Hydraulic control system based on water inlet heavy hammer ball valve

Abstract

The invention provides a hydraulic control system based on a water inlet heavy hammer ball valve, belongs to the technical field of valve technologies, and solves the technical problem of low opening and closing safety of the water inlet heavy hammer ball valve in the prior art. The device comprises a heavy hammer ball valve, a hydraulic driving unit, a locking unit, a pipeline unit and a sealing unit, the pipeline unit comprises an upstream connecting pipe and a downstream connecting pipe, and the upstream connecting pipe is welded to the power station water diversion pressure steel pipe and connected with one end of the heavy hammer ball valve. The other end of the heavy hammer ball valve is connected with a downstream connecting pipe through an expansion joint; a downstream flange of the expansion joint is connected with a water turbine water pipe flange; the heavy hammer ball valve is connected with the sealing unit, and the sealing position and a sealing state signal are fed back through the sealing unit; the locking unit is used for detecting the on-off state of the heavy hammer ball valve and outputting a corresponding signal; the driving unit is used for comparing signals sent by the locking unit and the sealing unit with preset signals and remotely determining whether the heavy hammer ball valve operates normally or not according to the comparison result.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a hydraulic control system based on a water inlet weight ball valve. Background Art

[0002] The turbine water inlet weight ball valve is installed on the pressure steel pipe in front of the water distribution ring pipe inlet. Its main functions are: when the turbine fails, it is used to cut off the water flow to ensure the safety of the unit; when the turbine is shut down, the water inlet valve is closed to facilitate the maintenance of the turbine without affecting the normal operation of other units; when in a power outage, the proximity switch can be adjusted to make the weight fall and complete the valve closing; when the turbine unit is shut down for a long time, the upstream water is cut off to reduce the leakage of the guide vane and prevent the unit from creeping.

[0003] The inlet weight ball valve directly affects the safety, reliability, stability and economic benefits of the power station operation. Therefore, the inlet weight ball valve used in the hydropower station has its special requirements: first, the use of a large diameter range, which may range from tens of centimeters to one or two hundred centimeters; second, the use of a large range of water heads, which can range from hundreds of meters to thousands of meters; third, high requirements for its safety, reliability and service life. From the current design and manufacturing status of ball valves in the domestic market, its structural characteristics and working principles are similar, that is, a movable valve seal is provided on the inlet and outlet sides of the valve in the valve body. When the valve is rotated to the closed position, pressurized water or pressure oil is needed to push the valve seal so that the valve seal presses the valve sealing surface to seal the water flow, resulting in low safety of power station operation. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic control system based on a water inlet weight ball valve, which solves the technical problem of low opening and closing safety of the water inlet weight ball valve in the prior art.

[0005] The present invention provides a hydraulic control system based on a water inlet weight ball valve, comprising: a weight ball valve, a hydraulic drive unit, a locking unit, a pipeline unit and a sealing unit;

[0006] The pipeline unit includes an upstream connecting pipe and a downstream connecting pipe, wherein the upstream connecting pipe is welded to the water diversion pressure steel pipe of the power station and connected to one end of the weight ball valve; the other end of the weight ball valve is connected to the downstream connecting pipe by an expansion joint, and the downstream flange of the expansion joint is connected to the turbine water pipe flange;

[0007] The weight ball valve for controlling the flow of the medium in the pipeline is connected to the sealing unit, and the sealing position and sealing state signal are fed back through the sealing unit;

[0008] The locking unit is connected to the weight ball valve and is used to detect the switch state of the weight ball valve and output a corresponding signal;

[0009] The driving unit is connected to the locking unit and the sealing unit respectively, and is used to compare the signals sent by the locking unit and the sealing unit with the preset signals, and remotely determine whether the heavy hammer ball valve is operating normally according to the comparison results.

[0010] Furthermore, the weight ball valve comprises: a valve body, a ball, a valve shaft, and a valve shaft bearing;

[0011] The ball is installed inside the valve body through the valve shaft and the valve shaft bearing, and rotates or slides in the valve body to serve as an opening and closing component of the heavy hammer ball valve.

[0012] Furthermore, the sealing unit includes a valve body sealing ring, a valve cover, and a valve sealing ring;

[0013] The valve body sealing ring is arranged on the valve body to protect the valve body from being washed by the medium;

[0014] The valve cover is connected to the valve body, supports the valve shaft and seals the direct connection between the valve body and the valve cover;

[0015] The valve sealing ring is connected to the valve and is used for sealing the connection between the valve and the ball.

