Three-phase switching circuit breaker

Abstract

The invention provides a three-phase switching circuit breaker, which relates to the technical field of circuit connection and comprises a circuit breaker shell, three groups of metal connecting ends are fixedly arranged at the upper end and the lower end of the circuit breaker shell; auxiliary guide rails are fixedly arranged on the two sides of the interior of the circuit breaker shell. Two groups of upper electrode holders are fixedly arranged on the two sides of the upper part in the circuit breaker shell, and two groups of lower electrode holders are fixedly arranged on the two sides of the lower part in the circuit breaker shell; the upper electrode holder and the lower electrode holder are respectively connected with a group of metal connecting ends; a commutator is arranged, a centralized control switching mechanism is provided, by controlling a control shifting button, a control sliding rod drives a control strip to move, then stretching and retracting of a control piston are adjusted, the control piston is completely stretched or contracted, a middle piston is automatically balanced and adjusted, and the commutator is promoted to be communicated with a power-on contact A or a power-on contact B through a control rod; switching between the two wire sequences is achieved, control is convenient, and the problem that an existing circuit breaker lacks a centralized control switching mechanism is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit connection, and in particular to a three-phase switching circuit breaker. Background Art

[0002] The large equipment and transformers currently in use are mainly powered by three-phase electricity. According to the three-phase characteristics, the power supply direction can be adjusted by swapping the sequence of two of the lines. For example, when driving a motor, the forward and reverse directions can be adjusted by switching the line sequence to achieve precise control.

[0003] The circuit breakers currently used have the following disadvantages: 1. The current switching method is mainly to perform switching through two KM contactors, which cannot achieve overall unified switching, inconvenient switching, and lacks a centralized control switching mechanism; 2. Lack of sealed arc protection function, easy to arc during switching; 3. The function of monitoring and warning pressure is lacking, which makes it difficult to ensure the internal protection of the circuit breaker. Summary of the invention

[0004] In view of this, the present invention provides a three-phase switching circuit breaker, which has a warning chamber, which can monitor the overall sealing of the circuit breaker and trigger an alarm when the air pressure is insufficient.

[0005] The present invention provides a circuit breaker that is convenient for three-phase switching, specifically comprising: a circuit breaker shell, a side protection shell is provided on one side of the circuit breaker shell, and three groups of metal connection ends are fixedly provided at the upper and lower ends of the circuit breaker shell; auxiliary guide rails are fixedly provided on both sides of the interior of the circuit breaker shell; two groups of upper electrode seats are fixedly provided on both sides of the upper interior of the circuit breaker shell, and two groups of lower electrode seats are fixedly provided on both sides of the lower interior of the circuit breaker shell; the upper electrode seats and the lower electrode seats are respectively connected to one group of metal connection ends; fixed connection seats are fixedly provided on the outsides of the two middle groups of metal connection ends, and two groups of connection plates are fixedly provided between the sides of the upper and lower groups of fixed connection seats; an intermediate frame is fixedly provided at the middle and upper part of the interior of the circuit breaker shell, and the intermediate frame is located below the upper fixed connection seat; a warning compartment is connected to the left side of the circuit breaker shell; two groups of gate valves are fixedly provided at the upper and lower ends of the right side of the circuit breaker shell; and an intermediate seat is fixedly provided in the middle of the right side of the circuit breaker shell.

[0006] Optionally, two groups of copper plates of different lengths are integrally provided on both sides of the bottom of the upper electrode seat, and a power contact A is fixedly provided outside the short copper plate, and a power contact B is fixedly provided outside the long copper plate.

[0007] Optionally, a commutator is rotatably arranged on the top of the lower electrode seat, and the commutator is a V-shaped structure. Semicircular buckle grooves are opened on the outside of both ends of the commutator, and the two semicircular buckle grooves can be buckled on the outside of the power-on contact A and the power-on contact B respectively, or they can not touch each other; the two groups of commutators are arranged symmetrically around the center; brushes are fixedly arranged on the top of the lower electrode seat, and the rotating shaft of the commutator is passed through the brushes.

[0008] Optionally, an intermediate piston is fixedly arranged in the middle of the bottom of the intermediate frame, a bow frame is fixedly arranged at the telescopic end of the intermediate piston, and a control rod is fixedly arranged in the middle below the bow frame; a strip-shaped through groove is opened in the middle of the commutator, and the control rod slides in the strip-shaped through groove.

