CN220506710U

CN220506710U - Full-premix combustion structure with high control precision and gas water heater

Info

Publication number: CN220506710U
Application number: CN202321793830.5U
Authority: CN
Inventors: 徐宁; 邓艳文
Original assignee: Siyuan Electric Appliances Co ltd
Current assignee: Siyuan Electric Appliances Co ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2024-02-20
Anticipated expiration: 2033-07-07

Abstract

The utility model discloses a full premix combustion structure with high control precision and a gas water heater, comprising a premix main body, wherein a plurality of premix chambers which are not communicated with each other are formed in the premix main body in a hollow mode, a plurality of gas inlets, a plurality of air inlets and a plurality of air outlets are formed in the premix main body, and the gas inlets, the air inlets and the air outlets are respectively communicated with the corresponding premix chambers in a one-to-one correspondence mode; the injection pipes are arranged in the corresponding premixing cavities in a one-to-one correspondence manner so as to be respectively communicated with the corresponding gas inlets and the corresponding air inlets; the flow equalizing plates are provided with a plurality of vent holes, are arranged at the corresponding air outlets in a one-to-one correspondence manner and are respectively connected with the premixing main body; the fire covers are arranged above the corresponding flow equalizing plates in a one-to-one correspondence manner and are respectively connected with the premixing main body; the full premixing effect is better.

Description

Full-premix combustion structure with high control precision and gas water heater

Technical Field

The utility model relates to the technical field of combustors, in particular to a full premix combustion structure with high control precision and a gas water heater.

Background

The combustion premixing mode of the gas water heater is mainly divided into two types, namely partial premixing (atmospheric combustion) and full premixing. The structure and control of atmospheric combustion are simpler, but because of the limitation of the premixing mode, the gas flame cannot be completely combusted, the combustion efficiency is low, and the nitrogen oxide content is high. The full premix combustion technology belongs to advanced combustion technology, has high combustion efficiency, and has extremely low content of carbon monoxide, nitrogen oxides and the like in the flue gas. The full premixing is divided into a front-mounted air blowing mode and a rear-mounted air exhausting mode, wherein fuel gas of the rear-mounted air exhausting mode is sprayed into the injection pipe through a nozzle of the air inlet pipe, and then air is simultaneously brought into the injection pipe due to the action of the injection pipe, so that the fuel gas and the air are fully premixed in the injection pipe, and the full premixing effect is general due to the small volume of the injection pipe. The preposed air blasting mode generally adopts a single premixing cavity to perform full premixing, has higher precision requirements on a fan, a controller and a proportional valve, and is difficult to be suitable for the sectional control gas water heater with high precision requirements.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art and provides a full-premix combustion structure with better full-premix effect and high control precision and a gas water heater.

According to an embodiment of the first aspect of the present utility model, a full premix combustion structure with high control accuracy includes: the premixing main body is hollow to form a plurality of mutually non-communicated premixing cavities, and is provided with a plurality of gas inlets, a plurality of air inlets and a plurality of air outlets which are respectively communicated with the corresponding premixing cavities in a one-to-one correspondence manner; the injection pipes are arranged in the corresponding premixing cavities in a one-to-one correspondence manner so as to be respectively communicated with the corresponding gas inlets and the corresponding air inlets; the flow equalizing plates are provided with a plurality of vent holes, are arranged at the corresponding air outlets in a one-to-one correspondence manner and are respectively connected with the premixing main body; the fire covers are arranged above the corresponding flow equalizing plates in a one-to-one correspondence mode and are respectively connected with the premixing main body.

According to some embodiments of the utility model, the air inlet is connected to the air inlet of the premixing chamber, and the air inlet is connected to the air inlet of the premixing chamber.

According to some embodiments of the utility model, the premixing cavity is funnel-shaped, the injection pipe is arranged at the lower half part of the premixing cavity, the air inlet is arranged at the bottom end of the premixing cavity, the air outlet is arranged at the top end of the premixing cavity, the lower half part of the premixing cavity is narrow, air and fuel gas are conveniently injected, the air and the fuel gas are injected to the upper half part of the premixing cavity through the injection pipe, the space of the upper half part of the premixing cavity is sufficient, and the air and the fuel gas can be better fully premixed.

According to some embodiments of the utility model, the lower pipe orifice of the injection pipe is communicated with the air inlet, the upper pipe orifice of the injection pipe is communicated with the premixing cavity, and the top end of the injection pipe is lower than the gas inlet, so that gas enters the premixing cavity through the gas inlet, and air enters the premixing cavity through the injection pipe.

