Air supply device and boiler

Abstract

The air supply device comprises a draught fan body, an air supply pipeline and an adjusting piece, the air supply pipeline is connected to an air outlet of the draught fan body, a channel for air circulation is formed in the air supply pipeline, the adjusting piece is arranged in the channel, and the adjusting piece is rotatably connected to the air supply pipeline around a pivot axis; the adjusting part is arranged in the channel and used for adjusting the circulation area, for gas circulation, of the channel, the adjusting part comprises a square frame capable of rotating around a pivot axis, the four circumferential sides, around the pivot axis, of the square frame are open to form a first flow channel and a second flow channel, the two ends of the first flow channel are not blocked, and at least one of the two ends of the second flow channel is provided with a blocking part. The pivot axis is perpendicular to the extension direction of the channel. By means of the technical scheme, the positions of the first flow channel and the second flow channel can be switched by rotating the square frame, so that the sectional area of shielding gas in the channels is adjusted, the flow area of the gas is adjusted, and the flow speed and flow of the gas can be adjusted.

Description

Technical Field

[0001] The present disclosure relates to the technical field of boilers, and in particular, to an air supply device and a boiler. Background Art

[0002] The boiler air blower is a very important component in the boiler system, mainly responsible for sucking air into the boiler for oxidation reaction, so that the combustibles can be more fully oxidized, thereby improving the efficiency and heat output of the boiler. At the same time, it can also strengthen the air pressure to generate high-temperature and high-pressure steam to provide energy for power plants, heat stations, etc.

[0003] In the related art, by controlling the rotation speed of the air blower, the flow rate and flow volume of the gas at the air outlet are adjusted, so that the combustion of the fuel in the coal-fired boiler is more stable. However, the combustion of the fuel in the coal-fired boiler is also affected by other factors such as pressure. Therefore, it is necessary to frequently adjust the flow rate and flow volume of the gas to adapt to the fuel combustion under different pressure conditions and improve the heat conversion rate. However, frequently adjusting the rotation speed of the air blower is not convenient and is likely to have a greater impact on the air blower, reducing its service life. Summary of the Utility Model

[0004] The purpose of the present disclosure is to provide an air supply device and a boiler, and the air supply device can adjust the flow rate and flow volume of the gas to at least partially solve the above technical problems.

[0005] To achieve the above purpose, according to the first aspect of the present disclosure, an air supply device is provided, including:

[0006] A fan body;

[0007] An air supply duct connected to the air outlet of the fan body, and the interior of the air supply duct has a passage for gas to flow through; and

[0008] An adjusting member disposed in the passage, the adjusting member is rotatably connected to the air supply duct about a pivot axis for adjusting the flow area of the passage for gas to flow through. The adjusting member includes a square frame rotatable about the pivot axis. The circumferential four sides of the square frame are open about the pivot axis to form a first flow channel and a second flow channel. Both ends of the first flow channel are unobstructed, and at least one end of both ends of the second flow channel is provided with a blocking member, and the pivot axis is perpendicular to the extending direction of the passage.

[0009] Optionally, the adjusting member further includes a partition member connected to the square frame. The number of the partition members is multiple and they are distributed at intervals about the pivot axis, and the blocking member is connected to two adjacent partition members.

[0010] Optionally, the blocking member includes a first blocking portion disposed at the air inlet end of the second flow channel. The first blocking portion includes a plurality of windshields disposed obliquely to the extending direction of the second flow channel. The plurality of windshields are connected to the square frame or the partition member through a first connecting member.

[0011] Optionally, the blocking member includes a second blocking portion disposed at the air outlet end of the second flow channel. The second blocking portion includes a plurality of wind blocking plates. The plurality of wind blocking plates are disposed parallel to the extending direction of the second flow channel and are connected to the square frame or the partition member through a second connecting member.

[0012] Optionally, the air supply device includes a driving motor drivingly connected to the square frame. The driving motor drives the square frame to rotate so that the gas flows through the first flow channel and / or the second flow channel.

