CN220937687U - Liquid heater - Google Patents

Abstract

The utility model relates to the field of small household appliances, in particular to a liquid heater. The kettle comprises a kettle body with an inner container, wherein a heating component is arranged on a chassis of the inner container and comprises a first heating element, a second heating element and a heat conducting plate, the heat conducting plate is provided with a first heat conducting area and a second heat conducting area, the first heat conducting area is positioned at the outer side of the second heat conducting area in a horizontal space, the heat conducting coefficient of the heat conducting plate in the first heat conducting area is larger than that of the heat conducting plate in the second heat conducting area, the first heating element is arranged in the first heat conducting area, the second heating element is arranged in the second heat conducting area, the power of the first heating element is smaller than that of the second heating element, and the sum of the power of the first heating element and the power of the second heating element is larger than 1800W and smaller than 2200W. According to the utility model, on the basis of increasing the number of heating pieces and improving the heating efficiency, the chassis of the liner is uniformly heated, so that the water heating noise is reduced, and the user experience is improved.

Description

Liquid heater

Technical Field

The utility model relates to the field of small household appliances, in particular to a liquid heater.

Background

Liquid heaters such as electric water bottles, electric kettles and the like are commonly used for boiling water and tea, and a heating component is generally arranged at the bottom of the inner container. In order to increase the heating speed, the heating component usually uses higher power, and some liquid heaters with conventional capacity of 5L usually have power of 1000W or even more than 1500W, such as Chinese patent grant publication No. CN205697212U, named as a high-power electric kettle; in Chinese patent grant publication No. CN201481071U, the patent named "mineralized electric kettle" and the like, the heating efficiency is increased by improving the power of the heating element, but the heating element has uneven heating and local overheating, so that the heating noise is overlarge and the use experience of a user is influenced.

Some heating assemblies increase power by increasing the number of heating elements, such as double heating pipes nested inside and outside, but the contact heat transfer area of the heating pipe and the aluminum plate is limited, and the heat transfer of the aluminum plate part which is not contacted with the heating pipe needs time, although the heat transfer is improved, the problem of local overheating still exists, so that the water heating noise is too large to influence the use experience of users.

Disclosure of utility model

Aiming at the defects that the existing liquid heater adopts a plurality of heating parts, but still has local overheating, so that the water heating noise is improved and the user experience is affected, the utility model aims to provide the liquid heater which can uniformly heat the chassis of the liner on the basis of increasing the number of heating parts and improving the heating efficiency, reduce the water heating noise and improve the user experience.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a liquid heater, includes the kettle body that has the inner bag, is equipped with heating element on the chassis of inner bag, heating element includes first heating element, second heating element, heat conduction board, the heat conduction board has first heat conduction area, the second heat conduction area, first heat conduction area is located the outside of second heat conduction area in horizontal space, the heat conduction coefficient of heat conduction board in first heat conduction area is greater than the heat conduction coefficient of heat conduction board in the second heat conduction area, first heating element sets up in first heat conduction area, the second heating element sets up in the second heat conduction area, the power of first heating element is less than the power of second heating element, the sum of the power of first heating element and the power of second heating element is greater than 1800W and is less than 2200W.

In this technical scheme, heating element adopts two heating element structures, has set up two heating elements of first heating element, second heating element on the heat-conducting plate, and the power sum of first heating element and second heating element is greater than 1800W and is less than 2200W to improve heating element's total power, guarantee the efficiency of heating water, under the same circumstances, the noise that the low heating element of power heated water is littleer, and the low-power first heating element is selected for use in the two heating element structure outsides, under the unchangeable circumstances of total power, the inboard then selects the second heating element of high-power. While the thermally conductive plate has two sections: an outer first heat transfer area and an inner second heat transfer area. The first heating element is arranged on the first heat conduction area, the second heating element is arranged on the second heat conduction area, the first heating element on the outer side is low in power, the first heat conduction area is high in heat conduction coefficient, the second heating element on the inner side is high in power, the second heat conduction area is low in heat conduction coefficient, after integration, heat of a unit area of the inner container chassis conducted by the heating assembly is more uniform, collision movement of transverse conduction in water molecule heat conduction is reduced, rapid vibration during heat release is slowed down, generation of bubbles is reduced, noise is reduced, and the purpose of reducing noise while improving power is achieved.

