Replaceable turbine blade

Abstract

The utility model discloses a replaceable steam turbine blade, relates to the field of steam turbine blades, and aims to solve the problems that most existing steam turbine blades in the prior art are fixed on an outer shaft in a welding manner and cannot be detached, and the maintenance of the blades is troublesome when the blades need to be overhauled. A blade shaft sleeve is connected to the rotating shaft, the middle of the rotating shaft is sleeved with the blade shaft sleeve, the outer tooth part and the inner tooth part are connected in a meshed mode, a connecting pipe is fixedly connected to the front end of the blade shaft sleeve, and a plurality of turbine blades are connected to the end face of the outer side of the blade shaft sleeve in an annular array mode. The T-shaped inserting parts at the lower ends of the turbine blades slide into the T-shaped clamping grooves along the front end face of the blade shaft sleeve, the connecting positions of the turbine blades and the T-shaped inserting parts slide between the two clamping plates at the upper ends of the T-shaped clamping grooves, and the connecting positions of the turbine blades and the T-shaped inserting parts are fixedly connected with the two clamping plates through a plurality of second bolts.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of steam turbine blade, concretely is a replaceable steam turbine blade. BACKGROUND

[0002] Steam turbine blade is the key part in steam turbine, belongs to one of the most delicate, most important component. It works under extremely harsh conditions, needs to bear high temperature, high pressure, huge centrifugal force, steam force, steam excitation force, corrosion, vibration and wet steam area water drop erosion's joint action. The aerodynamic performance of blade, processing geometry, surface roughness, installation gap and operation condition etc. factors all influence the efficiency of steam turbine, its structure design, vibration intensity and operation mode play a decisive role to the safety reliability of unit. Therefore, the selection of blade material, manufacturing, processing and maintenance are very important.

[0003] For example, the authorization announcement number CN220539689U discloses a steam turbine blade, comprising blade root, blade type and surrounding band structure, the lower surface of the blade root is installed with the blade type, and the lower end of the blade type is installed with the surrounding band. The steam turbine blade adopts the concave-convex platform structure surrounding band, is convenient for positioning installation and has good effect, is more convenient when maintaining or replacing the blade, increases the rigidity of the blade, reduces the vibration stress, effectively improves the bearing capacity of load, and the efficiency is improved. The application of the series of blades will improve the service life of the steam turbine blade, and the steam turbine blade has good economic and safety security.

[0004] The existing steam turbine blade is mostly fixed on the rotating shaft through welding, cannot be disassembled, and is troublesome when needing to maintain and repair the blade, therefore, the market urgently needs to develop a replaceable steam turbine blade to help people solve the existing problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a replaceable steam turbine blade to solve the problem that the existing steam turbine blade is mostly fixed on the outer shaft through welding, cannot be disassembled, and is troublesome when needing to maintain and repair the blade in the above background technology.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a replaceable steam turbine blade, including rotating shaft, the rotating shaft is connected with blade shaft sleeve, the blade shaft sleeve front end fixedly connected with connecting pipe, the blade shaft sleeve outside end face is provided with the annular array of multiple T type clamping grooves, the blade shaft sleeve outside end face is fixedly connected with the clamping plate on each T type clamping groove both sides, and the blade shaft sleeve outside end face is connected with multiple steam turbine blades in annular array.

[0007] Preferably, the middle part of the rotating shaft outside end face is fixedly provided with an external tooth part, and the inner wall of the blade shaft sleeve is fixedly provided with an internal tooth part.

[0008] Preferably, the blade shaft sleeve is sleeved into the middle part of the rotating shaft and the outer tooth part is connected with the inner tooth part.

[0009] Preferably, a plurality of threaded holes are arranged on the front end of the middle part of the outer end surface of the rotating shaft, and the connecting pipe is sleeved on the rotating shaft and fixed by a plurality of first bolts penetrating through the connecting pipe and respectively inserted into the threaded holes.

[0010] Preferably, the T-shaped insertion part is arranged on the lower end of the steam turbine blade, and the front end and the rear end of the T-shaped clamping groove are respectively communicated with the front end and the rear end of the blade shaft sleeve.

[0011] Preferably, the T-shaped insertion part is arranged on the lower end of the steam turbine blade, and the front end and the rear end of the T-shaped clamping groove are respectively communicated with the front end and the rear end of the blade shaft sleeve.

