CN218166587U - Gas mixing device - Google Patents

Abstract

The utility model provides a gas mixing device, which comprises a mixing component and a diffusion component, wherein the mixing component is provided with an inlet and an outlet, and a first airflow enters the mixing component from the inlet; the diffusion assembly is arranged in an inner cavity of the mixing assembly and contains second airflow, the diffusion assembly at least comprises a first diffusion cavity close to the inlet and a second diffusion cavity close to the outlet, and a plurality of diffusion holes are formed in the cavity walls of the first diffusion cavity and the second diffusion cavity to enable the second airflow to flow out of the diffusion assembly. Make the second air current near import department and near the exit homoenergetic spill over in the blending subassembly from the diffusion subassembly, realize the secondary blending in the blending subassembly, be favorable to improving the homogeneity that first air current and second air current mix, and then guaranteed to provide the better air admission of homogeneity for the test piece of low reaches.

Description

Gas mixing device

Technical Field

The utility model relates to an aeroengine tests technical field, in particular to gaseous mixing device.

Background

In the field of aircraft engine testing, two gases with different components or different temperatures are often blended according to different test requirements. For example, adding a small amount of heat/cold air to cold/hot air to adjust the inlet temperature of the test piece, or adding a small amount of oxygen to air entering the combustion chamber test piece to increase the oxygen concentration, requires a gas blending device to be arranged on the inlet pipeline of the test piece.

At present, the internal flow channel and the structural design of the gas mixing device in the prior art are not good, so that the temperature, the components, the flow field and the like of mixed gas flow have great nonuniformity, and great flow loss is generated at the same time.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a gas mixing device for overcoming the defect that there is great inhomogeneity in the air current after the mixing among the prior art.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a gas blending device comprising:

the mixing component is provided with an inlet and an outlet, and the first air flow enters the mixing component from the inlet;

the diffusion component is arranged in the inner cavity of the mixing component and contains second airflow, the diffusion component at least comprises a first diffusion cavity close to the inlet and a second diffusion cavity close to the outlet, and a plurality of diffusion holes are formed in the cavity walls of the first diffusion cavity and the second diffusion cavity to enable the second airflow to flow out of the diffusion component.

In this scheme, through setting up first diffusion chamber and second diffusion chamber for the second air current is being close to import department and is being close to the exit and all can spill over in the mixing subassembly from the diffusion subassembly, realizes the secondary mixing in the mixing subassembly, is favorable to improving the homogeneity that first air current and second air current mix, and then has guaranteed to provide the better air admission of homogeneity for the test piece in low reaches.

Preferably, the diffusion assembly further comprises a third diffusion cavity, the third diffusion cavity is connected between the first diffusion cavity and the second diffusion cavity, and a plurality of diffusion holes are formed in the wall of the third diffusion cavity.

In this scheme, from the import to the export of mixing subassembly, be equipped with first diffusion chamber in proper order in the inner chamber of mixing subassembly, third diffusion chamber and second diffusion chamber, all be equipped with a plurality of diffusion holes on the chamber wall in three diffusion chamber and supply the second air current to flow to first air current gets into the back from the import of mixing subassembly, can pass through first diffusion chamber in proper order, third diffusion chamber and second diffusion chamber are until flowing to the export, have just also realized the cubic mixing in the mixing subassembly, have further improved the homogeneity that first air current and second air current mix. Meanwhile, the arrangement of the first diffusion cavity, the third diffusion cavity and the second diffusion cavity makes full use of the flow path of the first main flow, and the first airflow and the second airflow can be further fully mixed.

Preferably, the first air stream flows from the inlet to the outlet, and the diffuser assembly extends in the direction of flow of the first air stream.

Preferably, the axial direction of the diffusion holes is always perpendicular to the extending direction of the wall surface of the diffusion component;

and/or the diffusion holes are distributed on the peripheral surface of the diffusion component.

In the scheme, the first air flow always flows along the outer wall of the diffusion assembly, namely the axial direction of the diffusion holes is always vertical to the flowing direction of the first air flow, namely the flowing direction of the second air flow is always vertical to the flowing direction of the first air flow, so that the second air flow can reach the maximum penetration depth, high-strength mixing without dead angles is realized, and the uniformity of air flow mixing is ensured;

the diffusion holes are distributed on the circumferential surface of the diffusion component, so that the uniformity of air flow mixing is further ensured.

Preferably, the diameter or width of the first diffusion chamber increases gradually from the inlet to the outlet;

and/or, the diameter or width of the second diffusion chamber gradually decreases in the direction from the inlet to the outlet.

