A device for detecting and positioning misalignment of guide vanes of a water turbine

Abstract

The present invention discloses a device for detecting and positioning misalignment of guide vanes of a water turbine, comprising a connecting member, a displacement sensor, and a PLC; the first end of the connecting member is connected to the side wall of the friction plate; the displacement sensor is installed on the side wall of the crank arm; the second end of the connecting member is connected to the action end of the displacement sensor; the displacement sensor is electrically connected to the PLC. The present invention utilizes two sets of universal heads and positioning grooves of a base to convert the slip of the friction device into linear displacement, and the use of the universal head and the double-headed screw makes installation more convenient; the capacitance sensor module is used to convert the displacement into communication volume, and only multiple sets of the present application are required to complete the displacement signal collection of all guide vanes, and the early warning value can be set in combination with the PLC, and the specific position of the misaligned guide vane can be clearly judged according to the alarm data; the device can be used as a guide vane misalignment detection and positioning alarm to greatly improve the stability of equipment operation and the ability to quickly locate.

Description

Technical Field

[0001] The invention relates to the technical field of guide vane displacement detection and positioning, and in particular to a turbine guide vane misalignment detection and positioning alarm device. Background Art

[0002] The guide vanes of a hydro-turbine generator set are generally installed around the runner of the turbine. They are driven by the crank arm and rotate with the rotation of the control ring. They are important components for regulating the flow rate of the hydro-turbine generator set. In order to ensure that when a guide vane is blocked by foreign objects, the normal movement of other guide vanes is not affected, the connection between the guide vane and the crank arm cannot be directly rigidly connected, but connected through a friction device to ensure that other guide vanes can be closed normally when blocking occurs. When the guide vane is stuck by foreign objects or refuses to move due to other reasons, slippage will occur between the two friction surfaces of the friction device that controls the refusing guide vane. Through the travel switch on the friction device, it is possible to monitor whether the guide vane is misaligned and send out a fault alarm signal.

[0003] The general detection method for the slip between the two friction surfaces of the friction device is: use the positioning block installed on the friction plate to cooperate with the travel switch on the crank arm to detect whether the guide vane has relative displacement, and connect the travel switches of all guide vanes in series. When any travel switch is actuated, a guide vane misalignment alarm signal is issued.

[0004] The above method has the following problems: 1. The detection accuracy of the travel switch is low, the sensitivity is poor, and there is a phenomenon of false movement or immobility; 2. The positioning block must be in contact with the travel switch, which is inconvenient to install; 3. Only one alarm signal cannot locate the specific misplaced guide vane, and professionals are required to find the misplaced guide vane on site; 4. The alarm is a switch signal, and it cannot predict the guide vane misalignment that will occur. Therefore, when it is detected, the guide vane has been seriously misaligned, which seriously affects the operation of the unit. Therefore, it is necessary to design a device with micro-displacement detection and positioning alarm.

[0005] Therefore, it is necessary to develop a turbine guide vane misalignment detection and positioning alarm device to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to design a turbine guide vane misalignment detection and positioning alarm device in order to solve the above-mentioned problem.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A device for detecting and positioning misalignment of guide vanes of a water turbine, comprising:

[0009] A connecting member; a first end of the connecting member is connected to the side wall of the friction plate;

[0010] Displacement sensor; the displacement sensor is installed on the side wall of the toggle arm; the second end of the connecting member is connected to the acting end of the displacement sensor;

[0011] PLC; the displacement sensor is electrically connected to the PLC.

[0012] Specifically, the displacement sensor includes a capacitive grating sensor and a reflective grating scale, and the capacitive grating sensor and the reflective grating scale are cooperatively connected.

[0013] Specifically, the water turbine guide vane misalignment detection and positioning alarm device further includes a base and a grating scale seat. The capacitive grating sensor is installed on the base, the reflective grating scale is installed on the grating scale seat, and the second end of the connecting member is connected to the grating scale seat.

[0014] Specifically, a chute is provided in the base, the grating scale seat is slidably installed in the chute, and the capacitive grating sensor is installed at the bottom of the chute.

