CN216922335U

CN216922335U - Heavy hammer jacking unit and heavy hammer shutdown device of bulb through-flow unit

Info

Publication number: CN216922335U
Application number: CN202220013356.9U
Authority: CN
Inventors: 李国才; 龙广洪; 刘永平; 侯志军
Original assignee: Hunan Liancheng Energy Development Co ltd
Current assignee: Hunan Liancheng Energy Development Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-07-08
Anticipated expiration: 2032-01-04

Abstract

The utility model discloses a heavy hammer jacking unit, which comprises a base connected with a foundation, a jacking servomotor arranged on the base through a joint bearing, a screw rod, a hydraulic cylinder and a height adjusting mechanism of a hydraulic valve component of a main valve, wherein when a speed regulator normally operates and the oil pressure is higher than the lowest operation oil pressure, pressure oil flows through the hydraulic valve of the main valve to an opening cavity of the jacking servomotor to jack the heavy hammer; when the unit has an accident, the upper computer sends out an electric signal, the electromagnetic valve of the main valve acts, the left side of the hydraulic valve of the main valve loses pressure, the valve core works on the right side under the action of differential pressure, the oil in the open cavity of the jacking servomotor is discharged through the hydraulic valve of the main valve, the heavy hammer descends by virtue of self-gravity, when the unit has an accident, the electric failure occurs, the pure mechanical hydraulic overspeed protection device acts, the left side of the hydraulic valve of the main valve loses pressure, the oil in the open cavity of the jacking servomotor works on the right side under the action of differential pressure of the valve core, the heavy hammer descends by virtue of self-gravity, and the falling time of the heavy hammer is adjusted by the time adjusting device.

Description

Heavy hammer jacking unit and heavy hammer shutdown device of bulb through-flow unit

Technical Field

The utility model relates to a bulb turbine unit, in particular to a heavy hammer jacking unit and a heavy hammer shutdown device of the bulb turbine unit.

Background

The arrangement of the water turbine speed regulation ring power connector of the bulb tubular turbine set is vertical to two arrangement forms of 90-degree angle and 45-degree angle inclined (push) pull, and the 3X 5MW bulb tubular turbine set of a certain hydropower station is designed to be in a 45-degree angle inclined (push) pull form. Due to the long-term operation of the unit, the phenomenon of uneven stress of the speed regulating ring of the water turbine gradually occurs, and after long-term action, the steel balls and the V-shaped clamping grooves are continuously abraded, particularly the steel balls in the left-lower direction (namely the steel balls in a third quadrant, wherein the quadrant is centered on the original point, and the left-lower direction is called as the third quadrant). And then arouse hydraulic turbine speed governing ring clearance constantly to increase, after the clearance is greater than normal numerical value, top steel ball will be under the effect of gravity, along with the continuous crowded down of hydraulic turbine speed governing ring action, takes place the condition that two steel balls are side by side, and then produces the jam, leads to the unable normal reliable start-stop of unit.

Therefore, it is necessary to research a unit weight jacking unit, so that the turbine governor ring does not bear the self-gravity of the weight when the turbine is started or stopped and the unit is in normal operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heavy hammer jacking unit, which can jack up a heavy hammer in the running process of a unit, a speed regulation ring of a water turbine is not influenced by the self gravity of the heavy hammer, the unbalanced stress condition of the speed regulation ring of the unit is obviously improved, the friction between the speed regulation ring and a water distribution ring outside the water turbine is reduced, when the unit has an accident, the heavy hammer jacking unit and a heavy hammer unloading valve simultaneously act, the heavy hammer rapidly falls back to a pre-reconstruction state, and the speed regulation ring rapidly closes the unit under the action of the heavy hammer, thereby preventing the accident.

In order to achieve the purpose, the utility model provides the following technical scheme:

a heavy hammer jacking unit comprises a base connected with a foundation, a jacking servomotor arranged on the base through a joint bearing, a screw rod and a height adjusting mechanism, wherein one end of the screw rod is connected with the free end of a piston rod of the jacking servomotor, and the other end of the screw rod penetrates through a heavy hammer to be connected with the height adjusting mechanism.

When the unit normally operates, the height adjusting mechanism drives the screw rod to jack the heavy hammer, so that the speed adjusting ring of the water turbine is not influenced by the self-gravity of the heavy hammer; when the unit operation appears unusually, height adjusting mechanism drives the lead screw and puts down the weight, realizes the weight shutdown.

