阅读说明：本技术 大型水轮发电机组测速装置接近开关调距模件 (Proximity switch distance-adjusting module of large hydroelectric generating set speed measuring device ) 是由 王毅 高菘 付恩狄 姚明亮 杨虎 张龙浩 张勇 梁宇柔 黄果芳 彭伟军 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种大型水轮发电机组测速装置接近开关调距模件,用于调节接近开关与水轮机大轴的测速齿盘之间的安装距离,所述大型水轮发电机组测速装置接近开关调距模件包括能与测速齿盘的外周面形状相适配的圆弧板,以及设置在圆弧板内侧且与测速齿盘的槽相适配的凸起；所述圆弧板的厚度等于设定的接近开关与测速齿盘之间的安装距离。本发明提高了接近开关的安装精度和工作效率。(The invention discloses a proximity switch distance-adjusting module of a speed measuring device of a large-scale hydroelectric generating set, which is used for adjusting the installation distance between a proximity switch and a speed measuring fluted disc of a hydraulic turbine main shaft, and comprises an arc plate which can be matched with the shape of the outer peripheral surface of the speed measuring fluted disc, and a bulge which is arranged on the inner side of the arc plate and is matched with the groove of the speed measuring fluted disc; the thickness of the arc plate is equal to the installation distance between the set proximity switch and the speed measuring fluted disc. The invention improves the installation precision and the working efficiency of the proximity switch.)

1. The utility model provides a large-scale hydroelectric set speed sensor proximity switch roll adjustment module for adjust proximity switch (6) and the installation distance between speed measuring fluted disc (3) of hydraulic turbine main shaft, its characterized in that: the proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device comprises an arc plate (1) which can be matched with the shape of the outer peripheral surface of a speed measuring fluted disc (3), and a bulge (2) which is arranged on the inner side of the arc plate (1) and is matched with a groove (5) of the speed measuring fluted disc (3);

the thickness of the arc plate (1) is equal to the installation distance between the set proximity switch (6) and the speed measuring fluted disc (3).

2. The proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device according to claim 1, wherein: the arc plates (1) are positioned on the left wing part and the right wing part of the bulge (2) and can respectively cover half teeth (4) of the speed measuring fluted disc (3).

3. The proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device according to claim 1 or 2, wherein: the arc plate (1) and the bulge (2) are integrally formed.

Technical Field

The invention belongs to the technical field of hydroelectric automatic devices of hydroelectric generating sets, and particularly relates to a proximity switch distance adjusting module of a speed measuring device of a large hydroelectric generating set.

Background

A mechanical rotating speed measuring device of a water turbine of a #1F- #6F unit of a Tiandi power plant is a mode that four proximity switches arranged on the side surface of a large shaft of the water turbine of a waterwheel room monitor the cutting of a fluted disc when the unit rotates, and the measurement of the mechanical rotating speed of the unit is realized through the conversion of a monitoring device.

According to the operation test data of the equipment, the tooth surface space between a proximity switch of the rotating speed measuring device and a speed measuring fluted disc (the speed measuring fluted disc is sleeved on a water turbine main shaft of a waterwheel chamber) is 4mm, the stability of the rotating speed data of the unit is the best, on the basis, the higher the installation precision of the proximity switch is, the higher the speed measuring precision is, and the more stable the operation of the monitoring device is.

The diameter of the large shaft of the water turbine is 1200mm, the fluted disc consists of 30 teeth and grooves with the width of 70.7mm, and the groove surface and the tooth surface are both planes instead of concentric circles with the surface of the large shaft of the water turbine, so that the error is 0.83 mm. The speed measuring device is overhauled and maintained during annual overhaul, and the shutdown position is a random position, so that the proximity switch is opposite to the tooth or the groove and is random. In order to simulate the cambered surface with the concentric radius of 679mm with the large shaft as much as possible, two debuggers are needed to repeatedly adjust the installation position of the proximity switch and then repeatedly check the installation position. The whole process takes about 120 minutes, which is a straight-line period for unit commissioning.

Therefore, a large hydroelectric generating set speed measuring device proximity switch distance adjusting module needs to be designed.

Disclosure of Invention

The invention aims to provide a proximity switch distance-adjusting module of a speed-measuring device of a large-scale hydroelectric generating set, which is used for adjusting the installation distance between a proximity switch and a speed-measuring fluted disc of a water turbine main shaft and can improve the installation precision and the working efficiency of the proximity switch.

The proximity switch distance-adjusting module of the speed measuring device of the large-scale hydroelectric generating set is used for adjusting the installation distance between a proximity switch and a speed measuring fluted disc of a water turbine main shaft, and comprises an arc plate which can be matched with the shape of the outer peripheral surface of the speed measuring fluted disc and a bulge which is arranged on the inner side of the arc plate and is matched with the groove of the speed measuring fluted disc;

the thickness of the arc plate is equal to the installation distance between the set proximity switch and the speed measuring fluted disc.

Furthermore, the arc plates are positioned on the left wing part and the right wing part of the bulge and can respectively cover half teeth of the speed measuring fluted disc.

Further, the arc plate and the protrusion are integrally formed.

The invention has the beneficial effects that:

(1) the method improves the finishing quality and efficiency of debugging work, and eliminates errors caused by personnel difference;

(2) the checking and acceptance of work can be facilitated;

(3) the disassembly and assembly times of the proximity switch are reduced, and the service life of the proximity switch is prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a proximity switch distance adjusting module of the speed measuring device of the large hydroelectric generating set and a speed measuring fluted disc of a water turbine main shaft;

FIG. 3 is a state diagram of the present invention in use;

in the figure: 1. the device comprises an arc plate, 2, protrusions, 3, a speed measuring fluted disc, 4, teeth, 5, grooves, 6, a proximity switch, 7 and a mounting bracket.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the proximity switch distance-adjusting module of the speed measuring device of the large-scale hydroelectric generating set is used for adjusting the installation distance between a proximity switch 6 and a speed measuring fluted disc 3 of a water turbine main shaft, and comprises an arc plate 1 which can be matched with the outer peripheral surface shape of the speed measuring fluted disc 3, and a protrusion 2 which is arranged on the inner side of the arc plate 1 and is matched with a groove 5 of the speed measuring fluted disc 3. The thickness of the arc plate 1 is equal to the set installation distance between the proximity switch 6 and the speed measuring fluted disc 3.

In this embodiment, since the groove surface of the groove 5 of the speed measuring fluted disc 3 is a plane, the top surface of the protrusion 2 is also a plane, so as to ensure that the proximity switch distance adjusting module of the speed measuring device of the large-sized hydroelectric generating set and the speed measuring fluted disc 3 can be completely attached together.

In this embodiment, the arc plate 1 and the protrusion 2 are integrally formed. The surface of the proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device needs to have enough hardness so as to ensure that the proximity switch distance adjusting module is not scratched by hands, tools or other elements in the debugging process. The proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device also needs to have enough toughness to ensure that the proximity switch distance adjusting module does not deform or break under the condition of external force during debugging. The proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device also needs to have enough strength and can restore to the original state after being deformed by external force.

The rotation speed of the water turbine generator set is an important parameter of the running state of the water turbine generator, and the water turbine generator set of the Tiandi power plant monitors the rotation speed of the set through 4 proximity switches 6 arranged on the side surface of a large shaft of a water turbine chamber. The proximity switch 6 is fixed on the flying pendulum base through a mounting bracket 7. The proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device can adjust the installation positions of two proximity switches 6 at each time, and after the installation positions of two proximity switches 6 are adjusted, the proximity switch distance adjusting module of the large hydroelectric generating set speed measuring device can adjust the positions of the other two proximity switches 6.

As shown in fig. 2 and 3, the specific process of adjusting the installation distance between the proximity switch 6 and the speed measuring fluted disc 3 by using the proximity switch distance adjusting module of the speed measuring device of the large hydroelectric generating set is as follows:

firstly, the part of a bulge 2 of a proximity switch distance adjusting module of a speed measuring device of a large hydroelectric generating set is placed into a groove 5 of a speed measuring fluted disc 3, and after the bulge 2 is placed into the groove 5 of the speed measuring fluted disc 3, the left and right wing parts of the arc plate 1 positioned on the bulge 2 respectively cover half teeth 4 of the speed measuring fluted disc 3. And then adjusting the mounting positions of the proximity switches 6 one by one to enable the probes of the proximity switches 6 to be in contact with the outer side surface of the arc-shaped plate 2.