CN115900068A - Anti-freezing gas water heater and control method thereof - Google Patents

Abstract

The invention relates to an anti-freezing gas water heating device and a control method thereof, wherein the anti-freezing gas water heating device comprises: the device comprises a main heat exchanger, a cold water joint pipe, a cold water inlet pipe, a water return pipeline, a hot water outlet pipe, a hot water joint pipe, a phase change heat storage module, a water flow sensor, a combustor, a water pump and a controller. When judging that gas hot water system prevents frostbite is standby mode, the controller can control the water pump and start with less rotational speed, realize the water source through the cold water inlet tube under the drive power effect of water pump, main heat exchanger, the route circulation flow that hot water outlet pipe and return water pipeline formed, the heat energy that just can realize through phase transition heat-retaining module among the circulation flow process plays frostbite, need not to open the combustor, also need not to adopt the electrical heating stick to heat the pipeline, only need open the water pump can, the during operation noise of water pump is less than the noise of combustor during operation greatly, can reduce the combustion noise, and the cost is lower.

Description

Anti-freezing gas water heater and control method thereof

Technical Field

The invention relates to a water heating device, in particular to an anti-freezing gas water heating device and a control method thereof.

Background

The gas water heater is a device for preparing hot water by using high-temperature flue gas generated by gas combustion, is popular among users due to the convenience of preparing hot water, and is widely used. Generally, a gas water heater is installed in a balcony or a kitchen to provide hot water for life, and when the external environment temperature is low, especially in cold winter or in cold weather regions, the risk that the internal pipeline water of the gas water heater is frozen and frozen is present, and further damage is generated to the gas water heater, which also affects the normal use of a user. In order to avoid the pipeline of the gas water heating device from being frozen, frequent ignition is usually needed to start the burner, so that hot water circulates in the gas water heating device to heat the pipeline, the pipeline is prevented from being frozen and broken, however, the burner generates large combustion noise during operation, and meanwhile, the energy consumption is large. The traditional gas water heating device is provided with an electric heating rod to heat a pipeline through frequently enabling the electric heating rod, however, the energy consumption is large, the cost is high, the capacity of an electric heating anti-freezing mode of a non-zero water chiller type is limited, and the reliability of an additional heating mode is also greatly influenced by external environment change and is easy to lose efficacy.

Disclosure of Invention

The first technical problem solved by the invention is to provide an anti-freezing gas water heating device which can effectively reduce noise, save energy consumption and improve reliability.

The second technical problem to be solved by the present invention is to provide a control method for an anti-freezing gas water heater, which can effectively reduce noise, save energy consumption and improve reliability.

The first technical problem is solved by the following technical scheme:

an antifreeze gas hot water apparatus, comprising:

the heat exchanger comprises a main heat exchanger, a cold water joint pipe, a cold water inlet pipe, a water return pipeline, a hot water outlet pipe and a hot water joint pipe, wherein the cold water joint pipe is communicated with the cold water inlet pipe, the cold water inlet pipe is communicated with the water inlet end of the main heat exchanger, the water outlet end of the main heat exchanger is communicated with the water inlet end of the hot water outlet pipe, the water outlet end of the hot water outlet pipe is communicated with the hot water joint pipe, one end of the water return pipeline is communicated with the water outlet end of the hot water outlet pipe, and the other end of the water return pipeline is communicated with the cold water joint pipe;

the phase-change heat storage module is arranged on the hot water outlet pipe in series;

the water flow sensor is arranged on the cold water inlet pipe, the cold water joint pipe, the hot water outlet pipe or the hot water joint pipe;

the burner heats the main heat exchanger when working, and the water pump is arranged on the cold water inlet pipe in series; the controller is electrically connected with the combustor, the water pump and the water flow sensor respectively; the controller is used for controlling the water pump to work and controlling the burner to work according to the water flow signals sensed by the water flow sensor.

Compared with the background art, the antifreezing gas water heater provided by the invention has the beneficial effects that:

according to the anti-freezing gas water heating device, the water flow inductor is used for inducing the water flow and transmitting the induced water flow signal to the controller, and the controller can correspondingly judge whether the anti-freezing gas water heating device is in a normal water use mode or a standby mode and can correspondingly control the water pump and the burner to work. When the anti-freezing gas water heating device is judged to be in a standby mode (namely, a user does not use a water source of the anti-freezing gas water heating device in the standby mode, and an external water source does not enter the anti-freezing gas water heating device), the controller can control the water pump to be started at a lower rotating speed, and the water source can circularly flow through a passage formed by the cold water inlet pipe, the main heat exchanger, the hot water outlet pipe and the water return pipeline under the driving force of the water pump; in addition, in the standby working mode, when the stored heat energy of the phase-change heat storage module is not enough to resist the external cold environment, the controller can also control the water pump and the combustor to be synchronously started according to the requirement, so that the anti-freezing effect is achieved.