The utility model is further arranged to: the heat conducting plate comprises a first heat conducting plate, a second heat conducting plate and a third heat conducting plate, wherein the first heat conducting plate is arranged at the lower end of a chassis of the inner container, the first heat conducting plate, the second heat conducting plate and the third heat conducting plate are sequentially stacked from top to bottom in the second heat conducting area to form a composite plate, the projection of the composite plate on the horizontal plane is positioned in the projection of the first heat conducting plate on the horizontal plane, the first heating element is arranged at the lower end of the first heat conducting plate and is positioned outside the composite plate, the second heating element is arranged at the lower end of the composite plate, and the heat conductivity of the first heat conducting plate and the heat conductivity of the third heat conducting plate are the same and larger than the heat conductivity of the second heat conducting plate. Through this setting, the second heat conduction district of inboard arranges and is three-layer composite sheet, and wherein the top plate is first heat conduction board, and the bottom plate is the third heat conduction board, presss from both sides the second heat conduction board in the middle of first heat conduction board and the third heat conduction board, and first heat conduction board pastes to be established on the chassis of inner bag, and the second heat conduction spare sets up on the third heat conduction board, and the first heat conduction district of outside arranges and is first heat conduction board, also is the outside part that extends of top plate of composite sheet, and first heat conduction spare sets up on the extension of first heat conduction board. The first heat conducting plate and the third heat conducting plate are made of the same material, the second heat conducting plate is made of another material with lower heat conductivity coefficient, the overall heat conductivity coefficient of the composite plate is lower than that of the first heat conducting plate, heat accumulation of the position, above the second heating piece, corresponding to the composite plate is delayed, and the upper layer plate of the composite plate is the first heat conducting plate with good heat conductivity, and meanwhile heat is conducted to the center of the liner chassis, so that the liner chassis is heated uniformly.

The utility model is further arranged to: the heat conducting plate comprises a first heat conducting plate and a second heat conducting plate, the first heat conducting plate is arranged at the lower end of the chassis of the liner, the second heat conducting plate is embedded into the first heat conducting plate to form a composite plate, the first heating piece is arranged at the lower end of the first heat conducting plate and is located outside the second heat conducting plate, the second heating piece is arranged at the lower end of the first heat conducting plate and is located below the second heat conducting plate, and the heat conductivity coefficient of the first heat conducting plate is larger than that of the second heat conducting plate. Through this setting, the inboard second heat conduction district arrangement is the composite sheet, and the composite sheet is by the double-deck board that first heat conduction board and second heat conduction board are compound, and the coefficient of heat conduction of second heat conduction board is less than the heat conduction base number of first heat conduction board, and the second heat conduction board is embedded in first heat conduction board, and the second heating member setting is at the lower extreme of composite sheet, and the first heat conduction district arrangement in outside is first heat conduction board, also is the outside extension of outer layer board of composite sheet part, and first heat conduction member setting is on the extension of first heat conduction board. The integral heat conductivity coefficient of the composite board is lower than that of the first heat conducting board, the composite board delays heat accumulation of the second heating piece corresponding to the position above the composite board, and the outer layer board of the composite board is the first heat conducting board with good heat conductivity and conducts heat to the center of the liner chassis, so that the liner chassis is heated uniformly.

The utility model is further arranged to: the heat conduction coefficient of the heat conduction plate of the first heat conduction area is K1, the heat conduction coefficient of the heat conduction plate of the second heat conduction area is K2, the surface heat load of the first heating element is P1, the surface heat load of the second heating element is P2, (P1/P2) = (K2/K1). Through this setting, in the heating element working process, through the above variable of control, guarantee that the inner bag chassis heating temperature T1 of first heating element top equals as far as possible with the inner bag chassis heating temperature T3 of second heating element top to reach the purpose of making an uproar falls.

