Contact assembly and disconnecting link

Abstract

The invention relates to the field of disconnecting links, and discloses a contact assembly and a disconnecting link, the contact assembly comprises a touch piece, the touch piece comprises a static contact, a moving contact knife body and a driving shaft, the moving contact knife body is arranged on the outer side of the driving shaft, and the driving shaft is used for adjusting the moving contact knife body to make contact with the static contact. And the static contact is arranged to be T-shaped. According to the method, the traditional single disconnecting link closing action is disassembled into two independent stages: firstly, the contact of a moving contact and a static contact of a disconnecting link is carried out, and then the pressurization of the contacts is carried out. The sectional operation not only can ensure that the switch equipment obtains enough contact pressure when being closed so as to ensure the dynamic thermal stability, but also can obviously reduce the mechanical wear generated in the breaking process so as to greatly prolong the service life of the disconnecting link.

Description

Technical Field

[0001] The present invention relates to the field of disconnect switches, and in particular to a contact component and a disconnect switch. Background Art

[0002] In the field of power switchgear, dynamic and thermal stability is one of the important indicators to measure the performance of equipment. The so-called dynamic thermal stability refers to the performance of switchgear when it withstands the rated peak withstand current and the rated short-time withstand current. When a short-circuit fault occurs in the power system, due to the difference in the action time of the relay protection device, the switchgear needs to withstand a huge short-circuit current within the specified rated short-circuit duration and maintain normal operation without abnormal conditions. Under the action of the short-circuit impact current, a strong electrodynamic force will be generated at the moving and static contact parts of the disconnect switch of the switchgear, thus causing a repulsive force. If the equipment cannot effectively resist this repulsive force, the moving and static contacts may separate, and then a breakdown arc will be generated, resulting in contact ablation or welding, and finally the opening function of the switchgear will fail. Therefore, good dynamic and thermal stability performance is crucial for ensuring the safe and reliable operation of switchgear.

[0003] In the design of switchgear, the core of achieving dynamic and thermal stability lies in resisting the electrodynamic force generated by the short-circuit current. This usually needs to be achieved by increasing the pressure between the moving and static contacts. However, too high contact pressure will cause greater mechanical wear during the closing process of the disconnect switch, thus significantly reducing the service life of the disconnect switch. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that too high contact pressure will cause greater mechanical wear during the closing process of the disconnect switch, thus significantly reducing the service life of the disconnect switch.

[0005] The above technical problem is solved by the following technical solutions: The present invention provides a contact component, including:

[0006] A contact member, the contact member includes a static contact, a moving contact blade body, and a driving shaft, the moving contact blade body is arranged outside the driving shaft, the driving shaft is used to adjust the contact between the moving contact blade body and the static contact, and the static contact is arranged in a T shape;

[0007] A triggering member, the triggering member is composed of a shaft body and a pressing rod, the pressing rod is installed outside the shaft body through a bolt, and the shaft body is arranged outside the driving shaft;

[0008] A pressing member, the pressing member includes two connecting rods, a pressing block installed outside the two connecting rods through a round hole, and a wedge block installed outside the two groups of connecting rods through a cavity, and the two connecting rods are installed at one end of the moving contact blade body.

[0009] In a preferred embodiment of the contact assembly of the present invention: the moving contact blade body is composed of a blade shaft and two groups of actuating blade heads, and positioning holes are formed on both sides of the blade shaft, and the two groups of actuating blade heads are installed on the outside of the blade shaft through bolts.

[0010] In a preferred embodiment of the contact assembly of the present invention: the drive shaft includes a circular shaft, a groove formed on the outside of the circular shaft, and a torsion spring arranged on the outside of the circular shaft;

[0011] Wherein, one end of the torsion spring is fixedly connected inside the positioning hole, and the other end is arranged inside the groove.

[0012] In a preferred embodiment of the contact assembly of the present invention: the actuating members are provided in two groups, and the two groups of actuating members are respectively located at both ends of the circular shaft, and the shaft body is installed on the outside of the circular shaft through keyway fit;

[0013] Wherein, the blade shaft is installed on the outside of the circular shaft through keyway fit.

[0014] In a preferred embodiment of the contact assembly of the present invention: nuts are threadedly connected to both ends of the two connecting rods, a limiting sleeve is arranged in the middle of the two connecting rods, and disc springs are arranged on the outside of the two connecting rods.