In one embodiment, the anti-freezing gas water heating device further comprises a first valve; the first valve is arranged on the water return pipeline, and the controller is electrically connected with the first valve. Therefore, in the initial stage of judging that the normal water use mode is entered, the first valve is controlled to be maintained in a closed state, so that an external water source enters the interior of the main heat exchanger through the cold water joint pipe and the cold water inlet pipe, and the supplied water cannot be discharged outwards through the hot water joint through the water return pipeline; in addition, at the initial stage of normal water use mode outside the stage, then can control the first valve according to the demand and open, in the cold water inlet tube is entered into to some cold water of cold water joint pipe like this, and another part cold water enters into hot water joint pipe and hot water outlet pipe exhaust hot water intermix through the return water pipeline and supplies the user, plays the effect of adjusting the temperature. In addition, when in the standby mode, the controller correspondingly controls the first valve to be in an opening state, so that the cold water inlet pipe, the main heat exchanger, the hot water outlet pipe and the water return pipeline form an internal circulation passage.

In one embodiment, the anti-freezing gas-fired water heating device further comprises a water mixing proportion regulating valve, and the water mixing proportion regulating valve is electrically connected with the controller; the water mixing proportion regulating valve is provided with a first port, a second port and a third port which are communicated with each other; the first port is communicated with the hot water outlet pipe, the second port is communicated with the water return pipeline, and the third port is communicated with the cold water joint pipe. So, in normal water mode, when judging the temperature on hot water joint pipe or the hot water outlet pipe too high, through adjusting muddy water proportion governing valve, can adjust the mixing ratio of the hot water of hot water outlet pipe and the cold water of return water pipeline to the temperature control that can make the outside hydrothermal of export of hot water joint pipe is in presetting the scope.

In one embodiment, the anti-freezing gas water heating device further comprises a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor, the second temperature sensor and the third temperature sensor are electrically connected with the controller; the first temperature sensor is arranged on the cold water inlet pipe and used for acquiring a first water temperature of the cold water inlet pipe; the second temperature sensor is arranged at the water outlet end of the phase-change heat storage module and used for acquiring a second water temperature of the water outlet end of the phase-change heat storage module; the third temperature sensor is arranged on the hot water joint pipe and used for acquiring a third water temperature of the hot water joint pipe. So, can sense the first temperature of cold water through first temperature-sensing ware, can sense the second temperature after main heat exchanger and the heating of phase transition heat-retaining module through the second temperature-sensing ware, can sense the third temperature of hot water joint pipe through the third temperature-sensing ware, the controller can master the operating condition of gas hot water heating device that prevents frostbite according to first temperature, second temperature and third temperature to can corresponding control mix water proportion regulating valve, combustor work.

In one embodiment, the anti-freezing gas water heating device further comprises a fourth temperature sensor, and the fourth temperature sensor is electrically connected with the controller; the fourth temperature sensor is arranged at the water inlet end of the phase-change heat storage module and used for sensing a fourth water temperature at the water inlet end of the phase-change heat storage module. Therefore, the fourth temperature sensor can sense the temperature of hot water at the water outlet end of the main heat exchanger, and the phase change heat storage module can be judged to be in a heat storage working mode or a heat release working mode by comparing the fourth water temperature with the second water temperature.

In one embodiment, the phase-change heat storage module comprises a first shell, a heat exchange assembly and a phase-change material; the first shell is provided with a heat storage chamber, and the heat exchange assembly and the phase-change material are both arranged in the heat storage chamber; the water inlet end and the water outlet end of the heat exchange component are arranged on the hot water outlet pipe in series; the anti-freezing gas water heating device further comprises a pressure sensor, the pressure sensor is arranged on the phase-change heat storage module and used for sensing the pressure of the heat storage cavity, and the pressure sensor is electrically connected with the controller. Therefore, the pressure sensor senses the internal pressure value P of the heat storage chamber, whether the stored heat of the phase-change heat storage module is enough or not can be correspondingly judged according to the internal pressure value P, if not, the water pump needs to be controlled to start to carry out internal circulation, and the burner needs to be controlled to ignite to work, so that hot water produced by the main heat exchanger enters the phase-change heat storage module to heat and store energy for the phase-change material; in addition, according to pressure value P's variable quantity, whether the ambient temperature that can corresponding judgement gas hot water system that prevents frostbite locates is lower, if ambient temperature is lower, then need control the water pump start-up and control combustor ignition work, and the hot water through main heat exchanger output carries out the inner loop in the circulation path of hot water outlet pipe, return water pipeline, cold water pipeline and main heat exchanger, avoids the frost crack damage phenomenon that gas hot water system that prevents frostbite appears when ambient temperature is lower.

The second technical problem is solved by the following technical solutions:

a control method of the anti-freezing gas water heating device comprises the following steps:

acquiring a water flow signal sensed by a water flow sensor;

when the variable quantity of the water flow is judged to be smaller than the first preset value and the water flow is judged to be smaller than the second preset value, a standby working mode is entered, and the standby working mode comprises the following steps: and starting the water pump, and controlling the rotating speed of the water pump to enable the water flow variation not to be larger than a first preset value and the water flow not to be larger than a second preset value.

