Tripping device and circuit breaker

Abstract

The utility model discloses a tripping device and a circuit breaker, and relates to the low-voltage electrical technical field. The tripping device comprises a push rod, and a thermal tripping piece and an electromagnetic tripping assembly which are respectively in driving fit with the push rod. The electromagnetic tripping component and the thermal tripping component are respectively positioned on two opposite sides of the push rod; the electromagnetic tripping assembly comprises an iron core assembly and an ejector rod penetrating through the iron core assembly, the iron core assembly can drive the ejector rod to move towards one end of the push rod, and the ejector rod can drive the push rod to move towards the tripping direction; the thermal tripping piece comprises a bimetallic strip, and the bimetallic strip is heated to deform so as to push the push rod to move towards the tripping direction; and the push rod moves towards the tripping direction to unlock the lock catch and the jump pin. According to the tripping device, thermal tripping and electromagnetic tripping can be achieved in an integrated mode, the structure of the tripping device is simpler through the mode that tripping is achieved from the two sides of the push rod respectively, the assembling gap between the tripping device and the contact torsion spring is enlarged, dielectric breakdown is avoided, miniaturization of the circuit breaker is facilitated, and the reliability of the circuit breaker is improved. And the use safety and reliability of the circuit breaker are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical technology field, specifically, relate to a tripping device and circuit breaker. BACKGROUND

[0002] The circuit breaker refers to the mechanical switch appliance that can be connected, carried and disconnected under the current of normal circuit condition, and can be connected, carried for a certain time and disconnected under the current of stipulated abnormal circuit condition.

[0003] The thermal magnetic tripping device is a common important component for the circuit breaker, can provide safe and reliable circuit protection for the electrical system through overload protection and short circuit protection function, prevents the damage of electrical equipment due to overcurrent and short circuit fault, and guarantees the stable operation of the power system.

[0004] The existing thermal magnetic tripping device's traction rod plays the role of transmission and conversion of tripping signal, when the overload current appears in the circuit, the traction rod is displaced or rotated after being pushed by the bimetallic strip, and acts on the lock catch of the circuit breaker to break the original locking state of the circuit breaker, so that the contacts of the circuit breaker are separated, thereby cutting off the circuit and realizing the overload protection of the circuit. However, since the existing traction rod is composed of multiple components to be respectively contacted and matched with the electromagnetic tripping assembly, the thermal tripping part and the lock catch, the structure is relatively complex, the assembly gap with the contact torsional spring is small, the dielectric breakdown problem is prone to occur, and the use safety of the circuit breaker is reduced. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a tripping device and circuit breaker, which can increase the assembly gap with the contact torsional spring through the simplification of the structure of the push rod, avoid the dielectric breakdown problem, and improve the use safety of the circuit breaker.

[0006] The embodiment of the utility model is realized as follows:

[0007] One aspect of the utility model provides a tripping device, which comprises a push rod and a thermal tripping part and an electromagnetic tripping assembly respectively driven in cooperation with the push rod, the electromagnetic tripping assembly and the thermal tripping part are respectively located on the opposite sides of the push rod, the electromagnetic tripping assembly comprises an iron core assembly and a top rod penetrating the iron core assembly, the iron core assembly can drive the top rod to move towards one end of the push rod, and the top rod can drive the push rod to move towards the tripping direction, the thermal tripping part comprises a bimetallic strip, the bimetallic strip is deformed by heat to push the push rod to move towards the tripping direction, and the movement of the push rod towards the tripping direction unlocks the lock catch and the trip catch.

[0008] Optionally, the push rod comprises a body, one side of the body is provided with a groove, an end of the lock catch is capable of being accommodated in the groove; one side of the groove is provided with a boss, the end of the lock catch is provided with an abutting portion; the body is driven to move in the tripping direction to make the boss abut against the abutting portion of the lock catch and drive the lock catch to rotate in the direction of unlocking the trip catch.

