Double-contact circuit breaker

Abstract

The invention relates to the technical field of double-contact circuit breakers, and discloses a double-contact circuit breaker which comprises a mounting unit, a warning unit and a limiting unit, the mounting unit comprises a circuit breaker shell, a handle is arranged in an inner cavity of the circuit breaker shell, the handle is rotatably connected to two opposite side walls of the inner cavity of the circuit breaker shell, a handle torsion spring is arranged on the handle, and the warning unit is connected with the limiting unit. A lock catch is arranged in an inner cavity of the circuit breaker shell, and a main shaft is arranged on the lock catch. According to the device, when a first mounting plate rotates, knocking plates distributed in an arc shape can be gradually pushed to rotate under the assistance of a rotating rod and a second bearing, when the knocking plates rotate, the knocking plates can knock on a sound plate, so that the sound plate makes a sound, and when the sound plate makes the sound, the knocking plates can knock on the sound plate to make the sound. And at the moment, the sound can be transmitted out from the opened buzzing opening, and the buzzing opening is gradually and completely opened, so that the transmitted sound is loud, and people are reminded of a short circuit condition in the circuit breaker shell.

Description

Technical Field

[0001] The invention belongs to the technical field of double-contact circuit breakers, and in particular relates to a double-contact circuit breaker. Background Art

[0002] In modern power systems, circuit breakers play a vital role. They can quickly cut off the current when a circuit fails, protecting electrical equipment and personnel. Traditional circuit breakers usually adopt a single contact structure, which may not meet higher performance requirements in some cases. With the continuous growth of power demand and the increasing complexity of electrical equipment, higher requirements are placed on the reliability, speed and stability of circuit breakers.

[0003] At present, the short-circuit breaking scheme of the existing technology miniature circuit breaker mechanism relies on the electromagnetic coil to generate a magnetic field, the moving and static contacts are attracted, and the moving contact drives the push rod to push the lock to unlock, so that the circuit breaker is opened. The response time is slow, and the contact opening time is slow, resulting in a reduction in the breaking current limiting capacity. At the same time, the existing double-contact circuit breaker will often open when a short circuit occurs. However, when the opening occurs, the staff often cannot be aware of it in the first time, which may easily lead to a long period of power outage.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A double-contact circuit breaker, comprising an installation unit, a warning unit and a limit unit, wherein the installation unit comprises a circuit breaker housing, wherein a handle is provided in an inner cavity of the circuit breaker housing, wherein the handle is rotatably connected to two opposite side walls of the inner cavity of the circuit breaker housing, wherein a handle torsion spring is provided on the handle, wherein a lock is provided in the inner cavity of the circuit breaker housing, wherein a main shaft is provided on the lock, wherein two ends of the main shaft are rotatably connected to the inner wall of the circuit breaker housing, wherein an upper moving contact and a lower moving contact are also installed on the main shaft, wherein the upper moving contact and the lower moving contact and the lock are provided with a connecting piece, wherein a second protrusion is provided between the upper moving contact and the lower moving contact, wherein a first protrusion is provided on the lock, wherein a soft copper wire is further provided on the lock, wherein a jump buckle shaft pin is further provided on the lock, wherein a jump buckle is installed on the jump buckle shaft pin, wherein a U-shaped rod is provided between the jump buckle and the handle, wherein a tension spring shaft is rotatably provided on the inner wall of the circuit breaker housing, wherein a mechanism spring is provided on the tension spring shaft, wherein the other end of the mechanism spring is provided on the lock; The warning unit comprises two mounting supports, the two mounting supports are respectively mounted at the bottom of the inner cavity of the circuit breaker housing, the two mounting supports are symmetrical to each other, the first bearings are mounted on opposite side walls of the two mounting supports, the two first bearings are symmetrical to each other, a rotating rod is arranged in the inner cavity of the two first bearings, a rotating disk is arranged on the rotating rod, a first mounting plate and a second mounting plate are respectively fixedly mounted on the rotating disk, two torsion springs are arranged on the rotating rod, and two ends of the two torsion springs are respectively arranged on the opposite side wall of the first bearing and the rotating disk; The limiting unit comprises a sealed sliding door, which is arranged on the inner wall of the circuit breaker housing. One end of the sealed sliding door close to the inner cavity of the circuit breaker housing is fixedly connected to a moving plate, and a positioning block is fixedly installed on the moving plate.

