CN102563884A - Control method and control system capable of preventing liquid heating equipment from parching - Google Patents

Abstract

Translated fromChinese

本发明提供一种控制方法和控制系统，不断检测液体加热设备中的温度变化并计算出温度增加速率，将其与所设定阈值比较来判断是否发生干烧。为了避免因水位波动等因素造成的误检测，本发明通过连续三次采集的数据来判断是否出现干烧的情况。同时可通过LED显示灯向用户发出故障警示，提醒用户检查热水器和管路。本发明通过温升的速度来判断液体加热设备中是否发生干烧，来保护电加热，提高设备的使用寿命，为液体加热设备的使用提供安全保障，避免发生安全事故。

The invention provides a control method and a control system, which continuously detects the temperature change in the liquid heating equipment and calculates the temperature increase rate, and compares it with the set threshold value to judge whether dry burning occurs. In order to avoid false detection caused by factors such as water level fluctuations, the present invention judges whether dry burning occurs through data collected three times in a row. At the same time, it can issue a fault warning to the user through the LED display light, reminding the user to check the water heater and pipeline. The invention judges whether dry burning occurs in the liquid heating equipment through the speed of temperature rise, thereby protecting the electric heating, improving the service life of the equipment, providing safety guarantee for the use of the liquid heating equipment, and avoiding safety accidents.

Description

Translated fromChinese

一种防止液体加热设备干烧的控制方法和系统A control method and system for preventing liquid heating equipment from dry burning

技术领域technical field

本发明涉及一种液体加热设备的控制方法和系统，更具体的，涉及一种液体加热设备防干烧的控制方法和系统。The present invention relates to a control method and system for liquid heating equipment, and more specifically, to a control method and system for preventing dry heating of liquid heating equipment.

背景技术Background technique

随着社会的发展，液体加热设备的应用越来越普遍。但是，当热水器等液体加热设备发生过热时，可能会发生危险，特别是在液体烧干的情况下，热量的积累可能导致设备损坏，更严重的甚至导致火灾或导致使用者遭受烧伤。目前现有技术中，热水器或其他热水设备中的电加热，多使用温控器串联到控制电源的主回路中，当水温达到或者超过保护值时，温控器断开从而切断电源。如果电加热出现干烧的情况，只有干烧的温度达到或者超过保护值，温控器才断开产生保护。With the development of society, the application of liquid heating equipment is becoming more and more common. However, when liquid heating equipment such as a water heater overheats, it can be dangerous, especially if the liquid boils dry. The heat accumulation may cause damage to the equipment, and even cause a fire or cause burns to the user. In the current prior art, for electric heating in water heaters or other hot water equipment, a thermostat is usually connected in series to the main circuit of the control power supply. When the water temperature reaches or exceeds the protection value, the thermostat is disconnected to cut off the power supply. If the electric heating is dry-burned, only when the dry-burning temperature reaches or exceeds the protection value, the thermostat will be disconnected to generate protection.

但是，上述形式的传统热水器或其他液体加热设备中的电加热控制方法和系统存在如下缺点：However, the electric heating control method and system in the above-mentioned traditional water heater or other liquid heating equipment have the following disadvantages:

1.当系统中出现无水或水量不足的情况时，电加热无法正常判断而产生干烧的情况，对电加热寿命有影响，更重要的是安全问题得不到保障；1. When there is no water or insufficient water in the system, the electric heating cannot be judged normally and dry burning occurs, which will affect the life of the electric heating, and more importantly, the safety problem cannot be guaranteed;

2.若因电流过大造成温控器的触点出现粘连的情况，电加热会一直通电工作，最终可能因温度过高造成安全事故；2. If the contacts of the thermostat are stuck due to excessive current, the electric heating will always be energized and work, which may eventually cause a safety accident due to excessive temperature;

3.发生干烧等故障时无法通知用户，不及时的发现并解决故障，对用户的安全构成威胁；3. The user cannot be notified when a fault such as dry burning occurs, and the fault is not discovered and resolved in time, which poses a threat to the safety of the user;

4.现有的通过传感器检测温度的做法，均为只要检测到温度上升超过限制就立即保护，不能避免传感器检测误差或者压力导致水位波动产生的影响，导致电加热频繁关断，影响使用。4. The existing method of detecting temperature through sensors is to protect immediately as soon as the temperature rise exceeds the limit. It cannot avoid the influence of sensor detection error or pressure-induced water level fluctuation, resulting in frequent shutdown of electric heating and affecting use.

