Adjustable thermomagnetic tripping structure

Abstract

The utility model relates to the field of circuit breaker tripping structures, in particular to an adjustable thermomagnetic tripping structure. Comprising a base, a moving contact mechanism is installed in the base, and the moving contact mechanism comprises a traction rod; the magnet mounting seat is mounted in the base, and an electromagnet is arranged in the magnet mounting seat; the armature is hinged to the magnet mounting base, and one end of the armature can abut against and be matched with the traction rod; the bimetallic strip is arranged on the magnet mounting base, and one end of the bimetallic strip can abut against and be matched with the traction rod; the adjusting seat is fixedly arranged on the base; the instantaneous adjusting rod is rotationally connected to the adjusting seat and comprises a rod body, an abutting part and an adjusting part, and the abutting part in abutting fit with the armature is arranged on the rod body; the resetting mechanism is used for resetting the instantaneous adjusting rod; the instantaneous adjusting knob is rotationally connected to the adjusting seat, one end of the instantaneous adjusting knob is provided with a plurality of continuous step-shaped adjusting planes, the adjusting parts abut against the adjusting planes, and inclined planes are arranged between the adjacent adjusting planes; according to the utility model, the short-circuit protection circuit value of the circuit breaker can be adjusted.

Description

Technical Field

[0001] The utility model relates to the field of circuit breaker tripping structures, and particularly to an adjustable thermal-magnetic tripping structure. Background Art

[0002] In a circuit breaker, a bimetal and an armature are two important components. They work together through thermal tripping and electromagnetic tripping mechanisms to ensure that the circuit breaker can effectively protect the circuit from faults such as overload and short circuit. Their cooperation enables the circuit breaker to provide overload protection (through the bimetal) and short circuit protection (through the armature).

[0003] When the current is overloaded, the bimetal will expand due to the continuous increase in current and heat, bend and push the contact to trip, disconnecting the circuit. Since thermal tripping is a time-delayed action, when the current is slightly higher than the rated value, the circuit breaker will have a certain delay to avoid cutting off the circuit due to a short-term small overload; but if the overload lasts for a long time, the bimetal will trigger the trip protection.

[0004] When a short circuit occurs in the current, due to the instantaneous increase in current, the electromagnetic coil in the electromagnetic release will quickly generate a strong magnetic field, quickly attract the armature, trigger the tripping mechanism, and immediately cut off the circuit. Different from the bimetal, electromagnetic protection is instantaneous, and it will act in an extremely short time to avoid damage to the circuit by the short-circuit current.

[0005] In many circuit breakers, the short-circuit protection circuit value of the armature is fixed and non-adjustable, and the overload protection adjusts the delay time by adjusting the sensitivity of the bimetal, and the circuit threshold is not intuitive.

[0006] Therefore, there is an urgent need to provide an improved technical solution to solve the above technical problems. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a technical effect of an adjustable thermal-magnetic tripping structure that can adjust the protection current threshold for the above-mentioned existing technical problems.

[0008] In view of this, the utility model provides an adjustable thermal-magnetic tripping structure, including:

[0009] A base, in which a moving contact mechanism is installed, and the moving contact mechanism includes a traction rod;

[0010] A magnet mount, which is installed in the base and has an electromagnet inside;

[0011] An armature, which is hinged to the magnet mount, and one end can be in contact and cooperate with the traction rod;

[0012] A bimetal, which is arranged on the magnet mount, and one end can be in contact and cooperate with the traction rod;

[0013] Adjusting base, which is fixedly arranged on the base;

[0014] Instantaneous adjusting rod, which is rotatably connected to the adjusting base, including: rod body, abutting part and adjusting part, and the rod body is provided with an abutting part that abuts and cooperates with the armature;

[0015] Reset mechanism, which is used to reset the instantaneous adjusting rod;

[0016] Instantaneous adjusting knob, which is rotatably connected to the adjusting base, and one end is provided with a number of continuous stepped adjusting planes, the adjusting part abuts against the adjusting plane, and an inclined plane is provided between adjacent adjusting planes.