[0015] Preferably, an outlet hole is provided at the bottom of the chute in the base, and the signal line of the capacitive grating sensor passes through the outlet hole.

[0016] Specifically, the connecting member includes:

[0017] A first universal joint; the first end of the first universal joint is connected to the side wall of the friction plate;

[0018] A second universal joint; the first end of the second universal joint is connected to the acting end of the displacement sensor; the second end of the first universal joint and the second end of the second universal joint are connected.

[0019] Preferably, the connecting member further includes a double-headed screw. The second end of the first universal joint is threadedly connected to the first end of the double-headed screw, and the second end of the second universal joint is threadedly connected to the second end of the double-headed screw.

[0020] Preferably, a first nut is threadedly connected to the first end of the double-headed screw, and a third nut is threadedly connected to the second end of the double-headed screw.

[0021] Preferably, the first end of the first universal joint and the first end of the second universal joint are both a screw. The first end of the first universal joint is threadedly connected to the side wall of the friction plate; the first end of the second universal joint is threadedly connected to the acting end of the displacement sensor, a second nut is threadedly connected to the first end of the first universal joint, and a fourth nut is threadedly connected to the first end of the second universal joint.

[0022] Preferably, an alarm module and a processor are provided in the PLC. The signal output end of the displacement sensor is connected to the signal input end of the processor, and the signal output end of the processor is connected to the signal input end of the alarm module.

[0023] The beneficial effects of the present invention are as follows:

[0024] The device uses two sets of universal heads and positioning grooves of the base to convert the slip of the friction device into linear displacement. It has a simple structure and ingenious design. At the same time, the use of universal heads and double-headed screws makes installation more convenient. The capacitive sensor module is used to convert the displacement into communication volume. Only multiple sets of settings are required to complete the displacement signal acquisition of all guide vanes, and the signal acquisition and fault location are completed in combination with the acquisition PLC; the use of the capacitive sensor module for guide vane displacement monitoring and misalignment positioning is more accurate. At the same time, the early warning value can be set in combination with the PLC, and the specific position of the misaligned guide vane can be clearly determined based on the alarm data; the device can be used as a guide vane misalignment detection and positioning alarm to greatly improve the stability of equipment operation and rapid positioning capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a working status diagram of this application;

[0026] Figure 2 This is a schematic diagram of the structure of this application;

[0027] Figure 3 It is a structural schematic diagram of the base in this application;

[0028] Figure 4 It is a schematic diagram of the structure of the connecting member in this application;

[0029] Figure 5 This is a schematic diagram of the structure of the first mounting base in this application;

[0030] Figure 6 Schematic diagram of the structure of the reflective scale in this application;

[0031] Figure 7 This is a schematic diagram of the structure of the second mounting base in this application;

[0032] Numbers in the figure: 1. friction plate; 2. crank arm; 3. base; 31. slide groove; 32. wire outlet hole; 33. first mounting plate; 4. scale seat; 41. first mounting seat; 42. reflective scale; 43. capacitive sensor; 5. connector; 51. double-headed screw; 52. first universal head; 53. first nut; 54. second nut; 55. second universal head; 56. third nut; 57. fourth nut; 6. second mounting plate; 61. second mounting seat; 7. PLC. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0035] 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.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0037] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" 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 an indirect connection 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.

[0039] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] like Figure 1 As shown, a device for detecting and positioning misalignment of guide vanes of a water turbine comprises:

[0041] Connecting member 5; a first end of the connecting member 5 is connected to the side wall of the friction plate 1;

[0042] The displacement sensor is mounted on the side wall of the crank arm 2; the second end of the connecting member 5 is connected to the action end of the displacement sensor;

[0043] PLC7; the displacement sensor is electrically connected to PLC7. An alarm module and a processor are provided in PLC7, the signal output end of the displacement sensor is connected to the signal input end of the processor, and the signal output end of the processor is connected to the signal input end of the alarm module.

