CN212657782U - Electric heat storage device with multiple heat sources for heat supply - Google Patents
Electric heat storage device with multiple heat sources for heat supply Download PDFInfo
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- CN212657782U CN212657782U CN202021783904.3U CN202021783904U CN212657782U CN 212657782 U CN212657782 U CN 212657782U CN 202021783904 U CN202021783904 U CN 202021783904U CN 212657782 U CN212657782 U CN 212657782U
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- 238000005338 heat storage Methods 0.000 title claims description 66
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 238000004321 preservation Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 5
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- 239000000463 material Substances 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 abstract description 19
- 230000005611 electricity Effects 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
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- 239000012774 insulation material Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000011232 storage material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
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Abstract
An embodiment of the utility model provides an electric heat accumulation device of many heat sources heat supply relates to heat energy technical field. It includes the heat preservation cavity, heat energy drive type heat pump, gas-liquid heat exchanger, low-grade heat collector, place the heat accumulation medium of heat preservation cavity in the heat exchanger and, the heat accumulation medium passes through heating element and links to each other with outside power supply unit, gas-liquid heat exchanger installs in the heat preservation cavity and communicates with outside feed line, the air outlet at gas-liquid heat exchanger is installed to heat energy drive type heat pump, low-grade heat collector is installed outside the heat preservation cavity, the heat exchanger links to each other and installs in the heat preservation cavity with low-grade heat collector, the heat preservation cavity is sealed chamber, the low temperature air of gas-liquid heat exchanger exhaust is through heat accumulation medium and heat exchanger behind the heat energy drive. The embodiment of the utility model provides an electric heat accumulation device of many heat sources heat supply has realized thermal step utilization, has improved thermal utilization efficiency, reduces the power consumption cost.
Description
Technical Field
The utility model relates to a heat energy technical field especially relates to an electric heat accumulation device of many heat sources heat supply.
Background
With the rapid development of the power industry, more and more power station systems emerge in China. During the power consumption peak period, the load is reduced, so that a large amount of off-peak electricity is remained, the power product is characterized in that production, supply and marketing are completed simultaneously, and the large amount of off-peak electricity is remained, so that the waste of power resources is caused, and the energy conservation and the environmental protection are not facilitated. Therefore, the off-peak electricity and the peak electricity adopt different electricity prices to urge people to use electricity by staggering peaks, the energy utilization rate is improved, and the waste is reduced.
In cold winter and industrial production, hot water or hot oil is commonly used, and electric heating is traditionally adopted to provide hot water and hot oil. Some electric heat storage devices have been developed, in which low-price valley electricity is converted into heat energy by a heating element and stored in a heat storage medium; in the peak electricity stage with the highest price, the heat of the heat storage medium is transferred to media such as water and heat conducting oil by using media such as air, and the like, so that hot water or hot oil is supplied to users and industrial producers, and the electricity cost is reduced. However, the existing electric heat storage device has low heat storage efficiency and still has high power consumption.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an electric heat accumulation device of many heat sources heat supply for solve life among the prior art and the defect that the power consumption of industrial hot water hot oil is with high costs, realize the off-peak power consumption, improve heat accumulation efficiency.
The embodiment of the utility model provides an electric heat storage device with multiple heat sources for heat supply, which comprises a heat preservation cavity, a heat energy driving type heat pump, a gas-liquid heat exchanger, a low-grade heat collector, a heat exchanger and a heat storage medium arranged in the heat preservation cavity, the heat storage medium is connected with external power supply equipment through a heating element, the gas-liquid heat exchanger is arranged in the heat preservation cavity and is communicated with an external liquid supply pipe, the heat energy driving type heat pump is arranged at the air outlet of the gas-liquid heat exchanger, the low-grade heat collector is arranged outside the heat preservation cavity body, the heat exchanger is connected with the low-grade heat collector and is arranged in the heat-insulating cavity which is a sealed cavity, and the low-temperature air discharged by the gas-liquid heat exchanger passes through the heat energy driving type heat pump, then passes through the heat storage medium and the heat exchanger, and exchanges heat with the fluid in the gas-liquid heat exchanger again.
According to the utility model discloses an electric heat accumulation device of many heat sources heat supply of embodiment, heating element's one end is installed inside the heat accumulation medium, heating element's the other end stretches out the heat preservation cavity.
According to the utility model discloses an electric heat accumulation device of many heat sources heat supply of embodiment, heating element is a plurality of.
According to the utility model discloses an electric heat accumulation device of many heat sources heat supply of embodiment, the heat preservation cavity includes outer wall and inner wall, the outer wall is located the outside of inner wall, the inner wall with the accommodation space intussuseption that the outer wall formed after linking to each other is filled with insulation material.