发明内容Contents of the invention

为了解决现有技术中的上述不足，本发明提供一种防止液体加热设备干烧的控制方法和系统，可以有效的保护液体加热设备，防止干烧，并能滤除水位波动和检测误差的影响，提高判断结果的准确性。In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a control method and system for preventing dry heating of liquid heating equipment, which can effectively protect liquid heating equipment, prevent dry burning, and filter out the influence of water level fluctuations and detection errors , to improve the accuracy of judgment results.

本发明中防止液体加热设备干烧的控制方法包括如下步骤：In the present invention, the control method for preventing liquid heating equipment from dry burning comprises the following steps:

步骤A：由加热设备内部的测温单元每隔固定时间间隔检测一次温度，Step A: The temperature measurement unit inside the heating equipment detects the temperature at regular intervals,

步骤B：计算单元计算出该时间间隔内的加热设备内部温度增加值，Step B: the calculation unit calculates the internal temperature increase value of the heating device within the time interval,

步骤C：计算单元由计算出该时间间隔内的升温速率，Step C: the calculation unit calculates the heating rate in the time interval,

步骤D：判断升温速率是否超出所设定的升温速率阈值，Step D: judging whether the heating rate exceeds the set heating rate threshold,

步骤E：如果升温速率超过所设定的升温速率阈值，记录单元将该结果记录下来，Step E: If the heating rate exceeds the set heating rate threshold, the recording unit records the result,

步骤F：判断连续超过升温速率阈值的次数是否超过所设定的次数阈值，Step F: judging whether the number of consecutive times exceeding the threshold value of the heating rate exceeds the set threshold value,

步骤G：如果超过所设定的次数阈值，则判断为发生干烧。Step G: If it exceeds the preset number of times threshold, it is judged that dry burning occurs.

进一步的，判断为干烧后，输出干烧报警信号。Further, after it is judged as dry heating, a dry heating alarm signal is output.

进一步的，判断为干烧后，控制电路启动，停止加热。Further, after it is judged as dry heating, the control circuit starts and stops heating.

进一步的，升温速率阈值与电热器的功率、加热容器的容积、液体的含量、散热环境因素有关。Further, the temperature rise rate threshold is related to the power of the electric heater, the volume of the heating container, the content of the liquid, and heat dissipation environmental factors.

进一步的，升温速率阈值设置为1摄氏度每秒。Further, the heating rate threshold is set to 1 degree Celsius per second.

进一步的，次数阈值设置为3次。Further, the number of times threshold is set to 3 times.

进一步的，所述固定时间间隔为1分钟。Further, the fixed time interval is 1 minute.

进一步的，所述液体包括水、油。Further, the liquid includes water and oil.

本发明还提供一种一种能够防止液体加热设备干烧的控制系统，该控制系统包括计算单元、第一判断单元、第二判断单元、控制单元，其中The present invention also provides a control system capable of preventing dry heating of liquid heating equipment, the control system includes a calculation unit, a first judging unit, a second judging unit, and a control unit, wherein

计算单元，计算加热设备内部的升温速度，Calculation unit to calculate the temperature rise rate inside the heating device,

第一判断单元，判断该升温速率是否超过所设定的升温速率阈值，The first judging unit judges whether the heating rate exceeds the set heating rate threshold,

记录单元，以及升温速率连续超过所述升温速率阈值的次数，record the unit, and the number of times the heating rate continuously exceeds the threshold value of the heating rate,

第二判断单元，进一步判断连续超过升温速率的次数是否超过所设定的次数阈值，如果超过次数阈值，通知控制单元，The second judging unit further judges whether the number of times of continuously exceeding the heating rate exceeds the set threshold value, and if it exceeds the threshold value of the number of times, it notifies the control unit,

控制单元，控制该液体加热设备做出相应的反应。A control unit controls the liquid heating device to respond accordingly.

