Blade adjusting device for induced draft fan of thermal power station
By setting the end shaft and the boss at the connection between the mandrel and the adjustment disc of the induced fan, the problem of unstable connection in the prior art is solved, a more stable connection is achieved, and the reliability and service life of the equipment are improved.
Patent Information
- Application Number
- CN202421452446.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-25
AI Technical Summary
The existing air induced movement mandrel shaft is unstable and can easily fall off after long-term use, resulting in equipment failure.
By setting the end shaft, the diameter at the connection between the mandrel and the adjustment disc can be larger, and a larger bolt can be connected. By setting the boss, the adjustment disc has sufficient thickness to connect the end shaft, thereby increasing the contact surface and improving the connection stability.
The mandrel and the adjustment disc are achieved, which avoids the risk of falling off after long-term use and improves the reliability and service life of the equipment.
Smart Images
Figure CN222633498U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of induced draft fans, in particular to a blade regulating device for an induced draft fan in a thermal power station. Background Art
[0002] Boiler induced draft fans play an indispensable role in the operation of generator sets in thermal power plants. During the use of induced draft fans, the blade angles of the induced draft fans need to be adjusted. The adjustment method is that the hydraulic system of the induced draft fan pushes the core shaft to move back and forth, and the core shaft drives the adjusting disk to reciprocate to achieve blade angle adjustment. The connection between the existing induced draft fan core shaft and the adjusting disk is not stable. After long-term use, the adjusting disk is easy to fall off the core shaft, causing equipment failure. Utility Model Content
[0003] The main purpose of the utility model is to provide a blade adjustment device for an induced draft fan of a thermal power station, so as to solve the problem of unstable connection between the induced draft fan core shaft and the adjustment disk in the above-mentioned prior art.
[0004] In order to achieve the above-mentioned purpose, the utility model provides a blade adjustment device for an induced draft fan in a thermal power plant, comprising an impeller, on which a plurality of blades are connected; a cavity is provided inside the impeller, an adjustment disk for adjusting the blade angle is provided in the cavity, and the adjustment disk is fixedly connected to a core shaft for driving the adjustment disk to reciprocate; an end shaft is provided at one end where the core shaft is connected to the impeller, the diameter of the end shaft is larger than the diameter of other parts of the core shaft, a connecting groove matching the end shaft is provided on one side of the adjusting disk, the end shaft and the connecting groove are connected by bolts, and the bolts are arranged along the axial direction of the core shaft.
[0005] Furthermore, a boss is provided at a position on the other side of the adjusting disk opposite to the connecting groove.
[0006] Furthermore, the end shaft and the core shaft are coaxially arranged.
[0007] Furthermore, the outer ring of the adjusting disk is provided with a groove, one end of the blade is connected to a crank arm, and the other end of the crank arm is located in the groove.
[0008] Furthermore, the core shaft is movably connected to the impeller, the core shaft is connected to a first power mechanism for driving the core shaft to reciprocate; the impeller is connected to a second power mechanism for driving the impeller to rotate.
[0009] The utility model can make the diameter of the connection between the core shaft and the adjusting disk larger by setting the end shaft, can connect bolts with larger specifications, and the contact surface between the core shaft and the adjusting disk is wider, so that the connection between the core shaft and the adjusting disk is more stable; by setting the boss, the adjusting disk has enough thickness to connect the end shaft, so that the thickness of the end shaft can also be set large enough, so that the connection between the core shaft and the adjusting disk is more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0011] Figure 1 It is a structural schematic diagram of a blade adjustment device for an induced draft fan in a thermal power station in the prior art;
[0012] Figure 2 It is a partial cutaway schematic diagram of a blade adjustment device for an induced draft fan in a thermal power station in the prior art;
[0013] Figure 3 It is a partial cross-sectional schematic diagram of an embodiment of the present application.
[0014] In the figure: 1, impeller; 2, blades; 3, adjusting plate; 301, connecting groove; 302, boss; 4, core shaft; 401, end shaft; 5, bolt; 6, crank arm. DETAILED DESCRIPTION
[0015] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0016] like Figure 1-Figure 2 As shown, in the prior art, a blade adjustment device for an induced draft fan in a thermal power plant comprises an impeller 1, to which a plurality of blades 2 are connected; a cavity is provided inside the impeller 1, in which an adjustment disk 3 for adjusting the blade angle is provided, and the adjustment disk 3 is fixedly connected to a core shaft 4 for driving the adjustment disk 3 to reciprocate via a bolt 5; the bolt 5 is an 8.8-grade M16 hexagon socket bolt; a groove is provided on the outer ring of the adjustment disk 3, one end of the blade 2 is connected to a crank arm 6, and the other end of the crank arm 6 is located in the groove.
