Three-phase circuit breaker

Abstract

The utility model relates to a three-phase circuit breaker comprising a circuit breaker body which comprises an A-phase pole, a B-phase pole and a C-phase pole, and each phase pole is filled with SF6 gas; the first branch pipeline is connected to the A-phase pole; the second branch pipeline is connected to the B-phase pole; the third branch pipeline is connected to the C-phase pole; the first branch pipeline, the second branch pipeline and the third branch pipeline are all connected to the main pipeline and are communicated with one another through the main pipeline, first one-way valves and second one-way valves are arranged on the first branch pipeline, the second branch pipeline and the third branch pipeline, and the first one-way valves and the second one-way valves are arranged in opposite directions. The second one-way valve comprises a locking nut, the first one-way valve and the second one-way valve are connected through the locking nut, and opening and closing of the first one-way valve and the second one-way valve are controlled through the locking nut. Therefore, only the fault phase is subjected to inflation maintenance, and the workload and the leakage of SF6 gas are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a three-phase linkage circuit breaker with double one-way valves. Background Art

[0002] In a three-phase circuit breaker device, when a gas leak occurs in one phase and requires maintenance, the traditional method requires recovering the gas in all three phases and then re-inflating all three phases after the repair. It is impossible to inflate only the faulty single-phase pole.

[0003] Specifically, such as Figure 1 As shown, the A, B, and C phase poles are connected to the corresponding branch pipes. After tightening the locknuts on the branch pipes, the spring of the check valve V1 is compressed, and the valve core of the check valve V1 opens under the action of the spring pressure, allowing gas to pass. The gas paths of the A, B, and C phase poles are connected and share a SF6 gas density meter to monitor the SF6 gas density. During use, if one of the A, B, and C phase poles leaks and requires maintenance, the gas must be recovered from the A, B, and C phase poles simultaneously. After the fault is resolved, the A, B, and C phase poles can be recharged simultaneously. It is not possible to charge only the faulty single-phase pole.

[0004] This not only increases unnecessary workload, but may also cause additional leakage during the handling of SF6 gas, affecting the environment. Utility Model Content

[0005] The embodiment of the present application provides a three-phase circuit breaker with a double one-way valve, which aims to solve this problem and achieve gas filling and maintenance only on the faulty phase, reducing workload and SF6 gas leakage, thereby saving costs and protecting the environment.

[0006] According to one aspect of an embodiment of the present application, a three-phase circuit breaker is provided, including: a circuit breaker body, the circuit breaker body including an A-phase pole, a B-phase pole and a C-phase pole, wherein the A-phase pole, the B-phase pole and the C-phase pole are all filled with SF6 gas; and a first branch pipeline, connected to the A-phase pole; a second branch pipeline, connected to the B-phase pole; a third branch pipeline, connected to the C-phase pole; and a main pipeline, the first branch pipeline, the second branch pipeline and the third branch pipeline are all connected to the main pipeline and communicate with each other through the main pipeline, wherein a first one-way valve and a second one-way valve are each provided on the first branch pipeline, the second branch pipeline and the third branch pipeline, and the first one-way valve and the second one-way valve are arranged in opposite directions, wherein the second one-way valve includes a locking nut, the first one-way valve and the second one-way valve are connected by the locking nut, and the opening and closing of the first one-way valve and the second one-way valve are controlled by the locking nut.

[0007] In this way, in the original gas pipeline of the three-phase circuit breaker, an additional one-way valve is added between the one-way valve and the gas pipeline. During normal operation of the three-phase circuit breaker, the locking nuts of the additional one-way valves are tightened, so that the springs of the two one-way valves are compressed, and the two one-way valves are opened to allow the gas to flow freely. When a phase pole needs to be repaired due to gas leakage, the locking nut of the additional one-way valve of the phase is loosened, so that the springs of the two one-way valves are released, and the valve cores are closed to cut off the gas flow between the fault phase and the other two phases, thereby ensuring that the gas of the fault phase does not affect the other two phases. In this way, only the gas recovery and inflation of the fault phase are required, avoiding interference with the non-fault phases.

