A compact molded case circuit breaker with thermal magnetic adjustable alarm non-tripping function

Abstract

The present invention relates to a compact molded case circuit breaker with a thermal magnetic adjustable alarm and non-tripping function, comprising a base, a contact arc extinguishing module, a middle cover, an operating mechanism, an upper cover, a controller cover, an overload adjustable alarm and non-tripping current protection module and a terminal assembly, wherein the overload adjustable alarm and non-tripping current protection module is matched with the operating mechanism, and when the current exceeds a certain multiple of the rated current, the overload adjustable alarm and non-tripping current protection module sends an overload alarm signal; when a short-circuit current occurs in the circuit, the overload adjustable alarm and non-tripping current protection module directly acts to push the operating mechanism to trip the circuit breaker and disconnect the circuit. Compared with the prior art, the circuit breaker has a compact structure and can realize short-circuit protection, overload alarm and adjustable functions.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a compact molded case circuit breaker with a thermal magnetic adjustable alarm non-tripping function. Background Art

[0002] People's requirements for electricity safety are becoming increasingly stringent. Molded case circuit breakers with current protection are widely used due to their compact structure, small size and high cost performance. The release is an important mechanism in the circuit breaker. The function of the release is to convert electrical energy into mechanical action and open the molded case circuit breaker when receiving the trip signal. Traditional releases are divided into electronic releases and thermal magnetic releases, etc. They are generally installed inside the circuit breaker and cooperate with the traction rod of the molded case circuit breaker to achieve the tripping action.

[0003] The trip device of the currently commonly used small current specification molded case circuit breaker is mainly composed of a coil, an iron core, a spring, a pull rod, and a bracket. When the coil passes through an alternating current, a magnetic field is generated inside the coil, and the iron core overcomes the spring force to pull the pull rod, and the pull rod pulls the traction rod of the circuit breaker's operating mechanism to open the circuit breaker.

[0004] Patent CN 101685728 B discloses a thermal magnetic release for small-sized low-voltage circuit breakers, which consists of a bracket, a short-circuit release system and an overload release system separated on both sides of the bracket plate. The electromagnetic coil of the short-circuit release system is wound on a cylindrical static iron core. The short-circuit current flows through the electromagnetic coil, which together with the static iron core generates a magnetic field; when short-circuited, the movable armature overcomes the reaction spring under the action of the magnetic field force. The overload release system includes a thermal element and a bimetallic strip, which are stacked on a boss at the bottom of the bracket. The soft connection connects the thermal element and / or the bimetallic strip in series to the circuit to sense the overload signal. The resistor is connected in series to the thermal element and / or the bimetallic strip to increase the heat generation. The invention improves the working stability and ensures that the circuit breaker can stably and reliably cut off the fault current.

[0005] At present, for 63A frame molded case circuit breakers, due to the small size of 63A frame molded case circuit breakers, 63A frame thermal magnetic molded case circuit breakers often do not have the overload adjustable function, or the circuit breakers with the overload adjustable function are relatively large in overall size, and the existing release module is difficult to meet the requirements, or it is difficult to simultaneously realize the short-circuit protection, overload alarm and adjustable functions.

[0006] In addition, in the existing circuit breaker structure, an insert or nut is usually placed in the center of the arc extinguishing module, and there is a mounting hole at the bottom of the base. When the module is fixed, the module is fixed to the base by screws. In this module fixing form, the screws and nuts occupy part of the space of the module or the base, which increases the overall height of the circuit breaker to a certain extent. Summary of the invention

[0007] The purpose of the present invention is to provide a compact molded case circuit breaker with a thermal magnetic adjustable alarm non-tripping function in order to solve the above problems.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A compact molded case circuit breaker with a thermal magnetic adjustable alarm and non-tripping function comprises a base, a contact arc extinguishing module, a middle cover, an operating mechanism, an upper cover, a controller cover, an overload adjustable alarm and non-tripping current protection module and a terminal assembly, wherein the operating mechanism is mounted on the contact arc extinguishing module of one phase, a plurality of contact arc extinguishing modules are fixed together with a long axis, loaded into the base together, and interlocked with the terminal assembly, the overload adjustable alarm and non-tripping current protection module is loaded into the base, the middle cover is arranged on the base, the upper cover and the controller cover are arranged at the uppermost part to form a closed circuit breaker assembly, the overload adjustable alarm and non-tripping current protection module is matched with the operating mechanism, when the current exceeds a certain multiple of the rated current, the overload adjustable alarm and non-tripping current protection module sends an overload alarm signal; when a short circuit current occurs in the circuit, the overload adjustable alarm and non-tripping current protection module directly acts to push the operating mechanism to trip the circuit breaker and disconnect the circuit.