In the scheme, by adopting the structural form, the resistance of the windward side of the first diffusion cavity can be reduced, and the flow loss of the first airflow is further reduced;

the generation of vortex can be avoided, and the flow loss of the first airflow is further reduced.

Preferably, the diffusion assembly is movably disposed relative to the blending assembly.

In this scheme, adopt above-mentioned structural style, can adjust the relative position of diffusion subassembly and mixing subassembly to make the first diffusion chamber of diffusion subassembly aim at the import of mixing subassembly and make the second diffusion chamber aim at the export of mixing subassembly, so on the one hand will reduce the flow resistance of import department, on the other hand makes the second air current that flows out from diffusion subassembly circumference can with the first air current homogeneous contact that the import got into, guarantees the homogeneity of air current mixture.

Preferably, the diffusion component comprises a diffusion part and a connecting part, the diffusion part is provided with the first diffusion cavity, the second diffusion cavity and the third diffusion cavity, and the connecting part extends from the diffusion part along the radial direction of the blending component towards the direction far away from the diffusion part and is rotatably connected to the blending component.

In this scheme, the one end that diffusion portion was kept away from to connecting portion is rotated and is connected in the mixing subassembly for connecting portion and diffusion portion can use the axis of connecting portion to rotate as the pivot, thereby when diffusion subassembly is not aimed at the import, can make both aim at through rotating diffusion subassembly, thereby be favorable to guaranteeing that first air current and second air current fully contact, intensive mixing, on the other hand also is favorable to reducing the flow resistance of import department.

Preferably, the connecting portion is provided with an inner cavity communicated with the outside of the mixing component, the inner cavity of the connecting portion, the first diffusion cavity, the second diffusion cavity and the third diffusion cavity are communicated with each other, and the second airflow enters the first diffusion cavity, the second diffusion cavity and the third diffusion cavity from the connecting portion.

In the scheme, the second airflow can be introduced into the first diffusion cavity, the second diffusion cavity and the third diffusion cavity by introducing the second airflow into the connecting part, and because one end of the connecting part, which is far away from the diffusion part, is connected with the wall surface of the mixing component and extends out of the mixing component, the extending part is convenient to be connected with an external airflow pipe, so that the airflow is convenient to be introduced into the diffusion part inside the mixing component; the first diffusion cavity, the second diffusion cavity and the third diffusion cavity are communicated with each other, so that the flowability and the uniformity of the second airflow in the diffusion part are improved.

Preferably, the connecting portion is rotatably connected to the blending component through a flange, and the flange is embedded in the blending component.

In this scheme, connect through the flange rotation and realized the horizontal pivot angle that can adjust diffusion subassembly to realized that diffusion subassembly can be adjusted for the position of mixing subassembly. The external pipeline is connected to the mixing component through the other flange, and the flange for connecting the connecting portion and the mixing component is embedded in the mixing component, so that the connection between the external pipeline and the mixing component is not affected, and the functional integrity of the gas mixing device is guaranteed.

Preferably, at least one sealing element is arranged between the flange and the connecting surface of the blending component.

In this scheme, adopt above-mentioned structural style, on the one hand, the sealing member has the effect of sealed second air current, is favorable to guaranteeing the gas tightness, and on the other hand, the sealing member can also adjust the height of diffusion subassembly for the mixing subassembly to make the axis of diffusion subassembly coaxial with the axis of mixing subassembly, so will form the even circumferential weld in clearance between diffusion subassembly and the mixing subassembly, the second air current can reach equal penetration depth in diffusion subassembly's circumference, is favorable to improving the homogeneity that the air current mixes.

Preferably, the blending component has an expansion section connected to the inlet, the diameter or width of the expansion section increasing in a direction from the inlet to the outlet.

In the scheme, the expansion section has the functions of diffusion and deceleration, so that the mixing time of the first air flow and the second air flow is more abundant, and the mixing uniformity of the first air flow and the second air flow is further ensured.

Preferably, the orthographic projection of the diffuser element is outside the flared section.

In this scheme, adopt above-mentioned structural style, first air current mixes with the second air current in the diffusion subassembly again after the speed reduction of expansion section, has prolonged the mixing time of first air current and second air current, is favorable to further guaranteeing the mixing homogeneity of air current.

Preferably, the gas blending device further comprises a flow straightening assembly disposed within the inner cavity of the blending assembly and between the diffuser assembly and the outlet.

