A knife-fusing bus duct tapping unit

Abstract

The present invention discloses a knife-fuse bus duct tapping unit, comprising a box body, a knife-fuse switch arranged in the box body, the knife-fuse switch being equipped with a fuse; the box body is provided with an opening for assembling the knife-fuse switch, and the operating handle of the knife-fuse switch protrudes out of the box body; the box body is provided with a socket for connecting the bus duct, and the socket is also connected to the incoming line end of the knife-fuse switch; the box body is of a splicing type. Fuse protection is adopted, when a short circuit occurs, the circuit breaker at the user end does not operate, and the fuse in the tapping unit is melted to cut off the branch line, which does not affect the normal operation of other floors, but reduces electrical fire accidents, and makes the overall protection of the power distribution system more perfect; the box body is provided with a socket for connecting the bus duct, and the tapping unit is convenient to plug in and plug in the bus duct, and the electrical connection is good; the box body is of a splicing type, and the assembly connection structure is easy to produce, and the box body is easy to disassemble and transport.

Description

Technical Field

[0001] The invention relates to a power transmission trunk line distribution device, in particular to a knife-fusing type bus duct tapping unit. Background Art

[0002] Since my country joined the WTO, the economy and modernization have developed rapidly. The quality management of large-scale engineering construction is seriously out of touch. In recent years, there have been more than 100,000 electrical fires in my country each year, accounting for more than 30% of fire accidents. In developed countries, electrical fires account for about 3% of fire accidents. The proportion of electrical fires in my country is 10 times that of developed countries, causing great loss of life and property to the country and the people. The design of building electrical appliances in my country uses the most conservative and advanced products, and the cost of engineering investment is far higher than that of developed countries in Europe and the United States. The fact that there are more electrical fire accidents than in other countries should be worth our consideration.

[0003] In the existing power distribution system, the normal protection functions include overload, short circuit, residual leakage current, undervoltage, lightning, etc. In a normal power distribution system, there are at least three levels of protection from the low-voltage end to the end of the power consumption, and some exceed the six-level protection, such as: high-rise residential buildings, after changing from a 10kV transformer to a 400V low voltage. There is a first-level total frame circuit breaker, the low-voltage distribution room outputs to the floor, and there is another first-level frame or molded case circuit breaker in the distribution room to protect the bus trunk. The bus trunk is branched to each floor, and there is another first-level molded case circuit breaker in the tapping unit branched from the floor. The main switch of the meter box of the floor is another first-level molded case circuit breaker, and there is another first-level miniature circuit breaker from the meter box to the household, and there is another first-level main switch to the household box, and there is another first-level circuit breaker to the power load end. The power supply scheme of the bus duct has a total of seven levels of protection, and the power supply scheme of the cable also has six levels of protection. With so many repeated protections, why are there still many projects where the circuit breakers do not trip when a short circuit occurs, and some directly trip the main switch? There are two reasons for this: project quality supervision is out of control and the design system is unscientific.

[0004] System analysis shows that the main protections of circuit breakers are short-circuit protection and overload protection. Some of them also have undervoltage protection and residual leakage current protection. All protection functions are available in the front of the bus duct. In addition to undervoltage, the back also has the other three protection functions of overload, short-circuit and leakage. Each level has overload and short-circuit protection functions. Therefore, there is no protection in the branch unit when using cables.

[0005] There are many brands of circuit breakers on the market. Many of them can only be used for isolation and do not have overload or short-circuit protection functions. Some good brands have many counterfeits. The low-price winning construction units pursue profit maximization, and the quality supervision is weak. Inferior products have taken advantage of the market. Therefore, the quality of circuit breakers is difficult to guarantee.

[0006] Normal high-quality circuit breakers, the performance of short-circuit protection breaking capacity is far inferior to that of fuses. In Europe, America and developed countries, each power distribution system has one or two levels of fuse protection. With high-breaking fuses in the system, when the circuit breaker does not move when a short circuit occurs, the fuse must be disconnected and cut off, thereby reducing the incidence of electrical fires, making the system configuration more perfect, and the cost of fuses is lower than that of circuit breakers. According to the existing scheme in my country, when all tap units use circuit breakers, when a short circuit occurs, when the tap unit and the end protection devices do not operate, there are two possibilities: the short-circuit current is large enough to trip the main switch; the short-circuit current is not large enough to drive the main switch to operate, especially when the single phase is grounded. If it fails to operate, it will produce sparks for a long time, and the probability of fire accidents caused is very high. The metal shell of the bus duct and the grounding trunk line will generate high voltage to endanger personal safety. The circuit breaker will be stuck and not operate if the short-circuit current is too large, and the current is too small to drive the circuit breaker to operate.

