Residual-current circuit breaker

Abstract

The utility model relates to a residual-current circuit breaker, which comprises a shell, a connecting rod, a handle, a moving contact operating mechanism and a tripping assembly, the moving contact operating mechanism is connected with a moving contact, the tripping assembly is connected with a static contact, and the handle rotates and drives the moving contact operating mechanism to act so as to realize connection or disconnection of the moving contact and the static contact; the tripping assembly comprises a current tripper, a voltage tripper, a rotating gear, an upper rack connected with the voltage tripper and a lower rack connected with the current tripper, the upper rack and the lower rack are in meshing transmission connection with the rotating gear, and one end of a coil of the current tripper is electrically connected with the static contact. And the voltage tripper is linked with the current tripper to act so as to realize connection or disconnection of the moving contact and the static contact. The circuit breaker has the advantages that the structure is simple, the internal space of the circuit breaker is reasonably utilized, the leakage protection function is achieved, the overall occupied space is reduced, and the installation requirement is met.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a leakage circuit breaker. Background Art

[0002] A circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain time and disconnect current under specified abnormal circuit conditions. It is suitable for overload and short-circuit protection of lines, and can also be used for infrequent operation conversion of lines under normal circumstances. It is mainly used in various places such as industry, commerce, high-rise buildings and residential buildings.

[0003] A leakage circuit breaker is a switch that automatically operates when the leakage current in a circuit exceeds a predetermined value. Commonly used leakage circuit breakers are divided into two types: voltage type and current type, and the current type is further divided into electromagnetic type and electronic type. A leakage circuit breaker is actually a circuit breaker with leakage protection function.

[0004] The existing leakage circuit breaker has a single function. The leakage circuit breaker is usually assembled with an over-voltage switch or an under-voltage switch to realize the functions of circuit overload, short circuit, over-voltage and under-voltage, leakage protection, etc. However, the over-voltage switch or the under-voltage switch is usually a separate device with a complex structure. After being assembled with the leakage circuit breaker, it occupies a large volume. Utility Model Content

[0005] The present application provides a leakage circuit breaker, which has a simple structure, reasonably utilizes the internal space of the circuit breaker and achieves the leakage protection function, so as to reduce the overall occupied space and meet the installation requirements.

[0006] The present application provides a leakage circuit breaker adopting the following technical solution:

[0007] A leakage circuit breaker comprises a housing, a handle rotatably mounted on the housing, and a moving contact operating mechanism and a tripping assembly mounted in the housing; the handle is movably connected to a connecting rod, the other end of the connecting rod is connected to the moving contact operating mechanism, the moving contact operating mechanism is connected to a moving contact, the tripping assembly is connected to a stationary contact, the handle rotates and drives the moving contact operating mechanism to operate so as to connect or disconnect the moving contact with the stationary contact; the tripping assembly comprises a current tripper, a voltage tripper for operating when sensing a leakage fault, a rotating gear rotatably connected to the housing, an upper rack connected to the voltage tripper, and a lower rack connected to the current tripper, the upper rack and the lower rack are respectively meshed and transmission-connected with the rotating gear, one end of the coil of the current tripper is electrically connected to the stationary contact, the voltage tripper links the current tripper to operate so as to connect or disconnect the moving contact with the stationary contact.

[0008] Preferably, the voltage release includes a main body mounted on the shell, an electromagnetic coil mounted on the main body, an iron core slide rod with one end slidably mounted in the electromagnetic coil, and a permanent magnet mounted on one side of the main body; the other end of the iron core slide rod is passed through the other side of the main body, and the end is connected to the upper rack.

[0009] Preferably, the current release includes a moving iron core, a stationary iron core, a reset spring and a push rod, the lower rack acts on the push rod, the reset spring is installed between the stationary iron core and the moving iron core and applies a force to the moving iron core away from the stationary iron core; one end of the moving iron core facing the stationary iron core abuts against the push rod; when the current passing through the current release is too large, the moving iron core approaches the stationary iron core, causing the push rod to extend and hit the moving contact operating mechanism to achieve connection or disconnection between the moving contact and the stationary contact.

[0010] Preferably, the current release also includes a drive shaft slidably inserted into the moving iron core and a reaction spring; the drive shaft is fixedly connected to the push rod, the reaction spring applies a force on the drive shaft away from the static iron core, and the lower rack acts on the drive shaft.

