A mixer and combustion system

Abstract

The application provides a mixer and a combustion system, the mixer comprising: a shell and a piston; the shell has a mixing space inside, the shape of the mixing space is a vertically arranged cylinder, an air inlet and a gas inlet are arranged on the side wall of the mixing space; the shape of the air inlet and the gas inlet is both a rectangle extending along the vertical direction, the center point of the air inlet and the center point of the gas inlet are located on the same horizontal plane, and the length of the air inlet is equal to the length of the gas inlet in the vertical direction; the outer contour of the piston is a cylinder with a diameter matched with the diameter of the mixing space, the piston is arranged in the mixing space and can move in the vertical direction in the mixing space to change the shielding area of the air inlet and the gas inlet. The design is reasonable, the structure is simple, the load ratio can be improved under the condition of ensuring the precision of the air-fuel ratio, and the working adaptability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas combustion, and in particular to a mixer and a combustion system. Background Art

[0002] With the country's increasing emphasis on environmental protection, various regions have successively introduced standards to limit nitrogen oxide (NOx) emissions. Among the many low-NOx combustion technologies, high-excess air fully premixed combustion is a commonly adopted method. Fully premixed combustion means that the gas is evenly mixed with all the combustion air before it exits the burner head. This significantly suppresses high-temperature spots in the flame, significantly reducing flame temperature and nitrogen oxide formation under high excess air conditions.

[0003] The mixer is the core equipment in the full premixed combustion technology. The existing mixed gas needs to work with the zero-pressure valve to control the air-fuel ratio (the ratio of air and gas) entering the mixer. The cross-sectional areas of the air intake channel and the gas intake channel in the mixer are fixed. After the air-fuel ratio entering the mixer is determined by such a technical solution, if the load ratio of the mixer (that is, the ratio of the maximum flow rate to the minimum flow rate of air or gas) is increased, it will be limited by the pressure regulation accuracy of the zero-pressure valve, and the accuracy of the ratio of air and gas entering the mixer cannot be guaranteed, resulting in poor working adaptability. Summary of the Invention

[0004] The object of the present invention is to provide a mixer and a combustion system with a reasonable design and a simple structure, which can improve the load ratio while ensuring the accuracy of the air-fuel ratio, thereby improving the adaptability of the work.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A mixer for mixing air and gas, comprising: a shell and a piston;

[0007] The housing has a mixing space inside, which is in the shape of a vertically arranged cylinder. An air inlet and a gas inlet are provided on the side wall of the mixing space, so that external air and gas enter the mixing space through the air inlet and the gas inlet respectively.

[0008] The air inlet and the gas inlet are both rectangular in shape extending in the vertical direction, and the center points of the air inlet and the gas inlet are located on the same horizontal plane, and the length of the air inlet in the vertical direction is equal to the length of the gas inlet;

[0009] The outer contour of the piston is cylindrical with a diameter matching that of the mixing space, the piston is arranged in the mixing space to shield the air inlet and the gas inlet, and the piston is movable in the vertical direction in the mixing space to change the shielding area of the air inlet and the gas inlet.

[0010] Preferably, the number of air inlets is more than two.

[0011] Preferably, the device further comprises a door plate and a driving device.

[0012] The door plate is movably connected to the housing at a position corresponding to the gas inlet to shield the gas inlet.

[0013] The driving device is in transmission connection with the door plate and can drive the door plate to move along the circumference of the mixing space to change the shielding area of the door plate to the gas inlet.

[0014] Preferably, the device further comprises a sector-shaped rack and a driving gear.

[0015] The sector-shaped rack is fixedly connected to the door plate, the driving gear is in meshing connection with the sector-shaped rack, the driving device is connected to the driving gear, and the driving device drives the driving gear to rotate to drive the door plate to move through the sector-shaped rack.

[0016] Preferably, the device further comprises an air inlet pipe, an air communication pipe, a mixed gas communication pipe, a deformation component, and a connecting rod.

[0017] One end of the air inlet pipe is fixedly connected to the housing at a position capable of accommodating the air inlet, and the other end is connected to an external air source, so that air in the external air source can flow into the mixing space through the air inlet pipe and the air inlet in sequence.

[0018] The housing further has a driving space inside, the driving space is located above the mixing space, and a partition plate is arranged between the driving space and the mixing space to separate the two, and the partition plate is provided with a through hole.