Compared with the background technology, the control method of the anti-freezing gas water heating device has the following beneficial effects:

according to the control method of the anti-freezing gas water heating device, the water pump is controlled to be started at a lower rotating speed, the water source circularly flows through a passage formed by the cold water inlet pipe, the main heat exchanger, the hot water outlet pipe and the water return pipeline under the driving force action of the water pump, the heat energy of the phase change heat storage module can play an anti-freezing role in the circulating flow process, a burner does not need to be started, an electric heating rod does not need to be adopted to heat a pipeline, only the water pump needs to be started, the noise of the water pump during working is greatly smaller than the noise of the burner during working, the combustion noise can be reduced, and the cost is lower.

In one embodiment, the control method of the anti-freezing gas water heating device further comprises the following steps:

when the variable quantity of the water flow is judged to be smaller than a first preset value and the water flow is judged to be smaller than a second preset value, controlling a first valve to be opened before the step of starting the water pump;

and when the variable quantity of the water flow is judged to be not less than the first preset value or the water flow is judged to be not less than the second preset value, controlling the first valve to be closed before the step of starting the water pump and the burner.

In one embodiment, after the step of controlling the rotation speed of the water pump so that the water flow variation is not greater than the first preset value and the water flow is not greater than the second preset value, the method further comprises the steps of:

acquiring a pressure value of a heat storage chamber of the phase-change heat storage module;

judging whether the variation of the pressure value is smaller than a first set value within a first preset time;

and when the variable quantity of the pressure value is smaller than a first set value in a first preset time, closing the water pump.

In one embodiment, after the step of controlling the rotation speed of the water pump so that the variation of the water flow is not greater than the first preset value and the water flow is not greater than the second preset value, the method further comprises the steps of:

and when the variation of the pressure value is not less than a first set value within a first preset time, starting the burner, and closing the burner and the water pump after the burner works for a third preset time.

In one embodiment, before the step of controlling the rotation speed of the water pump so that the water flow variation is not greater than the first preset value and the water flow is not greater than the second preset value, the method further comprises the steps of:

acquiring a pressure value of a heat storage chamber of the phase-change heat storage module;

judging whether the pressure value is greater than a second set value or not;

when the pressure value is smaller than the second set value, starting a water pump, starting a combustor, and closing the combustor and the water pump after the water pump and the combustor work for a fourth preset time; and when the pressure value is not less than the second set value, starting the water pump, and controlling the rotating speed of the water pump to enable the water flow variation not to be greater than a first preset value and the water flow not to be greater than a second preset value.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an anti-freezing gas-fired water heater according to an embodiment of the present invention;

FIG. 2 is a flow chart of a control method of the anti-freezing gas-fired water heater according to an embodiment of the present invention;

fig. 3 is a flowchart of a control method of an anti-freeze gas-fired water heating apparatus according to another embodiment of the present invention.

Reference numerals:

10. a primary heat exchanger; 21. a cold water joint pipe; 22. a cold water inlet pipe; 23. a water return pipeline; 24. a hot water outlet pipe; 25. a hot water joint pipe; 30. a phase change heat storage module; 31. a first housing; 32. a heat exchange assembly; 33. a phase change material; 40. a burner; 50. a water pump; 60. a controller; 70. a first valve; 81. a mixed water proportion regulating valve; 82. a pressure sensor; 91. a first temperature sensor; 92. a second temperature sensor; 93. a third temperature sensor; 94. a fourth temperature sensor; 95. a second housing; 96. an air intake line; 97. a gas proportional valve; 98. an ignition assembly; 99. a smoke exhaust fan.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1, fig. 1 is a schematic structural diagram illustrating an anti-freezing gas water heater according to an embodiment of the present invention, and the anti-freezing gas water heater according to the embodiment of the present invention includes: the heat exchanger comprises a main heat exchanger 10, a cold water joint pipe 21, a cold water inlet pipe 22, a water return pipeline 23, a hot water outlet pipe 24, a hot water joint pipe 25, a phase change heat storage module 30, a water flow sensor (not shown), a combustor 40, a water pump 50 and a controller 60. The cold water joint pipe 21 is communicated with a cold water inlet pipe 22, and the cold water inlet pipe 22 is communicated with the water inlet end of the main heat exchanger 10. The water outlet end of the main heat exchanger 10 is communicated with the water inlet end of the hot water outlet pipe 24. The water outlet end of the hot water outlet pipe 24 is communicated with a hot water joint pipe 25. One end of the return pipeline 23 is communicated with the water outlet end of the hot water outlet pipe 24, and the other end of the return pipeline 23 is communicated with the cold water joint pipe 21. The phase change heat storage modules 30 are arranged in series on the hot water outlet pipe 24. The water flow sensor is arranged on the cold water inlet pipe 22, the cold water joint pipe 21, the hot water outlet pipe 24 or the hot water joint pipe 25. The burner 40 is operated to heat the main heat exchanger 10, and the water pump 50 is provided in series to the cold water inlet pipe 22. The controller 60 is electrically connected to the burner 40, the water pump 50 and the water flow sensor. The controller 60 is used for controlling the operation of the water pump 50 and for controlling the operation of the burner 40 according to a water flow signal sensed by the water flow sensor.

