Small leakage protector
By optimizing the structural design of the leakage current protector and adopting simple and reasonable components and a snap-fit magnetic mechanism, the problems of complex tripping mechanisms and inaccurate positioning of moving contacts in existing technologies have been solved, achieving improvements in miniaturization, safety, and cost-effectiveness.
Patent Information
- Application Number
- CN202520518688.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-24
AI Technical Summary
Existing residual current devices (RCDs) have complex tripping mechanisms, large size, inaccurate positioning of moving contacts, and are difficult to assemble, which can easily lead to poor contact and pose safety hazards.
A small residual current device (RCD) was designed with a simple and reasonable structure, including a front shell, a bottom shell, a reset button, a reset spring, a circuit board, a trip coil, a current transformer, a pressure arm, a trip frame, and two moving contacts. The moving contacts are accurately positioned and disassembled through snap-fit and magnetic force, which is convenient for automated production line operations.
It achieves miniaturization of the leakage current protection device, simplifies its structure, ensures accurate positioning of the moving contact, facilitates assembly, enhances safety performance, reduces costs, and makes it suitable for automated production lines.
Smart Images
Figure CN223956543U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a small -size leakage protector. BACKGROUND
[0002] The existing leakage protector has the problems of complex tripping mechanism, large size, unreasonable combination and positioning of the tripping device and the moving contact, difficult assembly and unstable positioning of the moving contact, easy deviation of the moving contact, inaccurate correspondence of the moving contact, poor contact during operation, product burning caused by heating, fire caused by serious product safety performance. SUMMARY
[0003] The utility model discloses a small -size leakage protector which has simple and reasonable structure, firm positioning of the moving contact, accurate correspondence of the moving contact and the static contact, easy disassembly and reassembly, high efficiency, low cost and better safety performance.
[0004] In order to achieve the above-mentioned purpose, the utility model discloses a small -size leakage protector, which is characterized by comprising a face shell, a bottom shell, a reset button, a reset spring, a circuit board, two moving contacts, a tripping coil, a mutual inductor, a pressure arm, a tripping frame and two pins.
[0005] The face shell covers the bottom shell to form an inner cavity, and the reset button, the reset spring, the circuit board, the tripping coil, the mutual inductor, the pressure arm, the tripping frame and the two moving contacts are located in the inner cavity. The two pins are respectively positioned on the tripping frame through the bottom shell and are respectively connected to the monitoring circuit on the circuit board through the nails, and the upper ends of the two pins are respectively provided with static contacts. The circuit board and the tripping frame are fixed to each other. The front part of the tripping frame is provided with a first mounting position, the middle part of the tripping frame is provided with a second mounting position, and the two side walls of the first mounting position of the tripping frame are respectively provided with longitudinal sliding grooves. The tripping coil is located in the second mounting position. The two moving contacts are respectively provided with dynamic contacts at the front ends, and the two dynamic contacts correspond to the two static contacts. The tail ends of the two moving contacts are welded on the circuit board through the center hole of the mutual inductor and are connected to the output power line.
[0006] The left and right sides of the pressing arm are respectively provided with limbs, the pressing arm is installed in the first mounting position and can rotate forward and backward, the rear part of the pressing arm is provided with a first longitudinal slot, the front part of the pressing arm is provided with a second longitudinal slot, the second longitudinal slot is provided with a buckle, the limbs on the left and right sides respectively extend out of the buckle frame and can move up and down and rotate forward and backward in the corresponding longitudinal sliding slot, and the two movable contact pieces are pressed on the corresponding limbs; the lower end of the operating rod of the reset button is provided with a first hook, the operating rod of the reset button passes through the circuit board and is located in the second longitudinal slot and can move up and down, the reset spring is sleeved on the operating rod of the reset button and is located between the reset button and the circuit board, and under the elastic force of the reset spring, the reset button and the limbs on the two sides of the pressing arm can be driven to move upward at the same time, so that the two movable contacts on the two movable contact pieces are pulled to touch and electrically connect with the corresponding two static contacts at the same time.
