CN101710552B - Electronic release bracket of electronic low pressure circuit breaker - Google Patents

Abstract

The invention discloses an electronic release bracket for an electronic low-voltage circuit breaker, which is composed of a first bracket with a U-shaped structure, a second bracket and at least two third brackets with an "I"-shaped structure connected left and right. The baffle and the second baffle are respectively connected on both sides of the three brackets; the structure is simple, the assembly is reliable, and the assembly requirements of the three-pole and four-pole circuit breaker electronic release can be easily and flexibly realized; the transformer is completely enveloped in the mutual inductance In the bracket of the circuit breaker, there is sufficient insulation strength with the main circuit of the circuit breaker to ensure the electrical safety of the transformer and completely eliminate potential safety hazards; the components of the electronic trip unit can be completely separated from the main circuit of the circuit breaker to ensure that the electronic trip unit has sufficient Insulation performance; wiring inside the shell, reliable positioning, avoiding potential safety hazards caused by exposed open wires.

Description

An electronic release bracket for an electronic low-voltage circuit breaker

technical field

The invention relates to an electronic release device of an electronic low-voltage circuit breaker, in particular to a bracket for installing the electronic release device.

Background technique

Commonly used low-voltage circuit breakers are power distribution type, motor protection type, residual current protection type and electronic circuit breaker. The electronic low-voltage circuit breaker has the functions of overload long-time delay, short-circuit short-time delay, short-circuit instantaneous and undervoltage protection. It is more comprehensive in function than ordinary thermal magnetic circuit breakers, and it is more reliable and more reliable for power distribution lines and electrical equipment. Comprehensive protection; various functions of the electronic low-voltage circuit breaker are realized by the electronic release, which includes: transformers, circuit boards and actuators, as well as brackets for fixing and connecting the three. Each pole of the circuit breaker has a There is a transformer to detect the current status flowing through the circuit breaker in real time. The transformer converts the large current into a small current signal and sends it to the circuit board. The circuit board processes the signal according to the instructions set by the user, and instructs the actuator to output corresponding actions and signals. .

The transformers of the current electronic circuit breakers are generally directly positioned in the limit slots matched with the base, so there are many limit devices on the base that cooperate with the transformers, which complicates the base; and the transformers have no special protection , the insulation strength of the main circuit of the circuit breaker is not enough, and it is easy to burn the transformer and cause a short circuit between phases in the case of a large current of the circuit breaker; the existing wiring method is that any transformer has a lead wire connected to the circuit board, and a certain number of The connecting wires of the circuit board are exposed outside the circuit board bracket, the wiring is disturbed, and there is no positioning. The wires are easy to be damaged during assembly and are easy to touch the main circuit of the circuit breaker, which has certain potential safety hazards; the existing circuit boards are generally installed directly on the There is no reliable positioning in the bracket of the electronic trip unit, and the insulation strength with the main circuit is not enough, so there are certain potential safety hazards.

Contents of the invention

Aiming at the defects existing in the electronic trip unit of the electronic low-voltage circuit breaker, the present invention provides a support for the electronic trip unit of the electronic low-voltage circuit breaker, which can locate the transformer and the circuit board, and is easy to install and safe and reliable to use. And small size.

The technical solution adopted by the present invention is: it is composed of the first bracket of U-shaped structure, the second bracket and at least two third brackets of "I" structure; The top wall and the bottom wall extending in the same direction are formed, the side wall has a groove matching the shape of the transformer, the end near the side wall has a limit groove, and the top wall has a matching boss and a The limit boss; the bottom wall has a matching groove and the limit boss; the top wall of the second bracket has a matching groove matching the matching boss, and the bottom wall has a matching boss matching the matching groove ; The third bracket has a side wall and a top wall and a bottom wall extending to both sides along the two ends of the side wall. The two ends of the extension of the top wall have a matching boss and a matching groove; the two ends of the bottom wall have a matching boss and a limiting groove.

The beneficial effects of the present invention are:

1. The assembled structural parts of the transformer bracket are simple and reliable in assembly, and can easily and flexibly meet the assembly requirements of three-pole and four-pole circuit breaker electronic trip units.