[0017] Further, the reset mechanism includes:

[0018] Spring hanging rod, which is fixedly arranged on the rod body;

[0019] Spring sleeve rod, which is fixedly connected to the adjusting base;

[0020] Reset spring, one end of which is hung on the spring hanging rod, and the other end is sleeved on the spring sleeve rod.

[0021] Further, it further includes:

[0022] Delay mechanism, which includes:

[0023] Delay contact rod, which is slidably arranged on the moving contact head and is provided with an inclined surface, and the end of the bimetallic strip can abut and cooperate with the inclined surface of the delay contact rod;

[0024] Moving rod, one end of which is fixedly connected to the delay contact rod, and the other end is provided with a moving groove;

[0025] Delay adjusting knob, which is rotatably connected to the adjusting base, and an eccentric rod is provided at the end, and the eccentric rod is inserted into the moving groove.

[0026] Further, the traction rod is provided with a sliding groove, and an installation groove with a width greater than that of the sliding groove is arranged at one end of the sliding groove. The delay contact rod is provided with a sliding rod, and a first limiting part is arranged at the end of the sliding rod. The width of the limiting part is smaller than the installation groove and greater than the sliding groove.

[0027] Further, a second limiting part is arranged on the periphery of the delay adjusting knob, and a third limiting part that is limited and cooperated with the second limiting part is arranged on the adjusting base.

[0028] Further, it further includes:

[0029] Delay screw, which is threadedly connected to one end of the bimetallic strip, and a slotted head is provided at one end, and the other end abuts against the inclined surface.

[0030] The beneficial effects of the present utility model are as follows:

[0031] 1. In the present utility model, the adjusting part can move on different adjusting platforms. The instantaneous adjusting rod can be rotated to lower or raise the position of the abutting part, thereby adjusting the distance between the armature and the electromagnet, and thus adjusting the short-circuit protection circuit value of the circuit breaker.

[0032] 2. The cooperation between the eccentric rod and the moving groove in the present utility model enables the delay contact rod to slide, so that different positions of the inclined surface correspond to the end of the bimetal sheet, thereby changing the distance between the bimetal sheet and the inclined surface, and thus changing the delay time or the magnitude of the overload current. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG. is a schematic structural diagram of a circuit breaker including the utility model;

[0034] Figure 2 is Figure 1 A perspective structural diagram of the circuit breaker without a base including the present utility model in the A area of FIG.;

[0035] Figure 3 A three-dimensional structural diagram of the present utility model;

[0036] Figure 4 A structural diagram of the instantaneous adjusting rod of the present utility model;

[0037] Figure 5 A structural diagram of the cooperation between the instantaneous adjusting rod and the instantaneous adjusting knob of the present utility model;

[0038] Figure 6 A structural diagram of the cooperation between the moving rod and the delay adjusting knob of the present utility model;

[0039] Figure 7 A structural diagram of the armature and the magnet mounting seat of the present utility model;

[0040] Figure 8 is Figure 1 A structural diagram of the circuit breaker including the present utility model in the A area of FIG.

[0041] The marks in the figure are shown as:

[0042] 1. Base; 2. Tractive rod; 3. Magnet mounting seat; 4. Armature; 5. Bimetallic strip; 6. Adjusting seat; 7. Instantaneous adjusting rod; 8. Rod body; 9. Contact part; 10. Adjusting part; 11. Instantaneous adjusting knob; 12. Adjusting plane; 13. Spring hanging rod; 14. Spring sleeve rod; 16. Delay contact rod; 17. Moving rod; 18. Inclined plane; 19. Moving groove; 20. Sliding groove; 21. Mounting groove; 22. First limiting part; 23. Second limiting part; 24. Third limiting part; 25. Delay screw; 26. Eccentric rod; 27. Sliding rod; 28. Delay adjusting knob. Detailed implementation mode

[0043] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0044] Embodiment 1:

