WO2021063049A1

WO2021063049A1 - Gas water heater

Info

Publication number: WO2021063049A1
Application number: PCT/CN2020/098668
Authority: WO
Inventors: 胡勇; 林钦; 高砚庄; 刘小平; 王志昂; 林玉绵
Original assignee: 珠海格力电器股份有限公司
Priority date: 2019-09-30
Filing date: 2020-06-29
Publication date: 2021-04-08
Also published as: CN110542202A

Abstract

The present disclosure discloses a gas water heater, wherein, including a gas mixing device, a combustion chamber, a heat exchange chamber and a condensate collector sequentially communicated; the inlet end of the gas mixing device is respectively communicated with an air supply device and a gas supply device, the combustible gas and combustion air form the mixed gas in the gas mixing device; a catalytic combustor is provided in the combustion chamber, the mixed gas is oxidized and combusted in the catalytic combustor to produce high-temperature flue gas; a heat exchanger is provided in the heat exchange chamber, the high-temperature flue gas heats the water in the heat exchanger to produce hot water; the outlet end of the condensate collector is communicated with a smoke exhaust device, the low-temperature flue gas is discharged from the smoke exhaust device, and the produced condensate water falls in the condensate collector. The gas water heater of the present disclosure catalytically oxidizes the gas, through the action of the catalytic combustor, the gas can be effectively and fully combusted, the temperature during combustion is reduced, and ultimately the formation of nitrogen oxides and carbon monoxide is inhibited.

Description

Gas water heater

This disclosure claims the priority of a Chinese patent application filed with the Chinese Patent Office with an application number of 201910939624.2 and an invention title of "gas water heater" on September 30, 2019, the entire content of which is incorporated into this disclosure by reference.

Technical field

The present disclosure relates to the field of household appliances, and in particular to a gas water heater.

Background technique

Gas water heater, also known as gas water heater, refers to a gas appliance that uses gas as fuel to transfer heat to the cold water flowing through the heat exchanger through combustion heating to achieve the purpose of preparing hot water. At present, energy conservation and emission reduction are the development direction advocated by the state, and products with less energy consumption will be a direction for future development.

The combustion technology of existing gas water heaters is basically divided into atmospheric combustion and full premixed combustion. Among them, these two combustion methods are flame combustion, and the high combustion temperature of gas will produce harmful substances such as nitrogen oxides. These harmful substances Substances not only cause harm to the human body, but also cause serious pollution to the atmosphere. At the same time, due to insufficient combustion, it will cause the production of carbon monoxide and reduce the energy efficiency.

Summary of the invention

The purpose of the present disclosure is to provide a gas water heater that can well solve the problems of insufficient combustion and high combustion temperature.

In order to achieve the above purpose, the specific technical solution of the gas water heater of the present disclosure is:

A gas water heater, which includes a gas mixing device, a combustion chamber, a heat exchange chamber, and a condensate collector that are sequentially connected; the air inlet end of the gas mixing device is respectively connected with the air supply device and the gas supply device, which is combustible The gas and combustion-supporting air form a mixed gas in the gas mixing device; a catalytic burner is installed in the combustion chamber, and the mixed gas is oxidized and burned in the catalytic burner to produce high-temperature flue gas; the heat exchange chamber is provided with heat Exchanger, the high temperature flue gas heats the water in the heat exchanger to produce hot water; the outlet end of the condensate collector is connected with the smoke exhaust device, the low temperature flue gas is discharged by the smoke exhaust device, and the condensate produced falls on the condensation In the water collector.

In some embodiments, the gas mixing device, the combustion chamber, the heat exchange chamber, and the condensate collector are arranged sequentially from top to bottom.

In some embodiments, the gas mixing device includes a constriction, a mixing section, a diffuser, and a splitter that are sequentially connected. The constriction is in communication with the air supply device and the air supply device, and the combustible gas and the combustion air are mixed in the mixing section. , The pressure of the mixed gas changes in the diffuser part, and the branch part communicates with the combustion chamber.

In some embodiments, the constriction of the gas mixing device is a venturi tube structure.

In some embodiments, the mixing part of the gas mixing device is provided with a turbulence component, and the turbulence component can change the flow path of the mixed gas to improve the mixing effect of combustible gas and combustion air.

In some embodiments, the spoiler component is a spiral guide groove.

In some embodiments, the diffuser opening angle of the diffuser portion of the gas mixing device is 6°-8°.

In some embodiments, a flow dividing plate is provided in the flow dividing part of the gas mixing device, and a plurality of gas through holes are provided on the flow dividing plate.

