CN117267943A - Gas water heater and control method thereof - Google Patents

Abstract

The invention discloses a gas water heater and a control method thereof. The gas water heater includes: the shell is provided with a water inlet pipe and a water outlet pipe; a burner for combusting a fuel gas; the heat exchanger is used for heat exchange of water supply flow; the internal circulation module comprises a circulation pump, a first water storage container and a bypass pipe, wherein the first water storage container is connected between the circulation pump and the bypass pipe and forms an internal flow path; an electrical heating module comprising an electrical heating component and a second water reservoir, the electrical heating component configured to energize heating water in the second water reservoir; the inner flow path is connected with the heat exchanger and forms an inner circulation flow path, and the second water storage container is connected between the heat exchanger and the water outlet pipe. The method reduces energy consumption and improves user experience of the zero-cooling water gas water heater.

Description

Gas water heater and control method thereof

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to a gas water heater and a control method thereof.

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, a combustion chamber, and a heat exchanger, where the burner combusts gas to heat water flowing through the heat exchanger.

In order to meet the requirement of constant-temperature water supply, the gas water heater in the prior art is generally internally provided with a first water storage container to realize internal circulation so as to reduce the fluctuation range of the outlet water temperature after secondary starting. As disclosed in chinese patent publication No. CN 105387629A, a constant temperature gas water heater and a control method thereof are disclosed, and by configuring a circulating pump and a first water storage container, the requirement of zero waiting of secondary boiled water during bath is achieved to realize constant temperature water outlet.

However, in the actual use process, when water is needed, the user needs to start the burner to heat the water, and under specific scene conditions, such as short-time water use in a kitchen, the burner is frequently started, so that on one hand, the fuel gas consumption is high, and on the other hand, the energy consumption is high, and on the other hand, the burner is started to generate large noise, so that the user experience is poor. In view of this, it is an object of the present invention to design a technology for reducing the effects of energy consumption and noise to improve the user experience.

Disclosure of Invention

The invention provides a gas water heater and a control method thereof, which can reduce energy consumption and improve user experience of a zero-cooling water gas water heater.

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

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

the shell is provided with a water inlet pipe and a water outlet pipe;

a burner for combusting a fuel gas;

the heat exchanger is used for heat exchange of water supply flow;

the internal circulation module comprises a circulation pump, a first water storage container and a bypass pipe, wherein the first water storage container is connected between the circulation pump and the bypass pipe and forms an internal flow path;

an electrical heating module comprising an electrical heating component and a second water reservoir, the electrical heating component configured to energize heating water in the second water reservoir;

the inner flow path is connected with the heat exchanger and forms an inner circulation flow path, and the second water storage container is connected between the heat exchanger and the water outlet pipe.

Through configuration inner loop module and electrical heating module, the first water storage container of inner loop module configuration can satisfy the requirement of carrying out the inner loop when suspending water, in addition, in the use, can utilize electrical heating part to carry out instant heating treatment to the water in the second water storage container to the electrical heating module that disposes on the outlet pipe, like this, under the scene that water consumption such as kitchen is less, only need start electrical heating module and supply hot water and need not frequently start the combustor, on the one hand can effectually reduce and lead to the gas consumption great because of frequently starting, on the other hand because utilize electrical heating part to heat the water in the second water storage container, can realize silence heating, with reduce the frequent start of combustor and produce great noise, and then reduced energy consumption and noise influence in order to improve user experience nature.

In an embodiment of the present application, the first water storage container is disposed on one side inside the housing and above the water inlet pipe, and the second water storage container is disposed on the other side inside the housing and above the water outlet pipe.

In an embodiment of the present application, a gas inlet pipe is provided on the housing, and the gas inlet pipe is configured to supply gas to the burner; the first water storage container is arranged on one side of the gas inlet pipe, the second water storage container is arranged on the other side of the gas inlet pipe, and the gas inlet pipe is positioned between the first water storage container and the second water storage container.

In an embodiment of the application, a first connecting pipe and a second connecting pipe are arranged on the second water storage container, a water outlet of the first connecting pipe is arranged at the bottom of the second water storage container, and a water inlet of the second connecting pipe is arranged at the top of the second water storage container.

In an embodiment of the present application, a first mounting hole and a second mounting hole are formed in the top of the second water storage container, the first connecting pipe is inserted into the first mounting hole, and the lower end portion of the first connecting pipe extends to the bottom of the second water storage container; and a water inlet of the second connecting pipe is connected with the second mounting hole.

In an embodiment of the present application, a first connecting pipe and a second connecting pipe are disposed on the first water storage container, a water outlet of the first connecting pipe is disposed at the bottom of the first water storage container, and a water inlet of the second connecting pipe is disposed at the top of the first water storage container.

In an embodiment of the application, the electric heating component is an electric heating pipe, the electric heating pipe is provided with a straight pipe section and a spiral section, the spiral section is arranged on the straight pipe section, the straight pipe section penetrates through the second water storage container, and the spiral section is arranged between the water inlet of the first connecting pipe and the water outlet of the second connecting pipe.

