CN113188250A - Heating device, electric water heater and control method - Google Patents

Abstract

The application relates to a heating device, an electric water heater and a control method. The heating device includes: the temperature sensing device comprises a heat conducting plate, a temperature sensing device and a control circuit, wherein the heat conducting plate is provided with a first mounting hole and a second mounting hole; and the heating tube penetrates through the first mounting hole and is tightly connected with the first mounting hole. This application is transmitted the operating temperature of heating tube to the temperature sensing device in real time through setting up the heat-conducting plate, can make the temperature sensing device in time perceive the actual operating temperature of heating tube to in time cut off being connected of heating tube and power, thereby avoid the heating tube electric leakage that the long-time high temperature during operation of heating tube explosion arouses, and then avoided the emergence of incident.

Description

Heating device, electric water heater and control method

Technical Field

The application relates to the technical field of household appliances, in particular to a heating device, an electric water heater and a control method.

Background

Along with the improvement of living standard of people, the use of water heater is also more and more extensive. The electric water heater has low requirements on installation conditions, can be used only by electrifying, and is widely used by users.

Specifically, the heating device is a core device of the electric water heater, the service life of the electric water heater is greatly influenced by dry burning, and the heating device is easy to explode due to the dry burning, so that the electric leakage of the heating device is caused, and safety accidents are caused. The dry burning prevention function of the existing electric water heater is mainly that a temperature measuring pipe is additionally arranged in the electric water heater, a temperature sensing device is arranged in the temperature measuring pipe, once dry burning occurs, heat of the heating pipe can be transferred to the temperature measuring pipe through air, then the heat is transferred to the temperature sensing device through the temperature measuring pipe, and the power failure is controlled by the temperature sensing device. In this way, the temperature sensing device has a delay in sensing the working temperature, and still cannot avoid the pipe explosion of the heating device due to the overhigh working temperature, thereby causing safety accidents.

Disclosure of Invention

The heating device, the electric water heater and the control method have the technical effect of avoiding the pipe explosion of the heating device due to overhigh working temperature.

A heating device, comprising:

the temperature sensing device comprises a heat conducting plate, a temperature sensing device and a control circuit, wherein the heat conducting plate is provided with a first mounting hole and a second mounting hole, the first mounting hole penetrates through the heat conducting plate, and the second mounting hole is used for mounting the temperature sensing device; and

and the heating tube penetrates through the first mounting hole and is tightly connected with the first mounting hole.

In one embodiment, the heating tube is provided with a heating end and an electric connection end, the electric connection end is tightly connected to the first mounting hole, and the heating end extends away from the heat conducting plate.

In one embodiment, the temperature sensing device further comprises an insertion tube, the insertion tube is tightly inserted into the second installation hole, and the insertion tube is used for installing the temperature sensing device.

In one embodiment, the second mounting hole penetrates through the heat conducting plate, the second mounting hole is penetrated through at both axial ends of the insertion tube, one of the two axial ends of the insertion tube is an open end, the other end of the insertion tube is a closed end, the open end is configured to be located outside a water tank of the electric water heater, and the closed end is configured to be located inside the water tank.

In one embodiment, the heat conducting plate is mounted on the insulating seat, the heating tube penetrates through the insulating seat, and the insulating seat is provided with a first through hole communicated with the second mounting hole.

In one embodiment, a sealing ring is arranged on the insulating seat.

In one embodiment, an axial direction of the first mounting hole and an axial direction of the second mounting hole are arranged in parallel.

In addition, the embodiment of the application also provides an electric water heater, which comprises a water tank, a temperature sensing device and the heating device which is arranged on the water tank and is provided with the temperature sensing device according to any one of the embodiments, wherein the temperature sensing device is arranged in the second mounting hole.

In one embodiment, the temperature sensing device is a temperature controller, and the temperature controller controls the on-off of the heating tube and the power supply.

