Overspeed shutdown protection device for hydraulic generator
By designing an adjustable distance between the speed test probe and the gear plate in the hydrowheel generator, the accurate speed test and timely shutdown protection problems caused by the fixed installation of the speed test probe in the prior art are solved, and better protection effects are achieved.
Patent Information
- Application Number
- CN202421228292.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In the shutdown protection devices of most hydrowheel generators on the market, the speed test probe is fixedly installed and cannot adjust the distance to the gear plate, resulting in the inability to accurately measure the speed and timely shutdown protection.
A water-wheel generator overspeed shutdown protection device is designed, including a speed tester, a range finder and an adjustment mechanism. The rangefinder is used to detect the distance between the speed measuring probe and the gear disc. The adjustment mechanism uses motor, gear and rotary rod and other components to adjust the distance between the speed measuring probe and the gear disc.
By adjusting the distance between the speed test probe and the gear plate, the precise speed measurement and timely shutdown protection of the hydrowheel generator are achieved, and the protection effect of the device is improved.
Smart Images
Figure CN222686804U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water turbine generators, in particular to an overspeed shutdown protection device for water turbine generators. Background Art
[0002] The unit speed signal is the most important electrical signal of the hydroelectric generator. The stability of the speed signal measurement is crucial to the safe operation of the unit. The gear speed measuring device is the main measurement method for the speed measurement of the hydro-generator unit and is widely used in hydropower plants.
[0003] During operation, a hydro-turbine generator set often runs away, so an overspeed protection device is needed to shut down the hydro-turbine generator set for protection. In the market, a speed probe is often installed inside the hydro-turbine generator to detect the rotation speed of the gear disc, and a controller matched with it is set to control the opening and closing of the hydro-turbine generator, thereby achieving a shutdown protection effect after overspeeding. However, the speed probes in most shutdown protection devices on the market are fixedly installed, and the distance between the speed probe and the gear disc cannot be adjusted, so that accurate speed measurement cannot be performed according to the actual situation of the hydro-turbine generator, and the entire hydro-turbine generator cannot be stopped in time. Utility Model Content
[0004] The purpose of the utility model is to provide a hydro-turbine generator overspeed shutdown protection device to solve the problem raised in the above background technology that the speed measuring probes in most shutdown protection devices on the market are fixedly installed and the distance between the speed measuring probe and the gear disc cannot be adjusted, so that accurate speed measurement cannot be performed according to the actual situation of the hydro-turbine generator, and the entire hydro-turbine generator cannot be stopped in time.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A hydro-generator overspeed shutdown protection device comprises a hydro-generator housing, a gear disc installed inside the hydro-generator housing, a mounting rod, and a speed measuring probe for measuring the speed of the gear disc, wherein the mounting rod is located inside the hydro-generator housing and is in a T-shape, a PLC controller is installed on the top surface of the horizontal rod end of the mounting rod, a distance measuring rod and a speed measuring rod are respectively fixed on the left side surface of the vertical rod end of the mounting rod near the upper and lower ends, the speed measuring probe is installed on the left side surface of the speed measuring rod, and a distance meter for detecting the distance between the speed measuring probe and the gear disc is installed on the left side surface of the distance measuring rod, and further comprises:
[0007] The adjusting mechanism is arranged inside the shell of the hydro-turbine generator and is used to adjust the distance between the speed measuring probe and the gear disc. The adjusting mechanism includes two rotating rods which are respectively connected to the inner walls on the left and right sides of the shell of the hydro-turbine generator, a screw rod coaxially fixed between the two rotating rods, a connecting rod fixed to the rear surface of the cross bar end of the mounting rod and threadedly connected to the screw rod, two gears located inside the shell of the hydro-turbine generator and used to drive one of the rotating rods to rotate, and a motor installed on the inner wall of the shell of the hydro-turbine generator and used to drive the two gears to rotate. The two gears are meshed with each other, and the connecting rod is slidably connected to the rear inner wall of the shell of the hydro-turbine generator.
[0008] As a preferred embodiment, the adjustment mechanism further includes a rotating shaft coaxially connected to the motor output shaft, and the two gears are coaxially fixed on the rotating shaft and the circumferential outer wall of the rotating rod on the same side.
[0009] As a preferred embodiment, a guide groove is provided on the rear inner wall of the hydro-generator housing, and a guide block slidably connected to the guide groove on the rear inner wall of the hydro-generator housing is fixed on the rear surface of the connecting rod.
[0010] As a preferred implementation, the speed measuring probe and the distance meter correspond to the positions of the toothed disc and are adapted in size, and the distance measuring end of the distance meter and the rear end face of the speed measuring probe are located on the same plane.
