Resettable overvoltage and undervoltage protector

Abstract

According to the technical scheme, the self-recovery overvoltage and undervoltage protector is characterized in that the self-recovery overvoltage and undervoltage protector comprises a machine shell, a circuit unit, a control unit, a static contact and a moving contact, the circuit unit is connected with the control unit, the control unit comprises a shell, an electromagnet, a rotating part and a limiting part, and the shell is detachably installed on the circuit unit; the rotating part comprises a rotating center, a first arm, a second arm and a third arm, the first arm, the second arm and the third arm are arranged in the circumferential direction of the rotating center, and the rotating center is rotationally connected into the shell through a torsional spring; the first arm is made of a magnetic material; the moving contact is arranged at one end of the second arm; the limiting part comprises a limiting seat, a linkage plate, a first limiting block and a second limiting block, the linkage plate is provided with a first limiting hole, a second limiting hole and a linkage groove, and one end of the third arm is located in the linkage groove. And the two contacts are stably attached in the electrifying process.

Description

Technical Field

[0001] The invention relates to the field of low-voltage distributors, and more specifically, to a self-resetting over- and under-voltage protector. Background Art

[0002] The self-resetting over- and under-voltage protector is a circuit safety protection device that is driven by a circuit board and uses a traditional mechanical switch to connect and disconnect the circuit. When the power supply line is over-voltage or under-voltage, the protector can quickly and safely cut off the circuit under abnormal voltage to prevent the abnormal voltage from being sent to the terminal electrical appliances and causing accidents. When the voltage returns to normal, the protector will automatically connect the circuit within the specified time to ensure that the terminal electrical appliances operate normally without supervision. The over- and under-voltage protector is suitable for users or loads with single-phase 230V or three-phase 400V AC voltage, frequency 50Hz, and rated working current of 100A and below. It is used as a protection for single-phase or three-phase line over- and under-voltage caused by neutral line faults on single-phase or three-phase electrical equipment. It is mainly used for the protection of residential distribution boxes or distribution lines that need to protect single-phase or three-phase electrical equipment.

[0003] The self-resetting over- and under-voltage protector includes a shell, a circuit part and a contact device. The contact device includes a contact part and a magnetic latching relay for controlling the contact part to be attracted or separated. The magnetic latching relay realizes circuit control by attracting or separating two contacts through a magnet. Due to the limited magnetic force of the magnet, the contact part is limited to a sufficiently large contact opening distance. If the opening distance of the relay is large, automatic resetting cannot be achieved. Therefore, when the main circuit is disconnected due to overvoltage, the two contacts are in a micro-break state. In the micro-break state, the distance between the two contacts is small. Therefore, in the overvoltage state, the open-circuit voltage between the two contacts will be relatively large, which will easily break through the air between the two contacts, thereby causing an arc, which may cause equipment damage.

[0004] Since only the magnetic force of permanent magnets is used to provide pressure, when the magnetic force is unstable, the contacts will shake violently, causing the circuit to be disconnected multiple times, and arcs will be generated, causing equipment damage and even fire in severe cases, making it impossible to meet the current high current carrying requirements. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a self-resetting over- and under-voltage protector, which can keep the two contacts at a normal distance during overvoltage and undervoltage processes and keep the two contacts stably fitted during power-on.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a self-resetting over-voltage and under-voltage protector, comprising a housing, a circuit unit, a control unit, a static contact and a moving contact, wherein the circuit unit is connected to the control unit and is used to control the opening and closing of the static contact and the moving contact through the control unit according to the voltage condition, wherein the control unit comprises a housing, an electromagnet, a rotating part and a limiting part, and the housing is detachably mounted on the circuit unit; The rotating part includes a rotating center, a first arm, a second arm and a third arm, wherein the first arm, the second arm and the third arm are arranged along the circumference of the rotating center, and the rotating center is rotatably connected to the housing through a torsion spring; The first arm is made of magnetic material and is linked with the electromagnet; The length of the second arm is greater than that of the first arm, and the moving contact is arranged at one end of the second arm; The limiting part includes a limiting seat, a linkage plate, a first limiting block and a second limiting block, the linkage plate is slidably connected to the limiting seat, the linkage plate is provided with a first limiting hole, a second limiting hole and a linkage groove, the first limiting block is slidably matched with the first limiting hole, the second limiting block is slidably matched with the second limiting hole, and one end of the third arm is located in the linkage groove; When the moving contact and the stationary contact are separated, the first limiting block is separated from the first limiting hole, and the second limiting block is limitedly engaged with the second limiting hole; When the electromagnet drives the rotating part to rotate, the third arm pulls the linkage plate to move through the linkage groove. At this time, the first limit block is limitedly engaged with the first limit hole, and the second limit block is separated from the second limit hole.