[0016] Further, the pipeline unit includes a bypass valve;

[0017] The bypass valve is arranged on the bypass pipeline of the weight ball valve to control the opening and closing of the main pipeline. Opening the bypass pipeline can allow the equipment to continue to operate.

[0018] Furthermore, the pipeline unit also includes a differential pressure device;

[0019] The differential pressure device is arranged on the upstream connecting pipe and the downstream expansion joint to detect the pressure difference before and after the weight ball valve is opened.

[0020] Furthermore, the pipeline unit also includes an air valve;

[0021] The air valve is arranged at the top of the downstream expansion joint to meet the requirements of exhausting air when the water distribution ring pipe is filled with water and replenishing air when the water inlet valve is closed.

[0022] Further, it also includes an exhaust valve;

[0023] The exhaust valve is arranged on the top of the valve body to discharge the air in the weight ball valve.

[0024] Further, it also includes a drain hole and a manual ball valve;

[0025] The drain hole is arranged at the bottom of the valve body, and is used for draining the heavy hammer ball valve;

[0026] The manual ball valve is connected to the sewage discharge hole and is used to control the opening and closing of the sewage discharge hole.

[0027] Further, the locking device includes a hydraulically controlled locking device, a first mechanical locking device and a second mechanical locking device;

[0028] The hydraulically controlled locking device is arranged on the heavy hammer ball valve operating relay to ensure that the valve is locked when closing the valve and outputs a locking state signal;

[0029] The first mechanical locking device is arranged on the operating crank of the weight ball valve, and is used to ensure manual mechanical locking of the valve when it is in the open or closed position, and has a locking state signal output;

[0030] The second mechanical locking device is arranged on the upstream flange of the valve body and is used for inspecting the mechanical locking of the valve body sealing ring.

[0031] The present invention provides a hydraulic control system based on a water inlet weight ball valve. The system adopts an electrical control system and adopts PLC intelligent control to simplify the electrical circuit, has a strong self-diagnosis function, and can be controlled locally and remotely; has a high degree of automation, is safe and reliable; can realize unmanned operation of the hydropower station, and when the hydropower station is out of power, the accumulator releases electric energy, which can realize emergency water dynamic closing of the ball valve, providing sufficient safety guarantee for the safe operation of the unit; the system of the present invention adopts a weight ball valve, and after the valve is fully opened, the flow channel is a smooth through hole, and the hydraulic loss is small; the present invention can improve the working safety of the ball valve while also improving the working efficiency of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of a heavy hammer ball valve provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a hydraulic control system based on a water inlet weight ball valve provided in an embodiment of the present invention;

[0035] Description of the drawings: 1-valve body, 2-valve cover, 3-ball, 4-valve shaft, 5-valve body sealing ring, 6-bypass valve and 7-bypass pipeline. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The terms "including" and "having" and any variations thereof mentioned in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0038] See also Figure 1 and Figure 2 Shown: A hydraulic control system based on a water inlet weight ball valve.

[0039] The weight ball valve comprises: a valve body 1, a ball body 3, a valve shaft 4, and a valve shaft bearing (not shown in the figure);

[0040] The ball 2 is installed inside the valve body 1 through the valve shaft and the valve shaft bearing, and rotates or slides inside the valve body 1 to serve as an opening and closing component of the weight ball valve.

[0041] The sealing unit includes a valve body sealing ring 5, a valve cover 2, and a valve sealing ring (not shown in the figure);

[0042] The valve body sealing ring 5 is arranged on the valve body 1 to protect the valve body 1 from being washed by the medium;

[0043] The valve cover 2 is connected to the valve body 1, supports the valve shaft 4 and seals the direct connection between the valve body 1 and the valve cover 2;

[0044] The valve sealing ring is connected to the valve and is used for sealing the connection between the valve and the ball.

[0045] The pipeline unit includes a bypass valve 6;

[0046] The bypass valve is arranged on the bypass pipeline 7 of the weight ball valve to control the opening and closing of the main pipeline. Opening the bypass pipeline 7 allows the equipment to continue to operate.

[0047] An upstream connecting pipe is arranged on the upstream side of the weight ball valve, on which a bypass water diversion pipe and a pressure measuring joint are arranged, and the upstream connecting pipe is connected to the flange of the weight ball valve.

