A trip unit and a circuit breaker

Abstract

The present invention discloses a release and a circuit breaker, relating to the technical field of low-voltage electrical appliances, and comprising: a bracket; an electromagnetic mechanism, which includes a coil, a coil bobbin, a moving iron core, a static iron core and a permanent magnet; the static iron core is arranged inside the coil bobbin, the moving iron core is movably arranged inside the coil bobbin, and the permanent magnet is arranged at one end of the coil bobbin close to the static iron core; a secondary amplification mechanism, which includes a push rod mechanism, a energy storage spring and a locking mechanism; the energy storage spring is arranged on the push rod mechanism, the locking mechanism is arranged at one end of the energy storage spring, the locking mechanism is fixed on the bracket, one end of the energy storage spring close to the locking mechanism is fixedly connected with the bracket, and the push rod mechanism is slidably connected with the bracket; one end of the moving iron core cooperates with the static iron core, and the other end of the moving iron core passes through the coil bobbin and cooperates with the locking mechanism. The release of the present invention realizes the integration of an under-voltage release and a shunt release, reduces the overall structural volume of the release, and expands the application range of the release.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly relates to a release and a circuit breaker. Background Art

[0002] At present, the shunt release and the under-voltage release operate independently of each other. During installation, they need to be installed at different positions of the circuit breaker respectively, which makes it difficult to install other functional accessories in the circuit breaker without changing the volume of the circuit breaker; moreover, the shunt release and the under-voltage release are mostly installed inside the circuit breaker, which is not convenient for quick installation and debugging, and has relatively high requirements for installation operation techniques. At the same time, the minimum voltage of the shunt release is 24V DC, which cannot meet the requirement of the minimum voltage of the shunt drive of the circuit breaker being lower than 24V DC, thus limiting the scope of use of the shunt release. Summary of the Invention

[0003] 1. Technical Problems to be Solved by the Invention

[0004] Aiming at the technical problem that the existing shunt release and under-voltage release operate independently and need to be installed at different positions of the circuit breaker respectively during installation, the present invention provides a release and a circuit breaker, which not only realizes the integration of the shunt release and the under-voltage release, simplifies the overall structure, but also expands the scope of use of the release.

[0005] 2. Technical Solutions

[0006] To solve the above problems, the technical solutions provided by the present invention are as follows:

[0007] A release, comprising: a bracket; an electromagnetic mechanism, the electromagnetic mechanism is arranged inside the bracket, and the electromagnetic mechanism includes a coil, a coil bobbin, a moving iron core, a static iron core and a permanent magnet; the coil is arranged on the coil bobbin, the static iron core is arranged inside the coil bobbin, the moving iron core is movably arranged inside the coil bobbin, and the permanent magnet is arranged at one end of the coil bobbin close to the static iron core; a secondary amplification mechanism, the secondary amplification mechanism is slidably arranged inside the bracket, and the secondary amplification mechanism includes a push rod mechanism, a storage spring and a locking mechanism; the storage spring is arranged on the push rod mechanism, the locking mechanism is arranged at one end of the storage spring, the locking mechanism is fixed on the bracket, one end of the storage spring close to the locking mechanism is fixedly connected to the bracket, the push rod mechanism is slidably connected to the bracket, and the push rod mechanism realizes locking and separation with the locking mechanism through sliding inside the bracket; one end of the moving iron core cooperates with the static iron core, and the other end of the moving iron core passes through the coil bobbin and cooperates with the locking mechanism.

[0008] In the present invention, when the release is in the initial state, the push rod mechanism is separated from the latch mechanism. Under the action of the energy storage spring, the push rod mechanism pushes the moving iron core to move along the channel in the coil bobbin towards the static iron core, and makes the moving and static iron cores in the attracted state. When the handle is used to push the circuit breaker to latch, the lever moves, causing the lever shaft to push the push rod mechanism to move towards the latch mechanism. Since the energy storage spring is provided on the push rod mechanism and the latch mechanism is fixed on the bracket, and one end of the energy storage spring close to the latch mechanism is fixedly connected to the bracket, when the push rod mechanism moves in the bracket, the energy storage spring is compressed. When the push rod mechanism moves and latches with the latch mechanism, the latch mechanism limits the push rod mechanism to prevent the push rod mechanism from moving away from the latch mechanism under the action of the energy storage spring, so that the energy storage spring is always in the energy storage state, making the entire secondary amplification mechanism in the energy storage state, and the moving iron core and the static iron core are still attracted together under the action of the permanent magnet, and the whole mechanism is in a stable state.

