[0037] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as there is no conflict between them.
[0038] The thermal storage electric heater provided by the present invention can be used in various existing thermal storage electric heaters, and the isothermal heat release of the thermal storage electric heater is realized through the phase change layer. figure 1 , figure 2 Shows a thermal storage type electric heater according to some embodiments of the present invention.
[0039] Such as figure 1 , figure 2 As shown, in some embodiments, the thermal storage type electric heater provided by the present invention includes a main body and a phase change layer 40. The main body includes a thermal insulation shell 10 and a thermal storage body 20 arranged in the thermal insulation shell 10. The thermal insulation shell 10 can be any shape suitable for implementation. figure 1 , figure 2 In the implementation shown, the thermal insulation shell 10 is in the shape of a regular rectangular box, which is convenient for processing and use. The front side of the heat preservation shell 10 is set as an open structure, and the heat storage body 20 is arranged in the cavity of the heat preservation shell 10 in a shape-matching manner. The heat storage body 20 may be, for example, a magnesium iron heat storage brick, which is stored by the sensible heat of the heat storage brick Heat. In some embodiments, the heat storage brick is provided with a channel inside, and the heating device 30 is arranged in the channel. The heating device 30 is generally an electric heating element. One end of the heating element can be electrically connected to the MCU through a power cord for control and connection The method can be realized by using the existing technology, and will not be repeated. The heating device 30 is arranged in the heat storage body 20, which has a better heating effect and avoids uneven heating caused by the heat transfer performance of the heat storage body 20. Those skilled in the art should understand that the above-mentioned structure, connection mode, and hardware selection are only used to illustrate the present invention and do not limit the present invention. For example, the heating device 30 may also adopt other heating methods and be arranged outside the heat storage body 20, etc. The present invention does not limit this.
[0040] Such as figure 2 As shown, the thermal insulation shell 10 includes an outer shell and an insulation layer provided between the heat storage body 20 and the outer shell. The outer shell has a cavity structure with one side open, and the insulation layer is provided on the inner peripheral wall of the outer shell to protect the heat storage The body 20 is temperature-isolated to prevent the heat stored in the heat storage body 20 from dissipating from the peripheral wall of the outer shell. In some embodiments, the material of the thermal insulation layer may be calcium silicate board, aluminum silicate thermal insulation felt, ceramic fiber blanket, etc., and its thickness is 30-80 mm. The opening on the front side of the thermal insulation shell 10 forms the heating end of the electric heater. Due to the temperature isolation of the thermal insulation layer, the heat stored in the heat storage body 20 is radiated from the heating end, so as to provide heating for the user.
[0041] Continue to refer figure 2 The front side of the electric heater is the radiating end, and the radiating end is provided with a phase change layer 40. The phase change layer 40 matches the open shape of the radiating end, and the heat of the heat storage body 20 is radiated to the outside through the phase change layer 40 . Phase change refers to the transformation of a substance from one phase to another by endothermic or exothermic phase. The substance has a constant temperature endothermic or exothermic stage during the phase change, so that heat can be dissipated to the outside through the phase change layer 40 at a constant temperature. Out. In such figure 2 In the illustrated embodiment, the phase change layer 40 is in the shape of a metal plate, which includes a shell, the shell is a metal shell with high thermal conductivity, and the shell is a cavity. The cavity is filled with a composite phase change material. The composite phase change material is composed of Organic phase change materials are compounded with high thermal conductivity materials, such as foamed metal with high porosity, expanded graphite, etc. In some embodiments, the phase change layer 40 is also provided with a high thermal conductivity structure, such as a fin structure, which is provided in the cavity of the housing. The heat transfer capability of the phase change layer 40 is strengthened by the high thermal conductivity material or the high thermal conductivity structure to ensure the uniformity of the temperature in the phase change layer 40 and improve the heat release stability.
[0042] In some embodiments, the phase transition temperature of the organic phase change material ranges from 100 to 300°C. In traditional thermal storage electric heaters, the peak heat storage temperature of the thermal storage body 20 is generally 600-700°C. In the early stage of the heat release, the heat release temperature is relatively high, and the heat release decay rate is faster, resulting in the time in the comfortable temperature range It is very short, so the heat dissipation comfort is poor. In this embodiment, by setting the phase change temperature range of the organic phase change material in a comfortable heat release zone, the comfortable heat release zone is extended and the heat release comfort of the electric heater is improved. Preferably, in some embodiments, the thickness of the phase change layer 40 is 10-100 mm.
[0043] Such as figure 2 As shown, in some embodiments, a buffer heat transfer layer 50 is provided between the phase change layer 40 and the heat storage body 20. One side wall of the buffer heat transfer layer 50 is in direct contact with the wall surface of the heat storage body 20, and the opposite side Avoid direct contact between the wall surface and the phase change layer 40 side. When the electric heater emits heat, the heat of the heat storage body 20 is transferred to the phase change layer 40 through the buffer heat transfer layer 50. The heat transfer temperature of the buffer heat transfer layer 50 can be set at 200-300°C, so as to buffer the heat transfer between the phase change layer 40 and the heat storage body 20, so that the heating temperature of the phase change layer 40 is in the phase change temperature range, and the constant temperature is extended. The heat release time further improves the heat release comfort. The buffer heat transfer layer 50 may be, for example, an insulation board structure made of nanofiber materials, and its thickness ranges from 10 to 100 mm.
