Premixing type gas saving burner

Abstract

The invention discloses a premixing type gas saving burner, which relates to the technical field of burners and comprises a combustion chamber, a deformation pipe and a mixing chamber are fixedly mounted on one side of the combustion chamber, two moving plates are slidably mounted in the mixing chamber, one-way air inlet valves are mounted on the two moving plates, and a first breather pipe, a second breather pipe and a third breather pipe are fixedly mounted on the moving plates. The ventilation positions of the first ventilation pipe, the second ventilation pipe and the third ventilation pipe are different. According to the technical scheme, the air inlet amount and the air inlet amount can be controlled through the distance between the two moving plates, it is guaranteed that mixing of combustion gas and air can be matched at any time, adjustment can be completed under the condition that the air speed is not changed by reducing the air inlet amount and the distance between the moving plates, and combustion stability is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and particularly to a premixed type gas-saving burner. Background Art

[0002] A premixed type gas-saving burner is a heat energy conversion device that forms a homogeneous combustible gas by premixing gas and air and then realizes stable combustion through a burner head structure. In the prior art, burners usually adopt a structural design of independently adjusting a gas valve and an air valve, and control the input amounts of gas and air through mechanical linkage or step-by-step adjustment methods. Under the regulation of a gas / air ratio valve, the theoretical air-fuel ratio is maintained. At the same time, a porous medium or a swirl structure is provided at the burner head to stabilize the flame shape. However, this technical solution has significant defects: when adjusting the flame intensity, due to the time sequence difference and response speed difference in the adjustment of the gas and air flow rates, non-linear fluctuations occur in the instantaneous wind speed and flame shape during the load change process. Specifically, it is manifested as a risk of flashback caused by a sudden drop in the air flow speed under low-load conditions, and phenomena such as flame detachment from the combustion surface or even flameout due to a sharp increase in the flow rate during large-load switching. This sudden change in the wind speed during the dynamic adjustment process not only reduces the combustion thermal efficiency, but also causes secondary problems such as a sharp increase in nitrogen oxide emissions and combustion oscillation, seriously restricting the adjustment accuracy and safety performance of the burner. Summary of the Invention

[0003] To solve the above technical problems, the present invention discloses a premixed type gas-saving burner, which includes a combustion chamber. A deformation tube and a mixing chamber are fixedly installed at one side of the combustion chamber. Two moving plates are slidably installed in the mixing chamber. One-way intake valves are installed on both of the two moving plates. Vent pipes one, two, and three are fixedly installed on the moving plates, and the ventilation positions on the vent pipes one, two, and three are different. Through the above technical solution, the distance between the two moving plates can control the intake amount and the amount of air entering, ensuring that the mixing of the combustion gas and air can be matched at any time. And by reducing the intake amount and the distance between the moving plates, it is possible to complete the adjustment without changing the wind speed, ensuring the stability of combustion.

[0004] Further, the ventilation hole of the vent pipe one is located near the moving plate, the ventilation hole of the vent pipe two is located in the middle position, and the ventilation hole of the vent pipe three is located at the end. One-way intake valves are provided on the moving plates, and the one-way intake valves allow air to flow from the outside to between the two moving plates. Through the above technical solution, the air holes at different positions on the vent pipes one, two, and three can change when the distance between the two moving plates changes. When the distance between the two moving plates is relatively close, the intake amount will decrease accordingly.

[0005] Further, a tail pipe is installed at the bottom of the deformation tube, and a fan is installed in the tail pipe.

[0006] Furthermore, the fan includes a rotating wheel, a fan blade sleeve is fixedly installed at the edge of the rotating wheel, a fan blade is slidably installed in the fan blade sleeve, and a compression spring is fixedly installed between the fan blade and the fan blade sleeve.

[0007] Furthermore, one side of the tail pipe is fixedly installed with a pipe head, an inclined inner groove is formed between the tail pipe and the pipe head, the inner side of the inclined inner groove is an inclined surface, and a mating ball is fixedly installed at the end of the fan blade, and the mating ball is attached to the inner side of the inclined inner groove. Through the above technical solution, when the distance between the two moving plates changes, the second end of the driving rod will drive the moving plate to approach the inclined inner groove, the inclined inner groove squeezes the mating ball, and the mating ball will drive the fan blade to retract. The fan blade of the fan becomes shorter and the air intake will also decrease, so the gas will also decrease, but the wind speed remains unchanged.

[0008] Furthermore, a driving rod is hinged to the lower side of the deformable pipe, the first end of the driving rod is attached to the moving plate, and the second end of the driving rod is equipped with a fan.