[0007] In summary, the present invention has the following beneficial effects: 1. By utilizing the over-voltage and under-voltage modules and the single-chip microcomputer module in the circuit unit, when the power supply line is over-voltage or under-voltage, the single-chip microcomputer module outputs an over-voltage or under-voltage pulse signal. At this time, the control unit can cut off the circuit to protect the safety of the equipment. When the voltage returns to normal, the control unit automatically connects the circuit within the specified time to ensure the normal operation of the terminal appliance in unattended conditions.

[0008] 2. The length of the second arm is greater than that of the first arm. Therefore, when the electromagnet drives the first arm to rotate clockwise along the rotation center, the moving stroke of the second arm will be greater than that of the first arm. Similarly, during the opening process, a larger gap can be formed between the moving contact and the static contact, thereby avoiding arcing under overvoltage conditions.

[0009] 3. When the moving contact and the static contact are in closed contact, the first limit block and the first limit hole are engaged to provide an engaging force F1, and the electromagnet provides a suction force F2. At this time, only the torsion spring provides a separation force F3. At this time, F1+F2>F3>F1 is satisfied. When an undervoltage state occurs, F2 will fluctuate. However, due to the existence of the engaging force F1, the shaking of the moving contact can be avoided to ensure the safety of the equipment.

[0010] When the moving contact and the static contact switch from the closed state to the open state, the suction force F2 disappears, and the linkage plate moves to the left under the action of F3. At this time, the first limit block and the second limit hole can be gradually separated, and the second limit block is gradually inserted into the second limit hole. The second limit block can provide a lateral thrust F4. In this state, F3+F4>F1 can be satisfied, ensuring the stability of the movement of the linkage plate.

[0011] 4. A current sampling circuit (existing circuit) is provided in the circuit unit, through which the leakage current signal is continuously detected. If the leakage current signal is detected to be greater than the set value, a set of signals is immediately output to the control unit, and the main circuit is cut off through the magnetic latching relay to achieve the purpose of protecting the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural diagram of a self-resetting over- and under-voltage protector; Figure 2 It is a three-dimensional structural schematic diagram of the circuit unit and the control unit; Figure 3 It is a schematic diagram of the three-dimensional structure of the first embodiment of the control unit; Figure 4 It is a schematic diagram of the three-dimensional structure of the second embodiment of the control unit; Figure 5 It is a three-dimensional structural schematic diagram of the adjusting member and the limiting member; Figure 6 It is a schematic diagram of the separation structure of the limiting member; Figure 7 It is a schematic diagram of the structure inside the regulating part; Figure 8 It is a schematic diagram of the structure inside the limiter.

