Composite contact arm of low-temperature-rise circuit breaker

Abstract

The utility model discloses a low temperature rise circuit breaker composite contact arm, which relates to the technical field of circuit breaker parts and comprises a support column, a transverse column is fixedly mounted at the right end of the support column, a composite contact arm assembly is arranged in an inner cavity of the transverse column, and a driving assembly is rotatably connected to the inner cavity of the support column. The lower surface of the supporting column is fixedly provided with a connecting assembly, and the lower part of the connecting assembly is fixedly provided with a low-temperature-rise circuit breaker body. According to the utility model, the push plate is driven to move rightwards through the motor, the gear I and the gear II, and the push plate pushes the conductive column rightwards, so that the composite spring is extruded, the conductive column pushes the contact out of the transverse column, when the current collected by the magnetic sensor is abnormal, the motor rotates reversely, the push plate moves leftwards under the guidance of the guide rod and the through hole, and the contact is pushed out of the transverse column through the elastic force of the composite spring. And the conductive column resets, and the conductive column pulls the contact to reset and retract into the transverse column, so that the contact is pulled out of the contact box to realize resetting, and the automatic power-off function of the circuit breaker is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breaker components, in particular to a low-temperature rise circuit breaker composite contact arm. Background Art

[0002] A low-temperature rise circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain time and disconnect current under specified abnormal circuit conditions. Low-temperature rise circuit breakers are used to distribute electrical energy and protect lines and power equipment from overload, undervoltage, short circuit, etc. Low-temperature rise circuit breakers are widely used in electrical circuits in multiple fields to protect power lines and motors, etc. When they suffer from serious overload or short circuit and undervoltage faults, they can automatically cut off the circuit. Its function is equivalent to a combination of a fuse-type switch and an over- and under-temperature relay. The composite contact arm is an important component of a low-temperature rise circuit breaker.

[0003] The existing technology has the following problems:

[0004] The composite contact arm used in the existing circuit breaker does not have an autonomous power-off function during use, and overly relies on the voltage element set in the circuit breaker to monitor the voltage of the current to trigger the autonomous power-off function, resulting in the contacts on the contact arm being easily burned and scrapped when encountering an overload, causing economic losses and fire safety hazards. At the same time, the existing composite contact arm cannot be quickly installed on the circuit breaker when in use, which is inconvenient to use. Utility Model Content

[0005] The utility model provides a composite contact arm of a low-temperature rise circuit breaker to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A composite contact arm of a low-temperature rise circuit breaker comprises a support column, a cross column is fixedly mounted on the right end of the support column, a composite contact arm assembly is arranged in the inner cavity of the cross column, a driving assembly is rotatably connected to the inner cavity of the support column, a connecting assembly is fixedly mounted on the lower surface of the support column, a low-temperature rise circuit breaker body is fixedly mounted below the connecting assembly, a magnetic sensor is fixedly mounted on the right side of the lower surface of the cross column, and a conductive carbon brush is arranged at the upper position of the left side of the inner cavity of the cross column.

[0008] The composite contact arm assembly includes a contact, the contact is provided with an inner cavity of a horizontal column, a conductive column is fixedly installed on the left end of the contact, and the left end of the conductive column extends to the inner cavity of the support column, and an energized collar is fixedly installed on the left side of the outer surface of the conductive column. The driving assembly includes a screw, and the two ends of the screw are rotatably connected to the left and right sides of the inner cavity of the support column respectively, a gear 2 is fixedly installed on the left side of the outer surface of the screw, a motor is fixedly installed on the right side of the inner cavity of the support column, and the motor is located below the screw, a gear 1 is fixedly installed on the output end of the motor, the upper part of the screw is meshed with the lower part of the gear 2, and the outer surface of the screw is threadedly connected with a push plate.

[0009] The connecting assembly includes a mounting plate and a connecting plate. The upper surface of the mounting plate is fixedly mounted to the lower surface of the support column, and the lower surface of the connecting plate is fixedly mounted to the upper surface of the support column. Threaded holes are provided at the four corners of the upper surface of the connecting plate, and the inner surfaces of the threaded holes are threadedly connected with butterfly screws that pass through the mounting plate.

[0010] Preferably, a limiting ring is fixedly installed on the right side of the inner surface of the transverse column, and the limiting ring is located on the left side of the conductive column.

[0011] Preferably, a composite spring is movably sleeved on the right side of the outer surface of the conductive column, and two ends of the composite spring are respectively fixedly mounted on the right side of the power-carrying ring and the left side of the limiting ring.

[0012] Preferably, T-shaped sliders are fixedly mounted on the front and rear sides of the outer surface of the energized sleeve ring, and T-shaped slide grooves are provided on the front and rear sides of the inner cavity of the horizontal column, and the inner surface of the slide groove is slidably connected to the outer surface of the slider.