The anti-freezing gas water heating device senses the water flow through the water flow sensor and transmits the sensed water flow signal to the controller 60, and the controller 60 can correspondingly judge whether the anti-freezing gas water heating device is in a normal water mode or a standby mode and can correspondingly control the water pump 50 and the burner 40 to work. When the anti-freezing gas water heating device is in a standby mode (that is, in the standby mode, a user does not use a water source of the anti-freezing gas water heating device, and an external water source does not enter the anti-freezing gas water heating device), the controller 60 can control the water pump 50 to be started at a lower rotating speed, so that the water source can circularly flow through a passage formed by the cold water inlet pipe 22, the main heat exchanger 10, the hot water outlet pipe 24 and the water return pipeline 23 under the driving force of the water pump 50, the heat energy of the phase-change heat storage module 30 can play an anti-freezing role in the circulating flow process, the burner 40 does not need to be started, an electric heating rod is not needed to heat the pipeline, the water pump 50 only needs to be started, the noise of the water pump 50 during working is greatly smaller than the noise of the burner 40 during working, the combustion noise can be reduced, and the cost is lower; in addition, in the standby operation mode, when the stored heat energy of the phase-change heat storage module 30 is not enough to resist the external cold environment, the controller 60 can control the water pump 50 and the burner 40 to be synchronously started as required, so as to achieve the anti-freezing effect.

Referring to fig. 1, in one embodiment, the antifreeze gas-fired water heater further includes a first valve 70. The first valve 70 is disposed on the water return line 23, and the controller 60 is further electrically connected to the first valve 70. In this way, at an initial stage (for example, within 20S, 40S or 60S) of determining that the normal water use mode is entered, the first valve 70 is controlled to be maintained in a closed state so that the external water source enters the inside of the main heat exchanger 10 through the cold water joint pipe 21 and the cold water inlet pipe 22 without discharging the supply water to the outside through the hot water joint through the return water pipe 23; in addition, in a stage other than the initial stage of the normal water usage mode, the first valve 70 may be controlled to open according to the requirement, such that a portion of the cold water in the cold water joint pipe 21 enters the cold water inlet pipe 22, and another portion of the cold water enters the hot water joint pipe 25 through the return pipe 23 and is mixed with the hot water discharged from the hot water outlet pipe 24 and supplied to the user, thereby performing a function of adjusting the water temperature. In addition, in the standby mode, the controller 60 controls the first valve 70 to be in the open state accordingly, so that the cold water inlet pipe 22, the main heat exchanger 10, the hot water outlet pipe 24 and the water return pipe 23 form an internal circulation path. Specifically, the first valve 70 is, for example, an electrically controlled valve, a pneumatic control valve, or the like, and is not limited herein and is set according to actual requirements.

Referring to fig. 1, in one embodiment, the anti-freezing gas-fired water heating apparatus further includes a water mixing ratio adjusting valve 81. The mixing ratio adjusting valve 81 is electrically connected to the controller 60. The mixed water ratio adjusting valve 81 is provided with a first port, a second port and a third port which are communicated with each other. The first port is communicated with a hot water outlet pipe 24, the second port is communicated with a water return pipeline 23, and the third port is communicated with a cold water joint pipe 21. Thus, in the normal water usage mode, when the water temperature on the hot water joint pipe 25 or the hot water outlet pipe 24 is judged to be too high, the mixing ratio of the hot water in the hot water outlet pipe 24 and the cold water in the water return pipeline 23 can be adjusted by adjusting the mixed water ratio adjusting valve 81, so that the temperature of the hot water output from the hot water joint pipe 25 can be controlled within the preset range.

As an alternative, the mixing ratio adjusting valve 81 may not be provided, for example, a three-way valve may be used to replace the mixing ratio adjusting valve 81, that is, the three ends of the hot water outlet pipe 24, the hot water joint pipe 25 and the water return pipe 23 are connected to each other by a three-way valve.