[0006] As a preferred embodiment of the present invention, side panels are fixedly installed on both side walls opposite to each other in the inner cavity of the circuit breaker housing, and the two side panels are symmetrical to each other. A first sliding mechanism is arranged between the two side panels and the inner wall of the circuit breaker housing, and the first sliding mechanism includes two guide slots, and the two guide slots are symmetrical to each other. Guide sliders are slidably installed in the inner cavities of the two guide slots, and the two guide sliders are symmetrical to each other. A sealing plate is fixedly installed on one side wall opposite to the two guide sliders.

[0007] As a preferred embodiment of the present invention, the two guide slot cavities are each provided with a first return spring, one end of the two first return springs are respectively fixedly connected to the guide slider, and the other end of the two first return springs are respectively fixedly connected to the bottom of the guide slot inner cavity.

[0008] As a preferred embodiment of the present invention, a side wall of the circuit breaker housing is provided with a plurality of buzzer ports which are equidistantly distributed, and each buzzer port is respectively matched with a sealing plate.

[0009] As a preferred embodiment of the present invention, a side wall of the circuit breaker housing away from the buzzer port is provided with a plurality of second bearings distributed in an arc shape, each of the second bearings is provided with a rotating rod, each of the rotating rods is fixedly mounted with a knocking plate, and each of the knocking plates is distributed in an arc shape.

[0010] As a preferred embodiment of the present invention, a plurality of arc-shaped sound plates are fixedly mounted on the side of the circuit breaker housing away from the buzzer port, and each of the sound plates is respectively matched with the knocking plate.

[0011] As a preferred embodiment of the present invention, the two side walls of the circuit breaker housing located on the sealed sliding door are provided with a plurality of equally spaced installation slots, each of the installation slots is symmetrical to each other, and the two side walls opposite to each other of the sealed sliding door are provided with a plurality of equally spaced snap-in slots, each of the snap-in slots is symmetrical to each other.

[0012] As a preferred embodiment of the present invention, each of the inner cavities of the installation slot is provided with a second sliding mechanism, the second sliding mechanism includes two movable slide grooves, the two movable slide grooves are respectively opened on the two opposite side walls of the inner cavity of the installation slot, and the inner cavities of the two movable slide grooves are both slidably installed with movable sliders, the two movable sliders are symmetrical to each other, and a fixed plate is fixedly installed on the one side wall of the two movable sliders that are opposite to each other.

[0013] As a preferred embodiment of the present invention, a second return spring and a clamping block are fixedly installed at both ends of each fixed plate, and each of the second return springs is fixedly connected to the inner wall of the installation slot at one end away from the fixed plate, and each of the clamping blocks is respectively fitted with the clamping slot.

[0014] As a preferred embodiment of the present invention, one end of the first mounting plate away from the turntable is respectively adapted to the lock buckle and a plurality of knocking plates.

[0015] Compared with the prior art, the present invention has the following beneficial effects: According to the present invention, when the lock is rotated, the extrusion force of the side wall can be used to squeeze the first mounting plate to drive the rotating disk to rotate with the assistance of the rotating rod and the first bearing. When the first mounting plate is rotated, it can pass through the notch formed between the two side plates arranged in the inner cavity of the circuit breaker housing, so that the first mounting plate can squeeze the arranged sealing plate, so that the sealing plate can move horizontally downward with the assistance of the guide groove and the guide slider in the first sliding mechanism, so that the sealing plate can lose the sealing of the buzzer opening opened on the side wall of the circuit breaker housing. At the same time, when the first mounting plate is rotated, it can gradually push the knocking plate arranged in an arc shape to rotate with the assistance of the rotating rod and the second bearing. When the knocking plate rotates, it can knock on the sound plate, so that the sound plate makes a sound. When the sound plate makes a sound, the sound can be transmitted from the opened buzzer opening, and as the buzzer opening is gradually opened, the transmitted sound can be made louder, so as to remind people that a short circuit occurs in the circuit breaker housing.

