CN117232146A

CN117232146A - Gas water heater and control method thereof

Info

Publication number: CN117232146A
Application number: CN202310961708.2A
Authority: CN
Inventors: 方欢; 陈如意; 冯青; 赵鹏
Original assignee: Haier Smart Home Co Ltd; Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Current assignee: Haier Smart Home Co Ltd; Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Priority date: 2022-12-29
Filing date: 2023-08-01
Publication date: 2023-12-15
Also published as: CN117232144A; CN117232145A; CN220892565U; CN117053411A; CN117190503A; CN116989476A

Abstract

The invention discloses a gas water heater and a control method thereof, wherein the gas water heater comprises: the shell is provided with a water inlet pipe, a water outlet pipe and a water outlet pipe; the bottom of the combustion chamber is provided with a burner; a heat exchanger comprising a first heat exchange tube for heat exchange with the water supply flow; the condensing heat exchanger comprises a shell and a second heat exchange tube, a flue gas inlet and a flue gas outlet are formed in the shell, a first air deflector is arranged in the shell and covers the lower part of the flue gas outlet, a space is formed between the first air deflector and the flue gas outlet, the fixed end part of the first air deflector is arranged on the inner wall of the shell, and the free end part of the first air deflector is provided with a flanging structure extending downwards; the second heat exchange tube is arranged in the shell, is positioned below the first air deflector, and is further provided with a drainage joint on the bottom plate of the shell. The heat exchange efficiency of the gas water heater is improved, so that the energy consumption of the gas water heater is reduced.

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, water heaters are household appliances commonly used in daily life of people, and the water heaters can be divided into gas water heaters, electric water heaters and solar water heaters according to different heat sources. In the use process, the hot water output by the water heater is output for a user to use through a user terminal (such as a faucet or a shower).

The heat exchanger in a gas water heater serves as an important component for heating the water flowing through. Chinese patent publication No. CN101545679a discloses a secondary heat exchanger of a condensing gas water heater, in the actual use process, high temperature flue gas generated after combustion of gas enters the heat exchanger and exchanges heat with an internal second heat exchange tube. However, when the flue gas exchanges heat with the second heat exchange tube of the heat exchanger, the heat exchange efficiency of the second heat exchange tube close to the air inlet is higher, and the heat exchange efficiency of the second heat exchange tube far away from the air inlet is lower, so that the heat of the flue gas is not fully utilized, and the overall heat exchange efficiency of the heat exchanger is lower.

In view of this, how to design a technology for improving the heat exchange efficiency of the heat exchanger to reduce the energy consumption of the gas water heater is a technical problem to be solved by the present invention.

Disclosure of Invention

The invention provides a gas water heater and a control method thereof, which are used for improving the heat exchange efficiency of the gas water heater so as to reduce the energy consumption of the 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, a water outlet pipe and a water outlet pipe;

the bottom of the combustion chamber is provided with a burner which is used for burning fuel gas;

a heat exchanger comprising a first heat exchange tube for water supply flow heat exchange;

the condensing heat exchanger comprises a shell and a second heat exchange tube, wherein a flue gas inlet and a flue gas outlet are formed in the shell, a first air deflector is arranged in the shell, the first air deflector covers the lower part of the flue gas outlet, a space is formed between the first air deflector and the flue gas outlet, the fixed end part of the first air deflector is arranged on the inner wall of the shell, and the free end part of the first air deflector is provided with a flanging structure extending downwards; the second heat exchange tube is arranged in the shell, the second heat exchange tube is positioned below the first air deflector, and a drain connector is further arranged on the bottom plate of the shell;

the combustion chamber is arranged in the shell, the first heat exchange pipe is arranged on the combustion chamber and is positioned above the burner, the shell covers the top of the combustion chamber, and the flue gas inlet is communicated with the combustion chamber; the water inlet pipe, the second heat exchange pipe, the first heat exchange pipe and the water outlet pipe are sequentially communicated, and the water drainage joint is communicated with the water drainage pipe.

In an embodiment of the present application, the first air deflector is provided with a plurality of first air vents, and the first air vents are far away from the fixed end of the first air deflector.

In an embodiment of the application, a second air deflector is arranged in the shell, the second air deflector covers the upper part of the flue gas inlet and is positioned at the lower part of the first air deflector, a plurality of second ventilation holes are formed in the second air deflector, and the second heat exchange tube is positioned between the second air deflector and the flanging structure.

In one embodiment of the application, the device further comprises a gas collecting hood, wherein the top of the gas collecting hood is provided with a communication port, the gas collecting hood is arranged at the bottom of the shell, and the communication port is communicated with the flue gas inlet; the gas-collecting channel covers the top of the combustion chamber.

In an embodiment of the application, the bottom plate of the shell is arranged obliquely, the flue gas inlet and the drain connector are arranged on the bottom plate of the shell, the flue gas inlet is positioned at a high side position of the bottom plate of the shell, and the drain connector is positioned at a low side position of the bottom plate of the shell.

In an embodiment of the application, the top surface of the gas-collecting hood is arranged obliquely, and the communication port is arranged at a high side position of the top surface of the gas-collecting hood.

In one embodiment of the application, the shell is also provided with a zero cooling water pipe; the gas water heater is also provided with a circulating pump, an inlet of the circulating pump is respectively communicated with the zero-cooling water pipe and the water inlet pipe, and an outlet of the circulating pump is communicated with the second heat exchange pipe.