[0009] After the coil is energized to generate a magnetic field, under the action of the magnetic field, the moving iron core and the static iron core are quickly released. One end of the moving iron core impacts the latch mechanism, causing the latch mechanism to separate from the push rod mechanism, thereby opening the secondary amplification mechanism in the energy storage state. The push rod mechanism quickly slides to the initial position under the action of the energy storage spring. At the same time, since the push rod mechanism hooks the trip rod (used for opening and closing the circuit breaker) on the circuit breaker, when the push rod mechanism returns to the initial position, it will drive the trip rod, thereby tripping the circuit breaker. When the push rod mechanism returns to the initial position, it drives the moving iron core to close with the static iron core again, completing an action cycle.

[0010] By setting specific cooperative connection relationships among the moving iron core, the static iron core, the permanent magnet, the push rod mechanism, the energy storage spring and the latch mechanism in this application, the release in the application can achieve the opening of the circuit breaker whether under the signal of the under-voltage release or the signal of the shunt release. That is, the release of the present invention can not only achieve the effect of the under-voltage release, but also achieve the effect of the shunt release, realizing the integration of the under-voltage release and the shunt release, and reducing the overall structural volume of the release. At the same time, due to the setting of the permanent magnet in the electromagnetic mechanism, a smaller magnetic field generated after the coil is energized can overcome the attraction of the permanent magnet to the moving iron core and release the moving iron core, so that the moving iron core moves at high speed to impact the latch mechanism of the secondary amplification mechanism and unlock the secondary amplification mechanism; and due to the setting of the permanent magnet, the power of the coil is reduced, so that the coil can work reliably at a rated voltage as low as DC 12V. Compared with the existing shunt release with a minimum voltage of DC 24V, when the release in the present invention is used as a shunt release, the use range of the shunt release is expanded.

[0011] Optionally, it further includes an auxiliary alarm mechanism, and the auxiliary alarm mechanism is arranged on one side of the bracket.

[0012] Optionally, the auxiliary alarm mechanism includes a substrate, a return spring, an alarm switch, an auxiliary switch, a linkage mechanism, and a push rod; the alarm switch and the auxiliary switch are respectively arranged at two ends of the substrate, one end of the return spring is fixed on the substrate, the other end of the return spring is connected to the push rod, the push rod is slidably connected to the substrate, the push rod and the auxiliary switch are connected in cooperation through a limiting structure, the linkage mechanism is rotatably arranged on the substrate, one end of the linkage mechanism is connected in cooperation with the push rod, and the other end of the linkage mechanism is connected in cooperation with the alarm switch.

[0013] Optionally, a chute is arranged on the substrate, and a protrusion cooperating with the chute is arranged on the push rod.

[0014] Optionally, the push rod mechanism includes a base and a push rod, the electromagnetic mechanism is arranged below the base, the energy storage spring is arranged on the base, a locking groove cooperating with the locking mechanism is arranged on the base, one end of the base is provided with an extension part which is perpendicular to the base, the push rod is arranged on the extension part, a slideway is formed on the base close to the extension part, a channel is arranged through the extension part, and the channel is communicated with the slideway.

[0015] Optionally, the push rod is arranged on one side of the channel, and a hook part is arranged at the end of the push rod.

[0016] Optionally, the locking mechanism includes a lock, a lock elastic part, and a lock shaft, the lock elastic part is sleeved on the lock shaft, the lock is arranged on the lock shaft, and both ends of the lock shaft are respectively fixed on the bracket.

[0017] Optionally, the electromagnetic mechanism further includes a yoke, a fixing plate, and a spring, the yoke is arranged at one end of the coil bobbin, the spring is sleeved on the moving iron core, one end of the spring is connected to the yoke, and the other end of the spring is connected to the fixing plate.

[0018] Optionally, it further includes a housing, and the bracket, the electromagnetic mechanism, the secondary amplification mechanism, and the auxiliary alarm mechanism are arranged in the housing.

