KR20090105641A - Low energy consuming electric boiler having improved heat exchanger - Google Patents

Abstract

PURPOSE: A low energy electric boiler with an improved heat exchanger is provided to prevent the heat exchanger from being rotted and broken by preventing a heating unit from being connected with the heat exchanger. CONSTITUTION: A low energy electric boiler with an improved heat exchanger(120). The heat exchanger has a base plate(124), a supporting pipe(128) and a heater(122). The supporting pipe is vertically extended to the top inner surface of a storing tank from the top of the base plate. The heater includes a heating coil(132). The heating coil is rolled in the radial outer side of the supporting pipe. The both terminals of the heating coil are located on the bottom of the base plate.

Description

LOW ENERGY CONSUMING ELECTRIC BOILER HAVING IMPROVED HEAT EXCHANGER}

The present invention relates to an electric boiler of the indirect heating method, and more particularly, a heat exchange layer made of ceramic powder heated by the radiant heat of the heating coil and the heat exchange by the indirect heating method using the radiant heat of the heating coil, and storage By providing a circulation tube that maximizes contact with the water stored and circulated in the tank, high thermal efficiency can be obtained, allowing the water in the storage tank to be heated to the target temperature in a short time, and the service life of the heat exchanger can be extended. A low power electric boiler having an improved heat exchanger is provided.

In general, a boiler is a device that generates heat energy using fuel or electricity such as oil or gas as an energy source, and heats water with the generated heat energy to generate heating water or hot water, depending on the energy source, an oil boiler or a gas boiler. And electric boilers.

Boilers using fuels such as petroleum and gas as energy sources burn the fuel, so many components are used for storing, supplying, burning, and exhausting fuels. There is this. In addition, in order to prevent the gas poisoning caused by the leakage of the exhaust gas and the supply of air required for combustion of fuel, a separate boiler room must be provided, which is well ventilated and separated from the heating zone. There is a problem that the length of the pipe is complicated and long, so that the loss of thermal energy is large and the workability is reduced. In the case of the gas boiler, there is a cumbersome and inconvenient problem that requires periodic inspection of the burner and the pipe because gas poisoning and explosion accidents may occur due to the leakage of gas.

Compared to the above-described oil boilers and gas boilers, electric boilers are widely used because they use electricity as an energy source, and thus are easy to install and operate, and there is no danger of explosion or toxic gas and noise and odor are not generated.

The electric boiler is composed of a storage tank for storing the water supplied from the water supply source, and an electric heater for heating in direct contact with the water stored and circulated in the storage tank, the heated water is supplied as heating water or domestic hot water.

However, the above-described direct heating type electric boiler has disadvantages in that thermal efficiency decreases due to corrosion of the heat exchanger and the life of the heat exchanger is not long.

As the cause of the thermal efficiency deterioration, calcium carbonate, scale or corrosion on the surface of the heat exchanger prevents smooth heat transfer, and copper alloy, which is used most as a heat exchanger, is chemically changed in water and eluted in water by hydrogen carbonate. In addition, since it reacts with ammonium ions and chloride ions to cause corrosion, the performance of the heat exchanger is degraded and requires more power consumption.

In addition, the long life of the heat exchanger is due to the heat exchanger rupture, the cause of the rupture is due to the phenomenon that the calcium carbonate or scale sticks to the heat exchanger. The calcium carbonate or scale stuck to the heat exchanger interferes with the smooth heat transfer and prevents the smooth transfer of heat, keeping the copper surface at a high temperature, and the heat exchanger ruptures due to the high temperature.

The present invention has been made to solve the above conventional problems, the object of the present invention is made of a ceramic powder which is heated by the radiant heat of the heating coil at the same time the heat exchange by the indirect heating method using the radiant heat of the heating coil. By providing a heat transfer layer and a circulation pipe for maximizing contact with water stored and circulated in the storage tank, high thermal efficiency can be obtained, allowing the water in the storage tank to be heated to a target temperature in a short time, and using a heat exchanger. It is to provide a low power electric boiler having an improved heat exchanger that can extend the life.

In order to achieve the object of the present invention as described above, the present invention,

An electric boiler having a storage tank, a heat exchanger disposed in the storage tank and indirectly contacting water stored and circulated in the storage tank to heat the water.

