A fan transmission shaft connection assembly and installation method

Abstract

The invention relates to a fan transmission shaft connection assembly; the assembly comprises a bolt (2), a slotted outer tapered sleeve (3), a slotted inner tapered sleeve (4), and a clamping sleeve (5); the slotted inner tapered sleeve (4) is a stepped ring, the first section of which is a cylindrical surface and the second section is a conical surface in the circumferential direction; the inner diameter of the slotted inner tapered sleeve (4) matches the outer diameter of the cylindrical section of a coupling (1); through holes are distributed axially on the first section; the outer diameter of the slotted outer tapered sleeve (3) matches the inner diameter of a steel pipe (6), and the inner surface is a conical surface; the left end surface of the slotted outer tapered sleeve (3) is fitted to the right end surface of the first section of the cylindrical surface of the slotted inner tapered sleeve (4); the clamping sleeve (5) has a threaded through hole in the axial direction, and the inner and outer surfaces are both conical surfaces, which are respectively consistent with the angle of the second section of the conical surface of the slotted inner tapered sleeve (4) and the inclination angle of the inner surface of the slotted outer tapered sleeve (3); the assembly realizes the rigid connection between the coupling and the steel pipe by generating pressure on the inner wall of the steel pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of structural design, and relates to a fan transmission shaft connection assembly and an installation method, and is specifically applied to the connection between a fan transmission shaft steel pipe part and a coupling part. Background Art

[0002] At present, the cooling water treatment capacity of large domestic enterprises such as petroleum, chemical, electric power, and metallurgy is increasing year by year, and the application of cooling tower fans is also increasing. The drive shaft is an important accessory in the cooling tower fan, and its reliability is an important factor in ensuring that the fan can operate continuously, smoothly, and reliably. At present, most drive shaft connection structures are mostly welded (see Figure 1 ), this connection form requires the processing of the shaft head of the part. After the shaft head is welded to the steel pipe, the torque is transmitted and connected to the coupling through the key on the shaft head. Due to the high temperature during welding, the welding point is very prone to heat deformation, and multiple corrections are required after welding. The processing procedures of this structure are cumbersome, the production efficiency is low, the cycle is long, and it brings inconvenience to the later maintenance, which greatly increases the production cost. In order to reduce costs and improve processing efficiency, it is a need of practical engineering and the market to research and develop a fan drive shaft connection structure that is easy to produce and process, has high reliability, low cost, and convenient maintenance. The new drive shaft connection structure does not require key connection or welding to connect the drive shaft steel pipe part and the coupling part. The structure has the characteristics of simple structure, high centering degree, and easy assembly and disassembly. Summary of the invention

[0003] The purpose of the present invention is to provide a fan drive shaft connection assembly and an installation method to achieve a fan drive shaft connection structure with convenient installation and disassembly, reliable clamping and high centering degree.

[0004] To solve this technical problem, the technical solution of the present invention is:

[0005] A fan transmission shaft connection assembly, the assembly comprising a bolt 2, a slotted outer cone sleeve 3, a slotted inner cone sleeve 4, and a tightening sleeve 5; used for connecting a coupling 1 and a steel pipe 6;

[0006] The slotted inner tapered sleeve 4 is sleeved on the end of the outer side wall of the cylindrical section of the coupling 1;

[0007] The slotted inner tapered sleeve 4 is a circular ring with steps, the first section of which is a cylindrical surface and the second section is a conical surface in the circumferential direction; the inner diameter of the slotted inner tapered sleeve 4 matches the outer diameter of the cylindrical section of the coupling 1;

[0008] The first section of the slotted inner cone sleeve 4 has an axially distributed through hole φH, and the distance G from the central axis of the through hole to the outer side surface of the first section of the cylindrical surface is 15 to 20 mm;

[0009] The slotted outer cone sleeve 3: the outer diameter matches the inner diameter of the steel pipe 6, and the inner surface is a cone surface; the left end surface of the slotted outer cone sleeve 3 fits the right end surface of the first cylindrical section of the slotted inner cone sleeve 4;

[0010] The expansion sleeve 5 has a threaded through hole M in the axial direction for matching with the bolt 2; the inner and outer surfaces are both conical surfaces, and the cross-section is trapezoidal; the inner surface inclination angle γ is consistent with the angle α of the second section of the conical surface of the slotted inner tapered sleeve 4, and the outer surface inclination angle δ is consistent with the inner surface inclination angle β of the slotted outer tapered sleeve 3.