[0019] The deformation component is arranged in the driving space and separates the driving space into a first space and a second space which are not communicated with each other, the first space is located above the second space, two ends of the air communication pipe are connected with the second space and the air inlet pipe respectively, so that the air in the air inlet pipe can enter the second space, two ends of the mixed gas communication pipe are connected with the mixing space and the first space respectively, so that the mixed gas in the mixing space can enter the first space through the mixed gas communication pipe, and the air entering the second space and the mixed gas entering the first space can jointly drive the deformation component to produce deformation in the vertical direction.

[0020] The connecting rod is arranged in the through hole and is fixedly connected with the deformation component and the piston at two ends respectively, so that the deformation component can drive the piston to move in the vertical direction through the connecting rod when the deformation component produces deformation.

[0021] Preferably, the first elastic component is further included.

[0022] The first elastic component is vertically arranged in the first space, the upper end of the first elastic component is connected to the shell, and the lower end of the first elastic component is connected to the deformation component, so that the elastic component can apply an elastic force to the deformation component in a direction opposite to the deformation direction of the deformation component.

[0023] Preferably, the adjusting screw is further included.

[0024] The adjusting screw hole extending in the vertical direction and matched with the adjusting screw is arranged on the top wall of the first space, the adjusting screw is threadedly connected in the adjusting screw hole, and the upper end of the first elastic component abuts against the adjusting screw.

[0025] Preferably, the sealing component is arranged between the connecting rod and the inner wall of the through hole to seal the gap between the connecting rod and the inner wall of the through hole, the sealing component is fixedly connected with the connecting rod, and the sealing component can deform along with the connecting rod when the connecting rod moves up and down in the through hole.

[0026] Preferably, the second elastic component is further included.

[0027] The second elastic component is vertically arranged in the mixing space, the lower end of the first elastic component is connected to the shell, and the upper end of the first elastic component is connected to the sealing component.

[0028] A combustion system includes the mixer with any of the technical features.

[0029] The mixer of the present application is provided with the piston in the mixing space to shield the air inlet and the gas inlet, the piston can move in the vertical direction in the mixing space to change the shielding area of the air inlet and the gas inlet, the load ratio can be improved under the condition of ensuring the accuracy of air-fuel ratio, the working adaptability is improved, the design is reasonable, the structure is simple and the advantages are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is an embodiment structure schematic view of the mixer of the present application.

[0031] Figure 2 It is an embodiment structure schematic view of the mixer of the present application. Figure 1 It is an embodiment structure schematic view of the mixer of the present application.

[0032] In the figure: 1 - shell; 11 - mixing space; 12 - air inlet; 13 - gas inlet; 14 - door plate; 141 - sector rack; 142 - driving gear; 15 - driving space; 151 - first space; 152 - second space; 153 - adjusting screw hole; 16 - partition plate; 161 - through hole; 2 - piston; 21 - connecting rod; 3 - air inlet pipe; 4 - air communication pipe; 5 - mixed gas communication pipe; 6 - deformation part; 7 - first elastic part; 71 - adjusting stud; 8 - sealing part; 9 - second elastic part. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the mixer and combustion system of the present application are further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0034] Embodiment one

[0035] As Figure 1As shown in the figure, a mixer for mixing air and fuel gas comprises a housing 1 and a piston 2. The housing 1 has a mixing space 11 inside, which is in the shape of a vertically arranged cylinder. An air inlet 12 and a fuel gas inlet 13 are arranged on the side wall of the mixing space 11, so that the external air and fuel gas enter the mixing space 11 through the air inlet 12 and the fuel gas inlet 13 respectively. The air inlet 12 and the fuel gas inlet 13 are both in the shape of a rectangle extending along the vertical direction, and the center points of the air inlet 12 and the fuel gas inlet 13 are located on the same horizontal plane. The length of the air inlet 12 is equal to that of the fuel gas inlet 13 along the vertical direction. The piston 2 is in the shape of a cylinder with a diameter matching that of the mixing space 11. The piston 2 is arranged in the mixing space 11 to shield the air inlet 12 and the fuel gas inlet 13. The piston 2 can move in the vertical direction in the mixing space 11 to change the shielding area of the air inlet 12 and the fuel gas inlet 13. In actual production, the number of air inlets 12 can be more than two.

