CN118310175A

CN118310175A - Antifreezing control method and control device thereof, and gas water heater

Info

Publication number: CN118310175A
Application number: CN202410492007.3A
Authority: CN
Inventors: 张上兵; 李光斌
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2024-04-23
Filing date: 2024-04-23
Publication date: 2024-07-09

Abstract

The application relates to an anti-freezing control method, a control device thereof and a gas water heater. The anti-freezing control method comprises the following steps: in a standby state, acquiring the water temperature of an internal circulation waterway and the ambient temperature; under the condition that the water temperature of the internal circulation waterway does not exceed the upper limit value of the preset threshold range, controlling the backwater control valve to be in a state of being communicated with the internal circulation waterway, and executing an antifreezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison result of the ambient temperature and the first preset value; wherein the anti-freezing action comprises controlling the circulating water pump and the fan to work, or controlling the circulating water pump, the fan and the heating module to work, or controlling the circulating water pump and the heating module to work; the first preset value is greater than the upper limit of the preset threshold range, and the lower limit of the preset threshold range is greater than 0. The method can effectively utilize the heat energy of the environment to reduce the frequent starting of the heating module, thereby reducing the energy consumption in the anti-freezing control process.

Description

Antifreezing control method and control device thereof, and gas water heater

Technical Field

The application relates to the technical field of water heater anti-freezing control, in particular to an anti-freezing control method and device and a gas water heater.

Background

In order to avoid the frost crack and water leakage of the pipeline of the gas water heater in cold weather, in the prior art, a bypass pipe is generally arranged at the furthest water consumption point and is communicated with a cold water pipe of the water heater, or a hot water pipe and the cold water pipe are communicated with the pipeline at the furthest water consumption point to form an external circulation pipeline, the external circulation pipeline is matched with a circulating water pump and ignition heating to realize preheating, and when the pipeline of the water heater needs to be subjected to frost protection, the whole external circulation pipeline is required to be utilized to implement circulation preheating every time, frequent circulation heating can occur, and the energy consumption is high.

Disclosure of Invention

The invention aims to provide an anti-freezing control method which can effectively reduce energy consumption in an anti-freezing control process.

The technical problems are solved by the following technical scheme:

The anti-freezing control method is applied to a gas water heater, and the gas water heater comprises a cold water pipe, a hot water pipe, a bypass pipe, a backwater control valve, a heat exchanger, a fan, a circulating water pump and a heating module; the water return end of the bypass pipe is communicated with the water return port on the cold water pipe, the water inlet end of the bypass pipe is communicated with the water return port on the hot water pipe, and the water outlet end of the cold water pipe and the water inlet end of the hot water pipe are respectively communicated with the heat exchanger to form an internal circulation waterway; the backwater control valve is arranged on the internal circulation water path and is used for switching on or off the bypass pipe; the circulating water pump is arranged on the internal circulating water path; the heating module is used for heating water in the internal circulation waterway; the method comprises the following steps:

in a standby state, acquiring the water temperature of an internal circulation waterway and the ambient temperature;

under the condition that the water temperature of the internal circulation waterway does not exceed the upper limit value of the preset threshold range, controlling the backwater control valve to be in a state of being communicated with the internal circulation waterway, and executing an antifreezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison result of the ambient temperature and the first preset value;

Wherein the anti-freezing action comprises controlling the circulating water pump and the fan to work, or controlling the circulating water pump, the fan and the heating module to work, or controlling the circulating water pump and the heating module to work; the first preset value is greater than the upper limit of the preset threshold range, and the lower limit of the preset threshold range is greater than 0.

According to the anti-freezing control method, the preset threshold range which is larger than 0 and the first preset value which is larger than the upper limit value of the preset threshold range are set, when the temperature on the inner circulation water path does not exceed the upper limit value of the preset threshold range in combination with the water temperature detection result of the inner circulation water path and the environment temperature detection result, the inner circulation water path is started to provide conditions for freezing, further, the water temperature of the inner circulation water path and the environment temperature are comprehensively considered, the working states of the circulating water pump, the fan and the heating module are determined based on the first comparison result and the second comparison result which can be used for representing the two conditions, the heat energy of the external environment can be effectively utilized, the frequent starting of the heating module is reduced, and the energy consumption in the anti-freezing control process is reduced.

In one embodiment, performing an anti-freeze action based on a first comparison of a water temperature of the internal circulation waterway and a preset threshold range and a second comparison of an ambient temperature and a first preset value includes:

And under the condition that the ambient temperature is greater than a first preset value, executing a first anti-freezing action until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range, wherein the first anti-freezing action comprises controlling the fan to operate at a first rotating speed and controlling the circulating water pump to operate at a second rotating speed.

The temperature difference between the ambient temperature and the internal circulation waterway is fully utilized to exchange heat, the fan is started to operate at the first rotational speed, hot air in the environment can be blown to the heat exchanger of the water heater to exchange heat with water flow of the heat exchanger pipeline, and the heat exchanger is arranged on the internal circulation waterway, so that the water temperature of the internal circulation waterway is increased, the starting time of the heating module can be delayed while the anti-freezing purpose is achieved, and the energy consumption is saved.

Executing a second anti-freezing action under the condition that the water temperature of the internal circulation waterway is in a preset threshold range and the ambient temperature is smaller than a first preset value until the water temperature of the internal circulation waterway is larger than the upper limit value of the preset threshold range, wherein the second anti-freezing action comprises controlling the circulating water pump to operate at a third rotating speed or controlling the circulating water pump to operate at the third rotating speed and controlling the fan to operate at a fourth rotating speed;

Wherein the third rotational speed is greater than the second rotational speed and the fourth rotational speed is greater than the first rotational speed.

When the ambient temperature is lower than a first preset value, the ambient temperature is lower at the moment, the temperature difference between the ambient temperature and the water temperature of the internal circulation waterway is smaller, the heat exchange effect of the starting fan is poorer, at the moment, the circulating water pump can be started only to enable water in the internal circulation waterway to flow, so that the water temperature of the internal circulation waterway is uniformly distributed all the time until the water temperature of the internal circulation waterway is higher than the upper limit value of the preset threshold range, at the moment, the pipeline is considered to be prevented from icing, the anti-freezing purpose is realized, and the noise is extremely low because the circulating water pump is started only, and the fan and the heating device are not started.

When the ambient temperature is lower than a first preset value, the circulating water pump can be controlled to operate at a third rotating speed, the fan is controlled to operate at a fourth lower rotating speed, and at the moment, the overall noise of the water heater is also in a low decibel, so that the antifreezing effect is realized, and meanwhile, the user experience is improved.

