Release and circuit breaker

Abstract

The invention discloses a release and a circuit breaker, and particularly relates to the technical field of low-voltage electric appliances, the release comprises a shell, and an electromagnetic mechanism, a secondary amplification mechanism and an adjusting mechanism are arranged in the shell. Through the arrangement of the adjusting cavity, the first piston and other structures, when the internal temperature of the circuit breaker rises, thermal expansion gas expands to push the first piston to move in the direction of the fixed plate, larger thrust is provided for release of the movable iron core, the phenomenon that tripping is delayed or tripping cannot be conducted under the same thrust after a magnetic field is weakened is prevented, and the service life of the circuit breaker is prolonged. And when the internal temperature of the circuit breaker is too high, the attraction between the movable iron core and the static iron core can be released, so that the circuit breaker is tripped, the fault protection effect is achieved, and the safety is further improved.

Description

Technical Field

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

[0002] A trip unit is a device mechanically connected to a circuit breaker. It is used to release the holding mechanism under certain conditions, causing the circuit breaker to automatically disconnect and thus provide circuit protection.

[0003] Chinese patent application number CN202111128818.8 discloses a trip device and circuit breaker, relating to the field of low-voltage electrical equipment technology, comprising: a bracket; an electromagnetic mechanism, comprising a coil, a coil bobbin, a moving iron core, a static iron core, and a permanent magnet; the static iron core is disposed within the coil bobbin, the moving iron core is movably disposed within the coil bobbin, and the permanent magnet is disposed at one end of the coil bobbin near the static iron core; a secondary amplification mechanism, comprising a push rod mechanism, an energy storage elastic member, and a locking mechanism; the energy storage elastic member is disposed on the push rod mechanism, the locking mechanism is disposed at one end of the energy storage elastic member, the locking mechanism is fixed to the bracket, one end of the energy storage elastic member near the locking mechanism is fixedly connected to the bracket, and the push rod mechanism is slidably connected to the bracket; one end of the moving iron core engages with the static iron core, and the other end of the moving iron core extends through the coil bobbin and engages with the locking mechanism. The trip device of this invention realizes the integration of an undervoltage trip device and a shunt trip device, reducing the overall structural volume of the trip device and expanding the scope of use of the trip device.

[0004] Although the trip device of the above invention can expand its scope of use, the temperature of the coil inside the trip device will increase during use due to the external ambient temperature and the operating temperature of the electronic components inside the circuit breaker. Since the resistivity of the coil wire increases with the increase in temperature, this will cause the magnetic field strength to weaken under the same current. The weakened magnetic field strength may cause tripping delay or even failure to trip, posing a safety hazard. At the same time, the permanent magnet may demagnetize during long-term use due to factors such as temperature and external interference, causing the magnetic field strength to decay, resulting in the movable iron core being unable to normally attract the static iron core, affecting the normal use of the circuit breaker.

[0005] The present invention provides a trip unit and a circuit breaker, aiming to solve the problems of increased temperature of the internal coil of the trip unit, which causes tripping delay or even failure to trip, posing a safety hazard; and demagnetization of the permanent magnet after long-term use, which causes the moving iron core to be unable to normally attract the static iron core, affecting the normal use of the circuit breaker. Summary of the Invention

[0006] The object of the present invention is to provide a trip unit and a circuit breaker to solve the problems mentioned in the above background art, such as the increase in the temperature of the internal coil of the trip unit, which causes tripping delay or even failure to trip, posing a safety hazard, and the demagnetization of the permanent magnet after long-term use, which causes the moving iron core to be unable to normally attract the static iron core, thus affecting the normal use of the circuit breaker.

[0007] To achieve the above object, the present invention provides the following technical solution: a trip device, comprising a housing, an electromagnetic mechanism and a secondary amplification mechanism, wherein the electromagnetic mechanism comprises a coil skeleton, a moving iron core, a static iron core, a permanent magnet, a magnetic yoke, a fixing plate and a first elastic member, Also included is an adjustment mechanism, the adjustment mechanism comprising: A regulating chamber is provided with a thermal expansion gas for adjusting the release thrust of the moving iron core in response to temperature changes; a control cavity for generating a negative pressure according to the decay of the magnetic field of the permanent magnet; The storage chamber communicated with the regulating chamber and the control chamber has a piston member disposed therein, and the piston member moves to suck gas from the regulating chamber to adjust the thrust of the first elastic member.