In an embodiment of the present application, the circulating pump, the first water storage container and the bypass pipe are sequentially connected, and the circulating pump is connected with the water inlet end of the heat exchanger;

the bypass pipe is provided with a first electric control valve, and the first electric control valve is configured to control the on-off of the bypass pipe.

In an embodiment of the present application, a first three-way pipe is disposed on the first connecting pipe, and the first three-way pipe is connected with the heat exchanger and the bypass pipe respectively. The second connecting pipe is provided with a second three-way pipe, and the second three-way pipe is respectively connected with the water outlet pipe and the bypass pipe.

In an embodiment of the present application, the water inlet pipe, the first water storage container, the circulating pump and the water inlet end of the heat exchanger are sequentially connected.

In an embodiment of the present application, a four-way pipe is disposed on the first water storage container;

the shell is provided with a zero-cooling water pipe, the zero-cooling water pipe is provided with a second electric control valve, and the second electric control valve is configured to control the on-off of the zero-cooling water pipe;

the four-way pipe is respectively connected with the bypass pipe, the water inlet pipe and the zero-cooling water pipe.

In one embodiment of the present application, the bypass pipe is provided with a one-way valve configured to restrict the water in the bypass pipe from flowing in one direction to the first water storage container.

In another aspect, the invention further provides a control method of the gas water heater, which comprises the following steps: a first water mode and a second water mode;

in the first water mode, after water is started, the electric heating module is electrified and started to heat water in the second water storage container for instant heating type water supply, and at the moment, the burner is not started;

in the second water mode, after water is started, the burner is started to heat water flowing in the heat exchanger.

Drawings

In order to more clearly illustrate the embodiments of the present invention 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 invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is one of the structural schematic diagrams of an embodiment of the zero cold water gas water heater of the present invention;

FIG. 2 is a second schematic structural diagram of an embodiment of the zero cold water gas water heater of the present invention;

FIG. 3 is a schematic diagram of a zero-cooling water gas water heater according to an embodiment of the present invention;

FIG. 4 is a second schematic structural view of an embodiment of the zero cold water gas water heater of the present invention;

FIG. 5 is a schematic view of the first water container of FIG. 3;

FIG. 6 is a cross-sectional view of the first water storage container of FIG. 3;

FIG. 7 is a schematic view of the second water storage container of FIG. 3;

FIG. 8 is a cross-sectional view of the second water storage container of FIG. 3;

FIG. 9 is an exploded view of the second water storage container of FIG. 3;

fig. 10 is an assembly view of the electrical heating element of fig. 9.

Reference numerals illustrate:

1. A housing; 11. a water inlet pipe; 12. a water outlet pipe; 13. zero cooling water pipe; 14. a servo proportional valve; 15. a fuel gas inlet pipe; 16. a second electrically controlled valve;

2. a combustion chamber;

3. a heat exchanger;

4. an internal circulation module; 41. a circulation pump; 42. a first water storage container; 43. a bypass pipe; 44. a first electrically controlled valve; 45. a four-way pipe; 46. a one-way valve; 421. a first connecting pipe; 422. a second connecting pipe;

5. an electric heating module; 51. an electric heating member; 52. a second water storage container; 511. a straight pipe section; 512. a helical section; 521. a first connection pipe; 522. and a second connection pipe.

Detailed Description

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

It should be noted that, in the description of the present invention, 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 invention. 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 invention, 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 invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, 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 invention. 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 invention. Furthermore, the present invention 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 invention 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 and the like.

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.

In a first embodiment, as shown in fig. 1 to 8, the present embodiment provides a gas water heater, which includes a housing 1, and a combustion chamber 2, a burner, and a heat exchanger 3 provided in the housing 1. The shell 1 is provided with a water inlet pipe 11, a water outlet pipe 12 and a zero cooling water pipe 13.

Wherein, in order to realize the requirement that the temperature rise is reduced to the secondary boiled water in order to improve the constant temperature of the water outlet, the gas water heater is provided with an internal circulation module 4. The internal circulation module 4 includes a circulation pump 41, a first water storage container 42, and a bypass pipe 43, the first water storage container 42 being connected between the circulation pump 41 and the bypass pipe 43 and forming an internal flow path, the internal flow path being connected with the heat exchanger 3 and forming an internal circulation flow path.

Specifically, in the water consumption process of the user, when the user turns off the water for a short time, the water in the heat exchanger 3 is heated up by the waste heat in the combustion chamber 2, so that the circulating pump 41 can be started, and the cold water in the first water storage container 42 circularly flows into the heat exchanger 3 to absorb the waste heat, so that the requirement of smaller fluctuation of the water outlet temperature of boiled water in the next time is met.

