Water turbine set brake air brake state indicating device easy to maintain

Abstract

A hydraulic turbine set brake air brake state indicating device easy to maintain comprises a U-shaped support, a travel switch, an L-shaped support, a lifting platform, a sleeve and a graduated scale. The L-shaped support is connected with an upper platen of the lifting platform, the travel switch is connected with the L-shaped support, a contact of the travel switch faces the U-shaped support on the upper portion, the sleeve is connected with the U-shaped support, the graduated scale is located on one side of the lifting platform, and the upper end of the graduated scale extends into the sleeve. The upper platen of the lifting platform is driven to lift by rotating the screw rod, so that the contact of the travel switch is close to or far away from the U-shaped bracket; even if the water turbine runs, operation can be carried out, conventional adjustment and maintenance can be carried out, other tools are not needed, and operation is easy and convenient; meanwhile, adjustment is carried out in the area away from the air brake, and the safety of operators is guaranteed; the distance between the air brake flashboard and the air brake base and the distance between the travel switch and the air brake base can be measured and can be used as a reference basis for air brake action condition judgment and travel switch position adjustment.

Description

Technical Field

[0001] The utility model belongs to the technical field of water turbine air brakes, and relates to a state indicating device for the braking air brakes of a water turbine unit that is easy to maintain. Background Technique

[0002] The air brake braking system is an important device during the shutdown process of a water turbine generator unit. When the rotational speed of the generator drops to a certain range during the shutdown process, the air brakes are put into use, which can effectively reduce the shutdown time, reduce the wear of the unit bearings, and reduce the overheating and burning of the bearings caused by friction at low rotational speeds. The air brake system generally consists of a brake plate device, upper and lower air intake chambers, air brake air system pipelines, air brake position contacts, travel switches, etc. For each unit, due to different models, the number of brake plates and air brake position contacts is different, generally ranging from 12 to 36 sets.

[0003] Currently, a position travel switch is usually used to convert the displacement signal of the air brake into a digital electrical signal, and then it is sent to the monitoring system through hard wiring as the basis for the activation and withdrawal of the air brake. Its installation method is generally to fixedly install the travel switch on a bracket, and install a fixed rigid pressure plate or a bar on the brake plate of the braking air brake. The pressure plate or the bar will move up and down with the movement of the air brake body. When the pressure plate or the bar moves to a certain fixed position, it will trigger the action of the travel switch, and the normally open or normally closed contacts inside the travel switch will change positions; when the pressure plate or the bar leaves the travel switch by a certain distance, the action of the travel switch returns, and the change of the normally open or normally closed contacts inside also returns, thus realizing the conversion of the actual position signal of the braking air brake from a mechanical signal to an electrical signal.

[0004] The air brake travel switch is generally installed on a fixed bracket. Usually, tools such as wrenches are required to adjust and install the travel switch. Adjusting the travel switch is not simple enough, and it is possible that the tools are lost near the rotor in the wind tunnel, bringing huge potential safety hazards to the operation of the unit; at the same time, when the unit is running, the generator rotor rotates at a high speed. If the state display of an individual air brake is abnormal due to the improper action of the travel switch, since the air brake is too close to the rotor at this time, it is difficult to adjust the air brake travel switch, and it can only be maintained when the unit is shut down, which may cause the unit to run with "hidden troubles" for a long time; in addition, after the air brake plate moves, there is no easily obtainable quantitative value for the displacement, and after the travel switch is adjusted in place, there is no reference position parameter to provide a reference basis for the next adjustment. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a state indicating device for the braking air brakes of a water turbine unit that is easy to maintain, measure the distance between the air brake plate and the air brake base, as well as the distance between the travel switch and the air brake base, as a reference basis for judging the action of the air brake and adjusting the position of the travel switch.

[0006] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: An easy-to-maintain braking air brake state indicating device for a water turbine unit, which comprises a U-shaped bracket, a travel switch, an L-shaped bracket, a lifting platform, a sleeve and a scale; the L-shaped bracket is connected to the upper plate of the lifting platform, the travel switch is connected to the L-shaped bracket and the contact of the travel switch faces the upper U-shaped bracket, the sleeve is connected to the U-shaped bracket, and the scale is located on one side of the lifting platform and the upper end extends into the sleeve.

[0007] A pointer is provided on one side of the upper plate of the lifting platform, and the pointer points to the scale on the scale.

[0008] The base of the lifting platform is connected to a slider, and the slider is slidably matched with a slide rail.

[0009] One end of the slide rail is connected to the scale.

[0010] The main beneficial effects of the present utility model are as follows:

[0011] Manual adjustment of the lifting platform screw can complete the routine adjustment and maintenance of the travel switch, without tools, simple and convenient.

[0012] The travel switch is detachable and easy to maintain. It can still be carried out under working conditions such as the operation of the water turbine unit, and can be carried out at a certain distance from the rotor, improving the safety of maintenance personnel.

[0013] It can measure the displacement of the air brake gate plate to judge the action of the air brake; it can measure the relative position of the travel switch.

[0014] It can measure the distance between the air brake gate plate and the air brake base, as well as the distance between the travel switch and the air brake base, which can be used as a reference for judging the action of the air brake and adjusting the position of the travel switch. The device is simple and flexible to adjust, while broadening the maintenance conditions, providing a quantitative reference for the action of the air brake, and improving the safety and convenience of personnel maintenance. Description of the Drawings

[0015] The present utility model will be further described below with reference to the drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of the present utility model.

[0017] In the figure: U-shaped bracket 1; travel switch 2; L-shaped bracket 3; lifting platform 4; sleeve 5; scale 6; pointer 7; slider 8; slide rail 9. Specific Embodiments

[0018] As Figure 1Among them, an easy-to-maintain braking air brake state indicating device for a water turbine unit, which includes a U-shaped bracket 1, a travel switch 2, an L-shaped bracket 3, a lifting platform 4, a sleeve 5 and a scale 6; the L-shaped bracket 3 is connected to the upper plate of the lifting platform 4, the travel switch 2 is connected to the L-shaped bracket 3 and the contact of the travel switch 2 faces the upper U-shaped bracket 1, the sleeve 5 is connected to the U-shaped bracket 1, and the scale 6 is located on one side of the lifting platform 4 and the upper end extends into the sleeve 5.

[0019] Preferably, the U-shaped bracket 1 is fixed to the lower part of the brake plate of the air brake.

[0020] Preferably, the lifting platform 4 is a hinged lifting platform, including a hinge connecting the upper plate and the base, two connecting rods are arranged on both sides of the middle of the hinge and connected to the hinge point, a screw passes through one of the connecting rods and is in threaded cooperation with the other connecting rod, and rotating the screw drives the hinge to fold and stretch, pushing the upper plate to lift.

[0021] In a preferred solution, a pointer 7 is provided on one side of the upper plate of the lifting platform 4, and the pointer 7 points to the scale on the scale 6.

[0022] Preferably, when the upper plate rises and falls, the pointer 7 rises and falls with the upper plate and points to the scale on the scale 6.

[0023] In a preferred solution, the base of the lifting platform 4 is connected to a slider 8, and the slider 8 is slidably matched with a slide rail 9.

[0024] Preferably, the slide rail 9 is fixed to the air brake base, and when the slider 8 slides, it drives the lifting platform 4 to slide.

[0025] In a preferred solution, one end of the slide rail 9 is connected to the scale 6.

[0026] Preferably, the scale 6 is connected to the slide rail 9, the sleeve 5 and the scale 6 are sleeved, and the sleeve 5 is fixed on the U-shaped bracket 1, and the U-shaped bracket 1 is fixed to the lower part of the brake plate of the air brake, which is convenient for measuring the displacement of the air brake plate.

[0027] Preferably, a locking screw is provided on the slider 8, and by rotating the locking screw, it abuts against the slide rail 9 to limit the sliding of the slider 8.

[0028] Preferably, when the travel switch 2 needs to be replaced, the locking state of the slider 8 and the slide rail 9 is released, and the lifting platform 4 is pushed to slide along the slide rail 9 to the safe area of the air brake for replacement, and the operation is safe and reliable.

[0029] The principle of the above technical solution is:

[0030] The upper platform of the lifting platform 4 is lifted or lowered by rotating the screw rod, so that the contact of the travel switch 2 approaches or moves away from the U-shaped bracket 1. Even when the water turbine is running, the operation can be carried out for routine adjustment and maintenance without other tools, and the operation is simple and convenient; at the same time, the adjustment is carried out in the area far from the air brake, ensuring the safety of the operator.

[0031] When the upper platform of the lifting platform 4 is lifted or lowered, the pointer 7 rises and falls with the upper platform and points to the scale on the scale 6, which can measure the displacement of the air brake gate and judge the operation of the air brake; it can also measure the relative position of the travel switch 2.

[0032] Since the sleeve 5 and the scale 6 are sleeved, and the sleeve 5 is fixed on the U-shaped bracket 1, and the scale 6 is connected to the slide rail 9, the distance between the air brake gate and the air brake base, and the distance between the travel switch 2 and the air brake base can be measured, which can be used as a reference for judging the operation of the air brake and adjusting the position of the travel switch.

[0033] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The embodiments in this application and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An easy-to-maintain state indicating device for the braking air brakes of a water turbine unit, characterized in that: It includes a U-shaped bracket (1), a travel switch (2), an L-shaped bracket (3), a lifting platform (4), a sleeve (5) and a scale (6); the L-shaped bracket (3) is connected to the upper platform of the lifting platform (4), the travel switch (2) is connected to the L-shaped bracket (3) and the contact of the travel switch (2) faces the upper U-shaped bracket (1), the sleeve (5) is connected to the U-shaped bracket (1), and the scale (6) is located on one side of the lifting platform (4) and the upper end extends into the sleeve (5).

2. The easy-to-maintain water turbine unit braking air brake state indicating device according to claim 1, characterized in that: A pointer (7) is provided on one side of the upper platform of the lifting platform (4), and the pointer (7) points to the scale on the scale (6).

3. The easy-to-maintain water turbine unit braking air brake state indicating device according to claim 1, characterized in that: The base of the lifting platform (4) is connected to a slider (8), and the slider (8) is in sliding fit with a slide rail (9).

4. The easy-to-maintain braking air brake state indicating device for a water turbine unit according to claim 3, characterized in that: One end of the slide rail (9) is connected to the scale (6).

Images