Natural circulation electric heating equipment

Abstract

The utility model provides natural circulation electric heating equipment, which relates to the technical field of electric heaters, and comprises a PI heating module, a heating radiator and a PI temperature controller, the heating radiator is divided into a heating part and a heat dissipation part, the PI heating module is attached to the heating part, the heating radiator is of an annular closed structure, circulating water is arranged in the heating radiator, and the PI temperature controller is connected with the PI heating module. The heating radiator is integrated or split, and a bag type expansion tank and an automatic exhaust valve are connected to the heating radiator. The PI heating module is attached to the heating radiator with the annular closed structure, natural circulation of water is led out due to the density difference generated by heating, the natural water circulation problem of the heating radiator without a power device is solved, the electric-water heat exchange strength of the heating radiator and the heat dissipation strength of the heating radiator are enhanced through water circulation, and the heat dissipation efficiency of the heating radiator is improved. The convective circulation of the room is stabilized, and the change frequency and amplitude of the minimum thermal inertia temperature of the room are effectively controlled under the support of a heating side variable temperature control strategy.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric heating technology field especially relates to a natural circulation electric heating equipment. BACKGROUND

[0002] The electric heater for room heating is divided into radiation type electric heater and convection type electric heater according to heat transfer mode, and these two kinds of electric heaters mainly have the following problems in heating comfort and heating energy consumption:

[0003] Air heat transfer mode is adopted, and continuous heating needs greater electric power to support due to small air thermal inertia, small heat conduction coefficient and low specific heat capacity;

[0004] Direct heating mode, and water medium is in non-circulating heat exchange state, and the heating intensity of the radiator is weak, and room convection circulation cannot be formed;

[0005] The electric heating product parameter gives that the heating power consumption is generally in the range of 100~160w / m 2 , and the actual use is also the same, which is a high energy consumption product, and is only suitable for temporary or small range heating occasions, and whether it is air radiation or air convection, the electric heater product using air heat transfer without thermal inertia is not suitable for full-season room heating due to its inherent high energy consumption technical characteristics, wherein, the water injection electric heater is that the electric heating rod is inserted into the water radiator to directly heat, the direct heating mode cannot make the water in the radiator circulate, and the heating intensity cannot be increased, and the room effective convection circulation cannot be formed due to insufficient convection intensity, and the thermal inertia of water only slows down the rate of reducing the room air humidity, therefore, the utility model provides a natural circulation electric heating equipment to solve the problems in the prior art. UTILITY MODEL CONTENTS

[0006] In view of the above problems, the utility model provides a natural circulation electric heating equipment, which is characterized in that the PI heating module is attached to the radiator with annular closed structure, the density difference is generated by heating to lead to the natural circulation of water, the natural water circulation under the condition of no power device of the radiator is solved, the circulation of water enhances the electric water heat exchange intensity of the radiator and the heating intensity of the radiator, and the room convection circulation is stabilized.

[0007] To achieve the purpose of the utility model, the utility model realizes the following technical scheme: a natural circulation electric heating equipment, comprising a PI heating module, a radiator and a PI temperature controller, the radiator is divided into a heating part and a heating part, the PI heating module is attached to the heating part, the radiator is annular closed structure, and the radiator is provided with circulating water, the radiator is integrated or split, and the radiator is connected with a capsule type expansion tank and an automatic exhaust valve;

[0008] The PI heating module is electrically connected with the PI temperature controller through a wire, the PI heating module comprises a PI electrothermal film, a viscose layer and a corrugated aluminum plate, the corrugated aluminum plate is matched with the structure of the heating radiator, and the PI electrothermal film is adhered to the corrugated aluminum plate through the viscose layer.

[0009] Further improvement lies in that the PI electrothermal film is provided with a double-temperature circuit, and the double-temperature circuit is a heat preservation circuit and a temperature rising circuit respectively.

[0010] Further improvement lies in that the PI temperature controller is used for accessing room temperature, and the PI temperature controller is provided with a power module for displaying heating power in real time.

[0011] Further improvement lies in that the PI heating module is fixed to the heating radiator through bolts penetrating through the interval seams of the heating radiator or is directly pasted to the heating radiator through viscose.