In one embodiment, the heating device further comprises a controller, the temperature sensing device is a temperature sensing bulb, the temperature sensing bulb is electrically connected with the controller, and the controller controls the on-off of the heating tube and the power supply according to a detection value of the temperature sensing bulb.

In addition, the application also provides a control method of the electric water heater, and the control method comprises the following steps:

acquiring a detection value of a temperature sensing bulb in real time, wherein the temperature sensing bulb is used for detecting the working temperature of a heating device in the electric water heater;

and when the detection value reaches the working temperature threshold value, cutting off the heating device and the power supply.

In one embodiment, after the step of obtaining the detection value of the thermal bulb in real time, the method further includes:

calculating the temperature rise rate of the detection value;

and judging the scaling degree of the heating device according to the temperature rise rate.

In one embodiment, the step of determining the degree of fouling of the heating device according to the temperature rise rate includes:

when the temperature rising rate does not exceed a first rate threshold, judging that the scaling degree of the heating device is not scaled;

when the temperature rising rate exceeds the first rate threshold and does not exceed a second rate threshold, judging that the scaling degree of the heating device is light scaling;

when the temperature rising rate exceeds the second rate threshold and does not exceed a third rate threshold, judging that the scaling degree of the heating device is moderate scaling;

when the temperature rise rate exceeds the third rate threshold and does not exceed a fourth rate threshold, judging that the scaling degree of the heating device is severe scaling;

wherein the first rate threshold, the second rate threshold, the third rate threshold, and the fourth rate threshold are sequentially incremented.

In one embodiment, after the step of calculating the temperature increase rate of the detection value, the method further includes:

and when the temperature rising rate exceeds a fifth rate threshold value, cutting off the heating device and the power supply.

Above-mentioned heating device, during actual operation, the operating temperature of heating tube can transmit to the temperature sensing device through the heat-conducting plate in real time to make the temperature sensing device can in time detect the operating temperature of heating tube. When the heating device is dried or scales are formed to cause the working temperature of the heating device to be overhigh, the temperature sensing device can timely detect the working temperature abnormity of the heating tube so as to timely cut off the connection between the heating tube and the power supply. Compared with the prior art, the working temperature of the heating tube is transmitted to the temperature sensing device in real time through the heat conducting plate, so that the temperature sensing device can timely sense the actual working temperature of the heating tube, the connection between the heating tube and a power supply is timely cut off, the electric leakage of the heating tube caused by tube explosion during long-time high-temperature working of the heating tube is avoided, and further the occurrence of safety accidents is avoided.

Drawings

FIG. 1 is a schematic structural diagram of a heating device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a heating device in another embodiment of the present application.

Description of reference numerals:

a heating device 10; a heat generating tube 11; a heating end 111; an electrical connection terminal 112; a heat-conducting plate 12; a cannula 13;

an insert sheet 14; an insulating base 15; .

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The heating device provided in the embodiment of the application is applied to hot water equipment, and the hot water equipment can be an electric water heater and can also be other equipment needing to be used for heating. The application does not limit the usage scenario of the heating device. The following description will take an electric water heater as an example to illustrate the beneficial effects of the heating device.

Referring to fig. 1 and 2, an embodiment of the present application provides a heating device 10, which includes a heat conducting plate 12, a heat generating tube 11 and an insertion tube 13. The heat conducting plate 12 has a first mounting hole and a second mounting hole, the first mounting hole penetrates through the heat conducting plate 12, the heating tube 11 is arranged in the first mounting hole in a penetrating manner and is tightly connected with the first mounting hole, and the second mounting hole is used for mounting the temperature sensing device.

In the heating device 10, during actual operation, the working temperature of the heating tube 11 can be transmitted to the temperature sensing device through the heat conducting plate 12 in real time, so that the temperature sensing device can detect the working temperature of the heating tube 11 in time. When the heating device 10 is heated up or scales are formed, the temperature sensing device can detect the abnormal working temperature of the heating tube 11 in time, so as to cut off the connection between the heating tube 11 and the power supply in time.

