CN204593882U - A kind of electric heating stove with fast installation support - Google Patents
A kind of electric heating stove with fast installation support Download PDFInfo
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- CN204593882U CN204593882U CN201520281806.2U CN201520281806U CN204593882U CN 204593882 U CN204593882 U CN 204593882U CN 201520281806 U CN201520281806 U CN 201520281806U CN 204593882 U CN204593882 U CN 204593882U
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Abstract
The utility model provides a kind of electric heating stove with fast installation support, it at least one heater comprising fast installation support, shell and be arranged on described enclosure; Described heater comprise be arranged side by side many heat-transfer pipes, be folded in the multiple PTC ceramic heating element between every two heat-transfer pipes and surround the protective cover of described heat-transfer pipe and PTC ceramic heating element, described fast installation support comprises connection bracket, locating support, three fixed arms longitudinally arranged and is arranged on the gusseted part for supporting described shell of described fixed arm bottom.The utility model structure is simple, and firing rate is fast, and efficiency is high, and is provided with heat-insulation layer, high insulating effect, can reach the effect of saving the energy, and by means of fast installation support, can realize wall type and hang, installation rate is fast, easy to use.
Description
Technical field
The utility model relates to electric heating technical field of heating, is specifically related to a kind of electric heating stove with fast installation support.
Background technology
In the northern area of China there is heating demand in winter, urban area adopts the mode of coal fired central heating usually, but it is high to there is heat supply efficiency low cost cost in this mode, pipe network popularity rate is limited, many gardens, one residential and many families the problems such as urban development demand can not be met, so can not be linked in the pipe network of central heating.Still the mode such as fire coal or natural gas is adopted to carry out in units of family from heating in urban parts area and vast rural area family, this also exists the problem of environmental pollution on the one hand, another aspect is also easy causes burning insufficient because air is unobstructed not, thus causes anthracemia accident to happen occasionally.Traditional coal heating stove is not easy to heat at times, is unfavorable for energy-conservation, and seriously polluted.
Increasingly serious along with the energy and environmental problem, the development trend of winter heating shifts to electric heating mode gradually.Also occurred electro-thermal steam stove on the market, but there is product structure complexity, the problems such as water power is not separated, electric conversion efficiency is low, make this series products fail to obtain penetration and promotion.
The electrical heating technique of the electricity separation that PTC ceramic heat technology makes grows up gradually.PTC is a kind of novel semiconductor ceramic material, and it is based on barium titanate, and infiltrate many kinds of substance aft-loaded airfoil and form, heating efficiency is higher.There is Curie temperature in PTC, when its temperature is lower than design temperature, its resistance value can raise with its temperature and diminish; When its temperature is higher than design temperature, its resistance value becomes large with its temperature rising.Due to the above-mentioned characteristic of this ceramic material, do not need special temperature controller and thermal resistance thermocouple equitemperature sensor to carry out temperature feedback and can carry out heating control to heater, it is the material behavior leaning on self that its temperature regulates, thus enables product temperature automatically controlled and have the service life much larger than other heater.Further, it can the change of environmentally temperature regulate the thermal power of self to export, so it can by the power consumption optimal control of heater minimum, the material of high heating efficiency also significantly improves the utilization ratio of electric energy simultaneously.
With the electric heater unit that PTC ceramic heating element is core component in prior art, generally include shell and the electric control chamber wherein arranged, electrical heating room and outlet pipe and oral siphon, at least one PTC ceramic heating element is provided with in described electrical heating room, PTC ceramic heating element is isolated with heating tube and is connected with external power source, also be provided with a dividing plate water inlet and delivery port to be separated, dividing plate is provided with water hole.The advantages such as this PTC electric heater unit has the flames of anger, unglazed consumption, quick heating, power consumption is low, thermal effect is high, the life-span is long.
But current PTC heating stove is because Curie temperature is higher than device tolerable temperature, may occur that when water shortage appears in heating stove temperature raises, thus occur do not reach Curie temperature but because of particular device not withstand high temperatures and occur damage.On the other hand, the general volume of existing heating stove is comparatively large, installs, uses and move all very inconvenient, most of heating stove is all that placement is motionless, cannot carry out Fast Installation suspension, and when installing more multiple heating stove, floor space is comparatively large, adds set-up time and financial cost.