[0044] In some embodiments, the outer side of the phase change layer 40 is provided as a heat dissipation cavity 60. The heat dissipation cavity 60 is composed of a cavity directly in contact with the outer wall of the phase change layer 40. An air inlet 11 is provided below the heat dissipation cavity 60, and an air inlet 11 is provided above the heat dissipation cavity 60. The air outlet 12 is provided with an adjustable damper at the air outlet 12. When the electric heater is working, the adjustable air door is opened, and the indoor cold air enters the heat dissipation cavity 60 through the air inlet 11, exchanges heat with the phase change layer 40, and becomes hot air, and then enters the room through the air outlet 12, thereby preventing The room is heated, and the air inlet 11 and the air outlet 12 are arranged up and down, the chimney effect is used to make the heat dissipation effect of the electric heater better, and the heat exchange air volume can be adjusted through the adjustable damper.
[0045] image 3 Shows the heat dissipation temperature change curve of the thermal storage type electric heater in some embodiments of the present invention and the heat dissipation temperature change curve of the traditional thermal storage type electric heater. in image 3 In the middle, the horizontal axis is time, the vertical axis is the wall temperature of the radiating end of the electric heater, the dotted line is the temperature change curve of the traditional thermal storage electric heater, and the solid line is the heat dissipation temperature change curve of the thermal storage electric heater of the present invention . In the 0-8h heat storage stage, the heat storage electric heater of the present invention has the same heating time as the traditional electric heater. In the 8-24h heat release stage, the heat release rate of the traditional electric heater decays rapidly, cannot achieve isothermal heat release, and the time in the comfortable heat release zone is very short, resulting in poor heat release comfort. However, the electric heater of the present invention Due to the phase change effect of the phase change layer 40, isothermal heat release is realized, the heat release decays slowly, and the time in the comfortable heat release temperature range is long, the thermal comfort is better, and at the end of the first 24h interval, its More calories remaining. In the second heat absorption and release cycle, in the heat storage stage of 24 to 32 hours, it can be seen that the traditional electric heater still needs 8 hours of heating time, while the electric heater of the present invention only needs 6 hours due to the remaining heat. One hour of heating time can complete heat storage, reducing heating time of two hours and reducing heating energy consumption. In the heat release stage of 32 to 48 hours, the electric heater of the present invention has a longer heat release time, a slower heat release decay rate, and better thermal comfort.
[0046] The structure of the thermal storage electric heater in some embodiments of the present invention is described above, and its working principle is further explained below.
[0047] When the thermal storage type electric heater of the present invention is in use, the electric load underestimated time at night is used, and the heating device 30 is turned on to heat the thermal storage body 20. The thermal storage body 20 uses its own heat capacity to increase its temperature. Come to store heat. When the electric heater releases heat during the day, open the adjustable damper of the electric heater, so that the cold indoor air enters the heat dissipation cavity 60 through the air inlet 11 at the bottom of the electric heater, exchanges heat with the wall surface of the phase change layer 40, and then heats up into hot air. The chimney effect flows into the room from the air outlet 12 to achieve indoor heating. During the heat release process of the electric heater, the phase change layer 40 can maintain the heat release temperature within a constant temperature range due to its own phase change, thereby achieving isothermal heat release, and the heat release decay rate is slow, and the heat release effect is better. At the same time, the user can manually adjust the heat output of the electric heater by adjusting the adjustable damper, which is more convenient to use.
[0048] The structure and working principle of the thermal storage electric heater in some embodiments of the present invention have been described above. Based on the above embodiments, the thermal storage electric heater of the present invention may have other alternative embodiments.
[0049] Such as Figure 4 As shown, in some alternative embodiments, the outer side of the heat dissipation cavity 60 is further provided with an insulation layer 70. The insulation layer 70 heats the outer side wall of the heat dissipation cavity 60 to prevent heat from radiating from the outer wall of the heat dissipation cavity 60 and improve the electric heater. The exothermic effect.
[0050] Such as Figure 5 As shown, in other alternative embodiments, the phase change layer 40 includes a first phase change layer 41 and a second phase change layer 42. Two phase change layers with different phase change temperatures are provided to extend the phase change time and increase the heat release. effect. In addition, the number of phase change layers 40 may also be multiple layers, which is not limited in the present invention.
[0051] In still other alternative embodiments, the heat dissipating end of the electric heater of the present invention can be arranged on opposite sides of the electric heater, that is, two heat dissipating ends are formed by opening an open structure on the front and rear sides of the heat-preserving shell. Heat radiation on both sides, suitable for more heating scenes. Further, it is also possible to set multi-side heat release according to the heat release effect, which is not limited.
[0052] In still other alternative embodiments, the structure of the electric heater of the present invention can also be any other structure suitable for implementation. For example, the structure and wind direction of the air inlet and outlet can be set to other forms, and the heating device can be other heating methods. The shape of the electric heater is not limited to a rectangular box, etc., and the present invention does not limit it.
[0053] Obviously, the foregoing embodiments are merely examples for clear description, and are not intended to limit the embodiments. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. There is no need and cannot give an exhaustive list of all implementation methods. The obvious changes or changes derived from this are still within the protection scope of the present invention.
