CN216811787U

CN216811787U - Low-pressure cylinder final-stage blade for heating unit

Info

Publication number: CN216811787U
Application number: CN202122110900.XU
Authority: CN
Inventors: 崔玉岭; 张宪岭; 颜刚; 时标; 梁学东; 张允洲
Original assignee: Huaneng Nanjing Jinling Power Generation Co Ltd
Current assignee: Huaneng Nanjing Jinling Power Generation Co Ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-06-24
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses a low-pressure cylinder final-stage blade for a heating unit, which comprises a rotating shaft rod, wherein a fixed seat is fixedly connected to the rotating shaft rod, a rotating disc is sleeved on the rotating shaft rod, and a cavity is formed in the rotating disc; when the last-stage blade of the low-pressure cylinder is used, the blade is installed in the low-pressure cylinder through the arrangement of the rotating shaft rod, the sliding groove is formed in the fixed seat through the arrangement of the fixed seat, the ball is installed in the sliding groove, the top point of the ball is in sliding connection with the inner wall of the cavity of the rotating disc, the friction force between the rotating disc and the rotating shaft rod is reduced, steam driving the rotating blade to rotate is reduced, when the rotating disc rotates and vibrates, the inner wall of the cavity of the rotating disc extrudes the first baffle and the second baffle through the first spring and the second spring which are connected with the left side wall and the right side wall of the fixed seat, the shock absorption is realized through the compression of the first spring and the second spring, the problems of aerodynamic and strength vibration are avoided, and the length of the last-stage blade is limited, so that the steam exhaust area of the last-stage blade is limited.

Description

Low-pressure cylinder final-stage blade for heating unit

Technical Field

The utility model relates to the technical field of low-pressure cylinder final-stage blades, in particular to a low-pressure cylinder final-stage blade for a heating unit.

Background

The steam turbine is also called as a steam turbine engine, and is a rotary steam power device.A high-temperature high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then is sprayed onto blades, so that a rotor provided with blade rows rotates, and simultaneously, the rotor does work outwards. Steam turbines are the main equipment of modern thermal power plants, and are also used in metallurgical industry, chemical industry and ship power plants, and the last stage blades of the steam turbines are the core components of the steam turbines, particularly for large-capacity steam turbines, which represent the technical level of the steam turbines.

Under some working conditions, the steam turbine needs to meet the operation with variable power and variable rotating speed, in order to meet the application requirements of the steam turbines with different back pressures and unit grades, companies concentrate strength on developing long blades with larger steam discharge area, but due to the problems in the aspects of aerodynamics and strength vibration, the length of the last-stage blade is limited, so that the steam discharge area of the last-stage blade is limited, the steam turbine needs to meet the operation with variable power and variable rotating speed, for a high-power steam turbine, the problem that the production design of the last-stage moving blade is large in scale is solved for realizing the operation with variable power and variable rotating speed, if the last-stage moving blade is too thick and too long, a large amount of steam is needed for driving the moving blade to rotate, the speed of the moving blade is not well controlled, and the speed change is not easy to realize.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a low-pressure cylinder final-stage blade for a heating unit.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a low-pressure cylinder final-stage blade for a heating unit comprises a rotating shaft rod, wherein a fixed seat is fixedly connected to the rotating shaft rod, a rotating disc is sleeved on the rotating shaft rod, and a cavity is formed in the rotating disc;

the fixing base is established in the cavity, the spout has been seted up to the fixing base lateral wall, be provided with the ball in the spout, the first spring of fixing base left side wall fixedly connected with, the first baffle of one end fixedly connected with of fixing base is being kept away from to first spring, fixing base right side wall fixedly connected with second spring, the second spring is keeping away from the one end fixedly connected with second baffle of fixing base, carousel lateral wall fixedly connected with blade.

Preferably, the sliding groove is annular, a plurality of balls are arranged in the sliding groove, and the balls are connected with the sliding groove in a sliding mode.

Preferably, the diameter of the cavity is larger than that of the fixed seat, the outer vertex of the ball is in contact with the inner wall of the cavity of the rotary table, and the ball is connected with the rotary table in a rotating mode.

Preferably, the quantity that first spring set up is six, just the quantity that the second spring set up is six, and six first spring equipartition is connected the fixing base left side wall, six the second spring equipartition is connected the fixing base right side wall.

Preferably, the first baffle and the second baffle are both provided with through holes, the diameter of each through hole is larger than the diameter of the rotating shaft, the outer diameter of the first baffle and the outer diameter of the second baffle are smaller than the diameter of the turntable cavity, and the first baffle and the second baffle are consistent in size.

