CN112503777A

CN112503777A - Control method for water temperature of water heater

Info

Publication number: CN112503777A
Application number: CN202011378832.9A
Authority: CN
Inventors: 李荣江; 高德福
Original assignee: Guangdong Jiwei Technology Co Ltd
Current assignee: Guangdong Jiwei Technology Co Ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-03-16
Anticipated expiration: 2040-12-01
Also published as: CN112503777B

Abstract

As the service life of the household air energy water heater is prolonged, water scale can be gradually formed in a water tank of the water heater, so that the heat exchange efficiency of the water heater is influenced, the system pressure of the water heater is increased, the exhaust temperature of the water heater is increased, and the unit triggers high-pressure protection and high-temperature protection when the actual temperature of hot water does not reach the temperature requirement of water for a user. According to the invention, when the unit triggers high-voltage protection or high-temperature protection, whether T5 is more than or equal to Ts-Tr is compared, so that whether the unit fails to stop due to poor heat exchange effect caused by scale is judged, then, the water temperature Ts is set to be T5-1 ℃ when T5 is more than or equal to Ts-Tr, the high-voltage protection and the high-temperature protection of the hot water unit caused by the rise of the system pressure and the rise of the exhaust temperature are avoided, and the failure stop of the hot water unit caused by the frequent high-voltage protection and the high-temperature protection is further avoided.

Description

Control method for water temperature of water heater

Technical Field

The invention relates to the technical field of water heaters, in particular to a water temperature control method of a water heater.

Background

Generally, as the service life of a household air energy water heater is prolonged, water scales are gradually formed in a water tank of the water heater, so that the heat exchange efficiency of the water heater is influenced, the system pressure of the water heater is increased, the exhaust temperature of the water heater is increased, and a unit triggers high-pressure protection and high-temperature protection when the actual temperature of hot water does not reach the temperature requirement of water for a user. At present, the domestic air energy water heater is a constant speed machine, and the problems can not be solved by measures such as reducing frequency and increasing the opening degree of an electronic expansion valve, so that the problems such as frequent occurrence of high-pressure protection and high-temperature protection are caused, and a water heater unit is damaged.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a method for controlling the water temperature of a water heater.

In order to achieve the purpose, the invention provides a scheme of a control method for water temperature of a water heater, wherein the control method comprises the following steps:

step S1, reading a set water temperature Ts;

step S2, when the unit triggers high-pressure protection or high-temperature protection, reading the current water temperature T5;

step S3, judging whether T5 is more than or equal to the difference value between the set water temperature Ts and the shutdown return difference temperature Tr;

step S4, if T5 is not more than Ts-Tr, the unit stops running; on the contrary, if the T5 is more than or equal to Ts-Tr, the set water temperature Ts is marked as T5-1 ℃.

Further, the temperature of the unit triggering the high-temperature protection is higher than the set water temperature Ts.

Further, the shutdown return difference temperature Tr is a preset fixed value.

Further, the shutdown return difference temperature Tr can be preset through an electric control dial.

Furthermore, the water heater unit comprises a display module, a temperature setting module, a temperature detection module and an internal control module, wherein the display module, the temperature setting module and the temperature detection module are respectively connected to the internal control module.

Further, the temperature detection module is used for detecting the current water temperature T5 of the water heater.

Further, the temperature setting module is used for a user to set the set water temperature Ts.

Further, the internal control module is used for reading the set water temperature Ts and the current water temperature T5, judging and comparing the magnitude relation between the current temperature T5 and Ts-Tr, and controlling the action of the display module.

Further, the display module is used for displaying the set temperature Ts and a fault code.

Further, in step S4, if T5 is not greater than Ts-Tr, the internal control module controls the display module to display a fault code.

The invention has the beneficial effects that: when the unit triggers high-voltage protection or high-temperature protection, whether T5 is larger than or equal to Ts-Tr or not is compared, whether the unit fails or not due to poor heat exchange effect caused by scale is judged, then, the water temperature Ts is set to be T5-1 ℃ when T5 is larger than or equal to Ts-Tr, the situation that the high-voltage protection and the high-temperature protection frequently occur to the hot water unit due to system pressure rise and exhaust temperature rise is avoided, and the situation that the hot water unit fails or stops due to the frequent high-voltage protection and the high-temperature protection is further avoided.

