WO2017097643A1 - A silently operating liquid heating device - Google Patents

A silently operating liquid heating device Download PDF

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Publication number
WO2017097643A1
WO2017097643A1 PCT/EP2016/079193 EP2016079193W WO2017097643A1 WO 2017097643 A1 WO2017097643 A1 WO 2017097643A1 EP 2016079193 W EP2016079193 W EP 2016079193W WO 2017097643 A1 WO2017097643 A1 WO 2017097643A1
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Prior art keywords
liquid
limit
temperature
rotational speed
container
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Ceased
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PCT/EP2016/079193
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French (fr)
Inventor
Emirhan ERDIL
Furkan DENIZER
Baris KALE
Derya Hamarat
Aysun TUTAK EROZEN
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Arcelik AS
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Arcelik AS
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Publication of WO2017097643A1 publication Critical patent/WO2017097643A1/en
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    • 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
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools

Definitions

  • the present invention relates to a liquid heating device wherein the liquid is stirred.
  • the heating process generally takes place at the base of the container containing the liquid.
  • the liquid in the vicinity of the base of the container is heated faster and the temperature decreases gradually from the base upward and a temperature difference occurs in the vertical direction within the liquid.
  • the base of the container is heated up excessively before the liquid contained in the container has not yet boiled throughout, regional evaporations are observed on the base.
  • the liquid evaporating on the base rises upward in tiny bubbles because the density of the gas phase is lower. As the liquid bubbles in the gas phase rise, they come into contact with the colder liquid and burst, making noise.
  • the aim of the present invention is the realization of a liquid heating device that can be operated silently.
  • the liquid heating device realized in order to attain the aim of the present invention, explicated in the claims, comprises a control unit that enables the liquid therein to be stirred at a maximum first limit rotational speed until the temperature of the liquid reaches a first limit temperature predetermined by the producer and at a higher speed than the first limit rotational speed until the liquid increases from the first limit temperature to a second limit temperature predetermined by the producer.
  • the liquid heating device of the present invention the liquid rising in bubbles upon changing to the gas phase in the vicinity of the base of the container containing the liquid is prevented from meeting lower temperatures within the liquid and bursting, thus providing the silent operation of the liquid heating device.
  • the first limit temperature is inversely proportional to the power of the heater used in the heating of the liquid, and it is calculated as such and saved in the memory of the control unit.
  • the second limit temperature is directly proportional to the power of the heater used in the heating of the liquid, and it is calculated as such and saved in the memory of the control unit.
  • the liquid in the container when the temperature of the liquid in the container is between the first limit temperature and the second limit temperature, the liquid is stirred at a constant second limit rotational speed predetermined by the producer.
  • the temperature difference is eliminated and thereby total noise level is reduced by providing that the bubbles reach the surface without bursting, in other words, by providing that the bubbles are mixed into the liquid and disposed of before they burst.
  • the liquid in the container when the temperature of the liquid in the container is between the first limit temperature and the second limit temperature, the liquid is stirred at variable speeds that are higher than the first limit rotational speed. In this embodiment, the stirring speed is changed depending on the parameters that have an effect on the total noise level.
  • the liquid is stirred in the said temperature range at speeds starting with the first limit rotational speed and accelerating speeds toward a third limit rotational speed predetermined by the producer.
  • the liquid is stirred in the said temperature range first by accelerating from the first limit rotational speed to the third limit rotational speed and then stirred by slowing down the rotational speed from the third limit rotational speed and reducing the same to the first limit rotational speed.
  • the liquid s boiling point is approached, in other words, when the temperature difference within the liquid decreases and the temperature across the liquid comes to the same level, the bubbles formed by the liquid changing to the gas phase can reach the surface without bursting.
  • the stirring means that performs the stirring process is prevented from increasing the total noise level.
  • the first limit rotational speed is a speed between zero and two hundred and fifty revolutions per minute.
  • the producer has obtained the said rotational speeds as the speeds that do not increase the total noise level and the determined rotational speeds are saved in the memory of the control unit.