2. The transformer is completely enclosed in the transformer bracket, and has sufficient insulation strength with the main circuit of the circuit breaker to ensure the electrical safety of the transformer and completely eliminate potential safety hazards.

3. The circuit board is fixed to the transformer bracket with screws, which is easy to install and reliable in positioning.

4. The overall packaged bracket can completely separate the components of the electronic trip unit from the main circuit of the circuit breaker, ensuring sufficient insulation performance of the electronic trip unit.

5. The internal wiring of the shell is reliable in positioning, avoiding potential safety hazards caused by exposed open wires.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a disassembled diagram of the structure of the present invention;

Figure 2 is an exploded view of the structure of Figure 1;

Fig. 3 is an enlarged view of the structure of the first bracket 11 in Fig. 2;

Fig. 4 is the structure enlarged view of the second bracket 12 in Fig. 2;

Fig. 5 is the enlarged view of the structure of the third support 13 in Fig. 2;

Figure 6 is an enlarged view of the structure of the first baffle plate 2 in Figure 2;

Figure 7 is an enlarged view of the structure of the second baffle plate 3 in Figure 2;

In the figure: 11. the first bracket; 111. the side wall; 112. the top wall; 113. the bottom wall; 1111. the groove; 1112. the limit groove; .Matching groove; 1132 limit boss;

12. Second bracket; 121. Side wall; 122. Top wall; 123. Bottom wall; 1221. Matching groove; 1231 Matching boss;

13 third bracket; 131. side wall; 132. top wall; 133. bottom wall; 1311. limit groove; 1321 matching boss; 1322. matching groove; ;

2. The first baffle; 21. Bottom wall; 211. Boss; 212. Through groove; 213. Limiting boss;

3. Second baffle; 31. Bottom wall; 312. Through groove; 313. Fixed boss; 314. Limit boss;

4. Transformer; 5. Circuit board.

Detailed ways:

As shown in Figures 1 and 2, the bracket of the electronic trip unit is composed of a first baffle 2, a second baffle 3, a first bracket 11, a second bracket 12 and at least two third brackets 13. The first baffle 2 and the second baffle 3 are respectively fixed on both sides of the bracket of the electronic trip unit, that is, connected to both sides of the first bracket 11, the second bracket 12 and the third bracket 13, the first baffle 2 and the second baffle 3. Formed by injection molding of plastic materials or other processing methods.

As shown in FIG. 3 , the first bracket 11 is a U-shaped structure formed by a side wall 111 and a top wall 112 and a bottom wall 113 extending in the same direction along both ends of the side wall 111 and having the same length, and a groove 1111 is provided on the side wall 111 , the groove 1111 can be a through groove or a blind groove, and the contour of the groove 1111 matches the outline of the transformer 4 to fix the transformer 4 . There is a limiting groove 1112 near one end of the side wall 111, and the limiting groove 1112 is used for positioning and fixing the first baffle plate 2 to the transformer bracket. A matching boss 1121 and a limiting boss 1122 are provided on the top wall 112 . A fitting groove 1131 and a limiting boss 1132 are formed on the bottom wall 113 . The limiting boss 1122 and the limiting boss 1132 locate and fix the second baffle 3 on the transformer bracket. The second bracket 12 and the third bracket 13 are provided with a matching groove 1221 and a matching boss 1231 matching with the matching protrusion 1121 and the matching groove 1131 of the first bracket 11 to form a concave-convex fit.

As shown in Figure 4, the second bracket 12 is approximately symmetrical to the first bracket 11 in structure, has a side wall 121, a top wall 122 and a bottom wall 123, and is U-shaped. The feature is the same as the corresponding feature on the first bracket 11; the difference is that there is a matching groove 1221 on the top wall 122 and a matching boss 1231 on the bottom wall 123, which matches the matching boss 1121 on the top wall 112 of the first bracket. Correspondingly cooperate with the matching groove 1131 on the bottom wall 113 .

