CN117387222A

CN117387222A - Control method of gas water heater

Info

Publication number: CN117387222A
Application number: CN202311270955.4A
Authority: CN
Inventors: 李桂林; 邵亚龙; 方欢; 贾晓铭; 黄晓东; 于宗超; 王大利
Original assignee: Chongqing Haier Water Heater Co Ltd; Haier Smart Home Co Ltd; Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Current assignee: Chongqing Haier Water Heater Co Ltd; Haier Smart Home Co Ltd; Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2024-01-12

Abstract

The invention discloses a control method of a gas water heater. The control method comprises the following steps: a zero cold water mode; and under the zero cold water mode, the bypass pipe is closed, the circulating pump and the electric heating component are started, water input by the zero cold water pipe is sequentially output to an external circulating pipeline through the first water storage tank, the heat exchanger and the second water storage tank and from the water outlet pipe, and the electric heating module heats water flowing through the second water storage tank until the water temperature at the outlet of the first water storage tank reaches a first set temperature value T1. The energy consumption and the noise are reduced, and the user experience of the zero-cooling water gas water heater is improved.

Description

Control method of gas water heater

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to a control method of 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, a combustion chamber, and a heat exchanger, where the burner combusts gas to heat water flowing through the heat exchanger.

The gas water heater in the prior art generally has a zero cold water function, after the zero cold water function is started, the gas is combusted by the burner to heat the water in the heat exchanger, and the water in the outer pipeline is driven to circularly flow into the heat exchanger through the circulating pump to perform heating treatment. However, in the actual use process, the zero cold water is frequently started due to water consumption of a user, and the burner needs to be frequently ignited, so that the gas water heater has high operation noise and high energy consumption.

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 control method of a gas water heater, which can reduce energy consumption and noise and improve the 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 control method of a gas water heater having a water outlet pipe, a water inlet pipe, and a zero-cold water pipe, the gas water heater including a burner, a heat exchanger, an internal circulation module including a circulation pump, a first water storage tank, and a bypass pipe, and an electrical heating module including an electrical heating component configured to heat water in a second water storage tank, and a second water storage tank; the circulating pump, the first water storage tank and the bypass pipe are connected with the heat exchanger to form an internal circulation flow path, the second water storage tank is connected between the heat exchanger and the water outlet pipe, and the water inlet pipe and the zero-cooling water pipe are respectively connected with the first water storage tank;

The control method comprises the following steps: a zero cold water mode;

and under the zero cold water mode, the bypass pipe is closed, the circulating pump and the electric heating component are started, water input by the zero cold water pipe is sequentially output to an external circulating pipeline through the first water storage tank, the heat exchanger and the second water storage tank and from the water outlet pipe, and the electric heating module heats water flowing through the second water storage tank until the water temperature at the outlet of the first water storage tank reaches a first set temperature value T1.

In the zero cooling water mode, the electric heating module is adopted to heat the water flowing through the second water outlet tank, and the heat generated by electrifying the electric heating component of the electric heating module is used to meet the requirement that the water in the external water pipe circularly flows into the gas water heater for heating in the zero cooling water mode; especially, the user triggers and starts the zero cold water mode in the water using process, because the water in the external water pipe is heated when the machine is started, the zero cold water function is started again in the user process, and the electric heating component is utilized to electrify and heat the water in the external water pipe, so that the heating requirement of the zero cold water can be met, a burner is not required to be started frequently, the energy consumption and the noise are reduced, and the user experience of the zero cold water gas water heater is improved.

In an embodiment of the present application, the control method further includes:

in the normal water use process after the zero cold water mode is finished, after water use is suspended, a bypass pipe is opened, and a circulating pump is started, so that water between the heat exchanger and the first water storage tank circularly flows until the water temperature at the outlet of the first water storage tank reaches a second set temperature value T2.

In one embodiment of the present application, after the user pauses the use of water, the bypass pipe is opened and the circulation pump is started, specifically:

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

In an embodiment of the present application, the bypass pipe is opened and the circulation pump is started, specifically: when the starting operation time of the circulating pump exceeds the second set time T2 and the water temperature of the outlet of the first water storage tank does not reach the second set temperature value T2, starting the burner until the water temperature of the outlet of the first water storage tank reaches the third set temperature value T3, and then stopping the burner and continuously operating the circulating pump until the water temperature of the outlet of the first water storage tank reaches the second set temperature value T2;

wherein T2> T3.