[0009] Optionally, the main body of the warning chamber is a piston cylinder, a breath adjustment hole is opened in the middle of the outside of the warning chamber, two groups of contact copper sheets are fixedly arranged inside the warning chamber near the circuit breaker shell, a pressure piston is slidingly arranged in the warning chamber, a copper ring is arranged on the side of the pressure piston close to the contact copper sheet, and a spring is arranged in the warning chamber to make the pressure piston fit the contact copper sheet. When the pressure piston fits the contact copper sheet, the two groups of contact copper sheets are connected to trigger the alarm program.

[0010] Optionally, a movable valve plate is slidably inserted in the middle of the gate valve, and a through groove is opened on the outer edge of the movable valve plate; an exhaust check valve is connected to the outside of the upper gate valve, and the exhaust check valve is a convex rod type check valve; an intake check valve is connected to the outside of the lower gate valve.

[0011] Optionally, guide rods are fixedly provided at both ends of the upper and lower sides of the middle seat, and springs are arranged on the outer surface of the guide rods and pass through the movable valve plate; long connecting rods are rotatably provided on the upper and lower sides of the middle seat, and control sliding piles are fixedly provided on the outer ends of the long connecting rods, and the control sliding piles slide in the through grooves outside the movable valve plate; short connecting rods are hingedly provided in the middle of the long connecting rods, and the other ends of the short connecting rods are hingedly connected to pull rods, which slide on the upper and lower ends of the middle seat, and the pull rods are slidably connected to the side protective shell.

[0012] Optionally, a protective cover is fixedly provided on the operating surface of the circuit breaker shell, a control dial button is rotatably provided below the protective cover, and a control slide rod is eccentrically fixedly provided on one side of the control dial button close to the circuit breaker shell; four equidistantly distributed V-grooves are provided on the outside of the control dial button, and an automatic lock that can fit with the V-groove is provided in the protective cover.

[0013] Optionally, a connecting compartment is fixedly arranged above the position of the circuit breaker shell in the protective cover, and the connecting compartment is connected to the intermediate frame; a control piston is connected to the bottom of the connecting compartment, a control strip is fixedly arranged at the telescopic end of the control piston, and a sliding groove is opened on the outside of the control strip.

[0014] Optionally, the control slide rod slides in the slide groove of the control strip; when the control piston is fully extended, the middle piston is fully retracted, and the commutator contacts the energized contact A; when the control piston is fully retracted, the middle piston is fully extended, and the commutator contacts the energized contact B; when the control piston is in a semi-extended state, the middle piston is semi-retracted, and the commutator does not contact the energized contact A and the energized contact B.

[0015] The beneficial effects are as follows: 1. The present invention is provided with a commutator and provides a centralized control switching mechanism. By controlling the control dial, the control slide rod drives the control bar to move, thereby adjusting the extension and retraction of the control piston, fully extending or contracting the control piston, and automatically balancing and adjusting the intermediate piston. The commutator is connected to the energized contact A or the energized contact B through the control rod, thereby realizing the switching between the two line sequences, and the control is convenient and synchronous.

[0016] 2. Setting a gate valve can facilitate filling gas and sealing the circuit breaker. Open the upper gate valve to extract all the air in the circuit breaker shell by vacuuming. Open the lower gate valve to suck sulfur hexafluoride into the inside of the circuit breaker shell. The metal sheet can be blocked by sulfur hexafluoride to provide an arc protection function, avoid arcing during switching, and avoid ignition and damage inside the circuit breaker, thereby improving safety.

[0017] 3. Setting up a warning chamber can monitor the overall sealing of the circuit breaker. When sulfur hexafluoride is input, the increased pressure will push the pressure piston outward; after the sulfur hexafluoride is consumed, the pressure piston automatically resets through the spring, contacts the two sets of contact copper sheets, connects the two sets of contact copper sheets, and feeds back to the alarm program for remote alarm, which is sent to the control terminal to prompt the need to replenish sulfur hexafluoride. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a three-dimensional structure according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a three-dimensional cross-sectional structure according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the internal structure of an embodiment of the present invention is shown; Figure 4 In the embodiment according to the present invention, Figure 3 A schematic diagram of the structure from another angle; Figure 5 The embodiment according to the present invention is shown Figure 3 A side view structural schematic diagram of; Figure 6 A schematic diagram of a transmission structure according to an embodiment of the present invention is shown; Figure 7It shows a schematic diagram of the disconnected state structure according to an embodiment of the present invention; Figure 8 A schematic diagram of a switching state structure according to an embodiment of the present invention is shown.

