CN219868479U - gas water heater - Google Patents

Abstract

The utility model discloses a gas water heater, which comprises a combustion chamber; a heat exchanger for water supply flow heat exchange; the water inlet and outlet assembly comprises a water pump, an internal circulation coil pipe, a control valve, a water inlet pipe, a water outlet pipe, a water return pipe and a bypass pipe, wherein the water pump, the internal circulation coil pipe and the water inlet pipe are connected to form a water inlet flow path, the water return pipe and the water outlet pipe are connected to form a water outlet flow path, the bypass pipe is connected between the water return pipe and the water inlet pipe, and the control valve is connected with the bypass pipe and is configured to control the on-off of the bypass pipe; the heat exchanger is arranged at the top of the combustion chamber, the water inlet flow path is connected with the inlet of the heat exchanger, the water outlet flow path is connected with the outlet of the heat exchanger, and the internal circulation coil pipe is arranged on the surface of the combustion chamber in a roundabout way. The method can reduce the fluctuation range of the temperature of the secondary boiled water so as to improve the user experience.

Description

Gas water heater

Technical Field

The utility model belongs to the technical field of household appliances, and particularly relates to a gas water heater.

Background

At present, the water heater is a household appliance commonly used in daily life of people. The water heater is classified into a gas water heater, an electric water heater, and the like, wherein the gas water heater is widely used because of its convenient use. Conventional gas water heaters typically include a burner that combusts gas within a combustion chamber to heat water flowing through a heat exchanger, a combustion chamber, and a heat exchanger.

In the use process, when the user turns off water and starts, a certain amount of hot water is stored in the heat exchanger, the ignition is required to be delayed, at the moment, part of cold water enters the heat exchanger and is not fully heated and is output, and then the problem of water generation caused by the secondary boiled water occurs, so that the fluctuation of the temperature of the water outlet is large, and the use experience of the user is influenced.

In view of this, how to design a water heater technology for reducing the fluctuation range of the temperature of the secondary boiled water so as to improve the user experience is a technical problem to be solved by the utility model.

Disclosure of Invention

The utility model provides a gas water heater, which can reduce the fluctuation range of the temperature of secondary boiled water so as to improve the user experience.

In order to achieve the technical purpose, the utility model is realized by adopting the following technical scheme:

in one aspect, the present utility model provides a gas water heater comprising:

a combustion chamber;

a heat exchanger for water supply flow heat exchange;

the water inlet and outlet assembly comprises a water pump, an internal circulation coil pipe, a control valve, a water inlet pipe, a water outlet pipe, a water return pipe and a bypass pipe, wherein the water pump, the internal circulation coil pipe and the water inlet pipe are connected to form a water inlet flow path, the water return pipe and the water outlet pipe are connected to form a water outlet flow path, the bypass pipe is connected between the water return pipe and the water inlet pipe, and the control valve is connected with the bypass pipe and is configured to control the on-off of the bypass pipe;

the heat exchanger is arranged at the top of the combustion chamber, the water inlet flow path is connected with the inlet of the heat exchanger, the water outlet flow path is connected with the outlet of the heat exchanger, and the internal circulation coil pipe is arranged on the surface of the combustion chamber in a roundabout way.

The internal circulation coil is arranged in the water inlet flow path and is connected with the water inlet pipe on one hand, and on the other hand, the internal circulation coil is connected with the water return pipe through the bypass pipe and the control valve, in the use process, when a user turns on the gas water heater, under the condition of short water closing, the water return pipe is controlled to be communicated with the bypass pipe through the control valve, the water pump is started so that water in the gas water heater circularly flows between the heat exchanger and the internal circulation coil, the water in the internal circulation coil is further heated by utilizing the waste heat of the heat exchanger, and then the user delays the ignition process when using the secondary water, hot water in the internal circulation coil enters the heat exchanger, so that the water outlet pipe can output relatively constant-temperature hot water, the fluctuation range of the secondary boiled water temperature is reduced, and the user experience is improved.

In one embodiment of the utility model, the internal circulation coil is circuitously disposed in the upper portion of the combustion chamber and is positioned at the back of the heat exchanger.

In one embodiment of the utility model, a groove is formed in the back of the combustion chamber, and the inner circulation coil is located in the groove.

In one embodiment of the utility model, the control valve is connected between the bypass pipe and the outlet flow path.

In an embodiment of the present utility model, a first three-way pipe is connected in series in the water outlet flow path, and the first three-way pipe, the control valve and the bypass pipe are sequentially connected.

