LU504604B1

LU504604B1 - The safety trip system for steam turbine

Info

Publication number: LU504604B1
Application number: LU504604A
Authority: LU
Inventors: Wentao Zheng; Xinyu Wang; Xiaohui Zhang; Long He; Yanping Zhang; Junzhong Li
Original assignee: Inner Mongolia Helin Power Generation Co Ltd
Priority date: 2023-05-04
Filing date: 2023-06-28
Publication date: 2024-01-09
Also published as: CN116428027A

Abstract

The invention discloses a safety shut-off system for a steam turbine, which includes a transition pipe, and a protective component for providing protection is arranged outside the transition pipe; a guide assembly arranged on the bottom inner wall of the transition pipe; one end of the movable rod is fixedly connected with a first sealing block; a telescopic assembly is arranged at one side of the movable rod away from the first sealing block; and a push seat fixedly connected with the movable rod is arranged below the extrusion block. The invention can buffer the "water hammer", reduce the harm caused by the "water hammer" when the pipeline is closed, which is beneficial to the safety of the pipeline.

Description

The safety trip system for steam turbine

TECHNICAL FIELD

The invention belongs to the technical field of steam turbines, and particularly relates to a safety trip system of a steam turbine.

BACKGROUND

Steam turbine is a rotary power machine which converts the energy of steam into mechanical work. It can be used as a prime mover for power generation, and can also directly drive various pumps, fans, compressors and so on. In the production process of using steam turbine, it is necessary to use the steam turbine safety trip system to protect, maintain and repair the system where the steam turbine is located, and avoid the shutdown loss caused by unit tripping.

An existing safety trip system is directly connected with a fire-resistant oil system through a high-pressure fire-resistant oil pressure oil path, the fire-resistant oil system plays a role in supplying oil, once the high-pressure trip system has the defects of blocking, damage and burning of a solenoid valve, blockage of a throttling hole and the like, high-pressure pressure oil cannot be effectively cut off, When the oil in the pipeline is suddenly closed, the water hammer effect will appear, and the water hammer effect is easy to bring hidden dangers to the safety of the pipeline, so we put forward a steam turbine safety trip system.

SUMMARY

The invention aims to provide a steam turbine safety trip system so as to solve the technical problems of low safety factor and weak running process of the existing steam turbine safety trip system.

In order to solve the above technical problems, the specific technical scheme of the present invention is as follows:

In some embodiments of the present application, a steam turbine safety trip system is provided, which includes a transition pipe, wherein a protection component for providing protection is arranged outside the transition pipe, a transverse plate is arranged on the protection component, a screw penetrating through the transition pipe is sleeved on the internal thread of the transverse plate, and an extrusion block is rotationally arranged at the bottom end of the screw;

The guide assembly is arranged on the inner wall of the bottom of the transition pipe and is provided with a movable rod, one end of the movable rod is fixedly connected with a first sealing block, one side of the movable rod far away from the first sealing block is provided witk/504604 an expansion assembly, one end of the expansion assembly is provided with a second sealing block, and one side of the second sealing block is equipped with a flow guide cover; and a pushing seat fixedly connected with that movable rod is arranged below the extrusion block.

Preferably, the left side of the transition pipe is provided with a liquid inlet pipe, and the right side of the transition pipe is provided with a liquid outlet pipe.

Preferably, the protection assembly includes two fixed frames fixedly sleeved outside the transition pipe, a plurality of reinforcing rods are arranged between the two fixed frames in an array manner, and the transverse plate is fixedly connected with the fixed frames.

Preferably, the guide assembly includes a fixed block fixedly connected to the inner wall of the bottom of the transition pipe, a rectangular guide hole is formed in the fixed block, a guide rod is movably sleeved in the rectangular guide hole, and the guide rod is fixedly connected with the movable rod.

Preferably, the telescopic assembly includes a sleeve fixedly connected to the second sealing block, a spring is sleeved inside the sleeve, and an elastic band is connected between the second sealing block and the guide rod.

