Liquid heating appliance with dry boil device fault detection function

Abstract

The present application relates to a kind of liquid heating equipment with dry burning device fault detection function, including heating container, dry burning prevention device, fault judging unit and controller, the dry burning prevention device and fault judging unit are electrically connected with controller, the fault judging unit is for detecting the working state of dry burning prevention device and judges whether dry burning prevention device fails;The dry burning prevention device includes the bottom liquid level sensor being arranged at the position near the bottom of liquid heating chamber, the top liquid level sensor being arranged at the position near the top of liquid heating chamber and the liquid supplementing device being connected with liquid supplementing port.In the present application, fault judging unit can find in time when dry burning prevention device fails, so as to provide safety protection when dry burning prevention device fails, reduce product quality problem caused by device failure, and at the same time, can significantly reduce or even eliminate the serious safety accidents such as scald, fire caused by liquid heating equipment due to liquid level sensor failure.

Description

Technical Field

[0001] This invention belongs to the field of liquid heater anti-dry burning technology, and relates to a liquid heating device with fault detection function for anti-dry burning devices. Background Technology

[0002] Liquid heating equipment is widely used in modern industry. Because the liquid in this equipment gradually evaporates during the heating process, it's necessary to add heating liquid when the liquid level is low to prevent dry burning. In existing technology, this type of equipment typically includes a liquid level sensor and a replenishment device. The liquid level sensor detects the liquid level and controls the replenishment device to add heating liquid to prevent dry burning. However, liquid level sensors and replenishment devices can sometimes malfunction. When these fail, it can lead to product quality issues and potentially cause serious safety accidents such as dry burning or fires. Therefore, it is necessary to detect potential malfunctions in the liquid level sensor and replenishment device. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a liquid heating device with a fault detection function for preventing dry burning of components.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A liquid heating device with a fault detection function for an anti-dry-burning device includes a heating container, an anti-dry-burning device, a fault judgment unit, and a controller. The heating container has a cavity comprising an upper condensing chamber and a lower liquid heating chamber. A condenser is disposed within the condensing chamber, and a condensing tray is disposed below the condenser at the junction of the liquid heating chamber and the condensing chamber. A groove is provided on the condensing tray, and a condensate collection port communicating with the groove is provided at the bottom of the condensing chamber. A heater is disposed at the bottom of the liquid heating chamber, and heating liquid is disposed within the liquid heating chamber. The heating chamber also has a replenishment port. The heater, the anti-dry-burning device, and the fault judgment unit are all electrically connected to the controller. The fault judgment unit is used to detect the operating status of the anti-dry-burning device and determine whether the anti-dry-burning device has malfunctioned.

[0006] The anti-dry-burning device includes a bottom liquid level sensor located near the bottom of the liquid heating chamber, a top liquid level sensor located near the top of the liquid heating chamber, and a liquid replenishment device connected to the replenishment port. The bottom liquid level sensor is located at a height higher than the heater. When the bottom liquid level sensor is in a no-signal state, the controller causes the heater to stop heating. The liquid replenishment device is used to replenish heating liquid to the liquid heating chamber through the replenishment port. The top liquid level sensor is in a no-signal state at the start of the liquid replenishment device replenishing the heating liquid, and the top liquid level sensor is in a signal state at the end of the liquid replenishment device replenishing the heating liquid.

[0007] Furthermore, the method by which the fault judgment unit detects whether the bottom liquid level sensor has malfunctioned includes: comparing the states of the top liquid level sensor and the bottom liquid level sensor; if the top liquid level sensor is in a signal state while the bottom liquid level sensor is in a no-signal state, then the bottom liquid level sensor is determined to have malfunctioned.

[0008] Furthermore, the method by which the fault determination unit detects whether the top liquid level sensor has malfunctioned includes:

[0009] S101. When the heater of the liquid heating equipment is working, detect whether the top liquid level sensor is in a signal state, and start timing when the top liquid level sensor is detected to be in a signal state.

