KR101049964B1 - Electric boiler - Google Patents

Abstract

The present invention relates to an electric boiler, and more particularly, to form a wall of the low-temperature tank for storing the water heated by electricity in a double structure has excellent heat insulation effect and can be used by connecting a plurality of boilers according to the capacity. The electric boiler is simplified so that the configuration is simplified.

The present invention provides a storage tank with a water supply port and a water outlet formed therein, an insulation cover for enclosing the storage tank outside to block heat exchange, a heater unit installed inside the storage tank to heat water introduced into the storage tank, and for controlling the heater unit. The storage tank is formed of a double-walled structure consisting of an inner wall and an outer wall surrounding the inner wall from the outside and spaced apart from the inner wall by a predetermined distance to form an empty space between the inner wall and the inner wall.

According to the present invention, the wall of the low-bath tank is formed in a double structure consisting of an inner wall and an outer wall of a synthetic resin material, and has an excellent thermal insulation effect by forming an empty space having an insulation effect between the inner wall and the outer wall.

Boiler, Electricity, Heat Insulation, PCM, Double Wall, Synthetic Resin

Description

Electric boiler

The present invention relates to an electric boiler, and more particularly, to form a wall of the low-temperature tank for storing the water heated by electricity in a double structure has excellent heat insulation effect and can be used by connecting a plurality of boilers according to the capacity. The electric boiler is simplified so that the configuration is simplified.

In general, an electric boiler heats hot water by heating cold water introduced through a water supply pipe through an electric heater, and is divided into a hot water boiler and a hot water boiler according to a method of heating hot water.

The low boiling type electric boiler heats low temperature water stored in a large storage tank through a water supply pipe to a high temperature through an electric heater installed in the water storage tank and discharges it to the drain pipe. At this time, the water stored in the water storage tank is gradually heated by the electric heater, and is heated as a whole while circulating the inside of the water storage tank by the temperature difference. In other words, the water stored in the reservoir tank is heated as a whole over time.

However, the low temperature type electric boiler has a large water storage tank so that the user can use abundant heating water, but the electric heater installed in the large capacity water storage tank is not sufficient to convert the water filled in the water storage tank into hot water in a short time. Since the low boiling water boiler does not heat the entire portion of the water storage tank, it takes a lot of time to heat the water stored in the water storage tank and is limited to the installation place due to the size of the water storage tank, so it is mainly installed outside. Because of the relatively narrow interior, such as a one-room, where a lot of living space was provided, it was difficult to install a water-type electric boiler in each room.

And the hot water type electric boiler is a cold water introduced into a relatively small direct water pipe is heated to a high temperature through a large heat transfer heater by a pump and discharged to the drain pipe. These hot water boilers are instantaneously heated by large electric heaters to convert cold water into hot water, and since they do not use a separate hot water tank, they can be used as a wall-mounted type because they can be used as a wall-mounted type. It is used a lot for a dragon.

However, in the case of indoor heating using such a hot water type electric boiler, the consumption of electricity due to the use of a large-capacity electric heater is greatly increased, and when the boiler is stopped, the hot water in the heating tube is rapidly cooled. Therefore, even if you go out for a few hours to come back, the boiler must be continuously operated to maintain the heating, so there is a problem that the economic burden is increased, such as excessive heating costs.

The present invention has been made to solve the above problems, to compensate for the shortcomings of the hot water boiler, to provide an electric boiler with excellent thermal insulation effect to prevent the high temperature water stored in the low-temperature tank is rapidly cooled when the boiler is stopped. Its purpose is to.

Another object of the present invention is to provide an electric boiler that can be easily installed in existing heating or hot water pipes by simplifying the configuration, and can be freely connected to a plurality of boilers according to the use capacity of hot water and heating water.