[0008] Preferably, a first piston is slidably connected in the regulating chamber, and both ends of the first elastic member are respectively connected to the fixed plate and the first piston. After the thermal expansion gas expands, it can push the first piston to compress the first elastic member.

[0009] Preferably, a second piston is slidably connected in the control cavity, a magnetic part is fixedly embedded on the side of the second piston close to the permanent magnet, a second elastic part is connected between the second piston and the permanent magnet, and when the magnetic field of the permanent magnet decays, the second elastic part pushes the second piston to generate negative pressure.

[0010] Preferably, a driving block and a plurality of friction members are provided in the piston member. The driving block locks the piston member by squeezing the plurality of friction members through a wedge surface, and can release the lock by attracting the driving block through negative pressure.

[0011] Preferably, a connecting groove is provided at one end of the piston member, the connecting groove is connected to the control chamber, a plurality of limiting grooves are provided at equal intervals on the side wall of the piston member, a plurality of friction members are slidably connected in the corresponding limiting grooves, and the driving block is slidably connected in the connecting groove.

[0012] Preferably, a third elastic member is provided between the driving block and the communicating groove, and the negative pressure attracts the driving block by overcoming the elastic force of the third elastic member.

[0013] Preferably, the adjustment cavity is provided on a side of the magnetic yoke close to the fixed plate, and the magnetic yoke is fixedly connected to the coil frame.

[0014] Preferably, the contact area between the friction member and the inner wall of the storage chamber can increase as the gas pressure increases.

[0015] Preferably, an exhaust for air circulation is provided on a side of the control cavity away from the permanent magnet.

[0016] A circuit breaker comprises the trip unit described above.

[0017] Technical effects and advantages of the present invention: 1. The present invention, through the arrangement of the adjustment chamber and the first piston, can, when the internal temperature of the circuit breaker rises, cause the expansion of the thermally expanded gas to push the first piston toward the fixed plate, providing greater thrust for releasing the movable iron core. This prevents tripping delays or failure to trip under the same thrust after the magnetic field weakens, thereby improving safety. Furthermore, when the internal temperature of the circuit breaker is too high, the movable iron core and the stationary iron core are released from engagement, causing the circuit breaker to trip, thereby providing fault protection and further improving safety. 2. The present invention, through the arrangement of structures such as the drive block and the friction member, can generate negative pressure in the storage chamber when the permanent magnet demagnetizes and the magnetic field weakens, so that the drive block no longer squeezes the multiple friction members to contact the inner wall of the storage chamber, releases the limit on the piston member, and enables the piston member to draw a portion of the thermal expansion gas in the adjustment chamber into the storage chamber, making the thrust of the first elastic member weaker. In this way, the thrust of the first elastic member on the moving iron core can be adjusted according to the attenuation degree of the permanent magnet magnetic field, preventing the moving iron core from being unable to normally attract the static iron core under the same thrust after the strength of the permanent magnet magnetic field is attenuated, thereby avoiding affecting the normal use of the circuit breaker and thus improving the service life of the trip unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the secondary amplification mechanism of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the adjustment mechanism of the present invention.

[0021] Figure 4 It is the explosion entity of the internal structure of the piston of the present invention.

[0022] Figure 5 This is a cross-sectional view of the piston structure of the present invention.

[0023] Figure 6 It is a schematic structural diagram of the push rod mechanism of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the locking mechanism of the present invention.

[0025] Figure 8 Schematic diagram of the position of the limit rod of the present invention.

[0026] Figure 9 It is a schematic diagram of the electromagnetic mechanism structure of the present invention.