[0009] Optionally, one end of the body is provided with a magnetic tripping trigger portion, an end surface of the magnetic tripping trigger portion is oppositely arranged with an end surface of a top rod of the electromagnetic tripping assembly and has a preset interval, the top rod is driven to move towards the body to abut against the magnetic tripping trigger portion and drive the body to move in the tripping direction.

[0010] Optionally, one side of the body away from the magnetic tripping end is further provided with a thermal tripping trigger portion, the thermal tripping trigger portion comprises a trigger rod which is arranged perpendicularly to the body, a side wall of the trigger rod is oppositely arranged with a bimetallic strip and has a preset interval, the bimetallic strip is driven to abut against the trigger rod and drive the body to move in the tripping direction through the trigger rod.

[0011] Optionally, the body further comprises a first limiting portion between the magnetic tripping trigger portion and the thermal tripping trigger portion; the body is arranged in the mounting shell plate of the circuit breaker and is slidably connected with the first sliding groove of the mounting shell plate through the first limiting portion.

[0012] Optionally, the body further comprises a second limiting portion arranged on the side away from the magnetic tripping end, the second limiting portion is mutually away from the trigger rod; the body is arranged in the mounting shell plate of the circuit breaker and is slidably connected with the second sliding groove of the mounting shell plate through the second limiting portion.

[0013] Optionally, the tripping device further comprises a reset assembly, the reset assembly comprises a torsional spring and a positioning column, the positioning column is fixedly arranged in the mounting shell plate of the circuit breaker, the torsional spring is sleeved on the outer wall of the positioning column and the end portion is connected with the body, when the body moves in the tripping direction, the torsional spring is compressed to store energy to provide a reset force for the body.

[0014] In another aspect of the utility model, a kind of circuit breaker is provided, including shell, lock catch, mounting shell plate and above-mentioned tripping device, mounting shell plate is fixedly arranged in shell, tripping device is clamped in mounting shell plate, and tripping device includes the push rod that can be cooperated with the drive of lock catch;Mounting shell plate has the first sliding groove being arranged along the tripping direction of the push rod of tripping device;Push rod includes body, and body has first limiting portion;Body is arranged in the first sliding groove by first limiting portion.

[0015] Optionally, the body has a thermal tripping trigger portion, the thermal tripping trigger portion comprises a trigger rod arranged perpendicularly to the body; the body further comprises a second limiting portion mutually away from the trigger rod; the mounting shell plate has a second sliding groove arranged along the tripping direction of the push rod of the tripping device, and the body is arranged in the second sliding groove through the second limiting portion.

[0016] Optionally, the mounting shell plate comprises a first shell plate and a second shell plate connected together, the first shell plate is provided with a first abutting end near the outer wall of one side of the thermal trip triggering portion of the body, the second shell plate is provided with a second abutting end near the outer wall of one side of the thermal trip triggering portion of the body, the first abutting end and the second abutting end have a preset interval, and the opposite sides of the thermal trip triggering portion can abut against the first abutting end and the second abutting end respectively when the body moves along the first sliding groove and the second sliding groove.

[0017] The beneficial effects of the utility model include at least one of the following:

[0018] The application provides a tripping device, which comprises a push rod and a thermal tripping part and an electromagnetic tripping assembly which are respectively driven by the push rod; the electromagnetic tripping assembly and the thermal tripping part are respectively located on opposite sides of the push rod; the electromagnetic tripping assembly comprises an iron core assembly and a top rod which is arranged in the iron core assembly, the iron core assembly can drive the top rod to move towards one end of the push rod, and the top rod can drive the push rod to move towards a tripping direction; the thermal tripping part comprises a bimetallic strip, the bimetallic strip deforms under heat to push the push rod to move towards the tripping direction; the movement of the push rod towards the tripping direction unlocks the lock catch and the trip catch. The tripping device can realize thermal tripping and electromagnetic tripping in an integrated manner, and the tripping device has a more compact structure, a larger assembly gap with a contact torsional spring and improved dielectric breakdown resistance, which is conducive to the miniaturization of the circuit breaker and improves the use safety and reliability of the circuit breaker.