The utility model is further arranged to: the heat conduction coefficient of the heat conduction plate of the first heat conduction area is K1, the heat conduction coefficient of the heat conduction plate of the second heat conduction area is K2, the surface heat load of the first heating element is P1, and the surface heat load of the second heating element is P2,1.2 (K2/K1) > (P1/P2) > (K2/K1). Through this setting, the thermal conductivity of composite sheet and board thickness, material and welded fastening mode etc. are relevant, take into account the heat conduction space that exists in fact between the composite sheet, take into account actual production simultaneously, the power of each heating element and the board thickness of each plywood should be as far as possible rounded, and the theoretical value of convenient processing production, K2 is greater than actual value. Thus P1/P2 is slightly greater than K2/K1.

The utility model is further arranged to: the first heat conducting plate, the second heat conducting plate and the third heat conducting plate are completely overlapped in the second heat conducting area. Through this setting, first heat-conducting plate, second heat-conducting plate, third heat-conducting plate are the same in second heat conduction district shape, can ensure that the composite sheet heat conduction is even, and whole more pleasing to the eye.

The utility model is further arranged to: the first heat conducting plate and the third heat conducting plate are made of aluminum material components, and the second heat conducting plate is made of iron or steel material components. The first heat-conducting plate and the third heat-conducting plate are made of aluminum, the heat conductivity coefficient of the aluminum is 237W/Mk, the heat conduction efficiency is high, the heat of the heating element can be conveniently diffused into the inner container chassis, the material of the second heat-conducting plate can be iron or stainless steel, the heat conductivity coefficient of the stainless steel is 17W/Mk, and the heat conductivity coefficient of the iron is 80W/Mk, so that the overall heat conductivity coefficient of the composite board is reduced.

The utility model is further arranged to: the first heat conducting plate, the second heat conducting plate and the third heat conducting plate are all in concentric annular arrangement, the outer diameter of the first heat conducting plate is larger than that of the third heat conducting plate, the first heating element is arranged at the lower end of the first heat conducting plate in a surrounding mode and is located at the outer side of the second heat conducting plate, and the second heating element is arranged at the lower end of the third heat conducting plate in a surrounding mode and is located below the second heat conducting plate. Through this setting, first heating piece, second heating piece are the tubulose, and first heating piece is arranged on first heat conduction board and is located outside the third heat conduction board, and first heat conduction area is annular promptly, and tubular first heat conduction piece carries out even heating to first heat conduction board, and second heat conduction piece is arranged on the third heat conduction board, and second heat conduction area is annular promptly, and tubular second heat conduction piece carries out even heating to the composite sheet.

The utility model is further arranged to: the first heat-conducting plate is made of an aluminum material member, and the second heat-conducting plate is made of an iron or steel material member. The first heat-conducting plate is aluminum, the heat conductivity coefficient of the aluminum is 237W/Mk, the heat conduction efficiency is high, the heat of the heating element can be conveniently diffused to the inner container chassis, the material of the second heat-conducting plate can be iron or stainless steel, the heat conductivity coefficient of the stainless steel is 17W/Mk, and the heat conductivity coefficient of the iron is 80W/Mk, so that the overall heat conductivity coefficient of the composite board is reduced.

The utility model is further arranged to: the first heat-conducting plate and the second heat-conducting plate are both in a concentric annular shape, the outer diameter of the first heat-conducting plate is larger than that of the second heat-conducting plate, the first heating element is arranged at the lower end of the first heat-conducting plate in a surrounding mode and is located at the outer side of the second heat-conducting plate, and the second heating element is arranged at the lower end of the first heat-conducting plate in a surrounding mode and is located below the second heat-conducting plate. Through this setting, first heating spare, second heating spare are the tubulose, and first heating spare is arranged on first heat-conducting plate and is located outside the second heat-conducting plate, and first heat-conducting area is annular promptly, and the first heat-conducting piece of tubulose carries out even heating to the part that first heat-conducting plate is located outside the second heat-conducting plate, and the second heat-conducting piece is arranged on first heat-conducting plate and is located second heat-conducting plate below, and second heat-conducting area is annular promptly, and tubular second heat-conducting piece carries out even heating to the composite sheet.