[0027] The accompanying drawings are marked as follows: 1. housing; 2. electromagnetic mechanism; 21. coil; 22. coil skeleton; 23. moving iron core; 24. static iron core; 25. permanent magnet; 26. magnetic yoke; 27. fixing plate; 28. first elastic member; 29. ​​mounting bracket; 3. secondary amplification mechanism; 31. push rod mechanism; 311. base; 312. push rod; 313. locking groove; 314. extension portion; 315. slideway; 316. channel; 317. hook portion; 318. side plate; 319. connecting rod; 32. energy storage elastic member; 33. Locking mechanism; 331. Lock; 332. Locking elastic member; 333. Locking shaft; 334. First locking arm; 335. Second locking arm; 336. Limiting rod; 337. Support member; 4. Adjusting mechanism; 41. Adjusting chamber; 42. First piston; 43. Control chamber; 44. Second piston; 45. Magnetic member; 46. Second elastic member; 47. Storage chamber; 48. Piston member; 49. Connecting groove; 410. Limiting groove; 411. Friction member; 412. Drive block; 413. Third elastic member. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] Example 1 refer to Figures 1 to 9 A trip device according to an embodiment of the present invention includes a housing 1, wherein an electromagnetic mechanism 2, a secondary amplification mechanism 3, and an adjustment mechanism 4 are provided inside the housing 1; The electromagnetic mechanism 2 includes a coil 21, a coil frame 22, a moving iron core 23, a static iron core 24, a permanent magnet 25, a yoke 26, a fixed plate 27 and a first elastic member 28. The coil 21 is installed on the coil frame 22, the static iron core 24 is installed in the coil frame 22, the moving iron core 23 is slidably connected in the coil frame 22, the permanent magnet 25 is arranged at one end of the coil frame 22 close to the static iron core 24, the yoke 26 is arranged at the other end of the coil frame 22, the fixed plate 27 is fixedly connected to the moving iron core 23, the first elastic member 28 is sleeved on the moving iron core 23 and is located between the yoke 26 and the fixed plate 27, and the two ends of the coil frame 22 are fixedly connected to the mounting bracket 29, and each mounting bracket 29 is fixedly connected to the shell 1. The electromagnetic mechanism 2 is a prior art and will not be described in detail here.

[0030] refer to Figure 2 、 Figures 6 to 9 The secondary amplification mechanism 3 is slidably connected in the housing 1 and includes a push rod mechanism 31, an energy storage elastic member 32 and a lock mechanism 33. The push rod mechanism 31 includes a base 311 and a push rod 312. The base 311 is slidably connected to the housing 1 through a slider arranged on the side. The electromagnetic mechanism 2 is arranged below the base 311. The energy storage elastic member 32 is arranged on the base 311. A lock groove 313 is provided on the base 311 to cooperate with the lock mechanism 33. An extension portion 314 is provided at one end of the base 311, and the extension portion 314 is arranged perpendicular to the base 311. The push rod 312 is provided on the extension portion 314. A slideway 315 is provided on the side of the base 311 close to the extension portion 314. A channel 316 is provided on the extension portion 314, and the channel 316 is communicated with the slideway 315. A side plate 318 is provided on the end of the base 311 away from the extension portion 314. 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. The push rod 312 is provided on one side of the channel 316, and a hook portion 317 is provided on the end of the push rod 312. The circuit breaker is provided with a handle and a lever (not shown in the figure). The handle is used to realize the connection and disconnection of the circuit breaker. The operating handle can drive the lever to move. The lever can cooperate with the push rod mechanism 31 through the lever shaft. The structural principle of the circuit breaker is existing technology and will not be described in detail here.

[0031] Figures 6 to 9 When the latch is in the unlocked position, the latch can be locked to the unlocked position when the latch is in the unlocked position, and the lock hole 333 of the first latch 331 can be locked to the unlocked position when the latch is in the unlocked position.