Referring to fig. 1, in one embodiment, the anti-freezing gas-fired water heating apparatus further includes a first temperature sensor 91, a second temperature sensor 92, and a third temperature sensor 93. The first temperature sensor 91, the second temperature sensor 92 and the third temperature sensor 93 are electrically connected to the controller 60. The first temperature sensor 91 is disposed on the cold water inlet pipe 22 for obtaining a first water temperature of the cold water inlet pipe 22. The second temperature sensor 92 is disposed at the water outlet end of the phase change heat storage module 30, and is configured to obtain a second water temperature at the water outlet end of the phase change heat storage module 30. The third temperature sensor 93 is disposed on the hot water joint pipe 25, and is configured to obtain a third water temperature of the hot water joint pipe 25. So, can sense the first temperature of cold water through first temperature-sensing ware 91, can sense the second temperature after main heat exchanger 10 and phase transition heat-retaining module 30 heat through second temperature-sensing ware 92, can sense the third temperature of hot water joint pipe 25 through third temperature-sensing ware 93, controller 60 can master the operating condition of gas hot water heating apparatus that prevents frostbite according to first temperature, second temperature and third temperature to can corresponding control mix water proportion control valve 81, combustor 40 work.

Referring to fig. 1, in one embodiment, the anti-freeze gas water heater further includes a fourth temperature sensor 94. The fourth temperature sensor 94 is electrically connected to the controller 60. The fourth temperature sensor 94 is disposed at the water inlet end of the phase change heat storage module 30 for sensing a fourth water temperature at the water inlet end of the phase change heat storage module 30. Thus, the fourth temperature sensor 94 can sense the temperature of the hot water at the water outlet end of the main heat exchanger 10, and can determine whether the phase change heat storage module 30 is in the heat storage mode or the heat release mode by comparing the fourth water temperature with the second water temperature. Specifically, when the fourth water temperature is lower than the second water temperature, it indicates that the phase-change heat storage module 30 transfers heat to and heats the hot water in the hot water outlet pipe 24, and the operation is in a heat release operation mode; when the fourth water temperature is higher than the second water temperature, it indicates that the phase-change heat storage module 30 absorbs the heat of the hot water in the hot water outlet pipe 24, and operates in the heat storage operating mode.

Referring to fig. 1, in one embodiment, the phase change heat storage module 30 includes a first housing 31, a heat exchange assembly 32, and a phase change material 33. The first shell 31 is provided with a heat storage chamber, and the heat exchange assembly 32 and the phase-change material 33 are both arranged in the heat storage chamber; the water inlet end and the water outlet end of the heat exchange component 32 are arranged on the hot water outlet pipe 24 in series; the anti-freezing gas water heating device further comprises a pressure sensor 82, the pressure sensor 82 is arranged on the phase change heat storage module 30, the pressure sensor 82 is used for sensing the pressure of the heat storage chamber, and the pressure sensor 82 is electrically connected with the controller 60.

Note that, the phase change material 33 is, for example, an organic phase change material 33, an inorganic phase change material 33, or a mixed phase change material 33 in which the organic phase change material 33 and the inorganic phase change material 33 are mixed with each other, and the like, and the invention is not limited thereto. A specific example of the phase transition temperature of the phase change material 33 is 40 ℃ to 80 ℃, and specifically, the phase transition temperature of the phase change material 33 in this embodiment is 55 ℃, 58 ℃, 60 ℃, 62 ℃ or 65 ℃, for example, and when the temperature of the phase change material 33 is higher than the phase transition temperature, the phase change material 33 is changed from a solid state to a liquid state or a state in which solid and liquid coexist, and thermal energy storage can be realized. Further, the internal pressure value P of the heat storage chamber is different when the temperature of the phase change material 33 is different, specifically, the internal pressure value P of the heat storage chamber is higher as the temperature of the phase change material 33 is higher; the lower the temperature of the phase change material 33, the lower the internal pressure value P of the heat storage chamber. In this way, the pressure sensor 82 senses the internal pressure value P of the heat storage chamber, and correspondingly determines whether the stored heat of the phase-change heat storage module 30 is sufficient according to the internal pressure value P, if not, the water pump 50 needs to be controlled to start to perform internal circulation, and the burner 40 needs to be controlled to perform ignition work, so that the hot water generated by the main heat exchanger 10 enters the phase-change heat storage module 30 to heat and store energy for the phase-change material 33; in addition, according to the variation of the pressure value P, whether the ambient temperature of the anti-freezing gas water heating device is low or not can be correspondingly judged, if the ambient temperature is low, the water pump 50 needs to be controlled to start and the burner 40 needs to be controlled to ignite, the hot water produced by the main heat exchanger 10 is subjected to internal circulation in the hot water outlet pipe 24, the water return pipeline 23, the cold water pipeline and the circulation passage of the main heat exchanger 10, and the frost crack damage phenomenon of the anti-freezing gas water heating device when the ambient temperature is low is avoided.

Referring to fig. 1, in one embodiment, the phase change heat storage module 30 further includes a thermal insulation material (not shown). The heat insulating material is provided outside the first housing 31. The heat insulation material plays a role in heat insulation, and the heat of the phase change material 33 is prevented from being diffused and lost to the external environment.

Referring to fig. 1, in one embodiment, the anti-freeze gas fired water heater further includes a second housing 95. The main heat exchanger 10, the phase-change heat storage module 30, the burner 40, the water pump 50, and the controller 60 are disposed inside the second casing 95. In this way, the second casing 95 serves as a casing to protect the main heat exchanger 10, the phase change heat storage module 30, the burner 40, the water pump 50, and the controller 60 installed therein.