The utility model has the advantages that: 1) The heating component adopts a double-heating-element structure, and the heat conducting plate is provided with a first heating element and a second heating element, so that the total power of the heating component is improved, the outer side of the double-heating-element structure is selected to be a low-power first heating element, and the inner side of the double-heating-element structure is selected to be a high-power second heating element under the condition that the total power is unchanged. The first heat conduction area outside the heat conduction plate has large heat conduction coefficient, the second heat conduction area inside the heat conduction plate has small heat conduction coefficient, the heat of the unit area of the chassis of the liner conducted by the heating component is more uniform after synthesis, the collision motion of transverse conduction in the heat conduction of water molecules is reduced, the rapid vibration during heat release is slowed down, the generation of bubbles is reduced, and therefore the noise is reduced, and the aim of reducing the noise while improving the power is fulfilled. 2) The second heat conduction area is a composite board with small heat conduction coefficient formed by compositing boards with different heat conduction coefficients, the first heat conduction area is a single board with large heat conduction coefficient, and the composite board can be formed by clamping two aluminum boards with one steel board or coating the aluminum boards with the steel board.

Drawings

FIG. 1 is a schematic diagram of a prior art liquid heater employing dual heating tubes;

FIG. 2 is a schematic diagram of a liquid heater according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a schematic diagram of a heating assembly in accordance with one embodiment of the present utility model;

Fig. 5 is a schematic view showing a partial structure of a heating unit according to an embodiment of the present utility model.

Reference numerals: heating pipe 100, liner 200, first heating element 300, second heating element 301, first heat-conducting plate 400, second heat-conducting plate 401, third heat-conducting plate 402, and composite plate 403.

Detailed Description

In the description of the present embodiment, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like are presented, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

The utility model is further described below with reference to the drawings and specific examples.

The existing liquid heater comprises a kettle body, the kettle body is provided with a liner 200 for containing liquid, a heating component is arranged on the bottom disc of the liner 200, and the heating component heats the liquid in the liner 200.

Under the condition that the heating assembly in the conventional technology only comprises a single heating pipe 100 and only improves the power of the single heating pipe 100, in the working process, the heating pipe 100 converts electric energy into heat energy, heat is concentrated through an aluminum plate, so that the heat concentration of the aluminum plate near the upper part of the heating pipe 100 rises, a heat collecting area corresponding to the shape of the heating pipe 100 is easily formed on a chassis, the heat in the middle of the aluminum plate is less, a heat conducting area with less heat is formed, the heat is less in transverse transfer, and the temperature of the heat conducting area in the middle of the chassis is obviously lower than that of the heat collecting area, so that obvious heating non-uniformity is caused. The heat transfer is molecular movement, and uneven heating leads to water molecules to transfer heat up and down, and heat transfer is also performed transversely, so that relative movement of the water molecules is aggravated, and water heating noise is increased.

There are also known techniques for heating assemblies using dual heating tubes 100. Referring to fig. 1, two heating pipes 100 are nested in a double C shape and closely attached to the bottom of an aluminum plate. Under the condition of constant total power, compared with a single-tube structure, the contact area of the heating tube 100 and the aluminum plate is increased, the power of the single tube is reduced, and the heating value of the unit area is reduced. To control the heat load of the surface of the two heating pipes 100 to be the same, the heating power per unit area of the surface of the two heating pipes 100 is equal. Thus, in the case of the same cross-sectional area of the heating tube 100, the outer heating tube 100 is longer, and the power of the outer heating tube 100 should be higher than that of the inner heating tube 100. However, the contact heat transfer area between the heating tube 100 and the aluminum plate is limited, and the heat transfer of the aluminum plate not contacted with the heating tube 100 needs time, so that the problem of local overheating of the bottom disc of the liner 200 still exists.

In order to solve the problem that the existing liquid heater adopts multiple heating elements and still has local overheating, which results in increased water heating noise and affects the user's experience, in an embodiment of the present utility model, referring to fig. 2, 3, 4 and 5, the liquid heater includes a kettle body with a liner 200, a heating component is disposed on a bottom plate of the liner 200, the heating component includes a first heating element 300, a second heating element 301 and a heat conducting plate, the heat conducting plate has a first heat conducting area and a second heat conducting area, the first heat conducting area is located at an outer side of the second heat conducting area in a horizontal space, a heat conductivity coefficient of the heat conducting plate in the first heat conducting area is greater than a heat conductivity coefficient of the heat conducting plate in the second heat conducting area, the first heating element 300 is disposed in the first heat conducting area, the second heating element 301 is disposed in the second heat conducting area, and a power of the first heating element 300 is smaller than a power of the second heating element 301.

