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WO2019080590A1 - Ensemble récipient interne et dispositif de chauffage de liquide - Google Patents

Ensemble récipient interne et dispositif de chauffage de liquide

Info

Publication number
WO2019080590A1
WO2019080590A1 PCT/CN2018/099284 CN2018099284W WO2019080590A1 WO 2019080590 A1 WO2019080590 A1 WO 2019080590A1 CN 2018099284 W CN2018099284 W CN 2018099284W WO 2019080590 A1 WO2019080590 A1 WO 2019080590A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
thermal conductivity
conductive layer
inner liner
electric heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/099284
Other languages
English (en)
Chinese (zh)
Inventor
梅长云
李洪伟
何柏锋
马向阳
李兴航
柳维军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Original Assignee
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201711039863.XA external-priority patent/CN109717735B/zh
Priority claimed from CN201711173253.9A external-priority patent/CN109805749A/zh
Priority claimed from CN201721571938.4U external-priority patent/CN208435288U/zh
Application filed by Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd filed Critical Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Publication of WO2019080590A1 publication Critical patent/WO2019080590A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/21—Water-boiling vessels, e.g. kettles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details

Definitions

  • the present application relates to the field of living electrical appliances, and in particular to a liner assembly and a liquid heater.
  • liquid heaters on the market such as electric kettles and electric kettles, mostly use 304 stainless steel.
  • the bubbles will store a large number of large bubbles, and the larger bubbles will be released from the bottom wall of the kettle. Larger noise, especially between 55 °C and 75 °C, is the most noisy.
  • the main object of the present application is to propose a liner assembly and a liquid heater, which aim to solve the problem of generating large noise in the heating process of the existing liquid heater.
  • the inner liner assembly of the present application is for a liquid heater, and the inner liner assembly comprises:
  • a high thermal conductivity layer disposed on an outer surface of the inner wall of the inner liner, the thermal conductivity of the high thermal conductivity layer is greater than or equal to 100W / m.k;
  • An electric heating tube mounted on an outer surface of the highly thermally conductive layer
  • hydrophobic coating disposed on an inner surface of the bottom wall of the inner liner such that a bottom surface of the inner liner is formed with a hydrophobic region covering the hydrophobic coating, and the electric heating tube is located in the hydrophobic region
  • the bubble contact angle of the hydrophobic coating is ⁇ , and 95° ⁇ ⁇ ⁇ 135°.
  • the hydrophobic coating has a thickness of from 5 ⁇ m to 500 ⁇ m.
  • the hydrophobic coating has a thickness of from 10 ⁇ m to 100 ⁇ m.
  • the hydrophobic coating has a thickness of from 15 ⁇ m to 50 ⁇ m.
  • the hydrophobic coating is a PEEK layer, a fluorine coating or a silicon coating.
  • the hydrophobic coating is disposed in an annular region; or the disposed region of the hydrophobic coating covers a center of the inner surface of the bottom wall.
  • the high thermal conductivity layer is a high thermal conductivity plate or a high thermal conductivity coating.
  • the application also provides a liner assembly for a liquid heater, the liner assembly comprising:
  • a low thermal conductive coating attached to the outer surface of the inner wall of the inner liner, the low thermal conductive coating having a thermal conductivity of less than or equal to 50 W / m.k;
  • the high thermal conductivity layer has a thermal conductivity greater than or equal to 100 W/m.k;
  • An electric heating tube is mounted on the highly thermally conductive layer.
  • the low thermal conductivity coating has a thermal conductivity less than or equal to 10 W/m.k.
  • the low thermal conductive coating has a thickness of from 0.1 mm to 1.5 mm.
  • the material of the low thermal conductive coating is Fe, 304 stainless steel, 430 stainless steel, Al 2 O 3 or ZrO 2 .
  • the high thermal conductivity layer is a heat conducting plate; and/or the high thermal conductive layer has a thickness of 0.5 mm to 2 mm.
  • the low thermal conductive coating is annular, and a central portion of the high thermal conductive layer is provided with a convex portion embedded in the central through hole of the low thermal conductive coating and directly in thermal contact with the outer surface of the inner wall of the inner liner. Taiwan; or,
  • the low thermal conductive coating covers the entire outer surface of the inner bottom wall, and the high thermal conductive layer covers at least the electric heating tube and its surrounding peripheral area; or
  • the highly thermally conductive layer covers the entire low thermal conductivity coating and extends to at least the outer surface of the bottom of the liner sidewall.
  • the application also provides a liquid heater comprising a liner assembly, the liner assembly comprising:
  • a high thermal conductivity layer disposed on an outer surface of the inner wall of the inner liner, the thermal conductivity of the high thermal conductivity layer is greater than or equal to 100W / m.k;
  • An electric heating tube mounted on an outer surface of the highly thermally conductive layer
  • hydrophobic coating disposed on an inner surface of the bottom wall of the inner liner such that a bottom surface of the inner liner is formed with a hydrophobic region covering the hydrophobic coating, and the electric heating tube is located in the hydrophobic region
  • the bubble contact angle of the hydrophobic coating is ⁇ , and 95° ⁇ ⁇ ⁇ 135°.