[0019] The application further provides a circuit breaker, which comprises a shell, a mounting shell plate and the tripping device, the mounting shell plate is fixedly arranged in the shell, and the tripping device is clamped in the mounting shell plate; the mounting shell plate is provided with a first sliding groove which is arranged along the tripping direction of the push rod of the tripping device; the push rod comprises a body, and the body is provided with a first limiting portion; and the body is arranged in the first sliding groove through the first limiting portion. The arrangement of the mounting shell plate simplifies the assembly process of the tripping device and makes the positions of the body, the thermal tripping part and the electromagnetic tripping assembly independent of each other. The arrangement of the circuit breaker realizes miniaturization and improves the reliability and safety of the tripping process of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 The structure diagram of the tripping device provided in the embodiments of the utility model is shown in the figure.

[0022] Figure 2 Structure diagram of the push rod of the tripping device provided by the embodiment of the utility model;

[0023] Figure 3 Structure diagram of the push rod of the tripping device provided by the embodiment of the utility model;

[0024] Figure 4 Structure diagram of the circuit breaker provided by the embodiment of the utility model;

[0025] Figure 5 Assembly diagram of the mounting shell plate of the circuit breaker and the tripping device provided by the embodiment of the utility model;

[0026] Figure 6 Detail enlarged view of A;

[0027] Figure 7 Structure diagram of the mounting shell plate of the circuit breaker provided by the embodiment of the utility model.

[0028] Icon: 100 - tripping device; 110 - push rod; 111 - body; 111A - groove; 111B - boss; 112 - magnetic tripping trigger part; 113 - thermal tripping trigger part; 113A - trigger rod; 114 - first limiting part; 115 - second limiting part; 120 - thermal tripping part; 121 - bimetallic strip; 130 - electromagnetic tripping assembly; 131 - iron core assembly; 132 - top rod; 140 - reset assembly; 141 - torsional spring; 142 - positioning column; 200 - circuit breaker; 210 - shell; 220 - mounting shell plate; 221 - first shell plate; 221A - first abutting end; 222 - second shell plate; 222A - second abutting end; 223 - first sliding groove; 224 - second sliding groove; 230 - lock catch; 231 - abutting part. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0031] It should be noted that like reference numerals and letters refer to like items in the several views, and that no further definitions and explanations of a certain item are required in the subsequent drawings once it has been defined in one drawing.

[0032] In the description of the utility model, it needs to be explained that the directions or position relations indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or position relations shown in the drawings, or the directions or position relations in which the utility model product is usually placed during use, and are merely for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as indicating or implying that the indicated devices or elements must have a specific direction, be constructed and operated in a specific direction, and thus cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are merely used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" merely means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "setting", "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication between two elements inside. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0035] Please refer to Figure 1 The embodiment provides a tripping device 100, which comprises a push rod 110, a thermal tripping part 120 and an electromagnetic tripping assembly 130 which are respectively driven in cooperation with the push rod 110; the electromagnetic tripping assembly 130 and the thermal tripping part 120 are respectively located on opposite sides of the push rod 110; the electromagnetic tripping assembly 130 comprises a core assembly 131 and a top rod 132 which is arranged in the core assembly 131, the core assembly 131 can drive the top rod 132 to move towards one end of the push rod 110, and the top rod 132 can drive the push rod 110 to move towards a tripping direction; the thermal tripping part 120 comprises a bimetallic strip 121, the bimetallic strip 121 is deformed by heat to push the push rod 110 to move towards the tripping direction; the movement of the push rod 110 towards the tripping direction makes a lock catch 230 and a trip catch unlocked.

[0036] Specifically, the application provides a tripping device 100, which comprisesFigure 1 As shown, it comprises a push rod 110, a thermal trip 120 and an electromagnetic trip assembly 130. Among them, the push rod 110 is in a sheet structure, and the thermal trip 120 and the electromagnetic trip assembly 130 are respectively arranged on opposite sides of the push rod 110. Preferably, the push rod 110 is made of plastic material. Since the plastic material has a very high volume resistivity and surface resistivity, the push rod 110 made of plastic material can effectively prevent the flow of current in its interior and surface, avoiding dielectric breakdown. Compared with the metal traction rod used in the existing trip device 100, the way of realizing tripping by acting on the push rod 110 from both sides not only makes the structure of the trip device 100 more simple, increases the assembly gap with the contact torsional spring, avoids dielectric breakdown, and improves the safety and reliability of use.