Utility model content
Cannot Fast Installation and easily occur the shortcoming that high fever is damaged in order to what solve that the above-mentioned existing heating stove mentioned exists, a kind of electric heating stove with fast installation support is provided, it has anti-dry, the function such as antifreeze, and be provided with fast installation support, quick suspension installation can be carried out, Wen Zhong, electric heating stove is referred to as heating stove.
Concrete, the utility model provides a kind of electric heating stove with fast installation support, and it comprises mounting bracket, shell, at least one heater being arranged on described enclosure and Control Component;
Described heater comprises the many heat-transfer pipes be arranged side by side, multiple PTC ceramic heating element and surrounds the protective cover of described heat-transfer pipe and PTC ceramic heating element, wherein,
Multiple PTC ceramic heating element is folded with between every two heat-transfer pipes, described PTC ceramic heating element is divided into three groups, loop is formed respectively with three-phase alternating-current supply assembly electrical communication, thus heating and stopping heating under the control of Control Component, PTC ceramic heating external body is coated with electric insulation enamelled coating;
Described fast installation support comprises the connection bracket of horizontally set, the locating support of horizontally set, three fixed arms for fixing described connection bracket and locating support longitudinally arranged and the gusseted part for supporting described shell being arranged on described fixed arm bottom.
Preferably, described fixed arm top is provided with suspension arrangement.
Preferably, two ends of described connection bracket and locating support are respectively arranged with projection, the top of described fixed arm is provided with the groove with described male cooperation, described projection can be plugged in described inside grooves, described connection bracket and locating support are fixed on the top of described fixed arm by described projection and groove, and described shell is fixed on the bottom of described fixed arm by described gusseted part and described suspension arrangement.
Preferably, the top of described fast installation support is provided with the mounting-positioning holes for fixing described connection bracket and locating support.
Preferably, described protective cover inner surface is provided with heat-insulation layer.
Preferably, described many heat-transfer pipes are by means of the outlet pipe be transversely arranged on respectively above and below heater and oral siphon parallel communication, and described heat-transfer pipe is three-decker, and innermost layer is copper, and intermediate layer is alloy aluminium lamination, and outermost layer is electric insulation enamelled coating.
Preferably, described heater comprises first heater, secondary heating mechanism and the 3rd heater, and described first heater, secondary heating mechanism and the 3rd heater are mutually electrically in parallel and water route is in parallel.
Preferably, the cross section of described heat-transfer pipe is circular, oval or square.
Preferably, described heater is provided with multiple PTC ceramic heating element and is coated on multiple heat-transfer pipes of described multiple PTC ceramic heating external body, the inner and outer wall of described multiple heat-transfer pipe is configured for the hollow structure flowed through that supplies water, and is provided with seal between described multiple PTC ceramic heating element and described multiple heat-transfer pipe.
The utility model structure is simple, and firing rate is fast, and efficiency is high, and is provided with heat-insulation layer, high insulating effect, can reach the effect of saving the energy, and by means of fast installation support, can realize wall type and hang, installation rate is fast, easy to use.Heating stove can realize Fast Installation by fast installation support, easy to use.
Accompanying drawing explanation
Fig. 1 shows the work pipe network schematic diagram of the utility model heating stove;
Fig. 2 shows the schematic diagram of fast installation support of the present utility model;
Fig. 3 shows the structural representation of fast installation support of the present utility model;
Fig. 4 shows the internal structure schematic diagram of the utility model heating stove;
Fig. 5 is Tu4Zhong A district amplification view, shows the internal structure of the utility model heater;
Fig. 6 shows the annexation schematic diagram of the utility model heat-transfer pipe; And
Fig. 7 shows the schematic diagram of the utility model Control Component.
Detailed description of the invention
Below in conjunction with accompanying drawing, implementation of the present utility model is described in detail.