[0011] Preferably, the housing is provided with an inlet terminal and an outlet terminal for connecting a wire, the voltage release is connected in parallel to the inlet terminal, the static contact is electrically connected to the inlet terminal, and the moving contact is electrically connected to the outlet terminal.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] The handle is rotated to drive the moving contact operating mechanism to move, so as to achieve contact or separation between the moving contact and the static contact, thereby achieving connection or disconnection between the incoming and outgoing terminals, that is, achieving the closing or opening of the circuit breaker; through the monitoring of the current release and the voltage release in the tripping assembly, when the current or voltage is abnormal, the current release or the voltage release is operated to cause the moving contact operating mechanism to rotate, so as to achieve contact or separation between the moving contact and the static contact, thereby achieving connection or disconnection between the incoming and outgoing terminals, and finally achieving the closing or opening of the circuit breaker; by monitoring the current and voltage abnormalities and feeding back to the leakage circuit breaker, it has a simple structure, reasonably utilizes the internal space of the circuit breaker and achieves the leakage protection function, so as to reduce the overall occupied space and meet the installation requirements;

[0014] The voltage condition is monitored by the voltage release. When there is an abnormal leakage or other voltage abnormality, according to the principle of the shortest magnetic circuit, the driving force that causes the iron core slide bar to move toward the center of the coil magnetic field of the electromagnetic coil causes the iron core slide bar to move toward the permanent magnet. The iron core slide bar drives the upper rack to move, prompting the rotating wheel to drive the lower rack to move. The action of the lower rack causes the current release to operate to achieve the connection or disconnection of the moving contact and the static contact.

[0015] When the current passing through the current release is too large, the moving iron core is attracted and approaches the static iron core, the reset spring is compressed, the moving iron core contacts the push rod, causing its end to move and hit the moving contact operating mechanism, and the moving contact operating mechanism rotates to disconnect the moving contact from the static contact; when the power supply voltage is within the normal range, the electromagnetic force generated by the magnetic coil overcomes the suction force between the permanent magnet and the iron core slide rod, the permanent magnet and the iron core slide rod are separated, the upper rack drives the rotating wheel to rotate and moves the lower rack away from the current release, at this time the reaction spring resets and acts on the drive shaft, causing the push rod to return to its position, and the static contact on the moving contact operating mechanism loses its resistance, at this time the handle can be manually opened or closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the leakage circuit breaker;

[0017] Figure 2 This is a front view of the residual current circuit breaker with one side of the housing removed;

[0018] Figure 3 It is a schematic diagram of the structure of the trip assembly and the moving contact operating mechanism;

[0019] Figure 4 It is a schematic diagram of the structure of the trip assembly;

[0020] Figure 5 is a cross-sectional view of the trip assembly.

[0021] Explanation of the accompanying drawings: 1. Shell; 11. Inlet terminal; 12. Outlet terminal; 2. Moving contact; 3. Stationary contact; 4. Handle; 5. Connecting rod; 6. Moving contact operating mechanism; 7. Tripping assembly; 71. Current tripper; 711. Moving iron core; 712. Stationary iron core; 713. Reset spring; 714. Push rod; 715. Reaction spring; 716. Drive shaft; 72. Voltage tripper; 721. Main body; 722. Electromagnetic coil; 723. Iron core slide bar; 724. Permanent magnet; 73. Rotating gear; 74. Upper rack; 75. Lower rack. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings.

[0023] The embodiment of the present application discloses a leakage circuit breaker.

[0024] Reference Figure 1 , Figure 2The leakage circuit breaker includes a housing 1, a moving contact 2, a stationary contact 3, a handle 4 rotatably mounted on the housing 1, a connecting rod 5 with one end movably connected to the handle 4, and a moving contact operating mechanism 6 and a tripping assembly 7 installed in the housing 1, the other end of the connecting rod 5 is connected to the moving contact operating mechanism 6, the moving contact 2 is installed on the moving contact operating mechanism 6, and the stationary contact 3 is connected to the tripping assembly 7.