[0012] Further improvement lies in that the heating radiator is integrated, and the heating radiator is a double-column heating radiator, the double-column heating radiator is a ring-shaped closed structure, the circulating water flows in the inner wall interlayer of the double-column heating radiator, one side of the double-column heating radiator is a heating part, and the other side of the double-column heating radiator is a heat dissipation part, the PI heating module is matched on the inner side of the heating part, the capsule expansion tank is connected below one end of the double-column heating radiator, and the automatic exhaust valve is arranged above the other end of the double-column heating radiator.

[0013] Further improvement lies in that the heating radiator is split, and the heating radiator comprises a double-column heat dissipation heating radiator and a double-column heating heating radiator, the double-column heat dissipation heating radiator and the double-column heating heating radiator are both ring-shaped closed structures, the circulating water flows in the inner wall interlayer of the double-column heat dissipation heating radiator and the double-column heating heating radiator, a hot water rising pipe is connected between the upper side of one end of the double-column heat dissipation heating radiator and the upper side of one end of the double-column heating heating radiator, and a hot water descending pipe is connected between the lower side of the other end of the double-column heat dissipation heating radiator and the lower side of the other end of the double-column heating heating radiator.

[0014] Further improvement lies in that the double-column heat dissipation heating radiator is a heat dissipation part, the double-column heating heating radiator is a heating part, the PI heating module is matched on the two side surfaces in the double-column heating heating radiator, the capsule expansion tank is connected below one end of the double-column heating heating radiator, and the automatic exhaust valve is arranged above the other end of the double-column heat dissipation heating radiator.

[0015] The utility model discloses the beneficial effects are:

[0016] 1. The utility model discloses a PI heating module is attached to the radiator with annular closed structure, and the natural circulation of the water is caused by the density difference of heating, the natural water circulation problem under the non-power device of the radiator is solved, and the circulation of water enhances the electric water heat exchange intensity of the radiator and the radiator heat dissipation intensity, makes the room convection circulation to be stabilized, under the support of the heating side temperature control strategy, the change frequency and amplitude of the room thermal inertia minimum temperature are effectively controlled, and the electric radiator keeps energy balance state energy-saving heating in the whole heating season.

[0017] 2. The utility model discloses a PI electric heating film is attached to the corrugated aluminum plate through the adhesive layer and constitutes the PI heating module, and the corrugation can be tightly fastened to the heating part surface of the radiator and heat, and the electric water is separated, is applicable to various room heating, can be fixed or mobile, the PI heating module adopts the bolt and is fixed with the radiator through the interval seam of the radiator or adopts the adhesive and is directly pasted to the radiator, can increase or decrease at any time, and multiple pieces are connected in parallel, when one piece breaks down, does not affect the normal work of other pieces, and the simple structure can be conveniently replaced.

[0018] 3. The utility model discloses a water in the radiator produces the density difference and leads out the natural circulation after heating, and the radiator can be integral type or split type, and the integral type is double -column radiator with annular closed channel, and one side column surface attaches the PI heating module and is used as the heating part and the ascending surface, and the other side column surface is used as the heat dissipation part, and the density difference of water on both sides of the column surface causes the natural circulation of water after heating, and constitutes the natural circulation electric radiator, and the split type is arranged double -column heat dissipation radiator, double -column heating radiator, and is connected through hot water ascending pipe, hot water descending pipe, and double -column heating radiator attaches the PI heating module and is used as the heating part, and double -column heat dissipation radiator is used as the heat dissipation part, and the water is heated and produces the density difference and drives the water flow and forms the closed natural circulation after heating, makes the convection intensity and the heat dissipation of the radiator get the promotion, and is suitable for different application scenes. ACCURACY

[0019] Figure 1 It is the PI temperature controller schematic diagram of the utility model;

[0020] Figure 2 It is the integral type radiator schematic diagram of the utility model;

[0021] Figure 3 It is the integral type radiator side schematic diagram of the utility model;

[0022] Figure 4 It is the split type radiator schematic diagram of the utility model;

[0023] Figure 5 It is the split type radiator side schematic diagram of the utility model.

[0024] Wherein: 1, PI heating module; 2, PI temperature controller; 3, bladder expansion tank; 4, automatic exhaust valve; 5, PI electrothermal film; 6, adhesive layer; 7, wave-shaped aluminum plate; 8, bolt; 9, double-column radiator; 10, double-column heat dissipation radiator; 11, double-column heating radiator; 12, hot water rising pipe; 13, hot water descending pipe. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the utility model, the utility model will be further described in the following combined with examples, and the examples are only used to explain the utility model and do not constitute the limitation of the protection scope of the utility model.