In an embodiment of the application, the heat exchange device further comprises a bypass pipe, wherein one pipe orifice of the bypass pipe is connected with the water outlet pipe and the first heat exchange pipe through a three-way pipe, the other pipe orifice of the bypass pipe is connected with the water outlet pipe and the first heat exchange pipe through a four-way pipe, and an electric control valve is arranged on the bypass pipe.

In another aspect, the present application further provides a control method of the gas water heater, including:

in the process of powering on and using water for the zero-cold water gas water heater, after water is suspended, when the time length of water suspension is longer than the first time length t1, the circulating pump is started, so that water stored in the zero-cold water gas water heater circularly flows among the water inlet pipe, the heat exchanger and the water outlet pipe.

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

in the zero cold water mode, the bypass pipe is closed, the circulating pump and the burner are started, water input by the zero cold water pipe enters the first heat exchange pipe through the second heat exchange pipe to be heated, and the water heated in the first heat exchange pipe is output to the external circulating pipeline through the water outlet pipe until the water temperature at the outlet of the second heat exchange pipe reaches a first set temperature value T1;

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

Compared with the prior art, the utility model has the advantages and positive effects that: shielding below the flue gas outlet by arranging the first air deflector in the shell, and further arranging a flanging structure on the first air deflector, in the use process, flue gas enters the shell through the flue gas inlet and then contacts with the heat exchange tube below the first air deflector for heat exchange, and the flue gas cannot continuously rise and is further limited by the flanging structure due to the limitation of the first air deflector in the rising process, so that the flue gas has a downward flowing trend in the shell, and the flue gas can exchange heat with the heat exchange tube below the first air deflector sufficiently, thereby improving the heat exchange efficiency of the condensing heat exchanger and reducing the energy consumption of the gas water heater.

Drawings

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

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

FIG. 2 is an assembled view of a combustion chamber, heat exchanger and condensing heat exchanger in an embodiment of the heat exchanger of the present invention;

FIG. 3 is a second view of an assembly of a combustion chamber, a heat exchanger and a condensing heat exchanger in an embodiment of a heat exchanger according to the present invention;

FIG. 4 is an assembled exploded view of the combustor, heat exchanger and condensing heat exchanger of FIG. 2;

FIG. 5 is a schematic view of the condensing heat exchanger of FIG. 2;

FIG. 6 is one of the cross-sectional views of the condensing heat exchanger of FIG. 2;

FIG. 7 is one of the cross-sectional views of the condensing heat exchanger of FIG. 2;

FIG. 8 is an exploded view of the condensing heat exchanger of FIG. 2;

FIG. 9 is a schematic view of the gas hood of FIG. 8;

FIG. 10 is a second schematic diagram of a gas water heater according to an embodiment of the present invention;

FIG. 11 is a schematic view of the heating assembly of FIG. 10;

FIG. 12 is a cross-sectional view of the heating assembly of FIG. 10;

FIG. 13 is a schematic view of another embodiment of the gas water heater of the present invention.

Reference numerals illustrate:

1. a housing; 11. a water inlet pipe; 12. a water outlet pipe; 13. zero cooling water pipe; 14. a drain pipe; 15. A heat radiation hole; 16. a circulation pump; 17. a bypass pipe;

2. a combustion chamber; 21. a first mounting frame; 22. a first flanging; 23. a recessed structure;

3. A heat exchanger; 31. a first heat exchange tube;

4. a condensing heat exchanger; 41. a housing; 42. a second heat exchange tube; 43. a gas collecting hood;

415. a drain joint; 416. a third mounting frame; 416. a first connection frame; 431. a communication port; 432. a second flanging; 433. a second mounting frame; 434. a second connecting frame;

5. a heating assembly; 51. a temporary storage box; 52. an electric heating member; 53. an overflow plate; 54. a first connection pipe; 55. a second connection pipe; 56. a blow-down pipe; 57. a plug;

511. a first water chamber; 512. and a second water chamber.

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 specifically stated and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, either 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 second heat exchange tube, one end of the second heat exchange tube is communicated with a water supply pipeline, and the other end of the second heat exchange tube is communicated with a shower head or a tap.

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

When the gas water heater works, cold water provided by the water supply pipeline flows into the second heat exchange tube, 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 a user 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.

As shown in fig. 1 to 9, in an embodiment of the present application, there is provided a gas water heater, including:

a shell 1, wherein a water inlet pipe 11, a water outlet pipe 12 and a water outlet pipe 14 are arranged on the shell 1;

a combustion chamber 2, wherein a burner (not shown) for burning fuel gas is provided at the bottom of the combustion chamber 2;

a heat exchanger 3, the heat exchanger 3 comprising a first heat exchange tube 31, the first heat exchange tube 31 for water supply flow heat exchange;

the condensing heat exchanger 4, wherein the condensing heat exchanger 4 comprises a shell 41 and a second heat exchange tube 42, a flue gas inlet and a flue gas outlet are arranged on the shell 41, a drain connector 415 is also arranged on a bottom plate of the shell 41, and the second heat exchange tube 42 is arranged in the shell 41;

The combustion chamber 2 is arranged in the shell 1, the first heat exchange tube 31 is arranged on the combustion chamber 2 and is positioned above the burner, the water inlet tube 11, the second heat exchange tube 42, the first heat exchange tube 31 and the water outlet tube 12 are sequentially communicated, and the water outlet joint 415 is communicated with the water outlet tube 14.