[0010] S102. Determine whether the timing time for the top liquid level sensor to be in a signal state has reached or exceeded the preset first time threshold t1; if it has reached or exceeded the preset first time threshold t1, then execute step S105; otherwise, execute step S103.

[0011] S103. Determine whether the top liquid level sensor has changed from a signal state to a no-signal state; if it has changed to a no-signal state, proceed to step S104; otherwise, return to step S102.

[0012] S104. Reset the timing of the top liquid level sensor when it is in a signal state to zero, and return to execute step S101.

[0013] S105, The top liquid level sensor is determined to be faulty.

[0014] Furthermore, the first time threshold t1 is greater than the time required for the liquid level of the heating liquid to drop from the highest liquid level to the position of the top liquid level sensor when the heater is continuously heating, plus the time interval between the moment the top liquid level sensor detects the heating liquid and the moment the replenishing device stops replenishing the heating liquid; and the first time threshold t1 is less than the time required for the liquid level of the heating liquid to drop from the position of the top liquid level sensor to the position of the bottom liquid level sensor when the heater is continuously heating.

[0015] Furthermore, the method by which the fault judgment unit detects whether the top liquid level sensor or the liquid replenishment device has malfunctioned includes:

[0016] S111. When the heater of the liquid heating equipment is working, detect whether the top liquid level sensor is in a no-signal state, and start timing when the top liquid level sensor is detected to be in a no-signal state.

[0017] S112. Determine whether the timing of the top liquid level sensor being in a no-signal state has reached or exceeded the preset second time threshold t2; if it has reached or exceeded the preset second time threshold t2, then execute step S115; otherwise, execute step S113.

[0018] S113. Determine whether the top liquid level sensor has changed from a no-signal state to a signal state; if it has changed to a signal state, proceed to step S114; otherwise, return to step S112.

[0019] S114. Reset the timing of the top liquid level sensor when it is in a no-signal state to zero, and return to execute step S111.

[0020] S115. Determine that the top liquid level sensor or liquid replenishment device is malfunctioning.

[0021] Furthermore, the second time threshold t2 is greater than the time interval between the moment when the top liquid level sensor changes from a signal state to a no-signal state and the moment when the replenishment device starts replenishing the heating liquid, plus the time interval between the liquid level of the heating liquid from the start moment to the end moment of replenishment when the replenishment device replenishes the heating liquid under normal circumstances.

[0022] Furthermore, an overflow port is provided at the upper part of the liquid heating chamber, and the overflow port is located higher than the top liquid level sensor. The second time threshold t2 is less than the time interval between the moment when the top liquid level sensor changes from a signal state to a no-signal state and the moment when the replenishing device starts replenishing the heating liquid, plus the time when the replenishing device replenishes the liquid under normal circumstances, from the moment the replenishing begins to the moment the heating liquid rises to overflow from the overflow port.

[0023] Furthermore, the method by which the fault judgment unit detects whether the top liquid level sensor or the liquid replenishment device has malfunctioned is as follows:

[0024] S301. Detect whether the replenishing device is replenishing heating fluid, and simultaneously time the replenishing time of the heating element by the replenishing device at the start of replenishing heating fluid.

[0025] S302. Determine whether the timing of the liquid replenishment device has reached or exceeded the preset third time threshold t3; if it has reached or exceeded the preset third time threshold t3, then execute step S305; otherwise, execute step S303.

[0026] S303. Check if the replenishment device has stopped replenishing the heating fluid; if the replenishment device has stopped replenishing the heating fluid, proceed to step S304; otherwise, return to step S302.

[0027] S304. Reset the timing of the replenishment of heating liquid by the replenishment device to zero, and return to step S301.

[0028] S305, It is determined that the top liquid level sensor or the liquid replenishment device is malfunctioning.

[0029] Furthermore, the third time threshold t3 is greater than the time interval between the start and end times of replenishing the heating liquid when the replenishing device replenishes the heating liquid under normal circumstances; and the third time threshold t3 is less than the time it takes for the heating liquid level to drop from the position of the top level sensor to the position of the bottom level sensor when the heater is continuously heating.