[0016] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the attached picture: Figure 1 It is a three-dimensional structural schematic diagram of a double-contact circuit breaker; Figure 2 It is a partial structural schematic diagram of a double-contact circuit breaker; Figure 3 It is a schematic diagram of the cross-sectional structure of a circuit breaker housing of a double-contact circuit breaker; Figure 4 It is a schematic diagram of the side structure of a circuit breaker housing of a double-contact circuit breaker; Figure 5 It is a schematic diagram of the partial structure of a circuit breaker housing of a double-contact circuit breaker; Figure 6 It is a schematic diagram of a partial side view of the circuit breaker housing of a double-contact circuit breaker; Figure 7 A double-contact circuit breaker Figure 6 The enlarged structural diagram at A in the middle; Figure 8 A schematic diagram of the inner structure of a rectangular notch of a double-contact circuit breaker; Fig. 9 The figure is a schematic diagram of the turntable structure of a double-contact circuit breaker.

[0018] In the figure: 100, mounting unit; 101, circuit breaker housing; 1011, handle; 1012, handle torsion spring; 1013, U-shaped rod; 1014, tension spring shaft; 1015, mechanism spring; 1016, connecting piece; 1017, main shaft; 1018, first protrusion; 1019, second protrusion; 102, lock; 1021, jump buckle; 1022, jump buckle shaft pin; 1023, soft copper wire; 1024, upper moving contact; 1025, lower moving contact; 103, side plate; 104, buzzer; 200, warning unit; 201, mounting support; 2011, turntable; 2012, first bearing; 2013, rotating rod; 2014, torsion spring; 2015, first mounting plate; 2016, second mounting plate; 202, sealing plate; 2021, guide slide groove; 2022, first return spring; 2023, guide slider; 203, second bearing; 2031, rotating rod; 2032, knocking plate; 2033, sound plate; 400, limit unit; 401, sealed sliding door; 4011, snap-in notch; 4012, movable plate; 4013, positioning block; 402, installation notch; 4021, movable slide groove; 4022, movable slider; 4023, fixed plate; 4024, snap-in block; 4025, second return spring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0020] Embodiment 1:

[0021] like Figures 1 to 9As shown, a double-contact circuit breaker includes an installation unit 100, a warning unit 200 and a limit unit 400, wherein the installation unit 100 includes a circuit breaker housing 101, wherein the inner cavity of the circuit breaker housing 101 is provided with a handle 1011, wherein the handle 1011 is rotatably connected to two opposite side walls of the inner cavity of the circuit breaker housing 101, wherein the handle 1011 is provided with a handle torsion spring 1012, wherein the inner cavity of the circuit breaker housing 101 is provided with a lock 102, wherein the lock 102 is provided with a main shaft 1017, wherein both ends of the main shaft 1017 are rotatably connected to the inner wall of the circuit breaker housing 101, wherein the main shaft 1017 is also provided with a There are an upper moving contact 1024 and a lower moving contact 1025, a connecting piece 1016 is provided on the upper moving contact 1024 and the lower moving contact 1025 and the lock buckle 102, a second protrusion 1019 is provided between the upper moving contact 1024 and the lower moving contact 1025, a first protrusion 1018 is provided on the lock buckle 102, a soft copper wire 1023 is also provided on the lock buckle 102, a jump buckle shaft pin 1022 is also provided on the lock buckle 102, a jump buckle 1021 is installed on the jump buckle shaft pin 1022, a U-shaped rod 1013 is provided between the jump buckle 1021 and the handle 1011, and a circuit breaker housing 10 The inner wall of the circuit breaker housing 101 is also rotatably provided with a tension spring shaft 1014, on which a mechanism spring 1015 is provided, and the other end of the mechanism spring 1015 is provided on the lock buckle 102; the warning unit 200 includes two mounting supports 201, which are respectively mounted on the bottom of the inner cavity of the circuit breaker housing 101, and the two mounting supports 201 are symmetrical to each other. The opposite side walls of the two mounting supports 201 are both provided with first bearings 2012, and the two first bearings 2012 are symmetrical to each other. The inner cavities of the two first bearings 2012 are provided with rotating rods 2013, and the rotating rods 2013 are provided with There is a turntable 2011, on which a first mounting plate 2015 and a second mounting plate 2016 are fixedly mounted respectively, and two torsion springs 2014 are arranged on the rotating rod 2013, and the two ends of the two torsion springs 2014 are respectively arranged on the side wall opposite to the first bearing 2012 and the turntable 2011; the limiting unit 400 includes a sealed sliding door 401, and the sealed sliding door 401 is arranged on the inner wall of the circuit breaker housing 101, and one end of the sealed sliding door 401 close to the inner cavity of the circuit breaker housing 101 is fixedly connected to a movable plate 4012, and a positioning block 4013 is fixedly mounted on the movable plate 4012.When the lock buckle 102 rotates, it can squeeze the first mounting plate 2015 through the squeezing force of the side wall to drive the rotating disk 2011 to rotate with the assistance of the rotating rod 2013 and the first bearing 2012. When the first mounting plate 2015 rotates, it can pass through the notch formed between the two side plates 103 arranged in the inner cavity of the circuit breaker housing 101, so that the first mounting plate 2015 can squeeze the sealing plate 202, so that the sealing plate 202 can move horizontally downward with the assistance of the guide groove 2021 and the guide slider 2023 in the first sliding mechanism, so that the sealing plate 202 loses its grip on the circuit breaker. The buzzer port 104 opened on the side wall of the circuit breaker housing 101 is sealed, and when the first mounting plate 2015 rotates, the knocking plate 2032 arranged in an arc shape can be gradually pushed to rotate with the assistance of the rotating rod 2031 and the second bearing 203. When the knocking plate 2032 rotates, it can knock on the sound plate 2033, so that the sound plate 2033 makes a sound. When the sound plate 2033 makes a sound, the sound can be transmitted from the opened buzzer port 104. As the buzzer port 104 is gradually fully opened, the transmitted sound can be made louder, thereby reminding people that a short circuit occurs in the circuit breaker housing 101.

