Boiler gas mixing air supply device

Abstract

The invention relates to a boiler gas mixing and blowing device which comprises a blower, a blowing pipe, a filter screen, a gas delivery pipe, a mixing chamber and a combustion chamber which are connected in sequence. An outlet of the fuel gas supply pipe is connected with the gas conveying pipe; a brush further abuts against the filter screen; the filter screen rotates through the motor under the action of the transmission assembly, so that the position, connected with the air conveying pipe and the air supply pipe, of the filter screen is changed, and the filter screen moves relative to the brush. An axially-arranged moving plate is installed in the gas conveying pipe, one side of the moving plate vertically extends out of an adjusting plate, the adjusting plate is arranged at an outlet of the fuel gas conveying pipe, and the communicating area of the fuel gas conveying pipe and the gas conveying pipe is adjusted through movement of the adjusting plate; when the output air pressure of the air feeder is increased, the farther the moving distance of the adjusting plate is, the larger the communication area of the fuel air feeding pipe and the air conveying pipe is, and the larger the flow of fuel gas entering the air conveying pipe is. Therefore, the flow of the fuel gas is automatically adjusted along with the flow change of the air flow.

Description

Technical Field

[0001] The invention relates to the technical field of industrial boilers, in particular to a boiler gas mixing air supply device. Background Art

[0002] Industrial boilers generally use methane as fuel, which requires sufficient air to burn fully, so blowers are generally used to supply air.

[0003] Since impurities in the air will block the blower and affect the normal operation of the blower, the air flow output by the blower will be filtered through the filter. As impurities in the air accumulate on the filter, the filter will be blocked by impurities, affecting the air flow and thus the combustion efficiency; at the same time, the current air supply device cannot automatically adjust the methane flow according to the air flow, and needs to adjust the methane flow separately, which is complicated to operate. Summary of the invention

[0004] In order to solve the technical problems in the background technology, the present invention discloses a boiler gas mixing air supply device.

[0005] The present invention provides a boiler gas mixing air supply device, comprising:

[0006] Blower;

[0007] an air supply duct, the inlet of which is connected to the outlet of the air supply fan;

[0008] A filter screen, one side of which is connected to the outlet of the air supply pipe;

[0009] The gas delivery pipe is coaxial with the air supply pipe, and its inlet is connected to the other side of the filter;

[0010] a mixing chamber, the inlet of which is connected to the outlet of the gas transmission pipe;

[0011] a combustion chamber, the inlet of which is connected to the outlet of the mixing chamber;

[0012] A fuel air delivery pipe, the outlet of which is connected to the air delivery pipe;

[0013] The brush is arranged staggered with the air supply pipe, and its bristles are against the filter screen;

[0014] The filter screen rotates under the action of the transmission assembly through the motor, thereby changing the position of the filter screen connecting the air pipe and the air supply pipe, and generating relative movement with the brush;

[0015] An axially arranged moving plate is installed in the gas delivery pipe, and an adjusting plate is vertically extended from one side of the moving plate. The adjusting plate is arranged at the outlet of the fuel gas delivery pipe, and the connecting area between the fuel gas delivery pipe and the gas delivery pipe is adjusted by moving the adjusting plate;

[0016] The regulating plate is away from the fuel air supply pipe, so that the power for increasing the communicating area between the fuel air supply pipe and the air delivery pipe comes from the air pressure generated by the blower.

[0017] The beneficial effects of the above arrangement are as follows: 1. The air flow generated by the blower enters the air supply pipe and enters the air delivery pipe under the action of the filter; air pressure is generated in the air delivery pipe, and the movable plate is driven away from the fuel air supply pipe, so that the fuel air supply pipe is connected with the air delivery pipe, and the fuel gas in the fuel air supply pipe enters the air delivery pipe, and enters the mixing chamber together with the air in the air delivery pipe for mixing, and then enters the combustion chamber for full combustion; when the output air pressure of the blower increases, the farther the movable plate moves, the larger the connecting area between the fuel air supply pipe and the air delivery pipe, and the larger the flow rate of the fuel gas entering the air delivery pipe; in this way, the flow rate of the fuel gas is automatically adjusted following the flow rate change of the air flow; 2. When there are too many impurities on the filter, the motor drives the filter to rotate a certain angle, so that the air delivery pipe and the air supply pipe are connected to other areas of the filter that do not adsorb impurities, so that the device can quickly restore its performance without the process of replacing the filter; 3. When the area of ​​the filter adsorbing impurities rotates to the brush, the impurities on the filter can be scraped off by its relative movement. Thus, the filter screen rotates, so that the device can be operated continuously, stably and for a long time.