Preferably, the sides of the squeezing block and the pushing seat, which are close to each other, are both provided with an inclined plane, and the outer parts of the first sealing block and the second sealing block are both provided with rubber sleeves.

Preferably, the transverse plate is provided with a threaded hole, and the screw rod is matched with the threaded hole; the transition pipe is provided with a movable hole, and a sealing ring is sleeved inside the movable hole; and one side of the screw rod below the transverse plate is equipped with a smooth round rod, and the smooth round rod penetrates through the sealing ring.

Compared with the prior art, the invention has the beneficial effects that during normal oil delivery, oil enters from the liquid inlet pipe, pushes away the second sealing block, enters the transition pipe, and then enters the liquid outlet pipe to be discharged; when the oil is required to be closed, the first sealing block and the second sealing block are used for plugging two ends of the transition pipe, and water hammer generated by backflow can extrude the flow guide cover,

Therefore, the second sealing block is conveniently blocked leftwards, the ‘water hammer 'in the liquid inlet pipe extrudes the second sealing block, and the spring buffers at the moment, so that the acting force of the secondary 'water hammer' is reduced; and the scheme is simple in structure and novel in design, and can buffer the "water hammers’, so that the harm caused by the

'water hammers' when the pipeline is closed is reduced, and the safety of the pipeline k§/504604 facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference characters refer to like parts throughout the drawings.

In the drawings: brief description of the drawings FIG. 1 is a front view of a steam turbine safety trip system according to the present invention.

FIG. 2 is a sectional structure diagram of a steam turbine safety trip system according to the present invention.

FIG. 3 is an overall three-dimensional structural diagram of a steam turbine safety trip system according to the present invention.

FIG. 4 is a three-dimensional structure diagram of the movable rod and the first sealing block of the steam turbine safety trip system according to the present invention.

FIG. 5 is a three-dimensional structure diagram of the second sealing block and the shroud of the steam turbine safety trip system according to the present invention.

In the figure: 1 liquid inlet pipe, 2 liquid outlet pipe, 3 transition pipe, 4 fixed frame, 5 reinforcing rod, 6 cross plate, 7 screw, 8 extrusion block, 9 fixed block, 10 guide rod, 11 moving rod, 12 first sealing head, 13 pushing seat, 14 sleeve, 15 second sealing head, 16 spring, 17 air deflector and 18 elastic band.

DETAILED DESCRIPTION

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", and "rear", left "and" right ", vertical" and "horizontal", top and bottom, inner and outer are based on the orientation or positional relationship shown in the drawings, which are only for convenience of description of the present application and simplification of description. It is not intended to indicate or imply that the devices or elements referred to must have a particular orientation, b&/504604 constructed and operate in a particular orientation, and therefore should not be construed as limiting the application.

The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying the number of technical features indicated. Thus, the features defined as "first" or "second" may be explicitly or implicitly defined as including one or more of the features. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting" and "connecting" should be interpreted in a broad sense, for example, they can be fixed connection, detachable connection or integral connection; they can be mechanical connection or electrical connection; It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meaning of the above terms in the present application in a specific context.

For a better understanding of the objects, structure, and function of the present invention, the following detailed description will be made with reference to the accompanying drawings.

Referring to figs. 1-5, in some embodiments according to the present application, a steam turbine safety trip system 1. Includes a transition pipe 3, wherein the outside of the transition pipe 3 is provided with a protection component used for providing protection; the protection component is provided with a transverse plate 6; the guide assembly is arranged on the inner wall of the bottom of the transition pipe 3, the guide assembly is provided with a movable rod 11, one end of the movable rod 11 is fixedly connected with a first sealing block 12, one side of the movable rod 11 far away from the first sealing block 12 is provided with an expansion assembly, one end of the expansion assembly is provided with a second sealing block 15, One side of the second sealing block 15 is provided with a deflector 17, and the extrusion block 8 extends into the deflector 17, and a pushing seat 13 fixedly connected with the movable rod 11 is arranged below the extrusion block 8.