[0013] Figure numerals: 1, upper housing; 11, lower housing; 12, connecting structure; 13, adjusting member; 14, air seat; 15, moving plate; 16, vent hole; 17, air guide rod; 171, first end; 172, second end; 173, third end; 2, circuit unit; 21, circuit board; 22, first clamping block; 23, second clamping block; 3, control unit; 31, housing; 311, connecting hole; 32, electromagnet; 33, rotating part; 331, rotating center; 332, first arm; 333, second arm; 334, third arm; 34, limiting part; 341, limiting seat; 342, linkage plate; 3421, first limiting hole; 3422, second limiting hole; 3423, linkage groove; 343, first limiting block; 344, second limiting block; 35, driving spring; 36, ejector pin; 37, return spring; 38, first mounting seat; 381, matching slope; 39, second mounting seat; 391, linkage slope; 4, static contact; 5, moving contact; 6, limiting member; 61, limiting frame; 62, moving block; 63, limiting spring; 64, first air duct; 65, second air duct; 7, linkage structure; 71, linkage rod; 8, adjustment mechanism; 81, driving rack; 82, driving gear. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Reference Figures 1 to 8 As shown, in order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-resetting over-voltage and under-voltage protector, comprising a housing, a circuit unit 2, a control unit 3, a static contact 4 and a moving contact 5, wherein the circuit unit 2 is connected to the control unit 3 and is used to control the opening and closing of the static contact 4 and the moving contact 5 through the control unit 3 according to the voltage condition, wherein the control unit 3 comprises a housing 31, an electromagnet 32 ​​(magnetic latching relay), a rotating part 33 and a limiting part 34, and the housing 31 is detachably mounted on the circuit unit 2; The rotating part 33 includes a rotating center 331, a first arm 332, a second arm 333 and a third arm 334. The first arm 332, the second arm 333 and the third arm 334 are arranged along the circumference of the rotating center 331. The rotating center 331 is rotatably connected to the housing 31 through a torsion spring. The first arm 332 is made of magnetic material and is arranged in linkage with the electromagnet 32; The length of the second arm 333 is greater than that of the first arm 332 , and the moving contact 5 is disposed at one end of the second arm 333 ; The limiting portion 34 includes a limiting seat 341, a linkage plate 342, a first limiting block 343 and a second limiting block 344. The linkage plate 342 is slidably connected to the limiting seat 341. The linkage plate 342 is provided with a first limiting hole 3421, a second limiting hole 3422 and a linkage groove 3423. The first limiting block 343 is slidably matched with the first limiting hole 3421, the second limiting block 344 is slidably matched with the second limiting hole 3422, and one end of the third arm 334 is located in the linkage groove 3423. When the moving contact 5 and the stationary contact 4 are separated, the first limiting block 343 is separated from the first limiting hole 3421, and the second limiting block 344 is limitedly engaged with the second limiting hole 3422; When the electromagnet 32 ​​drives the rotating part 33 to rotate, the third arm 334 pulls the linkage plate 342 to move through the linkage slot 3423 . At this time, the first limit block 343 is engaged with the first limit hole 3421 , and the second limit block 344 is separated from the second limit hole 3422 .

[0016] The design of the present invention has the following advantages: 1. By utilizing the over-voltage and under-voltage modules and the single-chip microcomputer module in the circuit unit 2, when the power supply line is over-voltage or under-voltage, the single-chip microcomputer module outputs an over-voltage or under-voltage pulse signal. At this time, the control unit 3 can cut off the circuit to protect the safety of the equipment. When the voltage returns to normal, the control unit 3 automatically connects the circuit within the specified time to ensure the normal operation of the terminal appliance in an unattended state.

[0017] like Figure 3 As shown, 2. The length of the second arm 333 is greater than that of the first arm 332. Therefore, when the electromagnet 32 ​​drives the first arm 332 to rotate clockwise along the rotation center 331, the moving stroke of the second arm 333 will be greater than the moving stroke of the first arm 332. Similarly, during the opening process, a larger gap can be formed between the moving contact 5 and the static contact 4, thereby avoiding arcing under overvoltage conditions.

[0018] like Figure 8 As shown, 3. When the moving contact 5 and the static contact 4 are in a closed contact state, the first limit block 343 and the first limit hole 3421 are engaged to provide an engaging force F1, and the electromagnet 32 ​​provides a suction force F2. At this time, only the torsion spring provides a separation force F3. At this time, F1+F2>F3>F1 is satisfied. When an undervoltage state occurs, F2 will fluctuate. However, due to the existence of the engaging force F1, the moving contact 5 can be prevented from shaking, thereby ensuring the safety of the equipment.