[0018] The transmission assembly specifically includes: a rotating shaft, one end of which is fixedly connected to the center position of the filter screen, and the other end is rotatably connected to the fixed plate; a first bevel gear is fixedly connected to the rotating shaft; the first bevel gear is meshed with a second bevel gear; the second bevel gear is connected to a worm gear through a connecting shaft; the worm gear is meshed with a worm; the driving end of the motor is fixedly connected to the worm gear.

[0019] Since there is only one conventional fuel air supply pipe, the mixing efficiency with air in the air supply pipe is low. Based on this, a further improvement is that four fuel air supply pipes are provided, which are arranged rotationally symmetrically with respect to the air supply pipe.

[0020] The specific installation structure of the movable plate is as follows: a fixed ring is arranged in the gas pipe; a limiting ring is axially extended from the side of the inner ring of the fixed ring close to the fuel gas pipe; the movable plate is inserted between the limiting ring and the inner wall of the gas pipe; sealing rings are clamped on the inner and outer walls of the movable plate, and are sealed with the limiting ring and the gas pipe; a spring is connected between the movable plate and the fixed ring.

[0021] The moving plate, the outer wall of the limiting ring, the fixed ring and the inner wall of the gas pipe form a moving cavity. If the moving cavity is sealed, when the moving plate moves toward the fixed ring, the air pressure in the moving cavity will increase, resulting in an increase in the resistance to the movement of the moving plate, which reduces the flow of fuel gas and does not meet the use requirements. Based on this, a further improvement is that an air hole is opened on the gas pipe to communicate with the moving cavity. With this arrangement, the air pressure in the moving cavity remains stable and does not increase the resistance to the movement of the moving plate.

[0022] In order to improve the stability of spring deformation, a further design is: a sleeve extending toward the movable plate is vertically connected to the fixed ring; a positioning rod inserted into the sleeve is vertically connected to the movable plate; the spring is sleeved on the positioning rod, one end of which abuts against the movable plate and the other end abuts against the end of the sleeve; the elastic force of the spring drives the movable plate away from the fixed ring.

[0023] The degree of mixing of the fuel gas and air entering the combustion chamber directly affects the degree of combustion. Based on this, further improvements are: a rotatably connected impeller is arranged in the mixing chamber; a plurality of rotationally symmetrical arc blades are arranged on the side of the impeller; the inlet of the mixing chamber is opposite to the blades, so that the airflow entering the mixing chamber can drive the impeller to rotate.

[0024] The beneficial effects of the present invention are as follows: 1. The air flow generated by the blower enters the air supply pipe and enters the air delivery pipe under the action of the filter; air pressure is generated in the air delivery pipe, and the regulating plate is driven away from the fuel air supply pipe, so that the fuel air supply pipe is connected with the air delivery pipe, and the fuel gas in the fuel air supply pipe enters the air delivery pipe, and enters the mixing chamber together with the air in the air delivery pipe for mixing, and then enters the combustion chamber for full combustion; when the output air pressure of the blower increases, the farther the regulating plate moves, the larger the connecting area of ​​the fuel air supply pipe and the air delivery pipe is, and the larger the flow rate of the fuel gas entering the air delivery pipe is; in this way, the flow rate of the fuel gas is automatically adjusted following the flow rate change of the air flow; 2. When there are too many impurities on the filter, the motor drives the filter to rotate a certain angle, so that the air delivery pipe and the air supply pipe are connected to other areas of the filter that do not adsorb impurities, so that the performance of the device can be quickly restored without the process of replacing the filter; 3. When the area of ​​the filter adsorbing impurities rotates to the brush, the impurities on the filter can be scraped off by its relative movement. Thus, the filter screen rotates, so that the device can be operated continuously, stably and for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0028] Figure 3 It is a front view of the present invention;