Compared with the prior art, the working temperature of the heating tube 11 is transmitted to the temperature sensing device in real time by arranging the heat conduction plate 12, so that the temperature sensing device can timely sense the actual working temperature of the heating tube 11, the connection between the heating tube 11 and a power supply is timely cut off, the electric leakage of the heating tube 11 caused by tube explosion during the long-time high-temperature working of the heating tube 11 is avoided, and the occurrence of safety accidents is further avoided.

In some embodiments, the heat generating tube 11 has a heating end 111 and an electrical end 112, the electrical end 112 of the heat generating tube 11 is closely attached to the first mounting hole, and the heating end 111 of the heat generating tube 11 extends away from the heat conducting plate 12. In actual use, the heat conducting plate 12 is connected to the electric connection end 112 of the heating tube 11 and mounted on the water tank, the heating end 111 of the heating tube 11 extends to the outside of the heat conducting plate 12 to be inserted into water to heat the water, and the heat conducting plate 12 may not be directly contacted with the water. Thus, the heat conducting plate 12 can directly measure the operating temperature of the heating tube 11 without being affected by the water temperature, which is helpful for the temperature sensing device to accurately measure the operating temperature of the heating tube 11. Of course, the possibility of placing the heat-conducting plate 12 in water is not excluded.

The heating tube 11 can generate heat over its entire area, and is not limited to the heating end 111.

Further, referring to fig. 1 and 2, the heating device 10 further includes an insertion sheet 14, the heating tube 11 includes a tube body and a heating wire disposed in the tube body, the insertion sheet 14 is inserted into the electric connection end 112 of the tube body and electrically connected to the heating wire, and the insertion sheet 14 is used for being connected to a power supply to supply power to the heating wire.

During actual operation, the inserted sheet 14 can insert the power supply line, and the power supply line passes through the relay and is connected with the power, can control the inserted sheet 14 during the relay break-make and get electric or cut off the power supply, can supply power to the heater when the inserted sheet 14 gets electric to make the heater generate heat. The heating wire that generates heat can make the operating temperature of pipe body rise for the pipe body can add hot water.

It will be appreciated that the insert 14 is made of an electrically conductive material, such as a copper sheet.

In some embodiments, referring to fig. 1 and 2, the heating device 10 further includes an insertion tube 13, and the insertion tube 13 is tightly inserted into the second mounting hole for mounting the temperature sensing device.

In actual operation, the heat conducting plate 12 can transmit the operating temperature of the heating tube 11 to the insertion tube 13 in real time, and the temperature sensing device senses the operating temperature of the heating tube 11 by sensing the operating temperature of the insertion tube 13. At this time, the temperature sensing device is installed through the insertion tube 13, and the temperature sensing device is relatively directly installed in the second installation hole, so that the accurate installation of the position of the temperature sensing device is convenient to guarantee.

In an embodiment, the second mounting hole penetrates through the heat conducting plate 12, the two axial ends of the insertion tube 13 are both penetrated through the second mounting hole, one of the two axial ends of the insertion tube 13 is an open end, the other end of the insertion tube is a closed end, the open end is configured to be located outside a water tank of the electric water heater, and the closed end is configured to be located inside the water tank. Specifically, when the heating device 10 includes the insulating base 15 described below, the closed end is the end away from the insulating base 15, and the open end is the end close to the insulating base 15.

In actual use, the temperature sensing device is arranged in the insertion pipe 13 from the opening end of the insertion pipe 13, the opening end of the insertion pipe 13 can be used for a line of the temperature sensing device to pass through, and the opening end is positioned outside the water tank at the moment, so that the water inlet problem can be eliminated. The closed end of the insertion tube 13 is positioned in the water tank, so that water (such as water vapor) can be prevented from entering the insertion tube 13 and damaging the temperature sensing device.

Wherein a closing plug can be provided at the closed end of the cannula 13, which can open or close the closed end. When the temperature sensing device is installed, the installation condition of the temperature sensing device can be observed by opening the sealing plug, the installation is ensured to be in place, and the sealing plug is installed at the sealing end after the installation is finished so as to realize the sealing effect and avoid the water from entering.