Executing a third anti-freezing action until the water temperature of the internal circulation waterway is greater than a second preset value under the condition that the water temperature of the internal circulation waterway is less than or equal to the lower limit value of the preset threshold value range and the ambient temperature is less than the first preset value;

When the heating module comprises a burner, the third anti-freezing action comprises controlling the circulating water pump to operate at a fifth rotating speed, and controlling the heating module to work and the fan to work; when the heating module only comprises an electric heating module, the third anti-freezing action comprises controlling the circulating water pump to operate at a fifth rotating speed and controlling the heating module to work; the second preset value is larger than the first preset value, and the fifth rotating speed is larger than the third rotating speed.

When the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold value range, the freezing risk on the pipeline is high, and if the ambient temperature is lower than the first preset value, water circulation control is needed to be performed at a rotation speed larger than the third rotation speed, water flow is accelerated, the heating module is started to heat water in the internal circulation waterway, so that freezing protection is realized, in view of the fact that the ambient temperature is low, the pipeline is quickly involved in the freezing risk after the heating is stopped, and the third freezing action is stopped until the water temperature of the internal circulation waterway is larger than the second preset value (larger than the first preset value), so that the heating module and the circulating water pump are prevented from being started frequently.

In one embodiment, when the water temperature of the internal circulation waterway is less than or equal to the lower limit value of the preset threshold range and the ambient temperature is less than the first preset value, the third anti-freezing action is performed until the water temperature of the internal circulation waterway is greater than the second preset value, including:

And under the condition that the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold range and the ambient temperature is smaller than the first preset value, controlling the circulating water pump to operate at a fifth rotating speed and controlling the heating module to work until the water temperature of the internal circulation waterway acquired by at least two different temperature acquisition points on the internal circulation waterway is larger than the second preset value.

Through carrying out the temperature monitoring at a plurality of acquisition points of inner loop water route, can be when the temperature of the inner loop water route of a plurality of acquisition points all is greater than the second default, consider to have got rid of the pipeline and have frozen the risk, can avoid closing heating module and circulating water pump in advance because of the inhomogeneous water temperature distribution in pipeline to improve the water heater reliability of preventing frostbite.

In one embodiment, an antifreezing control device is provided and applied to a gas water heater, wherein the gas water heater comprises a cold water pipe, a hot water pipe, a bypass pipe, a backwater control valve, a heat exchanger, a fan, a circulating water pump and a heating module; the water return end of the bypass pipe is communicated with the water return port on the cold water pipe, the water inlet end of the bypass pipe is communicated with the water return port on the hot water pipe, and the water outlet end of the cold water pipe and the water inlet end of the hot water pipe are respectively communicated with the heat exchanger to form an internal circulation waterway; the backwater control valve is arranged on the internal circulation water path and is used for switching on or off the bypass pipe; the circulating water pump is arranged on the internal circulating water path; the heating module is used for heating water in the internal circulation waterway; the device comprises:

the temperature acquisition module is used for acquiring the water temperature of the internal circulation waterway and the ambient temperature in a standby state;

The anti-freezing execution module is used for controlling the backwater control valve to be in a state of being communicated with the internal circulation waterway under the condition that the water temperature of the internal circulation waterway does not exceed the upper limit value of the preset threshold value range, and executing anti-freezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold value range and a second comparison result of the ambient temperature and the first preset value;

According to the anti-freezing control device provided by the invention, the water temperature detection result of the internal circulation water path and the environment temperature detection result are combined by setting the preset threshold range which is larger than 0 and the first preset value which is larger than the upper limit value of the preset threshold range, and when the temperature on the internal circulation water path does not exceed the upper limit value of the preset threshold range, the internal circulation water path is started, so that conditions are provided for pre-heating and anti-freezing, and further, the water temperature of the internal circulation water path and the environment temperature are comprehensively considered, the working states of the circulating water pump, the fan and the heating module are determined based on the first comparison result and the second comparison result which can be used for representing the two, so that the heat energy of the environment can be effectively utilized, the frequent starting of the heating module is reduced, and the energy consumption in the anti-freezing control process is reduced.

A controller comprising a memory storing a computer program and a processor implementing the steps of the above method when the processor executes the computer program.

The controller provided by the application can reduce energy consumption while realizing anti-freezing protection when being applied to a water heater product by executing the steps of the anti-freezing control method.

A gas water heater comprising: the device comprises a cold water pipe, a hot water pipe, a bypass pipe, a backwater control valve, a heat exchanger, a fan, a circulating water pump, a heating module, a first temperature sensor, a second temperature sensor and a controller;

The water return end of the bypass pipe is communicated with the water return port on the cold water pipe, the water inlet end of the bypass pipe is communicated with the water return port on the hot water pipe, and the water outlet end of the cold water pipe and the water inlet end of the hot water pipe are respectively communicated with the heat exchanger to form an internal circulation waterway;

the backwater control valve is arranged on the internal circulation water path and is used for switching on or off the bypass pipe;

the circulating water pump is arranged on the internal circulating water path;

The heating module is used for heating water in the internal circulation waterway;

The first temperature sensor is arranged on the internal circulation water path and used for acquiring the water temperature of the internal circulation water path;

the second temperature sensor is used for acquiring the ambient temperature;

the controller is respectively connected with the first temperature sensor, the second temperature sensor, the backwater control valve, the fan and the heating module, and the controller is used for executing the steps of the method.

The temperature detection is carried out through the first temperature sensor and the second temperature sensor, and the controller can acquire the water temperature and the ambient temperature of the internal circulation waterway in real time based on the connection relation between the first temperature sensor and the second temperature sensor. When the temperature on the internal circulation water path does not exceed the upper limit value of the preset threshold value range, the internal circulation water path is started to provide conditions for freezing prevention, the water temperature of the internal circulation water path and the environment temperature are comprehensively considered, the working states of the circulating water pump, the fan and the heating module are determined based on a first comparison result and a second comparison result which can be characterized, and the heat energy of the environment can be effectively utilized based on the heat exchanger, so that the frequent starting of the heating module is reduced, and the energy consumption in the freezing prevention control process is reduced.

In one embodiment, the return water control valve includes:

The bypass end of the electromagnetic three-way valve is communicated with the bypass pipe, the water inlet end of the electromagnetic three-way valve is communicated with the water inlet side of the hot water pipe, the water outlet end of the electromagnetic three-way valve is communicated with the water outlet side of the hot water pipe, and the controlled end of the electromagnetic three-way valve is electrically connected with the controller;

or the backwater control valve comprises:

And the electromagnetic valve is used for disconnecting or opening a communication passage of the hot water pipe connected with the cold water pipe through the bypass pipe.

The water inlet end and the bypass end of the electromagnetic three-way valve can be controlled to be communicated, so that the opening of an internal circulation waterway is realized, and the anti-freezing protection is carried out. Of course, the water outlet of the cold water pipe is communicated with the water return port of the cold water pipe through the electromagnetic valve and the bypass pipe, and an internal circulation water path can be formed, and at the moment, the opening and closing of the internal circulation water path can be realized by controlling the opening and closing state of the electromagnetic valve.