Electric heating stove with fast installation support of the present utility model is applied to central heating or individual heating, and Fig. 1 shows heating stove of the present utility model for work pipe network schematic diagram during individual heating.Visible in figure, heating stove 1 receives the water processed through demineralized water treatment device 2 and is transported to after electrical heating in multiple radiators 5 of connecting in pipe network, and the water flowing through multiple radiator is lowered the temperature gradually, is pumped back to heating stove 1 through water pump 7.Demineralized water treatment device 2 ensure that in heating stove pipe network and heats non-scaling for a long time, extends the service life of heating stove.In pipe network, have a small amount of current lose, therefore in water pump 7 upstream, expansion tank 4 is set as water replanishing device.The water outlet of heating stove is provided with automatic exhaust steam valve 3, is in suitable level with the steam pressure automatically controlled in heating stove pipe network.Maintenance water valve 6 is set outside the water in-out port of heating stove respectively, for cutting off current when keeping in repair heating stove.
Below in conjunction with Fig. 2 and Fig. 3, the structure of fast installation support and using method are described further:
This heating stove can by means of quick support or on the spot support realize wall-hanging or console mode and install.Fast installation support 300 as shown in Figure 2 need be adopted during wall-hanging installation.Quick support comprises the connection bracket 34 of horizontally set, the longitudinal fixed arm 32 arranged of locating support 35, three, three longitudinal fixed arms 32 are fixedly connected with support 34 and locating support 35 jointly, fixed arm 32 bottom is provided with the gusseted part 30 supporting heating stove shell 111, and adjacent two gusseted parts 30 support the shell 111 of a heating stove.
As shown in Figure 3, two ends of connection bracket 34 and locating support 35 are respectively arranged with protruding 301, the two ends on the top of each fixed arm 32 are respectively arranged with and protruding 301 grooves 302 coordinated, each projection 301 is plugged in a groove 302, connection bracket 34 and locating support 35 are fixed on the top of fixed arm 32 by protruding 301 and groove 302, connection bracket 34, locating support 35 and three fixed arms 32 longitudinally arranged are combined as the fast installation support 300 that a group is installed heating stove, locating support 35 is for connecting location by multiple fast installation support 300, thus by multiple stage heating stove with fixed intervals location and installation together.Shell 111 is fixed on the bottom of fixed arm 32 by the horizontal support end face on gusseted part 30 and the suspension arrangement 303 that is arranged on fixed arm 32 top, heating stove 1 is by means of the fixed structure at top, as fixing hole, be fixed on be positioned at fast installation support fixed arm 32 above two suspension arrangements 303 on, suspension arrangement is such as hook formation.
When mounted, carry out quick position by locating support 35, fast installation support 300 is fixed on load-bearing wall by bolt 31.And by three fixed arm 32 support and connection supports 34 and locating support 35, fixed arm 32 is installed by bolt 31, fixed arm 32 bottom is provided with the gusseted part 30 supporting heating stove shell 111, and adjacent two gusseted parts 30 support the shell 111 of a heating stove.Heating stove can realize Fast Installation by fast installation support 300, easy to use.
Below in conjunction with Fig. 4, Fig. 5 and Fig. 6, the internal structure of heating stove 1 is described.
Heating stove 1 totally comprises shell 111 and the power supply module 11 wherein arranged, Control Component 12, at least one heater 13, small-power pumping installations 14, oral siphon 15, outlet pipe 16, demineralized water treatment device 2, water replanishing device 4 and automatic exhaust steam valve 3.Heater 13 entirety is in flat rectangular body, and be provided with many heat-transfer pipes 17 side by side in it, many heat-transfer pipes 17 realize parallel communication by means of the outlet pipe 16 be transversely arranged on respectively above and below heater 13 and oral siphon 15.
Many heat-transfer pipe 17 UNICOMs in parallel, current enter from the water inlet 8 being positioned at oral siphon 15 one end through pumping, flow to all heat-transfer pipes along P direction as shown by the arrows in Figure 6 simultaneously, import the delivery port 9 being positioned at outlet pipe 16 afterwards, are admitted to pipe network.Due to being arranged in parallel of many heat-transfer pipes, the heat transfer pipe gross area, much larger than the bore of outlet pipe 16 and oral siphon 15, can form certain hydraulic pressure to delivery port, play the effect of current speedup.Therefore the mode that is arranged in parallel makes heating stove 1 Inlet and outlet water flow large, is suitable for large area heat supply, is particularly suitable for many groups and arranges formation central heating thermal source.