进一步的，该加热装置还包括报警单元。所述控制单元控制液体加热设备中的报警单元在判断发生干烧后输出报警信号。Further, the heating device also includes an alarm unit. The control unit controls the alarm unit in the liquid heating device to output an alarm signal after judging that dry burning occurs.

进一步的，控制单元还适于控制报警单元输出声或光或振动形式的报警信号。Further, the control unit is also suitable for controlling the alarm unit to output an alarm signal in the form of sound, light or vibration.

进一步的，所述控制单元控制液体加热设备中的加热单元停止加热。Further, the control unit controls the heating unit in the liquid heating device to stop heating.

进一步的，次数阈值设置为3次。Further, the number of times threshold is set to 3 times.

进一步的，所述测温单元设置为温度传感器。Further, the temperature measuring unit is set as a temperature sensor.

进一步的，所述加热单元为电加热管。Further, the heating unit is an electric heating tube.

进一步的，所述温度传感器设置在测温盲管中。Further, the temperature sensor is arranged in a temperature measuring blind pipe.

进一步的，所述液体加热设备为热水器。Further, the liquid heating equipment is a water heater.

本发明具有如下优点：The present invention has the following advantages:

第一.本发明通过温升的速度来判断热水器或者其他热水设备中是否发生干烧，来保护电加热，提高设备的使用寿命，为热水器产品的使用提供安全保障；Firstly, the present invention judges whether dry burning occurs in the water heater or other hot water equipment through the speed of temperature rise, so as to protect the electric heating, improve the service life of the equipment, and provide safety guarantee for the use of water heater products;

第二.即使温控器坏掉或者粘连的情况下，仍可根据温升的速度和采集到的温度值来进行判断，控制电加热避免长时间通电工作和干烧；Second. Even if the thermostat is broken or stuck, it can still be judged according to the speed of temperature rise and the collected temperature value, and the electric heating can be controlled to avoid long-term power-on work and dry burning;

第三.可以向用户发出故障警告，避免发生安全事故；Third. It can issue fault warnings to users to avoid safety accidents;

第四.滤除了水位波动、传感器测量误差等因素造成的误检测影响，提高了检测的准确性。Fourth, the influence of false detection caused by factors such as water level fluctuations and sensor measurement errors is filtered out, and the accuracy of detection is improved.

附图说明Description of drawings

下面根据实施例与附图对本发明作进一步详细说明。The present invention will be described in further detail below according to the embodiments and the accompanying drawings.

图1是分别对液体、空气进行加热的升温曲线示意图；Fig. 1 is a schematic diagram of a temperature rise curve for heating liquid and air respectively;

图2是几种不同规格的液体加热设备分别对液体、空气进行加热的升温曲线示意图；Fig. 2 is a schematic diagram of the heating curves of liquid and air heated by several liquid heating equipment of different specifications;

图3是本发明中第一实施例中的控制方法的流程示意图；Fig. 3 is a schematic flow chart of the control method in the first embodiment of the present invention;

图4是本发明中第二实施例中的控制方法的流程示意图；Fig. 4 is a schematic flow chart of the control method in the second embodiment of the present invention;

图5是本发明第三实施例中的加热设备的结构示意图；Fig. 5 is a schematic structural view of a heating device in a third embodiment of the present invention;

图6是本发明第四实施例中的加热设备电路示意图。Fig. 6 is a schematic diagram of a heating device circuit in a fourth embodiment of the present invention.

图中附图标记所指代的技术特征分别是：The technical features indicated by the reference numerals in the figure are respectively:

1、外壳；2、电加热管；3、温控器；4、测温盲管；5、温度传感器。1. Shell; 2. Electric heating tube; 3. Thermostat; 4. Blind tube for temperature measurement; 5. Temperature sensor.

具体实施方式Detailed ways

在由于水和空气的比热不同，水的比热为4200J/Kg·℃，而空气的比热为1004J/Kg·℃，因此在单位时间内使用相同功率的电加热来加热两种介质，空气温度的变化幅度要大于水的温度变化幅度，我们就可以根据温度变化情况来判断是否有干烧的情况发生从而进行保护。Because the specific heat of water and air is different, the specific heat of water is 4200J/Kg·℃, while the specific heat of air is 1004J/Kg·℃, so the electric heating with the same power is used to heat the two media in unit time, The range of change in air temperature is greater than that of water, so we can judge whether there is dry burning according to the temperature change and then protect it.