[0030] Furthermore, the controller is electrically connected to an alarm. When the fault judgment unit detects a fault in the anti-dry-burning device, the controller causes the alarm to emit an alarm signal and stops the heater from heating.

[0031] In this invention, the fault judgment unit can promptly detect when the liquid level sensor and liquid replenishment device of the liquid heating equipment malfunction, thereby providing safety protection when the liquid level sensor and liquid replenishment device of the liquid heating equipment malfunction, reducing product quality problems caused by device failure, and significantly reducing or even eliminating serious safety accidents such as scalding and fire caused by liquid level sensor failure in liquid heating equipment. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0033] Figure 1This is a partial perspective view of a preferred embodiment of the liquid heating device of the present invention, which has a fault detection function for preventing dry burning.

[0034] Figure 2 for Figure 1 The main view.

[0035] Figure 3 This is a block diagram showing the electrical connections of the controller.

[0036] Figure 4 A flowchart of a judgment logic for detecting whether an anti-dry-burning device has malfunctioned.

[0037] Figure 5 A flowchart of another judgment logic for detecting whether the anti-dry-burning device has malfunctioned.

[0038] Figure 6 A flowchart of another judgment logic for detecting whether the anti-dry-burning device has malfunctioned.

[0039] The meanings of the labels in the attached diagram are as follows:

[0040] Heating container-1; Condensation chamber-2; Condenser-3; Condensation tray-4; Groove-5; Condensate collection port-6; Overflow port-7; Replenishment port-8; Heating liquid-9; Liquid heating chamber-10; Controller-90; Top liquid level sensor-91; Bottom liquid level sensor-92; Replenishment device-93; Fault diagnosis unit-94; Heater-95. Detailed Implementation

[0041] The following specific examples illustrate the implementation of the present invention. The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0042] Please see Figure 1 and Figure 2 A preferred embodiment of the liquid heating device with anti-dry-burning device fault detection function of the present invention includes a heating container 1, an anti-dry-burning device, a fault judgment unit 94, and a controller 90. The heating container 1 has a cavity, which includes an upper condensing chamber 2 and a lower liquid heating chamber 10. A condenser 3 is provided in the condensing chamber 2, and the condenser 3 may be a condensing coil. A condensing tray 4 is provided below the condenser 3, and the condensing tray 4 is located at the junction of the liquid heating chamber 10 and the condensing chamber 2.

[0043] The condensing tray 4 is provided with a groove 5 for receiving the condensed heating liquid 9. In this embodiment, the condensing tray 4 is square-ring shaped, thus forming a square-ring groove 5 along the inner wall of the cavity for receiving the condensed heating liquid 9 flowing down from the condensing coil. The bottom of the condensing chamber 2 is provided with a condensate collection port 6 communicating with the groove 5. The condensate collection port 6 is used to connect a collection container to store the condensed heating liquid 9 received by the condensing tray 4.

[0044] A heater 95 is installed at the bottom of the liquid heating chamber 10. A heating liquid 9 is placed inside the liquid heating chamber 10. The heater 95 heats the heating liquid 9, and the heated liquid 9 heats the object to be heated through heat conduction. The object can be directly placed into the liquid heating chamber 10 and heated by the heating liquid 9; alternatively, a heating plate can be installed on the outer wall of the heating container 1 to heat the object. An overflow port 7 is also provided at the top of the liquid heating chamber 10, and the overflow port 7 is located above the position of the top liquid level sensor 91.