In one embodiment, the plurality of first temperature sensors is provided in a target location including at least two of a location where the heat exchanger is located, a location on the hot water pipe, and a location on the cold water pipe.

Through setting up first temperature sensor in a plurality of positions on the inner loop water circuit, can prevent to lead to the erroneous judgement in the anti-freezing execution process because of intraductal water temperature distribution is inhomogeneous to improve gas heater's anti-freezing protection reliability.

In one embodiment, the heating device comprises:

A burner; or alternatively, the first and second heat exchangers may be,

The electric heating module is arranged on the internal circulation water path.

The anti-freezing heating protection can be realized only based on the burner, the anti-freezing protection can be realized based on the burner and the electric heating module, the anti-freezing protection can be realized only based on the electric heating module, and the characteristic of low noise of the electric heating module is fully utilized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a gas water heater according to one embodiment;

FIG. 2 is a flow chart of an antifreeze control method according to one embodiment;

FIG. 3 is a second flow chart of an anti-freeze control method according to an embodiment;

FIG. 4 is a flowchart of step S420 in one embodiment;

FIG. 5 is a flowchart illustrating step S440 in one embodiment;

FIG. 6 is a block diagram of an antifreeze control apparatus according to an embodiment;

FIG. 7 is a schematic diagram of a portion of the internal structure of a controller in one embodiment.

Reference numerals illustrate:

1. A cold water pipe; 2. a hot water pipe; 3. a bypass pipe; 4. a backwater control valve; 41. an electromagnetic three-way valve; 411. a water inlet end; 412. a bypass end; 413. a water outlet end; 5. a heat exchanger; 6. a blower; 7. a circulating water pump; 8. a heating module; 81. a burner; 82. an electric heating module; 9. a first temperature sensor; 10. a second temperature sensor; 11. a controller; 12. a first one-way valve; 13. a water flow sensor; 14. an external circulation bypass; 15. and a second one-way valve.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

As described in the background art, the problem of high energy consumption exists in the anti-freezing protection implementation of the gas water heater in the prior art. In view of this, the invention provides an antifreezing control method, which is applied to a gas water heater 100 shown in fig. 1, wherein the gas water heater 100 comprises a cold water pipe 1, a hot water pipe 2, a bypass pipe 3, a backwater control valve 4, a heat exchanger 5, a fan 6, a circulating water pump 7 and a heating module 8; the water return end of the bypass pipe 3 is communicated with the water return port on the cold water pipe 1, the water inlet end of the bypass pipe 3 is communicated with the water return port on the hot water pipe 2, and the water outlet end of the cold water pipe 1 and the water inlet end of the hot water pipe 2 are respectively communicated with the heat exchanger 5 to form an internal circulation waterway; the backwater control valve 4 is arranged on the internal circulation water path and is used for switching on or off the bypass pipe 3; the circulating water pump 7 is arranged on the internal circulating water path, and the heating module is used for heating water in the internal circulating water path. As shown in fig. 2, the method includes:

S200: and in a standby state, acquiring the water temperature of the internal circulation waterway and the ambient temperature. The water temperature of the internal circulation water path can be collected and obtained based on the first temperature sensor 9 provided on the internal circulation water path. The number of the first temperature sensors 9 may be one or more, and in order to avoid the anti-freezing protection malfunction caused by the uneven water temperature distribution, the first temperature sensors 9 may be disposed at a plurality of different positions of the internal circulation waterway, for example, a position where the heat exchanger 5 is located, a position near the water inlet of the cold water pipe 1, a position near the water outlet of the hot water pipe 2, and the like.

The ambient temperature may be acquired and obtained based on the second temperature sensor 10. The number of the second temperature sensors 10 may be one or more, and when the number of the second temperature sensors 10 is plural, the second temperature sensors 10 may be disposed at different positions of the gas water heater 100, for example, at positions of an inner wall of the housing, an outer wall of the housing, etc., and at this time, the ambient temperature may be an average value of temperatures collected by the plurality of second temperature sensors 10. Of course, the second temperature sensor 10 may be one, and may be disposed inside or outside the housing of the gas water heater 100.

S400: and under the condition that the water temperature of the internal circulation waterway does not exceed the upper limit value of the preset threshold range, controlling the backwater control valve to be in a state of being communicated with the internal circulation waterway, and executing an antifreezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison result of the ambient temperature and the first preset value.

Wherein the anti-freezing action comprises controlling the circulating water pump and the fan to work, or controlling the circulating water pump, the fan and the heating module to work, or controlling the circulating water pump and the heating module to work; the first preset value is greater than the upper limit of the preset threshold range, and the lower limit of the preset threshold range is greater than 0. The lower limit value of the preset threshold range can be a temperature value of a pipeline which is at risk of freezing but not frozen, so the lower limit value of the preset threshold range is larger than 0 so as to avoid freezing the pipeline when the anti-freezing protection action is not performed. For example, the lower limit of the predetermined threshold range may be a temperature value in the range of 1-3 ℃.

The upper limit of the preset threshold range may be set to the highest temperature at which the anti-freeze protection is required, above which it is indicated that the pipeline is not at risk of freezing. For example, the upper limit of the predetermined threshold range may be a temperature value in the range of 4-8 ℃.

The first preset value is set to be a temperature value greater than the upper limit value of the preset threshold range, and the first preset value is selected based on a temperature value when the gas water heater is in an environment where the ambient temperature can provide more heat for the pipeline of the gas water heater to act on the pipeline for anti-freezing protection. For example, in one exemplary technique, the first preset value may be set to a temperature value within 10-20 ℃.

The state that the control backwater control valve is communicated with the internal circulation waterway can be understood that the backwater control valve is communicated with the hot water pipe, the bypass pipe and the cold water pipe at this time, water flows back to the cold water pipe after passing through the cold water pipe, the hot water pipe, the backwater control valve and the bypass pipe, namely, the water flows in the internal circulation waterway, and hot water in the hot water pipe circularly flows in the pipeline, so that the pipeline can be prevented from being frozen.

According to the anti-freezing control method provided by the embodiment of the application, the water temperature detection result of the internal circulation waterway and the environment temperature detection result are combined by setting the preset threshold range which is larger than 0 and the first preset value which is larger than the upper limit value of the preset threshold range, and when the temperature on the internal circulation waterway does not exceed the upper limit value of the preset threshold range, the internal circulation waterway is started to provide conditions for pre-heating and anti-freezing, and further, the water temperature of the internal circulation waterway and the environment temperature are comprehensively considered, the working states of the circulating water pump, the fan and the heating module are determined based on the first comparison result and the second comparison result which can be used for representing the two, so that the heat energy of the environment can be effectively utilized, the frequent starting of the heating module is delayed and reduced, and the energy consumption in the anti-freezing control process is reduced.