[0007] In the power distribution system, the bus duct is made into a trunk system tapping unit with a built-in circuit breaker, and the cable is made into a trunk system branch using a tapping box without a circuit breaker. This is because there is a meter box on each floor very close to the floor branch. The meter box is equipped with a main switch, which is a circuit breaker with a protection function. The power supply plan of the bus duct also has a meter box on each floor, so the protective device in the bus duct tapping unit is optional.

[0008] In the original scheme, a circuit breaker is set in the tapping unit, which is easy to be stolen. If the user pulls down the circuit breaker of the bus duct tapping unit, the power load line is connected to the outlet of the circuit breaker to steal the power. The original bus duct tapping unit is all protected by a breaker, and the box is used for welding technology. Surface treatment is required after welding, and tinning, pickling, spraying or baking will cause environmental pollution. Summary of the invention

[0009] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a knife-fuse bus duct tapping unit, which adopts fuse protection. When a short circuit occurs, the circuit breaker at the user end does not operate, and the fuse in the tapping unit blows to cut off the branch line, which does not affect the normal operation of other floors, reduces electrical fire accidents, and makes the overall protection of the distribution system more perfect.

[0010] The technical solution adopted by the present invention to solve the technical problem is:

[0011] A knife-fuse bus duct tapping unit comprises a box body, a knife-fuse switch arranged in the box body, the knife-fuse switch is equipped with a fuse; the box body is provided with an opening for assembling the knife-fuse switch, and the operating handle of the knife-fuse switch protrudes out of the box body; the box body is provided with a socket for connecting the bus duct, and the socket is also connected to the incoming line end of the knife-fuse switch; the box body is a spliced ​​type.

[0012] Preferably, the knife-fuse switch is provided with three fuses.

[0013] Preferably, the box body includes two side panels, an upper cover and a lower cover connected to the side panels.

[0014] Preferably, the side plate is provided with a slide groove for clamping the upper cover and the lower cover.

[0015] Preferably, the side panels are made of aluminum alloy by extrusion and drawing.

[0016] Preferably, the upper cover and the lower cover are formed by processing of color-patterned steel plates.

[0017] Preferably, the box body is connected with a support for mounting a knife fuse switch.

[0018] Preferably, the box body is provided with a wire outlet hole.

[0019] Preferably, the outlet hole is connected with a sealing cover for sealing the output cable.

[0020] Preferably, the box body is connected with a handle.

[0021] The present invention adopts a knife-fuse bus duct tapping unit, which has the following beneficial effects: the tapping unit is provided with a knife-fuse switch with a fuse to ensure short-circuit disconnection protection between the main line and the branch, and the branch line will not affect the power supply of the bus duct to other branch lines, so the system safety is more perfect and the fire accidents are effectively reduced; the box is provided with a socket for connecting to the bus duct, and the tapping unit and the bus duct are convenient to plug in and have good electrical connection; the box is assembled, the assembly connection structure is easy to produce, and the box is easy to disassemble and transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 is an exploded view of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the box body of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the side plate and the support member of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the upper cover of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the lower cover of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the knife fuse switch of the present invention;

[0029] Figure 8 It is an exploded schematic diagram of the knife fuse switch of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the cable connection seat of the present invention;

[0031] Fig.10 It is a structural schematic diagram of the fuse of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described below with reference to the accompanying drawings and examples.

[0033] like Figures 1 to 10 As shown, a knife-fuse bus duct tapping unit of the present invention comprises a box body 1, a knife-fuse switch 2 arranged in the box body 1, and the knife-fuse switch 2 is equipped with a fuse 4; the box body 1 is provided with an opening for assembling the knife-fuse switch 2, and the operating handle 22 of the knife-fuse switch 2 protrudes out of the box body 1; the box body 1 is provided with a socket 3 for connecting the bus duct, and the socket 3 is also connected to the incoming line end of the knife-fuse switch 2; the box body 1 is a spliced ​​type.

[0034] The tapping unit is used to connect the bus duct and the branch line, and the knife fuse switch 2 is electrically connected to the bus duct. The operating handle 22 of the knife fuse switch 2 is convexly arranged outside the box 1, that is, the operating handle 22 is exposed outside the box 1, which is convenient for emergency power off and replacement of fuses. The box 1 is provided with an opening for accommodating the knife fuse switch 2, and the opening is used for replacing fuses.