[0011] As a preferred embodiment, the distance between the screw and the inner wall of the rear side of the hydro-generator housing is 3-11 cm, and the distance between the screw and the gear disc is 10-26 cm.
[0012] As a preferred embodiment, the rangefinder further comprises a protection box fixed on the inner wall of the hydro-generator housing, the motor is located inside the protection box, and the rotating shaft passes through an outer wall of the protection box on one side close to the screw.
[0013] As a preferred embodiment, the longitudinal section of the guide groove on the rear inner wall of the hydro-generator housing is I-shaped, and the guide block is I-shaped to match the shape of the guide groove on the rear inner wall of the hydro-generator housing.
[0014] As a preferred implementation, the protection box does not contact the rotating rod on the same side, and the protection box does not contact the two gears.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] 1. The utility model can monitor the rotation speed of the gear disc in the hydro-turbine generator by setting a speed measuring probe. When the rotation speed of the gear disc exceeds the set value, the hydro-turbine generator can be controlled and shut down by the PLC controller, thereby playing a protective effect on the hydro-turbine generator. The distance between the speed measuring probe and the gear disc can be monitored by setting a speed measuring probe, and the distance between the speed measuring probe and the gear disc can be adjusted by setting an adjustment mechanism, so that accurate speed measurement can be performed according to the actual situation of the hydro-turbine generator, thereby making the protection effect of the entire device better, and being able to stop the entire hydro-turbine generator in time;
[0017] 2. In the utility model, a guide groove is provided on the rear inner wall of the hydro-turbine generator housing, and a guide block is fixed on the rear surface of the connecting rod, which is slidably connected to the guide groove on the rear inner wall of the hydro-turbine generator housing, so as to guide the movement of the connecting rod, and further guide the movement of the speed measuring probe and the rangefinder. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the internal structure of the casing of the hydro-generator in the utility model;
[0019] Figure 2 It is a partial exploded view of the utility model;
[0020] Figure 3 It is a schematic diagram of the overall structure of the adjustment mechanism in the utility model;
[0021] Figure 4 This is one of the partial exploded views of the adjustment mechanism in the utility model;
[0022] Figure 5 This is the second partial exploded view of the regulating mechanism in the utility model.
[0023] The meaning of each number in the figure is:
[0024] 1. Hydro-turbine generator casing; 2. Gear disc; 3. Mounting rod; 4. Speed measuring rod; 5. Speed measuring probe; 6. Distance measuring rod; 7. Distance meter; 8. PLC controller; 9. Adjustment mechanism; 91. Rotating rod; 92. Screw rod; 93. Connecting rod; 94. Guide block; 95. Gear; 96. Motor; 97. Rotating shaft; 98. Protective box. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] See also Figure 1-Figure 5 The utility model provides a technical solution: a hydro-turbine generator overspeed shutdown protection device, comprising a hydro-turbine generator housing 1, a toothed disc 2 installed inside the hydro-turbine generator housing 1, a mounting rod 3, and a speed measuring probe 5 for measuring the speed of the toothed disc 2, the mounting rod 3 is located inside the hydro-turbine generator housing 1 and is in a T-shaped shape, a PLC controller 8 is installed on the top surface of the horizontal rod end of the mounting rod 3, a distance measuring rod 6 and a speed measuring rod 4 are respectively fixed on the left surface of the vertical rod end of the mounting rod 3 near the upper and lower ends, the speed measuring probe 5 is installed on the left surface of the speed measuring rod 4, and a distance meter 7 for detecting the distance between the speed measuring probe 5 and the toothed disc 2 is installed on the left surface of the distance measuring rod 6, and also includes:
[0027] The adjusting mechanism 9 is arranged inside the hydro-turbine generator housing 1 and is used to adjust the distance between the speed measuring probe 5 and the gear disc 2. The adjusting mechanism 9 includes two rotating rods 91 respectively connected to the inner walls of the left and right sides of the hydro-turbine generator housing 1, a screw 92 coaxially fixed between the two rotating rods 91, a connecting rod 93 fixed to the rear surface of the cross bar end of the mounting rod 3 and threadedly connected to the screw 92, two gears 95 located inside the hydro-turbine generator housing 1 and used to drive one of the rotating rods 91 to rotate, and a motor 96 installed on the inner wall of the hydro-turbine generator housing 1 and used to drive the two gears 95 to rotate. The two gears 95 are meshed with each other, and the connecting rod 93 is slidably connected. Connected to the rear inner wall of the hydro-turbine generator housing 1, the speed measuring probe 5 can be set to monitor the rotational speed of the gear disc 2 in the hydro-turbine generator. When the rotational speed of the gear disc 2 exceeds the set value, the hydro-turbine generator can be controlled and shut down through the PLC controller 8, thereby protecting the hydro-turbine generator. The speed measuring probe 5 can be set to monitor the distance between the speed measuring probe 5 and the gear disc 2, and the adjustment mechanism 9 can be set to adjust the distance between the speed measuring probe 5 and the gear disc 2, so that accurate speed measurement can be performed according to the actual situation of the hydro-turbine generator, thereby making the protection effect of the entire device better and being able to stop the entire hydro-turbine generator in time.
