Water tank heating system

Abstract

The invention relates to a water tank heating system which is characterized in that when the system is powered on, a switch of a water inlet device is controlled based on the water level detected by a first water level detection module, so that the water level is kept near a high water level; controlling the switch of the heater based on the temperature detected by the temperature detection module so that the water temperature is kept above the lower temperature limit; when the system runs, the water outlet device is opened, and the water level in the water tank is detected in real time based on the second water level detection module; when the detected water level is lower than the low water level, the water outlet device and / or the heater are / is closed; the temperature is detected in real time based on a temperature detection module; and when the change quantity of the detected temperature in the adjacent sampling time is greater than the temperature threshold value, closing the water outlet device and / or the heater. Low water level detection is carried out in two different modes, potential safety hazards caused when one of the second water level detection module and the temperature detection module fails can be avoided, and double safety protection is achieved.

Description

Technical Field

[0001] The invention relates to the field of heating equipment, and in particular to a water tank heating system. Background Art

[0002] In the field of washing equipment, water tanks with water inlet and outlet devices are often used. The water volume and temperature in the water tank need to be controlled, that is, the water inlet or outlet needs to be controlled at different water levels to ensure the required water volume, and the water in the water tank is kept in a temperature range by controlling the heating device. The existing practice is usually to let water in when the water level is low and stop letting water in when the water level reaches the high level; to heat when the temperature is below the lower limit and stop heating when the temperature is above the upper limit. This practice has the following technical problems: 1. Heating is generally not allowed for safety reasons at low water levels, and using only one water level gauge to determine the low water level is often not reliable enough; 2. During operation, water replenishment in the water tank can easily cause large fluctuations in water temperature. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a water tank heating system.

[0004] The specific plan is as follows:

[0005] A water tank heating system comprises: a heater, a water tank, a water inlet device and a water outlet device, wherein the heater is arranged at the bottom of the water tank; the water inlet device is installed at the water inlet of the water tank; the water outlet device is installed at the water outlet of the water tank; and further comprises: a first water level detection module, a second water level detection module and a temperature detection module; the first water level detection module and the second water level detection module are installed at different water levels on the inner wall of the water tank, and are used to detect the water level in the water tank, wherein the first water level detection module is arranged at a high water level, and the high water level indicates that the water tank is at a full water level, and the second water level detection module is arranged at a low water level, and the low water level indicates the water level when the water tank cannot work normally; the temperature detection module is installed on the inner wall of the water tank, and is used to detect the temperature in the water tank, and the temperature detection module and the second water level detection module are arranged adjacent to each other in the height direction;

[0006] (1) When the system is powered on, perform operations 1 and 2:

[0007] Operation 1: Based on the first water level detection module, the water level in the water tank is detected in real time; when the detected water level is lower than the high water level, the water inlet device is turned on to allow water to enter the water tank; when the detected water level is higher than the high water level, the water inlet device is turned off;

[0008] Operation 2: Real-time temperature detection based on the temperature detection module; when the detected temperature is lower than the lower temperature limit, the heater is turned on for heating; when the detected temperature is higher than the upper temperature limit, the heater is turned off;

[0009] (2) When the system is running, open the water outlet device and perform operations 3 and 4 in addition to the above operations 1 and 2:

[0010] Operation three: detecting the water level in the water tank in real time based on the second water level detection module; when the detected water level is lower than the low water level, turning off the water outlet device and / or the heater;

[0011] Operation 4: Real-time temperature detection based on the temperature detection module; when the change in the detected temperature within adjacent sampling times is greater than the temperature threshold, the water outlet device and / or the heater are turned off.

[0012] Furthermore, the temperature detection module and the second water level detection module are set at the same water level or at different water levels. When they are set at different water levels, the height difference corresponding to the different water levels is less than the height threshold.

