CN219283626U

CN219283626U - Heat exchange system and gas water heater

Info

Publication number: CN219283626U
Application number: CN202222811378.2U
Authority: CN
Inventors: 罗潘; 杨启欣; 刘兵
Original assignee: Guangdong Macro Gas Appliance Co Ltd
Current assignee: Guangdong Macro Gas Appliance Co Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-06-30
Anticipated expiration: 2032-10-24

Abstract

The application relates to a heat exchange system and a gas water heater, wherein the heat exchange system comprises a heat burning module and an electric heating module which are connected to a first pipeline, and has a preset maximum load; the water pump is arranged between the electric heating module and the water inlet, and has a preset rotating speed which is adjustable; in the preheating mode, the liquid heating device has a first preset temperature, only the electric heating module is started to heat, the power consumed by the liquid entering the electric heating module when the liquid is heated to the first preset temperature is compared with a preset maximum load, and the preset rotating speed is regulated according to the comparison result; in the normal bath mode, the liquid is provided with a second preset temperature, the power consumed by heating the liquid entering the electric heating module to the second preset temperature is compared with the preset maximum load, and the electric heating module is selectively started to heat according to the comparison result, or the combustion heating module and the electric heating module are selectively started to heat. The heat exchange system and the gas water heater can meet the use requirements in different modes, and are energy-saving and noise-reducing.

Description

Heat exchange system and gas water heater

Technical Field

The application relates to the technical field of gas water heaters, in particular to a heat exchange system and a gas water heater.

Background

The gas water heater is widely used as a household appliance commonly used in daily life of people. Because the gas water heater is limited by the heating mode, the steps of starting the ignition fan and the like are needed to occur in the heating process, and the noise is high. In addition, the temperature of the water outlet is easily influenced by the external environment to be too high or too low, and the phenomenon of temperature overshoot can occur in the process of circularly preheating the gas water heater, so that the user experience is influenced.

Disclosure of Invention

An object of the application is to provide a heat transfer system and gas heater, this heat transfer system and gas heater can satisfy the user demand under the different modes, and energy saving falls the noise.

To this end, in a first aspect, embodiments of the present application provide a heat exchange system for a gas water heater, the heat exchange system comprising,

the combustion heating module is connected with the first pipeline and is used for heating liquid fuel gas entering from the first pipeline;

the electric heating module is connected with the first pipeline and is used for electrically heating the liquid entering from the first pipeline, and the electric heating module has a preset maximum load;

the water pump is connected to the first pipeline, the first pipeline is provided with a water inlet and a water outlet, the water pump is arranged between the electric heating module and the water inlet, the water pump is provided with a preset rotating speed, and the preset rotating speed is adjustable;

the heat exchange system comprises a preheating mode and a normal bath mode, wherein the preheating mode has a first preset temperature, only the electric heating module is started to heat, the load required by heating the liquid entering the electric heating module to the first preset temperature is compared with the preset maximum load, and the preset rotating speed is regulated according to the comparison result;

and in the normal bath mode, the liquid is provided with a second preset temperature, the load required by heating the liquid entering the electric heating module to the second preset temperature is compared with the preset maximum load, and the electric heating module is selectively started to heat according to the comparison result, or the combustion heating module and the electric heating module are selectively started to heat.

In one possible implementation, the liquid entering from the water inlet in the first pipe has an initial temperature and an initial flow rate,

in the preheating mode, calculating the load required by the electric heating module when the liquid entering at the initial flow rate is heated from the initial temperature to the first preset temperature, comparing the load with the preset maximum load, if the load is larger than the preset maximum load, reducing the preset rotating speed, otherwise, maintaining the preset rotating speed;

and in the normal bath mode, calculating the load required by the electric heating module when the liquid entering at the initial flow rate is heated from the initial temperature to the second preset temperature, comparing the load with the preset maximum load, and starting the electric heating module and the heating module to heat together if the load is larger than the preset maximum load, otherwise, starting only the electric heating module to heat.

In one possible implementation manner, the electric heating device further comprises an anti-freezing mode, wherein the anti-freezing mode has a third preset temperature, the third preset temperature is smaller than the first preset temperature, the load required by the liquid entering the electric heating module to be heated to the third preset temperature is smaller than or equal to the preset maximum load, the water pump is started to operate at the preset rotating speed, and only the electric heating module is started to be heated.

In one possible implementation, the electrothermal module is disposed between the heat burning module and the water pump, or the electrothermal module is disposed between the heat burning module and the water outlet.

