An Improved Structure for the Hydraulic Cylinder Bearing of a TLT Dynamic Adjustable Axial Flow Fan

Abstract

This utility model relates to the field of axial flow fan technology, and particularly to an improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan. This structure solves the problem that damage to the feedback bearing in the hydraulic cylinder of a TLT dynamically adjustable axial flow fan will cause the fan to stop operating. The improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan includes a feedback shaft, a linear bearing housing, and a double-row ball bearing. An integrally formed mounting rod with a diameter smaller than the feedback shaft body is located at the front end of the feedback shaft. The front section of the mounting rod has a fastening thread, and the frontmost end of the mounting rod has a connecting square post. The linear bearing housing has a cylindrical structure. The inner ring of the double-row ball bearing is fitted and fixed to the outer cylindrical surface of the linear bearing housing. A fastening nut is screwed onto the fastening thread of the mounting rod, and the fastening nut presses against the end face of the inner ring of the double-row ball bearing. This utility model can reduce the failure rate of the hydraulic cylinder of a TLT dynamically adjustable axial flow fan.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, and in particular to an improved structure of the hydraulic cylinder bearing for a TLT dynamically adjustable axial flow fan. Background Technology

[0002] Adjustable axial flow fans are important auxiliary equipment in thermal power plant units, and the hydraulic cylinder is the core component of the adjustable axial flow fan. Statistics show that fan failures caused by damage to the feedback bearing of the hydraulic cylinder in TLT (Temperature-Adjustable Axial Flow Fan) are frequent and increasing year by year. Damage to the feedback bearing of the hydraulic cylinder in TLT dynamically adjustable axial flow fans will cause the fan to be taken out of service, and in severe cases, it will cause the generator unit to trip. This problem has become a hidden danger to the safe and stable operation of TLT dynamically adjustable axial flow fans, necessitating research into the operating condition of the feedback bearing in the hydraulic cylinder of TLT dynamically adjustable axial flow fans to improve operational reliability.

[0003] Therefore, an improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan is proposed. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that damage to the feedback bearing of the hydraulic cylinder of the TLT dynamically adjustable axial flow fan will cause the dynamically adjustable axial flow fan to stop operating. This utility model provides an improved structure for the bearing of the hydraulic cylinder of the TLT dynamically adjustable axial flow fan.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] An improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan includes a feedback shaft, a linear bearing housing, and a double-row ball bearing.

[0007] The front end of the feedback shaft has an integrally formed mounting rod with a diameter smaller than that of the feedback shaft body;

[0008] The front section of the mounting rod is provided with a fastening thread, and the front end of the mounting rod is provided with a square post for connection;

[0009] The linear bearing housing is a cylindrical structure, with its inner hole fitted onto the mounting rod, and one end face abutting against the stepped surface formed by the feedback shaft body and the mounting rod.

[0010] The inner ring of the double-row ball bearing is fitted onto and fixed to the outer cylindrical surface of the linear bearing housing.

[0011] A fastening nut is screwed onto the fastening thread of the mounting rod. The fastening nut presses against the inner ring end face of the double-row ball bearing, axially fixing the linear bearing housing and the double-row ball bearing between the stepped surface of the feedback shaft and the fastening nut.

[0012] As an improvement, the outer diameter of the linear bearing housing is the same as the diameter of the feedback shaft.

[0013] As an improvement, an anti-loosening washer is provided between the fastening nut and the inner ring end face of the double-row ball bearing.

[0014] As an improvement, the inner hole of the linear bearing housing and the mounting rod are in a transition fit.

[0015] The beneficial effects of this utility model are as follows: by adding a linear bearing housing and bearing installation method, replacing the same series bearing with a larger load, enlarging the inner hole of the linear bearing housing connected to it, increasing the dynamic load force, avoiding early failure due to off-center load, and reducing the failure rate of the hydraulic cylinder of the TLT dynamic axial flow fan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0017] Figure 2 This is a sectional view of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of this utility model;

[0019] Reference numerals in the attached diagram: 1. Feedback shaft; 2. Linear bearing housing; 3. Double row ball bearing; 4. Mounting rod; 5. Fastening thread; 6. Square column; 7. Fastening nut; 8. Anti-loosening washer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Reference Figure 1-3 An improved bearing structure for a TLT dynamically adjustable axial flow fan hydraulic cylinder is provided, wherein the front end of the feedback shaft 1 is integrally formed with a mounting rod 4, the diameter of which is smaller than the diameter of the feedback shaft 1 body, forming an axial positioning step surface.