[0032] The specific working principle is that in the initial state, the push rod mechanism 31 pushes the moving iron core 23 in the coil skeleton 22 toward the static iron core 24 under the action of the energy storage elastic member 32, and the moving iron core 23 and the static iron core 24 are attracted to each other under the action of the permanent magnet 25; When the handle is pushed to buckle the circuit breaker, the lever shaft provided on the circuit breaker drives the base 311 to move in the housing 1 and compresses the energy storage elastic member 32. When the base 311 drives the connecting rod 319 to move to the position of the limiting rod 336, the second locking arm 335 drives the limiting rod 336 to be clamped into the locking groove 313 under the action of the locking elastic member 332, thereby limiting the push rod mechanism 31 and preventing the push rod mechanism 31 from moving away from the locking mechanism 33 under the action of the energy storage elastic member 32. At this time, the energy storage elastic member 32 is in the energy storage state, and the moving iron core 23 and the static iron core 24 are still in the attracted state under the action of the permanent magnet 25. When tripping is required, the coil 21 is energized. After being energized, the coil 21 will generate a magnetic field opposite to the permanent magnet 25, thereby overcoming the attraction of the permanent magnet 25 on the moving iron core 23, causing the moving iron core 23 to be released. After being released, the moving iron core 23 will impact the second locking arm 335 of the lock buckle 331 under the thrust of the first elastic member 28, causing the lock buckle 331 to drive the first locking arm 334 to deflect, and causing the limiting rod 336 to separate from the lock buckle groove 313, thereby releasing the limit on the push rod mechanism 31, causing the push rod mechanism 31 to be released under the action of the energy storage elastic member 32, and quickly slide to the initial position. In the process of returning to the initial position, the tripping rod on the circuit breaker is deflected through the hook portion 317, thereby tripping the circuit breaker. In the process of returning to the initial position, the push rod mechanism 31 will drive the moving iron core 23 to be attracted to the static iron core 24 again, completing the action cycle.

[0033] Example 2 During use, the temperature of the coil 21 inside the trip unit rises due to the external ambient temperature and the operating temperature of the electronic components inside the circuit breaker. Since the resistivity of the wire of the coil 21 increases with the increase in temperature, this will cause the magnetic field strength to weaken under the same current. The weakened magnetic field strength may cause tripping delay or even failure to trip, posing a safety hazard. Therefore, this embodiment improves the device described in the above embodiment.

[0034] refer to Figure 2 and Figure 3 The adjusting mechanism 4 includes an adjusting chamber 41, which is arranged on the side of the magnetic yoke 26 close to the fixed plate 27. The first piston 42 is slidably connected in the adjusting chamber 41. One end of the first elastic member 28 is connected to the first piston 42, and the other end is connected to the fixed plate 27. Thermal expansion gas is arranged inside the adjusting chamber 41 on the side of the first piston 42 away from the fixed plate 27.

[0035] During actual use, when the temperature inside the circuit breaker rises, the thermal expansion gas in the regulating chamber 41 will expand due to the heat. The thermal expansion gas will push the first piston 42 toward the fixed plate 27, thereby further compressing the first elastic member 28. This can increase the thrust when the moving iron core 23 is released, thereby providing greater thrust when the magnetic field is weakened. The higher the temperature, the greater the resistivity of the coil 21 conductor, and the greater the expansion volume of the thermally expanded gas. This can adapt to temperature changes and increase the thrust of the moving iron core 23 when it is released, compensate for the weakening of the magnetic field caused by temperature, and prevent tripping delays or failure to trip under the same thrust after the magnetic field of the coil 21 is weakened, thereby improving safety.

[0036] It should be noted that when the internal temperature of the circuit breaker is too high due to a fault, the thermal expansion gas can expand violently and cooperate with the first elastic member 28, so that the moving iron core 23 can overcome the magnetic force of the permanent magnet 25, and can release the attraction between the moving iron core 23 and the static iron core 24, causing the circuit breaker to trip, thereby playing a role in fault protection and further improving safety.

[0037] To sum up, by setting up structures such as the adjusting chamber 41 and the first piston 42, when the internal temperature of the circuit breaker rises, the expansion of the thermal expansion gas can push the first piston 42 toward the fixed plate 27, providing a greater thrust for the release of the moving iron core 23, preventing the occurrence of tripping delay or failure to trip under the same thrust after the magnetic field is weakened, thereby improving safety. When the internal temperature of the circuit breaker is too high, the attraction between the moving iron core 23 and the static iron core 24 can be released, causing the circuit breaker to trip, thereby playing a role in fault protection and further improving safety.

[0038] Example 3 During use, the permanent magnet 25 may demagnetize due to factors such as temperature and external interference during long-term use, causing the magnetic field strength to decay, resulting in the moving iron core 23 being unable to normally attract the static iron core 24, affecting the normal use of the circuit breaker. Therefore, this embodiment improves the device described in the above embodiment.