  • the second limit rotational speed is a speed between two hundred fifty and five hundred revolutions per minute.
  • the third limit rotational speed is a speed between two hundred fifty and five hundred revolutions per minute.
  • the first limit temperature is a temperature between 30 and 60 °C
  • the second limit temperature is a temperature between 80 and 100 °C.
  • the said temperatures are the beginning and ending points of the temperature ranges obtained by the producer as a result of experiments, within which the liquid heating device emits noise which is different from the levels of noise that can be considered silent.
  • the liquid heating device of the present invention a more silent liquid heating process compared with such samples that do not perform stirring or that continuously perform stirring at a constant speed in the state of the art is realized.
  • the silent stirring process is realized by preventing bursting of the bubbles due to the temperature difference across the liquid before they reach the surface and by preventing the stirring means from making extra noise by stirring at low speeds at low temperatures where there is no bubble formation and at high temperatures where the bubbles reach the surface.
  • Figure 1 - is the schematic view of a liquid heating device.
  • the liquid heating device (1) comprises a body (2), a container (3) that is disposed in the body (2) and wherein the water to be heated is filled, a heater (4) that provides the heating of the container (3), and a stirring means (5) that provides the stirring of the water inside the container (3).
  • the liquid heating device (1) of the present invention comprises a control unit (6) that by controlling the stirring means (5) enables the liquid in the container (3) to be stirred at a first limit rotational speed (R1) at most until the liquid reaches a predetermined first limit temperature (T1) and at a speed which is greater than the first limit rotational speed (R1) when the temperature of the liquid is between the first limit temperature (T1) and a second limit temperature (T2) which is greater than the first limit temperature (T1).
  • a control unit (6) that by controlling the stirring means (5) enables the liquid in the container (3) to be stirred at a first limit rotational speed (R1) at most until the liquid reaches a predetermined first limit temperature (T1) and at a speed which is greater than the first limit rotational speed (R1) when the temperature of the liquid is between the first limit temperature (T1) and a second limit temperature (T2) which is greater than the first limit temperature (T1).
  • the stirring means (5) is not operated or is operated at low speed, in other words, by stirring the liquid at the first limit rotational speed (R1) at most, the stirring means (5) is prevented from making extra noise.
  • the temperature of the liquid in the container (3) increasing, in other words, with the temperature exceeding the first limit temperature (T1), the liquid in the vicinity of the base of the container (3) begins to change to the gas phase and the liquid changing to the gas phase begins to rise in bubbles.
  • the temperature difference across the liquid is decreased and the bubbles are enabled to reach the surface without bursting.
  • the total noise level of the liquid heating device (1) is reduced.
  • the expression of the temperature of the liquid inside the container (3) is the mean temperature of the liquid, and the temperature of the liquid in the vicinity of the base of the container (3) is higher than the temperature of the liquid and the temperature of the liquid in the vicinity of the surface is lower than the temperature of the liquid.
  • the temperature of the liquid can be measured by any temperature sensor as well as calculated by means of the data received from a thermostat under the base of the container (3).
  • the first limit temperatures (T1) determined as inversely proportional to the power of the heater (4) are saved in the memory of the control unit (6).
  • the power of the heater (4) is high, the base of the container (3) heats up faster and bursting of the liquid bubbles occurs at lower liquid temperatures. Therefore, the value of the first limit temperature (T1) is kept low in the liquid heating devices (1) having a high power heater (4).
  • the first limit temperature (T1) is 55°C
  • the first limit temperature (T1) is 35°C.
  • the second limit temperatures (T2) determined as directly proportional to the power of the heater (4) are saved in the memory of the control unit (6).
  • T2 the second limit temperatures
  • the second limit temperature (T2) is 80°C
  • the second limit temperature (T2) is 95°C.
  • the control unit (6) when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred at a predetermined constant second limit rotational speed (R2) which is greater than the first limit rotational speed (R1).