In addition, in order to reduce the ignition start times of the burner according to the water demand during use, so as to reduce energy consumption and noise, the gas water heater is provided with an electric heating module 5, the electric heating module 5 comprises an electric heating part 51 and a second water storage container 52, the electric heating part 51 is arranged on the second water storage container 52 and is configured to electrically heat water in the second water storage container 52, and the second water storage container 52 is connected between the heat exchanger 3 and the water outlet pipe 12.

Specifically, in the use process, when a user needs a large amount of hot water during bath or the like, the gas water heater is normally started to burn gas through the burner to heat the water flowing through the heat exchanger 3. When the user needs a small amount of hot water in kitchen water, on the one hand, the flow rate of the hot water is small, and on the other hand, the user frequently turns on and off to use the hot water, at this time, the electric heating module 5 can be started to heat the water in the second water storage container 52 so as to realize the requirement of instant heating type water supply.

In this process, the burner in the gas water heater is not started, but only the heat generated by the electric heating component 51 in the electric heating module 5 through the electric heating is used for heating the water in the second water storage container 52, and the heat generated by the electric heating component 51 in the electric heating module 5 is used for meeting the requirement of instant heating with smaller water flow.

In order to meet the requirement of flow restriction control, a servo proportional valve 14 is connected in series to a flow path between the water inlet pipe 11 and the heat exchanger 3, and the water inlet flow of the gas heat exchanger 3 is automatically regulated by the servo proportional valve 14.

In addition, in the actual control process of the gas water heater, a triggering component for triggering the electric heating module 5 to start so as to realize instant heating type hot water supply can be configured on the gas water heater. When the trigger part is triggered during the use of the user, the electric heating module 5 starts to perform heating of water, so that after the user turns on the faucet, the electric heating module 5 starts the instant heating type water supply mode, and in the instant heating type water supply mode, the water inflow is controlled through the servo proportional valve 14.

The triggering component may be a switch arranged on the gas water heater, or other components capable of triggering the gas water heater to perform mode switching, which is not limited and described herein.

The servo proportional valve 14 generally performs servo adjustment according to the outlet water temperature detected by a temperature sensor disposed on the outlet pipe 12 for adjusting the inlet water amount, for example, when the outlet water temperature of the outlet pipe 12 is higher than a set outlet water temperature, the servo proportional valve 14 increases the inlet water amount; conversely, when the outlet water temperature of the outlet pipe 12 is lower than the set outlet water temperature, the servo proportional valve 14 reduces the inlet water flow. The specific control procedure is not limited and described in detail herein.

Through configuration of the internal circulation module 4 and the electric heating module 5, the first water storage container 42 configured by the internal circulation module 4 can meet the requirement of internal circulation when water is suspended, in addition, in the use process, the electric heating module 5 configured on the water outlet pipe 12 can be utilized to perform instant heating treatment on water in the second water storage container 52 by utilizing the electric heating component 51, so that in a scene of small water consumption of a kitchen or the like, only the electric heating module 5 is required to be started to supply hot water without frequently starting a burner, on one hand, the consumption of fuel gas is effectively reduced to be larger due to frequent starting, on the other hand, because the electric heating component 51 is utilized to heat the water in the second water storage container 52, mute heating can be realized, so that the frequent starting of the burner generates larger noise, and further, the energy consumption and the noise influence are reduced, so that the use experience of a user is improved.

In an embodiment of the present application, regarding the installation positions of the relevant components in the housing 1, in order to meet the design requirements for the compactness of the structure and to meet the design requirements for the flow path, the following structural design is made for the installation positions of the first water storage container 42 and the second water storage container 52.

The first water storage container 42 is disposed at one side of the inside of the housing 1 above the water inlet pipe 11, and the second water storage container 52 is disposed at the other side of the inside of the housing 1 above the water outlet pipe 12.

Specifically, the first and second water storage containers 42 and 52 are disposed below the combustion chamber 2 and the first and second water storage containers 42 and 52 are placed by making full use of the space of the casing 1 on both sides below the combustion chamber 2. Wherein, first water storage container 42 is adjacent inlet tube 11 and is located the top of inlet tube 11, and then makes things convenient for inlet tube 11 to be connected with first water storage container 42, realizes that inlet tube 11 carries out water route connection through first water storage container 42 and heat exchanger 3.

In addition, for the second water storage container 52, it is disposed at the other side of the inside of the housing 1 and above the water outlet pipe 12, so that the water outlet pipe 12 can be directly connected with the second water storage container 52 above to facilitate piping connection and shorten the water flow path length of the water outlet of the second water storage container 52.

Meanwhile, in order to meet the requirement of gas supply, the housing 1 of the gas water heater is further provided with a gas inlet pipe 15, and the gas inlet pipe 15 is used for supplying gas to the burner in the combustion chamber 2 for combustion. In order to facilitate the running of the air supply line within the housing 1, the gas inlet pipe 15 is arranged at a position between the first water storage container 42 and the second water storage container 52, so that the gas inlet pipe 15 can arrange the air passage via the space between the first water storage container 42 and the second water storage container 52.