[0015] In a preferred embodiment of the contact assembly of the present invention: the pressing block includes a guide groove formed on the inner side of the pressing block and a spring fixedly connected to the inner side of the pressing block.

[0016] In a preferred embodiment of the contact assembly of the present invention: a slider is fixedly connected to the inclined surface of the wedge block, the slider is located inside the guide groove, and the guide groove slides along the inside of the guide groove.

[0017] In a preferred embodiment of the contact assembly of the present invention: the nuts are used to limit and install the pressing block and the wedge block on the outside of the two connecting rods, the disc springs are located between the pressing block and the actuating blade heads, and both ends of the spring are respectively connected to the pressing block and the wedge block.

[0018] The present invention also provides a knife switch, including the contact assembly as described above, and further including,

[0019] A mounting member, the mounting member includes two groups of side plates and a rotating shaft rotatably connected to the two groups of side plates, and one end of the rotating shaft is connected to a drive source;

[0020] A fitting member, the fitting member includes two groups of connecting plates and a mounting plate.

[0021] In a preferred embodiment of the knife switch of the present invention: the two sets of the connecting plates are used to install and connect the two sets of the side plates through bolts, the mounting plate is installed between the two sets of the side plates through bolts, and the static contact is installed at the top of the mounting plate through bolts, and the round shaft is installed outside the rotating shaft through a keyway.

[0022] The beneficial effects of the present invention are as follows: the function of the segmented closing of the knife switch can be realized only by the rotation of the round shaft. This design disassembles the traditional single closing action of the knife switch into two independent stages: first is the contact of the moving and static contacts of the knife switch, and then is the pressurization of the contacts. This segmented operation can not only ensure that the switchgear obtains sufficient contact pressure during closing, so as to ensure the dynamic and thermal stability, but also significantly reduce the mechanical wear generated during the breaking process, thereby greatly improving the service life of the knife switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention.

[0024] Figure 1 Shows the overall schematic diagram of the present invention.

[0025] Figure 2 Shows the partial top view schematic diagram of the present invention.

[0026] Figure 3 Shows the overall three-dimensional schematic diagram of the contact assembly of the present invention.

[0027] Figure 4 Shows the top view schematic diagram of the contact assembly of the present invention.

[0028] Figure 5 Shows the front view schematic diagram of the actuating member of the present invention.

[0029] Figure 6 Shows the partial front view schematic diagram of the present invention.

[0030] Figure 7 Shows the front view schematic diagram of the contact member of the present invention.

[0031] Figure 8 Shows the overall schematic diagram of the drive shaft of the present invention.

[0032] Figure 9 Shows the partial exploded schematic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the specific embodiments and the drawings.

[0034] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may vary according to the intention of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be construed as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0035] Referring to Figures 1 to 5 , this embodiment provides a contact component, including,

[0036] A contact member 1, the contact member 1 includes a static contact 11, a moving contact blade body 12, and a driving shaft 13. The moving contact blade body 12 is arranged outside the driving shaft 13. The driving shaft 13 is used to adjust the contact between the moving contact blade body 12 and the static contact 11. The static contact 11 is arranged in a T shape;

[0037] A triggering member 2, the triggering member 2 is composed of a shaft body 21 and a pressing rod 22. The pressing rod 22 is installed outside the shaft body 21 through a bolt. The shaft body 21 is arranged outside the driving shaft 13;

[0038] A pressing member 3, the pressing member 3 includes two connecting rods 31, a pressing block 32 installed outside the two connecting rods 31 through a round hole, and a wedge block 33 installed outside the two groups of connecting rods 31 through a cavity. The two connecting rods 31 are installed at one end of the moving contact blade body 12.

[0039] When the driving shaft 13 rotates counterclockwise, it will drive the moving contact blade body 12 to rotate synchronously until the moving contact blade body 12 contacts the static contact 11. On the contrary, when the driving shaft 13 rotates clockwise, it will drive the moving contact blade body 12 to separate from the static contact 11.

[0040] As an embodiment provided in the present application, as Figures 2 to 8 , the moving contact blade body 12 is composed of a blade shaft 121 and two groups of triggering blade heads 122. Positioning holes 123 are opened on both sides of the blade shaft 121. The two groups of triggering blade heads 122 are installed outside the blade shaft 121 through bolts.

[0041] The driving shaft 13 includes a circular shaft 131, a groove 132 opened on the outside of the circular shaft 131, and a torsion spring 133 arranged on the outside of the circular shaft 131;

[0042] Among them, one end of the torsion spring 133 is fixedly connected inside the positioning hole 123, and the other end is arranged inside the groove 132.

