A gas mixer

Abstract

The present invention discloses a gas mixer, comprising an air main pipe and an annular gas pipe, the annular gas pipe is arranged around the air main pipe, the pipe wall of the air main pipe is provided with at least two vent arrays, the vent arrays are arranged along the axial direction of the air main pipe, each of the vent arrays comprises a plurality of through holes arranged along the circumferential direction of the air main pipe, the through holes of different vent arrays are staggered in the axial direction of the air main pipe, the air main pipe and the annular gas pipe are connected through the through holes, the annular gas pipe is laterally connected with a gas inlet pipe, the connection port formed by the gas inlet pipe and the annular gas pipe is located between adjacent vent arrays, and the caliber of the connection port is not greater than the axial spacing between adjacent vent arrays. The present invention has a simple structure, is easy to maintain, and has a good mixing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel-air mixing devices and relates to a gas mixer. Background Art

[0002] The Chinese patent with publication number CN219510791U discloses a perforated plate type low nitrogen burner head, which forms a non-clogging surface combustion device by cooperating with the insert sheet through the long hole opened on the surface of the cavity to achieve low nitrogen combustion. The key to achieving low nitrogen combustion is not only related to the burner structure, but also requires that the gas and air be fully premixed before entering the burner. The existing premixer structure that can fully achieve the premixing of gas and air is relatively complex, and the premixer with a simple structure often has a poor premixing effect, which affects combustion. Summary of the invention

[0003] In view of the defects of the prior art, the task of the present invention is to provide a gas mixer which has a simplified structure and is easy to maintain under the premise of ensuring sufficient pre-qualification of gas and air.

[0004] The technical solution of the present invention is: a gas mixer, comprising an air main pipe and an annular gas pipe, the annular gas pipe is arranged around the air main pipe, the pipe wall of the air main pipe is provided with at least two vent hole arrays, the vent hole arrays are arranged along the axial direction of the air main pipe, each of the vent hole arrays comprises a plurality of through holes arranged along the circumferential direction of the air main pipe, the through holes of different vent hole arrays are staggered in the axial direction of the air main pipe, the air main pipe and the annular gas pipe are communicated through the through holes, the annular gas pipe is laterally connected to a gas intake pipe, a connection port formed by the gas intake pipe and the annular gas pipe is located between adjacent vent hole arrays, and the caliber of the connection port is not greater than the axial spacing between adjacent vent hole arrays.

[0005] Furthermore, a swirl blade is arranged in the air main pipe downstream of the vent hole array.

[0006] Further, the aperture of the through holes of the vent array located upstream is larger than the aperture of the through holes of the vent array located downstream.

[0007] Furthermore, an annular support plate is provided in the air main pipe, the swirl blade is located in the central through hole of the annular support plate, the end of the swirl blade is connected to the annular support plate, the air main pipe is provided with a limiter for limiting the axial movement distance of the annular support plate, and a plurality of air flow holes are opened on the annular support plate.

[0008] Furthermore, there are at least two swirl blades, and the swirl blades are arranged at intervals along the axial direction of the air main pipe, and the swirl directions of adjacent swirl blades are opposite.

[0009] Furthermore, it comprises a plurality of support columns arranged along the axial direction of the air main pipe, and the support columns are plugged and fixed with the annular support plates to control the spacing between adjacent annular support plates.

[0010] Furthermore, the annular gas pipe is closely arranged to the main air pipe, and the pipe wall of the main air pipe constitutes the annular inner wall of the annular gas pipe.

[0011] Furthermore, the gas inlet pipe and the air main pipe are arranged vertically.

[0012] The advantages of the present invention compared with the prior art are:

[0013] The gas is introduced at different positions of the circumferential and axial directions of the pipe wall of the air main pipe, and the purpose of sufficient mixing is achieved by using the air flow to impact the gas flow and combining the disturbance of the swirl blades. In the air main pipe, only the swirl blades need to be arranged, so that the internal structure is simple, and the swirl blades can be taken out during maintenance to simplify the maintenance work. The overall structure of the present invention is simple, easy to manufacture, and has a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of a gas mixer according to an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the air main.

[0016] Figure 3 It is a schematic diagram of the coordinated structure of the swirl blades, the annular support plate and the support column.

[0017] Figure 4 It is a schematic diagram of the position relationship between the vent array of the air main pipe and the annular gas pipe and the gas inlet pipe.

[0018] Figure 5 This is a velocity streamline simulation diagram of a gas mixer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0020] like Figures 1 to 4 As shown, a gas mixer according to an embodiment of the present invention comprises an air main pipe 1 and an annular gas pipe 2. The air main pipe 1 is a section of a circular straight pipe, and flanges 101 can be provided at both ends thereof for connecting a blower and a burner respectively.

[0021] The annular gas pipe 2 is an annular pipeline arranged around the air main pipe 1. In this embodiment, in order to simplify the connection between the two, the annular gas pipe 2 is arranged closely to the air main pipe 1, and the pipe wall of the air main pipe 1 naturally constitutes the inner wall of the annular gas pipe 2. This design reduces the number of parts, simplifies the assembly process, and also reduces the material cost and production complexity. The annular gas pipe 2 is laterally connected to a gas intake pipe 3, and the gas intake pipe 3 is arranged perpendicular to the air main pipe 1. The gas intake pipe 3 provides gas to the annular gas pipe 2.