[0008] According to the exemplary embodiments of the present application, the first one-way valve comprises: a first valve body having a first end and a second end; a first valve core arranged at the first end of the first valve body in the first valve body; and a first return spring, one end of the first return spring abutting against the second end of the first valve body, and the other end of the first return spring abutting against the first valve core; wherein the outer side of the second end of the first valve body is provided with a threaded structure to be connected with the threaded structure of each of the first branch pipeline, the second branch pipeline and the third branch pipeline; the second one-way valve comprises: a second valve body having a first end and a second end; a second valve core arranged at the first end of the second valve body in the second valve body; and a second return spring, one end of the second return spring abutting against the second end of the second valve body, and the other end of the second return spring abutting against the second valve core; wherein a locking nut is arranged on the outer side of the first end of the second valve body, and the locking nut has a threaded structure to be connected with the threaded structure on the outer side of the first end of the first valve body; wherein the first valve core of the first valve body and the second valve core of the second valve body are opposite to each other.

[0009] In this way, the opening and closing of the valve cores of the two one-way valves can be controlled by the relative arrangement of the valve cores of the two one-way valves and the tightening and loosening of the locking nut of the second one-way valve.

[0010] According to the exemplary embodiments of the present application, when the locking nut is tightened, the first return spring and the second return spring are compressed, and the first one-way valve and the second one-way valve are opened; when the locking nut is loosened, the first return spring and the second return spring are released, and the first one-way valve and the second one-way valve are closed.

[0011] In this way, the opening and closing of the first one-way valve and the second one-way valve can be realized by operating the locking nut, and only the gas flow between the fault phase and the other two phases can be cut off, thereby ensuring that the gas of the fault phase does not affect the other two phases. In this way, only the gas recovery and inflation of the fault phase are required, avoiding interference with the non-fault phases.

[0012] According to an exemplary embodiment of the present application, a threaded structure is provided on the outer side of the second end of the second valve body to connect the second end of the second one-way valve to each of the first branch pipeline, the second branch pipeline and the third branch pipeline through a pipeline locking nut.

[0013] In this way, the second one-way valve can be sealed and connected to the branch pipeline through the pipeline locking nut, thereby preventing gas leakage.

[0014] According to an exemplary embodiment of the present application, the circuit breaker further includes a gas sensor, which is connected to the main line through a monitoring line to detect whether there is SF6 gas leakage.

[0015] In this way, one gas sensor can be used to detect SF6 gas leakage, making the structure simple and easy to operate.

[0016] In the embodiment of the present application, the workload caused by repairing gas leakage in the substation can be reduced. At the same time, since the number of times SF6 gas is filled and discharged is reduced, the risk of SF6 gas leakage is reduced, which helps to protect the environment and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 is a schematic diagram of a three-phase circuit breaker according to the prior art.

[0019] Figure 2 is a schematic diagram of a three-phase circuit breaker according to an embodiment of the present application.

[0020] Figure 3 A cross-sectional schematic diagram of a first one-way valve, a second one-way valve, and a pipeline locking nut on a pipeline of a three-phase circuit breaker according to an embodiment of the present application is shown.

[0021] Description of Figure Numbers:

[0022] 10: three-phase circuit breaker;

[0023] 1: Circuit breaker body;

[0024] 2: First one-way valve;

[0025] 3: Second one-way valve;

[0026] 4: Pipe locking nut;

[0027] 20: first valve body;

[0028] 21: first valve core;

[0029] 30: second valve body;

[0030] 31: second valve core;

[0031] 32: second reset spring;

[0032] 33: locking nut;

[0033] L1: first branch pipeline;

[0034] L2: second branch pipeline;

[0035] L3: third branch pipeline;

[0036] LB: main pipeline. DETAILED DESCRIPTION

[0037] In order to better understand the present application by those skilled in the art, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the signals used in this way can be exchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0039] As discussed in the background section, in a three-phase linkage circuit breaker device, when one of the phase poles needs to be repaired due to gas leakage, the conventional method needs to recover the gas of all three phase poles, and then recharge all three phase poles after repair, which cannot recharge only the fault single-phase pole.