[0037] As shown in Figure 1 , the electromagnetic trip assembly 130 comprises a core assembly 131 and a top rod 132 penetrating the middle of the core assembly 131. The core assembly 131 comprises a core, a coil wound on the outer wall of the core, and an armature located on one side of the core. When a short circuit or other fault occurs in the circuit, causing the current to instantaneously increase and pass through the coil, a strong magnetic field will be generated around the coil. At this time, the armature moves towards the core, driving the top rod 132 to extend out of the core assembly 131 and move towards the push rod 110, so that the top rod 132 abuts against one side of the push rod 110 and the push rod 110 moves in the tripping direction; the movement of the push rod 110 in the tripping direction can unlock the lock catch 230 and the trip catch. At this time, the moving contact and the stationary contact of the circuit breaker 200 rapidly separate, thereby cutting off the circuit and achieving protection of the circuit.

[0038] As shown in Figure 1 , the thermal trip 120 comprises a bimetallic strip 121. When the current passes through the thermal trip of the circuit breaker 200, the bimetallic strip 121 will heat up due to the current passing through it. As the temperature continues to rise, the degree of bending of the bimetallic strip 121 continues to increase. When it bends to a certain extent, the bimetallic strip 121 deforms due to heat to touch and push the push rod 110, causing the push rod 110 to move in the tripping direction; the movement of the push rod 110 in the tripping direction can unlock the lock catch 230 and the trip catch. At this time, the moving contact and the stationary contact of the circuit breaker 200 rapidly separate, thereby cutting off the circuit and achieving overload protection of the circuit.

[0039] It should be noted that in one embodiment of the present application, first, please refer to Figure 1 , Figure 2 and Figure 3The push rod 110 comprises a body 111, one side of the body 111 is provided with a groove 111A, an end of the lock catch 230 can be accommodated in the groove 111A; one side of the groove 111A is provided with a boss 111B, the end of the lock catch 230 has an abutting portion 231; the body 111 is driven to move in the tripping direction to make the boss 111B abut against the abutting portion 231 of the lock catch 230, and drive the lock catch 230 to rotate in a direction of unlocking the jumper.

[0040] Specifically, as shown in Figure 2 , the push rod 110 comprises a body 111 and a magnetic tripping portion 112 and a thermal tripping portion 113 respectively arranged on opposite sides of the body 111. The electromagnetic tripping assembly 130 can abut against the magnetic tripping portion 112 to drive the body 111 to move in the tripping direction; the thermal tripping member 120 can abut against the thermal tripping portion 113 to drive the body 111 to move in the tripping direction.

[0041] In order to ensure that the body 111 can quickly and reliably drive the lock catch 230 to unlock the jumper when moving in the tripping direction, as shown in Figure 2 and Figure 3 , one side of the body 111 is provided with a groove 111A, an end of the lock catch 230 can be accommodated in the groove 111A; when the body 111 moves in the tripping direction, the side wall of the groove 111A can abut against the end of the lock catch 230. In order to further ensure the reliability of the abutment between the end of the lock catch 230 and the side wall of the groove 111A, the side wall of the groove 111A is provided with a boss 111B, and correspondingly, as shown in Figure 1 , the end of the lock catch 230 has an abutting portion 231. When the body 111 is driven to move in the tripping direction, the boss 111B can move relative to the abutting portion 231 of the lock catch 230 until the boss 111B abuts against the abutting portion 231 and pushes the lock catch 230 to rotate in a direction of unlocking the jumper, so as to achieve the unlocking of the lock catch 230 and the jumper.

[0042] Second, one end of the body 111 has a magnetic tripping portion 112, an end face of the magnetic tripping portion 112 is arranged opposite to an end face of a top rod 132 of the electromagnetic tripping assembly 130 with a preset interval, the top rod 132 is driven to move towards the body 111 to abut against the magnetic tripping portion 112 and push the body 111 to move in the tripping direction.