[0045] This embodiment provides an adjustable thermomagnetic tripping structure, including:

[0046] A moving contact mechanism is installed in the base 1, and the moving contact mechanism includes a tractive rod 2;

[0047] A magnet mounting seat 3, the magnet mounting seat 3 is installed in the base 1 and an electromagnet is provided inside;

[0048] An armature 4, the armature 4 is hinged on the magnet mounting seat 3, and one end can be in contact and cooperation with the tractive rod 2;

[0049] A bimetallic strip 5, the bimetallic strip 5 is arranged on the magnet mounting seat 3, and one end can be in contact and cooperation with the tractive rod 2;

[0050] An adjusting seat 6, the adjusting seat 6 is fixedly arranged on the base 1;

[0051] An instantaneous adjusting rod 7, the instantaneous adjusting rod 7 is rotatably connected to the adjusting seat 6, including: a rod body 8, a contact part 9 and an adjusting part 10, and a contact part 9 for contacting and cooperating with the armature 4 is provided on the rod body 8;

[0052] A reset mechanism, the reset mechanism is used to reset the instantaneous adjusting rod 7;

[0053] An instantaneous adjusting knob 11, the instantaneous adjusting knob 11 is rotatably connected to the adjusting seat 6, and a number of continuous stepped adjusting planes 12 are provided at one end, the adjusting part 10 abuts against the adjusting plane 12, and an inclined plane is provided between adjacent adjusting planes 12.

[0054] A moving contact mechanism is fixedly installed inside the base 1. The moving contact mechanism includes a traction rod 2. When the traction rod 2 is toggled, the moving contact mechanism will complete the power-off action. The magnet mounting base 3 is fixedly installed on the base 1, and the magnet mounting base 3 is cooperatively connected with the terminal block, and the electromagnet is electrically connected to the terminal block. One side of the magnet mounting base 3 is provided with a semi-circular hinge groove. The armature 4 is provided with a hinge portion that cooperates with the hinge groove, and convex portions are provided on both sides of one end of the armature 4. A groove that cooperates with the convex portion is provided on the side wall of the magnet mounting base 3. The convex portion of the armature 4 can swing in the groove of the magnet mounting base 3, so that the armature 4 can swing around the hinge portion. The other end of the armature 4 is provided with a tip for touching the traction rod 2. When a short circuit occurs, the electromagnet works to attract the armature 4, causing the armature 4 to rotate. The tip abuts against the traction rod 2, causing the traction rod 2 to rotate, so that the moving contact mechanism completes the power-off.

[0055] When an overload occurs, one end of the bimetal 5 bends upward and abuts against the traction rod 2 to cause the traction rod 2 to rotate, so that the moving contact mechanism completes the power-off.

[0056] The adjusting seat 6 is fixedly connected to the base 1. An instantaneous adjusting rod 7 is rotatably connected to the adjusting seat 6. A contact portion 9 is provided on the rod body 8 of the instantaneous adjusting rod 7 and is in abutting cooperation with the armature 4. The instantaneous adjusting knob 11 is rotatably connected to the adjusting seat 6. A slotted crosshead for rotating the instantaneous adjusting rod 7 is provided at one end of the instantaneous adjusting rod 7. A plurality of stepped adjusting platforms are provided at the other end of the instantaneous adjusting rod 7. The reset mechanism can be a torsion spring sleeved on one end of the rod body 8. The torsion spring drives the rod body 8 to rotate clockwise, so that the adjusting portion 10 and the adjusting plane 12 are always in abutment. By rotating the instantaneous adjusting knob 11, the adjusting portion 10 moves on different adjusting platforms, and the instantaneous adjusting rod 7 can be rotated to lower or raise the position of the contact portion 9, thereby adjusting the distance between the armature 4 and the electromagnet, and thus adjusting the short-circuit protection circuit value of the circuit breaker.

[0057] Embodiment 2:

[0058] This embodiment provides an adjustable thermal-magnetic trip structure, which, in addition to including the technical solutions of the above embodiment, further has the following technical features.