[0007] A movable iron core is arranged in the center hole of the tripping coil and can move forward and backward, a small spring is arranged between the iron core and the tripping coil, the spherical head of the iron core is located in the first longitudinal slot, the small spring can rebound and push the iron core to move forward to make the buckle and the hook lock into one body, the iron core can also pull the pressing arm to turn backward under the magnetic force of the tripping coil to make the hook and the buckle separate, and the pressing arm can move downward under the rebounding force of the two movable contact pieces, so that the two movable contacts and the two static contacts are separated and disconnected at the same time.
[0008] In the technical scheme, the tail part of the tripping frame is provided with a third mounting position, the mutual inductor is installed in the third mounting position, and two second hooks are arranged on the two sides of the third mounting position, the second hooks buckle the outer wall of the mutual inductor to position the mutual inductor.
[0009] In the technical scheme, the middle part of the two movable contact pieces is provided with a concave-shaped bending position, the two side walls of the concave-shaped bending position are both provided with downward inclined hooks, steps are arranged on the left and right inner walls of the fourth mounting position, and the hook stings are buckled on the corresponding steps to fix the movable contact pieces in position.
[0010] Compared with the prior art, the advantages of the utility model are that the leakage protector has small size, the tripping device has simple and reasonable structure, the movable contact pieces are accurately and firmly positioned, the leakage protector is easy to assemble and is convenient for automatic assembly line operation, the efficiency is higher, the cost is lower, and the safety performance is better. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is the schematic diagram of the utility model;
[0012] Figure 2 is the exploded view of the utility model;
[0013] Figure 3 is the schematic diagram of the utility model without the surface shell and the bottom shell;
[0014] Figure 4 isFigure 3 is a plan view of
[0015] Figure 5 is Figure 4 is an A-A sectional view of
[0016] Figure 6 is Figure 5 is an enlarged view of partial D;
[0017] Figure 7 is Figure 4 is a B-B sectional view of
[0018] Figure 8 is a C-C sectional view of Figure 4
[0019] Figure 9 is a side view of the utility model;
[0020] Figure 10 is Figure 9 is an E-E sectional view of DETAILED DESCRIPTION
[0021] The specific embodiments of the utility model will be further described below with reference to the drawings. It needs to be explained here that the description of these embodiments is used to help understanding the utility model, but does not constitute the limitation to the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined mutually as long as they do not conflict with each other.
[0022] As Figure 1 and Figure 10 shown it is a kind of small leakage protector, including: face shell, bottom shell, reset button 2, reset spring 3, circuit board 4, two movable contact 5, trip coil 7, mutual inductor 8, pressure arm 9, trip frame 10 and two plug 11;
[0023] The face shell cover forms an inner cavity on the bottom shell, and the reset button 2, the reset spring 3, the circuit board 4, the trip coil 7, the transformer 8, the pressure arm 9, the trip frame 10, and the two movable contact pieces 5 are all located in the inner cavity; the two pins 11 are respectively positioned on the trip frame 10 through the bottom shell and are electrically connected to the monitoring circuit on the circuit board 4 through the nail feet 112 thereof, and the upper ends of the two pins 11 are respectively provided with stationary contact points 111; the circuit board 4 and the trip frame 10 are fixed to each other; the front part of the trip frame 10 is provided with a first mounting position 101, the middle part of the trip frame 10 is provided with a second mounting position 102, the two side walls of the first mounting position 101 of the trip frame 10 are respectively provided with longitudinal sliding grooves, and the trip coil 7 is arranged in the second mounting position 102 and is positioned; the two outer sides of the second mounting position 102 of the trip frame 10 are provided with fourth mounting positions 104, the middle part of the two movable contact pieces 5 is provided with a reverse concave bending position 52, the reverse concave bending position 52 is mounted on the fourth mounting position 104 and can be detached, the front end of the two movable contact pieces 5 is provided with movable contact points 51, the two movable contact points 51 correspond to the two stationary contact points 111, and the tail ends of the two movable contact pieces 5 are welded on the circuit board 4 through the center hole of the transformer 8 and are electrically connected to the output power line.