[0045] The heating chamber is also equipped with a liquid replenishment port 8, which is generally located at the bottom of the liquid heating chamber 10. This port is used to replenish the heating liquid 9 into the liquid heating chamber 10 to compensate for losses due to evaporation of the heating liquid 9. The anti-dry-burning device includes a bottom liquid level sensor 92 located near the bottom of the liquid heating chamber 10, a top liquid level sensor 91 located near the top of the liquid heating chamber 10, and a liquid replenishment device 93 connected to the liquid replenishment port 8. Please refer to [link / reference]. Figure 3 The heater 95, top liquid level sensor 91, bottom liquid level sensor 92, liquid replenishment device 93, and fault judgment unit 94 are all electrically connected to the controller 90. The height of the top liquid level sensor 91 is lower than the height of the overflow port 7, and the height of the bottom liquid level sensor 92 is higher than the height of the heater 95. When the bottom liquid level sensor 92 is in a no-signal state (i.e., no heating liquid 9 is detected), the controller 90 causes the heater 95 to stop heating.

[0046] The replenishing device 93 is used to replenish the heating liquid 9 to the liquid heating chamber 10 through the replenishing port 8. The top liquid level sensor 91 is in a no-signal state at the start of replenishing the heating liquid 93, and the top liquid level sensor 91 is in a signal state (i.e., heating liquid 9 is detected) at the end of replenishing the heating liquid 93. For example, the start time of replenishing the heating liquid 93 can be the moment when the top liquid level sensor 91 changes from a signal state to a no-signal state, or the moment after a predetermined delay (at which time the height of the heating liquid 9 should be higher than the height of the bottom liquid level sensor 92). The end time of replenishing the heating liquid 93 can be the moment when the top liquid level sensor 91 changes from a no-signal state to a signal state, or the moment after a predetermined delay (at which time the height of the heating liquid 9 should be lower than the height of the overflow port 7). Alternatively, another liquid level sensor can be installed between the top liquid level sensor 91 and the overflow port 7, and the moment when this liquid level sensor changes from a no-signal state to a signal state can be used as the end time of replenishing the heating liquid 93. In this embodiment, the time delay is calculated after the top liquid level sensor 91 changes from a signal state to a no-signal state for a predetermined duration T. 01 The time after which the replenishment device 93 begins replenishing the heating liquid 9 is used as the start time, and the time after which the top liquid level sensor 91 changes from a no-signal state to a signal state is delayed by a predetermined time T. 02 The time after that is the end time for the replenishment of heating liquid 9 by the replenishment device 93.

[0047] The fault judgment unit 94 is used to detect the working status of anti-dry-burning devices such as the top liquid level sensor 91, the bottom liquid level sensor 92, and the liquid replenishment device 93, and to determine whether these devices have malfunctioned. To promptly alert operators when these devices malfunction, the controller 90 is also electrically connected to an alarm. When the fault judgment unit 94 detects a malfunction in the anti-dry-burning device, the controller 90 activates the alarm and stops the heater 95 from heating. In this embodiment, the following four judgment logics are used to determine whether the top liquid level sensor 91, the bottom liquid level sensor 92, and the liquid replenishment device 93 have malfunctioned.

[0048] Judgment Logic 1

[0049] The first judgment logic is used to determine whether the bottom liquid level sensor 92 has malfunctioned. The specific judgment method is as follows: The states of the top liquid level sensor 91 and the bottom liquid level sensor 92 are compared. When the top liquid level sensor 91 is in a signal state while the bottom liquid level sensor 92 is in a no-signal state; since this situation is obviously impossible during normal operation, it is determined that the bottom liquid level sensor 92 has malfunctioned. At this time, the controller 90 activates the alarm signal and stops the heater 95 to prevent dry burning; then, maintenance personnel are awaited to handle the situation. Because the bottom liquid level sensor 92 is the last line of defense against dry burning in liquid heating equipment, it is generally not needed for judgment under normal circumstances. Therefore, damage to the bottom liquid level sensor 92 is usually difficult to detect. However, if a malfunction of the bottom liquid level sensor 92 goes undetected, it greatly increases the probability of dry burning in the liquid heating equipment, significantly increasing the safety risk. Using the above judgment logic allows for rapid detection and handling of bottom liquid level sensor 92 malfunctions, ensuring the safe operation of the liquid heating equipment.

