Hydraulic system of water-turbine generator set and water-turbine generator set

Abstract

The invention relates to a hydraulic system of a water-turbine generator set and the water-turbine generator set, and the hydraulic system comprises a hydraulic control valve which is provided with a first opening, a second opening and a third opening; a governor hydraulic system; the cylinder valve hydraulic system is provided with an emergency distributing valve and comprises a first liquid inlet end and a second liquid inlet end; one end of the first pipeline communicates with the second liquid inlet end, and the other end communicates with the first opening; one end of the second pipeline communicates with the second opening, and the other end communicates with the first liquid inlet end; one end of the third pipeline is communicated with the third opening, the other end of the third pipeline is used for being communicated to the pressure relief part, and the hydraulic control valve is configured in the mode that in the pressure relief state, the first opening and the third opening are communicated; and in a normal pressure state, the first opening is communicated with the second opening. By improving a hydraulic system of an original water-turbine generator set, the problem of oil pumping is effectively solved, the original functions of the system are not damaged, and the cylindrical valve can still start a flowing water closing process when the water-turbine generator set has an abnormal fault (such as overspeed rotating speed of a water wheel).

Description

Technical Field

[0001] The present disclosure relates to the technical field of water turbine generator sets, and in particular to a hydraulic system of a water turbine generator set and a water turbine generator set. Background Art

[0002] A hydroelectric generator set refers to a unit that uses flowing water to drive a water wheel to rotate and generate electricity. It includes a governor system and a cylinder valve system. The governor system adjusts the flow rate and flow rate of the water flow by controlling the opening of the guide vane of the turbine, thereby adjusting the rotation speed of the water wheel; the cylinder valve system is installed upstream of the guide vane and is also used to cut off the water flow. The cylinder valve system includes an emergency pressure regulating valve, and the governor system includes an overspeed device switching valve.

[0003] In the related technology, in order to meet the requirements of the industry, the cylinder valve system needs to be able to start the dynamic water closing process after the mechanical overspeed protection device is activated in the event of a runaway accident. For this function, the governor system needs to be connected to the accident pressure regulating valve through the overspeed device switching valve pipeline. When the turbine speed is abnormal, the overspeed device switching valve can relieve the pressure of the governor system, thereby destroying the pressure balance of the left and right liquid inlet ends of the accident pressure regulating valve, so that the valve core of the accident pressure regulating valve moves and the main body of the cylinder valve moves to realize the dynamic water closing process. However, such a design, because the governor system is connected to the cylinder valve system, and there is a matching gap between the pipeline connecting the two and the valve core of the accident pressure regulating valve, there is leakage, causing the oil in the governor system to continue to leak toward the cylinder valve system, the oil level of the governor system return tank gradually decreases, and the oil level of the cylinder valve system return tank gradually increases, which increases the workload of the maintenance personnel who need to regularly balance the oil volume of the two. Summary of the invention

[0004] The purpose of the present disclosure is to provide a hydraulic system of a water turbine generator set and a water turbine generator set, so as to at least partially solve the problems existing in the related art.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a hydraulic system of a hydro-turbine generator set, comprising: a hydraulically controlled valve having a first opening, a second opening and a third opening; a speed governor hydraulic system having a normal pressure state and a pressure relief state, the speed governor hydraulic system being cut off from the first opening, the second opening and the third opening respectively; a cylinder valve hydraulic system having an emergency pressure regulating valve, the emergency pressure regulating valve comprising a first liquid inlet end and a second liquid inlet end; a first pipeline, one end of which is connected to the second liquid inlet end and the other end is connected to the first opening; a second pipeline, one end of which is connected to the second opening and the other end is connected to the first liquid inlet end; and a third pipeline, one end of which is connected to the third opening and the other end is used to be connected to a pressure relief part, wherein the hydraulically controlled valve is configured as follows: when the speed governor hydraulic system is in the pressure relief state, the first opening and the third opening are internally connected; when the speed governor hydraulic system is in the normal pressure state, the first opening and the second opening are internally connected.

[0006] Optionally, the hydraulic control valve also has a fourth opening, and the hydraulic system of the hydro-turbine generator set also includes a fourth pipeline with one end connected to the governor hydraulic system and the other end connected to the fourth opening. The hydraulic control valve can obtain the governor hydraulic system in the pressure relief state or the normal pressure state through the fourth pipeline.

