Pillar type pole-mounted circuit breaker

Abstract

The utility model discloses a pillar type pole-mounted circuit breaker, which comprises a mechanism box, three poles are fixedly mounted at the top of the mechanism box, each pole comprises an airtight insulating shell, the bottom of each airtight insulating shell is fixedly connected with the top of the mechanism box, and the bottom of each airtight insulating shell is fixedly connected with the top of the mechanism box. And an arc extinguish chamber with a positioning sleeve is fixedly mounted at the top of the airtight insulating shell. According to the utility model, the dry environment-friendly gas nitrogen with zero gauge pressure is filled in the circuit breaker box body, so that the problem of internal condensation is solved, the nitrogen is the environment-friendly gas, does not generate toxic substances under the action of electric arc, can be directly discharged into the atmosphere when the circuit breaker fails, does not generate pollution, and has a specific gravity smaller than that of air, so that the service life of the circuit breaker is prolonged. The dry nitrogen floats up in the box body, under the condition that the air pressures inside and outside the box body are the same, the process of air exchange between the inside and outside of the box body is greatly slowed down, the inside of the circuit breaker is in the dry environment-friendly nitrogen, and the phenomenon of condensation in the circuit breaker under the condition that the daily temperature difference is large is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a pillar-type column-mounted circuit breaker. Background Art

[0002] The arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing of the pillar-type pole-mounted circuit breaker are both vacuum, and it has the advantages of small size, light weight, suitable for frequent operation, and no maintenance required for arc extinguishing. It is widely used in distribution networks. The protection level of 10kV vacuum pillar-type pole-mounted circuit breaker is IP65~IP67. Simply improving the protection level of the shell can only solve the problem of external moisture intrusion, but cannot solve the condensation problem inside the circuit breaker. The moisture generated by condensation will still affect the performance of the circuit breaker. This phenomenon is particularly significant in areas with large daily temperature differences.

[0003] In the prior art, a method for solving condensation is to inject SF6 gas into a box-type pole-mounted circuit breaker with the same protection level to solve the internal condensation problem. However, SF6 gas has a great impact on the environment and will produce highly toxic and harmful substances when encountering an arc. When the circuit breaker fails, SF6 will be discharged into the atmosphere, which will cause pollution. Toxic substances are difficult to handle. At the same time, the box-type pole-mounted circuit breaker has a cover on the top of the box body. The specific gravity of SF6 gas is greater than that of air, which produces a "sinking" effect, which can extend the exchange period between the SF6 gas inside the box and the external air. However, the moving end cover of the pillar-type pole-mounted circuit breaker box is at the bottom, and the "sinking" effect instead promotes the exchange between gases. Utility Model Content

[0004] The technical problem to be solved by the utility model is a solution to the internal condensation problem of injecting SF6 gas into a box-type pole-mounted circuit breaker with the same protection level. However, SF6 gas has a great impact on the environment and will produce highly toxic and harmful substances after encountering an electric arc. When the circuit breaker fails, SF6 will be discharged into the atmosphere, which will cause pollution. The toxic substances are difficult to handle, and the specific gravity of SF6 gas is greater than that of air. Therefore, the utility model is only suitable for box-type pole-mounted circuit breakers sealed at the top, and is not suitable for pillar-type pole-mounted circuit breakers.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: providing a pillar-type pole-mounted circuit breaker, comprising a mechanism box, three poles are fixedly installed on the top of the mechanism box, the three poles all comprise an airtight insulating shell, the bottom of the airtight insulating shell is fixedly connected to the top of the mechanism box, an arc extinguishing chamber with a positioning sleeve is fixedly installed on the top of the airtight insulating shell, the bottom end of the arc extinguishing chamber extends through the inside of the airtight insulating shell, a transmission member is installed at the connection between the airtight insulating shell and the mechanism box, a static end conductive rod of the arc extinguishing chamber is fixedly connected to the top of the arc extinguishing chamber, and the bottom end of the static end conductive rod of the arc extinguishing chamber extends through the inside of the arc extinguishing chamber;

[0006] A current transformer is fixedly mounted on one side of the surface of the airtight insulating shell, and an outgoing line side conductive rod is fixedly mounted on the side of the surface of the current transformer away from the airtight insulating shell. One end of the outgoing line side conductive rod extends into the interior of the airtight insulating shell and is connected to the moving end of the arc extinguishing chamber through a conductive member.

[0007] Preferably, the interior of the airtight insulating shell and the mechanism box are filled with nitrogen, and the mechanism box and the airtight insulating shell are connected.