In the scheme, the rectifying assembly avoids poor flow uniformity caused by the existence of vortexes in the mixed gas flow; meanwhile, two air flows of high-intensity mixing and outlet rectification are integrated in a small space of the mixing component, the whole structure is compact, and the occupied space is small.

Preferably, the rectifying assembly comprises a honeycomb assembly, the peripheral surface of the honeycomb assembly is fixedly connected to the inner wall of the mixing assembly, and the honeycomb assembly is of a hexagonal small-hole thin-wall structure;

and/or the rectifying assembly comprises a screen assembly, the peripheral surface of the screen assembly is fixedly connected with the inner wall of the blending assembly, the screen assembly comprises a screen and a frame, and the screen is arranged in front of the frame along the flowing direction of the first airflow.

In the scheme, the airflow vortex can be guided and cut, and the turbulence degree of the airflow in the transverse direction and the longitudinal direction can be effectively reduced;

the screen assembly can reduce the axial turbulence of the airflow and also can block dust and impurities in the incoming flow.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses a set up first diffusion chamber and second diffusion chamber for the second air current is being close to import department and is being close to the exit homoenergetic and overflowing in diffusion subassembly to the mixing subassembly, realizes the secondary mixing in the mixing subassembly, is favorable to improving the homogeneity that first air current and second air current mix, and then has guaranteed to provide the better air admission of homogeneity for the low reaches test piece.

Drawings

Fig. 1 is a schematic structural diagram of a gas blending device according to a preferred embodiment of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 isbase:Sub>A schematic view of the cross-sectional structurebase:Sub>A-base:Sub>A in fig. 1.

Fig. 4 is a schematic structural view of a section B-B in fig. 1.

Description of the reference numerals

First air flow X1

Second air flow X2

Gas blending device 100

Blending component 1

Inlet 11

An outlet 12

Expansion section 13

Diffusion assembly 2

First diffusion chamber 21

Second diffusion chamber 22

Third diffusion chamber 23

Diffuser portion 24

Connecting part 25

Reinforcing bar 26

Flange 3

Sealing element 4

Rectifier assembly 5

Honeycomb module 51

Honeycomb panel 511

Screen assembly 52

Wire mesh 521

Frame 522

Edge cover 523

Corner ear 53

Detailed Description

The present invention will be more clearly and completely described in the following detailed description of the preferred embodiments in conjunction with the accompanying drawings.

As shown in fig. 1 to 4, the embodiment discloses a gas blending device 100, which includes a blending component 1 and a diffusion component 2, wherein the blending component 1 is provided with an inlet 11 and an outlet 12, and a first gas flow X1 enters the blending component 1 from the inlet 11; the diffusion component 2 is arranged in an inner cavity of the blending component 1 and contains a second airflow X2, the diffusion component 2 at least comprises a first diffusion cavity 21 close to the inlet 11 and a second diffusion cavity 22 close to the outlet 12, and a plurality of diffusion holes are formed in the cavity walls of the first diffusion cavity 21 and the second diffusion cavity 22 so that the second airflow X2 can flow out of the diffusion component 2.

Through setting up first diffusion chamber 21 and second diffusion chamber 22 for second air current X2 is being close to import 11 department and being close to export 12 department homoenergetic and overflowing in can the blending subassembly 1 from diffusion subassembly 2, realizes the secondary blending in blending subassembly 1, is favorable to improving the homogeneity that first air current X1 and second air current X2 mix, and then has guaranteed to provide the better air admission of homogeneity for the test piece in low reaches.

Specifically, when in use, the pressure of the second air flow X2 is higher than that of the first air flow X1, so that the second air flow X2 will be ejected from the diffusion holes of the diffusion assembly 2, and rapid and high-intensity mixing of the first air flow X1 and the second air flow X2 is realized.

The diffusion component 2 further comprises a third diffusion cavity 23, the third diffusion cavity 23 is connected between the first diffusion cavity 21 and the second diffusion cavity 22, and a plurality of diffusion holes are formed in the wall of the third diffusion cavity 23. That is to say, from import 11 to export 12 of blending subassembly 1, be equipped with first diffusion chamber 21, third diffusion chamber 23 and second diffusion chamber 22 in proper order in the inner chamber of blending subassembly 1, all be equipped with a plurality of diffusion holes on the chamber wall of three diffusion chamber and supply second air current X2 to flow out to first air current X1 gets into the back from import 11 of blending subassembly 1, can pass through first diffusion chamber 21, third diffusion chamber 23 and second diffusion chamber 22 in proper order and flow to export 12, has also realized the cubic mixing in blending subassembly 1, has further improved the homogeneity that first air current X1 and second air current X2 mix. Meanwhile, the arrangement of the first diffusion cavity 21, the third diffusion cavity 23 and the second diffusion cavity 22 fully utilizes the flow path of the first main flow, and further ensures that the first airflow X1 and the second airflow X2 can be fully mixed.