In order to improve the heat exchange efficiency of the condensing heat exchanger and reduce the energy consumption of the gas water heater, the following structural improvement design is performed on the condensing heat exchanger.

The condensing heat exchanger 4 includes: the flue gas purifying device comprises a shell 41, wherein a flue gas inlet 411 and a flue gas outlet 412 are formed in the shell 41, a first air deflector 413 is arranged in the shell 41, the first air deflector 413 covers the lower part of the flue gas outlet 412, a space is formed between the first air deflector 413 and the flue gas outlet 412, the fixed end part of the first air deflector 413 is arranged on the inner wall of the shell 41, and the free end part of the first air deflector 413 is provided with a flanging structure 4131 extending downwards;

a second heat exchange tube 42, the second heat exchange tube 42 being disposed in the housing 41 below the first air deflector 413.

Specifically, during the actual assembly process, the second heat exchange tube 42 is placed in the housing 41 and disposed below the first air deflector 413. In use, the condensing heat exchanger is arranged in the shell of the gas water heater and above the combustion chamber. The high temperature flue gas generated by combustion of the gas in the combustion chamber enters the housing 41 via the flue gas inlet 411.

Wherein the high temperature flue gas entering the housing 41 will exchange heat with the second heat exchange tube 42, but the high temperature flue gas is limited by the blocking of the first air deflector 413 and not directly output from the flue gas outlet 412 at the top. Under the action of the first air deflector 413, the flue gas is confined to the bottom of the first air deflector 413, so that the flue gas can sufficiently exchange heat with the second heat exchange tube 42. The free end of the first air deflector 413 is provided with a flange structure 4131 extending downward, and the flue gas forced into the housing 41 by the flange structure 4131 bypasses the lower edge of the flange structure 4131 and is output from the flue gas outlet 412, so that the heat exchange time between the flue gas and the second heat exchange tube 42 is prolonged to the maximum extent.

In another embodiment, the lower edge of the flanging structure 4131 is further provided with a bending edge 4132 bending towards the second heat exchange tube direction.

Specifically, during the downward flow of the flue gas via the lower edge of the flanging structure 4131, the flue gas may be guided by the bending edge 4132 to further flow upwards, so that the flue gas forms a vortex at the bending edge 4132, so that the flue gas can sufficiently exchange heat with the second heat exchange tube and the heat exchange time is prolonged.

In one embodiment of the present application, the first air deflector 413 extends obliquely downward from the fixed end toward the free end.

Specifically, in order to reduce wind resistance to the flue gas and guide the flue gas to smoothly flow in the housing 41, the first air deflector 413 is disposed in the housing 41 in an inclined arrangement. The fixed end position of the first air deflector 413 is higher, and after the flue gas enters the housing 41, the flue gas flows along the first air deflector 413 towards the flanging structure 4131, and finally rises to the top of the housing 41 around the flanging structure 4131 and is output from the flue gas outlet 412.

In another embodiment, the first air deflector 413 is provided with a plurality of first air vents 4132, and the first air vents 4132 are far away from the fixed end of the first air deflector 413.

Specifically, in order to reduce wind resistance more effectively and ensure smooth output of the flue gas, a plurality of first ventilation holes 4132 are further formed in the first air deflector 413, in the use process, part of the flue gas can pass through the first ventilation holes 4132 and can be discharged, and the rest of the flue gas bypasses the bottom of the flanging structure 4131 and flows to the flue gas outlet 412.

In some embodiments, for the location of the distribution of the first vent holes 4132, the first vent holes 4132 may be formed on the flange structures 4131; and/or, a first vent 4132 is formed at the free end of the first air deflector 413.

In another embodiment of the present application, a second air deflector 414 is disposed in the housing 41, the second air deflector 414 is covered above the flue gas inlet 411 and is located at the lower part of the first air deflector 413, a plurality of second air ventilation holes 4141 are disposed on the second air deflector 414, and the second heat exchange tube 42 is located between the second air deflector 414 and the flanging structure 4131.

Specifically, in order to effectively disperse the flue gas entering the housing 41 to be more uniformly dispersed to each position of the second heat exchange tube 42, a second air deflector 414 is additionally disposed in the housing 41, and the second air deflector 414 covers the flue gas inlet 411, so that after the flue gas enters through the flue gas inlet 411, the flue gas is outputted from the second ventilation hole 4141 and flows transversely to the second heat exchange tube 42 at one side, and further, in the height direction, the flue gas flow is uniformly distributed to the second heat exchange tube 42, so that the heat exchange uniformity of the second heat exchange tube 42 is more effectively improved.

In one embodiment, the second air deflector 414 has an inverted U-shaped structure, and the second air deflector 414 is provided with second ventilation holes 4141 adjacent to the side of the second heat exchange tube 42.

Specifically, the second air deflector 414 with the inverted U-shaped structure can effectively cover the upper portion of the flue gas inlet 411, the second air deflector 414 forms a buffer zone for flue gas entering the shell 41, and the second air vent 4141 formed at one side of the second air deflector 414 is adjacent to the second heat exchange tube 42, so that the output flue gas can be ensured to directly enter the area where the second heat exchange tube 42 is located, and the heat exchange efficiency is improved.

