Eccentrically-adjusted air door structure

Abstract

The invention discloses an eccentrically-adjusted air door structure which comprises a frame and a baffle blade installed on the inner side of the frame through a driving shaft, at least one eccentric baffle is additionally arranged on the baffle blade, the eccentric baffle is parallel to the center face of the baffle blade, and the eccentric baffle and the baffle blade are connected through at least two rib plates. The eccentric baffle and the rib plates do not exceed an imaginary cylinder formed by the driving shaft driving the baffle blades to rotate. According to the eccentrically-adjusted air door structure, the eccentric baffle is connected to the side face of the baffle blade through the rib plate, and the eccentric baffle and the rib plate do not exceed an imaginary cylinder formed by driving the baffle blade to rotate through the driving shaft, so that rotation control of the baffle blade is not affected, and the sensitivity of flow adjustment can be remarkably improved; even if the opening degree of a baffle blade reaches more than 60%, sensitive adjustment of flow can be realized, a load instruction is responded instantaneously, and a series of problems caused by poor adjustment characteristics of the hot air adjusting door are solved; the device is simple in structure, remarkable in effect, high in practicability and easy to popularize.

Description

Technical Field

[0001] The invention relates to an eccentrically adjusted damper structure, belonging to the technical field of dampers for regulating smoke and air systems in industrial production processes. Background Art

[0002] In industrial production processes, damper doors are commonly used to regulate the flow of smoke and air systems. These doors consist of at least a frame and damper blades. These blades are pressed into a V-shaped steel plate and form a streamlined structure with an intermediate connecting plate, end plates, and a drive shaft. They rotate within a range of 0 to 90 degrees, adjusting the smoke and air flow by changing the angle of the blades. If a frame contains multiple damper blades, they are externally connected by a linkage mechanism for synchronized operation. However, these commonly used damper doors in industry have poor flow regulation characteristics, with virtually no flow regulation effect above 60% opening, adversely affecting the corresponding industrial production process.

[0003] For example, the energy sector is developing clean and efficient coal-fired power. In addition to using carbon capture technology to reduce carbon emissions from coal-fired power plants, implementing flexible thermal power plant modifications to increase peak-shaving capabilities, thereby improving renewable energy consumption and enhancing the economic efficiency and efficiency of coal-fired units is also a key measure. Thermal power flexibility includes the ability of thermal power units to respond to changes in load commands. To enable units to quickly respond to load commands, it is crucial to quickly and accurately adjust the amount of air and dust entering the furnace. This rapid and accurate adjustment requires dampers with excellent regulation characteristics. A hot air regulating door and a flow measuring device are provided at the inlet of the coal mill. When the hot air regulating door is adjusted to an opening above 60%, it almost only changes the direction of the hot air flow and has very little effect on the flow regulation (flow change rate <10%). The change in the hot air flow direction is not conducive to stable measurement by the flow measuring device, which ultimately causes the hot air regulating door to be unable to be put into automatic operation. In addition, when the coal-fired power unit receives a load increase instruction, it generally increases the opening of the hot air regulating door first, and then increases the amount of coal in the coal mill. Due to the poor adjustment characteristics of the hot air regulating door and the significant increase in the coal mill resistance after the increase in coal amount, the coal mill powder output will decrease, which is not conducive to the unit's rapid response to the load instruction, and will also cause the main steam temperature and pressure fluctuations of the boiler to increase, thereby causing metal fatigue damage to the boiler water-cooled wall. Summary of the Invention

[0004] In order to improve the adjustment characteristics of a commonly used baffle damper, the present invention provides an eccentrically adjusted damper structure.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] An eccentrically adjusted damper structure comprises a frame and baffle blades mounted on the inner side of the frame via a drive shaft, wherein at least one eccentric baffle is added to the baffle blade, the eccentric baffle and the center plane of the baffle blade are parallel to each other, and the eccentric baffle and the baffle blade are connected by at least two ribs; the eccentric baffle and the ribs do not extend beyond the imaginary cylinder formed by the baffle blade rotating when the drive shaft drives the baffle blade.

[0007] After research, the applicant found that the eccentric baffle is connected to the side of the baffle blade through a rib plate, and the eccentric baffle and the rib plate do not exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate. This does not affect the rotation control of the baffle blade and can significantly improve the sensitivity of flow regulation. Even if the opening of the baffle blade reaches more than 60%, the regulating effect on the flow is very large, and the flow change rate reaches about 30%. It can respond to load instructions instantaneously, solving a series of problems caused by poor adjustment characteristics of the hot air adjustment door.

[0008] When adjusting the opening of existing baffle doors from 0 to 60%, the flow rate varies greatly, even suddenly, making it difficult to accurately control. When adjusting the opening above 60%, it almost only changes the direction of the hot air flow and has very little effect on flow regulation. When the opening is adjusted from 60% to 100%, the flow rate change rate is less than 10%. However, the present application significantly improves the flow regulation performance through the design of the baffle blade structure. When adjusting the opening from 0 to 100%, the flow rate changes evenly without sudden changes, significantly improving the accuracy of flow control. When the opening is adjusted from 60% to 100%, the flow rate change rate still reaches about 30%, significantly improving the controllability of flow regulation.

[0009] The central plane of the baffle blade refers to a plane located at (or passing) the center of the baffle blade in the thickness direction.

[0010] The above-mentioned “imaginary cylinder formed by the baffle blades rotating due to the driving shaft” refers to the spatial geometric body formed by the trajectory of the baffle blades when they rotate one circle.

[0011] The above-mentioned “the eccentric baffle and the rib plate do not exceed the imaginary cylinder formed by the rotation of the baffle blades driven by the drive shaft”, that is, the eccentric baffle and the rib plate are both located in and / or on the imaginary cylinder formed by the rotation of the baffle blades driven by the drive shaft.

[0012] When a frame contains multiple baffle blades, they are connected externally through a connecting rod mechanism and move synchronously. This application does not specifically improve the structure of the connecting rod mechanism and the connection method with the drive shaft, motor, etc., and can refer to existing mature technologies or product manuals, so it will not be repeated here.

[0013] To further enhance the sensitivity of flow regulation, each baffle blade is equipped with two eccentric baffles, one on each side of the baffle blade. Preferably, the two eccentric baffles are of identical shape and size and symmetrically located on either side of the baffle blade. This allows for sensitive flow regulation even when the baffle blade opening exceeds 60%.

[0014] As one specific implementation solution, the baffle blades and the eccentric baffle are both rectangular (including two short sides and two long sides). The two short sides of the baffle blades are mounting ends, and the drive shaft is arranged at the mounting ends or passes through the mounting ends.

[0015] In order to facilitate installation and control, the baffle blades and the eccentric baffle are parallel to each other in length and width.

[0016] In order to ensure the flow regulation effect and smoothness of the regulation, the length of the eccentric baffle is the same as the length of the baffle blade and the ends are flush (that is, the two ends of the eccentric baffle and the baffle blade in the length direction are flush), and the width of the eccentric baffle is smaller than the width of the baffle blade.

[0017] In order to improve the balance and controllability of flow regulation, the center line of the vertical projection of the eccentric baffle on the baffle blade overlaps with the center line of the baffle blade.

[0018] In order to balance the sensitivity and smoothness of flow regulation, it is further preferred that the two long sides of the eccentric baffle fall on the cylindrical surface of an imaginary cylinder, which is the spatial geometric body enclosed by the long side tracks of the baffle blades when the baffle blades rotate one circle.

[0019] To further improve the damper adjustment characteristics, preferably, when two or more baffle blades are provided on the inner side of the frame, the rotation directions of the two adjacent baffle blades are opposite (i.e., one rotates clockwise and the other rotates counterclockwise). This can further improve the sensitivity of the flow adjustment.

[0020] In order to meet the needs of general working conditions and facilitate control, the frame is preferably a rectangular frame structure with 2-4 baffle blades installed inside the frame. Of course, for special working conditions, the frame shape can be changed and baffle blades can be added as needed.

[0021] In order to further improve the sensitivity of flow regulation, it is further preferred that the distance between the eccentric baffle and the center plane of the baffle blade is 1 / 4 to 1 / 3 of the width of the baffle blade. This can control the flow more accurately and sensitively.

[0022] The above-mentioned “distance between the eccentric baffle and the center plane of the baffle blade” refers to the distance between the side of the eccentric baffle facing the baffle blade and the center plane of the baffle blade.

[0023] To improve structural reliability, it is preferred that when the baffle blades are in the fully open state, the ribs are perpendicular to the flow cross-section of the frame. This ensures structural strength while not affecting flow regulation and ensuring the sensitivity of flow regulation.

[0024] During operation, when the baffle blades are in a fully open state, the baffle blades are perpendicular to the flow cross-section of the frame; and when the baffle blades are in a fully closed state, the baffle blades are parallel to the flow cross-section of the frame, covering the flow cross-section of the frame and cutting off the flow.

[0025] The flow cross section of the frame of the present application, that is, the cross section of the gas flowing inside the frame during operation, is perpendicular to the axis of the frame.

[0026] Further preferably, each eccentric baffle is connected to the baffle blades via 4-8 ribs.

[0027] For technologies not mentioned or particularly described in the present invention, reference is made to the prior art.

[0028] The eccentrically adjusted damper structure of the present invention connects the eccentric baffle to the side of the baffle blade through a rib plate, and the eccentric baffle and the rib plate do not extend beyond the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate. This does not affect the rotation control of the baffle blade and can significantly improve the sensitivity of flow regulation. Even if the opening of the baffle blade reaches more than 60%, sensitive flow regulation can be achieved, and load instructions can be responded to instantaneously, solving a series of problems caused by poor adjustment characteristics of the hot air adjustment door. The structure is simple, the effect is significant, the practicability is strong, and it is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the baffle blade of the present invention;

[0030] Figure 2 for Figure 1 Left view of;

[0031] Figure 3 for Figure 1 Stereoscopic image of

[0032] Figure 4 This is a front view of the eccentrically adjusted damper structure of the present invention (single page);

[0033] Figure 5 for Figure 4 Left view of;

[0034] Figure 6 for Figure 4 A top view (perspective);

[0035] Figure 7 This is a front view of the eccentrically adjusted damper structure of the present invention (2 pages - split);

[0036] Figure 8 for Figure 7 Left view of;

[0037] Figure 9 for Figure 7 A top view (perspective);

[0038] Figure 10 for Figure 7 Three-dimensional Figure 1 ;

[0039] Figure 11 for Figure 7 Three-dimensional Figure 2 ;

[0040] Figure 12 A comparison diagram of the adjustment of the eccentrically adjusted damper (b1-b2) of the present invention and the conventional baffle door (a1-a2);

[0041] Figure 13 This is a front view of the eccentrically adjusted damper structure of the present invention (3 pages - split);

[0042] Figure 14 for Figure 13 Left view of;

[0043] Figure 15 for Figure 13 A top view (perspective);

[0044] Figure 16 for Figure 13 Three-dimensional Figure 1 ;

[0045] Figure 17 for Figure 13 Three-dimensional Figure 2 ;

[0046] Figure 18 This is a front view of the eccentrically adjusted damper structure of the present invention (4 pages - split);

[0047] Figure 19 for Figure 18 Left view of;

[0048] Figure 20 for Figure 18 A top view (perspective);

[0049] In the figure, 1 is a frame, 2 is a baffle blade, 3 is an eccentric baffle, 4 is a rib plate, 5 is a drive shaft, and 6 is a connecting rod mechanism. DETAILED DESCRIPTION

[0050] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

[0051] Example 1

[0052] An eccentrically adjusted damper structure comprises a frame and baffle blades mounted on the inner side of the frame via a drive shaft, wherein at least one eccentric baffle is added to the baffle blade, the eccentric baffle and the center plane of the baffle blade are parallel to each other, and the eccentric baffle and the baffle blade are connected by at least two ribs; the eccentric baffle and the ribs do not extend beyond the imaginary cylinder formed by the baffle blade rotating when the drive shaft drives the baffle blade.

[0053] It has been verified that the eccentric baffle is connected to the side of the baffle blade through the rib plate, and the eccentric baffle and the rib plate do not exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate. This does not affect the rotation control of the baffle blade and can significantly improve the sensitivity of flow regulation. Even if the opening of the baffle blade reaches more than 60%, the regulating effect on the flow (flow change rate) can reach about 30%, which can respond instantaneously to the load command, solving a series of problems caused by poor adjustment characteristics of the hot air adjustment door.

[0054] Example 2

[0055] On the basis of Example 1, the following improvements were made: In order to further improve the sensitivity of flow regulation, Figure 1-3 As shown, each baffle blade is equipped with two eccentric baffles, one on each side. These two eccentric baffles are identical in shape and size and are symmetrically located on either side of the baffle blade. This allows for sensitive flow control even when the baffle blade is opened more than 60%.

[0056] Example 3

[0057] On the basis of Example 2, the following improvements were made: Figure 1-3 As shown, the baffle blades and eccentric baffle are both rectangular. To ensure effective flow regulation and smooth flow regulation, the eccentric baffle is the same length as the baffle blades, with their ends aligned. The eccentric baffle is also smaller than the baffle blades, with its two long sides falling on the cylindrical surface of the imaginary cylinder.

[0058] Example 4

[0059] Based on Example 3, the following improvements were made: the frame has a rectangular frame structure, and the distance between the eccentric baffle and the center plane of the baffle blade is 1 / 3 of the baffle blade width (it has been verified that it can also be 1 / 4, etc.); each eccentric baffle is connected to the baffle blade by six ribs (it has been verified that it can also be 4, 5, 7, etc.). When the baffle blades are fully open, the ribs are perpendicular to the flow cross-section of the frame; when the baffle blades are fully closed, the baffle blades are parallel to the flow cross-section of the frame, covering the flow cross-section of the frame and blocking flow. This ensures structural strength while not affecting flow regulation, ensuring the sensitivity of flow regulation.

[0060] like Figure 4-6 As shown, in this example, a baffle blade is installed within the frame. The end of the drive shaft extends through the frame and is driven by a motor, which in turn drives the baffle blade. Applied to the cold primary air duct at the inlet of a medium-speed coal mill in a coal-fired power plant, the baffle blade's rotation is flexible and controllable (0 to 90 degrees, corresponding to a baffle blade opening of 0 to 100%). Compared to conventional baffle doors, the air resistance in the fully open state (100% opening) is consistent, and the tightness in the fully closed state (0% opening) is similar. However, when the baffle blade opening reaches above 60%, the regulation linearity is significantly better than that of conventional baffle doors, and the flow rate regulation effect (flow rate change rate) reaches approximately 32%.

[0061] Example 5

[0062] The difference from Example 4 is that: Figure 7-11 As shown, in this example, two baffle blades are installed within the frame. The ends of each drive shaft extend through the frame and are connected by a connecting rod mechanism. The motor drives the connecting rod mechanism, which in turn drives the two baffle blades to rotate synchronously. The two baffle blades rotate in opposite directions. When used on the hot primary air duct at the inlet of a medium-speed coal mill in a coal-fired power plant, the baffle blades can rotate flexibly and controllably (0-90°, corresponding to a baffle blade opening of 0-100%). Compared with conventional baffle doors, the air resistance in the fully open state (100% opening) is consistent, and the tightness in the fully closed state (0 opening) is similar. However, when the baffle blade opening reaches above 60%, the adjustment linearity of the present invention is significantly better than that of conventional baffle doors, and the flow regulation effect (flow rate change rate) reaches approximately 30%.

[0063] like Figure 12 As shown, if a conventional damper door is used, under the same working conditions, the opening of the damper blade reaches more than 60%, and the regulating effect on the flow (flow rate of change) is less than 8%.

[0064] Example 6

[0065] The difference from Example 4 is that: Figure 13-17As shown, in this example, three baffle blades are installed within the frame. The ends of each drive shaft extend through the frame and are connected by a connecting rod mechanism. The motor drives the connecting rod mechanism, which in turn drives the three baffle blades to rotate synchronously. The rotation directions of any two adjacent baffle blades are relative (from left to right, counterclockwise, clockwise, and counterclockwise, or clockwise, counterclockwise, and clockwise). When used on the hot primary air duct at the inlet of a medium-speed coal mill in a coal-fired power plant, the baffle blades can rotate flexibly and controllably (0-90°, corresponding to a baffle blade opening of 0-100%). Compared with conventional baffle doors, the wind resistance is consistent in the fully open state (100% opening) and the tightness is similar in the fully closed state (0 opening). However, when the baffle blade opening reaches above 60%, the adjustment linearity is significantly better than that of conventional baffle doors, and the flow regulation effect (flow rate change rate) reaches approximately 30%.

[0066] Example 7

[0067] The difference from Example 4 is that: Figure 18-20 As shown, in this example, four baffle blades are installed within the frame. The ends of each drive shaft extend through the frame and are connected by two sets of connecting rod mechanisms. The motor drives the connecting rod mechanism, which in turn drives the four baffle blades to rotate synchronously. The rotation directions of any two adjacent baffle blades are relative (from left to right, counterclockwise, clockwise, counterclockwise, and clockwise, or clockwise, counterclockwise, clockwise, and counterclockwise). When used on the hot primary air duct at the inlet of a medium-speed coal mill in a coal-fired power plant, the baffle blades can rotate flexibly and controllably (0-90°, corresponding to a baffle blade opening of 0-100%). Compared with conventional baffle doors, the air resistance in the fully open state (100% opening) is consistent, and the tightness in the fully closed state (0 opening) is similar. However, when the baffle blade opening reaches above 60%, the adjustment linearity of the present invention is significantly better than that of conventional baffle doors, and the flow regulation effect (flow rate change rate) reaches approximately 28%.

[0068] The eccentrically adjusted damper structure of the above-mentioned examples connects the eccentric baffle to the side of the baffle blade through a rib plate, and the eccentric baffle and the rib plate do not exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate. This does not affect the rotation control of the baffle blade and can significantly improve the sensitivity of flow regulation. Even if the opening of the baffle blade reaches more than 60%, the flow can be sensitively regulated and the load instruction can be responded to instantaneously, solving a series of problems caused by poor adjustment characteristics of the hot air adjustment door. It has a simple structure, significant effect, strong practicality and is easy to promote.

Claims

1. An eccentrically adjustable damper structure comprising a frame and baffle blades mounted on the inner side of the frame via a drive shaft, characterized in that: At least one eccentric baffle is added to the baffle blade, the eccentric baffle is parallel to the center plane of the baffle blade, and the eccentric baffle and the baffle blade are connected by at least two ribs; the eccentric baffle and the rib do not exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate.

2. The eccentrically adjustable damper structure according to claim 1, characterized in that: Two eccentric baffles are installed on each baffle blade, and the two eccentric baffles are distributed on both sides of the baffle blade.

3. The eccentrically adjustable damper structure according to claim 2, characterized in that: The two eccentric baffles have the same shape and size and are symmetrically distributed on both sides of the baffle blade.

4. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: The baffle blades and the eccentric baffle are both rectangular, the length directions of the baffle blades and the eccentric baffle are parallel to each other, the length of the eccentric baffle is the same as the length of the baffle blades and the ends are aligned, and the width of the eccentric baffle is smaller than the width of the baffle blades.

5. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: A center line of a vertical projection of the eccentric baffle on the baffle blade overlaps with a center line of the baffle blade.

6. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: The two long sides of the eccentric baffle fall on the cylindrical surface of the imaginary cylinder.

7. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: When more than two baffle blades are provided on the inner side of the frame, the rotation directions of every two adjacent baffle blades are opposite.

8. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: The frame is a rectangular frame structure, and 2-4 baffle blades are installed in the frame.

9. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: The distance between the eccentric baffle and the center plane of the baffle blade is 1 / 4 to 1 / 3 of the width of the baffle blade.

10. The eccentrically adjustable damper structure according to any one of claims 1 to 3, characterized in that: When the baffle blades are in a fully opened state, the ribs are perpendicular to the flow cross-section of the frame; each eccentric baffle is connected to the baffle blades via 4-8 ribs.

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