CN213066102U

CN213066102U - Premixing device and gas water heater

Info

Publication number: CN213066102U
Application number: CN202021524042.2U
Authority: CN
Inventors: 梁泽锋; 钱晓林; 曲绍鹤
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-04-27
Anticipated expiration: 2030-07-27

Abstract

The utility model discloses a premixing device and a gas water heater, wherein, the premixing device comprises a shell and a turbulent flow component; the shell is provided with an air inlet, an air outlet and a premixing chamber communicated with the air inlet and the air outlet; the flow disturbing assembly is arranged in the premixing chamber and comprises first flow swirling blades and second flow swirling blades, and the first flow swirling blades and the second flow swirling blades are arranged at intervals in the air inlet direction of the air inlet. The utility model discloses premixing device's gas and air can mix through the quadratic vortex of first whirl blade and second whirl blade, stirring to make gas and air mixing more even, and this premixing device simple structure, the windage is little.

Description

Premixing device and gas water heater

Technical Field

The utility model relates to a gas heater technical field, in particular to premixing device and gas heater.

Background

At present, in order to make the combustion effect of a gas water heater better, air and gas combusted on a combustor generally need to be mixed through a premixing device and then flow to the combustor. The premixing device on the existing gas water heater is usually a large mixing cavity, so that gas and air respectively flow into the mixing cavity from an inlet, the air and the gas are uniformly diffused all around and mixed together due to the sudden increase of the flowing space of the gas, and the mixed gas flows out from an outlet. In the premixing device, because the air and the gas are completely mixed by the diffusion from the small space to the large space, the uniform mixing of the air and the gas cannot be ensured, and particularly when the flow rate of the air and the gas is high, the phenomenon that part of the air and the gas directly rushes out of a mixing cavity without being mixed exists, so the gas mixing effect is poor.

The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a premixing device aims at solving the premixing device and mixes the poor technical problem of gas effect.

In order to achieve the above object, the premixing device provided by the present invention comprises a housing and a turbulent flow component;

the shell is provided with an air inlet, an air outlet and a premixing chamber communicated with the air inlet and the air outlet;

the flow disturbing assembly is arranged in the premixing chamber and comprises first flow swirling blades and second flow swirling blades, and the first flow swirling blades and the second flow swirling blades are arranged at intervals in the air inlet direction of the air inlet.

In one embodiment, the first swirl vane is mounted in a direction opposite to that of the second swirl vane such that the direction of rotation of the airflow passing through the first swirl vane is opposite to that of the airflow passing through the second swirl vane.

In one embodiment, the first swirl vanes comprise a plurality of first vanes that are spaced apart along a circumference of the premixing chamber, and the second swirl vanes comprise a plurality of second vanes that are spaced apart along a circumference of the premixing chamber; the first blade is opposite to the second blade and is obliquely arranged in the air inlet direction of the air inlet, and/or the first blade is bent towards the air inlet by the second blade.

In an embodiment, in the air intake direction of the air intake, the second blade partially or completely blocks a gap between two adjacent first blades.

In one embodiment, the installation angle of the first swirl vane is greater than or equal to 20 degrees and less than or equal to 60 degrees, and the installation angle of the second swirl vane is greater than or equal to 20 degrees and less than or equal to 60 degrees.

In one embodiment, the distance between the first swirl vane and the second swirl vane is greater than or equal to 5mm and less than or equal to 15 mm.

In an embodiment, a gas outlet communicated with the premixing chamber is formed in a side wall surface of the housing, the gas outlet is located between an air inlet end of the first swirl vane and the air inlet, and the air inlet is an air inlet.

In one embodiment, the gas outlet is a plurality of gas outlets, and the plurality of gas outlets are arranged around the circumference of the outer shell at intervals.

In one embodiment, the first swirl vane blocks the gas outlet in the air inlet direction of the air inlet.

In an embodiment, the shell includes a first cylinder and a second cylinder sleeved on the periphery of the first cylinder, the inside of the first cylinder defines the premixing chamber, openings at two ends of the first cylinder respectively form the air inlet and the air outlet, a gas circulation chamber is defined between the first cylinder and the second cylinder, the gas outlet is arranged on a side wall surface of the first cylinder and communicated with the gas circulation chamber, a gas inlet pipe communicated with the gas circulation chamber is arranged on a side wall surface of the second cylinder, and the gas inlet pipe is used for connecting a gas source.

In one embodiment, the outer end of the first swirl vane and the outer end of the second swirl vane are fixed on the inner wall surface of the shell; or the like, or, alternatively,

the flow disturbing assembly is rotatably arranged in the premixing chamber, and the air supply direction of the first swirl blades is the same as that of the second swirl blades.