In one embodiment, the flue gas inlet 411 is located below the fixed end of the first air deflector 413, and the second air deflector 414 covers the flue gas inlet 411.

Specifically, the flue gas output from the second ventilation holes 4141 will be conveyed towards the flanging structure 4131, and in the conveying process, the flue gas rises and flows onto the first air deflector 413, and the flue gas is guided by the first air deflector 413 which is obliquely arranged, so that the flue gas is ensured to uniformly exchange heat with the second heat exchange tube 42, and smooth flow of the flue gas in the shell 41 can be ensured, so that the influence of wind resistance is reduced, and smooth smoke discharge is ensured.

In an embodiment of the present application, the air collecting hood 43 is further included, a communication port 431 is provided at the top of the air collecting hood 43, the air collecting hood 43 is disposed at the bottom of the housing 41, and the communication port 431 is communicated with the flue gas inlet 411.

Specifically, in order to better collect the flue gas generated by the combustion chamber in the gas water heater, a gas collecting cover 43 is configured at the bottom of the casing 41, and the gas collecting cover 43 can better cooperate with the top of the combustion chamber to collect the flue gas and guide the flue gas into the casing 41.

In another embodiment of the present application, in order to ensure that condensed water can be smoothly discharged. For the housing 41, the bottom plate of the housing 41 is arranged obliquely, the flue gas inlet and the drain connector 415 are arranged on the bottom plate of the housing 41, the flue gas inlet is positioned at a high side position of the bottom plate of the housing 41, and the drain connector 415 is positioned at a low side position of the bottom plate of the housing 41.

Specifically, the bottom plate of the housing 41 is disposed in an inclined manner, the inclined surface formed on the upper surface of the bottom plate can guide the condensed water dropped from the second heat exchange tube 42 to flow to the bottom region of the housing 41, and the drain connector 415 is disposed at a low side position of the bottom plate, so that the condensed water can be smoothly discharged out of the housing 41 through the drain connector 415, thereby reducing the occurrence of a situation that the condensed water in the housing 41 cannot be smoothly discharged for a long time.

In another embodiment, in order to further improve the smoothness of the flow of the flue gas, the top surface of the gas collecting hood 43 is disposed obliquely, and the communication port 431 is disposed at a high side position of the top surface of the gas collecting hood 43.

Specifically, a gas-collecting hood 43 covers the top of the combustion chamber 2 to collect and guide the flue gas into the housing 41. The top of the gas-collecting hood 43 is designed to be an inclined surface, and the flue gas can flow to the communication port 431 along the direction of the inclined surface, so that the flue gas enters the housing 41 through the communication port 431.

Wherein, the bottom plate of the casing 41 and the top surface of the gas collecting channel 43 have the same inclined extending direction, for example: the bottom plate of the case 41 and the top surface of the gas-collecting hood 43 extend obliquely upward in the front-to-back plate direction of the housing 1.

In a further embodiment of the present application, for facilitating the later disassembly and maintenance, a first mounting frame 21 is provided on the back of the combustion chamber 2, and a first flange 22 is provided on the top edge of the combustion chamber 2; the edge of the gas-collecting hood 43 is provided with a second flanging 432, and the gas-collecting hood 43 is also provided with a second mounting rack 433; the first flange 22 and the second flange 432 are connected together, and the first mounting frame 21 and the second mounting frame 433 are fixed on the back plate of the housing 1.

Specifically, during assembly, the combustion chamber 2 is fixedly mounted on the back plate of the housing 1 through the first mounting frame 21, the condensing heat exchanger 4 is fixedly mounted on the housing 1 through the second mounting frame 433 on the gas collecting hood 43, and then the gas collecting hood 43 is connected with the combustion chamber 2 through the first flange 22 and the second flange 432 to meet the requirement of flue gas sealing.

In the later use process, when the second heat exchanger in the condensing heat exchanger 4 is damaged and needs to be replaced, only the first flange 22 and the second flange 432 need to be detached, then the second mounting rack 433 is detached from the back plate of the shell 1, and the second heat exchange tube 42, the water inlet tube 11 and the first heat exchange tube 31 are detached, so that the condensing heat exchanger 4 can be independently detached for maintenance or replacement.

The independent mounting frames are respectively arranged on the combustion chamber 2 and the condensing heat exchanger 4 for mounting so as to meet the requirement of independent disassembly, and meanwhile, the combustion chamber 2 and the condensing heat exchanger 4 are further connected through two flanges so as to meet the sealing requirement of flue gas, so that the condensing heat exchanger 4 can be independently disassembled according to the maintenance requirement while the flue gas transportation is met, and the later maintenance is facilitated; and moreover, the installation rack is independently provided with the combustion chamber 2 and the condensing heat exchanger 4, so that the fixed installation function can be better realized, and the use reliability of the gas water heater is improved.

In one embodiment, the first flanges 22 are distributed around the combustion chamber 2 and extend towards the outside of the combustion chamber 2, and the second flanges 432 are distributed around the gas-collecting hood 43 and extend towards the outside of the gas-collecting hood 43.