[0007] Optionally, the hydraulic control valve includes a valve housing, a valve core and a coil spring, wherein, when the speed regulator hydraulic system is in the normal pressure state, the hydraulic pressure of the fourth opening pushes the valve core to compress the coil spring until the first opening and the second opening are internally connected; when the speed regulator hydraulic system is in the pressure relief state, the coil spring elastically resets to push the valve core to move to the first opening and the third opening to be internally connected.

[0008] Optionally, the fourth opening is cut off from the first opening, the second opening and the third opening respectively.

[0009] Optionally, the hydro-generator set includes a turbine, and the governor hydraulic system includes an overspeed shut-off valve, the overspeed shut-off valve has a first flow channel and a second flow channel, the overspeed shut-off valve is installed on the turbine to selectively open the first flow channel or the second flow channel by utilizing the change in the speed of the turbine, and the hydraulic system of the hydro-generator set also includes a first pressure oil tank and a first return oil tank, wherein the overspeed shut-off valve is configured as follows: when the speed of the turbine is less than a preset threshold, the first flow channel is opened and the second flow channel is cut off, and the first pressure oil tank supplies pressure to the governor hydraulic system through the first flow channel to put the governor hydraulic system in the normal pressure state; when the speed of the turbine is greater than or equal to the preset threshold, the first flow channel is cut off and the second flow channel is opened, and the governor hydraulic system releases pressure toward the first return oil tank through the second flow channel to put the governor hydraulic system in the pressure relief state.

[0010] Optionally, the cylinder valve hydraulic system further comprises a functional pipeline group, the first liquid inlet end is connected to the functional pipeline, and an end of the second pipeline away from the hydraulic control valve is connected to the functional pipeline group.

[0011] Optionally, it further includes a second pressure oil tank and a second return oil tank, and the second pressure oil tank and the second return oil tank are respectively connected to the cylinder valve hydraulic system.

[0012] Optionally, the cylinder valve hydraulic system further comprises a synchronous flow divider, and the synchronous flow divider serves as the pressure relief portion.

[0013] Optionally, the average pressure of the governor hydraulic system is greater than the average pressure of the cylinder valve hydraulic system.

[0014] According to a second aspect of the present disclosure, a water turbine generator set is provided, comprising a water wheel, a speed governor, a cylinder valve and a hydraulic system of the water turbine generator set.

[0015] Through the above technical solution, the first opening, the second opening and the third opening of the hydraulic system of the speed regulator and the hydraulic control valve are cut off respectively, which can effectively prevent the hydraulic oil in the hydraulic system of the speed regulator from leaking to the cylinder valve hydraulic system, fundamentally solve the oil leakage problem, and reduce the maintenance workload of personnel. In addition, by redesigning the hydraulic control valve, it can be achieved that when the hydraulic system of the speed regulator is in a normal pressure state, the first liquid inlet end and the second liquid inlet end of the emergency pressure regulating valve are connected through the first pipeline and the second pipeline, so as to keep the pressure of the two liquid inlets balanced and stable; when the hydraulic system of the speed regulator has a mechanical failure and is in a pressure relief state, the hydraulic control valve can be adjusted to be connected to the first opening and the third opening, that is, the hydraulic oil in the second liquid inlet end and the first pipeline can be relieved to the pressure relief part through the third pipeline, thereby destroying the pressure balance between the first liquid inlet end and the second liquid inlet end, so that the emergency pressure regulating valve can switch the state to control the cylinder valve movement to cut off the water flow, that is, start the dynamic water closing process. This solution effectively solves the oil leakage problem between the governor hydraulic system and the cylinder valve hydraulic system by improving the hydraulic system of the original turbine generator set. The improvement does not destroy the original function of the system, and still satisfies the requirement that the cylinder valve can start the dynamic water shutoff process when an abnormal fault occurs in the turbine generator set (such as excessive turbine speed). In addition, the newly added first pipeline can continue to use the original connecting pipeline before the hydraulic system improvement, and only the second pipeline, the third pipeline and the hydraulic control valve need to be added. The changes to the original system are relatively small, and fewer new equipment and pipelines are added, which reduces the improvement cost and the potential faults caused by the improvement.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a hydraulic system of a hydro-generator set exemplarily shown in the present disclosure; Figure 2 yes Figure 1 A partial enlarged view of a portion of the hydraulic system of a hydro-generator set close to a governor hydraulic system shown in FIG. Figure 3 yes Figure 1 A partial enlarged view of a portion of the hydraulic system of a hydro-generator set close to a hydraulic control valve shown in FIG. Figure 4 yes Figure 1 A partial enlarged view of a portion of the hydraulic system of a hydro-generator set close to an emergency pressure regulating valve shown in FIG. Figure 5 yes Figure 1FIG. 4 is a partial enlarged view of the hydraulic system of the hydro-generator set close to the cylinder valve hydraulic system.