The number of the heating tubes 11 may be one or more, the number of the insertion tubes 13 may also be one or more, and correspondingly, the number of the first mounting holes and the number of the second mounting holes are multiple and are in one-to-one correspondence with the heating devices 10 and the insertion tubes 13, respectively. When the number of the insertion tubes 13 is multiple, a plurality of temperature sensing devices can be installed, and the actual working temperature of the heating tube 11 can be judged according to the average value of detection values of the plurality of temperature sensing devices, so that the working temperature measurement of the heating tube 11 is more accurate.

In the embodiment, the heating tube 11 is U-shaped, two ends of the U-shaped heating tube 11 are both electric terminals 112, and the bent portion of the U-shaped heating device 10 is a heating terminal 111. The insertion tube 13 may be disposed between the U-shaped heat generating tubes 11 or disposed outside the U-shaped heat generating tubes 11.

It will be appreciated that both insertion tube 13 and heat-conducting plate 12 are made of a heat-conducting material. Preferably, both insertion tube 13 and heat-conducting plate 12 are made of a metal material with high thermal conductivity, such as a copper alloy. Of course, insertion tube 13 and plate 12 can also be made of other highly heat-conductive materials, such as highly heat-conductive ceramic materials. And are not particularly limited herein.

In some embodiments, referring to fig. 1 and 2, the heating device 10 further includes an insulating base 15, the heat conducting plate 12 is mounted on the insulating base 15, the heat generating tube 11 penetrates through the insulating base 15, and the insulating base 15 has a first through hole communicated with the second mounting hole. In actual operation, the heating device 10 is installed on a water tank of the electric water heater through the insulating seat 15, the insulating seat 15 is made of insulating materials, safety accidents caused by electric leakage of the heating wire can be prevented, meanwhile, the heating tube 11 penetrates through the insulating seat 15 and the first through hole to be communicated with the second installation hole, the heating tube 11 and a circuit of the temperature sensing device can be installed after the insulating seat 15 is installed, and wiring is convenient.

It is understood that the insulating base 15 further has a second through hole communicated with the first mounting hole, the open end of the insertion tube 13 penetrates the insulating base 15 through the first through hole, and the electric connection end 112 of the heating tube 11 penetrates the insulating base 15 through the second through hole.

The insulating base 15 may be made of plastic (polyethylene, polyvinyl chloride, polypropylene, etc.), mica, impregnated fiber, etc.

In the embodiment, the insulating base 15 is connected to one side of the heat conducting plate 12, and the heating end 111 of the heating tube 11 is located on one side of the heat conducting plate 12 away from the insulating base 15. In this case, the insulating base 15 is provided only on one side of the heat transfer plate 12, and the material for the insulating base 15 can be reduced. Of course, in other embodiments, insulating seat 15 may be disposed to surround heat-conducting plate 12.

Further, a sealing ring is disposed on the insulating base 15. During actual installation, the sealing ring is connected to the joint of the insulating base 15 and the water tank, so as to effectively prevent water leakage at the joint of the insulating base 15 and the water tank.

In some embodiments, referring to fig. 1 and 2, the axial direction of the first mounting hole and the axial direction of the second mounting hole are arranged in parallel. At this time, the heating tube 11 is arranged in parallel with the insertion tube 13, so that the temperature sensing device and the heating tube 11 can be wired (power line or signal line) from one direction, thus facilitating the installation and use of the heating device 10.

Of course, the possibility of the arrangement of the first mounting hole in an axial direction intersecting the second mounting hole in an axial direction is not excluded.

The heating device 10 that provides in the embodiment of this application, through setting up heat-conducting plate 12 and transmit the operating temperature of heating tube 11 to the temperature sensing device in real time, can make the temperature sensing device in time perceive the actual operating temperature of heating tube 11 to in time cut off being connected of heating tube 11 and power, thereby avoid the heating tube 11 electric leakage that the long-time high temperature during operation of heating tube 11 explodes the pipe and arouses, and then avoided the emergence of incident.