[0036] Since the air-fuel ratio is determined by the area ratio of the air inlet 12 and the fuel gas inlet 13, and the air inlet 12 and the fuel gas inlet 13 are both in the shape of a rectangle extending along the vertical direction, the area of the air inlet 12 can be expressed as S1=H×B1, and the area of the fuel gas inlet 13 can be expressed as S2=H×B2, where H is the stroke of the piston 2, B1 is the equivalent width of the air inlet 12 (i.e. the width along the circumferential direction of the mixing space 11), and B2 is the equivalent width of the fuel gas inlet 13 (i.e. the width along the circumferential direction of the mixing space 11). The air-fuel ratio β=(K1×B1) / (K2×B2), where K1 and K2 are both constants. Therefore, the air-fuel ratio is independent of the stroke of the piston 2, that is, the air-fuel ratio remains unchanged regardless of the position of the piston 2. Therefore, by using the above technical solution, the piston moves in the vertical direction to change the shielding area of the air inlet 12 and the fuel gas inlet 13, and the air-fuel ratio remains unchanged. Therefore, the load ratio can be improved while ensuring the accuracy of the air-fuel ratio, thereby improving the adaptability of the work.

[0037] The piston 2 can be a pipe segment (the material can be plastic or copper) tightly attached to the inner wall of the mixing space 11. The length of the piston 2 in the vertical direction is, and when the piston 2 moves up to the limit position, the air inlet 12 and the fuel gas inlet 13 are fully opened. When the piston 2 moves down to the limit position, the air inlet 12 and the fuel gas inlet 13 are opened by 1 / 5. Therefore, the adjustment ratio of the mixer can be enlarged by 5 times compared with the mixer in the prior art.

[0038] Further, as shown in the figure, Figure 1As shown, the device further comprises a door plate 14 and a driving device (not shown). The door plate 14 is movably connected to the housing 1 at a position corresponding to the gas inlet 13 to shield the gas inlet 13. The driving device is in transmission connection with the door plate 14 and can drive the door plate 14 to move along the circumference of the mixing space 11 to change the shielding area of the door plate 14 to the gas inlet 13. With the technical scheme, the shielding area of the door plate 14 to the gas inlet 13 can be adjusted to adjust the size of the gas inlet 13 along the circumference of the mixing space, so as to change the amount of gas entering and adjust the air-fuel ratio.

[0039] Further, as shown in Figure 1 , 2 the device further comprises a sector-shaped rack 141 and a driving gear 142. The sector-shaped rack 141 is fixedly connected to the door plate 14, the driving gear 142 is in mesh with the sector-shaped rack 141, the driving device is connected with the driving gear 142, and the driving device drives the driving gear 142 to rotate to drive the door plate 14 to move through the sector-shaped rack 141. At this time, the driving device can be a motor. It should be noted that the driving structure of the driving device to the door plate 14 is not limited to this, and can also be any other way that can achieve the purpose of the application.

[0040] Embodiment Two

[0041] Based on the embodiment one, as shown in Figure 1 the device further comprises an air inlet pipe 3, an air communication pipe 4, a mixed gas communication pipe 5, a deformation component 6 and a connecting rod 21. One end of the air inlet pipe 3 is fixedly connected to the housing 1 at a position capable of accommodating the air inlet, and the other end is connected with an external air source, so that the air in the external air source can flow into the mixing space 11 through the air inlet pipe 3 and the air inlet in sequence. The housing 1 further has a driving space 15 above the mixing space 11, and a partition 16 is arranged between the driving space 15 and the mixing space 11 to separate them. The partition 16 is provided with a through hole 161. The deformation component 6 is arranged in the driving space 15 and separates the driving space 15 into a first space 151 and a second space 152 which are not in communication with each other. The first space 151 is above the second space 152. The two ends of the air communication pipe 4 are respectively connected with the second space 152 and the air inlet pipe 3, so that the air in the air inlet pipe 3 can enter the second space 152. The two ends of the mixed gas communication pipe 5 are respectively connected with the mixing space 11 and the first space 151, so that the mixed gas in the mixing space 11 can enter the first space 151 through the mixed gas communication pipe 5. The air entering the second space 152 and the mixed gas entering the first space 151 can jointly drive the deformation component 6 to deform in the vertical direction. The connecting rod 21 is arranged in the through hole 161 and is fixedly connected with the deformation component 6 and the piston 2 at both ends, so that the deformation component 6 can drive the piston 2 to move in the vertical direction through the connecting rod 21 when the deformation component 6 deforms.

