A spring mechanism energy storage locking switch structure

Abstract

A spring mechanism energy storage locking switch structure includes an energy storage shaft, an optimized energy storage cam, a micro switch, and an auxiliary switch. By adjusting the contact area between the energy storage cam and the micro switch and the separation point between the two, the contact time is extended, and the micro switch is disconnected after the auxiliary switch is reliably opened, meeting the requirements of the national power grid. The optimized structure is simple in design, fully utilizes the existing structure, realizes reliable and stable functions, is easy to transform and implement, and has the advantages of low cost and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switch transmission equipment, and in particular to a circuit breaker spring mechanism used in a high-voltage sulfur hexafluoride gas insulated metal-enclosed switchgear. Background Art

[0002] Switchgear is an important electrical equipment in the power system. As users' awareness of the use of switchgear increases, the requirements for the control and protection of switchgear also increase. The latest requirements put forward by the State Grid stipulate that the contacts for realizing the non-energy storage locking closing in the circuit breaker closing control circuit must be hard contacts, that is, the contacts of the switch, and cannot be relay-type contacts. In accordance with the requirements of the State Grid, this function can be realized by connecting the microswitch in the spring mechanism used for closing energy storage to the circuit breaker closing circuit. This patent optimizes the original locking structure, adds a pair of energy storage microswitches to realize the locking function, and adjusts the energy storage locking time to ensure that the auxiliary switch disconnects the circuit breaker closing circuit before the microswitch. Summary of the invention

[0003] In view of the above problems, the present invention proposes a spring mechanism energy storage locking switch structure, through which the circuit breaker closing control circuit can be locked, so that the circuit breaker closing operation is prohibited when the spring mechanism is not energy stored. At the same time, by optimizing the structure, it is ensured that the disconnection and closing circuit is still realized by the auxiliary switch.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a spring mechanism energy storage locking switch structure, characterized in that: an energy storage cam is installed on the energy storage shaft and is driven to rotate by the energy storage shaft; a micro switch corresponding to the height of the energy storage cam is provided on the side of the energy storage cam, and the micro switch controls the on and off of the locking contact; the energy storage cam is a rotatable circular wheel structure as a whole, and a gap is left between the circular wheel structure and the micro switch, and a protrusion extending in the radial direction is provided on the outer circumference of the circular wheel, and the protrusion and the circular wheel structure have a smooth transition, the arc length of the protrusion is 40-45mm, and the central angle is 42°; when the protrusion is in contact with the micro switch, the locking contact is turned on; when the protrusion is in contact with the micro switch but not in contact, the locking contact is disconnected; the locking contact controls the on and off of the circuit breaker closing circuit.

[0005] The arc length of the protrusion is 42 mm.

[0006] The micro switch is installed on the base through a bracket.

[0007] An auxiliary switch contact, a closing coil and a locking contact are connected in series on the circuit breaker closing circuit.

[0008] One end of the circuit breaker closing circuit is connected to the positive end of the closing command, and the other end is connected to the negative end of the closing command, so as to control the on-off state of the closing circuit.

[0009] When the energy storage cam rotates one circle, the contact time between the protrusion and the micro switch is 30ms.

[0010] The beneficial effects of the present invention are:

[0011] 1. An energy storage cam and a micro switch for storing energy in place are arranged on the end face of the energy storage shaft of the spring mechanism, and no other structures need to be changed or added, which is low in cost.

[0012] 2. The newly added non-energy storage position point of the micro switch is connected in series to the closing control circuit to realize the function of prohibiting closing operation when no energy is stored, with stable operation and precise action.

[0013] 3. Adjust the contact surface and separation point of the energy storage cam and micro switch to ensure that the auxiliary switch disconnects and closes the circuit to avoid the risk of burning and secondary circuit breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural state diagram of the present invention when no energy is stored before closing.

[0015] Figure 2 yes Figure 1 Schematic diagram of the control part.

[0016] Figure 3 It is a structural state diagram of the present invention when energy has been stored before closing.

[0017] Figure 4 yes Figure 2 Schematic diagram of the control part.

[0018] Figure 5 It is a structural state diagram of the present invention when no energy is stored after closing.

[0019] Figure 6 for Figure 5 Schematic diagram of the control part. DETAILED DESCRIPTION

[0020] A spring mechanism energy storage locking switch structure, wherein an energy storage cam 2 is mounted on an energy storage shaft 1 and is driven to rotate by the energy storage shaft 1; a micro switch 3 corresponding to the height of the energy storage cam 2 is provided on the side surface of the energy storage cam 2, and the micro switch 3 controls the on and off of a locking contact 4; the energy storage cam 2 is a rotatable circular wheel structure as a whole, and a gap is left between the circular wheel structure and the micro switch 3, and a protrusion 2-1 extending in a radial direction is provided on the outer circumference of the circular wheel, and the protrusion 2-1 and the circular wheel structure have a smooth transition, the arc length of the protrusion 2-1 is 40-45mm, and the central angle is 42°; when the protrusion 2-1 is in contact with the micro switch 3, the locking contact 4 is turned on; when the protrusion 2-1 is in contact with the micro switch 3 but not in contact with the micro switch 3, the locking contact 4 is disconnected; the locking contact 4 controls the on and off of a circuit breaker closing circuit.

