CN108072738B - A steam turbine final stage humidity detection device and steam turbine - Google Patents

Abstract

The invention discloses a final humidity detection device of a steam turbine and the steam turbine, the final humidity detection device of the steam turbine comprises: the device comprises a probe, a sleeve, a shutter, a communicating pipe and a control device; one end of the communicating pipe is communicated with the sleeve, and the other end of the communicating pipe is provided with a cover plate which is exposed outside the cylinder. When the device is used, firstly, the frequency value at the moment is measured in the state that the shutter is closed; and then the shutter is opened by the control device, so that steam enters from the front end of the sleeve and passes through the probe, the frequency value in the state is measured, and finally the real-time final stage humidity of the steam turbine is calculated by the value measured twice. The process does not need the movement of the probe, namely, the participation of the guide rail is avoided, so that the phenomenon of rail jamming is avoided, and the phenomenon of loosening of the probe is prevented. Therefore, the final humidity detection device of the steam turbine can prevent the loosening of the probe while avoiding the clamping of the rail, and solves the difficult problem in the prior art.

Description

A steam turbine final stage humidity detection device and steam turbine

Technical field

The present invention relates to the field of detection, and more specifically, to a steam turbine final stage humidity detection device and a steam turbine.

Background technique

In the field of steam turbine operation, the operating parameters at each stage are directly related to the economic performance and safety performance of the system. For the humidity of the final stage of the steam turbine, its conditions in each state cannot be directly obtained through other parameters, and relevant equipment needs to be used for detection.

As far as the existing technology is concerned, there are two commonly used methods for measuring the humidity of the final stage of a steam turbine, one is outside the cylinder and the other is inside the cylinder. For out-of-cylinder detection, the steam collected at the final stage passes through a probe with a sleeve to measure relevant data; the disadvantage of this method is that in order to achieve the thermal equilibrium state of the steam during detection, a large amount of steam needs to pass through the probe, which is a time-consuming process It is laborious and not conducive to real-time monitoring. In-cylinder detection, that is, the probe and sleeve are installed in the cavity of the steam turbine, and the handle that controls the movement of the probe is installed outside the cavity; when measuring: first measure the frequency value when the probe is in the sleeve; then manually pull the probe to the sleeve Externally, the frequency value in this state can be measured; finally, through these two parameters, the humidity of the final stage of the steam turbine under this working condition can be calculated. Although it can meet the needs of real-time monitoring, this method still has certain flaws: first, the movement of the probe is required during the detection process, and the phenomenon of loosening of the probe may easily occur; secondly, this measurement method needs to set up a track for the movement of the probe, and the track is in the long-term It is easy to get stuck during use, which may affect the final test results.

Therefore, how to prevent the probe from loosening while avoiding track jamming is an urgent problem that needs to be solved in this field at this stage.

Contents of the invention

In view of this, the purpose of the present invention is to provide a steam turbine final stage humidity detection device, which can prevent the probe from loosening while avoiding track jamming, and solves the problems in the prior art. The present invention also aims to provide a steam turbine, which includes the above-mentioned steam turbine final stage humidity detection device. Therefore, it is possible to avoid track jamming and prevent the probe from loosening.

A steam turbine final stage humidity detection device, including: a probe, a sleeve set outside the probe, a shutter provided at the front end of the sleeve, a connecting pipe used to fix the sleeve and the cylinder wall, A control device for controlling the opening of the blinds is provided in the communication tube; the rear end of the sleeve is in an open state; one end of the communication tube is connected to the sleeve, and the other end is provided with a cover plate, and Exposed outside the cylinder.

Preferably, in the steam turbine final stage humidity detection device, the shutter is provided with a driving member for controlling its opening, one end of the control device is connected to the driving member, and the other end is arranged in the communication pipe and is sleeved with A sealing plug matching the communication pipe.

Preferably, in the steam turbine final stage humidity detection device, the control device is a crank connecting rod mechanism, including: an operating section provided in the connecting pipe, a curved section provided in the sleeve; One end is fixed to the operating section, the other end is connected to the driving member, and the bend of the curved section is hingedly connected to the inner wall of the cylinder.

Preferably, in the steam turbine final stage humidity detection device, the curved section is provided with an action groove at one end connected to the driving part, and the driving part is provided with a through hole, which is inserted between the action groove and the driving part. The fastener in the through hole connects the bending section and the driving member, and the fastener can move freely in the action groove; by controlling the operating section, the driving member moves upward Move and open said blinds.

Preferably, in the steam turbine final stage humidity detection device, the shutter is provided with a magnetic driving member for controlling its opening; the electromagnetic relay is arranged above the driving member and drives the driving member through magnetism. Pieces move.

Preferably, in the steam turbine final stage humidity detection device, the operating section is equipped with a cowhide bowl that matches the communication pipe.

Preferably, in the steam turbine final stage humidity detection device, the communication pipe is provided with a limiting ring for limiting the displacement of the operating section.

Preferably, in the steam turbine final stage humidity detection device, the communication pipe is provided with a guide clip for guiding the movement of the operating section.

Preferably, in the steam turbine final stage humidity detection device, the cover plate and the communication pipe are threadedly connected.

A steam turbine equipped with a steam turbine final stage humidity detection device as described in any of the above items.

The steam turbine final stage humidity detection device provided by the invention includes: a probe, a sleeve set outside the probe, a shutter provided at the front end of the sleeve, and a connecting pipe used to fix the sleeve and the cylinder wall. , a control device provided in the communication tube for controlling the opening of the shutters; the rear end of the sleeve is in an open state; one end of the communication tube is connected to the sleeve, and the other end is provided with a cover plate , and exposed outside the cylinder. When this device is used, first measure the frequency value at this time with the shutters closed; then open the shutters through the control device, allowing steam to enter from the front end of the sleeve and pass through the probe, and measure the frequency value in this state. Finally, the real-time turbine final stage humidity is calculated from the two measured values. This process does not require the movement of the probe, that is, there is no involvement of the guide rail, so the phenomenon of track jamming is avoided and the probe is prevented from loosening. Therefore, the steam turbine final stage humidity detection device disclosed in the present invention can prevent the probe from loosening while avoiding track jamming, and solves the problems in the prior art.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of a steam turbine final stage humidity detection device in a specific embodiment of the present invention;

Figure 2 is a schematic diagram of the control device in the final stage humidity detection device of the steam turbine in the specific embodiment of the present invention.

Figure 1-Figure 2:

Probe - 1, sleeve - 2, shutter - 3, cylinder wall - 4, communication pipe - 5, control device - 6, cover plate - 7, driving part - 8, sealing plug - 9, operating section - 10, bending section —11, action slot —12, electromagnetic relay —13, cowhide bowl —14, limit ring —15, guide clip —16, handle —17.

Detailed ways

The core of this specific embodiment is to provide a steam turbine final stage humidity detection device, which can prevent the probe from loosening while avoiding track jamming, and solves the problems in the existing technology.

Hereinafter, embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not limit the invention described in the claims in any way. In addition, all the contents of the structures shown in the following examples are not limited to what is necessary as a solution to the invention described in the claims.

The steam turbine final stage humidity detection device provided in this specific embodiment includes: a probe 1, a sleeve 2, a louver 3, a connecting pipe 5, and a control device 6. The sleeve 2 is set on the outside of the probe 1, the front end of the sleeve 2 is provided with a shutter 3, and the rear end of the sleeve 2 is open; the connecting pipe 5 is used to fix the sleeve 2 and the cylinder wall 4, and the connecting pipe 5 is provided with a control device 6 for controlling the opening of the shutter 3. One end of the communication pipe 5 is connected with the sleeve 2, and the other end is provided with a cover plate 7 and is exposed outside the cylinder. When this device is used, first measure the frequency value at this time with the shutter 3 closed; then open the shutter 3 through the control device 6, so that steam enters from the front end of the sleeve 2 and passes through the probe 1, and the state is measured The frequency value below is finally used to calculate the real-time turbine final stage humidity through the two measured values. This process does not require the movement of the probe 1, that is, there is no involvement of the guide rail, so the phenomenon of track jamming is avoided and the probe 1 is prevented from loosening. Therefore, the steam turbine final stage humidity detection device disclosed in the present invention can prevent the probe 1 from loosening while avoiding track jamming, and solves the problems in the prior art. Please see Figure 1 and Figure 2 for details.

In the steam turbine final stage humidity detection device provided by this specific embodiment, the shutter 3 is provided with a driving member 8 for controlling its opening, and one end of the control device 6 is connected to the driving member 8, and the other end is arranged in the communication pipe 5, and A sealing plug 9 matching the communication pipe 5 is installed. Please see Figure 1 and Figure 2 for details.

In the steam turbine final stage humidity detection device provided by this specific embodiment, the control device 6 that drives the shutter 3 to open is a crank linkage mechanism, which may include: an operating section 10 and a bending section 11; wherein the operating section 10 is arranged in the communication pipe 5, and the bending section 10 is arranged in the connecting pipe 5. The section 11 is arranged in the cavity surrounded by the sleeve 2, and one end of the curved section 11 is fixed to the operating section 10, and the other end is connected to the driving member 8. The bend of the curved section 11 is hinged with the inner wall of the cylinder.

