Air blowing mechanism for molded case circuit breaker and circuit breaker

Abstract

The present invention relates to an air blowing mechanism for a molded case circuit breaker and a circuit breaker, comprising a bracket, a push rod, a push rod and an elastic reset member, wherein the push rod is rotatably mounted on the bracket, and the elastic reset member is arranged at one end of the push rod; independent air chambers are arranged on the two sides of the bracket, and the two air chambers are not connected to each other, and the push rod is slidably arranged in the air chamber, and the end of the push rod passes through the side of the air chamber and abuts against the other end of the push rod; in a normal state, the push rod presses the push rod back into the air chamber under the action of the elastic reset member; when a large breaking current occurs, high-pressure gas enters the air chamber to push the push rod out, and the push rod pushes the push rod to overcome the action of the elastic reset member, so that the push rod rotates. The air blowing mechanism is small in size, thin in thickness, simple in structure, and easy to install, and can be installed in a compact frame circuit breaker.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to an air blowing mechanism for a molded case circuit breaker and the circuit breaker. Background Art

[0002] The air blowing mechanism is mainly used in molded case circuit breakers with enclosed contact arc extinguishing modules. When the circuit generates a breaking current, high-pressure gas will be generated in the enclosed arc extinguishing module, which will drive the air blowing mechanism to trip and disintegrate the circuit breaker mechanism, thereby disconnecting the circuit, which can help improve the breaking capacity of the circuit breaker.

[0003] At present, due to the compact structure and small space of 63A frame molded case circuit breakers on the market, none of the 63A frame molded case circuit breakers on the market have the air blowing function, and the existing air blowing mechanism is difficult to meet the assembly requirements. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problem and to provide an air blowing mechanism and a circuit breaker for a molded case circuit breaker. The air blowing mechanism is small in size, thin in thickness, simple in structure, and easy to install. It can be installed in a compact 63A frame circuit breaker, providing the possibility for the 63A frame molded case circuit breaker to realize the air blowing function.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A gas blowing mechanism for a molded case circuit breaker comprises a bracket, a push rod, a push rod and an elastic reset member, wherein the push rod is rotatably mounted on the bracket, and the elastic reset member is arranged at one end of the push rod; independent air chambers are respectively arranged on the two side surfaces of the bracket, and the two air chambers are not connected to each other, and the push rod is slidably arranged in the air chamber, and the end of the push rod passes through the side of the air chamber and abuts against the other end of the push rod; in a normal state, the push rod presses the push rod back into the air chamber under the action of the elastic reset member; when a large breaking current occurs, high-pressure gas enters the air chamber to push the push rod out, and the push rod pushes the push rod to overcome the action of the elastic reset member, so that the push rod rotates.

[0007] Furthermore, the push rod is in the shape of a long rod, a fixed shaft is provided on the bracket, a rotating hole is provided in the middle of the push rod, the fixed shaft passes through the rotating hole, and the push rod rotates around the fixed shaft.

[0008] Furthermore, the air chamber is formed by providing an inner groove on the side of the bracket, and an opening for the push rod to slide out is provided on the outer side of the air chamber.

[0009] Furthermore, a guide groove is provided inside the air chamber, the push rod is matched with the guide groove, and the push rod slides freely along the guide groove.

[0010] Furthermore, the air chambers on both sides of the bracket are distributed up and down.

[0011] Furthermore, the air chamber is in a "convex" shape, the narrow portion of the "convex" shape is arranged corresponding to the air outlet hole of the circuit breaker arc extinguishing module housing, and the push rod is located at the wide portion of the "convex" shape.

[0012] Furthermore, the push rod includes a slider moving portion and a blocking rod connected thereto, and the blocking rod passes through the opening and is pressed against the push rod.

[0013] Furthermore, the elastic reset member is a reset spring, one end of the spring is connected to the hole of the push rod, and the other end is connected to the fixing hole of the support seat of the circuit breaker.

[0014] A circuit breaker is provided with the above-mentioned air blowing mechanism, wherein the air blowing mechanism is installed between two adjacent arc extinguishing module shells in the circuit breaker, the bracket is inserted into the positioning hole of the arc extinguishing module shell, the air outlet hole on the arc extinguishing module shell is opposite to the air chamber, one end of the elastic reset member is connected to the push rod, and the other end is connected to the fixing hole of the circuit breaker support seat, and the upper end of the push rod is arranged corresponding to the tripping axis of the circuit breaker.

[0015] The working principle of the air blowing mechanism of the present invention is that after the air blowing mechanism is installed in the circuit breaker, under the action of the elastic reset member (spring), the lower part of the push rod presses the push rod back into the air chamber, and the two push rods in the bracket are in the retracted position; when a large interrupting current appears in the circuit, a large amount of gas will be generated in the arc extinguishing chamber of each phase.