  • the liquid is stirred at higher speeds such that the temperature difference is reduced and it is provided that the liquid bubbles in gas phase which multiply with the increasing of the temperature of the liquid inside the container (3) reach the surface of the liquid without bursting.
  • the control unit (6) when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred at variable speeds which are higher than the predetermined first limit rotational speed (R1). For example, the rotational speed rises by increasing in proportion to the temperature of the liquid inside the container (3).
  • the control unit (6) when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred at such speeds increasing from the first limit rotational speed (R1) toward a predetermined third limit rotational speed (R3) which is higher than the first limit rotational speed (R1).
  • R1 first limit rotational speed
  • R3 third limit rotational speed
  • the temperature difference between the liquid in the vicinity of the base of the container (3) and the liquid in upper parts increases as well.
  • the control unit (6) when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred first at speeds increasing from the first limit rotational speed (R1) toward the third limit rotational speed (R3) and then at speeds decreasing from the third limit rotational speed (R3) toward the first limit rotational speed (R1).
  • the liquid inside the container (3) is close to boiling, most of the liquid in the vicinity of the base of the container (3) changes to gas phase. In this case, as the liquid comes close the boiling point, the level of noise produced by the liquid heating device (1) decreases.
  • the rotational speed of the stirring means (5) is first increased and then as the liquid comes close to boiling, the rotational speed is reduced.
  • the noise produced by the stirring means (5) itself is prevented from increasing the total noise level.
  • the first limit rotational speed (R1) is a speed between zero and two hundred fifty revolutions per minute (rpm).
  • the second limit rotational speed (R2) is a speed between two hundred fifty and five hundred revolutions per minute (rpm).
  • the rotational speeds required to suppress the noise produced by the bubbles that changed to gas phase and burst are determined as a result of the experiments carried out by the producer.
  • the liquid is required to be stirred between the first limit temperature (T1) and the second limit temperature (T2) at a speed of 250 to 500 revolutions per minute.
  • the stirring means (5) produces a noise at a level greater than the noise emitted by the bursting bubbles.
  • the third limit rotational speed (R3) is a speed between two hundred fifty and five hundred revolutions per minute (rpm). Also in the embodiments where the liquid is stirred at varying speeds, the liquid must be stirred at the speeds mentioned in the above embodiment.
  • the first limit temperature (T1) is a temperature between 30 and 60°C.
  • the temperature where the bursting bubbles emit noise at a noticeable level varies.
  • the values determined by the producer as a result of the experiments are between 30 and 60°C.
  • the second limit temperature (T2) is a temperature between 80 and 100°C.
  • the temperature at which the noise comes out/occurs at a noticeable level due to the temperature difference during heating of the liquid varies.
  • the values determined by the producer as a result of the experiments for the second limit temperature (T2) are between 80 and 100°C.
  • the stirring means (5) comprises a blade rotating as attached to a shaft.
  • the shaft can be disposed at the base of the container (3) as well as on the lid (not shown in the figures) that closes the container (3).
  • the stirring means (5) comprises a motor (not shown in the figures) disposed under the base of the container (3) that can create a rotating magnetic field and a magnetic element (not shown in the figures) that is placed inside the container (3) and that rotates by means of the rotating magnetic field applied by the motor, thus providing stirring of the liquid inside the container (3).
  • the container (3) is coated with a hydrophobic material.
  • the liquid in the vicinity of the base of the container (3) is enabled to change to gas phase easily and the noise level is reduced.
  • the container (3) is coated with polytetrafluoroethylene.
  • the stirring means (5) by not stirring or stirring at low speeds the liquid before the occurrence of changing to gas phase in the liquid heating process, the stirring means (5) is prevented from contributing to the total noise level and by stirring the liquid at higher speeds as the liquid begins to change to gas phase, homogenous heating of the liquid is provided and by thus the bubbles changing to gas phase are prevented from making noise by bursting. In sum, by stirring the liquid at varying speeds, the stirring means (5) is prevented from raising the total noise level.