According to the utility model discloses an electric heat storage device of many heat sources heat supply of embodiment, any kind in magnesia brick, steel ball, fused salt and paraffin is adopted to the heat accumulation medium.
According to the utility model discloses an electric heat accumulation device of many heat sources heat supply, the drive heat pump of heat energy is the weiler mil heat pump, wherein, the well warm chamber and the high temperature chamber of weiler mil heat pump are located in the heat preservation cavity, the room temperature chamber of weiler mil is located outside the heat preservation cavity, the well warm chamber of weiler mil heat pump is located gas-liquid heat exchanger's air outlet.
According to the utility model discloses an electric heat accumulation device of many heat sources heat supply still includes circulating fan, the drive heat pump of heat energy is located circulating fan's impeller with between gas-liquid heat exchanger's the gas outlet.
According to the utility model discloses an electric heat accumulation device of many heat sources heat supply of embodiment, circulating fan includes impeller, pivot and driving piece, the driving piece is located the heat preservation cavity is outside, the impeller is for laying high temperature impeller in the heat preservation cavity, high temperature impeller passes through the pivot with the driving piece links to each other.
According to the utility model discloses an electric heat storage device of many heat sources heat supply, when the heat source temperature is higher than required heat flow temperature, the heat exchanger is installed the air-out side of heat accumulation medium, when the heat source temperature is less than required heat flow temperature, the heat exchanger is installed the air inlet side of heat accumulation medium.
The embodiment of the utility model provides an electric heat storage device of many heat sources heat supply, introduce heat energy drive type heat pump and low-grade heat collector in electric heat storage device, absorb heat from the low temperature heat source and emit the heat that the several times is the energy consumption at the high temperature heat source, reduced electric heat storage device's power consumption, reduce the power consumption cost; meanwhile, low-temperature air coming out of the gas-liquid heat exchanger enters the heat energy driving type heat pump for preheating and then enters the heat storage medium and the heat exchanger with higher temperature, so that the gradient utilization of heat is realized, the utilization efficiency of heat is improved, and the electric energy consumption is further reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electric heat storage device for supplying heat from multiple heat sources according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electric heat storage device for supplying heat from multiple heat sources according to another embodiment of the present invention.
Reference numerals:
10. a heat preservation cavity; 11. an outer wall; 12. an inner wall; 13. a thermal insulation material; 20. a thermal energy driven heat pump; 21. a room temperature cavity; 22. a medium temperature cavity; 23. a high temperature chamber; 30. a gas-liquid heat exchanger; 31. a liquid flow passage; 40. a low grade heat collector; 50. a heat exchanger; 60. a thermal storage medium; 70. a heating element; 80. a circulating fan; 81. an impeller; 82. a rotating shaft; 83. a drive member.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "first" and "second" are used for clearly indicating the numbering of the product parts and do not represent any substantial difference unless explicitly stated or limited otherwise. The directions of "up", "down", "left" and "right" are all based on the directions shown in the attached drawings. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
The structure of the electric heat storage device for multi-heat source heating according to the embodiment of the present invention will be described with reference to fig. 1 and 2. The heating object may be any desired fluid such as liquid or gas, and the embodiment of the present invention is not limited specifically. For example, the fluid may be domestic water or industrial oil. For convenience of description, hot water is used as an example for explanation.
As shown in fig. 1, the electric heat storage device for supplying heat from multiple heat sources according to the embodiment of the present invention includes a heat preservation cavity 10, a heat energy driven heat pump 20, a gas-liquid heat exchanger 30, a low-grade heat collector 40, a heat exchanger 50, and a heat storage medium 60. The heat storage medium 60 is arranged in the heat preservation cavity 10, and the heat storage medium 60 is connected with the external power supply equipment through the heating element 70. The external power supply device is electrically connected to the heating element 70, heats the heat storage medium 60 by the heating element 70, and stores heat in the heat storage medium 60. The heat energy driven type heat pump 20 is installed at an air outlet of the gas-liquid heat exchanger 30. The low-grade heat collector 40 is positioned outside the heat preservation cavity 10, and the heat exchanger 50 is positioned in the heat preservation cavity 10 and connected with the low-grade heat collector 40. The gas-liquid heat exchanger 30 is installed in the heat-insulating cavity 10 and is communicated with an external liquid supply pipe. The heat preservation cavity 10 is a sealed cavity, and low-temperature air discharged from the gas-liquid heat exchanger 30 passes through the heat energy driven heat pump 20, then passes through the heat storage medium 60 and the heat exchanger 50, and exchanges heat with fluid in the gas-liquid heat exchanger 30 again. As shown in fig. 1, the gas-liquid heat exchanger 30 includes a liquid flow passage 31, and both ends of the liquid flow passage 31 extend outward of the insulating chamber 10.