  • the hydrophobic coating has a thickness of from 5 ⁇ m to 500 ⁇ m.
  • the application also provides a liquid heater comprising a liner assembly, the liner assembly comprising:
  • a low thermal conductive coating attached to the outer surface of the inner wall of the inner liner, the low thermal conductive coating having a thermal conductivity of less than or equal to 50 W / m.k;
  • the high thermal conductivity layer has a thermal conductivity greater than or equal to 100 W/m.k;
  • An electric heating tube is mounted on the highly thermally conductive layer.
  • the low thermal conductivity coating has a thermal conductivity less than or equal to 10 W/m.k.
  • the liquid heater comprises a liner assembly.
  • the bubble contact angle of the hydrophobic coating is ⁇ , and 95° ⁇ 135 °.
  • the inventor of the present application found in the research process that during the water boiling process, a large number of small bubbles are generated in the bottom wall of the inner tank opposite to the electric heating tube, and the small bubbles absorb the energy and quickly disengage from the bottom wall of the inner tank.
  • the small bubbles contain less energy, and when they rise a little, they will be broken by the heat absorbed by the lower temperature of the bottom of the liner, and the time when the small bubbles leave the bottom wall of the liner is the same as the bottom wall.
  • the bubble contact angle of the surface is related. The larger the bubble contact angle, the slower the velocity of the small bubble from the bottom wall of the liner, so that the small bubble can grow as much as possible before leaving the bottom wall of the liner to surround the small bubbles.
  • the polymerization is formed into a large bubble, and a part of the heat is absorbed by the surrounding liquid during the rising of the bubble.
  • the bubble When the bubble floats out of the water surface, the bubble stores less energy, and at the same time, the water surface is broken, and the noise generated by the corresponding rupture is also small.
  • the present invention delays the velocity of the bubble from the bottom wall of the liner, thereby reducing the noise generated when the liquid heater is heated, improving the user experience of the product, and also avoiding the bubble. Excessive contact angles make it difficult for the bubbles to detach, and a vapor pad is formed at the bottom of the liquid heater, causing the occurrence of film boiling and the consequences of heat transfer at the bottom of the liquid heater.
  • the high thermal conductive layer can not only transfer the heat of the electric heating pipe to the surface of the entire low thermal conductive coating as quickly as possible, but also prevent the heat of the electric heating pipe from being emitted and damaged.
  • the thermal conductivity of the low thermal conductive coating is less than or equal to 50 W/m.k, which can slow the transfer of heat along the thickness of the bottom wall of the inner liner, and correspondingly increase the time of heat transfer along the thickness of the inner wall of the inner liner. Due to the extension of the heat transfer time of the electric heating tube along the thickness of the bottom wall of the inner liner, the heat transferred from the contact area between the inner liner and the electric heating tube to the plane of the inner bottom wall of the inner liner is correspondingly increased, so that the power of the inner contact zone between the inner liner and the electric heating tube is increased. The density is reduced, thereby reducing the number of bubbles generated in the contact area between the inner liner and the electric heating tube, thereby reducing the noise generated by the inner liner assembly during heating.
  • Figure 1 is a schematic diagram showing the definition of the bubble contact angle
  • FIG. 2 is a schematic view showing the principle of heating of an electric heating tube of a conventional liquid heater
  • FIG. 3 is a schematic view showing the principle of heating of the electric heating pipe of the first embodiment of the liquid heater provided by the present application;
  • Figure 4 is a perspective view showing the structure of the liquid heater shown in Figure 3;
  • FIG. 5 is a schematic perspective structural view of a first embodiment of a liner assembly provided by the present application.
  • Figure 6 is a cross-sectional view of the inner liner assembly of Figure 5;
  • Figure 7 is a partial enlarged view of the portion A in Figure 6;
  • FIG. 8 is a partially enlarged schematic view showing the same position of the second embodiment of the inner liner assembly provided in FIG.
  • FIG. 9 is a partially enlarged schematic view showing the same position of the third embodiment of the inner liner assembly provided in FIG.
  • FIG. 10 is a partially enlarged schematic view showing the same position of the fourth embodiment of the inner liner assembly provided in FIG.
  • FIG. 11 is a partially enlarged schematic view showing the same position as the portion A in FIG. 6 in the fifth embodiment of the inner liner assembly provided by the present application.
  • the directional indication is only used to explain the relative positional relationship, the motion situation, and the like between the components in a certain posture, if the specific posture changes. Then, the directional indication also changes accordingly.