In this embodiment, the axial direction of the diffusion hole is always perpendicular to the extending direction of the wall surface of the diffusion component 2, and the first airflow X1 always flows along the outer wall of the diffusion component 2, that is, the axial direction of the diffusion hole is also always perpendicular to the flowing direction of the first airflow X1, that is, the flowing direction of the second airflow X2 is always perpendicular to the flowing direction of the first airflow X1, so that the second airflow X2 can reach the maximum penetration depth, high-strength mixing without dead angles is realized, and uniformity of airflow mixing is ensured.

To further ensure uniformity of the gas flow mixing, in the present embodiment, the diffusion holes are distributed over the circumferential surface of the diffusion assembly 2.

Specifically, in the direction from the inlet 11 to the outlet 12, the diameter or the width of the first diffusion chamber 21 is gradually increased, so that the resistance of the windward side of the first diffusion chamber 21 can be reduced, and the flow loss of the first airflow X1 is reduced. The diameter or width of the second diffusion chamber 22 is gradually reduced from the inlet 11 to the outlet 12, so that the generation of vortex can be avoided, and the flow loss of the first airflow X1 can be further reduced. In this embodiment, the first diffusion chamber 21 and the second diffusion chamber 22 are each V-cone shaped, with the smaller diameter ends facing the inlet 11 and the outlet 12, respectively. In other embodiments, the first diffusion chamber 21 and the second diffusion chamber 22 may have other shapes.

In the embodiment, the diffusion component 2 is arranged to be movable relative to the blending component 1, so that the relative positions of the diffusion component 2 and the blending component 1 can be adjusted, the first diffusion cavity 21 of the diffusion component 2 is aligned with the inlet 11 of the blending component 1, and the second diffusion cavity 22 is aligned with the outlet 12 of the blending component 1, so that on one hand, the flow resistance at the inlet 11 can be reduced, and on the other hand, the second airflow X2 flowing out from the diffusion component 2 in the circumferential direction can be uniformly contacted with the first airflow X1 entering from the inlet 11, and the uniformity of airflow mixing is ensured.

The diffusion component 2 comprises a diffusion part 24 and a connecting part 25, the diffusion part 24 is provided with a first diffusion cavity 21, a second diffusion cavity 22 and a third diffusion cavity 23, the connecting part 25 extends from the diffusion part 24 in the radial direction of the blending component 1 towards the direction far away from the diffusion part 24 and is rotatably connected to the blending component 1, in particular, the diffusion part 24 extends transversely, the connecting part 25 extends longitudinally, the diffusion part 24 extends into the blending component 1 through the connecting part 25, wherein one end of the connecting part 25 far away from the diffusion part 24 is rotatably connected to the blending component 1, so that the connecting part 25 and the diffusion part 24 can rotate by taking the axis of the connecting part 25 as a rotating shaft, when the diffusion component 2 is not aligned with the inlet 11, the diffusion component 2 can be rotated to align with each other, thereby being beneficial to ensuring that the first airflow X1 and the second airflow X2 are sufficiently contacted and mixed, and being beneficial to reducing the flow resistance at the inlet 11.

Wherein, connecting portion 25 seted up with the inner chamber of the outside intercommunication of mixing subassembly 1, the inner chamber of connecting portion 25, first diffusion chamber 21, second diffusion chamber 22 and third diffusion chamber 23 communicate each other, second air current X2 gets into first diffusion chamber 21 from connecting portion 25, second diffusion chamber 22 and third diffusion chamber 23, so, let in second air current X2 to connecting portion 25 and can realize letting in first diffusion chamber 21 with second air current X2, in second diffusion chamber 22 and the third diffusion chamber 23, because connecting portion 25 keeps away from the one end of diffusion part 24 and the wall connection of mixing subassembly 1 and stretches out mixing subassembly 1, the part that stretches out will be convenient for with outside air current union coupling, thereby be convenient for let in the air current to the diffusion part 24 that is located mixing subassembly 1 inside.

The first diffusion chamber 21, the second diffusion chamber 22 and the third diffusion chamber 23 are communicated with each other, which is beneficial to improving the fluidity and uniformity of the second airflow X2 in the diffusion portion 24.