When many heat-transfer pipes 17 are longitudinally arranged side by side, heat-transfer pipe 17 inside due to cold water at below hot water up, there is vortex phenomenon in pipeline, be conducive in short duct length, realize fully heating.
As shown in Figure 5, heat-transfer pipe 17 is three-decker, and innermost layer is copper pipe 18, and intermediate layer is alloy aluminium lamination 19, and outermost layer is electric insulation enamelled coating 191.Heat-transfer pipe, by increasing alloy aluminium lamination 19, increases rate of heat transfer, makes the heat-transfer pipe of all parallel connections within the extremely short time, the water in pipe can be heated to suitable temperature.The cross section of heat-transfer pipe is the cross sectional shape be applicable to such as circular, oval or square, and outlet pipe 16 and oral siphon 15 are preferably circular copper pipe.
Heat-transfer pipe 17 is made by existing pipe fitting forming technique, such as stretching, injection technique, preferably adopts solid-liquid roller technology of pricking to be shaped.Outlet pipe 16 and oral siphon 15 adopt existing pipe fitting forming technique, and at heat-transfer pipe relevant position apertured and heat-transfer pipe Flange joint, connecting portion arranges seal.
Multiple PTC ceramic heating element 20 is folded with between every two heat-transfer pipes 17, electrode 24 is provided with between every two PTC ceramic heating elements 20, PTC ceramic heating element 20 is divided into three groups by lead-in wire by electrode 24, form loop with three-phase alternating-current supply assembly electrical communication respectively, the controlled assembly of power supply module controls thus makes the controlled heating of PTC ceramic heating element under suitable condition and stop heating.If the lead-in wire of certain PTC ceramic heating element 20 breaks, then system cut-off gives open-phase protection.
PTC ceramic heating element 20 outside is coated with electric insulation enamelled coating 21.Electric insulation enamelled coating 21 adopts high resistance mineral crystal high-temperature pressure-proof filmogen to be matrix, and with Alpha-alumina, silicon nitride or high mica sheet etc. for filler, electricity separation is reliable, increases security of system and durability.
In another embodiment, heater 13 is provided with multiple PTC ceramic heating element 20 and is coated on multiple heat-transfer pipes 17 of multiple PTC ceramic heating element 20 outside, the inner and outer wall of multiple heat-transfer pipe 17 is configured for the hollow structure flowed through that supplies water, and is provided with seal between the multiple heat-transfer pipe 17 of multiple PTC ceramic heating element 20 and institute.The inwall of heat-transfer pipe 17 is three-decker, and innermost layer is copper pipe 18, and intermediate layer is alloy aluminium lamination 19, and outermost layer is electric insulation enamelled coating 191.
As shown in Figures 4 and 5, aluminium alloy protective cover 22 arranges and covers the periphery of many heat-transfer pipes 17 and multiple PTC ceramic heating element 20.Aluminium alloy protective cover 22 is on the whole in flat rectangular body, and the position of corresponding PTC ceramic heating element 20 on its flat surface, the position namely between corresponding two heat-transfer pipes 17, is provided with narrow gap 131.
The inner surface of aluminium alloy protective cover 22 is provided with heat-insulation layer 23, and heat-insulation layer 23 adopts high-temperature insulation insulation material, such as senior centrifugal glass fibre silk flosssilk wadding.
In shell 111, small-power pumping installations 14 is arranged in appropriate location, flowing and accelerating, preventing from blocking pipe network and avoiding dry combustion method for making heating stove 1 inner fluid.
Water softening device 2, water replanishing device and expansion tank 4 is arranged in the inside of shell 111, and the water pump 7 in Fig. 4 shown in dotted line can be arranged in device outside for the consideration that device is compact.
Heating stove 1 of the present utility model can in shell 111 before and after stacked three heaters 13 are set, each heater 13 is mutually electrically in parallel and water route is in parallel, thus make Control Component 12 can control respectively three heaters 13 start one of them, two or three, thus meet the different heating demands of people.Control Component 12 adopts step-by-step movement timesharing throw-in play to control heater 13, and such heater 13 can drop at random according to load variations or quit work, and reduces the impact to electrical network.Control Component 12 equally also manually can open, stop the number of heater, facilitates user from the power of Row sum-equal matrix heating stove 1.