It should be noted that the sequence of the circulating air passing through the heat exchanger 50 and the heat storage medium 60 is not particularly limited, and the circulating air may pass through the heat exchanger 50 and then the heat storage medium 60, or the air may pass through the heat storage medium 60 and then the heat exchanger 50, according to the difference between the required fluid temperature and the heat source temperature. The low-grade heat collector 40 absorbs low-grade heat such as external solar energy or waste heat, and transfers the heat to the circulating air in the heat insulating cavity 10 through the heat exchanger 50.
During the use, in the off-peak electricity stage, heat energy drive type heat pump 20 and low-grade heat collector 40 operation, heating element 70 continuously heats heat storage medium 60, converts electric energy into heat energy storage in heat storage medium 60, and the air of gas-liquid heat exchanger 30 exhaust simultaneously is tentatively heaied up through heat energy drive type heat pump 20, then takes place heat exchange through heat exchanger 50 and heat storage medium 60 and forms the high temperature air, the heat exchange of low temperature water in high temperature air and the gas-liquid heat exchanger 30 to provide required hot water for the user. The air released in the gas-liquid heat exchanger 30 is preheated again by the heat energy driven heat pump 20, and then undergoes heat exchange with the heat storage medium 60 by the heat exchanger 50, and hot water is supplied in a circulating reciprocating manner. In the peak power phase, the heating element 70 stops heating, the heat energy driven heat pump 20 and the low-grade heat collector 40 continue to operate, low-temperature air from the gas-liquid heat exchanger 30 enters the heat energy driven heat pump 20 for preheating, and further enters the heat exchanger 50 and the heat storage medium 60 for absorbing heat to form high-temperature air, the temperature of the high-temperature air is reduced after the high-temperature air exchanges heat with fluid inside the gas-liquid heat exchanger 30 in the gas-liquid heat exchanger 30, and the high-temperature air circulates in sequence.
The embodiment of the utility model provides an electric heat storage device of many heat sources heat supply, low ebb electricity with low price passes through heating element 70 and converts the electric energy into heat energy and stores in heat accumulation medium 60, and heat drive formula heat pump 20 adopts heat energy as drive power, compares the steam compression heat pump of electric drive, further reduces electric energy consumption; in the peak electricity stage with the highest price, the air in the heat preservation cavity 10 circularly flows, and the low-temperature fluid at the user side is heated by the air in the gas-liquid heat exchanger 30; meanwhile, the low-grade heat collector 40 absorbs solar energy or industrial waste heat, and transfers the heat to the circulating air in the heat-insulating cavity 10 through the heat exchanger 50, so that the consumption of electric energy is further reduced. According to the electric heat storage device for supplying heat by multiple heat sources, the heat energy driving type heat pump 20 and the low-grade heat collector 40 are introduced into the electric heat storage device, heat is absorbed from a low-temperature heat source, and heat which is several times of energy consumption is released from a high-temperature heat source, so that the power consumption of the electric heat storage device is reduced, and the power consumption cost is reduced; meanwhile, the low-temperature air coming out of the gas-liquid heat exchanger 30 enters the heat energy driven heat pump 20 to be preheated, and then enters the heat storage medium 60 and the heat exchanger 50 with higher temperature, so that the gradient utilization of heat is realized, the utilization efficiency of heat is improved, and the further reduction of electric energy consumption is facilitated.
Specifically, the heat-driven heat pump 20 is a vuilleumier heat pump, and includes a room-temperature cavity 21, a medium-temperature cavity 22, and a high-temperature cavity 23, where the room-temperature cavity 21 is located outside the heat-insulating cavity 10, the medium-temperature cavity 22 and the high-temperature cavity 23 are located inside the heat-insulating cavity 10, and the medium-temperature cavity 22 is arranged corresponding to an air outlet of the gas-liquid heat exchanger 30. The low-temperature air from the gas-liquid heat exchanger 30 enters the middle-temperature cavity 22 of the heat energy driven type heat pump 20 for preheating, then enters the heat storage medium 60 with higher temperature and the high-temperature cavity 23 for absorbing heat to form high-temperature air, the high-temperature air exchanges heat with the fluid in the gas-liquid heat exchanger 30 to release heat, and the fluid absorbs the heat to supply to users. The thermal storage medium 60 and the high temperature chamber 23 may be thermally connected, but is not particularly limited thereto.