[0010] Furthermore, the overload adjustable alarm non-tripping current protection module includes:

[0011] A module base;

[0012] One or more electromagnetic components, mounted in the module base, including:

[0013] a magnetic yoke, wherein an electromagnetic coil unit is disposed in the magnetic yoke;

[0014] a pull rod rotatably disposed on the upper part of the yoke, the pull rod being fixedly connected to an armature, the armature being located on the upper part of the electromagnetic coil unit, and a first elastic reset member being further disposed at the bottom of the pull rod; and

[0015] A bimetallic strip and a thermal element, wherein the bimetallic strip and the thermal element are fixedly connected to the magnetic yoke, and a stop block is provided at the upper end of the bimetallic strip;

[0016] A lock rod mechanism is installed on the upper part of the module base and cooperates with the electromagnetic component, including a lock rod and an alarm half shaft nested with the lock rod, the alarm half shaft is rotatable relative to the lock rod, and shafts A are provided at both ends of the lock rod. A second elastic reset member is provided on the shaft A, so that the lock rod and the alarm half shaft have a tendency to rotate toward the direction of the bimetallic strip.

[0017] The locking rod is provided with a hook and one or more flanges matched with the pull rod;

[0018] The alarm semi-shaft is provided with one or more supporting parts matched with the blocking block, and the supporting parts are provided with a pressing piece, and the pressing piece corresponds to the micro switch of the alarm mechanism; and

[0019] A reset push rod is provided on the module base and matches with the hook on the locking rod, and a third elastic reset member is provided at the bottom of the reset push rod;

[0020] In the normal reset state, the hook is stuck on the reset push rod;

[0021] When the current is overloaded, the electromagnetic component acts on the alarm half shaft to deflect the alarm half shaft, and the pressing piece on the alarm half shaft contacts the micro switch to give an alarm;

[0022] When the current is short-circuited, the electromagnetic assembly acts on the locking rod to disengage the hook from the reset push rod. After the disengagement, the reset push rod pushes against the circuit breaker mechanism tripping shaft to disconnect the circuit breaker main circuit.

[0023] Furthermore, a release cover is also provided on the upper part of the module base, and the release cover covers the electromagnetic assembly and the locking rod mechanism.

[0024] Furthermore, the electromagnetic components are provided in 3-5 groups, which are installed in a row in the module base, and then a limit block is installed to limit the initial position of the pull rod.

[0025] Furthermore, the electromagnetic coil unit includes a coil, an iron core, and a coil frame. The coil frame is sleeved outside the iron core, and the coil is sleeved outside the coil frame. The armature is coaxially arranged at intervals on the upper part of the iron core. A guide plate is provided outside the armature. In a short-circuit state, the current in the coil increases, and the armature moves downward, driving the pull rod to flip.

[0026] Furthermore, the pull rod is rotatably arranged on the yoke via axis B, the first elastic reset member comprises an axis C arranged on the pull rod and a spring E sleeved on the axis C, the axis C is parallel to the axis B, and the spring E has a force to flip the pull rod.

[0027] Furthermore, the bimetallic retaining block is a wedge block, and the supporting portion includes an adjusting screw and a nut.

[0028] Furthermore, the alarm half-shaft can be axially moved by a set knob, and the lower end of the knob is inserted into the middle of the groove of the alarm half-shaft. When the knob is rotated, the alarm half-shaft is driven to slide, thereby adjusting the distance between the support part and the wedge block.

[0029] Furthermore, the second elastic reset member includes a spring C and a spring D. The module is also provided with a button for manually controlling the flipping of the pull rod, and a spring B is installed on the button to reset it.