In addition, the embodiment of the present application further provides an electric water heater, which includes a water tank, a temperature sensing device and the heating device 10 provided in any of the above embodiments mounted on the water tank, wherein the temperature sensing device is disposed in the insertion tube 13.

In the actual operation of the electric water heater, the working temperature of the heating tube 11 can be transmitted to the temperature sensing device in real time through the heat conducting plate 12, so that the temperature sensing device can detect the working temperature of the heating tube 11 in time. When the heating device 10 is heated up or scales are formed, the temperature sensing device can detect the abnormal working temperature of the heating tube 11 in time, so as to cut off the connection between the heating tube 11 and the power supply in time. Compared with the prior art, the working temperature of the heating tube 11 is transmitted to the temperature sensing device in real time by arranging the heat conduction plate 12, so that the temperature sensing device can timely sense the actual working temperature of the heating tube 11, the connection between the heating tube 11 and a power supply is timely cut off, the electric leakage of the heating tube 11 caused by tube explosion during the long-time high-temperature working of the heating tube 11 is avoided, and the occurrence of safety accidents is further avoided.

Optionally, the temperature sensing device is a temperature controller, and the temperature controller controls the on-off of the heating tube 11 and the power supply. In actual operation, the thermostat is a physical switch, and has a connection switch for connecting the heating tube 11 and the power supply, and when the working temperature of the heating tube 11 reaches the set value of the thermostat, the medium in the thermostat expands, so as to switch the connection switch in the thermostat. It should be noted that, since the temperature controller is only a physical switch, the specific operating temperature value of the heating tube 11 cannot be obtained in real time.

Preferably, the electric water heater further comprises a controller, the temperature sensing device is a temperature sensing bulb, the temperature sensing bulb is electrically connected with the controller, and the controller controls the on-off of the heating tube 11 and the power supply according to the detection value of the temperature sensing bulb.

In actual operation, after the working temperature of the heating tube 11 is detected by the temperature sensing bulb, the detected value is sent to the controller, the controller judges whether the working temperature of the heating tube 11 reaches a working temperature threshold value or not according to the detected value, when the working temperature threshold value is reached, the relay for connecting the heating tube 11 and the power supply is controlled to be powered off, so that the heating tube 11 and the power supply are cut off, and when the detected value is smaller than the working temperature threshold value, the relay is controlled to be powered on, so that the heating tube 11 and the power supply are switched on.

At this time, the controller can acquire the operating temperature change of the heating tube 11 in real time.

Further, the controller can also determine the degree of fouling of the heating apparatus 10 based on the temperature rise rate of the detected value. Specifically, when the temperature rising rate of the detection value does not exceed the first rate threshold value T1, it indicates that the heater in the heating device 10 is not fouled, when the temperature rising rate of the detection value is greater than T1 and does not exceed the second rate threshold value T2, it indicates that the heater is slightly fouled, when the temperature rising rate of the detection value is greater than T2 and does not exceed the third rate threshold value T3, it indicates that the heater is moderately fouled, and when the temperature rising rate of the detection value is greater than T3 and is less than the fourth rate threshold value T4, it indicates that the heater is heavily fouled. When the heater scale deposit, the operating temperature of heater itself is very high, but the heat can't effectively be transmitted away for the time extension that water was heated, so can make the heater be in high temperature state for a long time, and heating device 10 explodes the pipe easily and arouses the incident, and also energy-conserving moreover. And the working temperature of the heating tube 11 is obtained in real time through the detection value of the temperature sensing bulb, so that the scaling degree of the heating wire can be judged, and further the heating device 10 is prevented from being damaged due to serious scaling of the heating wire.

It is understood that the sizes of T1, T2, T3 and T4 are gradually increasing.