[0019] Meanwhile, the present invention also provides a circuit breaker, including the above-mentioned release.

[0020] 3. Beneficial effects

[0021] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0022] (1) The release proposed in the embodiments of the present application has a simple structure. By setting specific cooperative connection relationships among the moving iron core, static iron core, permanent magnet, push rod mechanism, energy storage spring, and locking mechanism, the release in the application can achieve the disconnection of the circuit breaker whether under the signal of the undervoltage release or the signal of the shunt release. That is, the release of the present application can not only achieve the effect of the undervoltage release but also the effect of the shunt release, realizing the integration of the undervoltage release and the shunt release and reducing the overall structural volume of the release. At the same time, due to the setting of the permanent magnet in the electromagnetic mechanism, a relatively small magnetic field generated after the coil is energized can overcome the attraction of the permanent magnet to the moving iron core and release the moving iron core, causing the moving iron core to move at high speed and impact the locking mechanism of the secondary amplification mechanism to unlock the secondary amplification mechanism. And due to the setting of the permanent magnet, the power of the coil is reduced, enabling the coil to work reliably at a rated voltage as low as DC 12V. Compared with the existing shunt release with a minimum voltage of DC 24V, when the release in the present application is used as a shunt release, the application range of the shunt release is expanded.

[0023] (2) The release proposed in the embodiments of the present application has an alarm function by setting an auxiliary alarm mechanism.

[0024] (3) The release proposed in the embodiments of the present application enables the ejector rod to slide on the substrate by setting the cooperation of the chute and the protrusion, and at the same time plays a certain guiding role to ensure that the ejector rod moves up and down on the substrate.

[0025] (4) The release proposed in the embodiments of the present application is provided with a hook portion at one end of the push rod, which is convenient for the push rod to hook with the release rod, thereby ensuring the release of the circuit breaker.

[0026] (5) The release proposed in the embodiments of the present application, through the structural setting of the push rod mechanism, enables the locking mechanism to pass through the slideway and the channel when the push rod mechanism makes a reciprocating linear motion in the bracket, while realizing the engagement between the locking mechanism and the locking groove and the limitation between the locking mechanism and the push rod mechanism, and the locking mechanism is connected to the end of the moving iron core.

[0027] (6) The circuit breaker proposed in the embodiments of the present application adopts the above release. Since the release realizes the integration of the shunt release and the undervoltage release, the volume of the entire release structure is greatly reduced, enabling the release to be installed in only one placement cavity on the circuit breaker. Without changing the overall volume of the circuit breaker, part of the space is saved for the circuit breaker, and the installation of other auxiliary accessories on the circuit breaker can be increased, thereby increasing other functions of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a release proposed in an embodiment of the present invention.

[0029] Figure 2 The partial structural schematic diagram of a release proposed by an embodiment of the present invention.

[0030] Figure 3 The structural schematic diagram of a push rod mechanism in a release proposed by an embodiment of the present invention.

[0031] Figure 4 The structural schematic diagram of an electromagnetic mechanism in a release proposed by an embodiment of the present invention.

[0032] Figure 5 The structural schematic diagram of an auxiliary alarm mechanism in a release proposed by an embodiment of the present invention.

[0033] Figure 6 The structural schematic diagram of a protective plate in a release proposed by an embodiment of the present invention.

[0034] Figure 7 The partial structural schematic diagram of a circuit breaker containing a release proposed by an embodiment of the present invention.

[0035] Figure 8 The partial top view of a circuit breaker containing a release proposed by an embodiment of the present invention. Detailed implementation manners

[0036] To further understand the content of the present invention, the present invention will be described in detail in combination with the accompanying drawings and embodiments.