[0022] Since the aforementioned annular gas pipe 2 is closely arranged with the air main pipe 1, no additional pipeline is required between the annular gas pipe 2 and the air main pipe 1 for conduction. Two vent arrays 102 are arranged on the pipe wall of the air main pipe 1. In other embodiments, three vent arrays 102 can be arranged. Considering the convenience of manufacturing and the actual mixing effect, two vent arrays 102 are the best choice. The vent arrays 102 are arranged along the axial direction of the air main pipe 1. Each vent array 102 includes a plurality of through holes arranged along the circumference of the air main pipe 1. These through holes are arranged at equally divided positions in the circumference of the air main pipe 1. The gas entering the annular gas pipe 2 from the gas inlet pipe 3 enters the air main pipe 1 from these through holes.

[0023] In order to optimize the flow of gas in the mixer, avoid direct impact of gas on air, and improve the mixing effect, the through holes of different vent arrays 102 are staggered in the axial direction of the air main pipe 1, and the connection port formed by the gas inlet pipe 3 and the annular gas pipe 2 is located between adjacent vent arrays 102, and the caliber of the connection port is not greater than the axial spacing between adjacent vent arrays 102, so that the vent array 102 will not face the connection port. In addition, the through hole diameter of the vent array 102 located upstream is larger than the through hole diameter of the vent array 102 located downstream. The staggered array makes the entry point of the gas more dispersed, which is conducive to disrupting the flow of air and fully mixing.

[0024] As a preferred embodiment, in order to make the air and gas mix more fully in the air main pipe 1, a swirl blade 4 is also provided in the air main pipe 1. In this embodiment, two swirl blades 4 are provided. The two swirl blades are arranged at intervals along the axial direction of the air main pipe 1, and the swirl directions of the swirl blades 4 are opposite. For example, the first swirl blade 4 makes the airflow rotate clockwise and the second swirl blade 4 makes the airflow rotate counterclockwise. For the convenience of maintenance, the swirl blades 4 are not fixedly arranged in the air main pipe 1. An annular support plate 5 is connected to the periphery of each swirl blade 4, and the end of the swirl blade 4 is connected to the annular support plate 5. The swirl blade 4 is located in the central through hole of the annular support plate 5. The outer diameter of the annular support plate 5 is equivalent to the inner diameter of the air main pipe 1, and a plurality of airflow holes 501 are provided on the annular support plate 5. It should be pointed out that the swirl blade 4 shown in the figure has not been twisted yet, and it only shows the state of the annular support plate 5 and the swirl blade 4 formed by cutting a circular piece. The airflow deflection effect can be generated by rotating each piece of the swirl blade 4. The front and rear annular support plates 5 are connected by a plurality of support columns 6, which are plugged into the annular support plates 5. The spacing between the two annular support plates 5, that is, the spacing between the two swirl blades 4, is controlled by the support columns 6. At this point, the swirl blades 4 can still move axially in the air main pipe 1. Under the action of the airflow, the swirl blades 4 will move toward the outlet end of the air main pipe 1. In order to control the swirl blades 4, the aperture of the through hole opened on the flange 101 at the outlet end of the air main pipe 1 is slightly smaller than the outer diameter of the annular support plate 5, so as to form a limiter for controlling the movement of the swirl blades 4.

[0025] like Figure 5 As shown in the velocity streamline simulation diagram, the embodiment of the present invention can fully mix air and fuel gas for low-nitrogen combustion with the cooperation of the vent array 102 and the swirl blades 4, and the structure is easy to manufacture and maintain.

Claims

1. A gas mixer, characterized in that: The invention comprises an air main pipe and an annular gas pipe, wherein the annular gas pipe is arranged around the air main pipe, and the pipe wall of the air main pipe is provided with at least two vent hole arrays, wherein the vent hole arrays are arranged along the axial direction of the air main pipe, and each of the vent hole arrays comprises a plurality of through holes arranged along the circumferential direction of the air main pipe, and the through holes of different vent hole arrays are arranged alternately in the axial direction of the air main pipe, the air main pipe and the annular gas pipe are communicated through the through holes, and a gas inlet pipe is connected to the side of the annular gas pipe, and a connection port formed by the gas inlet pipe and the annular gas pipe is located between adjacent vent hole arrays, and the caliber of the connection port is not greater than the axial spacing between adjacent vent hole arrays.

2. The gas mixer according to claim 1, characterized in that: The aperture of the through holes of the vent array located upstream is larger than the aperture of the through holes of the vent array located downstream.

3. The gas mixer according to claim 1, characterized in that: A swirl blade is arranged in the air main pipe downstream of the vent hole array.

4. The gas mixer according to claim 3, characterized in that: An annular support plate is arranged in the air main pipe, the swirl blade is located in the central through hole of the annular support plate, the end of the swirl blade is connected to the annular support plate, the air main pipe is provided with a limiter for limiting the axial movement distance of the annular support plate, and a plurality of air flow holes are provided on the annular support plate.

5. The gas mixer according to claim 3, characterized in that: There are at least two swirl blades, and the swirl blades are arranged at intervals along the axial direction of the air main pipe, and the swirl directions of adjacent swirl blades are opposite.

6. The gas mixer according to claim 4, characterized in that: It comprises a plurality of support columns arranged axially along the air main pipe, at least two swirl blades, the swirl blades are arranged at intervals along the axial direction of the air main pipe, the swirl directions of adjacent swirl blades are opposite, and the support columns are plugged and fixed with the annular support plates to control the spacing between adjacent annular support plates.

7. The gas mixer according to claim 1, characterized in that: The annular gas pipe is closely arranged with the main air pipe, and the pipe wall of the main air pipe constitutes the annular inner wall of the annular gas pipe.

8. The gas mixer according to claim 1, characterized in that: The gas inlet pipe is arranged vertically to the air main pipe.

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