[0050] Judgment Logic 2

[0051] Please see Figure 4 The second judgment logic is used to determine whether the top liquid level sensor 91 has malfunctioned. The specific judgment method includes the following steps:

[0052] S101. When the heater 95 of the liquid heating equipment is working, the system detects whether the top liquid level sensor 91 is in a signal state, and starts timing when the top liquid level sensor 91 is detected to be in a signal state. A signal state from the top liquid level sensor 91 indicates that the liquid level of the heating liquid 9 is higher than the position of the top liquid level sensor 91. There are two possibilities: First, when the liquid heating equipment is turned on, the liquid level of the heating liquid 9 is higher than the position of the top liquid level sensor 91; in this case, no liquid replenishment will be performed. Second, the liquid level of the heating liquid 9 was initially lower than the position of the top liquid level sensor 91, but during the replenishment process, the liquid level of the heating liquid 9 rises from below the position of the top liquid level sensor 91 to the position of the top liquid level sensor 91; in this case, the system will continue to replenish the heating liquid 9 until the time T is reached. 02 Only then will the replenishment of heating fluid stop.

[0053] S102. Determine whether the timing of the top liquid level sensor 91 being in a signal state has reached or exceeded a preset first time threshold t1; if it has reached or exceeded the preset first time threshold t1, it indicates that the top liquid level sensor 91 has malfunctioned, and proceed to step S105; otherwise, proceed to step S103 to continue the determination. The range of the first time threshold t1 is: (T 11 +T 02 ) < t1 < T 12 .

[0054] Among them, T 11 When the heater 95 is continuously heating (without adding new heating liquid 9 by the replenishment device 93), the time required for the liquid level of the heating liquid 9 to drop from its highest point to the position of the top liquid level sensor 91; T 12 When the heater 95 is continuously heating (without adding new heating fluid 9 to the replenishment device 93), the time required for the level of the heating fluid 9 to drop from the position of the top level sensor 91 to the position of the bottom level sensor 92. Normally, T... 12 Much greater than T 11 And T 12 It will also be greater than (T) 11 +T 02 By limiting the minimum value of t1, frequent misjudgments can be avoided due to an excessively small first time threshold t1. Conversely, by limiting the maximum value of t1, failure to detect faults in a timely manner, leading to dry burning, can be avoided. When the top liquid level sensor 91 is in a signal state and liquid replenishment is stopped immediately, T... 02 =0.

[0055] S103. Determine whether the top liquid level sensor 91 changes from a signal-on state to a signal-off state. If it changes to a signal-off state, it means that the heating liquid 9 has dropped below the top liquid level sensor 91 due to evaporation, and this situation has been accurately detected by the top liquid level sensor 91, indicating that the top liquid level sensor 91 is working normally. Proceed to step S104. Otherwise, return to step S102 to continue detecting the timing of the top liquid level sensor 91 being in a signal-on state.

[0056] S104. Reset the timing of the top liquid level sensor 91 when it is in a signal state to zero, and return to step S101; resume timing when the top liquid level sensor 91 is in a signal state again.

[0057] S105. A fault is detected in the top liquid level sensor 91. At this time, the controller 90 activates the alarm and stops the heater 95 to prevent dry burning; awaiting maintenance personnel for handling.

[0058] Judgment Logic 3

[0059] Please see Figure 5 The third judgment logic is used to determine whether the top liquid level sensor 91 or the liquid replenishment device 93 has malfunctioned. The specific judgment method includes the following steps:

[0060] S111. When the heater 95 of the liquid heating device is working, detect whether the top liquid level sensor 91 is in a no-signal state, and start timing when the top liquid level sensor 91 is detected to be in a no-signal state. The top liquid level sensor 91 being in a no-signal state indicates that the liquid level of the heating liquid 9 is lower than the position of the top liquid level sensor 91.

[0061] S112. Determine whether the timing of the top liquid level sensor 91 being in a no-signal state has reached or exceeded a preset second time threshold t2; if it has reached or exceeded the preset second time threshold t2, proceed to step S115; otherwise, proceed to step S113. The range of the second time threshold t2 is: (T 21 +T 01 ) < t2 < (T 22 +T 01 ).