  • the bubble contact angle of the hydrophobic coating refers to the tangent of the gas/liquid interface at the solid/liquid/gas three-phase intersection, and the angle ⁇ between the tangent and the solid/liquid boundary.
  • the application provides a liquid heater.
  • the liquid heater can be an electric kettle, an electric hot water bottle or a coffee pot. The following is an example of an electric kettle.
  • the liquid heater can be a double pot body structure, that is, including a liner.
  • the outer casing, or a single-layer pot body structure, that is, only the inner tank is included.
  • 3 and 4 are a first embodiment of a liquid heater provided by the present application, the liquid heater including a liner assembly.
  • the liquid heater 200 includes a liner assembly 100, a lid 4, a lid open button 5, a handle 6, a switch 7, a base 8 and a housing 9, and the inner liner assembly 100 is provided.
  • the lid 4 is controlled by the lid opening button 5, and the inner liner assembly 100 is opened and closed.
  • the pot body can be lifted by the handle 6, and placed on the base 8 to supply power to the inner liner assembly 100.
  • FIG. 5 to FIG. 7 are the first embodiment of the inner liner assembly provided by the present application.
  • the inner liner assembly 100 includes a inner liner 1, a high thermal conductive layer, an electric heating tube 3 and a hydrophobic coating 2a.
  • the high thermal conductive layer is disposed on the outer surface of the bottom wall 11 of the inner liner 1, the thermal conductivity of the high thermal conductive layer is greater than or equal to 100 W/mk, the electric heating tube 3 is mounted on the outer surface of the high thermal conductive layer, and the hydrophobic coating 2a is disposed on the inner liner 1
  • the inner surface of the bottom wall 11 (generally using an electrostatic spraying process), so that the bottom wall 11 of the inner liner 1 is formed with a hydrophobic region covering the hydrophobic coating 2a, and the electric heating tube 3 is located in the hydrophobic region, and the bubble contact of the hydrophobic coating 2a
  • the angle is ⁇ , and 95° ⁇ 135° (the side wall 12 of the inner tank 1 is provided with the spout 14 and the spout 14 can be integrally formed with the side wall 12, so that the installation process is simplified, and the product as a whole is more beautiful; It is also possible that the spouts 14 are separately provided and then connected to the side walls 12,
  • the liquid heater 200 includes a liner assembly 100.
  • the inner surface of the bottom wall 11 of the liner 1 is provided with a hydrophobic coating 2a, and the bubble contact angle of the hydrophobic coating 2a is ⁇ , and 95°. ⁇ ⁇ ⁇ 135°.
  • a large number of small bubbles are generated in the bottom wall 11 of the inner tank 1 at a position opposite to the electric heating tube 3, and the small bubbles absorb the energy and quickly disengage from the bottom wall 11 of the inner liner 1, small bubbles.
  • the energy contained in it is relatively small. When it rises a little, it will be broken by the heat absorbed by the lower temperature of the bottom of the liner 1.
  • the material of the existing electric kettle liner is generally 304 stainless steel.
  • the bubble contact angle ranges from 80° ⁇ ⁇ ⁇ 90°.
  • the total energy at a certain point on the solid surface is smaller than the total energy in the vicinity (ie, ⁇ E ⁇ 0), the bubble is likely to stay and adhere there, and the bubble contact angle of the hydrophobic coating 2a is set to ⁇ , and 95° ⁇ ⁇ ⁇ At 135°, small bubbles adhere to the surface of the hydrophobic coating 2a, and the speed at which the small bubbles are separated from the bottom wall 11 of the liner 1 is slower, so that the small bubbles can grow as much as possible before being separated from the bottom wall 11 of the liner 1.
  • the small bubbles are aggregated into large bubbles, and a part of the heat is absorbed by the surrounding liquid when the bubbles rise.
  • the present application delays the velocity of the bubble from the bottom wall 11 of the inner liner 1 by selecting the hydrophobic coating 2a having a suitable bubble contact angle, thereby reducing the noise generated when the liquid heater 200 is heated, improving the user experience of the product, and, It is also avoided that the bubble is difficult to detach due to the bubble contact angle being too large, and a vapor pad is formed at the bottom of the liquid heater 200, causing the occurrence of film boiling, and producing a heat transfer effect which is disadvantageous to the bottom of the liquid heater 200.
  • the electric heating kettle with a heating power of 1800W is used.
  • the water in the pot is 1.3L-1.7L, and the electric heating tube with a diameter of 110mm.
  • the minimum thermal efficiency of the electric kettle should be not less than 85%.
  • the electric kettle shown in the structure of Fig. 7 is used.
  • the hydrophobic coating 2a (the hydrophobic coating 2a has a diameter of 120 mm and the thickness is 5 ⁇ m)
  • the experimental data corresponding to the bubble contact angles are shown in Table 2 below.
  • the thermal efficiency value also tends to decrease as a whole.
  • the thermal efficiency value is 84.7%, which is lower than 85% and does not meet the safety regulations.