The technical scheme has the advantages that: a protection component for providing protection is arranged outside the transition pipe 3, a transverse plate 6 is arranged on the protection component, a screw rod 7 penetrating through the transition pipe 3 is sleeved on the inner thread of the transverse plate 6, an extrusion block 8 is rotationally arranged at the bottom end of the screw rod 7, and the screw rod 7 can drive the extrusion block 8 to move downwards to extrude a pushing seat 13; LUS04604 a guide assembly arranged on the inner wall of the bottom of the transition tube 3, a movable rod 11 is arranged on the guide assembly, one end of the movable rod 11 is fixedly connected with a first sealing block 12, a telescopic assembly is arranged at one side of the 5 movable rod 11, a second sealing block 15 is arranged at one end of the telescopic assembly, a flow guide hood 17 is arranged on one side of the second sealing block 15, and the extrusion block 8 extends into the flow guide hood 17, a push seat 13 fixedly connected with the movable rod 11, is arranged below the extrusion block 8, the guide assembly is convenient for guiding the first sealing block 12 and the second sealing block 15, the telescopic assembly can buffer the second sealing block 15, thus reducing the "water hammer" force.

In order to further optimize the above technical solution, as shown in FIG. 1, the left side of the transition pipe 3 is provided with a liquid inlet pipe 1, and the right side of the transition pipe 3 is provided with a liquid outlet pipe 2.

The technical scheme has the advantages that: a liquid inlet pipe 1 is arranged on the left side of the transition pipe 3, a liquid outlet pipe 2 is arranged on the right side of the transition pipe 3, and the oil enters the transition tube 3 from the liquid inlet pipe 1 and then enters the liquid outlet pipe 2 from the transition tube 3 to flow away.

In order to further optimize the above technical solution, as shown in FIG. 3, the protection assembly includes two fixed frames 4 fixedly sleeved outside the transition pipe 3, a plurality of reinforcing rods 5 are arranged in an array between the two fixed frames 4, and the transverse plate 6 is fixedly connected with the fixed frames 4.

The technical scheme has the advantages that: the protection assembly includes two fixed frames 4 fixedly sleeved outside the transition pipe 3, a plurality of reinforcing rods 5 are arranged between the two fixed frames 4 in an array manner, the transverse plate 6 is fixedly connected with the fixed frames 4, and the fixed frames 4 and the reinforcing rods 5 provide protection for the outside of the transition pipe 3.

In order to further optimize the above technical solution, as shown in FIG. 2, the guide assembly includes a fixed block 9 fixedly connected to the inner wall of the bottom of the transition pipe 3, a rectangular guide hole is formed in the fixed block 9, a guide rod 10 is movably sleeved in the rectangular guide hole, and the guide rod 10 is fixedly connected with a movable rod 11.

The technical scheme has the advantages that:

the guide assembly includes a fixed block 9 fixedly connected to the inner wall of tHh&504604 bottom of the transition pipe 3, a rectangular guide hole is arranged in the fixed block 9, a guide rod 10 is movably sleeved in the rectangular guide hole, the guide rod 10 is fixedly connected with a movable rod 11, and the guide rod 10 moves in the rectangular guide hole, so that the movable rod 11 can be guided. Thereby guiding the first sealing block 12 and the second sealing block 15.

In order to further optimize the above technical solution, as shown in FIG. 2, the telescopic assembly includes a sleeve 14 fixedly connected to a second sealing block 15, a spring 16 is sleeved inside the sleeve 14, and an elastic band 18 is connected between the second sealing block 15 and the guide rod 10.

The technical scheme has the advantages that:

During normal infusion, the elastic band 18 tightens the first sealing block 12, and the telescopic assembly tightens the second sealing block 15, so that the liquid inlet pipe 1, the transition pipe 3 and the liquid outlet pipe 2 are communicated.