[0043] Two groups of triggering members 2 are arranged, and the two groups of triggering members 2 are respectively located at both ends of the circular shaft 131. The shaft body 21 is installed outside the circular shaft 131 through keyway fit;

[0044] Among them, the tool shaft 121 is installed outside the circular shaft 131 through keyway fit.

[0045] When the circular shaft 131 is driven to rotate counterclockwise, the circular shaft 131 drives the pressure rod 22 to rotate synchronously through the shaft body 21. At the same time, since the torsion spring 133 abuts against the groove 132 of the circular shaft 131, the circular shaft 131 will transmit power through the torsion spring 133, thereby driving the tool shaft 121 to rotate, and finally causing the trigger tool head 122 at one end of the tool shaft 121 to rotate until the trigger tool head 122 is in full contact with the static contact 11.

[0046] When the circular shaft 131 rotates counterclockwise until the trigger tool head 122 contacts the static contact 11, the trigger tool head 122 stops rotating due to the restriction of the static contact 11. At this time, when the circular shaft 131 continues to rotate, the torsion spring 133 will be further compressed, while the pressure rod 22 continues to rotate with the drive shaft 301.

[0047] It should be particularly noted that before the trigger tool head 122 moves towards the static contact 11 side, the torsion spring 133 itself has a certain initial pre-torsion force after installation. This pre-torsion force enables the circular shaft 131 to drive the trigger tool head 122 to rotate synchronously through the torsion spring 133 during the rotation process.

[0048] As an embodiment provided in the present application, as Figures 2 to 9 , nuts 311 are threadedly connected to both ends of the two connecting rods 31, a limiting sleeve 312 is provided at the middle ends of the two connecting rods 31, and disc springs 313 are provided outside the two connecting rods 31.

[0049] The pressing block 32 includes a guide groove 321 opened on the inner side of the pressing block 32 and a spring 322 fixedly connected to the inner side of the pressing block 32.

[0050] A slider 331 is fixedly connected to the inclined surface of the wedge block 33. The slider 331 is located inside the guide groove 321 and slides along the inside of the guide groove 321.

[0051] The nuts 311 are used to limit the installation of the pressing block 32 and the wedge block 33 outside the two connecting rods 31. The disc springs 313 are located between the pressing block 32 and the trigger tool head 122, and both ends of the spring 322 are respectively connected to the pressing block 32 and the wedge block 33.

[0052] When the circular shaft 131 continues to rotate by a certain angle, the pressure rod 22 will contact the wedge block 33 and push the wedge block 33 to move along the radial direction of the connecting rod 31. Since the wedge block 33 and the pressing block 32 cooperate with each other through the groove 132 and the slider 331, the pressing block 32 will move along the axial direction of the connecting rod 31 as the wedge block 33 moves, thereby increasing the compression amount of the disc spring 313 and thus increasing the contact pressure between the trigger tool head 122 and the static contact 11.

[0053] During the opening process of the disconnecting switch, the circular shaft 131 rotates clockwise. At this time, the pressure rod 22 and the wedge block 33 are disengaged from contact first. The pressure block 32 moves along the axial direction of the connecting rod 31 under the elastic force of the disc spring 313 until it returns to the initial position. The wedge block 33 moves along the radial direction of the connecting rod 31 under the elastic force of the spring 322 and the acting force of the pressure block 32 until it returns to the initial position. At the same time, the contact pressure between the moving contact head 122 and the static contact 11 will gradually decrease to the initial pressure. As the circular shaft 131 continues to rotate clockwise, the circular shaft 131 drives the moving contact head 122 to rotate through the torsion spring 133, so that it is completely disengaged from the static contact 11.

[0054] Through the above design, the function of the sectional closing of the disconnecting switch can be realized only by the rotation of the circular shaft 131. This design disassembles the traditional single closing action of the disconnecting switch into two independent stages: first is the contact of the moving and static contacts of the disconnecting switch, and then is the pressurization of the contacts. This sectional operation can not only ensure that the switching device obtains sufficient contact pressure during closing, so as to ensure the dynamic and thermal stability, but also significantly reduce the mechanical wear generated during the opening process, thus greatly improving the service life of the disconnecting switch.