[0029] Figure 4 is a top view of the present invention;

[0030] Figure 5 yes Figure 4 Cross-sectional view of the middle BB;

[0031] Figure 6 This is an enlarged view of point D in 5;

[0032] Figure 7 yes Figure 4 Cross-sectional view of CC;

[0033] Figure 8 Schematic diagram of the installation structure of the runner;

[0034] In the figure: 1. blower; 2. air supply pipe; 3. filter; 4. air supply pipe; 5. mixing chamber; 6. fuel air supply pipe; 7. brush; 8. motor; 9. rotating shaft; 10. fixing plate; 11. first bevel gear; 12. second bevel gear; 13. connecting shaft; 14. worm gear; 15. worm; 16. fixing ring; 17. limiting ring; 18. sealing ring; 19. spring; 20. moving chamber; 21. air hole; 22. sleeve; 23. positioning rod; 24. combustion chamber; 25. runner; 26. blades; 27. base; 28. moving plate; 29. ​​adjusting plate. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] like Figure 1-4 As shown, the present invention discloses a boiler gas mixing air supply device, including a base 27, on which a blower 1 is arranged, whose air outlet is arranged horizontally, and is sequentially connected with an air supply pipe 2, a filter screen 3, a gas delivery pipe 4, a mixing chamber 5 and a combustion chamber 24. The gas delivery pipe 4 is vertically connected with a fuel gas delivery pipe 6, and the fuel gas enters the gas delivery pipe 4 from the fuel gas delivery pipe 6.

[0037] The filter screen 3 is circular and arranged vertically, and a coaxially arranged rotating shaft 9 is connected to the center thereof. A circular ring is connected to the edge of the filter screen 3 to improve the structural stability of the filter screen 3. The outlet of the air supply pipe 2 abuts against the upper area of ​​one side of the filter screen 3, located between the rotating shaft 9 and the edge of the filter screen 3, and the connection is sealed by a sealing gasket. The inlet of the air supply pipe 4 abuts against the other side of the filter screen 3 and is coaxial with the air supply pipe 2. The connection between the air supply pipe 4 and the filter screen 3 is also sealed by a sealing gasket.

[0038] A vertically arranged fixing plate 10 is provided on the base 27, and a bearing is clamped on the fixing plate 10. The outer end of the rotating shaft 9 is inserted into the bearing to realize a rotational connection. A coaxially arranged first bevel gear 11 is fixedly connected to the rotating shaft 9; the first bevel gear 11 is vertically meshed with the second bevel gear 12; the second bevel gear 12 is connected to the worm gear 14 through the connecting shaft 13; the worm gear 14 is meshed with the horizontally arranged worm 15; the driving end of the motor 8 is fixedly connected to the worm 15. When the motor 8 is started, the filter 3 can be driven to rotate. In this arrangement, when there are too many impurities on the filter 3, the motor 8 drives the filter 3 to rotate a certain angle, so that the air supply pipe 4 and the air supply pipe 2 are connected to other areas of the filter 3 that do not adsorb impurities, so that the performance of the device can be quickly restored without the process of replacing the filter 3.

[0039] A vertically arranged brush 7 is also provided on the base 27. Since the filter screen only absorbs impurities on the side connected to the air supply pipe 2, the brush 7 and the air supply pipe 2 are located on the same side of the filter screen 3. The bristles on the brush 7 abut against the lower area of ​​the filter screen 3. When the filter screen 3 rotates, it rotates relative to the brush 7. When the area of ​​the filter screen 3 where impurities are absorbed rotates to the brush 7, the impurities on the filter screen 3 can be scraped off by the relative movement thereof. Thus, by rotating the filter screen 3, the device can be operated continuously, stably and for a long time.