In a possible implementation manner, the electric heating device further comprises a second pipeline, two ends of the second pipeline are respectively connected to the positions of the first pipeline corresponding to the water inlet end and the water outlet end of the heating module, so that the second pipeline is connected in parallel with the heating module, the second pipeline is communicated when the heating module is only started, the first pipeline corresponding to the heating module is connected in parallel, the first pipeline corresponding to the heating module is disconnected, and the second pipeline is disconnected when the heating module is started and the heating module is heated.

In one possible implementation manner, the heat exchange system further comprises an electric three-way valve, wherein a part of the first pipeline communicated with the outlet of the electric heating module is connected with the electric three-way valve, and the second pipeline and the water inlet end of the combustion heating module are respectively connected through the electric three-way valve.

In one possible implementation, the electrothermal module includes:

the heating body is provided with an inner cavity, the inner cavity is provided with a first port and a second port which are communicated, the first pipeline is connected with the first port and the second port, and the heating body is a rare earth thick film heating pipe;

the spiral flow passage is arranged in the inner cavity, and two ends of the spiral flow passage are respectively communicated with the first port and the second port.

In one possible implementation manner, the water inlet device further comprises a water inlet temperature sensor and a water outlet temperature sensor which are arranged on the first pipeline, wherein the water inlet temperature sensor is positioned between the water inlet and the water pump, the water outlet temperature sensor is positioned between the water outlet and the electric heating module, or the water outlet temperature sensor is positioned between the water outlet and the combustion heating module.

In one possible implementation manner, the electric heating system further comprises a control module, wherein the control module is electrically connected with the electric heating module, the combustion heating module, the water pump and the electric three-way valve respectively.

In a second aspect, embodiments of the present application provide a gas water heater comprising a heat exchange system as described in the foregoing.

According to the heat exchange system and the gas water heater provided by the embodiment of the application, in the preheating mode, only the electric heating module is started for heating, before heating, whether the load required by the electric heating module when the entered water is heated to the first preset temperature is compared with the preset maximum load or not can be judged, and if the electric heating module can be required, the electric heating module is started for heating; if the requirement cannot be met, the preset rotating speed of the water pump can be reduced so as to meet the required requirement. By utilizing the cooperation of the electric heating module and the water pump, electric heating can be realized only through the electric heating module in a preset mode, and the starting of a heavy-load gas module is not needed, so that the preheating noise is low, and the energy consumption is saved. Under the general condition, the electric heating module can be adjusted in a stepless way between 0 KW and 3KW, so that the heating is not easy to overheat. In the normal bath mode, judging whether the load required by the electric heating module when the entered water is heated to the second preset temperature can meet the requirement or not compared with the preset maximum load, if the electric heating module can meet the power requirement, only starting the electric heating module to heat, and if the electric heating module cannot meet the requirement, starting the electric heating module and the heating module to heat simultaneously. In the mode, different heating modes can be selected according to actual conditions, heating of the electric heating module is the main mode to the greatest extent, and the preset maximum load of the electric heating module is far lower than the load of the combustion heating module, so that the condition that the temperature of water after heating is too high can not occur when the temperature of water inlet is higher in summer for example. In addition, the electric heating module is used as a main and the combustion heating module is used as an auxiliary, so that the energy consumption during heating is low, the heat exchange efficiency is high, the stability is good, and the energy conservation and the noise reduction are realized. Therefore, through the heat exchange system, the mode that the electric heating module is mainly used for heating and the heat burning module is used for assisting in different modes can be adjusted according to the mode, so that the zero cold water gas water heater has the effects of energy conservation, noise reduction and stable water outlet temperature, and user experience is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art. In addition, in the drawings, like parts are designated with like reference numerals and the drawings are not drawn to actual scale.

FIG. 1 shows a simplified flow schematic of a heat exchange system provided in an embodiment of the present application;

FIG. 2 shows a simplified flow schematic of another heat exchange system provided in an embodiment of the present application;

FIG. 3 shows a simplified flow schematic of yet another heat exchange system provided in an embodiment of the present application;

fig. 4 shows a schematic cross-sectional view of an electrothermal module in a heat exchange system according to an embodiment of the present application.

