Miniaturized impact-resistant electromagnetic release

Abstract

This invention discloses a miniaturized shock-resistant electromagnetic trip unit, comprising a support assembly and an electromagnet assembly, an adjustment assembly, and an insulated trip rod assembly mounted on the support assembly. The adjustment assembly includes an air gap adjustment assembly for supporting the moving iron core assembly and adjusting the initial position of the moving iron core assembly, a reaction spring adjustment assembly for adjusting the reaction force of the electromagnet assembly, and a reaction torsion spring adjustment assembly for adjusting the reaction force of the trip rod assembly. The miniaturized shock-resistant electromagnetic trip unit of this invention features small size, strong shock and vibration resistance, convenient installation and debugging, and low production cost.

Description

Technical Field

[0001] This invention belongs to the field of switching electrical technology, specifically relating to a miniaturized shock-resistant electromagnetic trip unit. Background Technology

[0002] In applications with special requirements, such as ships and mines, where space is limited, circuit breakers are typically required to be small in size, have high breaking capacity, and possess good impact resistance.

[0003] The electromagnetic trip unit is the core component of the circuit breaker to realize the short circuit protection function. Its working principle is to use a magnetic field to drive the moving iron core to move during a short circuit, thereby triggering the circuit breaker to trip.

[0004] Currently, the market often requires circuit breaker settings to be adjustable over a wide range, resulting in bulky adjustment modules for existing electromagnetic trip units, which occupy a huge amount of space.

[0005] Currently, circuit breakers typically add extra components to the operating mechanism to improve shock resistance, making the operating mechanism structure more complex, installation and commissioning time-consuming and labor-intensive, and increasing production and maintenance costs.

[0006] Therefore, in order to improve the performance of circuit breakers, reduce production costs, and eliminate industry pain points, it is crucial to develop a miniaturized, impact-resistant electromagnetic trip unit. Summary of the Invention

[0007] The purpose of this invention is to fill a current market gap by developing a miniaturized electromagnetic trip unit suitable for use in environments with impact and vibration. This electromagnetic trip unit features small size, strong resistance to impact and vibration, strong insulation performance, convenient installation and debugging, and low production cost.

[0008] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: a miniaturized anti-impact electromagnetic trip unit, comprising a support assembly and an electromagnet assembly, an adjustment assembly, and an insulated trip rod assembly mounted on the support assembly; the electromagnet assembly includes a busbar mounted on the support assembly and a yoke fixedly mounted on the busbar, and also includes a moving iron core assembly rotatably mounted on the support assembly. When the current in the busbar is greater than or equal to the set current, the moving iron core assembly is attracted by the yoke and rotates; the adjustment assembly includes an air gap adjustment assembly for adjusting the initial position of the moving iron core assembly, a reaction spring adjustment assembly for adjusting the reaction force on the electromagnet assembly, and a reaction torsion spring adjustment assembly for adjusting the reaction force on the trip rod assembly; the support assembly includes a base plate and a busbar support member and a mechanism support member disposed on the base plate, the busbar being fixedly mounted on the busbar support member; the trip rod assembly includes a lever with one end located below the moving iron core assembly and the other end movably connected to a connecting rod, the lever being connected to a lever shaft located below the mechanism support member via a clamping member, and the other end of the connecting rod being movably connected to a trip plate for tripping the circuit breaker.

[0009] The miniaturized anti-impact electromagnetic trip device includes an air gap adjustment assembly comprising a spiral rod mounted on a base plate via a nut, and a rubber pad and a metal sheet sequentially arranged on the spiral rod, for adjusting the initial air gap between the moving iron core assembly and the yoke.

[0010] The miniaturized anti-impact electromagnetic trip device includes a reaction spring adjustment assembly for adjusting the force of the reaction spring. The assembly comprises a long screw penetrating a base plate, a trapezoidal block connected to the end of the screw, and an adjustment block abutting against the inclined surface of the trapezoidal block. The adjustment block is connected to the base plate via a locking screw. A reaction spring is positioned above the adjustment block. A graduated indicator is located on the bottom surface of the base plate. The trapezoidal block has a protrusion at its bottom, which, in conjunction with the graduations on the indicator, indicates the adjustment position of the reaction spring. The adjustment block is pressed against the inclined surface of the trapezoidal block by the reaction spring.