[0030] Furthermore, the locking rod includes a middle cylindrical rod and flanges arranged at both ends of the cylindrical rod, and the alarm semi-axis is a semi-cylindrical shell structure. The alarm semi-axis is nested on the locking rod, and the alarm semi-axis has a certain rotation margin around the cylindrical rod in the middle of the locking rod.

[0031] Furthermore, a base flange is provided at one end of the bottom of the base, and an arc extinguishing module boss is provided at the front end of the contact arc extinguishing module. The contact arc extinguishing module is installed in the base. After installation, the arc extinguishing module boss is located on the upper part of the base flange, and the two are flush. The terminal assembly is provided with a card interface, and the terminal assembly is horizontally plugged into the base. After installation, the card interface simultaneously clamps the arc extinguishing module boss and the base flange. The terminal assembly clamps the arc extinguishing module boss and the base flange at the same time, so that the two cannot be disengaged in the height direction. In this way, the terminal assembly, the arc extinguishing module assembly, and the base form an interlocking and will not loosen naturally. This interlocking structure design avoids the design of a nut installation position or insert in the arc extinguishing module assembly, reduces the overall height of the arc extinguishing module design, and realizes a miniaturized design.

[0032] This structural setting helps to reduce the overall height of the molded case circuit breaker, which has positive significance for the design of circuit breakers with small shells under the trend of miniaturization of molded case circuit breakers.

[0033] Furthermore, a connecting protrusion is provided at the bottom of the base, and a connecting portion matching the connecting protrusion is provided at the bottom of the terminal assembly. The connecting portion is provided with a connecting hole, and the connecting hole is sleeved on the connecting protrusion to achieve a fixed connection between the terminal assembly and the base.

[0034] Furthermore, the connection protrusion is cylindrical, the connection part is in the shape of an elastic thin sheet, and the connection hole is a round hole that matches the cylindrical shape. After being installed in place, the thin sheet at the bottom of the terminal assembly relies on the elasticity of the plastic to allow its round hole to cover the cylindrical boss of the base, so that it is limited in the horizontal direction and cannot be loosened along the base.

[0035] Furthermore, the card interface of the terminal assembly is a C-shaped opening, which simultaneously clamps the arc extinguishing module boss and the base flange so that the two cannot be disengaged in the height direction.

[0036] Furthermore, a pressure plate is provided at the rear end of the contact arc extinguishing module, and the pressure plate is fixed to the base through a connecting piece, and the pressure plate fixes the rear end of the contact arc extinguishing module to the base.

[0037] Furthermore, the length of the pressure plate is consistent with the total width of the contact arc extinguishing module, and the pressure plate is a rectangular plate. A plurality of partitions are provided at the lower part of the pressure plate, so that each phase of the contact arc extinguishing module can form an independent air outlet channel.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) The overload adjustable alarm non-tripping current protection module provided in the circuit breaker can realize the short-circuit protection and overload alarm non-tripping functions simultaneously within a limited space. The electromagnetic assembly has an electromagnetic coil unit inside the yoke, and a bimetallic strip and a thermal element outside the yoke, which respond to the short-circuit or overload process respectively, and cooperate with the locking rod mechanism to realize the disconnection protection or alarm of the circuit breaker. The protection module can be installed in the molded case circuit breaker with a frame of 63A, with reliable operation, compact structure and small size.

[0040] (2) The bimetallic strip's blocking block is a wedge block with a certain slope. The position of the locking rod can be axially adjusted by setting a knob, and the distance between the support part and the wedge block can be adjusted. The size of the relative distance determines how much current overload will cause the module to alarm, thereby realizing the overload adjustable function.

[0041] (3) The present invention adopts a parts interlocking design, and does not need to design a nut installation position or insert in the arc extinguishing module assembly, thereby reducing the overall height of the arc extinguishing module design and achieving a miniaturized design.

[0042] (4) The arc extinguishing module components are generally made of thermosetting materials. The present invention does not design screws and nuts for fastening inside the module, which can avoid local material breakage when the module is installed on the base and tightened.