The utility model also provides a gas water heater, which comprises a premixing device, wherein the premixing device comprises a shell and a turbulent flow component;

In one embodiment, the gas water heater further comprises a burner, the burner comprising:

the gas premixing device comprises a shell, a gas inlet, a gas outlet, a gas inlet, a gas outlet, a gas inlet and a gas outlet, wherein the shell is formed with a mixed gas distribution chamber, an air preheating chamber and a combustion chamber which are communicated in sequence; and

the preheating burner is arranged in the air preheating chamber and used for igniting the mixed gas discharged from the mixed gas distribution chamber into the air preheating chamber and heating the temperature in the air preheating chamber to a preset temperature.

The utility model discloses premixing device is through setting up the vortex subassembly in premixing the room, and the vortex subassembly includes first whirl blade and second whirl blade, and on the direction of air inlet, first whirl blade is the interval arrangement with second whirl blade and sets up. So, gas and air can mix through the secondary vortex of first whirl blade and second whirl blade, stirring to make gas and air mixing more even, and this premixing device simple structure, the windage is little.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a premixing device according to the present invention;

FIG. 2 is a schematic top view of the premixing device shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of an angle of the premixing device of FIG. 1;

FIG. 4 is a schematic view of the installation angles of the first and second swirl blades of the present invention;

fig. 5 is a schematic structural diagram of an embodiment of the burner of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)	Reference numerals	Name (R)
						10	Premixing device	180	Gas inlet pipe	320	Gas distribution chamber
100	Outer casing	200	Turbulent flow component	330	Mixed gas distribution chamber
						110	Air inlet	210	First swirl vane	340	Air preheating chamber
120	Air outletMouth piece	211	First blade	341	Air outlet
						130	Premixing chamber	220	Second swirl vane	350	Combustion chamber
140	Gas outlet	221	Second blade	351	Flue gas outlet
						150	First cartridge	20	Burner with a burner head	352	Gas outlet
160	Second cylinder	300	Shell body	400	Preheating burner
						170	Gas flow-through chamber	310	Air distribution chamber

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be noted that if the embodiments of the present invention are described with reference to "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied.

The utility model provides a premixing device.

In the present embodiment, as shown in fig. 1 to 3, the premixing device 10 includes a housing 100 and a spoiler assembly 200. The housing 100 has an air inlet 110, an air outlet 120, and a premix chamber 130 communicating the air inlet 110 and the air outlet 120. The flow disturbing assembly 200 is disposed in the pre-mixing chamber 130, the flow disturbing assembly 200 includes a first swirling blade 210 and a second swirling blade 220, and the first swirling blade 210 and the second swirling blade 220 are arranged at intervals in the air inlet direction of the air inlet 110.

In the present embodiment, the cross-sectional shape of the housing 100 may be circular, oval, rectangular, irregular, etc., and is not particularly limited herein. To facilitate installation of the premix apparatus 10, a mounting flange may be provided on the housing 100. The pre-mixing chamber 130 may be provided in various shapes, and the cross-sectional shape thereof may be circular, elliptical, rectangular, etc., and in order to improve the flow disturbance effect of the flow disturbance assembly 200, the cross-sectional shape of the pre-mixing chamber 130 is generally circular. The number of the air inlets 110 and the air outlets 120 may be one or more. The shape of the air inlet 110 and the air outlet 120 may be circular, elliptical, rectangular, etc. When there is one air inlet 110, then the air inlet 110 can deliver both gas and air into the premix chamber 130. Of course, it is also possible to provide a gas or air inlet on the casing 100 by making the air inlet 110 separately input air or gas, so that the premix chamber 130 can input air and gas at the same time. When the number of the air inlets 110 is two or more, the gas and the air may be respectively input into the premixing chamber 130 through different air inlets 110. Air can be blown in through the fan, and gas can be controlled and input through a gas valve of a gas source.

The first swirl blades 210 may disturb the flow of the gas within the pre-mix chamber 130 such that the flow of the gas forms a rotational flow under the action of the first swirl blades 210. The second swirl blades 220 may turbulate the gas within the premix chamber 130 such that the gas flow is caused to rotate by the second swirl blades 220. The first and

second swirl blades

210 and 220 may have a straight sheet structure or a curved sheet structure. The first and

second swirl blades

210 and 220 may be disposed to be inclined with respect to the air intake direction of the air inlet 110, or may be disposed to be parallel or perpendicular to the air intake direction of the air inlet 110. Only the air flow passing through the first swirl vanes 210 needs to form a swirl flow, and the air flow passing through the second swirl vanes 220 forms a swirl flow. Make first whirl blade 210 and second whirl blade 220 interval setting in the air inlet direction of air inlet 110, then gas and air pass through first whirl blade 210 earlier, force the air current to produce tangential rotary motion for gas and air intensive mixing, later through second whirl blade 220 secondary vortex stirring, make gas and air mix more fully even. The first and

second swirl vanes

210 and 220 may be fixedly installed in the pre-mixing chamber 130, or may be rotatably installed in the pre-mixing chamber 130.