[0026] Example one

[0027] According to Figure 1 , 2 , 3, the embodiment proposes a natural circulation electric radiator, which comprises a PI heating module 1, a radiator and a PI temperature controller 2, the radiator is divided into a heating part and a heat dissipation part, the PI heating module 1 is attached to the heating part, the radiator is of a ring-shaped closed structure, and a circulating water is arranged in the radiator, and the radiator is connected with a bladder expansion tank 3 and an automatic exhaust valve 4;

[0028] The PI heating module 1 is electrically connected with the PI temperature controller 2 through wires, the PI heating module 1 comprises a PI electrothermal film 5, an adhesive layer 6 and a wave-shaped aluminum plate 7, the wave shape of the wave-shaped aluminum plate 7 is matched with the structure of the radiator, and the PI electrothermal film 5 is adhered to the wave-shaped aluminum plate 7 through the adhesive layer 6. In use, the PI heating module 1 is attached to the radiator with a ring-shaped closed structure, the natural circulation of water is caused by the density difference generated by heating, the problem of natural water circulation under the condition that the radiator is without a power device is solved, the circulation of water enhances the electric water heat exchange intensity of the radiator and the heat dissipation intensity of the radiator, the room convection circulation is stabilized, under the support of the heating side temperature control strategy, the change frequency and amplitude of the minimum temperature of the room thermal inertia are effectively controlled, the electric radiator is energy-saving and heating under the energy balance state in the whole heating season. The radiator has a wall thickness of >2.0 mm, the inner and outer parts of the radiator are subjected to corrosion and oxygen corrosion treatment, the radiator adopts micro-positive pressure natural circulation, is provided with the bladder expansion tank 3, and the micro-vacuum oxygen corrosion caused by the temperature difference is avoided, and is provided with the automatic exhaust valve 4, which automatically exhausts the excess gas.

[0029] The PI electrothermal film 5 is provided with a double-temperature circuit, and the double-temperature circuit is a heat preservation circuit and a temperature rising circuit respectively. The room temperature control is directly associated with the input power of the PI electrothermal film 5, so that the input power is balanced with the room heating load. The PI electrothermal film 5 is provided with a double-temperature circuit, one of which is a heat preservation circuit accounting for 40% of the total heating power, and the other is a temperature rising circuit accounting for 60% of the total power, that is, the basic continuous heating power is maintained, and the unnecessary adjustment power of the temperature controller is reduced. While the heating circuit adopts double control and double temperature, the micro adjustment of +5℃ is allowed, so that the PI heating power is closer to the room load. The PI electrothermal film 5 itself has strong waterproofness, and the waterproof treatment of the joint is the key. The external probe and joint are welded by point red glue, and the PI polyimide insulated wire and waterproof joint are used, and the leakage protection switch is installed. The PI electrothermal film 5 is made of polyimide film as an external insulator and nickel-chromium alloy etching heating sheet as an internal conductive heating body, and is formed by high temperature and high pressure heat sealing. The polyimide electrothermal film has excellent insulation strength, electric strength, heat conduction efficiency and excellent resistance stability, and the thickness is only 0.1-0.3mm, has flexibility, can be bent, has overall insulation and waterproof performance, and can be applied to humid environment.

[0030] The PI temperature controller 2 is used to access the room temperature, and the PI temperature controller 2 is provided with a power module for real-time display of heating power. The heating and adjustment power of the heating radiator can be observed at any time, the heating temperature can be accurately adjusted, a double control and double temperature temperature controller is adopted, the room temperature control is associated with the input power, the effective control of the input power is improved, the heating of the heating radiator is stabilized, the switching control frequency of the temperature controller is reduced, and invalid heating caused by excessive room thermal inertia fluctuation is avoided. In the PI temperature controller 2 control, the room temperature control is associated with the PI heating module 1 temperature control: when the room temperature is less than 18℃, the electric temperature is 110℃; when the room temperature is greater than or equal to 18℃, the electric temperature is 95℃; when the room temperature is greater than or equal to 22℃, the power is off, the room temperature falls to 18℃, the electric temperature is 95℃, and the work is restored... If the room temperature falls to less than 18℃, the electric temperature is 110℃ and the work is restored.