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  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
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Abstract

The present invention relates to a liquid heating device (1 ) comprising a body (2), a container (3) that is disposed in the body (2) and wherein the water to be heated is filled, a heater (4) that provides the heating of the container (3), and a stirring means (5) that provides the stirring of the water inside the container (3).

Description

A SILENTLY OPERATING LIQUID HEATING DEVICE
The present invention relates to a liquid heating device wherein the liquid is stirred.
In liquid heating devices, especially in water heaters used for boiling water, the heating process generally takes place at the base of the container containing the liquid. In this case, the liquid in the vicinity of the base of the container is heated faster and the temperature decreases gradually from the base upward and a temperature difference occurs in the vertical direction within the liquid. For the reason that the base of the container is heated up excessively before the liquid contained in the container has not yet boiled throughout, regional evaporations are observed on the base. The liquid evaporating on the base rises upward in tiny bubbles because the density of the gas phase is lower. As the liquid bubbles in the gas phase rise, they come into contact with the colder liquid and burst, making noise. In the state of the art stirring of the liquid by stirrers disposed inside the container as a solution to this problem is known. By stirring the liquid, the temperature difference throughout the liquid decreases and it is tried to prevent the bursting of the liquid bubbles and reduce the noise level. However, the liquid heating devices with the said stirrers cannot still operate completely silently.
In the state of the art British Patent Application No. GB2445070, a water heater having a stirrer is disclosed.
In the state of the art Chinese Patent Application No. CN103815785, a water heater having a stirrer is disclosed.
The aim of the present invention is the realization of a liquid heating device that can be operated silently.
The liquid heating device realized in order to attain the aim of the present invention, explicated in the claims, comprises a control unit that enables the liquid therein to be stirred at a maximum first limit rotational speed until the temperature of the liquid reaches a first limit temperature predetermined by the producer and at a higher speed than the first limit rotational speed until the liquid increases from the first limit temperature to a second limit temperature predetermined by the producer. In the liquid heating device of the present invention, the liquid rising in bubbles upon changing to the gas phase in the vicinity of the base of the container containing the liquid is prevented from meeting lower temperatures within the liquid and bursting, thus providing the silent operation of the liquid heating device.
In an embodiment of the present invention, it has been found as a result of the experiments carried out by the producer that the first limit temperature is inversely proportional to the power of the heater used in the heating of the liquid, and it is calculated as such and saved in the memory of the control unit.
In an embodiment of the present invention, it has been found as a result of the experiments carried out by the producer that the second limit temperature is directly proportional to the power of the heater used in the heating of the liquid, and it is calculated as such and saved in the memory of the control unit.
In another embodiment of the present invention, when the temperature of the liquid in the container is between the first limit temperature and the second limit temperature, the liquid is stirred at a constant second limit rotational speed predetermined by the producer. By stirring the liquid in the container at a constant speed, the temperature difference is eliminated and thereby total noise level is reduced by providing that the bubbles reach the surface without bursting, in other words, by providing that the bubbles are mixed into the liquid and disposed of before they burst.
In another embodiment of the present invention, when the temperature of the liquid in the container is between the first limit temperature and the second limit temperature, the liquid is stirred at variable speeds that are higher than the first limit rotational speed. In this embodiment, the stirring speed is changed depending on the parameters that have an effect on the total noise level.
In a version of this embodiment, the liquid is stirred in the said temperature range at speeds starting with the first limit rotational speed and accelerating speeds toward a third limit rotational speed predetermined by the producer. By means of the rotational speed increased in parallel with the increasing amount of the liquid changing to the gas phase, the total noise level is reduced.
In another version of this embodiment, the liquid is stirred in the said temperature range first by accelerating from the first limit rotational speed to the third limit rotational speed and then stirred by slowing down the rotational speed from the third limit rotational speed and reducing the same to the first limit rotational speed. When the liquid’s boiling point is approached, in other words, when the temperature difference within the liquid decreases and the temperature across the liquid comes to the same level, the bubbles formed by the liquid changing to the gas phase can reach the surface without bursting. In this case, by reducing the rotational speed over the time, the stirring means that performs the stirring process is prevented from increasing the total noise level.