[0019] When the moving contact 5 and the stationary contact 4 switch from the closed state to the open state, the suction force F2 disappears, and the linkage plate 342 moves to the left under the action of F3 (as shown in FIG. Figure 3 and Figure 4As shown, the width of the linkage groove is relatively small. During the clockwise rotation of the third arm, the right wall of the third arm abuts against the groove wall of the linkage groove, thereby pushing it to move to the right. During the counterclockwise rotation of the third arm, the left wall of the third arm abuts against the groove wall of the linkage groove, thereby pushing it to move to the left). At this time, the first limit block 343 and the second limit hole 3422 can be gradually separated, and the second limit block 344 is gradually inserted into the second limit hole 3422. The second limit block 344 can provide a lateral thrust F4. In this state, F3+F4>F1 can be satisfied, thereby ensuring the stability of the movement of the linkage plate 342.

[0020] And when the opening is completed, the second limiting block is locked with the second limiting hole to provide a stable holding force.

[0021] The first limit block 343 and the second limit block 344 each include a mounting seat, a driving spring 35 and an ejector pin 36. A sliding groove is provided in the limit seat 341, and the mounting seat is slidably connected in the sliding groove. A return spring 37 is provided between the mounting seat and the limit seat 341. The driving spring 35 and the ejector pin 36 are both arranged in the mounting seat, and the driving spring 35 is used to drive the ejector pin 36 to move toward the linkage plate 342; The circuit unit 2 includes a circuit board 21 , on which two groups of card blocks are arranged, and on the housing 31 , two groups of card slots are arranged. When the two card blocks are respectively inserted into the two card slots, the two card blocks respectively push the two mounting seats to move.

[0022] The card blocks are respectively the first card block 22 and the second card block 23, and the mounting seats are respectively the first mounting seat 38 and the second mounting seat 39. The end of the first card block 22 and the bottom of the first mounting seat 38 are both provided with a matching inclined surface 381. When the first card block 22 is inserted into the card slot, the first card block 22 pushes the first mounting seat 38 to move toward the direction close to the linkage plate 342. The end of the second clamping block 23 and the middle of the second mounting seat 39 are both provided with linkage inclined surfaces 391 . When the second clamping block 23 is inserted into the clamping slot, the second clamping block 23 pushes the second mounting seat 39 to move away from the linkage plate 342 .

[0023] like Figure 8 and Figure 2 As shown, a snap-fit ​​structure is provided inside the casing, and the housing 31 is snapped onto the circuit board 21 through a snap slot (and the terminals of the circuit board 21 are connected to the terminals of the control unit 3), and then assembled into the snap-fit ​​structure to ensure the stability of the connection.

[0024] When the first block 22 and the second block 23 are not inserted into the slot, the first limit block 343 does not contact the linkage plate 342, and the drive spring 35 in the first limit block 343 is in an extended state instead of being compressed, thereby ensuring the performance of the spring. And the second limit block 344 is inserted into the second limit hole 3422, and the moving contact 5 and the static contact 4 cannot be closed at this time, ensuring the safety of the equipment. Figure 8 As shown, the depth of the second limiting hole 3422 is greater than that of the first limiting hole 3421, and the ejector pin 36 includes not only an arc at the upper end, but also a square at the lower end. When the square area of ​​the ejector pin 36 abuts against the inner wall of the second limiting hole 3422, the linkage plate 342 cannot be pulled at this time.

[0025] When the first card block 22 and the second card block 23 are both inserted into the card slot, the first mounting seat 38 is pushed upward by the cooperation of the matching inclined surface 381, and the second mounting seat 39 is pushed downward by the cooperation of the linkage inclined surface 391. Figure 2 As shown, the matching inclined surface 381 and the linkage inclined surface 391 on the same side have different inclined surface directions.

[0026] Furthermore, the slope directions of the two matching slopes are different, and the slope directions of the two linked slopes are different.

[0027] And during the movement of the linkage plate 342, the lower wall of the linkage plate 342 will push the ejector pin 36 to move. When the ejector pin 36 moves downward, it will compress the driving spring 35. When the ejector pin 36 moves to the position of the limiting hole, it moves upward under the action of the driving spring 35 to form a locking limit.

[0028] The housing includes an upper housing 1 and a lower housing 11, and both ends of the upper housing 1 and the lower housing 11 are provided with interconnecting connection structures 12; Figure 1 As shown, the connection structure 12 is a bolt connection on both sides.