[0013] Furthermore, the water inlet device includes a first water inlet device and a second water inlet device; the water inlet device in operation one is changed to the first water inlet device; the operation of the system during operation has the following different operation modes based on the different water levels of the temperature detection module and the second water level detection module:

[0014] (1) When the water level of the temperature detection module is higher than that of the second water level detection module, operation three remains unchanged, and operation four is changed to: real-time temperature detection based on the temperature detection module; when the detected temperature changes within adjacent sampling times by more than the temperature threshold, the second water inlet device is opened, and the second water inlet device is closed after being opened for a rated time; when the detected temperature changes within adjacent sampling times by more than the temperature threshold for more than the number of times during the operation of the secondary system, the water outlet device and / or the heater is closed;

[0015] (2) When the water level of the temperature detection module is lower than that of the second water level detection module, operation four remains unchanged, and operation three is changed to: based on the second water level detection module, the water level in the water tank is detected in real time; when the detected water level is lower than the low water level, the second water inlet device is opened, and the second water inlet device is closed after being opened for a rated time; when the number of times the water level detected during the operation of the secondary system is lower than the low water level is greater than the number threshold, the water outlet device and / or the heater is closed.

[0016] Furthermore, the first water inlet device is used for inletting cold water, and the second water inlet device is used for inletting hot water or cold water.

[0017] Furthermore, the water inlet device is a single water inlet device, which can realize switching between two different water sources through a control valve, and the two water sources before and after the switching correspond to the water source corresponding to the first water inlet device and the water source corresponding to the second water inlet device respectively.

[0018] Furthermore, the water outlet device adopts a water pump.

[0019] Furthermore, it also includes a water return device for returning the water flowing out of the water outlet device to the water tank.

[0020] Furthermore, after the water outlet device and / or the heater are turned off, an alarm is also generated.

[0021] The present invention adopts the above technical solution and performs low water level detection in two different ways, thereby avoiding the potential safety hazard caused by the failure of one of the second water level detection module and the temperature detection module, and achieving double safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic diagram of the structure of the system in an embodiment of the present invention.

[0023] Figure 2 The figure is a schematic diagram of the structure when the system in this embodiment includes a first water inlet device and a second water inlet device. DETAILED DESCRIPTION

[0024] To further illustrate various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementations and advantages of the present invention.

[0025] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0026] Embodiment 1:

[0027] The embodiment of the present invention provides a water tank heating system, such as Figure 1 As shown, it includes: a heater, a water tank, a water inlet device, a water outlet device, a first water level detection module, a second water level detection module and a temperature detection module. The heater is arranged at the bottom of the water tank; the water inlet device is installed at the water inlet of the water tank; the water outlet device is installed at the water outlet of the water tank; the first water level detection module and the second water level detection module are installed at different water levels on the inner wall of the water tank, and are used to detect the water level in the water tank, wherein the first water level detection module is arranged at a high water level, which indicates the water level when the water tank is in a normal working state, and the second water level detection module is arranged at a low water level, which indicates the water level when the water tank cannot work normally; the temperature detection module is installed on the inner wall of the water tank, and is used to detect the temperature in the water tank, and the temperature detection module and the second water level detection module are arranged adjacent to each other in the height direction.

[0028] The temperature detection module and the second water level detection module, which are adjacently arranged in the height direction, have an extremely small height difference (less than a set height difference threshold), and need to be in different positions at the same height (i.e. the same water level) to avoid being too close and causing a higher abnormal risk.

[0029] The temperature detection module and the second water level detection module are adjacently arranged in the height direction, including the following three situations: the temperature detection module and the second water level detection module are arranged at the same water level, the temperature detection module is arranged above the second water level detection module, and the temperature detection module is arranged below the second water level detection module. When the temperature detection module and the second water level detection module are arranged at different water levels, the height difference corresponding to the water levels of the two should be less than the height threshold (such as 5 cm), so that the temperature detection module and the second water level detection module can jointly play the role of double insurance.

[0030] The system includes two stages. The first stage is the power-on state (i.e., startup or standby). At this time, the water in the water tank is not used. It is necessary to ensure the water level and water temperature in the water tank, that is, the water level is kept near the high water level, and the water temperature is kept above the lower temperature limit. Based on this, in this embodiment, it is set that when the system is started, operation one and operation two are executed:

[0031] Operation 1: Based on the first water level detection module, the water level in the water tank is detected in real time; when the detected water level is lower than the high water level, the water inlet device is turned on to allow water to enter the water tank; when the detected water level is higher than the high water level, the water inlet device is turned off. Operation 1 can keep the water level in the water tank near the high water level.