[0062] Among them, T 21 When replenishing the heating liquid 9 to the replenishing device 93 under normal circumstances, the time interval between the start and end times of replenishment of the heating liquid 9 is the time required for the replenishing device 93 to replenish the heating liquid 9 once under normal circumstances. 22 When replenishing the liquid in the replenishing device 93 under normal conditions, the time from the start of replenishment to the time it takes for the level of the heating liquid 9 to rise and overflow from the overflow port 7 is recorded. When replenishment is performed immediately when the top level sensor 91 is in a no-signal state, T... 01 =0.

[0063] S113. Determine whether the top liquid level sensor 91 changes from a no-signal state to a signal state; if it changes to a signal state, it means that the heating liquid 9 has dropped below the top liquid level sensor 91 due to evaporation, and the delay time reaches T. 01 Afterwards, the replenishing device 93 replenishes the liquid, causing the level of the heating liquid 9 to rise to the position of the top liquid level sensor 91; and this situation is accurately detected by the top liquid level sensor 91, meaning that both the replenishing device 93 and the top liquid level sensor 91 are working normally, and step S114 is executed. Otherwise, the process returns to step S112 to continue detecting the time when the top liquid level sensor 91 is in a no-signal state.

[0064] S114. Reset the timing of the top liquid level sensor 91 when it is in a no-signal state to zero, and return to step S111; resume timing when the top liquid level sensor 91 is in a no-signal state again.

[0065] S115. It is determined that at least one of the top liquid level sensor 91 and the liquid replenishment device 93 has malfunctioned. At this time, the controller 90 causes the alarm to sound and stops the heater 95 from heating to prevent dry burning; wait for maintenance personnel to handle the situation.

[0066] Judgment Logic 4

[0067] Please see Figure 6 The fourth judgment logic is used to determine whether the top liquid level sensor 91 or the liquid replenishment device 93 has malfunctioned. The specific judgment method includes the following steps:

[0068] S301. Detect whether the replenishing device 93 is replenishing the heating liquid 9, and simultaneously time the replenishing time of the heating element by the replenishing device 93 at the start of replenishing the heating liquid 9. The moment when the controller 90 issues the start replenishing command to the replenishing device 93 can be directly taken as the start time of replenishing the heating liquid 9 by the replenishing device 93 to simplify the detection process.

[0069] S302. Determine whether the timing of the liquid replenishment by the liquid replenishment device 93 has reached or exceeded a preset third time threshold t3; if it has reached or exceeded the preset third time threshold t3, proceed to step S305; otherwise, proceed to step S303. The value range of the third time threshold t3 is: T 21 <t3<T 12 .

[0070] S303, Detect whether the replenishing device 93 has stopped replenishing the heating liquid 9; if the replenishing device 93 has stopped replenishing the heating liquid 9, it means that the replenishing device 93 has raised the liquid level of the heating liquid 9 to the position of the top liquid level sensor 91 through replenishment; and this situation has been accurately detected by the top liquid level sensor 91, thus during the delay time T 02 Afterwards, the replenishment of heating liquid 9 stops, indicating that both the replenishment device 93 and the top liquid level sensor 91 are functioning normally, and step S304 is executed. Otherwise, the process returns to step S302 to continue monitoring the timing of the replenishment of liquid by the replenishment device 93. In this step, it is possible to directly detect whether the controller 90 issues a stop replenishment command to the replenishment device 93. If the controller 90 issues a stop replenishment command, it is assumed that the replenishment device 93 has stopped replenishing heating liquid 9, avoiding the need to monitor a new sensor after adding another one.

[0071] S304. Reset the timing of the replenishment device 93 for replenishing the heating liquid 9 to zero, and return to step S301; the timing will resume when the replenishment device 93 replenishes the heating liquid 9 again.