[0040] like Figure 5 and Figure 6 As shown, a fixed ring 16 and a movable plate 28 are provided in the gas delivery pipe 4. A limiting ring 17 is axially extended from the inner ring of the fixed ring 16 near the fuel gas delivery pipe 6. The movable plate 28 is annular and inserted between the limiting ring 17 and the inner wall of the gas delivery pipe 4. The inner and outer walls of the movable plate 28 are both clamped with a sealing ring 18 to achieve a sealed connection. An adjusting plate 29 is vertically extended from one side of the movable plate 28. The adjusting plate 29 is arranged at the outlet of the fuel gas delivery pipe 6. By moving the adjusting plate 29, the connection area between the fuel gas delivery pipe 6 and the gas delivery pipe 4 is adjusted.

[0041] The fixed ring 16 is vertically connected with a sleeve 22 extending toward the moving plate 28; the moving plate 28 is vertically connected with a positioning rod 23 inserted into the sleeve 22; the spring 19 sleeves the positioning rod 23, one end of which abuts against the moving plate 28, and the other end abuts against the end of the sleeve 22; the elastic force of the spring 19 drives the moving plate 28 away from the fixed ring 16. Therefore, when the blower 1 is in the shutdown state, the regulating plate 29 blocks the outlet of the fuel air supply pipe 6.

[0042] When the airflow generated by the blower 1 enters the gas pipe 4, its air pressure drives the movable plate 28 to approach the fixed ring 16, and drives the regulating plate 29 away from the fuel gas pipe 6, so that the fuel gas pipe 6 is connected with the gas pipe 4, and the fuel gas enters the gas pipe 4. When the output pressure of the blower 1 increases, the air pressure in the gas pipe 4 increases, and the farther the regulating plate 29 moves, the larger the connecting area between the fuel gas pipe 6 and the gas pipe 4, and the larger the flow rate of the fuel gas entering the gas pipe 4; in this way, the flow rate of the fuel gas is automatically adjusted following the flow rate change of the air flow.

[0043] The movable plate 28, the outer wall of the limiting ring 17, the fixed ring 16 and the inner wall of the gas pipe 4 form a movable cavity 20. If the movable cavity 20 is sealed, when the movable plate 28 moves toward the fixed ring 16, the air pressure in the movable cavity 20 will increase, resulting in an increase in the resistance to the movement of the movable plate 28, which reduces the flow of the fuel gas and does not meet the use requirements. Therefore, an air hole 21 is provided on the gas pipe 4 to communicate with the movable cavity 20. In this way, the air pressure in the movable cavity 20 remains stable and does not increase the resistance to the movement of the movable plate 28.

[0044] In this embodiment, four fuel gas delivery pipes 6 are provided, which are arranged rotationally symmetrically with respect to the gas delivery pipe 4. With such an arrangement, the fuel gas enters the gas delivery pipe 4 from four directions at the same time, which can improve the mixing uniformity of the fuel gas and the air in the gas delivery pipe 4, so that the fuel gas burns more fully in the combustion chamber 24.

[0045] like Figure 7 and Figure 8 As shown, a rotating wheel 25 is provided in the mixing chamber 5; a plurality of rotationally symmetrical arc blades 26 are provided on the side of the wheel 25, with the concave surface facing outward; the inlet of the mixing chamber 5 faces the blades 26, so that the airflow entering the mixing chamber 5 can drive the wheel 25 to rotate. In this way, the fuel gas and the air are further mixed in the mixing chamber 5 to improve the uniformity of the mixing and improve the combustion efficiency of the fuel gas in the combustion chamber 24.

[0046] The working principle of this embodiment is as follows: the air flow generated by the blower 1 enters the air supply pipe 2, and enters the air supply pipe 4 under the filtering action of the filter 3; air pressure is generated in the air supply pipe 4, and the regulating plate 29 is driven away from the fuel air supply pipe 6, so that the fuel air supply pipe 6 is connected with the air supply pipe 4, and the fuel gas in the fuel air supply pipe 6 enters the air supply pipe 4, and enters the mixing chamber 5 together with the air in the air supply pipe 4 for mixing, and then enters the combustion chamber 24 for full combustion; when the output air pressure of the blower 1 increases, the farther the regulating plate 29 moves, the larger the connecting area between the fuel air supply pipe 6 and the air supply pipe 4, and the larger the flow rate of the fuel gas entering the air supply pipe 4.