[0031] The PI heating module 1 is fixed to the heating radiator by screwing 8 through the spacing gap of the heating radiator or directly pasted to the heating radiator by adhesive. The PI heating module 1 is fixed to the heating radiator by screwing 8 through the spacing gap of the heating radiator or directly pasted to the heating radiator by adhesive, which can be increased or decreased at any time, and multiple pieces are connected in parallel. When one piece fails, it does not affect the normal work of other pieces, and the structure is simple and can be conveniently replaced.

[0032] The heating radiator is integrated, and the heating radiator is a double-column heating radiator 9, the double-column heating radiator 9 is a ring-shaped closed structure, the circulating water flows in the inner wall interlayer of the double-column heating radiator 9, one side of the double-column heating radiator 9 is a heating part, and the other side of the double-column heating radiator 9 is a heat dissipation part, the PI heating module 1 is attached to the inner side of the heating part, the bladder expansion tank 3 is connected below one end of the double-column heating radiator 9, and the automatic exhaust valve 4 is arranged above the other end of the double-column heating radiator 9. The integrated double-column heating radiator 9 has a ring-shaped closed channel, one side of the column surface is attached to the PI heating module 1 as a heating part and an upward surface, and the other side of the column surface is a heat dissipation part. The density difference of water on both sides of the heated column surface causes natural circulation of water, and a natural circulation electric heating radiator is formed.

[0033] Embodiment two

[0034] According to Figure 1 、 4 , 5, the embodiment provides a natural circulation electric heating radiator device, which comprises a PI heating module 1, a heating radiator and a PI temperature controller 2. The heating radiator is divided into a heating part and a heat dissipation part. The PI heating module 1 is attached to the heating part. The heating radiator is a ring-shaped closed structure, and the heating radiator is internally provided with circulating water. The heating radiator is connected with a bladder expansion tank 3 and an automatic exhaust valve 4.

[0035] The PI heating module 1 is electrically connected with the PI temperature controller 2 through wires. The PI heating module 1 comprises a PI electrothermal film 5, a viscose layer 6 and a wave-shaped aluminum plate 7. The wave shape of the wave-shaped aluminum plate 7 is matched with the structure of the heating radiator. The PI electrothermal film 5 is attached to the wave-shaped aluminum plate 7 through the viscose layer 6. In use, the PI heating module 1 is attached to the heating radiator with a ring-shaped closed structure. The density difference caused by heating leads to natural circulation of water, solves the problem of natural water circulation of the heating radiator without a power device, enhances the electric water heat exchange strength of the heating radiator and the heat dissipation strength of the heating radiator, stabilizes the room convection circulation, and effectively controls the frequency and amplitude of the lowest temperature of the thermal inertia of the room under the support of the heating side temperature control strategy, so that the electric heating radiator can maintain energy balance state for energy-saving heating in the whole heating season. The wall thickness of the heating radiator should be greater than 2.0 mm. The inside and outside of the heating radiator are subjected to corrosion and oxygen corrosion treatment. The heating radiator adopts micro-positive-pressure natural circulation, is provided with the bladder expansion tank 3, and avoids micro-vacuum oxygen corrosion caused by temperature difference. The automatic exhaust valve 4 is arranged to automatically exhaust excess gas.

[0036] The PI electrothermal film 5 is provided with a double-temperature circuit, and the double-temperature circuit is a heat preservation circuit and a temperature rising circuit respectively. The room temperature control is directly associated with the input power of the PI electrothermal film 5, so that the input power is balanced with the room heating load. The PI electrothermal film 5 is provided with a double-temperature circuit, one of which is a heat preservation circuit accounting for 40% of the total heating power, and the other is a temperature rising circuit accounting for 60% of the total power, that is, the basic continuous heating power is maintained, and the unnecessary adjustment power of the temperature controller is reduced. While the heating circuit adopts double control and double temperature, the micro adjustment of +5℃ is allowed, so that the PI heating power is closer to the room load. The PI electrothermal film 5 itself has strong waterproofness, and the waterproof treatment of the joint is the key. The external probe and joint are welded by point red glue, and the PI polyimide insulated wire and waterproof joint are used. The earth leakage protection switch is installed. The PI electrothermal film 5 is made of polyimide film as an external insulator and nickel-chromium alloy etched heating sheet as an internal conductive heating body, and is formed by high temperature and high pressure heat sealing. The polyimide electrothermal film has excellent insulation strength, electric strength, heat conduction efficiency and excellent resistance stability, and the thickness is only 0.1-0.3mm, has flexibility, can be bent, has overall insulation and waterproof performance, and can be applied to humid environment.