Reference numerals

1-a first pipeline; 11-water inlet; 12-water outlet; 13-a water outlet temperature sensor; 14-a water inlet temperature sensor; 2-an electrothermal module; 21-heating the body; 211-a first port; 212-a second port; 22-spiral flow channels; 23-a water inlet end cover; 24-a water outlet end cover; 3-a combustion thermal module; 31-an air inlet pipeline; 4-a water pump; 5-a control module; 6-an electric three-way valve; 7-a second pipeline.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

Fig. 1 shows a simple flow schematic of a heat exchange system provided in an embodiment of the present application. Fig. 2 shows a simplified flow diagram of another heat exchange system provided in an embodiment of the present application. Fig. 3 shows a simplified flow diagram of yet another heat exchange system provided in an embodiment of the present application.

Referring to fig. 1 to 3, an embodiment of the present application provides a heat exchange system for a gas water heater. The heat exchange system comprises a heat burning module 3, an electric heating module 2 and a water pump 4 which are connected in series through a first pipeline 1, wherein the heat burning module 3 is used for heating liquid fuel gas entering from the first pipeline 1, the electric heating module 2 is used for electrically heating liquid entering from the first pipeline 1, the first pipeline 1 is provided with a water inlet 11 and a water outlet 12, the water inlet 11 is connected with an external water supply pipeline, for example, the water supply pipeline can be a tap water pipe, and the water outlet 12 is connected with a water outlet device, for example, a shower head. The gas water heater further comprises an air inlet pipeline 31, wherein the air inlet pipeline 31 is connected with the combustion module 3 and is used for supplying air to the combustion module 3.

It can be understood that the gas water heater can be a common water heater or a zero cold water gas water heater, and the heat exchange system can be adaptively assembled into different types of gas water heaters according to requirements. The reference to a gas water heater hereinafter refers to a zero-water cold water gas water heater, which is not individually emphasized in the following.

Alternatively, the heating module 3 may comprise a heat exchanger connected to the air intake line 31, the heat exchanger being one of the main components of a zero-cold water gas water heater, having universality, and the incoming cold water being able to output hot water after being circulated through the heat exchanger and heated by the gas, not described in detail herein.

Wherein, the electric heating module 2 has a preset maximum load, the water pump 4 is arranged between the electric heating module 2 and the water inlet 11, the water pump 4 has a preset rotating speed, and the preset rotating speed is adjustable. The heat exchange system comprises a preheating mode and a normal bath mode, wherein the preheating mode has a first preset temperature, only the electric heating module 2 is started for heating, the load required by heating the liquid entering the electric heating module 2 to the first preset temperature is compared with a preset maximum load, and the preset rotating speed is adjusted according to the comparison result. In the normal bathing mode, the liquid enters the electric heating module 2 and is heated to a second preset temperature, the load required by the liquid is compared with the preset maximum load, and the electric heating module 2 is selectively started to heat according to the comparison result, or the heating module 3 and the electric heating module 2 are selectively started to heat.

In the zero cold water gas water heater, the preheating mode is the zero cold water preheating mode, and the subsequent independent emphasis is not carried out. The heat exchange system can select a preheating mode or a normal bathing mode according to the requirements of users. In the preheating mode, only starting the electrothermal module 2 for heating, judging whether the load required by the electrothermal module 2 can meet the requirement when the entered water is heated to the first preset temperature and compared with the preset maximum load before heating, and starting the electrothermal module 2 for heating if the electrothermal module 2 can meet the requirement of power; if the requirement cannot be met, the preset rotation speed of the water pump 4 can be reduced so as to meet the required requirement. By utilizing the cooperation of the electric heating module 2 and the water pump 4, electric heating can be realized only through the electric heating module 2 in a preset mode, and the starting of a fuel gas module consuming large power is not needed, so that preheating noise is low, and energy consumption is saved. In general, the electrothermal module 2 can be adjusted in a stepless way between 0 KW and 3KW, so that the heating is not easy to overheat. In the normal bath mode, judging whether the load required by the electric heating module 2 when the entered water is heated to the second preset temperature can meet the requirement or not compared with the preset maximum load, if the electric heating module 2 can meet the power requirement, only starting the electric heating module 2 for heating, and if the electric heating module 2 cannot meet the requirement, starting the electric heating module 2 and the heating module 3 for heating simultaneously. In the mode, different heating modes can be selected according to actual conditions, heating of the electric heating module 2 is mainly carried out to the greatest extent during bath, and the preset maximum load of the electric heating module 2 is far lower than the load of the heating module 3, so that the condition that the temperature of heated water is too high can not occur when the temperature of the water inlet is higher in summer for example. In addition, the electric heating module 2 is used as a main part, and the hot-burning module 3 is used as an auxiliary part, so that the energy consumption during heating is lower, the heat exchange efficiency is higher, the stability is better, and the energy conservation and the noise reduction are realized.