[0019] List of reference numerals: 1. Circuit breaker housing; 101. Metal connection terminal; 102. Auxiliary guide rail; 2. Upper electrode seat; 201. Power contact A; 202. Power contact B; 3. Lower electrode seat; 301. Commutator; 302. Brush; 4. Fixed connection seat; 401. Connection plate; 5. Intermediate frame; 501. Intermediate piston; 502. Bow frame; 503. Control rod; 6. Warning compartment; 601. Contact copper sheet; 602, pressure piston; 7, gate valve; 701, movable valve plate; 8, exhaust check valve; 9, intake check valve; 10, intermediate seat; 1001, guide rod; 1002, long connecting rod; 1003, control slide pile; 1004, short connecting rod; 1005, pull rod; 11, protective cover; 12, connecting chamber; 13, control piston; 14, control strip; 15, control dial button; 1501, control slide rod. DETAILED DESCRIPTION

[0020] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. Example 1

[0021] Please refer to Figures 1 to 8 As shown: The present invention proposes a circuit breaker that is convenient for three-phase switching, comprising: a circuit breaker shell 1, a side protection shell is arranged on one side of the circuit breaker shell 1, and three groups of metal connection ends 101 are fixedly arranged at the upper and lower ends of the circuit breaker shell 1; auxiliary guide rails 102 are fixedly arranged on both sides of the inside of the circuit breaker shell 1; two groups of upper electrode seats 2 are fixedly arranged on both sides of the upper part of the inside of the circuit breaker shell 1, and two groups of lower electrode seats 3 are fixedly arranged on both sides of the lower part of the inside of the circuit breaker shell 1; the upper electrode seats 2 and the lower electrode seats 3 are respectively connected to a group of metal connection ends 101; the outsides of the two middle groups of metal connection ends 101 are fixedly arranged with fixed connection seats 4, and two groups of connection plates 401 are fixedly arranged between the sides of the upper and lower groups of fixed connection seats 4; an intermediate frame 5 is fixedly arranged at the middle and upper part of the inside of the circuit breaker shell 1, and the intermediate frame 5 is located below the upper fixed connection seat 4; a warning compartment 6 is connected to the left side of the circuit breaker shell 1; two groups of gate valves 7 are fixedly arranged at the upper and lower ends of the right side of the circuit breaker shell 1; and an intermediate seat 10 is fixedly arranged in the middle of the right side of the circuit breaker shell 1.

[0022] Two groups of copper plates of different lengths are integrally arranged on both sides of the bottom of the upper electrode holder 2. A power contact A201 is fixedly arranged outside the short copper plate, and a power contact B202 is fixedly arranged outside the long copper plate.

[0023] Among them, a commutator 301 is rotatably arranged on the top of the lower electrode holder 3. The commutator 301 is a V-shaped structure. Semicircular buckle grooves are opened on the outside of both ends of the commutator 301. The two semicircular buckle grooves can be buckled on the outside of the power contact A201 and the power contact B202 respectively, or they can not touch each other; the two groups of commutators 301 are arranged symmetrically around the center; the top of the lower electrode holder 3 is fixedly provided with a brush 302, and the rotating shaft of the commutator 301 is passed through the brush 302.

[0024] Among them, an intermediate piston 501 is fixedly arranged in the middle of the bottom of the intermediate frame 5, a bow frame 502 is fixedly arranged at the telescopic end of the intermediate piston 501, and a control rod 503 is fixedly arranged in the middle below the bow frame 502; a strip-shaped through groove is opened in the middle of the commutator 301, and the control rod 503 slides in the strip-shaped through groove.

[0025] Among them, the main body of the warning chamber 6 is a piston cylinder, and a breath adjustment hole is opened in the middle of the outside of the warning chamber 6. Two groups of contact copper sheets 601 are fixedly arranged in the position near the circuit breaker shell 1 inside the warning chamber 6. A pressure piston 602 is slidably arranged in the warning chamber 6, and a copper ring is arranged on the side of the pressure piston 602 close to the contact copper sheet 601. A spring is arranged in the warning chamber 6 to make the pressure piston 602 fit the contact copper sheet 601. When the pressure piston 602 fits the contact copper sheet 601, the two groups of contact copper sheets 601 are connected to trigger the alarm program.