[0013] Optionally, an intermediate pipe is communicatively disposed between the air supply pipe and the fan body. A first air guiding plate is detachably disposed inside the intermediate pipe. A plurality of first air guiding holes are formed at intervals on the first air guiding plate.

[0014] Optionally, a movable second air guiding plate is disposed inside the intermediate pipe. A plurality of second air guiding holes are formed at intervals on the second air guiding plate.

[0015] Optionally, the ventilation area of the second air guiding holes is smaller than the ventilation area of the first air guiding holes.

[0016] Optionally, a filter screen is connected to the air inlet of the fan body.

[0017] According to a second aspect of the present disclosure, there is provided a boiler including the air supply device as described above.

[0018] Through the above technical solution, that is, by rotating the square frame, the area blocking the gas flow in the channel can be adjusted, so as to adjust the flow area for the gas to flow through the channel, and further the flow rate and flow volume of the gas can be adjusted. Specifically, the square frame has a first flow channel and a second flow channel through which the gas can pass. Rotating the square frame around the pivot axis perpendicular to the gas flow direction can switch the positions of the first flow channel and the second flow channel, so as to adaptively make the extending direction of the first flow channel conform to the gas flow direction in the channel, or the extending direction of the second flow channel conform to the gas flow direction in the channel, or at least part of the first flow channel and at least part of the second flow channel conform to the gas flow direction in the channel at the same time. Thus, the flow area of the gas can be adjusted by adjusting the blocking area of the blocking member in the gas flow direction, and further the flow rate and flow volume of the gas can be adjusted.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the accompanying drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of the air supply device provided in an exemplary embodiment of the present disclosure;

[0022] Figure 2 is a schematic diagram of the overall structure of the adjusting member provided in an exemplary embodiment of the present disclosure;

[0023] Figure 3 is a schematic top view structure diagram of the square frame provided in an exemplary embodiment of the present disclosure;

[0024] Figure 4 is a schematic diagram of the structures of the first air deflector and the second air deflector provided in an exemplary embodiment of the present disclosure.

[0025] DESCRIPTION OF THE REFERENCE NUMERALS

[0026] 1, fan body; 11, air outlet; 12, air inlet; 13, filter screen; 2, air supply duct; 21, channel; 3, adjusting member; 31, square frame; 311, first flow channel; 312, second flow channel; 4, blocking member; 41, first blocking portion; 411, wind deflector; 412, first connecting member; 42, second blocking portion; 421, wind blocking plate; 422, second connecting member; 5, separating member; 6, driving motor; 7, intermediate duct; 8, first air deflector; 81, first air guiding hole; 9, second air deflector; 91, second air guiding hole. DETAILED DESCRIPTION

[0027] The following will describe in detail the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present disclosure, and are not used to limit the present disclosure.

[0028] In the present disclosure, unless otherwise stated, "inside and outside" refer to the inside and outside of the contour of the corresponding component; "far and near" refer to the far and near in the spatial position of the corresponding component relative to another component. In addition, the terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another, and do not have an order or importance. When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] According to a first aspect of the present disclosure, with reference to Figures 1 to 4, the present disclosure provides an air supply device, including a fan body 1, an air supply duct 2 and an adjusting member 3. Among them, the air supply duct 2 is connected to the air outlet 11 of the fan body 1. The inside of the air supply duct 2 has a passage 21 for gas to flow through. The adjusting member 3 is arranged in the passage 21. The adjusting member 3 is rotatably connected to the air supply duct 2 around a pivot axis for adjusting the flow area of the passage 21 for gas to flow through. The adjusting member 3 includes a square frame 31 that is rotatable around the pivot axis. The four circumferential sides of the square frame 31 are open around the pivot axis to form a first flow channel 311 and a second flow channel 312. Both ends of the first flow channel 311 are unobstructed, and at least one end of the two ends of the second flow channel 312 is provided with a blocking member 4. Among them, the pivot axis is perpendicular to the extending direction of the passage 21.