[0009] Furthermore, a connecting groove is provided at the second end of the moving plate, a connecting shaft is fixedly installed at the end of the connecting groove, a mating long rod is fitted on the connecting shafts of the two driving rods, a fan is installed on the mating long rod, and when the two moving plates approach, the connecting shaft drives the chute to approach the inclined inner groove.

[0010] Furthermore, a rotating motor is fixedly installed on the mating long rod, the rotating shaft of the rotating motor passes through the mating long rod, and the rotating wheel is rotatably installed on the moving plate, and the rotating motor drives the rotating wheel to rotate.

[0011] Furthermore, a combustion chamber is fixedly installed at one end of the deformable pipe, a wind blocking plate is fixedly installed inside the combustion chamber, the wind blocking plate is located at the gap position facing the moving plate, and a transmission fan blade is installed on the wind blocking plate. Through the above technical solution, the air and gas between the two moving plates are mixed and directly blown into the combustion chamber, and are blocked by the wind blocking plate to avoid directly blowing to the end of the combustion chamber for combustion, and the transmission fan blades are driven to rotate around the wind blocking plate for further mixing.

[0012] The beneficial effects of the present invention compared with the prior art are: (1) Through the technical solution of the present invention, the distance between the two moving plates can control the air intake and the amount of air entering, ensuring that the mixture of combustion gas and air can be matched at any time, and by reducing the air intake and the distance between the moving plates, the adjustment can be completed without changing the wind speed, ensuring the stability of combustion.

[0013] (2) Through the technical solution of the present invention, the air holes at different positions on the first vent pipe, the second vent pipe, and the third vent pipe can be changed when the distance between the two moving plates changes. When the two moving plates are relatively close, the air intake will decrease accordingly.

[0014] (3) Through the technical solution of the present invention, when the distance between the two moving plates changes, the second end of the driving rod will drive the moving plate to approach the inclined inner groove. The inclined inner groove squeezes the mating ball, and the mating ball will drive the fan blade to retract. The length of the fan blade of the fan becomes shorter and the air intake volume decreases, so the fuel gas will also decrease, but the wind speed remains unchanged.

[0015] (4) Through the technical solution of the present invention, the air and fuel gas between the two moving plates are mixed and directly blown into the combustion chamber. The air is blocked by the wind blocking plate to prevent direct combustion at the end of the combustion chamber, and the transmission fan blade is driven to rotate around the wind blocking plate for further mixing. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0017] Figure 2 It is a side view of an embodiment of the present invention.

[0018] Figure 3 It is Figure 2 The cross-sectional view taken along line B-B in

[0019] Figure 4 It is an internal cross-sectional view of an embodiment of the present invention.

[0020] Figure 5 It is Figure 4 The enlarged schematic view at position A in

[0021] Figure 6 It is a schematic diagram of the partial structure of an embodiment of the present invention.

[0022] Figure 7 It is a schematic diagram of the fan blade of an embodiment of the present invention.