图1示出了是液体加热设备中加热空气和加热水过程中温度上升的示意图。由图中可以看出，例如在时间轴上的第15分钟到第25分钟，10分钟的时间段之内，空气的温度升高了约20度，水的温度升高了约5度，可见对空气加热的温度增加速率远超水的温度增加速率。Figure 1 shows a schematic diagram of temperature rise during heating of air and heating of water in a liquid heating device. It can be seen from the figure that, for example, from the 15th minute to the 25th minute on the time axis, within a period of 10 minutes, the temperature of the air increased by about 20 degrees, and the temperature of the water increased by about 5 degrees. It can be seen that The rate of temperature increase for air heating far exceeds the rate of temperature increase for water.

图2中选择了市面上比较常见的三种常见规格的热水器来进行模拟实验，其容积分别为150升，200升，300升，来确定其温度变化速率。具体实验数据如图2：In Fig. 2, three water heaters of common specifications on the market are selected for simulation experiments, and their volumes are 150 liters, 200 liters, and 300 liters respectively to determine their temperature change rates. The specific experimental data is shown in Figure 2:

通过对比加热空气的实验和加热水的实验，我们得出，相同的加热条件下，加热水时传感器采集到的温度变化率约为0.5℃/分钟，而加热空气时传感器采集到的温度变化率为2℃/分钟。By comparing the experiment of heating air and the experiment of heating water, we concluded that under the same heating conditions, the temperature change rate collected by the sensor when heating water is about 0.5°C/min, while the temperature change rate collected by the sensor when heating air is about 0.5°C/min. 2°C/min.

需要指出的是，升温速率与电热器的功率、加热容器的容积、液体的含量、散热环境因素有关。It should be pointed out that the heating rate is related to the power of the electric heater, the volume of the heating container, the content of the liquid, and the environmental factors of heat dissipation.

第一实施例first embodiment

本发明的第一优选实施例提供这样一种防止液体加热设备发生干烧的控制方法，该方法通过测温单元采集加热设备中的温度数据，每隔1分钟检测一次温度，记为Ti。计算单元将所测得的温度Ti与上次所测得的温度Ti-1相减，求得这一分钟内的温度增加值ΔT。将该温度增加值ΔT除以时间间隔1分钟即可求得温度增加速率ΔT/t。The first preferred embodiment of the present invention provides such a control method for preventing dry burning of liquid heating equipment. The method uses a temperature measuring unit to collect temperature data in the heating equipment, and detects the temperature every 1 minute, denoted as Ti. The calculation unit subtracts the measured temperature Ti from the last measured temperature Ti-1 to obtain the temperature increase value ΔT within this minute. The temperature increase rate ΔT/t can be obtained by dividing the temperature increase value ΔT by the time interval of 1 minute.

第一判断单元将该温度增加速率ΔT/t与设定温度增加速率阈值相比较，如果未超过该温度增加速率阈值，控制单元判断为没有发生干烧，继续正常加热和重复上述检测、判断步骤；如果该温度增加速率ΔT/t超过所设定的温度增加速率阈值，将其记录为一次异常。The first judging unit compares the temperature increasing rate ΔT/t with the set temperature increasing rate threshold, if the temperature increasing rate threshold is not exceeded, the control unit judges that no dry burning occurs, continues normal heating and repeats the above detection and judging steps ; If the temperature increase rate ΔT/t exceeds the set temperature increase rate threshold, record it as an abnormality.

升温速率阈值与电热器的功率、加热容器的容积、液体的含量、散热环境因素有关。在本实施例中，升温速率阈值设定为1℃/秒。The temperature rise rate threshold is related to the power of the electric heater, the volume of the heating container, the content of the liquid, and the environmental factors of heat dissipation. In this embodiment, the heating rate threshold is set at 1° C./second.