According to some embodiments of the utility model, a lower pipe orifice of the injection pipe is communicated with the air inlet, an upper pipe orifice of the injection pipe is communicated with the premixing cavity, a round table is arranged on the injection pipe to be abutted against the inner wall of the premixing cavity, an annular groove capable of being communicated with the premixing cavity is formed between the round table and the top end of the injection pipe, and the gas inlet is communicated with the annular groove; when the top of the injection pipe is higher than the gas inlet, the gas enters the premixing cavity through the annular groove due to the existence of the annular groove, and the round table is abutted with the inner wall of the premixing cavity so as to prevent the injection pipe from being separated from the premixing cavity.

According to some embodiments of the utility model, a limiting step is arranged in the premixing cavity, a plurality of limiting bosses which are arranged at intervals are arranged at the annular groove, the top ends of the limiting bosses are abutted against the limiting step, the annular groove is communicated with the premixing cavity by the plurality of limiting bosses which are arranged at intervals, and the abutting of the limiting bosses and the limiting steps can prevent the injection pipe from extending further into the premixing cavity, so that stable connection between the injection pipe and the premixing cavity is ensured.

According to some embodiments of the utility model, the pipeline of the injection pipe comprises a diversion section, and the diversion section is gradually narrowed from bottom to top, so that the diversion effect on air is achieved, and the premixing efficiency is improved.

According to some embodiments of the present utility model, the middle part of the flow equalization plate is recessed to form a pressure reduction region, and the premixed gas flows upwards due to the funnel shape with the premixing cavity, so that the pressure in the middle part of the flow equalization plate is the maximum, and when the body hits the pressure reduction region, the gas flows towards two ends of the pressure reduction region, so that the pressure of the gas on the middle part of the flow equalization plate is reduced, and the pressure in each region on the flow equalization plate is uniform.

The full premix combustion structure with high control precision provided by the embodiment of the utility model has at least the following beneficial effects: the air enters the injection pipe through the air inlet and diverges into the premixing cavity, the fuel gas enters the premixing cavity through the fuel gas inlet, and the fuel gas in the premixing cavity is premixed with the dispersed air, so that the air and the fuel gas can be well fully premixed due to the large volume of the premixing cavity, and the premixed starting body flows to the fire cover through the flow equalizing plate and flows to the fire cover through the vent hole to burn in the fire hole on the fire cover; compared with a single premixing cavity, the accuracy of the gas adjusting ratio is higher, the single premixing cavity can only adjust one adjusting valve to achieve the wanted fire, the accuracy requirement on the adjusting valve is high, the premixing cavities correspond to the multi-way adjusting valves, the gas adjusting ratio can be accurately controlled by controlling the multi-way adjusting valves, and the sectional control is convenient to achieve.

According to the embodiment of the second aspect of the utility model, the gas water heater comprises the full-premix combustion structure with high control precision and the gas inlet pipe, wherein the proportional valve is arranged on the gas inlet pipe, the gas inlet pipe is communicated with the gas inlet, and the gas inlet amount is regulated through the proportional valve, so that the fire power is controlled.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The following describes the embodiments of the present utility model further with reference to the drawings;

FIG. 1 is an overall block diagram of a fully premixed combustion structure with high control accuracy;

FIG. 2 is an exploded structural view of a fully premixed combustion structure with high control accuracy;

FIG. 3 is a schematic cross-sectional view of a fully premixed combustion structure with high control accuracy and an airflow direction.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