Drawings

Fig. 1 is a schematic connection diagram of internal modules of a water heater.

Fig. 2 is a control method step diagram.

Detailed Description

To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1, in the present embodiment, a method for controlling a water temperature of a water heater is provided, where the water heater includes a display module, a temperature setting module, a temperature detecting module, and an internal control module, and the display module, the temperature setting module, and the temperature detecting module are respectively connected to the internal control module. The temperature setting module is used for presetting a set water temperature Ts by a user according to the required hot water temperature; the display module is used for displaying and displaying the fault code and the set temperature Ts; the temperature detection module is used for detecting the current temperature T5 of hot water of the hot water machine.

In this embodiment, the temperature of the unit triggering the high temperature protection is higher than the set water temperature Ts.

Referring to fig. 1 or 2, in the present embodiment, the method for controlling water temperature includes the following steps:

step S1: the internal control module reads and records the set water temperature Ts.

Step S2: when the unit triggers high-pressure protection or high-temperature protection in the process of heating the water heater, the internal control module reads and records the current temperature T5 of the hot water detected by the temperature detection module.

Step S3: the internal control module judges whether the comparison current temperature T5 is greater than or equal to the difference value between the set water temperature Ts and the shutdown return difference temperature Tr, wherein the shutdown return difference temperature Tr is a fixed value preset through the electric control dial.

Step S4: if the comparison result of the internal control module is that T5 is not less than Ts-Tr, the current temperature T5 of the hot water is close to the water temperature required by the user, at the moment, the internal control module controls the display module not to display the fault code, then the internal control module marks the set water temperature Ts as T5-1 ℃, the set water temperature Ts is reduced to be close to the current temperature T5, and the hot water machine is normally stopped, so that the frequent occurrence of high-pressure protection and high-temperature protection due to the increase of system pressure and the increase of exhaust temperature of the hot water machine set is avoided, and the fault stop of the hot water machine due to the frequent occurrence of the high-pressure protection and the high-temperature protection is. If the comparison result of the internal control module is that T5 is less than Ts-Tr, the current temperature T5 of the hot water is far from the water temperature required by the water consumption of the user, and further the current fault shutdown does not occur due to poor heat exchange effect caused by scale, at the moment, the internal control module controls the display module to display a fault code, and then the unit stops running.

The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.

Claims

1. A control method of water temperature of a water heater is characterized by comprising the following steps: the control method comprises the following steps:

step S1, reading a set water temperature Ts;

2. The method for controlling the water temperature of the water heater according to claim 1, wherein: and the temperature of the unit triggering the high-temperature protection is higher than the set water temperature Ts.

3. The method for controlling the water temperature of the water heater according to claim 1, wherein: the shutdown return difference temperature Tr is a preset fixed value.

4. The method for controlling the water temperature of the water heater according to claim 3, wherein: the shutdown return difference temperature Tr can be preset through an electric control dial.

5. The method for controlling the water temperature of the water heater according to claim 1, wherein: the water heater unit comprises a display module, a temperature setting module, a temperature detection module and an internal control module, wherein the display module, the temperature setting module and the temperature detection module are respectively connected to the internal control module.

6. The method for controlling the water temperature of the water heater according to claim 5, wherein: the temperature detection module is used for detecting the current water temperature T5 of the water heater.

7. The method for controlling the water temperature of the water heater according to claim 5, wherein: the temperature setting module is used for setting the set water temperature Ts by a user.

8. The method for controlling the water temperature of the water heater according to claim 5, wherein: the internal control module is used for reading the set water temperature Ts and the current water temperature T5, judging and comparing the magnitude relation between the current temperature T5 and Ts-Tr, and controlling the action of the display module.

9. The method for controlling the water temperature of the water heater according to claim 5, wherein: the display module is used for displaying the set temperature Ts and the fault code.

10. The method for controlling water temperature of a water heater according to claim 1, 8 or 9, wherein: in step S4, if T5 is not greater than Ts-Tr, the internal control module controls the display module to display a fault code.