Specifically, the first flange 22 and the second flange 432 both bend and extend toward the outer side, so that an operator can fix or detach the screw by the screw more conveniently during assembly and disassembly.

In another embodiment, a third mounting bracket 416 is provided on the back of the housing 41, and the third mounting bracket 416 is also fixed on the back plate of the casing 1.

Specifically, for the condensing heat exchanger 4, in order to further improve the connection reliability, a third mounting frame 416 may be additionally disposed on the housing 41, and the third mounting frame 416 is also fixed on the back plate of the housing 1, so that the second mounting frame 433 and the third mounting frame 416 cooperate with each other to improve the connection reliability between the condensing heat exchanger 4 and the housing 1.

In some embodiments, a first connecting frame 416 is further disposed at the bottom of the housing 41, and a second connecting frame 434 is disposed on the gas collecting hood 43, where the first connecting frame 416 and the second connecting frame 434 are connected together.

Specifically, for the case 41 and the gas collecting hood 43, both are connected and fixed by two connection frames, and the connection frames can be set as needed, for example: the housing 41 has first connection frames 416 disposed in front and rear thereof, and the gas collecting hood 43 has second connection frames 434 disposed in front and rear thereof, respectively.

In some embodiments, the back plate of the housing 1 is provided with a heat dissipation hole 15, and the first mounting frame 21 is formed with a recess structure 23, where the recess structure 23 is disposed opposite to the heat dissipation hole 15.

Specifically, after the first mounting frame 21 is fixed on the back plate of the housing 1, the concave structure 23 and the heat dissipation holes 15 are arranged oppositely to form a ventilation area, and the back space of the housing 1 is fully utilized to place the first mounting frame 21, and simultaneously, the ventilation and heat dissipation requirements are met.

Compared with the prior art, the invention has the advantages and positive effects that: the first air deflector is arranged in the shell 41 to shield the lower part of the smoke outlet, the flanging structure is further arranged on the first air deflector, in the use process, the smoke enters the shell 41 through the smoke inlet and then contacts with the second heat exchange tube 42 below the first air deflector, the smoke cannot continuously rise and is further limited by the flanging structure due to the limitation of the first air deflector in the rising process, the smoke has a downward flowing trend in the shell 41, and therefore the smoke can exchange heat with the second heat exchange tube 42 below the first air deflector sufficiently, so that the heat exchange efficiency of the condensing heat exchanger 4 is improved to reduce the energy consumption of the gas water heater.

In the second embodiment, as shown in fig. 10 to 12, in order to avoid that condensed water generated by the condensing heat exchanger 4 is frozen in winter environment and the condensed water cannot be discharged normally after the equipment is started, the gas water heater further comprises a heating assembly 5, wherein the heating assembly 5 comprises a temporary storage tank 51 and an electric heating component 52, an overflow plate 53 is arranged in the temporary storage tank 51, and the overflow plate 53 separates an inner cavity of the temporary storage tank 51 into a first water cavity 511 and a second water cavity 512; a first connecting pipe 54 is arranged on the top of the temporary storage box 51, a second connecting pipe 55 is arranged on the bottom of the temporary storage box 51, the lower end part of the first connecting pipe 54 extends into the first water cavity 511, the second connecting pipe 55 is communicated with the second water cavity 512, and the electric heating component 52 is arranged on the temporary storage box 51;

wherein the combustion chamber 2 is arranged in the shell 1, the first heat exchange tube 31 is arranged on the combustion chamber 2 and above the burner, and the shell 41 covers the top of the combustion chamber 2; the water inlet pipe 11, the second heat exchange pipe 42, the first heat exchange pipe 31 and the water outlet pipe 12 are sequentially communicated, the water discharge joint 415 is communicated with the water discharge pipe 14, the water discharge joint 415 is communicated with the first connecting pipe 54, and the second connecting pipe 55 extends out of the shell 1.

Specifically, for the condensed water discharged from the condensing heat exchanger 4 to flow into the temporary storage tank 51 via the first connecting pipe 54, the overflow plate 53 provided in the temporary storage tank 51 forms the first water chamber 511 and the second water chamber 512 in the temporary storage tank 51, and the condensed water flowing out of the first connecting pipe 54 is accumulated in the first water chamber 511.

Since the lower end of the first connection pipe 54 extends into the first water chamber 511, the condensed water in the first water chamber 511 can submerge the lower pipe orifice of the first connection pipe 54 to form a water seal, thereby avoiding the leakage of the flue gas from the temporary storage box 51.

As the condensed water continuously enters the first water chamber 511, the condensed water level in the first water chamber 511 overflows into the second water chamber 512 above the overflow plate 53, and the condensed water in the second water chamber 512 can be discharged into the drain pipe 14 through the second connection pipe 55, and finally discharged through the drain pipe 14.

Since a certain amount of condensed water is always stored in the first water chamber 511, it is easy to freeze in winter. Therefore, the temporary storage box 51 is additionally provided with the electric heating component 52, and the electric heating component 52 can heat the first water cavity 511 after being electrified to melt the frozen condensed water in the interior, so that the lower pipe orifice of the first connecting pipe 54 can be ensured to smoothly discharge the condensed water, thereby avoiding equipment faults caused by the fact that the condensed water is accumulated in the condensed water heat exchanger and further improving the use reliability of the gas water heater.