In order to further optimize the above technical solution, as shown in FIG. 2, the side of the extrusion block 8 and the pushing seat 13 close to each other is provided with an inclined plane, and the first sealing block 12 and the second sealing block 15 are provided with rubber sleeves outside.

The beneficial effects of the above technical scheme are as follows: the sides of the extrusion block 8 and the pushing seat 13, which are close to each other, are both provided with inclined planes, and the outer parts of the first sealing block 12 and the second sealing block 15 are both provided with rubber sleeves, which are beneficial to sealing performance.

In order to further optimize the above technical solution, as shown in FIG. 2, the transverse plate 6 is provided with a threaded hole, and the screw 7 is matched with the threaded hole; the transition pipe 3 is provided with a movable hole, and a sealing ring is sleeved inside the movable hole; one side of the screw 7 below the transverse plate 6 is provided with an smooth round rod, and the smooth round rod penetrates through the sealing ring.

The beneficial effects of the technical scheme are as follows: the transverse plate 6 is provided with a threaded hole, and the screw 7 is matched with the threaded hole; the transition pipe 3 is provided with a movable hole, and a sealing ring is sleeved inside the movable hole; and one side of the screw 7, which is positioned below the transverse plate 6, is provided with the smooth round rod, and the smooth round rod penetrates through the sealing ring.

The overall working principle of the invention is as follows:

during normal infusion, the elastic band 18 tightens the first sealing block 12, and tH&/504604 telescopic assembly tightens the second sealing block 15, so that the liquid inlet pipe 1, the transition pipe 3 and the liquid outlet pipe 2 are communicated; when closing is required, the screw rod 7 is manually rotated to move down, and the screw rod 7 drives the extrusion block 8 to move down to extrude the pushing seat 13; The pushing seat 13 drives the movable rod 11 and the first sealing block 12 to move rightward to seal the liquid outlet pipe 2, the second sealing block 15 is driven to move rightward through the spring 16 when the movable rod 11 moves rightward, and the backflow of water hammer generated when the first sealing block 12 is closed can extrude the inside of the flow guide cover 17, so that the second sealing block 15 is pushed to move leftward. O as to buffer the primary water hammer, and the water hammer in the liquid inlet pipe 1 presses the second sealing block 15 to push the second sealing block 15 to move rightward to compress the spring 16, so that the spring 16 is used for buffering the secondary water hammer again, thereby effectively relieving the acting force caused by the water hammer and being beneficial to the safety of the pipeline.

In order to further optimize the technical scheme, the invention also includes a data acquisition module, a data processing module and a control module, wherein the data acquisition module is used for acquiring parameter data in the operation process of the steam turbine; And that control module is connected with the data processing module and the steam turbine, and is use for adjusting the rotating speed of the steam turbine and the bearing oil pressure of the steam turbine accord to the working state instruction.

The data processing module is used for setting a steam turbine rotating speed preset value

AO, and the data processing module is also used for setting a first preset steam turbine rotating speed difference value al, a second preset steam turbine rotation speed difference value a2, a third preset steam turbine rotation speed difference value a3, and a fourth preset steam turbines rotation speed different value a4, wherein al < a2 < a3 < a4; The data processing module is further configured to set a first preset working condition matrix G1 (gl, hl), a second preset working condition matrix G2 (g2, h2), a third preset working condition array G3 (g3, h3) and a fourth preset working condition array G4 (g4, h4), wherein gl to g4 are first to fourth preset rotating speeds in sequence; and gl < g2 < g3 < g4, hl to h4 are that oil pressure of the first to fourth preset bearings in turn, and h1 <h2 <h3 < h4;

A preset working condition matrix G is selected as the working condition of the steam turbine according to the difference value between the acquired steam turbine rotating speed value

AA and the preset value AO of the set steam turbine rotating speed value;