In some embodiments, the catalytic combustor includes a combustor body and a combustion catalyst. The combustor body is provided with a plurality of combustion holes, and the combustion catalyst is provided on the combustor body.

In some embodiments, the burner body is made of SiO ₂ or AL ₂ O ₃ material.

In some embodiments, the diameter of the combustion hole on the burner body is 1.2-1.5 mm or 1.1-1.2 mm.

In some embodiments, the combustion hole on the burner body is circular or polygonal.

In some embodiments, the combustion catalyst is Pd, Pt, CuO, MnO ₂ .

The gas water heater of the present disclosure has the following advantages:

1) Catalytic oxidation of fuel gas, through the action of a catalytic burner, can effectively and fully burn fuel gas, reduce the temperature during combustion, and ultimately inhibit the formation of nitrogen oxides and carbon monoxide;

2) The fuel gas is effectively and fully combusted, which improves the energy conversion efficiency.

Description of the drawings

Figure 1 is a schematic diagram of the internal structure of the gas water heater of the present disclosure;

2 is a schematic structural diagram of the first embodiment of the gas mixing device in the gas water heater of the present disclosure;

3 is a schematic structural diagram of a second embodiment of the gas mixing device in the gas water heater of the present disclosure;

Fig. 4 is a schematic structural diagram of a first embodiment of a catalytic combustor in a gas water heater of the present disclosure;

Fig. 5 is a schematic structural diagram of a second embodiment of the catalytic combustor in the gas water heater of the present disclosure.

Detailed ways

In order to better understand the purpose, structure and function of the present disclosure, a gas water heater of the present disclosure will be described in further detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 5, the gas water heater of the present disclosure includes a gas mixing device 10, a combustion chamber, a heat exchange chamber, and a condensate collector 40 that are connected in sequence from top to bottom. The inlet end of the gas mixing device 10 is respectively connected with the air supply device 50 and the air supply device, and the combustible gas and the combustion-supporting air form a mixed gas in the gas mixing device 10.

In some embodiments, a catalytic combustor 20 is provided in the combustion chamber, and the mixed gas is oxidized and combusted in the catalytic combustor 20 to generate high-temperature flue gas; the heat exchange chamber is provided with a heat exchanger 30, The flue gas heats the water in the heat exchanger 30 to produce hot water; the outlet end of the condensate collector 40 is connected to the fume exhaust device 60, and the low-temperature flue gas is discharged from the fume exhaust device 60, and the condensate produced falls on the condensate The water collector 40.

Therefore, the gas water heater of the present disclosure adopts inverted full premixed catalytic combustion, and the heat exchange direction of high-temperature flue gas is transferred from top to bottom. Most of the flue gas is condensed in the heat exchange chamber, and the condensed water produced can be Directly into the condensate collector.

Specifically, as shown in Figures 1 to 3, in this embodiment, the gas mixing device 10 includes a constriction 11, a mixing section 12, a diffuser 13 and a shunting section 14, which are connected in sequence, wherein the constriction 11 and The air supply device 50 and the air supply device are connected, the combustible gas and the combustion-supporting air are mixed in the mixing part 12, the pressure of the mixed gas is changed in the diffuser part 13, and the branching part 14 is connected to the combustion chamber.

In some embodiments, the constriction 11 of the gas mixing device 10 adopts a venturi structure, which is respectively connected with the air supply device 50 and the air supply device. The combustion-supporting air is sent into the gas mixing device 10 by the air supply device 50, and the combustible gas The gas mixing device 10 is fed into the gas mixing device 10 by the gas supply device, and the gas mixing device 10 of the venturi tube structure allows the combustible gas to enter more smoothly. Preferably, a gas proportional valve 70 is provided between the gas mixing device 10 and the gas supply device to adjust the amount of intake air as required. Of course, it is understandable that the constriction of the gas mixing device in the present disclosure can also adopt other forms of air intake structure, and it is not limited to what is shown in the figure, as long as it can realize the smooth entry of combustion air and combustible gas.

In some embodiments, the mixing section 12 of the gas mixing device 10 is a position where the combustion-supporting air and combustible gas are mixed. The common mixing section 12 is shown in FIG. 2. The combustion-supporting air and combustible gas are only in the mixing section 12. Natural mixing during the flow; Figure 3 shows a special type of mixing part 12, the mixing part 12 is provided with a turbulence assembly 15, the turbulence assembly 15 can change the flow path of the mixed gas to improve the combustible gas and combustion-supporting For the air mixing effect, it is preferable that the spoiler assembly 15 is a spiral guide groove. Of course, it is understandable that the mixing part of the gas mixing device in the present disclosure can also adopt other forms of mixing structure, and it is not limited to what is shown in the figure, as long as it can achieve uniform mixing of combustion air and combustible gas.