Further, the controller is also configured to cut off the heating device 10 from the power supply when the detected temperature rising rate exceeds a fifth rate threshold. At this time, the on/off of the heating device 10 and the power supply is controlled according to the temperature rising rate of the heating device 10, and when the temperature rising rate of the heating device 10 is abnormal, the heating device 10 and the power supply are cut off in time. Thus, when the temperature rising rate is abnormal but the working temperature does not reach the working temperature threshold, the heating device 10 can be found to be in an abnormal heating state, and the situation can be prevented.

The fifth rate threshold may be a third rate threshold, a fourth rate threshold, or another value, which is not limited in particular.

Further, the controller can also be used to provide information to the user on the degree of fouling of the heater to facilitate the user in replacing the heating apparatus 10 in a timely manner. The structural degree of the heating wire of the user can be informed when the temperature rise rate is abnormal, and the scaling degree of the heating wire of the user can be informed when the structural degree reaches the standard (such as the scaling degree is moderate scaling or above) for informing the user.

It will be appreciated that the electric water heater also includes other benefits of the heating device 10 described above, and will not be described in detail herein.

In addition, an embodiment of the present application further provides a control method of an electric water heater, where the control method includes:

s1, acquiring a detection value of a temperature sensing bulb in real time, wherein the temperature sensing bulb is used for detecting the working temperature of the heating device 10 in the electric water heater;

and S2, cutting off the heating device 10 and the power supply when the detected value reaches the working temperature threshold value, and judging the scaling degree of the heating device 10 according to the temperature rising rate of the detected value.

In this embodiment, the main executing body of the control method may be a controller of the electric water heater, and the controller is electrically connected to the thermal bulb and can control the on/off between the heating device 10 and the power supply. When the heating device 10 heats during operation, the operating temperature of the heating tube 11 can be transmitted to the thermal bulb through the heat conducting plate 12 in real time, so that the thermal bulb can detect the operating temperature of the heating tube 11 in time, and then the controller can acquire the detection value of the thermal bulb in real time and monitor the relation between the detection value of the thermal bulb and the temperature threshold value. When the detection value of the thermal bulb is smaller than the temperature threshold value, it indicates that the heating tube 11 is still in a normal heating state. When the detected value of the temperature sensing bulb reaches the temperature threshold value, which indicates that the temperature of the heating device 10 is abnormal, dry burning or abnormal heating (such as scaling) may occur, the controller controls the connection between the heating device 10 and the power supply to be cut off. Illustratively, the controller is electrically connected to a relay for controlling the on/off of the heating device 10 and the power supply, the controller controls the relay to be powered on and the heating device 10 to be connected to the power supply, and the controller controls the relay to be powered off and the heating device 10 to be disconnected from the power supply. Thus, when the working temperature of the heating device 10 is abnormal, the controller can be timely cut off to avoid the connection between the heating device 10 and the power supply, the leakage of the heating device 10 caused by tube explosion when the heating device 10 works at high temperature for a long time is avoided, and further the occurrence of safety accidents is avoided.

The electric water heater comprises a temperature sensing bulb, a water tank and the heating device 10 arranged on the water tank, wherein the temperature sensing bulb is arranged in a second mounting hole of the heating device 10. In this way, the thermal bulb can detect the operating temperature of the heating device 10 in time, so that the controller can switch the heating device 10 and the power supply even when the operating temperature of the heating device 10 is abnormal. Specifically, when the insertion tube 13 is disposed in the second mounting hole, the bulb is disposed in the insertion tube 13.

In some embodiments, the control method of the electric water heater further includes, after step S1, the steps of:

s3, calculating the temperature rising rate of the detection value;

and S4, judging the scaling degree of the heating device 10 according to the temperature rising rate.

In this embodiment, when the heater scale deposit, the operating temperature of heater itself is very high, but the heat can't effectively be transmitted away for the time extension that water was heated can make the heater be in high temperature state for a long time, and heating device 10 explodes the pipe easily and arouses the incident, and also energy-conserving moreover. And the scaling degree of the heating device 10 is judged according to the temperature rise rate of the detection value of the temperature sensing bulb, so that the problem of pipe explosion caused by overhigh temperature of the heating device 10 due to serious scaling of the heating device 10 is avoided, and the precaution can be realized.