In one embodiment of the present utility model, the control valve is connected between the bypass pipe and the return pipe; the water return pipe is provided with the first three-way pipe, and the first three-way pipe is respectively connected with the control valve and the water outlet pipe.

In one embodiment of the utility model, the control valve is connected between the bypass pipe and the water intake flow path.

In an embodiment of the utility model, the control valve is connected between the bypass pipe, the water inlet pipe and the internal circulation coil, and the control valve is configured to switch the internal circulation coil to selectively communicate with the bypass pipe or the water inlet pipe.

In an embodiment of the utility model, the control valve is a four-way valve, and a zero cold water pipe is further connected to the control valve, and the control valve is configured to switch the internal circulation coil to selectively communicate with the bypass pipe, the water inlet pipe or the zero cold water pipe.

In an embodiment of the utility model, the water inlet and outlet assembly further comprises a water outlet tank, and the water outlet tank is connected between the water return pipe and the water outlet pipe.

And for the water output from the water outlet pipe, the water stored in the water outlet tank is output when the secondary water is used, the water in the water outlet tank is stored before the secondary water is used, the water temperature is closer to the set temperature of a user, and the range of temperature fluctuation is more favorable for reducing.

In one embodiment of the utility model, the water outlet tank is provided with an electric heating component and a temperature sensor.

In an embodiment of the present utility model, the bypass pipe is further provided with a check valve configured to limit the water in the bypass pipe to flow in one direction to the water inlet flow path.

In an embodiment of the present utility model, the water inlet pipe, the internal circulation coil pipe and the water pump are sequentially connected along a water flow direction.

In one embodiment of the present utility model, the water inlet pipe, the water pump and the internal circulation coil are sequentially connected along the flow direction of the water flow.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of a gas water heater according to an embodiment of the present utility model;

FIG. 2 is a second schematic diagram of a gas water heater according to an embodiment of the present utility model;

FIG. 3 is a third schematic diagram of an embodiment of the gas water heater of the present utility model;

FIG. 4 is a schematic view of a partial structure of a gas water heater according to an embodiment of the present utility model with a housing removed;

FIG. 5 is a schematic diagram of a gas water heater according to an embodiment of the present utility model;

FIG. 6 is a schematic flow path diagram of another embodiment of the gas water heater of the present utility model.

Reference numerals illustrate:

a housing 1000;

a burner 2000;

a heat exchanger 3000;

a combustion chamber 4000;

a water inlet and outlet assembly 5000;

the water pump 5100, the internal circulation coil 5200, the control valve 5300, the water inlet pipe 5400, the water outlet pipe 5500, the water return pipe 5600, the bypass pipe 5700, the multi-way connecting piece 5800 and the water outlet tank 5900;

the barrel 5210, the end cover 5220, the first connecting pipe 5230, the second connecting pipe 5240, the water retaining cover 5250, the mounting bracket 5260 and the one-way valve 5710;

the water temperature sensor comprises a detection module 6000, a water flow sensor 6100, a first water temperature sensor 6200 and a second water temperature sensor 6300.

Description of the embodiments

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in the description of the present utility model, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

The gas water heater adopts gas as main energy material, and the high temperature heat generated by combustion of the gas is transferred to cold water flowing through a heat exchanger to achieve the purpose of preparing hot water.

Gas water heaters typically include a housing, and a burner, heat exchanger, fan, and fan housing disposed within the housing.

The gas is conveyed to the burner, and is ignited by the ignition device, so that the burner combusts the conveyed gas, and heat is further generated.

The heat exchanger is internally provided with a heat exchange tube, one end of the heat exchange tube is communicated with a water supply pipeline, and the other end of the heat exchange tube is communicated with a shower head or a tap.

The heat generated by the combustion of the fuel gas by the burner is used for heating the heat exchange tube so as to raise the water temperature in the heat exchange tube to form hot water.

When the gas water heater works, cold water provided by the water supply pipeline flows into the heat exchange pipe, is heated into hot water by the heating source generated by the burner, and flows out of the shower head or the water tap through the hot water valve for users to use.

Meanwhile, in the operation of the gas water heater, the fans are electrified and run simultaneously, and under the action of the fans, the flue gas generated by the burner is discharged outdoors.

Heat generated by combustion of the fuel gas during operation of the burner is conducted to the housing in order to reduce heat transfer.