In some embodiments, the diffuser 13 of the gas mixing device 10 changes the mixed gas from dynamic pressure to static pressure to increase the pressure of the mixed gas. At the same time, it can also further mix the combustion air and the combustible gas evenly. Among them, it is preferable that, as shown in FIGS. 2 and 3, the expansion angle α of the diffuser portion 13 (the angle between the extending direction of the opening of the diffuser portion 13 and the extending direction of the side wall of the diffuser portion 13) Generally, it is 6°～8°, and the resistance loss is the least at this time. Of course, it is understandable that the expansion angle of the expansion section in the present disclosure can be flexibly adjusted according to actual conditions, and is not limited to what is shown in the figure.

In some embodiments, the flow divider 14 of the gas mixing device 10 is provided with a flow divider plate, which can be made of metal or other high temperature resistant materials, and a plurality of gas through holes are provided on the flow divider plate to stabilize the gas flow and divide the flow. effect. Thus, the gas mixing device 10 in the present disclosure can achieve uniform and sufficient mixing of combustion-supporting air and combustible gas, and deliver the mixed gas to the combustion chamber for combustion.

In some embodiments, as shown in FIGS. 1, 4, and 5, the catalytic combustor 20 in the combustion chamber includes a combustor body 21 and a combustion catalyst, wherein the combustor body 21 is made of high temperature resistant materials, Preferably, silica gel (SiO ₂ ) and aluminum gel (AL ₂ O ₃ ) are used, and a plurality of combustion holes 22 are provided on the burner body 21. According to actual conditions, the diameter of the combustion holes 22 on the burner body 21 can be 1.2~ 1.5mm (for natural gas) or 1.1～1.2mm (for liquefied petroleum gas). In addition, as shown in FIGS. 4 and 5, the shape of the combustion hole 22 on the burner body 21 can also be flexibly selected according to the actual situation, such as a circle or a polygon.

In some embodiments, the combustion catalyst is arranged on the burner body 21 to oxidize the mixed gas (combustion air and combustible gas) and reduce the flash point of the mixed gas (combustion air and combustible gas). Preferably, the combustion catalyst is made of Pd, Pt, CuO, MnO ₂ and other materials, which are attached to the surface of the burner body 21, such as the upper surface, the lower surface, and the inner surface of the combustion hole 22. The contact surface of the combustion catalyst and the mixed gas is more The larger, the better the catalytic effect. Of course, it is understandable that the combustion catalyst in the present disclosure may also use other catalytic materials, and is not limited to the above materials.

The combustion catalyst on the catalytic combustor in the present disclosure can pre-oxidize the mixed gas (combustion-supporting air and combustible gas), and the oxidized mixed gas (combustion-supporting air and combustible gas) burns on the surface of the combustion hole of the catalytic combustor, and the combustion product It is carbon dioxide and water vapor, because the combustion temperature is low and the combustion time is short, so there is basically no nitrogen oxide compound after combustion.

In some embodiments, the water inlet of the heat exchanger 30 in the heat exchange chamber is connected to the cold water pipe 31, the cold water pipe 31 is provided with a flow sensor 32, and the water outlet of the heat exchanger 30 is connected to the hot water pipe 33. The water pipe 33 is provided with a temperature sensor 34. One side of the heat exchanger 30 is opposite to the combustion chamber, and the other side is opposite to the condensate collector 40. The air outlet of the condensate collector 40 is connected with a smoke exhaust device 60. , The water outlet of the condensate collector 40 is connected with a drain pipe 80.

In some embodiments, the gas water heater of the present disclosure is also provided with an electric control device 90, which is electrically connected to the gas proportional valve 70, the air supply device 50, the temperature sensor 34, the flow sensor 32, the igniter, etc. The components are connected together to form an electric control system.

The working principle of the gas water heater of the present disclosure will be described below with reference to FIGS. 1 to 5:

The cold water flows from the flow sensor 32 into the cold water pipe 31. The flow sensor 32 receives the water flow information and sends an instruction to the electronic control device 90. The electronic control device 90 sends an instruction to start the air supply device 50. The air supply device 50 starts to provide air, and the electronic control device 90 A command is issued to start the igniter, and the igniter starts to ignite. The electronic control device 90 sends a command to start the gas proportional valve 70, and the gas proportional valve 70 opens the valve according to the specified requirements to supply natural gas.

The air and natural gas enter the gas mixing device 10 together, and are uniformly and fully mixed in the gas mixing device 10, and then form a combustible gas. The combustible gas enters the catalytic combustor 20 and reacts with the catalyst in the catalytic combustor 20. The latter combustible gas is ignited on the surface of the catalytic combustor 20. Because the combustible gas is oxidized in advance, the combustible gas has a low combustion temperature and short combustion time, so there is basically no nitrogen oxide compound after combustion.

