FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. WIRING-IMPROVED STRUCTURE FOR ROTARY DOUBLE-BREAKPOINT
SWITCH CONTACT SYSTEM
2.
1. (A) SHANGHAI LIANGXIN ELECTRICAL CO., LTD
(B) China
(C) No.2000 South ShenJiang Road, Pudong New District, Shanghai 201315,
China
5
The following specification particularly describes the invention and the manner in which it is to be
performed.
2
5 Technical Field
The present invention relates to the field of disconnector technologies, and specifically,
to an improved wiring structure of a contact system of a rotary double-break switch.
Related Art
A disconnector is the most-used electric appliance in high-voltage switch electric
10 appliances. A main feature of the disconnector is that the disconnector has no arc
extinguishing capacity and can close or open a circuit only when there is no load current.
The disconnector is used for all classes of voltages, and is used for changing a circuit
connection or isolating a line or device from a power supply. The disconnector has no
breaking capacity and only can perform an operation after the line is closed by using another
15 device. The disconnector is usually provided with an interlock apparatus used for preventing
a misoperation when a switch carries a load. Sometimes, a pin is required to prevent the
switch from being turned off under a magnetic effect of a big fault. In a circuit system, when
a circuit is faulty or corrective maintenance needs to be performed on a circuit, a circuit
breaker trips. In this case, the disconnector plays a role of cutting off a low current or
20 providing an obvious fracture, so as to ensure safety of a worker during repairing or
corrective maintenance. Generally, there are two types of disconnectors: an unenclosed
disconnector and a gas-insulated metal-enclosed disconnector. The unenclosed disconnector
is directly exposed to the air, and an obvious fracture may be viewed when the disconnector
is switched off, but the unenclosed disconnector is large in size and is relatively heavy. The
25 gas-insulated metal-enclosed disconnector is small in size and high in reliability, thereby is
widely used. The gas-insulated metal-enclosed disconnector usually includes three
disconnector single-phases, and each disconnector single-phase includes a cylinder body. A
moving contact, a fixed contact, and a driving mechanism that drives the moving contact to
move are disposed in the cylinder body. Electrical driving is used for most driving
30 mechanisms. However, the gas-insulated metal-enclosed disconnector is enclosed, and
therefore, a worker cannot directly observe and clearly sense whether the gas-insulated metalenclosed
disconnector is in a breaking state.
Currently, there is a common rotary double-break disconnector on the market. Wiring of
a contact system of the rotary double-break disconnector can only be implemented in a one35
direction wire-entry manner. Consequently, an application range of the rotary double-break
disconnector is narrowed. In some special scenarios where a mounting position of the
3
disconnector needs to be changed, a wiring direction 5 cannot be adjusted, causing
inapplicability of the disconnector.
SUMMARY
An objective of the present invention is to provide an improved wiring structure of a
contact system of a rotary double-break switch to resolve the technical defect that a wiring
10 direction of an existing rotary double-break disconnector is single. A wiring manner is
improved, so that a wiring direction of the contact system of the rotary double-break
disconnector can be flexibly changed, thereby satisfying a requirement on field mounting of
the disconnector.
Technical solution
15 To achieve the foregoing technical objective, the improved wiring structure of the
contact system of the rotary double-break switch designed in the present invention includes a
moving contact, a fixed contact, and a short-circuit busbar, where electrical connection
between the moving contact and the fixed contact can be achieved during rotation, and the
fixed contact is connected to the short-circuit busbar by using a terminal screw, so that the
20 terminal screw can enable wire entry along a circumferential direction.
Further, a mounting axis direction of the terminal screw is perpendicular to a principal
axis of the moving contact.
Further, the short-circuit busbar is of a shape of " ", two ends of the short-circuit
busbar are provided with terminal screw mounting vias, the short-circuit busbar is locked to a
25 tail end of the fixed contact by using the terminal screw, a head end of the fixed contact
extends into a slot of the moving contact, and during rotation of the moving contact, a contact
end can come into contact with the head end of the fixed contact to form electrical
connection.
Further, the tail end of the fixed contact is provided with a thread hole, and the head end
30 of the fixed contact is connected to the tail end by using a connecting portion.