[0018] Description of Reference Numerals 100-hydraulic control valve; 101-first opening; 102-second opening; 103-third opening; 104-fourth opening; 105-helical spring; 200-speed governor hydraulic system; 201-overspeed shut-off valve; 202-first flow channel; 203-second flow channel; 300-cylinder valve hydraulic system; 301-accident pressure regulating valve; 302-first liquid inlet end; 303-second liquid inlet end; 304-functional pipeline group; 305-synchronous diverter; 401-first pipeline; 402-second pipeline; 403-third pipeline; 404-fourth pipeline; 501-first pressure oil tank; 502-first return oil tank; 503-second pressure oil tank; 504-second return oil tank; 601-turbine. DETAILED DESCRIPTION

[0019] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0020] In the present disclosure, unless otherwise stated, the directional terms "inside" and "outside" used are based on the contours of the relevant components themselves. For example, the "interior" connection between the first opening and the third opening means that the first opening and the third opening are internally connected to each other in the hydraulic control valve.

[0021] In addition, in the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and have no order or importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0022] In order to facilitate the understanding of this solution, the improvement background of this solution is first introduced in detail. Specifically, as introduced in the background technology part, at present, there is leakage in the factory because the governor system is connected to the cylinder valve system, and there is a matching gap between the pipeline connecting the two and the valve core of the emergency pressure regulating valve. In particular, some wind turbine power plants are put into the AGC (automatic generation control) of the power grid. The governor hydraulic system frequently operates with the AGC, resulting in the overall pressure of the governor hydraulic system being higher than the oil pressure of the cylinder valve hydraulic system for a long time, thereby accelerating the internal leakage, that is, causing the oil in the governor system to continue to leak toward the cylinder valve system, the oil level of the governor system return tank gradually decreases, and the oil level of the cylinder valve system return tank gradually increases, increasing the workload of maintenance personnel who need to regularly balance the oil volume of the two. In response to this technical problem, there are currently two common practices in the industry. One is to add a set of oil discharge equipment between the governor hydraulic system and the cylinder valve hydraulic system to regularly pump the oil of the cylinder valve hydraulic system back to the governor hydraulic system. However, this approach only treats the symptoms but not the root cause, and does not fundamentally solve the problem. Another approach in the industry is to directly isolate the governor hydraulic system from the cylinder valve hydraulic system, that is, to directly cut off the original pipeline connecting the two. Although this approach solves the oil leakage problem between the two to a certain extent, this approach makes the original system lose the function of the cylinder valve hydraulic system starting the dynamic water shutoff process according to the action of the overspeed protection device (i.e., the overspeed shutoff valve below) when the unit runs away.