[0008] Preferably, an inflation interface is fixedly connected to one side of the surface of the mechanism box, and the inflation port is formed with an M8 internal thread. The inflation interface 14 can be externally connected to a valve to draw a relatively low vacuum degree into the cavity formed by the mechanism box and the airtight insulating shell, and fill the cavity with nitrogen with zero gauge pressure. A deflation interface is fixedly connected to one side of the surface of the mechanism box and located below the inflation interface, which can be used for deflation.

[0009] Preferably, the inner walls of the inflation interface and the deflation interface are both threadedly connected with sealing studs, and the inflation port is sealed using an M8×10 sealing stud 13 coated with leak-proof glue and screwed into the inflation interface. There is no pressure difference between nitrogen and the outside air, and the nitrogen in the cavity formed by the mechanism box and the airtight insulating shell will not leak.

[0010] Preferably, a bottom plate is installed at the bottom of the airtight insulating shell, and a sealing gasket is sleeved and fixedly connected on the outer side wall of the bottom plate, which can increase the sealing between the bottom plate and the mechanism box.

[0011] Preferably, a transformer secondary wire tube is fixedly connected to the bottom end of the current transformer, and one end of the transformer secondary wire tube is fixedly connected to the outer side wall of the mechanism box.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model solves the problem of internal condensation by filling the inside of the circuit breaker box with dry environmentally friendly gas nitrogen with zero gauge pressure. Nitrogen is an environmentally friendly gas and will not produce toxic substances under the action of electric arc. When the circuit breaker fails, it can be directly discharged into the atmosphere without causing pollution. The specific gravity of nitrogen is less than that of air. The dry nitrogen "floats" inside the box. When the air pressure inside and outside the box is the same, the process of gas exchange between the inside and outside of the box is greatly slowed down. The inside of the circuit breaker will be in the dry environmentally friendly gas nitrogen, avoiding the condensation phenomenon inside when the temperature difference is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial stereoscopic diagram of the pillar-type column mounted circuit breaker of the utility model;

[0015] Figure 2 It is a cross-sectional view of the pillar-type column mounted circuit breaker of the utility model;

[0016] Figure 3 It is a rear view of the pillar-type pole-mounted circuit breaker of the utility model.

[0017] In the figure: 1. Mechanism box; 2. Airtight insulating shell; 3. Conductive rod at the static end of the arc extinguishing chamber; 4. Current transformer; 5. Arc extinguishing chamber; 6. Conductive rod at the outgoing line side; 7. Transmission parts; 8. Secondary wire tube of the transformer; 9. Nitrogen; 10. Sealing gasket; 11. Bottom plate; 12. Venting interface; 13. Sealing stud; 14. Inflating interface. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0019] See also Figure 1 one Figure 3 A pillar-type column-mounted circuit breaker comprises a mechanism box 1, three poles are fixedly mounted on the top of the mechanism box 1, the three poles all comprise an airtight insulating housing 2, the bottom of the airtight insulating housing 2 is fixedly connected to the top of the mechanism box 1, an arc extinguishing chamber 5 with a positioning sleeve is fixedly mounted on the top of the airtight insulating housing 2, the bottom end of the arc extinguishing chamber 5 extends through the inside of the airtight insulating housing 2, a transmission member 7 is mounted at the connection between the airtight insulating housing 2 and the mechanism box 1, a static end conductive rod 3 of the arc extinguishing chamber is fixedly connected to the top of the arc extinguishing chamber 5, and the bottom end of the static end conductive rod 3 of the arc extinguishing chamber extends through the inside of the arc extinguishing chamber 5;

[0020] A current transformer 4 is fixedly installed on one side of the surface of the airtight insulating casing 2, and an outgoing line side conductive rod 6 is fixedly installed on the side of the surface of the current transformer 4 away from the airtight insulating casing 2. One end of the outgoing line side conductive rod 6 extends through the interior of the airtight insulating casing 2 and is connected to the moving end of the arc extinguishing chamber 5 through a conductive part. The bottom end of the current transformer 4 is fixedly connected to a transformer secondary wire tube 8, and one end of the transformer secondary wire tube 8 is fixedly connected to the outer wall of the mechanism box 1.