[0026] Among them, a movable valve plate 701 is slidably inserted in the middle of the gate valve 7, and a through groove is opened on the outer edge of the movable valve plate 701; the upper gate valve 7 is externally connected to an exhaust check valve 8, which is a convex rod type check valve; the lower gate valve 7 is externally connected to an intake check valve 9.

[0027] Among them, guide rods 1001 are fixedly provided at both ends of the upper and lower sides of the middle seat 10, and springs are arranged on the outer surface of the guide rods 1001 and pass through the movable valve plate 701; long connecting rods 1002 are rotatably provided on the upper and lower sides of the middle seat 10, and control sliding piles 1003 are fixedly provided at the outer ends of the long connecting rods 1002, and the control sliding piles 1003 slide in the through grooves outside the movable valve plate 701; short connecting rods 1004 are hingedly provided in the middle of the long connecting rods 1002, and the other ends of the short connecting rods 1004 are hingedly connected to pull rods 1005, and the pull rods 1005 slide on the upper and lower ends of the middle seat 10, and the pull rods 1005 are slidably connected to the side protective shell.

[0028] Among them, a protective cover 11 is fixedly provided on the operating surface of the circuit breaker housing 1, a control dial button 15 is rotatably provided below the protective cover 11, and a control slide bar 1501 is eccentrically fixedly provided on one side of the control dial button 15 close to the circuit breaker housing 1; four V-grooves equidistantly distributed are opened on the outside of the control dial button 15, and an automatic lock that can fit with the V-groove is provided in the protective cover 11.

[0029] Among them, a connecting compartment 12 is fixedly arranged above the position of the circuit breaker housing 1 inside the protective cover 11, and the connecting compartment 12 is connected to the intermediate frame 5; a control piston 13 is connected to the bottom of the connecting compartment 12, and a control strip 14 is fixedly arranged at the telescopic end of the control piston 13, and a sliding groove is opened on the outside of the control strip 14.

[0030] Among them, the control slide rod 1501 slides in the slide groove of the control strip 14; when the control piston 13 is fully extended, the middle piston 501 is fully contracted, and the commutator 301 contacts the energized contact A201; when the control piston 13 is fully contracted, the middle piston 501 is fully extended, and the commutator 301 contacts the energized contact B202; when the control piston 13 is in a semi-extended state, the middle piston 501 is semi-contracted, and the commutator 301 does not contact the energized contacts A201 and the energized contacts B202.

[0031] like Figure 1-8 As shown, the circuit breaker housing 1 is assembled in the power distribution cabinet of the equipment in use, and is connected in sequence by using the metal connection end 101, and is tapped as needed; the vacuum pump is connected to the exhaust check valve 8 to exhaust air, and the upper pull rod 1005 is pulled out, and the long connecting rod 1002 is rotated in conjunction with the short connecting rod 1004. When the long connecting rod 1002 rotates, the movable valve plate 701 is pulled out by controlling the sliding pile 1003, and the gate valve 7 on the upper side is opened, and then all the air in the circuit breaker housing 1 is exhausted by exhausting air; Then the air intake check valve 9 is connected to the tank body, sulfur hexafluoride is pre-filled in the tank body, and then the pull rod 1005 at the bottom is pulled out, and the long connecting rod 1002 is rotated in conjunction with the short connecting rod 1004. When the long connecting rod 1002 rotates, the movable valve plate 701 is pulled out by controlling the sliding pile 1003, and the gate valve 7 at the bottom is opened to suck sulfur hexafluoride into the interior of the circuit breaker shell 1 to form a sealed environment; thus, filling the circuit breaker with sulfur hexafluoride can avoid arcing, prevent ignition, and ensure power transmission. Example 2

[0032] On the basis of Example 1, Figure 4 As shown, when sulfur hexafluoride increases, the pressure piston 602 is pushed to move outward; after the sulfur hexafluoride is consumed, the pressure piston 602 is automatically reset by the spring, contacting the two groups of contact copper sheets 601, connecting the two groups of contact copper sheets 601, and feeding back to the alarm program for remote alarm, which is sent to the control terminal, indicating that sulfur hexafluoride needs to be supplemented, and manual supplementation is sufficient at this time. Example 3

[0033] On the basis of Example 1, when power is required, the control dial button 15 is rotated 90 degrees, and the control dial button 15 is self-locked through the automatic lock on the protective cover 11. During this period, the control slide bar 1501 drives the control bar 14 to move, thereby adjusting the extension and retraction of the control piston 13: The control piston 13 is fully extended, the intermediate piston 501 is fully retracted, and the commutator 301 is brought into contact with the energized contact A201 through the control rod 503; The control piston 13 is fully retracted and the intermediate piston 501 is fully extended, and the commutator 301 is caused to communicate with the energized contact B202 through the control rod 503, thereby realizing the switching between the two line sequences.