[0011] The miniaturized, impact-resistant electromagnetic trip device described herein comprises a long screw, which is a stepped shaft with threads at one end, installed in a corresponding hole in a base plate. One end is axially limited by the base plate, and the other end is screwed into a threaded hole inside a trapezoidal block. The trapezoidal block and the long screw are threaded together. A first and second clamping piece, both U-shaped, are longitudinally inserted into the base plate, directly opposite the stepped shaft. The U-shaped clamping piece is installed in a corresponding groove in the base plate, with the concave portion of the U-shape spanning the thinner section of the stepped shaft of the long screw. The first and second clamping pieces, together with the base plate, restrict the axial displacement of the long screw. A transverse clamping piece parallel to the long screw is also inserted into the base plate. Perpendicular to the first and second clamping plates are clamping screws one and two. The screws of clamping screws one and two pass through the through hole of the first clamping plate and are screwed into the threaded hole of the second clamping plate. When clamping screws one and two are tightened, the first and second clamping plates will clamp the shaft of the long screw, preventing it from rotating. The long screw can rotate to make the trapezoidal block move horizontally, thereby moving the adjusting block up and down, thus changing the initial compression of the reaction spring. After adjustment, clamping screws one, two, and the locking screw are tightened to fix the entire reaction spring adjusting assembly to the base plate, eliminating the influence of external impact vibration.

[0012] The miniaturized anti-impact electromagnetic trip device includes a torsion spring adjustment assembly that comprises a torsion spring sleeved on a lever shaft, and a support member of the torsion spring end connection mechanism.

[0013] The miniaturized anti-impact electromagnetic release device has a pressure plate fixed on its lever shaft. The pressure plate presses against one end of a torsion spring. The pressure plate and the mechanism support are also equipped with an adjusting screw. Rotating the adjusting screw can adjust the angle between the pressure plate and the mechanism support, thereby adjusting the initial compression of the torsion spring.

[0014] The miniaturized anti-impact electromagnetic trip device includes a moving iron core assembly comprising two side steel plates arranged parallel to both sides of the busbar support and a rotating shaft inserted laterally into the busbar support and the two side steel plates. It also includes a silicon steel sheet assembly and a counterweight fixedly installed on the side steel plates. The silicon steel sheet assembly is located below the yoke. A guide pressure plate is movably connected to the side steel plates. The guide pressure plate is connected to a reaction spring adjustment assembly via a reaction spring.

[0015] Compared with existing known technologies, the technical solution provided by this invention has the following significant advantages:

[0016] The miniaturized, shock-resistant electromagnetic trip unit of this invention has the advantage of small size. The spatial layout of the electromagnet assembly and the adjustment assembly is highly overlapping, resulting in a high degree of integration and miniaturizing the entire electromagnetic trip unit, which can meet the design requirements of circuit breaker miniaturization in space-constrained scenarios.

[0017] The miniaturized, shock-resistant electromagnetic trip unit of this invention has extremely strong resistance to shock and vibration, and can be used in equipment such as ships and mines. The electromagnet assembly is statically balanced and will not deflect due to external impact or vibration; the air gap adjustment assembly and the reaction spring adjustment assembly are locked to the support assembly after adjustment, and are completely fixed; the trip rod assembly is made of lightweight materials and, under the constraint of the reaction torsion spring adjustment assembly, will not malfunction due to external shock or vibration.

[0018] The miniaturized, shock-resistant electromagnetic trip unit of this invention has excellent insulation performance. The electromagnet assembly and corresponding adjustment assembly are completely enclosed within the base plate, providing a high degree of isolation. The trip lever assembly is made of insulating material, ensuring the insulation strength between the main circuit and the mechanism. Even when extended to multi-pole applications, the inter-pole insulation strength can be guaranteed by the trip lever assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural composition of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structural composition of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the structural composition of the present invention. Figure 3 ;

[0022] Figure 4 This is a cross-sectional view of the electromagnet assembly of the present invention;

[0023] Figure 5 This is a cross-sectional view of the structure of the adjustment component of the present invention;

[0024] Figure 6 This is a front view of the adjustment component of the present invention.