[0025] The front section of the mounting rod 4 is machined with fastening threads 5, and the front end is provided with a square post 6 for connecting an external actuator.

[0026] The linear bearing housing 2 adopts a T-shaped cylindrical structure, with its inner hole sleeved on the outer surface of the mounting rod 4. The inner hole and the mounting rod 4 are fitted with a transition fit to ensure assembly accuracy. One end face of the linear bearing housing 2 is tightly pressed against the stepped surface formed by the feedback shaft 1 and the mounting rod 4 to achieve axial positioning. The outer diameter of the linear bearing housing 2 is the same as the diameter of the feedback shaft 1 to ensure the coaxiality and appearance consistency of the overall structure.

[0027] The inner ring of the double-row ball bearing 3 is interference-fitted or heat-fitted onto the outer cylindrical surface of the linear bearing housing 2 to achieve radial fixation. The double-row ball design can withstand bidirectional axial force, thereby improving the bearing's load-bearing capacity.

[0028] The fastening nut 7 is screwed onto the fastening thread 5 of the mounting rod 4 and pressed against the inner ring end face of the double row ball bearing 3. An anti-loosening washer 8 is added between the fastening nut 7 and the inner ring end face of the bearing to prevent the nut from loosening. By tightening the nut, the linear bearing housing 2 and the double row ball bearing 3 are axially pressed and fixed between the stepped surface of the feedback shaft 1 and the nut, eliminating axial clearance.

[0029] In specific implementation cases, a bearing of the same series with a larger load capacity (such as 3201-BB-2Z-TVH) is selected, and the inner hole size of the linear bearing housing 2 connected to it is enlarged to increase the dynamic load and reduce the failure rate of the hydraulic cylinder of the TLT dynamically adjustable axial flow fan. The linear bearing housing 2 is fitted into the mounting rod 4 of the feedback shaft 1 until one end is tightly attached to the stepped surface of the feedback shaft 1 body and the mounting rod 4. The inner ring of the double row ball bearing 3 is fitted into the outer cylindrical surface of the linear bearing housing 2, ensuring that the end face of the bearing inner ring is flush with the end face of the linear bearing housing 2. Anti-loosening washers 8 and fastening nuts 7 are placed in sequence on the fastening threads 5 of the mounting rod 4, and the fastening nuts 7 are tightened to the specified torque to make the inner ring of the double row ball bearing 3 axially pressed, thus completing the fixing of the bearing assembly.

Claims

1. An improved bearing structure for a hydraulic cylinder of a TLT dynamically adjustable axial flow fan, characterized in that, Includes a feedback shaft (1), a linear bearing housing (2), and a double-row ball bearing (3); The front end of the feedback shaft (1) is integrally formed with a mounting rod (4) with a diameter smaller than that of the body of the feedback shaft (1); The front section of the mounting rod (4) is provided with a fastening thread (5), and the front end of the mounting rod (4) is provided with a connecting square post (6); The linear bearing housing (2) is a cylindrical structure, with its inner hole sleeved on the mounting rod (4), and one end face abutting against the stepped surface formed by the feedback shaft (1) body and the mounting rod (4); The inner ring of the double-row ball bearing (3) is fitted onto and fixed to the outer cylindrical surface of the linear bearing housing (2); A fastening nut (7) is screwed onto the fastening thread (5) of the mounting rod (4). The fastening nut (7) is pressed against the inner ring end face of the double row ball bearing (3), thereby axially fixing the linear bearing seat (2) and the double row ball bearing (3) between the stepped surface of the feedback shaft (1) and the fastening nut (7).

2. The improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan according to claim 1, characterized in that, The outer diameter of the linear bearing housing (2) is the same as the diameter of the feedback shaft (1).

3. The improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan according to claim 1, characterized in that, An anti-loosening washer (8) is provided between the fastening nut (7) and the inner ring end face of the double row ball bearing (3).

4. The improved bearing structure for the hydraulic cylinder of a TLT dynamically adjustable axial flow fan according to claim 1, characterized in that, The inner hole of the linear bearing housing (2) and the mounting rod (4) are in transition fit.

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