Specifically, in the embodiment, the connecting portion 25 is rotatably connected to the blending component 1 through the flange 3, and the horizontal swing angle of the diffusion component 2 can be adjusted through the rotatable connection of the flange 3, so that the position of the diffusion component 2 relative to the blending component 1 can be adjusted. Wherein, because the external pipeline is connected to the blending component 1 through another flange, in this embodiment, the flange 3 for connecting the connecting portion 25 and the blending component 1 is embedded in the blending component 1, so that the connection between the external pipeline and the blending component 1 will not be affected, which is beneficial to ensuring the functional integrity of the gas blending device 100.

As shown in fig. 2, at least one sealing element 4 is disposed between the flange 3 and the connection surface of the blending component 1, in this embodiment, the sealing element 4 is a gasket, and in other embodiments, the sealing element 4 may be a sealing ring, on one hand, the gasket has an effect of sealing the second air flow X2, which is beneficial to ensuring air tightness, and on the other hand, the gasket can also adjust the height of the diffusing component 2 relative to the blending component 1, so that the axis of the diffusing component 2 is coaxial with the axis of the blending component 1, so that an annular gap with a uniform gap is formed between the diffusing component 2 and the blending component 1, and the second air flow X2 can reach an equal penetration depth in the circumferential direction of the diffusing component 2, which is beneficial to improving the uniformity of air flow mixing. The number of the gaskets can be adjusted according to the requirements in actual use, and the embodiment is not specifically limited.

The blending assembly 1 is provided with an expansion section 13 connected with the inlet 11, the diameter or the width of the expansion section 13 is gradually increased from the inlet 11 to the outlet 12, and the expansion section 13 has the functions of pressure expansion and speed reduction, so that the mixing time of the first air flow X1 and the second air flow X2 is more abundant, and the mixing uniformity of the first air flow X1 and the second air flow X2 is further ensured; wherein the angle of the expanding section 13 is less than or equal to 15 ° to avoid the separation or local backflow of the first gas flow X1, and further, the angles of the first diffusion chamber 21 and the second diffusion chamber 22 are consistent with or similar to the angle of the expanding section 13 to prevent the local velocity of the mixed flow from being too high during the blending process. Meanwhile, the expansion section 13 is combined with the V-cone-shaped structure of the diffusion assembly 2, so that the flow loss of the first airflow X1 is reduced to the maximum extent, the inlet pressure of a downstream test piece is improved under the condition of limited air supply pressure, and a good energy-saving effect is achieved.

Specifically, the orthographic projection of the diffusion assembly 2 is outside the expansion section 13, so that the first airflow X1 is decelerated by the expansion section 13 and then mixed with the second airflow X2 in the diffusion assembly 2, the mixing time of the first airflow X1 and the second airflow X2 is prolonged, and the mixing uniformity of the mixed airflow is further ensured.

As shown in fig. 2, a rib 26 is further provided at the joint of the connecting portion 25 and the diffusing portion 24 to prevent the joint of the connecting portion 25 and the diffusing portion 24 from cracking due to vibration impact, wherein the ribs 26 are uniformly distributed along the circumferential direction of the connecting portion 25.

In order to avoid poor flow uniformity in the mixed gas stream due to the presence of eddies, the gas blending device 100 further includes a flow straightening assembly 5, the flow straightening assembly 5 being disposed within the interior cavity of the blending assembly 1 and between the diffuser assembly 2 and the outlet 12. Meanwhile, two air flows of high-intensity mixing and outlet 12 rectification are integrated in a small space of the mixing component 1, the whole structure is compact, and the occupied space is small.

Specifically, the rectifying component 5 comprises a honeycomb component 51, the peripheral surface of the honeycomb component 51 is fixedly connected to the inner wall of the blending component 1, and the honeycomb component 51 is of a hexagonal small-hole thin-wall structure, so that airflow vortexes can be guided and cut, and the turbulence degree of the airflow in the transverse direction and the longitudinal direction can be effectively reduced. Specifically, the honeycomb component 51 comprises a honeycomb plate 511 and corner lugs 53, and the honeycomb plate 511 is fixed on the inner wall of the blending component 1 through the corner lugs 53 which are uniformly distributed in the circumferential direction and bolts, so that dust and scale can be cleaned conveniently, or the honeycomb plate is convenient to replace after being damaged by impact of hard objects included in incoming flows.

