CN211900706U

CN211900706U - Novel gate LVDT

Info

Publication number: CN211900706U
Application number: CN201922202755.0U
Authority: CN
Inventors: 童鑫红; 何宗源; 林宇华; 邱文赢; 高伟; 康昱; 刘龙翔; 林彩云; 谷宁
Original assignee: Fujian Huadian Kemen Power Generation Co ltd
Current assignee: Fujian Huadian Kemen Power Generation Co ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-11-10
Anticipated expiration: 2029-12-11

Abstract

The utility model relates to the technical field of steam turbine valve regulators, in particular to a novel valve regulating LVDT, which comprises a fixed plate, a LVDT shell, a limiting nut, a first self-tightening nut, a first elastic cushion, a first flat cushion, a second elastic cushion, a second self-tightening nut and an iron core; the upper part of the LVDT shell is welded on the fixing plate; the iron core penetrates through the LVDT shell; in order to limit the position of the iron core, a limiting nut is arranged on the iron core in a threaded manner; the first self-tightening nut and the second self-tightening nut are fixed on the iron core through threads. The first elastic pad, the first flat pad, the second flat pad and the second elastic pad penetrate through the iron core; the tail end of the iron core penetrates through a through hole of the door adjusting connecting rod; the first self-tightening nut, the first elastic cushion and the first flat cushion are fixed on the upper part of the door adjusting connecting rod in sequence; the second flat gasket, the second elastic gasket and the second self-tightening nut are fixed at the lower part of the door adjusting connecting rod in sequence. The utility model discloses the advantage: simple structure, simple to operate connects stably, is difficult for the pine to take off, is convenient for observe.

Description

Novel gate LVDT

Technical Field

The utility model relates to a steam turbine governing technical field specifically is a novel governing LVDT.

Background

The unit load of a power plant is usually adjusted by adjusting the opening degree of a turbine valve, and in the normal operation process, the position of the turbine valve is usually fed back to a DEH system through a Linear Variable Differential Transformer (LVDT) for the DEH system to judge and adjust. Along with the continuous deepening of the coal-fired unit participating in the auxiliary service, under the AGC mode, the unit can change more frequently along with the power grid instruction, and in addition to the vibration of the on-site gate adjusting, the nut at the joint of the LVDT and the gate adjusting connecting rod is easy to loosen, so that the load change of the unit is also caused. The small-machine low-speed regulating gate of the power plant also has the problems that once the LVDT is loosened from the connecting rod of the regulating gate, tripping operation is caused, so that a unit RB appears, a large amount of load shedding is realized, and the unit is not stopped under severe conditions.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel accent LVDT to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a novel adjustable gate LVDT comprises a fixed plate, an LVDT shell, a limiting nut, a first self-tightening nut, a first elastic cushion, a first flat cushion, a second elastic cushion, a second self-tightening nut and an iron core; the upper part of the LVDT shell is welded on the fixing plate; the iron core penetrates through the LVDT shell; in order to limit the position of the iron core, a limiting nut is arranged on the iron core in a threaded manner; the first self-tightening nut and the second self-tightening nut are fixed on the iron core through threads.

The first elastic pad, the first flat pad, the second flat pad and the second elastic pad penetrate through the iron core; the tail end of the iron core penetrates through a through hole of the door adjusting connecting rod; the first self-tightening nut, the first elastic cushion and the first flat cushion are fixed on the upper part of the door adjusting connecting rod in sequence; the second flat gasket, the second elastic gasket and the second self-tightening nut are fixed at the lower part of the door adjusting connecting rod in sequence.

As a further aspect of the present invention: equidistant screw holes are formed in the left side and the right side of the fixing plate, so that the LVDT can be fixed conveniently.

As a further aspect of the present invention: the iron core is cylindrical, and the surface is equipped with the screw thread of equidistance, and the external diameter is 6 mm.

As a further aspect of the present invention: the inner diameter of the first self-tightening nut and the inner diameter of the second self-tightening nut are 6mm, and the outer diameter of the first self-tightening nut and the outer diameter of the second self-tightening nut are 10 mm.

As a further aspect of the present invention: the surfaces of the first self-tightening nut and the second self-tightening nut are coated with fluorescent materials, so that the positions of the first self-tightening nut and the second self-tightening nut can be observed conveniently.

As a further aspect of the present invention: the internal diameters of the first elastic cushion, the second elastic cushion, the first flat cushion and the second flat cushion are 6 mm.

As a further aspect of the present invention: the outer diameters of the first flat gasket and the second flat gasket are larger than the diameter of the through hole of the door adjusting connecting rod.

As a further aspect of the present invention: in order to prevent the self-tightening nut from failing, the tail end of the iron core is provided with a transverse through hole with the diameter of 2mm, a bolt penetrates through the transverse through hole to be fixed, one end of the bolt is fixedly connected with the fixed end of a bolt safety belt, and after the tail end of the iron core at the end through which the bolt penetrates is transversely perforated, a ring at the free end of the bolt safety belt is hung at the other end of the bolt.

Compared with the prior art, the beneficial effects of the utility model are that: this novel accent door LVDT can effectively cushion the vibrations of accent door through the bullet pad, utilizes the iron core and the accent door connecting rod that self-tightening nut can effectively fix LVDT, is difficult to the pine and takes off, and LVDT's iron core bottom is equipped with the cross bore, is equipped with safeties on the cross bore, in case self-tightening nut became invalid, the bolt on the cross bore can play double guard action. Scribble fluorescent material on the self-clinching nut, the operating personnel can be better at the observation accent door connecting rod that patrols and examines and the direct connected state of LVDT, the nut pine takes off the condition. The utility model discloses the advantage: simple structure, simple to operate connects stably, is difficult for the pine to take off, is convenient for observe.

Drawings

Fig. 1 is a schematic structural diagram of a novel variable valve LVDT.

Fig. 2 is a schematic structural diagram of a safety device in the novel variable valve LVDT.

In the figure, a fixed plate 1, an LVDT shell 2, a first self-tightening nut 3, a first elastic cushion 4, a first flat cushion 5, a door adjusting connecting rod 6, a second flat cushion 7, a second elastic cushion 8, a second self-tightening nut 9, an iron core 10, a bolt 11, a bolt safety belt 12 and a limiting nut 13.

Detailed Description

In order to clearly understand the technical features, objects and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.

Example 1

Referring to fig. 1, a novel variable valve LVDT includes a fixed plate 1, an LVDT housing 2, a limit nut 13, a first self-tightening nut 3, a first elastic pad 4, a first flat pad 5, a second flat pad 7, a second elastic pad 8, a second self-tightening nut 9, and an iron core 10; the upper part of the LVDT shell 2 is welded on the fixed plate 1; the iron core 10 penetrates through the LVDT shell 2; in order to limit the position of the iron core 10, a limit nut 13 is arranged on the iron core 10 in a threaded manner; the first self-tightening nut 3 and the second self-tightening nut 9 are fixed on the iron core 10 through threads.

The first elastic pad 4, the first flat pad 5, the second flat pad 7 and the second elastic pad 8 penetrate through the iron core 10; the tail end of the iron core 10 penetrates through a through hole of the door adjusting connecting rod 6; the first self-tightening nut 3, the first elastic cushion 4 and the first flat cushion 5 are fixed on the upper part of the door adjusting connecting rod 6 in sequence; the second flat pad 7, the second elastic pad 8 and the second self-tightening nut 9 are fixed on the lower part of the door adjusting connecting rod 6 in sequence.

Preferably, the left side and the right side of the fixing plate 1 are provided with equidistant screw holes, so that the LVDT can be fixed conveniently.

Preferably, the iron core 10 is cylindrical, and has a surface provided with equidistant threads and an outer diameter of 6 mm.

Preferably, the first self-tightening nut 3 and the second self-tightening nut 9 have an inner diameter of 6mm and an outer diameter of 10 mm.

Preferably, the first self-tightening nut 3 and the second self-tightening nut 9 are coated with a fluorescent material on their surfaces to facilitate observation of their positions.

Preferably, the inner diameters of the first elastic cushion 4, the second elastic cushion 8, the first flat cushion 5 and the second flat cushion 7 are 6 mm.

Preferably, the outer diameters of the first flat pad 5 and the second flat pad 7 are larger than the diameter of the through hole of the throttle connecting rod 6.