[0043] Specifically, as shown in Figure 2 and Figure 3The one end of the body 111 has a magnetic tripping portion 112, which is arranged obliquely relative to the body 111 to be opposite to the end surface of the top rod 132 of the electromagnetic tripping assembly 130. The end surface of the magnetic tripping portion 112 has a preset interval with the end surface of the top rod 132 of the electromagnetic tripping assembly 130. The iron core assembly 131 drives the top rod 132 to move towards the push rod 110 by a preset interval, until the end surface of the top rod 132 abuts against the end surface of the magnetic tripping portion 112.

[0044] Thirdly, as Figure 2 and Figure 3 The side of the body 111 away from the magnetic tripping end also has a thermal tripping portion 113, which includes a tripping rod 113A arranged perpendicularly to the body 111. The side wall of the tripping rod 113A is arranged opposite to the bimetallic strip 121 with a preset interval. The bimetallic strip 121 is driven to abut against the tripping rod 113A, and pushes the body 111 to move in the tripping direction through the tripping rod 113A.

[0045] Specifically, the side of the body 111 away from the magnetic tripping end also has a thermal tripping portion 113, which can abut against the bimetallic strip 121 of the thermal tripping member 120. In order to facilitate the bimetallic strip 121 to contact the thermal tripping portion 113, the thermal tripping portion 113 includes a tripping rod 113A arranged perpendicularly to the body 111. The tripping rod 113A is arranged opposite to the bimetallic strip 121 with a preset interval. The bimetallic strip 121 is deformed by heat to abut against the tripping rod 113A, and pushes the body 111 to move in the tripping direction through the tripping rod 113A.

[0046] Through the arrangement of the magnetic tripping end and the thermal tripping portion 113, the positions of the thermal tripping member 120 and the electromagnetic tripping assembly 130 are independent of each other, which improves the reliability and safety of the tripping process.

[0047] The application provides a tripping device 100, which comprises a push rod 110, a thermal tripping part 120 and an electromagnetic tripping assembly 130 which are respectively in driving cooperation with the push rod 110; the electromagnetic tripping assembly 130 and the thermal tripping part 120 are respectively located on opposite sides of the push rod 110; the electromagnetic tripping assembly 130 comprises a core assembly 131 and a top rod 132 which is arranged through the core assembly 131, the core assembly 131 can drive the top rod 132 to move towards one end of the push rod 110, and the top rod 132 can drive the push rod 110 to move towards a tripping direction; the thermal tripping part 120 comprises a bimetallic strip 121 which is deformed by heat to push the push rod 110 to move towards the tripping direction; the movement of the push rod 110 towards the tripping direction makes a lock catch 230 and a trip catch be unlocked. The tripping device 100 can realize thermal tripping and electromagnetic tripping in an integrated mode, the tripping device 100 is more compact in structure by realizing tripping from two sides of the push rod 110, the assembly gap with a contact torsional spring is increased, dielectric breakdown is avoided, and the miniaturization of a circuit breaker 200 is facilitated, and the use safety and reliability of the circuit breaker 200 are improved.

[0048] In an implementation of the application, please refer to Figure 2 , Figure 3 , Figure 5 and Figure 7 The body 111 further comprises a first limiting part 114 which is located between the magnetic tripping trigger part 112 and the thermal tripping trigger part 113; the body 111 is arranged in the mounting shell plate 220 of the circuit breaker 200 and is in sliding connection with the first sliding groove 223 of the mounting shell plate 220 through the first limiting part 114, so as to improve the connection stability of the body 111 and the mounting shell plate 220.

[0049] In an implementation of the application, please refer to Figure 3 , Figure 5 and Figure 7 The body 111 further comprises a second limiting part 115 which is arranged on a side away from the magnetic tripping trigger end and is mutually away from the trigger rod 113A; the body 111 is arranged in the mounting shell plate 220 of the circuit breaker 200 and is in sliding connection with the second sliding groove 224 of the mounting shell plate 220 through the second limiting part 115.

