the stability and cooling effect of the computer room air conditioner 100.

[0061] Specifically, the distance sensor 16 detects the distance between the fixed bracket 111 and the movable bracket 112 in real time. When the distance is greater than the minimum value b, the distance sensor 16 controls the first motor 13 and the second motor 14 to start through the program. The first motor 13 rotates forward and the second motor 14 rotates in reverse. The forward rotation of the first motor 13 drives the first connecting rod 113 to rotate, and the minimum angle between the first connecting rod 113 and the fixed bracket 111 becomes smaller. When the first connecting rod 113 rotates, it pushes the movable bracket 112 to move closer to the fixed bracket 111. During the movement, the distance sensor 16 detects the distance between the fixed bracket 111 and the movable bracket 112 in real time. When the distance sensor 16 detects that the distance between the fixed bracket 111 and the movable bracket 112 is equal to the minimum value b, the first motor 13 and the second motor 14 stop running, thereby switching the folding mounting bracket 11 from the unfolded state to the folded state. At this time, the heat dissipation area of ​​the electric heater 12 is the smallest, that is, the sheet metal area of ​​the electric heater 12 exposed to the air is the smallest when the computer room air conditioner 100 is running the cooling function. The condensation phenomenon has the least impact on the cooling effect of the unit.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electric heating device for air conditioning, characterized in that, include: The folding mounting bracket has at least two states: unfolded and folded. The drive component is capable of driving the folding mounting bracket to switch between two states: unfolded and retracted. An electric heater is provided on the folding mounting frame; When the folding mounting bracket is switched to different states of unfolding or folding, the heat dissipation area of ​​the electric heater changes accordingly.

2. The electric heating device for air conditioning according to claim 1, characterized in that, The folding mounting bracket includes a linkage assembly, a fixed bracket, and a movable bracket. The linkage assembly is movably connected to the fixed bracket and the movable bracket. Under the action of the linkage assembly, the movable bracket moves away from or closer to the fixed bracket.

3. The electric heating device for air conditioning according to claim 2, characterized in that, The linkage assembly includes a first link, a second link, a third link, and a fourth link. The two ends of the first link are rotatably connected to the fixed bracket and the movable bracket, respectively. One end of the second link is rotatably connected to the fixed bracket. One end of the third link and one end of the fourth link are rotatably connected to the movable bracket. The other ends of the second link, the third link, and the fourth link are hinged.

4. The electric heating device for air conditioning according to claim 3, characterized in that, One end of the first connecting rod is rotatably connected to the fixed bracket via a first rotating shaft, and one end of the second connecting rod is rotatably connected to the fixed bracket via a second rotating shaft.

5. An electric heating device for air conditioning according to claim 4, characterized in that, The drive assembly includes a first motor and a second motor, wherein the first motor is connected to the first rotating shaft via a transmission, and the second motor is connected to the second rotational transmission.

6. An electric heating device for air conditioning according to claim 2, characterized in that, The electric heater is provided on both the fixed bracket and the movable bracket.

7. An electric heating device for air conditioning according to claim 2, characterized in that, The folding mounting bracket also includes a main support, and the fixed support is fixedly connected to the main support.

8. An electric heating device for air conditioning according to claim 1, characterized in that, It also includes a temperature sensor for detecting the air temperature inside the evaporator.

9. An electric heating device for air conditioning according to claim 2, characterized in that, It also includes a distance sensor for detecting the distance between the fixed bracket and the movable bracket.

10. A computer room air conditioner, characterized in that, The device includes an evaporator, a fan, and an electric heating device for air conditioning as described in any one of claims 1-9. The fan is located at the bottom of the evaporator, and the electric heating device for air conditioning is located inside the evaporator. When the folding mounting bracket is in the unfolded state, the sheet metal area of ​​the electric heater exposed to the air is maximized, thereby maximizing the heat dissipation area of ​​the electric heater. When the folding mounting bracket is in the retracted state, the sheet metal area of ​​the electric heater exposed to the air is minimized, thereby minimizing the heat dissipation area of ​​the electric heater.

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