CN207520007U

CN207520007U - Seafood steam cabinet

Info

Publication number: CN207520007U
Application number: CN201720738236.4U
Authority: CN
Inventors: 樊鹏
Original assignee: Beijing Hengrui Static Industry Environmental Protection Equipment Technology Co
Current assignee: Beijing Hengrui Static Industry Environmental Protection Equipment Technology Co
Priority date: 2017-06-23
Filing date: 2017-06-23
Publication date: 2018-06-22
Anticipated expiration: 2027-06-23

Abstract

The utility model discloses a kind of seafood steam cabinet, including gas burner, steamer ontology and finned heat exchanger.After being premixed by the gas premixing device of the utility model to combustion gas and air, when burning on the burner, flame is short, and (burning area calorific intensity and volume calorific intensity are big, the volume of combustion chamber can be reduced, save the raw material of manufacture), it is attached to burner surface, increase heat transfer coefficient, improve the thermal efficiency, combustion intensity is big, burning is more abundant, the temperature of combustion reaction is low compared with air suspended type combustion system, therefore, while CO is relatively low in comburant, the content of NOX is also than relatively low, its thermal efficiency is up to 104% or so, CO in comburant simultaneously, the content of NOX reduces by more than 90%；And by the setting of combustion chamber, the flue gas that band caused by burner has surplus heat can be guided to the finned heat exchanger, and by the heat exchange of the finned heat exchanger, while the temperature of flue gas is reduced, further improve the thermal efficiency of combustion gas.

Description

Seafood steam cabinet

Technical field

The utility model is related to a kind of machine for preparing food more particularly to a kind of seafood steam cabinets.

Background technology

The seafood steam cabinet of the prior art generally provides energy by electric energy or combustion gas, and boiling is boiled and generates water Steam, to achieve the purpose that steam seafood.

When using combustion gas come when providing energy, it is however generally that, gas burner need to be placed in air come realize burning, This allows for an energy part caused by fuel gas buring and is lost in vain so that the thermal efficiency of steamer is relatively low.

Utility model content

The utility model aim is to provide a kind of seafood steam cabinet, by way of gas premixing burning, improves thermal effect Rate.

The utility model solves technical problem and adopts the following technical scheme that：A kind of seafood steam cabinet, including gas burner, Steamer ontology and finned heat exchanger；

The gas burner includes gas premixing device, air blower and burner；

The gas premixing device includes air inlet port and combustion gas inlet port, the air inlet port and air communication, uses In introducing air into gas premixing device；The combustion gas inlet port connects fuel gas supply conduit, by gas supply to the combustion gas Premixed device, and the mixing of realization air and combustion gas in the gas premixing device；

The supply pipe of the gas premixing device and the inlet communication of the air blower, and outlet and the institute of the air blower The mixed gas for stating burner enters pipe connection；

The mixed gas that the burner includes in the semicircular cooking stove of opening upwards and positioned at cooking stove center enters Pipe, the mixed gas enter the fire-collecting ring of one annular of top setting of pipe, one piece of burner plate are put in the top lid of fire-collecting ring, Multiple circular through holes are opened up on burner plate, the rodlike fire tuning pin of filled circles is inserted into part circular through-hole；

The steamer ontology includes combustion chamber and tank；

The combustion chamber is in cubic, and inside has accommodating space, and is offered out on the upper side wall of the combustion chamber Mouthful；

The tank is fixed on the upper side wall of the combustion chamber, and across the opening, positioned at the accommodating sky In；

The burner is located in the combustion chamber, and positioned at the underface of the tank；The gas premixing device It is located at outside the combustion chamber with air blower；

Gas vent is offered on the side wall of the combustion chamber；

The finned heat exchanger includes housing and heat-exchanging component；

The housing is in cubic type, and the lower part of the housing offers air inlet, and the air inlet is connected by air inlet pipe Run in stomata, and the top of the housing offers exhaust outlet, and the exhaust outlet connects exhaust pipe；

In the housing, multiple heat-exchanging components are equally spacedly provided with along the short transverse of the housing；

It is in series between the multiple heat-exchanging component, nethermost heat-exchanging component has water inlet, while uppermost changes Hot component has water outlet, and the water outlet is connected by drainpipe with the tank；

The heat-exchanging component includes：Heat pipe, the first blade and the second blade；

