An overhaul support system for an air cushion type surge chamber

Abstract

The application relates to a kind of overhauling guarantee systems of air cushion type surge chamber, including a diversion tunnel, multiple connection tunnels and multiple air cushion type surge chambers, multiple connection tunnels are arranged along the length direction of diversion tunnel, each connection tunnel is provided with a pressure pipeline extending along the length direction, the two ends of each pressure pipeline are communicated with diversion tunnel and an air cushion type surge chamber respectively, the middle part of pressure pipeline is provided with an overhauling valve, the two ends of overhauling valve are installed with flange pipe joints, the ends of multiple air cushion type surge chambers away from diversion tunnel are communicated with each other through air pipe, and air pipe is provided with air valve between adjacent two air cushion type surge chambers in sequence, the two ends of each air valve are installed with flange pipe joints. The overhauling guarantee system is provided with multiple air cushion type surge chambers, so that during the overhauling period of part of air cushion type surge chambers, the remaining air cushion type surge chambers can continue to work to guarantee part of units to continue generating electricity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air cushion type surge chamber, and particularly relates to a maintenance guarantee system of air cushion type surge chamber. BACKGROUND

[0002] The surge chamber is a device for suppressing water hammer and surge, and in water conservancy and hydropower engineering, the role is to reduce the water hammer pressure of the pressure tunnel, improve the operation stability of the unit and the power supply quality. The upper part of the conventional surge chamber is connected with the atmosphere, and the water surface pressure in the surge chamber is also the same as the atmospheric pressure, which leads to a large fluctuation range of the water surface in the surge chamber when the power station adjusts the load. In order to adapt to the large fluctuation range of the water surface, the volume of the surge chamber is also large. In the case that the quality of surrounding rock mass is good, the burial depth and the minimum ground stress meet the conditions, the air cushion type surge chamber can also be used. The upper part of the air cushion type surge chamber is in a closed state and filled with compressed air to form an "air cushion". The "air cushion" can suppress the water level and the fluctuation range of the water level in the air cushion type surge chamber, so that the fluctuation range of the water surface in the air cushion type surge chamber is small. Therefore, the volume of the air cushion type surge chamber is also smaller than that of the conventional surge chamber.

[0003] Patent CN116815719A discloses a regulating system of air cushion type surge chamber, which comprises a connecting tunnel, a water diversion tunnel and an air cushion type surge chamber. A plurality of connecting tunnels are arranged along the length direction of the water diversion tunnel at intervals. A pressure pipeline extending along the length direction is arranged in each connecting tunnel. A valve and a flange pipe joint are arranged in the middle part of the pressure pipeline in sequence. The two ends of the pressure pipeline are respectively connected with the water diversion tunnel and the air cushion type surge chamber. When the air cushion type surge chamber needs to be maintained, the valve on the pressure pipeline is closed to block the flow of water in the water diversion tunnel to the air cushion type surge chamber. Then the water body and the gas in the air cushion type surge chamber are emptied. After the flange pipe joint is disassembled, the maintenance of the air cushion type surge chamber is carried out through the exposed pressure pipeline opening. The water diversion tunnel does not need to be emptied, so that the maintenance time is greatly saved, and the power generation benefit of the power station is improved.

[0004] However, since the water diversion tunnel needs to be connected with all the hydroelectric generating units of the power station to realize load adjustment, and the air cushion type surge chamber in patent CN116815719A is shared by all the hydroelectric generating units, it is impossible for all the hydroelectric generating units to generate electricity normally during the maintenance of the air cushion type surge chamber, which greatly affects the power generation benefit of the power station. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a maintenance guarantee system of air cushion type surge chamber, which can guarantee part of the units to continue generating electricity during the maintenance of the air cushion type surge chamber.

[0006] The present application adopts the following technical scheme:

[0007] The application provides a maintenance guarantee system for air cushion type surge chambers, which comprises a diversion tunnel, multiple connection tunnels and multiple air cushion type surge chambers.

[0008] Preferably, the middle part of the connection tunnel is provided with a maintenance valve chamber, the maintenance valve on the pressure pipeline and the flange pipe joints at both ends of the maintenance valve are located in the maintenance valve chamber, and the pipe section of the pressure pipeline in the maintenance valve chamber is an above-ground pipe section.