[0040] To this end, the utility model discloses the conception is in the original gas pipeline of three -phase circuit breaker, between one -way valve and gas pipeline, increased an additional one -way valve, and the valve core of two valves is opposite to set up, to control the opening and closing of two one -way valves through the locking nut of additional one -way valve, can cut off the gas flow of fault phase pole and the gas flow of remaining two phase poles alone, thereby ensure that the gas of fault phase pole does not affect the other two phase poles. In this way, only need to carry out gas recovery and inflation to fault phase pole, avoid the interference to no -fault phase pole.

[0041] Figure 2 It is the schematic diagram of circuit breaker according to the embodiment of the application. As shown in Figure 2 Three -phase circuit breaker 10 can include: circuit breaker body 1, circuit breaker body 1 can include A phase pole, B phase pole and C phase pole, wherein A phase pole, B phase pole and C phase pole are all filled with SF6 gas, and first branch pipe L1 is connected to A phase pole, second branch pipe L2 is connected to B phase pole, third branch pipe L3 is connected to C phase pole, and main pipe LB, first branch pipe L1, second branch pipe L2 and third branch pipe L3 are all connected to main pipe LB and communicate with each other through main pipe LB, wherein first one -way valve 2 and second one -way valve 3 are arranged on first branch pipe L1, second branch pipe L2 and third branch pipe L3, and first one -way valve 2 and second one -way valve 3 are arranged in opposite directions, that is, the valve core of first one -way valve 2 and the valve core of second one -way valve 3 are opposite to set up. Second one -way valve 3 can include locking nut, and the opposite end of first one -way valve 2 and second one -way valve 3 is connected through locking nut, and the opening and closing of first one -way valve 2 and second one -way valve 3 is controlled through locking nut

[0042] The connection and cooperation configuration of first one -way valve 2 and second one -way valve 3 will be described in detail below. Figure 2 And Figure 3 The connection and cooperation configuration of first one -way valve 2 and second one -way valve 3 will be described in detail below.

[0043] Specifically, as Figure 3As shown in (a), the first one-way valve 2 can include: a first valve body 20 having a first end 20A and a second end 20B; a first valve core 21 arranged in the first valve body 20 at the first end 20A of the first valve body 20; and a first reset spring (not shown), one end of the first reset spring abutting the second end 20B of the first valve body 20, and the other end of the first reset spring abutting the first valve core 21; wherein the outer side of the second end 20B of the first valve body 20 is provided with a threaded structure to be connected with the threaded structure of each of the first branch pipeline L1, the second branch pipeline L2 and the third branch pipeline L3. Wherein, the first one-way valve 2 is a one-way valve commonly used in the art, the structure of which is known to those skilled in the art, and the improvement point of the utility model does not lie in the improvement of the first one-way valve. In order to avoid unnecessary blurring of the improvement point of the present application, the structure of the first one-way valve will not be described here.