Heat exchanger;

A base plate, a support tube body having a conventional tubular shape and extending vertically from an upper end of the base plate onto an upper inner surface of the storage tank; A heating unit having a heating coil; And

The bottom plate and the ceiling plate have a general tubular shape, and the lower end is spaced apart from the upper end of the base plate and the upper end extends upward through the upper end of the support tube, and has an annular shape extending horizontally toward the center side on the lower and upper inner circumferential surfaces. A lower support tube is formed on the inner circumferential surface of the bottom plate and extends to the top of the base play, and has a heat transfer tube having an upper support tube extending downward through the upper end of the support tube body on the inner circumferential surface of the ceiling plate. In addition, the upper end provides a low-power electric boiler having an improved heat exchanger made of a protective tube portion having a closed tube and the outer peripheral surface adjacent to the lower end is inserted into the inner peripheral surface of the upper support tube.

Preferably, a bobbin made of a common ceramic material is provided on the radially outer side of the support tube so that the heating coil can be easily fixed, and the bobbin is wound with the heating coil.

A base is integrally mounted to the base plate, and a terminal disposed under the base plate is electrically connected to a controller for controlling the electric boiler to form a closed circuit.

In addition, at least one circulation pipe is vertically disposed between the heat transfer pipe and the lower support pipe and the upper support pipe, and the circulation pipe is mounted through the bottom plate and the ceiling plate.

The circulation pipe is horizontally extended to the central side of the heat transfer pipe on the inner circumferential surface of the heat transfer pipe and supported by a plurality of support brackets having an annular shape, and the inner circumferential surface of any one support bracket is in close contact with the outer circumferential surface of the upper support pipe. Between the outer circumferential surface, the inner circumferential surface of the heat transfer tube, and the support brackets in close contact with the outer circumferential surface of the ceiling plate and the upper support tube, a first heat transfer layer made of ordinary ceramic powder is provided. On the inner circumferential surface of the cover tube, a second heat transfer layer made of ordinary ceramic powder is fixed so as not to interfere with the heat generating portion.

Preferably, the storage tank is hollow inside and the bottom has an open shape, the water supply pipe is mounted on one side adjacent to the bottom, the discharge pipe is mounted on the upper end, the open bottom of the storage tank is closed by the base plate.

More preferably, the outside of the storage tank is provided with a case surrounding the storage tank so as not to interfere with the open bottom, the insulation is filled between the case and the storage tank.

As described above, according to the present invention, since the heat generating portion having the heating coil is not directly contacted with the water stored and circulated in the storage tank, the heat exchanger can be prevented from being corroded or ruptured.

In addition, by including the first heat transfer layer made of ceramic powder and the second heat transfer layer in the cover tube and the second heat transfer tube surrounding the heat generating portion, the thermal efficiency can be increased, and by providing one or more circulation tubes penetrating the second heat transfer layer, The contact area with the water stored and circulated in the storage tank can be maximized, so that the water in the storage tank can be heated in a short time.

Hereinafter, a low power electric boiler having an improved heat exchanger according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a partial cross-sectional perspective view of a low power electric boiler having an improved heat exchanger according to the present invention.

Hereinafter, the left side of the drawing will be described as one side and the right side of the drawing as the other side, and the upper part of the drawing will be described with the lower part of the drawing as the lower part.

Referring to FIG. 1, the electric boiler 100 according to the present invention includes a storage tank 110 in which water is stored and circulated therein, and water disposed in the storage tank 110 and stored and circulated in the storage tank 110. Heat exchanger 120 indirectly in contact with the water to heat.

Storage tank 110 has a hollow inside and the bottom is open, one side adjacent to the lower end of the storage tank 110 is equipped with a water supply pipe 112, the upper end of the storage tank 110 is heated hot water Guide discharge pipe 114 is mounted.

As anyone can see, the water supply pipe 112 is connected to a water supply source, for example, a conventional water pipe (not shown), and the discharge pipe 114 is a conventional hot water valve (not shown) and a conventional heating device (not shown). Not connected).

As illustrated in FIG. 1, the storage tank 110 is preferably formed in a cylindrical shape, but the shape of the storage tank 110 is not limited to the cylindrical shape.

On the other hand, the outside of the storage tank 110 is provided with a case 116 surrounding the storage tank 110 so as not to interfere with the open bottom, the insulating material 118 is filled between the case 116 and the storage tank 110. do.

The heat exchanger 120 is fixedly mounted in the storage tank 110 formed as described above.

FIG. 2 is a cross sectional view taken along the line A-A of FIG. 1, and FIG. 3 is a cross sectional view taken along the line B-B of FIG.

1 to 3, the heat exchanger 120 protects the heat generating unit 120 to convert electrical energy into thermal energy, and protects the heat generating unit 120 from water stored and circulated in the storage tank 110. The pipe part 136 is provided.

First, the heating unit 122 is a horizontal base plate 124 for closing the open lower end of the storage tank 110, the support tube 128 fixed to the base plate 124, and the support tube 128 The heating coil 132 is wound around the radial outer side. Preferably, the pedestal 126 is integrally mounted to the base plate 124.