Therefore, through the heat exchange system, the mode that the electric heating module 2 is mainly used for heating and the hot-air heating module 3 is used for assisting in different modes can be adjusted according to the mode, so that the zero cold water gas water heater has the effects of energy conservation, noise reduction and stable water outlet temperature, and user experience is ensured.

It can be appreciated that the set first preset temperature and second preset temperature may be the same or different, and may be set according to the user's requirement. The preset rotation speed set by the water pump 4 is generally a fixed rotation speed capable of maintaining the normal circulation of the zero-cold water gas water heater, on the basis of the fixed rotation speed, the fixed rotation speed can be increased or decreased according to the heating requirement of the electric heating module 2 so as to ensure that the electric heating module 2 can stably run in a preset mode, and the increased or decreased rotation speed can be adaptively adjusted according to the actual situation, and the set fixed rotation speed is specifically set with a numerical value or a range, which is not limited herein.

The first preset temperature and the second preset temperature may be set according to the needs of the user, for example, may be set to 40 °, 45 °, 50 °, etc., and are not limited herein in particular,

optionally, the minimum load of the gas module is 3 kW-4 kW, the preset maximum load of the electric heating module 2 is not more than 3kW, and the electric heating module 2 can be adjusted steplessly between 0 KW and 3 KW.

In an alternative embodiment, the liquid entering from the water inlet 11 in the first pipeline 1 has an initial temperature and an initial flow rate, in the preheating mode, the load required by the electric heating module 2 when the liquid entering at the initial flow rate is heated from the initial temperature to a first preset temperature is calculated, the load is compared with a preset maximum load, if the load is larger than the preset maximum load, the preset rotating speed is reduced, otherwise, the preset rotating speed is maintained; in the normal bath mode, the load required by the electric heating module 2 when the liquid entering at the initial flow rate is heated from the initial temperature to the second preset temperature is calculated, the load is compared with the preset maximum load, if the load is larger than the preset maximum load, the electric heating module 2 and the heating module 3 are started to heat together, otherwise, only the electric heating module 2 is started to heat. On the one hand, the water temperature entering from the water inlet 11 may be different under the influence of the external environment temperature (such as summer and winter), especially in summer, the water temperature entering from the water inlet 11 is higher (i.e. initial temperature), so that the power consumption required for heating to the first preset temperature or the second preset temperature is lower than the usual consumption, and accordingly, the electric heating module 2 can be used for heating in different modes in an adaptive manner, or the electric heating module 2 and the heating module 3 are used for mixed heating, so that the problems of overhigh water temperature, energy waste, high noise and the like caused by independently adopting the heating module 3 for heating are avoided.

On the other hand, the flow rate of liquid entering from the water inlet 11 is different due to external environmental factors, when the flow rate of the liquid entering from the water inlet 11 is smaller, the flow rate of the entering water is lower (in the allowable load range of the electrothermal module 2), particularly in the normal bath mode, the electrothermal module 2 can be directly judged to be adopted for heating, and the problem of temperature overshoot caused by the minimum combustion load when the combustion thermal module 3 is heated is solved.

It will be appreciated that the initial temperature of the liquid entering the inlet 11 is affected by conditions such as the external ambient temperature and the temperature that is considered to be changed, and the specific values or ranges thereof are not specifically limited herein. The specific range defined by the larger or smaller flow rate of the liquid entering the water inlet 11 may be defined according to the actual situation, and is not specifically limited herein.

Optionally, in different modes, the initial flow rate and the initial temperature of the liquid entering through the water inlet 11 may be both in a normal range, or at least one of them may be abnormal, and in actual use, the heating mode may be selected by calculation and judgment according to specific conditions, which will not be described in detail herein.

In an alternative embodiment, the heat exchange system further comprises an anti-freezing mode, in which the anti-freezing mode has a third preset temperature, the third preset temperature is smaller than the first preset temperature, the load required by the liquid entering the electric heating module 2 to be heated to the third preset temperature is smaller than or equal to a preset maximum load, the water pump 4 is started to operate at a preset rotating speed, and only the electric heating module 2 is started to be heated. For example, when the external environment temperature is low in winter, the heat exchange system can actively start an anti-freezing mode, and in the mode, the set third preset temperature can be smaller than the first preset temperature, so that the requirement can be met by directly adopting the electric heating module 2 to heat under the condition that the rotating speed of the water pump 4 is not changed, and the noise is reduced.