[0023] Based on the above improvement background, the improvement disclosed in this disclosure needs to meet the following requirements in addition to solving the oil leakage problem: 1. It cannot be a temporary solution, but needs to fundamentally solve the oil leakage problem; 2. It needs to retain the function of the cylinder valve hydraulic system to start the dynamic water shut-off process according to the action of the overspeed protection device; 3. The changes to the original system should not be too many, and the addition of equipment and the modification of pipelines should be as little as possible. Specifically: Reference Figure 1-Figure 5The present disclosure exemplarily shows a hydraulic system of a hydro-turbine generator set, including a hydraulic control valve 100 having a first opening 101, a second opening 102 and a third opening 103, a governor hydraulic system 200 having a normal pressure state and a pressure relief state, a cylinder valve hydraulic system 300 having an emergency pressure regulating valve 301, a first pipeline 401, a second pipeline 402 and a third pipeline 403. The governor hydraulic system 200 refers to a hydraulic system of a governor for controlling the speed of a water turbine of a hydro-turbine set, the cylinder valve hydraulic system 300 refers to a hydraulic system of a cylinder valve for cutting off water flow, and the emergency pressure regulating valve 301 refers to a functional valve for controlling the main body of the cylinder valve to descend to cut off water flow when the speed of the water turbine is abnormal. Since the principles and structures of the governor hydraulic system 200, the cylinder valve hydraulic system 300 and the emergency pressure regulating valve 301 are well known to those skilled in the art, they are not introduced in detail here. The governor hydraulic system 200 is cut off from the first opening 101, the second opening 102 and the third opening 103 respectively, which can be realized by separating the governor hydraulic system 200 from the hydraulic control valve 100 (no connection relationship), or, when the governor hydraulic system 200 is connected to the hydraulic control valve 100 through the fourth pipeline and the fourth opening mentioned below, it can be realized by designing the internal structure of the hydraulic control valve 100. The emergency pressure regulating valve 301 includes a first liquid inlet end 302 and a second liquid inlet end 303. One end of the first pipeline 401 is connected to the second liquid inlet end 303, and the other end is connected to the first opening 101. One end of the second pipeline 402 is connected to the second opening 102, and the other end is connected to the first liquid inlet end 302. One end of the third pipeline 403 is connected to the third opening 103, and the other end is used to connect to the pressure relief part. The pressure relief part can be an oil tank, an oil pool, a pressure-free pipeline, a synchronous diverter mentioned below, etc., as long as it can be used to discharge and relieve the pressure of the pressure oil in the first pipeline 401. The hydraulic control valve 100 is configured such that when the speed regulator hydraulic system 200 is in a pressure relief state, the first opening 101 and the third opening 103 are internally connected; when the speed regulator hydraulic system 200 is in a normal pressure state, the first opening 101 and the second opening 102 are internally connected.

[0024] It should be noted that the present disclosure does not limit the internal structure of the hydraulic control valve 100, which may include a valve housing and a valve core, the valve housing is provided with the aforementioned multiple openings, the valve core is provided with multiple channels, and different openings can be selected to be connected by controlling the relative position of the valve core and the valve housing. Since the structure of the hydraulic control valve 100 and the principle of cutting off and conducting different liquid flow channels are well known to those skilled in the art, they will not be introduced in detail here, and the improvement of the present disclosure is not in its internal structure, as long as it can achieve the aforementioned functions.

[0025] In the embodiment of the present disclosure, the aforementioned first pipeline 401 can extend the original connecting pipeline between the hydraulic system of the turbine generator set and the governor hydraulic system 200 and the cylinder valve hydraulic system 300. Specifically, when improving the hydraulic system of the original turbine generator set, the original connecting pipeline can be cut off from any position to obtain two parts, wherein the part connected to the emergency pressure regulating valve 301 can be directly used as the first pipeline 401, and the hydraulic control valve 100 can be connected to the end of the first pipeline 401, and the part connected to the governor hydraulic system 200 can be used for the fourth pipeline mentioned below, or it can also be directly cut off.

[0026] The present disclosure does not limit how the hydraulic control valve 100 obtains the working state of the governor hydraulic system 200. For example, it can be connected by signal, that is, a pressure detection device can be provided in the governor hydraulic system 200, which can be connected to the hydraulic control valve 100 by signal, so as to control the hydraulic control valve 100 according to the detection value of the pressure detection device. In addition, in some other embodiments, pure mechanical coordination can be achieved through the fourth pipeline and the fourth opening mentioned below. This design method does not require electrical components, has high reliability and low failure rate, and can still achieve the switching of the working state of the hydraulic control valve 100 in the case of power failure, etc. This point will be described in detail below.