The electric boiler of the present invention for achieving the above object is a water tank and a water outlet formed with a water outlet; An insulation cover surrounding the storage tank from outside to block heat exchange; A heater unit installed inside the storage tank to heat water introduced into the storage tank; And a controller for controlling the heater unit, wherein the storage tank comprises an inner wall and an outer wall including an inner wall surrounding the inner wall from an outer side and spaced apart from the inner wall by a predetermined distance to form an empty space between the inner wall and the inner wall. Characterized in that formed.

Between the inner wall and the outer wall of the water tank is characterized in that the heat storage unit is filled with a heat storage material (phase change material) for storing the heat energy by the phase change.

The water supply port and the water outlet of the water storage tank are provided with a first circulation pipe and a second circulation pipe connected to a heating pipe or a hot water tank, and are connected to the second circulation pipe to move water according to expansion and contraction of the water stored in the water storage tank. A connection pipe, an expansion tank connected to the connection pipe, a water supply pipe connected to an upper portion of the expansion tank so that water is introduced into the expansion tank, and a valve installed at the water supply pipe according to the level of the inside of the expansion tank. It is characterized by including a float.

The heater unit has a hollow housing, a cylindrical bobbin made of magnesium oxide, which is installed at an inner center of the housing, a heating wire spirally wound around the bobbin, and connected to the heating wire to the outside of the housing. It is characterized in that it comprises a lead wire made of extending nickel material.

As described above, according to the present invention, the wall of the water tank is formed of a double structure including an inner wall and an outer wall of a synthetic resin material, and an excellent thermal insulation effect is formed by forming an empty space having an insulation effect between the inner wall and the outer wall.

In particular, when the heat storage material is formed by filling the heat storage material in the wall of the water storage tank, even if the heater unit is not operated, the water is maintained at a high temperature by the heat emitted from the heat storage portion for a predetermined time, and is provided by an insulation cover installed outside the water storage tank. By preventing the cooling below a certain temperature it is possible to prevent the water from cooling for a long time compared to the conventional boiler.

And the boiler of the present invention is very simple in configuration can be easily installed in the existing heating or hot water pipe, and can be installed by connecting a plurality of boilers freely according to the use capacity of hot water and heating water.

Hereinafter, an electric boiler according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

1 is a partial cutaway perspective view showing an electric boiler according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing the interior of the electric boiler of Figure 1, Figure 3 is a part showing a heater unit applied to the electric boiler of Figure 1 Incision perspective view.

1 to 3, the electric boiler according to an embodiment of the present invention is largely provided with a storage tank 10, a heat insulation cover 50, a heater unit 60, and a controller (not shown). .

The storage tank 10 has a storage space 15 is formed so that a certain amount of water is stored therein, one side is open and the other side has a closed cylindrical shape. Cap 30 is coupled to the open side so as to seal the storage space 15. Unlike this, the storage tank 10 may be formed in a sealed form on both sides.

The closed side of the water storage tank 10 is formed with a water supply port 27 for introducing water and a water outlet 29 for discharging the water. The water supply port 27 and the water outlet 29 are connected to the water supply pipe 41 and the water discharge pipe 45, respectively, and are arranged side by side.

In the present invention, the storage tank 10 has a double wall structure to prevent the water heated in the storage space 15 from being cooled down quickly. Specifically, the water storage tank 10 includes an inner wall 21 and an outer wall 23 formed to surround the inner wall 21 from the outside and spaced apart from the inner wall 21 by a predetermined distance.

The inner wall 21 and the outer wall 23 are arranged concentrically about the storage space 15. Therefore, an empty space 20 is formed between the inner wall 21 and the outer wall 23. The outer wall 23 and the inner wall 21 are interconnected by reinforcing ribs 25 across the space 20. The reinforcing rib 25 is continuously formed from one side to the other side along the left and right longitudinal directions of the water storage tank 10. The reinforcement ribs 25 are provided with many.

The double wall structure may be formed by coupling the reinforcing ribs 25 to the outer circumferential surface of the inner wall 21 and then arranging the outer wall 23, and then combining the outer wall 23 and the ribs 25, without being limited thereto. Any structure is possible as long as the inner wall 21 and the outer wall 23 can be spaced apart at regular intervals to form a wall of a double structure.