[0025] The reference numerals in the attached figures are as follows: 1—Electromagnet assembly, 11—Yoke, 12—Moving iron core assembly, 121—Silicon steel sheet assembly, 122—Side steel plate, 123—Rotating shaft, 124—Counterweight, 125—Guide pressure plate, 126—Reaction spring, 13—Busbar, 2—Adjusting assembly, 21—Air gap adjusting assembly, 211—Metal sheet, 212—Rubber pad, 213—Screw rod, 214—Nut, 22—Reaction spring adjusting assembly, 221—Long screw, 222—First clamping plate, 223— Second clamping piece, 224—trapezoidal block, 225—indicator sign, 226—adjusting block, 227—locking screw, 228—clamping piece screw one, 229—clamping piece screw two, 23—reaction torsion spring adjustment assembly, 231—torsion spring, 232—pressure plate, 233—adjusting screw, 3—support assembly, 31—busbar support, 32—mechanism support, 33—base plate, 4—release lever assembly, 41—lever, 42—clamping piece, 43—lever pivot, 44—connecting rod, 45—release plate. Detailed Implementation

[0026] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0027] Reference Figure 1 As shown, this invention discloses a miniaturized, shock-resistant electromagnetic trip unit, comprising an electromagnet assembly 1, an adjustment assembly 2, a support assembly 3, and an insulated trip rod assembly 4. See also... Figure 2 , Figure 3 As shown, the electromagnet assembly 1, the adjustment assembly 2, and the trip lever assembly 4 are mounted on the support assembly 3.

[0028] The electromagnet assembly 1 includes a yoke 11, a moving iron core assembly 12, and a busbar 13. The busbar 13 is mounted on a support assembly 3, the yoke 11 is fixedly mounted on the busbar 13, and the moving iron core assembly 12 is rotatably mounted on the support assembly 3. When the current in the busbar 13 is greater than or equal to the set current, the moving iron core assembly 12 will be attracted by the yoke 11 and rotate. The adjustment assembly 2 includes an air gap adjustment assembly 21, a reaction spring adjustment assembly 22, and a reaction torsion spring adjustment assembly 23. The air gap adjustment assembly 21 is used to adjust the initial position of the moving iron core assembly 12, the reaction spring adjustment assembly 22 is used to adjust the reaction force on the electromagnet assembly 1, and the reaction torsion spring adjustment assembly 23 is used to adjust the reaction force on the trip lever assembly 4.

[0029] The support assembly 3 includes a busbar support 31, a mechanism support 32, and a base plate 33, all of which can be considered as part of the circuit breaker wall panel.

[0030] The trip lever assembly 4 includes a lever 41, a clamping member 42, a lever shaft 43, a connecting rod 44, and a trip plate 45. It transmits the movement of the electromagnet assembly 1 to the trip plate 45, thereby tripping the circuit breaker and completing the function of the electromagnetic trip device. One end of the lever 41 is located below the side steel plate 122 of the moving iron core assembly 12, and the other end is movably connected to the connecting rod 44. The other end of the connecting rod 44 is movably connected to the trip plate 45, which trips the circuit breaker. The clamping member 42 is clamped onto the lever shaft 43, and the lever 41 is fixed to the clamping member 42 with screws. The lever 41 and the lever shaft 43 are linked; they are linked whenever the clamping member 42 clamps the lever. When the clamping member 42 is released, the angle between the lever 41 and the lever shaft 43 can be adjusted.

[0031] The electromagnet assembly 1 and the adjusting assembly 2 have a highly overlapping spatial layout and are highly integrated, giving the entire electromagnetic trip unit a miniaturized feature. The electromagnet assembly 1 is statically balanced and will not deflect due to external impacts or vibrations. The trip rod assembly 4 is made of lightweight materials and, under the constraint of the reaction torsion spring adjusting assembly 23, also possesses corresponding shock and vibration resistance; therefore, the entire electromagnetic trip unit has excellent impact resistance. The trip rod assembly 4 is made of insulating material, thus providing good insulation between the main circuit and the mechanism, making it suitable for medium-voltage circuit breakers.

[0032] Because the trip lever assembly 4 is made of lightweight materials and is constrained by the reaction torsion spring adjustment assembly 23, it also has corresponding shock and vibration resistance; therefore, the entire electromagnetic trip unit has good shock resistance.

[0033] Because the trip rod assembly 4 is made of insulating material, it has good insulation performance between the main circuit and the mechanism, and can be used in medium voltage circuit breakers.

[0034] Reference Figure 2 , Figure 4 As shown, the busbar 13 of the electromagnet assembly 1 is fixedly installed on the busbar support 31, and the moving iron core assembly 12 includes a silicon steel sheet group 121, a side steel plate 122, a rotating shaft 123, a counterweight 124, a guide pressure plate 125, and a reaction spring 126.