Referring to fig. 1, in one embodiment, the anti-freezing gas water heating device further includes an air inlet pipe 96, a gas proportional valve 97 and an ignition assembly 98. The air inlet pipeline 96 is connected with the burner 40, the gas proportional valve 97 is arranged on the air inlet pipeline 96, and the gas proportional valve 97 is electrically connected with the controller 60; ignition assembly 98 is configured to ignite burner 40, and ignition assembly 98 is electrically coupled to controller 60.

Referring to fig. 1, in one embodiment, the anti-freezing gas-fired water heating apparatus further comprises a smoke exhaust fan 99. The smoke exhaust fan 99 is electrically connected to the controller 60, and the smoke exhaust fan 99 is used for discharging high-temperature smoke generated by the burner 40 to the outside of the anti-freezing gas water heating device.

Referring to fig. 1 and 2, fig. 2 is a flowchart illustrating a control method of an anti-freeze gas-fired water heating apparatus according to an embodiment of the present invention. In one embodiment, a control method of the anti-freezing gas-fired water heating device in any one of the above embodiments includes the following steps:

s100, acquiring a water flow signal sensed by a water flow sensor;

step S120, entering a standby working mode when the variable quantity of the water flow is judged to be smaller than a first preset value and the water flow is judged to be smaller than a second preset value, wherein the standby working mode comprises a step S151; when the variable quantity of the water flow is judged to be not less than the first preset value or the water flow is judged to be not less than the second preset value, entering a normal water using mode, wherein the normal water using mode comprises a step S140;

thus, when it is determined that the variation of the water flow is smaller than the first preset value and the water flow is smaller than the second preset value, it indicates that the external water source does not enter the anti-freezing gas water heater through the cold water joint pipe 21, that is, the anti-freezing gas water heater is in the standby operation mode, and then the operation goes to step S151; when the variable quantity of the water flow is not less than the first preset value or the water flow is not less than the second preset value, it indicates that the water consumption point is opened at this time, and the external water source enters the anti-freezing gas water heating device through the cold water joint pipe 21, that is, the anti-freezing gas water heating device is in the normal water consumption mode, and accordingly the step S140 is performed.

It should be noted that the first preset value and the second preset value are set according to actual situations, and are not limited herein.

Step S151, starting the water pump 50, controlling the rotating speed of the water pump 50 to enable the water flow variation not to be larger than a first preset value and the water flow not to be larger than a second preset value, and entering step S160;

in step S151, on one hand, under the control of the controller 60, the water pump 50 rotates at a low speed, so that the water flow variation is not greater than the first preset value, and the water flow is not greater than the second preset value, thereby avoiding misjudgment that an external water source enters the anti-freezing gas-fired water heating apparatus through the cold water joint pipe 21, that is, the controller 60 does not start the burner 40 to work at this time; on the other hand, when the water pump 50 rotates at a lower rotating speed, the water source can circularly flow through a passage formed by the cold water inlet pipe 22, the main heat exchanger 10, the hot water outlet pipe 24 and the water return pipeline 23, the heat energy of the phase change heat storage module 30 can be absorbed in the circulating flow process, the antifreezing effect is achieved, the burner 40 does not need to be started, the pipeline does not need to be heated by an electric heating rod, only the water pump 50 needs to be started, the noise of the water pump 50 in the working process is greatly smaller than that of the burner 40 in the working process, the combustion noise can be reduced, and the cost is lower.

Step S140, starting the water pump 50 and the combustor 40;

step S140 is a normal water usage mode, in which the burner 40 heats the main heat exchanger 10 when operating, and the water pump 50 increases the pressure when operating, so that an external water source enters the main heat exchanger 10 through the cold water joint pipe 21 and the cold water inlet pipe 22 at a relatively high pressure.

According to the control method of the anti-freezing gas water heating device, the water pump 50 is controlled to be started at a low rotating speed, the water source circularly flows through a passage formed by the cold water inlet pipe 22, the main heat exchanger 10, the hot water outlet pipe 24 and the water return pipeline 23 under the driving force of the water pump 50, the heat energy of the phase change heat storage module 30 can play an anti-freezing role in the circulating flow process, the combustor 40 does not need to be started, an electric heating rod does not need to be adopted to heat a pipeline, only the water pump 50 needs to be started, the noise of the water pump 50 in working is greatly smaller than that of the combustor 40 in working, the combustion noise can be reduced, and the cost is low.