[0037] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings. The terms "first", "second", etc. used in the present invention are set for the convenience of describing the technical solution of the present invention and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present invention. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1

[0039] Combined with the attached Figure 1-8, this embodiment provides a release, comprising: a bracket 1; an electromagnetic mechanism 2, the electromagnetic mechanism 2 is disposed within the bracket 1, the electromagnetic mechanism 2 includes a coil 21, a coil bobbin 22, a moving iron core 23, a static iron core 24 and a permanent magnet 25; the coil 21 is disposed on the coil bobbin 22, the static iron core 24 is disposed within the coil bobbin 22, the moving iron core 23 is movably disposed within the coil bobbin 22, and the permanent magnet 25 is disposed at one end of the coil bobbin 22 close to the static iron core 24; a secondary amplification mechanism 3, the secondary amplification mechanism 3 is slidably disposed within the bracket 1, the secondary amplification mechanism 3 includes a push rod mechanism 31, a storage spring 32 and a locking mechanism 34; the storage spring 32 is disposed on the push rod mechanism 31, the locking mechanism 34 is disposed at one end of the storage spring 32, the locking mechanism 34 is fixed to the bracket 1, one end of the storage spring 32 close to the locking mechanism 34 is fixedly connected to the bracket 1, the push rod mechanism 31 is slidably connected to the bracket 1, and the push rod mechanism 31 realizes locking and separation with the locking mechanism 34 through sliding within the bracket 1; one end of the moving iron core 23 cooperates with the static iron core 24, and the other end of the moving iron core 23 passes through the coil bobbin 22 and cooperates with the locking mechanism 34.

[0040] In practical applications, as Figure 7 and Figure 8 shown, a handle 7 and a lever 8 are provided on the circuit breaker. The handle 7 is used to realize the latching and tripping of the circuit breaker. Operating the handle 7 can drive the lever 8 to move, and the lever 8 cooperates with the push rod mechanism 31 through a lever shaft 9 to realize the sliding of the push rod mechanism 31 within the bracket 1. In this application, when the release is in the initial state, the push rod mechanism 31 and the locking mechanism 34 are in a separated state. Under the action of the storage spring 32, the push rod mechanism 31 pushes the moving iron core 23 to move along the channel 316 within the coil bobbin 22 towards the static iron core 24, and the moving and static iron cores 24 are in an attracted state.

[0041] When using the handle 7 to push the circuit breaker to latch, the lever moves, causing the lever shaft 9 to push the push rod mechanism 31 to move towards the locking mechanism 34. Since the storage spring 32 is disposed on the push rod mechanism 31 and the locking mechanism 34 is fixed to the bracket 1, and one end of the storage spring 32 close to the locking mechanism 34 is fixedly connected to the bracket 1, therefore, when the push rod mechanism 31 moves within the bracket 1, the storage spring 32 is compressed. When the push rod mechanism 31 moves and latches with the locking mechanism 34, the locking mechanism 34 limits the push rod mechanism 31 to prevent the push rod mechanism 31 from moving away from the locking mechanism 34 under the action of the storage spring 32, so that the storage spring 32 is always in an energy storage state, making the entire secondary amplification mechanism 3 in an energy storage state, and the moving iron core 23 and the static iron core 24 remain attracted together under the action of the permanent magnet 25, and the entire mechanism is in a stable state.

[0042] After the coil 21 is energized, a magnetic field is generated. Under the action of the magnetic field, the moving iron core 23 and the static iron core 24 are quickly released. One end of the moving iron core 23 impacts the locking mechanism 34, causing the locking mechanism 34 to separate from the push rod mechanism 31, thereby opening the secondary amplification mechanism 3 in the energy storage state. The push rod mechanism 31 quickly slides to the initial position under the action of the energy storage spring 32. At the same time, since the push rod mechanism 31 hooks the trip rod 12 on the circuit breaker (used for opening and closing the circuit breaker), when the push rod mechanism 31 returns to the initial position, it will drive the trip rod 12, thereby tripping the circuit breaker. When the push rod mechanism 31 returns to the initial position, it drives the moving iron core 23 to close with the static iron core 24 again, completing an action cycle.