  • ⁇ 95° the liquid heater 200 has a poor noise reduction effect.
  • a larger bubble contact angle is obtained by changing the value of ⁇ by adding a hydrophobic group to the substrate of the hydrophobic coating 2a, and the commonly used hydrophobic coating 2a
  • the substrate is a PEEK layer (the ⁇ of the PEEK layer is 100° to 105°) and the fluororesin layer (the ⁇ of the fluororesin layer is 115° to 120°), and a hydrophobic coating 2a having a ⁇ of 120° or more is obtained. It can be realized by adding a hydrophobic group to the PEEK layer and the fluororesin layer, but the larger the ⁇ , the higher the cost.
  • the range of the bubble contact angle can be optimized to be 95° ⁇ ⁇ ⁇ 120°, and the hydrophobic coating 2a corresponding to the ⁇ value can be obtained without too much process adjustment on the substrate, and, as shown in Table 2,
  • the maximum sound power can be reduced by up to 20.02dB, and the average sound power can be reduced by up to 15.99dB.
  • the noise reduction effect is good and the price is high.
  • the range is 100 ° ⁇ ⁇ ⁇ 110 °, and the thermal efficiency values are all higher than 87%, which can facilitate the external heat transfer of the electric heating tube 3, prolong the service life of the electric heating tube 3, and the maximum sound power is reduced by at least 8.82 dB.
  • the average sound power is reduced by at least 7.59dB, the noise reduction effect is good, and the production process of the hydrophobic coating 2a is relatively simple and cost-effective.
  • the bubble contact angle ⁇ is related to the material of the hydrophobic coating 2a. For this reason, in the first embodiment of the present application, the bubble contact angle ⁇ is changed by selecting a different material to form the hydrophobic coating 2a. the size of.
  • the hydrophobic coating 2a is a PEEK layer, a fluorine coating or a silicon coating.
  • the PEEK layer has a bubble contact angle of 100° to 105°, and the bubble contact angle of the fluororesin layer is 115° to 120°, changing the hydrophobicity by adding a hydrophobic group (hydrocarbyl group, ester group, polyoxypropylene group, long chain perfluoroalkyl group, polysiloxane group) to the PEEK layer, fluorine coating or silicon coating The bubble contact angle of the coating 2a.
  • a hydrophobic group hydrocarbyl group, ester group, polyoxypropylene group, long chain perfluoroalkyl group, polysiloxane group
  • the small bubbles can be polymerized to form large bubbles, so that as the bubble contact angle of the hydrophobic coating 2a increases, the smaller the smaller the bubbles It is easy to be separated from the bottom wall 11 of the inner liner 1, and the large bubble size formed by the polymerization of small bubbles is also larger.
  • the bubble contact angle within the above range, the diameter of the bubble generated by the hydrophobic coating 2a when it is separated from the hydrophobic coating 2a In the range of 8 mm to 20 mm, the noise generated by the liquid heater 200 is small, and the influence on the heating efficiency of the liquid heater 200 is relatively small.
  • the electric kettle shown in the structure of Fig. 7 is selected.
  • the hydrophobic coating 2a (the diameter of the hydrophobic coating 2a is 120, ⁇ is 100°, which is the PEEK layer), the experimental data corresponding to the thickness is shown in the following table. 3.
  • the thermal efficiency value is 84.8%, less than 85%, which does not meet the safety regulations, and the general spraying process is difficult to form the hydrophobic coating 2a of 5 ⁇ m or less, so
  • the thickness of the hydrophobic coating 2a is selected to be 5 ⁇ m to 500 ⁇ m.
  • the thickness of the hydrophobic coating 2a when the thickness is greater than 100 ⁇ m, the maximum sound power and the average sound power are only reduced by 0.01 to 0.02 dB with each increase of the thickness of 100 ⁇ m, and the noise reduction effect is further optimized, but with the hydrophobicity.
  • the increase in the thickness of the coating 2a leads to an increase in cost.
  • the thickness of the hydrophobic coating 2a is less than 10 ⁇ m, the coating is easily worn away and peeled off, so that the thickness of the hydrophobic coating 2a can be optimized. It is from 10 ⁇ m to 100 ⁇ m.
  • the thickness of the hydrophobic coating 2a can be further optimized to be 15 ⁇ m to 50 ⁇ m, the maximum sound power is reduced by at least 9.84dB, and the average sound power is reduced. At least 8.8dB, the noise reduction effect is obvious, the cost performance is higher, the processing technology is simpler, and it is suitable for large-scale mass production.
  • the hydrophobic region covering the hydrophobic coating 2a is formed on the bottom wall 11 of the inner liner 1, and the electric heating tube 3 is placed in the hydrophobic region to reduce the noise generated when the liquid heater 200 is heated.