[0047] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A boiler gas mixing air supply device, characterized in that: include: Blower (1); An air supply pipe (2), the inlet of which is connected to the outlet of the air supply fan (1); A filter screen (3), one side of which is connected to the outlet of the air supply pipe (2); An air delivery pipe (4) is coaxial with the air supply pipe (2), and its inlet is connected to the other side of the filter screen (3); A mixing chamber (5), the inlet of which is connected to the outlet of the gas delivery pipe (4); a combustion chamber (24) whose inlet is connected to the outlet of the mixing chamber (5); A fuel air delivery pipe (6), the outlet of which is connected to the air delivery pipe (4); A brush (7) is arranged staggered with the air supply pipe (2), and its bristles abut against the filter screen (3); The filter screen (3) is rotated by the motor (8) under the action of the transmission assembly, thereby changing the position of the filter screen (3) connected to the air supply pipe (4) and the air supply pipe (2), and generating relative movement with the brush (7); An axially arranged movable plate (5) is installed in the gas delivery pipe (4), an adjusting plate (29) vertically extends from one side of the movable plate (5), and the adjusting plate (29) is arranged at the outlet of the fuel gas delivery pipe (6), and the communicating area between the fuel gas delivery pipe (6) and the gas delivery pipe (4) is adjusted by the movement of the adjusting plate (29); The regulating plate (29) is away from the fuel air supply pipe (6), so that the power for increasing the connecting area between the fuel air supply pipe (6) and the air supply pipe (4) comes from the air pressure generated by the blower (1).

2. A boiler gas mixing air supply device according to claim 1, characterized in that: The transmission assembly comprises a rotating shaft (9), one end of which is fixedly connected to the center position of the filter screen (3), and the other end of which is rotatably connected to a fixed plate (10); The rotating shaft (9) is fixedly connected with a first bevel gear (11); The first bevel gear (11) is meshed with a second bevel gear (12); The second bevel gear (12) is connected to a worm gear (14) via a connecting shaft (13); The worm wheel (14) is meshed with a worm (15); The driving end of the motor (8) is fixedly connected to the worm (15).

3. A boiler gas mixing air supply device according to claim 1, characterized in that: The number of the fuel air delivery pipes (6) is four and they are arranged rotationally symmetrically with respect to the air delivery pipe (4).

4. A boiler gas mixing air supply device according to claim 3, characterized in that: A fixing ring (16) is arranged inside the gas delivery pipe (4); A limiting ring (17) axially extends from the inner ring of the fixing ring (16) on one side close to the fuel air supply pipe (6); The movable plate (28) is inserted between the limiting ring (17) and the inner wall of the gas delivery pipe (4); The inner and outer walls of the movable plate (28) are clamped with a sealing ring (18), which is sealed and connected to the limiting ring (17) and the air delivery pipe (4); A spring (19) is connected between the movable plate (28) and the fixed ring (16).

5. A boiler gas mixing air supply device according to claim 4, characterized in that: A moving cavity (20) is formed between the moving plate (28), the outer wall of the limiting ring (17), the fixing ring (16) and the inner wall of the gas delivery pipe (4); The air delivery pipe (4) is provided with an air hole (21) which is in communication with the moving chamber (20).

6. A boiler gas mixing air supply device according to claim 5, characterized in that: The fixed ring (16) is vertically connected to a sleeve (22) extending in the direction of the movable plate (28); The movable plate (28) is vertically connected with a positioning rod (23) inserted into the sleeve (22); The spring (19) is sleeved on the positioning rod (23), one end of which abuts against the adjustment movable plate (28) and the other end abuts against the end of the sleeve (22); the elastic force of the spring (19) drives the movable plate (28) away from the fixed ring (16).

7. A boiler gas mixing air supply device according to claim 1, characterized in that: A rotating wheel (25) is rotatably connected to the mixing chamber (5); A plurality of rotationally symmetrical arc-shaped blades (26) are arranged on the side of the rotating wheel (25); The inlet of the mixing chamber (5) faces the blade (26), so that the airflow entering the mixing chamber (5) can drive the impeller (25) to rotate.

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