[0022] like Figures 3 to 6 As shown, in a specific embodiment, side plates 103 are fixedly installed on both opposite side walls of the inner cavity of the circuit breaker housing, the two side plates 103 are symmetrical to each other, a first sliding mechanism is arranged between the two side plates 103 and the inner wall of the circuit breaker housing 101, the first sliding mechanism comprises two guide slide grooves 2021, the two guide slide grooves 2021 are symmetrical to each other, guide sliders 2023 are slidably installed in the inner cavity of the two guide slide grooves 2021, the two guide sliders 2023 are symmetrical to each other, and a sealing plate 202 is fixedly installed on one side wall opposite to the two guide sliders 2023. In this setting, the installation position of the first sliding mechanism and the installation position of the sealing plate 202 are determined.

[0023] like Figures 3 to 7 As shown, further, the inner cavities of the two guide slots 2021 are both provided with first return springs 2022, one end of the two first return springs 2022 is respectively fixedly connected to the guide slider 2023, and the other end of the two first return springs 2022 is respectively fixedly connected to the bottom of the inner cavity of the guide slot 2021. In this configuration, when the first mounting plate 2015 loses the squeezing force on the sealing plate 202, the sealing plate 202 can be reset with the assistance of the guide slot 2021 and the guide slider 2023 in the first sliding mechanism and the first return spring 2022, so as to close the buzzer port 104 opened on the side wall of the circuit breaker housing 101, thereby avoiding the situation where dust enters the inner cavity of the circuit breaker housing 101 to a certain extent.

[0024] like Figures 3 to 6 As shown, further, a plurality of equally spaced buzzer ports 104 are provided on one side wall of the circuit breaker housing 101, and each buzzer port 104 is respectively matched with the sealing plate 202. In this configuration, the opening position of the buzzer port 104 and the relationship between the buzzer port 104 and the sealing plate 202 are determined.

[0025] like Figures 3 to 6 As shown, further, a side wall of the circuit breaker housing 101 away from the buzzer port 104 is provided with a plurality of second bearings 203 arranged in an arc shape, each second bearing 203 is provided with a rotating rod 2031, each rotating rod 2031 is fixedly mounted with a knocking plate 2032, and each knocking plate 2032 is arranged in an arc shape. In this configuration, the installation position of the knocking plate 2032 is determined, ensuring that the knocking plate 2032 can swing.

[0026] like Figures 3 to 6 As shown, further, a plurality of arc-shaped sound plates 2033 are fixedly installed on one side of the circuit breaker housing 101 away from the buzzer port 104, and each sound plate 2033 is respectively matched with the knocking plate 2032. In this arrangement, it is ensured that the knocking plate 2032 can knock on the sound plate 2033 when rotating, so that the sound plate 2033 can make a sound, and when the sound plate 2033 makes a sound, the sound can be transmitted from the opened buzzer port 104, and as the buzzer port 104 is gradually fully opened, the transmitted sound can be made louder, thereby reminding people that a short circuit occurs in the circuit breaker housing 101.