In one embodiment, as shown in fig. 3, a step S400 of performing an anti-freezing action based on a first comparison result of a water temperature of an internal circulation waterway and a preset threshold range and a second comparison result of an ambient temperature and a first preset value includes:

S420: and under the condition that the ambient temperature is greater than a first preset value, executing a first anti-freezing action, and stopping until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range, wherein the first anti-freezing action comprises controlling the fan to operate at a first rotating speed and controlling the circulating water pump to operate at a second rotating speed.

When the water temperature of the internal circulation waterway is in a preset threshold range and the ambient temperature is greater than a first preset value, the internal circulation waterway is possibly at risk of icing, the ambient temperature is higher, excessive heat can be used for anti-freezing protection of the water heater, at the moment, the fan is controlled to operate at a first rotating speed and the circulating water pump is controlled to operate at a second rotating speed, on one hand, the fan blows hot air of the environment where the water heater is positioned to the heat exchanger to exchange heat with water flow in the internal circulation waterway where the heat exchanger is positioned, heated water flows in the internal circulation waterway along with the operation of the circulating water pump, so that the water temperature of the internal circulation waterway is integrally increased, the process can be continued until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range, at the moment, the water temperature in the internal circulation waterway is indicated to reach the anti-freezing level, the circulating water pump and the fan can be controlled to stop working, and the step of acquiring the water temperature of the internal circulation waterway and the ambient temperature is achieved. The antifreezing control method provided by the embodiment of the application can delay the starting time of the heating module and save the energy consumption caused by starting the heating module while achieving the antifreezing purpose of the water heater.

In this case, the fan mainly performs the air flow control function, so that the fan can be operated at a low speed, and the noise is low. For example, the first rotational speed may be at a rotational speed within 600-2000 r/min.

In one embodiment, as shown in fig. 4, in the case that the ambient temperature is greater than the first preset value, the step S420 of performing the first anti-freezing operation until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range includes:

S422: continuously executing a first antifreezing action for a first time length;

s424: controlling the circulating water pump and the fan to stop running, and acquiring the water temperature and the environment temperature of the internal circulating water channel;

S426: if the water temperature of the internal circulation waterway is still in the preset threshold range and the ambient temperature is still greater than the first preset value within the second time length when the circulating water pump and the fan stop running, entering a step of continuously executing a first anti-freezing action for the first time length;

S428: if the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold value range in the second time length when the circulating water pump and the fan stop running, the circulating water pump and the fan are kept in a stop running state.

By intermittently controlling the circulating water pump and the fan to start, the electric energy consumed by the machine operation can be reduced while the antifreezing of the pipeline is ensured, frequent starting is avoided, and the energy consumption is reduced.

Wherein the first time period may be set to a time period within 30-120 seconds and the second time period may be set to a time period within 12-24 hours. For example, in cold regions where the ambient temperature is below 0 ℃ for a long period of time, the second time period may be set to 24 hours, in regions where the daytime temperature is above 0 ℃ and the evening temperature is below 0 ℃, the second time period may be set to 12 hours since the risk of icing of the pipeline mainly occurs in the evening.

S440: executing a second anti-freezing action when the water temperature of the internal circulation waterway is within a preset threshold range and the ambient temperature is smaller than a first preset value, and stopping the internal circulation waterway until the water temperature of the internal circulation waterway is larger than the upper limit value of the preset threshold range, wherein the second anti-freezing action comprises controlling the circulating water pump to operate at a third rotating speed or controlling the circulating water pump to operate at the third rotating speed and controlling the fan to operate at a fourth rotating speed;

Wherein, the third rotational speed is greater than the second rotational speed, and the second rotational speed is greater than first rotational speed, and it can be understood that along with the increase of the risk of freezing on the pipeline, circulating water pump rotational speed needs synchronous increase to accelerate the water velocity in the inner loop water route, make the hot water in the inner loop water route transmit to the cold water pipe fast, thereby accelerate the whole rising of the hot water's in the inner loop water route mixing speed and pipeline temperature, prevent that the pipeline from freezing.

When the ambient temperature is lower than a first preset value, the ambient temperature is lower at the moment, the temperature difference between the ambient temperature and the water temperature of the internal circulation waterway is smaller, the heat exchange effect of the starting fan is weaker, at the moment, the circulating water pump can be started only to enable water in the internal circulation waterway to flow, the water temperature of the internal circulation waterway is uniformly distributed all the time until the water temperature of the internal circulation waterway is higher than the upper limit value of the preset threshold range, at the moment, the pipeline is considered to be prevented from freezing, the anti-freezing purpose is realized, and the noise is extremely low because the circulating water pump is started only, and the fan and the heating device are not started.

When the ambient temperature is lower than a first preset value, the circulating water pump can be controlled to operate at a third rotating speed, the fan can be controlled to operate at a fourth lower rotating speed, the heat exchange speed is accelerated, the overall noise of the water heater is also in a low decibel, and the user experience is improved while the antifreezing is realized. For example, the fourth rotational speed may be in the range of 1000-3000 r/min. If the fan is to be started, the fan is operated at a speed greater than the first rotating speed, so that heat exchange between the ambient temperature and water flow in the internal circulation waterway is accelerated, and more heat is transferred to the water flow in the internal circulation waterway in unit time.

In one embodiment, as shown in fig. 5, in the case where the water temperature of the internal circulation waterway is within the preset threshold range and the ambient temperature is less than the first preset value, the step S440 of stopping until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range is performed includes:

s442: continuously executing the second anti-freezing action for a third time length;

s444: controlling the circulating water pump and the fan to stop running, and acquiring the water temperature and the environment temperature of the internal circulating water channel; it should be understood that if only the circulating water pump is started, controlling the fan to stop running can be understood as keeping the fan in a stopped state;

S446: if the water temperature of the internal circulation waterway is still in the preset threshold range and the ambient temperature is still less than or equal to the first preset value in the fourth time length when the circulating water pump and the fan stop running, entering a step of continuously executing a second anti-freezing action in the third time length;

s448: if the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold value range in the fourth time period when the circulating water pump and the fan stop running, the circulating water pump and the fan are kept in a stop running state.

The circulating water pump is controlled intermittently or the circulating water pump and the fan are controlled intermittently to start, so that the electric energy consumed by the machine operation can be reduced while the antifreezing of the pipeline is ensured, frequent starting is avoided, and the energy consumption is reduced.

Wherein the third time period may be set to a time period within 45-200 seconds and the fourth time period may be set to a time period within 6-18 hours.

In one embodiment, after step S420 and step S440, further includes:

and under the condition that the water temperature of the internal circulation waterway rises to be greater than the upper limit value of the preset threshold range, controlling the backwater control valve to be in a state of being communicated with the whole hot water pipe so as to enable the hot water pipe to flow towards the water end.