[0013] Preferably, a through hole is opened on the upper portion of the left side of the push plate, a guide rod is fixedly installed between the left and right sides of the inner cavity of the support column, and the guide rod is located above the screw rod, and the outer surface of the guide rod is slidably connected to the inner surface of the through hole.

[0014] Preferably, plug blocks are fixedly mounted on the left and right sides of the lower surface of the mounting plate, and slots are provided on the left and right sides of the upper surface of the connecting plate, and the inner surfaces of the slots are plugged into the outer surfaces of the plug blocks.

[0015] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0016] 1. The utility model provides a composite contact arm of a low-temperature rise circuit breaker, which drives a push plate to move right through a motor gear one and a gear two screw, and the push plate pushes the conductive column to the right, so that the composite spring squeezes the composite spring, and the conductive column pushes the contact out of the horizontal column. When the current collected by the magnetic sensor is abnormal, the motor reverses, and under the guidance of the guide rod and the through hole, the push plate moves left, and under the elastic force of the composite spring, the conductive column is reset, and the conductive column pulls the contact to reset and shrink into the horizontal column, so that the contact is pulled out of the contact box to achieve reset, thereby realizing the autonomous power-off function of the circuit breaker, avoiding relying on the voltage element set in the circuit breaker to monitor the current voltage, preventing the contact from burning and scrapping, and avoiding economic losses and fire safety hazards.

[0017] 2. The utility model provides a composite contact arm for a low-temperature rise circuit breaker. The plug block at the bottom of the mounting plate is inserted into the slot, the threaded holes on the mounting plate and the connecting plate are positioned to align them, and then the butterfly screws are rotated to fix the mounting plate and the connecting plate, so that the composite contact arm can be conveniently installed on the low-temperature rise circuit breaker body, achieving quick installation and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0020] Figure 3 It is a cross-sectional schematic diagram of the support column and the horizontal column of the utility model;

[0021] Figure 4 It is a cross-sectional schematic diagram of the support column and the horizontal column of the utility model from another perspective;

[0022] Figure 5 This is a schematic diagram of the structure of the drive assembly of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the composite contact arm assembly of the utility model;

[0024] Figure 7 This is a schematic diagram of the cross-sectional structure of the utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the connection assembly of the utility model;

[0026] Fig. 9 It is a schematic diagram of the exploded structure of the connection component of the utility model.

[0027] In the figure: 1. support column; 2. horizontal column; 3. composite contact arm assembly; 31. contact; 32. conductive column; 33. composite spring; 34. power-carrying ring; 35. slider; 36. limit ring; 4. connecting assembly; 41. mounting plate; 42. threaded hole; 43. butterfly screw; 44. plug-in block; 45. slot; 46. connecting plate; 5. low-temperature rise circuit breaker body; 6. driving assembly; 61. motor; 62. gear one; 63. screw; 64. gear two; 65. push plate; 66. guide rod; 67. through hole; 7. magnetic sensor; 8. conductive carbon brush; 9. slide groove. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] like Figure 1-Figure 9 As shown, a low-temperature rise circuit breaker composite contact arm comprises a support column 1, a cross column 2 is fixedly mounted on the right end of the support column 1, a composite contact arm assembly 3 is arranged in the inner cavity of the cross column 2, a driving assembly 6 is rotatably connected to the inner cavity of the support column 1, and the composite contact arm assembly 3 is reset by setting the driving assembly 6, a connecting assembly 4 is fixedly mounted on the lower surface of the support column 1, a low-temperature rise circuit breaker body 5 is fixedly mounted below the connecting assembly 4, a magnetic sensor 7 is fixedly mounted on the right side of the lower surface of the cross column 2, a conductive carbon brush 8 is arranged at the upper position on the left side of the inner cavity of the cross column 2, and the composite contact arm assembly 3 comprises a contact 31, the contact 31 is arranged in the inner cavity of the cross column 2, a conductive column 32 is fixedly mounted on the left end of the contact 31, and the left end of the conductive column 32 extends to the inner cavity of the support column 1, and a power-on sleeve is fixedly mounted on the left side of the outer surface of the conductive column 32 Ring 34, the driving assembly 6 includes a screw rod 63, the two ends of the screw rod 63 are rotatably connected to the left and right sides of the inner cavity of the support column 1 respectively, a gear 2 64 is fixedly installed on the left side of the outer surface of the screw rod 63, a motor 61 is fixedly installed on the right side of the inner cavity of the support column 1, and the motor 61 is located below the screw rod 63, a gear 1 62 is fixedly installed on the output end of the motor 61, the upper part of the screw rod 63 is meshed with the lower part of the gear 2 64, the outer surface of the screw rod 63 is threadedly connected with a push plate 65, the connecting assembly 4 includes a mounting plate 41 and a connecting plate 46, the upper surface of the mounting plate 41 is fixedly installed with the lower surface of the support column 1, the lower surface of the connecting plate 46 is fixedly installed with the upper surface of the support column 1, and threaded holes 42 are opened at the four corners of the upper surface of the connecting plate 46, and the inner surface of the threaded hole 42 is threadedly connected with a butterfly screw 43 passing through the mounting plate 41.