Preferably, the empty space 20 between the inner wall 21 and the outer wall 23 may be formed as a vacuum layer. This vacuum layer prevents the heat exchange, thereby effectively preventing the water from cooling. To this end, the pipe is coupled to a discharge hole (not shown) formed in the outer wall 23, and the pipe is connected to a vacuum device for sucking and discharging air to discharge the air between the inner wall and the outer wall to make a vacuum state and then discharge the discharge hole. Close it.

The low temperature bath 10 is preferably formed using a synthetic resin that is lighter than the metal material and has a low thermal conductivity. The well-known double injection method can be used to form the water storage tank 10 which has a wall of a dual structure. In the case of using a synthetic resin, a material having sufficient structural strength and strong heat resistance and corrosion resistance is used to replace an existing metal due to the characteristics of the electric boiler. In the case of using general synthetic resin among synthetic resins, glass fibers may be mixed to improve strength. For example, it may be a glass fiber reinforced resin in which glass fibers are mixed in an ABS resin.

Preferably, synthetic plastic is used as the synthetic resin. Engineering plastics are high-performance resins of polymer structure that have improved strength significantly compared to general-purpose plastics so that they can be used as industrial materials or structural materials.As a general rule, engineering plastics have heat resistance of 100 ° C or higher, strength of 49.0 MPa or higher, and flexural modulus of 2.4. The resin having a degree of Gpa is referred to.

In particular, the engineering plastic is preferably any one of the crystalline polymer resin selected from polyamide (PA; Polyamide), polyethylene terephthalate (PET), polybutylene terephthalate (PBT).

Polyamide is not only excellent in mechanical performance, but also excellent in heat resistance, and has a large reinforcing effect by glass fibers, which is advantageous for making a high rigid low temperature bath. Polyethylene terephthalate (PET) is a crystalline thermoplastic resin, and has excellent heat resistance, chemical resistance, electrical properties, and weather resistance, and is used in the electric / electronic field, automobile, and vehicle field. In particular, GF-PET reinforced with polyethylene terephthalate glass fiber has lower cost, lower processing cost, and higher strength per weight than aluminum die-cast. Various shapes are possible without corrosion. Glass fibers are preferably incorporated in a weight ratio of about 15 to 50% with respect to the resin.

As described above, the present invention can maintain the warmth for a long time because the low temperature bath 10 is injection-molded with a synthetic resin because the thermal conductivity is lower than that of the conventional boiler made of metal. In particular, since the wall of the water storage tank 10 is formed in a double structure having an empty space therein, since heat is not discharged to the outside by heat conduction between the inner wall and the outer wall, it is possible to slow down the thermal cooling rate so that the heat insulating effect is excellent.

Meanwhile, as shown in FIG. 4, the storage tank 10 according to another embodiment of the present invention includes a heat storage unit 55 filled with a phase change material between the inner wall 21 and the outer wall 23. Is formed.

The heat storage material is heated to a temperature higher than room temperature to accumulate heat in the material itself, and then releases heat to the water stored in the storage tank 10 to maintain the water at a constant temperature for a predetermined time. It is preferable to use a phase change material (PCM, hereinafter referred to as PCM) that stores thermal energy by phase change as the heat storage material.

PCM absorbs or releases latent heat in an isothermal state upon phase change between the solid and liquid states. Because of this phase change, the PC that stores the thermal energy absorbs or releases latent heat, and thus can store a larger amount of thermal energy than a general heat storage material. The PCM absorbs and stores heat when it rises above the phase change temperature, that is, the melting point, and releases the stored heat when the temperature falls below the melting point to maintain a constant temperature.

