Volute mandoor safety protection device during water turbine maintenance

Abstract

The utility model discloses a safety protection device for a volute manhole during water turbine maintenance, which comprises a volute manhole mounted on an outer shell of a water turbine, the volute manhole is circular and extends towards the outer side of the water turbine, and an annular flange surface is arranged on the volute manhole along the outer side of the water turbine. A movable trunnion assembly is arranged on the volute manhole, a mesh plate door is arranged on the movable trunnion assembly, the volute manhole drives the mesh plate door to be opened and closed through the movable trunnion assembly, electromagnetic attractors matched with the annular flange faces are arranged at the two ends of the mesh plate door, and an access control system is further arranged on the mesh plate door. When a speed regulator system test and a servomotor water guide mechanism action test are carried out, other irrelevant access to a channel can be effectively prevented through the access controller, so that potential safety hazards are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine maintenance, in particular to a safety protection device for a volute entry door during water turbine maintenance. Background Art

[0002] As the core equipment of a hydropower station, the operating efficiency and safety of a water turbine are crucial to the stable operation of the entire power station. During the maintenance and overhaul of a water turbine, the volute entry door (hereinafter referred to as the volute door) is an important channel for maintenance personnel to enter the volute for maintenance work. However, due to the complex internal environment of the volute, there are potential dangers such as governor system testing and water guide mechanism mechanical action testing during the overhaul of the unit. Maintenance personnel face high safety risks when entering the volute without knowing it. Chinese utility model patent: CN218862387U discloses a volute entry door opening and closing device. The application realizes the rapid opening of the volute entry door through components such as an entry door cover and a U-shaped frame, but the application has a complex structure. In the prior art, when most units are overhauled, the volute door of the water turbine has no safe and effective control management, and only has simple warning signs (no entry). These measures often make it difficult to control the entry of other personnel when there is no one on duty, resulting in maintenance personnel entering without fully understanding the governor system action test or in an emergency, increasing the probability of accidents. At the same time, the existing safety warning measures for the volute entrance doors of hydropower stations also have certain limitations, which are mainly manifested in the following aspects: the existing volute doors of hydropower stations cannot quickly cut off the entry channel in an emergency (governor system pipeline boosting and relay water guide mechanism action test), posing certain safety hazards. The existing volute doors of hydropower stations usually only provide basic text or graphic warnings, which are difficult to provide sufficient safety reminders under various environmental conditions. Most of the warning signs installed on the volute doors of existing hydropower stations rely only on visual warnings, and lack multi-sensory warning methods such as sound and light, and cannot effectively respond to emergencies. Utility Model Content

[0003] This utility model patent aims to solve the deficiencies in the existing technology and provide a volute entry door safety protection device during turbine maintenance, which is used to solve the technical problem that the volute door cannot quickly cut off the entry channel when the movable guide vanes of the turbine water guide mechanism are tested during the debugging of the unit governor system.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a safety protection device for the volute entrance door during turbine maintenance, comprising an annular flange surface installed on the outside of the volute entrance hole, a movable hinge assembly is provided on the volute entrance hole, a mesh door is provided on the movable hinge assembly, the mesh door is rotatably connected to the volute entrance hole through the movable hinge assembly, electromagnetic suction is provided at both ends of the mesh door to cooperate with the annular flange surface, and an access control system is also provided on the mesh door, and the access control system is electrically connected to the electromagnetic suction through a wire.

[0005] Preferably, the movable hinge assembly includes two groups of rotating hinge shafts symmetrically arranged at the top and bottom of the volute entrance hole, and the rotating hinge shafts are hinged with arc-shaped connecting plates. The two groups of arc-shaped connecting plates are fixedly connected to one end away from the rotating hinge shafts with a connecting rod, and the connecting rod passes through the central axis of the mesh door and is fixedly connected to the mesh door.

[0006] Preferably, a plurality of through holes are provided on the mesh door, and a handle is also provided on the mesh door.

[0007] Preferably, the mesh door plate is circular and made of stainless steel.