Further, the control method of the anti-freeze gas-fired water heating apparatus further includes, after the step S151, the steps of:

step S160, obtaining a pressure value of the heat storage chamber of the phase change heat storage module 30;

step S170, judging whether the variation of the pressure value is smaller than a first set value within a first preset time;

when the variation of the pressure value is smaller than the first set value within the first preset time, it indicates that the water path is not lost to the outside in the internal circulation process of the anti-freezing gas water heating device, that is, the external environment temperature is high enough, so that the heat supply for the water path of the internal circulation is performed through the phase change heat storage module 30, and the anti-freezing effect can be achieved without starting the burner 40. On the contrary, when the variation of the pressure value is not less than the first set value within the first preset time, it indicates that the loss of the waterway to the outside is more in the internal circulation process of the anti-freezing gas water heater, that is, the external environment temperature is worse, the heat energy of the phase change heat storage module 30 supplies heat to the waterway of the internal circulation, the anti-freezing effect is not enough, and the burner 40 needs to be started.

The first preset time and the first set value are set according to actual conditions, and are not limited herein.

Step S171, when it is determined that the variation of the pressure value is smaller than the first set value within the first preset time, the water pump 50 is turned off, and the process returns to step S151 after the second preset time.

Referring to fig. 1 and 2 again, further, the control method of the anti-freezing gas-fired water heating apparatus further includes the steps of:

step S121, opening the first valve 70;

step S121 is located between step S120 and step S151. Thus, when the first valve 70 is opened, the water source circularly flows through a passage formed by the cold water inlet pipe 22, the main heat exchanger 10, the hot water outlet pipe 24 and the water return pipe 23.

Step S122, closing the first valve 70;

step S122 is located between step S120 and step S140. In this manner, at an initial stage (for example, within 20S, 40S, or 60S) of determining that the normal water use mode is entered, the first valve 70 is controlled to be maintained in a closed state so that the external water source is entered into the interior of the main heat exchanger 10 through the cold water joint pipe 21 and the cold water inlet pipe 22 without discharging the supply water to the outside through the hot water joint through the return water pipe 23.

Referring to fig. 1 and 3, fig. 3 is a flowchart illustrating a control method of an anti-freeze gas-fired water heating apparatus according to another embodiment of the present invention. In one embodiment, the step of controlling the rotation speed of the water pump 50 such that the water flow variation is not greater than the first preset value and the water flow is not greater than the second preset value is followed by the step of:

step S172, when the variation of the pressure value is not less than the first set value within the first preset time, starting the burner 40;

after the burner 40 is started in step S173, the burner 40 and the water pump 50 are turned off after the burner 40 is operated for the third preset time, and the process returns to step S130.

In one embodiment, before the step of controlling the rotation speed of the water pump 50 such that the water flow variation is not greater than the first preset value and the water flow is not greater than the second preset value, the method further comprises the steps of:

step S130, obtaining a pressure value of the heat storage chamber of the phase change heat storage module 30;

step S150, judging whether the pressure value is larger than a second set value;

the second setting value is set according to actual conditions, and is not limited herein.

Step S152, when the pressure value is smaller than the second set value, starting the water pump 50 and starting the burner 40, and the process goes to step S153; when the pressure value is not less than the second set value, the process proceeds to step S151.

When the pressure value is smaller than the second set value, it indicates that the heat stored in the phase change heat storage module 30 is insufficient, and the water pump 50 and the burner 40 need to be started, so that the burner 40 heats the hot water in the water path, and the heat is supplemented to the phase change heat storage module 30 in the hot water circulation process.

Step S153, the burner 40 and the water pump 50 are closed after the water pump 50 and the burner 40 work for a fourth preset time;

the fourth preset is set according to actual conditions, and is not limited herein.

It should be noted that in an infringement comparison, where one of the elements is described as being connected to another element and one of the elements is attached to another element, it is understood that the two elements may be connected by fasteners such as bolts, screws, pins, rivets, etc., or may be fixedly connected by snapping, welding or integral molding. Wherein, the integrated molding mode can adopt the processes of extrusion, casting, press fitting, injection molding and the like.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. An anti-freezing gas water heater, characterized in that, the anti-freezing gas water heater includes:

the water-cooled heat exchanger comprises a main heat exchanger (10), a cold water joint pipe (21), a cold water inlet pipe (22), a water return pipeline (23), a hot water outlet pipe (24) and a hot water joint pipe (25), wherein the cold water joint pipe (21) is communicated with the cold water inlet pipe (22), the cold water inlet pipe (22) is communicated with the water inlet end of the main heat exchanger (10), the water outlet end of the main heat exchanger (10) is communicated with the water inlet end of the hot water outlet pipe (24), the water outlet end of the hot water outlet pipe (24) is communicated with the hot water joint pipe (25), one end of the water return pipeline (23) is communicated with the water outlet end of the hot water outlet pipe (24), and the other end of the water return pipeline (23) is communicated with the cold water joint pipe (21);

the phase-change heat storage module (30), the phase-change heat storage module (30) is arranged on the hot water outlet pipe (24) in series;

the water flow inductor is arranged on the cold water inlet pipe (22), the cold water joint pipe (21), the hot water outlet pipe (24) or the hot water joint pipe (25);

the water heater comprises a burner (40), a water pump (50) and a controller (60), wherein the burner (40) heats the main heat exchanger (10) when working, and the water pump (50) is arranged on the cold water inlet pipe (22) in series; the controller (60) is electrically connected with the burner (40), the water pump (50) and the water flow sensor respectively; the controller (60) is used for controlling the water pump (50) to work and controlling the burner (40) to work according to a water flow signal sensed by the water flow sensor.