[0027] By using the above technical solution, the first opening 101, the second opening 102 and the third opening 103 of the speed regulator hydraulic system 200 and the hydraulic control valve 100 are cut off respectively, which can effectively prevent the hydraulic oil in the speed regulator hydraulic system 200 from leaking to the cylinder valve hydraulic system 300, fundamentally solve the oil leakage problem, and reduce the maintenance workload of personnel. In addition, by redesigning the hydraulic control valve 100, it can be achieved that when the hydraulic system 200 of the speed regulator is in a normal pressure state, the first liquid inlet end 302 and the second liquid inlet end 303 of the emergency pressure regulating valve 301 are connected through the first pipeline 401 and the second pipeline 402, thereby keeping the pressure of the two liquid inlet ends balanced and stable; when the hydraulic system 200 of the speed regulator has a mechanical failure and is in a pressure relief state, the hydraulic control valve 100 can be adjusted to make the first opening 101 and the third opening 103 conductive, that is, the hydraulic oil in the second liquid inlet end 303 and the first pipeline 401 can be relieved to the pressure relief part through the third pipeline 403, thereby destroying the pressure balance between the first liquid inlet end 302 and the second liquid inlet end 303, so that the emergency pressure regulating valve 301 can switch the state to control the movement of the cylinder valve to cut off the water flow, that is, start the dynamic water closing process. This solution effectively solves the oil leakage problem between the governor hydraulic system 200 and the cylinder valve hydraulic system 300 by improving the hydraulic system of the original turbine generator set, and the improvement does not destroy the original function of the system, and still satisfies the requirement that the cylinder valve can start the dynamic water shut-off process when an abnormal fault occurs in the turbine generator set (such as excessive turbine speed). In addition, the newly added first pipeline 401 can continue to use the original connecting pipeline before the hydraulic system is improved, and only the second pipeline 402, the third pipeline 403 and the hydraulic control valve 100 need to be added. The changes to the original system are relatively small, and the newly added equipment and pipelines are relatively few, which reduces the improvement cost and the potential faults caused by the improvement.

[0028] Reference Figure 1-Figure 3 In some preferred embodiments, the hydraulic control valve 100 may also have a fourth opening 104, and the hydraulic system of the hydro-generator set may also include a fourth pipeline 404 having one end connected to the governor hydraulic system 200 and the other end connected to the fourth opening 104. The fourth pipeline 404 may continue to use another part of the original connecting pipeline of the original hydraulic system, that is, the original connecting pipeline is divided into two parts, one part is used as the first pipeline 401, and the other part is used as the fourth pipeline 404, so that the original connecting pipeline can be effectively used, the system modification is reduced, and the cost and system complexity are reduced. The hydraulic control valve 100 can obtain the governor hydraulic system 200 in the pressure relief state or the normal pressure state through the fourth pipeline 404, so that the working state of the hydraulic control valve 100 can be adjusted in time, and then the working state of the accident pressure distribution valve 301 can be changed. In this design, the relationship is established through the pipeline hydraulic pressure, and no electrical components and signal connections are involved. Its stability is more reliable, the failure rate is lower, and the working state can still be switched in the case of power failure.

[0029] Further, in the embodiment of the present disclosure, the fourth opening 104 can be cut off from the first opening 101, the second opening 102 and the third opening 103 respectively. Thus, the pressure oil of the governor hydraulic system 200 can be prevented from leaking to the cylinder valve hydraulic system 300 through the fourth opening 104. It should be noted that the “cut-off” can be achieved by designing the specific structure of the valve core or valve housing of the hydraulic control valve 100.

[0030] In order to enable the hydraulic control valve 100 to switch its working state according to the hydraulic state of the fourth pipeline 404 (i.e., the hydraulic state of the governor hydraulic system 200), refer to Figure 3 In the embodiment of the present disclosure, the hydraulic control valve 100 may include a valve housing, a valve core and a coil spring 105. Among them, when the speed regulator hydraulic system 200 is in the normal pressure state, the hydraulic pressure of the fourth opening 104 can push the valve core to compress the coil spring 105 to the first opening 101 and the second opening 102 to be internally connected. When the speed regulator hydraulic system 200 is in a pressure relief state, the coil spring 105 can be elastically reset to push the valve core to move to the first opening 101 and the third opening 103 to be internally connected. The specific principle of balancing the pressure by the coil spring 105 to switch the hydraulic control valve 100 is well known to those skilled in the art and will not be described in detail here. With such a design, the original "cylinder valve start-up water shut-off" function of the system can be fully retained, and its startup is also made according to the pressure relief action of the speed regulator hydraulic system 200. The entire signal transmission process retains the original hydraulic pipeline transmission, and there is no need to add electrical components, etc., with high stability and more reliability.