In this embodiment, the heating assembly adopts a dual-heating-element structure, two heating elements of the first heating element 300 and the second heating element 301 are arranged on the heat conducting plate, the sum of the power of the first heating element 300 and the power of the second heating element 301 is greater than 1800W and less than 2200W, so that the total power of the heating assembly is improved, the water heating efficiency is ensured, the noise of the heating element with low power for heating water is smaller under the same condition, the low-power first heating element 300 is selected at the outer side of the dual-heating-element structure, and the high-power second heating element 301 is selected at the inner side under the condition that the total power is unchanged. While the thermally conductive plate has two sections: an outer first heat transfer area and an inner second heat transfer area. The first heating element 300 is arranged on the first heat conduction area, the second heating element 301 is arranged on the second heat conduction area, the first heating element 300 on the outer side is low in power, the first heat conduction area is high in heat conduction coefficient, the second heating element 301 on the inner side is high in power, the second heat conduction area is low in heat conduction coefficient, after synthesis, heat of a unit area of the chassis of the liner 200, which is conducted by the heating assembly, is more uniform, collision movement of transverse conduction in heat conduction of water molecules is reduced, rapid vibration during heat release is reduced, generation of bubbles is reduced, noise is reduced, and the purpose of reducing noise while improving power is achieved.

In order to realize the partition of the first heat conduction area and the second heat conduction area on the heat conduction plate, referring to fig. 2 and 3, in one embodiment of the present utility model, the heat conduction plate includes a first heat conduction plate 400, a second heat conduction plate 401, and a third heat conduction plate 402, the first heat conduction plate 400 is disposed at the lower end of the chassis of the liner 200, the first heat conduction plate 400, the second heat conduction plate 401, and the third heat conduction plate 402 are stacked in sequence from top to bottom on the second heat conduction plate to form a composite plate 403, the projection of the composite plate 403 on the horizontal plane is located within the projection of the first heat conduction plate 400 on the horizontal plane, the first heating element 300 is disposed at the lower end of the first heat conduction plate 400 and is located outside the composite plate 403, the second heating element 301 is disposed at the lower end of the composite plate 403, and the heat conductivity coefficients of the first heat conduction plate 400 and the third heat conduction plate 402 are the same and greater than that of the second heat conduction plate 401. The inner second heat conducting area is arranged with three layers of composite boards 403, wherein the upper layer board is a first heat conducting board 400, the lower layer board is a third heat conducting board 402, the second heat conducting board 401 is clamped between the first heat conducting board 400 and the third heat conducting board 402, the first heat conducting board 400 is attached to the chassis of the liner 200, the second heat conducting piece is arranged on the third heat conducting board 402, the outer first heat conducting area is arranged with the first heat conducting board 400, the upper layer board of the composite board 403 extends outwards, and the first heat conducting piece is arranged on the extension part of the first heat conducting board 400. The first heat conducting plate 400 and the third heat conducting plate 402 are made of the same material, the second heat conducting plate 401 is made of another material with a lower heat conducting coefficient, the overall heat conducting coefficient of the composite plate 403 is lower than that of the first heat conducting plate 400, heat accumulation of the second heating element 301 corresponding to the position above the composite plate 403 is delayed, and heat is conducted to the center of the chassis of the liner 200 due to the fact that the upper layer plate of the composite plate 403 is the first heat conducting plate 400 with good heat conducting performance, and therefore the chassis of the liner 200 is heated uniformly.