[0050] Specifically, in order to further limit the body 111, so as to avoid the body 111 from shaking up and down during the movement in the tripping direction, as Figure 3As shown, the body 111 further comprises a second limiting part 115, which is arranged on one side of the magnetic tripping end and is arranged away from the trigger rod 113A. The body 111 is clamped in the second sliding groove 224 of the mounting shell plate 220 through the second limiting part 115, so as to further improve the connection stability between the body 111 and the mounting shell plate 220. Preferably, in order to improve the limiting effect, the number of the second limiting part 115 can be multiple, and the multiple second limiting parts 115 are arranged side by side and at intervals.

[0051] For example, referring to Figure 5 and Figure 6 , the tripping device 100 further comprises a reset assembly 140, which comprises a torsional spring 141 and a positioning column 142. The positioning column 142 is fixedly arranged in the mounting shell plate 220 of the circuit breaker 200, and the torsional spring 141 is sleeved on the outer wall of the positioning column 142 and connected with the body 111 at the end. When the body 111 moves in the tripping direction, the torsional spring 141 is compressed to store energy, so as to provide a reset force for the body 111.

[0052] Specifically, as shown in Figure 6 , the positioning column 142 is fixedly arranged in the mounting shell plate 220, so as to avoid the arrangement of the positioning rod interfering with the tripping movement of the push rod 110. The torsional spring 141 is sleeved on the outer wall of the positioning column 142 and is arranged on the body 111 at the end. When the body 111 moves in the tripping direction, the torsional spring 141 can be compressed to store energy, so as to provide a reset force for the body 111. When the torsional spring 141 releases energy, the body 111 can be reset.

[0053] Another aspect of the utility model, as Figure 4 shown, a circuit breaker 200 is provided, which comprises a shell 210, a lock catch 230, a mounting shell plate 220 and the above-mentioned tripping device 100. The mounting shell plate 220 is fixedly arranged in the shell 210, and the tripping device 100 is clamped in the mounting shell plate 220. The tripping device 100 comprises a push rod 110 which can be driven in cooperation with the lock catch 230. The mounting shell plate 220 has a first sliding groove 223 arranged in the tripping direction of the push rod 110 of the tripping device 100. The push rod 110 comprises a body 111, and the body 111 has a first limiting part 114. The body 111 is arranged in the first sliding groove 223 through the first limiting part 114.

[0054] Specifically, referring to Figure 4 , Figure 5 and Figure 7, the mounting shell plate 220 is split by a first shell plate 221 and a second shell plate 222, the first shell plate 221 forms a first sliding groove 223 for accommodating the first limiting part 114. The first sliding groove 223 is semi-closed, and has an opening near one side of the thermal trip triggering part 113 of the body 111 of the push rod 110, so that the thermal trip triggering part 113 of the body 111 can extend out of the first sliding groove 223 and abut against the bimetallic strip 121 of the thermal release 120. The push rod 110 can slide along the first sliding groove 223 to drive the lock catch 230, so that the lock catch 230 is unlocked. The connection process of the release device 100 and the mounting shell plate 220 is more stable and reliable through the cooperation of the first sliding groove 223 and the first limiting part 114. Through the setting of the mounting shell plate 220, the assembly process of the release device 100 is simplified, and the positions of the body 111, the thermal release 120 and the electromagnetic release assembly 130 are independent of each other. The setting of the circuit breaker 200 realizes miniaturization while improving the reliability and safety of the release process of the circuit breaker 200. The specific structure and beneficial effects of the release device 100 have been described in detail above, and will not be repeated here.

[0055] For example, please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , the body 111 has a thermal trip triggering part 113, which includes a triggering rod 113A arranged perpendicularly to the body 111; the body 111 further includes a second limiting part 115 which is opposite to the triggering rod 113A; the mounting shell plate 220 has a second sliding groove 224 arranged in the release direction of the push rod 110 of the release device 100, and the body 111 is arranged in the second sliding groove 224 through the second limiting part 115.