As shown in fig. 1-4, this embodiment proposes a gas water heater, at least including: a housing 1000, a burner 2000, a heat exchanger 3000 and a combustion chamber 4000, the heat exchanger 3000 being for water flow heat exchange.

During assembly, the burner 2000 is mounted in the bottom region of the combustion chamber and the heat exchanger 3000 is mounted in the top of the combustion chamber.

In the actual use process, after the fuel gas is delivered to the burner 2000 for ignition and combustion, the high-temperature flue gas generated by the fuel gas rises to heat the water flowing in the top heat exchanger 3000, and the high-temperature flue gas is finally output to the outside of the housing 1000 through the smoke exhaust pipe.

In order to solve the problem of large fluctuation of water outlet temperature caused by clamping water generated by secondary boiled water.

The gas water heater further comprises: and a water inlet and outlet assembly 5000. The water inlet and outlet assembly 5000 comprises a water pump 5100, an internal circulation coil 5200, a control valve 5300, a water inlet pipe 5400, a water outlet pipe 5500, a water return pipe 5600 and a bypass pipe 5700, wherein the water pump 5100, the internal circulation coil 5200 and the water inlet pipe 5400 are connected to form a water inlet flow path, the water return pipe 5600 and the water outlet pipe 5500 are sequentially connected to form a water outlet flow path, the bypass pipe 5700 is connected between the water return pipe 5600 and the water inlet pipe 5400, and the control valve 5300 is connected with the bypass pipe 5700 and is configured to control on and off of the bypass pipe 5700.

The heat exchanger is arranged at the top of the combustion chamber, the water inlet flow path is connected with the inlet of the heat exchanger, the water outlet flow path is connected with the outlet of the heat exchanger, and the internal circulation coil 5200 is arranged on the surface of the combustion chamber in a roundabout way.

Specifically, the water inlet pipe 5400 and the water outlet pipe 5500 of the water inlet/outlet assembly 5000 are configured to be connected to an external tap water pipe and a water terminal.

The internal circulation coil 5200 disposed in the water inlet flow path can satisfy the requirement of internal circulation at the time of secondary water use.

In the use process, when a user uses hot water, cold water conveyed by a tap water pipe enters the internal circulation coil 5200 through the water inlet pipe 5400 and enters the heat exchanger 3000 through the water pump 5100; the water introduced into the heat exchanger 3000 exchanges heat with high-temperature flue gas generated by combustion of fuel gas by the burner 2000 to form hot water and flows out through the water return pipe 5600 via the water outlet pipe 5500 to a water use terminal such as a faucet or a shower.

In some embodiments, the internal circulation coil 5200 is routed over the upper portion of the combustion chamber and on the back of the heat exchanger.

Specifically, the internal circulation coil 5200 is arranged at the upper part of the combustion chamber, so that the space between the combustion chamber and the shell is fully utilized to install the internal circulation coil 5200, and the requirement of compact design of the interior of the gas water heater is met.

And, the arrangement of the inner circulation coil 5200 on the upper portion of the combustion chamber can absorb the heat released from the top of the combustion chamber at the outside of the combustion chamber, thereby fully utilizing the heat generated by the combustion of the fuel gas to preheat the water in the inner circulation coil 5200.

In some embodiments, to meet the requirements of the light and thin design, a groove (not shown) may be further provided on the back of the combustion chamber, and the internal circulation coil 5200 is located in the groove.

Specifically, the back of combustion chamber is located the back of heat exchanger is formed with the recess, and the internal circulation coil is then installed in this recess to make internal circulation coil utilize the space that combustion chamber self originally took up to place the internal circulation coil, and then satisfy the requirement of shell frivolity design.

In a preferred embodiment, as shown in fig. 5, a water outlet tank 5900 may be further disposed in the water outlet flow path, and hot water stored in the water outlet tank 5900 itself may be directly output to mitigate temperature fluctuation at the beginning of secondary water consumption.

In the using process, the user can start water again after closing water for a short time, namely, secondary boiled water. Before the user generates the secondary boiled water, a certain amount of hot water is stored in the heat exchanger 3000 and the waste heat of the heat exchanger 3000 can continuously heat the water, so as to fully utilize the waste heat of the heat exchanger 3000 to heat the water and solve the technical problem of water outlet temperature fluctuation caused by the secondary boiled water.