由于加热流体会产生对流甚至水位波动，还有可能在检查过程中出现测量误差。因此，为避免水位波动或者传感器误差带来的影响，本实施例中的控制方法继续对温度变化进行检测和判断，如果仅仅出现一次异常随后变成正常，则说明该次测量结果为误差或波动等因素所导致的；第二判断单元将连续记录到升温异常的次数与所设定的次数阈值相比较，例如如果连续三次记录到异常，控制单元判断为发生了干烧。There is also the possibility of measurement errors during the inspection due to convection currents and even level fluctuations of the heated fluid. Therefore, in order to avoid the impact of water level fluctuations or sensor errors, the control method in this embodiment continues to detect and judge temperature changes. If only one abnormality occurs and then becomes normal, it means that the measurement result is an error or fluctuation. and other factors; the second judging unit compares the number of consecutively recorded abnormal temperature rises with the set threshold, for example, if abnormalities are recorded three times in a row, the control unit judges that dry burning has occurred.

在控制单元判断发生干烧之后，控制单元自动控制该加热设备停止加热。After the control unit determines that dry burning occurs, the control unit automatically controls the heating device to stop heating.

第二实施例second embodiment

在该第二实施例中，防止液体加热设备发生干烧的控制方法通过测温单元采集加热设备中的温度数据，每隔2分钟检测一次温度，记为Ti。计算单元将所测得的温度Ti与上次所测得的温度Ti-1相减，求得这2分钟内的温度增加值ΔT。将该温度增加值ΔT除以时间间隔2分钟即可求得温度增加速率ΔT/t。In the second embodiment, the control method for preventing dry burning of the liquid heating equipment uses the temperature measuring unit to collect temperature data in the heating equipment, and detects the temperature every 2 minutes, denoted as Ti. The calculation unit subtracts the measured temperature Ti from the last measured temperature Ti-1 to obtain the temperature increase value ΔT within these 2 minutes. The temperature increase rate ΔT/t can be obtained by dividing the temperature increase value ΔT by the time interval of 2 minutes.

第一判断单元将该温度增加速率ΔT/t与设定温度增加速率阈值相比较，如果未超过该温度增加速率阈值，控制单元判断为没有发生干烧，继续正常加热和重复上述检测、判断步骤；如果该温度增加速率ΔT/t超过所设定的温度增加速率阈值，将其记录为一次异常。The first judging unit compares the temperature increasing rate ΔT/t with the set temperature increasing rate threshold, if the temperature increasing rate threshold is not exceeded, the control unit judges that no dry burning occurs, continues normal heating and repeats the above detection and judging steps ; If the temperature increase rate ΔT/t exceeds the set temperature increase rate threshold, record it as an abnormality.

升温速率阈值与电热器的功率、加热容器的容积、液体的含量、散热环境因素有关。在本实施例中，升温速率阈值设定为0.5-2℃/秒中的某一值，例如0.8℃/秒。The temperature rise rate threshold is related to the power of the electric heater, the volume of the heating container, the content of the liquid, and the environmental factors of heat dissipation. In this embodiment, the heating rate threshold is set to a certain value in 0.5-2° C./s, for example, 0.8° C./s.

由于加热流体会产生对流甚至水位波动，还有可能在检查过程中出现测量误差。因此，为避免水位波动或者传感器误差带来的影响，本实施例中的控制方法继续对温度变化进行检测和判断，如果仅仅出现一次异常随后变成正常，则说明该次测量结果为误差或波动等因素所导致的；第二判断单元将连续记录到升温异常的次数与所设定的次数阈值相比较，例如如果连续三次记录到异常，控制单元判断为发生了干烧。There is also the possibility of measurement errors during the inspection due to convection currents and even level fluctuations of the heated fluid. Therefore, in order to avoid the impact of water level fluctuations or sensor errors, the control method in this embodiment continues to detect and judge temperature changes. If only one abnormality occurs and then becomes normal, it means that the measurement result is an error or fluctuation. and other factors; the second judging unit compares the number of consecutively recorded abnormal temperature rises with the set threshold, for example, if abnormalities are recorded three times in a row, the control unit judges that dry burning has occurred.

在控制单元判断发生干烧之后，警报输出单元输出警示信号，该警示信号可以是鸣笛、蜂鸣等各种声音信号，或者LED显示灯、闪烁的光信号等形式。After the control unit judges that dry burning occurs, the alarm output unit outputs a warning signal, which can be in the form of various sound signals such as whistle and buzzer, or in the form of LED display lights or flashing light signals.