[0034] Specific usage and function of this embodiment: In the present invention, when in use, the circuit breaker housing 1 is assembled in the power distribution cabinet of the equipment, and the metal connection ends 101 are used to connect in sequence and tap as needed; Connect the vacuum pump to the exhaust check valve 8 to exhaust air, pull out the upper pull rod 1005, and rotate the long connecting rod 1002 with the short connecting rod 1004. When the long connecting rod 1002 rotates, use the control slide pile 1003 to pull out the movable valve plate 701, open the upper gate valve 7, and then completely exhaust the air in the circuit breaker housing 1 by exhausting air; Then, the air inlet check valve 9 is connected to the tank body, sulfur hexafluoride is pre-filled in the tank body, and then the lower pull rod 1005 is pulled out, and the long connecting rod 1002 is rotated in conjunction with the short connecting rod 1004. When the long connecting rod 1002 rotates, the movable valve plate 701 is pulled out by controlling the sliding pile 1003, and the gate valve 7 below is opened to suck sulfur hexafluoride into the interior of the circuit breaker housing 1 to form a sealed environment; When sulfur hexafluoride is charged, the pressure is increased, and the pressure piston 602 is pushed outward when the sulfur hexafluoride increases; after the sulfur hexafluoride is consumed, the pressure piston 602 is automatically reset by the spring, contacts the two sets of contact copper sheets 601, connects the two sets of contact copper sheets 601, and feeds back to the alarm program for remote alarm, which is sent to the control terminal to prompt that sulfur hexafluoride needs to be supplemented; Arc protection is provided by sulfur hexafluoride; When disconnected, the control piston 13 is in a semi-extended state, the middle piston 501 is semi-retracted, and the commutator 301 does not contact the energized contact A201 and the energized contact B202. When power is needed, the control dial 15 is rotated 90 degrees, and then the control dial 15 is self-locked. During this period, the control slide bar 1501 drives the control bar 14 to move, thereby adjusting the extension and retraction of the control piston 13, fully extending the control piston 13, and fully retracting the middle piston 501, and the control rod 503 is used to promote the commutator 301 to contact the energized contact A201; or fully retracting the control piston 13, and the middle piston 501 is fully extended, and the commutator 301 is promoted to communicate with the energized contact B202 through the control rod 503, thereby realizing the switching between the two line sequences.