[0012] Preferably, the T-shaped insertion part is arranged on the lower end of the steam turbine blade, and the front end and the rear end of the T-shaped clamping groove are respectively communicated with the front end and the rear end of the blade shaft sleeve.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] (1) In the utility model, the detachable connection structure between the blade shaft sleeve and the rotating shaft is designed, so that the blade shaft sleeve and the steam turbine blades thereon can be conveniently detached from the rotating shaft. Specifically, the inner tooth part arranged on the inner wall of the blade shaft sleeve is engaged with the outer tooth part arranged on the middle part of the outer end surface of the rotating shaft, so that the blade shaft sleeve can rotate synchronously with the rotating shaft. Meanwhile, the connecting pipe at the front end of the blade shaft sleeve is connected and fixed with the threaded holes on the outer end surface of the rotating shaft through a plurality of first bolts, so as to further ensure the stability of the blade shaft sleeve. When the blade needs to be overhauled or replaced, the first bolts are loosened, and the connecting pipe is pulled forward, so that the blade shaft sleeve is separated from the outer tooth part, and the blade shaft sleeve and all the blades thereon are easily detached. This design greatly simplifies the overhaul and maintenance process of the steam turbine blade, reduces the downtime, and improves the work efficiency.

[0015] (2) In the utility model, the steam turbine blade is quickly installed and detached through the T-shaped insertion part and the T-shaped clamping groove on the blade shaft sleeve. When the blade is installed, the T-shaped insertion part at the lower end of the blade is aligned with the T-shaped clamping groove on the blade shaft sleeve and is slid into the T-shaped clamping groove until the blade is in contact with the clamping plates on both sides. Then, the second bolts are used to tightly connect the blade with the clamping plates. When the blade needs to be replaced, the second bolts are loosened, and the blade is slid out of the T-shaped clamping groove, so that the blade is replaced. This design not only facilitates the individual replacement of the blade and reduces the maintenance cost, but also improves the speed and accuracy of the blade replacement.

[0016] (3) The utility model discloses, steam turbine blade and T type plug -in part junction of place with two clamps between through a plurality of second bolt fixed connection, through two clamps to steam turbine blade and T type plug -in part junction of place are fixed, when steam turbine blade rotates, two clamps can support the junction of place, improve the stability of junction of place. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the front view of a replaceable steam turbine blade of the utility model;

[0018] Figure 2 It is the main sectional view of the utility model;

[0019] Figure 3 It is the side sectional view of the utility model;

[0020] Figure 4 It is the A detail enlarged view of the utility model.

[0021] In the drawing: 1, rotation axis;101, outer tooth part;102, threaded hole;2, blade shaft sleeve;201, inner tooth part;202, connecting pipe;203, first bolt;204, T type clamping slot;205, clamp;3, steam turbine blade;301, T type plug -in part;302, second bolt. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments.

[0023] Please refer to Figures 1-4The utility model provides an embodiment: a replaceable steam turbine blade, including rotating shaft 1, the rotating shaft 1 is connected with blade shaft sleeve 2, and the middle part fixed setting of rotating shaft 1 outside end surface has outer gear portion 101, and the inner wall fixed setting of blade shaft sleeve 2 has inner gear portion 201, and blade shaft sleeve 2 is inserted into the middle part of rotating shaft 1 and makes the meshing connection between outer gear portion 101 and inner gear portion 201, can drive blade shaft sleeve 2 to rotate when rotating shaft 1 rotates, and blade shaft sleeve 2 front end fixed connection has connecting pipe 202, and the middle part front end annular array of rotating shaft 1 outside end surface is provided with a plurality of threaded holes 102, and connecting pipe 202 is inserted into rotating shaft 1 after being passed through a plurality of first bolts 203 and is respectively inserted into a plurality of threaded holes 102 inside screw thread connection fixed, after being fixed between connecting pipe 202 and rotating shaft 1, the position of blade shaft sleeve 2 is fixed, prevents blade shaft sleeve 2 from sliding on rotating shaft 1, simultaneously, a plurality of first bolts 203 are disassembled, connecting pipe 202 is pulled, and blade shaft sleeve 2 can be made to slide on rotating shaft 1 to the front by connecting pipe 202, so that outer gear portion 101 and inner gear portion 201 are separated, and blade shaft sleeve 2 can be disassembled and overhauled.