[0028] In this embodiment, the adjustment mechanism 9 also includes a rotating shaft 97 coaxially connected to the output shaft of the motor 96, and two gears 95 are coaxially fixed on the rotating shaft 97 and the circumferential outer wall of the rotating rod 91 on the same side, which can smoothly drive the two gears 95 and the screw 92 to rotate.
[0029] In addition, a guide groove is provided on the rear inner wall of the hydro-turbine generator housing 1, and a guide block 94 is fixed on the rear surface of the connecting rod 93 and is slidably connected to the guide groove on the rear inner wall of the hydro-turbine generator housing 1, which can guide the movement of the connecting rod 93 and further guide the movement of the speed measuring probe 5 and the rangefinder 7.
[0030] Furthermore, the speed measuring probe 5 and the rangefinder 7 correspond to the positions of the gear disc 2 and are adapted in size, and the distance measuring end of the rangefinder 7 and the rear end face of the speed measuring probe 5 are located on the same plane, so that the distance between the speed measuring end of the speed measuring probe 5 and the gear disc 2 can be measured smoothly.
[0031] Specifically, the distance between the screw 92 and the rear inner wall of the hydro-generator casing 1 is 3-11 cm, and the distance between the screw 92 and the gear disc 2 is 10-26 cm. In this paper, the distance between the screw 92 and the rear inner wall of the hydro-generator casing 1 is preferably 10 cm, and the distance between the screw 92 and the gear disc 2 is preferably 22 cm, so that the rotation of the gear disc 2 and the screw 92 can be unimpeded.
[0032] It is worth noting that the rangefinder 7 also includes a protection box 98 fixed on the inner wall of the hydro-generator casing 1, the motor 96 is located inside the protection box 98, and the rotating shaft 97 passes through the outer wall of the protection box 98 on one side close to the screw 92, which can protect the motor 96 and thus extend the service life of the motor 96.
[0033] It is worth noting that the longitudinal cross-sectional shape of the guide groove on the inner wall of the rear side of the hydro-turbine generator housing 1 is I-shaped, and the shape of the guide block 94 is I-shaped to match the shape of the guide groove on the inner wall of the rear side of the hydro-turbine generator housing 1, which can make the connection between the guide block 94 and the guide groove on the inner wall of the hydro-turbine generator housing 1 tighter, thereby indirectly making the speed measuring probe 5 and the rangefinder 7 more stable during movement.
[0034] It is worth emphasizing that the protection box 98 and the rotating rod 91 on the same side do not contact each other, and the protection box 98 and the two gears 95 do not contact each other, so that the rotating rod 91 and the two gears 95 are not hindered during the rotation process.
[0035] Finally, it should be noted that the speed measuring probe 5, rangefinder 7, motor 96 and other components involved in the utility model are all universal standard parts or components known to technical personnel in this field, and their structures and principles are all known to technical personnel in this field through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and compatible controllers and power supplies, are connected through wires. The specific connection means should refer to the working principle of the utility model. The electrical connection between each electrical component is completed in a sequential working order, and the detailed connection means are all well-known technologies in the field.
[0036] In the specific use of this embodiment, when it is necessary to adjust the distance between the speed measuring probe 5 and the toothed disc 2, the motor 96 and the distance meter 7 are first started by the PLC controller 8, and the output shaft of the motor 96 rotates to drive the rotating shaft 97 coaxially connected thereto to rotate, and the rotating shaft 97 rotates to drive the same-side gear 95 coaxially fixed thereto to rotate, and the rotation of the gear 95 drives another gear 95 meshing therewith to rotate, and the rotation of the other gear 95 drives the same-side rotating rod 91 coaxially fixed thereto to rotate, and the rotation of the rotating rod 91 drives the screw 92 coaxially fixed thereto to rotate, and the rotation of the screw 92 drives the same-side rotating rod 91 threadedly connected thereto to rotate. The connecting rod 93 moves, and the connecting rod 93 moves under the guidance of the guide block 94 and the guide groove on the inner wall of the rear side of the hydro-generator housing 1. The movement of the connecting rod 93 drives the installation rod 3 fixed thereto to move, and the movement of the installation rod 3 drives the speed measuring rod 4 and the distance measuring rod 6 fixed thereto to move, thereby driving the speed measuring probe 5 and the distance meter 7 to move. The data measured by the distance meter 7 minus the length of the speed measuring probe 5 is equal to the distance between the speed measuring end of the speed measuring probe 5 and the gear disc 2. When the distance is appropriate, the distance meter 7 transmits the distance signal to the PLC controller 8, and the motor 96 is turned off through the PLC controller 8;
[0037] Then, the speed measuring probe 5 is started through the PLC controller 8, and the speed measuring probe 5 can monitor the rotation speed of the gear disc 2. When the rotation speed of the gear disc 2 exceeds the set value, the speed measuring probe 5 transmits the speed signal to the PLC controller 8, and the PLC controller 8 controls and shuts down the hydro-turbine generator, thereby protecting the hydro-turbine generator.