The heat pipe is horizontally disposed with, and its both ends is pierced by the left side wall and right side wall of the housing respectively,

First blade is in tabular, and is parallel to the axis of the heat pipe, and one end in width direction is connected to The outer wall of the heat pipe, and set along the radial direction of the heat pipe；

Second blade includes flat part and arc sections, and the flat part is parallel to the axis of the heat pipe, described flat One end in the width direction of plate portion is connected to the outer wall of the heat pipe, the angle between the flat part and first blade It is 135-160 °；

The other end in the width direction of the flat part is connected to one end in the arc sections circumferential direction, and the circle There is gap between the other end and the flat part in arc portion circumferential direction.

Optionally, the gas premixing device includes premixed device housing, supply pipe and fuel gas injection portion；

Premixed device housing has inner cavity chamber in inside, and the upper end of the inner cavity chamber is air inlet port；

Supply pipe is mounted on the right end of premixed device housing, and mixing flow path, the mixing flow path are formed in the inside of supply pipe It connects, and is mutually perpendicular to the inner cavity chamber；

Offer through-hole on the premixed device housing, axis and the supply pipe of the through-hole on the premixed device housing Axis overlaps；

The fuel gas injection portion includes：Nozzle, inside are equipped with fuel gas supply flow path；Nozzle bracket, for nozzle to be pacified It fills and is supported on premixed device housing；

Wherein, the nozzle passes through the through-hole on the premixed device housing, and in the supply pipe.

Optionally, the heat-exchanging component further includes third blade and quaterfoil, the third blade and quaterfoil Structure is identical, and is symmetrical arranged along the plane where first blade；The cross section of the third blade is arc-shaped, and Its length direction is parallel to the axial direction of the heat pipe, and circumferential one end of the third blade is connected to the lateral wall of the heat pipe On, there is scheduled gap between the circumferential other end of the third blade and the heat pipe.

Optionally, the mixing flow path of the supply pipe includes suction casing, maintaining segment and diffuser；The suction casing is located at institute Premixed device enclosure interior is stated, and is gradually reduced along simulation model for mixing gases flows direction radius；The both ends of the maintaining segment connect respectively Suction casing and diffuser, the diameter of the maintaining segment are remained unchanged along simulation model for mixing gases flows direction；And the diffuser is straight Diameter becomes larger along the flow direction of mixed gas.

The utility model has the advantages that：Combustion gas and air are carried out by the gas premixing device of the utility model After premix, when burning on the burner, flame is short, and (burning area calorific intensity and volume calorific intensity are big, can reduce combustion chamber Volume saves the raw material of manufacture), being attached to burner surface, (the reliable heat exchanger of flame front increases heat transfer coefficient, carries High thermal efficiency), combustion intensity is big, and burning is more abundant, and the temperature of combustion reaction is low compared with air suspended type combustion system, therefore, comburant While middle CO is relatively low, for the content of NOX also than relatively low, the thermal efficiency is up to 104% or so, while CO, NOX in comburant Content reduce by more than 90%.

Description of the drawings

Fig. 1 is the structure diagram of the steamer ontology of the utility model；

Fig. 2 is the schematic cross-sectional view of the steamer ontology of the utility model；

Fig. 3 is the structure diagram of the finned heat exchanger of the utility model；

Fig. 4 is the structure diagram of the heat-exchanging component of the utility model；

Fig. 5 is the structure diagram of the burner of the utility model；

Fig. 6 is the structure diagram of the fiery plate of collection of the utility model；

The part enlarged structure schematic diagram of the burner of Fig. 7 the utility model；

The part enlarged structure schematic diagram of another embodiment of the burner of Fig. 8 the utility model；

Fig. 9 is the structure diagram of the gas premixing device of the utility model；

Figure 10 is the part-structure enlarged diagram of Fig. 9；

Figure 11 is the structure diagram of the control system of the gas premixing device of the utility model；

The mark in the figure shows：101- premixed device housings；102- supply pipes；103- fuel gas injections portion；104- inner cavity chamber； 105- suction casings；106- maintaining segment；107- diffusers；108- nozzles；109- nozzle brackets；The first sealings of 110-；111- is close Packing；112- fuel gas supply conduits；The second sealings of 113-；114- third sealings；201- cooking stoves；202- fire-collecting rings；203- The fiery plate of collection；204- mixed gas enters pipe；205- circular through holes；206- fire tuning pins；301- housings；302- heat-exchanging components；303- Air inlet pipe；304- exhaust pipes；305- heat pipes；The first blades of 306-；The second blades of 307-；308- third blades；The 4th leaves of 309- Piece；401- combustion chambers；402- tanks；403- burners；404- gas vents.