[0016] The high-pressure gas in the arc extinguishing chambers on the left and right sides of the air-blowing mechanism will pass through the holes in the arc extinguishing module shell and enter the two independent air chambers on the left and right sides of the bracket, thereby pushing the push rod in the corresponding air chamber, so that the push rod is pushed out along the slide of the bracket, and the end of the push rod leaks out of the bracket, and pushes the push rod to overcome the force of the elastic reset part and rotate, so that the upper part of the push rod pushes the tripping shaft of the circuit breaker mechanism, so that the entire mechanism is tripped and disintegrated, causing the circuit breaker to trip and disconnect the entire circuit, thereby playing a protective role.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) Simple structure, few parts, simple assembly, and good processability: The present invention forms an air blowing mechanism through only four components: a bracket, a push rod, a push rod, and an elastic reset member. The connection relationship between the components is relatively simple, and an effective air blowing release function can be achieved.

[0019] (2) Small size and thin thickness. Two independent air chambers are respectively arranged on both sides of the bracket, which cooperate with the arc extinguishing module shells on both sides, effectively reducing the thickness and volume. It can be installed in a compact 63A frame circuit breaker, providing the possibility for the 63A frame molded case circuit breaker to realize the air blowing function.

[0020] (3) Two independent air chambers are insulated from each other and are equipped with two push rods respectively, which play the air blowing function of the two adjacent phases without interfering with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 , 2 It is a structural schematic diagram of the front and back sides of the air blowing mechanism of an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a bracket according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic structural diagram of a top rod according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of an arc extinguishing module housing A according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the arc extinguishing module housing B according to an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the assembly of the air blowing mechanism and the arc extinguishing module housing according to an embodiment of the present invention;

[0027] Figure 8 , 9 10 is a schematic diagram of an air blowing mechanism installed in a circuit breaker according to an embodiment of the present invention;

[0028] In the figure: 1-elastic reset member, 2-push rod, 3-bracket, 301-fixed shaft, 302-air chamber, 303-opening, 4-top rod, 401-slider moving part, 402-resistance rod, 5-arc extinguishing module housing A, 501-air outlet, 6-arc extinguishing module housing B, 601-air outlet, 7-support seat, 8-tripping shaft, 9-circuit breaker body, 901-base. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example

[0031] like Figure 1 , 2, an air blowing mechanism for a molded case circuit breaker, comprising a bracket 3, a push rod 2, a push rod 4 and an elastic reset member 1, wherein the push rod 2 is in the shape of a long rod, a fixed shaft 301 is provided on the bracket 3, a rotating hole is provided in the middle of the push rod 2, the fixed shaft 301 passes through the rotating hole, the push rod 2 is rotatably mounted on the bracket 3, and the push rod 2 can rotate around the fixed shaft 301. The elastic reset member 1 is provided at the upper end of the push rod 2, and the elastic reset member 1 is a reset spring, one end of the spring is connected to the hole of the push rod 2, and the other end is connected to the fixed hole of the support seat of the circuit breaker.

[0032] like Figure 3 , two sides of the bracket 3 are provided with independent air chambers 302, the two air chambers 302 are not connected to each other, and the air chambers 302 on the two sides of the bracket 3 are distributed up and down. The air chamber 302 is formed by opening an inner groove on the side of the bracket 3, and an opening 303 for the push rod 4 to slide out is provided on the outside of the air chamber 302. A guide groove is provided on the inside of the air chamber 302, and the push rod 4 is matched with the guide groove, and the push rod 4 slides freely along the guide groove.

[0033] Specifically, the air chamber 302 is convex, the narrow part of the convex shape is arranged corresponding to the air outlet of the arc extinguishing module housing of the circuit breaker, and the push rod 4 is located at the wide part of the convex shape. The push rod 4 is slidably arranged in the air chamber 302, and the end of the push rod 4 passes through the side of the air chamber 302 and abuts against the other end of the push rod 2.

[0034] like Figure 4 The push rod 4 includes a slider moving portion 401 and a blocking rod 402 connected thereto, and the blocking rod 402 passes through the opening 303 and is pressed against the push rod 2.

[0035] In the normal state, the push rod 2 presses the push rod 4 back into the air chamber 302 under the action of the elastic reset member 1; when a large breaking current occurs, the high-pressure gas enters the air chamber 302 to push the push rod 4 out, and the push rod 4 pushes the push rod 2 to overcome the force of the elastic reset member 1, causing the push rod 2 to rotate.