In some embodiments, a drain pipe 56 is further disposed at the bottom of the temporary storage box 51, the drain pipe 56 is communicated with the first water cavity 511, and a nozzle of the drain pipe 56 is provided with a detachable plug 57.

Specifically, after the flue gas enters the condensed water heat exchanger, the flue gas will generate dirt such as smoke dust on the outer surface of the second heat exchange tube 42, and the condensed water formed by the second heat exchange tube 42 will flow into the first water chamber 511 with the dirt such as smoke dust. After long-term use, dirt will form at the bottom of the first water chamber 511, and dirt in the first water chamber 511 can be cleaned and discharged periodically by providing the drain pipe 56, so as to avoid the lower pipe orifice of the first connecting pipe 54 from being blocked due to excessive accumulation of dirt.

In one embodiment, for the electric heating element 52, the performance entity may be an electric heating tube or an electric heating element such as a thick film. For the electric heating tube, it may be wound outside the temporary storage box 51; for thick films, it surrounds the outside of the temporary storage box 51.

In a third embodiment, another embodiment of the present application further provides a gas water heater, which has a function of zero cold water, for which, the casing 1 is further provided with a zero cold water pipe 13; the gas water heater is also provided with a circulating pump 16, an inlet of the circulating pump 16 is respectively communicated with the zero-cooling water pipe 13 and the water inlet pipe 11, and an outlet of the circulating pump 16 is communicated with the second heat exchange pipe 42.

Specifically, the shell 1 of the gas water heater is provided with the zero-cooling water pipe 13, and the zero-cooling water pipe 13 can circularly convey water in the water pipe of the user's home into the condensing heat exchanger 4 and the heat exchanger 3 through the circulating pump 16 so as to heat the water in the water pipe of the user's home and further achieve the function of zero-cooling water.

In another embodiment of the present application, the user has a case of suspending water for a short time during the water using process and then using water again during the use of the gas water heater. In this process, the water in the first heat exchange tube 31 is continuously heated in the water closing process due to the higher temperature in the combustion chamber 2, and the temperature is greatly fluctuated when the user uses water again, namely, the problem of secondary water temperature rise exists. To reduce the fluctuation of temperature, to improve the user experience.

As shown in fig. 13, the gas water heater further includes a bypass pipe 17, a pipe orifice of the bypass pipe 17 is connected with the water outlet pipe 12 and the first heat exchange pipe 31 through a tee, another pipe orifice of the bypass pipe 17 is connected with the water outlet pipe 12 and the first heat exchange pipe 31 through a tee, and a first electric control valve is disposed on the bypass pipe 17.

Specifically, during the use, when the user uses hot water, cold water conveyed by the tap water pipe enters the second heat exchange pipe 42 through the water inlet pipe 11 and enters the first heat exchange pipe 31 through the circulating pump 16; the water entering the first heat exchange tube 31 exchanges heat with the high-temperature flue gas generated by the combustion of the burner to form hot water, and the hot water flows into the first electric control valve through the water outlet tube 12, and finally, the hot water flows into a water use terminal, such as a faucet or a shower head, from the water outlet tube 12.

In the zero-cooling water mode, the circulation pump 16 starts the first electric control valve to be inactive, the first heat exchange tube 31 is not communicated with the bypass tube 17, and the user terminal is not started, so that the water in the external pipeline enters the second heat exchange tube 42 through the zero-cooling water tube 13 under the action of the circulation pump 16, and then enters the heat exchanger 3 to heat and recycle the flow to the external pipeline, so that the function of zero-cooling water is achieved.

In the using process, the user can start water again after closing water for a short time, namely, secondary boiled water. Before the user generates the secondary boiled water, a certain amount of hot water is stored in the first heat exchange tube 31 and the residual heat of the first heat exchange tube 31 can continuously heat the water, so as to fully utilize the residual heat of the first heat exchange tube 31 to heat the water and solve the technical problem that the temperature of the discharged water fluctuates due to the secondary boiled water.

After the user turns off water in a short time, the first electric control valve acts to enable the first heat exchange tube 31 to be communicated with the bypass tube 17, and further enable the first heat exchange tube 31, the bypass tube 17, the second heat exchange tube 42 and the circulating pump 16 to be sequentially communicated to form a closed-loop water circulation flow path, namely, internal circulation is formed inside the device.

After the first electric control valve communicates the first heat exchange tube 31 with the bypass tube 17, the circulation pump 16 is started, water in the second heat exchange tube 42 is input into the first heat exchange tube 31 under the action of the circulation pump 16, meanwhile, the water in the first heat exchange tube 31 is circulated back into the second heat exchange tube 42, and the water in the second heat exchange tube 42 is circularly heated by the first heat exchange tube 31.

Thus, when the user uses the boiled water for the second time, the first electric control valve cuts off the flow path between the first heat exchange pipe 31 and the bypass pipe 17. The burner delays ignition, and at the same time, hot water in the second heat exchange tube 42 flows into the first heat exchange tube 31 under the action of cold water introduced from the water inlet tube 11, so that the relatively stable output of hot water from the water outlet tube 12 is realized, and the fluctuation range of the temperature of the water outlet is reduced.