[0024] The left and right sides of the pressure arm 9 are respectively provided with limb arms 92, the pressure arm 9 is mounted in the first mounting position 101 and can rotate forward and backward, the rear part of the pressure arm 9 is provided with a first longitudinal slot 91, the front part of the pressure arm 9 is provided with a second longitudinal slot 93, the second longitudinal slot 93 is provided with a buckle 94, the left and right limb arms 92 respectively extend out of the trip frame 10 and can move up and down and rotate forward and backward in the corresponding longitudinal sliding grooves, and the two movable contact pieces 5 are pressed on the corresponding limb arms 92; the lower end of the operating rod of the reset button 2 is provided with a first hook 21, the operating rod of the reset button 2 passes through the circuit board 4 and is located in the second longitudinal slot 93 and can move up and down, the reset spring 3 is sleeved on the operating rod of the reset button 2 and is located between the reset button 2 and the circuit board 4, and under the elastic force of the reset spring 3, the reset button 2 and the two limb arms 92 on the left and right sides of the pressure arm 9 can be simultaneously moved upward, so as to pull the two movable contact points 51 on the two movable contact pieces 5 to simultaneously touch and electrically connect the corresponding two stationary contact points 111.
[0025] The center hole of the trip coil 7 is provided with an iron core 6 which can move forward and backward, a small spring 12 is arranged between the iron core 6 and the trip coil 7, the spherical head of the iron core 6 is located in the first longitudinal slot 91, the small spring 12 can rebound and push the iron core 6 to move forward to make the buckle 94 and the hook 21 locked into one body, the iron core 6 can also pull the pressure arm 9 to turn backward under the magnetic force of the trip coil 7 to make the hook 21 and the buckle 94 separated, and the pressure arm 9 can move downward under the rebounding force of the two movable contact pieces 5, and the two movable contact points 51 and the two stationary contact points 111 are simultaneously separated and disconnected.
[0026] In assembly, the middle inverted concave bending position of the movable contact 5 is installed on the fourth installation position 104, which is accurate, firm and easy to disassemble.
[0027] In operation, when the reset button 2 is pressed, the small spring 12 in the center hole of the tripping coil 7 rebounds to push the iron core 6 to move forward, forcing the pressure arm 9 to turn to the reset button 2 side and close, until the hook 21 of the reset button 2 and the buckle 94 of the pressure arm 9 are locked together, under the elastic force of the reset spring 3, the reset button 2 and the pressure arm 9 move upward together, until the movable contact 5 and the static contact 11 touch at the same time, and normal power supply is started; once a leakage fault occurs, the monitoring circuit immediately outputs a large current to the tripping coil 7 to generate a strong magnetic field, the spherical head of the iron core 6 inductively pulls the pressure arm 9 to turn backward, causing the hook 21 of the reset button 2 and the buckle 94 of the pressure arm 9 to be unlocked, under the elastic force of the reset spring 3, the reset button 2 and the control lever move upward, and the pressure arm 9 moves downward under the rebounding action of the two movable contacts 5, the two movable contacts 51 and the two static contacts 111 are separated at the same time to cut off the power supply of the load, achieving the purpose of leakage protection.
[0028] In the embodiment, the tail of the tripping frame 10 is provided with a third installation position 103, the mutual inductor 8 is installed in the third installation position 103, and two second hooks 105 are arranged on both sides of the third installation position 103, the second hooks 105 buckle the outer wall of the mutual inductor 8 to position the mutual inductor 8. In use, the hooks 105 buckle the outer wall of the mutual inductor 8, and the tail end of the movable contact 5 passes through the center hole of the mutual inductor 8 to fix the mutual inductor 8 in position.
[0029] In the embodiment, the middle part of the two movable contacts 5 is provided with an inverted concave bending position 52, the two side walls of the inverted concave bending position 52 are both provided with downward inclined barbs 521, and steps 106 are arranged on the left and right inner walls of the fourth installation position 104, the barbs 521 are buckled on the corresponding steps 106 to fix the movable contact 5 in position.
[0030] The embodiments of the utility model are described in detail in combination with the drawings, but the utility model is not limited to the described embodiments. For ordinary skilled persons in the art, various changes, modifications, replacements and deformations of the embodiments without departing from the principles and purposes of the utility model still fall within the protection scope of the utility model.