[0029] An adjusting member 13 is disposed at the upper end of the upper housing 1 , a communicating hole 311 is opened at the upper end of the shell 31 , and the lower end of the adjusting member 13 passes through the communicating hole 311 and is inserted into the shell 31 .

[0030] The above is Example 1, and the following is Example 2 based on Example 1.

[0031] The housing 31 is slidably connected with a limit member 6, which is located between the moving contact 5 and the stationary contact 4. When the moving contact 5 approaches the stationary contact 4, the moving contact 5 can push the limit member 6 to move horizontally. The upper end of the limiting member 6 and the lower end of the adjusting member 13 are provided with a linkage structure 7 which is linked to each other.

[0032] The limiting member 6 includes a limiting frame 61, a moving block 62 and a limiting spring 63. The limiting frame 61 is fixedly installed in the housing 31. A sliding cavity is provided in the limiting frame 61. The moving block 62 is slidably connected in the sliding cavity. The limiting spring 63 is provided between the moving block 62 and the inner wall of the limiting frame 61. A connecting groove is formed at the upper end of the limiting frame 61 . The linkage structure 7 includes a connecting rod 71 disposed at the upper end of the moving block 62 . The upper end of the connecting rod 71 extends out of the connecting groove and is connected to the adjusting member 13 .

[0033] The adjusting member 13 includes an air seat 14, a movable plate 15 (such as Figure 7 As shown, a spring is arranged between the movable plate 15 and the inside of the air seat 14. When the movable plate 15 moves to the left, the spring will be compressed. When the movable plate 15 is not subjected to force, it will be reset under the action of the spring), a vent hole 16 and an air guide rod 17. The movable plate 15 is slidably connected in the air seat 14, and one end of the air guide rod 17 is connected to the air seat 14 through the vent hole 16; The air seat is located on the left side of the movable plate and is provided with an air hole connected to the outside, which can maintain the stability of the air pressure on the left side, avoid excessive pressure causing additional thrust, and make the internal force easier to calculate.

[0034] An air inlet passage is provided on the limiting frame 61, and the other end of the air guide rod 17 is connected to the air inlet passage; The linkage rod 71 is slidably connected to the lower end of the air seat 14 , and the moving plate 15 is connected to the external linkage rod 71 through a connecting rope. When the linkage rod 71 moves, it can drive the moving plate 15 to move.

[0035] like Figure 4 , Figure 5 , Figure 6 as well as Figure 7 As shown, when the second arm 333 rotates upward, it can push the moving block 62 to move outward (into the sliding cavity). At this time, the moving block 62 compresses the limit spring 63 and drives the linkage rod 71 to move. When the linkage rod 71 moves to the right, the moving plate 15 is pulled to the left (the vent hole 16 is provided on the right side of the moving plate 15) by the connecting rope, so that the chamber on the right side of the moving plate 15 in the air seat 14 becomes larger, so that the gas near the static contact 4 is absorbed through the vent hole 16 and the gas guide rod 17, and the air concentration inside is reduced, thereby reducing the probability of arc generation; When the second arm 333 is reset, the moving block 62 moves to the left under the action of the limit spring 63. At this time, the linkage rod 71 moves to the left, and the moving plate 15 moves to the right under the action of the spring, thereby discharging the gas originally in the right chamber through the vent 16 and the air duct toward the static contact 4, thereby playing an arc blowing role and ensuring the safety of the opening switch.

[0036] like Figure 7 and Figure 5 As shown, in order to ensure the stability of the movement of the moving plate 15 and the linkage rod 71, guide rods are provided at the lower end and inside of the air seat 14.

[0037] Furthermore, during the opening process, due to the release of the torsion spring, there is a force peak. When the torsion spring is in the peak state, F3 must be much greater than F1. At this time, a gap will appear between the moving contact 5 and the static contact 4. At this time, the moving block 62 will be inserted into the gap under the push of the limit spring 63. Figure 5 As shown, the end face of the moving block 62 is an inclined surface, so it can continuously provide the plug-in force F5. When the force F4 does not appear, it can achieve the situation of F3+F5>F1, providing a guarantee for the opening of the switch.