As shown in Fig. 5, the third support 13 has a side wall 131 and a top wall 132 and a bottom wall 133 extending to both sides along the two ends of the side wall 131, so that the third support 13 is an "I" type structure, and the third support 13 13. The two large surfaces of the side wall 131 of the "I" type structure have limit grooves 1311 corresponding to the upper limit grooves on the side walls of the first bracket 11 and the second bracket 12. These two limit grooves 1311 The sum of the depths should be smaller than the thickness of the side walls 131 to ensure that no through grooves are formed. Two ends extending from the top wall 132 have a matching boss 1321 and a matching groove 1322 . Both ends of the bottom wall 133 also have a matching boss 1332 and a limiting groove 1331 . The top wall 132 of the third support 13 and the matching boss and the matching groove on the bottom wall 133 are respectively matched with the matching boss and the matching groove on the top wall and the bottom wall of the first and second brackets 11 and 12 to form Bump fit.

As shown in Figure 6, the first baffle plate 2 has a bottom wall 21 and a boss 211 extending a certain length along the vertical direction of the bottom wall 21, so that the first baffle plate 2 is T-shaped, and a through groove 212 is opened at the boss position of the bottom wall 21 , the size of the through groove should make the boss 211 have a certain wall thickness to ensure the mechanical strength of the boss, so that the boss will not break, and there is a limit boss 213 on both sides of the bottom wall 21. The platform 213 cooperates with the limit groove of the transformer bracket to fix and connect the first baffle plate 2 to the transformer bracket.

As shown in Figure 7, the second baffle 3 has a bottom wall 31 and through grooves 312 distributed on the bottom wall 31. 31 has several fixing bosses 313, and the fixing bosses 313 are used to connect the circuit board 5 to the second baffle plate 3 by screws. There is at least one limiting boss 314 on both sides of the bottom wall 31, which cooperates with the limiting groove on the transformer bracket to fix and connect the second baffle plate 3 to the transformer bracket.

The installation method of the electronic release is as follows: the first and second brackets 11, 12 of the transformer bracket and at least two third brackets 13 envelop the transformer 4 to be connected together in a left and right assembly mode, and the first baffle plate 2 The limit bosses 213 at both ends of the bottom wall 21 match the limit grooves 1112, 1212, 1312 on the transformer bracket to connect the first baffle 2 to the transformer bracket, and the second baffle 3 passes through its bottom wall The limiting bosses 314 at both ends of 31 cross-fit with the limiting bosses 1132, 1232, 1332 on the transformer bracket to connect the first baffle plate 2 to the transformer bracket.

Claims (2)

1. An electronic release bracket of an electronic low-voltage circuit breaker, comprising a first bracket (11) of a U-shaped structure, a second bracket (12) and at least two third brackets (13) of an "I" type structure ) left and right connections; The first bracket (11) is formed by a side wall (111) and a top wall (112) and a bottom wall (113) extending in the same direction along the two ends of the side wall (111) and a bottom wall (113). There is a groove (1111) matching the outline of the device (4), a first limiting groove (1112) near the end of the side wall (111), and a first mating boss (1121) on the top wall (112) and a first limiting boss (1122); the bottom wall (113) has a first matching groove (1131) and a second limiting boss (1132); The top wall (122) of the second bracket (12) has a second matching groove (1221) that matches the first matching boss (1121), and the bottom wall (123) has a second matching groove (1131) that matches the first matching boss (1121). Matching second mating boss (1231); The third bracket (13) has a side wall (131) and a top wall (132) and a bottom wall (133) extending to both sides along the two ends of the side wall (131). There is a second limit groove (1311) corresponding to the upper limit groove on the side wall of the first bracket (11) and the second bracket (12), and the two ends of the extension of the top wall (132) have a third matching boss (1321) and a third matching groove (1322); the bottom wall (133) has a fourth matching boss (1332) and a third limiting groove (1331) at both ends, and is characterized in that: The first baffle plate (2) and the second baffle plate (3) are respectively connected to the both sides of the first support (11), the second support (12) and the third support (13); the first baffle plate (2) has The bottom wall (21) and the boss (211) extending a certain length along its vertical direction, the second baffle plate (3) has the bottom wall (31) and the through grooves (312) distributed thereon, the said through grooves ( 312) matches the boss (211). 2. An electronic release bracket for an electronic low-voltage circuit breaker according to claim 1, characterized in that: the two second limiting grooves ( 1311) is less than the thickness of the sidewall (131).

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