可选的，在发出警示信号的同时，控制单元停止加热设备的加热。Optionally, the control unit stops the heating of the heating device while sending out the warning signal.

可选的，控制单元也可以并不立即停止加热设备的加热，而是等待用户的干预操作。但是，在该过程中继续执行上述检测过程，当报警信号发出后一定时间内(例如2分钟)仍未有用户操作，则控制单元控制该加热设备停止加热。Optionally, the control unit may not stop the heating of the heating device immediately, but wait for the user's intervention operation. However, during this process, the above detection process is continued, and when there is still no user operation within a certain period of time (for example, 2 minutes) after the alarm signal is sent out, the control unit controls the heating device to stop heating.

第三实施例third embodiment

在该实施例中，提供一种能够防止液体加热设备干烧的加热装置，该加热装置包括容纳液体的容器、电加热管2、测温单元、主芯片，其中主芯片包括计算单元、第一判断单元、记录单元、第二判断单元、控制单元，其中电加热管对容器内的液体进行加热，测温单元检测温度并传输信号。主芯片上的计算单元计算加热设备内部的升温速度；第一判断单元，判断该升温速率是否超过所设定的升温速率阈值1℃/秒；记录单元，记录升温速率连续超过所述升温速率阈值的次数；第二判断单元，进一步判断连续超过升温速率的次数是否达到3次，如果达到3次，通知控制单元；控制单元，控制该液体加热设备做出相应的反应。In this embodiment, a heating device capable of preventing dry burning of liquid heating equipment is provided, the heating device includes a container for containing liquid, an electric heating tube 2, a temperature measuring unit, and a main chip, wherein the main chip includes a computing unit, a first A judging unit, a recording unit, a second judging unit, and a control unit, wherein the electric heating tube heats the liquid in the container, and the temperature measuring unit detects the temperature and transmits signals. The calculation unit on the main chip calculates the temperature rise rate inside the heating device; the first judging unit judges whether the temperature rise rate exceeds the set temperature rise rate threshold of 1°C/s; the recording unit records that the temperature rise rate continuously exceeds the temperature rise rate threshold The second judging unit further judges whether the number of consecutively exceeding the heating rate reaches 3 times, and if it reaches 3 times, notifies the control unit; the control unit controls the liquid heating device to make a corresponding response.

可选的，升温速率阈值可以设置为0.5-2℃/秒之内的某一值。Optionally, the heating rate threshold can be set to a certain value within 0.5-2° C./second.

优选的，控制单元控制电加热管停止加热。Preferably, the control unit controls the electric heating tube to stop heating.

优选的，次数阈值设置为连续3-5次。Preferably, the number threshold is set to 3-5 consecutive times.

优选的，在电加热测温盲管4中(即感温包处)增加一个传感器5，该传感器的引出线接到主芯片上控制单元的相应端子上，通过传感器检测电加热温度变化，供控制单元进行判断和控制。Preferably, asensor 5 is added in the electric heating temperature measuring blind tube 4 (i.e. at the temperature sensing package), the lead wire of the sensor is connected to the corresponding terminal of the control unit on the main chip, and the electric heating temperature change is detected by the sensor for supplying The control unit performs judgment and control.