For example, in the case that the return water control valve is an electromagnetic three-way valve, a bypass end of the electromagnetic three-way valve is communicated with the bypass pipe, a water inlet end of the electromagnetic three-way valve is communicated with a water inlet side of the hot water pipe, a water outlet end of the electromagnetic three-way valve is communicated with a water outlet side of the hot water pipe, and a controlled end of the electromagnetic three-way valve is electrically connected with the controller. The control backwater control valve is in a state of being communicated with the whole hot water pipe, so that the control of the water inlet end and the water outlet end of the electromagnetic three-way valve can be understood as the control of the communication of the water inlet end and the water outlet end of the electromagnetic three-way valve.

When the backwater control valve is an electromagnetic valve, the electromagnetic valve is responsible for disconnecting or opening a communication passage of the hot water pipe connected with the cold water pipe through the bypass pipe. The control of the backwater control valve is in a state of being communicated with the whole hot water pipe, so that the control of the electromagnetic valve can be understood as that the electromagnetic valve cuts off a connecting passage of the hot water pipe connected with the cold water pipe through the bypass pipe, so that hot water flows to the water use end.

In one embodiment, the step S400 of performing the anti-freezing action based on a first comparison result of the water temperature of the internal circulation waterway and a preset threshold range and a second comparison result of the ambient temperature and a first preset value includes:

S460: and under the condition that the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold range and the ambient temperature is smaller than the first preset value, executing the third anti-freezing action until the water temperature of the internal circulation waterway is larger than the second preset value.

In one embodiment, when the water temperature of the internal circulation waterway is less than or equal to the lower limit value of the preset threshold range and the ambient temperature is less than the first preset value, the step S460 of executing the third anti-freezing action until the water temperature of the internal circulation waterway is greater than the second preset value includes:

And under the condition that the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold value range and the ambient temperature is smaller than the first preset value, controlling the circulating water pump to operate at a fifth rotating speed and controlling the heating module to work until the water temperature of the internal circulation waterway acquired by at least two different temperature acquisition points on the internal circulation waterway is larger than the second preset value.

In one embodiment, the second predetermined value may be a temperature value within 15-35 ℃. Of course, in different regions, the value range of the second preset value can also be correspondingly adjusted.

In one embodiment, after step S460, the method further includes:

and under the condition that the water temperature of the internal circulation waterway rises to be greater than a second preset value, controlling the backwater control valve to be in a state of communicating the hot water pipe with the water use end and closing the internal circulation waterway.

In order to better illustrate the implementation process of the anti-freezing control method provided by the embodiment of the application, the return water control valve is an electromagnetic three-way valve under the structure shown in fig. 1, and the method can be executed by a controller in a gas water heater, and specifically comprises the following steps:

When the temperature T of an internal circulation waterway collected by one temperature sensor on the internal circulation waterway (which can comprise the water inlet temperature collected by the temperature sensor on the cold water pipe, the water outlet temperature collected by the temperature sensor on the hot water pipe and the temperature collected by the temperature sensor at the heat exchanger) is less than or equal to T1 and greater than T2 (namely, within a preset threshold range), the controller controls the water inlet end and the bypass end of the electromagnetic three-way valve to be communicated so as to realize the communication between the hot water pipe and the cold water pipe through the bypass pipe, thereby forming the internal circulation waterway. At this time, if the ambient temperature T _Ring(s) detected by the ambient temperature sensor is greater than the first preset value T0, the controller controls the fan to operate at a low speed of the first speed V0, the circulating water pump operates at a low speed of the second speed V1, so as to achieve the water circulation flow in the internal circulating waterway, the fan and the circulating water pump stop operating after operating for a first time period S1, and the controller detects in real time whether the water temperature T and the ambient temperature T _Ring(s) of the internal circulating waterway are within the preset threshold range, if so, controls the fan and the circulating water pump to operate for a long period S1 every interval of the second time period Y1, wherein T0 is greater than T1, and T2 is greater than zero. The heat exchange is carried out by fully utilizing the temperature difference between the ambient temperature T _Ring(s) and the internal circulation waterway, and the anti-freezing protection is realized under the condition of low energy consumption. For example, when the gas water heater is installed in a room with heating conditions, the temperature difference between the indoor temperature and the outdoor temperature is larger at the moment, and when the fan is started, the indoor hot air can be blown to the heat exchanger to exchange heat with the water flow of the heat exchanger pipeline, so that the water temperature of the internal circulation waterway is increased, the anti-freezing purpose of the gas water heater is achieved, the starting time of the heating module can be delayed, and the energy consumption caused by starting the heating module is saved.

When the water temperature T of the internal circulation waterway is smaller than or equal to T1 and larger than T2, the controller controls the water inlet end and the bypass end of the electromagnetic three-way valve to be communicated so that the hot water pipe and the cold water pipe are communicated through the internal circulation waterway to form an internal circulation independent waterway, or controls the electromagnetic valve to be opened to realize the communication of the hot water pipe and the cold water pipe. At this time, if the ambient temperature T _Ring(s) detected by the ambient temperature sensor is less than T0, the controller controls the circulating water pump to operate at a third rotation speed V2 with a low rotation speed, so as to realize the water circulation flow in the internal circulation waterway, and the circulating water pump stops operating after operating for a third time length S2. The controller detects whether the temperature T and the ambient temperature T _Ring(s) are within the set value range in real time, and if so, controls the circulating water pump to run for S2 time after every fourth time length Y2.

At this time, the ambient temperature T _Ring(s) is lower, the temperature difference between the ambient temperature T _Ring(s) and the internal circulation waterway is smaller, the heat exchange effect of the starting fan is not very good, and the water temperature of each part in the internal circulation waterway can be uniformly distributed by only starting the circulating water pump to promote the water flow of the internal circulation waterway, so that the noise caused by freezing is reduced while the occurrence of freezing is avoided. Of course, the fan can be controlled to operate at a fourth rotating speed V3 with a low rotating speed, wherein the rotating speed V3 is 1000-3000r/min, and the rotating speed V3 is larger than the rotating speed V0, namely, the fan can be operated at a low speed or not operated at a low speed, and the influence is small.

When the water temperature T of the internal circulation waterway is less than or equal to T2 and the ambient temperature T _Ring(s) is less than T0, the controller controls the water inlet end and the bypass end of the electromagnetic three-way valve to be communicated so that the hot water pipe and the cold water pipe are communicated through the internal circulation waterway to form an internal circulation independent waterway, or controls the electromagnetic valve to be opened to realize the communication of the hot water pipe and the cold water pipe. At this time, the controller controls the heating module to work and controls the circulating water pump to run at a fifth rotating speed V4 so as to realize the circulating heating of water in the internal circulating water channel, and when the temperature detected by at least two temperature sensors arranged on the internal circulating water channel is more than or equal to a second preset value T3, the controller controls the circulating water pump to stop circulating heating and controls the heating module to stop working.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides an anti-freezing control device for realizing the anti-freezing control method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of one or more anti-freezing control devices provided below may be referred to the limitation of the anti-freezing control method hereinabove, and will not be repeated here.