[0017] The core shaft 4 is movably connected to the impeller 1 . The core shaft 4 is connected to a hydraulic cylinder for driving the core shaft 4 to reciprocate. The impeller 1 is connected to a motor for driving the impeller 1 to rotate.
[0018] When the core shaft 4 drives the adjusting disk 3 to reciprocate, the crank arm 6 swings the blade 2 to change the angle of the blade 2 .
[0019] Example
[0020] like Figure 3 As shown, a blade adjustment device for an induced draft fan in a power station comprises an impeller 1, to which a plurality of blades 2 are connected; a cavity is provided inside the impeller 1, in which an adjustment disk 3 for adjusting the blade angle is provided, and the adjustment disk 3 is fixedly connected to a core shaft 4 for driving the adjustment disk 3 to reciprocate; a groove is provided on the outer ring of the adjustment disk 3, one end of the blade 2 is connected to a crank arm 6, and the other end of the crank arm 6 is located in the groove.
[0021] The core shaft 4 is movably connected to the impeller 1 . The core shaft 4 is connected to a hydraulic cylinder for driving the core shaft 4 to reciprocate. The impeller 1 is connected to a motor for driving the impeller 1 to rotate.
[0022] An end shaft 401 is coaxially arranged at one end where the core shaft 4 is connected to the impeller 1. The diameter of the end shaft 401 is larger than the diameter of the other parts of the core shaft 4. A connecting groove 301 matching the end shaft 401 is provided on one side of the adjusting disk 3. The end shaft 401 and the connecting groove 301 are connected by bolts 5. The bolts 5 are arranged along the axial direction of the core shaft 4. The bolts 5 are 12.9 grade M20 hexagon socket bolts.
[0023] A boss 302 is provided at the other side of the adjusting disk 3 opposite to the connecting groove 301 .
[0024] By setting the end shaft 401, the above-mentioned embodiment can make the diameter of the connection between the core shaft 4 and the adjusting disk 3 larger, and can connect bolts 5 of larger specifications, and the contact surface between the core shaft 4 and the adjusting disk 3 is wider, so that the connection between the core shaft 4 and the adjusting disk 3 is more stable; by setting the boss 302, the adjusting disk 3 has sufficient thickness to connect with the end shaft 401, so that the thickness of the end shaft 401 can also be set large enough, so that the connection between the core shaft 4 and the adjusting disk 3 is more stable and not easy to fall off and separate.
[0025] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A blade adjustment device for an induced draft fan of a thermal power station, comprising an impeller (1), wherein a plurality of blades (2) are connected to the impeller (1); a cavity is provided inside the impeller (1), wherein an adjustment disk (3) for adjusting the blade angle is provided inside the cavity, and wherein the adjustment disk (3) is fixedly connected to a core shaft (4) for driving the adjustment disk (3) to reciprocate; wherein: An end shaft (401) is provided at one end of the core shaft (4) connected to the impeller (1); the diameter of the end shaft (401) is larger than the diameter of other parts of the core shaft (4); a connecting groove (301) matching with the end shaft (401) is provided on one side of the adjusting disk (3); the end shaft (401) and the connecting groove (301) are connected by bolts (5); and the bolts (5) are arranged along the axial direction of the core shaft (4).
2. The blade adjustment device for the induced draft fan of a thermal power plant according to claim 1, characterized in that: A boss (302) is provided on the other side of the adjustment disk (3) at a position opposite to the connection groove (301).
3. The blade adjustment device for the induced draft fan of a thermal power plant according to claim 1, characterized in that: The end shaft (401) and the core shaft (4) are coaxially arranged.
4. The blade adjustment device for the induced draft fan of a thermal power station according to claim 1, characterized in that: The outer ring of the adjusting disk (3) is provided with a groove, one end of the blade (2) is connected to a crank arm (6), and the other end of the crank arm (6) is located in the groove.
5. The blade adjustment device for the induced draft fan of a thermal power station according to claim 1, characterized in that: The core shaft (4) is movably connected to the impeller (1); the core shaft (4) is connected to a first power mechanism for driving the core shaft (4) to reciprocate; and the impeller (1) is connected to a second power mechanism for driving the impeller (1) to rotate.