[0059] The reset mechanism includes:

[0060] A spring hanging rod 13, the spring hanging rod 13 is fixedly arranged on the rod body 8;

[0061] A spring sleeve rod 14, the spring sleeve rod 14 is fixedly connected to the adjusting seat 6;

[0062] A reset spring, one end of the reset spring is hung on the spring hanging rod 13, and the other end is sleeved on the spring sleeve rod 14.

[0063] One end of the spring hanging rod 13 is fixedly arranged on the rod body 8, and the other end is provided with a semi-circular groove for conveniently hanging the return spring. One end of the spring sleeve rod 14 is screwed on the adjusting seat 6, and a ring groove for conveniently hanging the spring is arranged on the circumferential side of the other end. The two ends of the return spring are provided with circular hanging rings, which are respectively sleeved on the spring hanging rod 13 and the spring sleeve rod 14.

[0064] Embodiment 3:

[0065] This embodiment provides an adjustable thermal magnetic trip structure, which, in addition to including the technical solutions of the above embodiments, further has the following technical features.

[0066] It further includes:

[0067] A time-delay mechanism, and the time-delay mechanism includes:

[0068] A time-delay contact rod 16, which is slidably arranged on the traction rod 2 and is provided with an inclined surface 18. The end of the bimetallic strip 5 can be in contact and cooperate with the inclined surface 18 of the time-delay contact rod 16;

[0069] A moving rod 17, one end of the moving rod 17 is fixedly connected to the time-delay contact rod 16, and the other end is provided with a moving groove 19;

[0070] A time-delay adjusting knob 28, which is rotatably connected to the adjusting seat 6, and an eccentric rod 26 is arranged at the end, and the eccentric rod 26 is inserted into the moving groove 19.

[0071] The time-delay contact rod 16 is arranged between the bimetallic strip 5 and the traction rod 2. An inclined surface 18 corresponding to the end of the bimetallic strip 5 is arranged on the side of the time-delay contact rod 16 facing the bimetallic strip 5. One end of the moving rod 17 is fixedly connected to the time-delay contact rod 16, and a moving groove 19 is formed at the other end. The time-delay adjusting knob 28 is rotatably connected to the adjusting seat 6, and an eccentrically arranged eccentric rod 26 is arranged at the end. The eccentric rod 26 is inserted into the moving groove 19. When the time-delay adjusting knob 28 is rotated, the eccentric rod 26 rotates. The cooperation between the eccentric rod 26 and the moving groove 19 can make the time-delay contact rod 16 slide, so that different positions of the inclined surface 18 correspond to the end of the bimetallic strip 5, thereby changing the distance between the bimetallic strip 5 and the inclined surface 18, and thus changing the time delay or the magnitude of the overload current.

[0072] Embodiment 4:

[0073] This embodiment provides an adjustable thermal magnetic trip structure, which, in addition to including the technical solutions of the above embodiments, further has the following technical features.

[0074] The drawbar 2 is provided with a sliding groove 20, and an installation groove 21 with a width greater than that of the sliding groove 20 is arranged at one end of the sliding groove 20. A sliding rod 27 is provided on the delay contact rod 16, and a first limiting portion 22 is arranged at the end of the sliding rod 27. The width of the limiting portion is less than that of the installation groove 21 and greater than that of the sliding groove 20.

[0075] The drawbar 2 is provided with a through sliding groove 20, and there are two sliding grooves 20. When installing the sliding rod 27, pass the first limiting portion 22 through the installation groove 21, and then slide the interactive rod in the sliding groove 20 so that the first limiting portion 22 is clamped on the sliding groove 20 to achieve the installation.

[0076] A second limiting portion 23 is arranged on the circumferential side of the delay adjusting knob 28, and a third limiting portion 24 which is in limiting cooperation with the second limiting portion 23 is arranged on the adjusting seat 6.