[0042] In actual use, since the air pressure in the second space 152 is equal to the air pressure in the air inlet pipe 3 (equal to the air pressure entering the mixing space 11) and acts on the lower surface of the deformation component 6, and the mixed gas pressure in the first space 151 is equal to the mixed gas pressure in the mixing space 11 and acts on the upper surface of the deformation component 6, since the air pressure in the air inlet pipe 3 is greater than the mixed gas pressure in the mixing space 11, a pressure difference can be formed between the air entering the second space 152 and the mixed gas entering the first space 151, so that the deformation component 6 is deformed towards the first space 151 (upward), at this time the deformation component 6 is deformed upward by driving the piston 2 to move in the vertical direction through the connecting rod 21, so as to improve the load ratio. The deformation component 6 can be a deformation film, but is not limited thereto, and can also be any other component that can achieve the purpose of the application.

[0043] As an implementable manner, as shown in Figure 1 a first elastic component 7 is further arranged vertically in the first space 151, the upper end of the first elastic component 7 is connected to the housing 1, and the lower end of the first elastic component 7 is connected to the deformation component 6, so that the elastic component can apply an elastic force to the deformation component 6 in a direction opposite to the deformation direction of the deformation component 6. In this way, the upward movement distance of the piston 2 can be limited by the first elastic component 7, the accuracy of the movement position of the piston 2 is ensured, and the rationality of the load ratio is ensured. The first elastic component 7 can be a compression spring, but is not limited thereto, and can also be any other component that can achieve the purpose of the application.

[0044] Further, as shown in Figure 1 an adjusting stud 71 is further arranged, the top wall of the first space 151 is provided with an adjusting screw hole 153 extending in the vertical direction and matched with the adjusting stud 71, the adjusting stud 71 is threadedly connected in the adjusting screw hole 153, and the upper end of the first elastic component 7 abuts against the adjusting stud 71. In this way, the elastic force value of the first elastic component 7 applied to the deformation component 6 can be adjusted by the adjusting stud 71, so as to adjust the upward movement stroke of the piston 2.

[0045] As an implementable manner, as shown in Figure 1 a sealing component 8 is arranged between the connecting rod 21 and the inner wall of the through hole 161, so as to seal the gap between the connecting rod 21 and the inner wall of the through hole 161, the sealing component 8 is fixedly connected with the connecting rod 21, and when the connecting rod 21 moves up and down in the through hole 161, the sealing component 8 can deform along with the connecting rod 21. In this way, the mixed gas in the mixing space 11 can be prevented from entering the second space 152 through the gap between the connecting rod 21 and the inner wall of the through hole 161, so as to affect the stroke of the piston 2.

[0046] Further, as shown in Figure 1 The second elastic component 9 is vertically arranged in the mixing space 11, and the lower end of the first elastic component 7 is connected to the shell 1 and the upper end is connected to the sealing component 8. In this way, the second elastic component 9 can overcome the gravity of the connecting rod 21 and the piston 2, and avoid the phenomenon that the deforming component 6 cannot drive the piston 2 to move upward due to the gravity of the connecting rod 21 and the piston 2.

[0047] Embodiment three

[0048] To achieve the purpose of the application, the application further provides a combustion system comprising a mixer, which adopts the same technical solution as the mixture described in the embodiment one or the embodiment two, and thus the structure and working principle thereof will not be described in detail here.

[0049] The above embodiments make the application have the advantages of reasonable design, simple structure, improved load ratio under the condition of ensuring the precision of air-fuel ratio, and improved adaptability.