[0023] Reference numerals in the drawings: 1 - Combustion chamber; 2 - Deformed pipe; 3 - Adjusting rod; 4 - Mixing chamber; 5 - First ventilation pipe; 6 - Second ventilation pipe; 7 - Third ventilation pipe; 8 - Tail pipe; 9 - Pipe head; 10 - Moving plate; 11 - Driving rod; 12 - Connecting lug; 13 - Torsion spring; 14 - Rotation pin; 15 - Rotation wheel; 16 - Rotation motor; 17 - Connecting shaft; 18 - Mounting table; 19 - Matching roller; 20 - Matching long rod; 21 - Chute; 22 - Fan blade sleeve; 23 - Fan blade; 24 - Matching ball; 25 - Inclined inner groove; 26 - Connecting groove; 27 - Compression spring; 28 - Wind blocking plate; 29 - Transmission fan blade; 30 - One-way intake valve. Detailed Embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1-7 shown, a premixed type gas-saving burner includes a combustion chamber 1. A deformation tube 2 and a mixing chamber 4 are fixedly installed at one side of the combustion chamber 1. Two moving plates 10 are slidably installed in the mixing chamber 4. An adjusting rod 3 is fixedly installed on the moving plate 10. The adjusting rod 3 is slidably connected to the mixing chamber 4. One-way intake valves 30 are installed on both of the two moving plates 10. A first air pipe 5, a second air pipe 6, and a third air pipe 7 are fixedly installed on the moving plate 10. The air vent positions on the first air pipe 5, the second air pipe 6, and the third air pipe 7 are different. Air and gas are fully fused between the two moving plates 10. The first air pipe 5, the second air pipe 6, and the third air pipe 7 are used for air intake. One end of the adjusting rod 3 is provided with a tail pipe 8 and a pipe head 9. Gas enters from the positions of the tail pipe 8 and the pipe head 9 and is preliminarily fused between the two moving plates 10. The combustion chamber 1 is cast from a high-temperature resistant alloy. Its front end is connected to the deformation pipe 2 through a flange. The deformation pipe 2 adopts a corrugated telescopic structure to absorb thermal expansion stress. The mixing chamber 4 is fixed at the inlet end of the deformation pipe 2 by bolts. A double-rail system is precisely machined inside it. Two moving plates 10 achieve high-precision sliding fit with the rails through linear bearings. The moving plate 10 is made of a hollow stainless steel plate body. Honeycomb-shaped flow guiding structures are formed by laser drilling on its surface. Three-stage air intake channels, namely the air pipe one 5, the air pipe two 6, and the air pipe three 7, are integrated inside the plate body. Each air pipe adopts a stepped aperture design: the conical spray holes of the air pipe one 5 are arranged in a circular array along the proximal end of the plate body. The rectangular slits (width 2 mm × length 15 mm) of the air pipe two 6 are located in the middle of the plate body. The circular diffusion holes of the air pipe three 7 are distributed at the distal end of the plate body. When the adjusting rod 3 is pushed, the displacement of the moving plate 10 is fed back to the control system in real time through a Hall sensor to form a closed-loop adjustment. During the process of adjusting the distance between the moving plates 10, a dynamic gradient air supply mechanism is formed by the three-stage air pipes. When the distance between the two plates is the largest, the air holes of the air pipe one 5 are completely exposed outside the mixing chamber 4. At this time, air generates a high-speed jet through 0.5 mm micro holes and forms a strong shear mixing with the fuel gas input from the tail pipe 8. When the adjusting rod 3 is pushed inwards to 50% of the stroke, the air holes of the air pipe one 5 completely enter the inner wall of the mixing chamber 4, and the rectangular slits of the air pipe two 6 are opened. Its long strip-shaped opening enables the air to form a laminar wall attachment effect, and the flow velocity is stable at 12 m / s. When adjusted to the minimum distance, only the diffusion holes of the air pipe three 7 work. Its flared outlet reduces the air flow velocity to 5 m / s but increases the turbulence intensity to 40%, and maintains the mixing uniformity through a velocity-turbulence compensation mechanism. The one-way intake valve 30 adopts a silicone diaphragm structure and automatically opens for air supplement when the pressure between the plates is 0.2 kPa lower than the external air pressure to prevent the fuel gas from flowing back due to negative pressure back suction. Through the above technical solutions, the distance between the two moving plates 10 can control the intake air volume and the amount of air entering, ensure that the mixing of the combustion gas and air can be matched at any time, and meet the adjustment without changing the wind speed by reducing the intake air volume and the distance between the moving plates 10, and ensure the stability of combustion.

[0026] In this embodiment, the ventilation holes of the first ventilation pipe 5 are located near the moving plate 10, the ventilation holes of the second ventilation pipe 6 are located in the middle position, and the ventilation holes of the third ventilation pipe 7 are located at the end. A one-way intake valve 30 is provided on the moving plate 10, and the one-way intake valve 30 allows air to flow from the outside to between the two moving plates 10. Openings are provided at the positions where the first ventilation pipe 5, the second ventilation pipe 6, and the third ventilation pipe 7 contact the moving plate 10, and they are all hollow inside. When the distance between the two moving plates 10 is the largest, the openings on the first ventilation pipe 5, the second ventilation pipe 6, and the third ventilation pipe 7 are all outside the mixing chamber 4. As the two moving plates 10 gradually approach, the air holes on the first ventilation pipe 5 completely enter the mixing chamber 4, and then the air holes on the second ventilation pipe 6 completely enter the mixing chamber 4. Finally, only the air holes of the third ventilation pipe 7 are exposed outside to supply air. Through the above technical solution, the air holes at different positions on the first ventilation pipe 5, the second ventilation pipe 6, and the third ventilation pipe 7 can change when the distance between the two moving plates 10 changes. When the distance between the two moving plates 10 is relatively close, the intake air volume will decrease accordingly.