[0036] The air blowing mechanism is specifically used in a circuit breaker. The air blowing mechanism is installed between two adjacent arc extinguishing module housings in the circuit breaker 9. Figure 5 , 6 The two adjacent arc extinguishing module shells are arc extinguishing module shell A5 and arc extinguishing module shell B6, and the shells are respectively provided with air outlet holes 501 and air outlet holes 601. Figure 8 , 9 The air blowing mechanism is installed in the base 901 of the circuit breaker 9, the bracket 3 is inserted into the positioning hole of the arc extinguishing module housing, the air outlet holes 501, 601 on the arc extinguishing module housing are opposite to the air chamber 302, one end of the elastic reset member 1 is connected to the push rod 2, and the other end is connected to the fixing hole of the circuit breaker support seat 7, and the upper end of the push rod 2 is corresponding to the tripping shaft 8 of the circuit breaker. Fig.10 This is a schematic diagram of the air blowing mechanism being installed as a whole in the circuit breaker.

[0037] The specific working process is that after the air blowing mechanism is installed in the circuit breaker, under the action of the elastic reset member 1, the lower part of the push rod 2 presses the push rod 4 back into the air chamber, and the two push rods 4 in the bracket 3 are in the retracted position; when a large breaking current appears in the circuit, a large amount of gas will be generated in the arc extinguishing chamber of each phase. The high-pressure gas in the arc extinguishing chamber on the left and right sides of the air blowing mechanism will pass through the air outlet of the arc extinguishing module shell and enter the two independent air chambers 302 on the left and right sides of the bracket 3, thereby pushing the push rod 4 in the corresponding air chamber, so that the push rod 4 is pushed out along the slide of the bracket 3, and the end of the push rod 4 leaks out of the bracket 3, and pushes the push rod 2 to overcome the force of the elastic reset member 1 and rotate, so that the upper part of the push rod 2 pushes the tripping shaft 8 of the circuit breaker mechanism, so that the entire mechanism is tripped and disintegrated, and the circuit breaker trips to disconnect the entire circuit, which plays a protective role.

[0038] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An air blowing mechanism for a molded case circuit breaker, characterized in that: It comprises a bracket (3), a push rod (2), a push rod (4) and an elastic reset member (1), wherein the push rod (2) is rotatably mounted on the bracket (3), and the elastic reset member (1) is arranged at one end of the push rod (2); Independent air chambers (302) are respectively provided on the two side surfaces of the bracket (3), the two air chambers (302) are not connected to each other, the push rod (4) is slidably arranged in the air chamber (302), the end of the push rod (4) passes through the side of the air chamber (302) and abuts against the other end of the push rod (2); the air chamber (302) is formed by providing an inner groove on the side surface of the bracket (3), and an opening (303) for the push rod (4) to slide out is provided on the outer side of the air chamber (302); the air chambers (302) on the two side surfaces of the bracket (3) are distributed up and down; the air chamber (302) is "convex", the narrow part of the "convex" shape is arranged corresponding to the air outlet of the arc extinguishing module housing of the circuit breaker, and the push rod (4) is located at the wide part of the "convex" shape; In a normal state, the push rod (2) presses the push rod (4) back into the air chamber (302) under the action of the elastic return member (1); when a large breaking current occurs, high-pressure gas enters the air chamber (302) to push the push rod (4) out, and the push rod (4) pushes the push rod (2) to overcome the action force of the elastic return member (1), causing the push rod (2) to rotate.

2. The air blowing mechanism for a molded case circuit breaker according to claim 1, characterized in that: The push rod (2) is in the shape of a long rod. A fixed shaft (301) is provided on the bracket (3). A rotating hole is provided in the middle of the push rod (2). The fixed shaft (301) passes through the rotating hole. The push rod (2) rotates around the fixed shaft (301).

3. The air blowing mechanism for a molded case circuit breaker according to claim 1, characterized in that: A guide groove is provided on the inner side of the air chamber (302), the push rod (4) is matched with the guide groove, and the push rod (4) slides freely along the guide groove.

4. The air blowing mechanism for a molded case circuit breaker according to claim 1, characterized in that: The push rod (4) comprises a slider moving portion (401) and a blocking rod (402) connected thereto, and the blocking rod (402) passes through the opening (303) and is pressed against the push rod (2).

5. The air blowing mechanism for a molded case circuit breaker according to claim 1, characterized in that: The elastic reset element (1) is a reset spring, one end of which is connected to the hole of the push rod (2), and the other end of which is connected to the fixing hole of the support seat of the circuit breaker.

6. A circuit breaker, characterized in that: With an air blowing mechanism as described in any one of claims 1-5.

7. A circuit breaker according to claim 6, characterized in that: The air blowing mechanism is installed between two adjacent arc extinguishing module housings in the circuit breaker (9); the bracket (3) is inserted into the positioning hole of the arc extinguishing module housing; the air outlet hole on the arc extinguishing module housing is opposite to the air chamber (302); one end of the elastic reset member (1) is connected to the push rod (2) and the other end is connected to the fixing hole of the circuit breaker support seat (7); the upper end of the push rod (2) is arranged corresponding to the tripping shaft (8) of the circuit breaker.

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