Preferably a PCM having a phase change temperature at about 60 ° C. or higher is used. For example, when the PCM having a phase change temperature at 80 ° C. is charged in the heat storage unit 55, when the water heated to 100 ° C. by the electric heater unit is stored in the storage tank 5, the PC is in the initial solid state. Phase absorbs heat from the water and phases into a liquid state. In addition, when the heater unit does not operate and the water cools down slowly and the temperature drops to about 80 ℃, the heat is released to prevent the water from falling below 80 ℃. Therefore, even if the boiler does not operate, the water can be kept warm for a long time.

Conventional PCMs known in the present invention can be used, and paraffin-based materials are used as an example. More specifically, hexadecane and octadecane may be used, and various types of paraffinic materials may be mixed and used.

The heater unit 60 for heating the water stored in the inside of the water storage tank 10 heats the water within a short time. The heater unit 60 is supported by the inner wall 21 so as to cross the storage space 15 of the water storage tank 10, and a plurality of heater units 60 are installed to meet the capacity.

The heater unit 60 applied to the present invention has a housing 61 having a hollow inside, a cylindrical bobbin 63 made of magnesium oxide, which is installed at the inner center of the housing 61, and a spiral around the bobbin 63. The heating wire 65 wound with the wire, and the lead wire 69 made of nickel material connected to the heating wire 65 and extending to the outside of the housing 61. One open side of the housing 61 is sealed by sealing with Teflon, silicone rubber or epoxy. The heating wire 65 is made of a nickel-chromium alloy, and is coiled by the bobbin 67 to increase the amount of heat generated by the high power density, and extend the life of the heating wire 65. In addition, the heating wire 65 and the housing 61 may be filled with magnesium oxide to increase the insulation effect and increase heat transfer. In addition, the lead wire 69 made of nickel material is easy to install.

The outer side of the storage tank 10 is formed with a heat insulating cover 50 to block the heat exchange. The insulation cover 50 is a structure in which a heat insulating material is formed in a tubular shape and is covered on the outside of the water storage tank 10. As the heat insulating material, polyurethane, artron, polyester, polyethylene, synthrate, propylene, or the like may be used. Such a heat insulation cover can further improve the heat insulation efficiency of the storage tank.

And a well-known controller for controlling the heater unit 60 is installed. The controller may be installed on the outer surface of the water storage tank 10, or as shown in FIG. 5 or 6, the controller 90 may be separately installed in a spaced structure of the water storage tank 10. In addition, a known water temperature sensor may be installed inside the storage tank 10.

5 and 6 is a schematic view showing a state in which the electric boiler according to another embodiment of the present invention is used for hot water and heating.

First, referring to FIG. 6, the electric boiler of the present invention has a structure in which two storage tanks 10 are connected side by side. That is, since water is heated at the same time in the storage tank installed in the upper portion and the storage tank installed in the lower portion can increase the capacity twice.

The water outlet pipe 41 and the water supply pipe 45 of each storage tank 10 are provided with a first circulation pipe 81 and a second circulation pipe 83 connected to the heating pipe 80. The water stored in the water storage tank 10 is heated by the heater unit, and the heated water passes through the water outlet pipe 41 and the first circulation pipe 81 of the water storage tank 10 to the heating pipe 80 installed indoors. It will cycle. Water deprived of heat while passing through the heating pipe 80 is introduced into the inside of the water storage tank 10 again through the second circulation pipe 83 and the water supply pipe 45. The water outlet pipe 41 and the water supply pipe 45 may be provided with a valve for opening and closing each flow path. The water supply pipe 45 is provided with a pump 85 for circulating water.

In the present invention, it is preferable that expansion control means is provided in order to counteract that the water filled in the inside of the water storage tank 20 is expanded by heating. A connecting pipe 91 connected to the first circulation pipe 81 as an expansion control means, an expansion tank 93 installed at an upper portion of the connection pipe 91, and an expansion tank so that water flows into the expansion tank 93. The supplementary water supply pipe 95 connected to the upper portion of the 93, and the float 97 for operating a valve (not shown) installed at the end of the supplemental water supply pipe 95 in accordance with the water level inside the expansion tank (93).