Specific embodiment

The technical solution of the utility model is further elaborated with reference to embodiment and attached drawing.

Embodiment 1

A kind of seafood steam cabinet is present embodiments provided, including gas burner, steamer ontology and finned heat exchanger.

The gas burner includes gas premixing device, air blower and burner；The steamer ontology include combustion chamber and Tank.

The gas premixing device includes air inlet port and combustion gas inlet port, the air inlet port and air communication, uses In introducing air into gas premixing device, the combustion gas inlet port connects fuel gas supply conduit, by gas supply to the combustion gas Premixed device, and the mixing of realization air and combustion gas in the gas premixing device.

The inlet communication of the mixed gas outlet of the gas premixing device, i.e. supply pipe and the air blower, and it is described The outlet of air blower enters pipe with the mixed gas of the burner and connects, so as to be adjusted in the unit interval by the air blower Into the mixed gas total amount of the burner.

In the present embodiment, the burner is included in the semicircular cooking stove of opening upwards and positioned at the mixed of cooking stove center It closes gas and enters pipe, the mixed gas enters the fire-collecting ring of one annular of top setting of pipe, one is put in the top lid of fire-collecting ring Block burner plate opens up the fire output hole of multiple circular through holes on burner plate, and the rodlike fire tuning of filled circles is inserted into the fire output hole of part Pin.

It is highly preferred that the internal diameter of the fire-collecting ring is 20-30cm, the internal diameter of the diameter of the burner plate and the fire-collecting ring Identical, the thickness of the burner plate is 25 to 35 millimeters.

Moreover, the circular through hole is uniformly distributed along the circumferencial direction of the burner plate, and along the half of the burner plate Diameter direction is set as multiple row, and preferably, can be that 5-9 is arranged, the total quantity of the circular through hole is 250-350 at this time； Moreover, a diameter of 3-4mm of the circular through hole.

The fire tuning pin is truncated cone-shaped structure, so as to can preferably block fire output hole and easily be covered in out fire It is unlikely on hole to fall, it is easy to adjust.

In the present embodiment, the fire output hole can be up big and down small bellmouth, and the fire tuning pin is in match with it, and institute The outer diameter for stating one end being relatively large in diameter of fire tuning pin is more than the maximum gauge of the fire output hole, is adjusted so as to facilitate to extract.

The stainless steel of burner plate and fire tuning pin for 1400 DEG C of high temperature resistant or more, takes this material, has preferable using effect Fruit and service life.

Moreover, the quantity of the fire tuning pin is the 12 to 20% of the fire output hole quantity.

In the present embodiment, the gas premixing device it include premixed device housing 101, supply pipe 102 and fuel gas injection portion 103。

Premixed device housing has inner cavity chamber 104 in inside, and flows into air to the side of inner cavity chamber, for example, the inner cavity The upper end of room is air inlet port.

Supply pipe can be mounted on the right end of premixed device housing, and supply pipe inhales the inner cavity chamber by premixed device enclosure interior It the air that enters and is mixed to be provided to burner by the combustion gas that fuel gas injection portion is sprayed.

Mixing flow path can be formed in the inside of supply pipe, in the mixing flow path, the combustion gas and air mix, And the mixing flow path connects, and be mutually perpendicular to the inner cavity chamber, so that the air entered is in the inner cavity Room and the junction of mixing flow path form turbulent flow, and further such that combustion gas and air can be uniformly mixed.

It is highly preferred that the mixing flow path of the supply pipe includes suction casing 105, maintaining segment 106 and diffuser 107；It is described Suction casing is located at the premixed device enclosure interior, and is gradually reduced along simulation model for mixing gases flows direction radius；It is it is highly preferred that described The busbar of suction casing is the circular arc protruded to the inside of the supply pipe；The both ends of the maintaining segment connect suction casing and expansion respectively Section is dissipated, the diameter of the maintaining segment is remained unchanged along simulation model for mixing gases flows direction；And the diameter of the diffuser is along gaseous mixture The flow direction of body becomes larger, such as the busbar of the diffuser is inclined straight line；So as to setting by above-mentioned supply pipe Put, mixed gas enabled to be mixed again in the supply pipe, so as to effectively improve combustion gas and air mixing it is equal Even property.