Specifically, the first heat-conducting plate 400, the second heat-conducting plate 401 and the third heat-conducting plate 402 are all in a concentric ring shape, the outer diameter of the first heat-conducting plate 400 is larger than that of the third heat-conducting plate 402, the first heating element 300 is arranged around the lower end of the first heat-conducting plate 400 and is positioned outside the second heat-conducting plate 401, and the second heating element 301 is arranged around the lower end of the third heat-conducting plate 402 and is positioned below the second heat-conducting plate 401. The first heating element 300 and the second heating element 301 are tubular, the first heating element 300 is arranged on the first heat conducting plate 400 and is located outside the third heat conducting plate 402, namely, the first heat conducting area is annular, the tubular first heat conducting element uniformly heats the first heat conducting plate 400, the second heat conducting element is arranged on the third heat conducting plate 402, namely, the second heat conducting area is annular, and the tubular second heat conducting element uniformly heats the composite plate 403. The first heat conducting plate 400, the second heat conducting plate 401 and the third heat conducting plate 402 have the same shape and are completely overlapped in the second heat conducting area, so that the heat conduction uniformity of the composite plate 403 can be ensured, and the whole is more attractive.

The first heat-conducting plate 400 and the third heat-conducting plate 402 are made of aluminum, the heat conductivity coefficient of the aluminum is 237W/Mk, the heat conduction efficiency is high, the contact parts of the heat-conducting plates and the heating piece and the chassis of the liner 200 are all aluminum plates, the heat of the heating piece can be conveniently diffused to the chassis of the liner 200, the material of the second heat-conducting plate 401 can be iron or stainless steel, the heat conductivity coefficient of the stainless steel is 17W/Mk, and the heat conductivity coefficient of the iron is 80W/Mk, so that the overall heat conductivity coefficient of the composite plate 403 is reduced.

It is understood that the materials of the first heat conductive plate 400, the second heat conductive plate 401, and the third heat conductive plate 402 may be other combinations, as long as the thermal conductivity of the composite plate 403 is smaller than that of the first heat conductive plate 400.

As shown in fig. 4, during operation of the heating assembly, there are four temperature points, temperature T1 at the junction of the first heat-transfer plate 400 and the chassis of the liner 200 in the first heat-transfer region, temperature T2 at the junction of the first heat-transfer plate 400 and the first heating element 300 in the first heat-transfer region, temperature T3 at the junction of the composite plate 403 and the chassis of the liner 200 in the second heat-transfer region, and temperature T4 at the junction of the composite plate 403 and the second heating element 301 in the second heat-transfer region.

Assuming that the cross-sectional areas of the two heating members are the same and the lengths are different, the power of the first heating member 300 is smaller than that of the second heating member 301, the surface heat load of the first heating member 300 is smaller than that of the second heating member 301.

Under the same working time, the following can be calculated: t4 > T2, T4 > T3, T2 > T1.

For noise reduction purposes, T1 and T3 should be equal to each other as much as possible.

Let the thermal conductivity of the first thermal conductive plate 400 be K1, the thermal conductivity of the composite plate 403 be K2, the surface thermal load of the first heating element 300 be P1, and the surface thermal load of the second heating element 301 be P2.

Theoretically, it satisfies: (P1/P2) = (K2/K1). In the working process of the heating component, the heating temperature T1 of the chassis of the liner 200 above the first heating element 300 is ensured to be equal to the heating temperature T3 of the chassis of the liner 200 above the second heating element 301 as much as possible by controlling the variables, so that the purpose of noise reduction is achieved.

However, in practice, the thermal conductivity coefficient, the plate thickness, the material, the welding fixing manner and the like of the three-layer composite plate 403 are related, and in consideration of the thermal conductivity gap existing between the composite plates 403 in practice, the power of each heating element and the plate thickness of each layer plate should be as rounded as possible in consideration of the practical production, so that the processing production is convenient, and the theoretical value of K2 is larger than the practical value, so that P1/P2 is slightly larger than K2/K1.

In practice, it is satisfied that: 1.2 (K2/K1) > (P1/P2) > (K2/K1). Therefore, T1 and T3 are equal as much as possible, the heat of the unit area of the chassis of the liner 200 conducted by the heating component is more uniform, the collision motion of transverse conduction in the conduction of water molecule heat is reduced, the rapid vibration during heat release is slowed down, the generation of bubbles is reduced, the noise is reduced, and the aim of reducing the noise while improving the power is fulfilled.