[0037] The PI temperature controller 2 is used to access the room temperature, and the PI temperature controller 2 is provided with a power module for real-time display of heating power. The heating and adjustment power of the heating radiator can be observed at any time, the heating temperature can be accurately adjusted, a double control and double temperature temperature controller is adopted, the room temperature control is associated with the input power, the effective control of the input power is improved, the heating of the heating radiator is stabilized, the switching control frequency of the temperature controller is reduced, and invalid heating caused by excessive room thermal inertia fluctuation is avoided. In the PI temperature controller 2 control, the room temperature control is associated with the PI heating module 1 temperature control: when the room temperature is less than 18℃, the electric temperature is 110℃; when the room temperature is greater than or equal to 18℃, the electric temperature is 95℃; when the room temperature is greater than or equal to 22℃, the power is off, the room temperature falls to 18℃, the electric temperature is 95℃, and the work is restored... If the room temperature falls to less than 18℃, the electric temperature is 110℃ and the work is restored.

[0038] The PI heating module 1 is fixed to the heating radiator by screwing 8 through the spacing gap of the heating radiator or directly pasted to the heating radiator by adhesive. The PI heating module 1 is fixed to the heating radiator by screwing 8 through the spacing gap of the heating radiator or directly pasted to the heating radiator by adhesive, which can be increased or decreased at any time, connected in parallel with multiple pieces, and when one piece fails, it does not affect the normal work of other pieces, and the structure is simple and can be conveniently replaced.

[0039] The heating radiator is split type, and the heating radiator comprises double-column heat dissipation heating radiator 10 and double-column heating heating radiator 11, the double-column heat dissipation heating radiator 10 and the double-column heating heating radiator 11 are annular closed structures, the circulating water flows in the inner wall interlayer of the double-column heat dissipation heating radiator 10 and the double-column heating heating radiator 11, a hot water rising pipe 12 is connected between the upper side of one end of the double-column heat dissipation heating radiator 10 and the upper side of one end of the double-column heating heating radiator 11, and a hot water descending pipe 13 is connected between the lower side of the other end of the double-column heat dissipation heating radiator 10 and the lower side of the other end of the double-column heating heating radiator 11. The double-column heat dissipation heating radiator 10 is a heat dissipation part, the double-column heating heating radiator 11 is a heating part, the PI heating module 1 is attached to the two side surfaces inside the double-column heating heating radiator 11, the bladder expansion tank 3 is connected to the lower side of one end of the double-column heating heating radiator 11, and the automatic exhaust valve 4 is arranged at the upper side of the other end of the double-column heat dissipation heating radiator 10. The split type is to arrange the double-column heat dissipation heating radiator 10 and the double-column heating heating radiator 11 in an up-down mode, connect through the hot water rising pipe 12 and the hot water descending pipe 13, attach the double-column heating heating radiator 11 to the PI heating module 1 as a heating part, and attach the double-column heat dissipation heating radiator 10 as a heat dissipation part. After the water is heated, the specific gravity difference drives the water flow to form a closed natural circulation, so that the convection intensity and the heat dissipation amount of the heating radiator are improved, and different application scenarios are suitable.

[0040] The natural circulation electric heating device pastes the PI heating module 1 on the heating radiator with the annular closed structure, the natural circulation of water is driven by the density difference generated by heating, the problem of the natural water circulation of the heating radiator under the non-powered device is solved, the water circulation enhances the electric water heat exchange strength of the heating radiator and the heat dissipation strength of the heating radiator, the room convection circulation is stabilized, under the support of the heating side temperature variation control strategy, the variation frequency and amplitude of the lowest temperature of the room thermal inertia are effectively controlled, the electric heating maintains the energy balance state to realize the energy-saving heating in the whole heating season. The PI electric heating film 5 is pasted to the wave-shaped aluminum plate 7 through the adhesive layer 6 to form the PI heating module 1, the wave shape can be tightly matched to the heating surface of the heating radiator to heat, the electric water is separated, the PI heating module 1 is suitable for various room heating, can be fixed or moved, the PI heating module 1 is fixed through the bolt 8 penetrating the interval gap of the heating radiator or is directly pasted to the heating radiator through the adhesive, the number of the PI heating modules 1 can be increased or decreased at any time, a plurality of PI heating modules 1 are connected in parallel, when one of the PI heating modules 1 fails, the normal work of other PI heating modules 1 is not affected, the structure is simple and the PI heating module 1 can be conveniently replaced. Meanwhile, the water in the heating radiator generates the density difference to drive the natural circulation after being heated, the heating radiator can be integrated or split, the integrated heating radiator is the double-column heating radiator 9 with the annular closed channel, one side column surface pastes the PI heating module 1 as the heating part and the rising surface, the other side column surface is the heat dissipation part, the density difference of the water on the two sides of the column surface after being heated drives the natural circulation of the water, the natural circulation electric heating radiator is formed, the split heating radiator is the double-column heat dissipation heating radiator 10 and the double-column heating heating radiator 11 arranged in the upper and lower positions and connected through the hot water rising pipe 12 and the hot water descending pipe 13, the double-column heating heating radiator 11 pastes the PI heating module 1 as the heating part, the double-column heat dissipation heating radiator 10 is the heat dissipation part, the water generates the density difference to drive the water flow to form the closed natural circulation after being heated, the convection intensity and the heat dissipation amount of the heating radiator are improved, and the split heating radiator is suitable for different application scenes.