The utility model discloses premixing device 10 is through setting up vortex subassembly 200 in premixing room 130, and vortex subassembly 200 includes first whirl blade 210 and second whirl blade 220, and in the direction of air inlet 110, first whirl blade 210 is the interval arrangement setting with second whirl blade 220. So, gas and air can mix through the secondary vortex of first whirl blade 210 and second whirl blade 220, stirring to make gas and air mixing more even, and this premixing device 10 simple structure, the windage is little.

In one embodiment, referring to fig. 4, the first swirl vane 210 is installed in a direction opposite to that of the second swirl vane 220, so that the direction of the airflow passing through the first swirl vane 210 is opposite to that of the airflow passing through the second swirl vane 220.

In the present embodiment, the installation direction of the first swirl blades 210 is opposite to the installation direction of the second swirl blades 220, meaning that the blades of one of the first and

second swirl blades

210 and 220 are installed in a clockwise direction and the other is installed in a counterclockwise direction in the circumferential direction of the premix chamber 130. So that the airflow blown out via the first swirl vanes 210 and the airflow blown out via the second swirl vanes 220 are counter-rotating. The gas and air first pass through the first swirl vanes 210, forcing the air flow to generate tangential rotational motion, so that the gas and air are primarily mixed, and the mixed gas and air swirl flow enters the second swirl vanes 220 for secondary mixing. Because the installation direction of the second swirl blades 220 is opposite to that of the first swirl blades 210, the laminar state of the gas is broken by the two layers of blades together, the streamline is not clearly distinguished any more, a plurality of small vortexes exist in the flow field, the laminar flows are damaged, and the adjacent flow layers not only slide but also mix to form turbulent flow, so that the gas and the air are fully and uniformly mixed. Only make the installation direction of first whirl blade 210 opposite with the installation direction of second whirl blade 220, just can make gas and the air that blows off through vortex subassembly 200 carry out abundant mixing stirring, mixing efficiency is high, the mixing effect is good, simple structure, resistance are little.

In other embodiments, the mounting direction of the first swirl blade 210 is the same as the mounting direction of the second swirl blade 220, such that the rotational direction of the airflow passing through the first swirl blade 210 is the same as the rotational direction of the airflow passing through the second swirl blade 220. So for gas and air can mix the stirring through the secondary, the misce bene and abundant, and because the installation direction of first whirl blade 210 is the same with the installation direction of second whirl blade 220, make the whole resistance to the air current of vortex subassembly 200 little, thereby the wind loss is little.

Specifically, as shown in fig. 1 to 4, the first swirl vane 210 includes a plurality of first vanes 211, the plurality of first vanes 211 being disposed at intervals in the circumferential direction of the premixing chamber 130, the second swirl vane 220 includes a plurality of second vanes 221, the plurality of second vanes 221 being disposed at intervals in the circumferential direction of the premixing chamber 130; the first blade 211 and the second blade 221 are obliquely arranged relative to the air inlet direction of the air inlet 110, and/or the first blade 211 and the second blade 221 are bent towards the air inlet 110.

In this embodiment, the first blade 211 and the second blade 221 may have a straight sheet structure or a curved sheet structure. The first blade 211 and the second blade 221 may be disposed to be inclined with respect to the intake direction of the intake port 110, or may be disposed to be parallel or perpendicular to the intake direction of the intake port 110. When the first blade 211 and the second blade 221 are arranged in parallel or perpendicular to the air inlet direction of the air inlet 110, the first blade 211 and the second blade 221 are curled, so that the air flow is better rotated, specifically, one end of the first blade 211 is arranged in parallel or perpendicular to the air inlet direction of the air inlet 110, and the other end is bent; one end of the second vane 221 is parallel to or perpendicular to the air inlet direction of the air inlet 110, and the other end is bent. The number of the first vanes 211 and the second vanes 221 may be selected and designed according to the size of the inner diameter of the pre-mixing chamber 130, and is not particularly limited herein.

Such that the plurality of first vanes 211 are spaced apart along the circumferential direction of the premix chamber 130 and the plurality of second vanes 221 are spaced apart along the circumferential direction of the premix chamber 130. In this way, the airflow blown out from the pre-mixing chamber 130 can be disturbed by the first swirl blades 210 and the second swirl blades 220, so that the disturbance of the airflow in the entire pre-mixing chamber 130 is more sufficient. In order to make the flow disturbing effect of the first and

second swirl blades

210 and 220 better, the first blade 211 should be made to cover the first airflow channel as much as possible, and the second blade 221 should be made to cover the second airflow channel as much as possible. To simplify the structure, the spoiler assembly 200 is integrally modularized such that the plurality of first blades 211 are coaxially disposed with the plurality of second blades 221. A hub is provided at the middle of the pre-mixing chamber 130 such that the plurality of first blades 211 and the plurality of second blades 221 are installed around the hub at intervals in the axial direction.