In another embodiment of the present invention, the first limit rotational speed is a speed between zero and two hundred and fifty revolutions per minute. As a result of the experiments carried out by the producer, the producer has obtained the said rotational speeds as the speeds that do not increase the total noise level and the determined rotational speeds are saved in the memory of the control unit. In another embodiment of the present invention, the second limit rotational speed is a speed between two hundred fifty and five hundred revolutions per minute. In another embodiment of the present invention, the third limit rotational speed is a speed between two hundred fifty and five hundred revolutions per minute.
In another embodiment of the present invention, the first limit temperature is a temperature between 30 and 60 °C, in another embodiment of the present invention, the second limit temperature is a temperature between 80 and 100 °C. The said temperatures are the beginning and ending points of the temperature ranges obtained by the producer as a result of experiments, within which the liquid heating device emits noise which is different from the levels of noise that can be considered silent.
In the liquid heating device of the present invention, a more silent liquid heating process compared with such samples that do not perform stirring or that continuously perform stirring at a constant speed in the state of the art is realized. The silent stirring process is realized by preventing bursting of the bubbles due to the temperature difference across the liquid before they reach the surface and by preventing the stirring means from making extra noise by stirring at low speeds at low temperatures where there is no bubble formation and at high temperatures where the bubbles reach the surface.
The liquid heating device realized in order to attain the aim of the present invention is illustrated in the attached figures where
Figure 1 - is the schematic view of a liquid heating device.
The elements illustrated in the figures and the steps are numbered as follows:
  1. Liquid heating device
  2. Body
  3. Container
  4. Heater
  5. Stirring means
  6. Control unit
T1. First limit temperature
T2. Second limit temperature
R1. First limit rotational speed
R2. Second limit rotational speed
R3. Third limit rotational speed
The liquid heating device (1) comprises a body (2), a container (3) that is disposed in the body (2) and wherein the water to be heated is filled, a heater (4) that provides the heating of the container (3), and a stirring means (5) that provides the stirring of the water inside the container (3).
The liquid heating device (1) of the present invention comprises a control unit (6) that by controlling the stirring means (5) enables the liquid in the container (3) to be stirred at a first limit rotational speed (R1) at most until the liquid reaches a predetermined first limit temperature (T1) and at a speed which is greater than the first limit rotational speed (R1) when the temperature of the liquid is between the first limit temperature (T1) and a second limit temperature (T2) which is greater than the first limit temperature (T1).
In the liquid heating device (1) of the present invention, changing to the gas phase does not occur in the vicinity of the base of the container (3) until the liquid inside the container (3) reaches the first limit temperature (T1) and the total noise level of the liquid heating device (1) is low. Within this period, the stirring means (5) is not operated or is operated at low speed, in other words, by stirring the liquid at the first limit rotational speed (R1) at most, the stirring means (5) is prevented from making extra noise. With the temperature of the liquid in the container (3) increasing, in other words, with the temperature exceeding the first limit temperature (T1), the liquid in the vicinity of the base of the container (3) begins to change to the gas phase and the liquid changing to the gas phase begins to rise in bubbles. From the temperature where bubbles are forming on, in other words, from the first limit temperature (T1) on, with the stirring means (5) being stirred by increasing the rotational speed, in other words, at a speed higher than the first limit rotational speed (R1), the temperature difference across the liquid is decreased and the bubbles are enabled to reach the surface without bursting. Thus, the total noise level of the liquid heating device (1) is reduced. What is meant by the expression of the temperature of the liquid inside the container (3) is the mean temperature of the liquid, and the temperature of the liquid in the vicinity of the base of the container (3) is higher than the temperature of the liquid and the temperature of the liquid in the vicinity of the surface is lower than the temperature of the liquid. The temperature of the liquid can be measured by any temperature sensor as well as calculated by means of the data received from a thermostat under the base of the container (3).