In an embodiment of the present application, in a normal water use process after the execution of the zero-cold water mode is finished, after the water consumption is suspended for more than a third set time t3, if the water temperature at the outlet of the first water storage tank is lower than a set starting water temperature value Ts, the zero-cold water mode is executed again;

Wherein t3> t2; t3> Ts; t1> Ts.

In this embodiment of the present application, when the burner is turned off and the circulation pump continues to operate until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2, specifically:

when the burner is turned off and the circulating pump continuously operates, if the water temperature at the outlet of the heat exchanger is higher than a fourth set temperature value T4 and the water temperature at the outlet of the first water storage tank is higher than T2, the bypass pipe is closed and a flow path between the zero cold water pipe and the circulating pump is opened firstly, after the circulating pump is started to operate for longer than a fourth time T4, the bypass pipe is opened and the flow path between the zero cold water pipe and the circulating pump is closed, and the circulating pump continuously operates until the water temperature at the outlet of the heat exchanger is lower than T5 and the water temperature at the outlet of the first water storage tank is higher than T2;

wherein t3> t4; t4> T5> T2.

In one embodiment of the present application, after the user pauses the use of water, the bypass pipe is opened and the circulation pump is started, specifically: if the time length of the circulating pump during starting operation is longer than the sixth time length T6, after the water temperature at the outlet of the first water storage tank does not reach the second set temperature value T2, the electric heating component in the electric heating module is started to perform auxiliary heating until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2.

when water is reused after the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2, the burner is started after a seventh time period T7.

In an embodiment of the present application, in a zero cold water mode executed for the first time after each start of the gas water heater, the burner is started until the water temperature at the outlet of the first water storage tank reaches a first set temperature value T1.

In an embodiment of the present application, in the zero cold water mode, if the water temperature at the outlet of the first water storage tank does not reach the first set temperature value T1 after the circulating pump 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 tank reaches the first set temperature value T1.

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 tank in FIG. 3;

fig. 6 is a cross-sectional view of the first water storage tank of fig. 3;

fig. 7 is a schematic structural view of the second water storage tank in fig. 3;

fig. 8 is a cross-sectional view of the second water storage tank of fig. 3;

fig. 9 is an exploded view of the second water storage tank 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; 21. a burner;

3. a heat exchanger;

4. an internal circulation module; 41. a circulation pump; 42. a first water storage tank; 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 tank; 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 tank 42, and a bypass pipe 43, the first water storage tank 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 using process of the user, when the user turns off the water temporarily, 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 tank 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 the boiled water next time is met.

In addition, in order to reduce the number of ignition starts of the burner according to the water demand to reduce the energy consumption and the noise in the use process, 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 tank 52, the electric heating part 51 is arranged on the second water storage tank 52 and is configured to electrically heat the water in the second water storage tank 52, and the second water storage tank 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 tank 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 tank 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 disposing the inner circulation module 4 and the electric heating module 5, the first water storage tank 42 disposed in the inner circulation module 4 can meet the requirement of inner circulation when water is suspended, in addition, in the use process, the electric heating module 5 disposed on the water outlet pipe 12 can perform instant heating treatment on water in the second water storage tank 52 by utilizing the electric heating component 51, so that in the 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 tank 52, mute heating can be realized, so that the frequent starting of the burner generates larger noise, and further, the energy consumption and noise influence are reduced to improve the use experience of users.

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 the design requirements for the flow path, the following structural design is made for the installation positions of the first water storage tank 42 and the second water storage tank 52.

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

Specifically, the first and second water storage tanks 42 and 52 are disposed below the combustion chamber 2 and the first and second water storage tanks 42 and 52 are placed using the space of the housing 1 on both sides below the combustion chamber 2. Wherein, first water storage tank 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 tank 42, realizes that inlet tube 11 carries out water route connection through first water storage tank 42 and heat exchanger 3.

In addition, for the second water storage tank 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 tank 52 above to facilitate piping connection and shorten the water flow path length of the water outlet of the second water storage tank 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 and second water storage tanks 42 and 52 such that the gas inlet pipe 15 can arrange the air passage via the space between the first and second water storage tanks 42 and 52.

Specifically, the first water storage tank 42 is disposed at one side of the gas intake pipe 15, the second water storage tank 52 is disposed at the other side of the gas intake pipe 15, and the gas intake pipe 15 is located between the first water storage tank 42 and the second water storage tank 52.