[0021] Preferably, the arc length of the protrusion 2-1 is 42 mm. Furthermore, when the energy storage cam 2 rotates one circle, the contact time between the protrusion 2-1 and the micro switch 3 is 30 ms.

[0022] Preferably, the micro switch 3 is mounted on the base 8 via a bracket 7 .

[0023] Preferably, the circuit breaker circuit is provided with auxiliary switch contacts 5, closing coil 6 and locking contacts 4 in series. Furthermore, one end of the circuit breaker closing circuit is connected to the positive end of the closing command, and the other end is connected to the negative end of the closing command, so as to control the on-off state of the closing circuit.

[0024] When used specifically:

[0025] As shown in the figure, the optimized structure of the spring mechanism energy storage locking switch includes an energy storage shaft 1, an energy storage cam 2, a micro switch 3, a micro switch locking contact 4, an auxiliary switch contact 5, and a closing coil 6.

[0026] When the spring mechanism is not storing energy Figure 1 As shown, the energy storage cam 2 is not in contact with the micro switch 3, the micro switch locking contact 4 is in a disconnected state, the closing control circuit is powered off, the closing coil cannot be attracted, and the closing operation cannot be completed, meeting the State Grid's requirement that the spring mechanism cannot be closed without energy storage.

[0027] The spring mechanism stores energy, and the energy storage cam 2 rotates clockwise. When it is fully in contact with the micro switch, the energy storage stops, and the spring mechanism has stored energy. Figure 3 As shown, at this time, the micro switch locking contact 4 is converted to the on state, the closing control circuit is connected, and the closing operation can be performed.

[0028] After the closing control circuit is connected, the energy storage shaft 1 rotates clockwise to release energy to complete the closing operation. At the same time, the energy storage cam 2, micro switch 3, micro switch locking contact 4 and auxiliary switch 5 are in action. The optimized structure extends the contact surface between the energy storage cam 2 and the micro switch 3 and delays the separation point between the two, ensuring that the micro switch locking contact 4 will not be disconnected before the auxiliary switch 5 is disconnected, so that the disconnection of the closing circuit is completely realized by the auxiliary switch 5. When the auxiliary switch 5 disconnects the circuit, the energy storage cam 2 is out of contact with the micro switch 3, and the micro switch locking contact 4 is disconnected. The final state is shown in Figure 5.

[0029] In the existing structure, the contact distance between the energy storage cam and the micro switch is 28mm, and the time for the micro switch to change from closed to open is 20ms, which is close to the disconnection time of the auxiliary switch of the mechanism (25ms). The original position coordination of the energy storage cam and the micro switch only takes into account the stop of energy storage, and cannot meet the current requirements of the State Grid for access circuits. It is easy to cause unreliable opening of the auxiliary switch, and the secondary circuit is cut off by the micro switch, which may burn the micro switch and cause the secondary circuit to be broken.

[0030] This optimized structure extends the contact distance between the energy storage cam and the micro switch to 42mm, and the time for the micro switch to switch from closed to open is increased to 30ms. It is designed to lag behind the disconnection time of the auxiliary switch, effectively avoiding the risk of burning the micro switch and breaking the secondary circuit.

Claims

1. A spring mechanism energy storage locking switch structure, characterized in that: The energy storage cam (2) is mounted on the energy storage shaft (1) and driven to rotate by the energy storage shaft (1); a micro switch (3) corresponding to the height of the energy storage cam (2) is provided on the side surface of the energy storage cam (2); the micro switch (3) controls the on and off of the locking contact (4); the energy storage cam (2) is a rotatable round wheel structure as a whole, a gap is left between the round wheel structure and the micro switch (3), a protrusion (2-1) extending in a radial direction is provided on the outer circumference of the round wheel, and the protrusion (2-1) and the round wheel structure are in contact with each other. The protrusion (2-1) has an arc length of 40-45 mm and a central angle of 42°; when the protrusion (2-1) is in contact with the micro switch (3), the locking contact (4) is turned on; when the protrusion (2-1) is not in contact with the micro switch (3), the locking contact (4) is turned off; the locking contact (4) controls the on and off of the circuit breaker closing circuit; when the energy storage cam (2) rotates one circle, the contact time between the protrusion (2-1) and the micro switch (3) is 30 ms.

2. A spring mechanism energy storage locking switch structure according to claim 1, characterized in that: The arc length of the protrusion (2-1) is 42 mm.

3. A spring mechanism energy storage locking switch structure according to claim 1, characterized in that: The micro switch (3) is mounted on a base (8) via a bracket (7).

4. The spring mechanism energy storage locking switch structure according to claim 1, characterized in that: An auxiliary switch contact (5), a closing coil (6) and a locking contact (4) are connected in series on the circuit breaker closing circuit.

5. The spring mechanism energy storage locking switch structure according to claim 1, characterized in that: One end of the circuit breaker closing circuit is connected to the positive end of the closing command, and the other end is connected to the negative end of the closing command, so as to control the on-off state of the circuit breaker closing circuit.

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