In one embodiment, as shown in fig. 6, an antifreezing control device is provided, and is applied to a gas water heater, wherein the gas water heater comprises a cold water pipe, a hot water pipe, a bypass pipe, a backwater control valve, a heat exchanger, a fan, a circulating water pump and a heating module; the water return end of the bypass pipe is communicated with the water return port on the cold water pipe, the water inlet end of the bypass pipe is communicated with the water return port on the hot water pipe, and the water outlet end of the cold water pipe and the water inlet end of the hot water pipe are respectively communicated with the heat exchanger to form an internal circulation waterway; the backwater control valve is arranged on the internal circulation water path and is used for switching on or off the bypass pipe; the circulating water pump is arranged on the internal circulating water path; the heating module is used for heating water in the internal circulation waterway.

The antifreeze control device includes: a temperature acquisition module 620, and an anti-freeze execution module 640.

The temperature obtaining module 620 is configured to obtain the water temperature of the internal circulation water path and the ambient temperature in the standby state. The anti-freezing execution module 640 is configured to control the backwater control valve to be in a state of being communicated with the internal circulation waterway when the water temperature of the internal circulation waterway does not exceed the upper limit value of the preset threshold range, and execute an anti-freezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison result of the ambient temperature and the first preset value.

According to the anti-freezing control device provided by the embodiment of the application, the water temperature detection result of the internal circulation water path and the environment temperature detection result are combined by setting the preset threshold range which is larger than 0 and the first preset value which is larger than the upper limit value of the preset threshold range, when the temperature on the internal circulation water path does not exceed the upper limit value of the preset threshold range, the internal circulation water path is started by the anti-freezing execution module, and the conditions for pre-heating and anti-freezing are provided, and further, the water temperature of the internal circulation water path and the environment temperature are comprehensively considered, the working states of the circulating water pump, the fan and the heating module are determined based on the first comparison result and the second comparison result which can represent the two conditions, so that the heat energy of the environment can be effectively utilized, the frequent starting of the heating module is reduced, and the energy consumption in the anti-freezing control process is reduced.

In one embodiment, an antifreeze execution module includes:

The first anti-freezing execution unit is used for executing a first anti-freezing action under the condition that the ambient temperature is greater than a first preset value, and stopping the operation until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range, wherein the first anti-freezing action comprises controlling the fan to operate at a first rotating speed and controlling the circulating water pump to operate at a second rotating speed.

In one embodiment, the first freeze protection execution unit comprises:

the first heating unit is used for continuously executing a first antifreezing action for a first time length;

the first monitoring unit is used for controlling the circulating water pump and the fan to stop running and acquiring the water temperature and the environmental temperature of the internal circulating waterway;

The first circulation execution unit is used for entering the step of continuously executing the first anti-freezing action for the first time length under the condition that the water temperature of the internal circulation waterway is still in the preset threshold range and the ambient temperature is still greater than the first preset value within the second time length of stopping the operation of the circulating water pump and the fan;

and the first heating stopping unit is used for keeping the circulating water pump and the fan in a stop operation state if the water temperature of the internal circulating water channel is larger than the upper limit value of the preset threshold value range within the second time length of stopping operation of the circulating water pump and the fan.

In one embodiment, an antifreeze execution module includes:

The second anti-freezing execution unit is used for executing a second anti-freezing action when the water temperature of the internal circulation waterway is within a preset threshold range and the ambient temperature is smaller than a first preset value, and stopping the internal circulation waterway until the water temperature of the internal circulation waterway is larger than the upper limit value of the preset threshold range, wherein the second anti-freezing action comprises controlling the circulating water pump to operate at a third rotating speed or controlling the circulating water pump to operate at the third rotating speed and controlling the fan to operate at a fourth rotating speed;

In one embodiment, the second freeze protection execution unit comprises:

a second heating unit for continuously performing a second freezing prevention action for a third length of time;

The second monitoring unit is used for controlling the circulating water pump and the fan to stop running and acquiring the water temperature and the environmental temperature of the internal circulating water channel; it should be understood that if only the circulating water pump is started, controlling the fan to stop running can be understood as keeping the fan in a stopped state;

The second circulation execution unit is used for entering the step of continuously executing the second anti-freezing action by the third time length under the condition that the water temperature of the internal circulation waterway is still in the preset threshold range and the ambient temperature is still smaller than or equal to the first preset value in the fourth time length when the circulating water pump and the fan stop running;

And the second heating stopping unit is used for keeping the circulating water pump and the fan in a stop operation state under the condition that the water temperature of the internal circulating water channel is larger than the upper limit value of the preset threshold range in the fourth time period of stopping operation of the circulating water pump and the fan.

In one embodiment, the antifreeze control apparatus further comprises:

the first stopping module is used for controlling the backwater control valve to be in a state of communicating the hot water pipe with the water using end and closing the internal circulation waterway under the condition that the water temperature of the internal circulation waterway rises to be greater than the upper limit value of the preset threshold range.

In one embodiment, an antifreeze execution module includes:

The third anti-freezing execution unit is used for executing a third anti-freezing action when the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold value range and the ambient temperature is smaller than the first preset value, and stopping until the water temperature of the internal circulation waterway is larger than the second preset value;

when the heating module comprises a burner, the third anti-freezing action comprises controlling the circulating water pump to operate at a fifth rotating speed, and controlling the heating module to work and the fan to work; when the heating module only comprises an electric heating module, the third anti-freezing action comprises controlling the circulating water pump to operate at a fifth rotating speed and controlling the heating module to work; the second preset value is greater than the first preset value.

In one embodiment, the third freeze protection execution unit comprises:

The low-temperature anti-freezing execution unit is used for controlling the circulating water pump to operate at a fifth rotating speed and controlling the heating module to work under the condition that the water temperature of the internal circulating water channel is smaller than or equal to the lower limit value of the preset threshold value range and the ambient temperature is smaller than the first preset value, until the water temperature of the internal circulating water channel acquired by at least two different temperature acquisition points on the internal circulating water channel is larger than the second preset value.

In one embodiment, the antifreeze control apparatus further comprises:

And the second stopping module is used for controlling the backwater control valve to be in a state of communicating the hot water pipe with the water using end and closing the internal circulation waterway under the condition that the water temperature of the internal circulation waterway rises to be greater than a second preset value.