In an embodiment, step S4 includes:

s41, when the temperature rising rate does not exceed a first rate threshold value, judging that the scaling degree of the heating device 10 is not scaling;

s42, when the temperature rising rate exceeds the first rate threshold value and does not exceed the second rate threshold value, judging that the scaling degree of the heating device 10 is light scaling;

s43, when the temperature rising rate exceeds the second rate threshold and does not exceed a third rate threshold, judging that the scaling degree of the heating device 10 is moderate scaling;

s44, when the temperature rising rate exceeds the third rate threshold and does not exceed a fourth rate threshold, judging that the scaling degree of the heating device 10 is severe scaling;

wherein the first rate threshold, the second rate threshold, the third rate threshold, and the fourth rate threshold are sequentially incremented.

In the present embodiment, when the temperature rising rate of the detection value does not exceed the first rate threshold T1, it indicates that the heater in the heating apparatus 10 is not fouled, when the temperature rising rate of the detection value is greater than T1 and does not exceed the second rate threshold T2, it indicates that the heater in the heating apparatus 10 is slightly fouled, when the temperature rising rate of the detection value is greater than T2 and does not exceed the third rate threshold T3, it indicates that the heater in the heating apparatus 10 is moderately fouled, and when the temperature rising rate of the detection value is greater than T3 and is less than the fourth rate threshold T4, it indicates that the heater in the heating apparatus 10 is heavily fouled. In this way, the degree of configuration of the heating device 10 can be determined from a comparison of the actual rate of temperature rise with the respective rate thresholds.

In some embodiments, after step S3, step S5 is further included:

and S5, cutting off the heating device (10) and the power supply when the temperature rising rate exceeds a fifth rate threshold value. In the present embodiment, the controller also controls the on/off of the heating device 10 and the power supply according to the temperature rising rate of the heating device 10. When the heating rate of the heating device 10 is abnormal, the controller can cut off the heating device 10 and the power supply in time. Thus, when the temperature rising rate is abnormal but the working temperature does not reach the working temperature threshold, the heating device 10 can be found to be in an abnormal heating state, and the situation can be prevented.

The fifth rate threshold may be a third rate threshold, a fourth rate threshold, or another value, which is not limited in particular.

Further, step S4 is followed by step S6: information on the degree of fouling of the heater is provided to the user. Thus, the user can know the scaling degree of the heating wire in time, so that the user can replace the heating device 10 in time. Specifically, when the heating device 10 is heavily fouled, the controller prompts the user to replace the heating device 10 to avoid a safety accident caused by the abnormal operation and tube explosion of the heating device 10. In addition, step S6 may also be executed after step S5, that is, information of the degree of fouling of the heating apparatus 10 is provided to the user to inform the user of the reason for switching the power supply while finding that the temperature increase rate is abnormal.

Alternatively, the controller calculates the temperature increase rate of the detection value in units of the first period. For example, the controller calculates the temperature rise rate of the detection value every five minutes. In addition, the temperature rising rate of the detection value can be calculated every second time length, for example, the temperature rising rate of the detection value is calculated every four minutes by the controller, so that the calculation times of the controller are reduced, and the hardware cost of the controller is reduced.

It will be appreciated that the controller comprises a processor and a memory, and the memory stores a computer program, and the processor, when running the computer, performs the control method in the above embodiments.