2. The antifreeze gas fired water heater of claim 1, further comprising a first valve (70); the first valve (70) is arranged on the water return pipeline (23), and the controller (60) is electrically connected with the first valve (70).

3. The anti-freezing gas water heating device according to claim 2, further comprising a water mixing proportion adjusting valve (81), wherein the water mixing proportion adjusting valve (81) is electrically connected with the controller (60); the mixed water proportion regulating valve (81) is provided with a first port, a second port and a third port which are communicated with each other; the first port is communicated with the hot water outlet pipe (24), the second port is communicated with the water return pipeline (23), and the third port is communicated with the cold water joint pipe (21).

4. The antifreeze gas hot water apparatus according to claim 3, further comprising a first temperature sensor (91), a second temperature sensor (92), and a third temperature sensor (93); the first temperature sensor (91), the second temperature sensor (92) and the third temperature sensor (93) are electrically connected with the controller (60); the first temperature sensor (91) is arranged on the cold water inlet pipe (22) and used for acquiring a first water temperature of the cold water inlet pipe (22); the second temperature sensor (92) is arranged at the water outlet end of the phase-change heat storage module (30) and is used for acquiring a second water temperature of the water outlet end of the phase-change heat storage module (30); the third temperature sensor (93) is arranged on the hot water joint pipe (25) and used for acquiring a third water temperature of the hot water joint pipe (25).

5. The antifreeze gas hot water apparatus according to claim 4, further comprising a fourth temperature sensor (94), wherein the fourth temperature sensor (94) is electrically connected to the controller (60); the fourth temperature sensor (94) is arranged at the water inlet end of the phase-change heat storage module (30) and used for sensing a fourth water temperature at the water inlet end of the phase-change heat storage module (30).

6. The anti-freezing gas water heating device according to claim 1, wherein the phase change heat storage module (30) comprises a first shell (31), a heat exchange assembly (32) and a phase change material (33); the first shell (31) is provided with a heat storage chamber, and the heat exchange assembly (32) and the phase change material (33) are both arranged in the heat storage chamber; the water inlet end and the water outlet end of the heat exchange component (32) are arranged on the hot water outlet pipe (24) in series; the anti-freezing gas water heating device further comprises a pressure sensor (82), the pressure sensor (82) is arranged on the phase change heat storage module (30), the pressure sensor (82) is used for sensing the pressure of the heat storage chamber, and the pressure sensor (82) is electrically connected with the controller (60).

7. A control method of an antifreeze gas-fired water heating apparatus as set forth in any one of claims 1 to 6, comprising the steps of:

acquiring a water flow signal sensed by a water flow sensor;

when the variable quantity of the water flow is judged to be smaller than the first preset value and the water flow is judged to be smaller than the second preset value, a standby working mode is entered, and the standby working mode comprises the following steps: the water pump (50) is started, and the rotating speed of the water pump (50) is controlled so that the water flow variation is not larger than a first preset value, and the water flow is not larger than a second preset value.

8. The control method of an anti-freeze gas water heater according to claim 7, further comprising the step of, after the step of controlling the rotation speed of the water pump (50) so that the variation of the water flow is not greater than a first preset value and the water flow is not greater than a second preset value:

acquiring a pressure value of a heat storage chamber of the phase-change heat storage module (30);

judging whether the variation of the pressure value is smaller than a first set value within a first preset time;

and when the variation of the pressure value is smaller than a first set value in a first preset time, the water pump (50) is turned off.

9. The control method of an anti-freeze gas water heater according to claim 8, further comprising the step of, after the step of controlling the rotation speed of the water pump (50) so that the variation of the water flow is not greater than a first preset value and the water flow is not greater than a second preset value:

and when the variation of the pressure value is not less than a first set value within a first preset time, starting the burner (40), and closing the burner (40) and the water pump (50) after the burner (40) works for a third preset time.

10. The control method of the antifreeze gas-fired water heater as set forth in claim 7, further comprising the steps of, before said step of controlling the rotation speed of the water pump (50) so that the amount of change in the water flow rate is not greater than a first preset value and the water flow rate is not greater than a second preset value:

acquiring a pressure value of a heat storage chamber of the phase-change heat storage module (30);

judging whether the pressure value is greater than a second set value or not;

when the pressure value is smaller than the second set value, starting a water pump (50), starting a burner (40), and closing the burner (40) and the water pump (50) after the water pump (50) and the burner (40) work for a fourth preset time; and when the pressure value is not less than the second set value, starting the water pump (50), and controlling the rotating speed of the water pump (50) to enable the water flow variation not to be greater than a first preset value and the water flow not to be greater than a second preset value.

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