The respective modules in the above-described antifreeze control apparatus may be realized in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the controller, or may be stored in software in a memory in the controller, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a controller is provided, which may be a control chip, a single chip microcomputer, etc., and the internal structure diagram thereof may be as shown in fig. 7. The controller includes a processor, a memory, a communication interface, and an input device connected by a system bus. Wherein the processor of the controller is configured to provide computing and control capabilities. The memory of the controller includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the controller is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements an antifreeze control method. The controller can be further provided with a display screen, the display screen can be a liquid crystal display screen or an electronic ink display screen, the controller can be arranged on the outer wall of a shell of the gas water heater or the shell of the gas water heater in an embedded mode, and the input device of the controller can be a touch layer covered on the display screen.

It will be appreciated by those skilled in the art that the structure shown in fig. 7 is merely a block diagram of a portion of the structure associated with the present inventive arrangements and is not limiting of the controller to which the present inventive arrangements are applied, and that a particular controller may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a controller is provided, including a memory and a processor, the memory storing a computer program, the processor implementing the steps of the antifreeze control method described above and achieving corresponding advantageous effects when executing the computer program.

The controller provided by the application can reduce energy consumption, noise and user experience when being applied to a water heater product by executing the steps of the anti-freezing control method.

A gas water heater 100 comprising: cold water pipe 1, hot water pipe 2, bypass pipe 3, return water control valve 4, heat exchanger 5, fan 6, circulating water pump 7, heating module 8, first temperature sensor 9, second temperature sensor 10 and controller 11.

Wherein, the backwater end of the bypass pipe 3 is communicated with the backwater port on the cold water pipe 1, the water inlet end 411 of the bypass pipe 3 is communicated with the backwater port on the hot water pipe 2, and the water outlet end of the cold water pipe 1 and the water inlet end of the hot water pipe 2 are respectively communicated with the heat exchanger 5 to form an internal circulation waterway. The circulating water pump 7 is arranged on the internal circulating water path. The heating module 8 is used for heating water in the internal circulation waterway.

The first temperature sensor 9 is arranged on the internal circulation water path and is used for acquiring the water temperature of the internal circulation water path. The second temperature sensor 10 is used to acquire the ambient temperature.

The controller 11 is connected with the first temperature sensor 9, the second temperature sensor 10, the backwater control valve 4, the fan 6 and the heating module 8, respectively, and the controller 11 is used for executing the steps of the method.

The first temperature sensor 9 and the second temperature sensor 10 are used for detecting the temperature, and the controller 11 can acquire the water temperature and the ambient temperature of the internal circulation waterway in real time based on the connection relation between the first temperature sensor 9 and the second temperature sensor 10. When the temperature on the internal circulation water path does not exceed the upper limit value of the preset threshold value range, the internal circulation water path is started to provide conditions for preheating and freezing prevention, further, the water temperature of the internal circulation water path and the environment temperature are comprehensively considered, the working states of the circulating water pump 7, the fan 6 and the heating module 8 are determined based on a first comparison result and a second comparison result which can be characterized, and the heat energy of the environment can be effectively utilized based on the heat exchanger 5, so that the frequent starting of the heating module 8 is reduced, and the energy consumption in the freezing prevention control process is reduced.

In one embodiment, the return water control valve 4 includes:

The electromagnetic three-way valve 41, the bypass end 412 of the electromagnetic three-way valve 41 is communicated with the bypass pipe 3, the water inlet end 411 of the electromagnetic three-way valve 41 is communicated with the water inlet side of the hot water pipe 2, the water outlet end 413 of the electromagnetic three-way valve 41 is communicated with the water outlet side of the hot water pipe 2, and the controlled end of the electromagnetic three-way valve 41 is electrically connected with the controller 11;

Or, the return water control valve 4 includes:

A solenoid valve 42 for opening or shutting off a communication path of the hot water pipe 2 connected to the cold water pipe 1 through the bypass pipe 3.

The water inlet end 411 and the bypass end 412 of the electromagnetic three-way valve 41 can be controlled to be communicated so as to realize the opening of an internal circulation waterway and perform anti-freezing protection.

Optionally, the water outlet of the cold water pipe 1 is communicated with the water return port of the cold water pipe 1 through the electromagnetic valve 42 and the bypass pipe 3, and an internal circulation water path can be formed, and at the moment, the opening and closing of the internal circulation water path can be realized by controlling the opening and closing state of the electromagnetic valve 42.

In one embodiment, the first temperature sensors 9 are plural, and the plural first temperature sensors 9 are provided at target positions including at least two of the position where the heat exchanger 5 is located, the position on the hot water pipe 2, and the position on the cold water pipe 1.

By arranging the first temperature sensors 9 at a plurality of positions on the internal circulation water path, erroneous judgment in the anti-freezing execution process caused by uneven water temperature distribution in the pipe can be prevented, and thus the anti-freezing protection reliability of the gas water heater is improved.

In one embodiment, the heating device comprises:

A burner 81; or alternatively, the first and second heat exchangers may be,

The burner 81 and the electric heating module 82, the electric heating module 82 is disposed on the inner circulation water path.

The anti-freezing heating protection can be realized only based on the burner 81, the anti-freezing protection can be realized based on the burner 81 and the electric heating module 82, the anti-freezing protection can be realized only based on the electric heating module 82, and the characteristic of low noise of the electric heating module 82 is fully utilized.

In one embodiment, the bypass pipe 3 is provided with a first non-return valve 12, the first non-return valve 12 being adapted to allow water flow from the hot water pipe 2 to the cold water pipe 1 via the bypass pipe 3 and to prevent water flow from the cold water pipe 1 to the hot water pipe 2 via the bypass pipe 3.

In one embodiment, in the gas water heater, the cold water pipe 1 is further provided with a water flow sensor 13, and the water flow sensor 13 transmits acquired water inflow data to the controller 11 so that the controller 11 can adjust the rotation speed of the circulating water pump 7.

In one embodiment, the gas water heater further comprises an external circulation bypass 14, the water inlet end of the external circulation bypass 14 is communicated with the hot water pipe 2, and the water return end of the external circulation bypass 14 is communicated with the cold water pipe 1. Optionally, the outer circulation bypass 14 may be further provided with a second check valve 15. The second one-way valve allows water in the hot water pipe 2 to flow to the cold water pipe 1 via the outer circulation bypass 14 and prevents water in the cold water pipe 1 from flowing to the hot water pipe 2 via the outer circulation bypass 14.

In one embodiment, a computer readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the above-described antifreeze control method and achieves the corresponding advantageous effects.