[0048] A sleeve expansion joint is installed on the downstream side of the heavy hammer ball valve to facilitate the installation, disassembly and maintenance of the water inlet valve. A bypass water diversion pipe, a pressure measuring joint, a water distribution ring pipe drainage pipe, and an automatic air inlet and outlet pipe are arranged on it. The downstream flange of the expansion joint is connected to the flange of the turbine water distribution pipe.

[0049] A bypass valve and a differential pressure transmitter are provided on the upstream connecting pipe and the downstream expansion joint of the heavy hammer ball valve to fill the water distribution ring pipe with water and balance the pressure;

[0050] Check whether the weight ball valve is within the specified pressure difference range;

[0051] If so, the valve can be opened smoothly;

[0052] If not, the valve cannot be opened safely.

[0053] When the heavy hammer ball valve is closed, check whether the hydraulic control locking device sends a closing locking signal;

[0054] If so, the heavy hammer ball valve is safely closed;

[0055] If not, the weight ball valve is not closed.

[0056] During the manual mechanical locking process when the weight valve is opened or closed, it is detected whether the first mechanical locking device sends a corresponding status signal.

[0057] If yes, the manual mechanical locking is successful;

[0058] If not, the manual mechanical locking fails.

[0059] The specific operation steps of the water turbine inlet weight ball valve of the present invention are as follows:

[0060] Step s1: Open the valve.

[0061] Step s1-2: Start the oil pump motor unit to deliver the pressure oil to the energy storage tank until the pressure reaches the upper limit of the system working pressure and then stop.

[0062] Step s1-3: Open the bypass hydraulic valve, and the medium enters the turbine water distribution ring pipe through the bypass pipeline. When the pressure difference of the weight ball valve reaches the preset value, that is, 30% of the maximum difference on both sides of the weight ball valve meets the standard.

[0063] Step s1-4: Open the working seal pressure oil source, withdraw the valve body seal ring, release the main servomotor hydraulic lock, the hydraulic double seal weight ball valve main servomotor electromagnetic reversing valve actuates, and the pressure oil enters the main servomotor rodless chamber, pushing the main servomotor piston to drive the crank and valve shaft to rotate.

[0064] Step s1-5: Open the hydraulic double-seal weight ball valve, the main relay pressure-maintaining solenoid valve is actuated, the valve enters the pressure-maintaining state, and provides hydraulic holding force to ensure that the weight ball valve is fully opened.

[0065] Step s2, close the valve.

[0066] Step s2-1, the electromagnetic reversing valve of the main relay of the hydraulic double-seal weight ball valve is actuated to open the oil return line, and the weight falls to close the valve.

[0067] Step s2-2, the main relay hydraulic lock is put into operation, and the valve body sealing ring is put into operation. The bypass valve is closed and the hydraulic weight ball valve remains in a closed state.

[0068] Step s3, close the valve when the system is under maintenance.

[0069] Step s3-1, the main relay electromagnetic reversing valve of the hydraulic double-seal heavy hammer ball valve is actuated and the valve is closed.

[0070] Step s3-2, the main relay hydraulic lock is put into operation, the maintenance seal pressure oil source is opened, the maintenance seal ring is put into operation, the main relay mechanical lock is manually put into operation, and the maintenance seal ring mechanical lock is manually put into operation.

[0071] Step s3-3, close the bypass valve and keep the hydraulic weight ball valve closed.

[0072] Specifically, after the heavy hammer ball valve is fully opened or closed, the travel switch gives a valve fully opened or closed signal. After the lock is fully engaged or pulled out, the travel switch gives a fully engaged or pulled out signal.

[0073] Specifically, when opening the valve for the first time or after maintenance, the mechanical lock of the maintenance seal and the mechanical lock of the main relay installed on the crank must be released first; this lock is also used for valve positioning during equipment installation.

[0074] Specifically, when the turbine unit and the main valve working seal ring need to be inspected and maintained, the main relay mechanical lock and the inspection seal mechanical lock must be put into effect after closing the hydraulic double-seal hammer ball valve, and then the operating oil circuit of the relay can be cut off.

[0075] Specifically, a sewage outlet is arranged at the bottom of the valve body sealing ring and the valve sealing ring.

[0076] This embodiment has the following beneficial effects:

[0077] 1. A drain port is provided at the bottom of the valve body seal ring and the valve seal ring to discharge the medium in the working chamber of the seal ring, which is convenient for inspection and maintenance.