[0027] Embodiment 2:

[0028] The difference between the above embodiment and this embodiment is that: Figures 3 to 6 and Figure 8 As shown, a double-contact circuit breaker, the circuit breaker housing 101 is provided with a plurality of equally spaced installation slots 402 on both side walls of the sealed sliding door 401, each installation slot 402 is symmetrical to each other, and the opposite side walls of the sealed sliding door 401 are provided with a plurality of equally spaced clamping slots 4011, each clamping slot 4011 is symmetrical to each other. In this setting, the opening position of the clamping slot 4011 and the opening position of the installation slot 402 are determined.

[0029] like Figure 8As shown, in a specific embodiment, each of the mounting slots 402 is provided with a second sliding mechanism, and the second sliding mechanism includes two movable slide grooves 4021, and the two movable slide grooves 4021 are respectively provided on the two opposite side walls of the mounting slot 402, and the two movable slide grooves 4021 are both slidably installed with movable sliders 4022, and the two movable sliders 4022 are mutually symmetrical, and the two opposite side walls of the two movable sliders 4022 are fixedly installed with fixed plates 4023. In this setting, the installation position and components of the second sliding mechanism are determined, and it is ensured that when the staff pushes the sealed sliding door 401 into the circuit breaker housing 101, the sealed sliding door 401 will be able to squeeze the clamping block 4024 to drive the fixed plate 4023 to move horizontally with the assistance of the movable slide groove 4021 and the movable slider 4022.

[0030] like Figure 8 As shown, further, a second return spring 4025 and a clamping block 4024 are respectively fixedly installed at both ends of each fixing plate 4023, and one end of each second return spring 4025 away from the fixing plate 4023 is respectively fixedly connected to the inner wall of the installation slot 402, and each clamping block 4024 is respectively matched with the clamping slot 4011. In this configuration, when the clamping block 4024 is aligned with the clamping slot 4011 opened at the sealing sliding door 401, the fixing plate 4023 can move with the assistance of the second return spring 4025, so that the fixing plate 4023 can drive the clamping block 4024 to be inserted into the inner cavity of the clamping slot 4011.

[0031] like Figures 1 to 6 As shown, further, one end of the first mounting plate 2015 away from the rotating disk 2011 is respectively adapted to the lock buckle 102 and a plurality of knocking plates 2032. In this configuration, the relationship between the first mounting plate 2015, the lock buckle 102 and the knocking plates 2032 is determined, ensuring that the first mounting plate 2015 can rotate and the knocking plates 2032 can rotate.