Specifically, the first water storage container 42 is disposed on one side of the gas inlet pipe 15, the second water storage container 52 is disposed on the other side of the gas inlet pipe 15, and the gas inlet pipe 15 is located between the first water storage container 42 and the second water storage container 52.

In another embodiment of the present application, the second water storage container 52 is provided with a first connecting pipe 521 and a second connecting pipe 522, a water outlet of the first connecting pipe 521 is disposed at the bottom of the second water storage container 52, and a water inlet of the second connecting pipe 522 is disposed at the top of the second water storage container 52.

Specifically, in order to improve the temperature constant and the hot water output rate of the water temperature output from the second water storage container 52, the water entering the second water storage container 52 is transferred to the bottom of the second water storage container 52 through the first connection pipe 521. After the water outputted from the first connection pipe 521 flows into the bottom of the second water storage container 52, so that the water at the bottom can be heated from the bottom of the second water storage container 52, and the water in the second water storage container 52 can be uniformly heated by using the principle that the hot water rises.

Meanwhile, by disposing the water outlet of the first connection pipe 521 at the bottom of the second water storage container 52, during heating of the water in the heat exchanger 3 by the burner to input hot water to the second water storage container 52 through the first connection pipe 521. Since a certain amount of water is stored in the second water storage container 52, even if the water temperature outputted from the heat exchanger 3 fluctuates, the water flowing into the second water storage container 52 through the first connection pipe 521 can be mixed with the water stored in the second water storage container 52, so that the fluctuation range of the water outlet temperature of the water outlet pipe 12 can be effectively reduced, and the user experience can be improved.

In another embodiment of the present application, a first mounting hole and a second mounting hole are provided at the top of the second water storage container 52, the first connecting pipe 521 is inserted into the first mounting hole, and the lower end of the first connecting pipe 521 extends to the bottom of the second water storage container 52; the water inlet of the second connecting pipe 522 is connected to the second mounting hole.

Specifically, in order to facilitate the installation of the first connection pipe 521 and the second connection pipe 522, the second water storage container 52 is provided with an installation hole to satisfy the installation requirement of the connection pipe. Wherein, for the first connection pipe 521, a first mounting hole is provided at the top of the second water container 52, and the lower end of the first connection pipe 521 is inserted into the first mounting hole and extends to the bottom of the second water container 52. In this way, the upper end of the first connection pipe 521 is exposed to the top of the second water storage container 52 to facilitate the connection of the pipe with the heat exchanger 3 at the top. The second connection pipe 522 is connected in the second mounting hole of the top to satisfy the water output from the top in the second water storage container 52.

In another embodiment, in order to improve the electric heating efficiency of the electric heating component to meet the heating requirement of increasing the water flow, the electric heating component comprises a first electric heating pipe 501 and a second electric heating pipe 502, wherein the first electric heating pipe and the second electric heating pipe are in a spiral structure, and the first electric heating pipe is sleeved outside the second electric heating pipe;

the first electric heating pipe and the second electric heating pipe are arranged in the water storage container, and the connecting terminals of the first electric heating pipe and the connecting terminals of the second electric heating pipe extend out of the water storage container.

Specifically, two electric heating pipes with spiral structures are assembled into the electric heating component 51, and the electric heating pipes are in spiral structures so as to increase the contact area between the electric heating pipes and water. Meanwhile, the first electric heating pipe 501 is sleeved outside the second electric heating pipe 502, so that the requirement of the overall compact design of the electric heating component is met, and the electric heating component can be further installed in the water storage container 52.

In order to improve the safety and reliability, a protecting cover 524 is further disposed on the second water storage container 52, and covers the connecting terminal of the first electric heating tube 501 and the connecting terminal of the second electric heating tube 502.

In some embodiments, the first electric heating tube comprises two first straight tube sections 5112 and a first spiral section 5111 connected between the two first straight tube sections;

the second electric heating tube comprises two second straight tube sections 5122 and a second spiral section 5121, wherein the second spiral section is connected between the two second straight tube sections;

the first spiral section is sleeved outside the second spiral section, the first spiral section and the second spiral section are located inside the second water storage container, and the first straight pipe section and the second straight pipe section extend out of the second water storage container and are respectively provided with a wiring terminal.

Specifically, taking the first electric heating tube 511 as an example, the first spiral section 5111 has a spiral structure to perform a main heating function, and the first straight tube section 5112 performs a supporting and circuit connection function.

In order to achieve a compact design, one of the straight tube sections passes through the space formed around the second spiral section.

In another embodiment, the second spiral section and the first spiral section are arranged in a staggered manner, and a turbulent flow channel is formed between the second spiral section and the first spiral section.