[0009] Preferably, the maintenance valve chambers in the multiple connection tunnels are connected to each other.

[0010] Preferably, the pressure pipeline is connected to the diversion tunnel and the air cushion type surge chamber at an upward angle in the height direction.

[0011] Preferably, the two ends of the pressure pipeline are trumpet-shaped openings that gradually expand away from the maintenance valve.

[0012] Preferably, the pressure pipeline is externally covered with a concrete structure that fixes the pressure pipeline in the connection tunnel.

[0013] Preferably, the air pipeline comprises multiple longitudinal air pipelines and a transverse air pipeline, one end of each air cushion type surge chamber away from the diversion tunnel is connected to one longitudinal air pipeline, the multiple longitudinal air pipelines are connected to the transverse air pipeline, the transverse air pipeline is sequentially and spacedly provided with multiple air valves in the length direction, and each air valve is located between two longitudinal air pipelines.

[0014] Preferably, the interface of each air cushion type surge chamber connected to the corresponding longitudinal air pipeline is located more than 1 m above the highest wave level of the air cushion type surge chamber, and the interface of each air cushion type surge chamber connected to the corresponding pressure pipeline is located at the bottom of the air cushion type surge chamber.

[0015] Preferably, the system further comprises an air valve chamber, and the transverse air pipeline is accommodated in the air valve chamber in the form of an above-ground pipe section.

[0016] Preferably, each longitudinal air pipeline is accommodated in an air connection tunnel, and the outer part of each longitudinal air pipeline is covered with a concrete structure that tightly seals the remaining space in the air connection tunnel.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The maintenance guarantee system of the air cushion type surge chamber in the present application is provided with a plurality of air cushion type surge chambers, so that when one of the air cushion type surge chambers is maintained, the maintenance valve between the air cushion type surge chamber and the diversion tunnel is first closed to block the flow of water in the diversion tunnel into the air cushion type surge chamber to be maintained, and then the air passage valve between the air cushion type surge chamber and another adjacent air cushion type surge chamber is closed to completely isolate the air cushion type surge chamber to be maintained from the diversion tunnel, so that the diversion tunnel does not need to be emptied during the maintenance of the air cushion type surge chamber; at the same time, the air cushion type surge chambers that are not maintained still communicate with the diversion tunnel, so that at least one hydroelectric generator set can generate electricity normally, which is beneficial to reducing the loss of electric power of the power plant during the maintenance of the air cushion type surge chamber and improving the power generation benefit. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the planar arrangement of the maintenance guarantee system of the air cushion type surge chamber in the present application.

[0020] Figure 2 is a schematic view of the internal structure of the maintenance guarantee system of the air cushion type surge chamber in the present application.

[0021] Figure 3 is a schematic view of the cutout structure of the connection tunnel of the maintenance guarantee system of the air cushion type surge chamber in the present application.

[0022] Figure 4 is a schematic view of the cutout structure of the air passage connection tunnel of the maintenance guarantee system of the air cushion type surge chamber in the present application.

[0023] In the drawings, the reference signs are explained as follows:

[0024] 1, diversion tunnel

[0025] 2, connection tunnel

[0026] 3, air cushion type surge chamber

[0027] 4, pressure pipeline

[0028] 401, maintenance valve

[0029] 5, flange pipe joint

[0030] 6, air passage pipeline

[0031] 601, air passage valve

[0032] 602, longitudinal air passage pipe

[0033] 603, transverse air passage pipe

[0034] 7, maintenance valve chamber

[0035] 8. Vent valve chamber

[0036] 9. Vent connection hole DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described in conjunction with the drawings. These embodiments are only used to illustrate the present application, and are not intended to limit the present application.