Preferably, the lateral wall and the carousel cavity left wall contact setting of first baffle, the lateral wall and the carousel cavity right wall contact setting of second baffle, the quantity that the blade set up is a plurality of, just blade equipartition fixed connection be in the carousel lateral wall.

Compared with the prior art, the utility model has the beneficial effects that:

1. when the final-stage blade of the low-pressure cylinder for the heating unit is used, the blade is installed in the low-pressure cylinder through the arrangement of the rotating shaft rod, the fixed seat is provided with the sliding groove through the arrangement of the fixed seat, the ball is installed in the sliding groove, the vertex of the ball is in sliding connection with the inner wall of the cavity of the rotating disc, the friction force between the rotating disc and the rotating shaft rod is reduced, and the steam for driving the rotating blade to rotate is reduced.

2. When the low-pressure cylinder final-stage blade for the heating unit works, when the rotary table rotates and vibrates, the inner wall of the cavity of the rotary table extrudes the first baffle and the second baffle connected with the side walls of the first spring and the second spring through the first spring and the second spring connected with the left side wall and the right side wall of the fixed seat, and the first spring and the second spring are compressed through the first baffle and the second baffle to absorb shock, so that the problems of aerodynamics and intensity vibration are solved, and the length of the final-stage blade is limited, so that the steam exhaust area of the final-stage blade is limited.

Drawings

Fig. 1 is a schematic structural view of a final stage blade of a low-pressure cylinder for a heating unit according to the present invention;

fig. 2 is a schematic cross-sectional structural view of a final stage blade of a low-pressure cylinder for a heating unit according to the present invention;

fig. 3 is a schematic structural diagram of a last-stage blade of a low-pressure cylinder for a heating unit according to the present invention.

In the figure: 1. rotating the shaft lever; 2. a fixed seat; 3. a turntable; 4. a chute; 5. a ball bearing; 6. a first spring; 7. a first baffle plate; 8. a second spring; 9. a second baffle; 10. a blade.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-3, a low-pressure cylinder last-stage blade for a heating and heat-supplying unit comprises a rotating shaft rod 1, wherein a fixed seat 2 is fixedly connected to the rotating shaft rod 1, a rotating disc 3 is sleeved on the rotating shaft rod 1, and a cavity is formed in the rotating disc 3;

fixing base 2 is established in the cavity, and 2 lateral walls of fixing base have seted up spout 4, are provided with ball 5 in the spout 4, and spout 4 sets up to the annular form, and is provided with a plurality of balls 5 in the spout 4, and ball 5 sets up with 4 sliding connection of spout, and the diameter of cavity is greater than the diameter of

fixing base

2, and 5 outer summits of ball and 3 cavity inner wall contact settings of carousel, and ball 5 rotates with carousel 3 to be connected the setting.

When the last stage vane of the low pressure cylinder provided by the utility model is used, the vane 10 is installed in the low pressure cylinder through the installation of the rotating shaft lever 1, the fixed seat 2 is provided with the sliding groove 4, the ball 5 is installed in the sliding groove 4, the vertex of the ball 5 is connected with the inner wall of the cavity of the rotating disc 3 in a sliding way, the friction force between the rotating disc 3 and the rotating shaft lever 1 is reduced, and the steam for driving the moving vane to rotate is reduced.

The left side wall of the fixed seat 2 is fixedly connected with a first spring 6, one end of the first spring 6, far away from the fixed seat 2, is fixedly connected with a first baffle 7, the right side wall of the fixed seat 2 is fixedly connected with a second spring 8, the number of the first springs 6 is six, the number of the second springs 8 is six, the six first springs 6 are uniformly distributed on the left side wall of the fixed seat 2, and the six second springs 8 are uniformly distributed on the right side wall of the fixed seat 2.

Second spring 8 is keeping away from one end fixedly connected with second baffle 9 of

fixing base

2, 3 lateral wall fixedly connected with blades of carousel 10, the through-hole has all been seted up with second baffle 9 to first baffle 7, and the through-hole diameter is greater than the diameter of runner spindle pole 1, the external diameter of first baffle 7 and second baffle 9 is less than 3 cavity diameters of carousel, and the size that first baffle 7 and second baffle 9 set up is unanimous, the lateral wall of

first baffle

7 and 3 cavity left wall contacts the setting of carousel, the lateral wall of

second baffle

9 and 3 cavity right wall contacts the setting of carousel, the quantity that blades 10 set up is a plurality of, and 10 equipartition fixed connection of blades is at 3 lateral walls of carousel.