Specifically, the water in the second water storage container is input through the first connection pipe and output through the second connection pipe, so that the water input through the first connection pipe can be sufficiently heated uniformly by the electric heating part 51 to improve the hot water output rate, and the second spiral section 5121 positioned in the space formed around the first spiral section 5111 is arranged in a staggered manner. When the water flows from the first connection pipe to the second connection pipe along the central line direction of the second water storage container, the projections of the first spiral pipe section 5111 and the second spiral section 5121 perpendicular to the central line direction of the second water storage container are alternately arranged.

In this way, in the process that the water flows through the first spiral pipe section 5111 and the second spiral pipe section 5121, the water flow can be alternately blocked by the first spiral pipe section 5111 and the second spiral pipe section 5121 to play a role of turbulence, so that the water in the second water storage container 52 can be fully mixed and heated uniformly, the output rate of hot water is further improved, and the requirement of the instant heating water flow is increased.

And in order to achieve sufficient heating uniformity, the second helical segment and the first helical segment are positioned between the water outlet of the first connection tube and the water inlet of the second connection tube.

In some embodiments, the bottom of the second water storage container is further provided with a switchable drain 523, said drain 523 extending to the outside of said housing 1.

Specifically, by disposing the drain pipe 523 at the bottom of the second water storage container 52, dirt is easily accumulated at the bottom of the second water storage container 52 after the water heater is used for a long period of time, and dirt in the second water storage container 5252 can be cleaned by opening the drain pipe 523.

In another embodiment, for convenience in fixing the second water storage container 52 in the housing 1, a mounting bracket 525 is further provided on the second water storage container 5 to fix the second water storage container 52 in the housing 1 through the mounting bracket 525.

In another embodiment, the bypass pipe 43 of the internal circulation module 4 is installed in at least two ways, and both ways can meet the requirement of internal circulation.

In a first mode, as shown in fig. 2, in an embodiment of the present application, a first tee pipe is disposed on the first connecting pipe 521, and the first tee pipe is connected to the heat exchanger 3 and the bypass pipe 43 respectively.

Specifically, during the internal circulation, the water output from the heat exchanger 3 flows into the bypass pipe 43 via the first three-way pipe and enters the first water storage container 42. During the internal circulation, the second water storage container 52 does not participate in the operation.

In a second mode, as shown in fig. 1, a second tee pipe is provided on the second connecting pipe 522, and the second tee pipe is connected to the outlet pipe 12 and the bypass pipe 43, respectively.

Specifically, when the internal circulation is performed, the water outputted from the heat exchanger 3 is first introduced into the second water storage container 52, and the water in the second water storage container 52 flows into the bypass pipe 43 via the second three-way pipe and then into the first water storage container 42. During the internal circulation, the second water storage container 52 participates in the operation.

In another embodiment of the present application, the first water storage container 42 is provided with a first connecting pipe 421 and a second connecting pipe 422, a water outlet of the first connecting pipe 421 is disposed at the bottom of the first water storage container 42, and a water inlet of the second connecting pipe 422 is disposed at the top of the first water storage container 42.

Specifically, the outlet of the first connection pipe 421 is disposed at the bottom of the first water storage container 42 to satisfy the requirement that the first water storage container 42 is filled with water from the bottom, and the inlet of the second connection pipe 422 is disposed at the top of the first water storage container 42 to output the water at the top of the first water storage container 42 from the second connection pipe 422.

In an embodiment, the circulating pump 41, the first water storage container 42 and the bypass pipe 43 are sequentially connected, and the circulating pump 41 is connected with the water inlet end of the heat exchanger 3; the bypass pipe 43 is provided with a first electrically controlled valve 44, and the first electrically controlled valve 44 is configured to control the on-off of the bypass pipe 43.

Specifically, the first electric control valve 44 is disposed in the internal circulation module 4, and the on/off of the bypass pipe 43 is controlled by the first electric control valve 44. When the gas water heater is operated for internal circulation, the first electric control valve 44 opens the bypass pipe 43 to circulate water between the heat exchanger 3 and the first water storage container 42 by the circulation pump 41.

The first water storage container 42 is required to satisfy the requirement of the internal circulation flow on the one hand and to serve as a connection member between the heat exchanger 3 and the water inlet pipe 11 on the other hand. For this purpose, the water inlet pipe 11, the first water storage container 42, the circulation pump 41 and the water inlet end of the heat exchanger 3 are connected in sequence.

Specifically, the water flowing in through the water inlet pipe 11 is first introduced into the first water storage container 42, and then flows into the heat exchanger 3.

In the case of the gas water heater having the zero cold water function, the housing 1 is provided with a zero cold water pipe 13, and in this embodiment, the first water storage container 42 is provided with a four-way pipe 45; the zero-cooling water pipe 13 is provided with a second electric control valve 16, and the second electric control valve 16 is configured to control the on-off of the zero-cooling water pipe 13; the four-way pipe 45 is connected to the bypass pipe 43, the water inlet pipe 11 and the zero-cooling water pipe 13, respectively.