[0038] The limiting frame 61 is provided with a first air duct 64 and a second air duct 65. The limiting frame 61 is provided with a first air outlet and a second air outlet on the side facing the moving contact 5. The first air outlet is communicated with the first air duct 64, and the second air outlet is communicated with the second air duct 65. The air guide rod 17 is connected to the first air guide passage 64 or the second air guide passage 65 , and an adjusting mechanism 8 for adjusting the position of the air guide rod 17 is arranged in the limiting frame 61 .

[0039] The adjusting mechanism 8 includes a driving rack 81 and a driving gear 82. The driving gear 82 is rotatably installed in the limiting frame 61. The driving rack 81 is installed on the moving block 62. The moving block 62 can drive the driving gear 82 to rotate 15° to 30° during the movement. An air guide groove for the movement of the air guide rod 17 is provided on the limiting frame 61. The entrances of the first air guide channel 64 and the second air guide channel 65 are respectively located on both sides of the air guide groove, which not only plays a limiting role, but also facilitates the alignment of the air guide rod 17 with the entrance. The driving gear 82 is arranged in linkage with the air guide rod 17.

[0040] The air guide rod 17 includes a first end 171, a second end 172 and a third end 173, and the first end 171 is connected to the air seat 14; The second end 172 is mounted on the driving gear 82 in linkage; The limiting frame 61 is provided with a moving groove, the entrance of the first air inlet passage 64 and the entrance of the second air inlet passage 65 are respectively located at two ends of the moving groove, and the third end 173 is slidably connected in the moving groove; During the opening process, the gas in the gas seat 14 is blown from the first end 171 to the third end 173 .

[0041] The design of this structure is that during the opening process, the moving block 62 moves outward (left), and at this time the driving rack 81 on the moving block 62 drives the driving gear 82 to rotate counterclockwise, so that the gas guide rod 17 rotates with the second end 172 as the fulcrum, and rotates from the first air inlet channel 64 to the second air inlet channel 65, realizing the change of gas direction.

[0042] like Figure 5 As shown, the first air outlet and the second air outlet are at different height positions. Furthermore, the first air outlet of the first air duct 64 has a smaller inclination angle, which is suitable for the position when the static contact 4 and the moving contact 5 are just separated, and can blow the arc in this area. The second air outlet of the second air duct has a larger inclination angle, and can blow air diagonally downward, thereby making the arc blowing process more targeted and ensuring the stability of the arc blowing process.

[0043] The air bleed channel can be provided with two or more groups, and the specific design structure is as follows: Figure 5 and Figure 6 As shown, when there are two groups of air bleed channels, the driving rack 81 is one group, so that when the moving block 62 moves from right to left, the driving rack 81 can drive the driving gear 82 to rotate once; Embodiment three, based on the extended embodiment of the above-mentioned embodiment two, when the driving rack 81 is two groups, and also includes a third air inlet channel, and is arranged at intervals, when the total moving stroke of the moving block 62 is S, and is divided into S1, S2, S3, S4, S5, S6 moving nodes, when in the S1 to S2 stage, the air guide rod 17 is connected to the first air inlet channel 64, in the S2 to S3 stage, the driving gear 82 and the first position rack are transmitted, so that the air guide rod 17 is rotated from the first air inlet channel 64 to the second air inlet channel 65, in the S3 to S4 stage, the air guide rod 17 is connected to the second air inlet channel 65, in the S4 to S5 stage, the driving gear 82 and the second position rack are transmitted, so that the air guide rod 17 is rotated from the second air inlet channel 65 to the third air inlet channel, and in the S5 to S6 stage, the air guide rod 17 is connected to the third air inlet channel.

[0044] In order to prevent the driving gear 82 from continuing to rotate under the action of inertia, so that the air guide rod and the corresponding air bleed channel are staggered, the lower end of the air guide rod 17 is slidably connected with an air guide head. When the air guide head moves to the position of the air bleed channel, the air guide head moves down and can be slightly engaged with the air bleed channel, which can ensure that the air guide rod and the air bleed channel are aligned, thereby ensuring the stability of ventilation. When the driving gear 82 is meshed with the driving rack 81 again, it can push the air guide head to move, thereby rotating the position of the air guide rod 17. A spring is arranged between the air guide head and the air guide rod 17, which can make the guide head move up and down.