Through-hole is offered on the premixed device housing, the axis of the through-hole is overlapped with the axis of the supply pipe, this reality It applies in example, the fuel gas injection portion includes：Nozzle 108, inside are equipped with fuel gas supply flow path；Nozzle bracket 109, for that will spray Mouth is installed and is supported on premixed device housing.

Wherein, the nozzle passes through the through-hole, and in the suction casing of the supply pipe.

Supply pipe can have the first sealing 110 for keeping air-tightness, and first sealing is arranged on supply It manages the binding site with premixed device housing and can prevent mixed gas from revealing.

In order to control into the amount of the combustion gas of gas premixing device, in the present embodiment, the gas premixing device further includes control system System, the control system include controller, pressure sensor and gas ratio valve；The pressure sensor is installed on the premix In device housing, for detecting the pressure for entering the air in the premixed device housing；The pressure sensor signal is connected to institute Controller is stated, the pressure signal detected is transmitted to the controller, and the controller, can according to the pressure signal It obtains entering the air capacity in the gas premixing device, so as to control the aperture of the gas ratio valve, be passed through with control described Fuel gas injection portion enters the amount of the combustion gas of the gas premixing device；That is, in the present embodiment, the gas ratio valve series connection In fuel gas supply conduit, the nozzle left end in the fuel gas injection portion is inserted into the fuel gas supply conduit, and in order to keep nozzle Air-tightness between fuel gas supply conduit can set the first sealing in the left end of nozzle.

Specifically, the model ET36 of the controller；The model CYYZ11 of the pressure sensor；The combustion gas ratio The model VR8205A of example valve.

Moreover, nozzle bracket is used for nozzle support and is installed to the side of premixed device housing, it can be in the peripheral surface of nozzle It expands and is formed to radial direction.

Specifically, the side of the premixed device housing offers counterbore, and annular groove is offered on the bottom surface of the counterbore, Gasket 111 is provided in the annular groove；On the nozzle bracket convex annular is formed with relative to the position of the annular groove It rises, when the fuel gas injection portion is fixed on the premixed device housing, the protrusion is in close contact with the gasket.

It, can be in the side of the counterbore for the nozzle bracket is caused to be installed on the premixed device housing in the present embodiment Internal thread is offered on wall, external screw thread is offered in the outside wall surface of the nozzle bracket, so as to by the internal thread and outside The nozzle bracket is fixed on the premixed device housing by the cooperation of screw thread.

The gas premixing device further includes fuel gas supply conduit 112, and the left end of the nozzle bracket is inserted into the combustion gas and supplies Pipeline is answered, and the second sealing 113 is also formed between the nozzle bracket and the fuel gas supply conduit.

Meanwhile third sealing 114 is additionally provided between the nozzle and the premixed device housing, wherein, described first Sealing, the second sealing and third sealing are sealing ring.

The combustion chamber is in cubic, and is prepared by materials such as stainless steels, and inside has accommodating space, and described Opening is offered on the upper side wall of combustion chamber.

The tank is fixed on the upper side wall of the combustion chamber, in the accommodating space, and is passed through stainless Prepared by the materials such as steel, such as the cylindrical container that the tank is upper end opening, and the upper end is along its radial direction shape Into there is flange, the flange is fixed on the upper side wall of the combustion chamber, and so that the tank be placed in it is described In accommodating space.

The burner is located in the combustion chamber, and positioned at the underface of the tank, in the burner During burning, the tank is heated, so that the boiling water in the tank；The gas premixing device and drum Wind turbine is set to outside the combustion chamber.

Gas vent is offered on the side wall of the combustion chamber.

The finned heat exchanger includes housing and heat-exchanging component.

The housing is in cubic type, has preferably, in the housing, the short transverse of the housing is provided with one Row heat-exchanging component (is equally spacedly provided with multiple heat-exchanging components).