[0043] (5) The present invention fixes the module on the base at the front and rear of the arc extinguishing module assembly, rather than at the arc extinguishing module assembly and the base. The holes for fastening connection are designed at the corresponding positions to help increase the physical strength of the core part in the middle of the arc extinguishing module, thereby reducing the probability of module damage and base cracking caused by high-intensity air pressure shock during the high-current short-circuit disconnection process of the circuit breaker.

[0044] (6) The pressure plate of the present invention not only fixes the arc extinguishing module assembly but also has the effect of phase insulation, and at the same time effectively provides an air outlet channel for the arc extinguishing module. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 , 2 It is a schematic diagram of the overall explosion structure of an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the overall structure of an overload adjustable alarm non-tripping current protection module;

[0047] Figure 4 for Figure 3 Exploded diagram of

[0048] Figure 5 This is a cross-sectional view of an overload adjustable alarm non-tripping current protection module;

[0049] Figure 6 is a schematic diagram of the structure of the electromagnetic component;

[0050] Figure 7 for Figure 6 Exploded diagram of

[0051] Figure 8 for Figure 6 sectional view of

[0052] Fig. 9 is a structural schematic diagram of a locking rod mechanism;

[0053] Fig.10 This is a schematic diagram of the normal reset state of the overload adjustable alarm non-tripping current protection module;

[0054] Fig.11 This is a schematic diagram of the overload alarm state of the overload adjustable alarm non-tripping current protection module;

[0055] Fig.12 is a schematic cross-sectional structure diagram of an embodiment of the present invention;

[0056] Fig.13 It is a partial schematic diagram of the terminal block assembly, arc extinguishing module and base according to an embodiment of the present invention;

[0057] Fig.14 This is a schematic diagram of the wiring terminal assembly after installation according to an embodiment of the present invention;

[0058] Fig.15 This is a schematic diagram of the installation of the pressure plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] Example

[0061] like Figure 1 , 2A compact molded case circuit breaker with a thermal magnetic adjustable alarm non-tripping function, comprising a base 1, a contact arc extinguishing module 2, a middle cover 3, an operating mechanism 4, an upper cover 5, a controller cover 6, an overload adjustable alarm non-tripping current protection module 7 and a terminal assembly 8, wherein the operating mechanism 4 is installed on the contact arc extinguishing module 2 of one phase, a plurality of contact arc extinguishing modules 2 are fixed together with a long axis, and are installed together in the base 1, and are interlocked with the terminal assembly 8, and the overload adjustable alarm non-tripping current protection module 7 is installed in the terminal assembly 8. In the base 1, the middle cover 3 is covered on the base 1, and the upper cover 5 and the controller cover 6 are covered at the uppermost part to form a closed circuit breaker assembly. The overload adjustable alarm non-tripping current protection module 7 is matched with the operating mechanism 4. When the current exceeds a certain multiple of the rated current, the overload adjustable alarm non-tripping current protection module 7 sends an overload alarm signal; when a short-circuit current occurs in the circuit, the overload adjustable alarm non-tripping current protection module 7 directly acts to push the operating mechanism 4 to trip the circuit breaker and disconnect the circuit.

[0062] Specifically, Figure 3 , 4 5. Overload adjustable alarm non-tripping current protection module 7, including: a module base 300 for installing various components; four electromagnetic components 100, installed in a row in the module base 300, and then loaded with a limit block 301 to limit the initial position, a lock rod mechanism 200, installed on the upper part of the module base 300, and matched with the electromagnetic component 100, a reset push rod 600, arranged on the module base 300, and a third elastic reset member 601 is provided at the bottom of the reset push rod 600, the reset push rod 600 matches the circuit breaker mechanism tripping shaft 800, and the third elastic reset member 601 is a spring A, and the spring A makes the reset push rod flip toward the circuit breaker mechanism tripping shaft 800. In the short circuit state, the reset push rod 600 hits the circuit breaker mechanism tripping shaft 800 to disconnect the main circuit of the circuit breaker. A release cover 400 is also provided on the upper portion of the module base 300 , and the release cover 400 covers the electromagnetic assembly 100 and the locking rod mechanism 200 .