After the user turns off the water for a short time, the control valve 5300 will act to allow the water return pipe 5600 to communicate with the water inlet flow path through the bypass pipe 5700, so that the heat exchanger 3000, the water return pipe 5600, the bypass pipe 5700, the internal circulation coil 5200 and the water pump 5100 are sequentially communicated to form a closed-loop water circulation flow path, i.e., an internal circulation is formed inside the device.

The water pump 5100 is started, and under the action of the water pump 5100, water in the internal circulation coil 5200 is input into the heat exchanger 3000, meanwhile, the water in the heat exchanger 3000 is circulated back into the internal circulation coil 5200, and the water in the internal circulation coil 5200 is circularly heated by the waste heat of the heat exchanger 3000.

In this way, when the user uses the boiled water for the second time, the flow paths between the return pipe 5600 and the bypass pipe 5700 are blocked by the control valve 5300. The burner 2000 delays ignition, and at the same time, under the action of cold water introduced from the water inlet pipe 5400, hot water in the internal circulation coil 5200 flows into the heat exchanger 3000, so that the relatively stable output hot water from the water outlet pipe 5500 is realized, and the fluctuation range of the temperature of the water outlet is reduced.

Meanwhile, after the waste heat of the heat exchanger 3000 heats the water in the internal circulation coil 5200 in a circulating way, the temperature still has a certain difference with the set temperature of the user, and when the user boiled water for the second time, the hot water in the internal circulation coil 5200 flows into the heat exchanger 3000 and then enters the water outlet tank 5900, so that the water in the water outlet tank 5900 is output first, the water in the water outlet tank 5900 is the water stored before the water is used for the second time, the water temperature is close to the set water outlet temperature of the user, the relative constant water outlet temperature of the water for the second time is ensured again, and the temperature fluctuation is reduced.

The internal circulation coil is arranged in the water inlet flow path and the second container is arranged in the water outlet flow path, on one hand, the internal circulation coil is connected with the water inlet pipe, on the other hand, the internal circulation coil is connected with the water return pipe through the bypass pipe and the control valve, in the use process, when a user turns on the gas water heater, under the condition of short water closing, the water return pipe is controlled to be communicated with the bypass pipe through the control valve, the water pump is started to enable water in the gas water heater to circularly flow between the heat exchanger and the internal circulation coil, and then the water in the internal circulation coil is heated by the waste heat of the heat exchanger, and then when the user uses water secondarily, the gas water heater delays the ignition process, hot water in the internal circulation coil enters the heat exchanger, so that the water outlet pipe can output hot water with relatively constant temperature, the fluctuation range of the secondary boiled water temperature is reduced, and the user experience is improved.

For the water output from the water outlet pipe, the water stored in the second container is output when the water is used for the second time, the water in the second container is stored before the water is used for the second time, the water temperature is closer to the set temperature of a user, and the range of temperature fluctuation is more favorable for reducing.

In some embodiments, a one-way valve 5710 is disposed between the bypass tube 5700, the one-way valve 5710 being configured to restrict the one-way flow of water in the bypass tube 5700 to the internal circulation coil 5200.

Specifically, in the process that the gas water heater is in the self-circulation before the secondary boiled water, since the water inlet pipe 5400 and the bypass pipe 5700 are also communicated with each other through the multi-way connecting piece 5800, in order to avoid that cold water reversely flows through the bypass pipe 5700 due to the water pressure effect of the tap water pipe when the water pump 5100 is not started, a one-way valve 5710 can be arranged between the control valve 5300 and the bypass pipe 5700, and the one-way valve 5710 can limit the water flow direction of the bypass pipe 5700, so that water in the bypass pipe 5700 cannot reversely flow. Further, it is ensured that after the water pump 5100 is started, water in the heat exchanger 3000 flows into the internal circulation coil 5200 through the bypass pipe 5700.

In some embodiments of the present utility model, as shown in fig. 2, according to the functional design of the gas water heater, for the gas water heater with the zero cold water function, the gas water heater is further configured with a zero cold water pipe 1001, and the zero cold water pipe 1001 is connected with an external pipeline outside the device to form a zero cold water loop.

The zero-cooling water pipe 1001 is connected to the water inlet flow path, and when the gas water heater is required to execute the zero-cooling water mode, water in the external pipeline enters the internal circulation coil 5200 through the zero-cooling water pipe 1001, and is heated by the heat exchanger and then is output from the water outlet pipe 5500.

For a specific installation position of the control valve 5300, it may be disposed on the water inlet flow path or the water outlet flow path as needed to realize the control bypass pipe 5700 to communicate the water inlet flow path and the water outlet flow path.