In an embodiment of the present invention, the first limit temperatures (T1) determined as inversely proportional to the power of the heater (4) are saved in the memory of the control unit (6). When the power of the heater (4) is high, the base of the container (3) heats up faster and bursting of the liquid bubbles occurs at lower liquid temperatures. Therefore, the value of the first limit temperature (T1) is kept low in the liquid heating devices (1) having a high power heater (4). For example, in a liquid heating device (1) having a 1500W heater (4), the first limit temperature (T1) is 55°C, while in a liquid heating device (1) having a 1800W heater (4), the first limit temperature (T1) is 35°C. By means of this embodiment, the same control unit (6) can be used in liquid heating devices (1) having different heaters (4). Thus, cost advantage is provided in the production of the liquid heating devices (1) in different types.
In another embodiment of the present invention, the second limit temperatures (T2) determined as directly proportional to the power of the heater (4) are saved in the memory of the control unit (6). When a high power heater (4) is used, the temperature difference in the vertical direction across the liquid in the container (3) is higher when compared with the case with the low power heater (4). In other words, with the low power heaters (4), the liquid inside the container (3) is heated more homogenously. Therefore, when low power heaters (4) are used, stirring of the liquid when it is close to boiling is no longer necessary. For example, in a liquid heating device (1) having a 1500W heater (4), the second limit temperature (T2) is 80°C, while in a liquid heating device (1) having a 1800W heater (4), the second limit temperature (T2) is 95°C. By means of this embodiment, the same control unit (6) can be used in liquid heating devices (1) having different heaters (4). Consequently, cost advantage is provided in the production of the liquid heating devices (1) in different types.
In another embodiment of the present invention, when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred at a predetermined constant second limit rotational speed (R2) which is greater than the first limit rotational speed (R1). In this embodiment, the liquid is stirred at higher speeds such that the temperature difference is reduced and it is provided that the liquid bubbles in gas phase which multiply with the increasing of the temperature of the liquid inside the container (3) reach the surface of the liquid without bursting.
In another embodiment of the present invention, when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred at variable speeds which are higher than the predetermined first limit rotational speed (R1). For example, the rotational speed rises by increasing in proportion to the temperature of the liquid inside the container (3).
In another embodiment of the present invention, when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred at such speeds increasing from the first limit rotational speed (R1) toward a predetermined third limit rotational speed (R3) which is higher than the first limit rotational speed (R1). As the liquid inside the container (3) heats up, the temperature difference between the liquid in the vicinity of the base of the container (3) and the liquid in upper parts increases as well. By means of this embodiment, as the temperature of the liquid increases, the rotational speed of the stirring means (5) is increased and thereby bursting of the liquid bubbles in gas phase is prevented.
In another embodiment of the present invention, when the temperature of the liquid inside the container (3) is between the first limit temperature (T1) and the second limit temperature (T2), the control unit (6) enables the liquid to be stirred first at speeds increasing from the first limit rotational speed (R1) toward the third limit rotational speed (R3) and then at speeds decreasing from the third limit rotational speed (R3) toward the first limit rotational speed (R1). When the liquid inside the container (3) is close to boiling, most of the liquid in the vicinity of the base of the container (3) changes to gas phase. In this case, as the liquid comes close the boiling point, the level of noise produced by the liquid heating device (1) decreases. In parallel with the level of noise produced by the liquid heating device (1), the rotational speed of the stirring means (5) is first increased and then as the liquid comes close to boiling, the rotational speed is reduced. By changing the rotational speed of the stirring means (5) in parallel with the noise produced by the liquid heating device (1) in the state where the liquid is not stirred, the noise produced by the stirring means (5) itself is prevented from increasing the total noise level.
In another embodiment of the present invention, the first limit rotational speed (R1) is a speed between zero and two hundred fifty revolutions per minute (rpm). At the beginning of the liquid heating process, in other words, before the liquid in the vicinity of the base of the container (3) has not yet begun to change to gas phase, the liquid is stirred at low speeds. Thus, the noise produced by the stirring means (5) itself is prevented from increasing the total noise level.