[0050] The above embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A mixer for mixing air and gas, characterized in that: include: Housing (1) and piston (2); The housing (1) has a mixing space (11) therein, the mixing space (11) being in the shape of a vertically arranged cylinder, and an air inlet (12) and a gas inlet (13) being provided on the side wall of the mixing space (11), so that external air and gas enter the mixing space (11) through the air inlet (12) and the gas inlet (13) respectively; The shapes of the air inlet (12) and the gas inlet (13) are both rectangular and extend in the vertical direction, and the center point of the air inlet (12) and the center point of the gas inlet (13) are located on the same horizontal plane, and the length of the air inlet (12) in the vertical direction is equal to the length of the gas inlet; The outer profile of the piston (2) is cylindrical with a diameter matching the diameter of the mixing space (11). The piston (2) is arranged in the mixing space (11) to block the air inlet (12) and the gas inlet (13). The piston (2) can move in a vertical direction in the mixing space (11) to change the blocking area of ​​the air inlet (12) and the gas inlet (13). It also includes an air intake pipe (3), an air connecting pipe (4), a mixed gas connecting pipe (5), a deformable component (6) and a connecting rod (21); One end of the air intake pipe (3) is fixedly connected to a position on the housing (1) capable of accommodating the air inlet, and the other end is connected to an external air source, so that air in the external air source can flow into the mixing space (11) through the air intake pipe (3) and the air inlet in sequence; The housing (1) further comprises a driving space (15) located above the mixing space (11). A partition (16) is provided between the driving space (15) and the mixing space (11) to separate the two. A through hole (161) is provided on the partition (16). The deformable component (6) is arranged in the driving space (15) and divides the driving space (15) into a first space (151) and a second space (152) which are not connected to each other. The first space (151) is located above the second space (152). The two ends of the air connecting pipe (4) are respectively connected to the second space (152) and the air intake pipe (3), so that the air in the air intake pipe (3) can enter the second space (152). The two ends of the mixed gas connecting pipe (5) are respectively connected to the mixing space (11) and the first space (151), so that the mixed gas in the mixing space can enter the first space (151) through the mixed gas connecting pipe (5). The air entering the second space (152) and the mixed gas entering the first space (151) can jointly drive the deformable component (6) to deform in the vertical direction. The connecting rod (21) is inserted into the through hole (161), and its two ends are fixedly connected to the deformable component (6) and the piston (2) respectively, so that when the deformable component (6) is deformed, the piston (2) can be driven to move in the vertical direction through the connecting rod (21); Also includes a door panel (14) and a driving device; The door panel (14) is movably connected to a position on the housing (1) corresponding to the gas inlet (13) to shield the gas inlet (13); The driving device is in transmission connection with the door panel (14) and is capable of driving the door panel (14) to move circumferentially along the mixing space (11) to change the shielding area of ​​the door panel (14) on the gas inlet (13).

2. The mixer according to claim 1, characterized in that: The number of the air inlets (12) is two or more.

3. The mixer according to claim 1, characterized in that: It also includes a sector rack (141) and a driving gear (142); The sector rack (141) is fixedly connected to the door panel (14), the driving gear (142) is engaged with the sector rack (141), the driving device is connected to the driving gear (142), and the driving device drives the driving gear (142) to rotate, thereby driving the door panel (14) to move through the sector rack (141).

4. The mixer according to claim 1, characterized in that: Also includes a first elastic component (7); The first elastic component (7) is vertically arranged in the first space (151), the upper end of the first elastic component (7) is connected to the shell (1), and the lower end is connected to the deformation component (6), so that the elastic component can apply an elastic force to the deformation component (6) in a direction opposite to the deformation direction of the deformation component (6).

5. The mixer according to claim 4, characterized in that: Also included is an adjustment stud (71); An adjustment screw hole (153) extending in a vertical direction and matching the adjustment screw (71) is provided on the top wall of the first space (151); the adjustment screw (71) is threadedly connected in the adjustment screw hole (153); and the upper end of the first elastic component (7) abuts against the adjustment screw (71).

6. The mixer according to claim 1, characterized in that: A sealing component (8) is provided between the connecting rod (21) and the inner wall of the through hole (161) for sealing the gap between the connecting rod (21) and the inner wall of the through hole (161). The sealing component (8) is fixedly connected to the connecting rod (21). When the connecting rod (21) moves up and down in the through hole (161), the sealing component (8) can deform along with the connecting rod (21).

7. The mixer according to claim 6, characterized in that: Also includes a second elastic component (9); The second elastic component (9) is vertically arranged in the mixing space (11), the lower end of the second elastic component (9) is connected to the shell (1), and the upper end of the second elastic component (9) is connected to the sealing component (8).

8. A combustion system, characterized in that: A mixer comprising the mixer according to any one of claims 1 to 7.

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