Example 2

Referring to fig. 2, on the basis of embodiment 1, in order to prevent the self-tightening nut from failing, a transverse hole with a diameter of 2mm is formed at the end of the iron core 10, the bolt 11 is fixed by penetrating the transverse hole, one end of the bolt 11 is fixedly connected with the fixed end of the bolt safety belt 12, and after the bolt 11 penetrates the transverse hole at the end of the iron core 10, the ring at the free end of the bolt safety belt 13 is hung at the other end of the bolt 11.

Preferably, the safety belt 13 is made of high temperature resistant rubber, has elasticity, and has a length consistent with that of the bolt 11.

This novel accent door LVDT has used more than half a year at the on-the-spot unit, and under the AGC circumstances of throwing, the frequent undulant condition of accent door is for taking place LVDT and the condition of taking off of accent door connecting rod pine, and the operating personnel can both observe the condition of being connected of accent door connecting rod and LVDT smoothly patrolling and examining the in-process.

The utility model discloses a theory of operation is: inside the LVDT shell 2 was run through to

iron core

10, and 13 threaded connection of stop nut on iron core 10, iron core 10 connect gradually first from tight nut 3, first bullet pad 4, first flat pad 5, and iron core 10 passes adjusting a connecting rod 6, and second flat pad 7, second bullet pad 8, second in proper order again are from tight nut 9. The bolt 11 penetrates through the transverse through hole for fixing, one end of the bolt 11 is fixedly connected with the fixed end of the bolt safety belt 12, and after the end of the iron core 10 at one end, through which the bolt 11 penetrates, penetrates through the transverse through hole, the circular ring at the free end of the bolt safety belt 12 is hung at the other end of the bolt 11.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, modifications and substitutions can be made, which are all within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A novel gate-adjusting LVDT comprises a fixing plate (1), an LVDT shell (2), a limiting nut (13), a first self-tightening nut (3), a first elastic cushion (4), a first flat cushion (5), a second flat cushion (7), a second elastic cushion (8), a second self-tightening nut (9) and an iron core (10), and is characterized in that the upper part of the LVDT shell (2) is fixed on the fixing plate (1), the iron core (10) penetrates through the LVDT shell (2), the limiting nut (13) is arranged on the iron core (10) in a threaded mode in order to limit the position of the iron core (10), and the first self-tightening nut (3) and the second self-tightening nut (9) are fixed on the iron core (10) through threads;

the first elastic pad (4), the first flat pad (5), the second flat pad (7) and the second elastic pad (8) penetrate through the iron core (10); the tail end of the iron core (10) penetrates through a through hole of the door adjusting connecting rod (6); a first self-tightening nut (3), a first elastic cushion (4) and a first flat cushion (5) are fixed on the upper part of the door adjusting connecting rod (6) in sequence; the second flat cushion (7), the second elastic cushion (8) and the second self-tightening nut (9) are fixed on the lower part of the door adjusting connecting rod (6) in sequence.

2. The LVDT of claim 1, wherein the LVDT housing (2) is welded to the anchor plate (1).

3. The novel adjustable gate LVDT of claim 1, wherein the left and right sides of the fixed plate (1) are provided with equidistant screw holes for fixing the LVDT.

4. The LVDT according to claim 1, wherein the core (10) is cylindrical and has equally spaced threads on its surface and an outside diameter of 6 mm.

5. The LVDT according to claim 4, wherein the first and second self-tightening nuts (3, 9) have an inner diameter of 6mm and an outer diameter of 10 mm.

6. The LVDT of claim 5, wherein the first self-tightening nut (3) and the second self-tightening nut (9) are coated with fluorescent material.

7. The LVDT of claim 4, wherein the inner diameters of the first spring washer (4), the second spring washer (8), the first flat washer (5) and the second flat washer (7) are 6 mm.

8. The LVDT of claim 6, wherein the outer diameters of the first and second flat cushions (5, 7) are larger than the diameter of the through hole of the connecting rod (6).

9. The LVDT of any one of claims 1-8, wherein the end of the core (10) is provided with a transverse hole with a diameter of 2mm, the pin (11) is fixed through the transverse hole, one end of the pin (11) is fixedly connected with the fixed end of the pin safety belt (12), and the ring at the free end of the pin safety belt (12) is hung at the other end of the pin (11).