Claims
1. A small-sized leakage protector, characterized by The utility model relates to a kind of microcomputer overload release, including: Face shell, bottom shell, reset button (2), reset spring (3), circuit board (4), two movable contact (5), trip coil (7), mutual inductor (8), pressure arm (9), tripping frame (10) and two pins (11); The face shell covers on the bottom shell form inner cavity, and reset button (2), reset spring (3), circuit board (4), trip coil (7), mutual inductor (8), pressure arm (9), tripping frame (10), two movable contact (5) are all located in the inner cavity;Two pins (11) are respectively positioned on tripping frame (10) by passing through bottom shell and are electrically connected with monitoring circuit on circuit board (4) by its nail foot (112) respectively, the upper end of two pins (11) is respectively provided with static contact (111), and circuit board (4) and tripping frame (10) are mutually fixed, the front of tripping frame (10) is provided with first mounting position (101), and second mounting position (102) is provided in the middle of tripping frame (10), and the two side walls of the first mounting position (101) of tripping frame (10) are respectively provided with longitudinal sliding groove, and trip coil (7) is positioned in second mounting position (102);Fourth mounting position (104) is provided outside second mounting position (102) of tripping frame (10), and the middle inverted concave bending position (52) of two movable contact (5) is mounted on fourth mounting position (104) and can be detached, and movable contact (51) is provided at the front end of two movable contact (5), and two movable contact (51) correspond to two static contact (111), and the tail end of two movable contact (5) is welded on circuit board (4) by passing through the center hole of mutual inductor (8) and is electrically connected with output power line; The left and right sides of pressure arm (9) are respectively provided with limb (92), and pressure arm (9) is installed in first mounting position (101) and can rotate forward and backward, and the rear of pressure arm (9) is provided with first longitudinal slot (91), and the front of pressure arm (9) is provided with second longitudinal slot (93), and buckle (94) is arranged in second longitudinal slot (93), and the left and right limb (92) respectively extends tripping frame (10) and can move up and down and rotate forward and backward in corresponding longitudinal sliding groove, and two movable contact (5) is pressed on corresponding limb (92);The lower end of the operating lever of reset button (2) is provided with first hook (21), and the operating lever of reset button (2) passes through circuit board (4) and is located in second longitudinal slot (93) and can move up and down, and reset spring (3) is sleeved on the operating lever of reset button (2) and is located between reset button (2) and circuit board (4), and under the action of the elastic force of reset spring (3), reset button (2) and the two side limbs (92) of pressure arm (9) can be driven to move up simultaneously, so as to pull two movable contact (51) on two movable contact (5) and corresponding two static contact (111) to touch and connect electrically simultaneously. The iron core (6) is arranged in the center hole of the trip coil (7) and can move forward and backward. A small spring (12) is arranged between the iron core (6) and the trip coil (7). The spherical head of the iron core (6) is arranged in the first longitudinal slot (91). The small spring (12) can push the iron core (6) to move forward to make the buckle (94) and the hook (21) be locked as a whole. The iron core (6) can also pull the pressure arm (9) to turn backward under the magnetic force of the trip coil (7) to make the hook (21) and the buckle (94) be unlocked and separated. The pressure arm (9) can move downward under the rebound force of the two moving contact pieces (5) to make the two moving contact points (51) and the two static contact points (111) be separated and disconnected at the same time.
2. The miniature leakage protector according to claim 1, wherein The tail of the trip frame (10) is provided with a third mounting position (103). The mutual inductor (8) is arranged in the third mounting position (103). Two second hooks (105) are arranged on the two sides of the third mounting position (103). The second hooks (105) buckle the outer wall of the mutual inductor (8) to position the mutual inductor (8).
3. The miniature leakage protector of claim 1, wherein The middle part of the two moving contact pieces (5) is provided with a concave bending position (52). The two side walls of the concave bending position (52) are provided with downward inclined hooks (521). The left and right inner walls of the fourth mounting position (104) are provided with steps (106). The hooks (521) are arranged on the corresponding steps (106) to fix the moving contact pieces (5) in position.