Vacuum circuit breaker stroke on-line monitoring device

Abstract

The utility model relates to an online stroke monitoring device for a vacuum circuit breaker. The online stroke monitoring device comprises a non-contact magnetic grid sensor, a magnetic head bracket and a magnetic ring fixing seat, the magnetic ring fixing seat is fixedly arranged at the end part of the circuit breaker rotating main shaft; the magnetic head bracket is fixedly arranged on a side plate of a rotating main shaft of the circuit breaker; the non-contact magnetic grid sensor comprises a magnetic grid and a magnetic head; the magnetic grid is annular and is fixedly arranged on the magnetic ring fixing seat in a sleeving manner; the magnetic head is fixedly arranged on the magnetic head bracket and is arranged corresponding to the magnetic grid at an interval of 2-5mm; the non-contact type magnetic grid sensor is adopted, the magnetic grid and the magnetic head are arranged on the end portion of the rotating main shaft and the side plate of the rotating main shaft respectively, the magnetic grid and the magnetic head do not make contact with each other and are arranged in a staggered mode, and the non-contact type magnetic grid sensor has the advantages of being simple and compact in structure, small in size, long in service life, convenient to install and the like.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to an online travel monitoring device for a vacuum circuit breaker. Background Art

[0002] Vacuum circuit breakers perform the crucial high-voltage on / off control function of switchgear. Key mechanical parameters of the vacuum circuit breaker's opening and closing processes, such as speed, opening distance, and overtravel, provide a direct reflection of the breaker's status and are central to online monitoring. Obtaining these parameters requires online monitoring of the breaker's opening and closing strokes. Therefore, online monitoring of stroke is crucial for online monitoring of the mechanical characteristics of vacuum circuit breakers.

[0003] During the opening and closing process of the vacuum circuit breaker, the rotating main shaft is more convenient to obtain the opening and closing stroke curve from the perspective of installation and movement trajectory monitoring compared to other moving structural parts.

[0004] Conventional encoders for monitoring rotating spindles are generally shaft-type and sleeve-type, which are directly or via adapters mounted on the spindle end face and fixed with a bracket. However, during the opening and closing process of the circuit breaker, the movement of the rotating spindle is not a simple circular motion, and there are jitters, eccentricity, etc. The encoder is easily damaged by direct contact with the circuit breaker spindle.

[0005] Although non-contact circuit breaker travel monitoring devices have appeared on the market, such as a circuit breaker travel monitoring device previously applied for by this unit with application number CN202211259307.4, which includes a pad, a non-metallic base, a bracket and a magnetic sensor; however, since the pad, non-metallic base and magnetic sensor are arranged at the end of the circuit breaker main shaft and are arranged in sequence from the inside to the outside along the axis of the circuit breaker main shaft, the overall size of the monitoring device is large and is not suitable for occasions where the reserved space is limited. Utility Model Content

[0006] The utility model aims to provide an online monitoring device for the travel of a vacuum circuit breaker in order to overcome the deficiencies of the prior art.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: an online monitoring device for the travel of a vacuum circuit breaker, comprising a non-contact magnetic grid sensor, a magnetic head bracket and a magnetic ring fixing seat;

[0008] The magnetic ring fixing seat is fixedly installed on the end of the rotating main shaft of the circuit breaker;

[0009] The magnetic head bracket is fixedly mounted on the side plate of the rotating main shaft of the circuit breaker;

[0010] The non-contact magnetic grating sensor includes a magnetic grating and a magnetic head; the magnetic grating is annular and fixedly sleeved on a magnetic ring fixing seat; the magnetic head is fixedly installed on a magnetic head bracket and is placed corresponding to the magnetic grating at an interval of 2-5 mm.

[0011] Preferably, a mounting hole corresponding to the shape of the rotating main shaft of the circuit breaker is provided in the middle of the magnetic ring fixing seat; the magnetic ring fixing seat is stepped, including a large end and a small end; the magnetic grid fixing sleeve is arranged on the large end; at least one threaded hole placed perpendicular to the mounting hole is provided on the small end; a screw is threadedly installed on the threaded hole, and the screw is pressed against the surface of the rotating main shaft of the circuit breaker to fix the magnetic ring fixing seat.

[0012] Preferably, the magnetic grid and the large end are fixed by gluing.

[0013] Preferably, the glue is epoxy resin glue.

[0014] Preferably, the magnetic head has a built-in LED indicator light.

[0015] Preferably, two countersunk waist holes are provided on the magnetic head.

[0016] Preferably, the head bracket includes a U-shaped bracket body and mounting parts respectively arranged at both ends of the bracket body; the bracket body is provided with connecting holes corresponding to two countersunk waist holes; the mounting part is provided with a long hole; the magnetic grid and the magnetic head are placed at intervals along the length direction of the long hole.

[0017] Preferably, the bracket body and the mounting portion are not in the same plane and are connected via a connecting portion; the side surfaces of the bracket body, the connecting portion and the mounting portion are Z-shaped.

[0018] Preferably, the magnetic ring fixing seat and the magnetic head bracket are both made of metal materials.