[0032] The implementation principle of a double-contact circuit breaker in this embodiment is as follows: When a short circuit occurs inside the circuit breaker housing 101, the upper moving contact 1024 and the lower moving contact 1025 will be able to sense the short circuit current first, so that the upper moving contact 1024 and the lower moving contact 1025 can be repelled in advance, so that the upper moving contact 1024 and the lower moving contact 1025 can rotate clockwise with the assistance of the main shaft 1017. When the upper moving contact 1024 and the lower moving contact 1025 rotate a certain angle At this time, the second protrusion 1019 provided on the upper moving contact 1024 and the lower moving contact 1025 will be able to contact the first protrusion 1018 provided on the lock buckle 102, so that the first protrusion 1018 can drive the lock buckle 102 to rotate with the assistance of the main shaft 1017 (because the second protrusion 1019 gives the first protrusion 1018 a squeezing force, so that the first protrusion 1018 can drive the lock buckle 102 to rotate on the main shaft 1017); When the lock buckle 102 rotates, the squeezing force of the side wall can squeeze the first mounting plate 2015 to drive the rotating disk 2011 to rotate with the assistance of the rotating rod 2013 and the first bearing 2012. When the first mounting plate 2015 rotates, it can pass through the notch formed between the two side plates 103 provided in the inner cavity of the circuit breaker housing 101, so that the first mounting plate 2015 can squeeze the sealing plate 202, so that the sealing plate 202 can be guided in the first sliding mechanism. The sliding groove 2021 and the guide slider 2023 , so that the sealing plate 202 loses its sealing effect on the buzzer opening 104 provided on the side wall of the circuit breaker housing 101 (when the first mounting plate 2015 loses its squeezing force on the sealing plate 202, the sealing plate 202 can be reset with the assistance of the guide slot 2021 and the guide slider 2023 in the first sliding mechanism and the first reset spring 2022, so as to close the buzzer opening 104 provided on the side wall of the circuit breaker housing 101, thereby preventing dust from entering the inner cavity of the circuit breaker housing 101 to a certain extent); At the same time, when the first mounting plate 2015 rotates, it will gradually push the knocking plate 2032 arranged in an arc shape to rotate with the assistance of the rotating rod 2031 and the second bearing 203. When the knocking plate 2032 rotates, it will knock on the sound plate 2033, so that the sound plate 2033 makes a sound. When the sound plate 2033 makes a sound, the sound can be transmitted from the opened buzzer port 104. As the buzzer port 104 is gradually fully opened, the sound can be made louder, thereby reminding people that a short circuit occurs in the circuit breaker housing 101. When the turntable 2011 rotates, the turntable 2011 will be able to drive the second mounting plate 2016 to rotate, so that the second mounting plate 2016 can lose the limit of the positioning block 4013. At this time, when the staff hears the sound, they can carry out maintenance. The staff will open the sealed sliding door 401 to inspect the position where the short circuit occurs in the inner cavity of the circuit breaker housing 101 (when the maintenance is completed, the staff will push the sealed sliding door 401 into the circuit breaker housing 101, and the sealed sliding door 401 will be able to squeeze the clamping block 4024 to drive the fixing plate 4023 to move on the sliding plate The locking plate 4023 is able to move horizontally with the assistance of the groove 4021 and the movable slider 4022 until the locking block 4024 is aligned with the locking groove 4011 opened at the sealed sliding door 401. At this time, the fixed plate 4023 will be able to move with the assistance of the second reset spring 4025, so that the fixed plate 4023 can drive the locking block 4024 to be inserted into the inner cavity of the locking groove 4011. At this time, the staff resets the overhauled lock buckle 102 and the upper moving contact 1024 and the lower moving contact 1025 through the handle 1011, so that the sealed sliding door 401 can be further limited by the positioning block 4013).

Claims

1. A double-contact circuit breaker, comprising a mounting unit (100), a warning unit (200) and a limit unit (400), characterized in that: The installation unit (100) comprises a circuit breaker housing (101); a handle (1011) is provided in the inner cavity of the circuit breaker housing (101); the handle (1011) is rotatably connected to two opposite side walls of the inner cavity of the circuit breaker housing (101); a handle torsion spring (1012) is provided on the handle (1011); a lock buckle (102) is provided in the inner cavity of the circuit breaker housing (101); a main shaft (1017) is provided on the lock buckle (102); two ends of the main shaft (1017) are rotatably connected to the inner wall of the circuit breaker housing (101); an upper moving contact (1024) and a lower moving contact (1025) are also installed on the main shaft (1017); the upper moving contact (1024) and the lower moving contact (1025) are provided with connecting pieces on the lock buckle (102). (1016), a second protrusion (1019) is provided between the upper moving contact (1024) and the lower moving contact (1025), a first protrusion (1018) is provided on the lock buckle (102), a soft copper wire (1023) is also provided on the lock buckle (102), a trip buckle shaft pin (1022) is also provided on the lock buckle (102), a trip buckle (1021) is installed on the trip buckle shaft pin (1022), a U-shaped rod (1013) is provided between the trip buckle (1021) and the handle (1011), a tension spring shaft (1014) is rotatably provided on the inner wall of the circuit breaker housing (101), a mechanism spring (1015) is provided on the tension spring shaft (1014), and the other end of the mechanism spring (1015) is provided on the lock buckle (102); The warning unit (200) comprises two mounting supports (201), the two mounting supports (201) are respectively mounted on the bottom of the inner cavity of the circuit breaker housing (101), the two mounting supports (201) are symmetrical to each other, first bearings (2012) are mounted on opposite side walls of the two mounting supports (201), the two first bearings (2012) are symmetrical to each other, a rotating rod (2013) is arranged in the inner cavity of the two first bearings (2012), a rotating disk (2011) is arranged on the rotating rod (2013), a first mounting plate (2015) and a second mounting plate (2016) are respectively fixedly mounted on the rotating disk (2011), two torsion springs (2014) are arranged on the rotating rod (2013), and two ends of the two torsion springs (2014) are respectively arranged on opposite side walls of the first bearing (2012) and the rotating disk (2011); The limiting unit (400) comprises a sealed sliding door (401), the sealed sliding door (401) being arranged on the inner wall of the circuit breaker housing (101), one end of the sealed sliding door (401) close to the inner cavity of the circuit breaker housing (101) being fixedly connected to a movable plate (4012), and a positioning block (4013) being fixedly mounted on the movable plate (4012).