As a further scheme, the height adjusting mechanism is a hydraulic adjusting mechanism, the hydraulic adjusting mechanism comprises a hydraulic cylinder and a main valve hydraulic valve, the main valve hydraulic valve is a two-position four-way reversing valve, the main valve hydraulic valve comprises an oil inlet, an oil outlet, a control oil port and an oil drainage port, the control oil port is communicated with the oil inlet, the oil drainage port is communicated with the oil outlet, and the control oil port and the oil drainage port are respectively communicated with the hydraulic cylinder.

The hydraulic adjusting mechanism is one of the height adjusting mechanisms, and the height adjusting mechanism can also adopt a mode that a power source is matched with the screw rod, but the hydraulic adjusting mechanism is an optimal scheme because the hydraulic adjusting mechanism can be linked with a heavy hammer shutdown system.

As a further scheme, the weight jack-up unit further comprises a mechanical overspeed protection device and a main valve solenoid valve, the mechanical overspeed protection device is connected with the weight shutdown system, the output of the mechanical overspeed protection device is communicated with the input of the main valve solenoid valve, and the output of the main valve solenoid valve is communicated with the input of the main valve hydraulic valve.

As a further scheme, the heavy hammer jacking unit further comprises a time adjusting device, and the time adjusting device consists of a one-way valve and a throttle valve which are connected in parallel. The time adjusting device adjusts the falling time of the heavy hammer.

As a further scheme, the heavy hammer jacking unit further comprises a pressure gauge, and the pressure gauge is connected to an oil inlet oil path of the main valve hydraulic valve. And the pressure state is visually displayed through a pressure gauge.

As a further scheme, travel switches are arranged at the upper limit position and the lower limit position of a piston in the hydraulic cylinder.

As a further scheme, the heavy hammer jacking unit further comprises an ear handle and an ear handle pin shaft, and the screw rod is connected with the height adjusting mechanism through the ear handle and the ear handle pin shaft.

The counter weight jacking unit is corresponding to a bulb through-flow unit counter weight shutdown device, and the bulb through-flow unit counter weight shutdown device comprises the counter weight jacking unit.

The utility model has the following beneficial effects:

when the speed regulator operates normally and the oil pressure is higher than the lowest operation oil pressure, the pressure oil flows through the main valve hydraulic valve to the jack-up servomotor opening cavity to jack up the heavy hammer; when the unit has an accident, the upper computer sends an electric signal, the main valve electromagnetic valve acts, the left side of the main valve hydraulic valve loses pressure, the valve core works on the right side under the action of differential pressure, the jacking servomotor open cavity oil is discharged through the main valve hydraulic valve, the heavy hammer descends by virtue of self gravity, when the unit has the accident, the electric failure occurs, the pure mechanical hydraulic overspeed protection device acts, the left side of the main valve hydraulic valve loses pressure, the valve core works on the right side under the action of differential pressure, the jacking servomotor open cavity oil is discharged through the hydraulic valve, the heavy hammer descends by virtue of self gravity, and meanwhile, the falling time of the heavy hammer is adjusted by the time adjusting device.

Drawings

FIG. 1 is a schematic diagram of a weight lifting unit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the operation of the weight lifting unit according to the embodiment of the present invention.

Wherein: 100. the hydraulic control device comprises a base, 200, a heavy hammer, 10, a jacking servomotor, 20, a screw rod, 21, a connecting sleeve, 22, a round nut, 30, a height adjusting mechanism, 31, a hydraulic cylinder, 32, a main valve hydraulic valve, 33, a main valve electromagnetic valve, 34, a mechanical overspeed protection device, 40, a time adjusting device, 50, a pressure gauge, 60, a travel switch, 70, an ear handle, 71 and an ear handle pin shaft.

Detailed Description

As shown in fig. 1-2, a heavy hammer jacking unit comprises a base 100 connected to a foundation, a jacking servomotor 10 mounted on the base through a joint bearing, a lead screw 20, and a height adjusting mechanism 30, wherein one end of the lead screw 20 is connected to a free end of a piston rod of the jacking servomotor 10 through a connecting sleeve 21 and fixed by a round nut 22, and the other end of the lead screw 20 passes through a heavy hammer 200 and is connected to the height adjusting mechanism 30, the hydraulic adjusting mechanism is one of the height adjusting mechanism 30, the height adjusting mechanism 30 can also adopt a mode of matching a power source with the lead screw, but the hydraulic adjusting mechanism is a preferred scheme because the hydraulic adjusting mechanism can be linked with a heavy hammer shutdown system, the hydraulic adjusting mechanism comprises a hydraulic cylinder 31, a main valve hydraulic valve 32, a main valve 33 and a mechanical overspeed protection device 34, the main valve 32 and the main valve 33 are two-position four-way directional valves, the main valve hydraulic valve 32 comprises an oil inlet, an oil outlet, a control oil port and an oil drainage port, the control oil port is communicated with the oil inlet, the oil drainage port is communicated with the oil outlet, the control oil port and the oil drainage port are respectively communicated with the hydraulic cylinder 31, the mechanical overspeed protection device 34 is connected with the heavy hammer shutdown system, the output of the mechanical overspeed protection device 34 is communicated with the input of the main valve electromagnetic valve 33, and the output of the main valve electromagnetic valve 33 is communicated with the input of the main valve hydraulic valve 32.

As shown in FIG. 2, the weight jack-up unit further comprises a time adjusting device 40, wherein the time adjusting device 40 is composed of a check valve and a throttle valve which are connected in parallel.

As shown in fig. 2, the weight jack-up unit further includes a pressure gauge 50, and the pressure gauge 50 is connected to the oil inlet path of the main valve hydraulic valve 32.

As shown in fig. 1, the upper and lower limit positions of the piston in the hydraulic cylinder 31 are provided with travel switches 60.

As shown in fig. 1, the lead screw 20 is connected to the height adjustment mechanism 30 via an ear 70 and an ear pin 71.

The working principle of the weight jack-up unit is as follows:

when the speed regulator normally runs and the oil pressure is higher than the lowest operation oil pressure, the lowest operation oil pressure of the embodiment is 4.4MPa, and when the oil pressure is higher than 4.4MPa, the pressure oil flows to the opening cavity of the jacking servomotor 10 through the main valve hydraulic valve to jack the heavy hammer 200; when the unit has an accident, the upper computer sends an electric signal, the main valve electromagnetic valve 33 operates, the left side of the main valve hydraulic valve 32 loses pressure, the valve core operates on the right side under the action of differential pressure, the oil in the open cavity of the jacking servomotor 10 is discharged through the main valve hydraulic valve 32, the heavy hammer 200 descends by virtue of self gravity, when the unit has the accident, the electric is out of order, the pure mechanical hydraulic overspeed protection device 34 operates, the left side of the main valve hydraulic valve 32 loses pressure, the oil in the open cavity of the jacking servomotor 10 operates on the right side under the action of differential pressure, the heavy hammer 200 descends by virtue of self gravity, and meanwhile, the falling time of the heavy hammer 200 is adjusted by the time adjusting device 40.

Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the utility model, and that those skilled in the art will be able to modify the utility model in its various equivalent forms without departing from the scope of the utility model as defined in the appended claims.

Claims

1. A heavy hammer jacking unit comprises a base connected with a foundation and a jacking servomotor arranged on the base through a joint bearing, and is characterized by further comprising a lead screw and a height adjusting mechanism, wherein one end of the lead screw is connected with the free end of a piston rod of the jacking servomotor, and the other end of the lead screw penetrates through the heavy hammer and is connected with the height adjusting mechanism.

2. The weight jack-up unit of claim 1, wherein the height adjustment mechanism is a hydraulic adjustment mechanism, the hydraulic adjustment mechanism comprises a hydraulic cylinder and a main valve hydraulic valve, the main valve hydraulic valve is a two-position four-way reversing valve, the main valve hydraulic valve comprises an oil inlet, an oil outlet, a control oil port and an oil drain port, the control oil port is communicated with the oil inlet, the oil drain port is communicated with the oil outlet, and the control oil port and the oil drain port are respectively communicated with the hydraulic cylinder.

3. The weight jack-up unit according to claim 2, further comprising a mechanical overspeed protection device connected to the weight shutdown system and a main valve solenoid valve, wherein the output of the mechanical overspeed protection device is connected to the input of the main valve solenoid valve, and the output of the main valve solenoid valve is connected to the input of the main valve hydraulic valve.

4. The weight jack-up unit according to claim 3, further comprising a time adjustment device consisting of a check valve and a throttle valve connected in parallel.

5. The weight jack-up unit according to claim 3, further comprising a pressure gauge connected to the oil inlet of the main valve hydraulic valve.

6. The weight jack-up unit according to any one of claims 2 to 5, wherein the hydraulic cylinder has travel switches at the upper and lower extreme positions of the piston.

7. The weight jack-up unit according to any one of claims 1 to 5, further comprising an ear and an ear pin, wherein the lead screw is connected to the height adjustment mechanism through the ear and the ear pin.

8. A device for shutting down a bulb turbine set weight, wherein the device comprises the weight jack unit of any one of claims 1 to 7.