[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A hydro-generator overspeed shutdown protection device, comprising a hydro-generator housing (1), a gear disc (2) installed inside the hydro-generator housing (1), a mounting rod (3), and a speed measuring probe (5) for measuring the speed of the gear disc (2), characterized in that: The mounting rod (3) is located inside the housing (1) of the hydro-turbine generator and is in a T-shape. A PLC controller (8) is mounted on the top surface of the horizontal rod end of the mounting rod (3). A distance measuring rod (6) and a speed measuring rod (4) are respectively fixed on the left side surface of the vertical rod end of the mounting rod (3) near the upper and lower ends. The speed measuring probe (5) is mounted on the left side surface of the speed measuring rod (4). A distance meter (7) for detecting the distance between the speed measuring probe (5) and the gear disc (2) is mounted on the left side surface of the ranging rod (6). The invention also includes: An adjusting mechanism (9) is arranged inside the hydro-turbine generator housing (1) and is used to adjust the distance between the speed measuring probe (5) and the gear disc (2). The adjusting mechanism (9) comprises two rotating rods (91) respectively connected to the inner walls on the left and right sides of the hydro-turbine generator housing (1), a screw rod (92) coaxially fixed between the two rotating rods (91), a connecting rod (93) fixed to the rear surface of the cross rod end of the mounting rod (3) and threadedly connected to the screw rod (92), two gears (95) located inside the hydro-turbine generator housing (1) and used to drive one of the rotating rods (91) to rotate, and a motor (96) installed on the inner wall of the hydro-turbine generator housing (1) and used to drive the two gears (95) to rotate, wherein the two gears (95) are meshed with each other, and the connecting rod (93) is slidably connected to the rear inner wall of the hydro-turbine generator housing (1).
2. The overspeed shutdown protection device for a hydro-generator according to claim 1 is characterized in that: The adjustment mechanism (9) further comprises a rotating shaft (97) coaxially connected to the output shaft of the motor (96), and the two gears (95) are coaxially fixed on the rotating shaft (97) and the circumferential outer wall of the rotating rod (91) on the same side.
3. The overspeed shutdown protection device for a hydro-generator according to claim 1 is characterized in that: The rear inner wall of the hydro-generator housing (1) is provided with a guide groove, and the rear surface of the connecting rod (93) is fixed with a guide block (94) which is slidably connected to the guide groove of the rear inner wall of the hydro-generator housing (1).
4. The overspeed shutdown protection device for a hydro-generator according to claim 1 is characterized in that: The speed measuring probe (5) and the distance meter (7) both correspond to the positions of the toothed disc (2) and are adapted in size, and the distance measuring end of the distance meter (7) and the rear end face of the speed measuring probe (5) are located on the same plane.
5. The overspeed shutdown protection device for a hydro-generator according to claim 1 is characterized in that: The distance between the screw rod (92) and the inner wall of the rear side of the hydro-generator housing (1) is 3-11 cm, and the distance between the screw rod (92) and the gear disc (2) is 10-26 cm.
6. The overspeed shutdown protection device for a hydro-generator according to claim 2 is characterized in that: The distance meter (7) further comprises a protection box (98) fixed on the inner wall of the hydraulic generator housing (1), the motor (96) is located inside the protection box (98), and the rotating shaft (97) passes through an outer wall of the protection box (98) on one side close to the screw rod (92).
7. The overspeed shutdown protection device for a hydro-generator according to claim 3 is characterized in that: The longitudinal section of the guide groove on the inner wall of the rear side of the hydro-generator housing (1) is in an I-shape, and the guide block (94) is in an I-shape that matches the shape of the guide groove on the inner wall of the rear side of the hydro-generator housing (1).
8. The overspeed shutdown protection device for a hydro-generator according to claim 6 is characterized in that: The protection box (98) and the rotating rod (91) on the same side do not contact each other, and the protection box (98) and the two gears (95) do not contact each other.