[0035] like Figure 2 and Figure 8 As shown, the knife fuse switch 2 includes a switch body 21 and an operating handle 22 which are hinged to each other. The fuse 4 is arranged on a side of the switch body 21 close to the operating handle 22. The operating handle 22 is opened relative to the switch body 21 to drive the fuse 4 to be exposed. The operating handle 22 is buckled with the fuse 4. The operating handle 22 and the fuse 4 are provided with a buckle structure. The operating handle 22 is opened relative to the switch body 21 to drive the fuse 4 to be separated from the switch body 21.

[0036] A fuse is provided in the fuse 4. When a short circuit occurs, the fuse melts and cuts off the power supply input to the bus duct without affecting the normal operation of other branch lines, thereby making the overall protection of the distribution system more perfect, reducing the occurrence of electrical fires, improving safety performance, and reducing the risk of electric shock.

[0037] The knife-fuse switch 2 is provided with three fuses 4, and the tapping unit is used to connect three-phase electricity.

[0038] like Figure 1 , Figure 2 and Fig. 9As shown, the box body 1 is provided with a socket 3 for connecting the bus duct, and the socket 3 is connected to the box body 1 through a connecting plate, and the socket 3 is also connected to the incoming line end of the knife fuse switch 2. The socket 3 is connected to the bus duct and the knife fuse switch 2 on the inner and outer sides relative to the box body 1, respectively, and the socket 3 is connected to the socket 3 of the knife fuse switch 2 through a wire or a conductive bar. The socket 3 is provided with a socket connector, and the socket 3 and the bus duct can be connected by a socket-pull type; the outer wall support plate of the socket 3 is provided with an opening for connecting to the bus duct by bolts, and the socket 3 and the bus duct can be connected by a fixed type. The socket connector includes a three-phase electrical socket connector, a ground wire socket connector, and a neutral wire socket connector.

[0039] like Figures 2 to 6 As shown, the box body 1 is of a splicing type, which is arranged in parts and the component structure is relatively simple, the process is relatively simple and easy to implement, and the box body 1 is easy to produce; the box body 1 is of a splicing type, which is convenient for the box body 1 to be disassembled and assembled, and convenient for transportation. The box body 1 includes two side panels 11, an upper cover 12 and a lower cover 13 connected to the side panels 11, and the box body 1 is assembled by the two side panels 11, the upper cover 12 and the lower cover 13; during assembly, the two side panels 11 are connected by the upper cover 12 and the lower cover 13. The spliced ​​body of the two side panels 11, the upper cover 12 and the lower cover 13 is provided with a chamber for accommodating the knife fuse switch 2, and the spliced ​​body of the two side panels 11, the upper cover 12 and the lower cover 13 is provided with an opening for accommodating the knife fuse switch 2, and the handle of the knife fuse switch 2 protrudes from the spliced ​​body; the spliced ​​body of the two side panels 11, the upper cover 12 and the lower cover 13 is provided with an opening for assembling the socket 3.

[0040] like Figure 2 and Figure 4 As shown, the side plate 11 is provided with a slide groove 11 a for clamping the upper cover 12 and the lower cover 13 , and the slide groove 11 a is used for positioning and assembling the upper cover 12 and the lower cover 13 .

[0041] The upper cover 12 and the lower cover 13 are connected to the two side plates 11 by bolts, and the upper cover 12 is firmly connected to the two side plates 11. Specifically, the upper cover 12 can be configured as follows: the upper cover 12 is riveted or welded with nuts, and the bolts penetrate the side plates 11, the upper cover 12 and the nuts; the upper cover 12 can also be configured as follows: the upper cover 12 is provided with threaded holes, and the bolts penetrate the side plates 11 and the upper cover 12. The lower cover 13 can be configured as follows: the lower cover 13 is riveted or welded with nuts, and the bolts penetrate the side plates 11, the lower cover 13 and the nuts; the lower cover 13 can also be configured as follows: the lower cover 13 is provided with threaded holes, and the bolts penetrate the side plates 11 and the lower cover 13.

[0042] The side plate 11 can be configured as follows: the side plate 11 is formed by extrusion and drawing of aluminum alloy, and the slide groove 11a is obtained by extrusion and drawing. The side plate 11 can also be configured as follows: the side plate 11 is formed by injection molding of steel.

[0043] The upper cover 12 and the lower cover 13 are formed by processing a color-patterned steel plate, thereby avoiding the surface treatment, spraying and baking paint required for the cover processing, and solving the environmental pollution generated during the processing of the upper cover 12 and the lower cover 13.