In an embodiment, referring to fig. 1 and fig. 2, in the air intake direction of the air inlet 110, the second blade 221 partially or completely blocks the gap between two adjacent first blades 211. Like this, the air current that blows out through first blade 211 can all or most blow out again after by second blade 221 vortex, can prolong the gas motion route, improves the gas mixing effect, prevents that the air current after first blade 211 vortex from directly blowing out in the clearance of adjacent two second blades 221, reduces the gas mixing effect.

In one embodiment, as shown in FIG. 4, the first swirl vane 210 has an angle of incidence (e.g., α in FIG. 4) greater than or equal to 20 degrees and less than or equal to 60 degrees, and the second swirl vane 220 has an angle of incidence (e.g., β in FIG. 4) greater than or equal to 20 degrees and less than or equal to 60 degrees.

In this embodiment, after the hub is unfolded, a blade profile projection is formed at a boundary between the blade and the hub, the blade profile projection has a leading edge point and a trailing edge point, a connecting line between the leading edge point and the trailing edge point is a chord length, and the installation angle of the blade refers to an included angle between the chord length and the axial direction of the hub. Specifically, the stagger angle of the first swirl blades 210 may be 20 degrees, 25 degrees, 35 degrees, 40 degrees, 45 degrees, 48 degrees, 55 degrees, 60 degrees, or the like. The stagger angle of the second swirl vanes 220 may be 20 degrees, 23 degrees, 25 degrees, 38 degrees, 40 degrees, 45 degrees, 48 degrees, 55 degrees, 60 degrees, etc. The angle of the first swirl vane 210 and the angle of the second swirl vane 220 may be the same or different.

When the installation angle of the first swirl blade 210 and the installation angle of the second swirl blade 220 are smaller than 20 degrees, the included angle between the first swirl blade 210 and the air inlet direction of the air inlet 110 and the included angle between the second swirl blade 220 and the air inlet direction of the air inlet 110 are small, that is, the first swirl blade 210 and the second swirl blade 220 are basically parallel to the air inlet direction, so that the movement path of the gas and the air flowing through the first swirl blade 210 and the second swirl blade 220 is shortened, the effect of the tangential rotational movement of the air flow is poor, and the turbulent flow effect of the first swirl blade 210 and the second swirl blade 220 is poor. When the installation angle of the first and

second swirl blades

210 and 220 is greater than 60 degrees, the first and

second swirl blades

210 and 220 are close to the air inlet direction perpendicular to the air inlet 110, so that the airflow resistance of the entire spoiler assembly 200 is large, and the wind loss flowing through the first and

second swirl blades

210 and 220 is large. By making the installation angle of the first and

second swirl blades

210 and 220 greater than or equal to 20 degrees and less than or equal to 60 degrees, airflow resistance and wind loss are reduced while making the effect of disturbing, stirring and mixing the airflow better.

In the above embodiment combining the opposite installation angle of the first swirl blade 210 and the second swirl blade 220, further, referring to fig. 3, the distance between the first swirl blade 210 and the second swirl blade 220 is greater than or equal to 5mm and less than or equal to 15 mm. The spacing between the first swirl vane 210 and the second swirl vane 220 may be specifically 5mm, 6mm, 6.5mm, 7mm, 8.5mm, 9mm, 10mm, 12mm, 15mm, or the like. When the distance between the first and

second swirl blades

210 and 220 is less than 5mm, the air flow path is shortened, and thus the air flow is not mixed with sufficient space and time, resulting in poor air mixing effect. When the distance between the first swirl vane 210 and the second swirl vane 220 is greater than 15mm, on the one hand, the volume of the whole premixing device 10 can be increased, and on the other hand, the distance between the first swirl vane 210 and the second swirl vane 220 is too large, so that when the swirl blown out by the first swirl vane 210 enters the second swirl vane 220, the swirl effect can be reduced due to long-distance conveying, and the resistance between the in-process airflow and the inner wall surface of the premixing chamber 130 is increased, thereby the effect of mixing the air together by the first swirl vane 210 and the second swirl vane 220 is poor. Through making the interval between first swirl blade 210 and the second swirl blade 220 be more than or equal to 5mm, and be less than or equal to 15mm, make the air current have long enough circulation route, thereby can carry out abundant mixing, and under the reasonable condition of whole premixing device 10 volume, guarantee that the air current passes through behind first swirl blade 210 swirl mixing, can carry out reverse swirl mixing in second swirl blade 220, and then make first swirl blade 210 better with the common gas mixing effect of second swirl blade 220.