Therefore, when the water filled in the inside of the water storage tank 10 is heated or boiled, the volume is expanded while expanding. In this case, a part of the water filled in the storage tank 10 flows into the expansion tank 93 through the connection pipe 91. Expansion tank 93 has a space that can accommodate the expanded water during expansion so that the water level is maintained only up to a certain height in normal. When the water is cooled and contracted or lacks of water, the water is replenished in the expansion tank 93 through the connection pipe 91. In this case, when the water level of the expansion tank 93 is lowered, the float 97 descends and the valve provided at the end of the supplemental water supply pipe 95 opens the flow path of the supplemental water supply pipe 95 so that water is replenished. When the water rises to a certain level, the float 97 floats and the valve closes the supplemental water supply pipe 95 so that the water supply is stopped.

Unlike shown, the connecting pipe can be installed to be directly connected to the reservoir. And as shown, in addition to the two storage tanks, one storage tank or three or more storage tanks may be connected to be installed.

5 shows a state of the water storage tank 10 connected to the hot water tank 70. Water introduced into the water storage tank 10 from the hot water tank 70 is heated in the water storage tank 10, and the water heated in the water storage tank 10 is stored in the hot water tank 70. The water stored in the hot water tank 70 allows the user to use hot water through the hot water discharge tube 71. And the hot water tank 70 is installed so that the supply pipe 73 for supplying water to be filled with water when hot water consumption.

Meanwhile, components not described above in the exemplary embodiment illustrated in FIG. 5 are the same as the exemplary embodiment illustrated in FIG. 6, and thus detailed descriptions thereof will be omitted.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, which is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. .

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is a partial cutaway perspective view showing an electric boiler according to an embodiment of the present invention,

2 is a cross-sectional view showing the interior of the electric boiler of FIG.

3 is a partially cutaway perspective view illustrating a heater unit applied to the electric boiler of FIG. 1;

Figure 4 is a cross-sectional view showing the interior of the electric boiler according to another embodiment of the present invention,

5 and 6 is a schematic view showing a state in which the electric boiler according to another embodiment of the present invention is used for hot water and heating.

<Description of the symbols for the main parts of the drawings>

10: reservoir 21: inner wall

23: outer wall 25: reinforcing rib

41: outlet pipe 45: water supply pipe

55: heat storage unit 60: heater unit

Claims (4)

A storage space is formed so that water can be stored therein, one side of which is open and the other side of which is made of a sealed cylinder, and a water storage tank and a water outlet which are formed on the other side of the airtight; A cap coupled to one open side of the water storage tank to seal the storage space; An insulation cover surrounding the storage tank from outside to block heat exchange; A heater unit installed inside the storage tank to heat water introduced into the storage tank; A controller for controlling the heater unit; The storage tank has an inner wall, an outer wall surrounding the inner wall from the outside and spaced apart from the inner wall to form an empty space between the inner wall and the inner wall, and is installed between the inner wall and the outer wall and continuously from one side to the other side of the storage tank. Is formed of a wall of a double structure consisting of a reinforcing rib to traverse the empty space left and right, Between the inner wall and the outer wall of the water storage tank is provided with a heat storage unit filled with a heat storage material, The heat storage material is a phase change material that releases latent heat by phase change at a temperature to be kept warm, The heater unit has a hollow housing, a cylindrical bobbin made of magnesium oxide, which is installed at an inner center of the housing, a heating wire spirally wound around the bobbin, and connected to the heating wire to the outside of the housing. It is provided with an extension nickel lead wire, The first and second circulation pipes connected to the heating pipe or the hot water tank are connected to the outlet and the water supply port of the water storage tank, respectively. A connection pipe connected to the first circulation pipe to move water according to expansion and contraction of water stored in the storage tank, an expansion tank connected to the connection pipe, and an upper portion of the expansion tank so that water flows into the expansion tank; And a supplementary water supply pipe connected to the air supply unit, and a fitting for opening and closing a valve installed in the supplementary water supply pipe according to the level of the inside of the expansion tank. delete delete delete

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