Circuit breaker

Abstract

The utility model provides a circuit breaker, which comprises a handle mechanism, an operating mechanism, a shell and at least one phase pole unit, the phase pole unit comprises a moving contact and a static contact, the moving contact is arranged on a rotating shaft, a contact spring is arranged between the moving contact and the rotating shaft, the handle mechanism is connected with the operating mechanism, the operating mechanism is connected with the rotating shaft, and the static contact is arranged in the shell. The handle mechanism drives the operating mechanism to drive the rotating shaft to rotate, the rotating shaft drives the moving contact to rotate to be connected or disconnected with the static contact, and the handle mechanism, the operating mechanism and the at least one phase pole unit are installed in the shell. When the operating mechanism drives the rotating shaft to drive the moving contact to rotate towards the closing direction, the baffle plate stops the moving contact from rotating, the rotating shaft continuously rotates to compress the contact spring, so that the rotating shaft is in contact with the baffle plate, the baffle plate is driven to move to release the limiting of the moving contact by the baffle plate, and the contact spring releases energy to drive the moving contact to quickly rotate to be closed with the static contact. The structure is simple.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker. Background Art

[0002] Each pole of a multi-pole circuit breaker is equipped with a moving contact and a stationary contact. The multiple moving contacts are mounted on a rotating shaft. An operating mechanism drives the shaft to rotate, causing the multiple moving contacts to close or open with the corresponding stationary contacts. The multiple moving contacts are synchronized by physical positioning of the shaft. Physical positioning requires high standards for the injection molding process of existing parts, and the moving contacts are easily deformed after high temperatures during spot welding. When the multiple moving contacts are closed with the stationary contacts, they may not be completely synchronized. Because the product lacks an energy storage mechanism, slow contact closure or low contact pressure at the moment of closing (closing of the moving and stationary contacts) can cause arcing, which directly affects product safety and reduces product life.

[0003] In existing technologies, an energy storage mechanism is added to a single-pole circuit breaker. During closing, the energy storage mechanism stores energy and delays the closing of the moving and stationary contacts. After the energy storage mechanism completes the energy storage, it instantly releases the energy, closing the moving and stationary contacts. However, this existing technology uses an operating handle to drive the energy storage mechanism, failing to consider the synchronization issues of the energy storage mechanism in multi-pole circuit breakers, making it difficult to use in multi-pole circuit breakers. Furthermore, the structure of existing energy storage mechanisms is relatively complex. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a circuit breaker with a simple connection structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The present application provides a circuit breaker, comprising a handle mechanism, an operating mechanism, a housing and at least one phase pole unit, wherein the phase pole unit comprises a moving contact and a static contact, the moving contact being mounted on a rotating shaft, a contact spring being arranged between the moving contact and the rotating shaft, the handle mechanism being connected to the operating mechanism, the operating mechanism being connected to the rotating shaft, the handle mechanism driving the operating mechanism to rotate the rotating shaft, the rotating shaft driving the moving contact to rotate and close or disconnect the moving contact, the handle mechanism, the operating mechanism and at least one phase pole unit being mounted in the housing, and further comprising a baffle, the baffle being located on a path where the moving contact rotates in a closing direction, when the operating mechanism drives the rotating shaft to drive the moving contact to rotate in the closing direction, the baffle blocks the rotation of the moving contact, the rotating shaft continues to rotate to compress the contact spring, causing the rotating shaft to contact the baffle, and driving the baffle to move to release the baffle's limit on the moving contact, so that the contact spring releases energy to drive the moving contact to rotate rapidly and close the static contact.

[0007] In one possible implementation, the rotating shaft includes at least one first driving structure, the baffle includes at least one first driven structure and at least one first blocking portion for blocking the moving contact, and at least one first driving structure cooperates with at least one first driven structure to enable the rotating shaft to drive the baffle to move.

[0008] In one possible implementation, it includes multiple phase pole units, which are arranged side by side along the axial direction of the rotating shaft, the moving contacts of the multiple phase pole units are all installed on a rotating shaft, an operating mechanism is connected to the rotating shaft, a handle mechanism is connected to the operating mechanism, and a baffle is provided with multiple first blocking parts respectively used to block the moving contacts of the multiple phase pole units. The rotating shaft is provided with multiple first driving structures arranged at intervals along the axial direction of the rotating shaft corresponding to the multiple phase pole units, and the baffle is provided with multiple first driven structures corresponding one-to-one to the multiple first driving structures.