[0038] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition, in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0041] Referring to Figure 1 The embodiment provides a maintenance guarantee system for air cushion type surge chambers, which comprises a diversion tunnel 1, a plurality of connection tunnels 2 and a plurality of air cushion type surge chambers 3. The plurality of connection tunnels 2 are arranged at intervals along the length direction of the diversion tunnel 1. Each connection tunnel 2 is provided with a pressure pipeline 4 extending along the length direction. The two ends of each pressure pipeline 4 are respectively connected to the diversion tunnel 1 and an air cushion type surge chamber 3. The middle part of the pressure pipeline 4 is provided with a maintenance valve 401. The two ends of the maintenance valve 401 are respectively provided with a flange pipe joint 5. The ends of the plurality of air cushion type surge chambers 3 away from the diversion tunnel 1 are connected to each other through a vent pipeline 6. The vent pipeline 6 is provided with a vent valve 601 between adjacent two air cushion type surge chambers 3. The two ends of each vent valve 601 are respectively provided with a flange pipe joint 5.

[0042] In actual use, referring toFigure 1 When all the air cushion surge chambers 3 are in operation, all the air vent valves 601 and the maintenance valves 401 are in the open state, so that the plurality of air cushion surge chambers 3 are in communication with each other, thereby improving the overall pressure regulating efficiency of the plurality of air cushion surge chambers 3 through pressure and energy sharing between the air cushion surge chambers 3, and meeting the regulating requirements of normal operation of all the hydroelectric generating units.

[0043] When one of the air cushion surge chambers 3 needs to be maintained, referring to Figure 1 First, the maintenance valve 401 between the air cushion surge chamber 3 and the diversion tunnel 1 is closed to block the flow of water in the diversion tunnel 1 to the air cushion surge chamber 3 to be maintained. Then, the air vent valve 601 between the air cushion surge chamber 3 and another adjacent air cushion surge chamber 3 is closed to completely isolate the air cushion surge chamber 3 to be maintained from the diversion tunnel 1. Then, the water and gas in the air cushion surge chamber 3 to be maintained are emptied. Finally, the flange pipe section 5 on the pressure pipeline 4 and the air vent pipeline 6 is disassembled, and the maintenance work is carried out in the air cushion surge chamber 3 through the exposed pressure pipeline opening and the air vent pipeline opening. During the maintenance of the single air cushion surge chamber 3, the diversion tunnel 1 does not need to be emptied, and the un-maintained air cushion surge chamber 3 still remains in communication with the diversion tunnel 1, which can at least meet the normal power generation of one hydroelectric generating unit, thereby reducing the power loss of the power plant during the maintenance of the air cushion surge chamber and improving the power generation efficiency.

[0044] It should be noted that, compared with the conventional single air cushion surge chamber structure, in order to save costs, the single air cushion surge chamber used in the embodiment is smaller in size and pressure regulating efficiency. When the cost is not considered, the single air cushion surge chamber in the embodiment is large enough to meet the regulating requirements of normal operation of all the hydroelectric generating units, and the power generation efficiency of the power plant during the maintenance of the single air cushion surge chamber will not be affected at all.

[0045] Referring to Figure 1 In a specific embodiment, the air cushion surge chamber 3 of the air cushion surge chamber maintenance guarantee system has two, and the connecting tunnel 2 also has two corresponding tunnels. The length, width and height of the two air cushion surge chambers 3 are the same and are arranged in parallel, so as to facilitate design, construction and operation and maintenance.

[0046] Preferably, in the embodiment, the maintenance valve 401 on the pressure pipeline 4 and the air vent valve 601 on the air vent pipeline 6 are both ball valves.

[0047] Specifically, in the embodiment, the maintenance valve 401 and the vent valve 601 are respectively provided with an expansion joint. The expansion joint on the maintenance valve 401 is located between the maintenance valve 401 and the flanged pipe section 5 on the pressure pipeline 4, and the expansion joint on the vent valve 601 is located between the vent valve 601 and the flanged pipe section 5 on the vent pipeline 6. The expansion joint can provide a buffer to prevent the vibration of the valve device when adjusting the opening degree of the maintenance valve 401 and the vent valve 601 from adversely affecting the pressure pipeline 4 and the vent pipeline 6.

[0048] Preferably, in the embodiment, the pressure pipeline 4 and the vent pipeline 6 are made of pressure steel pipes.