Optionally, the third preset temperature is a temperature at which the zero cold water gas water heater is kept warm, and the temperature may be lower than the first preset temperature, and in some cases, may be equal to or slightly higher than the first preset temperature, where, in order to meet the requirement of only turning on the electric heating module 2 for heating, the speed of the water pump 4 may be reduced to adjust adaptively, which is not limited herein.

The specific structure of the heat exchange system provided in the embodiments of the present application is further described in detail below with reference to the accompanying drawings.

With continued reference to fig. 1-3, the present application provides a specific embodiment, in which the electric heating module 2 in the heat exchange system is disposed between the heat burning module 3 and the water pump 4, or the electric heating module 2 is disposed between the heat burning module 3 and the water outlet 12. Namely, the electrothermal module 2 can be arranged at a position close to the water inlet 11 or a position close to the water outlet 12. In a preferred embodiment, the electrothermal module 2 is generally disposed near the water inlet 11, and the water inlet end is relatively low in temperature, so that the formation of scale in the electrothermal module 2 can be reduced.

In an alternative embodiment, referring to fig. 3, the heat exchange system further includes a second pipeline 7, two ends of the second pipeline 7 are respectively connected to positions of the first pipeline 1 corresponding to the water inlet end and the water outlet end of the heat burning module 3, so that the second pipeline 7 is connected in parallel with the heat burning module 3, when only the electric heating module 2 is started to heat, the second pipeline 7 is connected, the first pipeline 1 corresponding to the parallel heat burning module 3 is partially disconnected, and when the electric heating module 2 and the heat burning module 3 are started to heat, the second pipeline 7 is disconnected. Through the second pipeline 7 that sets up, connect in parallel second pipeline 7 with fire the thermal module 3 for under the mode of predetermineeing or the mode of preventing frostbite of only opening electric heat module 2 heating, can just through the circulation of intercommunication second pipeline 7 with the realization circulation, and need not in the circulation pipeline (because of need make heat exchanger and high temperature flue gas fully exchange heat, the inside more right angle of having of gas heater heat exchanger bend, whole pipeline resistance is great) through the more fire the thermal module 3 of bend, solved the problem that causes bathing discharge to be less because of the heat exchanger coil pipe too much.

Optionally, the heat exchange system further comprises an electric three-way valve 6, the heat exchange system further comprises the electric three-way valve 6, a part of the first pipeline 1 communicated with the outlet of the electric heating module 2 is connected with the electric three-way valve 6, and the electric three-way valve 6 is respectively connected with the second pipeline 7 and the water inlet end of the heating module 3. Through the electronic three-way valve 6 that sets up, can be with the liquid selectivity circulation that gets into from water inlet 11 to second pipeline 7 and/or fire the hot mould piece 3, the control of being convenient for can realize quick automatic switch-over according to the different demands under the different modes.

In an alternative embodiment, referring to fig. 4, the electrothermal module 2 includes a heating body 21 having an inner cavity with a first port 211 and a second port 212 which are communicated, the first pipeline 1 connects the first port 211 and the second port 212, the heating body 21 is a rare earth thick film heating tube, a spiral flow channel 22 is disposed in the inner cavity, and two ends of the spiral flow channel 22 are respectively communicated with the first port 211 and the second port 212. In the electric heating module 2, the rare earth thick film heating pipe is electrically connected with an external power supply, so that the heating is realized, the power density is high, the heating speed is high, and the safety and the environmental protection are realized. And through the spiral flow passage 22, the travel of the liquid flowing in the spiral flow passage is increased to the greatest extent, the heat exchange time of the water flow and the heating body 21 is increased, and the heat exchange efficiency is improved.

The spiral flow channel 22 disposed in the inner cavity can adapt to the spiral density according to the requirement in order to ensure a better heat exchange effect, and will not be described in detail herein.

It will be appreciated that the first port 211 and the second port 212 are respectively connected with the water inlet end cover 23 and the water outlet end cover 24 in a sealing manner, and the corresponding interfaces of the water inlet end cover 23 and the water outlet end cover 24 are respectively used for connecting the first pipeline 1. And the end cover and the heating body 21 are in sealing connection by arranging a sealing element (such as a sealing gasket), so that the potential risk of water leakage is avoided due to electrochemical corrosion caused by welding.