In one embodiment of the present utility model, as shown in fig. 3, a control valve 5300 is connected between the bypass pipe 5700 and the outlet flow path.

Specifically, the control valve 5300 may be disposed between one port of the bypass pipe 5700 and the water outlet flow path, the control valve 5300 selectively controls water in the water return pipe 5600 to enter the bypass pipe 5700, and the other port of the bypass pipe 5700 is communicated with the inlet of the internal circulation coil 5200.

In order to facilitate connection of the control valve 5300, a first tee (not shown) is connected in series in the water outlet flow path, and the first tee, the control valve 5300 and the bypass pipe 5700 are sequentially connected.

Specifically, the control valve 5300 is connected between the bypass pipe 5700 and the return pipe 5600; the return pipe 5600 is provided with the first three-way pipe, and the first three-way pipe is connected to the control valve 5300 and the water outlet tank 5900, respectively. In the pipe connection process, the return pipe 5600 is connected to the control valve 5300 and the outlet tank 5900 through a first tee pipe provided at an end portion thereof. When the internal circulation heating is needed, the control valve 5300 is opened, so that the water return pipe 5600 and the bypass pipe 5700 are communicated with each other, and then the internal circulation coil 5200, the water pump 5100, the heat exchanger and the water return pipe 5600 are sequentially communicated to form an internal circulation flow path.

In the zero cold water executing mode, the water pump 5100 starts the control valve 5300 to be inactive, the water return pipe 5600 is not communicated with the bypass pipe 5700, and as the user terminal is not started, water in the external pipeline enters the internal circulation coil 5200 through the zero cold water pipe under the action of the water pump 5100, and then enters the heat exchanger to heat and recycle the circulation flow to the external pipeline, so that the function of zero cold water is achieved.

Because the user closes water in the use, the water in the inner circulation coil 5200 can execute the inner circulation, and then a certain amount of hot water exists in the inner circulation coil 5200 to fully utilize the waste heat of the heat exchanger 3000 and the combustion chamber 4000, and then under the execution of the zero cooling water mode, the water in the external pipeline can enter into the inner circulation coil 5200 to enable the hot water in the inner circulation coil 5200 to participate in the zero cooling water flow path, so that the starting time of the burner 2000 under the zero cooling water mode is shortened, and the energy consumption is more beneficial to be reduced.

In another embodiment of the present utility model, as shown in fig. 1 and 2, a control valve 5300 is connected between the bypass pipe 5700 and the water inflow path.

Specifically, the control valve 5300 may be disposed between one port of the bypass pipe 5700 and the water inlet flow path, and the other port of the bypass pipe 5700 is connected to the water return pipe 5600. The control valve 5300 will control the switch bypass 5700 to control the water output from the return 5600 to enter the internal circulation coil 5200 via the bypass 5700.

In some embodiments, a control valve 5300 is connected between the bypass 5700, the inlet conduit 5400, and the internal circulation coil 5200, the control valve 5300 being configured to switch the internal circulation coil 5200 to selectively communicate with either the bypass 5700 or the inlet conduit 5400.

Specifically, the control valve 5300 may be a multi-way valve and connected in series between the inlet pipe 5400 and the internal circulation coil 5200, and the bypass pipe 5700 is connected to a corresponding port of the control valve 5300.

In normal use, the control valve 5300 allows flow communication between the inlet tube 5400 and the internal circulation coil 5200; when the internal circulation is performed before the secondary water use, the bypass pipe 5700 and the internal circulation coil 5200 are communicated with each other by the control valve 5300.

In some embodiments, the control valve 5300 is a four-way valve, and a zero cold water pipe is further connected to the control valve 5300, and the control valve 5300 is configured to switch the internal circulation coil 5200 to selectively communicate with the bypass pipe 5700, the water inlet pipe 5400 or the zero cold water pipe.

Specifically, in the case of the zero cold water pipe, the control valve 5300 is a four-way valve, and the four-way valve can select one of the water inlet pipe 5400, the zero cold water pipe and the bypass pipe 5700 to be communicated with the internal circulation coil 5200 according to the use condition.

In an embodiment of the present utility model, as shown in fig. 6, the gas water heater further includes a detection module 6000, and the detection module 6000 includes a water flow sensor 6100 disposed between the water pump 5100 and the heat exchanger 3000, and the water flow sensor is configured to trigger the water pump 5100 to adjust the rotation speed.