[0009] In one possible implementation, the first driving structure is a first boss, and the first driven structure is a first groove or a first hole that cooperates with the first boss; a first inclined surface is provided on the first boss, and a second inclined surface that fits with the first inclined surface is provided in the first groove or the first hole, and the first inclined surface cooperates with the second inclined surface so that the rotating shaft drives the baffle to move upward along the first direction.

[0010] In a possible implementation, the shell includes an upper shell and a lower shell, the upper shell and the lower shell are closed along a first direction, and the baffle is slidably arranged along the first direction.

[0011] In one possible implementation, a plurality of protective pole accommodating cavities are formed in the lower shell by partitions for accommodating the plurality of phase pole units. The baffle includes a plurality of baffles arranged in parallel at intervals and a connecting portion. The connecting portion connects the plurality of baffles into one. The gaps between adjacent baffles are used to avoid the partitions. The first passive structure is arranged on the baffle.

[0012] In one possible implementation, the first driving structure is a first boss, the rotating shaft protrudes downward and is provided with a first driving arm, the first driving arm extends toward the baffle and is provided with a first boss, the first boss is provided with a first inclined surface, and an avoidance space is formed above the first boss; the first driven structure is a first hole, the upper side of the first hole is provided with a second inclined surface that fits the first inclined surface, the first blocking portion is provided below the first hole, the first inclined surface cooperates with the second inclined surface, so that the rotating shaft drives the baffle to move upward, and when the moving contact and the static contact are closed, the first boss is inserted into the first hole.

[0013] In one possible implementation, the moving contact includes a first connection part, a second connection part and a third connection part that are bent and connected in sequence, so that an avoidance area is formed between the first connection part and the second connection part. When the moving contact and the static contact are closed, the first blocking part of the baffle is located inside the avoidance area. When the moving contact and the static contact are disconnected, the first blocking part of the baffle is located outside the avoidance area. A moving contact is provided on the third connection part of the moving contact, and a static contact corresponding to the moving contact is provided on the static contact.

[0014] In one possible implementation, when the moving contact and the static contact are disconnected, the blocking plate of the baffle is located between the moving contact and the static contact, isolating the moving contact and the static contact; when the moving contact and the static contact are closed, the blocking plate of the baffle releases the isolation between the moving contact and the static contact.

[0015] In a possible implementation, an elastic member is provided between the baffle and the housing, and the elastic member drives the baffle to move downward in a first direction or toward the lower housing.

[0016] In one possible implementation, the connecting portion of the baffle is provided with a first mounting portion, the shell is provided with a second mounting portion corresponding to the first mounting portion, and both ends of the elastic member are fixedly mounted on the first mounting portion and the second mounting portion, respectively.

[0017] In one possible implementation, the circuit breaker is a residual current circuit breaker, and a zero-sequence current transformer, a leakage release and a leakage detection circuit are also provided in the shell. The loop of each phase pole unit passes through the zero-sequence current transformer, and the leakage detection circuit is connected to the zero-sequence current transformer for detecting residual current.

[0018] Compared with the prior art, the circuit breaker provided in the present application is provided with a contact spring between the moving contact and the rotating shaft. The moving contact is mounted on the rotating shaft through the contact spring. The contact spring can play the role of overtravel, and the contact spring, rotating shaft, moving contact and baffle also constitute a closing energy storage mechanism, which can accelerate the closing of the moving contact and the static contact, shorten the closing time, and reduce the damage of the arc. The present application uses a baffle to directly block the moving contact, and drives the baffle to release its blockage of the moving contact through the rotating shaft. The closing energy storage mechanism can be realized by using the existing contact spring. There is no need to change the layout of the existing circuit breaker. Only a baffle needs to be added, and the overall structure is simple.

[0019] Furthermore, the circuit breaker of the present application is applied to a multi-pole circuit breaker, including multiple phase pole units for connecting a multi-pole circuit. The baffle is driven by a rotating shaft to release its obstruction to the moving contact, thereby ensuring the consistency of rapid closing of multiple phase pole units.

[0020] Furthermore, the rotating shaft includes a plurality of first driving structures arranged at intervals, and the baffle includes a plurality of first actuated structures arranged at intervals. The first driving structure corresponds to the first actuated structure one-to-one. The first driving structure and the first actuated structure are arranged as a combination of a first groove and a first boss, so that the first driving structure can extend into the first actuated structure, thereby increasing the rotation angle of the rotating shaft. The first actuated structure can also limit and position the first driving structure to prevent shaking.