[0044] During operation, when the friction device controlling the guide vane slips, this action is collected by the displacement sensor, and the displacement sensor sends the collected signal to the processor in PLC7. The processor has a preset alarm threshold. When the data exceeds the alarm threshold, the processor controls the alarm module to alarm.

[0045] like Figure 3 and 6 As shown, the displacement sensor includes a capacitive grating sensor 43 and a reflective grating scale 42, and the capacitive grating sensor 43 and the reflective grating scale 42 are connected in cooperation.

[0046] like Figure 3 and 6 As shown, the turbine guide vane misalignment detection and positioning alarm device also includes a base 3 and a scale seat 4. The capacitive scale sensor 43 is mounted on the base 3, the reflective scale 42 is mounted on the scale seat 4, and the second end of the connecting member 5 is connected to the scale seat 4. A mounting groove is provided at the bottom of the scale seat 4, and the reflective scale 42 is embedded and installed in the mounting groove and fixed by glue.

[0047] like Figure 2 and 3 As shown, a slide groove 31 is provided in the base 3, the scale seat 4 is slidably installed in the slide groove 31, and the capacitive grid sensor 43 is installed at the bottom of the slide groove 31 through a plurality of screws.

[0048] like Figure 3 As shown, a wire outlet hole 32 is provided at the bottom of the slide groove 31 in the base 3, and the signal line of the capacitive barrier sensor 43 passes through the wire outlet hole 32 and is connected to the PLC 7.

[0049] like Figure 1 and 4 As shown, the connecting member 5 comprises:

[0050] A first universal head 52; a first end of the first universal head 52 is connected to the side wall of the friction plate 1;

[0051] The second universal head 55; the first end of the second universal head 55 is connected to the action end of the displacement sensor; the second end of the first universal head 52 is connected to the second end of the second universal head 55.

[0052] The combined action of the first universal head 52 and the second universal head 55 converts the slippage generated by the friction device controlling the rejection guide vane into a linear displacement, and acts on the capacitive sensor 43 .

[0053] like Figure 4As shown, the connecting member 5 also includes a double-headed screw 51 , the second end of the first universal head 52 is threadedly connected to the first end of the double-headed screw 51 , and the second end of the second universal head 55 is threadedly connected to the second end of the double-headed screw 51 .

[0054] The double-headed screw 51 is used to adjust the distance between the first universal head 52 and the second universal head 55, as well as the opening direction of the first universal head 52 and the second universal head 55, so as to adapt to different sizes of the present application and various working conditions.

[0055] like Figure 4 As shown, a first nut 53 is threadedly connected to the first end of the double-headed screw 51 , and a third nut 56 is threadedly connected to the second end of the double-headed screw 51 .

[0056] like Figure 4 As shown, the first end of the first universal head 52 and the first end of the second universal head 55 are both a screw, and the first end of the first universal head 52 is threadedly connected to the side wall of the friction plate 1; the first end of the second universal head 55 is threadedly connected to the active end of the displacement sensor, the first end of the first universal head 52 is threadedly connected to the second nut 54, and the first end of the second universal head 55 is threadedly connected to the fourth nut 57.

[0057] The first nut 53 , the second nut 54 , the third nut 56 , and the fourth nut 57 all play a role of limiting.

[0058] like Figure 1 and 3 As shown, the present application also includes a first mounting plate 33, the first mounting plate 33 is mounted on the base 3, the first mounting plate 33 is fixed to the crank arm 2 by bolts, and the base 3 is fixed to the crank arm 2 by the first mounting plate 33. In addition, as Figure 5 As shown, a first mounting seat 41 is provided on the top of the scale seat 4 , and a first end of the second universal head 55 is threadedly connected to the first mounting seat 41 .

[0059] like Figure 2 As shown, the present application also includes a second mounting plate, which is fixed to the side wall of the friction plate 1 by bolts. Figure 7 As shown, a second mounting seat 61 is provided on the second mounting plate, and the first end of the first universal head 52 is threadedly connected to the second mounting seat 61. The threaded connection is designed to facilitate the disassembly and replacement of related components.