[0027] In this embodiment, a tail pipe 8 is installed at the bottom of the deformable pipe 2, and a fan is installed inside the tail pipe 8. The fan blows the fuel gas between the two moving plates 10. The fan includes a rotating wheel 15, a fan blade sleeve 22 is fixedly installed on the edge of the rotating wheel 15, a fan blade 23 is slidably installed inside the fan blade sleeve 22, and a compression spring 27 is fixedly installed between the fan blade 23 and the fan blade sleeve 22.

[0028] In this embodiment, a pipe head 9 is fixedly installed on one side of the tail pipe 8. An inclined inner groove 25 is provided between the pipe head 9 and the tail pipe 8. The inside of the inclined inner groove 25 is all inclined surfaces. A mating ball 24 is fixedly installed at the end of the fan blade 23, and the mating ball 24 fits with the inner side of the inclined inner groove 25. Through the above technical solution, when the distance between the two moving plates 10 changes, the second end of the driving rod 11 will drive the moving plate 10 to approach the inclined inner groove 25. The inclined inner groove 25 squeezes the mating ball 24, and the mating ball 24 will drive the fan blade 23 to retract. The fan blades of the fan become shorter and the intake air volume will also decrease. In this way, the fuel gas will also decrease, but the wind speed remains unchanged.

[0029] In this embodiment, a driving rod 11 is hinged to the lower side of the deformable pipe 2. The first end of the driving rod 11 is in contact with the moving plate 10. Specifically, a mating roller 19 is rotatably installed at one end of the driving rod 11, and the mating roller 19 fits with the inner side of the moving plate 10. When the two moving plates 10 move, the mating roller 19 always fits with the moving plate 10 and rolls on the moving plate 10. Thus, the driving rod 11 will be driven to rotate. When the driving rod 11 rotates, the second end will move. The second end of the driving rod 11 is provided with a fan.

[0030] In this embodiment, a connection groove 26 is provided at the second end of the moving plate 10. A connection shaft 17 is fixedly installed at the end of the connection groove 26. A mating long rod 20 is fitted on the connection shafts 17 of the two driving rods 11. The inside of the mating long rod 20 is a sliding groove 21. The two connection shafts 17 are located in the sliding groove 21. When the two driving rods 11 rotate simultaneously, the mating long rod 20 can be driven to move up and down synchronously on both sides through the connection shafts 17. A fan is installed on the mating long rod 20. When the two moving plates 10 approach each other, the sliding groove 21 is driven to approach the inclined inner groove 25 through the connection shafts 17.

[0031] In this embodiment, a rotating motor 16 is fixedly installed on the mating long rod 20. The rotating shaft of the rotating motor 16 passes through the mating long rod 20. An installation platform 18 is fixedly installed on the mating long rod 20. A rotating wheel 15 is rotatably installed on the installation platform 18. The rotating motor 16 drives the rotating wheel 15 to rotate. The rotating wheel 15 in the tail pipe 8 is connected to the rotating motor 16 through a precision gear set. The fan blade sleeve 22 at its edge is made of tungsten steel. The internal fan blade 23 forms a friction pair with the compression spring 27 through a nano-ceramic coating. When the moving plate 10 is displaced, the mating roller 19 at the end of the driving rod 11 rolls along the curved surface of the plate body. The linear displacement is converted into a 23° rotation angle of the driving rod 11 through a four-bar linkage mechanism. The rotation of the driving rod 11 drives the mating long rod 20 to translate along the sliding groove 21 through the connection shaft 17. At this time, the 45° wedge surface of the inclined inner groove 25 radially compresses the mating ball 24 by 0.8 - 3.2 mm, so that the fan blade 23 generates length adjustment under the balance of centrifugal force and spring force.

[0032] In this embodiment, a combustion chamber 1 is fixedly installed at one end of the deformation tube 2. A wind blocking plate 28 is fixedly installed inside the combustion chamber 1. The wind blocking plate 28 is located at the gap position facing the moving plate 10. A transmission fan blade 29 is installed on the wind blocking plate 28. Through the above technical solution, the air and gas between the two moving plates 10 are mixed and directly blown into the combustion chamber 1. The blowing is blocked by the wind blocking plate 28 to prevent direct combustion at the end of the combustion chamber 1. And the transmission fan blade 29 is driven to rotate around the periphery of the wind blocking plate 28 for further mixing.