[0077] Through the cooperation of the second limiting portion 23 and the third limiting portion 24, the delay adjusting knob 28 can only rotate within a certain range, so that the pointing position of the pointer will not change.

[0078] It also includes:

[0079] A delay screw 25, the delay screw 25 is threadedly connected to one end of the bimetal 5, and has a slotted head at one end and abuts against the inclined surface 18 at the other end.

[0080] The distance between the delay screw 25 and the inclined surface 18 can also be adjusted by adjusting the relative position between the delay screw 25 and the bimetal 5.

[0081] The embodiments of the present application have been described above with reference to the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. An adjustable thermal magnetic tripping structure, characterized in that: include: A base (1), wherein a moving contact mechanism is installed in the base (1), and the moving contact mechanism comprises a traction rod (2); A magnet mounting seat (3), the magnet mounting seat (3) being mounted inside the base (1) and having an electromagnet disposed therein; An armature (4), the armature (4) is hinged on the magnet mounting seat (3), and one end of the armature (4) can be in contact with the traction rod (2); A bimetallic strip (5), the bimetallic strip (5) being arranged on the magnet mounting seat (3), one end of which can be in contact with the traction rod (2); An adjustment seat (6), the adjustment seat (6) being fixedly arranged on the base (1); An instantaneous adjustment rod (7) is rotatably connected to the adjustment seat (6), comprising a rod body (8), a resistance portion (9) and an adjustment portion (10), wherein the rod body (8) is provided with a resistance portion (9) that is in resistance with the armature (4); A reset mechanism, the reset mechanism is used to reset the instantaneous adjustment rod (7); The instantaneous adjustment button (11) is rotatably connected to the adjustment seat (6), and one end of the instantaneous adjustment button (11) is provided with a plurality of continuous stepped adjustment planes (12), the adjustment portion (10) is in contact with the adjustment plane (12), and an inclined plane is provided between adjacent adjustment planes (12).

2. The adjustable thermal magnetic tripping structure according to claim 1, characterized in that: The reset mechanism includes: A spring hanging rod (13), the spring hanging rod (13) being fixedly arranged on the rod body (8); A spring sleeve rod (14), the spring sleeve rod (14) is fixedly connected to the adjustment seat (6); A return spring, one end of which is hung on a spring hanging rod (13) and the other end of which is sleeved on a spring sleeve rod (14).

3. The adjustable thermal magnetic tripping structure according to claim 1, characterized in that: Also includes: Delay mechanism, the delay mechanism includes: A time-delay touch rod (16), the time-delay touch rod (16) is slidably disposed on the traction rod (2) and is provided with an inclined surface (18), and the end of the bimetallic strip (5) can be in contact with the inclined surface (18) of the time-delay touch rod (16); A moving rod (17), one end of the moving rod (17) is fixedly connected to the delay contact rod (16), and the other end is provided with a moving groove (19); A time delay adjustment button (28) is rotatably connected to the adjustment seat (6), and an eccentric rod (26) is provided on the end thereof, and the eccentric rod (26) is inserted into the movable groove (19).

4. The adjustable thermal magnetic tripping structure according to claim 1, characterized in that: A slide groove (20) is provided on the traction rod (2), and a mounting groove (21) having a width greater than that of the slide groove (20) is provided at one end of the slide groove (20); a sliding rod (27) is provided on the delay contact rod (16), and a first limiting portion (22) is provided at the end of the sliding rod (27); the width of the limiting portion is less than that of the mounting groove (21) and greater than that of the slide groove (20).

5. The adjustable thermal magnetic tripping structure according to claim 3, characterized in that: A second limiting portion (23) is provided on the periphery of the delay adjustment button (28), and a third limiting portion (24) that cooperates with the second limiting portion (23) is provided on the adjustment seat (6).

6. The adjustable thermal magnetic tripping structure according to claim 3, characterized in that: Also includes: The time-delay screw (25) is threadedly connected to one end of the bimetallic strip (5), and one end is provided with a slot, and the other end abuts against the inclined surface (18).

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