[0019] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0020] The utility model adopts a non-contact magnetic grating sensor, and the magnetic grating and the magnetic head are respectively arranged on the end of the rotating spindle and the side plate of the rotating spindle. Not only do the two do not contact each other, but also achieve staggered placement. It has the advantages of simple and compact structure, small size, long service life, and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution of the utility model is further described below with reference to the accompanying drawings:

[0022] Attachment Figure 1 This is a schematic diagram of the installation of the online monitoring device for the travel of a vacuum circuit breaker according to the present invention;

[0023] Attachment Figure 2This is an exploded view of the vacuum circuit breaker stroke online monitoring device according to the present invention;

[0024] Attachment Figure 3 This is a schematic diagram of the structure of the magnetic ring fixing seat in the utility model;

[0025] Attachment Figure 4 It is a structural schematic diagram of the magnetic head in the utility model;

[0026] Attachment Figure 5 This is a structural diagram of the magnetic head bracket in the utility model.

[0027] Among them: 1. Magnetic grid; 2. Magnetic head; 21. LED indicator light; 22. Countersunk waist hole; 3. Magnetic ring fixing seat; 31. Mounting hole; 32. Large end; 33. Small end; 34. Threaded hole; 4. Magnetic head bracket; 41. Bracket body; 42. Mounting part; 43. Connecting hole; 44. Long hole; 45. Connecting part; 5. Rotating spindle; 6. Rotating spindle side plate; 7. Hexagon socket head screw with cylindrical head; 8. Hexagon socket head screw with cylindrical head. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Attachment Figure 1-5 The vacuum circuit breaker stroke online monitoring device of the present invention comprises a non-contact magnetic grid sensor, a magnetic head bracket 4 and a magnetic ring fixing seat 3;

[0030] The magnetic ring fixing seat 3 is fixedly installed on the end of the circuit breaker rotating main shaft 5;

[0031] The magnetic head support 4 is fixedly mounted on the side plate 6 of the rotating spindle of the circuit breaker;

[0032] The non-contact magnetic grating sensor includes a magnetic grating 1 and a magnetic head 2; the magnetic grating 1 is annular and fixedly sleeved on a magnetic ring fixing seat 3; the magnetic head 2 is fixedly mounted on a magnetic head bracket 4 and is placed corresponding to the magnetic grating 1 at a distance of 2-5 mm.

[0033] The present invention is based on a non-contact magnetic grid sensor to monitor the rotating main shaft 5 of the vacuum circuit breaker, obtain the angular displacement stroke information during the opening and closing process of the vacuum circuit breaker, and then extract the mechanical characteristic related parameters of the vacuum circuit breaker with the rotation angle as the analysis object.

[0034] If the obtained angular displacement information is multiplied by the rotation radius and transmission ratio of the rotating main shaft 5, the linear travel information of the circuit breaker opening and closing process can be obtained, and then the mechanical characteristic related parameters of the vacuum circuit breaker with the movement distance as the analysis object can be extracted.

[0035] Specifically, the magnetic grid sensor is realized by utilizing the change in the magnetic field generated by the magnetic grid. When an object approaches the magnetic grid, the magnetic field distribution of the magnetic grid will be changed, thereby changing the strength and direction of the magnetic field. The rotation angle and rotation direction of the rotating main shaft 5 during the opening and closing process are detected by the magnetic field detector in the magnetic grid sensor through the magnetic grid and converted into corresponding electrical signals. By processing and analyzing these electrical signals, the physical quantity to be measured is obtained.

[0036] Furthermore, the magnetic grid 1 is a ring-shaped magnetic grid with an inner diameter of 43 mm, an outer diameter of 50.8 mm, and a thickness of 10 mm.

[0037] Further, if Figure 3 As shown, a mounting hole 31 corresponding to the shape of the circuit breaker rotating main shaft 5 is provided in the middle of the magnetic ring fixing base 3; the magnetic ring fixing base 3 is stepped, including a large end 32 and a small end 33; the large end 32 has an outer diameter of 43 mm, which is consistent with the inner diameter of the circular magnetic grid 1, and a thickness of 10 mm; the small end 33 has two threaded holes 34 opposite to each other and placed perpendicular to the mounting hole 31; screws are threadedly installed in the threaded holes 34, which are pressed against the tangent plane of the circuit breaker rotating main shaft 5 to fix the magnetic ring fixing base 3.

[0038] Further, if Figure 1 As shown, the annular magnetic grid 1 is bonded to the outer surface of the large end 32 of the magnetic ring fixing seat 3 using epoxy resin glue.

[0039] Further, if Figure 4 As shown, the magnetic head 2 is a conversion device for magneto-electric conversion, which converts the magnetization signal recorded on the magnetic grid 1 into an electrical signal and transmits it to the detection circuit to realize the measurement of data such as rotation angle, speed, and displacement. The magnetic head 2 has a built-in LED indicator 21, which can identify the working power supply and the magnetic grid 1 signal. The green light is normal and the red light is abnormal. At the same time, the magnetic head 2 and the magnetic grid 1 are read through non-contact installation, and it has two mounting countersunk waist round holes 22 with an installation distance of 2-5mm. The magnetic head 2 senses the change of the magnetic field during the rotation of the annular magnetic grid 1 along the axis of the rotating spindle 5 and converts this magnetic field change into an analog signal or a digital signal output.