When AA-AO0 = Al, the first preset working condition matrix A1 is selected as the working condition of the steam turbine; LU504604

When al is less than or equal to /\A-AO and less than or equal to A2, selecting the second preset working condition matrix A2 as the working condition of the steam turbine;

When a2 is less than or equal to /\A-AO and less than or equal to a3, selecting the third preset working condition matrix A3 as the working condition of the steam turbine;

When a3 is less than or equal to /\A-AO and less than or equal to a4, the fourth preset working condition matrix A4 is selected as the working condition of the steam turbine;

When the ith preset working condition matrix Gi is selected as the working condition of the steam turbine, the control module controls the steam turbine to work at the ith preset rotating speed gi, and further controls the bearing oil pressure of the steam turbine to work at the ith preset bearing oil pressure hi (I = 1, 2, 3, 4).

Finally, it should be noted that the above embodiments are only used to illustrate the technical scheme of the present invention, not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the technical scheme of the present invention. These modifications or equivalent substitutions shall not cause the modified technical solution to depart from the spirit and scope of the technical solution of the present invention.

Claims

CLAIMS LU504604

1. À safety trip system of a steam turbine is characterized by comprise a transition pipe (3), wherein a protection component for providing protection 1s arranged outside that transition pipe (3), a transverse plate (6) is arranged on the protection component, a screw rod (7) penetrate through the transition pipe is sleeved on the inner thread of the transverse plate (6), and an extrusion block (8) is rotationally arranged at the bottom end of the screw rod (7); the guide assembly is arranged on the inner wall of the bottom of the transition pipe (3), a movable rod (11) is arranged on the guide assembly, one end of the movable rod (11) is fixedly connected with a first sealing block (12), and a telescopic assembly is arranged at one side of the movable rod away from the first sealing block (12); one end of the telescopic assembly is provided with a second sealing block (15), one side of the second sealing block (15) is provided with a flow guide cover (17), the extrusion block (8) extends into the flow guide cover (17), and a pushing seat (13) fixedly connected with the movable rod (11) is arranged below the extrusion block (8).

2. The steam turbine safety trip system according to claim 1, wherein a liquid inlet pipe (1) is arranged on the left side of the transition pipe (3), and a liquid outlet pipe (2) is arranged on the right side of the transition pipe (3).

3. The steam turbine safety trip system according to claim 1, wherein the protection assembly comprises two fixing frames (4) fixedly sleeved outside the transition pipe (3), a plurality of reinforcing rods (5) are arranged in an array between the two fixing frames (4), and the transverse plate (6) is fixedly connected with the fixing frames (5).

4. The steam turbine safety trip system according to claim 1, wherein the guide assembly comprises a fixed block (9) fixedly connected to the inner wall of the bottom of the transition pipe (3), a rectangular guide hole is formed in the fixed block (9), and a guide rod (10) is movably sleeved in the rectangular guide hole, and that guide rod (10) is fixedly connected with the movable rod (11).

5. The steam turbine safety trip system according to claim 4, wherein the telescopic assembly comprises a sleeve (14) fixedly connected to the second sealing block (15), a spring (16) is sleeved inside the sleeve (14), and an elastic band (18) is connected between the second sealing block (15) and the guide rod (10).

6. The steam turbine safety trip system according to claim 1, wherein an inclined plane is provided on each side of the squeezing block (8) and the pushing seat (13) close to each other, and a rubber sleeve is provided outside each of the first sealing block (12) and the second sealing block (15).

7. The steam turbine safety trip system according to claim 1, wherein the transverse plate (6) k$/504604 provided with a threaded hole, the screw rod (7) is matched with the threaded hole, the transition pipe (3) is provided with a movable hole, a sealing ring is sleeved inside the movable hole, and a smooth round rod is arranged on one side of the screw rod (7) below the transverse plate (6), and that smooth round rod penetrate through the sealing ring.