Closing limiting device

Abstract

The invention provides a closing limiting device for a ring main unit, which comprises a main limiting part and a pre-limiting part which are arranged on a static contact of the ring main unit, the pre-limiting part is connected to one end of the main limiting part, and a moving contact is pre-limited before the main limiting part carries out main limiting on the moving contact of the ring main unit. The closing limiting device is simple in structure, small in rebound amplitude, reliable in performance, low in cost and capable of effectively reducing the closing rebound amplitude and improving the closing reliability.

Description

Technical Field

[0001] The invention relates to a closing limit device, in particular to a closing limit device of a three-position switch in a ring network cabinet product. Background Art

[0002] In the ring main unit products, three-position switch is standard configuration, which is divided into three-position switch on bus side and three-position switch on cable side. Three-position switch often has the demand of closing short-circuit current, that is, there is a certain requirement for the closing speed. After the fast closing, the reaction force of the limiter makes the knife switch have a certain rebound, and the size of the rebound directly affects the reliability of the closing, which cannot be ignored.

[0003] Conventional closing limit devices generally use rigid limiters, which have large rebound amplitudes, affecting the reliability of closing, and are complex in structure, have many parts, and are costly. Therefore, it is necessary to develop a closing limit device with a simple structure, small rebound amplitude, reliable performance, and low cost to reduce the closing rebound amplitude and improve the reliability of closing. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a new closing limit device.

[0005] The first aspect of the present invention provides a closing limit device for a ring network cabinet, comprising: a main limit part and a pre-limit part installed on the static contact of the ring network cabinet, the pre-limit part is connected to one end of the main limit part, and the moving contact is pre-limited before the main limit part performs the main limit on the moving contact of the ring network cabinet.

[0006] In the closing limit device provided in the second aspect of the present invention, the main limit portion and the pre-limit portion are integrally formed and made of polyurethane material.

[0007] In the closing limit device provided by the third aspect of the present invention, the main limit part has: a first groove for accommodating the thickness of the static contact; a screw hole that crosses the first groove, and the screw hole is used to fix the closing limit device to the static contact; and main limit surfaces arranged on both sides of the first groove, and when the main limit is performed, the moving contact is in contact with the main limit surface.

[0008] In the closing limit device provided in the fourth aspect of the present invention, the pre-limiting portion is substantially L-shaped, one end of which is connected to the main limiter portion, and the other end of which is provided with a pre-stressing surface.

[0009] In the closing limit device provided in the fifth aspect of the present invention, in the depth direction of the first groove, the pre-stressed surface protrudes further toward the moving contact than the main limit surface.

[0010] In the closing limit device provided in the sixth aspect of the present invention, the pre-limit part further has a deformation zone between the pre-stressing surface and the connecting portion between the pre-limit part and the main limit part.

[0011] In the closing limit device provided in the seventh aspect of the present invention, a second groove is provided with a certain gap between the pre-limiting portion and the main limiting portion.

[0012] By utilizing the closing limit device of the present invention, the closing rebound amplitude can be effectively reduced and the closing reliability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a comparison diagram showing the closing limit device of the present invention and the conventional closing limit device on the market.

[0014] Figure 2 It is a detailed schematic diagram of a conventional closing limit device.

[0015] Figure 3 It is a disassembled structural diagram of the closing limit device of the present invention.

[0016] Figure 4 It is a detailed schematic diagram of the closing limit device of the present invention. DETAILED DESCRIPTION

[0017] In order to explain the present invention in more detail, the following describes the method for implementing the present invention according to the accompanying drawings. In the accompanying drawings, the same or corresponding reference numerals are used to represent the same or corresponding technical features.

[0018] Figure 1 It is a comparison diagram showing the closing limit device of the present invention and the conventional closing limit device on the market. Figure 1 The left side shows a conventional closing limit device 200 currently on the market.

[0019] Figure 2 This is a detailed schematic diagram of a conventional closing limit device. Figure 2 As shown in the lower right part, the conventional closing limit device 200 is formed by sequentially sleeved limit sleeves 202 and 203 on a screw 201, and then fixing the ends with a locking nut 204. Figure 2 As shown in the upper right part, during installation, first insert the limit sleeve 202 into the screw 201, and then insert the screw 201 into the positioning hole at the front end of the static contact 3. Next, insert the limit sleeve 203 into the screw 201, and fix the end with the locking nut 204. The limit sleeve 202 and the limit sleeve 203 clamp the static contact 3 in the thickness direction. Figure 2 As shown in the left part, when performing the closing action, the moving contact 4 rotates clockwise around the rotating shaft 5. When rotating to the closing position, the front end of the moving contact 4 overlaps with the front end of the static contact 3, and the current is conducted. The moving contact 4 rotates further and rigidly contacts the closing limit device 200. The closing limit device 200 prevents the moving contact 4 from rotating further and limits the moving contact 4.

[0020] As mentioned above, the conventional closing limit device 200 generally adopts a rigid limit, which has a large rebound amplitude, affects the reliability of closing, and has a complex structure, many parts and components, and high cost.

[0021] Back to Figure 1 .like Figure 1 As shown on the right, the closing limit device 100 of the present invention can effectively reduce the closing rebound amplitude and improve the closing reliability by introducing a buffer limit.

[0022] Figure 3 : is a disassembled structural diagram of the closing limit device of the present invention. The closing limit device 100 of the present invention has a main limit portion 120 and a pre-limit portion 130 installed on the static contact 3. The pre-limit portion 130 is connected to one end of the main limit portion 120, and pre-limits the moving contact 4 before the main limit portion 120 performs the main limit on the moving contact 4. The closing limit device 100 of the present invention can be made of a polyurethane material with high strength and high toughness. It can be understood by ordinary technicians in this field that the material of the closing limit device 100 is not limited to this.