[0031] Reference Figure 1 and Figure 2In an embodiment of the present disclosure, a hydro-generator set may include a turbine 601 (part of the figure shows the rotating shaft of the turbine 601, and the runner part is omitted), and a governor hydraulic system 200 may include an overspeed shutoff valve 201, i.e., a mechanical overspeed protection device. The overspeed shutoff valve 201 may have a first flow channel 202 and a second flow channel 203, and the overspeed shutoff valve 201 may be installed on the turbine 601 to selectively conduct the first flow channel 202 or the second flow channel 203 by utilizing the speed change of the turbine 601, and the hydraulic system of the hydro-generator set may also include a first pressure oil tank 501 and a first return oil tank 502. Among them, the overspeed shut-off valve 201 can be configured as follows: when the speed of the turbine 601 is less than a preset threshold value (which can be adaptively designed according to actual conditions), the first flow channel 202 is turned on and the second flow channel 203 is turned off, and the first pressure oil tank 501 can supply pressure to the governor hydraulic system 200 through the first flow channel 202 to put the governor hydraulic system 200 in a normal pressure state. When the speed of the turbine 601 is greater than or equal to the preset threshold value, the first flow channel 202 is turned off and the second flow channel 203 is turned on, and the governor hydraulic system 200 can release pressure toward the first return oil tank 502 through the second flow channel 203 to put the governor hydraulic system 200 in a pressure relief state. By setting the overspeed shut-off valve 201, the speed of the turbine 601 can be monitored, so that the pressure can be released and adjusted in time when an abnormal speed occurs. It should be noted that in the embodiment of the present disclosure, the overspeed shut-off valve 201 can make the valve core in different positions through different centrifugal forces at different speeds of the turbine 601, thereby realizing the switching of the working state.

[0032] Reference Figure 1 and Figure 4 In the embodiment of the present disclosure, the cylinder valve hydraulic system 300 may further include a functional pipeline group 304, the first liquid inlet end 302 may be connected to the functional pipeline 304, and the end of the second pipeline 402 away from the hydraulic control valve 100 may be connected to the functional pipeline group 304. Here, the functional pipeline 304 refers to each pipeline in the cylinder valve hydraulic system 300, and its internal pressure is the pressure of the cylinder valve hydraulic system 300. The first liquid inlet end 302 is connected to it, and the second liquid inlet end 303 is connected to the functional pipeline 304 through the first pipeline 401 and the second pipeline 402, so that the hydraulic pressure of the first liquid inlet end 302 and the second liquid inlet end 303 are equal, so that the emergency pressure regulating valve 301 is maintained in a corresponding working state. In addition, in some other embodiments, the second pipeline 402 may also be directly connected to the second liquid inlet end 303, and the present disclosure does not limit this.

[0033] Reference Figure 1In order to maintain the cylinder valve hydraulic system 300 at the required pressure and to relieve or circulate the internal pressure, in the embodiment of the present disclosure, the hydraulic system of the hydro-turbine generator set may also include a second pressure oil tank 503 and a second return oil tank 504, and the second pressure oil tank 503 and the second return oil tank 504 may be respectively connected to the cylinder valve hydraulic system 300.

[0034] Reference Figure 1 and Figure 5 In the embodiment of the present disclosure, the cylinder valve hydraulic system 300 may further include a synchronous flow divider 305, which may be used as a pressure relief unit. Here, the synchronous flow divider 305 is used to adjust the consistency of the actions of the cylinder valves. It is close to the hydraulic control valve 100, and the required pipeline is short. When it is used as a pressure relief unit, no additional pressure relief structure is required, which reduces the modification of the original system. And the pressure oil in the cylinder valve hydraulic system 300 can be reused.

[0035] In the embodiment of the present disclosure, the average pressure of the speed governor hydraulic system 200 is greater than the average pressure of the cylinder valve hydraulic system 300. In this case, the leakage of the speed governor hydraulic system 200 toward the cylinder valve hydraulic system 300 is more serious, so the improvement scheme of the present disclosure can effectively solve the aforementioned oil leakage problem. It should be explained that the "average pressure" here refers to the average value of the pressure of the hydraulic system over a period of time.

[0036] According to the second aspect of the present disclosure, a hydro-turbine generator set is provided, comprising a turbine 601, a speed governor, a cylinder valve and the hydraulic system of the above-mentioned hydro-turbine generator set. Since the hydro-turbine generator set has all the beneficial effects of the hydraulic system of the above-mentioned hydro-turbine generator set, they are not described in detail here.