[0063] like Figure 6 , 78. The electromagnetic assembly 100 includes a yoke 108, in which an electromagnetic coil unit is arranged; a pull rod 102, which is rotatably arranged on the upper part of the yoke 108, and the pull rod 102 is fixedly connected to an armature 114, and the armature 114 is located on the upper part of the electromagnetic coil unit. A first elastic reset member is also provided at the bottom of the pull rod 102, and the first elastic reset member includes an axis C116 arranged on the pull rod 102 and a spring E115 sleeved on the axis C116, and the axis C116 is parallel to the axis B103, and the spring E115 has a force to flip the pull rod 102; and a bimetallic strip 104 and a thermal element 105, the bimetallic strip 104 and the thermal element 105 are fixedly connected to the yoke 108 together, and a stop block is provided at the upper end of the bimetallic strip 104.

[0064] The electromagnetic coil unit includes a coil 107, an iron core 110, and a coil 107 frame. The coil 107 frame is sleeved outside the iron core 110, and the coil 107 is sleeved outside the coil 107 frame. The armature 114 is coaxially arranged on the upper part of the iron core 110. A guide plate 113 is arranged outside the armature 114, and a connecting plate 112 is arranged outside the yoke 108. In the short-circuit state, the current in the coil 107 increases, and the armature 114 moves downward, driving the pull rod 102 to flip. The pull rod 102 is rotatably arranged on the yoke 108 through the shaft B103. The bimetallic strip 104 resists the wedge block 101.

[0065] like Fig. 9 The locking rod mechanism 200 includes a locking rod 201 and an alarm half-shaft 202 nested with the locking rod 201. The locking rod includes a cylindrical rod in the middle and flanges arranged at both ends of the cylindrical rod. The alarm half-shaft 202 is a semi-cylindrical shell structure. The alarm half-shaft 202 is nested on the locking rod. The alarm half-shaft 202 is rotatable relative to the locking rod 201, and the alarm half-shaft 202 has a certain rotation margin around the cylindrical rod in the middle of the locking rod. A shaft A2011 is provided at both ends of the locking rod 201, and a second elastic reset part is provided on the shaft A2011, including a spring C203 and a spring D204, so that the locking rod and the alarm half-shaft 202 have a tendency to rotate toward the direction of the bimetallic strip 104, and a hook 2012 and a plurality of flanges 2013 cooperating with the pull rod 102 are provided on the locking rod 201; a plurality of supporting parts 2021 cooperating with the blocking block are provided on the alarm half-shaft 202, and the supporting part 2021 includes an adjusting screw and a nut, and a pressing plate 2022 is provided on the supporting part 2021, and the pressing plate 2022 corresponds to the micro switch 900 of the alarm mechanism, and the micro switch 900 is installed on the module base 300 through the supporting part 901.

[0066] like Figure 4The alarm half-shaft 202 can be moved axially by the provided knob 500. The lower end of the knob 500 is inserted into the middle of the groove of the alarm half-shaft 202. When the knob 500 is rotated, the alarm half-shaft 202 is driven to slide, and the distance between the support part 2021 and the wedge block 101 is adjusted. The size of the relative distance determines how much current overload causes the module to trip, thereby realizing the overload adjustable function.

[0067] like Figure 5 The module is also provided with a button 700 for manually controlling the flipping of the pull rod 102. A spring B701 is installed on the button 700 to reset it, thereby realizing a manual tripping function.

[0068] The specific installation process of this module is as follows: the coil frame 111 is sleeved outside the iron core 110, and then the coil assembly is sleeved and installed in the yoke 108. The thermal element 105, the connecting plate 112, the bimetallic strip 104, and the wedge 101 are welded together. After the coil assembly is installed in the yoke 108, the guide plate 113 is riveted on the yoke 108. Then the spring E115 is installed in the hole below the yoke 108 through the axis C116, and then the pull rod 102 is installed in the hole above the yoke 108 through the axis B103. The side of the entire electromagnetic assembly is fastened to the module base by fixing screws 106, and the lower part is fixed to the module base by screws 109.