[0072] S305, it is determined that at least one of the top liquid level sensor 91 and the liquid replenishment device 93 has malfunctioned. At this time, the controller 90 causes the alarm to sound and stops the heater 95 from heating to prevent dry burning; wait for maintenance personnel to handle the situation.

[0073] In this embodiment, the failure status of the top liquid level sensor 91, bottom liquid level sensor 92, and liquid replenishment device 93 of the liquid heating equipment can be detected in a timely manner through the above four judgment logics. Thus, when the top liquid level sensor 91, bottom liquid level sensor 92, and liquid replenishment device 93 of the liquid heating equipment fail, the heater 95 is cut off in time to provide safety protection, reduce product quality problems caused by device failure, and at the same time, it can significantly reduce or even eliminate serious safety accidents such as scalding and fire caused by liquid level sensor failure of the liquid heating equipment.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A liquid heating appliance having a dry-burn device fault detection function, characterised in that: The device comprises a heating container, a dry-burning prevention device, a fault judging unit and a controller, the heating container is provided with a cavity, the cavity comprises a condensation chamber at the upper part and a liquid heating chamber at the lower part; the condensation chamber is provided with a condenser, the lower part of the condenser is provided with a condensation tray, the condensation tray is located at the junction of the liquid heating chamber and the condensation chamber; the condensation tray is provided with a groove, the bottom of the condensation chamber is provided with a condensation liquid collecting port communicated with the groove; the bottom of the liquid heating chamber is provided with a heater, the liquid heating chamber is provided with heating liquid, the heating chamber is further provided with a liquid supplementing port; the heater, the dry-burning prevention device and the fault judging unit are electrically connected with the controller, the fault judging unit is used for detecting the working state of the dry-burning prevention device and judging whether the dry-burning prevention device is faulty. The dry-burning prevention device comprises a bottom liquid level sensor arranged at the position adjacent to the bottom of the liquid heating chamber, a top liquid level sensor arranged at the position adjacent to the top of the liquid heating chamber and a liquid supplementing device connected with the liquid supplementing port; the height of the bottom liquid level sensor is higher than the height of the heater; when the bottom liquid level sensor is in the no-signal state, the controller stops the heater; the liquid supplementing device is used for supplementing the heating liquid to the liquid heating chamber through the liquid supplementing port, and the top liquid level sensor is in the no-signal state at the starting time of the liquid supplementing device, and the top liquid level sensor is in the signal state at the ending time of the liquid supplementing device. The method for detecting whether the top liquid level sensor is faulty comprises the following steps: S101, detecting whether the top liquid level sensor is in the signal state when the heater of the liquid heating device is working, and starting timing when the top liquid level sensor is detected to be in the signal state; S102, judging whether the timing time of the top liquid level sensor being in the signal state reaches or exceeds a pre-set first time threshold t1; if the pre-set first time threshold t1 is reached or exceeded, the step S105 is executed; otherwise, the step S103 is executed; S103, judging whether the top liquid level sensor changes from the signal state to the no-signal state; if the top liquid level sensor changes to the no-signal state, the step S104 is executed; otherwise, the step S102 is executed; S104, resetting the timing time of the top liquid level sensor being in the signal state, and returning to execute the step S101; S105, judging that the top liquid level sensor is faulty.

2. The liquid heating apparatus with dry-burn device fault detection functionality of claim 1, wherein: The method for detecting whether the bottom liquid level sensor is faulty comprises comparing the states of the top liquid level sensor and the bottom liquid level sensor, and judging that the bottom liquid level sensor is faulty if the top liquid level sensor is in the signal state and the bottom liquid level sensor is in the no-signal state.

3. The liquid heating apparatus with dry-burn device fault detection functionality according to claim 1 or 2, characterized in that: The first time threshold t1 is greater than the time required for the liquid level of the heating liquid to drop from the highest position of the liquid to the position of the top liquid level sensor plus the time interval between the time when the heating liquid is detected by the top liquid level sensor and the time when the liquid supplement device stops supplementing the heating liquid under the condition that the heater continues to heat, and the first time threshold t1 is less than the time required for the liquid level of the heating liquid to drop from the position of the top liquid level sensor to the position of the bottom liquid level sensor under the condition that the heater continues to heat.