[0008] Preferably, an audible and visual alarm and a detection sensor are provided on the inner side of the volute entrance hole, and the audible and visual alarm and the detection sensor are connected to the access control system.

[0009] Preferably, the annular flange surface is made of iron material.

[0010] Beneficial effects of the utility model:

[0011] The utility model provides a hydropower station turbine volute door access control safety device, which can effectively block other irrelevant entry channels through the access control controller during the governor system test and the relay water guide mechanism action test, thereby avoiding potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0013] In the figure: 1. Volute entry door; 2. Electromagnetic suction; 3. Access control system; 4. Active hinge assembly; 5. Mesh door; 6. Handle; 11. Annular flange surface; 41. Rotating hinge axis; 42. Arc-shaped connecting plate; 43. Connecting rod. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1As shown, a safety protection device for the volute entry door during turbine maintenance includes an annular flange surface 11 installed on the outside of the volute entry hole 1, characterized in that the volute entry hole 1 is provided with a movable hinge assembly 4, and a mesh door 5 is provided on the movable hinge assembly 4. The mesh door 5 is rotatably connected to the volute entry hole 1 through the movable hinge assembly 4, and electromagnetic suction 2 that cooperates with the annular flange surface 11 is provided at both ends of the mesh door 5. The mesh door 5 is also provided with an access control system 3, and the access control system 3 is electrically connected to the electromagnetic suction 2 through a wire. In this embodiment, when a worker is in use The staff can open and close the volute manhole 1 through the password unlocking, lock card unlocking and mobile phone NFC unlocking functions set by the access control system, ensuring that non-construction personnel can be effectively prevented from entering without authorization. At the same time, the multi-section hinged movable hinge assembly 4 makes it easier for staff to open and close the mesh door 5. When in use, the "No Entry" picture and text signs can be sprayed on the outside of the mesh door. Compared with traditional signboards, it can save space and is not easy to lose or damage. The access control system 3 can control the power on and off of the electromagnetic suction 2, and the suction part can be the volute annular flange surface 11.

[0016] Preferably, the movable hinge assembly 4 includes two groups of rotating hinge shafts 41 symmetrically arranged at the top and bottom of the volute entrance hole 1, and the rotating hinge shafts 41 are hinged with arc-shaped connecting plates 42. The two groups of arc-shaped connecting plates 42 are fixedly connected with connecting rods 43 at one end away from the rotating hinge shafts 41. The connecting rods 43 pass through the central axis of the mesh door 5 and are fixedly connected to the mesh door 5. In this embodiment, the turbine volute entrance hole 1 is large in size and heavy in weight, and it is more difficult for workers to open and close it when entering for maintenance. Therefore, a movable hinge assembly 4 is provided, and the mesh door 5 can be easily opened through multi-section hinges. At the same time, the design of the overall mesh door 5 being separated from the volute entrance hole 1 can provide multiple electromagnetic suctions 2 on the mesh door 5 to make the mesh door 5 and the volute entrance hole 1 more sealed.

[0017] Preferably, a plurality of through holes are provided on the mesh door 5, and a handle 6 is also provided on the mesh door 5. When in use, when the operator finishes work, the door handle 6 can be manually driven by the movable hinge to move to the right, and the movable hinge assembly 4 drives the mesh door 5 to close, so that the mesh door can quickly cover the volute door. At the same time, a plurality of through holes can be opened on the mesh door 5 to form a circular punching mesh, and the internal situation of the volute can be observed at any time through the through holes.

[0018] Preferably, the mesh door plate 5 is circular and made of stainless steel. The mesh door 5 adopts a circular shape that matches the volute manhole 1. At the same time, the door body is made of stainless steel to prevent rust after long-term use.

[0019] Preferably, an audible and visual alarm and a detection sensor are provided on the inner side of the volute entrance hole 1, and the audible and visual alarm and the detection sensor are connected to the access control system. When in use, when the staff fails to close the electric switch door by mistake and an outsider enters by mistake, the audible and visual alarm is used to remind the staff near the electric switch door; when in use, a surveillance camera can be installed above the door frame of the electric switch door to cooperate with the audible and visual alarm for early warning. At the same time, when the detection sensor detects that a person has accidentally entered the volute entrance hole 1, a detection signal is sent to the access controller, and the access controller controls the audible and visual alarm to alarm.