[0056] Specifically, in order to further limit the body 111 and avoid the body 111 from shaking up and down during movement in the release direction, please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , the second shell plate 222 of the mounting shell plate 220 is provided with a second sliding groove 224 in the release direction of the push rod 110, and the first limiting part 114 of the body 111 can slide along the first sliding groove 223 and the second limiting part 115 can slide along the second sliding groove 224, so as to further improve the connection stability between the body 111 and the mounting shell plate 220. Preferably, in order to improve the limiting effect, the number of second limiting parts 115 can be multiple, and the multiple second limiting parts 115 are arranged side by side and spaced apart. The triggering rod 113A of the thermal trip triggering part 113 is opposite to the second sliding groove 224, and the triggering rod 113A is located outside the mounting shell plate 220 to realize abutment with the bimetallic strip 121.

[0057] Optionally, as shown in Figure 7 The mounting shell plate 220 includes a first shell plate 221 and a second shell plate 222 connected together, the first shell plate 221 is provided with a first abutting end 221A on the outer wall near one side of the thermal tripping part 113 of the body 111, the second shell plate 222 is provided with a second abutting end 222A on the outer wall near one side of the thermal tripping part 113 of the body 111, the first abutting end 221A and the second abutting end 222A have a preset interval, and the opposite sides of the thermal tripping part 113 can abut against the first abutting end 221A and the second abutting end 222A respectively when the body 111 moves along the first sliding groove 223 and the second sliding groove 224.

[0058] Specifically, as shown in Figure 7 Since the first sliding groove 223 is semi-closed, it has an opening near one side of the thermal tripping part 113 of the body 111 of the push rod 110, so that the trigger rod 113A of the body 111 can extend out of the first sliding groove 223 and abut against the bimetallic strip 121 of the thermal tripping part 120, and the side of the body 111 away from the trigger rod 113A is provided with a second limiting part 115, the second limiting part 115 is arranged in the second sliding groove 224 of the second shell plate 222, therefore, the area of the first shell plate 221 is smaller than that of the second shell plate 222, so as to expose the trigger rod 113A and part of the thermal tripping part 113 of the body 111.

[0059] In order to limit the movement range of the push rod 110, so as to avoid the push rod 110 from moving in the tripping direction and falling off from the mounting shell plate 220, the first shell plate 221 is provided with a first abutting end 221A on the outer wall near one side of the thermal tripping part 113 of the body 111, the second shell plate 222 is provided with a second abutting end 222A on the outer wall near one side of the thermal tripping part 113 of the body 111, the first abutting end 221A and the second abutting end 222A have a preset interval, and the opposite ends of the thermal tripping part can move a preset distance to abut against the first abutting end 221A or the second abutting end 222A, so that the body 111 can move within the preset interval.

[0060] The above only describes optional embodiments of the present application, and is not used to limit the present application, and the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0061] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not describe various possible combinations again.

Claims

1. A trip unit, characterized by, The push rod (110) and the thermal trip unit (120) and the electromagnetic trip assembly (130) are respectively arranged on opposite sides of the push rod (110); the electromagnetic trip assembly (130) comprises an iron core assembly (131) and a top rod (132) penetrating the iron core assembly (131), the iron core assembly (131) can drive the top rod (132) to move towards one end of the push rod (110), and the top rod (132) can drive the push rod (110) to move towards the tripping direction; the thermal trip unit (120) comprises a bimetallic strip (121), the bimetallic strip (121) is deformed by heat to push the push rod (110) to move towards the tripping direction; the movement of the push rod (110) towards the tripping direction makes the lock catch (230) and the trip catch unlocked.

2. The trip unit of claim 1, wherein, The push rod (110) comprises a body (111), one side of the body (111) is provided with a groove (111A) facing the lock catch (230), and the end of the lock catch (230) can be accommodated in the groove (111A); one side of the groove (111A) is provided with a boss (111B), and the end of the lock catch (230) has an abutting portion (231); the body (111) can be driven to move in the tripping direction to make the boss (111B) abut against the abutting portion (231) of the lock catch (230) and drive the lock catch (230) to rotate towards the direction of unlocking the trip catch.