[0041] The basic principle, main features and advantages of the utility model are shown and described. The skilled in the art should understand that the utility model is not limited by the above examples, the above examples and the description in the specification only illustrate the principle of the utility model, under the premise of not departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall into the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A natural circulation electric heating device, comprising a PI heating module (1), a radiator, and a PI thermostat (2), characterized in that: The radiator is divided into a heating part and a heat dissipation part. The PI heating module (1) is attached to the heating part. The radiator has a ring-shaped closed structure and is equipped with circulating water. The radiator is either integrated or split. The radiator is connected to a bladder-type expansion tank (3) and an automatic air vent valve (4). The PI heating module (1) is electrically connected to the PI thermostat (2) via wires. The PI heating module (1) includes a PI heating film (5), an adhesive layer (6), and a corrugated aluminum plate (7). The waveform of the corrugated aluminum plate (7) is matched with the structure of the radiator. The PI heating film (5) is adhered to the corrugated aluminum plate (7) via the adhesive layer (6).

2. The natural circulation electric heating device according to claim 1, characterized in that: The PI electric heating film (5) is provided with a dual-temperature circuit, which is a heat preservation circuit and a heat-raising circuit.

3. The natural circulation electric heating device according to claim 1, characterized in that: The PI thermostat (2) is used to connect to room temperature, and the PI thermostat (2) is equipped with a power module for real-time display of heating power.

4. A natural circulation electric heating device according to claim 1, characterized in that: The PI heating module (1) is fixed to the radiator by bolts (8) passing through the gaps in the radiator or by adhesive.

5. A natural circulation electric heating device according to claim 1, characterized in that: The radiator is an integral unit and is a double-column radiator (9). The double-column radiator (9) has a closed ring structure. The circulating water flows in the inner wall interlayer of the double-column radiator (9). One side of the double-column radiator (9) is the heating part, and the other side of the double-column radiator (9) is the heat dissipation part. The PI heating module (1) is attached to the inner side of the heating part. The bladder-type expansion tank (3) is connected to the lower part of one end of the double-column radiator (9). The automatic air vent (4) is located above the other end of the double-column radiator (9).

6. A natural circulation electric heating device according to claim 1, characterized in that: The radiator is a split type, and the radiator includes a double-column heat dissipation radiator (10) and a double-column heating radiator (11). Both the double-column heat dissipation radiator (10) and the double-column heating radiator (11) are annular closed structures. The circulating water flows in the inner wall interlayer of the double-column heat dissipation radiator (10) and the double-column heating radiator (11). A hot water riser pipe (12) is connected between the top of one end of the double-column heat dissipation radiator (10) and the top of one end of the double-column heating radiator (11). A hot water downpipe (13) is connected between the bottom of the other end of the double-column heat dissipation radiator (10) and the bottom of the other end of the double-column heating radiator (11).

7. A natural circulation electric heating device according to claim 6, characterized in that: The double-column heat dissipation radiator (10) is the heat dissipation part, the double-column heating radiator (11) is the heating part, the PI heating module (1) is attached to both sides inside the double-column heating radiator (11), the bladder-type expansion tank (3) is connected to the lower part of one end of the double-column heating radiator (11), and the automatic exhaust valve (4) is located above the other end of the double-column heat dissipation radiator (10).

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