Wherein, one end of the heating element 70 is installed inside the heat storage medium 60, and the other end of the heating element 70 extends out of the heat preservation cavity 10. As shown in fig. 1, the heating element 70 extends transversely through the entire thermal storage medium 60 and extends through the insulated cavity 10 to the outside of the insulated cavity 10 for connection to the electrical leads of an external power supply.
In addition to any of the above embodiments, the heating element 70 may be provided in plurality. A plurality of heating elements 70 are arranged in parallel to facilitate connection to electrical leads of an external power supply. Of course, the plurality of heating elements 70 may be arranged in different directions, for example, some of the heating elements 70 are arranged in the transverse direction, and other heating elements 70 are arranged in the longitudinal direction, so that the heat storage medium 60 is heated by the plurality of heating elements 70 at the same time, and the heat storage medium 60 stores a large amount of heat quickly, and the temperature is raised quickly.
The heat insulation cavity 10 comprises an outer wall 11 and an inner wall 12, the outer wall 11 is located on the outer side of the inner wall 12, and a heat insulation material 13 is filled in an accommodating space formed between the inner wall 12 and the outer wall 11. As shown in fig. 1, the inner wall 12 and the outer wall 11 are connected to each other and form a certain accommodating space therebetween, and the accommodating space is filled with a thermal insulation material 13 to prevent heat from being diffused outward and improve the utilization rate of heat energy. The thermal insulation material 13 may be any one or a combination of more of polyester foam, glass wool and rock wool, and the embodiment of the present invention is not limited in this respect.
In the embodiment of the present invention, the heat storage medium 60 is made of solid heat storage materials such as magnesium bricks and steel balls, or phase-change heat storage materials such as molten salt and paraffin, and has high heat storage density. For example, the thermal storage medium 60 is formed by stacking a plurality of magnesia bricks or steel blocks. For example, the heat storage medium 60 is a high-temperature molten salt, and the high-temperature molten salt is stored in a case-like structure. Of course, a thermochemical or adsorptive heat storage material may be used as the heat storage medium 60.
On the basis of any one of the above embodiments, the embodiment of the utility model provides an electric heat storage device of many heat sources heat supply still includes circulating fan 80, and the driving heat pump 20 of heat energy is installed between circulating fan 80's impeller and gas-liquid heat exchanger 30's gas outlet. As shown in fig. 1, the low-temperature air discharged from the air outlet of the gas-liquid heat exchanger 30 is preheated by the middle temperature chamber 22 of the heat energy driven heat pump 20 such as a vuilleumier heat pump, and then flows in the reverse direction by the circulating fan 80 to exchange heat with the heat storage medium 60 to form high-temperature air. The circulating fan 80 can effectively control the air flowing direction in the heat preservation cavity 10, and the air flowing through the middle temperature cavity 22 is prevented from directly flowing back to the gas-liquid heat exchanger 30 to cause heat exchange, so that the heat utilization rate is reduced.
Specifically, as shown in fig. 1, the circulation fan 80 includes an impeller 81, a rotating shaft 82, and a driving member 83. The impeller 81 is arranged in the heat insulation cavity 10, and in order to adapt to high-temperature air in the heat insulation cavity 10, the impeller 81 is made of high-temperature resistant materials. The driving member 83 can be a rotary motor or other rotary driving member, the driving member 83 is located outside the thermal insulation cavity 10, and the driving end of the driving member is connected with the impeller 81 through the rotating shaft 82. The rotating shaft 82 is rotatably installed on the wall surface of the heat-insulating cavity 10, and the joint is sealed to prevent air from escaping.