The flow rectification assembly 5 further comprises a screen assembly 52, the screen assembly 52 is arranged at the downstream of the honeycomb assembly 51, the peripheral surface of the screen assembly 52 is fixedly connected to the inner wall of the blending assembly 1, and the screen assembly 52 can reduce the axial turbulence of the airflow and can block dust and impurities in the incoming flow. Specifically, the screen assembly 52 includes a covering 523, a screen 521 and a frame 522, and the screen 521 is disposed in front of the frame 522 and closely attached to the frame 522 along the flow direction of the first air flow X1, so as to avoid being blown or seriously deformed. In fig. 4, the screen 521 is shown only by a schematic diagram, and does not represent a specific structure of the screen 521.

The screen assembly 52 further comprises angle lugs 53, and the screen 521 and the frame 522 are fixed on the inner wall of the blending assembly 1 through the angle lugs 53 which are uniformly distributed in the circumferential direction and bolts, so that dust and scale can be cleaned conveniently, or the screen can be replaced conveniently after being impacted and damaged by hard objects mixed with incoming flows.

The gas blending device 100 integrates a replaceable honeycomb assembly 51 and a screen assembly 52 dual rectifying element at the outlet 12, eliminates vortex and straightens flow in a short distance, and achieves the effect of uniform flow field at the outlet 12.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (14)

1. A gas blending device, comprising:

the mixing component is provided with an inlet and an outlet, and the first air flow enters the mixing component from the inlet;

the diffusion component is arranged in the inner cavity of the mixing component and contains second airflow, the diffusion component at least comprises a first diffusion cavity close to the inlet and a second diffusion cavity close to the outlet, and a plurality of diffusion holes are formed in the cavity walls of the first diffusion cavity and the second diffusion cavity to enable the second airflow to flow out of the diffusion component.

2. The gas blending device of claim 1, wherein the diffusion assembly further comprises a third diffusion chamber coupled between the first diffusion chamber and the second diffusion chamber, the third diffusion chamber having a plurality of diffusion holes formed in a wall of the third diffusion chamber.

3. The gas blending device of claim 1, wherein the first gas stream flows from the inlet to the outlet, and the diffuser element extends in a direction of flow of the first gas stream.

4. The gas blending device of claim 1, wherein the axial direction of the diffusion holes is always perpendicular to the direction of extension of the wall of the diffuser element;

and/or the diffusion holes are distributed on the peripheral surface of the diffusion component.

5. The gas blending device of claim 1, wherein the diameter or width of the first diffusion chamber increases in a direction from the inlet to the outlet;

and/or, the diameter or width of the second diffusion chamber gradually decreases in the direction from the inlet to the outlet.

6. The gas blending device of claim 1, wherein the diffuser assembly is movably disposed relative to the blending assembly.

7. The gas blending device of claim 2, wherein the diffuser assembly comprises a diffuser portion having the first, second, and third diffusion chambers and a connecting portion extending from the diffuser portion in a radial direction of the blending assembly away from the diffuser portion and rotatably connected to the blending assembly.

8. The gas blending device of claim 7, wherein the connecting portion defines an interior chamber in communication with an exterior of the blending assembly, the interior chamber of the connecting portion, the first diffusion chamber, the second diffusion chamber, and the third diffusion chamber being in communication with one another, and the second gas flow enters the first diffusion chamber, the second diffusion chamber, and the third diffusion chamber from the connecting portion.

9. The gas blending device of claim 7, wherein the coupling is rotatably coupled to the blending component via a flange embedded in the blending component.

10. The gas blending apparatus of claim 9, wherein at least one seal is disposed between the flange and the attachment surface of the blending assembly.

11. The gas blending device of claim 1, wherein the blending assembly has a diverging section connected to the inlet, the diverging section increasing in diameter or width in a direction from the inlet to the outlet.

12. The gas blending device of claim 11, wherein an orthographic projection of the diffuser assembly is outside the expanding section.

13. The gas blending device of claim 1, further comprising a flow straightener assembly disposed within the interior chamber of the blending assembly between the diffuser assembly and the outlet.

14. The gas blending device of claim 13, wherein the flow straightening assembly comprises a honeycomb assembly, wherein the peripheral surface of the honeycomb assembly is fixedly connected to the inner wall of the blending assembly, and the honeycomb assembly is in a hexagonal small-hole thin-wall structure;

and/or the rectifying assembly comprises a screen assembly, the peripheral surface of the screen assembly is fixedly connected with the inner wall of the blending assembly, the screen assembly comprises a screen and a frame, and the screen is arranged in front of the frame along the flowing direction of the first airflow.

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