[0039] refer to Figures 2 to 5 The regulating mechanism 4 further includes a control chamber 43 and a storage chamber 47. The permanent magnet 25 is fixedly connected in the control chamber 43. A second piston 44 is slidably connected in the control chamber 43. A magnetic member 45 is fixedly embedded on the side of the second piston 44 close to the permanent magnet 25. A second elastic member 46 is connected between the second piston 44 and the permanent magnet 25. An exhaust hole for air circulation is opened on the side of the control chamber 43 away from the permanent magnet 25. refer to Figures 3 to 5The two ends of the storage chamber 47 are respectively connected to the regulating chamber 41 and the control chamber 43. A piston member 48 is slidably connected in the storage chamber 47. A communicating groove 49 is provided on the side of the piston member 48 close to the control chamber 43. A plurality of limiting grooves 410 connected to the communicating groove 49 are evenly provided on the outside of the piston member 48. A friction member 411 is slidably connected in each limiting groove 410. A driving block 412 is slidably connected in the communicating groove 49. Wedge-shaped surfaces that can cooperate with each other are provided between one end of the plurality of friction members 411 located inside the communicating groove 49 and the driving block 412. A third elastic member 413 is sleeved inside the communicating groove 49. One end of the third elastic member 413 is connected to the driving block 412, and the other end is connected to the communicating groove 49. The elastic coefficient of the second piston 44 is greater than that of the third elastic member 413.

[0040] During actual use, in the initial state, the driving block 412 will squeeze the multiple friction members 411 under the thrust of the third elastic member 413, so that the friction heads of the multiple friction members 411 can contact the inner wall of the storage chamber 47 and limit the piston member 48 to prevent the piston member 48 from moving in the storage chamber 47; When the permanent magnet 25 demagnetizes and the magnetic field weakens, the attraction of the permanent magnet 25 on the magnetic member 45 weakens. At this time, the second elastic member 46 can push the second piston 44 to move in the direction away from the permanent magnet 25. During the movement of the second piston 44, the air in the storage chamber 47 is pumped into the control chamber 43, thereby generating a negative pressure in the storage chamber 47. The negative pressure in the storage chamber 47 drives the driving block 412 to compress the third elastic member 413, so that the driving block 412 no longer squeezes the multiple friction members 411 to contact the inner wall of the storage chamber 47, releases the limit on the piston member 48, and allows the piston member 48 to move in the storage chamber 47. At this time, the negative pressure in the storage chamber 47 can drive the piston member 48 to move toward the control chamber 43 and pump a part of the thermal expansion gas in the regulating chamber 41 into the storage chamber 47, so that the first piston 42 can further move in the regulating chamber 41 in the direction away from the fixed plate 27, thereby weakening the thrust of the first elastic member 28. The weaker the magnetic field of the permanent magnet 25, the stronger the negative pressure in the storage chamber 47, the farther the piston member 48 moves, and the more thermal expansion gas is pumped out of the adjustment chamber 41, making the thrust of the first elastic member 28 on the moving iron core 23 weaker. Therefore, the thrust of the first elastic member 28 on the moving iron core 23 can be adjusted according to the attenuation degree of the magnetic field of the permanent magnet 25, to prevent the moving iron core 23 from being unable to normally attract with the static iron core 24 under the same thrust after the magnetic field strength of the permanent magnet 25 is attenuated, thereby avoiding affecting the normal use of the circuit breaker and thus improving the service life of the trip unit.

[0041] It should be noted that since the regulating chamber 41 is connected to the storage chamber 47, the thermal expansion gas will generate thrust on the piston member 48 after thermal expansion. If no negative pressure is generated on the other side of the piston member 48, the driving block 412 will squeeze the multiple friction members 411 under the simultaneous action of the third elastic member 413 and the positive pressure, so that the friction heads of the multiple friction members 411 can further contact the inner wall of the storage chamber 47, thereby improving the limiting of the piston member 48 and preventing the piston member 48 from moving in the storage chamber 47. In this way, the friction member 411 will release the limiting of the piston member 48 only when the permanent magnet 25 is demagnetized and negative pressure is generated in the storage chamber 47, thereby preventing the thermal expansion gas from pushing the piston member 48 to move when the permanent magnet 25 is not demagnetized.