[0030] Through the above technical solution, that is, by rotating the square frame 31, the area blocking the gas flow in the passage 21 can be adjusted, so as to adjust the flow area of the passage 21 for gas to flow through, and further the flow rate and flow of the gas can be adjusted. Specifically, the square frame 31 has a first flow channel 311 and a second flow channel 312 through which gas can pass. Rotating the square frame 31 around the pivot axis perpendicular to the gas flow direction can switch the positions of the first flow channel 311 and the second flow channel 312, so as to adaptively make the extending direction of the first flow channel 311 conform to the gas flow direction in the passage 21, or the extending direction of the second flow channel 312 conform to the gas flow direction in the passage 21, or at least part of the first flow channel 311 and at least part of the second flow channel 312 conform to the gas flow direction in the passage 21 at the same time. Thus, the flow area of the gas can be adjusted by adjusting the blocking area of the blocking member 4 in the gas flow direction, and further the flow rate and flow of the gas can be adjusted.

[0031] In an exemplary application scenario, for example, the air supply device can be applied to a boiler. During the air supply process, when the boiler requires a large amount of air volume, the square frame 31 can be rotated to make the extending direction of the first flow channel 311 conform to the gas flow direction in the passage 21, so that there is no blocking effect on the gas flow in the passage 21, and the flow rate and flow of the gas in the passage 21 are large; when the boiler requires a small amount of air volume, the square frame 31 can be rotated to make the extending direction of the second flow channel 312 conform to the gas flow direction in the passage 21, so that the blocking area of the blocking member 4 in the gas flow direction is the largest, reducing the flow rate and flow of the gas in the passage 21; when the boiler requires a moderate amount of air volume, the square frame 31 can be rotated to make at least part of the first flow channel 311 and at least part of the second flow channel 312 conform to the gas flow direction in the passage 21 at the same time, so that the blocking member 4 at least partially blocks the gas flow in the passage 21, thereby adjusting the flow rate and flow of the gas in the passage 21.

[0032] In some embodiments, referring toFigure 2 and Figure 3 Moreover, the adjusting member 3 may further include a partition member 5 connected to the square frame 31. The number of the partition members 5 is multiple and they are distributed at intervals around the pivot axis. The blocking member 4 may be connected to two adjacent partition members 5. In this way, the partition member 5 can improve the structural strength of the square frame 31 and at the same time provide an installation base for the blocking member 4. Exemplarily in the present disclosure, the number of the partition members 5 is set to four so as to cooperate with the square frame 31 to form the air inlets 12 and outlets 11 of the first flow channel 311, and the air inlets 12 and outlets 11 of the second flow channel 312. Among them, the first end of the partition member 5 is connected to the square frame 31, and the second end of the partition member 5 opposite to the first end can contact the inner wall of the air supply duct 2. It can be understood that during the rotation of the square frame 31, at least two relatively arranged second ends of the partition members 5 are in contact with the inner wall of the air supply duct 2, so that when the gas flows in the channel 21, it passes through at least one of the first flow channel 311 and the second flow channel 312, so as to adjust the flow rate and velocity of the gas. In some other possible embodiments not shown in the drawings, the number of the partition members 5 can also be set to multiple. For example, the number of the partition members 5 can be set to eight. For example, one partition member 5 can be additionally provided at each of the air inlets 12 and outlets 11 of the first flow channel 311 and the air inlets 12 and outlets 11 of the second flow channel 312 to guide the flow of the gas. The present disclosure is not limited thereto.