The support tube 128 has a conventional tubular shape and extends vertically from the top of the base plate 124 to the top inner surface of the storage tank 110. The radially outer side of the support tube 128 is provided with a bobbin 130 made of a conventional ceramic material. Preferably, the support tube 128 is made of stainless steel (THK 2 mm).

The heating coil 132 is wound around the bobbin 130 provided on the radially outer side of the support tube 128. Both terminals 134 of the heating coil 132 are disposed under the base plate 124 and electrically connected to a controller (not shown) for controlling the electric boiler 100 according to the present invention to form a closed circuit. . At this time, the bobbin 130 allows the heating coil 132 to be easily fixed.

On the other hand, the protection tube 136 is a heat transfer tube 138 surrounding the heat generating portion 122, and the cover tube 154 to close the upper end of the heat transfer tube 138 and to limit the heat generating portion 122 to the heat transfer tube 138 inside. Equipped.

The heat exchanger tube 138 has a normal tube shape. The lower end of the heat transfer tube 138 is spaced apart from the upper end of the base plate 124, and the upper end of the heat transfer tube 138 extends upward through the upper end of the support tube body 128. On the lower and upper inner circumferential surfaces of the heat transfer tubes 138, a bottom plate 140 and a ceiling plate 142 having an annular shape extending horizontally toward the center side of the heat transfer tube 138 are integrally formed with the heat transfer tube 138, and the bottom plate On the inner circumferential surface of the 140 is provided a lower support pipe 144 extending to the upper end of the base plate 124, and on the inner circumferential surface of the ceiling plate 142, the upper support pipe 146 extending downward beyond the upper end of the support pipe body 128 ) Is integrally formed. Preferably, the inner circumferential surfaces of the lower support tube 144 and the upper support tube 146 extend so as not to interfere with the heating coil 132.

Meanwhile, at least one circulation pipe 148 is vertically disposed between the heat transfer pipe 138, the lower support pipe 144, and the upper support pipe 146, and the bottom and top of the circulation pipe 148 are the bottom plate 140. And through the ceiling plate 142. And the circulation pipe 148 is horizontally extended to the central side of the heat transfer pipe 138 on the inner circumferential surface of the heat transfer pipe 138 is supported by a plurality of support brackets 150 having an annular shape, any one support bracket 150 The inner circumferential surface of the close contact with the outer circumferential surface of the upper support pipe (146). In this case, a first ceramic material is formed between the outer circumferential surface of the upper support tube 146, the inner circumferential surface of the heat transfer tube 138, and the support bracket 150 closely contacted to the outer circumferential surface of the top plate 142 and the upper support tube 146. The heat transfer layer 152 is provided.

On the other hand, the cover tube 154 has a conventional tubular shape and the top has a closed shape. The outer circumferential surface adjacent to the lower end of the cover tube 154 is inserted and fixedly mounted on the upper inner circumferential surface of the upper support tube 146.

That is, the cover tube 154 fixedly mounted to the heat transfer tube 138 and the heat transfer tube 138 protects the heat generating unit 122 from water stored and circulated in the storage tank 110. On the other hand, on the inner circumferential surface of the cover tube 154, the second heat transfer layer 156 made of ordinary ceramic powder is fixed so as not to interfere with the heat generating portion 122.

The following briefly describes the operating state of the low power electric boiler 100 having the improved heat exchanger formed as described above.

When water is supplied to the storage tank 110 through the water supply pipe 112 and stored and circulated, power is applied to the heating coil 132 of the heat generating unit 122. When power is applied to the heating coil 132, the heating coil 132 generates heat, and the heat transfer pipe 138 is heated by radiant heat of the heating coil 132, and as a result, is stored and circulated in the storage tank 110. Water is heated in contact with the heat pipe 138.

At this time, the first heat transfer layer 152 and the second heat transfer layer 156 is heated by the radiant heat of the heating coil 132 as well to increase the thermal efficiency of the heat exchanger 120, the circulation pipe 148 is a heat exchanger 120 ) And the water passing through the circulation pipe 148 intensively by increasing the surface area of the water stored and circulated in the storage tank 110.

The following is a test run by applying the electric boiler 100 according to the present invention to a boiler for heating and cooling purposes.