Where the heat exchanger 50 is mounted on the air outlet side of the thermal storage medium 60 when the heat source temperature is higher than the required heat flow temperature, as shown in figure 1. When the heat source temperature is lower than the required heat flux temperature, the heat exchanger 50 is installed on the intake side of the thermal storage medium 60 as shown in fig. 2. As shown in fig. 1, when the temperature of the heat source is higher than the required heat flow temperature, the heat exchanger 50 is installed on the left side, during the off-peak electricity period, the electric energy is converted into the heat energy through the heating element 70 and the heat energy driven heat pump 20, the heat energy is stored in the heat storage medium 60, the circulating fan 80 is continuously operated, and the circulating air circulates counterclockwise inside the heat preservation cavity 10 to perform the heat transfer function; meanwhile, low-grade heat such as solar energy, industrial waste heat, etc. collected by the low-grade heat collector 40 is also stored in the heat storage medium 60. During peak electricity periods, the heating element 70 stops working and the thermal drive type heat pump 20 and low grade heat collector 40 remain in continuous operation; the low-temperature air from the gas-liquid heat exchanger 30 enters the heat energy driven heat pump 20 to be preheated, and further enters the heat storage medium 60 through the impeller 81 of the circulating fan 80, and then enters the heat exchanger 50. The high-temperature air discharged from the heat exchanger 50 is subjected to heat exchange with the fluid inside the air-liquid heat exchanger 30, and then the temperature of the air is reduced, and the air is circulated in sequence. The low temperature fluid is introduced from the fluid inlet of the liquid flow passage 31, heated by the high temperature air passing through the gas-liquid heat exchanger 30, and then discharged from the fluid outlet to be supplied to the user. Similarly, as shown in fig. 2, when the heat source temperature is lower than the required heat flow temperature, the heat exchanger 50 is installed on the right side, and the operation of the heat exchanger in the valley power and peak power phases is similar to that of the heat exchanger in the above description and will not be described again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. An electric heat storage device with multiple heat sources for heat supply is characterized by comprising a heat preservation cavity, a heat energy driven type heat pump, a gas-liquid heat exchanger, a low-grade heat collector, a heat exchanger and a heat storage medium arranged in the heat preservation cavity, the heat storage medium is connected with external power supply equipment through a heating element, the gas-liquid heat exchanger is arranged in the heat preservation cavity and is communicated with an external liquid supply pipe, the heat energy driving type heat pump is arranged at the air outlet of the gas-liquid heat exchanger, the low-grade heat collector is arranged outside the heat preservation cavity body, the heat exchanger is connected with the low-grade heat collector and is arranged in the heat-insulating cavity which is a sealed cavity, and the low-temperature air discharged by the gas-liquid heat exchanger passes through the heat energy driving type heat pump, then passes through the heat storage medium and the heat exchanger, and exchanges heat with the fluid in the gas-liquid heat exchanger again.
2. A multi-source thermal electric storage apparatus according to claim 1, wherein one end of said heating element is mounted within said thermal storage medium and the other end of said heating element extends out of said holding chamber.
3. A multi-heat-source thermal electric storage apparatus according to claim 2, wherein said heating element is plural.
4. A multi-heat-source heat supply electric heat storage device according to claim 1, wherein the heat-preservation cavity comprises an outer wall and an inner wall, the outer wall is located outside the inner wall, and a containing space formed by the inner wall and the outer wall is filled with a heat-preservation material.
5. A multi-heat-source heat supply electric heat storage device according to claim 1, wherein the heat storage medium is any one of magnesia bricks, steel balls, molten salts and paraffin.
6. An electric heat storage device supplied by multiple heat sources according to any one of claims 1 to 5, wherein the heat-driven heat pump is a Viller Miller heat pump, wherein a medium-temperature cavity and a high-temperature cavity of the Viller Miller heat pump are located in the heat-preserving cavity, a room-temperature cavity of the Viller Miller is located outside the heat-preserving cavity, and the medium-temperature cavity of the Viller Miller heat pump is located at an air outlet of the gas-liquid heat exchanger.
7. An electric heat storage device supplied by a plurality of heat sources according to any one of claims 1 to 5, further comprising a circulating fan, wherein the heat-driven heat pump is located between an impeller of the circulating fan and an air outlet of the gas-liquid heat exchanger.
8. A multi-heat-source heat supply electric heat storage device according to claim 7, wherein the circulating fan comprises an impeller, a rotating shaft and a driving member, the driving member is located outside the heat-preservation cavity, the impeller is a high-temperature impeller arranged in the heat-preservation cavity, and the high-temperature impeller is connected with the driving member through the rotating shaft.
9. A multi-heat-source heated electrical thermal storage apparatus according to any one of claims 1 to 5, wherein the heat exchanger is mounted on the air outlet side of the thermal storage medium when the heat source temperature is above the required heat flux temperature and on the air inlet side of the thermal storage medium when the heat source temperature is below the required heat flux temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021783904.3U CN212657782U (en) | 2020-08-24 | 2020-08-24 | Electric heat storage device with multiple heat sources for heat supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021783904.3U CN212657782U (en) | 2020-08-24 | 2020-08-24 | Electric heat storage device with multiple heat sources for heat supply |
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| CN212657782U true CN212657782U (en) | 2021-03-05 |
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| CN202021783904.3U Active CN212657782U (en) | 2020-08-24 | 2020-08-24 | Electric heat storage device with multiple heat sources for heat supply |
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