第四实施例Fourth embodiment

在该实施例中，提供一种能够防止液体加热设备干烧的加热装置，该加热装置包括容纳液体的容器、电加热管2、测温单元、主芯片，其中主芯片包括计算单元、第一判断单元、记录单元、第二判断单元、控制单元、警示单元，其中电加热管对容器内的液体进行加热，测温单元检测温度并传输信号。主芯片上的计算单元计算加热设备内部的升温速度；第一判断单元，判断该升温速率是否超过所设定的升温速率阈值1℃/秒；记录单元，记录升温速率连续超过所述升温速率阈值的次数；第二判断单元，进一步判断连续超过升温速率的次数是否达到3次，如果达到3次，通知控制单元；控制单元通知警示单元发出警示信号，并控制该液体加热设备做出相应的反应。In this embodiment, a heating device capable of preventing dry burning of liquid heating equipment is provided, the heating device includes a container for containing liquid, an electric heating tube 2, a temperature measuring unit, and a main chip, wherein the main chip includes a computing unit, a first A judging unit, a recording unit, a second judging unit, a control unit, and a warning unit, wherein the electric heating tube heats the liquid in the container, and the temperature measuring unit detects the temperature and transmits a signal. The calculation unit on the main chip calculates the temperature rise rate inside the heating device; the first judging unit judges whether the temperature rise rate exceeds the set temperature rise rate threshold of 1°C/s; the recording unit records that the temperature rise rate continuously exceeds the temperature rise rate threshold The second judging unit further judges whether the number of consecutively exceeding the heating rate reaches 3 times, and if it reaches 3 times, it notifies the control unit; the control unit notifies the warning unit to send a warning signal, and controls the liquid heating equipment to make a corresponding response .

可选的，升温速率阈值可以设置为0.5-2℃/秒之内的某一值。Optionally, the heating rate threshold can be set to a certain value within 0.5-2° C./second.

可选的，该警示信号可以是鸣笛、蜂鸣等各种声音信号，或者LED显示灯、闪烁的光信号等形式。Optionally, the warning signal may be in the form of various sound signals such as whistle or buzzer, or in the form of LED display lights or flashing light signals.

优选的，控制单元控制电加热管停止加热。Preferably, the control unit controls the electric heating tube to stop heating.

优选的，次数阈值设置为连续3-5次。Preferably, the times threshold is set to 3-5 consecutive times.

优选的，在电加热测温盲管4中(即感温包处)增加一个传感器5，该传感器的引出线接到主芯片上控制单元的相应端子上，通过传感器检测电加热温度变化，供控制单元进行判断和控制。Preferably, asensor 5 is added in the electric heating temperature measuring blind tube 4 (i.e. at the temperature sensing package), the lead wire of the sensor is connected to the corresponding terminal of the control unit on the main chip, and the electric heating temperature change is detected by the sensor for supplying The control unit performs judgment and control.

本发明通过温升的速度来判断热水器或者其他热水设备中是否发生干烧，来保护电加热，提高设备的使用寿命，为热水器产品的使用提供安全保障；即使温控器坏掉或者粘连的情况下，仍可根据温升的速度和采集到的温度值来进行判断，控制电加热避免长时间通电工作和干烧；可以向用户发出故障警告，避免发生安全事故；并可以滤除水位波动或者测量误差所造成的影响。The present invention judges whether dry burning occurs in the water heater or other hot water equipment through the speed of temperature rise, so as to protect the electric heating, improve the service life of the equipment, and provide safety guarantee for the use of water heater products; even if the thermostat is broken or stuck Under certain circumstances, it can still be judged according to the speed of temperature rise and the collected temperature value, and the electric heating can be controlled to avoid long-term power-on work and dry heating; it can issue fault warnings to users to avoid safety accidents; and it can filter out water level fluctuations or the effects of measurement errors.

第五实施例fifth embodiment

该液体加热装置具有外壳1，在外壳中设置有电加热管2和测温盲管4，并且在测温盲管中还设置传感器5，在外壳的尾端设置有温控器3，该电热水器还设置有控制芯片，该控制芯片能够在传感器检测到干烧的情况下控制电加热管停止继续加热。The liquid heating device has a casing 1, in which an electric heating tube 2 and a temperature-measuring dead-leg 4 are arranged, and asensor 5 is also arranged in the temperature-measuring dead-leg, and athermostat 3 is arranged at the tail end of the casing. The water heater is also provided with a control chip, which can control the electric heating tube to stop heating when the sensor detects dry heating.

控制芯片中包括计算单元、第一判断单元、第二判断单元、控制单元，其中计算单元计算加热设备内部的升温速度，第一判断单元，判断该升温速率是否超过所设定的升温速率阈值，记录单元，以及升温速率连续超过所述升温速率阈值的次数，第二判断单元，进一步判断连续超过升温速率的次数是否超过所设定的次数阈值，如果超过次数阈值，通知控制单元，控制单元，控制该液体加热设备做出相应的反应。The control chip includes a computing unit, a first judging unit, a second judging unit, and a control unit, wherein the computing unit calculates the heating rate inside the heating device, and the first judging unit judges whether the heating rate exceeds the set heating rate threshold, The recording unit, and the number of times the heating rate continuously exceeds the threshold value of the heating rate, the second judging unit further judges whether the number of times continuously exceeding the heating rate exceeds the set threshold value, and if it exceeds the threshold value of the number of times, notify the control unit, the control unit, The liquid heating device is controlled to react accordingly.