[0025] Reference Figure 2 , Figure 3 , wherein an incoming terminal 11 and an outgoing terminal 12 for connecting the line are arranged on both sides of the housing 1, the static contact 3 is electrically connected to the incoming terminal 11, and the moving contact 2 is electrically connected to the outgoing terminal 12; the handle 4 rotates and drives the moving contact operating mechanism 6 to realize the connection or disconnection of the moving contact 2 and the static contact 3, thereby realizing the connection or disconnection of the incoming terminal 11 and the outgoing terminal 12, that is, realizing the closing or opening of the circuit breaker.

[0026] The specific structure and principle of the moving contact operating mechanism 6 are consistent with those in the patent application document with Chinese patent application number 202021663014.9 and announcement date January 15, 2021, and they are all owned by the same patent owner, so they will not be repeated here.

[0027] Reference Figures 2 to 5 , wherein the trip assembly 7 includes a current release 71, a voltage release 72 for operating when sensing a leakage fault, a rotating gear 73 rotatably connected to the housing 1, an upper rack 74 connected to the voltage release 72, and a lower rack 75 connected to the current release 71, the voltage release 72 is connected in parallel to the incoming line terminal 11; the upper rack 74 and the lower rack 75 are respectively meshed and transmission-connected with the rotating gear 73, one end of the coil of the current release 71 is electrically connected to the static contact 3, and the voltage release 72 links the current release 71 to operate to realize the connection or disconnection of the moving contact 2 and the static contact 3.

[0028] The voltage release 72 includes a main body 721 installed on the shell 1, an electromagnetic coil 722 installed on the main body 721, an iron core slide rod 723 with one end slidably installed in the electromagnetic coil 722, and a permanent magnet 724 installed on one side of the main body 721; the other end of the iron core slide rod 723 is passed through the other side of the main body 721, and the end is connected to the upper rack 74.

[0029] The voltage release 72 has protection functions such as overload, circuit break, leakage, undervoltage, overvoltage, imbalance, underfrequency, overfrequency, reverse power, and phase sequence. The voltage condition is monitored by the voltage release 72. When there is leakage abnormality or other voltage abnormality, according to the principle of the shortest magnetic circuit, the driving force that makes the iron core slide bar 723 move toward the center of the coil magnetic field of the electromagnetic coil 722 causes the iron core slide bar 723 to move toward the direction of the permanent magnet 724. The iron core slide bar 723 drives the upper rack 74 to move, prompting the rotating wheel to drive the lower rack 75 to move, and the lower rack 75 moves to activate the current release 71 to realize the connection or disconnection of the moving contact 2 and the static contact 3.

[0030] The current release 71 includes a moving iron core 711, a stationary iron core 712, a reset spring 713, a push rod 714, a reaction spring 715, and a drive shaft 716 slidably inserted into the moving iron core 711; the lower rack 75 acts on the push rod 714, the reset spring 713 is installed between the stationary iron core 712 and the moving iron core 711 and applies a force to the moving iron core 711 away from the stationary iron core 712; the end of the moving iron core 711 facing the stationary iron core 712 is in contact with the push rod 714, and the drive shaft 716 is in contact with the push rod 714. The rod 714 is fixedly connected, and the reaction spring 715 applies a force on the drive shaft 716 in the direction away from the static iron core 712, and the lower rack 75 acts on the drive shaft 716; when the current passing through the current release 71 is too large, the moving iron core 711 is attracted and approaches the static iron core 712, the reset spring 713 is compressed, and the moving iron core 711 contacts the push rod 714 to move its end and hit the moving contact operating mechanism 6, and the moving contact operating mechanism 6 rotates to disconnect the moving contact 2 from the static contact 3.

[0031] The implementation principle is: by connecting the voltage release 72 in parallel to the power supply side of the leakage circuit breaker, it can play the role of undervoltage and zero voltage protection. When the power supply voltage is normal, the handle 4 is pulled, the moving contact 2 of the moving contact operating mechanism 6 contacts the static contact 3, the release mechanism is locked in the closing position, and the circuit breaker is put into operation. When the power supply side is out of power or the power supply voltage is too low, the electromagnetic force generated by the electromagnetic coil 722 is insufficient to overcome the suction between the permanent magnet 724 and the iron core slide bar 723, the iron core slide bar 723 is moved toward the permanent magnet 724, the iron core slide bar 723 drives the upper rack 74 to move, prompting the rotating wheel to drive the lower rack 75 to move, the lower rack 75 moves to make the drive shaft 716 drive the push rod 714 to move to achieve the disconnection between the moving contact 2 and the static contact 3, the reaction spring 715 is compressed, and at this time the release mechanism automatically opens the leakage circuit breaker, playing the role of undervoltage and zero voltage protection.