In one embodiment, as shown in FIG. 3, the gas outlet 140 is provided on a side wall surface of the casing 100 and is communicated with the pre-mixing chamber 130, and the gas outlet 140 is located between the air inlet 110 and the air inlet 110 of the first swirl vane 210, and the air inlet 110 is an air inlet.

In the present embodiment, the gas and air delivery is further facilitated by providing the side wall surface of the casing 100 with the gas outlet 140, and providing the air inlet 110 as an air inlet, separating the air and gas inlets into the premixing chamber 130. In practice, the premixing device 10 further includes a blower disposed in correspondence with the air inlet 110 for blowing air from the air inlet 110 into the premixing chamber 130. The gas outlet 140 is communicated with a gas source, and the gas output of the gas outlet 140 is controlled by controlling a gas valve. The gas outlet 140 is disposed between the first swirl blades 210 and the gas inlet 110, such that the gas inlet 110 and the gas outlet 140 are both located upstream of the first swirl blades 210, and such that the gas and air entering the pre-mixing chamber 130 can be swirled by the first swirl blades 210 and the second swirl blades 220 and then blown out from the gas outlet 120. Meanwhile, since the fan blows air into the premixing chamber 130 from the air inlet 110, the flow rate of the air inlet 110 is fast, so that after the gas is input into the premixing chamber 130 from the gas outlet 140, the air entering from the air inlet 110 can be fast mixed, and the air drives the gas to flow into the first swirl blades 210 and the second swirl blades 220 together for turbulent mixing.

On the basis of the above embodiment, further, the gas outlet 140 is multiple, and the multiple gas outlets 140 are arranged at intervals around the circumference of the casing 100. Set up gas outlet 140 to a plurality ofly, and set up around the circumference of shell 100, make the circumference homoenergetic that makes premix chamber 130 get into the gas, guarantee the gas input volume in the premix chamber 130 on the one hand, on the other hand makes the gas all can mix with the air from all directions in premix chamber 130, and then promotes the mixed effect of gas and air.

Further, referring to fig. 3 again, in the air intake direction of the air inlet 110, the first swirl vanes 210 are disposed to shield the gas outlet 140. Thus, the flow path of the gas blown out from the gas outlet 140 can be effectively increased, the gas mixing effect is improved, the gas blown out from the gas outlet 140 is prevented from being directly blown out without being disturbed by the first swirl vanes 210, and the gas mixing effect is reduced.

In an embodiment, as shown in fig. 3, the housing 100 includes a first tube 150 and a second tube 160 sleeved on the periphery of the first tube 150, a premixing chamber 130 is defined inside the first tube 150, two openings of the first tube 150 respectively form the air inlet 110 and the air outlet 120, a gas circulation chamber 170 is defined between the first tube 150 and the second tube 160, the gas outlet 140 is disposed on a side wall surface of the first tube 150 and is communicated with the gas circulation chamber 170, a gas inlet pipe 180 communicated with the gas circulation chamber 170 is disposed on a side wall surface of the second tube 160, and the gas inlet pipe 180 is used to connect a gas source.

In the present embodiment, the inside of the first barrel 150 defines the premix chamber 130, and openings at both ends of the first barrel 150 form the air inlet 110 and the air outlet 120. The air inlet 110 and the air outlet 120 are made large enough, and the single air flow in the premixing chamber 130 has a large flow rate, so that the premixing device 10 has a high premixing speed and a high premixing efficiency on the premise of sufficiently mixing the gas and the air. In addition, the air inlet 110 and the air outlet 120 are formed by opening both ends of the first cylinder 150, so that the manufacturing process is simpler, and the processing cost can be saved. By defining the premixing chamber 130 in the first barrel 150 and defining the gas flow-through chamber 170 between the outer wall surface of the first barrel 150 and the inner wall surface of the second barrel 160, the space in and around the first barrel 150 is fully utilized, so that the whole premixing device 10 is more simple and compact in structure. Meanwhile, since the gas outlets 140 are disposed on the side wall surface of the first barrel 150, the gas circulation chamber 170 is disposed around the periphery of the pre-mixing chamber 130, and the gas circulation chamber 170 can directly supply gas to the gas outlets 140, so as to satisfy the gas output amount, and the gas at the plurality of gas outlets 140 is uniformly distributed, and the gas flow path is shortened, so that the gas flows out more smoothly. The gas inlet pipe 180 is used for connecting a gas source to connect the gas into the gas circulation chamber 170, and the gas valve can be arranged on the gas inlet pipe 180 or on the gas source, and only needs to be able to control whether the gas is input into the gas circulation chamber 170.