[0055] As an embodiment provided in this application, such as Figure 1 、 Figure 2 , a disconnecting switch, including a contact assembly, further includes,

[0056] The mounting member 4 includes two groups of side plates 41 and a rotating shaft 42 rotatably connected to the two groups of side plates 41. One end of the rotating shaft 42 is connected to the driving source;

[0057] The fitting member 5 includes two groups of connecting plates 51 and a mounting plate 52.

[0058] The two groups of connecting plates 51 are installed and connected to the two groups of side plates 41 through bolts. The mounting plate 52 is installed between the two groups of side plates 41 through bolts, and the static contact 11 is installed at the top of the mounting plate 52 through bolts. The circular shaft 131 is installed outside the rotating shaft 42 through a keyway.

[0059] By driving the rotating shaft 42 by the driving source, the rotation of the circular shaft 131 can be realized. At the same time, through the assembly of the side plates 41 and the connecting plates 51, the overall stability of the device can be ensured, and local replacement can be carried out when some components are damaged, so as to reduce the later maintenance cost.

[0060] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A contact component, characterized in that: Comprising, A contact member (1), the contact member (1) includes a stationary contact (11), a movable contact blade body (12) and a drive shaft (13), the movable contact blade body (12) is arranged outside the drive shaft (13), the drive shaft (13) is used to adjust the contact between the movable contact blade body (12) and the stationary contact (11), and the stationary contact (11) is arranged in a T shape; A triggering member (2), the triggering member (2) is composed of a shaft body (21) and a pressing rod (22), the pressing rod (22) is installed outside the shaft body (21) through a bolt, and the shaft body (21) is arranged outside the drive shaft (13); A pressing member (3), the pressing member (3) includes two connecting rods (31), a pressing block (32) installed outside the two connecting rods (31) through a round hole, and a wedge block (33) installed outside the two groups of connecting rods (31) through a cavity, and the two connecting rods (31) are installed at one end of the movable contact blade body (12).

2. The contact component according to claim 1, wherein: The movable contact blade body (12) is composed of a blade shaft (121) and two groups of triggering blade heads (122), and positioning holes (123) are opened on both sides of the blade shaft (121), and the two groups of triggering blade heads (122) are installed outside the blade shaft (121) through bolts.

3. The contact component according to claim 2, wherein: The drive shaft (13) includes a round shaft (131), a groove (132) opened outside the round shaft (131), and a torsion spring (133) arranged outside the round shaft (131); Wherein, one end of the torsion spring (133) is fixedly connected inside the positioning hole (123), and the other end is arranged inside the groove (132).

4. The contact component according to claim 3, characterized in that: Two groups of the triggering members (2) are arranged, and the two groups of the triggering members (2) are respectively located at both ends of the round shaft (131), and the shaft body (21) is installed outside the round shaft (131) through keyway fit; Wherein, the blade shaft (121) is installed outside the round shaft (131) through keyway fit.

5. The contact component according to claim 4, wherein: Nuts (311) are threadedly connected to both ends of the two connecting rods (31), a limiting sleeve (312) is arranged in the middle of the two connecting rods (31), and disc springs (313) are arranged outside the two connecting rods (31).

6. The contact component according to claim 5, wherein: The pressing block (32) includes a guide groove (321) opened inside the pressing block (32), and a spring (322) fixedly connected inside the pressing block (32).

7. The contact component according to claim 6, wherein: A slider (331) is fixedly connected to the inclined surface of the wedge block (33), the slider (331) is located inside the guide groove (321), and the guide groove (321) slides inside the guide groove (321).

8. The contact component according to claim 7, wherein: The nut (311) is used to limit the installation of the pressing block (32) and the wedge block (33) outside the two connecting rods (31), the disc spring (313) is located between the pressing block (32) and the triggering blade head (122), and both ends of the spring (322) are respectively connected to the pressing block (32) and the wedge block (33).

9. A knife switch, characterized in that: Comprising the contact assembly according to any one of claims 3 to 8, further comprising, Mounting member (4), the mounting member (4) includes two sets of side plates (41), and a rotating shaft (42) rotatably connected to the two sets of side plates (41), one end of the rotating shaft (42) is connected to a driving source; Assembly (5), the assembly (5) includes two sets of connecting plates (51) and a mounting plate (52).

10. The knife switch according to claim 9, characterized in that: The two sets of connecting plates (51) are installed and connected to the two sets of side plates (41) by bolts, the mounting plate (52) is installed between the two sets of side plates (41) by bolts, and the static contact (11) is installed at the top of the mounting plate (52) by bolts, and the round shaft (131) is installed outside the rotating shaft (42) through a keyway.

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