[0045] Furthermore, the device also has a leakage protection function. A current sampling circuit (existing circuit) is provided in the circuit unit 2. The leakage current signal is continuously detected by the current sampling circuit. If the leakage current signal is detected to be greater than the set value, a set of signals is immediately output to the control unit 3, and the main circuit is cut off through the magnetic latching relay to achieve the purpose of protecting the safety of the device. Specifically, the leakage detection function in the prior art CN103311884B can be used.

[0046] Furthermore, the device has the basic structure of a self-resetting over-voltage and under-voltage protector, such as a power supply circuit, a microprocessor, a voltage detection circuit, a working status indicator light, and a control unit 3 (execution relay).

[0047] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A self-resetting over- and under-voltage protector, comprising a housing, a circuit unit (2), a control unit (3), a stationary contact (4) and a moving contact (5), wherein the circuit unit (2) is connected to the control unit (3) and is used to control the opening and closing of the stationary contact (4) and the moving contact (5) through the control unit (3) according to a voltage condition, wherein: The control unit (3) comprises a housing (31), an electromagnet (32), a rotating part (33) and a limiting part (34); the housing (31) is detachably mounted on the circuit unit (2); The rotating part (33) includes a rotating center (331), a first arm (332), a second arm (333) and a third arm (334), wherein the first arm (332), the second arm (333) and the third arm (334) are arranged along the circumference of the rotating center (331), and the rotating center (331) is rotatably connected to the housing (31) via a torsion spring; The first arm (332) is made of a magnetic material and is arranged in linkage with the electromagnet (32); The length of the second arm (333) is greater than the length of the first arm (332), and the moving contact (5) is arranged at one end of the second arm (333); The limiting portion (34) comprises a limiting seat (341), a linkage plate (342), a first limiting block (343) and a second limiting block (344); the linkage plate (342) is slidably connected to the limiting seat (341); the linkage plate (342) is provided with a first limiting hole (3421), a second limiting hole (3422) and a linkage groove (3423); the first limiting block (343) is slidably matched with the first limiting hole (3421); the second limiting block (344) is slidably matched with the second limiting hole (3422); one end of the third arm (334) is located in the linkage groove (3423); When the moving contact (5) and the stationary contact (4) are separated, the first limiting block (343) is separated from the first limiting hole (3421), and the second limiting block (344) is limitedly engaged with the second limiting hole (3422); When the electromagnet (32) drives the rotating part (33) to rotate, the third arm (334) pulls the linkage plate (342) to move through the linkage groove (3423), and at this time, the first limit block (343) is limitedly engaged with the first limit hole (3421), and the second limit block (344) is separated from the second limit hole (3422).

2. The self-resetting over-voltage and under-voltage protector according to claim 1 is characterized in that: The first limit block (343) and the second limit block (344) both include a mounting seat, a driving spring (35) and a push pin (36); a sliding groove is provided in the limit seat (341); the mounting seat is slidably connected in the sliding groove; and a return spring (37) is provided between the mounting seat and the limit seat (341); The driving spring (35) and the ejector pin (36) are both arranged in the mounting seat, and the driving spring (35) is used to drive the ejector pin (36) to move in the direction of the linkage plate (342); The circuit unit (2) comprises a circuit board (21), two groups of card blocks are arranged on the circuit board (21), and two groups of card slots are arranged on the housing (31). When the two card blocks are respectively inserted into the two card slots, the two card blocks respectively push the two mounting seats to move.

3. The self-resetting over-voltage and under-voltage protector according to claim 2 is characterized in that: The card blocks are respectively a first card block (22) and a second card block (23); the mounting seats are respectively a first mounting seat (38) and a second mounting seat (39); the end of the first card block (22) and the bottom of the first mounting seat (38) are both provided with matching inclined surfaces (381); when the first card block (22) is inserted into the card slot, the first card block (22) pushes the first mounting seat (38) to move in a direction close to the linkage plate (342); The end of the second clamping block (23) and the middle of the second mounting seat (39) are both provided with linkage inclined surfaces (391); when the second clamping block (23) is inserted into the clamping slot, the second clamping block (23) pushes the second mounting seat (39) to move in a direction away from the linkage plate (342).