[0069] When the main circuit of the circuit breaker is energized, the bimetallic strip 104 welded to the thermal element 105 will bend, and the degree of bending is proportional to the overload current. The entire electromagnetic assembly functions as an electromagnet. When current passes through the main circuit, the coil generates electromagnetic force, which attracts the iron core 114. The armature 114 is stuck in the slot of the pull rod 102. When the electromagnetic force is large enough, it will overcome the reaction force of the spring E115 and pull the pull rod 102 to rotate around the axis B103 until the armature 114 and the iron core 110 are attracted.

[0070] After all four electromagnetic components are installed on the module base 100, the lock rod 201 and the alarm half shaft 202 are nested with each other, and then installed on the module base 100 with the spring C203 and the spring D204 through the shaft A2011. The spring D204 plays the role of resetting the lock rod 201, and the spring C203 plays the role of resetting the alarm half shaft 202. The lock rod 201 and the upper part of the alarm half shaft 202 have a tendency to rotate toward the bimetallic strip 104. The alarm half shaft 202 is installed with an adjusting screw and a nut, and one phase is equipped with a pressing piece 2022. When the main circuit current of the circuit breaker is overloaded, the bimetallic strip 104 will be bent by heat. When it reaches a certain bending degree, the wedge block 101 on its upper part will hit the adjusting screw, so that the alarm half shaft 202 overcomes the force of the spring C203 and rotates.

[0071] Fig.10This is a schematic diagram of the lock rod mechanism in the normal reset state. When the overload current of the circuit breaker main circuit reaches a certain level, such as Fig.11 , the bimetallic strip 104 is bent by the heat, so that the wedge block 101 presses against the adjusting screw, so that the alarm half shaft 202 overcomes the force of the spring C203 and rotates. The support 901 and the micro switch 900 are installed on the release cover 400. When the alarm half shaft 202 rotates to a certain angle, the pressing piece 2022 installed at one end of the alarm half shaft 202 presses the action button of the micro switch 900, so that it outputs an alarm signal. On the contrary, when the current is reduced to a normal level, the heat of the thermal element 105 decreases, the bimetallic strip 104 gradually resets, and the alarm half shaft 202 returns to its original position under the action of the spring C203. Finally, the pressing piece 2022 releases the action button of the micro switch 900, and the alarm signal is released.

[0072] On the other hand, when a short-circuit current passes through the main circuit, the electromagnetic force generated by the coil overcomes the reaction force of the spring E115, attracts the armature 114, and drives the pull rod 102 to flip, so that its upper part touches and drives the flange 2013 at the bottom of the locking rod, causing the locking rod to flip, thereby releasing the module, and the reset push rod 600 hits the circuit breaker mechanism release shaft 800, thereby disintegrating the mechanism to achieve the function of disconnecting the main circuit of the circuit breaker, thereby realizing the short-circuit protection function.

[0073] After the entire thermal-magnetic overload adjustable current protection module is installed into the molded case circuit breaker body, the button 700 and the spring B701 are installed in the middle cover of the circuit breaker. The user can press the button 700 from the outside to push the pull rod 102 to flip it, thereby achieving the effect of tripping the module. The user can manually trip the module, and when other modules are connected externally, such as the leakage module, the module linkage function is achieved.

[0074] After the thermal-magnetic overload adjustable current protection module is installed in the molded case circuit breaker body, it can realize the short-circuit protection function, the overload alarm non-tripping and adjustable function, the manual tripping function, and the function of providing the circuit breaker external linkage interface.

[0075] In order to reduce the overall height of the arc extinguishing module design and realize miniaturization design, such as Fig.12 A base flange 1001 is provided at one end of the bottom of the base 1, and an arc extinguishing module boss 2001 is provided at the front end of the contact arc extinguishing module 2. The contact arc extinguishing module 2 is installed in the base 1. After installation, the arc extinguishing module boss 2001 is located on the upper part of the base flange 1001, and the two are flush with each other. The terminal assembly 8 is provided with a card interface 8001, and the terminal assembly 8 is horizontally plugged into the base 1. After installation, the card interface 8001 simultaneously clamps the arc extinguishing module boss 2001 and the base flange 1001.