According to the control method of the electric water heater provided by the embodiment of the application, the working temperature of the heating device 10 is measured through the thermal bulb, when the working temperature of the heating device 10 is abnormal (including abnormal temperature caused by dry burning or abnormal temperature caused by scaling), the heating device 10 and the power supply can be automatically switched, and the scaling degree of the heating device 10 can be automatically judged so as to remind a user of replacing the heating device 10 in time. Compared with the prior art, the safety accident caused by pipe explosion due to overhigh temperature of the heating device 10 can be effectively avoided.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (14)

1. A heating device, comprising:

a heat-conducting plate (12) having a first mounting hole and a second mounting hole, the first mounting hole penetrating the heat-conducting plate (12), the second mounting hole being used for mounting a temperature sensing device; and

and the heating tube (11) penetrates through the first mounting hole and is tightly connected with the first mounting hole.

2. The heating device according to claim 1, wherein the heating tube (11) has a heating end (111) and an electrical connection end (112), the electrical connection end (112) being tightly connected to the first mounting hole, the heating end (111) extending away from the heat conducting plate (12).

3. The heating device according to claim 1, further comprising an insertion tube (13), wherein the insertion tube (13) is tightly inserted into the second mounting hole, and the insertion tube (13) is used for mounting the temperature sensing device.

4. The heating device according to claim 3, wherein the second mounting hole penetrates the heat conducting plate (12), the insertion tube (13) penetrates the second mounting hole at both axial ends, one of the two axial ends of the insertion tube (13) is an open end, the other end is a closed end, the open end is configured to be located outside a water tank of the electric water heater, and the closed end is configured to be located inside the water tank.

5. The heating device according to claim 1, further comprising an insulating base (15), wherein the heat conducting plate (12) is mounted on the insulating base (15), the heat generating tube (11) penetrates through the insulating base (15), and the insulating base (15) has a first through hole communicating with the second mounting hole.

6. A heating device according to claim 5, wherein a sealing ring is arranged on the insulating seat (15).

7. The heating device according to claim 1, wherein an axial direction of the first mounting hole and an axial direction of the second mounting hole are arranged in parallel.

8. An electric water heater comprising a water tank, a temperature sensing device and a heating device (10) according to any one of claims 1 to 7 mounted on the water tank, wherein the temperature sensing device is disposed in the second mounting hole.

9. The electric water heater according to claim 8, wherein the temperature sensing device is a temperature controller, and the temperature controller controls the on/off of the heating tube (11) and the power supply.

10. The electric water heater according to claim 8, further comprising a controller, wherein the temperature sensing device is a temperature sensing bulb, the temperature sensing bulb is electrically connected with the controller, and the controller controls the on-off of the heating tube (11) and the power supply according to a detection value of the temperature sensing bulb.

11. A control method of an electric water heater is characterized by comprising the following steps:

the method comprises the steps of obtaining a detection value of a temperature sensing bulb in real time, wherein the temperature sensing bulb is used for detecting the working temperature of a heating device (10) in the electric water heater;

and when the detection value reaches the working temperature threshold value, the heating device (10) and the power supply are cut off.

12. The control method according to claim 11, further comprising, after the step of acquiring in real time the detection value of the bulb:

calculating the temperature rise rate of the detection value;

and judging the scaling degree of the heating device (10) according to the temperature rising rate.

13. The control method according to claim 12, wherein the step of determining the degree of fouling of the heating device (10) from the ramp rate comprises:

when the temperature rising rate does not exceed a first rate threshold value, judging that the scaling degree of the heating device (10) is not scaled;

when the temperature rising rate exceeds the first rate threshold and does not exceed a second rate threshold, judging that the scaling degree of the heating device (10) is light scaling;

when the temperature rising rate exceeds the second rate threshold and does not exceed a third rate threshold, judging that the scaling degree of the heating device (10) is moderate scaling;

when the temperature rising rate exceeds the third rate threshold and does not exceed a fourth rate threshold, judging that the scaling degree of the heating device (10) is severe scaling;

wherein the first rate threshold, the second rate threshold, the third rate threshold, and the fourth rate threshold are sequentially incremented.

14. The control method according to claim 12, further comprising, after the step of calculating the temperature increase rate of the detection value:

and when the temperature rising rate exceeds a fifth rate threshold value, the heating device (10) is disconnected from the power supply.

Images