Measurement content Measures Width X length X height (cm) 38 × 38 × 100 Volume About 4.5 mW / h Initial heating water tap temperature (when the circulation pump is operated) 80 ℃ Heating water tap temperature at the start of operation (circulation pump operation time) 89 ℃ Initial heating water tapping temperature attainment time (based on initial water temperature 17 ℃) 35-38 minutes Daily power consumption (㎾ / day) (10 hours) About 45㎾ / day Heating output (㎉ / h) 3577.5 ㎉ / h Daily heating calories (10 hours) 35,775㎉ / day Daily heating water circulation 2,646ℓ / day Sole efficiency of the production boiler 87.5%

Table 1. Measurement results of the operational performance and efficiency of the prototype

When comparing the fuel consumption with other boilers under the conditions as shown in Table 1. The electric boiler 100 according to the present invention is about 20% compared to the city gas boiler, about 35% compared to the late-night electric boiler, about 67% compared to the kerosene boiler Has reduced the royalty fee (see Table 2.)

Table 2. Fees by Boiler Type

On the other hand, if the heat exchanger 120 is applied to the air conditioning system will be able to solve the operation noise or air pollution problems of the air conditioning system.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims. You will understand.

1 is a partial cross-sectional perspective view of a low power electric boiler having an improved heat exchanger according to the present invention;

2 is a cross-sectional view taken along line A-A of FIG. 1, and

3 is a cross-sectional view taken along line B-B of FIG. 1.

Explanation of symbols on the main parts of the drawing

100: low power electric boiler with improved heat exchanger

110: storage tank 120: heat exchanger

122: heat generating portion 128: support tube

132: heating coil 136: protective tube

138: heat transfer pipe 148: circulation pipe

154: cover tube

Claims (8)

An electric boiler having a storage tank and a heat exchanger disposed in the storage tank and heating the water by indirect contact with the water stored and circulated in the storage tank, The heat exchanger; A base plate, a support tube body having a general tubular shape and extending vertically from an upper end of the base plate onto an upper inner surface of the storage tank, and wound around a radially outer side of the support tube, and both terminals of the base plate; A heating unit having a heating coil disposed below; And A bottom plate and a ceiling plate having a conventional tubular shape, the lower end of which is spaced apart from the upper end of the base plate, and the upper end extends upwardly through the upper end of the support tube body, and has an annular shape extending horizontally toward the center side on the lower and upper inner circumferential surfaces. Is formed integrally, the lower support tube is provided on the inner circumferential surface of the bottom plate extending to the upper end of the base play, the heat transfer tube is formed on the inner circumferential surface of the ceiling plate extending above the upper end of the support tube body to the lower side; Low power with improved heat exchanger, characterized in that it has a conventional tubular shape and the upper end has a closed shape and the outer circumferential surface adjacent to the lower end is made of a protective tube which is inserted and fixed onto the inner circumferential surface of the upper support tube. Electric boiler. According to claim 1, wherein the radial outer side of the support tube is provided with a bobbin made of a conventional ceramic material so that the heating coil can be easily fixed, the bobbin is an improved heat exchanger characterized in that the heating coil is wound Branches are low power electric boilers. The method of claim 1, wherein the base plate is integrally mounted with a pedestal, and the terminal disposed below the base plate is electrically connected to a controller for controlling the electric boiler to improve the closed circuit characterized in that Low power electric boiler with heat exchanger. The method of claim 1, wherein at least one circulation pipe is vertically disposed between the heat transfer pipe, the lower support pipe, and the upper support pipe, and the circulation pipe is mounted through the bottom plate and the ceiling plate. Low power electric boiler with improved heat exchanger. According to claim 4, The circulation tube is supported by a plurality of support brackets extending horizontally toward the central side of the heat transfer tube on the inner circumferential surface of the heat transfer tube and having an annular shape, the inner circumferential surface of any one of the support bracket is the upper support The first heat transfer layer made of ordinary ceramic powder is provided between the outer circumferential surface of the tube, the outer circumferential surface of the upper support tube, the inner circumferential surface of the heat transfer tube, and the support bracket adhered to the outer circumferential surface of the ceiling plate and the upper support tube. A low power electric boiler having an improved heat exchanger. The low-power electric boiler according to claim 1, wherein on the inner circumferential surface of the cover tube, a second heat transfer layer made of ordinary ceramic powder is fixed so as not to interfere with the heat generating portion. According to claim 1, wherein the storage tank is hollow inside and the bottom has an open shape, the water supply pipe is mounted on one side adjacent to the bottom, the discharge pipe is mounted on the upper end, the open bottom of the storage tank is the base plate Low power electric boiler having an improved heat exchanger, characterized in that it is closed by. 8. The improved heat exchanger of claim 7, wherein a case surrounding the storage tank is provided outside the storage tank so as not to interfere with an open lower end, and an insulating material is filled between the case and the storage tank. Low power electric boiler.

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