[0033] In some embodiments, referring to Figure 2 and Figure 3 , the blocking member 4 may include a first shielding portion 41 provided at the air inlet end of the second flow channel 312. The first shielding portion 41 includes a plurality of windshields 411 inclined to the extending direction of the second flow channel 312. In this way, when the gas flows through the second flow channel 312, its flow rate is reduced due to the blocking effect of the windshields 411. At the same time, the inclined arrangement of the windshields 411 can guide part of the gas to flow in a direction deviating from the channel 21, so as to reduce the flow rate of the gas in the channel 21. This part of the gas can be temporarily stored in the cavity formed by the partition member 5 and the inner wall of the air supply duct 2. Among them, the plurality of windshields 411 can be connected to the square frame 31 or the partition member 5 through a first connecting member 412. It can be understood that the first connecting member 412 can be constructed in any suitable manner. For example, the first connecting member 412 may include a first connecting rod, and both ends of the first connecting rod are respectively connected to two partition members 5 forming the air inlet 12 of the second flow channel 312. Of course, in order to improve the acting strength of the windshields 411, the number of the first connecting rods can also be set to multiple. The present disclosure does not make specific limitations thereto.

[0034] In some embodiments, referring to Figure 2 and Figure 3, the blocking member 4 may further include a second blocking portion 42 disposed at the air outlet end of the second flow channel 312. The second blocking portion 42 includes a plurality of wind blocking plates 421. In this way, when the gas flows through the second flow channel 312, it is blocked by the wind blocking plates 421, and part of the gas cannot pass through the air outlet 11 of the second flow channel 312, so that the flow rate of the gas in the channel 21 is reduced. At the same time, this part of the gas can interact with the gas flowing in the channel 21 to reduce the flow velocity. Among them, the plurality of wind blocking plates 421 are arranged parallel to the extension direction of the second flow channel 312 and are connected to the square frame 31 or the partition member 5 through the second connecting member 422. It can be understood that the second connecting member 422 can be constructed in any suitable manner. For example, the second connecting member 422 may include a second connecting rod, and both ends of the second connecting rod are respectively connected to the two partition members 5 forming the air outlet 11 of the second flow channel 312. Of course, in order to improve the acting strength of the wind blocking plates 421, the number of the second connecting rods can also be set to be multiple, and the present disclosure does not make specific limitations on this.

[0035] In some embodiments, referring to Figure 1 and Figure 2 , the air supply device includes a driving motor 6 drivingly connected to the square frame 31. The driving motor 6 drives the square frame 31 to rotate so that the gas flows through the first flow channel 311 and / or the second flow channel 312. In this way, the square frame 31 can be driven to rotate by the driving motor 6 according to the actual air supply demand. For example, when the air supply demand is large, the driving motor 6 can drive the square frame 31 to rotate so that the extension direction of the first flow channel 311 conforms to the gas flow direction in the channel 21. At this time, the wind blocking plate 411 and the wind blocking plates 421 have no blocking effect on the gas flow in the channel 21, and the flow velocity and flow rate of the gas in the channel 21 are large to meet the air supply demand; when the air supply demand is small, the driving motor 6 can drive the square frame 31 to rotate so that the extension direction of the second flow channel 312 conforms to the gas flow direction in the channel 21. At this time, the wind blocking plate 411 and the wind blocking plates 421 act together to form the largest blocking area in the gas flow direction, thereby reducing the flow velocity and flow rate of the gas in the channel 21; when the air supply demand is moderate, the driving motor 6 can drive the square frame 31 to rotate so that at least part of the first flow channel 311 and at least part of the second flow channel 312 simultaneously conform to the gas flow direction in the channel 21. At this time, the wind blocking plate 411 and the wind blocking plates 421 partially block the gas flow in the channel 21, thereby adaptively adjusting the flow rate and flow velocity of the gas in the channel 21 to meet the air supply demand. The driving motor 6 can be connected to the square frame 31 through its own output shaft. At this time, the axis of the output shaft can be the pivot axis mentioned above. Or, the driving motor 6 can also be indirectly connected to the square frame 31 through a transmission shaft. At this time, the axis of the transmission shaft can be the pivot axis mentioned above. Among them, the output shaft of the motor and the transmission shaft can be connected through, for example, a coupling.

[0036] In some embodiments, with reference to Figure 1 and Figure 4 , an intermediate duct 7 may be communicatively provided between the air supply duct 2 and the fan body 1. A first air guiding plate 8 is detachably provided inside the intermediate duct 7. A plurality of first air guiding holes 81 are formed in the first air guiding plate 8 at intervals. In this way, during the air supply process, part of the gas can enter the channel 21 after passing through the first air guiding holes 81, and the remaining gas stays in the intermediate duct 7 due to the blocking effect of the shielding part of the first air guiding plate 8 where no first air guiding holes 81 are formed. Thus, by providing the first air guiding plate 8, it can cooperate with the wind blocking plate 411 and the air blocking plate 421 to further reduce the air supply volume. It can be understood that when the air supply demand is large, that is, when the first air guiding plate 8 does not need to play a role in reducing the air supply volume, the first air guiding plate 8 can be removed to reduce the blocking effect on the flowing gas. Among them, the first air guiding plate 8 can be connected to the intermediate duct 7 in any suitable manner. For example, the first air guiding plate 8 can be inserted into the inside of the intermediate duct 7 from the outside to the inside from one side of the intermediate duct 7. The self-plate structure of the first air guiding plate 8 can block and form an opening on the intermediate duct 7 for installing the first air guiding plate 8. Then, the first air guiding plate 8 can be detachably fixed inside the intermediate duct 7 by means such as bolt connection or snap fastening. Exemplarily, the pipe wall of the intermediate duct 7 and the first air guiding plate 8 can be threadedly connected on one side of the intermediate duct 7 to fix the first air guiding plate 8. The present disclosure does not make specific limitations on this.

[0037] In some embodiments, with reference to Figure 1 and Figure 4, a movable second air guide plate 9 can be arranged inside the middle duct 7, and a plurality of second air guide holes 91 arranged at intervals are formed on the second air guide plate 9. In this way, by moving the second air guide plate 9, the position of the second air guide holes 91 relative to the first air guide holes 81 can be changed, so as to further adjust the gas flow area. For example, the number of the second air guide holes 91 is the same as that of the first air guide holes 81. When the second air guide plate 9 is moved so that the second air guide holes 91 and the first air guide holes 81 are in one-to-one correspondence, the gas flow area is the largest. When the second air guide plate 9 is moved so that the corresponding second air guide holes 91 and the first air guide holes 81 are partially corresponding, part of the gas flow area of the second air guide holes 91 is blocked by the first air guide plate 8, and part of the gas flow area of the first air guide holes 81 is blocked by the second air guide plate 9, so the gas flow area is reduced. It can be understood that when the gas flow area of the second air guide holes 91 is completely blocked by the first air guide plate 8 and the gas flow area of the first air guide holes 81 is completely blocked by the second air guide plate 9, the gas cannot flow through the middle duct 7 to the channel 21 inside the air supply duct 2. Exemplarily, when the air supply device is applied to, for example, a boiler, when the boiler does not need air supply for a short time, the second air guide plate 9 can be adjusted without closing the fan body 1, so as to temporarily stop the gas flow, reduce the operation time of turning on the fan body 1 after it is turned off, and improve the work efficiency.