[0035] The silicon steel sheet assembly 121 and the counterweight 124 are fixedly installed on the side steel plate 122. The design of the counterweight 124 makes the electromagnet assembly 1 statically balanced. The side steel plate 122 is mounted on the rotating shaft 123 and can rotate with the rotating shaft 123. The rotating shaft 123 is connected to the busbar support 31. The guide pressure plate 125 is mounted in the hole of the side steel plate 122 by a pin or pin shaft and can rotate. One end of the reaction spring 126 is mounted on the guide pressure plate 125, and the other end is mounted on the adjustment block 226 of the reaction spring adjustment assembly 22. When the current in the busbar 13 is greater than or equal to the set current, the moving iron core assembly 12 is attracted and drives the two side steel plates 122 to rotate. The reaction spring 126 is compressed, and the guide pressure plate 125 can rotate adaptively to the pressure of the reaction spring 126, thereby avoiding spring instability.

[0036] Reference Figure 2 , Figure 4 As shown, the air gap adjustment assembly 21 includes a metal sheet 211, a rubber pad 212, a spiral rod 213, and a nut 214, used to support the moving iron core assembly 12 and adjust the initial air gap between it and the yoke 11. The metal sheet 211 is bonded together with the rubber pad 212 and fixedly installed on the top of the spiral rod 213, providing a buffer against the fall of the moving iron core assembly 12. The bottom screw of the spiral rod 213 has a thread that screws into the corresponding threaded hole in the base plate 33. The nut 214 is installed on the spiral rod 213. Because the spiral rod 213 is threadedly connected to the base plate 33, rotating the spiral rod 213 can adjust its height. After adjusting the height, the nut 214 is screwed downwards to press the base plate 33, forming a double-nut structure to lock the spiral rod 213.

[0037] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the reaction spring adjustment assembly 22 includes a long screw 221, a first clamping plate 222, a second clamping plate 223, a trapezoidal block 224, an indicator 225, an adjustment block 226, a locking screw 227, a clamping plate screw one 228 and a clamping plate screw two 229, which are used to adjust the force value of the reaction spring 126.

[0038] The long screw 221 is a stepped shaft with threads at the end, installed in the corresponding hole of the base plate 33. One end is axially limited by the base plate 33, and the other end is screwed into the threaded hole inside the trapezoidal block 224. The first clamping piece 222 and the second clamping piece 223 are both U-shaped and installed in the corresponding groove of the base plate 33. The concave part of the U-shape just spans the thinner section of the stepped shaft of the long screw 221. The first clamping piece 222, the second clamping piece 223 and the base plate 33 together restrict the axial displacement of the long screw 221. The screws of the clamping piece screw 1 228 and the clamping piece screw 229 pass through the through hole of the first clamping piece 222 and are installed on the threaded hole of the second clamping piece 223. When the clamping piece screw 1 228 and the clamping piece screw 229 are tightened, the first clamping piece 222 and the second clamping piece 223 will clamp the shaft section of the long screw 221 from front to back, making it unable to rotate. The trapezoidal block 224 is threadedly engaged with the long screw 221. The indicator plate 225 is fixedly installed at the bottom of the base plate 33. The bottom of the trapezoidal block 224 (or wedge block) has a protrusion that can be used to adjust the gear position of the reaction spring 126 in conjunction with the scale on the indicator plate 225. The adjustment block 226 is pressed against the inclined surface of the trapezoidal block 224 by the reaction spring 126. The locking screw 227 is used to fix the adjustment block 226 to the base plate 33. The long screw 221 can rotate to make the trapezoidal block 224 move horizontally, thereby moving the adjustment block 226 up and down, thus changing the initial compression of the reaction spring 126. After adjustment, tightening the clamping screw 228, clamping screw 229 and locking screw 227 can fix the entire reaction spring adjustment assembly 22 to the base plate 33, eliminating the influence of external impact vibration.

[0039] Reference Figure 1 , Figure 2 and Figure 3 As shown, the reaction torsion spring adjustment assembly 23 includes a torsion spring 231, a pressure plate 232, and an adjusting screw 233, used to adjust the restoring force of the trip lever assembly 4. The torsion spring 231 is sleeved on the lever shaft 43, with one end pressing against the mechanism support 32 and the other end pressing against the pressure plate 232. The pressure plate 232 is fixedly installed on the lever shaft 43. The adjusting screw 233 is installed on one side of the pressure plate 232, with its end pressing against the mechanism support 32. Rotating the adjusting screw 233 can adjust the angle between the pressure plate 232 and the mechanism support 32, thereby adjusting the initial compression of the torsion spring 231.