[0042] To sum up, by setting structures such as the drive block 412 and the friction member 411, when the permanent magnet 25 demagnetizes and the magnetic field weakens, a negative pressure can be generated in the storage chamber 47, so that the drive block 412 no longer squeezes the multiple friction members 411 to contact the inner wall of the storage chamber 47, and the limit on the piston member 48 is released, so that the piston member 48 can draw a part of the thermal expansion gas in the adjustment chamber 41 into the storage chamber 47, so that the thrust of the first elastic member 28 is weaker, so that the thrust of the first elastic member 28 on the moving iron core 23 can be adjusted according to the attenuation degree of the magnetic field of the permanent magnet 25, to prevent the moving iron core 23 from being unable to normally attract with the static iron core 24 under the same thrust after the magnetic field strength of the permanent magnet 25 is attenuated, thereby avoiding affecting the normal use of the circuit breaker and thus improving the service life of the trip unit.

[0043] Example 4 This embodiment provides a circuit breaker including the above-mentioned trip unit. On the one hand, the release force of the iron core 23 can be adjusted according to temperature changes to prevent the circuit breaker from experiencing tripping delays or failure to trip. On the other hand, the release force of the iron core 23 can be adjusted according to changes in the magnetic field of the permanent magnet 25 to avoid affecting the normal use of the circuit breaker and improve the safety of the circuit breaker.

[0044] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A trip device comprising a housing (1), an electromagnetic mechanism (2) and a secondary amplification mechanism (3), wherein the electromagnetic mechanism (2) comprises a coil skeleton (22), a moving iron core (23), a static iron core (24), a permanent magnet (25), a magnetic yoke (26), a fixing plate (27) and a first elastic member (28), characterized in that: It also includes an adjustment mechanism (4), which includes: A regulating chamber (41) for heat-expanding gas is provided, for adjusting the thrust released by the moving iron core (23) in response to temperature changes; A control cavity (43) for generating a negative pressure according to the attenuation of the magnetic field of the permanent magnet (25); A storage chamber (47) communicated with the regulating chamber (41) and the control chamber (43) has a piston member (48) disposed therein, and the piston member (48) moves to draw gas from the regulating chamber (41) to adjust the thrust of the first elastic member (28).

2. The trip unit according to claim 1, wherein: A first piston (42) is slidably connected in the regulating chamber (41), and two ends of the first elastic member (28) are respectively connected to the fixed plate (27) and the first piston (42). After the thermal expansion gas expands, it can push the first piston (42) to compress the first elastic member (28).

3. The release according to claim 2, characterized in that: A second piston (44) is slidably connected in the control chamber (43), a magnetic member (45) is fixedly embedded on a side of the second piston (44) close to the permanent magnet (25), and a second elastic member (46) is connected between the second piston (44) and the permanent magnet (25). When the magnetic field of the permanent magnet (25) decays, the second elastic member (46) pushes the second piston (44) to generate negative pressure.

4. The release according to claim 3, characterized in that: A driving block (412) and a plurality of friction members (411) are provided in the piston member (48). The driving block (412) locks the piston member (48) by squeezing the plurality of friction members (411) through a wedge surface, and can release the lock by attracting the driving block (412) through negative pressure.

5. The trip unit according to claim 4, characterized in that: A connecting groove (49) is provided at one end of the piston member (48), and the connecting groove (49) is connected to the control chamber (43). A plurality of limiting grooves (410) are provided at equal intervals on the side wall of the piston member (48). A plurality of friction members (411) are slidably connected in the corresponding limiting grooves (410), and the driving block (412) is slidably connected in the connecting groove (49).

6. The release according to claim 5, characterized in that: A third elastic member (413) is provided between the driving block (412) and the communicating groove (49), and the negative pressure attracts the driving block (412) by overcoming the elastic force of the third elastic member (413).

7. The trip unit according to claim 6, characterized in that: The regulating cavity (41) is provided on a side of the magnetic yoke (26) close to the fixed plate (27), and the magnetic yoke (26) is fixedly connected to the coil frame (22).

8. The trip unit according to claim 7, characterized in that: The contact area between the friction member (411) and the inner wall of the storage chamber (47) can increase as the gas pressure increases.

9. The release according to claim 8, characterized in that: An exhaust for air circulation is provided on a side of the control chamber (43) away from the permanent magnet (25).

10. A circuit breaker, characterized in that: The device comprises a trip unit according to any one of claims 1 to 9.

Images