2. A double-contact circuit breaker according to claim 1, characterized in that: Side plates (103) are fixedly mounted on two opposite side walls of the inner cavity of the circuit breaker housing (101); the two side plates (103) are symmetrical to each other; a first sliding mechanism is arranged between the two side plates (103) and the inner wall of the circuit breaker housing (101); the first sliding mechanism comprises two guide slide grooves (2021); the two guide slide grooves (2021) are symmetrical to each other; guide sliders (2023) are slidably mounted in the inner cavities of the two guide slide grooves (2021); the two guide sliders (2023) are symmetrical to each other; and a sealing plate (202) is fixedly mounted on one opposite side wall of the two guide sliders (2023).

3. A double-contact circuit breaker according to claim 2, characterized in that: The inner cavities of the two guide slide grooves (2021) are each provided with a first return spring (2022), one end of the two first return springs (2022) are respectively fixedly connected to the guide slider (2023), and the other ends of the two first return springs (2022) are respectively fixedly connected to the bottom of the inner cavity of the guide slide groove (2021).

4. A double-contact circuit breaker according to claim 1, characterized in that: A plurality of buzzer ports (104) are provided on one side wall of the circuit breaker housing (101) and are distributed at equal intervals, and each buzzer port (104) is respectively fitted with a sealing plate (202).

5. A double-contact circuit breaker according to claim 1, characterized in that: A side wall of the circuit breaker housing (101) away from the buzzer port (104) is provided with a plurality of second bearings (203) distributed in an arc shape, each of the second bearings (203) is provided with a rotating rod (2031), each of the rotating rods (2031) is fixedly mounted with a knocking plate (2032), and each of the knocking plates (2032) is distributed in an arc shape.

6. A double-contact circuit breaker according to claim 5, characterized in that: A plurality of arc-shaped sound plates (2033) are fixedly mounted on one side of the circuit breaker housing (101) away from the buzzer port (104), and each of the sound plates (2033) fits with the knocking plate (2032).

7. A double-contact circuit breaker according to claim 1, characterized in that: The circuit breaker housing (101) is provided with a plurality of equally spaced installation slots (402) on both side walls of the sealed sliding door (401), and each of the installation slots (402) is symmetrical to each other. The opposite side walls of the sealed sliding door (401) are provided with a plurality of equally spaced snap-in slots (4011), and each of the snap-in slots (4011) is symmetrical to each other.

8. A double-contact circuit breaker according to claim 7, characterized in that: Each of the mounting slots (402) is provided with a second sliding mechanism, the second sliding mechanism comprising two movable slide grooves (4021), the two movable slide grooves (4021) are respectively arranged on two opposite side walls of the mounting slot (402) inner cavity, and movable sliders (4022) are slidably installed in the inner cavities of the two movable slide grooves (4021), the two movable sliders (4022) are symmetrical to each other, and a fixing plate (4023) is fixedly installed on one side wall of the two movable sliders (4022) opposite to each other.

9. A double-contact circuit breaker according to claim 8, characterized in that: A second return spring (4025) and a clamping block (4024) are respectively fixedly mounted at both ends of each of the fixing plates (4023); one end of each of the second return springs (4025) away from the fixing plate (4023) is fixedly connected to the inner wall of the mounting slot (402); and each of the clamping blocks (4024) is respectively fitted with the clamping slot (4011).

10. A double-contact circuit breaker according to claim 1, characterized in that: One end of the first mounting plate (2015) away from the rotating disk (2011) is respectively adapted to the lock buckle (102) and a plurality of knocking plates (2032).

Images