Referring to fig. 1 to 3, the full premix combustion structure with high control precision comprises a premix main body 10, a plurality of injection pipes 20, a plurality of flow equalizing plates 30 and a plurality of fire covers 40, wherein a plurality of premix chambers 11 which are not communicated with each other are formed in the premix main body 10 in a hollow mode, a plurality of gas inlets 12, air inlets 13 and gas outlets 14 which are respectively communicated with the corresponding premix chambers 11 in a one-to-one correspondence mode are formed in the premix main body 10, the gas inlets 12 are arranged on the side portion of the premix main body 10, and the air inlets 13 are arranged at the bottom of the premix main body 10; the ejector pipes 20 adopt venturi pipes, and a plurality of ejector pipes 20 are arranged in the corresponding premixing cavities 11 in a one-to-one correspondence manner so as to be respectively communicated with the corresponding gas inlets 12 and the corresponding air inlets 13; the flow equalizing plates 30 are provided with a plurality of vent holes, and the flow equalizing plates 30 are arranged at the corresponding air outlets 14 in a one-to-one correspondence manner and are connected with the premixing main body 10; the fire covers 40 are arranged above the corresponding flow equalization plates 30 in a one-to-one correspondence manner and are respectively connected with the premixing main body 10; the air enters the injection pipe 20 through the air inlet 13 and diverges to the premixing cavity 11, the fuel gas enters the premixing cavity 11 through the fuel gas inlet 12, the fuel gas in the premixing cavity 11 is premixed with the dispersed air, and the premixing cavity 11 has a large volume, so that the air and the fuel gas can be well fully premixed, the premixed starting body flows to the fire cover 40 through the flow equalizing plate 30 in a flow equalizing manner and flows into the fire cover 40 through the vent holes to be combusted in the fire holes on the fire cover 40; and the accuracy of the gas regulation ratio is higher in a plurality of premixing cavities 11 compared with that of a single premixing cavity 11, the single premixing cavity 11 can only regulate one regulating valve to achieve the wanted fire, the accuracy requirement on the regulating valve is very high, and the plurality of premixing cavities 11 correspond to the multi-way regulating valve, the gas regulation ratio can be accurately controlled by controlling the multi-way regulating valve, and the sectional control is convenient to realize.

In some embodiments, a wind scooper 50 is further included, the wind scooper 50 being connected to the premix body 10 to enclose the plurality of air inlets 13, facilitating air to be collected by the blower device into the wind scooper 50 and along the air inlets 13 into the premix chamber 11.

In some embodiments, a plurality of sealing rings 60 are further included in one-to-one correspondence with the premixing chambers 11, and the sealing rings 60 are disposed at the air outlets 14 of the corresponding premixing chambers 11 and respectively abut against the premixing main body and the corresponding fire cover 40 to increase the sealing waterproof effect.

As shown in fig. 2, the fire covers 40 are sequentially connected to form a single body or an integral casting, and the sealing rings 60 are sequentially connected to form a single body or an integral injection molding, so that the structure is simple and the manufacture and the assembly are convenient.

As shown in fig. 3, in some embodiments, the premixing main body 10 and the premixing cavity 11 are in a funnel shape narrowing gradually from top to bottom, the injection pipe 20 is arranged at the lower half part of the premixing cavity 11, the air inlet 13 is arranged at the bottom end of the premixing cavity 11, the air outlet 14 is arranged at the top end of the premixing cavity 11, the lower half part of the premixing cavity 11 is narrow, air and fuel gas are conveniently injected, the air and the fuel gas are injected to the upper half part of the premixing cavity 11 through the injection pipe 20, the space of the upper half part of the premixing cavity 11 is sufficient, and the air and the fuel gas can be better fully premixed.

In some embodiments, the lower pipe orifice of the injection pipe 20 is communicated with the air inlet 13, the upper pipe orifice of the injection pipe 20 is communicated with the premixing cavity 11, and the pipeline of the injection pipe 20 comprises a diversion section which is gradually narrowed from bottom to top, so that the diversion effect on air is achieved, and the premixing efficiency is improved; the top of the injection pipe 20 is lower than the gas inlet, so that gas enters the premixing cavity 11 through the gas inlet 12, and air enters the premixing cavity 11 through the injection pipe 20, and the structure is simple and convenient to realize.

As shown in fig. 2 and 3, in some embodiments, a lower nozzle of the injection pipe 20 is communicated with the air inlet 13, an upper nozzle of the injection pipe 20 is communicated with the premixing cavity 11, a round table 21 is arranged on the injection pipe 20 to be abutted against the inner wall of the premixing cavity 11, an annular groove 22 capable of being communicated with the premixing cavity 11 is formed between the round table 21 and the top end of the injection pipe 20, and the gas inlet 12 is communicated with the annular groove 22; when the top of the injection pipe 20 is higher than the gas inlet 12, the gas enters the premixing cavity 11 through the annular groove 22 due to the existence of the annular groove 22, and the round table 21 abuts against the inner wall of the premixing cavity 11 to prevent the injection pipe 20 from being separated from the premixing cavity 11.