4. The self-resetting over-voltage and under-voltage protector according to claim 1 is characterized in that: The housing comprises an upper housing (1) and a lower housing (11), and both ends of the upper housing (1) and the lower housing (11) are provided with interconnected connection structures (12); The upper end of the upper housing (1) is provided with an adjusting member (13), the upper end of the shell (31) is provided with a communicating hole (311), and the lower end of the adjusting member (13) passes through the communicating hole (311) and is inserted into the shell (31).

5. The self-resetting over-voltage and under-voltage protector according to claim 4 is characterized in that: A limiting member (6) is slidably connected inside the housing (31), and the limiting member (6) is located between the moving contact (5) and the stationary contact (4). When the moving contact (5) approaches the stationary contact (4), the moving contact (5) can push the limiting member (6) to move horizontally; The upper end of the limiting member (6) and the lower end of the adjusting member (13) are provided with a linkage structure (7) that is linked to each other.

6. The self-resetting over-voltage and under-voltage protector according to claim 5 is characterized in that: The limiting member (6) comprises a limiting frame (61), a moving block (62) and a limiting spring (63); the limiting frame (61) is fixedly installed in the housing (31); a sliding cavity is arranged in the limiting frame (61); the moving block (62) is slidably connected in the sliding cavity; and the limiting spring (63) is arranged between the moving block (62) and the inner wall of the limiting frame (61); The upper end of the limiting frame (61) is provided with a connecting groove, and the linkage structure (7) includes a connecting rod (71) arranged on the upper end of the moving block (62), and the upper end of the connecting rod (71) extends out of the connecting groove and is connected to the adjusting member (13).

7. The self-resetting over-voltage and under-voltage protector according to claim 6 is characterized in that: The adjusting member (13) comprises an air seat (14), a movable plate (15), an air vent (16) and an air guide rod (17); the movable plate (15) is slidably connected in the air seat (14); one end of the air guide rod (17) is connected to the air seat (14) through the air vent (16); The limiting frame (61) is provided with an air inlet passage, and the other end of the air guide rod (17) is connected to the air inlet passage; The linkage rod (71) is slidably connected to the lower end of the air seat (14), and the movable plate (15) is connected to the external linkage rod (71) via a connecting rope. When the linkage rod (71) moves, it can drive the movable plate (15) to move.

8. The self-resetting over-voltage and under-voltage protector according to claim 7 is characterized in that: The limiting frame (61) is provided with a first air duct (64) and a second air duct (65); the limiting frame (61) is provided with a first air outlet and a second air outlet on a side facing the moving contact (5); the first air outlet is communicated with the first air duct (64), and the second air outlet is communicated with the second air duct (65); The air guide rod (17) is connected to the first air guide channel (64) or the second air guide channel (65), and an adjustment mechanism (8) for adjusting the position of the air guide rod (17) is arranged in the limiting frame (61).

9. The self-resetting over-voltage and under-voltage protector according to claim 8 is characterized in that: The adjustment mechanism (8) comprises a driving rack (81) and a driving gear (82); the driving gear (82) is rotatably mounted in a limiting frame (61); the driving rack (81) is mounted on a moving block (62); the moving block (62) can drive the driving gear (82) to rotate 15° to 30° during movement; and the driving gear (82) is arranged in linkage with the air guide rod (17).

10. The self-resetting over-voltage and under-voltage protector according to claim 9 is characterized in that: The air guide rod (17) comprises a first end (171), a second end (172) and a third end (173), wherein the first end (171) is connected to the air seat (14); The second end (172) is mounted on the driving gear (82) in a linkage manner; The limiting frame (61) is provided with a movable groove, the entrance of the first air inlet channel (64) and the entrance of the second air inlet channel (65) are respectively located at two ends of the movable groove, and the third end (173) is slidably connected in the movable groove; During the opening process, the gas in the gas seat (14) is blown from the first end (171) to the third end (173).

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