Specifically, in the zero-cooling water mode, the water in the external water pipe is heated by the gas water heater, namely, the external circulation is performed. In the internal circulation mode, the water circulation heating in the water path inside the casing 1 is to be realized. By arranging the second electric control valve 16 on the zero-cooling water pipe 13, when the internal circulation is performed, the second electric control valve 16 closes the zero-cooling water pipe 13, so that water in the external water pipe cannot enter the first water storage container 42 through the zero-cooling water pipe 13 after the circulating pump 41 is started, and the water temperature adjusting efficiency of the internal circulation is improved.

In another embodiment, the bypass pipe 43 is provided with a check valve 46, and the check valve 46 is configured to limit the water in the bypass pipe 43 to flow unidirectionally to the first water storage container 42.

In a second embodiment, referring to fig. 1, the present invention further provides a control method of a gas water heater, where the gas water heater has a first water mode and a second water mode;

in the first water mode, after water is started, the electric heating module 5 is electrified and started to heat the water in the second water storage container 52 for instant heating type water supply, and at the moment, the burner is not started;

in the second water mode, after the water is started, the burner starts heating the water flowing in the heat exchanger 3.

Specifically, in the first water mode, taking kitchen water as an example, in a kitchen water scene, the required temperature and flow rate of hot water are lower than the requirements of bath water for a user on water temperature and flow rate. Therefore, the first water mode is started, in this mode, the electric heating module 5 will start to operate, after the user opens the faucet, the water flowing into the water inlet pipe 11 enters the second water storage container 52 through the heat exchanger 3, and the water in the second water storage container 52 is quickly heated by the electric heating component 51, so as to realize instant heating type water supply, and further meet the water demand of water scenes such as kitchen.

In the second water use mode, taking bath water as an example, the water temperature and water flow rate are required to be higher. At this time, the burner is started to burn, and the normal operation of heating water by the gas water heater is performed.

In a certain embodiment, in order to meet the requirement of rapid water consumption of a user, in the second water consumption mode, after the user starts water consumption, the electric heating module 5 and the burner are started simultaneously, and after the water outlet temperature of the heat exchanger 3 reaches a set water outlet temperature value, the electric heating module 5 is powered off to stop running. Therefore, the output quantity of cold water at the initial stage of water consumption of a user can be reduced, so that the requirement of the user for quickly obtaining hot water is met.

In another embodiment of the present application, the control method of the gas water heater further includes: zero cold water mode.

In the zero-cold water mode, the bypass pipe 43 is closed and the circulation pump 41 and the electric heating module 5 are started, and the water inputted from the zero-cold water pipe 13 is sequentially outputted to the external circulation line through the first water storage container 42, the heat exchanger 3 and the second water storage container 52 from the water outlet pipe 12, and the electric heating module 5 heats the water flowing through the second water storage container 52 until the water temperature at the outlet of the first water storage container 42 reaches the first set temperature value T1.

Specifically, since the gas water heater is provided with the electric heating module 5, the water in the external pipeline can be circularly heated by the heat generated by the electric heating of the electric heating module 5 under the zero cold water mode. In this process, the electric heating module 5 can be used to perform the heating water requirement in the zero cold water mode under the condition that the water storage amount and the water temperature lifting amount in the external pipeline are not high, so that the burner can be not started to reduce the running noise.

In another embodiment, the heating power of the electric heating module 5 is limited, and when the water storage amount in the external pipeline and the water temperature increase amount are high, the electric heating module 5 cannot meet the requirement of zero cold water heating, and further depends on the burner to heat the water flowing in the heat exchanger 3.

For this reason, in the zero cold water mode, if the water temperature at the outlet of the first water storage container 42 does not reach the first set temperature value T1 after the circulation pump 41 is started to run for longer than the fifth time period T5, the burner is started until the water temperature at the outlet of the first water storage container 42 reaches the first set temperature value T1.

Specifically, the specific control method of the gas water heater for executing the zero cold water heating function when the burner is started may refer to the control process of the gas water heater for executing the zero cold water mode in the conventional technology, and is not limited herein.

While in the zero cold water mode, the bypass pipe 43 needs to be closed, the circulation pump 41 is started, and the burner and/or the electric heating module 5 is started. The water input by the zero-cooling water pipe 13 enters the heat exchanger 3 through the first water storage container 42 for heating, and the water output by the heat exchanger 3 firstly enters the second water storage container 52 and then is output to an external circulation pipeline through the water outlet pipe 12.

In the normal water use process after the zero cold water mode is finished, the situation that the user turns off water briefly and restarts exists. At this time, in order to avoid that the temperature of the water inside increases too much due to the waste heat in the heat exchanger 3, the internal circulation mode may be performed.

After the water is suspended, the inner loop mode is performed. In the internal circulation mode, the bypass pipe 43 is opened and the circulation pump 41 is started, so that water between the heat exchanger 3, the second water storage container 52 and the first water storage container 42 circulates until the water temperature at the outlet of the first water storage container 42 reaches the second set temperature value T2.