[0049] Preferably, referring to Figure 1 , the middle part of the connecting tunnel 2 is provided with a maintenance valve chamber 7. The maintenance valve 401 on the pressure pipeline 4 and the flanged pipe sections 5 at both ends are located in the maintenance valve chamber 7, and the pipe section of the pressure pipeline 4 located in the maintenance valve chamber 7 is an above-ground pipe section. The provision of the maintenance valve chamber 7 separates the maintenance valve 401 from the connecting tunnel 2, leaving sufficient space for the installation of the maintenance valve 401, the disassembly of the flanged pipe sections 5 on the pressure pipeline 4, and the entry of personnel into the air cushion type pressure regulating chamber 3 for maintenance. At the same time, the provision of the above-ground pipe section also facilitates the installation and operation of the maintenance valve 401.

[0050] Preferably, referring to Figure 1 , the maintenance valve chambers 7 in multiple connecting tunnels 2 are connected to each other, so that personnel can more conveniently and quickly control the maintenance valves 401 on multiple pressure pipelines 4.

[0051] Preferably, referring to Figure 2 , the pressure pipeline 4 is inclined in the height direction to connect the water diversion tunnel 1 and the air cushion type pressure regulating chamber 3. The inclination of the pressure pipeline 4 makes the exchange of water between the water diversion tunnel 1 and the air cushion type pressure regulating chamber 3 more smooth. At the same time, when the air cushion type pressure regulating chamber 3 is being maintained, the water in the air cushion type pressure regulating chamber 3 can be conveniently emptied.

[0052] Preferably, the two ends of the pressure pipeline 4 are gradually expanded in a trumpet shape away from the maintenance valve 401, thereby increasing the area of the pressure pipeline 4 reflecting water hammer and suppressing the adverse effects of water hammer.

[0053] Preferably, referring to Figure 3 , the pressure pipeline 4 is covered with a concrete structure, which fixes the pressure pipeline 4 in the connecting tunnel 2.

[0054] Preferably, referring to Figure 1The venting pipeline 6 comprises a plurality of longitudinal venting pipes 602 and a transverse venting pipe 603. Each air cushion pressure regulating chamber 3 is connected to a longitudinal venting pipe 602 at an end away from the water diversion tunnel 1. The plurality of longitudinal venting pipes 602 are connected to the transverse venting pipe 603. The transverse venting pipe 603 is provided with a plurality of venting valves 601 at intervals along the length direction. Each venting valve 601 is located between two longitudinal venting pipes 602.

[0055] Preferably, referring to Figure 2 The interface of each air cushion pressure regulating chamber 3 to the corresponding longitudinal venting pipe 602 is located above 1m of the highest wave level of the air cushion pressure regulating chamber 3. The interface of each air cushion pressure regulating chamber 3 to the corresponding pressure pipeline 4 is located at the bottom of the air cushion pressure regulating chamber 3.

[0056] Preferably, referring to Figure 1 and Figure 2 When the air cushion pressure regulating chamber 3 is maintained, the longitudinal venting pipe 602 at the top of the air cushion pressure regulating chamber 3 can be used as an exhaust passage, and the pressure pipeline 4 at the bottom of the air cushion pressure regulating chamber 3 can be used as a drainage pipeline. The drainage and exhaust are more smooth and do not interfere with each other. After the flange pipe pipe section 5 at the maintenance valve 401 and the venting valve 601 is removed, there will be one high maintenance opening and one low maintenance opening on the air cushion pressure regulating chamber 3, which is convenient for construction. The ventilation condition in the air cushion pressure regulating chamber 3 is better, and the safety of construction is more guaranteed. When danger occurs, there are two escape passages of the longitudinal venting pipe 602 and the pressure pipeline 4.

[0057] Preferably, referring to Figure 1 and Figure 2 The maintenance guarantee system of the air cushion pressure regulating chamber of the embodiment further comprises a venting valve chamber 8. The transverse venting pipe 603 is accommodated in the venting valve chamber 8 in the form of an above-ground pipe section. The above-ground pipe section of the transverse venting pipe 603 can facilitate the installation and operation of the venting valve 601. The venting valve chamber 8 leaves enough space for the removal of the flange pipe pipe section 5 on the venting pipeline 6 and for the maintenance of the air cushion pressure regulating chamber 3.