[0011] The thickness E of the second section of the conical surface of the slotted inner cone sleeve 4 accounts for 70-75% of the total thickness F of the ring.

[0012] The cone angle α of the second section of the conical surface of the slotted inner cone sleeve 4 ranges from 12.5° to 13.5°; preferably, the cone angle α is 13°.

[0013] The cone angle β of the inner surface of the slotted outer cone sleeve 3 ranges from 12.5° to 13.5°; the cone angle β is 13°.

[0014] The diameter of the bolt 2 accounts for 5 to 6% of the diameter φL of the left end surface circle of the expansion sleeve 5.

[0015] The slotted outer cone sleeve 3, the slotted inner cone sleeve 4 and the expansion sleeve 5 are made of international alloy structural steel 40Cr, and the standard is GB / T3077-19994.

[0016] The installation method of the fan drive shaft connection assembly is as follows:

[0017] First, the slotted inner cone sleeve 4 is connected to the expansion sleeve 5 by bolts 2;

[0018] Secondly, the outer conical surface of the expansion sleeve 5 is matched with the conical surface of the slotted outer conical sleeve 3 to form an integral structure;

[0019] Finally, the outer diameter of the slotted outer cone sleeve 3 in the above overall structure is matched with the inner diameter of the steel pipe 6 for installation.

[0020] The beneficial effects of the present invention are as follows: the connection structure mainly generates pressure on the outer circle of the coupling and the inner wall of the steel pipe by tightening the hexagon socket bolt to make the conical surface of the expansion sleeve extend along the conical surfaces of the slotted outer tapered sleeve and the slotted inner tapered sleeve, after the coupling is subjected to the pressure of the slotted inner tapered sleeve, the coupling and the slotted inner tapered sleeve are tightly embraced, after the slotted outer tapered sleeve is subjected to the pressure of the expansion sleeve, the slotted outer tapered sleeve expands outward, and then generates pressure on the inner wall of the steel pipe, thereby realizing the overall rigid connection between the coupling and the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions implemented in the present invention, the following is a brief explanation of the drawings required to be used in the examples of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the welding structure installation;

[0023] Figure 2 is a schematic diagram of the connection structure;

[0024] Figure 3 This is a schematic diagram of a slotted outer cone sleeve. Figure 3 (a) in the equation is Figure 3 (b) Sectional view of AA;

[0025] Figure 4 This is a schematic diagram of a slotted inner cone sleeve. Figure 4 (a) in the equation is Figure 4 (b) Cross-sectional view of BB;

[0026] Figure 5 This is a schematic diagram of the expansion sleeve. Figure 5 (a) in the equation is Figure 5 (b) Cross-sectional view of CC;

[0027] Among them, 1-coupling, 2-bolt, 3-slotted outer tapered sleeve, 4-slotted inner tapered sleeve, 5-expansion sleeve, 6-steel pipe, 7-key and 8-shaft head. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The features of various aspects of the embodiments of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to fully understand the present invention. However, it is obvious to those skilled in the art that the present invention can also be implemented without these specific details. The following description of the embodiments is only for a better understanding of the present invention by illustrating examples of the present invention. The present invention is not limited to any specific settings and methods provided below, but covers all product structures, any improvements, replacements, etc. of methods covered without departing from the spirit of the present invention.

[0030] In the various drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.

[0031] like Figure 2 As shown, the fan drive shaft connection assembly consists of a bolt 2, a slotted outer cone sleeve 3, a slotted inner cone sleeve 4, and a tightening sleeve 5. Except for the bolt 2, the other parts are made of 40Cr. 40Cr steel is one of the most widely used steels in the machinery manufacturing industry and has good comprehensive mechanical properties after quenching and tempering.

[0032] Figure 3 An open groove with a width of 4 mm is processed on the slotted outer tapered sleeve 3, and the inner surface cone angle β is 13°; by tightening the bolt 2, the outer surface cone surface of the expansion sleeve 5 generates pressure on the cone surface of the slotted outer tapered sleeve 3, and then the outer cylindrical surface of the slotted outer tapered sleeve 3 generates pressure on the inner wall of the steel pipe 6, and the pressure can expand the slotted outer tapered sleeve 3 and the inner wall of the steel pipe 6.