4. The liquid heating apparatus with dry-burn device fault detection functionality of claim 1, wherein: The method for detecting whether the top liquid level sensor or the liquid supplement device is faulty comprises the following steps: S111, detecting whether the top liquid level sensor is in a no-signal state when the heater of the liquid heating device is working, and starting timing when it is detected that the top liquid level sensor is in the no-signal state; S112, judging whether the timing time of the top liquid level sensor being in the no-signal state reaches or exceeds a pre-set second time threshold t2; if the pre-set second time threshold t2 is reached or exceeded, executing step S115; otherwise, executing step S113; S113, judging whether the top liquid level sensor changes from the no-signal state to a signal state; if the top liquid level sensor changes to the signal state, executing step S114; otherwise, returning to execute step S112; S114, resetting the timing time of the top liquid level sensor being in the no-signal state, and returning to execute step S111; S115, determining that the top liquid level sensor or the liquid supplement device is faulty.

5. The liquid heating apparatus with dry-burn device fault detection functionality of claim 4, wherein: The second time threshold t2 is greater than the time interval between the time when the top liquid level sensor changes from the signal state to the no-signal state and the time when the liquid supplement device starts to supplement the heating liquid plus the time interval between the time when the liquid supplement device starts to supplement the heating liquid and the time when the liquid supplement device stops supplementing the heating liquid under the normal condition.

6. The liquid heating apparatus with dry-burn device fault detection functionality of claim 5, wherein: The liquid heating chamber further comprises an overflow port at the upper portion of the liquid heating chamber, and the position of the overflow port is higher than the position of the top liquid level sensor; the second time threshold t2 is less than the time interval between the time when the top liquid level sensor changes from the signal state to the no-signal state and the time when the liquid supplement device starts to supplement the heating liquid plus the time interval between the time when the liquid supplement device starts to supplement the heating liquid and the time when the heating liquid rises to overflow from the overflow port under the normal condition of the liquid supplement device supplementing the heating liquid.

7. A liquid heating apparatus with dry-burn device fault detection functionality according to claim 6, characterised in that: The method for detecting whether the top liquid level sensor or the liquid supplement device is faulty comprises the following steps: S301, detecting whether the liquid supplement device is supplementing the heating liquid, and starting timing the time when the liquid supplement device supplements the heating liquid at the same time when the liquid supplement device starts to supplement the heating liquid; S302, judging whether the timing time of the liquid supplement device supplementing the liquid reaches or exceeds a pre-set third time threshold t3; if the pre-set third time threshold t3 is reached or exceeded, executing step S305; otherwise, executing step S303; S303, detecting whether the liquid supplement device stops supplementing the heating liquid; if the liquid supplement device has stopped supplementing the heating liquid, executing step S304; otherwise, returning to execute step S302; S304, determining that the liquid supplement device is faulty; and S305, determining that the top liquid level sensor is faulty. S304, reset the time for the liquid supplementing device to supplement the heating liquid, and return to execute S301; S305, determine whether the top liquid level sensor or the liquid supplementing device is malfunctioning.

8. The liquid heating apparatus with dry-burn device fault detection functionality of claim 7, wherein: The third time threshold t3 is greater than a time interval between a start time of supplementing the heating liquid and an end time of supplementing the heating liquid in a normal case that the liquid supplementing device supplements the heating liquid, and the third time threshold t3 is less than a time for the liquid level of the heating liquid to drop from a position where the top liquid level sensor is located to a position where the bottom liquid level sensor is located in a case that the heater continues to heat.

9. The liquid heating apparatus with dry-burn device fault detection functionality of claim 1, wherein: The controller is electrically connected with an alarm, when the malfunction judging unit detects that the anti-dry burning device is malfunctioning, the controller makes the alarm send an alarm signal, and makes the heater stop heating.

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