[0032] Operation 2: Real-time temperature detection based on the temperature detection module; when the detected temperature is lower than the lower temperature limit, turn on the heater for heating; when the detected temperature is higher than the upper temperature limit, turn off the heater. Operation 2 can keep the water temperature in the water tank above the lower temperature limit.

[0033] The high water level, low water level, upper temperature limit and lower temperature limit can be set by technicians in this field according to their needs and are not limited here.

[0034] The second stage is the running state, that is, the stage where the water in the water tank needs to be used. At this time, the water outlet device is turned on, and water continuously flows out through the water outlet device. At this time, under certain abnormal conditions, the water level may be too low (i.e., below the low water level). At this time, the water outlet device and / or the heater should be turned off in time to avoid empty burning and affecting the use of water by people. If possible, a low water level alarm can also be issued to better remind people to pay attention to the abnormality. Based on this, it is set in this embodiment that when the system is running, on the basis of the above operations one and two, operations three and four are additionally performed:

[0035] Operation three: detecting the water level in the water tank in real time based on the second water level detection module; when the detected water level is lower than the low water level, turning off the water outlet device and / or the heater.

[0036] Operation 4: Real-time temperature detection based on the temperature detection module; when the change in the detected temperature within adjacent sampling times is greater than the temperature threshold, the water outlet device and / or the heater are turned off.

[0037] By performing detection in two different ways in step three and step four, potential safety hazards caused by failure of one of the second water level detection module and the temperature detection module can be avoided, thereby achieving double safety protection.

[0038] Furthermore, considering that when the inlet water flow is less than the outlet water flow, in order to avoid frequent alarms, a water replenishment structure is also added in this embodiment.

[0039] In one embodiment, the water inlet device may include a first water inlet device and a second water inlet device, wherein the first water inlet device is used to inlet cold water, and the second water inlet device may be used to inlet hot water or cold water, preferably hot water, to replenish hot water and ensure that the water temperature in the water tank does not fluctuate greatly. Figure 2 As shown, in this embodiment, the water inlet device in operation one is changed to the first water inlet device; the operation of the system during operation has the following different operation modes based on the different water levels of the temperature detection module and the second water level detection module:

[0040] (1) When the water level of the temperature detection module is higher than that of the second water level detection module, operation three remains unchanged, and operation four is changed to: real-time temperature detection based on the temperature detection module; when the detected temperature changes within adjacent sampling times by more than the temperature threshold, the second water inlet device is opened, and the second water inlet device is closed after being opened for a rated time; when the detected temperature changes within adjacent sampling times by more than the temperature threshold for more than the number of times during the operation of the secondary system, the water outlet device and / or the heater is closed;

[0041] (2) When the water level of the temperature detection module is lower than that of the second water level detection module, operation four remains unchanged, and operation three is changed to: based on the second water level detection module, the water level in the water tank is detected in real time; when the detected water level is lower than the low water level, the second water inlet device is opened, and the second water inlet device is closed after being opened for a rated time; when the number of times the water level detected during the operation of the secondary system is lower than the low water level is greater than the number threshold, the water outlet device and / or the heater is closed.

[0042] The second water inlet device may be a water pump to achieve faster water replenishment.

[0043] In another embodiment, the water inlet device is set as a single water inlet device, which can realize the switching of two different water sources (such as cold water and hot water with different flow rates, or two cold water with different flow rates) through a control valve, and the two water sources before and after the switching correspond to the water source corresponding to the first water inlet device and the water source corresponding to the second water inlet device respectively. The system operation mode of this embodiment is similar to the operation mode when the first water inlet device and the second water inlet device are included, and will not be repeated here.

[0044] In this embodiment, the heater adopts an electric heating tube or an electric heating plate, the water inlet is arranged above the water tank and higher than the high water level, the water outlet is arranged below the water tank and lower than the low water level, the first water level detection module and the second water level detection module both adopt water level sensors, and the temperature detection module adopts a temperature sensor. The alarm can adopt a combination of sound and light, or can adopt an alarm method such as display screen, which is not limited here.