In another embodiment of the present application, the second water storage tank 52 is provided with a first connection pipe 521 and a second connection pipe 522, a water outlet of the first connection pipe 521 is disposed at the bottom of the second water storage tank 52, and a water inlet of the second connection pipe 522 is disposed at the top of the second water storage tank 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 tank 52, the water that has entered the second water storage tank 52 is transferred to the bottom of the second water storage tank 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 tank 52, so that the water at the bottom can be heated from the bottom of the second water storage tank 52, and the water in the second water storage tank 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 tank 52, during heating of the water in the heat exchanger 3 by the burner to input hot water to the second water storage tank 52 through the first connection pipe 521. Since a certain amount of water is stored in the second water storage tank 52, even if the water temperature outputted from the heat exchanger 3 fluctuates, the water flowing into the second water storage tank 52 through the first connection pipe 521 can be mixed with the water already stored in the second water storage tank 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 tank 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 tank 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 tank 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 storage tank 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 storage tank 52. In this way, the upper end portion of the first connection pipe 521 is exposed to the top of the second water storage tank 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 tank 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 tank, and the connecting terminal of the first electric heating pipe and the connecting terminal of the second electric heating pipe extend out of the water storage tank.

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 tank 52.

In order to improve the safety and reliability, a protective cover 524 is further disposed on the second water storage tank 52, and covers the connection terminal of the first electric heating tube 501 and the connection 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 tank, and the first straight pipe section and the second straight pipe section extend out of the second water storage tank 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 tank is input through the first connection pipe and output through the second connection pipe, so that the second spiral segment 5121 located in the space formed around the first spiral segment 5111 is arranged in a staggered manner in order to ensure that the water input through the first connection pipe can be sufficiently heated uniformly by the electric heating part 51 to increase the hot water output rate. When the water flows from the first connection pipe to the second connection pipe along the central line direction of the second water storage tank, 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 tank 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 tank 52 can be fully mixed and heated uniformly, and the output rate of hot water is improved, so that 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 tank 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 tank 52, dirt is easily accumulated at the bottom of the second water storage tank 52 after the water heater is used for a long period of time, and dirt in the second water storage tank 5252 can be cleaned by opening the drain pipe 523.

In another embodiment, for convenience in fixing the second water storage tank 52 in the housing 1, a mounting bracket 525 is further provided on the second water storage tank 5 to fix the second water storage tank 52 in the housing 1 by 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 tank 42. During the internal circulation, the second water storage tank 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, during the internal circulation, the water output from the heat exchanger 3 enters the second water storage tank 52, and the water in the second water storage tank 52 flows into the bypass pipe 43 via the second three-way pipe and then enters the first water storage tank 42. During the internal circulation, the second water storage tank 52 participates in the operation.

In another embodiment of the present application, the first water storage tank 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 tank 42, and a water inlet of the second connecting pipe 422 is disposed at the top of the first water storage tank 42.

Specifically, the outlet of the first connection pipe 421 is disposed at the bottom of the first water storage tank 42 to satisfy the requirement that the first water storage tank 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 tank 42 to allow the water at the top of the first water storage tank 42 to be outputted from the second connection pipe 422.

In an embodiment, the circulating pump 41, the first water storage tank 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 performs an internal circulation operation, the first electric control valve 44 opens the bypass pipe 43 to circulate water between the heat exchanger 3 and the first water storage tank 42 by the circulation pump 41.

The first water storage tank 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 intake pipe 11 on the other hand. For this purpose, the water inlet pipe 11, the first water storage tank 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 introduced into the first water storage tank 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 tank 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 tank 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 to the first water storage tank 42 in one direction.

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 tank 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 tank 52 through the heat exchanger 3, and the water in the second water storage tank 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 a 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 from the water outlet pipe 12 to the external circulation line through the first water storage tank 42, the heat exchanger 3 and the second water storage tank 52, and the electric heating module 5 heats the water flowing through the second water storage tank 52 until the water temperature at the outlet of the first water storage tank 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 tank 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 tank 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 tank 42 for heating, and the water output by the heat exchanger 3 firstly enters the second water storage tank 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 the water between the heat exchanger 3, the second water storage tank 52 and the first water storage tank 42 circulates until the water temperature at the outlet of the first water storage tank 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 tank 42 flows circularly, and thus, cold water in the first water storage tank 42 is circulated into the heat exchanger 3 to absorb the residual heat of the heat exchanger 3, thereby avoiding excessive fluctuation in the temperature of the discharged water caused by the temperature rise of the residual heat of the heat exchanger 3.

After the internal circulation mode is performed, the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2. When the user starts the water again, the burner is started after a seventh time period t 7.