[0044] As shown in (a), the first one-way valve 2 can include: a first valve body 20 having a first end 20A and a second end 20B; a first valve core 21 arranged in the first valve body 20 at the first end 20A of the first valve body 20; and a first reset spring (not shown), one end of the first reset spring abutting the second end 20B of the first valve body 20, and the other end of the first reset spring abutting the first valve core 21; wherein the outer side of the second end 20B of the first valve body 20 is provided with a threaded structure to be connected with the threaded structure of each of the first branch pipeline L1, the second branch pipeline L2 and the third branch pipeline L3. Wherein, the first one-way valve 2 is a one-way valve commonly used in the art, the structure of which is known to those skilled in the art, and the improvement point of the utility model does not lie in the improvement of the first one-way valve. In order to avoid unnecessary blurring of the improvement point of the present application, the structure of the first one-way valve will not be described here. Figure 3 As shown in (b), the second one-way valve 3 can include: a second valve body 30 having a first end 30A and a second end 30B; a second valve core 31 arranged in the second valve body 30 at the first end 30A of the second valve body 30; and a second reset spring 32, one end of the second reset spring 32 abutting the second end 30B of the second valve body 30, and the other end of the second reset spring 32 abutting the second valve core 31; and a locking nut 33 arranged on the outer side of the first end 30A of the second valve body 30, the locking nut 33 having a threaded structure to be connected with the threaded structure on the outer side of the first end 20A of the first valve body 20, wherein the first valve core 21 of the first valve body 20 and the second valve core 31 of the second valve body 30 are opposite to each other.

[0045] In embodiments according to the present application, the first one-way valve 2 and the second one-way valve 3 are connected by the locking nut 33, and the opening and closing of the first valve core 21 of the first one-way valve 2 and the second valve core 31 of the second one-way valve 3 are controlled by the locking nut 33, thereby controlling the opening and closing of the first one-way valve and the second one-way valve.

[0046] As an example, in order to enhance the sealed connection of the second one-way valve 3 and the branch pipeline, a pipeline locking nut 4 is provided, as shown in (c). The second end 30B of the second one-way valve 3 is connected with each of the first branch pipeline L1, the second branch pipeline L2 and the third branch pipeline L3 by the pipeline locking nut 4. Figure 3

[0047] ​Specifically, the pipe locking nut 4 is connected with the second valve body 30 through the thread structure 40 and the thread structure arranged on the outer side of the second end 30B of the second valve body 30, and the pipe locking nut 4 is connected with each of the first branch pipe L1, the second branch pipe L2 and the third branch pipe L3 through the thread structure 41, so as to connect the second one-way valve 3 with the corresponding branch pipe.

[0048] Referring again to Figure 2 As Figure 2 shown, the circuit breaker 10 can also include a gas sensor 5 connected to the main pipe LB through the monitoring pipe LS to detect whether SF6 gas leaks. Specifically, the gas sensor 5 can be a density detector, and can include a filling end W1, two one-way valves, a test end W2 and a meter MA.

[0049] The specific operation process of the first one-way valve and the second one-way valve of the circuit breaker according to the embodiments of the present application will be described below.

[0050] When the three-phase circuit breaker is normally operated, after the locking nut 33 and the pipe locking nut 4 are tightened, the reset springs of the first one-way valve 2 and the second one-way valve 3 are compressed, and the first valve core and the second valve core are opened under the action of the reset spring pressure, allowing the gas to pass through. If one of the A-phase pole, the B-phase pole and the C-phase pole has a gas leak, during maintenance, only for the phase where the fault occurs, after the locking nut 33 of the second one-way valve 3 is loosened, the reset spring of the first one-way valve 2 is released, the first valve core is in the closed position, the reset spring of the second one-way valve 3 is released, and the second valve core is in the closed position, at this time, the phase where the fault occurs can be safely removed from the pipe system, and the remaining phases where no fault occurs are not affected. After maintenance, the locking nut 33 of the second one-way valve is tightened again, the gas pipe in the three-phase arc-extinguishing chamber is connected, and only the gas of one phase needs to be supplemented during gassing.

[0051] Therefore, the utility model can only repair and recover the gas of the part where the fault occurs, and perform maintenance work such as gassing again. Since SF6 gas is a gas with strong greenhouse effect, repeated gassing and degassing will inevitably cause a certain amount of leakage, therefore, the three-phase circuit breaker of the present application not only greatly reduces the maintenance workload of the substation, realizes great cost savings, brings economic benefits and environmental protection benefits.