[0024] Please refer to Figures 2-4 The utility model provides an embodiment: a replaceable steam turbine blade, including rotating shaft 1, the rotating shaft 1 is connected with blade shaft sleeve 2, and the middle part fixed setting of rotating shaft 1 outside end surface has outer gear portion 101, and the inner wall fixed setting of blade shaft sleeve 2 has inner gear portion 201, and blade shaft sleeve 2 is inserted into the middle part of rotating shaft 1 and makes the meshing connection between outer gear portion 101 and inner gear portion 201, can drive blade shaft sleeve 2 to rotate when rotating shaft 1 rotates, and blade shaft sleeve 2 front end fixed connection has connecting pipe 202, and the middle part front end annular array of rotating shaft 1 outside end surface is provided with a plurality of threaded holes 102, and connecting pipe 202 is inserted into rotating shaft 1 after being passed through a plurality of first bolts 203 and is respectively inserted into a plurality of threaded holes 102 inside screw thread connection fixed, after being fixed between connecting pipe 202 and rotating shaft 1, the position of blade shaft sleeve 2 is fixed, prevents blade shaft sleeve 2 from sliding on rotating shaft 1, simultaneously, a plurality of first bolts 203 are disassembled, connecting pipe 202 is pulled, and blade shaft sleeve 2 can be made to slide on rotating shaft 1 to the front by connecting pipe 202, so that outer gear portion 101 and inner gear portion 201 are separated, and blade shaft sleeve 2 can be disassembled and overhauled.

[0025] Working principle: in use, first through the connecting pipe 202 and the threaded connection of rotating shaft 1 fixed, ensure that the blade shaft sleeve 2 is stably sleeved on the rotating shaft 1, and through the meshing of outer tooth part 101 and inner tooth part 201, realize the synchronous rotation of blade shaft sleeve 2 and rotating shaft 1. Subsequently, the T-shaped insertion part 301 of each steam turbine blade 3 lower end is aligned with the T-shaped clamping groove 204 on the blade shaft sleeve 2 and slides in, until the blade and the clamping plate 205 on both sides contact, then through the second bolt 302, the steam turbine blade 3 and the clamping plate 205 are tightly connected, ensure the stability and reliability of the blade in the rotating process. When the steam turbine blade 3 needs to be overhauled or replaced, only the second bolt 302 is disassembled, then the steam turbine blade 3 is slid forward along the T-shaped clamping groove 204, the steam turbine blade 3 can be easily disassembled; similarly, if the entire blade shaft sleeve 2 needs to be maintained, the first bolt 203 can be loosened, the connecting pipe 202 is pulled forward to make the blade shaft sleeve 2 separate from the outer tooth part 101, the disassembly operation is completed, the whole process is simple and convenient, greatly improves the maintenance efficiency and operability.

[0026] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A replaceable steam turbine blade, comprising a rotating shaft (1), characterized in that: A blade bushing (2) is connected to the rotating shaft (1). A connecting pipe (202) is fixedly connected to the front end of the blade bushing (2). A plurality of T-shaped slots (204) are arranged in an annular array on the outer end face of the blade bushing (2). A clamping plate (205) is fixedly connected to both sides of each T-shaped slot (204) on the outer end face of the blade bushing (2). A plurality of turbine blades (3) are connected in an annular array on the outer end face of the blade bushing (2).

2. The replaceable turbine blade according to claim 1, characterized in that: An external toothed portion (101) is fixedly provided in the middle of the outer end face of the rotating shaft (1), and an internal toothed portion (201) is fixedly provided on the inner wall of the blade bushing (2).

3. A replaceable turbine blade according to claim 2, characterized in that: The blade bushing (2) is fitted into the middle of the rotating shaft (1) and the outer tooth (101) and the inner tooth (201) are meshed together.

4. A replaceable turbine blade according to claim 1, characterized in that: The outer end face of the rotating shaft (1) has a ring array of multiple threaded holes (102) at the front end of the middle part. After the connecting tube (202) is fitted onto the rotating shaft (1), multiple first bolts (203) pass through the connecting tube (202) and are respectively inserted into the multiple threaded holes (102) for threaded connection and fixation.

5. A replaceable turbine blade according to claim 1, characterized in that: The turbine blade (3) is fixedly provided with a T-shaped insertion part (301) at the lower end, and the front and rear ends of the T-shaped slot (204) are respectively connected to the front and rear end faces of the blade bushing (2).

6. A replaceable turbine blade according to claim 5, characterized in that: The lower T-shaped insertion parts (301) of the turbine blades (3) slide into the interior of the T-shaped slots (204) along the front end face of the blade sleeve (2), and the connection between the turbine blades (3) and the T-shaped insertion parts (301) slides between the two clamping plates (205) at the upper end of the T-shaped slots (204).

7. A replaceable turbine blade according to claim 6, characterized in that: The turbine blade (3) is fixedly connected to the T-shaped plug (301) and the two clamps (205) by a plurality of second bolts (302).

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