[0030] Rotate the butterfly screw 43 to fix the mounting plate 41 and the connecting plate 46, so as to facilitate the installation of the composite contact arm on the low temperature rise circuit breaker body 5, and realize quick installation. When in use, the motor 61 rotates forward, and the push plate 65 is driven to move right through the gear 1 62, the gear 2 64, and the screw 63. The push plate 65 pushes the conductive column 32 to the right, and the conductive column 32 pushes the contact 31 out of the horizontal column 2, so that the contact 31 and the contact box are quickly connected. When the current collected by the magnetic sensor 7 is abnormal, the motor 61 is reversed to make the push plate 65 move rightward. The plate 65 moves to the left, so that the conductive column 32 is reset. The conductive column 32 pulls the contact 31 to reset and shrink into the horizontal column 2, thereby pulling the contact 31 out of the contact box to achieve reset, thereby realizing the autonomous power-off function of the circuit breaker, avoiding relying on the voltage element set in the circuit breaker to monitor the voltage of the current, preventing the contact 31 from burning and being scrapped, avoiding economic losses and fire safety hazards, and through the fit between the conductive carbon brush 8 and the energized ring 34, the current is smoothly guided into the low-temperature rise circuit breaker.

[0031] like Figure 2-Figure 4 As shown, a limit ring 36 is fixedly installed on the right side of the inner surface of the horizontal column 2, and the limit ring 36 is located on the left side of the conductive column 32.

[0032] The movement of the energized sleeve 34 is limited by the limiting ring 36 .

[0033] like Figure 2-Figure 4 , Figure 6 As shown, a composite spring 33 is movably sleeved on the right side of the outer surface of the conductive column 32 , and two ends of the composite spring 33 are respectively fixedly mounted on the right side of the power-carrying ring 34 and the left side of the limiting ring 36 .

[0034] The composite spring 33 provides an elastic force to the energized collar 34 , thereby providing a force for resetting the contact 31 .

[0035] like Figure 2-Figure 4 , Figure 6 As shown, T-shaped sliders 35 are fixedly installed on the front and rear sides of the outer surface of the power-carrying ring 34 , and T-shaped slide grooves 9 are opened on the front and rear sides of the inner cavity of the cross column 2 , and the inner surface of the slide groove 9 is slidably connected to the outer surface of the slider 35 .

[0036] Through the sliding cooperation between the slider 35 and the slide groove 9, the movement of the energized collar 34 is limited and guided, thereby realizing the limited guidance of the conductive column 32, and then realizing the limited guidance of the contact 31, ensuring that the contact 31 can move smoothly, avoiding the deviation of the contact 31, eliminating the misalignment friction generated by the contact 31 during docking, and preventing the generation of arcs.

[0037] like Figure 3-Figure 5As shown, a through hole 67 is opened on the upper part of the left side of the push plate 65, and a guide rod 66 is fixedly installed between the left and right sides of the inner cavity of the support column 1, and the guide rod 66 is located above the screw rod 63, and the outer surface of the guide rod 66 is slidably connected to the inner surface of the through hole 67.

[0038] Through the sliding cooperation between the guide rod 66 and the through hole 67 , the movement of the push plate 65 is limited and guided to prevent the push plate 65 from rotating.

[0039] like Figure 8 , Fig. 9 As shown, plug blocks 44 are fixedly installed on the left and right sides of the lower surface of the mounting plate 41 , and slots 45 are opened on the left and right sides of the upper surface of the connecting plate 46 , and the inner surfaces of the slots 45 are plugged into the outer surfaces of the plug blocks 44 .

[0040] Insert the insert block 44 at the bottom of the mounting plate 41 into the slot 45, and position the threaded holes 42 on the mounting plate 41 and the connecting plate 46 so that they are aligned.