In addition to the above three-layer composite plate 403, in order to achieve the partitioning of the first and second heat transfer areas on the heat transfer plate, referring to fig. 5, in one embodiment of the present utility model, the heat transfer plate includes a first heat transfer plate 400 and a second heat transfer plate 401, the first heat transfer plate 400 is disposed at the lower end of the chassis of the liner 200, the second heat transfer plate 401 is embedded into the first heat transfer plate 400 to form the composite plate 403, the first heating member 300 is disposed at the lower end of the first heat transfer plate 400 and is located outside the second heat transfer plate 401, and the second heating member 301 is disposed at the lower end of the first heat transfer plate 400 and is located below the second heat transfer plate 401, and the heat conductivity of the first heat transfer plate 400 is greater than that of the second heat transfer plate 401. The second heat conducting area on the inner side is arranged with a composite board 403, the composite board 403 is a double-layer board formed by compositing a first heat conducting board 400 and a second heat conducting board 401, the heat conducting coefficient of the second heat conducting board 401 is smaller than that of the first heat conducting board 400, the second heat conducting board 401 is embedded in the first heat conducting board 400, the second heating element 301 is arranged at the lower end of the composite board 403, the first heat conducting area on the outer side is arranged with the first heat conducting board 400, the outer layer board of the composite board 403 extends outwards, and the first heat conducting element is arranged on the extension part of the first heat conducting board 400. The overall heat conductivity of the composite plate 403 is lower than that of the first heat conducting plate 400, the composite plate 403 delays heat accumulation of the second heating element 301 corresponding to the position above the composite plate 403, and the outer layer plate of the composite plate 403 is the first heat conducting plate 400 with good heat conductivity and conducts heat to the center of the chassis of the liner 200, so that the chassis of the liner 200 is heated uniformly.

The first heat conducting plate 400 is aluminum, the heat conductivity coefficient of aluminum is 237W/Mk, the material of the second heat conducting plate 401 can be iron or stainless steel, the heat conductivity coefficient of stainless steel is 17W/Mk, and the heat conductivity coefficient of iron is 80W/Mk, so that the overall heat conductivity coefficient of the composite plate 403 is reduced. The aluminum plate has high heat conduction efficiency, and the steel plate is wrapped in the aluminum plate, so that the contact parts of the heat conduction plate and the heating element as well as the chassis of the liner 200 can be ensured to be aluminum plates, and the heat of the heating element can be conveniently diffused to the chassis of the liner 200. The steel plate may be formed in the aluminum plate by die casting.

It is understood that the materials of the first heat conductive plate 400 and the second heat conductive plate 401 may be other combinations, as long as the thermal conductivity of the composite plate 403 is smaller than that of the first heat conductive plate 400.

Specifically, the first heat-conducting plate 400 and the second heat-conducting plate 401 are both in a concentric ring shape, the outer diameter of the first heat-conducting plate 400 is larger than that of the second heat-conducting plate 401, the first heating element 300 is arranged around the lower end of the first heat-conducting plate 400 and is located on the outer side of the second heat-conducting plate 401, and the second heating element 301 is arranged around the lower end of the first heat-conducting plate 400 and is located below the second heat-conducting plate 401. The first heating element 300 and the second heating element 301 are tubular, the first heating element 300 is arranged on the first heat conducting plate 400 and is located outside the second heat conducting plate 401, namely, the first heat conducting area is annular, the tubular first heat conducting element uniformly heats the part of the first heat conducting plate 400 located outside the second heat conducting plate 401, the second heat conducting element is arranged on the first heat conducting plate 400 and is located below the second heat conducting plate 401, namely, the second heat conducting area is annular, and the tubular second heat conducting element uniformly heats the composite plate 403.

The foregoing embodiments are provided for further explanation of the present utility model and are not to be construed as limiting the scope of the present utility model, and some insubstantial modifications and variations of the present utility model, which are within the scope of the utility model, will be suggested to those skilled in the art in light of the foregoing teachings.