[0037] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0038] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0039] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A hydraulic system for a hydro-generator set, It is characterized in that include: A hydraulically controlled valve having a first opening, a second opening, and a third opening; A speed regulator hydraulic system having a normal pressure state and a pressure relief state, wherein the speed regulator hydraulic system is cut off from the first opening, the second opening, and the third opening respectively; A cylinder valve hydraulic system, comprising an emergency pressure regulating valve, wherein the emergency pressure regulating valve comprises a first liquid inlet end and a second liquid inlet end; a first pipeline, one end of which is connected to the second liquid inlet end, and the other end of which is connected to the first opening; a second pipeline, one end of which is connected to the second opening, and the other end of which is connected to the first liquid inlet end; as well as A third pipeline, one end of which is connected to the third opening, and the other end of which is connected to the pressure relief part. Wherein, the hydraulic control valve is configured as follows: when the speed regulator hydraulic system is in the pressure relief state, the first opening and the third opening are internally connected; when the speed regulator hydraulic system is in the normal pressure state, the first opening and the second opening are internally connected.

2. The hydraulic system of the hydro-generator set according to claim 1, It is characterized in that The hydraulic control valve also has a fourth opening, and the hydraulic system of the hydro-turbine generator set also includes a fourth pipeline with one end connected to the governor hydraulic system and the other end connected to the fourth opening. The hydraulic control valve can obtain the governor hydraulic system in the pressure relief state or the normal pressure state through the fourth pipeline.

3. The hydraulic system of the hydro-generator set according to claim 2, It is characterized in that The hydraulic control valve comprises a valve housing, a valve core and a coil spring. Wherein, when the speed regulator hydraulic system is in the normal pressure state, the hydraulic pressure of the fourth opening pushes the valve core to compress the coil spring until the first opening and the second opening are internally connected; when the speed regulator hydraulic system is in the pressure relief state, the coil spring elastically resets to push the valve core to move to the first opening and the third opening to be internally connected.

4. The hydraulic system of the hydro-generator set according to claim 2, It is characterized in that The fourth opening is closed to the first opening, the second opening and the third opening respectively.

5. The hydraulic system of the hydro-generator set according to claim 2 or 3, It is characterized in that The hydro-generator set includes a water turbine, the governor hydraulic system includes an overspeed shutoff valve, the overspeed shutoff valve has a first flow channel and a second flow channel, the overspeed shutoff valve is installed on the water turbine to selectively conduct the first flow channel or the second flow channel by utilizing the speed change of the water turbine, and the hydraulic system of the hydro-generator set also includes a first pressure oil tank and a first return oil tank, Wherein, the overspeed shut-off valve is configured as follows: when the speed of the turbine is less than a preset threshold value, the first flow channel is connected and the second flow channel is blocked, and the first pressure oil tank supplies pressure to the governor hydraulic system through the first flow channel so that the governor hydraulic system is in the normal pressure state; when the speed of the turbine is greater than or equal to the preset threshold value, the first flow channel is blocked and the second flow channel is connected, and the governor hydraulic system releases pressure toward the first return oil tank through the second flow channel so that the governor hydraulic system is in a pressure relief state.

6. The hydraulic system of the hydro-generator set according to claim 1, It is characterized in that The cylinder valve hydraulic system further comprises a functional pipeline group, the first liquid inlet end is connected to the functional pipeline, and an end of the second pipeline away from the hydraulic control valve is connected to the functional pipeline group.

7. The hydraulic system of the hydro-generator set according to claim 1, It is characterized in that It also includes a second pressure oil tank and a second return oil tank, wherein the second pressure oil tank and the second return oil tank are respectively connected to the cylinder valve hydraulic system.

8. The hydraulic system of the hydro-generator set according to claim 1, It is characterized in that The cylinder valve hydraulic system further includes a synchronous flow divider serving as the pressure relief portion.

9. The hydraulic system of the hydro-generator set according to claim 1, It is characterized in that The average pressure of the governor hydraulic system is greater than the average pressure of the cylinder valve hydraulic system.

10. A hydroelectric generator set, It is characterized in that A hydraulic system comprising a water turbine, a speed governor, a cylinder valve and a water turbine generator set according to any one of claims 1 to 9.

Images