[0020] Preferably, the annular flange surface 11 is made of iron material. When in use, the annular flange surface can be made of carbon steel material. When the electromagnetic suction is energized, magnetic force is generated, and the electromagnetic suction is attracted and connected to flange materials such as carbon steel or stainless steel to achieve reliable locking and fixation of both sides of the mesh door; when the electromagnetic suction is powered off, the magnetic force of the electromagnetic suction disappears, making it convenient to manually retract the mesh door. At the same time, a suction piece can also be set at the corresponding position of the annular flange surface 11 and the electromagnetic suction 2. The suction piece is made of magnetic material. At this time, the annular flange surface 11 can be made of other non-magnetic materials, such as materials with better corrosion resistance.

[0021] The specific working method of this application is: the mesh door 5 is set to a circular shape, and a plurality of through holes are evenly opened on the mesh door 5. The mesh door 5 is installed on the movable hinge assembly 4. The electromagnetic suction 2 is fixed on both sides of the mesh door 5 to attract the flange surface of the volute door. The electromagnetic suction 2 on both sides of the mesh door 5 is connected to the access control system 3 through a wire. The access control system 3 can realize the switch control of the electromagnetic suction 2. Specifically, by triggering the "on" button on the access control system 3, the electromagnetic suction 2 is in no magnetic state at this time, and the door handle 6 can be manually moved to the left. At this time, the movable hinge assembly 4 drives the mesh door 5 to move to the left, and the volute door is open. At this time, the staff can enter the volute door to perform operations. After the work is completed, the staff can manually drive the movable hinge assembly 4 to move to the right with the door handle 6, and the movable hinge assembly drives the mesh door 5 to close, so that the mesh door 5 can quickly cover the volute door. By triggering the "close" button on the access control system 3, the electromagnetic suction 2 is in the closed state at this time, which can prevent other people from accidentally entering the volute door. In this embodiment, the access control system also integrates the functions of password unlocking, lock card unlocking and mobile phone NFC unlocking.

[0022] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A safety protection device for a volute access door during maintenance of a turbine, comprising an annular flange surface (11) mounted on the outside of a volute access hole (1), characterized in that: The volute manhole (1) is provided with a movable hinge assembly (4), and a mesh door (5) is provided on the movable hinge assembly (4). The mesh door (5) is rotatably connected to the volute manhole (1) through the movable hinge assembly (4). Electromagnetic suction (2) cooperating with the annular flange surface (11) is provided at both ends of the mesh door (5). An access control system (3) is also provided on the mesh door (5), and the access control system (3) is electrically connected to the electromagnetic suction (2) through a wire.

2. A safety protection device for the volute access door during maintenance of a turbine according to claim 1, characterized in that: The movable hinge assembly (4) comprises two groups of rotating hinge shafts (41) symmetrically arranged at the top and bottom of the volute entrance hole (1), the rotating hinge shafts (41) are hinged with arc-shaped connecting plates (42), and the ends of the two groups of arc-shaped connecting plates (42) away from the rotating hinge shafts (41) are fixedly connected with connecting rods (43), and the connecting rods (43) pass through the central axis of the mesh door (5) and are fixedly connected to the mesh door (5).

3. The safety protection device for the volute access door during maintenance of a turbine according to claim 2, characterized in that: The mesh door (5) is provided with a plurality of through holes, and the mesh door (5) is also provided with a handle (6).

4. The safety protection device for the volute access door during maintenance of a turbine according to claim 1, characterized in that: The mesh door (5) is circular and made of stainless steel.

5. The safety protection device for the volute access door during maintenance of a turbine according to claim 1, characterized in that: An audible and visual alarm and a detection sensor are provided inside the volute manhole (1), and the audible and visual alarm and the detection sensor are connected to an access control system.

6. The safety protection device for the volute access door during maintenance of a turbine according to claim 1, characterized in that: The annular flange surface (11) is made of iron material.

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