Moreover, the lower part of the housing offers air inlet, the air inlet is connect by air inlet pipe with gas vent, will The flue gas of the high temperature of combustion chamber discharge enters by the air inlet pipe and air inlet in the housing, and in the housing Heat-exchanging component exchange heat, meanwhile, the top of the housing offers exhaust outlet, and the exhaust outlet connects exhaust pipe, will Gas discharge after cooling；In the present embodiment, the position of the air inlet and exhaust outlet is staggered in the vertical direction, for example, institute The left part that air inlet is located at the bottom wall of the housing is stated, the exhaust outlet is located at the right part of the upper wall of the housing.

That is, the finned heat exchanger includes multiple heat-exchanging components, it is in series between the multiple heat-exchanging component, So as to form an entirety；At this point, the nethermost heat-exchanging component has water inlet, while uppermost heat-exchanging component has Water outlet, so as to after cold water is into the heat-exchanging component, respectively by all heat-exchanging components, and from uppermost heat exchange group The water outlet discharge of part, at this point, the water of discharge is hot water, the water outlet is connected by drainpipe with the tank, When water shortage in tank, moisturizing is carried out to tank using the hot water, so as to efficiently utilize seafood steam cabinet Waste heat caused by during fuel gas buring.

In the present embodiment, the structure of the heat-exchanging component is identical, includes：Heat pipe, the first blade and the second blade；

When the heat-exchanging component is set in the housing, the heat pipe is horizontally disposed with, and its both ends is pierced by respectively The left side wall and right side wall of the housing, and cold water is discharged by the heat pipe to become warm water.

First blade is in tabular, and is parallel to the axis of the heat pipe, and one end in width direction is connected to The outer wall of the heat pipe, and set along the radial direction of the heat pipe；When in use, i.e., it is installed on when by the heat-exchanging component When in the housing, the flow direction of first blade and high temperature air at an angle, such as 30-60 °.

Second blade includes flat part and arc sections, and the flat part is parallel to the axis of the heat pipe, described flat One end in the width direction of plate portion is connected to the outer wall of the heat pipe, and cause the flat part and first blade it Between angle be 135-160 °.

The other end in the width direction of the flat part is connected to one end in the arc sections circumferential direction, and the circle There is gap, so as to increase by the arc sections to high temperature air between the other end and the flat part in arc portion circumferential direction Resistance, reduce the flowing velocity of high temperature air, improve efficiency of heat exchanger；Moreover, the arc sections can also be to high temperature air In particulate matter be removed, when by the finned heat exchanger of the present embodiment be applied to flue gas UTILIZATION OF VESIDUAL HEAT IN when, can be effective Reduce the particle content in flue gas in ground.

It is highly preferred that the heat-exchanging component can also include third blade and quaterfoil, the third blade and the 4th The structure of blade is identical, and is symmetrical arranged along the plane where first blade；In the present embodiment, the third blade Cross section is arc-shaped, and its length direction is parallel to the axial direction of the heat pipe, circumferential one end connection of the third blade In on the lateral wall of the heat pipe, there is scheduled gap between the circumferential other end of the third blade and the heat pipe, So as to increase the contact area of the heat-exchanging component and high temperature air by the third blade and quaterfoil, thus into One step improves heat exchange efficiency.

The finned heat exchanger of the utility model, by the setting of heat-exchanging component, in the flue gas that high temperature can be efficiently used Entrained heat, and due to the structure design of first blade, the second blade, third blade and quaterfoil, no The energy of the flue gas of high temperature, and the particle content that can be effectively reduced in the flue gas of discharge can only be efficiently used.

After being premixed by the gas premixing device of the utility model to combustion gas and air, when burning on the burner, fire Flame is short (burning area calorific intensity and volume calorific intensity are big, can reduce the volume of combustion chamber, save the raw material of manufacture), attachment In burner surface (the reliable heat exchanger of flame front increases heat transfer coefficient, improves the thermal efficiency), combustion intensity is big, and burning is more Fully, the temperature of combustion reaction is low compared with air suspended type combustion system, and therefore, while CO is relatively low in comburant, the content of NOX also compares Relatively low, the thermal efficiency is up to 104% or so, while the content of CO, NOX reduce by more than 90% in comburant.

And by the combustion chamber of closing, the flue gas that band caused by burner has surplus heat can be guided to the fin Formula heat exchanger, and by the heat exchange of the finned heat exchanger, while the temperature of flue gas is reduced, further improve combustion gas The thermal efficiency.

The sequencing of above example is not only for ease of description, represent the quality of embodiment.

Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that： It still can modify to the technical solution recorded in foregoing embodiments or which part technical characteristic is carried out etc. With replacement；And these modifications or replacement, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution The spirit and scope of scheme.

Claims

1. a kind of seafood steam cabinet, which is characterized in that including gas burner, steamer ontology and finned heat exchanger；

The gas burner includes gas premixing device, air blower and burner；

The gas premixing device includes air inlet port and combustion gas inlet port, the air inlet port and air communication, for inciting somebody to action Air introduces gas premixing device；The combustion gas inlet port connects fuel gas supply conduit, by gas supply to the gas premixing Device, and the mixing of realization air and combustion gas in the gas premixing device；

The supply pipe of the gas premixing device and the inlet communication of the air blower, and the outlet of the air blower and the combustion The mixed gas of burner enters pipe connection；

The burner includes entering pipe in the semicircular cooking stove of opening upwards and the mixed gas positioned at cooking stove center, institute The fire-collecting ring that mixed gas enters one annular of top setting of pipe is stated, one piece of burner plate is put in the top lid of fire-collecting ring, is burning Multiple circular through holes are opened up on plate, the rodlike fire tuning pin of filled circles is inserted into part circular through-hole；

The steamer ontology includes combustion chamber and tank；

The combustion chamber is in cubic, and inside has accommodating space, and opening is offered on the upper side wall of the combustion chamber；

The tank is fixed on the upper side wall of the combustion chamber, and across the opening, in the accommodating space；

The burner is located in the combustion chamber, and positioned at the underface of the tank；The gas premixing device and drum Wind turbine is located at outside the combustion chamber；

Gas vent is offered on the side wall of the combustion chamber；

The finned heat exchanger includes housing and heat-exchanging component；

The housing is in cubic type, and the lower part of the housing offers air inlet, and the air inlet is connected by air inlet pipe and arranged Stomata, the top of the housing offer exhaust outlet, and the exhaust outlet connects exhaust pipe；

It is in series between the multiple heat-exchanging component, nethermost heat-exchanging component has water inlet, while uppermost heat exchange group Part has water outlet, and the water outlet is connected by drainpipe with the tank；

First blade is in tabular, and is parallel to the axis of the heat pipe, and one end in width direction is connected to described The outer wall of heat pipe, and set along the radial direction of the heat pipe；

Second blade includes flat part and arc sections, and the flat part is parallel to the axis of the heat pipe, the flat part Width direction on one end be connected to the outer wall of the heat pipe, the angle between the flat part and first blade is 135-160°；

The other end in the width direction of the flat part is connected to one end in the arc sections circumferential direction, and the arc sections There is gap between the other end and the flat part in circumferential direction.

2. seafood steam cabinet according to claim 1, which is characterized in that the gas premixing device includes premixed device housing, supplies It should manage and fuel gas injection portion；

Supply pipe is mounted on the right end of premixed device housing, and mixing flow path, the mixing flow path and institute are formed in the inside of supply pipe Inner cavity chamber's connection is stated, and is mutually perpendicular to；

Offer through-hole on the premixed device housing, the axis of the through-hole on the premixed device housing and the axis of the supply pipe It overlaps；

The fuel gas injection portion includes：Nozzle, inside are equipped with fuel gas supply flow path；Nozzle bracket, for by nozzle installation and It is supported on premixed device housing；

3. seafood steam cabinet according to claim 2, which is characterized in that the heat-exchanging component further includes third blade and the 4th Blade, the third blade is identical with the structure of quaterfoil, and is symmetrical arranged along the plane where first blade；Institute The cross section for stating third blade is arc-shaped, and its length direction is parallel to the axial direction of the heat pipe, the week of the third blade To one end be connected on the lateral wall of the heat pipe, have between the circumferential other end of the third blade and the heat pipe Scheduled gap.

4. seafood steam cabinet according to claim 3, which is characterized in that the mixing flow path of the supply pipe include suction casing, Maintaining segment and diffuser；The suction casing is located at the premixed device enclosure interior, and along simulation model for mixing gases flows direction radius by It is decrescence small；The both ends of the maintaining segment connect suction casing and diffuser respectively, and the diameter of the maintaining segment is along simulation model for mixing gases flows Direction remains unchanged；And the diameter of the diffuser becomes larger along the flow direction of mixed gas.