Control Component 12 is connected with the circuit of heating stove 1 and designs as shown in Figure 7.As seen from Figure 7, Control Component 12 and control panel 25, temperature sensor 27, pyrostat 28, pump motor 29, PTC ceramic heating element 20 are electrically connected, complete following control model: under heating stove 1 holding state, user adopts three kinds of modes to control heating stove 1 by the different control button of control panel 25 to heat, the first is constant temperature mode, is controlled by set temperature set point; The second is Time-sharing control pattern, controls by arranging the heating period; And the third is anti-freezing pattern, namely heating stove 1 acquiescence is in holding state, will describe in detail below.
Under the first starts thermostatic control button mode, temperature sensor 27 gathers room temperature, when room temperature is lower than temperature set-point, the Control Component 12 of heating stove 1 makes the electrode loop of PTC ceramic heating element 20 connect, PTC ceramic heating element 20 generates heat, for pipe network provides heat recirculated water, thus reach the object of heating.
Under the second starts Time-sharing control button mode, Control Component 12 makes PTC ceramic heating element 20 electrode loop connect within the heating period arranged, and PTC ceramic heating element 20 generates heat, and for pipe network provides heat recirculated water, thus reaches the object of heating.The carrying out practically period of the second time-shared fashion can by user's sets itself, such as user can be arranged on the different heating period and heat, can be 4:00-7:00,16:00-20:00 and the 23:00-0:00 time period heats, or also can be heat 3:00-7:00,10:00-12:00 and the 17:00-21:00 time period.In the second mode, if environment temperature is down to 5 degrees Celsius when the non-heating period, then Control Component 12 starts antifreeze operation, makes PTC ceramic heating element 20 electrode loop connect a period of time, prevents heating stove pipe network from freezing damage.
The third starts antifreeze button mode, and namely heating stove acquiescence is in holding state, when environment temperature then starts heating lower than 5 degrees Celsius, prevents heating stove pipe network from freezing damage.Each control model adopts circuit design means of the prior art to realize.
This heating stove comprises triple overheat protective function.The small-power water pump 14 be arranged in the shell 111 of heating stove 1 can make the Inner eycle water of heating stove 1 accelerate flowing, prevents that pipe network from blocking, dry combustion method, thus pipe network can be protected not easily overheated, and this is first heavily to protect.When pyrostat 28 collects heating stove 1 high temperature signal, such as 105 DEG C time, Control Component 12 is forced to disconnect PTC ceramic heating element 20 electrode loop, thus reaches the object of further overtemperature protection, and this is second heavily to protect.The Curie temperature of PTC ceramic heating element 20 itself can overtemperature protection, the high temperature signal temperature value that the Curie temperature of usual PTC ceramic heating element itself sets higher than pyrostat, and this is triple protection.
This heating stove also has creepage protection function and dry burning protection function.After Control Component 20 detects power supply electrical leakage, automatically cut off the power supply of heating stove 1; When water level is shut down lower than during the lowest limit water level set; Supply voltage abnormity protection function, when unusual fluctuations appear in supply voltage, auto-breaking.
When this heating stove is for transforming the coal heating boiler room of traditional form, usual multiple stage heating stove series and parallel uses, and increases water yield further, forms central heating system.The quantity that heating stove is equipped with is determined according to heating area, also relevant with the house insulation performance in heating region.Very roughly, every square meter heating area needs to be equipped with 60w heating equipment.The rated power of a heating stove 1 is 15-40kw.For the ease of controlling, also arrange central controller to monitor the heating system be cascaded, central controller can monitor the room temperature of respective user in pipe network, when the room temperature of certain user in pipe network starts heating stove 1 lower than during design temperature, when the room temperature of users all in pipe network is all higher than heating stove 1 out of service during design temperature.Central controller also can set heating interval, thus carries out heating operation in the set time section of every day.
This heating stove can realize wall-hanging or console mode installation by means of fast installation support 300, accurate positioning, quick for installation, easy to use, the set-up time of the heating stove before decreasing, make the installation of heating stove more convenient, fast installation support 300 structure is simple, be arranged side by side, multiple heating stove can be installed, reach and save installing space, economical and practical object.