进一步的，所述次数阈值设置为3次。Further, the number of times threshold is set to 3 times.

进一步的，所述外壳1内部所设置的电加热管2包括长加热管、短加热管、螺旋加热管、U型加热管中的一个或多个。Further, the electric heating tube 2 provided inside the housing 1 includes one or more of a long heating tube, a short heating tube, a spiral heating tube, and a U-shaped heating tube.

该加热装置还包括报警单元，该报警单元设置在外壳1的外部，该报警单元在判断发生干烧后输出报警信号。The heating device also includes an alarm unit, which is arranged outside the casing 1, and outputs an alarm signal after judging that dry heating occurs.

进一步的，所述液体加热设备为热水器。Further, the liquid heating equipment is a water heater.

进一步的，外壳尾端的温控器3与电加热管2电连接。Further, thethermostat 3 at the end of the casing is electrically connected to the electric heating tube 2 .

需要声明的是，上述具体实施方式仅仅为本发明的较佳实施例及所运用技术原理，在本发明所公开的技术范围内，任何熟悉本技术领域的技术人员所容易想到的变化或替换，都应涵盖在本发明的保护范围内。It should be stated that the above-mentioned specific implementation methods are only preferred embodiments of the present invention and the applied technical principles. Within the technical scope disclosed in the present invention, any changes or substitutions that are easily conceivable by those skilled in the art, All should be covered within the protection scope of the present invention.

Claims (10)

1. method that can prevent the liquid heating apparatus dry combustion method, this method comprises the steps:

Steps A: detect a temperature by the inner temperature measuring unit of firing equipment is every at a distance from Fixed Time Interval,

Step B: computing unit calculates the firing equipment internal temperature value added in this time interval,

Step C: computing unit is by the heating rate that calculates in this time interval,

Step D: judge whether heating rate exceeds the heating rate threshold value that sets,

Step e: if heating rate surpasses the heating rate threshold value that sets, record cell gets off this outcome record,

Step F: judge whether the number of times that surpasses the heating rate threshold value continuously surpasses the frequency threshold value that sets,

Step G:, then be judged as the generation dry combustion method if surpass the frequency threshold value that sets.

2. according to the method for claim 1, it is characterized in that, after being judged as dry combustion method, output dry combustion method alarm signal.

3. according to the method for claim 1, it is characterized in that after being judged as dry combustion method, control circuit starts, and stops heating.

4. according to the method for claim 1, it is characterized in that the heating rate threshold value is relevant with power, the volume of heating container, the content of liquid, the heat dissipation environment factor of electric heater.

5. according to the method for claim 4, it is characterized in that the heating rate threshold value is set to 1 degree centigrade of per second.

6. according to the method for claim 1, it is characterized in that frequency threshold value is set to 3 times.

7. according to the method for claim 1, it is characterized in that said Fixed Time Interval is 1 minute.

8. control system that can prevent the liquid heating apparatus dry combustion method, this control system comprises computing unit, first judging unit, second judging unit, control module, wherein

Computing unit calculates the inner programming rate of firing equipment,

First judging unit judges whether this heating rate surpasses the heating rate threshold value that sets,

Record cell, and the continuous number of times that surpasses said heating rate threshold value of heating rate,

Second judging unit judges further whether the number of times that surpasses heating rate continuously surpasses the frequency threshold value that sets, if surpass frequency threshold value, and the notice control module,

Control module is controlled this liquid heating apparatus and is made corresponding reaction.

9. according to Claim 8 control system is characterized in that, the alarm unit in the said control module control liquid heating apparatus judge dry combustion method takes place after output alarm signal.

10. according to Claim 8 control system is characterized in that, the heating unit in the said control module control liquid heating apparatus stops heating.

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