Specifically, the flow sensor can be according to the running state of zero cold water gas water heater, and when the water supply pressure of outside pipeline reduces in the use, the discharge under the normal heating state reduces, and at this moment, water flow sensor 6100 detects that discharge reduces below the settlement flow value, will trigger water pump 5100 and start to realize assisting the pressure boost through the water pump, and then ensure that the user normally uses the water heater.

In addition, for accurate control of the water temperature, the detection module 6000 further includes a temperature sensor including a first water temperature sensor 6200 provided at an inlet of the heat exchanger, a second water temperature sensor 6300 provided at a water inlet front side of the inner circulation coil 5200, and a third water temperature sensor 6300 provided on the water outlet tank 5900.

In the use, because inner loop coil 5200 is located between first temperature sensor 6200 and second temperature sensor 6300, through gathering the temperature value of first temperature sensor 6200 and second temperature sensor 6300, alright learn inner loop coil 5200 water inflow temperature and inner loop coil 5200's play water temperature, and then in the secondary boiled water control process, accurate control water pump 5100's start and stop.

With the third water temperature sensor 6300, the temperature of the hot water outputted from the water tank 5900 may be detected, and the gas supply amount of the burner 2000 and the rotation speed of the water pump 5100 may be adjusted according to the temperature of the hot water outputted so that the temperature of the water may be kept constant.

Further, in order to reduce the excessive temperature drop of the hot water outputted from the water outlet tank 5900 due to the long interval time of the secondary water, an electric heating member (not shown) may be provided to the water outlet tank 5900.

Specifically, after water is turned off and before secondary water is used by a user, when the difference value between the water temperature in the water outlet tank 5900 detected by the third water temperature sensor 6300 and the water temperature set by the user is larger than a set value, the water outlet tank 5900 can be electrically assisted and heated by the third water temperature sensor 6300 by touching the electric heating component to electrify, so that the water temperature fluctuation range of secondary water is further reduced.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A gas water heater, comprising:

a combustion chamber;

a heat exchanger for water supply flow heat exchange;

the water inlet and outlet assembly comprises a water pump, an internal circulation coil pipe, a control valve, a water inlet pipe, a water outlet pipe, a water return pipe and a bypass pipe, wherein the water pump, the internal circulation coil pipe and the water inlet pipe are connected to form a water inlet flow path, the water return pipe and the water outlet pipe are connected to form a water outlet flow path, the bypass pipe is connected between the water return pipe and the water inlet pipe, and the control valve is connected with the bypass pipe and is configured to control the on-off of the bypass pipe;

the heat exchanger is arranged at the top of the combustion chamber, the water inlet flow path is connected with the inlet of the heat exchanger, the water outlet flow path is connected with the outlet of the heat exchanger, and the internal circulation coil pipe is arranged on the surface of the combustion chamber in a roundabout way.

2. A gas water heater according to claim 1, wherein the internal circulation coil is circuitously arranged in an upper portion of the combustion chamber and is located at a back of the heat exchanger.

3. A gas water heater according to claim 2, wherein the back of the combustion chamber is provided with a recess in which the internal circulation coil is located.

4. The gas water heater as recited in claim 1, wherein the control valve is connected between the bypass pipe and the outlet flow path.

5. The gas water heater according to claim 4, wherein a first tee is connected in series in the water outlet flow path, and the first tee, the control valve and the bypass pipe are connected in sequence.

6. The gas water heater according to claim 5, wherein the control valve is connected between the bypass pipe and the return pipe; the water return pipe is provided with the first three-way pipe, and the first three-way pipe is respectively connected with the control valve and the water outlet pipe.

7. The gas water heater as recited in claim 1, wherein the control valve is connected between the bypass pipe and the water inlet flow path.

8. The gas water heater of claim 7, wherein the control valve is connected between the bypass pipe, the inlet pipe and the internal circulation coil, the control valve configured to switch the internal circulation coil to selectively communicate with either the bypass pipe or the inlet pipe.

9. The gas water heater of claim 8, wherein the control valve is a four-way valve, and a zero cold water pipe is further connected to the control valve, and the control valve is configured to switch the internal circulation coil to selectively communicate with the bypass pipe, the water inlet pipe, or the zero cold water pipe.

10. A gas water heater as claimed in any one of claims 1 to 9, wherein the water inlet and outlet assembly further comprises a water outlet tank connected between the return pipe and the outlet pipe.