[0043] By setting specific mating connection relationships among the moving iron core 23, the static iron core 24, the permanent magnet 25, the push rod mechanism 31, the energy storage spring 32, and the locking mechanism 34 in this application, the release in the application can achieve the opening of the circuit breaker whether under the signal of the under-voltage release or the signal of the shunt release. That is, the release in this application can not only achieve the effect of the under-voltage release but also the effect of the shunt release, realizing the integration of the under-voltage release and the shunt release and reducing the overall structural volume of the release. At the same time, due to the setting of the permanent magnet 25 in the electromagnetic mechanism 2, a smaller magnetic field generated after the coil 21 is energized can overcome the attraction of the permanent magnet 25 to the moving iron core 23 and release the moving iron core 23, causing the moving iron core 23 to move at high speed to impact the locking mechanism 34 of the secondary amplification mechanism 3 and unlock the secondary amplification mechanism 3; and due to the setting of the permanent magnet 25, the power of the coil 21 is reduced, enabling the coil 21 to work reliably at a rated voltage as low as DC 12V. Compared with the existing shunt release with a minimum voltage of DC 24V, when the release in this application is used as a shunt release, the application range of the shunt release is expanded.

[0044] Embodiment 2

[0045] Combined with the attached Figure 1 , compared with the technical solution of Embodiment 1, the release of this embodiment further includes an auxiliary alarm mechanism 4, and the auxiliary alarm mechanism 4 is arranged on one side of the bracket 1. The setting of the auxiliary alarm mechanism 4 enables the release to have an alarm function.

[0046] Embodiment 3

[0047] Combined with the attached Figure 1 and the attached Figure 3, compared with the technical solution of Embodiment 2, the release of this embodiment, the auxiliary alarm mechanism 4 includes a substrate 41, a return spring 42, an alarm switch 43, an auxiliary switch 44, a linkage mechanism 45 and a push rod 46; the alarm switch 43 and the auxiliary switch 44 are respectively arranged at both ends of the substrate 41, one end of the return spring 42 is fixed on the substrate 41, the other end of the return spring 42 is connected to the push rod 46, the push rod 46 is slidably connected to the substrate 41, the push rod 46 and the auxiliary switch 44 are connected by a limiting structure in a matching manner, the linkage mechanism 45 is rotatably arranged on the substrate 41, one end of the linkage mechanism 45 is connected to the push rod 46 in a matching manner, and the other end of the linkage mechanism 45 is connected to the alarm switch 43 in a matching manner.

[0048] In actual use, as Figure 7-8 shown, a rotating shaft 10 cooperating with the push rod 46 is provided on the circuit breaker, a top plate 11 is provided on the rotating shaft 10, and the top plate 11 is connected to the push rod 46 in different degrees of cooperation under the rotation of the rotating shaft 10. According to the different rotation positions of the rotating shaft 10, it can be divided into three states: closing, opening and free tripping. When the rotating shaft 10 rotates to the opening position, the top plate 11 contacts the end of the push rod 46 and presses against the push rod 46 to slide on the substrate 41. Since the push rod 46 and the auxiliary switch 44 are connected by a limiting structure in a matching manner, therefore, the movement of the push rod 46 will cause a certain pressure on the auxiliary switch 44, making the auxiliary switch 44 change from normally open to normally closed and output a signal. When the rotating shaft continues to rotate upward to the free tripping position, one end of the linkage mechanism 45 is connected to the push rod 46 in a matching manner, the other end of the linkage mechanism 45 is connected to the alarm switch 43 in a matching manner, and the linkage mechanism 45 is rotatably arranged on the substrate 41. Therefore, the linkage mechanism 45 rotates under the action of the push rod 46, making the other end of the linkage mechanism 45 contact the alarm switch 43 and compress the alarm switch 43, making the alarm switch 43 change from normally open to normally closed and output an alarm signal. When the rotating shaft 10 rotates to the closing position, since the top plate 11 on the rotating shaft 10 is separated from the push rod 46, under the elastic force of the return spring 42, the push rod 46 slides in the direction close to the rotating shaft 10 until it returns to the original state. At this time, both the alarm switch 43 and the auxiliary switch 44 change from normally closed to normally open.

[0049] The limiting structure includes a limiting groove and a limiting protrusion. A limiting groove is provided on the side wall of the push rod 46 close to the return spring 42, and a limiting protrusion is provided on the auxiliary switch 44. The limiting groove and the limiting protrusion cooperate to realize the limiting connection between the push rod 46 and the auxiliary switch 44.