Last it is noted that above-described each embodiment is only for illustration of the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in previous embodiment, or to wherein partly or entirely technical characteristic carry out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (9)
1., with an electric heating stove for fast installation support, it comprises fast installation support, shell, at least one heater being arranged on described enclosure and Control Component, it is characterized in that:
Described heater comprises the many heat-transfer pipes be arranged side by side, multiple PTC ceramic heating element and surrounds the protective cover of described heat-transfer pipe and described PTC ceramic heating element, wherein,
Multiple PTC ceramic heating element is folded with between every two heat-transfer pipes, described PTC ceramic heating element is divided into three groups, loop is formed respectively with three-phase alternating-current supply assembly electrical communication, thus heating and stopping heating under the control of Control Component, PTC ceramic heating external body is coated with electric insulation enamelled coating;
Described fast installation support comprises the connection bracket of horizontally set, the locating support of horizontally set, three fixed arms for fixing described connection bracket and locating support longitudinally arranged and the gusseted part for supporting described shell being arranged on described fixed arm bottom.
2. the electric heating stove with fast installation support according to claim 1, is characterized in that: described fixed arm top is provided with suspension arrangement.
3. the electric heating stove with fast installation support according to claim 2, it is characterized in that: two ends of described connection bracket and locating support are respectively arranged with projection, the top of described fixed arm is provided with the groove with described male cooperation, described projection can be plugged in described inside grooves, described connection bracket and locating support are fixed on the top of described fixed arm by described projection and groove, and described shell is fixed on the bottom of described fixed arm by described gusseted part and described suspension arrangement.
4. the electric heating stove with fast installation support according to claim 1, is characterized in that: the top of described fast installation support is provided with the mounting-positioning holes for fixing described connection bracket and locating support.
5. the electric heating stove with fast installation support according to claim 1, is characterized in that: described protective cover inner surface is provided with heat-insulation layer.
6. the electric heating stove with fast installation support according to claim 5, it is characterized in that: described many heat-transfer pipes are by means of the outlet pipe be transversely arranged on respectively above and below heater and oral siphon parallel communication, described heat-transfer pipe is three-decker, innermost layer is copper, intermediate layer is alloy aluminium lamination, and outermost layer is electric insulation enamelled coating.
7. the electric heating stove with fast installation support according to claim 5, it is characterized in that: described heater comprises first heater, secondary heating mechanism and the 3rd heater, described first heater, secondary heating mechanism and the 3rd heater are mutually electrically in parallel and water route is in parallel.
8. the electric heating stove with fast installation support according to claim 6, is characterized in that: the cross section of described heat-transfer pipe is for circular, oval or square.
9. the electric heating stove with fast installation support according to claim 8, it is characterized in that: described heater is provided with multiple PTC ceramic heating element and is coated on multiple heat-transfer pipes of described multiple PTC ceramic heating external body, the inner and outer wall of described multiple heat-transfer pipe is configured for the hollow structure flowed through that supplies water, and is provided with seal between described multiple PTC ceramic heating element and described multiple heat-transfer pipe.
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| CN201520281806.2U CN204593882U (en) | 2015-05-04 | 2015-05-04 | A kind of electric heating stove with fast installation support |
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| CN201520281806.2U CN204593882U (en) | 2015-05-04 | 2015-05-04 | A kind of electric heating stove with fast installation support |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708318A (en) * | 2019-01-11 | 2019-05-03 | 北京帅安节能设备有限公司 | A kind of full-automatic heating electric boiler of step-by-step movement and its use, heating means |
| CN112178748A (en) * | 2020-10-09 | 2021-01-05 | 徐松 | Electric heating device using semiconductor ceramic |
-
2015
- 2015-05-04 CN CN201520281806.2U patent/CN204593882U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708318A (en) * | 2019-01-11 | 2019-05-03 | 北京帅安节能设备有限公司 | A kind of full-automatic heating electric boiler of step-by-step movement and its use, heating means |
| CN109708318B (en) * | 2019-01-11 | 2023-11-28 | 北京帅安节能设备有限公司 | Stepping full-automatic heating electric boiler and using and heating methods thereof |
| CN112178748A (en) * | 2020-10-09 | 2021-01-05 | 徐松 | Electric heating device using semiconductor ceramic |
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