In some embodiments, the premixing cavity 11 is provided with a limiting step 15, the annular groove 22 is provided with a plurality of limiting bosses 23 arranged at intervals, the top ends of the limiting bosses 23 are abutted against the limiting step 15, the annular groove 22 is communicated with the premixing cavity 11 by the plurality of limiting bosses 23 arranged at intervals, and the abutting of the limiting bosses 23 and the limiting steps 15 can prevent the injection pipe 20 from further extending into the premixing cavity 11, so that stable connection between the injection pipe 20 and the premixing cavity 11 is ensured.

As shown in fig. 2 and fig. 3, in some embodiments, the middle portion of the flow equalizing plate 30 is recessed to form a pressure reducing area 31, and the premixed gas flows upwards due to the funnel shape with the premixing cavity 11, so that the pressure in the middle portion of the flow equalizing plate 30 is maximum, and when the body hits the pressure reducing area 31, the gas flows towards two ends of the pressure reducing area 31, so that the pressure of the gas on the middle portion of the flow equalizing plate 30 is reduced, and the pressure in each area on the flow equalizing plate 30 is uniform.

The utility model also comprises a gas water heater which comprises the full premix combustion structure with high control precision and a plurality of gas inlet pipes, wherein each gas inlet pipe is provided with a proportional valve, the plurality of gas inlet pipes are communicated with the corresponding gas inlet 12 in a one-to-one correspondence manner, and the gas inlet amount of the gas can be regulated more accurately by controlling the plurality of proportional valves, so that the fire power is controlled, and the sectional control is facilitated.

It will be readily appreciated by those skilled in the art that the above preferred modes can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims

1. The utility model provides a full premix combustion structure that control accuracy is high which characterized in that includes:

the premixing main body is hollow to form a plurality of mutually non-communicated premixing cavities, and is provided with a plurality of gas inlets, a plurality of air inlets and a plurality of air outlets which are respectively communicated with the corresponding premixing cavities in a one-to-one correspondence manner;

the injection pipes are arranged in the corresponding premixing cavities in a one-to-one correspondence manner so as to be respectively communicated with the corresponding gas inlets and the corresponding air inlets;

the flow equalizing plates are provided with a plurality of vent holes, are arranged at the corresponding air outlets in a one-to-one correspondence manner and are respectively connected with the premixing main body;

the fire covers are arranged above the corresponding flow equalizing plates in a one-to-one correspondence mode and are respectively connected with the premixing main body.

2. The full premix combustion structure with high control accuracy according to claim 1, characterized in that: the air guide cover is connected with the premixing main body to enclose a plurality of air inlets.

3. The full premix combustion structure with high control accuracy according to claim 1, characterized in that: the premixing cavity is funnel-shaped, the injection pipe is arranged at the lower half part of the premixing cavity, the air inlet is arranged at the bottom end of the premixing cavity, and the air outlet is arranged at the top end of the premixing cavity.

4. The full premix combustion structure with high control accuracy according to claim 1, characterized in that: the lower pipe orifice of the injection pipe is communicated with the air inlet, the upper pipe orifice of the injection pipe is communicated with the premixing cavity, and the top end of the injection pipe is lower than the gas inlet.

5. The full premix combustion structure with high control accuracy according to claim 1, characterized in that: the lower pipe orifice of the injection pipe is communicated with the air inlet, the upper pipe orifice of the injection pipe is communicated with the premixing cavity, the injection pipe is provided with a round table which is in butt joint with the inner wall of the premixing cavity, an annular groove which can be communicated with the premixing cavity is formed between the round table and the top end of the injection pipe, and the fuel gas inlet is communicated with the annular groove.

6. The high-control-precision full premix combustion structure according to claim 5, wherein: the premixing cavity is internally provided with a limiting step, a plurality of limiting bosses arranged at intervals are arranged at the annular groove, and the top ends of the limiting bosses are abutted to the limiting step.

7. The high-control-precision full premix combustion structure according to claim 5, wherein: the pipeline of the injection pipe comprises a diversion section, and the diversion section is gradually narrowed from bottom to top.

8. The full premix combustion structure with high control accuracy according to claim 1, characterized in that: the middle part of the flow equalizing plate is sunken to form a decompression area.

9. A gas water heater, characterized in that: the full premix combustion structure with high control precision and the gas inlet pipe comprise the full premix combustion structure with high control precision and the gas inlet pipe, wherein a proportional valve is arranged on the gas inlet pipe, and the gas inlet pipe is communicated with the gas inlet.