In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the above-described antifreeze control method and achieves corresponding advantageous results.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. The anti-freezing control method is characterized by being applied to a gas water heater, wherein the gas water heater comprises a cold water pipe, a hot water pipe, a bypass pipe, a backwater control valve, a heat exchanger, a fan, a circulating water pump and a heating module; the water return end of the bypass pipe is communicated with the water return opening on the cold water pipe, the water inlet end of the bypass pipe is communicated with the water return opening on the hot water pipe, and the water outlet end of the cold water pipe and the water inlet end of the hot water pipe are respectively communicated with the heat exchanger to form an internal circulation waterway; the backwater control valve is arranged on the internal circulating water path and is used for switching on or off the bypass pipe; the circulating water pump is arranged on the internal circulating water path; the heating module is used for heating water in the internal circulation waterway; the method comprises the following steps:

Controlling the backwater control valve to be in a state of being communicated with the internal circulation waterway under the condition that the water temperature of the internal circulation waterway does not exceed the upper limit value of a preset threshold range, and executing an antifreezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison result of the environmental temperature and the first preset value;

wherein the anti-freezing action comprises controlling the circulating water pump and the fan to work, or controlling the circulating water pump, the fan and the heating module to work, or controlling the circulating water pump and the heating module to work; the first preset value is larger than the upper limit value of the preset threshold range, and the lower limit value of the preset threshold range is larger than 0.

2. The method of claim 1, wherein performing an anti-freeze action based on a first comparison of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison of the ambient temperature and a first preset value comprises:

And under the condition that the ambient temperature is greater than the first preset value, executing a first anti-freezing action until the water temperature of the internal circulation waterway is greater than the upper limit value of the preset threshold range, wherein the first anti-freezing action comprises controlling the fan to operate at a first rotating speed and controlling the circulating water pump to operate at a second rotating speed.

3. The method of claim 1, wherein performing an anti-freeze action based on a first comparison of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison of the ambient temperature and a first preset value comprises:

executing a second anti-freezing action when the water temperature of the internal circulation water path is within the preset threshold range and the ambient temperature is smaller than the first preset value, until the water temperature of the internal circulation water path is larger than the upper limit value of the preset threshold range, wherein the second anti-freezing action comprises controlling the circulating water pump to operate at a third rotating speed or controlling the circulating water pump to operate at the third rotating speed and controlling the fan to operate at a fourth rotating speed;

4. The method of claim 1, wherein performing an anti-freeze action based on a first comparison of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison of the ambient temperature and a first preset value comprises:

Executing a third anti-freezing action when the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold value range and the ambient temperature is smaller than the first preset value, and stopping until the water temperature of the internal circulation waterway is larger than a second preset value;

When the heating module comprises a combustor, the third antifreezing action comprises controlling the circulating water pump to operate at a fifth rotating speed, and controlling the heating module to work and the fan to work; when the heating module only comprises an electric heating module, the third anti-freezing action comprises controlling the circulating water pump to operate at the fifth rotating speed and controlling the heating module to work; the second preset value is greater than the first preset value.

5. The method according to claim 4, wherein the performing a third freeze protection action in a case where the water temperature of the internal circulation waterway is equal to or less than a lower limit value of the preset threshold range and the ambient temperature is less than the first preset value until the water temperature of the internal circulation waterway is greater than a second preset value, comprises:

and under the condition that the water temperature of the internal circulation waterway is smaller than or equal to the lower limit value of the preset threshold range and the ambient temperature is smaller than the first preset value, controlling the circulating water pump to operate at a fifth rotating speed and controlling the heating module to work until the water temperature of the internal circulation waterway collected by at least two different temperature collection points on the internal circulation waterway is larger than the second preset value.

6. The anti-freezing control device is characterized by being applied to a gas water heater, wherein the gas water heater comprises a cold water pipe, a hot water pipe, a bypass pipe, a backwater control valve, a heat exchanger, a fan, a circulating water pump and a heating module; the water return end of the bypass pipe is communicated with the water return opening on the cold water pipe, the water inlet end of the bypass pipe is communicated with the water return opening on the hot water pipe, and the water outlet end of the cold water pipe and the water inlet end of the hot water pipe are respectively communicated with the heat exchanger to form an internal circulation waterway; the backwater control valve is arranged on the internal circulating water path and is used for switching on or off the bypass pipe; the circulating water pump is arranged on the internal circulating water path; the heating module is used for heating water in the internal circulation waterway; the device comprises:

The anti-freezing execution module is used for controlling the backwater control valve to be in a state of being communicated with the internal circulation waterway under the condition that the water temperature of the internal circulation waterway does not exceed the upper limit value of the preset threshold range, and executing anti-freezing action based on a first comparison result of the water temperature of the internal circulation waterway and the preset threshold range and a second comparison result of the environmental temperature and the first preset value;

7. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.

8. A gas water heater, comprising: the device comprises a cold water pipe (1), a hot water pipe (2), a bypass pipe (3), a backwater control valve (4), a heat exchanger (5), a fan (6), a circulating water pump (7), a heating module (8), a first temperature sensor (9), a second temperature sensor (10) and a controller (11);

The water return end of the bypass pipe (3) is communicated with the water return port on the cold water pipe (1), the water inlet end of the bypass pipe (3) is communicated with the water return port on the hot water pipe (2), and the water outlet end of the cold water pipe (1) and the water inlet end of the hot water pipe (2) are respectively communicated with the heat exchanger (5) to form an internal circulation waterway;

the backwater control valve (4) is arranged on the internal circulating water path and is used for switching on or off the bypass pipe (3);

the circulating water pump (7) is arranged on the internal circulating water path;

the heating module (8) is used for heating water in the internal circulation waterway;

the first temperature sensor (9) is arranged on the internal circulation water path and is used for acquiring the water temperature of the internal circulation water path;

The second temperature sensor (10) is used for acquiring the ambient temperature;

The controller (11) is connected to the first temperature sensor (9), the second temperature sensor (10), the return water control valve (4), the fan (6) and the heating module (8), respectively, and the controller (11) is adapted to perform the steps of the method according to any one of claims 1 to 5.

9. The gas water heater according to claim 8, wherein the return water control valve (4) comprises:

An electromagnetic three-way valve (41), wherein a bypass end (412) of the electromagnetic three-way valve (41) is communicated with the bypass pipe (3), a water inlet end (411) of the electromagnetic three-way valve (41) is communicated with the water inlet side of the hot water pipe (2), a water outlet end (413) of the electromagnetic three-way valve (41) is communicated with the water outlet side of the hot water pipe (2), and a controlled end of the electromagnetic three-way valve (41) is electrically connected with the controller (11);

or the backwater control valve (4) comprises:

and the electromagnetic valve (42) is used for disconnecting or opening a communication passage of the hot water pipe (2) connected with the cold water pipe (1) through the bypass pipe (3).

10. The gas water heater according to claim 8, wherein the first temperature sensor (9) is provided in a plurality, the plurality of first temperature sensors (9) being provided at target locations including at least two of a location of the heat exchanger (5), a location on the hot water pipe (2) and a location on the cold water pipe (1).

11. Gas water heater according to claim 8, characterized in that said heating means (8) comprise:

A burner (81); or alternatively, the first and second heat exchangers may be,

A burner (81) and an electric heating module (82), the electric heating module (82) being arranged on the internal circulation water path.