Further, the head end of the fixed contact and the tail end are planar structures
perpendicular to each other.
Further, during rotation, the moving contact can come into contact with the head end of
the fixed contact to implement double-break.
35 Further, the moving contact is mounted onto a coupling.
4
Further, the moving contact, the fixed contact, and 5 the short-circuit busbar are mounted
onto a base.
Further, a bottom surface of a wiring port at which the terminal screw is connected to the
fixed contact tilts downward, so that a wiring angle of a connection wire inserted between the
terminal screw and the fixed contact is increased.
10 Beneficial effects
The present invention provides an improved wiring structure of a contact system of a
rotary double-break switch. A wiring manner is changed, that is, the fixed contact is
connected to the short-circuit busbar by using the terminal screw, so that the terminal screw
can enable wire entry along a circumferential direction. In this way, the wiring direction of
15 the contact system of the rotary double-break disconnector can be flexibly changed, thereby
satisfying a requirement on field mounting of the disconnector.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic exploded view of an embodiment of the present invention;
20 FIG. 3 is a schematic structural diagram of mounting a short-circuit busbar according to
an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a short-circuit busbar according to an
embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a moving contact according to an
25 embodiment of the present invention; and
FIG. 6 is a schematic structural diagram of a fixed contact according to an embodiment
of the present invention.
DETAILED DESCRIPTION
The following further describes the present invention with reference to the accompanying
30 drawings and embodiments.
Embodiment
As shown in FIG. 1 and FIG. 2, an improved wiring structure of a contact system of a
rotary double-break switch provided in the present invention includes: a moving contact 1, a
5
fixed contact 2, and a short-circuit busbar 3. Electrical 5 connection between the moving
contact 1 and the fixed contact 2 can be achieved during rotation, the fixed contact 2 is
connected to the short-circuit busbar 3 by using a terminal screw 4, and the terminal screw 4
can enable wire entry along a circumferential direction. In this embodiment, a wire enters
from an outer side (the right side).
10 Still, referring to FIG. 1, a mounting axis direction of the terminal screw 4 is
perpendicular to a principal axis of the moving contact 1. The moving contact 1, the fixed
contact 2, and the short-circuit busbar 3 are mounted onto a base 6.
As shown in FIG. 3 and FIG. 4, the short-circuit busbar 3 is of a shape of " ", two ends
of the short-circuit busbar 3 are respectively a planar structure and parallel to each other, and
15 the two ends are connected by using a rod or a plate structure therebetween. Each end is
provided with a terminal screw mounting via 301. One end is locked to a tail end 203 of the
fixed contact 2 by using the terminal screw 4 and can be used for external wiring (refer to
FIG. 2 and FIG. 6). The other end 305 extends into a connection slot 8 of the base 6 and can
be conveniently in communication with (in electrical connection to) another rotary double20
break switch that is used in combination when required. A head end 202 of the fixed contact
2 extends into a slot 101 of the moving contact 1, and a surface of the slot 101 is
perpendicular to the principal axis of the moving contact 1. In this way, during rotation of
the moving contact 1, a contact end 102 can come into contact with the head end 202 of the
fixed contact 2 to form electrical connection. In this embodiment, the mounting via 301 is a
25 gap, thereby facilitating connection. Certainly, an enclosed hole may alternatively be used.
Still referring to FIG. 1, a bottom surface 91 of a wiring port 9 at which the terminal
screw 4 is connected to the fixed contact 2 tilts downward (towards a bottom surface of the
base), so that different wiring angles between 0° and 45° of a connection wire inserted
between the terminal screw 4 and the fixed contact 2 can be achieved, thereby increasing the
30 wiring angle and facilitating wiring. A high bottom surface of an existing switch is almost
parallel to a surface of the base 6, and only one-direction wiring can be performed.
As shown in FIG. 6, the tail end of the fixed contact 2 is provided with a thread hole 201,
and the head end 202 of the fixed contact 2 is connected to the tail end 203 by using a
connecting portion 204. In this embodiment, the planar head end 202 of the fixed contact 2 is
35 perpendicular to a plane of the tail end 203 through a transition of the connecting portion 204,
so that the terminal screw 4 can enable wire entry along a circumferential direction.