[0033] Figure 4 , 6 through holes of φ13mm are axially distributed on the first section of the slotted inner tapered sleeve 4, the distance G from the central axis of the through hole to the outer side surface of the first section of the cylindrical surface is 16mm, and the cone angle α of the cone surface is 13°; an open groove with a width of 4mm is processed on the slotted inner tapered sleeve 4, and by tightening the bolt 2, the inner surface conical surface of the expansion sleeve 5 generates pressure on the conical surface of the slotted inner tapered sleeve 4, and then the inner hole surface of the slotted inner tapered sleeve 4 generates pressure on the contact part of the outer cylindrical surface of the coupling 1, and the pressure can make the slotted inner tapered sleeve 4 and the coupling 1 hold tightly.

[0034] Figure 5 , there are 6 M12mm threaded through holes evenly distributed in the axial direction of the expansion sleeve 5, and the inner and outer conical surfaces of the expansion sleeve 5 are both 13°. When tightening the bolt 2, the inner and outer conical surfaces of the expansion sleeve 5 slide along the conical surfaces of the slotted outer conical sleeve 3 and the slotted inner conical sleeve 4, thereby generating both inward and outward pressure. Due to the generation of sufficient inward and outward pressure, a rigid structure that is integrally connected with the coupling 1 and the steel pipe 6 is achieved.

[0035] By tightening the bolt 2, the transmission shaft connection assembly generates a tightening pressure of ≥100N / mm on the outer surface of the coupling 1 and the inner surface of the steel pipe 6 2 , fully meeting the use requirements.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A fan drive shaft connection assembly, characterized in that: The assembly comprises a bolt (2), a slotted outer tapered sleeve (3), a slotted inner tapered sleeve (4), and a tightening sleeve (5); and is used for connecting a coupling (1) and a steel pipe (6); The slotted inner tapered sleeve (4) is mounted on the outer wall end of the cylindrical section of the coupling (1); The slotted inner tapered sleeve (4) is a circular ring with a step, the first section of which is a cylindrical surface and the second section is a conical surface in the circumferential direction; the inner diameter of the slotted inner tapered sleeve (4) matches the outer diameter of the cylindrical section of the coupling (1); The first section of the slotted inner cone sleeve (4) has an axially distributed through hole φH, and the distance G from the central axis of the through hole to the outer side surface of the first section of the cylindrical surface is 15 to 20 mm; The slotted outer tapered sleeve (3) has an outer diameter that matches the inner diameter of the steel pipe (6) and an inner surface that is a tapered surface; the left end surface of the slotted outer tapered sleeve (3) fits the right end surface of the first cylindrical section of the slotted inner tapered sleeve (4); The expansion sleeve (5) has a threaded through hole M in the axial direction for cooperating with the bolt (2); the inner and outer surfaces are both conical surfaces, and the cross section is trapezoidal; the inner surface inclination angle γ is consistent with the angle α of the second conical surface of the slotted inner tapered sleeve (4); the outer surface inclination angle δ is consistent with the inner surface inclination angle β of the slotted outer tapered sleeve (3); The thickness E of the second conical surface of the slotted inner cone sleeve (4) accounts for 70 to 75% of the total thickness F of the ring; The cone angle α of the second conical surface of the slotted inner cone sleeve (4) ranges from 12.5° to 13.5°; The cone angle β of the inner surface of the slotted outer cone sleeve (3) ranges from 12.5° to 13.5°.

2. The fan drive shaft coupling assembly according to claim 1, characterized in that: The diameter of the bolt (2) accounts for 5 to 6% of the diameter φL of the left end face circle of the expansion sleeve (5).

3. The fan drive shaft connection assembly according to claim 1, characterized in that: The slotted outer cone sleeve (3), the slotted inner cone sleeve (4) and the expansion sleeve (5) are all made of structural steel 40Cr, and the standard GB / T3077-19994 is implemented.

4. The fan drive shaft coupling assembly according to claim 1, characterized in that: The cone angle α is 13°.

5. The fan drive shaft coupling assembly according to claim 1, characterized in that: The cone angle β is 13°.

6. A method for installing a fan drive shaft connection assembly, installing the fan drive shaft connection assembly according to claim 1, characterized in that: The installation method is as follows: First, the slotted inner cone sleeve (4) is connected to the expansion sleeve (5) by means of bolts (2); Secondly, the outer conical surface of the expansion sleeve (5) and the conical surface of the slotted outer conical sleeve (3) are matched and installed together to form an integral structure; Finally, the outer diameter of the slotted outer cone sleeve (3) in the above overall structure is matched with the inner diameter of the steel pipe (6) for installation.

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