  • the electric heating tube 3 is located in the hydrophobic region, and the arrangement area of the hydrophobic coating 2a may cover the center of the inner surface of the bottom wall 11, that is, the hydrophobic coating 2a has a disk shape, for example, see the figure. 6 and FIG. 7, in the first embodiment, the hydrophobic coating 2a covers the entire inner surface of the bottom wall 11, so that the setting process is relatively simple and more suitable for large batches.
  • the hydrophobic coating 2a is disposed in an annular region, that is, the hydrophobic coating 2a is annular.
  • the electric heating tube 3 is generally wound in a ring shape, and the noise reduction effect can be achieved not only by providing the annular hydrophobic coating 2a, but also by providing the hydrophobic coating 2a with respect to the entire inner surface of the bottom wall 11, which greatly reduces the production cost. .
  • a hydrophobic coating 2a is added to the existing electric kettle (the hydrophobic coating 2a is a PEEK layer, ⁇ is 100°, the thickness is 5 ⁇ m, and the outer diameter is 120 mm), and the hydrophobic coating 2a is measured when the inner diameter is different.
  • the hydrophobic coating 2a is a PEEK layer, ⁇ is 100°, the thickness is 5 ⁇ m, and the outer diameter is 120 mm
  • Corresponding experimental data are shown in Table 4 below.
  • the inner diameter of the hydrophobic coating 2a can be selected as 40mm to 60mm, good noise reduction and high cost performance.
  • the electric heating tube 3 is located in the hydrophobic region and is mounted on the outer surface of the high thermal conductive layer, and the high thermal conductive layer is greater than or equal to 100 W/mk, and the electric heating tube 3 is connected to the bottom wall 11 of the inner liner 1 through the high thermal conductive layer, thereby increasing The effective heating area of the electric heating tube 3 to the bottom of the inner tank 1 allows the heat of the electric heating tube 3 to be uniformly transmitted to the bottom of the inner tank 1, so that the noise when the liquid heater 200 is heated can be lowered.
  • the high thermal conductive layer may be a high thermal conductive plate or a high thermal conductive coating.
  • the high thermal conductive layer is an aluminum plate 31.
  • the high thermal conductive layer not only has good thermal conductivity, but also has a cost performance ratio. High, and the electric heating tube 3 is installed through the aluminum plate 31, which facilitates the installation and positioning of the electric heating tube 3.
  • the inner liner assembly 100 includes a inner liner 1, a low thermal conductive coating 2b, a high thermal conductive layer 32, and an electric heating tube 3, and a low thermal conductive coating 2b. Attached to the outer surface of the bottom wall 11 of the inner liner 1, the thermal conductivity of the low thermal conductive coating 2b is less than or equal to 50 W/mk, the high thermal conductive layer 32 is attached to the outer surface of the low thermal conductive coating 2b, and the thermal conductivity of the highly thermally conductive layer 32 is The electric heating tube 3 is mounted on the high heat conductive layer 32 when it is greater than or equal to 100 W/mk.
  • the low thermal conductivity coating 2b is preferably a metal coating or a metal salt coating having a porosity of less than 5%, such as a Fe coating having a porosity of 2%, 3%, and 4%, a 304 stainless steel coating, and a 430 stainless steel coating. Layer, Al 2 O 3 coating or ZrO 2 coating.
  • the high heat conductive layer 32 can not only transfer the heat of the electric heating pipe 3 to the surface of the entire low thermal conductive coating 2b as quickly as possible, but also prevent the heat of the electric heating pipe 3 from being dissipated and damaged.
  • the thermal conductivity of the low thermal conductive coating 2b is less than or equal to 50 W/m.k, which can slow the transfer of heat along the thickness direction of the bottom wall 11 of the inner liner 1, and correspondingly increase the time during which heat is transferred along the thickness of the bottom wall 11 of the inner liner 1.
  • the heat transferred from the contact area of the inner liner 1 and the electric heating tube 3 to the plane of the bottom wall 11 of the inner liner 1 is correspondingly increased, so that the inner liner is made 1
  • the power density of the area in contact with the electric heating tube 3 is reduced, thereby reducing the number of bubbles generated in the contact area between the inner tube 1 and the electric heating tube 3, thereby reducing the noise generated by the inner liner assembly 100 during heating.
  • the low thermal conductivity coating 2b is less than or equal to 10 W/mk. In this way, the noise reduction effect of the liquid heater 200 is also good under the premise that the heating efficiency of the liquid heater 200 satisfies the use requirements.
  • the thermal efficiency value is gradually lowered, and when the thermal conductivity of the low thermal conductive coating 2b is between 29 and 50, the heating efficiency is The thermal efficiency of the existing products is not much different. Within 1 percentage point, the average sound power is reduced by at least 7 dB, and the noise reduction effect and heating efficiency can be better.
  • the thermal conductivity of the low thermal conductive coating 2b is gradually reduced, the maximum sound power and the average sound power are lowered.