3. The trip unit of claim 2, wherein, One end of the body (111) has a magnetic trip trigger portion (112), the end face of the magnetic trip trigger portion (112) is oppositely arranged with the end face of the top rod (132) of the electromagnetic trip assembly (130) and has a preset interval, and the top rod (132) can be driven to move towards the body (111) to abut against the magnetic trip trigger portion (112) and push the body (111) to move in the tripping direction.

4. The trip unit of claim 3, wherein, The side of the body (111) away from the magnetic trip trigger end also has a thermal trip trigger portion (113), the thermal trip trigger portion (113) comprises a trigger rod (113A) arranged perpendicularly to the body (111), the side wall of the trigger rod (113A) is oppositely arranged with the bimetallic strip (121) and has a preset interval, the bimetallic strip (121) can be driven to abut against the trigger rod (113A) and push the body (111) to move in the tripping direction through the trigger rod (113A).

5. The trip unit of claim 4 wherein, The body (111) further comprises a first limiting portion (114) between the magnetic trip trigger portion (112) and the thermal trip trigger portion (113); the body (111) is arranged in the mounting shell plate (220) of the circuit breaker (200) and is slidably connected with a first sliding groove (223) of the mounting shell plate (220) through the first limiting portion (114).

6. The trip unit of claim 4 wherein, The body (111) further comprises a second limiting part (115) arranged on the side away from the magnetic tripping end, and the second limiting part (115) is mutually away from the trigger rod (113A); the body (111) is arranged in the mounting shell plate (220) of the circuit breaker (200) and is in sliding connection with the second sliding groove (224) of the mounting shell plate (220) through the second limiting part (115).

7. The trip unit of claim 4 wherein, The tripping device (100) further comprises a reset assembly (140), the reset assembly (140) comprises a torsion spring (141) and a positioning column (142), the positioning column (142) is fixedly arranged in the mounting shell plate (220) of the circuit breaker (200), the torsion spring (141) is sleeved on the outer wall of the positioning column (142) and the end is connected with the body (111), when the body (111) moves in the tripping direction, the torsion spring (141) is compressed to store energy, so as to provide a reset force for the body (111).

8. A circuit breaker characterized by, The circuit breaker (200) comprises a shell (210), a lock catch (230), a mounting shell plate (220) and the tripping device (100) of any one of the preceding claims 1-7, the mounting shell plate (220) is fixedly arranged in the shell (210), the tripping device (100) is clamped in the mounting shell plate (220), the tripping device (100) comprises a push rod (110) capable of driving cooperation with the lock catch (230); the mounting shell plate (220) has a first sliding groove (223) arranged in the tripping direction of the push rod (110) of the tripping device (100); the push rod (110) comprises a body (111), the body (111) has a first limiting part (114), and the body (111) is arranged in the first sliding groove (223) through the first limiting part (114).

9. The circuit breaker of claim 8, wherein, The body (111) has a thermal tripping part (113), the thermal tripping part (113) comprises a trigger rod (113A) arranged perpendicularly to the body (111); the body (111) further comprises a second limiting part (115) mutually away from the trigger rod (113A); the mounting shell plate (220) has a second sliding groove (224) arranged in the tripping direction of the push rod (110) of the tripping device (100), and the body (111) is arranged in the second sliding groove (224) through the second limiting part (115).

10. The circuit breaker of claim 9, wherein, The mounting shell plate (220) comprises a first shell plate (221) and a second shell plate (222) connected together, the first shell plate (221) is provided with a first abutting end (221A) near the outer wall of one side of the thermal release trigger part (113) of the body (111), the second shell plate (222) is provided with a second abutting end (222A) near the outer wall of one side of the thermal release trigger part (113) of the body (111), the first abutting end (221A) and the second abutting end (222A) have a preset interval, when the body (111) moves along the first sliding groove (223) and the second sliding groove (224), the opposite sides of the thermal release trigger part (113) can abut against the first abutting end (221A) and the second abutting end (222A) respectively.

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