[0033] Working principle: During operation, if the intake air volume needs to be adjusted, slide the adjusting rod 3. The adjusting rod 3 will drive the moving plate 10 to move. For example, to reduce the flame intensity, push the two moving plates 10 closer to each other. At this time, the ventilation holes of the first ventilation pipe 5 completely enter the mixing chamber 4, and the incoming air only enters through the second ventilation pipe 6 and the third ventilation pipe 7 and reaches the space between the mixing chamber 4 and the moving plate 10. The space between the mixing chamber 4 and the moving plate 10 becomes larger, and air will also be instantaneously inhaled. Finally, it enters between the two moving plates 10 from the position of the one-way intake valve 30. When the two moving plates 10 move closer to each other, they will drive the driving rod 11 to rotate. The driving rod 11 drives the cooperating long rod 20 to approach the inclined inner groove 25, driving the cooperating ball 24 to slide on the inclined inner groove 25 and be squeezed, and the fan blade 23 retracts, which is equivalent to reducing the fan blade. At a constant rotational speed, the amount of gas entering decreases. By spraying, it is possible to adjust the intake air volume without changing the intake air speed, and it is also possible to only change the intake air speed without changing the intake air volume, thereby adjusting the state of the flame. The gas and air are mixed between the two moving plates 10 and then blown onto the air damper plate 28, spreading from all around to drive the transmission fan blade 29 to rotate, thereby achieving further mixing.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A premixed type gas-saving burner, characterized in that, It includes a combustion chamber (1), a fixed deformation tube (2) and a mixing chamber (4) are installed in the combustion chamber (1), two moving plates (10) are slidably installed in the mixing chamber (4), one-way intake valves (30) are installed on both of the two moving plates (10), a first ventilation pipe (5), a second ventilation pipe (6) and a third ventilation pipe (7) are fixedly installed on the moving plates (10), and the ventilation positions on the first ventilation pipe (5), the second ventilation pipe (6) and the third ventilation pipe (7) are different.

2. The premixed type gas-saving burner according to claim 1, characterized in that, The ventilation hole of the first ventilation pipe (5) is located near the moving plate (10), the ventilation hole of the second ventilation pipe (6) is located at the middle position, the ventilation hole of the third ventilation pipe (7) is located at the end, a one-way intake valve (30) is arranged on the moving plate (10), and the one-way intake valve (30) allows air to flow from the outside between the two moving plates (10).

3. The premixed type gas-saving burner according to claim 2, characterized in that, A tail pipe (8) is installed at the bottom of the deformation tube (2), and a fan is installed in the tail pipe (8).

4. A premixed type gas-saving burner according to claim 3, characterized in that, The fan includes a rotating wheel (15), a fan blade sleeve (22) is fixedly installed on the edge of the rotating wheel (15), fan blades (23) are slidably installed in the fan blade sleeve (22), and a compression spring (27) is fixedly installed between the fan blades (23) and the fan blade sleeve (22).

5. A premixed type gas-saving burner according to claim 4, characterized in that, A pipe head (9) is fixedly installed on one side of the tail pipe (8), an inclined inner groove (25) is formed between the tail pipe (8) and the pipe head (9), the inner side of the inclined inner groove (25) is an inclined surface, a matching ball (24) is fixedly installed at the end of the fan blade (23), and the matching ball (24) is attached to the inner side of the inclined inner groove (25).

6. The premixed type throttle burner according to claim 5, characterized in that, A driving rod (11) is hinged to the lower side of the deformation tube (2), the first end of the driving rod (11) is attached to the moving plate (10), and the second end of the driving rod (11) is equipped with a fan.

7. A premixed type throttle burner according to claim 6, characterized in that, A connection groove (26) is arranged at the second end of the moving plate (10), a connection shaft (17) is fixedly installed at the end of the connection groove (26), a matching long rod (20) is fitted on the connection shafts (17) of the two driving rods (11), a fan is installed on the matching long rod (20), and when the two moving plates (10) approach, the chute (21) is driven to approach the inclined inner groove (25) through the connection shaft (17).

8. A premixed type throttle burner according to claim 7, characterized in that, A rotating motor (16) is fixedly installed on the matching long rod (20), the rotating shaft of the rotating motor (16) passes through the matching long rod (20), the rotating wheel (15) is rotatably installed on the moving plate (10), and the rotating motor (16) drives the rotating wheel (15) to rotate.

9. The premixed type gas-saving burner according to claim 8, wherein One end of the deformation tube (2) is fixedly installed with a combustion chamber (1), a wind blocking plate (28) is fixedly installed inside the combustion chamber (1), the wind blocking plate (28) is located at the gap position facing the moving plate (10), and a transmission fan blade (29) is installed on the wind blocking plate (28).

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