[0076] like Fig.13 , 14 A connecting protrusion is provided at the bottom of the base 1, and a connecting portion 8002 matching the connecting protrusion is provided at the bottom of the terminal assembly 8. The connecting portion 8002 is provided with a connecting hole, and the connecting hole is sleeved on the connecting protrusion to realize the fixed connection between the terminal assembly 8 and the base 1; the card interface 8001 of the terminal assembly 8 is a C-shaped opening, which simultaneously clamps the arc extinguishing module boss 2001 and the base flange 1001, so that the two cannot be disengaged in the height direction.

[0077] like Fig.15 A pressure plate 1000 is provided at the rear end of the contact arc extinguishing module 2, and the pressure plate 1000 is fixed on the base 1 through a connecting piece. The pressure plate 1000 fixes the rear end of the contact arc extinguishing module 2 on the base; the length of the pressure plate 1000 is consistent with the total width of the contact arc extinguishing module 2, and the pressure plate 1000 is a rectangular plate. A plurality of partitions 10001 are provided at the lower part of the pressure plate 1000, so that each phase of the contact arc extinguishing module 2 can form an independent air outlet channel 2002.

[0078] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function, characterized in that: It comprises a base (1), a contact arc extinguishing module (2), a middle cover (3), an operating mechanism (4), an upper cover (5), a controller cover (6), an overload adjustable alarm non-tripping current protection module (7) and a terminal block assembly (8), The operating mechanism (4) is mounted on the contact arc extinguishing module (2) of one phase. The plurality of contact arc extinguishing modules (2) are fixed together by a long shaft and installed together in the base (1) and interlocked with the terminal block assembly (8). The overload adjustable alarm non-tripping current protection module (7) is installed in the base (1). The middle cover (3) is installed on the base (1). The upper cover (5) and the controller cover (6) are installed at the uppermost part to form a closed circuit breaker assembly. The overload adjustable alarm non-tripping current protection module (7) is matched with the operating mechanism (4). When the current exceeds a certain multiple of the rated current, the overload adjustable alarm non-tripping current protection module (7) sends out an overload alarm signal; When a short-circuit current occurs in the circuit, the overload adjustable alarm non-tripping current protection module (7) directly operates to push the operating mechanism (4) to cause the circuit breaker to trip and disconnect the circuit; The overload adjustable alarm non-tripping current protection module (7) comprises: a module base (300); One or more electromagnetic components (100), installed in the module base (300), include: a magnetic yoke (108), wherein an electromagnetic coil unit is provided inside the magnetic yoke (108); a pull rod (102) rotatably disposed on the upper part of the yoke (108); the pull rod (102) is fixedly connected to an armature (114); the armature (114) is located on the upper part of the electromagnetic coil unit; and a first elastic reset member is further disposed at the bottom of the pull rod (102); and A bimetallic strip (104) and a thermal element (105), wherein the bimetallic strip (104) and the thermal element (105) are fixedly connected to the magnetic yoke (108), and a stop block is provided at the upper end of the bimetallic strip (104); A locking rod mechanism (200) is installed on the upper part of the module base (300) and cooperates with the electromagnetic assembly (100), comprising a locking rod (201) and an alarm half-shaft (202) nested with the locking rod (201), the alarm half-shaft (202) being rotatable relative to the locking rod (201), and shafts A (2011) are provided at both ends of the locking rod (201), and a second elastic reset member is provided on the shaft A (2011), so that the locking rod and the alarm half-shaft (202) have a tendency to rotate in the direction of the bimetallic strip (104). The locking rod (201) is provided with a hook (2012) and one or more flanges (2013) that match the pull rod (102); The alarm semi-shaft (202) is provided with one or more supporting parts (2021) that cooperate with the blocking block, and the supporting part (2021) is provided with a pressing sheet (2022), and the pressing sheet (2022) corresponds to the micro switch (900) of the alarm mechanism; and A reset push rod (600) is provided on the module base (300) and matches the hook (2012) on the locking rod (201); a third elastic reset member (601) is provided at the bottom of the reset push rod (600); In a normal reset state, the hook (2012) is stuck on the reset push rod (600); A base flange (1001) is provided at one end of the bottom of the base (1), and an arc extinguishing module boss (2001) is provided at the front end of the contact arc extinguishing module (2). The contact arc extinguishing module (2) is installed in the base (1). After being installed in place, the arc extinguishing module boss (2001) is located on the upper part of the base flange (1001), and the two are flush with each other. The terminal assembly (8) is provided with a card interface (8001). The terminal assembly (8) is horizontally plugged into the base (1). After being installed in place, the card interface (8001) simultaneously clamps the arc extinguishing module boss (2001) and the base flange (1001).

2. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 1, characterized in that: A release cover (400) is also provided on the upper portion of the module base (300), and the release cover (400) covers the electromagnetic assembly (100) and the locking rod mechanism (200); The electromagnetic components (100) are provided in 3-5 groups, which are installed in a row in the module base (300), and then a limit block (301) is installed to limit the initial position of the pull rod (102).

3. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 1, characterized in that: The electromagnetic coil unit comprises a coil (107), an iron core (110), and a coil (107) frame, wherein the coil (107) frame is sleeved outside the iron core (110), and the coil (107) is sleeved outside the coil (107) frame, and the armature (114) is coaxially arranged at intervals on the upper part of the iron core (110), and a guide plate (113) is arranged outside the armature (114). When in a short-circuit state, the current in the coil (107) increases, and the armature (114) moves downward, driving the pull rod (102) to flip.

4. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 3, characterized in that: The pull rod (102) is rotatably arranged on the yoke (108) via the axis B (103); the first elastic reset member comprises an axis C (116) arranged on the pull rod (102) and a spring E (115) sleeved on the axis C (116); the axis C (116) is parallel to the axis B (103); the spring E (115) has a force to flip the pull rod (102); the bimetallic strip (104) stop block is a wedge block (101); and the support portion (2021) comprises an adjusting screw (2032) and a nut (2031).

5. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 4, characterized in that: The alarm half-shaft (202) can be axially moved by means of a knob (500), and the lower end of the knob (500) is inserted into the middle of a groove of the alarm half-shaft (202). When the knob (500) is rotated, the alarm half-shaft (202) is driven to slide, thereby adjusting the distance between the support portion (2021) and the wedge block (101).

6. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 1, characterized in that: The second elastic reset member comprises a spring C (203) and a spring D (204). The module is also provided with a button (700) for manually controlling the flipping of the pull rod (102). The button (700) is mounted with a spring B (701) for resetting the button. The lock rod comprises a cylindrical rod in the middle and flanges arranged at both ends of the cylindrical rod, the alarm half-shaft (202) is a semi-cylindrical shell structure, the alarm half-shaft (202) is nested on the lock rod, and the alarm half-shaft (202) has a certain rotation margin around the cylindrical rod in the middle of the lock rod.

7. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 1, characterized in that: The base (1) is provided with a connecting protrusion at the bottom, and the terminal block assembly (8) is provided with a connecting portion (8002) matching the connecting protrusion at the bottom, and the connecting portion (8002) is provided with a connecting hole, and the connecting hole is sleeved on the connecting protrusion to achieve a fixed connection between the terminal block assembly (8) and the base (1); the clamping interface (8001) of the terminal block assembly (8) is a C-shaped opening, which clamps the arc extinguishing module boss (2001) and the base flange (1001) at the same time, so that the two cannot be separated in the height direction.

8. A compact molded case circuit breaker with thermal magnetic adjustable alarm and non-tripping function according to claim 1, characterized in that: A pressure plate (1000) is provided at the rear end of the contact arc extinguishing module (2); the pressure plate (1000) is fixed to the base (1) via a connecting piece; the pressure plate (1000) fixes the rear end of the contact arc extinguishing module (2) to the base; the length of the pressure plate (1000) is consistent with the total width of the contact arc extinguishing module (2); the pressure plate (1000) is a rectangular plate; a plurality of partitions (10001) are provided at the bottom of the pressure plate (1000), so that each phase of the contact arc extinguishing module (2) can form an independent air outlet channel (2002).

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