[0023] The main limiting portion 120 has a groove 102 for accommodating the thickness of the static contact 3. The groove 102 is clamped in the thickness direction of the static contact. At the main limiting position, the bottom plane 103 of the groove abuts against the abutment surface 301 of the static contact 3, limiting the displacement of the closing limiting device 100 in the thickness direction of the static contact 3 and the counterclockwise rotation.

[0024] The main stopper 120 also has a screw hole 104 that crosses the groove 102 for receiving a screw ( Figure 3 The closing limit device 100 can be inserted into the positioning hole 302 and the screw hole 104. Figure 3 not shown) pivots.

[0025] The main limiting portion 120 also has main limiting surfaces 105 arranged on both sides of the groove 103. After the switch is closed, the moving contact 4 is in contact with the main limiting surface 105, and the closing is terminated.

[0026] The lower plane 106 of the groove of the main limiting portion 120 abuts against the front end surface 303 of the static contact 3 to position the closing limiting device 100 in the length direction of the static contact 3 .

[0027] The pre-limiting portion 130 is generally L-shaped. One end is connected to the main limiting portion 120 and can be integrally formed with the main limiting portion 120. The other end is provided with a pre-stressing surface 107. In the depth direction of the groove 102, the pre-stressing surface 107 protrudes further toward the moving contact 4 relative to the main limiting surface 105, so as to ensure that when the moving contact 4 performs a closing action, the pre-stressing surface 107 can contact the moving contact 4 earlier than the main limiting surface 105, thereby performing a pre-limiting buffering action.

[0028] The pre-limiting portion 130 is further provided with a deformation zone 108 between the pre-pressing surface 107 and the connection portion between the pre-limiting portion 130 and the main limiting portion 120. At the same time, a groove 109 is provided between the pre-limiting portion 130 and the main limiting portion 120 at a certain gap.

[0029] like Figure 3 As shown in the left part, when the moving contact 4 performs the closing action, it first contacts the pre-pressing surface 107 of the pre-limiting portion 130, and the closing limit device 100 performs the pre-limiting action. Then, as the moving contact 4 further rotates clockwise, the moving contact 4 contacts the main limit surface 105, and the closing limit device 100 performs the main limit action.

[0030] Figure 4 Detailed schematic diagram of the closing limit device of the present invention. Figure 4 The installation and working process of the closing limit device 100 are described.

[0031] like Figure 4 As shown in the right part, when the abutting surface 301 of the static contact 3 is embedded in the groove 102, the screw hole 104 is aligned with the positioning hole 302, and after the screw 110 is inserted through the screw hole 104 and the positioning hole 302, the locking nut 111 is used to lock and position the closing limit device 100, while ensuring that the closing limit device 100 can pivot around the screw 110.

[0032] like Figure 4 As shown in the left part, when performing the closing action, the moving contact 4 rotates clockwise around the rotating shaft 5. When rotating to the closing position, the front end of the moving contact 4 overlaps with the front end of the static contact 3, and the current is conducted. The moving contact 4 rotates further and first contacts the pre-stressed surface 107 of the closing limit device 100 of the present invention. At this time, the pre-stressed surface 1 pre-limits the moving contact 4. The deformation area 108 deforms to absorb part of the closing energy. The groove 109 provides deformation possibility for the deformation area 108, and effective deformation can effectively absorb the closing energy.

[0033] The moving contact 4 further rotates and contacts the main limiting surface 105 of the closing limiting device 100 of the present invention. At this time, the main limiting surface 105 mainly limits the moving contact 4. The bottom plane 103 of the groove abuts against the abutting surface 301 of the static contact 3 to limit the counterclockwise rotation of the closing limiting device 100. The main limiting surface 105 itself can also deform to buffer the moving contact 4 to absorb part of the impact energy.

[0034] After the main limit action is completed, the main limit surface 105, the deformation zone 108 and the groove 109 recover the deformation process, so that the moving contact 4 rebounds. The energy of the rebound is much smaller than the energy of the moving contact 4 closing, which greatly reduces the amplitude of the rebound.

Claims

1. A closing limit device for a ring main unit, characterized in that: include: The main limit part and the pre-limit part are installed on the static contact of the ring main unit, The pre-limiting portion is connected to one end of the main limiting portion, and performs pre-limiting on the moving contact before the main limiting portion performs main limiting on the moving contact of the ring network cabinet.

2. The closing limit device according to claim 1, characterized in that: The main limiting portion and the pre-limiting portion are integrally formed and made of polyurethane material.

3. The closing limit device according to claim 1 or 2, characterized in that: The main limiting part has: a first groove for accommodating the thickness of the stationary contact; a screw hole that crosses the first groove, the screw hole being used to fix the closing limit device to the static contact; and The main limiting surfaces are arranged on both sides of the first groove, and when the main limiting is performed, the moving contact is in contact with the main limiting surfaces.

4. The closing limit device according to claim 3, characterized in that: The pre-limiting portion is substantially L-shaped, one end of which is connected to the main limiting portion, and the other end of which is provided with a pre-pressing surface.

5. The closing limit device according to claim 4, characterized in that: In the depth direction of the first groove, the pre-compression surface protrudes further toward the moving contact relative to the main limiting surface.

6. The closing limit device according to claim 4, characterized in that: The pre-limiting portion further includes a deformation zone between the pre-pressing surface and a connecting portion between the pre-limiting portion and the main limiting portion.

7. The closing limit device according to claim 4, characterized in that: A certain gap is also provided between the pre-limiting portion and the main limiting portion, and a second groove is provided.

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