It should be noted that, when the rotary table 3 rotates and vibrates during operation, the first spring 6 and the second spring 8 connected with the left side wall and the right side wall of the fixed seat 2 enable the inner wall of the cavity of the rotary table 3 to extrude the first baffle 7 and the second baffle 9 connected with the side walls of the first spring 6 and the second spring 8, and the first baffle 7 and the second baffle 9 compress the first spring 6 and the second spring 8 for damping, so that the problems of aerodynamics and intensity vibration are avoided, and the length of the last-stage blade is limited so as to limit the steam exhaust area of the last-stage blade.

The functional principle of the present invention can be illustrated by the following operation modes;

when the final-stage vane of the low-pressure cylinder for the heating unit is used, the vane 10 is installed in the low-pressure cylinder through the rotating shaft rod 1, the sliding groove 4 is formed in the fixed seat 2 through the fixed seat 2 installed on the rotating shaft rod 1, the ball 5 is installed in the sliding groove 4, the top point of the ball 5 is in sliding connection with the inner wall of the cavity of the rotary disc 3, the friction force between the rotary disc 3 and the rotating shaft rod 1 is reduced, and the steam driving the rotating blade to rotate is reduced.

When the last-stage blade of the low-pressure cylinder works, when the rotary table 3 rotates and vibrates, the first spring 6 and the second spring 8 which are connected with the left side wall and the right side wall of the fixed seat 2 enable the inner wall of the cavity of the rotary table 3 to extrude the first baffle 7 and the second baffle 9 which are connected with the side walls of the first spring 6 and the second spring 8, the first spring 6 and the second spring 8 are compressed through the first baffle 7 and the second baffle 9 for damping, the problems of aerodynamics and intensity vibration are avoided, and the length of the blade 10 is limited so as to limit the steam exhaust area of the last-stage blade.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the utility model concepts of the present invention in the scope of the present invention.

Claims

1. The low-pressure cylinder last-stage blade for the heating unit comprises a rotating shaft rod (1), and is characterized in that a fixed seat (2) is fixedly connected to the rotating shaft rod (1), a rotating disc (3) is sleeved on the rotating shaft rod (1), and a cavity is formed in the rotating disc (3);

establish fixing base (2) in the cavity, spout (4) have been seted up to fixing base (2) lateral wall, be provided with ball (5) in spout (4), the first spring of fixing base (2) left side wall fixedly connected with (6), the first baffle of one end fixedly connected with (7) of fixing base (2) is being kept away from in first spring (6), fixing base (2) right side wall fixedly connected with second spring (8), one end fixedly connected with second baffle (9) of fixing base (2) is being kept away from in second spring (8), carousel (3) lateral wall fixedly connected with blade (10).

2. The last stage blade of the low pressure cylinder for the heating and heat supply unit according to claim 1, wherein the sliding groove (4) is configured in a ring shape, and a plurality of balls (5) are disposed in the sliding groove (4), and the balls (5) are slidably connected with the sliding groove (4).

3. The last stage blade of the low pressure cylinder for heating unit of claim 1, characterized in that the diameter of the cavity is larger than the diameter of the fixed base (2), and the outer vertex of the ball (5) is in contact with the inner wall of the cavity of the rotating disc (3), and the ball (5) is rotatably connected with the rotating disc (3).

4. The last-stage blade of the low-pressure cylinder for the heating unit according to claim 1, wherein the number of the first springs (6) is six, the number of the second springs (8) is six, the six first springs (6) are uniformly connected to the left side wall of the fixing seat (2), and the six second springs (8) are uniformly connected to the right side wall of the fixing seat (2).

5. The last-stage blade of the low-pressure cylinder for the heating unit according to claim 1, wherein the first baffle plate (7) and the second baffle plate (9) are both provided with through holes, the diameter of each through hole is larger than that of the rotating shaft rod (1), the outer diameters of the first baffle plate (7) and the second baffle plate (9) are smaller than the diameter of the cavity of the rotating disc (3), and the first baffle plate (7) and the second baffle plate (9) are arranged in the same size.

6. The last-stage vane of the low-pressure cylinder for the heating unit set according to claim 1, wherein the outer side wall of the first baffle (7) is in contact with the left wall of the cavity of the rotary table (3), the outer side wall of the second baffle (9) is in contact with the right wall of the cavity of the rotary table (3), the number of the vanes (10) is multiple, and the vanes (10) are uniformly and fixedly connected to the outer side wall of the rotary table (3).