[0060] How this application works overall:

[0061] The capacitive barrier sensor 43 is a capacitive digital sensor that can measure displacement based on the variable area working principle. When the friction device controlling the guide vane to be rejected slips, the fixed block will move with it, and the universal head on the connecting rod cooperates with the positioning groove of the base 3 to convert the slip into a linear displacement, and the displacement is collected by the capacitive barrier sensor 43 module and converted into a serial communication signal, which is output to the collection PLC7 through the two signal lines 485+ / 485-. The address of each capacitive barrier sensor 43 module is set by PLC7, and its address corresponds to the guide vane number on site one by one. When the displacement signal collected by PLC7 is greater than a certain set value (according to the actual setting on site), it is determined that the guide vane is misaligned or about to be misaligned, thereby realizing fault location or early warning. This application adopts a capacitive barrier sensor 43 module with serial communication to convert the displacement into communication volume. Only two signal lines 485+ / 485- are required to complete the displacement signal collection of all guide vanes, and the signal collection and fault location are completed in combination with the collection PLC7. The capacitive sensor 43 has the outstanding characteristics of small size, simple structure, high resolution and accuracy, fast measurement speed, low power consumption, low cost, and low requirements for the use environment. The use of the capacitive sensor 43 module for guide vane displacement monitoring and misalignment positioning is more accurate. At the same time, the early warning value can be set in combination with PLC7, and the specific position of the misaligned guide vane can be clearly determined based on the alarm data. The device can be used as a guide vane misalignment detection and positioning alarm to greatly improve the stability of equipment operation and rapid positioning capability.

[0062] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A device for detecting and positioning misalignment of guide vanes of a water turbine, It is characterized in that include: Connectors; The first end of the connecting member is connected to the side wall of the friction plate; Connectors include: A first universal head; a first end of the first universal head is connected to the side wall of the friction plate; A second universal head; a first end of the second universal head is connected to the action end of the displacement sensor; a second end of the first universal head is connected to a second end of the second universal head; A double-headed screw; the second end of the first universal head is threadedly connected to the first end of the double-headed screw, and the second end of the second universal head is threadedly connected to the second end of the double-headed screw; a first nut is threadedly connected to the first end of the double-headed screw, and a third nut is threadedly connected to the second end of the double-headed screw; the first end of the first universal head and the first end of the second universal head are both a screw, and the first end of the first universal head is threadedly connected to the side wall of the friction plate; the first end of the second universal head is threadedly connected to the action end of the displacement sensor, the first end of the first universal head is threadedly connected to the second nut, and the first end of the second universal head is threadedly connected to the fourth nut; The displacement sensor is mounted on the side wall of the crank arm; the second end of the connecting member is connected to the action end of the displacement sensor; PLC; the displacement sensor is electrically connected to the PLC.

2. A turbine guide vane misalignment detection and positioning alarm device according to claim 1, It is characterized in that The displacement sensor comprises a capacitive grating sensor and a reflective grating scale, and the capacitive grating sensor and the reflective grating scale are connected in cooperation.

3. A turbine guide vane misalignment detection and positioning alarm device according to claim 2, It is characterized in that The turbine guide vane misalignment detection and positioning alarm device also includes a base and a scale seat. The capacitive grid sensor is installed on the base, the reflective scale is installed on the scale seat, and the second end of the connecting piece is connected to the scale seat.

4. A turbine guide vane misalignment detection and positioning alarm device according to claim 3, It is characterized in that A slide groove is arranged in the base, the scale seat is slidably installed in the slide groove, and the capacitive grid sensor is installed at the bottom of the slide groove.

5. A turbine guide vane misalignment detection and positioning alarm device according to claim 4, It is characterized in that A wire outlet hole is arranged at the bottom of the slide groove in the base, and the signal wire of the capacitive barrier sensor passes through the wire outlet hole.

6. A turbine guide vane misalignment detection and positioning alarm device according to claim 1, It is characterized in that An alarm module and a processor are arranged in the PLC. The signal output end of the displacement sensor is connected to the signal input end of the processor, and the signal output end of the processor is connected to the signal input end of the alarm module.

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