In addition, after the water is turned off in the use process, the water in the second heat exchange tube 42 can perform internal circulation, so that a certain amount of hot water exists in the second heat exchange tube 42, so that the waste heat of the first heat exchange tube 31 and the combustion chamber 2 is fully utilized, and then in the zero cold water executing mode, the water in the external pipeline can enter the second heat exchange tube 42, so that the hot water in the second heat exchange tube 42 participates in the zero cold water flow path, the starting time of the burner in the zero cold water mode is shortened, and the energy consumption is reduced.

The second heat exchange tube 42 is arranged at the inlet of the water pump, the second heat exchange tube 42 is connected with the water inlet pipe 11 on one hand, and on the other hand, the second heat exchange tube 42 is also connected with the first electric control valve through the bypass pipe 17, in the use process, when a user turns on the gas water heater, under the condition of short water cut-off, the first heat exchange tube 31 is controlled to be communicated with the bypass pipe 17 through the first electric control valve, the water pump is started so that water in the gas water heater circularly flows between the heat exchanger 3 and the second heat exchange tube 42, the waste heat of the heat exchanger 3 is utilized to heat the water in the second heat exchange tube 42, and then the user delays the ignition process when using the secondary water, the hot water in the second heat exchange tube 42 enters the heat exchanger 3, so that the water outlet pipe 12 can output relatively constant-temperature hot water, the fluctuation range of the secondary boiled water temperature is lightened, and the user experience is improved.

In another embodiment of the present application, a check valve is provided between the first electrically controlled valve and the bypass pipe 17, the check valve being configured to restrict the unidirectional flow of water in the bypass pipe 17 to the second heat exchange pipe 42.

Specifically, in the process that the gas water heater is in the self-circulation before the secondary boiled water, since the water inlet pipe 11 and the bypass pipe 17 are also communicated with each other through the four-way pipe, in order to avoid that cold water reversely flows through the bypass pipe 17 due to the water pressure effect of the water supply pipe when the circulating pump 16 is not started, a one-way valve can be arranged between the first electric control valve and the bypass pipe 17, and the one-way valve can limit the water flow direction of the bypass pipe 17, so that water in the bypass pipe 17 cannot reversely flow. Further, it is ensured that after the circulation pump 16 is started, the water in the first heat exchange tube 31 flows into the second heat exchange tube 42 through the bypass tube 17.

In another embodiment, in order to introduce cold water through the zero cold water pipe 13 as required in the internal circulation process, a second electric control valve may be disposed between the water inlet pipe 11 and the four-way pipe, and a third electric control valve may be disposed between the zero cold water pipe 13 and the four-way pipe.

Specifically, in the process of internal circulation of the secondary water, the water inlet pipe 11 can be closed through the second electric control valve, the zero-cooling water pipe 13 can be opened through the third electric control valve, after the circulating pump 16 is started, the water in the first heat exchange pipe 31 is output from the water outlet pipe 12 through the first heat exchange pipe 31, and the zero-cooling water pipe 13 introduces cold water into the second heat exchange pipe 42 and conveys the cold water into the first heat exchange pipe 31.

The application also provides a control method of the gas water heater, which aims at improving the control method of the gas water heater in the use process of the gas water heater in a zero cold water mode, and is specifically described as follows.

Specifically, after the zero cold water gas water heater is electrified and started, the zero cold water mode is executed first, and in the zero cold water mode, the circulating pump and the burner are started, so that water in the external pipeline circularly flows into the first heat exchange tube to be heated. The specific control method for the zero cold water mode may refer to the control process of the gas water heater in the conventional technology to execute the zero cold water mode, which is not limited herein.

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 the process, the water temperature at the water inlet pipe is low, and the conventional technology executes the zero-cooling water mode again, however, the water temperature in the water outlet pipe and the water terminal pipeline of the user is still high, and the energy consumption is increased when the zero-cooling water mode is started frequently.

Therefore, when the user temporarily stops water in the process of using hot water, an internal circulation mode can be executed, namely, a bypass pipe is opened and a circulation pump is started, so that water between the first heat exchange pipe and the second heat exchange pipe circularly flows, cold water in the second heat exchange pipe is utilized to circularly flow into the first heat exchange pipe to absorb the waste heat of the first heat exchange pipe, and further, the phenomenon that the temperature fluctuation of water outlet is overlarge due to the temperature rising of the waste heat of the first heat exchange pipe is avoided.

Meanwhile, after the user starts again, the combustor can be started for a certain time, and hot water in the second heat exchange tube can flow into the first heat exchange tube and finally be output, so that the problem that the temperature fluctuation of the water outlet is overlarge because cold water enters the first heat exchange tube and is not heated and is output from the water outlet tube in the conventional technology is avoided.

After the zero cold water mode is executed, in the normal water using process of a user, after the user pauses water, the bypass pipe is opened and the circulating pump is controlled to operate so that water in the zero cold water heater flows in an internal circulation mode, so that the frequent starting of the zero cold water mode due to the fact that the water temperature of the water inlet pipe is too low is reduced, the starting frequency of the zero cold water mode can be reduced, on one hand, the energy consumption can be reduced, on the other hand, noise generated by starting the burner by executing the zero cold water mode can be reduced, and the user experience is improved.

In some embodiments, to avoid frequent start of the internal circulation during use, 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.