In one embodiment, the outer ends of the first and

second swirl vanes

210 and 220 are fixed to the inner wall surface of the casing 100.

In the present embodiment, the outer end of the first swirl vane 210 and the outer end of the second swirl vane 220 may be fixed to the inner wall surface of the casing 100 by welding, bonding, or the like. The first and

second swirl vanes

210, 220 may also be integrally formed with the housing 100. The outer ends of the first swirl blades 210 and the second swirl blades 220 are fixed on the inner wall surface of the housing 100, so that the entire spoiler assembly 200 is fixed on the housing 100, and the spoiler assembly 200 is more stably installed and modularized in an integrated manner. Meanwhile, installation structures such as an installation support are not needed to be additionally arranged, so that the installation structure is simplified, the wind resistance in the premixing chamber 130 is reduced, and the premixing effect in the premixing chamber 130 is better.

In another embodiment, the spoiler assembly 200 is rotatably mounted within the premix chamber 130 and the first swirl blades 210 are supplied with air in the same direction as the second swirl blades 220. The entire spoiler assembly 200 can be driven to rotate by arranging the driving device. The spoiler assembly 200 can be driven to rotate by the airflow by arranging the rotating shaft and the bearing. By making the spoiler assembly 200 rotatably disposed in the pre-mixing chamber 130 and making the air blowing direction of the first swirl blades 210 the same as the air blowing direction of the second swirl blades 220, the air flow in the pre-mixing chamber 130 can be further agitated, so that the air flow has high mixing efficiency, fast mixing speed and good mixing effect.

The utility model discloses still provide a gas water heater, this gas water heater include premixing device 10, and this premixing device 10's concrete structure refers to above-mentioned embodiment, because this gas water heater has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.

In one embodiment, referring to fig. 5, the gas water heater further includes a burner 20, and the burner 20 includes a housing 300 and a preheating burner 400. The housing 300 is formed with a mixture gas distribution chamber 330, an air preheating chamber 340, and a combustion chamber 350, which are sequentially communicated. The air preheating chamber 340 has an air outlet 341 for flowing air therein, the gas inlet of the mixed gas distribution chamber 330 is communicated with the gas outlet 120 of the premixing device 10, the combustion chamber 350 has a flue gas outlet 351 and a fuel gas outlet 352, and the fuel gas outlet 352 is communicated with the fuel gas distribution chamber 320 for injecting fuel gas into the combustion chamber 350 so as to enable the combustion chamber 350 to perform high-temperature air combustion reaction. The preheating burner 400 is installed in the air preheating chamber 340, and the preheating burner 400 is used for igniting the mixed gas discharged from the mixed gas distribution chamber 330 into the air preheating chamber 340 and heating the temperature in the air preheating chamber 340 to a preset temperature.

In this embodiment, the cross-sectional shape of the housing 300 may be rectangular, circular, oval, irregular, and the like, and may be selected and designed according to actual requirements, and is not limited herein. The mixed gas distribution chamber 330, the air preheating chamber 340 and the combustion chamber 350 may be linearly arranged (the air passing channel is a straight line), or arranged in a turning line (the air passing channel is a broken line), or arranged in a layer-by-layer surrounding manner (the air flow is blown out from the inside to the outside or from the outside to the inside), or of course, the mixed gas distribution chamber 330, the air preheating chamber 340 and the combustion chamber 350 may be arranged in a combination of a straight line and a surrounding manner, and only the mixed gas distribution chamber 330, the air preheating chamber 340 and the combustion chamber 350 need to be sequentially connected, which is not particularly limited herein. The cross-sectional shapes of the mixture gas distribution chamber 330, the air preheating chamber 340 and the combustion chamber 350 may be circular, elliptical, circular, rectangular, etc., and may be selected and designed according to the actual shape of the housing 300 and the arrangement of the three.

The gas inlet of the mixed gas distribution chamber 330 is communicated with the gas outlet 120 of the premixing device 10, so that the gas entering the mixed gas distribution chamber 330 is the mixed gas of the fully mixed gas and air, and the combustion of the mixed gas in the preheating burner 400 is more uniform. The external air first enters the air distribution chamber 310 of the housing 300, and then enters the air preheating chamber 340 through the air outlet 341, and the air flow can be blown into the air distribution chamber 310 by a blower or the like, and then enters the air preheating chamber 340 relatively uniformly through the air outlet 341. It should be noted that the air outlet 341 is disposed at the air outlet end of the preheating burner 400. That is, after the mixed gas in the mixed gas distribution chamber 330 is combusted by the preheating burner 400, the high temperature flue gas enters the air preheating chamber 340, and simultaneously enters the air preheating chamber 340 from the air outlet 341, so that the cold air is mixed with the high temperature flue gas in the air preheating chamber 340, and the cold air is heated. The heated air and high temperature flue gas enter the combustion chamber 350 to heat the combustion chamber 350. In order to sufficiently and uniformly mix the air with the high-temperature flue gas generated during combustion in the air preheating chamber 340, a plurality of air outlets 341 are provided, and the plurality of air outlets 341 are arranged at intervals around the circumferential wall surface of the air preheating chamber 340. The plurality of air outlets 341 can comb the air into a plurality of uniform air streams, so that the air is more sufficiently and uniformly mixed with the high-temperature flue gas combusted in the air preheating chamber 340. In order to further stir the cold air and the high temperature flue gas in the air preheating chamber 340, a stirring device may be disposed in the air preheating chamber 340 for sufficiently stirring and mixing the cold air and the high temperature flue gas, so that the air is rapidly and uniformly heated to a preset temperature.