[0040] Further, if Figure 5 As shown, the head bracket 4 includes a U-shaped bracket body 41 and mounting portions 42 respectively arranged at both ends of the bracket body 41; the bracket body 41 is provided with connecting holes 43 corresponding to two countersunk waist holes 22, and the distance between the magnetic head 2 and the magnetic grid 1 can be adjusted according to the countersunk waist holes 22 of the magnetic head 2; the mounting portion 42 is provided with a long hole 44; the magnetic grid 1 and the magnetic head 2 are spaced apart along the length direction of the long hole 44, and the distance between the magnetic head 2 and the magnetic grid 1 can be further adjusted.

[0041] Further, if Figure 5 As shown, the bracket body 41 and the mounting portion 42 are not in the same plane and are connected by a connecting portion 45; the side surfaces of the bracket body 41, the connecting portion 45 and the mounting portion 42 are Z-shaped.

[0042] Furthermore, the magnetic ring fixing seat 3 and the magnetic head support 4 are both made of metal materials, preferably aluminum alloy.

[0043] The installation steps are as follows:

[0044] 1. Use epoxy resin glue to glue the annular magnetic grid 1 to the outer surface of the large end 32 of the magnetic ring fixing base 3. After the glue is completely cured, assemble the magnetic ring fixing base 3 with the bonded magnetic grid 1 to the predetermined position of the circuit breaker rotating main shaft 5 and fix it with two M4 screws respectively;

[0045] 2. Assemble the magnetic head 2 on the magnetic head bracket 4 by threading it with two M3*12 cylindrical hexagon socket screws 7 and the connection hole 43, and make the triangular arrow on the surface of the magnetic head 2 point to the direction of the magnetic ring axis;

[0046] 3. Fasten the magnetic head bracket 4 with the magnetic head 2 installed on the side plate 6 of the circuit breaker rotating spindle with the M6*12 hexagon socket head screw 8 through the long hole 44, then use a feeler gauge to adjust the locking screws between the magnetic head 2 and the magnetic ring so that the magnetic moment is maintained at 2-5mm, preferably 2mm, and finally tighten the screws to complete the installation.

[0047] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. A vacuum circuit breaker travel online monitoring device, characterized by: It includes a non-contact magnetic grating sensor, a magnetic head bracket and a magnetic ring fixing seat; The magnetic ring fixing seat is fixedly installed on the end of the rotating main shaft of the circuit breaker; The magnetic head bracket is fixedly mounted on the side plate of the rotating main shaft of the circuit breaker; The non-contact magnetic grating sensor includes a magnetic grating and a magnetic head; the magnetic grating is annular and fixedly sleeved on a magnetic ring fixing seat; the magnetic head is fixedly installed on a magnetic head bracket and is placed corresponding to the magnetic grating at an interval of 2-5 mm.

2. The vacuum circuit breaker stroke online monitoring device according to claim 1, characterized in that: A mounting hole corresponding to the shape of the circuit breaker's rotating main shaft is provided in the middle of the magnetic ring fixing seat; the magnetic ring fixing seat is stepped, including a large end and a small end; the magnetic grid fixing sleeve is arranged on the large end; at least one threaded hole placed perpendicular to the mounting hole is provided on the small end; a screw is threadedly installed on the threaded hole, and the screw is pressed against the surface of the circuit breaker's rotating main shaft to fix the magnetic ring fixing seat.

3. The vacuum circuit breaker stroke online monitoring device according to claim 2, characterized in that: The magnetic grid and the large end are bonded and fixed by glue.

4. The vacuum circuit breaker stroke online monitoring device according to claim 3, characterized in that: The glue is epoxy resin glue.

5. The device for online monitoring of the travel of a vacuum circuit breaker according to any one of claims 1 to 4, characterized in that: The magnetic head is provided with a built-in LED indicator light.

6. The vacuum circuit breaker stroke online monitoring device according to claim 5, characterized in that: The magnetic head is provided with two countersunk waist circular holes.

7. The device for online monitoring of the travel of a vacuum circuit breaker according to claim 6, characterized in that: The magnetic head bracket includes a U-shaped bracket body and mounting parts respectively arranged at both ends of the bracket body; the bracket body is provided with connecting holes corresponding to two countersunk waist holes; the mounting part is provided with a long hole; the magnetic grid and the magnetic head are placed at intervals along the length direction of the long hole.

8. The device for online monitoring of the travel of a vacuum circuit breaker according to claim 7, characterized in that: The bracket body and the mounting portion are not in the same plane and are connected via a connecting portion; the side surfaces of the bracket body, the connecting portion and the mounting portion are Z-shaped.

9. The vacuum circuit breaker stroke online monitoring device according to claim 1, characterized in that: The magnetic ring fixing seat and the magnetic head bracket are both made of metal materials.

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