6
Further, referring to FIG. 5, during rotation, the moving 5 contact 1 can come into contact
with head ends 202 of two fixed contacts 2 to implement double-break (please explain the
meaning of "double-break", and no explanation is required if "double-break" is a standard
noun in the industry).
The moving contact 1 is mounted onto a coupling 5.
10 According to the improved wiring structure of the contact system of the rotary doublebreak
switch provided in the present invention, a wiring manner is improved, and the fixed
contact 2 is connected to the short-circuit busbar 3 by using the terminal screw 4, so that the
terminal screw 4 can enable wire entry along the circumferential direction. In this way, the
wiring direction of the contact system of the rotary double-break disconnector can be flexibly
15 changed, thereby satisfying a requirement on field mounting of the disconnector of the
present invention at various positions.
The structures, scales, and sizes illustrated in the accompanying drawings of the
embodiments are merely used for understanding and reading by a person skilled in the art in
combination with the content disclosed in the specification, and are not intended to limit
20 constraint conditions to which the present can be applied, and therefore have no technically
essential meaning. Any modification to the structures, any change of scaling relations, or any
adjustment of the sizes without affecting the effects generated and objectives achieved by the
present invention should fall within the scope of the technical content disclosed in the present
invention. In addition, terms used in the specification such as "above", "below", "left",
25 "right", "middle", "clockwise", and "counterclockwise" are also used for clear description,
and are not intended to limit the implementation scope of the present invention. A change or
adjustment of relative relations without essentially changing the technical content should also
be considered as falling within the scope of the present invention.
7
5 WE CLAIM:
1. An improved wiring structure of a contact system of a rotary double-break switch,
comprising: a moving contact (1), a fixed contact (2), and a short-circuit busbar (3), wherein
electrical connection between the moving contact (1) and the fixed contact (2) can be
achieved during rotation, the fixed contact (2) is connected to the short-circuit busbar (3) by
10 using a terminal screw (4), and the terminal screw (4) can enable wire entry along a
circumferential direction.
2. The improved wiring structure of the contact system of the rotary double-break switch
according to claim 1, wherein a mounting axis direction of the terminal screw (4) is
perpendicular to a principal axis of the moving contact (1).
15 3. The improved wiring structure of the contact system of the rotary double-break switch
according to claim 1, wherein the short-circuit busbar (3) is of a shape of " ", two ends of
the short-circuit busbar (3) are provided with terminal screw mounting vias (301), the shortcircuit
busbar (3) is locked to a tail end of the fixed contact (2) by using the terminal screw
(4), a head end (202) of the fixed contact (2) extends into a slot (101) of the moving contact
20 (1), and during rotation of the moving contact (1), a contact end (102) can come into contact
with the head end (202) of the fixed contact (2) to form electrical connection.
4. The improved wiring structure of the contact system of the rotary double-break switch
according to claim 1, wherein the tail end (203) of the fixed contact (2) is provided with a
thread hole (201), and the head end (202) of the fixed contact (2) is connected to the tail end
25 (203) by using a connecting portion (204).
5. The improved wiring structure of the contact system of the rotary double-break switch
according to claim 1, wherein the head end (202) of the fixed contact (2) and the tail end
(203) are planar structures perpendicular to each other.
6. The improved wiring structure of the contact system of the rotary double-break switch
30 according to claim 1, wherein during rotation, the moving contact (1) can come into contact
with head ends (202) of two fixed contacts (2) to implement double-break.
7. The improved wiring structure of the contact system of the rotary double-break switch
according to claim 1, wherein the moving contact (1) is mounted onto a coupling (5).
8. The improved wiring structure of the contact system of the rotary double-break switch
35 according to claim 1, wherein the moving contact (1), the fixed contact (2), and the short8
circuit busbar 5 (3) are mounted onto a base (6).
9. The improved wiring structure of the contact system of the rotary double-break switch
according to claim 1, wherein a bottom surface (91) of a wiring port (9) at which the terminal
screw (4) is connected to the fixed contact (2) tilts downward, so that a wiring angle of a
connection wire inserted between the terminal screw (4) and the fixed contact (2) is
10 increased.