The gas in the gas distribution chamber 320 can be controlled by an external gas valve. It will be appreciated that the gas valve is open to a certain gas pressure to allow gas from the gas distribution chamber 320 to be injected from the gas stream outlet 352 into the combustion chamber 350. The gas flow outlet 352 may be specifically an opening formed in the wall surface of the casing 300, or may be an air flow outlet of a gas nozzle or a gas nozzle, so that high-speed jet flow is realized when gas is ejected from the gas flow outlet 352 of the gas injection device. The high-speed ejected gas forms an entrainment effect in the combustion chamber 350, so that an ejection burner and a smoke backflow area are formed in the combustion chamber 350, the high-temperature smoke in the combustion chamber 350 is rapidly and strongly circulated in the combustion chamber 350, the ejected gas and the entering air are fully diluted to form a lower oxygen concentration, the combustion reaction speed is reduced, the higher temperature in the combustion chamber 350 is maintained, the temperature is higher than the spontaneous combustion point of the fuel, and spontaneous combustion is realized. As such, the present embodiment satisfies the condition of high-temperature air combustion (mld combustion): high-temperature preheating air is matched with high-speed jet flow to realize entrainment of high-temperature flue gas and dilution of air jet flow, so that the oxygen concentration is lower than a certain value, and the temperature is higher than the self-ignition point of fuel.

The preheating burner 400 may be a fully premixed burner, and the preheating burner 400 may be installed in the air preheating chamber 340, or may be installed at the gas flow ports of the mixture gas distribution chamber 330 and the air preheating chamber 340, and the preheating burner 400 is used for igniting the mixture gas discharged from the mixture gas distribution chamber 330 to the air preheating chamber 340. Specifically, the burner 20 further includes an ignition device disposed within the housing 300 adjacent the preheat burner 400 for igniting the preheat burner 400. In order to make the combustion uniform, the preheating burner 400 includes a plate-shaped body and a plurality of air holes penetrating through the thickness direction of the plate-shaped body, and the plurality of air holes are used for allowing the mixed gas to pass through and enter the air preheating chamber 340. The plurality of air passing holes can be uniformly or alternatively arranged on the plate-shaped body so as to ensure uniform combustion. The ignition device may be embodied as an electronic igniter or an electric heating wire, so that the power consumption is smaller.

Before the burner 20 is operated, the premixing device 10 mixes the gas and the air in a certain ratio, and after the gas and the air are sufficiently and uniformly mixed, the gas enters the gas inlet 110 of the mixed gas distribution chamber 330 from the gas outlet 120 of the premixing device 10, then enters the mixed gas distribution chamber 330, and is sent to the preheating burner 400. After the preheating burner 400 is ignited by the ignition device, the mixed gas is burned, and then the high-temperature flue gas enters the air preheating chamber 340, and simultaneously the air enters the air preheating chamber 340 from the air distribution chamber 310 through the air outlet 341, and the high-temperature flue gas is mixed with the cold air to heat the cold air. It is understood that the air in the air preheating chamber 340 can be heated to the target temperature, that is, the preset temperature by controlling the heating temperature, so that the high-temperature preheating of the air is realized. Specifically, the burner 20 further includes a temperature measuring device, which is disposed in the air preheating chamber 340. The temperature measuring device is used for detecting whether the temperature of the gas in the air preheating chamber 340 reaches a target temperature, if not, the temperature in the air preheating chamber 340 needs to be increased, the air inlet volume of the air can be controlled, or the ratio of the fuel gas and the air in the mixed gas distribution chamber 330 is controlled to realize temperature adjustment. By detecting the temperature, the preheat burner 400 can automatically adjust the heat load according to the amount of air required for MILD combustion to achieve the effect of quickly preheating the air while ensuring low CO and NOx emissions throughout the combustion process. The temperature measuring device may be a temperature sensor. After the air and the high-temperature flue gas subjected to high-temperature preheating are conveyed to the combustion chamber 350, the gas outlet 352 is controlled to spray gas, the gas is contacted with the high-temperature gas, and the high-temperature gas ignites the gas, so that MILD combustion is formed in the combustion chamber 350. The heat after combustion is discharged through the flue gas outlet 351, and then can exchange heat with the heat exchanger of the gas water heater, so as to realize hot water production.