[0050] In actual application, the linkage mechanism 45 includes a first link 451 and a second link 452. The first link 451 and the second link 452 are hinged to the substrate 41 through a rotating shaft. The first link 451 is connected to the ejector rod 46 in a matching manner, and the second link 452 is connected to the alarm switch 43 in a matching manner. This setting facilitates the compression of the alarm switch 43 under the movement of the ejector rod 46, changing the alarm switch 43 from normally open to normally closed.

[0051] Embodiment 4

[0052] For the release mechanism of this embodiment, compared with the technical solution of Embodiment 3, a chute (not shown in the figure) is provided on the substrate 41, and a protrusion (not shown in the figure) that cooperates with the chute is provided on the ejector rod 46. The cooperation between the chute and the protrusion enables the ejector rod 46 to slide on the substrate 41, and at the same time plays a certain guiding role to ensure that the ejector rod 46 moves up and down on the substrate 41.

[0053] Embodiment 5

[0054] Combined with the attached Figure 1 and the attached Figure 5 For the release mechanism of this embodiment, compared with any one of the technical solutions of Embodiments 1-4, the push rod mechanism 31 includes a base 311 and a push rod 312. The electromagnetic mechanism 2 is arranged below the base 311, the energy storage spring 32 is arranged on the base 311, a locking groove 313 that cooperates with the locking mechanism 34 is provided on the base 311, an extension part 314 is provided at one end of the base 311, the extension part 314 is perpendicular to the base 311, the push rod 312 is arranged on the extension part 314, a slideway 315 is opened on the base 311 near the extension part 314, and a channel 316 is provided through the extension part 314, and the channel 316 communicates with the slideway 315.

[0055] In actual application, the channel 316 is correspondingly arranged with the end of the moving iron core 23 close to the locking mechanism 34. When the push rod mechanism 31 makes a reciprocating linear motion in the bracket 1, the locking mechanism 34 passes through the slideway 315 and the channel 316. While realizing the engagement between the locking mechanism 34 and the locking groove 313 and the limit between the locking mechanism 34 and the push rod mechanism 31, the locking mechanism 34 is connected to the end of the moving iron core 23. In actual application, the channel 316 is composed of a strip-shaped hole and a circular hole. One end of the strip-shaped hole communicates with the slideway 315, and the other end of the strip-shaped hole communicates with the circular hole.

[0056] In actual application, such as Figure 5As shown, one end of the base 311 away from the extension 314 is provided with a side plate 318. A connecting rod 319 parallel to the base 311 is provided on the side plate 318. The locking groove 313 is provided at one end of the connecting rod 319 away from the side plate 318. This setting facilitates the reciprocating linear motion of the push rod mechanism 31 in the bracket 1, ensuring the engagement and separation of the locking mechanism 34 and the locking groove 313 on the base 311.

[0057] Embodiment 6

[0058] Combined with the attached Figure 5 , compared with the technical solution of Embodiment 5, for the release mechanism of this embodiment, the push rod 312 is arranged on one side of the channel 316, and a hook portion 317 is provided at the end of the push rod 312. The setting of the hook portion 317 facilitates the engagement between the push rod 312 and the release rod, thereby ensuring the release of the circuit breaker.

[0059] Embodiment 7

[0060] Combined with the attached Figure 1-2 , compared with the technical solution of Embodiment 5, for the release mechanism of this embodiment, the locking mechanism 34 includes a lock, a lock elastic member 342 and a lock shaft 343. The lock elastic member 342 is sleeved on the lock shaft 343, the lock is arranged on the lock shaft 343, and both ends of the lock shaft 343 are respectively fixed on the bracket 1.

[0061] In actual use, the lock is rotatably arranged on the lock shaft 343. The lock has a first lock arm 344 and a second lock arm 345. The first lock arm 344 is used for engaging and connecting with the locking groove 313 on the base 311, and the end face of the second lock arm 345 is used for connecting with the moving iron core 23.

[0062] When using the handle 7 to push the circuit breaker to fasten, the lever shaft 9 pushes the base 311 to move towards the locking mechanism 34. Under the action of the lock elastic member 342, the first lock arm 344 of the lock slides into the locking groove 313 and locks the push rod mechanism 31, that is, the limit of the push rod mechanism 31 is realized. At this time, the second lock arm 345 of the lock enters the channel 316 and is connected to the moving iron core 23. After the coil 21 is energized, under the action of the magnetic field, the moving iron core 23 is quickly released, so that the moving iron core 23 impacts the second lock arm 345 of the lock. At this time, the first lock arm 344 is separated from the locking groove 313 on the base 311, so that the push rod mechanism 31 is released. The push rod mechanism 31 moves away from the locking mechanism 34 under the action of the energy storage spring 32 and quickly returns to the initial position.