[0035] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0036] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0037] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A circuit breaker convenient for three-phase switching, characterized in that: include: A circuit breaker shell (1), wherein three groups of metal connection ends (101) are fixedly arranged at the upper and lower ends of the circuit breaker shell (1); auxiliary guide rails (102) are fixedly arranged on both sides of the interior of the circuit breaker shell (1); two groups of upper electrode seats (2) are fixedly arranged on both sides of the interior of the circuit breaker shell (1), and two groups of lower electrode seats (3) are fixedly arranged on both sides of the interior of the circuit breaker shell (1); the upper electrode seats (2) and the lower electrode seats (3) are respectively connected to a group of metal connection ends (101); fixed connection seats (4) are fixedly arranged on the outside of the two middle groups of metal connection ends (101), and two groups of connection plates (401) are fixedly arranged between the sides of the upper and lower groups of fixed connection seats (4); a metal connection seat (401) is fixedly arranged on the upper middle part of the interior of the circuit breaker shell (1). The circuit breaker housing (1) is provided with an intermediate frame (5), the intermediate frame (5) being located below the upper fixed connection seat (4); the left side of the circuit breaker housing (1) is connected with a warning compartment (6); the upper and lower ends of the right side of the circuit breaker housing (1) are fixedly provided with two groups of gate valves (7); the middle of the right side of the circuit breaker housing (1) is fixedly provided with an intermediate seat (10); the bottom sides of the upper electrode seat (2) are integrally provided with two groups of copper plates of different lengths, the short copper plates are fixedly provided with an energizing contact A (201), and the long copper plates are fixedly provided with an energizing contact B (202); the top of the lower electrode seat (3) is rotatably provided with a commutator (301), the commutator (301) is a V-shaped structure, and buckle grooves are provided on the outside of both ends of the commutator (301), and the two buckle grooves can be The two sets of commutators (301) are arranged symmetrically with respect to the center; a brush (302) is fixedly arranged on the top of each lower electrode holder (3), and a rotating shaft of the commutator (301) is inserted into the brush (302); an intermediate piston (501) is fixedly arranged in the middle of the bottom of the intermediate frame (5), a bow-shaped frame (502) is fixedly arranged at the telescopic end of the intermediate piston (501), and a control rod (503) is fixedly arranged in the middle below the bow-shaped frame (502); a strip-shaped through groove is opened in the middle of the commutator (301), and the control rod (503) fits and slides in the strip-shaped through groove; the main body of the warning chamber (6) is a piston cylinder, and a There is a breath adjustment hole, two groups of contact copper sheets (601) are fixedly arranged at a position near the circuit breaker housing (1) inside the warning chamber (6), a pressure piston (602) is slidably arranged inside the warning chamber (6), a copper ring is arranged on a side of the pressure piston (602) close to the contact copper sheet (601), and a spring is arranged inside the warning chamber (6) to make the pressure piston (602) fit the contact copper sheet (601). When the pressure piston (602) fits the contact copper sheet (601), the two groups of contact copper sheets (601) are connected to trigger an alarm program; the control slide bar (1501) fits and slides in the slide groove of the control strip (14); when the control piston (13) is fully extended, the intermediate piston (501) is fully retracted, and the commutator (301) is in contact with the energized contact A (201);When the control piston (13) is fully retracted, the intermediate piston (501) is fully extended, and the commutator (301) contacts the energized contact B (202); when the control piston (13) is in a semi-extended state, the intermediate piston (501) is semi-retracted, and the commutator (301) does not contact the energized contact A (201) and the energized contact B (202). ; 2. A circuit breaker for facilitating three-phase switching as claimed in claim 1, characterized in that: A movable valve plate (701) is slidably inserted in the middle of each of the gate valves (7), and a through groove is provided on the outer edge of each of the movable valve plates (701); an air extraction check valve (8) is externally connected to the upper gate valve (7), and the air extraction check valve (8) is a convex stem type check valve; and an air intake check valve (9) is externally connected to the lower gate valve (7).

3. A circuit breaker for facilitating three-phase switching as claimed in claim 1, characterized in that: Guide rods (1001) are fixedly provided at both ends of the upper and lower sides of the middle seat (10), and a spring is arranged outside the guide rod (1001) and passes through the movable valve plate (701); long connecting rods (1002) are rotatably provided on the upper and lower sides of the middle seat (10), and control sliding piles (1003) are fixedly provided at the outer ends of the long connecting rods (1002), and the control sliding piles (1003) slide in the through groove outside the movable valve plate (701); short connecting rods (1004) are hingedly provided in the middle of the long connecting rods (1002), and the other ends of the short connecting rods (1004) are hingedly connected to pull rods (1005), and the pull rods (1005) slide on the upper and lower ends of the middle seat (10), and the pull rods (1005) are slidably connected to the side protective shell.

4. A circuit breaker for facilitating three-phase switching as claimed in claim 1, characterized in that: The operating surface of the circuit breaker housing (1) is fixedly provided with a protective cover (11), a control dial button (15) is rotatably provided below the protective cover (11), and a control slide bar (1501) is eccentrically fixedly provided on a side of the control dial button (15) close to the circuit breaker housing (1); four V-grooves equidistantly distributed are provided on the outside of the control dial button (15), and an automatic lock capable of fitting into the V-grooves is provided in the protective cover (11).

5. A circuit breaker for facilitating three-phase switching as claimed in claim 4, characterized in that: A connection chamber (12) is fixedly provided at an upper position of the circuit breaker housing (1) inside the protective cover (11), and the connection chamber (12) is in communication with the intermediate frame (5); a control piston (13) is connected to the bottom of the connection chamber (12), a control strip (14) is fixedly provided at the telescopic end of the control piston (13), and a sliding groove is provided on the outside of the control strip (14).

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