[0045] In this embodiment, the system is used in a washing process. Therefore, the water outlet device is set to use a water pump to achieve rapid water outlet. It also includes a water return device, which is used to return the water flowing out of the water outlet device to the water tank. The water return device includes a water return pipeline and a spray device arranged above the water tank.

[0046] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A water tank heating system, comprising: A heater, a water tank, a water inlet device and a water outlet device, wherein the heater is arranged at the bottom of the water tank; the water inlet device is installed at the water inlet of the water tank; the water outlet device is installed at the water outlet of the water tank; it is characterized in that it also includes: a first water level detection module, a second water level detection module and a temperature detection module; the first water level detection module and the second water level detection module are installed at different water levels on the inner wall of the water tank, and are used to detect the water level in the water tank, wherein the first water level detection module is arranged at a high water level, and the high water level indicates that the water tank is at a full water level, and the second water level detection module is arranged at a low water level, and the low water level indicates the water level when the water tank cannot work normally; the temperature detection module is installed on the inner wall of the water tank, and is used to detect the temperature in the water tank, and the temperature detection module and the second water level detection module are arranged adjacent to each other in the height direction; (1) When the system is powered on, perform operations 1 and 2: Operation 1: Based on the first water level detection module, the water level in the water tank is detected in real time; when the detected water level is lower than the high water level, the water inlet device is turned on to allow water to enter the water tank; when the detected water level is higher than the high water level, the water inlet device is turned off; Operation 2: Real-time temperature detection based on the temperature detection module; when the detected temperature is lower than the lower temperature limit, the heater is turned on for heating; when the detected temperature is higher than the upper temperature limit, the heater is turned off; (2) When the system is running, open the water outlet device and perform operations 3 and 4 in addition to the above operations 1 and 2: Operation three: detecting the water level in the water tank in real time based on the second water level detection module; when the detected water level is lower than the low water level, turning off the water outlet device and / or the heater; Operation 4: Real-time temperature detection based on the temperature detection module; when the change in the detected temperature within adjacent sampling times is greater than the temperature threshold, the water outlet device and / or the heater are turned off.

2. The water tank heating system according to claim 1, characterized in that: The temperature detection module and the second water level detection module are arranged at the same water level or at different water levels. When they are arranged at different water levels, the height difference corresponding to the different water levels is less than the height threshold.

3. The water tank heating system according to claim 1, characterized in that: The water inlet device includes a first water inlet device and a second water inlet device; the water inlet device in operation one is changed to the first water inlet device; the operation of the system during operation has the following different operation modes based on the different water levels of the temperature detection module and the second water level detection module: (1) When the water level of the temperature detection module is higher than that of the second water level detection module, operation three remains unchanged, and operation four is changed to: real-time temperature detection based on the temperature detection module; when the detected temperature changes within adjacent sampling times by more than the temperature threshold, the second water inlet device is opened, and the second water inlet device is closed after being opened for a rated time; when the detected temperature changes within adjacent sampling times by more than the temperature threshold for more than the number of times during the operation of the secondary system, the water outlet device and / or the heater is closed; (2) When the water level of the temperature detection module is lower than that of the second water level detection module, operation four remains unchanged, and operation three is changed to: based on the second water level detection module, the water level in the water tank is detected in real time; when the detected water level is lower than the low water level, the second water inlet device is opened, and the second water inlet device is closed after being opened for a rated time; when the number of times the water level detected during the operation of the secondary system is lower than the low water level is greater than the number threshold, the water outlet device and / or the heater is closed.

4. The water tank heating system according to claim 3, characterized in that: The first water inlet device is used for inletting cold water, and the second water inlet device is used for inletting hot water or cold water.

5. The water tank heating system according to claim 3, characterized in that: The water inlet device is a single water inlet device, which can realize the switching of two different water sources through a control valve. The two water sources before and after the switching correspond to the water source corresponding to the first water inlet device and the water source corresponding to the second water inlet device respectively.

6. The water tank heating system according to claim 1, characterized in that: The water outlet device adopts a water pump.

7. The water tank heating system according to claim 1, characterized in that: It also includes a water return device, which is used to return the water flowing out of the water outlet device to the water tank.

8. The water tank heating system according to claim 1, characterized in that: After the water outlet device and / or the heater are turned off, an alarm is also included.

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