Optionally, the rare earth thick film heating tube is one type of heating tube, and specific processing means and implementation manners thereof are not described in detail herein.

In an alternative embodiment, the heat exchange system further comprises a water inlet temperature sensor 14 and a water outlet temperature sensor 13 arranged on the first pipeline 1, wherein the water inlet temperature sensor 14 is positioned between the water inlet 11 and the water pump 4, the water outlet temperature sensor 13 is positioned between the water outlet 12 and the electric heating module 2, or the water outlet temperature sensor 13 is positioned between the water outlet 12 and the hot burning module 3. That is, the water inlet temperature sensor 14 is disposed at a position close to the water inlet 11 for detecting the water inlet temperature, and the water outlet temperature sensor 13 is disposed at a position close to the water outlet 12 for detecting the water outlet temperature. The heat exchange system can acquire the initial temperature and the water outlet temperature of the liquid through the temperature sensor so as to adjust the heating modes in different modes.

It will be appreciated that the temperature sensor may be provided as a contact temperature sensor, such as a temperature probe, through which the corresponding temperature is measured by contact with the pipe or directly with the liquid, which will not be described in detail herein.

Optionally, a flow sensor is further disposed on the first pipeline 1 corresponding to the water inlet 11, for detecting an initial flow of the liquid entering from the water inlet 11, which is not described in detail herein.

In an alternative embodiment, the electric heating device further comprises a control module 5, wherein the control module 5 is electrically connected with the electric heating module 2, the heating module 3, the water pump 4, the electric three-way valve 6, the water inlet temperature sensor 14, the water outlet temperature sensor 13 and the flow sensor respectively, so that corresponding information can be obtained through the arranged control module 5, and calculation and analysis can be performed according to the obtained information, and thus the analysis result is fed back to the corresponding component to control the corresponding component to execute corresponding actions such as opening and closing or adjusting, and the detailed description is omitted herein.

The embodiment of the application also provides a gas water heater, which can be a zero cold water gas water heater, including the heat exchange system described in the above, and will not be repeated.

It should be noted that, the heat exchange system provided in the embodiment of the present application is not limited to be applied to a device in the field of a zero cold water gas water heater, but may be applied to other gas heating arrangements, which is not described again.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat exchange system for a gas water heater, the heat exchange system comprising:

the heating module is connected to the first pipeline and is used for heating liquid fuel gas entering from the first pipeline;

2. The heat exchange system according to claim 1, wherein the liquid entering from the water inlet in the first line has an initial temperature and an initial flow rate,

3. The heat exchange system of claim 1, further comprising an anti-freeze mode in which a third preset temperature is present, the third preset temperature being less than the first preset temperature, and a load required for the liquid entering the thermoelectric module to heat to the third preset temperature is less than or equal to the preset maximum load, the water pump is started to operate at the preset rotational speed, and only the thermoelectric module is started to heat.

4. The heat exchange system of claim 1, wherein the electrothermal module is disposed between the combustion module and the water pump, or the electrothermal module is disposed between the combustion module and the water outlet.

5. The heat exchange system of claim 4 further comprising a second conduit, wherein two ends of the second conduit are respectively connected to the first conduit at positions corresponding to the water inlet end and the water outlet end of the heat-burning module, such that the second conduit is connected in parallel with the heat-burning module, and the second conduit is connected when only the electric heating module is started for heating, and the first conduit corresponding to the heat-burning module is disconnected when the electric heating module is started for heating, and the second conduit is disconnected when the electric heating module is started for heating.

6. The heat exchange system of claim 5, further comprising an electric three-way valve, wherein a portion of the first conduit communicating from the outlet of the electric heating module is connected to the electric three-way valve and through the electric three-way valve to the second conduit and the water inlet end of the combustion heating module, respectively.

7. A heat exchange system according to claim 3, wherein the thermoelectric module comprises:

8. The heat exchange system of claim 1, further comprising a water inlet temperature sensor and a water outlet temperature sensor disposed in the first conduit, the water inlet temperature sensor being located between the water inlet and the water pump, the water outlet temperature sensor being located between the water outlet and the electric heating module, or the water outlet temperature sensor being located between the water outlet and the combustion heating module.

9. The heat exchange system of claim 6, further comprising a control module electrically connected to the electric heating module, the combustion heating module, the water pump, and the electric three-way valve, respectively.

10. A gas water heater comprising a heat exchange system as claimed in any one of claims 1 to 9.