[0044] The box body 1 is connected with a support member 14 for mounting the knife fuse switch 2. The support member 14 can be configured as follows: the support member 14 is a positioning bar, fixing bars are provided on both sides of the box body 1, the positioning bar is bolted to the fixing bar, and the knife fuse switch 2 is bolted to the positioning bar. Further, the fixing bar can be a side wall of the chute 11a. The support member 14 can also be configured as follows: the support member 14 includes a horizontal beam and a longitudinal beam, and the longitudinal beam is connected to the inner wall surface of the box body 1 or connected to the fixing bar on the inner wall of the box body 1.

[0045] The box 1 is provided with a ground connection terminal; further, the ground connection terminal is provided on a support member 14. The support member 14 is made of metal, and the knife fuse switch 2 and the ground wire are well connected to the support member 14, ensuring that the housing of the knife fuse switch 2 can be well grounded.

[0046] The box body 1 is connected with a handle 12a; further, the handle 12a is arranged on the upper cover 1212. With the handle 12a, the box body 1 can be carried or transported more conveniently; when the box body 1 is disassembled, the upper cover 12 can also be removed more conveniently.

[0047] The box 1 is provided with an outlet hole, through which the outlet cable of the tapping unit is connected to the outlet terminal of the knife fuse switch 2. Further, the outlet hole is connected with a sealing cover 5 for sealing the output cable. The sealing cover 5 is provided to ensure the internal environment of the box 1 and prevent the box 1 from being damp.

[0048] The above description is not a limitation of the present invention, and the present invention is not limited to the above-mentioned embodiments. As long as changes, modifications, additions or substitutions are made within the essential scope of the present invention, so as to achieve the technical effects of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A knife-melting bus duct tapping unit, characterized in that: The invention comprises a box (1), a knife-fuse switch (2) arranged in the box (1), the knife-fuse switch (2) being equipped with a fuse (4); the box (1) is provided with an opening for assembling the knife-fuse switch (2), and an operating handle (22) of the knife-fuse switch (2) protrudes out of the box (1); the box (1) is provided with a socket (3) for connecting to a bus duct, and the socket (3) is also connected to the incoming line end of the knife-fuse switch (2); the box (1) is of a spliced ​​type, and the knife-fuse switch (2) comprises a hinged The switch body (21) and the operating handle (22) are connected, the fuse (4) is arranged on a side of the switch body (21) close to the operating handle (22), the operating handle (22) is opened relative to the switch body (21) to drive the fuse (4) to be exposed, the operating handle (22) and the fuse (4) are buckled, the operating handle (22) and the fuse (4) are provided with a buckle structure, and the operating handle (22) is opened relative to the switch body (21) to drive the fuse (4) to be separated from the switch body (21), the box body (1) comprises two side panels (11), an upper cover (12) and a lower cover (13) connected to the side panels (11), the side panels (11) are provided with a slide groove (11a) for clamping the upper cover (12) and the lower cover (13), the side panels (11) are formed by extrusion and drawing of an aluminum alloy, the upper cover (12) and the lower cover (13) are formed by processing of a color steel plate, and the box body (1) is connected to a support member (11a) for mounting a knife fuse switch (2) 4), the support member (14) is a positioning bar, fixing bars are arranged on both sides of the box body (1), the positioning bar is connected to the fixing bar by bolts, the knife fuse switch (2) is connected to the positioning bar by bolts, the fixing bar is a side wall of the slide groove (11a), the box body (1) is provided with a ground wire connection terminal, the ground wire connection terminal is arranged on the support member (14), the support member (14) is made of metal, and the knife fuse switch (2) and the ground wire are well connected to the support member (14).

2. A knife-fuse bus duct tapping unit according to claim 1, characterized in that: The knife-fuse switch (2) is provided with three fuses (4).

3. A knife-fuse bus duct tapping unit according to claim 1, characterized in that: The box body (1) is connected to a support member (14) for mounting a knife-fuse switch (2).

4. A knife-fuse bus duct tapping unit according to claim 1, characterized in that: The box body (1) is provided with a wire outlet hole.

5. A knife-fuse bus duct tapping unit according to claim 4, characterized in that: The cable outlet hole is connected to a sealing cover (5) for sealingly sleeve-connecting the output cable.

6. A knife-fuse bus duct tapping unit according to claim 1, characterized in that: The box body (1) is connected to a handle (12a).

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