  • the thermal conductivity of the low thermal conductive coating 2b is less than or equal to 10 W/mk, although the thermal efficiency drops faster, the difference from the prior art is also within 3 percentage points, but the noise value is more significantly reduced than the prior art, at least by 13 dB.
  • ZrO 2 having a thermal conductivity of 10 and a material having a lower thermal conductivity may be used to form the low thermal conductive coating 2b, but the thermal conductivity of the low thermal conductive coating 2b is preferably not less than 5%.
  • the low thermal conductive coating 2b is formed by spraying a material having a low thermal conductivity.
  • the material of the low thermal conductive coating 2b may be Fe, 304 stainless steel, 430 stainless steel, Al 2 O 3 or ZrO 2 (The thermal conductivity of Fe is 48, the thermal conductivity of 304 stainless steel and 430 stainless steel is 45, the thermal conductivity of Al 2 O 3 is 29, and the thermal conductivity of ZrO 2 is 10)
  • the low thermal conductive coating 2b made of these materials can not only slow the longitudinal heat transfer of the contact area, but also reduce the noise of the liquid heater 200 during operation, and the manufacturing cost is relatively low and the cost performance is high.
  • the low thermal conductive coating 2b is made of Al2O3 or ZrO2, and the low thermal conductive coating 2b thus obtained has a better overall performance.
  • the thickness of the low thermal conductive coating 2b also has an effect on slowing the transfer of heat along the thickness of the bottom wall 11 of the inner liner 1, in the third embodiment, low.
  • the thickness of the heat conductive coating 2b is 0.1 mm to 1.5 mm, the low thermal conductive coating 2b is set too thin, easy to fall off, and the noise reduction effect is not good.
  • by limiting the thickness range of the low thermal conductive coating 2b Under the premise of ensuring that the noise of the liquid heater 200 can be well reduced, it is also possible to avoid the waste of cost caused by the excessively thick setting of the low thermal conductive coating 2b, and also affect the heating efficiency of the liquid heater 200, of course.
  • the thickness of the low thermal conductive coating 2b is related to the thermal conductivity of the low thermal conductive coating 2b, and the smaller the thermal conductivity, the thinner the thickness of the low thermal conductive coating 2b can be relatively thinner.
  • a low thermal conductive coating 2b (diameter 120 mm, material Al 2 O 3 , thermal conductivity 29) and a high thermal conductive layer 32 (diameter 110 mm, material Al, thickness 0.5) are provided.
  • the coating of mm has a thermal conductivity of 237).
  • the experimental data corresponding to the measured thickness of the low thermal conductive coating 2b are shown in Table 6 below.
  • the thermal efficiency value is within 1.5 percentage points of the thermal efficiency value of the existing product (89.0%), but the noise is reduced by at least 8 dB, up to 13 dB or more.
  • the thickness of the low thermal conductive coating 2b can generally be set in the range of 0.3 mm to 0.7 mm, for example, 0.5 mm. Not only the noise reduction effect is good, but the heating efficiency is similar to that of the existing products, and the overall performance is better.
  • the low thermal conductive coating 2b as described above has poor thermal conductivity and can reduce heat transfer. Therefore, in order to avoid direct contact between the low thermal conductive coating 2b and the electric heating tube 3, the heat transfer of the electric heating tube 3 is affected, resulting in an electric heating tube.
  • the dry burning of 3 affects the service life of the electric heating tube 3.
  • the outer surface of the low thermal conductive coating 2b is also adhered with a high thermal conductive layer 32, and the thermal conductivity of the high thermal conductive layer 32 is greater than or equal to 100 W/mk (for example, The thermal conductivity of the 6061 aluminum alloy is 155 W/mk, and the electric heating tube 3 is mounted on the high thermal conductive layer 32.
  • the high thermal conductive layer 32 avoids the direct contact between the low thermal conductive coating 2b and the electric heating tube 3, which not only facilitates the rapid external heat transfer of the electric heating tube 3, but also reduces the damage to the electric heating tube 3, so the high thermal conductive layer 32
  • the thermal conductivity can be as high as possible.
  • the high thermal conductivity layer 32 is an aluminum coating having a thermal conductivity greater than or equal to 200 W/mk to 237. W/m.k, this is more conducive to the external transfer of heat from the electric heating tube 3.
  • the high thermal conductivity layer 32 is formed by selecting a material having a high thermal conductivity, and in addition to the above aluminum, it may be made of copper.
  • the thermal conductive layer 32 has a thermal conductivity of 401.
  • the high thermal conductive layer 32 made of the above material not only has good thermal conductivity, but also has relatively low production cost and various comprehensive properties.