[0063] In actual use, such as Figure 1 and Figure 6As shown, a protective plate 346 is provided on the bracket 1. A positioning plate 347 is provided on the side of the protective plate 346 away from the locking mechanism 34. A positioning post 348 is provided on the positioning plate 347. One end of the energy storage spring 32 is fixed on the positioning post 348. The protective plate 346 is snap-fitted with the bracket 1. The locking mechanism 34 is arranged in the cavity formed between the protective plate 346 and the bracket 1. This setting can ensure that the energy storage spring 32 is fully compressed when the push rod mechanism 31 moves towards the locking mechanism 34, obtaining a large amount of stored energy. Furthermore, when the push rod mechanism 31 is released, it has a large enough tripping force to ensure the tripping of the circuit breaker. At the same time, the locking mechanism 34 can be effectively protected.

[0064] Embodiment 8

[0065] Combined with the attached Figure 2 and the attached Figure 4 For the release mechanism of this embodiment, compared with the technical solutions of Embodiment 1 or 7, the electromagnetic mechanism 2 further includes a yoke 26, a fixing plate 27 and a spring 28. The yoke 26 is arranged at one end of the coil bobbin 22. The spring 28 is sleeved on the moving iron core 23. One end of the spring 28 is connected to the yoke 26, and the other end of the spring 28 is connected to the fixing plate 27. By providing the fixing plate 27, the spring 28 can be fixed on the moving iron core 23. When the moving iron core 23 moves towards the static iron core 24 in the coil bobbin 22 and attracts the static iron core 24 under the action of the permanent magnet 25, the spring 28 will be compressed. When the coil 21 is energized, under the action of the magnetic field, the moving iron core 23 is released, and under the action of the restoring force of the spring 28, the moving iron core 23 quickly moves away from the static iron core 24 and impacts the locking mechanism 34, causing the locking mechanism 34 to separate from the push rod mechanism 31.

[0066] In practical applications, annular bosses 29 are circumferentially provided at both ends of the coil bobbin 22. The setting of the annular bosses 29 facilitates the placement of the yoke 26 and the setting of the permanent magnet 25.

[0067] Embodiment 9

[0068] For the release mechanism of this embodiment, compared with the technical solution of Embodiment 2, it further includes a housing. The bracket 1, the electromagnetic mechanism 2, the secondary amplification mechanism 3 and the auxiliary alarm mechanism 4 are arranged in the housing. The housing is provided to protect the bracket 1, the electromagnetic mechanism 2 and the secondary amplification mechanism 3. At the same time, the overall structure is made more compact. In practical applications, the housing includes a base (not shown in the figure) and a frame (not shown in the figure). The frame is detachably connected to the base. This setting facilitates assembly and disassembly.

[0069] In actual application, the base is snap-fitted to the frame. The base is provided with snap projections (not shown in the figure), and the frame is provided with snap grooves (not shown in the figure). The snap projections cooperate with the snap grooves to realize the connection between the base and the frame.

[0070] In actual application, as Figure 7-8 shown, the housing includes a first housing 51 and a second housing 52. The second housing 52 communicates with the first housing 51. An opening (not shown in the figure) is provided at the bottom of the second housing 52. The opening 53 is used for the top plate on the rotating shaft to cooperate with the auxiliary alarm mechanism 4. The secondary amplification mechanism 3 and the electromagnetic mechanism 2 are arranged in the first housing 51, and the auxiliary alarm mechanism 4 is arranged in the second housing 52.

[0071] In actual application, a sliding channel (not shown in the figure) is provided on the side wall of the first housing 51. A projection 320 is provided on the side wall of the base 311. The projection 320 slides in the sliding channel and passes through the sliding channel to cooperate with the lever shaft 9 on the circuit breaker.