The gas mixture of gas and air after the intensive mixing of premixing device 10 enters into gas mixture distribution chamber 330, preheat burner 400 and carry out the burning of igniteing to gas mixture, high temperature preheated air has been realized, rethread gas flow export 352 sprays the gas and cooperates and produces the entrainment effect, make the high temperature flue gas backward flow, realize keeping warm on the one hand and make the temperature be higher than the spontaneous combustion point of fuel, make the interior gas of combustion chamber can spontaneous combustion, on the other hand through efflux entrainment dilutes air, make oxygen concentration be less than a definite value, realize the homogeneous combustion, thus, just make the interior high temperature air that takes place of combustion chamber 350 burn. That is to say, the technical scheme of this embodiment is favorable to having reached these two conditions simultaneously, realizes smoothly that high temperature air burns. And, the structure of this kind of combustor frame can be with the subassembly miniaturization that realizes the high temperature air burning for have more application space and value, the noise is low in addition, and the burning is abundant, and it is little to discharge waste gas pollution, when being applied to gas heater and including gas hanging stove etc. use gas burning to produce high temperature hot water and carry out relevant products and equipment that use such as family's shower and heating, not only satisfied the requirement, but also brought the abundant, low pollutant emission's of burning that the combustor did not possess in the current water heater effect. And only set up the gas outlet 352 on the combustion chamber 350 and can realize the injection gas, simple structure, easy realization, and make the structure of whole combustor 20 compacter, the volume is littleer.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A premixing apparatus, comprising:

the air inlet is communicated with the air outlet, and the air outlet is communicated with the air outlet; and

and the turbulence assembly is arranged in the premixing chamber and comprises first swirl blades and second swirl blades, and the first swirl blades and the second swirl blades are arranged at intervals in the air inlet direction of the air inlet.

2. The premixing device of claim 1 wherein the first swirl vane is mounted in an opposite direction to the second swirl vane such that the swirl of the air flow passing through the first swirl vane is opposite to the swirl of the air flow passing through the second swirl vane.

3. The premixing device of claim 2 wherein the first swirl vanes comprise a plurality of first vanes spaced circumferentially along the premixing chamber, the second swirl vanes comprise a plurality of second vanes spaced circumferentially along the premixing chamber; the first blade is opposite to the second blade and is obliquely arranged in the air inlet direction of the air inlet, and/or the first blade is bent towards the air inlet by the second blade.

4. The premixing device of claim 3 wherein said second vanes partially or completely block a gap between adjacent ones of said first vanes in an air intake direction of said air inlet.

5. The premixing device of claim 1 wherein the first swirl vanes have an stagger angle of greater than or equal to 20 degrees and less than or equal to 60 degrees and the second swirl vanes have a stagger angle of greater than or equal to 20 degrees and less than or equal to 60 degrees.

6. The premixing device of claim 2 wherein a spacing between the first swirl vane and the second swirl vane is greater than or equal to 5mm and less than or equal to 15 mm.

7. The premixing device as claimed in any one of claims 1 to 6 wherein a side wall surface of the housing is provided with a gas outlet communicating with the premixing chamber and located between an air inlet end of the first swirl vane and the air inlet, the air inlet being an air inlet.

8. The premixing device of claim 7 wherein the gas outlets are plural and the plural gas outlets are spaced circumferentially around the housing.

9. The premixing device of claim 8 wherein the first swirl vane is disposed to shroud the gas outlet in an intake direction of the gas inlet.

10. The premixing device as claimed in claim 7, wherein the housing comprises a first tube and a second tube sleeved on the periphery of the first tube, the inside of the first tube defines the premixing chamber, openings at two ends of the first tube respectively form the air inlet and the air outlet, a gas circulation chamber is defined between the first tube and the second tube, the gas outlet is arranged on a side wall surface of the first tube and is communicated with the gas circulation chamber, a gas inlet pipe communicated with the gas circulation chamber is arranged on a side wall surface of the second tube, and the gas inlet pipe is used for connecting a gas source.

11. The premixing device of claim 1 wherein,

the outer end of the first rotational flow blade and the outer end of the second rotational flow blade are both fixed on the inner wall surface of the shell; or the like, or, alternatively,

12. A gas water heater comprising a premixing device as claimed in any one of claims 1 to 11.

13. The gas water heater of claim 12, further comprising a burner, said burner comprising: