A steam-electric dual drive power switching clutch for a heating unit induced draft fan

Abstract

The utility model provides a kind of heat supply unit air fan steam and electricity double drive power switching clutch, including steam turbine and tooth block plate, the center rotation of steam turbine is connected with first rotating shaft, and the front end of first rotating shaft is equipped with gear, and the other end of first rotating shaft is installed in the front end of motor, the gear is engaged together between the tooth block of gear and tooth block plate upper side, and the lower end surface front of tooth block plate is provided with pull shaft, the pull shaft is inserted in the insertion hole of driven sleeve in clutch middle part, and driven sleeve is sleeved in driven shaft. The utility model is coaxially connected using steam turbine and motor, and the same load is driven together;When steam source is sufficient, high-pressure steam, low-pressure steam can be flexibly used to enter and exit steam turbine air cavity to drive rotating shaft rotation, to pull clutch opening, close operation, when steam source is insufficient, start motor to drive clutch operation, steam and electricity flexible double drive are convenient, ensure running safety and energy-saving effect, also more flexible, efficient and practical.

Description

Technical Field

[0001] This utility model relates to the field of clutch technology, specifically to a dual-drive power switching clutch for a heating unit's induced draft fan. Background Technology

[0002] Exhaust draft fans are key auxiliary machines in boiler systems of thermal power plants. Traditionally driven solely by electric motors, they consume significant amounts of electricity. Exhaust draft fans are crucial ventilation devices that use an electric motor to drive an impeller, increasing gas pressure and expelling flue gas or waste gas. They are widely used in boiler systems, industrial production, and environmental control. Exhaust draft fans are primarily used to extract gas from the system, creating a negative pressure environment to effectively remove combustion gases, dust, or other harmful gases. They play a vital role in ensuring safety and improving energy efficiency in industries such as power, metallurgy, chemical, construction, and environmental protection. As a core component of industrial ventilation systems, induced draft fans not only determine the system's emission efficiency and safety but also directly impact energy consumption and operation and maintenance costs. In combined heat and power (CHP) units, induced draft fans are key auxiliary machines in boiler systems, primarily used to extract flue gas generated after boiler combustion, maintain negative pressure in the furnace, ensure stable combustion, and deliver the flue gas to the desulfurization system or chimney for emission. In CHP projects, the operating efficiency of the induced draft fan directly affects the overall energy efficiency of power generation and heating. In recent years, the "steam-electric dual drive" retrofit scheme has been widely adopted to improve energy efficiency. This scheme involves connecting a small steam turbine and an electric motor in parallel to drive the same induced draft fan shaft system via a clutch, allowing for flexible switching or mixed use of the two power sources under different operating conditions.

[0003] The specification of a pneumatic fan clutch in the prior art (publication number CN111022519A) mentions that "the present invention includes a driven plate, a spline sleeve, a spline shaft, a piston seat, a friction plate, a wave spring, a friction strip, an O-ring seal one, an O-ring seal two, a hub bearing, and a drive plate; the driven plate has a coaxially arranged spline sleeve mounting hole and a vent hole at its center; the bottom end of the spline sleeve mounting hole communicates with the top end of the vent hole, and the bottom end of the vent hole is closed; an integrally formed and coaxially arranged cantilever cylinder is provided on the outer edge of the driven plate; the spline sleeve is coaxially fixed at the spline sleeve mounting hole of the driven plate; the spline shaft is sleeved inside the spline sleeve; the center of the spline shaft has an axially arranged and interconnected air inlet hole and air passage; the end of the air passage near the driven plate is open." However, the pneumatically driven clutch in the prior art is difficult to continuously drive when encountering insufficient energy, and is also easily affected by temperature to ensure normal clutch operation. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a dual-drive switching clutch for the induced draft fan of a heating unit is provided. This addresses the problems of existing pneumatically driven clutches, which are difficult to continuously drive when encountering insufficient energy and are also easily affected by temperature to ensure normal operating temperature.

[0005] To achieve the above objectives, a dual-drive switching clutch for a heating unit's induced draft fan is provided, comprising a steam turbine and a toothed plate. A first shaft is rotatably connected to the center of the steam turbine, and a gear is mounted on the front end of the first shaft. The other end of the first shaft is mounted on the front end of an electric motor. The gear meshes with a toothed block on the side of the toothed plate, and a pull shaft is provided at the front of the lower end of the toothed plate. The pull shaft is inserted into a hole opened on the driven sleeve in the middle of the clutch, and the driven sleeve is fitted onto the driven shaft.

[0006] Furthermore, the front part of the steam turbine is provided with a first air chamber, and a front impeller is movable in the first air chamber by rotating clockwise, and the center of the front impeller is fitted on the first rotating shaft.

[0007] Furthermore, a high-pressure steam outlet is provided on the upper front side of the first gas chamber, and a high-pressure steam inlet is provided on the upper rear side of the first gas chamber.

[0008] Furthermore, a second air chamber is provided in the rear part of the steam turbine, and a rear impeller rotates counterclockwise in the second air chamber, with the center of the rear impeller fitted on the first rotating shaft.

[0009] Furthermore, a low-pressure steam inlet is provided on the upper front side of the second gas chamber, and a low-pressure steam outlet is provided on the upper rear side of the second gas chamber.

[0010] Furthermore, a crankshaft is installed in the middle of the front part of the clutch, and the centers of the crankshaft and the driven shaft are located on the same axis. A spring is sleeved on the driven shaft, and the front and rear ends of the spring abut against the driven sleeve and the rear sleeve plate, respectively.

[0011] The beneficial effects of this utility model are as follows: 1. This utility model utilizes high-pressure steam passing through the high-pressure steam inlet and igniting the first gas chamber, which drives the four sets of front impellers in the first gas chamber to rotate clockwise together, thereby driving the first rotating shaft to rotate synchronously. At this time, the gear at the front end of the first rotating shaft rotates, driving the gear block plate to move in the direction of the clutch, thereby achieving the purpose of starting the clutch.

[0012] 2. This utility model utilizes high-pressure steam passing through the high-pressure steam inlet and igniting the first gas chamber, which drives the four sets of front impellers in the first gas chamber to rotate clockwise together, thereby driving the first rotating shaft to rotate synchronously. At this time, the gear at the front end of the first rotating shaft rotates, driving the gear block plate to move in the direction of the clutch, thereby achieving the purpose of starting the clutch.

[0013] 3. In this utility model, by switching the motor to rotate the first shaft clockwise, the gear can rotate while driving the gear plate to move in the direction of the clutch, and by rotating the first shaft counterclockwise, the gear can rotate while driving the gear plate to move in the opposite direction, which facilitates the motor to drive the clutch.

[0014] 4. This utility model adopts a coaxial connection between a steam turbine and an electric motor to jointly drive the same load. When the steam source is sufficient, high-pressure steam and low-pressure steam can be used to enter and exit the steam turbine chamber to drive the shaft to rotate, thereby pulling the clutch to open and close. When the steam source is insufficient, the electric motor is started to drive the clutch to run, which facilitates flexible dual-drive of steam and electricity, ensures safe operation and energy saving, and is more flexible, efficient and practical. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model; Figure 2 This is a schematic diagram of a steam turbine according to an embodiment of the present utility model; Figure 3 This is a schematic cross-sectional view of the steam turbine according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the clutch according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the toothed strip structure according to an embodiment of the present utility model.

[0016] In the diagram: 1. Steam turbine; 10. First shaft; 11. First gas chamber; 12. Front impeller; 13. High-pressure steam inlet; 14. High-pressure steam outlet; 15. Second gas chamber; 16. Rear impeller; 17. Low-pressure steam inlet; 18. Low-pressure steam outlet; 19. Gear; 2. Clutch; 20. Insertion hole; 21. Driven shaft; 22. Spring; 23. Rear sleeve; 24. Crankshaft; 25. Driven sleeve; 3. Gear block plate; 30. Pull shaft; 4. Electric motor. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Specific details such as particular system structures and technologies are provided to facilitate a more thorough understanding of the embodiments of this utility model. The described embodiments are some, but not all, of the embodiments disclosed herein. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0018] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0019] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model. Figure 2 This is a schematic diagram of the steam turbine according to an embodiment of the present utility model. Figure 3 This is a schematic cross-sectional view of the steam turbine according to an embodiment of the present utility model. Figure 4 This is a schematic diagram of the clutch according to an embodiment of the present utility model. Figure 5 This is a schematic diagram of the toothed strip structure according to an embodiment of the present utility model.

[0020] Reference Figures 1 to 5 As shown, this utility model provides a dual-drive switching clutch for a heating unit's induced draft fan, comprising a steam turbine 1 and a gear plate 3. The center of the steam turbine 1 is rotatably connected to a first rotating shaft 10, and a gear 19 is installed at the front end of the first rotating shaft 10. The other end of the first rotating shaft 10 is installed at the front end of a motor 4. The gear 19 meshes with the gear blocks on the upper side of the gear plate 3. A pull shaft 30 is provided at the front of the lower end of the gear plate 3. The pull shaft 30 is inserted into the insertion hole 20 opened on the driven sleeve 25 in the middle of the clutch 2, and the driven sleeve 25 is fitted onto the driven shaft 21.

[0021] In this embodiment, a first air chamber 11 is provided at the front of the steam turbine 1, and a front impeller 12 is movably rotated clockwise inside the first air chamber 11, with the center of the front impeller 12 fitted on the first rotating shaft 10; a high-pressure steam outlet 14 is provided on the upper front side of the first air chamber 11, and a high-pressure steam inlet 13 is provided on the upper rear side of the first air chamber 11.

[0022] In a preferred embodiment, this utility model utilizes high-pressure steam passing through the high-pressure steam inlet 13 and igniting the first gas chamber 11, which drives the four sets of front impellers 12 in the first gas chamber 11 to rotate clockwise together, thereby driving the first rotating shaft 10 to rotate synchronously. At this time, the gear 19 at the front end of the first rotating shaft 10 rotates, driving the gear block plate 3 to move towards the clutch 2, thereby achieving the purpose of starting the clutch.

[0023] In this embodiment, a second air chamber 15 is provided in the rear part of the steam turbine 1, and a rear impeller 16 is rotated counterclockwise in the second air chamber 15, and the center of the rear impeller 16 is sleeved on the first rotating shaft 10; a low-pressure steam inlet 17 is provided on the upper front side of the second air chamber 15, and a low-pressure steam outlet 18 is provided on the upper rear side of the second air chamber 15.

[0024] In a preferred embodiment, the present invention introduces low-pressure steam through the low-pressure steam inlet 17, which drives the four sets of rear impellers 16 in the second gas chamber 15 to rotate counterclockwise, thereby driving the first rotating shaft 10 to move synchronously. At this time, the gear 19 at the front end of the first rotating shaft 10 will drive the toothed plate 3 to move in the opposite direction away from the clutch 2, driving the driven sleeve 25 and spring 22 to move in the opposite direction on the driven shaft 21, thereby achieving the purpose of closing the clutch.

[0025] In this embodiment, a crankshaft 24 is installed in the middle of the front part of the clutch 2, and the centers of the crankshaft 24 and the driven shaft 21 are located on the same axis. A spring 22 is sleeved on the driven shaft 21, and the front and rear ends of the spring 22 abut against the driven sleeve 25 and the rear sleeve plate 23, respectively.

[0026] In a preferred embodiment, by switching the motor 4 to rotate the first shaft 10 clockwise, the gear 19 can rotate while driving the toothed plate 3 to move in the direction of the clutch 2, and by rotating the first shaft 10 counterclockwise, the gear 19 can rotate while driving the toothed plate 3 to move in the opposite direction, which facilitates the motor driving the clutch.

[0027] This invention effectively solves the problems of existing pneumatically driven clutches, which are difficult to continuously drive when encountering insufficient energy and are also easily affected by temperature to maintain normal operating temperature. This invention uses a steam turbine and an electric motor connected coaxially to drive the same load. When the steam source is sufficient, high-pressure steam and low-pressure steam can be used to drive the shaft to rotate, thereby pulling the clutch to open and close. When the steam source is insufficient, the electric motor is started to drive the clutch, which facilitates flexible dual-drive of steam and electricity, ensuring safe operation and energy saving, and is more flexible, efficient and practical.

[0028] The above embodiments are used to explain and illustrate the present utility model, and are not intended to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A dual-drive (steam-electric) switching clutch for a heating unit's induced draft fan, characterized in that: The device includes a steam turbine (1) and a toothed plate (3). The center of the steam turbine (1) is rotatably connected to a first rotating shaft (10), and a gear (19) is installed at the front end of the first rotating shaft (10). The other end of the first rotating shaft (10) is installed at the front end of a motor (4). The gear (19) meshes with the toothed blocks on the upper side of the toothed plate (3). A pull shaft (30) is provided at the front of the lower end of the toothed plate (3). The pull shaft (30) is inserted into the insertion hole (20) on the driven sleeve (25) in the middle of the clutch (2), and the driven sleeve (25) is fitted onto the driven shaft (21).

2. The dual-drive power switching clutch for a heating unit induced draft fan according to claim 1, characterized in that, The steam turbine (1) has a first air chamber (11) at the front, and a front impeller (12) is rotated clockwise inside the first air chamber (11), and the center of the front impeller (12) is fitted on the first rotating shaft (10).

3. The dual-drive power switching clutch for a heating unit induced draft fan according to claim 2, characterized in that, The first gas chamber (11) has a high-pressure steam outlet (14) on the upper front side and a high-pressure steam inlet (13) on the upper rear side.

4. The dual-drive power switching clutch for a heating unit induced draft fan according to claim 1, characterized in that, The turbine (1) has a second air chamber (15) in the rear part, and a rear impeller (16) rotates counterclockwise in the second air chamber (15), and the center of the rear impeller (16) is fitted on the first rotating shaft (10).

5. A dual-drive switching clutch for a heating unit's induced draft fan according to claim 4, characterized in that, The upper front part of the second gas chamber (15) is provided with a low-pressure steam inlet (17), and the upper rear part of the second gas chamber (15) is provided with a low-pressure steam outlet (18).

6. The dual-drive power switching clutch for a heating unit induced draft fan according to claim 1, characterized in that, A crankshaft (24) is installed in the middle of the front part of the clutch (2), and the centers of the crankshaft (24) and the driven shaft (21) are located on the same axis. A spring (22) is placed on the outer sleeve of the driven shaft (21), and the front and rear ends of the spring (22) abut against the driven sleeve (25) and the rear sleeve plate (23) respectively.

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