[0021] like Figure 2 and Figure 3As shown, the interior of the airtight insulating shell 2 and the mechanism box 1 are filled with nitrogen 9, the mechanism box 1 and the airtight insulating shell 2 are connected, and a charging interface 14 is fixedly connected to one side of the surface of the mechanism box 1, and the charging port is made with an M8 internal thread. The charging interface 14 can be externally connected to a valve to draw a relatively low vacuum degree from the cavity formed by the mechanism box 1 and the airtight insulating shell 2, and nitrogen 9 with zero gauge pressure is filled into the cavity. A deflation interface 12 is fixedly connected to one side of the surface of the mechanism box 1 and located below the charging interface 14, which can be used for The inner walls of the deflation, inflation interface 14 and the deflation interface 12 are both threadedly connected with a sealing stud 13. The inflation port uses an M8×10 sealing stud 13 coated with leak-proof glue and screwed into the inflation interface 14 to complete the sealing. There is no pressure difference between the nitrogen 9 and the outside air. The nitrogen 9 in the cavity formed by the mechanism box 1 and the airtight insulating shell 2 will not leak. A bottom plate 11 is installed at the bottom of the airtight insulating shell 2, and a sealing gasket 10 is fixedly connected to the outer wall of the bottom plate 11, which can increase the sealing between the bottom plate 11 and the mechanism box 1.

[0022] When the utility model circuit breaker is used, the charging interface 14 is externally connected to the valve, pipeline and vacuum pump, and the cavity formed by the mechanism box 1 and the airtight insulating shell 2 is vacuumed to -0.01MPa, and the valve is closed to maintain the negative pressure in the cavity. The valve is externally connected to the charging device, and nitrogen 9 is rushed into the cavity. The mechanism box 1 is deformed and restored, and the charging device and the valve are closed. The valve charging interface 14 is removed, and the nitrogen 9 in the cavity formed by the mechanism box 1 and the airtight insulating shell 2 will overflow to reach the same pressure inside and outside, that is, zero gauge pressure, and the plugging stud 13 is coated with anti-leakage glue and then screwed into the charging interface 1 4. Since there is no pressure difference between nitrogen 9 and the outside air, no leakage will occur. The introduction of dry nitrogen 9 can avoid condensation caused by the large temperature difference between day and night, and nitrogen 9 will not produce toxic substances under the action of the electric arc. When the circuit breaker is damaged or repaired, it can be directly discharged into the atmosphere, which is safe, environmentally friendly and more practical. After the circuit breaker has been used for a certain period of time, it is vacuumed again as described above and filled with nitrogen 9. When filling, the venting interface 12 needs to be opened, and the inside of the circuit breaker is "flushed" with dry nitrogen 9. After confirming that the inside of the circuit breaker is fully dry, the venting interface 12 is blocked to complete the filling and blocking.

[0023] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pillar-type pole-mounted circuit breaker, comprising a mechanism box (1), characterized in that: Three poles are fixedly mounted on the top of the mechanism box (1), and the three poles all include an airtight insulating shell (2). The bottom of the airtight insulating shell (2) is fixedly connected to the top of the mechanism box (1). An arc extinguishing chamber (5) with a positioning sleeve is fixedly mounted on the top of the airtight insulating shell (2). The bottom end of the arc extinguishing chamber (5) extends through the inside of the airtight insulating shell (2). A transmission member (7) is mounted at the connection between the airtight insulating shell (2) and the mechanism box (1). The top of the arc extinguishing chamber (5) is fixedly connected to a conductive rod (3) at the static end of the arc extinguishing chamber. The bottom end of the conductive rod (3) at the static end of the arc extinguishing chamber extends through the inside of the arc extinguishing chamber (5). A current transformer (4) is fixedly mounted on one side of the surface of the airtight insulating housing (2); an outgoing line-side conductive rod (6) is fixedly mounted on the side of the surface of the current transformer (4) away from the airtight insulating housing (2); one end of the outgoing line-side conductive rod (6) extends through the interior of the airtight insulating housing (2) and is connected to the moving end of the arc extinguishing chamber (5) via a conductive member.

2. The pillar-type pole-mounted circuit breaker according to claim 1, characterized in that: The interior of the airtight insulating housing (2) and the mechanism box (1) are filled with nitrogen (9), and the mechanism box (1) and the airtight insulating housing (2) are in communication.

3. The pillar-type pole mounted circuit breaker according to claim 1, characterized in that: An inflation interface (14) is fixedly connected to one side of the surface of the mechanism box (1), and an deflation interface (12) is fixedly connected to one side of the surface of the mechanism box (1) and located below the inflation interface (14).

4. The pillar-type pole mounted circuit breaker according to claim 3, characterized in that: The inner side walls of the inflation interface (14) and the deflation interface (12) are both threadedly connected with blocking studs (13).

5. The pillar-type pole mounted circuit breaker according to claim 1, characterized in that: A bottom plate (11) is installed at the bottom of the airtight insulating housing (2), and a sealing gasket (10) is sleeved and fixedly connected on the outer side wall of the bottom plate (11).

6. The pillar-type pole mounted circuit breaker according to claim 1, characterized in that: The bottom end of the current transformer (4) is fixedly connected to a transformer secondary wire tube (8), and one end of the transformer secondary wire tube (8) is fixedly connected to the outer side wall of the mechanism box (1).

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