[0040] The miniaturized, shock-resistant electromagnetic trip unit used in this invention has the following advantages.

[0041] (1) Small size, which can meet the design requirements of miniaturization of circuit breakers in special application scenarios (such as ships, mines, etc.).

[0042] (2) It has strong resistance to impact and vibration and can be used on equipment in environments with impact and vibration.

[0043] (3) It can be adapted to low-voltage or medium-voltage circuit breakers and has good insulation performance.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application examples. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A miniaturized impact-resistant electromagnetic release characterized in that: The system includes a support assembly (3) and an electromagnet assembly (1), an adjustment assembly (2), and an insulated trip lever assembly (4) mounted on the support assembly (3). The electromagnet assembly (1) includes a busbar (13) mounted on the support assembly (3) and a yoke (11) on the busbar (13), and also includes a movable iron core assembly (12) movably mounted on the support assembly (3). The adjustment assembly (2) includes an air gap adjustment assembly (21) for supporting the movable iron core assembly (12) and adjusting the initial position of the movable iron core assembly (12), a reaction spring adjustment assembly (22) for adjusting the reaction force of the electromagnet assembly (1), and an adjustment trip lever assembly (4). 4) Reaction force torsion spring adjustment assembly (23); The support assembly (3) includes a base plate (33) and a busbar support (31) and a mechanism support (32) set on the base plate (33). The busbar (13) is installed on the busbar support (31); The trip lever assembly (4) includes a lever (41) with one end located below the moving iron core assembly (12) and the other end movably connected to the connecting rod (44). The lever (41) is connected to the lever shaft (43) located below the mechanism support (32) through the clamping member (42). The other end of the connecting rod (44) is movably connected to the trip plate (45) that trips the circuit breaker.

2. The miniaturized shock-resistant electromagnetic trip unit according to claim 1, characterized in that, The air gap adjustment assembly (21) includes a screw rod (213) mounted on the base plate (33) by a nut (214) and a rubber pad (212) and a metal sheet (211) arranged sequentially on the screw rod (213).

3. A miniaturized, impact-resistant electromagnetic trip unit according to claim 2, characterized in that, The reaction spring adjustment assembly (22) includes a long screw (221) penetrating the base plate (33), a trapezoidal block (224) connected to the end of the long screw (221), and an adjustment block (226) abutting against the inclined surface of the trapezoidal block (224). The adjustment block (226) is connected to the base plate (33) by a locking screw (227). A reaction spring (126) is provided above the adjustment block (226). A scaled indicator (225) is provided at the bottom of the base plate (33). A protrusion corresponding to the scale is provided at the bottom of the trapezoidal block (224).

4. A miniaturized, shock-resistant electromagnetic trip unit according to claim 3, characterized in that, The long screw (221) is a stepped shaft with threads at the end. The base plate (33) is provided with a first clamping plate (222) and a second clamping plate (223) facing the stepped shaft. The base plate (33) is also provided with a clamping plate screw one (228) and a clamping plate screw two (229) parallel to the long screw (221). The clamping plate screw one (228) and the clamping plate screw two (229) pass through the first clamping plate (222) and are screwed into the second clamping plate (223).

5. A miniaturized, shock-resistant electromagnetic trip unit according to claim 1, characterized in that, The reaction force torsion spring adjustment assembly (23) includes a torsion spring (231) sleeved on the lever shaft (43), and the end of the torsion spring (231) is connected to a support member (32).

6. A miniaturized shock-resistant electromagnetic trip unit according to claim 5, characterized in that, A pressure plate (232) is fixed on the lever shaft (43), and the pressure plate (232) presses against one end of the torsion spring (231). An adjusting screw (233) is provided between the pressure plate (232) and the mechanism support (32).

7. A miniaturized shock-resistant electromagnetic trip unit according to any one of claims 1 to 6, characterized in that, The moving iron core assembly (12) includes side steel plates (122) arranged parallel to both sides of the busbar support (31) and a rotating shaft (123) inserted laterally into the busbar support (31) and the side steel plates (122). It also includes a silicon steel sheet assembly (121) and a counterweight (124) fixed on the side steel plate (122). The silicon steel sheet assembly (121) is located below the yoke (11). A guide pressure plate (125) is movably connected to the side steel plate (122), and the guide pressure plate (125) is connected to a reaction spring (126).

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