[0058] Preferably, referring to Figure 1 and Figure 4 Each longitudinal venting pipe 602 is accommodated in a venting connection hole 9, and the outside of each longitudinal venting pipe 602 is covered with a concrete structure. The concrete structure seals the remaining space in the venting connection hole 9 to prevent the high-pressure gas and high-pressure water in the air cushion pressure regulating chamber 3 from penetrating into the venting valve chamber 8.

[0059] The above only describes the preferred embodiments of the present application. It should be noted that those of ordinary skill in the art can make several improvements and replacements without departing from the technical principles of the present application. These improvements and replacements should also be considered within the protection scope of the present application.

Claims

1. A maintenance support system for an air cushion surge chamber, characterized in that: The invention comprises a water diversion tunnel (1), a plurality of connecting tunnels (2) and a plurality of air cushion type surge chambers (3), wherein the plurality of connecting tunnels (2) are arranged at intervals along the length direction of the water diversion tunnel (1), and each connecting tunnel (2) is provided with a pressure pipe (4) extending along the length direction, and the two ends of each pressure pipe (4) are respectively connected to the water diversion tunnel (1) and an air cushion type surge chamber (3), and an inspection valve (401) is provided in the middle of the pressure pipe (4), and flange pipe joints (5) are installed at both ends of the inspection valve (401), and the ends of the plurality of air cushion type surge chambers (3) away from the water diversion tunnel (1) are connected to each other through a ventilation pipe (6), and the ventilation pipe (6) is provided with a ventilation valve (601) between two adjacent air cushion type surge chambers (3), and flange pipe joints (5) are installed at both ends of each ventilation valve (601); The ventilation pipe (6) includes a plurality of longitudinal ventilation pipes (602) and a transverse ventilation pipe (603), one end of each air cushion type surge chamber (3) away from the water diversion tunnel (1) is connected to one longitudinal ventilation pipe (602), and the plurality of longitudinal ventilation pipes (602) are all in communication with one transverse ventilation pipe (603), and the transverse ventilation pipe (603) is provided with a plurality of ventilation valves (601) spaced in sequence along the length direction, and each ventilation valve (601) is located between two longitudinal ventilation pipes (602); It also includes a ventilation valve chamber (8), wherein the transverse ventilation pipe (603) is accommodated in the ventilation valve chamber (8) in the form of an exposed pipe section, and each of the longitudinal ventilation pipes (602) is accommodated in a ventilation connection hole (9), and the outside of each longitudinal ventilation pipe (602) is covered with a concrete structure, and the concrete structure seals the remaining space in the ventilation connection hole (9).

2. The maintenance support system for the air cushion surge chamber according to claim 1, characterized in that: A maintenance valve chamber (7) is provided in the middle of the connecting tunnel (2), the maintenance valve (401) on the pressure pipe (4) and the flange pipe joints (5) at both ends are located in the maintenance valve chamber (7), and the section of the pressure pipe (4) located in the maintenance valve chamber (7) is an exposed pipe section.

3. The maintenance support system for the air cushion surge chamber according to claim 2, characterized in that: The maintenance valve chambers (7) in the plurality of connecting tunnels (2) are interconnected.

4. The maintenance support system for the air cushion surge chamber according to claim 1, characterized in that: The pressure pipe (4) is connected to the water diversion tunnel (1) and the air cushion type pressure regulating chamber (3) at an elevation angle in the height direction.

5. The maintenance support system for the air cushion surge chamber according to claim 1, characterized in that: Both ends of the pressure pipe (4) are trumpet-shaped openings that gradually expand in a direction away from the inspection valve (401).

6. The maintenance support system for the air cushion surge chamber according to claim 1, characterized in that: The outside of the pressure pipe (4) is covered with a concrete structure, and the concrete structure fixes the pressure pipe (4) in the connecting tunnel (2).

7. The maintenance support system for the air cushion surge chamber according to claim 1, characterized in that: The interface of each air cushion type pressure regulating chamber (3) connected to the corresponding longitudinal ventilation pipe (602) is located above 1 m above the highest surge water level of the air cushion type pressure regulating chamber (3), and the interface of each air cushion type pressure regulating chamber (3) connected to the corresponding pressure pipe (4) is located at the bottom of the air cushion type pressure regulating chamber (3).

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