[0032] When the power supply voltage is within the normal range, the electromagnetic force generated by the magnetic coil overcomes the suction force between the permanent magnet 724 and the iron core slide bar 723, and the permanent magnet 724 and the iron core slide bar 723 are separated. The upper rack 74 drives the rotating wheel to rotate and moves the lower rack 75 away from the current release 71. At this time, the reaction spring 715 is reset and acts on the drive shaft 716, prompting the push rod 714 to return to its position, and the static contact 3 on the moving contact operating mechanism 6 loses the resistance force. At this time, the handle 4 can be manually opened or closed; by monitoring the current and voltage abnormalities and feeding back to the leakage circuit breaker, it has a simple structure, rationally utilizes the internal space of the circuit breaker and achieves the leakage protection function, so as to reduce the overall occupied space and meet the installation requirements.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A leakage circuit breaker, comprising a housing (1), a handle (4) rotatably mounted on the housing (1), and a moving contact operating mechanism (6) and a trip assembly (7) mounted in the housing (1); the handle (4) is movably connected to a connecting rod (5), the other end of the connecting rod (5) is connected to the moving contact operating mechanism (6), the moving contact operating mechanism (6) is connected to a moving contact (2), the trip assembly (7) is connected to a stationary contact (3), the handle (4) rotates and drives the moving contact operating mechanism (6) to operate so as to realize the connection or disconnection of the moving contact (2) and the stationary contact (3); characterized in that: The release assembly (7) comprises a current release (71), a voltage release (72) for operating when sensing a leakage fault, a rotating gear (73) rotatably connected to the housing (1), an upper rack (74) connected to the voltage release (72), and a lower rack (75) connected to the current release (71); the upper rack (74) and the lower rack (75) are respectively meshed and transmission-connected with the rotating gear (73); one end of the coil of the current release (71) is electrically connected to the static contact (3); the voltage release (72) is linked to the current release (71) to operate so as to achieve connection or disconnection of the moving contact (2) and the static contact (3).

2. The residual current circuit breaker according to claim 1, characterized in that: The voltage release (72) comprises a body (721) mounted on the housing (1), an electromagnetic coil (722) mounted on the body (721), an iron core slide bar (723) with one end slidably mounted in the electromagnetic coil (722), and a permanent magnet (724) mounted on one side of the body (721); the other end of the iron core slide bar (723) is passed through the other side of the body (721), and the end is connected to the upper rack (74).

3. The residual current circuit breaker according to claim 2, characterized in that: The current release (71) comprises a moving iron core (711), a stationary iron core (712), a reset spring (713) and a push rod (714); the lower rack (75) acts on the push rod (714); the reset spring (713) is installed between the stationary iron core (712) and the moving iron core (711) and applies a force to the moving iron core (711) to move away from the stationary iron core (712); one end of the moving iron core (711) facing the stationary iron core (712) abuts against the push rod (714); when the current passing through the current release (71) is too large, the moving iron core (711) approaches the stationary iron core (712) so that the push rod (714) extends out and hits the moving contact operating mechanism (6), thereby realizing the connection or disconnection of the moving contact (2) and the stationary contact (3).

4. The residual current circuit breaker according to claim 3, characterized in that: The current release (71) further comprises a drive shaft (716) and a reaction spring (715) slidably inserted into the moving iron core (711); the drive shaft (716) is fixedly connected to the push rod (714); the reaction spring (715) applies a force to the drive shaft (716) in a direction away from the stationary iron core (712); and the lower rack (75) acts on the drive shaft (716).

5. The residual current circuit breaker according to claim 1, characterized in that: The housing (1) is provided with an inlet terminal (11) and an outlet terminal (12) for connecting a wire, the voltage release (72) is connected in parallel to the inlet terminal (11), the stationary contact (3) is electrically connected to the inlet terminal (11), and the moving contact (2) is electrically connected to the outlet terminal (12).

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