After the zero cold water gas water heater executes the zero cold water mode, a user can use hot water for bathing. There are situations where the user temporarily shuts down the water during the use of hot water. In this process, the conventional technology will execute the zero-cooling water mode again because the water temperature at the water inlet pipe 11 is low, but the water temperature at the water outlet pipe 12 and the water temperature in the water terminal pipeline of the user are still high, and the frequent start of the zero-cooling water mode will cause the increase of energy consumption.

For this reason, when the user temporarily turns off the water during the use of the hot water, an internal circulation mode may be performed, i.e., the bypass pipe 43 is opened and the circulation pump 41 is started so that the water between the heat exchanger 3 and the first water storage container 42 flows circularly, and thus, cold water in the first water storage container 42 is circulated to flow into the heat exchanger 3 to absorb the residual heat of the heat exchanger 3, thereby avoiding excessive fluctuation of the temperature of the discharged water caused by the temperature rise of the residual heat of the heat exchanger 3. Meanwhile, after the user starts again, the burner is started for a certain time, and the hot water in the first water storage container 42 can flow into the heat exchanger 3 and finally be output, so that the condition that the cold water enters the heat exchanger 3 and is not heated and is output from the water outlet pipe 12 in the conventional technology, and the fluctuation of the temperature of the water outlet is overlarge is avoided.

In the internal circulation mode, if the water temperature at the outlet of the first water storage container 42 does not reach the second set temperature value T2 after the circulation pump 41 is started to run for longer than the sixth time T6, the electric heating unit 51 in the electric heating module 5 is started to perform auxiliary heating. In this way, it can be more beneficial to ensure that the water outlet pipe 12 can output constant-temperature hot water after the user uses water again, so as to improve the use experience of the user.

In some embodiments, to avoid frequent initiation of internal circulation during use, after the user pauses the use of water, the bypass pipe 43 is opened and the circulation pump 41 is started, specifically:

after the normal water use time exceeds the first set time t1, after the water use is suspended, the bypass pipe 43 is opened and the circulation pump 41 is started.

Specifically, in the water consumption process of the user, if the water consumption time exceeds the set first set time t1, at this time, after the water consumption of the user is finished and the water is closed, the zero cold water gas water heater can trigger to execute the internal circulation mode, so that the waste of extra energy consumption caused by frequent starting of the internal circulation mode in the frequent starting and stopping water consumption process of the user can be avoided.

In another embodiment, the bypass pipe 43 is opened and the circulation pump 41 is started, specifically: when the starting operation time of the circulating pump 41 exceeds the second set time T2 and the water temperature at the outlet of the first water storage container 42 does not reach the second set temperature value T2, starting the burner until the water temperature at the outlet of the first water storage container 42 reaches the third set temperature value T3, and then shutting down the burner and continuously operating the circulating pump 41 until the water temperature at the outlet of the first water storage container 42 reaches the second set temperature value T2; wherein T2> T3.

Specifically, in the case of executing the internal circulation mode of the zero-cold water gas water heater, the internal circulation mode is triggered to end by determining the operation time of the circulation pump 41 and the water temperature of the water discharged from the first water storage container 42, that is, after the operation of the circulation pump 41 exceeds the second set time T2 and the water temperature at the outlet of the first water storage container 42 exceeds the second set temperature value T2, the internal circulation mode is ended, and the operation of the circulation pump 41 is stopped. Thus, the water inside the zero-cooling water gas water heater can be ensured to be fully and circularly mixed uniformly.

In addition, when the water temperature at the outlet of the first water storage container 42 does not reach the second set temperature value T2 due to the heat absorbed by the water temperature of the first water storage container 42 being large during the execution of the internal circulation mode, the burner needs to be started to assist in heating the heat exchanger 3, and after the burner is started, the burner is stopped after detecting that the water temperature at the outlet of the first water storage container 42 exceeds the third set temperature value T3, and the circulation pump 41 continues to operate to absorb the waste heat of the heat exchanger 3, so that the water temperature at the outlet of the first water storage container 42 continuously rises until the water temperature exceeds the second set temperature value T2, and the circulation pump 41 is stopped.

In other embodiments, during normal water usage after the zero cold water mode is performed, after the water consumption is suspended for more than the third set time t3, if the water temperature at the outlet of the first water storage container 42 is lower than the set starting water temperature value Ts, the zero cold water mode is performed again;

Wherein t3> t 2; t3> Ts; t1> Ts.

Specifically, after the user turns off the water, whether or not the internal circulation mode is executed, after the water is suspended for more than the third set time t3, the temperature drop amplitude of the water in the pipeline between the water outlet pipe 12 and the water use terminal becomes large, and at this time, the zero cold water mode needs to be executed again.