[0078] 2. The working seal ring, maintenance seal ring, relay mechanical and hydraulic lock are designed with travel switches. After they are put into operation or released, the travel switch will give out the input and release signals to realize the interlocking protection of the entire water inlet hammer ball valve to avoid malfunction of the seal ring.

[0079] 3. When the valve in this embodiment rotates, the movable sealing ring is disengaged first, so that the sealing surface has no rotational friction, the ball valve has a small opening distance force, and has a long service life. Without disassembling the valve body, the upstream and downstream sealing devices of the valve can be disassembled and replaced.

[0080] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0081] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0082] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] The device provided in the embodiment of the present invention may be specific hardware on the device or software or firmware installed on the device. The implementation principle and technical effects of the device provided in the embodiment of the present invention are the same as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment. It can be clearly understood by those skilled in the art that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the aforementioned method embodiment, and will not be repeated here.

[0084] In several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0085] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A hydraulic control system based on a water inlet weight ball valve, characterized in that: include: Heavy hammer ball valve, hydraulic drive unit, locking unit, piping unit and sealing unit; The pipeline unit includes an upstream connecting pipe and a downstream connecting pipe, wherein the upstream connecting pipe is welded to the water diversion pressure steel pipe of the power station and connected to one end of the weight ball valve; the other end of the weight ball valve is connected to the downstream connecting pipe by an expansion joint, and the downstream flange of the expansion joint is connected to the turbine water pipe flange; The weight ball valve for controlling the flow of the medium in the pipeline is connected to the sealing unit, and the sealing position and sealing state signal are fed back through the sealing unit; The locking unit is connected to the weight ball valve and is used to detect the switch state of the weight ball valve and output a corresponding signal; The driving unit is connected to the locking unit and the sealing unit respectively, and is used to compare the signals sent by the locking unit and the sealing unit with the preset signals, and remotely determine whether the heavy hammer ball valve is operating normally according to the comparison results.

2. The system according to claim 1, characterized in that The weight ball valve comprises: a valve body, a ball, a valve shaft, and a valve shaft bearing; The ball is installed inside the valve body through the valve shaft and the valve shaft bearing, and rotates or slides in the valve body to serve as an opening and closing component of the heavy hammer ball valve.

3. The system according to claim 2, characterized in that The sealing unit includes a valve body sealing ring, a valve cover, and a valve sealing ring; The valve body sealing ring is arranged on the valve body to protect the valve body from being washed by the medium; The valve cover is connected to the valve body, supports the valve shaft and seals the direct connection between the valve body and the valve cover; The valve sealing ring is connected to the valve and is used for sealing the connection between the valve and the ball.

4. The system according to claim 1, characterized in that The pipeline unit includes a bypass valve; The bypass valve is arranged on the bypass pipeline of the weight ball valve to control the opening and closing of the main pipeline. Opening the bypass pipeline can allow the equipment to continue to operate.

5. The system according to claim 4, characterized in that The pipeline unit also includes a differential pressure device; The differential pressure device is arranged on the upstream connecting pipe and the downstream expansion joint to detect the pressure difference before and after the weight ball valve is opened.

6. The system according to claim 1, characterized in that The pipeline unit also includes an air valve; The air valve is arranged at the top of the downstream expansion joint to meet the requirements of exhausting air when the water distribution ring pipe is filled with water and replenishing air when the water inlet valve is closed.

7. The system according to claim 1, characterized in that Also includes an exhaust valve; The exhaust valve is arranged on the top of the valve body to discharge the air in the weight ball valve.

8. The system according to claim 1, characterized in that It also includes a drain hole and a manual ball valve; The drain hole is arranged at the bottom of the valve body, and is used for draining the heavy hammer ball valve; The manual ball valve is connected to the sewage discharge hole and is used to control the opening and closing of the sewage discharge hole.

9. The system according to claim 1, characterized in that The locking device comprises a hydraulically controlled locking device, a first mechanical locking device and a second mechanical locking device; The hydraulically controlled locking device is arranged on the heavy hammer ball valve operating relay to ensure that the valve is locked when closing the valve and outputs a locking state signal; The first mechanical locking device is arranged on the operating crank of the weight ball valve, and is used to ensure manual mechanical locking of the valve when it is in the open or closed position, and has a locking state signal output; The second mechanical locking device is arranged on the upstream flange of the valve body and is used for inspecting the mechanical locking of the valve body sealing ring.

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