[0041] The working principle of the present invention is as follows: insert the plug block 44 at the bottom of the mounting plate 41 into the slot 45, position the threaded holes 42 on the mounting plate 41 and the connecting plate 46, align them, and then rotate the butterfly screw 43 to fix the mounting plate 41 and the connecting plate 46, so as to facilitate the installation of the composite contact arm on the low-temperature rise circuit breaker body 5, and realize quick installation. When in use, the motor 61 rotates forward, and the push plate 65 is driven to move rightward through the gear 1 62, the gear 2 64, and the screw 63, and the push plate 65 pushes the conductive column 32 to the right, so that the composite contact arm is conveniently installed on the low-temperature rise circuit breaker body 5. The closing spring 33 squeezes the composite spring 33, and the conductive column 32 pushes the contact 31 out of the horizontal column 2, so that the contact 31 and the contact box are quickly connected. When the current collected by the magnetic sensor 7 is abnormal, the motor 61 reverses, and under the guidance of the guide rod 66 and the through hole 67, the push plate 65 moves to the left. Under the elastic force of the composite spring 33, the conductive column 32 is reset, and the conductive column 32 pulls the contact 31 to reset and shrink into the horizontal column 2, thereby pulling the contact 31 out of the contact box to achieve reset, thereby realizing the autonomous power-off function of the circuit breaker.

[0042] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A composite contact arm of a low temperature rise circuit breaker, comprising a support column (1), characterized in that: A cross column (2) is fixedly mounted on the right end of the support column (1), a composite contact arm assembly (3) is arranged in the inner cavity of the cross column (2), a driving assembly (6) is rotatably connected to the inner cavity of the support column (1), a connecting assembly (4) is fixedly mounted on the lower surface of the support column (1), a low-temperature rise circuit breaker body (5) is fixedly mounted below the connecting assembly (4), a magnetic sensor (7) is fixedly mounted on the right side of the lower surface of the cross column (2), and a conductive carbon brush (8) is arranged at the upper position of the left side of the inner cavity of the cross column (2); The composite contact arm assembly (3) comprises a contact (31), wherein the contact (31) is provided with an inner cavity of a horizontal column (2), a conductive column (32) is fixedly mounted on the left end of the contact (31), and the left end of the conductive column (32) extends to the inner cavity of the support column (1), and a power-carrying ring (34) is fixedly mounted on the left side of the outer surface of the conductive column (32), and the driving assembly (6) comprises a screw rod (63), and the two ends of the screw rod (63) are respectively connected to the support column (1). The left and right sides of the inner cavity are rotatably connected, a gear 2 (64) is fixedly installed on the left side of the outer surface of the screw rod (63), a motor (61) is fixedly installed on the right side of the inner cavity of the support column (1), and the motor (61) is located below the screw rod (63), and a gear 1 (62) is fixedly installed on the output end of the motor (61), the upper part of the screw rod (63) is meshed with the lower part of the gear 2 (64), and the outer surface of the screw rod (63) is threadedly connected with a push plate (65); The connecting assembly (4) comprises a mounting plate (41) and a connecting plate (46); the upper surface of the mounting plate (41) is fixedly mounted to the lower surface of the support column (1); the lower surface of the connecting plate (46) is fixedly mounted to the upper surface of the support column (1); threaded holes (42) are provided at four corners of the upper surface of the connecting plate (46); the inner surface of the threaded hole (42) is threadedly connected to a butterfly screw (43) passing through the mounting plate (41).

2. A low temperature rise circuit breaker composite contact arm according to claim 1, characterized in that: A limiting ring (36) is fixedly installed on the right side of the inner surface of the transverse column (2), and the limiting ring (36) is located on the left side of the conductive column (32).

3. A low temperature rise circuit breaker composite contact arm according to claim 2, characterized in that: A composite spring (33) is movably sleeved on the right side of the outer surface of the conductive column (32), and two ends of the composite spring (33) are respectively fixedly mounted on the right side of the power supply ring (34) and the left side of the limit ring (36).

4. The low temperature rise circuit breaker composite contact arm according to claim 1, characterized in that: T-shaped sliders (35) are fixedly mounted on the front and rear sides of the outer surface of the power-carrying ring (34), and T-shaped slide grooves (9) are opened on the front and rear sides of the inner cavity of the cross column (2), and the inner surface of the slide groove (9) is slidably connected to the outer surface of the slider (35).

5. The low temperature rise circuit breaker composite contact arm according to claim 1, characterized in that: A through hole (67) is provided on the upper portion of the left side of the push plate (65), and a guide rod (66) is fixedly installed between the left and right sides of the inner cavity of the support column (1), and the guide rod (66) is located above the screw rod (63), and the outer surface of the guide rod (66) is slidably connected to the inner surface of the through hole (67).

6. The low temperature rise circuit breaker composite contact arm according to claim 1, characterized in that: Insertion blocks (44) are fixedly mounted on the left and right sides of the lower surface of the mounting plate (41), and slots (45) are provided on the left and right sides of the upper surface of the connecting plate (46), wherein the inner surface of the slot (45) is plugged into the outer surface of the insertion block (44).

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