In another embodiment of the present invention, the second limit rotational speed (R2) is a speed between two hundred fifty and five hundred revolutions per minute (rpm). The rotational speeds required to suppress the noise produced by the bubbles that changed to gas phase and burst are determined as a result of the experiments carried out by the producer. In order to provide effective noise elimination, the liquid is required to be stirred between the first limit temperature (T1) and the second limit temperature (T2) at a speed of 250 to 500 revolutions per minute. At speeds higher than 500 revolutions per minute, the stirring means (5) produces a noise at a level greater than the noise emitted by the bursting bubbles.
In another embodiment of the present invention, the third limit rotational speed (R3) is a speed between two hundred fifty and five hundred revolutions per minute (rpm). Also in the embodiments where the liquid is stirred at varying speeds, the liquid must be stirred at the speeds mentioned in the above embodiment.
In another embodiment of the present invention, the first limit temperature (T1) is a temperature between 30 and 60°C. Depending on the power of the heater (4), the temperature where the bursting bubbles emit noise at a noticeable level varies. The values determined by the producer as a result of the experiments are between 30 and 60°C.
In another embodiment of the present invention, the second limit temperature (T2) is a temperature between 80 and 100°C. Depending on the power of the heater (4), the temperature at which the noise comes out/occurs at a noticeable level due to the temperature difference during heating of the liquid varies. The values determined by the producer as a result of the experiments for the second limit temperature (T2) are between 80 and 100°C.
In another embodiment of the present invention, the stirring means (5) comprises a blade rotating as attached to a shaft. The shaft can be disposed at the base of the container (3) as well as on the lid (not shown in the figures) that closes the container (3).
In another embodiment of the present invention, the stirring means (5) comprises a motor (not shown in the figures) disposed under the base of the container (3) that can create a rotating magnetic field and a magnetic element (not shown in the figures) that is placed inside the container (3) and that rotates by means of the rotating magnetic field applied by the motor, thus providing stirring of the liquid inside the container (3).
In another embodiment of the present invention, the container (3) is coated with a hydrophobic material. Thus, the liquid in the vicinity of the base of the container (3) is enabled to change to gas phase easily and the noise level is reduced.
In another embodiment of the present invention, the container (3) is coated with polytetrafluoroethylene. By providing that the liquid in the vicinity of the base of the container (3) changes in greater volumes to gas phase by reducing the friction of the base of the container (3), the bubbles are prevented from bursting and the noise level is reduced.
In the liquid heating device (1) of the present invention, by not stirring or stirring at low speeds the liquid before the occurrence of changing to gas phase in the liquid heating process, the stirring means (5) is prevented from contributing to the total noise level and by stirring the liquid at higher speeds as the liquid begins to change to gas phase, homogenous heating of the liquid is provided and by thus the bubbles changing to gas phase are prevented from making noise by bursting. In sum, by stirring the liquid at varying speeds, the stirring means (5) is prevented from raising the total noise level.

Claims (12)

  1. A liquid heating device (1) comprising a body (2), a container (3) that is disposed in the body (2) and wherein the liquid to be heated is filled, a heater (4) that provides the heating of the container (3), and a stirring means (5) that provides the stirring of the water inside the container (3), characterized by a control unit (6) that by controlling the stirring means (5) enables the liquid in the container (3) to be stirred at a first limit rotational speed (R1) at most until the liquid reaches a predetermined first limit temperature (T1) and at a speed which is greater than the first limit rotational speed (R1) when the temperature of the liquid is between the first limit temperature (T1) and a second limit temperature (T2) which is greater than the first limit temperature (T1).
  2. A liquid heating device (1) as in Claim 1, characterized by the control unit (6) in the memory of which the first limit temperatures (T1) determined as inversely proportional to the power of the heater (4) are saved.
  3. A liquid heating device (1) as in any one of the above claims, characterized by the control unit (6) in the memory of which the second limit temperatures (T2) determined as directly proportional to the power of the heater (4) are saved.