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 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 at the outlet of the second heat exchange tube does not reach the second set temperature value T2, starting the burner until the water temperature at the outlet of the second heat exchange tube reaches the third set temperature value T3, and then stopping the burner and continuously operating the circulating pump until the water temperature at the outlet of the second heat exchange tube reaches the second set temperature value T2; wherein T2> T3.

Specifically, when the zero cold water gas water heater is in the internal circulation mode, the operation time of the circulating pump and the water outlet temperature of the second heat exchange tube are judged to trigger the end of the internal circulation mode, namely, after the operation of the circulating pump exceeds the second set time T2 and the water temperature at the outlet of the second heat exchange tube exceeds the second set temperature value T2, the internal circulation mode is ended, and the circulating pump stops operating. Thus, the water inside the zero-cooling water gas water heater can be ensured to be fully and circularly mixed uniformly.

In addition, in the process of executing the internal circulation mode, when the water temperature at the outlet of the second heat exchange tube does not reach the second set temperature value T2 due to the fact that the heat absorbed by the water temperature of the second heat exchange tube is large, the burner is started to assist in heating the first heat exchange tube, after the burner is started, the burner is stopped after the water temperature at the outlet of the second heat exchange tube is detected to exceed the third set temperature value T3, the circulating pump continues to operate to absorb the waste heat of the first heat exchange tube, so that the water temperature at the outlet of the second heat exchange tube continuously rises until the water temperature exceeds the second set temperature value T2, and then the circulating pump is stopped.

In other embodiments, in the normal water use process after the execution of the zero-cold water mode is finished, after the water consumption is suspended for more than the third set time t3, if the water temperature at the outlet of the second heat exchange tube is lower than the set starting water temperature value Ts, the zero-cold water mode is executed again;

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

Specifically, after the user turns off the water, no matter whether 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 and the water consumption 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 continues to operate until the water temperature at the outlet of the second heat exchange tube reaches the second set temperature value T2, specifically:

in the continuous operation process of the closed burner circulating pump, if the water temperature of the outlet of the first heat exchange tube is higher than a fourth set temperature value T4 and the water temperature of the outlet of the second heat exchange tube is higher than T2, the bypass tube is closed and a flow path between the zero cold water tube and the circulating pump is opened, after the circulating pump is started to operate for a period of time longer than a fourth time T4, the bypass tube is opened and the flow path between the zero cold water tube and the circulating pump is closed, and the circulating pump continuously operates until the water temperature of the outlet of the first heat exchange tube is lower than T5 and the water temperature of the outlet of the second heat exchange tube 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 excessive heat generated by the burner, so that the overall water temperature in the internal circulation mode is too high, and at this time, a certain amount of cold water can be introduced through the zero-cold water pipe to further reduce the internal water temperature. That is, if the water temperature at the outlet of the first heat exchange tube is higher than the fourth set temperature value T4 and the water temperature at the outlet of the second heat exchange tube is higher than T2, the water temperature caused by excessive waste heat generated by the first heat exchange tube is too high due to heating of the burner, at this time, the bypass tube can be closed and the flow path between the zero cold water tube and the circulating pump can be opened, a certain amount of cold water is introduced through the zero cold water tube under the action of the circulating pump, so that the overall water temperature of the internal circulating water is reduced, the fluctuation of the water outlet temperature when the user uses water again is finally reduced, and the user experience is improved.

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 gas water heater, comprising:

2. The gas water heater of claim 1, wherein the first air deflector is provided with a plurality of first vent holes, the first vent holes being remote from a fixed end of the first air deflector.

3. The gas water heater according to claim 1, wherein a second air deflector is arranged in the shell, the second air deflector is covered above the flue gas inlet and is positioned at the lower part of the first air deflector, a plurality of second ventilation holes are formed in the second air deflector, and the second heat exchange tube is positioned between the second air deflector and the flanging structure.

4. The gas water heater according to claim 1, further comprising a gas collecting hood, wherein a communication port is arranged at the top of the gas collecting hood, the gas collecting hood is arranged at the bottom of the shell, and the communication port is communicated with the flue gas inlet; the gas-collecting channel covers the top of the combustion chamber.

5. The gas water heater of claim 4, wherein the floor of the housing is disposed at an incline, the flue gas inlet and the drain fitting are disposed on the floor of the housing, the flue gas inlet is located at a high side of the floor of the housing, and the drain fitting is located at a low side of the floor of the housing.

6. The gas water heater according to claim 5, wherein the top surface of the gas collecting channel is disposed obliquely, and the communication port is disposed at a high side position of the top surface of the gas collecting channel.

7. The gas water heater as recited in any one of claims 1-6, wherein a zero cold water pipe is further provided on the housing; the gas water heater is also provided with a circulating pump, an inlet of the circulating pump is respectively communicated with the zero-cooling water pipe and the water inlet pipe, and an outlet of the circulating pump is communicated with the second heat exchange pipe.

8. The gas water heater of claim 7, further comprising a bypass pipe, wherein one pipe orifice of the bypass pipe is connected with the water outlet pipe and the first heat exchange pipe through a three-way pipe, and the other pipe orifice of the bypass pipe is connected with the water outlet pipe and the first heat exchange pipe through a four-way pipe, and an electric control valve is arranged on the bypass pipe.

9. A control method of a gas water heater as claimed in claim 8, comprising:

10. The control method of a gas water heater according to claim 9, further comprising: