CN212027975U - Main distributing valve and accident distributing valve integral type speed regulator among hydraulic power plant's speed governing system - Google Patents
Main distributing valve and accident distributing valve integral type speed regulator among hydraulic power plant's speed governing system Download PDFInfo
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- CN212027975U CN212027975U CN202020643690.3U CN202020643690U CN212027975U CN 212027975 U CN212027975 U CN 212027975U CN 202020643690 U CN202020643690 U CN 202020643690U CN 212027975 U CN212027975 U CN 212027975U
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- 238000004033 diameter control Methods 0.000 claims 2
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- 238000009434 installation Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 68
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/20—Hydro energy
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Abstract
The utility model discloses a main distributing valve and accident distributing valve integrated speed regulator in a hydraulic power plant speed regulating system, which is characterized in that the speed regulator comprises a main distributing valve with a piston structure and an accident distributing valve with a piston structure, and a plunger in the main distributing valve and a plunger in the accident distributing valve are arranged in parallel; the main pressure distributing valve comprises a main starting cavity and a main closing cavity which are positioned in the middle of the plunger, and two ends of the main starting cavity and the main closing cavity are respectively provided with a main oil drainage cavity; a safe startup cavity, a safe shutdown cavity and a safe oil discharge cavity are arranged in the accident pressure distribution valve, and a pressure oil cavity is arranged between the safe startup cavity and the safe shutdown cavity. The speed regulator has a more compact structure, the main pressure distribution valve and the accident pressure distribution valve can be arranged in the same speed regulating cabinet, and the problem that the accident pressure distribution valve cannot be arranged due to site limitation is solved; the work of piping, later maintenance and the like during the installation of the accident pressure distribution valve is reduced; the stability of the action of the whole combination is further improved.
Description
Technical Field
The utility model relates to a hydroelectric power generation control equips the technique, especially a main distributing valve and accident distributing valve integral type speed regulator among hydraulic power plant's speed governing system.
Background
The governor of the hydraulic turbine is one of the important auxiliary control equipment of the hydroelectric generating set, and the quality of its operation directly determines the safe and stable operation of the set. Reducing the fault rate of the governor of the hydraulic turbine is the most effective means for improving the operational reliability of the unit. If the speed regulator only has a main distributing valve and is not provided with an accident distributing valve, the system reliability is low, and when the main distributing valve has a card issuing fault, the water-turbine generator set cannot regulate the flow and cannot be shut down, so that serious accidents such as unit runaway and the like can occur. In consideration of the operation safety of the governor, the water turbine governor system needs to be provided with an accident pressure distributing valve. In the prior art, the accident pressure distribution valve and the main pressure distribution valve are connected in parallel, and the main pressure distribution valve and the accident pressure distribution valve act under normal operation and accident conditions respectively so as to achieve the purpose of controlling the servomotor. The method is that the accident pressure distributing valve is arranged on an oil pipeline from the speed regulator to the servomotor, and the oil pipeline behind a main oil inlet valve of the speed regulator is divided into two paths, wherein one path is connected to the speed regulator and the other path is connected to the accident pressure distributing valve. The speed regulator controls the relay to be opened and closed through main distribution action according to the regulating signal when the unit normally operates, and the accident distribution valve directly controls the relay to be closed when an abnormal condition occurs. The two valves are connected by the high-pressure oil pipe, the assembly process is complicated, the occupied area is too large, and especially for some hydropower stations designed according to the old standard, the installation space of the accident pressure distribution valve is not available at all; in addition, the two-valve speed regulator has the advantages that the instantaneous flow of an oil pipe is large when the emergency pressure distribution valve acts, so that the vibration is huge, the problems of oil pipe damage, oil leakage and the like easily occur, once the problems occur, if the problems need to be repaired, the machine must be stopped for pressure relief, a pipeline is disassembled, hydraulic oil can be reliably cleaned, the hydraulic oil can be subjected to repair welding, and the unit calling time is seriously influenced; if the treatment is not timely, serious faults such as pressure loss of the speed regulating system of the water turbine generator set can be caused, and the safe operation of the set is not facilitated.
Disclosure of Invention
The utility model aims at solving the above problem, provide a main distributing valve and accident distributing valve integral type speed regulator among hydraulic power plant's speed governing system, it has small, does not have middle oil circuit, characteristics such as stability height.
The above technical problem of the present invention can be solved by the following technical solutions: a main distributing valve and accident distributing valve integrated speed regulator in a hydraulic power plant speed regulating system is characterized by comprising a main distributing valve with a piston type structure and an accident distributing valve with a piston type structure, wherein a plunger in the main distributing valve and a plunger in the accident distributing valve are arranged in parallel; the main pressure distributing valve comprises a main starting cavity and a main closing cavity which are positioned in the middle of the plunger, and two ends of the main starting cavity and the main closing cavity are respectively provided with a main oil drainage cavity; a safe startup cavity, a safe shutdown cavity and a safe oil discharge cavity are arranged in the accident pressure distribution valve, and a pressure oil cavity is arranged between the safe startup cavity and the safe shutdown cavity.
In the speed regulator integrating the main pressure distribution valve and the accident pressure distribution valve in the speed regulating system of the hydraulic power plant, preferably, one end of the main pressure distribution valve and one end of the accident pressure distribution valve are provided with the guide valves, and the two guide valves are communicated.
In the integral speed regulator of the main distributing valve and the accident distributing valve in the speed regulating system of the hydraulic power plant, as the optimization, one end of the main distributing valve and one end of the accident distributing valve are provided with the small-caliber control oil pipe, and the external electromagnetic valve controls the guide valve at one end of the main distributing valve and one end of the accident distributing valve through the small-caliber control oil pipe.
In the speed regulator integrating the main distributing valve and the accident distributing valve in the speed regulating system of the hydraulic power plant, preferably, the diameter of the small-caliber control oil pipe is less than or equal to one third of the diameter of the main oil duct.
In the speed regulator integrating the main pressure distribution valve and the accident pressure distribution valve in the speed regulation system of the hydraulic power plant, preferably, main oil discharge cavities respectively arranged at two ends of a main starting cavity and a main stopping cavity in the main pressure distribution valve are communicated in the valve body and uniformly flow back to a zero pressure area.
In the speed regulator integrating the main pressure distribution valve and the accident pressure distribution valve in the speed regulating system of the hydraulic power plant, preferably, the main pressure distribution valve and the accident pressure distribution valve are of an integrated structure.
In the speed regulator integrating the main pressure distribution valve and the accident pressure distribution valve in the speed regulation system of the hydraulic power plant, preferably, the main pressure distribution valve and the accident pressure distribution valve are a combination of two single valve bodies which are matched with each other.
According to the technical scheme, the valve body with the piston structure is adopted, the main pressure distribution valve functional area and the accident pressure distribution valve functional area are arranged in parallel, then a main starting cavity in the main pressure distribution valve is directly communicated with a safe starting cavity in the accident pressure distribution valve, a main closing cavity in the main pressure distribution valve is directly communicated with a safe closing cavity in the accident pressure distribution valve, and the safe oil discharge cavities of the main starting cavity and the accident pressure distribution valve are communicated and combined to be matched with a servomotor pressure oil pipe, so that the number of matched pipes is reduced, and the working pressure during installation of the speed regulator is reduced. Structurally, an oil pipe for controlling the accident pressure distribution valve is designed to be a small oil pipe, control oil enters the upper end of a piston of the accident pressure distribution valve through the small-caliber oil pipe, the stress area is increased, the guide valve is controlled to increase in a second-stage mode, the main piston rod is driven by the guide valve to change the trend of an oil way, and the action stability of the accident pressure distribution valve is improved.
According to the principle of the scheme, the main pressure distribution valve and the accident pressure distribution valve can be designed into an integrated structure, so that the plungers and the internal straight oil ducts which are arranged in parallel are more reasonable, and the strength of the whole structure is improved.
Compared with the prior art, the beneficial effects of the utility model are that:
on the premise of ensuring the safe and stable operation of the speed regulator, the structure of the speed regulator is more compact, the main pressure distribution valve and the accident pressure distribution valve can be arranged in the same speed regulating cabinet, and the problem that the accident pressure distribution valve cannot be arranged due to the limitation of a site is solved; the control oil pipe required by the independent installation of the accident pressure distribution valve is avoided, and the work of piping, later maintenance and the like during the installation of the accident pressure distribution valve is greatly reduced; the maintenance and the operation of workers can be more convenient under the conditions of accidents and tests; the action stability of the accident pressure distribution valve and the whole combination is further improved.
The integral structure is not only suitable for the speed regulator of a hydraulic power plant, but also suitable for other speed regulators with main distributing valves.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a structural diagram of a main distributing valve region of the present invention.
Fig. 3 is the structural schematic diagram of the accident pressure distribution valve region of the present invention.
Fig. 4 is a schematic diagram of the oil circuit arrangement structure of the pilot valve of the present invention.
In the figure: 1. the system comprises a main pressure distribution valve, 101, a main oil discharge cavity, 102, a main starting cavity, 103, a main shutdown cavity, 104, an external electromagnetic valve pipe orifice, 2, an accident pressure distribution valve, 201, a safe oil discharge cavity, 202, a safe starting cavity, 203, a pressure oil cavity, 204, a safe shutdown cavity, 205, a small-caliber oil inlet pipe of a guide valve, and 206, a small-caliber oil return pipe of the guide valve.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Referring to fig. 1, the speed regulator with integrated main pressure distribution valve and emergency pressure distribution valve in the speed regulation system of the hydraulic power plant of the present embodiment mainly comprises a main pressure distribution valve 1 with a piston structure and an emergency pressure distribution valve 2 with a piston structure.
The plunger in the main distributing valve 1 and the plunger in the accident distributing valve 2 are arranged in parallel. The main pressure distributing valve 1 includes a main starting cavity 102 and a main stopping cavity 103 located in the middle of the plunger, as shown in fig. 2, the main starting cavity 102 and the main stopping cavity 103 are respectively provided with main oil drainage cavities 101 along the upper and lower ends, and the main oil drainage cavities 101 at the two ends are communicated in the valve body and uniformly connected to a zero pressure region (an oil collecting tank or an oil tank). A safe startup cavity 202, a safe shutdown cavity 204 and a safe oil discharge cavity 201 are arranged in the emergency pressure distribution valve 2, as shown in fig. 3, a pressure oil cavity 203 is arranged between the safe startup cavity 202 and the safe shutdown cavity 204, and the pressure oil cavity 203 is connected with a main oil supply channel.
Further, the internal oil passages of the integrated speed regulator are distributed: the main starting cavity 102 in the main distribution valve 1 is communicated with the safe starting cavity 202 in the accident distribution valve 2, the main closing cavity 103 in the main distribution valve 1 is communicated with the safe closing cavity 204 in the accident distribution valve 2, and the main oil discharge cavity 101 in the main distribution valve 1 is communicated with the safe oil discharge cavity 201 in the accident distribution valve 2.
The upper ends of the main pressure distribution valve 1 and the accident pressure distribution valve 2 are respectively provided with a guide valve, the two guide valves are communicated, and the communicated oil path is as shown in figure 4. The external solenoid valve pipe orifice 104 is used for externally connecting a solenoid valve, and the solenoid valve controls the guide valves at the upper ends of the main pressure distribution valve 1 and the accident pressure distribution valve 2 through small-caliber control oil pipes (a small-caliber oil inlet pipe 205 of the guide valve and a small-caliber oil return pipe 206 of the guide valve).
Integral type governor valve body embodiment one: the main pressure distribution valve 1 and the accident pressure distribution valve 2 are of an integrated structure, an internal oil duct, a seal and the like are processed in the same body, and the overall structural strength is high.
Integral type governor valve body embodiment two: namely, the main pressure distribution valve 1 and the accident pressure distribution valve 2 are a combination of two single valve bodies which are matched with each other, and the mode is slightly simple for processing the internal control oil passage.
When the speed regulator operates normally, the main pressure distribution valve 1 and the accident pressure distribution valve 2 are communicated with each other through pressure oil, and the pressure oil cavity is in a closed state. The main distributing valve 1 is controlled by the control system to move in the direction of starting or stopping.
a. When the unit is started, the pressure oil cavity of the main pressure distribution valve 1 is communicated with the main starting cavity 102, the emergency pressure distribution valve 2 does not act, the safe starting cavity 202 of the emergency pressure distribution valve 2 is communicated with the main starting cavity 102 of the main pressure distribution valve 1, and pressure oil reaches the servomotor to control the movable guide vane to act towards the starting direction. Meanwhile, the servomotor return oil flows to the main closing cavity 103 of the main pressure distribution valve 1 to the main oil discharge cavity 101 of the main pressure distribution valve 1 through the safety closing cavity 204 of the accident pressure distribution valve 2, and the servomotor return oil is discharged to an oil collecting tank.
b. When the unit is shut down, the pressure oil cavity of the main distributing valve 1 is communicated with the main shut-down cavity 103, and pressure oil flows to the servomotor through the safety shut-down cavity 204 of the accident distributing valve 2 to control the movable guide vane to move towards the shut-down direction. Meanwhile, the servomotor return oil flows to the main starting cavity 102 of the main distribution valve 1 to the main oil discharge cavity 101 of the main distribution valve 1 through the safe starting cavity 202 of the accident distribution valve 2, and the servomotor return oil is discharged to an oil collecting tank.
When the mechanical overspeed device acts, the emergency stop action contact of the emergency distributing valve 2 acts to cut off the safety starting cavity 202 and the safety stopping cavity 204 of the emergency distributing valve 2 from the main starting cavity 102 and the main stopping cavity 103 of the main distributing valve 1, and meanwhile, the pressure oil of the emergency distributing valve 2 is communicated with the safety stopping cavity 204 of the emergency distributing valve 2 until the servomotor controls the movable guide vane to act in the stopping direction. The safe starting cavity 202 of the accident pressure distribution valve 2 is communicated with the oil discharge cavity, and the servomotor return oil flows to the main oil discharge cavity 101 of the main pressure distribution valve 1 through the safe oil discharge cavity 201 of the accident pressure distribution valve 2 and is discharged to the oil collecting tank.
The above embodiments are descriptions of the present invention, not limitations of the present invention, and any structure after simple transformation is all included in the protection scope of the present invention.
Claims (7)
1. A main pressure distribution valve and accident pressure distribution valve integrated speed regulator in a hydraulic power plant speed regulating system is characterized by comprising a main pressure distribution valve (1) with a piston type structure and an accident pressure distribution valve (2) with a piston type structure, wherein a plunger in the main pressure distribution valve and a plunger in the accident pressure distribution valve are arranged in parallel; the main pressure distributing valve comprises a main starting cavity (102) and a main closing cavity (103) which are positioned in the middle of the plunger, and two ends of the main starting cavity and the main closing cavity are respectively provided with a main oil drainage cavity (101); a safe startup cavity (202), a safe shutdown cavity (204) and a safe oil discharge cavity (201) are arranged in the emergency pressure distribution valve, and a pressure oil cavity (203) is arranged between the safe startup cavity and the safe shutdown cavity;
and a main starting cavity, a main closing cavity and a main oil discharge cavity in the main pressure distribution valve are respectively communicated with a safety starting cavity, a safety closing cavity and a safety oil discharge cavity in the accident pressure distribution valve.
2. The speed regulator of claim 1, wherein one end of the main distributing valve (1) and one end of the emergency distributing valve (2) are provided with a guide valve, and the two guide valves are communicated.
3. The speed regulator of claim 2, wherein one end of the main distributing valve (1) and one end of the emergency distributing valve (2) are provided with a small-diameter control oil pipe, and the external electromagnetic valve controls the pilot valve at one end of the main distributing valve and one end of the emergency distributing valve through the small-diameter control oil pipe.
4. The integrated speed regulator of the main distributing valve and the accident distributing valve in the speed regulating system of the hydraulic power plant according to claim 3, wherein the diameter of the small-caliber control oil pipe is less than or equal to one third of the diameter of the main oil gallery.
5. The integrated speed regulator of the main pressure distributing valve and the accident pressure distributing valve in the speed regulating system of the hydraulic power plant according to claim 1, characterized in that main oil discharge cavities (101) respectively arranged at two ends of a main starting cavity (102) and a main closing cavity (103) in the main pressure distributing valve (1) are communicated in a valve body and uniformly flow back to a zero-pressure area.
6. The integrated speed regulator of the main distributing valve and the accident distributing valve in the speed regulating system of the hydraulic power plant according to claim 1, wherein the main distributing valve (1) and the accident distributing valve (2) are of an integrated structure.
7. The integrated speed regulator of the main distributing valve and the accident distributing valve in the speed regulating system of the hydraulic power plant according to claim 1, wherein the main distributing valve (1) and the accident distributing valve (2) are a combination of two single valve bodies which are matched with each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020643690.3U CN212027975U (en) | 2020-04-24 | 2020-04-24 | Main distributing valve and accident distributing valve integral type speed regulator among hydraulic power plant's speed governing system |
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| CN202020643690.3U CN212027975U (en) | 2020-04-24 | 2020-04-24 | Main distributing valve and accident distributing valve integral type speed regulator among hydraulic power plant's speed governing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396242A (en) * | 2020-04-24 | 2020-07-10 | 国家电网有限公司 | Main distributing valve and accident distributing valve integrated speed regulator in hydraulic power plant speed regulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396242A (en) * | 2020-04-24 | 2020-07-10 | 国家电网有限公司 | Main distributing valve and accident distributing valve integrated speed regulator in hydraulic power plant speed regulating system |
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