In some embodiments, after shutting down the burner and the circulation pump 41 is continuously operated until the water temperature at the outlet of the first water storage container 42 reaches the second set temperature value T2, specifically:

in the continuous operation process of turning off the burner circulation pump 41, if the water temperature at the outlet of the heat exchanger 3 is higher than the fourth set temperature value T4 and the water temperature at the outlet of the first water storage container 42 is higher than T2, the bypass pipe 43 is closed and the flow path between the zero-cooling water pipe 13 and the circulation pump 41 is opened first, after the circulation pump 41 is started to operate for longer than the fourth time T4, the bypass pipe 43 is opened and the flow path between the zero-cooling water pipe 13 and the circulation pump 41 is closed, and the circulation pump 41 continues to operate until the water temperature at the outlet of the heat exchanger 3 is lower than T5 and the water temperature at the outlet of the first water storage container 42 is higher than T2.

Wherein t3> t4; t4> T5> T2.

Specifically, in the internal circulation mode, when the burner is started to perform auxiliary heating, there is an excessive heat generated by the burner, which results in an excessive overall water temperature inside the internal circulation mode, and at this time, a certain amount of cold water can be introduced through the zero-cold water pipe 13 to further reduce the internal water temperature. That is, if the water temperature at the outlet of the heat exchanger 3 is higher than the fourth set temperature value T4 and the water temperature at the outlet of the first water storage container 42 is higher than T2, the water temperature caused by excessive waste heat generated by the heat exchanger 3 due to heating of the burner is too high, at this time, the bypass pipe 43 can be closed and the flow path between the zero-cooling water pipe 13 and the circulation pump 41 can be opened, a certain amount of cold water is introduced through the zero-cooling water pipe 13 under the action of the circulation pump 41, so that the overall water temperature of the internal circulation water is reduced, and finally, the fluctuation of the water outlet temperature when the user uses water again is smaller, thereby improving the user experience.

The specific values of the set temperature and the set time may be obtained by tests according to different models, and are not limited herein.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention 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:

the shell is provided with a water inlet pipe and a water outlet pipe;

a burner for combusting a fuel gas;

the heat exchanger is used for heat exchange of water supply flow;

the internal circulation module comprises a circulation pump, a first water storage container and a bypass pipe, wherein the first water storage container is connected between the circulation pump and the bypass pipe and forms an internal flow path;

an electrical heating module comprising an electrical heating component and a second water reservoir, the electrical heating component configured to energize heating water in the second water reservoir;

The inner flow path is connected with the heat exchanger and forms an inner circulation flow path, and the second water storage container is connected between the heat exchanger and the water outlet pipe.

2. The gas water heater according to claim 1, wherein a first connecting pipe and a second connecting pipe are arranged on the second water storage container, a water outlet of the first connecting pipe is arranged at the bottom of the second water storage container, and a water inlet of the second connecting pipe is arranged at the top of the second water storage container.

3. The gas water heater according to claim 2, wherein a first mounting hole and a second mounting hole are provided at a top of the second water storage container, the first connecting pipe is inserted in the first mounting hole, and a lower end portion of the first connecting pipe extends to a bottom of the second water storage container; and a water inlet of the second connecting pipe is connected with the second mounting hole.

4. The gas water heater of claim 2, wherein the electrical heating component is an electrical heating tube having a straight tube section and a spiral section, the spiral section being disposed on the straight tube section, the straight tube section extending through the second water storage vessel, the spiral section being disposed between the water inlet of the first connection tube and the water outlet of the second connection tube.

5. The gas water heater according to claim 1, wherein the circulation pump, the first water storage container and the bypass pipe are connected in sequence, and the circulation pump is connected with the water inlet end of the heat exchanger;

the bypass pipe is provided with a first electric control valve, and the first electric control valve is configured to control the on-off of the bypass pipe.

6. The gas water heater as recited in claim 2, wherein a first tee is provided on the first connecting tube, the first tee being connected to the heat exchanger and the bypass tube, respectively.

7. A gas water heater according to claim 3, wherein a second tee is provided on the second connection pipe, the second tee being connected to the outlet pipe and the bypass pipe respectively.

8. The gas water heater of claim 1, wherein the water inlet pipe, the first water storage container, the circulation pump and the water inlet end of the heat exchanger are connected in sequence.

9. The gas water heater as recited in claim 8, wherein the first water storage container is provided with a four-way pipe;

the shell is provided with a zero-cooling water pipe, the zero-cooling water pipe is provided with a second electric control valve, and the second electric control valve is configured to control the on-off of the zero-cooling water pipe;

The four-way pipe is respectively connected with the bypass pipe, the water inlet pipe and the zero-cooling water pipe.

10. A control method of a gas water heater as claimed in any one of claims 1 to 9, comprising: a first water mode and a second water mode;

in the first water mode, after water is started, the electric heating module is electrified and started to heat water in the second water storage container for instant heating type water supply, and at the moment, the burner is not started;

in the second water mode, after water is started, the burner is started to heat water flowing in the heat exchanger.