In the steam turbine final stage humidity detection device provided by this specific embodiment, the specific connection method between the curved section 11 and the driving member 8 can be: an action groove 12 is provided at one end of the curved section 11 connected to the driving member 8, and the driving member 8 is provided with an action groove 12. There is a through hole, and the fastener passes through the action groove 12 and the through hole to connect the two, and the fastener can move freely in the action groove 12. In actual use, the operating section 10 is manually controlled so that the curved section 11 drives the driving member 8 to move upward to achieve the effect of opening the shutters 3; for convenience of operation, the end of the operating section 10 can also be provided with a handle 17. Please see Figure 1 for details.

In the steam turbine final stage humidity detection device provided by this specific embodiment, the shutter 3 can also be opened through the electromagnetic relay 13, that is, the shutter 3 is provided with a magnetic driving member 8 for controlling its opening, and the electromagnetic relay 13 is provided on the The upper part of the driving member 8 is driven upward by magnetism to achieve the effect of opening the blinds 3; when the electromagnetic relay 13 is closed, the magnetism disappears and the driving member 8 returns to its original position due to gravity.

In order to further improve the vacuum state in the cylinder of the steam turbine final stage humidity detection device provided by this specific embodiment, a cowhide bowl 14 matching the communication pipe 5 can be installed on the operating section 10; in order to control the movement displacement of the operating section 10, a cowhide bowl 14 can be installed on the operating section 10 A limiting ring 15 is provided on the communicating tube 5 for restricting its movement; in order to guide the movement trajectory of the operating section 10 , a guide clip 16 for guiding can be provided on the communicating tube 5 . Please see Figure 1 for details.

In order to further increase the convenience of operation and ensure the sealing state of the cylinder, the connection between the cover plate 7 and the communication pipe 5 can be set as a threaded connection in the steam turbine final stage humidity detection device provided by this embodiment.

It should be noted that a steam turbine equipped with the steam turbine final stage humidity detection device disclosed in the present invention is also within the scope of rights protection of the present invention.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A final humidity detection device for a steam turbine, comprising: the probe comprises a probe (1), a sleeve (2) sleeved outside the probe (1), a shutter (3) arranged at the front end of the sleeve (2), a communicating pipe (5) used for fixing the sleeve (2) and a cylinder wall (4), and a control device (6) arranged in the communicating pipe (5) and used for controlling the shutter (3) to be opened; the rear end of the sleeve (2) is in an opening state; one end of the communicating pipe (5) is communicated with the sleeve (2), and the other end of the communicating pipe is provided with a cover plate (7) which is exposed outside the cylinder.

2. The final humidity detection device of a steam turbine according to claim 1, wherein a driving piece (8) for controlling the opening of the shutter (3) is arranged on the shutter (3), one end of the control device (6) is connected with the driving piece (8), and the other end of the control device is arranged in the communicating pipe (5) and sleeved with a sealing plug (9) matched with the communicating pipe (5).

3. The last stage humidity detection device of a steam turbine according to claim 2, wherein the control device (6) is a crank-link mechanism comprising: an operation section (10) provided in the communication pipe (5), and a bending section (11) provided in the sleeve (2); one end of the bending section (11) is fixed with the operation section (10), the other end of the bending section is connected with the driving piece (8), and the bending part of the bending section (11) is hinged with the inner wall of the cylinder.

4. A final stage humidity detection apparatus according to claim 3, characterized in that the bending section (11) is provided with an action groove (12) at one end connected with the driving member (8), the driving member (8) is provided with a through hole, the bending section (11) is connected with the driving member (8) by means of a fastener inserted into the action groove (12) and the through hole, and the fastener is freely movable in the action groove (12); the shutter (3) is opened by controlling the operating section (10) to move the driving member (8) upward.

5. The last stage humidity detection device of a steam turbine according to claim 1, wherein the shutter (3) is provided with a magnetic driving member (8) for controlling the opening thereof; the electromagnetic relay (13) is arranged above the driving piece (8) and drives the driving piece (8) to move through magnetism.

6. A final stage humidity detection apparatus according to claim 3, characterized in that the operating section (10) is fitted with a cowhide bowl (14) matching the communication pipe (5).

7. A final humidity detection apparatus of a steam turbine according to claim 3, wherein the communicating pipe (5) is provided with a stopper ring (15) for restricting displacement of the operation section (10).

8. A final stage humidity detection apparatus of a steam turbine according to claim 3, wherein the communicating pipe (5) is provided with a guide clip (16) for guiding the movement of the operation section (10).

9. The final humidity detection device of a steam turbine according to claim 1, wherein the cover plate (7) is in threaded connection with the communicating pipe (5).

10. A steam turbine, wherein a final stage humidity detection apparatus of the steam turbine as claimed in any one of claims 1 to 9 is installed.