The combusted high-temperature flue gas flows from top to bottom into the cavity of the heat exchanger 30 under the drive of the air supply device 50. The high-temperature flue gas transfers heat to the water pipe of the heat exchanger 30, and the water pipe transfers the heat to the cold water. It is heated into hot water, flows into the hot water pipe 33 from the water outlet of the heat exchanger 30, and then flows out of the machine from the hot water pipe 33 to realize the supply of hot water.

The high-temperature flue gas transfers heat to the heat exchanger 30 and becomes low-temperature flue gas. The water vapor in the low-temperature flue gas is condensed into water droplets and falls into the condensate collector 40, and is discharged out of the machine through the drain pipe 80. The low-temperature flue gas enters the smoke exhaust device 60 from the air outlet of the condensate collector 40, and is finally discharged out of the machine through the smoke exhaust device 60. Due to the implementation of inverted catalytic combustion and heat exchange methods, the collection of condensed water is more convenient and reliable.

The electronic control device 90 collects the water temperature signal fed back by the temperature sensor 34, and further adjusts the output of the gas proportional valve 70 to match the air, and finally outputs the water temperature required by the user.

The gas water heater of the present disclosure catalytically oxidizes fuel gas. Through the action of the catalytic burner, the fuel gas can be effectively and fully burned, the temperature during combustion is reduced, and the formation of nitrogen oxides and carbon monoxide is finally suppressed; at the same time, the fuel gas is effectively burned. Full combustion also improves energy conversion efficiency.

The present disclosure has been further described above with the help of specific embodiments, but it should be understood that the specific descriptions here should not be construed as limiting the essence and scope of the present disclosure. Those of ordinary skill in the art will comment on the foregoing after reading this specification. Various modifications made to the embodiments fall within the protection scope of the present disclosure.

Claims

A gas water heater includes a gas mixing device, a combustion chamber, a heat exchange chamber and a condensate collector connected in sequence; the air inlet end of the gas mixing device is respectively connected with the air supply device and the gas supply device, and the combustible gas is connected with The combustion-supporting air forms a mixed gas in the gas mixing device; a catalytic burner is installed in the combustion chamber, and the mixed gas is oxidized and burned in the catalytic burner to produce high-temperature flue gas; a heat exchanger is installed in the heat exchange chamber , The high-temperature flue gas heats the water in the heat exchanger to produce hot water; the outlet end of the condensate collector is connected with the smoke exhaust device, the low-temperature flue gas is discharged by the smoke exhaust device, and the condensate produced falls on the condensate water collection器中。 In the device.
The gas water heater according to claim 1, wherein the gas mixing device, the combustion chamber, the heat exchange chamber and the condensate collector are arranged in sequence from top to bottom.
The gas water heater according to claim 1 or 2, wherein the gas mixing device includes a contraction part, a mixing part, a diffuser part and a shunt part connected in sequence, the contraction part is connected with the air supply device and the gas supply device, and the combustible gas It is mixed with the combustion air in the mixing part, the pressure of the mixed gas changes in the diffuser part, and the branch part is connected with the combustion chamber.
The gas water heater according to claim 3, wherein the constriction of the gas mixing device is a venturi tube structure.
The gas water heater according to claim 3, wherein the mixing part of the gas mixing device is provided with a turbulence component, and the turbulence component can change the flow path of the mixed gas to improve the mixing effect of the combustible gas and the combustion air.
The gas water heater according to claim 5, wherein the spoiler component is a spiral guide groove.
The gas water heater according to claim 3, wherein the diffuser opening angle of the diffuser section of the gas mixing device is 6°-8°.
3. The gas water heater according to claim 3, wherein a distribution plate is provided in the distribution part of the gas mixing device, and a plurality of gas through holes are provided on the distribution plate.
The gas water heater according to claim 1 or 2, wherein the catalytic burner comprises a burner body and a combustion catalyst, the burner body is provided with a plurality of combustion holes, and the combustion catalyst is provided on the burner body.
The gas water heater according to claim 9, wherein the burner body is made of SiO 2 or AL 2 O 3 material.
The gas water heater according to claim 9, wherein the diameter of the combustion hole on the burner body is 1.2 to 1.5 mm or 1.1 to 1.2 mm.
The gas water heater according to claim 9, wherein the combustion hole on the burner body is circular or polygonal.
The gas water heater according to claim 9, wherein the combustion catalyst is Pd, Pt, CuO, MnO 2 .