[0038] It can be understood that the ventilation area sizes of the second air guide holes 91 and the first air guide holes 81 can be set arbitrarily. In order to facilitate the second air guide plate 9 to cooperate with the first air guide plate 8 to adjust the gas flow area, in some embodiments, referring to Figure 1 and Figure 4, the ventilation area of the second air guide hole 91 can be smaller than that of the first air guide hole 81. In this way, the air flow area can be reduced by the cooperation of the second air guide plate 9 and the first air guide plate 8. That is to say, when the second air guide holes 91 and the first air guide holes 81 are in one-to-one correspondence, the air flow area is the largest. At this time, the air flow area is the sum of the air flow areas of multiple second air guide holes 91. Compared with, for example, the ventilation area of the second air guide hole 91 being equal to that of the first air guide hole 81, the air flow area can be further reduced. Of course, when the second air guide plate 9 is moved so that the corresponding second air guide holes 91 and the first air guide holes 81 are partially corresponding, part of the air flow area of the second air guide holes 91 is blocked by the first air guide plate 8, and part of the air flow area of the first air guide holes 81 is blocked by the second air guide plate 9, so the air flow area is reduced. It should be noted that the adjustment of the air flow area described above is only based on the premise that the second air guide plate 9 is fully functional. For example, when the second air guide plate 9 is moved so that at most part of it is located in the middle pipe 7, at least part of the first air guide holes 81 is not blocked by the second air guide plate 9. At this time, the air flow area of the first air guide holes 81 is not affected, and the air flow area in the middle pipe 7 increases. The present disclosure is not limited to this.

[0039] In addition, the second air guide plate 9 can be connected to the middle pipe 7 in any suitable manner. For example, the second air guide plate 9 can be inserted into the interior of the middle pipe 7 from the outside to the inside on one side of the middle pipe 7. The self-plate structure of the second air guide plate 9 can block the opening formed on the middle pipe 7 for installing the second air guide plate 9. Among them, the second air guide plate 9 can be movably arranged inside the middle pipe 7 through a driving device. The driving device can be a hydraulic cylinder, a pneumatic cylinder or a linear motor, etc. Exemplarily, a hydraulic cylinder can be installed on one side of the middle pipe 7, and the second air guide plate 9 is connected to the piston rod of the hydraulic cylinder to realize the linear movement of the second air guide plate 9 inside the middle pipe 7. The present disclosure is not limited to this.

[0040] In some embodiments, referring to Figure 1 , a filter screen 13 can be connected to the air inlet 12 of the fan body 1. In this way, impurities such as dust particles carried in the gas can be blocked by the filter screen 13, so as to reduce the possibility that the impurities adhere to the first air guide holes 81 and the second air guide holes 91 on the subsequent gas flow path and affect the normal gas flow. At the same time, it can also reduce the possibility that the impurities adhere to the wind baffle 411 and the air blocking baffle 421 and affect the normal gas flow between the wind baffle 411 and the air blocking baffle 421. It can be understood that the filter screen 13 can be connected to the air inlet 12 of the fan body 1 by, for example, bolt connection or snap fastening, etc., so as to facilitate the replacement of the filter screen 13 after being used for a period of time and ensure the filtering effect of the filter screen 13. The present disclosure is not limited to this.

[0041] According to a second aspect of the present disclosure, a boiler is provided, including the air supply device as above. The boiler has all the beneficial effects of the above air supply device, which will not be elaborated herein again. The boiler can be, for example, a coal-fired boiler and can be applied to any suitable scenario such as a power plant according to actual application requirements. The present disclosure does not make specific limitations thereto.

[0042] The present disclosure exemplarily describes the usage process of the air supply device.

[0043] When the air supply demand is large, the driving motor 6 can be used to drive the square frame 31 to rotate so that the extending direction of the first flow channel 311 conforms to the gas flow direction in the channel 21. At this time, the wind baffle 411 and the air blocking baffle 421 do not block the gas flow in the channel 21, and the flow rate and flow volume of the gas in the channel 21 are large to meet the air supply demand.

[0044] When the air supply demand is small, the driving motor 6 can be used to drive the square frame 31 to rotate so that the extending direction of the second flow channel 312 conforms to the gas flow direction in the channel 21. At this time, the wind baffle 411 and the air blocking baffle 421 act together to form the largest shielding area in the gas flow direction, thereby reducing the flow rate and flow volume of the gas in the channel 21. Meanwhile, the first air guiding plate 8 and the second air guiding plate 9 can also be installed, and the shielding areas of the first air guiding plate 8 without the first air guiding holes 81 and the second air guiding plate 9 without the second air guiding holes 91 shield the gas.