  4. A liquid heating device (1) as in any of the claims 1 to 3, characterized by the control unit (6) that enables the liquid inside the container (3) to be stirred at a predetermined constant second limit rotational speed (R2) when the temperature of the liquid is between the first limit temperature (T1) and the second limit temperature (T2).
  5. A liquid heating device (1) as in any of the claims 1 to 3, characterized by the control unit (6) that enables the liquid inside the container (3) to be stirred at predetermined varying speeds when the temperature of the liquid is between the first limit temperature (T1) and the second limit temperature (T2).
  6. A liquid heating device (1) as in Claim 5, characterized by the control unit (7) that enables the liquid inside the container (3) to be stirred at speeds increasing from the first limit rotational speed (R1) to a predetermined third limit rotational speed (R3) when the temperature of the liquid is between the first limit temperature (T1) and the second limit temperature (T2).
  7. A liquid heating device (1) as in Claim 5, characterized by the control unit (6) that enables the liquid inside the container (3) to be stirred first at speeds increasing from the first limit rotational speed (R1) toward the third limit rotational speed (R3) and then at speeds decreasing from the third limit rotational speed (R3) toward the first limit rotational speed (R1).
  8. A liquid heating device (1) as in any one of the above claims, characterized by the first rotational speed (R1) which is between 0 and 250 revolutions per minute.
  9. A liquid heating device (1) as in Claim 4, characterized by the second rotational speed (R2) which is between 250 and 500 revolutions per minute.
  10. A liquid heating device (1) as in Claim 6 or 7, characterized by the third rotational speed (R3) which is between 250 and 500 revolutions per minute.
  11. A liquid heating device (1) as in any one of the above claims, characterized by the first limit temperature (T1) which is between 30 and 60°C.
  12. A liquid heating device (1) as in any of the above claims, characterized by the second limit temperature (T2) which is between 80 and 100°C.
PCT/EP2016/079193 2015-12-08 2016-11-30 A silently operating liquid heating device Ceased WO2017097643A1 (en)

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TR201515669 2015-12-08
TRA2015/15669 2015-12-08

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3510905A1 (en) * 2018-01-16 2019-07-17 Kenwood Limited Heating assembly
CN110037532A (en) * 2018-01-16 2019-07-23 凯伍德有限公司 Heating component
CN111227639A (en) * 2020-03-25 2020-06-05 胡国锋 High-efficient scale prevention insulating pot
CN114052488A (en) * 2021-12-15 2022-02-18 深圳市瀚索科技开发有限公司 Silent constant-temperature heating method and system and container using same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2445070A (en) 2006-12-14 2008-06-25 Otter Controls Ltd Noise reduction in electric water-heating vessels
CN202891694U (en) * 2012-09-27 2013-04-24 广州市拓璞电器发展有限公司 Intelligent milk frother
CN103815785A (en) 2012-11-19 2014-05-28 广州市拓璞电器发展有限公司 Water boiling device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2445070A (en) 2006-12-14 2008-06-25 Otter Controls Ltd Noise reduction in electric water-heating vessels
CN202891694U (en) * 2012-09-27 2013-04-24 广州市拓璞电器发展有限公司 Intelligent milk frother
CN103815785A (en) 2012-11-19 2014-05-28 广州市拓璞电器发展有限公司 Water boiling device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3510905A1 (en) * 2018-01-16 2019-07-17 Kenwood Limited Heating assembly
CN110037532A (en) * 2018-01-16 2019-07-23 凯伍德有限公司 Heating component
CN111227639A (en) * 2020-03-25 2020-06-05 胡国锋 High-efficient scale prevention insulating pot
CN111227639B (en) * 2020-03-25 2021-04-30 德清博发智能科技有限公司 High-efficient scale prevention insulating pot
CN114052488A (en) * 2021-12-15 2022-02-18 深圳市瀚索科技开发有限公司 Silent constant-temperature heating method and system and container using same

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