  • the thickness of the high heat conductive layer 32 also affects the external heat transfer of the electric heating tube 3, and the thickness of the high heat conductive layer 32 is The high heat conductive layer 32 is disposed (the high heat conductive layer 32 may be a metal heat conductive plate or a sprayed layer, and the metal heat conductive plate is relatively low in production cost, and the sprayed layer can increase the effective thermal contact area between the high heat conductive layer 32 and other layers)
  • the high heat conductive layer 32 is a metal heat conductive plate
  • the thickness of the metal heat conductive plate is 0.5 mm to 2 mm
  • the high heat conductive layer 32 is a sprayed layer
  • the thickness of the sprayed layer is 0.1 mm to 0.5 mm
  • the arrangement can not only ensure better heat transfer of the electric heating tube 3, but also reduce the influence of the arrangement of the low thermal conductive coating 2b on the electric heating tube 3, and
  • the main function of the high thermal conductivity layer 32 is to effectively transfer the heat of the electric heating tube 3 to avoid direct contact between the low thermal conductive coating 2b and the electric heating tube 3, and the problem of dry burning of the electric heating tube 3, so the high thermal conductivity layer
  • the setting of 32 is related to the area in which the low thermal conductive coating 2b is disposed, as will be described in detail below.
  • the low thermal conductive coating 2b covers the outer surface of the bottom wall 11 of the entire inner liner 1, and the corresponding highly thermally conductive layer 32
  • the low thermal conductive coating 2b can be prevented from directly contacting the electric heating tube 3 only by covering the electric heating tube 3 and its surrounding peripheral area.
  • the high thermal conductive layer 32 is disposed not only to cover the electric heating tube 3 but also to cover the electric heating tube 3.
  • the processing process is relatively simple. For example, after polishing the outer surface of the bottom wall 11 of the inner liner 1, the low thermal conductive coating 2b is sprayed on the outer surface of the entire bottom wall 11, and then the low thermal conductivity is applied. The outer surface of the coating 2b is sprayed with the high heat conductive layer 32, and finally the outer surface of the high heat conductive layer 32 is welded to the electric heating tube 3. If the high heat conductive layer 32 is formed by cold spraying, the outer surface of the high heat conductive layer 32 may not be polished.
  • the function of the low thermal conductive coating 2b is to slow the transfer of heat along the thickness direction of the bottom wall 11 of the inner liner 1, and the laying area of the low thermal conductive coating 2b covers at least the contact area, so that the low thermal conductive coating 2b can be disposed in an annular region.
  • the layout area of the low thermal conductive coating 2b is annular, please refer to FIG. 10.
  • the low thermal conductive coating 2b is annular, and the high thermal conductive layer 32 is attached to the low thermal conductive coating 2b.
  • the surface, and the middle portion of the high heat conductive layer 32 is provided with a boss 33 embedded in the central through hole of the low heat conductive coating 2b and directly in thermal contact with the outer surface of the bottom wall 11 of the inner liner 1, which can be increased by the arrangement of the boss 33
  • the heat transfer in the plane of the bottom wall 11 of the bladder 1 increases the heating area of the bottom of the liner 1, further reducing the noise generated when the liquid heater 200 is operated.
  • the high heat conductive layer 32 and the boss 33 are integrally formed, and the same material and manner are used to make high heat conductivity.
  • the layer 32 and the boss 33 may be after first grinding the outer surface of the bottom wall 11 of the inner liner 11, spraying an annular low thermal conductive coating 2b on the outer surface of the entire bottom wall 11, and then on the low thermal conductive coating 2b. The outer surface is sprayed with the high heat conductive layer 32 and the boss 33. Finally, the outer surface of the high heat conductive layer 32 is welded to the electric heating tube 3. If the high heat conductive layer 32 is formed by cold spraying, the outer surface of the high heat conductive layer 32 may not be polished. The process is relatively simple.
  • the boss 33 to achieve the above effects may be disposed in a manner different from the material and/or manner of the high heat conductive layer 32.
  • the high heat conductive layer 32 is provided.
  • the boss 33 is a sprayed layer.
  • an annular low thermal conductive coating 2b is sprayed on the outer surface of the entire bottom wall 11.
  • the electric kettle having the structure shown in FIG. 10 is selected, and the low thermal conductive coating 2b (the outer diameter is 120 mm, the material is Al 2 O 3 , the thermal conductivity is 29, the thickness is 0.5 mm) and the high thermal conductive layer 32 (the material is Al,
  • the coating having a thickness of 0.5 mm has a thermal conductivity of 237 and an outer diameter of 110 mm.
  • the central portion of the high thermal conductive layer 32 is provided with a boss embedded in the low thermal conductive layer and in thermal contact with the outer surface of the inner liner.
  • the low thermal conductive coating 2b is measured.
  • Table 7 The experimental data corresponding to the different inner diameters are shown in Table 7 below.
  • the high heat conductive layer 32 may cover the entire low heat conductive coating 2b and extend to at least the outer surface of the bottom portion of the side wall 12 of the inner liner 1 through the outer side wall 12 of the inner liner 1.