[0045] When the air supply demand is moderate, the driving motor 6 can be used to drive the square frame 31 to rotate so that at least part of the first flow channel 311 and at least part of the second flow channel 312 simultaneously conform to the gas flow direction in the channel 21. At this time, the wind baffle 411 and the air blocking baffle 421 partially block the gas flow in the channel 21, thereby adaptively adjusting the flow volume and flow rate of the gas in the channel 21. Meanwhile, the position of the second air guiding plate 9 relative to the first air guiding plate 8 can also be moved so that the gas flows through the first air guiding holes 81 and the second air guiding holes 91, and part of the gas flow area of the second air guiding holes 91 is blocked by the first air guiding plate 8, and part of the gas flow area of the first air guiding holes 81 is blocked by the second air guiding plate 9.

[0046] When air supply is not required, the driving device can be used to move the second air guiding plate 9 so that the second air guiding holes 91 and the first air guiding holes 81 are arranged in a staggered manner. The gas flow area of the second air guiding holes 91 is completely blocked by the first air guiding plate 8, and the gas flow area of the first air guiding holes 81 is completely blocked by the second air guiding plate 9, and the gas flow area is closed.

[0047] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0049] Furthermore, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. An air supply device, characterized in that, Comprising: The fan body; The air supply duct, which is connected to the air outlet of the fan body, and the interior of the air supply duct has a passage for gas to flow through; And The adjusting member is disposed in the passage. The adjusting member is rotatably connected to the air supply duct about a pivot axis for adjusting the flow area of the passage for gas to flow through. The adjusting member includes a square frame that is rotatable about the pivot axis. The four circumferential sides of the square frame are open about the pivot axis to form a first flow channel and a second flow channel. Both ends of the first flow channel are unobstructed, and at least one end of both ends of the second flow channel is provided with a blocking member. The pivot axis is perpendicular to the extending direction of the passage.

2. The air supply device according to claim 1, characterized in that, The adjusting member further includes a partition member connected to the square frame. The number of the partition members is multiple and they are distributed at intervals about the pivot axis. The blocking member is connected to two adjacent partition members.

3. The air supply device according to claim 2, characterized in that, The blocking member includes a first shielding portion disposed at the air inlet end of the second flow channel. The first shielding portion includes a plurality of wind shielding plates that are inclined to the extending direction of the second flow channel. The plurality of wind shielding plates are connected to the square frame or the partition member through a first connecting member.

4. The air supply device according to claim 3, characterized in that, The blocking member includes a second shielding portion disposed at the air outlet end of the second flow channel. The second shielding portion includes a plurality of wind blocking plates that are arranged parallel to the extending direction of the second flow channel and are connected to the square frame or the partition member through a second connecting member.

5. The air supply device according to claim 1, characterized in that, The air supply device includes a driving motor drivingly connected to the square frame. The driving motor drives the square frame to rotate so that the gas flows through the first flow channel and / or the second flow channel.

6. The air supply device according to claim 1, wherein An intermediate duct is communicatively provided between the air supply duct and the fan body. A first air guiding plate is detachably disposed inside the intermediate duct, and a plurality of first air guiding holes are formed in the first air guiding plate and are arranged at intervals.

7. The air supply device according to claim 6, characterized in that, A movable second air guiding plate is disposed inside the intermediate duct, and a plurality of second air guiding holes are formed in the second air guiding plate and are arranged at intervals.

8. The air supply device according to claim 7, characterized in that, The ventilation area of the second air guiding holes is smaller than the ventilation area of the first air guiding holes.

9. The air supply device according to claim 1, characterized in that, A filter screen is connected to the air inlet of the fan body.

10. A boiler, characterized in that, Comprising the air supply device according to any one of claims 1-9.

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