[0072] Embodiment 10

[0073] This embodiment provides a circuit breaker, including the trip unit described in any one of the technical solutions of Embodiments 1-9. By adopting the above trip unit, since the trip unit realizes the integration of the shunt trip unit and the under-voltage trip unit, the volume of the entire trip unit structure is greatly reduced, so that the trip unit only needs to be installed in a placement cavity on the circuit breaker. Without changing the overall volume of the circuit breaker, part of the space is saved for the circuit breaker, and the installation of other auxiliary accessories on the circuit breaker can be increased, thereby increasing other functions of the circuit breaker.

[0074] The above schematically describes the present invention and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative work without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A release, characterized in that, it includes: a bracket; an electromagnetic mechanism, the electromagnetic mechanism is arranged inside the bracket, and the electromagnetic mechanism includes a coil, a coil bobbin, a moving iron core, a static iron core and a permanent magnet; the coil is arranged on the coil bobbin, the static iron core is arranged inside the coil bobbin, the moving iron core is movably arranged inside the coil bobbin, and the permanent magnet is arranged at one end of the coil bobbin close to the static iron core; a secondary amplification mechanism, the secondary amplification mechanism is slidably arranged inside the bracket, and the secondary amplification mechanism includes a push rod mechanism, a storage spring and a locking mechanism; the storage spring is arranged on the push rod mechanism, the locking mechanism is arranged at one end of the storage spring, the locking mechanism is fixed on the bracket, one end of the storage spring close to the locking mechanism is fixedly connected with the bracket, the push rod mechanism is slidably connected with the bracket, and the push rod mechanism realizes locking and separation with the locking mechanism through sliding inside the bracket; one end of the moving iron core cooperates with the static iron core, and the other end of the moving iron core passes through the coil bobbin and cooperates with the locking mechanism; an auxiliary alarm mechanism, the auxiliary alarm mechanism is arranged on one side of the bracket; the push rod mechanism includes a base and a push rod, the electromagnetic mechanism is arranged below the base, the storage spring is arranged on the base, a locking groove for cooperating with the locking mechanism is arranged on the base, an extension part is arranged at one end of the base, the extension part is perpendicular to the base, the push rod is arranged on the extension part, a slideway is arranged on the base close to the extension part, a channel is arranged through the extension part, and the channel is communicated with the slideway; the locking mechanism includes a lock, a lock elastic part and a lock shaft, the lock elastic part is sleeved on the lock shaft, the lock is arranged on the lock shaft, and both ends of the lock shaft are respectively fixed on the bracket; the lock is rotatably arranged on the lock shaft, the lock has a first lock arm and a second lock arm, the first lock arm is used for snap-connecting with the locking groove on the base, and the end face of the second lock arm is used for connecting with the moving iron core.

2. The release according to claim 1, characterized in that, the auxiliary alarm mechanism includes a substrate, a return spring, an alarm switch, an auxiliary switch, a link mechanism and a push rod; the alarm switch and the auxiliary switch are respectively arranged at both ends of the substrate, one end of the return spring is fixed on the substrate, the other end of the return spring is connected with the push rod, the push rod is slidably connected with the substrate, the push rod and the auxiliary switch are cooperatively connected through a limiting structure, the link mechanism is rotatably arranged on the substrate, one end of the link mechanism is cooperatively connected with the push rod, and the other end of the link mechanism is cooperatively connected with the alarm switch.

3. The release according to claim 2, characterized in that, a chute is arranged on the substrate, and a protrusion for cooperating with the chute is arranged on the push rod.

4. The release according to claim 1, characterized in that, the push rod is arranged on one side of the channel, and the push rod is provided with a hook part at its end.

5. The release according to claim 1, characterized in that, The latch mechanism includes a latch, a latch elastic member, and a latch shaft. The latch elastic member is sleeved on the latch shaft. The latch is disposed on the latch shaft. Two ends of the latch shaft are respectively fixed on the bracket.

6. The release according to claim 1 or 5, wherein, the electromagnetic mechanism further includes a yoke, a fixing plate, and a spring. The yoke is disposed at one end of the coil bobbin. The spring is sleeved on the moving iron core. One end of the spring is connected to the yoke, and the other end of the spring is connected to the fixing plate.

7. A circuit breaker, wherein, it includes the release according to any one of claims 1-6.

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