Mechanical hydraulic system of speed regulator

Abstract

The utility model provides a speed regulator mechanical hydraulic system which comprises an oil return tank, an oil pump, a one-way valve, an energy accumulator, a first electro-hydraulic directional control valve, a guide vane closing electromagnetic valve, a guide vane opening electromagnetic valve, a second electro-hydraulic directional control valve, a sorting electromagnetic valve, an emergency shutdown electromagnetic valve, a power failure protection electromagnetic valve, a guide vane proportional valve and a guide vane servomotor. In the prior art, an oil way in a valve block is changed through electrification of an electromagnetic valve, and the mechanical hydraulic system for the speed regulator has the advantages that the oil way is changed under the condition that the electromagnetic valve is not electrified, so that the speed regulator of a unit can be changed under the electrified state and the non-electrified state; the speed regulator can enable the water guide blades on the guide vane servomotor to be automatically and rapidly closed, and the technical problem that when the speed regulator is in a power-off state, the speed regulator cannot rapidly close the water guide blades on the guide vane servomotor, so that the rotating speed of a unit is too high, and unit accidents are caused is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of governors, and particularly relates to a mechanical hydraulic system of a governor. Background Art

[0002] The turbine governor is one of the very important auxiliary control devices of the hydro-generating unit. The quality of its operation directly determines the safe and stable operation of the unit. At present, reducing the failure rate of the turbine governor is the most effective means to improve the operation reliability of the unit. The function of the turbine governor is to control the opening of the guide vane (blade) by controlling the operating oil volume of the guide vane servomotor (blade servomotor), and then control the water flow through the turbine to adjust the speed of the turbine, that is, to adjust the speed of the turbine. If the unit suddenly loses power during the load rejection process and the guide vanes of the unit cannot move, the speed of the unit will exceed the runaway speed, resulting in unit accidents.

[0003] In view of this, it is necessary to provide a new mechanical hydraulic system of a governor to overcome the above defects. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mechanical hydraulic system of a governor, which can change the oil circuit when the electromagnetic valve is de-energized, and can achieve the purpose that the governor can automatically and quickly close the guide vanes on the guide vane servomotor in both the energized and de-energized states of the unit governor, and solve the technical problem that when the governor is in the de-energized state, the governor cannot quickly close the guide vanes on the guide vane servomotor, resulting in too high a speed of the unit and causing unit accidents.

[0005] To achieve the above purpose, the technical solution provided by the utility model is realized as follows: A mechanical hydraulic system of a governor includes: an oil return tank, an oil pump, a check valve, an accumulator, a first electro-hydraulic directional valve, a guide vane closing electromagnetic valve, a guide vane opening electromagnetic valve, a second electro-hydraulic directional valve, a sorting electromagnetic valve, an emergency stop electromagnetic valve, a power failure protection electromagnetic valve, a guide vane proportional valve, and a guide vane servomotor;

[0006] The oil pump is connected to the oil return tank through a pipeline, the check valve is connected to the accumulator through a pipeline, the accumulator is connected to the first electro-hydraulic directional valve, the guide vane closing electromagnetic valve, the emergency stop electromagnetic valve, and the power failure protection electromagnetic valve through a pipeline, the emergency stop position of the sorting electromagnetic valve is connected to the emergency stop electromagnetic valve, the power failure protection position of the sorting electromagnetic valve is connected between the first electro-hydraulic directional valve and the power failure protection electromagnetic valve, the first electro-hydraulic directional valve is also connected to the guide vane closing electromagnetic valve, the guide vane opening electromagnetic valve, and the guide vane proportional valve, the guide vane closing electromagnetic valve and the guide vane opening electromagnetic valve are connected to the second electro-hydraulic directional valve, and the second electro-hydraulic directional valve and the guide vane proportional valve are connected to the guide vane servomotor.

[0007] Preferably, the governor electro-mechanical hydraulic system further includes an oil suction filter element, which is arranged in the oil return tank and connected to the oil pump.

[0008] Preferably, the governor electro-mechanical hydraulic system further includes an oil filter, which is connected between the oil pump and the check valve.

[0009] Compared with the prior art, the beneficial effects are as follows: In the prior art, the oil circuit in the valve block is changed by energizing the solenoid valve. The advantage of the governor electro-mechanical hydraulic system of the present invention is that the oil circuit can be changed when the solenoid valve is de-energized, so that the governor can automatically and quickly close the guide vane on the guide vane servomotor in both the powered and non-powered states of the unit, solving the technical problem that when the governor is in the non-powered state, the governor cannot quickly close the guide vane on the guide vane servomotor, resulting in too high a unit speed and thus causing unit accidents. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0011] Figure 1 It is a schematic structural diagram of the governor electro-mechanical hydraulic system provided by the present invention. Detailed Embodiments

[0012] In order to make the purpose, technical solutions and beneficial technical effects of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present invention and not for limiting the present invention.

[0013] Please refer to Figure 1 , the present invention provides a governor electro-mechanical hydraulic system, including: an oil return tank 1, an oil pump 3, a check valve 5, an accumulator 6, a first electro-hydraulic directional control valve 7, a closing guide vane solenoid valve 8, an opening guide vane solenoid valve 9, a second electro-hydraulic directional control valve 10, a sorting solenoid valve 11 (including an emergency stop position and a power failure protection position), an emergency shutdown solenoid valve 12, a power failure protection solenoid valve 13, a guide vane proportional valve 14, and a guide vane servomotor 15;

[0014] The oil pump 3 is connected to the oil return tank 1 through an oil pipe. The one-way valve 5 is connected to the accumulator 6 through an oil pipe. The accumulator 6 is connected to the first electro-hydraulic directional valve 7, the guide vane closing solenoid valve 8, the emergency shutdown solenoid valve 12, and the power failure protection solenoid valve 13 through an oil pipe. The emergency stop position of the sorting solenoid valve 11 is connected to the emergency stop solenoid valve 12. The power failure protection position of the sorting solenoid valve 11 is connected between the first electro-hydraulic directional valve 7 and the power failure protection solenoid valve 13. The first electro-hydraulic directional valve 7 is also connected to the guide vane closing solenoid valve 8, the guide vane opening solenoid valve 9, and the guide vane proportional valve 14. The guide vane closing solenoid valve 8 and the guide vane opening solenoid valve 9 are connected to the second electro-hydraulic directional valve 10. The second electro-hydraulic directional valve 10 and the guide vane proportional valve 14 are connected to the guide vane servomotor 15. Hydraulic oil can be temporarily stored in the accumulator 6.

[0015] In a preferred embodiment, the governor electro-mechanical hydraulic system further includes an oil suction filter element 2. The oil suction filter element 2 is arranged in the oil return tank 1 and connected to the oil pump 3.

[0016] In a preferred embodiment, the governor electro-mechanical hydraulic system further includes an oil filter 4. The oil filter 4 is connected between the oil pump 3 and the one-way valve 6.

[0017] Working principle:

[0018] When the guide vane opening solenoid valve 9 is in the open position and the guide vane closing solenoid valve 8 is in the closed position, the oil in the accumulator 6 enters the second electro-hydraulic directional valve 10 through the guide vane opening solenoid valve 9 and enters the opening oil chamber in the guide vane servomotor 15 to make the guide vane servomotor 15 act.

[0019] When the guide vane opening solenoid valve 9 is in the closed position and the guide vane closing solenoid valve 8 is in the open position, the oil in the accumulator 6 enters the second electro-hydraulic directional valve 10 through the guide vane closing solenoid valve 8 and enters the closing oil chamber in the guide vane servomotor 15 to make the guide vane servomotor 15 act.

[0020] When the first electro-hydraulic directional valve 7 acts, the sorting solenoid valve 11 is opened in the emergency stop position, and the emergency shutdown solenoid valve 12 acts. The oil in the accumulator 6 directly enters the closing oil chamber in the guide vane servomotor 15 to make the guide vane servomotor 15 quickly enter the emergency closing state, and operating other solenoid valves is ineffective.

[0021] When the first electro-hydraulic directional valve 7 acts, the sorting solenoid valve 11 is opened in the power failure protection position, and the power failure protection solenoid valve 13 is electrically actuated. The governor is in the normal working state. When the power failure protection solenoid valve 13 is de-energized and acts, the oil in the accumulator 6 directly and preferentially enters the closing oil chamber in the guide vane servomotor 15 to make the guide vane servomotor 15 quickly enter the emergency closing state, and operating other solenoid valves is ineffective.

[0022] In the prior art, the oil circuit in the valve block is changed by energizing the solenoid valve. The advantage of the governor's mechanical hydraulic system of the present invention is that by changing the oil circuit when the solenoid valve is de-energized, it can achieve the purpose that the governor can automatically and quickly close the guide vane on the guide vane servomotor in both the energized and de-energized states of the unit, solving the technical problem that when the governor is in the de-energized state, the governor cannot quickly close the guide vane on the guide vane servomotor, resulting in too high a speed of the unit and thus causing an accident to the unit.

[0023] The present invention is not limited solely to what is described in the specification and embodiments. Therefore, for those skilled in the art, additional advantages and modifications can be easily achieved. Thus, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrated examples shown and described herein.

Claims

1. A governor mechanical hydraulic system, characterized in that, Including: An oil return tank (1), an oil pump (3), a check valve (5), an accumulator (6), a first electro-hydraulic directional valve (7), a closing guide vane solenoid valve (8), an opening guide vane solenoid valve (9), a second electro-hydraulic directional valve (10), a sorting solenoid valve (11), an emergency stop solenoid valve (12), a power-off protection solenoid valve (13), a guide vane proportional valve (14), and a guide vane servomotor (15); The oil pump (3) is connected to the oil return tank (1) through a pipeline. The check valve (5) is connected to the accumulator (6) through a pipeline. The accumulator (6) is connected to the first electro-hydraulic directional valve (7), the closing guide vane solenoid valve (8), the emergency stop solenoid valve (12), and the power-off protection solenoid valve (13) through pipelines. The emergency stop position of the sorting solenoid valve (11) is connected to the emergency stop solenoid valve (12). The power-off protection position of the sorting solenoid valve (11) is connected between the first electro-hydraulic directional valve (7) and the power-off protection solenoid valve (13). The first electro-hydraulic directional valve (7) is also connected to the closing guide vane solenoid valve (8), the opening guide vane solenoid valve (9), and the guide vane proportional valve (14). The closing guide vane solenoid valve (8) and the opening guide vane solenoid valve (9) are connected to the second electro-hydraulic directional valve (10). The second electro-hydraulic directional valve (10) and the guide vane proportional valve (14) are connected to the guide vane servomotor (15).

2. The governor electro-hydraulic system according to claim 1, wherein The governor mechanical hydraulic system further includes an oil suction filter element (2). The oil suction filter element (2) is arranged in the oil return tank (1) and connected to the oil pump (3).

3. The governor mechanical hydraulic system according to claim 1, wherein, The governor mechanical hydraulic system further includes an oil filter (4). The oil filter (4) is connected between the oil pump (3) and the check valve (5).

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