[0052] In the above embodiments of the present application, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0053] In several embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. Among them, the above-mentioned device embodiments are only schematic, for example, the unit or the division of the unit is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or units shown or discussed can be through some interface, indirect coupling or communication connection between units or units, and can be electrical or other forms.

[0054] The unit or unit described as a separate component can or can not be physically separated, and the component shown as a unit or unit can or can not be a physical unit or unit, that is, it can be located in one place, or it can be distributed to a plurality of network units or units. Part or all of the units or units can be selected according to actual needs to achieve the purpose of the embodiment.

[0055] In addition, each functional unit or unit in each embodiment of the present application can be integrated into a processing unit or unit, or each unit or unit can exist physically, or two or more units or units can be integrated into a unit or unit. The above integrated unit or unit can be realized in the form of hardware or in the form of software functional unit or unit.

[0056] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. Three-phase circuit breaker, characterized in that, The three-phase circuit breaker comprises: A circuit breaker body (1), the circuit breaker body (1) comprising an A-phase pole, a B-phase pole and a C-phase pole, wherein the A-phase pole, the B-phase pole and the C-phase pole are all filled with SF6 gas; and A first branch pipeline (L1) is connected to the A-phase pole; A second branch pipeline (L2) is connected to the B-phase pole; A third branch pipeline (L3) is connected to the C-phase pole; and a main line (LB), the first branch line (L1), the second branch line (L2) and the third branch line (L3) are all connected to the main line (LB) and communicate with each other through the main line (LB), The first branch pipeline (L1), the second branch pipeline (L2) and the third branch pipeline (L3) are each provided with a first one-way valve (2) and a second one-way valve (3), and the first one-way valve (2) and the second one-way valve (3) are provided in opposite directions. The second one-way valve (3) includes a locking nut (33), which connects the opposite ends of the first one-way valve (2) and the second one-way valve (3), and controls the opening and closing of the first one-way valve (2) and the second one-way valve (3) through the locking nut (33).

2. The three-phase circuit breaker according to claim 1, characterized in that: The first one-way valve (2) comprises: a first valve body (20) having a first end and a second end; a first valve core (21) disposed in the first valve body (20) at a first end portion of the first valve body (20); and a first return spring, one end of the first return spring abutting against the second end of the first valve body (20), and the other end of the first return spring abutting against the first valve core (21); The outer side of the second end portion of the first valve body (20) is provided with a threaded structure to cooperate with the threaded structure of each of the first branch pipeline (L1), the second branch pipeline (L2) and the third branch pipeline (L3); The second one-way valve (3) further comprises: a second valve body (30) having a first end and a second end; a second valve core (31) disposed in the second valve body (30) at a first end portion of the second valve body (30); and a second return spring (32), one end of the second return spring (32) abuts against the second end of the second valve body (30), and the other end of the second return spring (32) abuts against the second valve core (31), wherein the locking nut (33) is arranged on the outer side of the first end of the second valve body (30), and the locking nut (33) has a threaded structure to cooperate with the threaded structure on the outer side of the first end of the first valve body (20), The first valve core (21) of the first valve body (20) and the second valve core (31) of the second valve body (30) are opposite to each other.

3. The three-phase circuit breaker according to claim 2, characterized in that: When the locking nut (33) is tightened, the first return spring and the second return spring are compressed, and the first one-way valve (2) and the second one-way valve (3) are opened. When the locking nut (33) is loosened, the first return spring and the second return spring are released, and the first one-way valve (2) and the second one-way valve (3) are closed.

4. The three-phase circuit breaker according to claim 2, characterized in that: The outer side of the second end portion of the second valve body (30) is provided with a threaded structure for connecting the second end portion of the second one-way valve (3) to each of the first branch pipeline (L1), the second branch pipeline (L2) and the third branch pipeline (L3) through a pipeline locking nut (4).

5. The three-phase circuit breaker according to any one of claims 1 to 4, characterized in that: Also includes: A gas sensor (5) is connected to the main line (LB) via a monitoring line (LS) to detect whether there is SF6 gas leakage.

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