Specifically, since the hot water in the first water storage tank 42 flows into the heat exchanger 3 when the user uses water again, the burner is started for a certain time delay, so that the hot water in the first water storage tank 42 can flow into the heat exchanger 3 without being heated and finally output. The method can ensure small fluctuation of the outlet water temperature, can avoid overlarge fluctuation of the outlet water temperature caused by the fact that the hot water in the first water storage tank 42 enters the heat exchanger and is heated again due to the fact that the combustor is started too early, and can also avoid overlarge fluctuation of the outlet water temperature caused by the fact that cold water enters the heat exchanger 3 and is not heated and is output from the water outlet pipe 12 in the conventional technology.

In the internal circulation mode, if the water temperature at the outlet of the first water storage tank 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 tank 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 tank 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 tank 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 operation time of the circulation pump 41 and the water temperature of the water discharged from the first water storage tank 42 are determined to trigger the end of the internal circulation mode, 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 tank 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 tank 42 does not reach the second set temperature value T2 due to the large amount of heat absorbed by the water temperature of the first water storage tank 42 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 tank 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 tank 42 continues to rise 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 tank 42 is lower than the set start 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 the burner is turned off and the circulation pump 41 is continuously operated until the water temperature at the outlet of the first water storage tank 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 tank 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 tank 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 tank 42 is higher than T2, the water temperature caused by excessive waste heat generated by the heat exchanger 3 is too high due to heating of the burner, at this time, the bypass pipe 43 can be closed and the flow path between the zero cold water pipe 13 and the circulation pump 41 can be opened, a certain amount of cold water is introduced through the zero cold 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

1. A control method of a gas water heater, characterized in that the gas water heater is provided with a water outlet pipe, a water inlet pipe and a zero-cooling water pipe, the gas water heater comprises a burner, a heat exchanger, an internal circulation module and an electric heating module, the internal circulation module comprises a circulation pump, a first water storage tank and a bypass pipe, the electric heating module comprises an electric heating component and a second water storage tank, and the electric heating component is configured to heat water in the second water storage tank; the circulating pump, the first water storage tank and the bypass pipe are connected with the heat exchanger to form an internal circulation flow path, the second water storage tank is connected between the heat exchanger and the water outlet pipe, and the water inlet pipe and the zero-cooling water pipe are respectively connected with the first water storage tank;

The control method comprises the following steps: a zero cold water mode;

2. The control method of a gas water heater according to claim 1, further comprising:

3. The control method of a gas water heater according to claim 2, wherein after the user pauses the water use, the bypass pipe is opened and the circulation pump is started, in particular:

4. The control method of a gas water heater according to claim 2, characterized in that the bypass pipe is opened and the circulation pump is started, in particular: when the starting operation time of the circulating pump exceeds the second set time T2 and the water temperature of the outlet of the first water storage tank does not reach the second set temperature value T2, starting the burner until the water temperature of the outlet of the first water storage tank reaches the third set temperature value T3, and then stopping the burner and continuously operating the circulating pump until the water temperature of the outlet of the first water storage tank reaches the second set temperature value T2;

Wherein T2> T3.

5. The control method of a gas water heater according to claim 4, wherein in the normal water use process after the zero cold water mode is performed, if the water temperature at the outlet of the first water storage tank is lower than the set start water temperature value Ts after the water use is suspended for more than the third set time t3, the zero cold water mode is re-performed;

wherein t3> t2; t3> Ts; t1> Ts.

6. The control method of a gas water heater according to claim 4, wherein after shutting down the burner and the circulating pump is continuously operated until the water temperature at the outlet of the first water storage tank reaches a second set temperature value T2, specifically:

wherein t3> t4; t4> T5> T2.

7. The control method of a gas water heater according to claim 2, wherein after the user pauses the water use, the bypass pipe is opened and the circulation pump is started, in particular: if the time length of the circulating pump during starting operation is longer than the sixth time length T6, after the water temperature at the outlet of the first water storage tank does not reach the second set temperature value T2, the electric heating component in the electric heating module is started to perform auxiliary heating until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2.

8. The control method of a gas water heater according to claim 2, characterized in that the control method further comprises:

9. The control method of a gas water heater according to any one of claims 1 to 8, wherein the burner is started until the water temperature at the outlet of the first water storage tank reaches a first set temperature value T1 in a zero cold water mode performed for the first time after each start-up of the gas water heater.

10. A control method of a gas water heater according to any one of claims 1 to 8,

in the zero cold water mode, if the water temperature at the outlet of the first water storage tank does not reach the first set temperature value T1 after the circulating pump is started to run for longer than the fifth time T5, starting the burner until the water temperature at the outlet of the first water storage tank reaches the first set temperature value T1.