Claims (10)

1. The utility model provides a liquid heater, includes the kettle body that has the inner bag, is equipped with heating element on the chassis of inner bag, its characterized in that: the heating assembly comprises a first heating element, a second heating element and a heat conducting plate, wherein the heat conducting plate is provided with a first heat conducting area and a second heat conducting area, the first heat conducting area is positioned at the outer side of the second heat conducting area in a horizontal space, the heat conducting coefficient of the heat conducting plate in the first heat conducting area is larger than that of the heat conducting plate in the second heat conducting area, the first heating element is arranged in the first heat conducting area, the second heating element is arranged in the second heat conducting area, the power of the first heating element is smaller than that of the second heating element, and the sum of the power of the first heating element and the power of the second heating element is larger than 1800W and smaller than 2200W.

2. A liquid heater as claimed in claim 1, wherein: the heat conducting plate comprises a first heat conducting plate, a second heat conducting plate and a third heat conducting plate, wherein the first heat conducting plate is arranged at the lower end of a chassis of the inner container, the first heat conducting plate, the second heat conducting plate and the third heat conducting plate are sequentially stacked from top to bottom in the second heat conducting area to form a composite plate, the projection of the composite plate on the horizontal plane is positioned in the projection of the first heat conducting plate on the horizontal plane, the first heating element is arranged at the lower end of the first heat conducting plate and is positioned outside the composite plate, the second heating element is arranged at the lower end of the composite plate, and the heat conductivity of the first heat conducting plate and the heat conductivity of the third heat conducting plate are the same and larger than the heat conductivity of the second heat conducting plate.

3. A liquid heater as claimed in claim 1, wherein: the heat conducting plate comprises a first heat conducting plate and a second heat conducting plate, the first heat conducting plate is arranged at the lower end of the chassis of the liner, the second heat conducting plate is embedded into the first heat conducting plate to form a composite plate, the first heating piece is arranged at the lower end of the first heat conducting plate and is located outside the second heat conducting plate, the second heating piece is arranged at the lower end of the first heat conducting plate and is located below the second heat conducting plate, and the heat conductivity coefficient of the first heat conducting plate is larger than that of the second heat conducting plate.

4. A liquid heater as claimed in claim 1 or 2 or 3, wherein: the heat conduction coefficient of the heat conduction plate of the first heat conduction area is K1, the heat conduction coefficient of the heat conduction plate of the second heat conduction area is K2, the surface heat load of the first heating element is P1, the surface heat load of the second heating element is P2, (P1/P2) = (K2/K1).

5. A liquid heater as claimed in claim 1 or 2 or 3, wherein: the heat conduction coefficient of the heat conduction plate of the first heat conduction area is K1, the heat conduction coefficient of the heat conduction plate of the second heat conduction area is K2, the surface heat load of the first heating element is P1, and the surface heat load of the second heating element is P2,1.2 (K2/K1) > (P1/P2) > (K2/K1).

6. A liquid heater as claimed in claim 2, wherein: the first heat conducting plate, the second heat conducting plate and the third heat conducting plate are completely overlapped in the second heat conducting area.

7. A liquid heater as claimed in claim 2, wherein: the first heat conducting plate and the third heat conducting plate are made of aluminum material components, and the second heat conducting plate is made of iron or steel material components.

8. A liquid heater as claimed in claim 2, wherein: the first heat conducting plate, the second heat conducting plate and the third heat conducting plate are all in concentric annular arrangement, the outer diameter of the first heat conducting plate is larger than that of the third heat conducting plate, the first heating element is arranged at the lower end of the first heat conducting plate in a surrounding mode and is located at the outer side of the second heat conducting plate, and the second heating element is arranged at the lower end of the third heat conducting plate in a surrounding mode and is located below the second heat conducting plate.

9. A liquid heater as claimed in claim 3, wherein: the first heat-conducting plate is made of an aluminum material member, and the second heat-conducting plate is made of an iron or steel material member.

10. A liquid heater as claimed in claim 3, wherein: the first heat-conducting plate and the second heat-conducting plate are both in a concentric annular shape, the outer diameter of the first heat-conducting plate is larger than that of the second heat-conducting plate, the first heating element is arranged at the lower end of the first heat-conducting plate in a surrounding mode and is located at the outer side of the second heat-conducting plate, and the second heating element is arranged at the lower end of the first heat-conducting plate in a surrounding mode and is located below the second heat-conducting plate.