  • the surface is provided with a high heat conductive layer 32, which further increases the heating area of the bottom of the inner liner 1, so that the heat of the bottom of the inner liner 1 is more uniform, reduces the noise generated when the liquid heater 200 operates, and improves the heating of the liquid heater 200. effectiveness.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)

Abstract

L'invention concerne un ensemble récipient interne (100) et un dispositif de chauffage de liquide. L'ensemble récipient interne (100) comprend un récipient interne (1), une couche à haute conductivité thermique (32), un tube de chauffage électrique (3) et un revêtement hydrophobe (2a). La couche à haute conductivité thermique (32) est disposée sur la surface externe d'une paroi inférieure du récipient interne (1), et la conductivité thermique de la couche à haute conductivité thermique (32) est supérieure ou égale à 100 W/m.k. Le tube de chauffage électrique (3) est monté sur la surface externe de la couche à haute conductivité thermique (32), et le revêtement hydrophobe (2a) est disposé sur la surface interne de la paroi inférieure (11) du récipient interne (1), de telle sorte qu'une région hydrophobe recouvrant le revêtement hydrophobe (2a) soit formée sur la paroi inférieure (11) du récipient interne (1). Le tube de chauffage électrique (3) est situé dans la région hydrophobe, l'angle de contact de bulle du revêtement hydrophobe (2a) est θ, et 95° ≤ θ ≤ 135°. Ou bien, l'ensemble récipient interne (100) comprend le récipient interne (1), le tube de chauffage électrique (3), la couche à haute conductivité thermique (32) et un revêtement à faible conductivité thermique (2b). Le revêtement à faible conductivité thermique (2b) est fixé sur la surface externe de la paroi inférieure (11) du récipient interne (1), et la conductivité thermique du revêtement à faible conductivité thermique (2b) est inférieure ou égale à 50 W/m.k. La couche conductrice à haute conductivité thermique (32) est fixée sur la surface externe du revêtement à faible conductivité thermique (2b), la conductivité thermique de la couche à haute conductivité thermique (32) est supérieure ou égale à 100 W/m.k, et le tube de chauffage électrique (3) est monté sur la couche à haute conductivité thermique (32).
PCT/CN2018/099284 2017-10-27 2018-08-08 Ensemble récipient interne et dispositif de chauffage de liquide Ceased WO2019080590A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201711039863.X 2017-10-27
CN201711039863.XA CN109717735B (zh) 2017-10-27 2017-10-27 内胆组件以及液体加热器
CN201721571938.4 2017-11-21
CN201711173253.9A CN109805749A (zh) 2017-11-21 2017-11-21 内胆组件以及液体加热器
CN201711173253.9 2017-11-21
CN201721571938.4U CN208435288U (zh) 2017-11-21 2017-11-21 内胆组件以及液体加热器

Publications (1)

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WO2019080590A1 true WO2019080590A1 (fr) 2019-05-02

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386532A (en) * 2001-11-29 2003-09-17 Strix Ltd Electric water heater with reduced noise level
CN1162044C (zh) * 1999-05-04 2004-08-11 奥特控制有限公司 加热元件组件和液件加热容器
CN1915150A (zh) * 2005-08-18 2007-02-21 施特里克斯有限公司 电液体加热器
CN106993940A (zh) * 2016-01-22 2017-08-01 广东美的生活电器制造有限公司 液体加热容器
CN207095036U (zh) * 2017-08-29 2018-03-13 广东美的生活电器制造有限公司 内胆以及液体加热器
CN207341622U (zh) * 2017-04-28 2018-05-11 佛山市顺德区美的电热电器制造有限公司 电水壶
CN207341623U (zh) * 2017-04-28 2018-05-11 佛山市顺德区美的电热电器制造有限公司 电水壶
CN207555996U (zh) * 2017-10-27 2018-06-29 佛山市顺德区美的电热电器制造有限公司 内胆组件以及液体加热器

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1162044C (zh) * 1999-05-04 2004-08-11 奥特控制有限公司 加热元件组件和液件加热容器
GB2386532A (en) * 2001-11-29 2003-09-17 Strix Ltd Electric water heater with reduced noise level
CN1915150A (zh) * 2005-08-18 2007-02-21 施特里克斯有限公司 电液体加热器
CN106993940A (zh) * 2016-01-22 2017-08-01 广东美的生活电器制造有限公司 液体加热容器
CN207341622U (zh) * 2017-04-28 2018-05-11 佛山市顺德区美的电热电器制造有限公司 电水壶
CN207341623U (zh) * 2017-04-28 2018-05-11 佛山市顺德区美的电热电器制造有限公司 电水壶
CN207095036U (zh) * 2017-08-29 2018-03-13 广东美的生活电器制造有限公司 内胆以及液体加热器
CN207555996U (zh) * 2017-10-27 2018-06-29 佛山市顺德区美的电热电器制造有限公司 内胆组件以及液体加热器

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