[0021] Furthermore, the baffle includes a plurality of parallel and spaced baffles, and the plurality of parallel and spaced baffles of the baffle move downward to isolate the moving contact and the static contact, which can cut the arc and have a better arc extinguishing effect. That is, the baffle not only blocks the rotating shaft to store energy of the contact spring when closing the switch, but also isolates the moving contact and the static contact when opening the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the circuit breaker of the utility model;

[0023] Figure 2 and Figure 3 This is a schematic diagram of the internal structure of the circuit breaker of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the circuit breaker after the internal rotating shaft and the moving contact are separated;

[0025] Figure 5 This is a schematic diagram of the structure of the rotating shaft in the circuit breaker of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the baffle in the circuit breaker of the utility model;

[0027] Figure 7 This is a structural diagram of the moving contact in the circuit breaker of the utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the utility model in which the rotating shaft and the moving contact are installed in one piece;

[0029] Figure 9 This is a structural diagram of the lower housing of the circuit breaker of the utility model;

[0030] Figure 10 This is a structural diagram of the circuit breaker of the utility model in the open state;

[0031] Figure 11 It is a structural diagram of the circuit breaker of the utility model during the transition from the open state to the closed state;

[0032] Figure 12 This is a structural diagram of the circuit breaker of the utility model in the closed state;

[0033] Reference numerals include:

[0034] Handle mechanism 1; operating mechanism 2; moving contact 3; contact spring 32; rotating shaft 5; static contact 4; baffle 6; first blocking portion 66; first driving structure 51; first driven structure 61; first inclined surface 52; second inclined surface 62; moving contact 31; static contact 41; upper shell 81; lower shell 82; fastening screw 85; partition 86; blocking plate 68; connecting portion 67; first connecting portion 33; second connecting portion 34; third connecting portion 35; elastic member 63; first mounting portion 64; abutment plate 65; trip button 7; wiring slot 83; pressing screw 84. DETAILED DESCRIPTION

[0035] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the present utility model. The protection scope of the present utility model is not limited to the description of the following embodiments.

[0036] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the circuit breaker includes a handle mechanism 1, an operating mechanism 2, a shell and several protection pole units arranged in the shell, wherein the protection pole unit is a phase pole unit or a neutral pole unit, each phase pole unit includes a moving contact, a static contact, an arc extinguishing mechanism and a protection mechanism, and the neutral pole unit usually includes a moving contact and a static contact, but no arc extinguishing mechanism and protection mechanism are provided. The moving contact 3 is mounted on the rotating shaft 5 through a contact spring 32, and the rotating shaft 5 of each protection pole unit is integral or fixedly connected. The operating mechanism 2 is connected to the rotating shaft 5, and the handle mechanism 1 is located on the operating surface of the circuit breaker for manually operating the circuit breaker to open and close. The handle mechanism 1 is connected to the operating mechanism 2, and the operating mechanism 2 is driven by the handle mechanism 1 to drive the rotating shaft 5 to rotate, thereby driving the moving contact 3 to rotate and close or disconnect with the static contact 4. The arc extinguishing mechanism is used to extinguish the arc between the moving contact 3 and the static contact 4. The protection mechanism triggers the tripping of the operating mechanism 2 when a fault occurs in the circuit of the corresponding phase pole unit, causing the operating mechanism 2 to drive the moving contact 3 and the static contact 4 to disconnect. The protection mechanism includes an overload protection mechanism and / or a short-circuit protection mechanism. The overload protection mechanism is typically a bimetallic strip for overload protection, and the short-circuit protection mechanism is an electromagnetic release for short-circuit protection. The protection mechanism can also be a thermal magnetic release that integrates overload and short-circuit protection. A circuit breaker typically includes at least one phase pole unit, with a neutral pole unit provided as needed. It should be noted that the neutral pole unit can also be provided with an arc extinguishing mechanism and a protection mechanism like the phase pole unit. In addition, the neutral pole unit can also be provided with a directly connected terminal block instead of the moving contact 3 and the static contact 4, and it is also possible to connect the incoming and outgoing terminals. This is the prior art in this field.

[0037] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, an improvement of the present application is that the circuit breaker further includes a baffle 6, which is located on the path of the moving contact 3 rotating in the closing direction. When the operating mechanism 2 drives the rotating shaft 5 to drive the moving contact 3 to rotate in the closing direction, the baffle 6 blocks the rotation of the moving contact 3, and the rotating shaft 5 continues to rotate to compress the contact spring 32, so that the rotating shaft 5 contacts the baffle 6 and drives the baffle 6 to move, thereby releasing the limit of the baffle 6 on the moving contact 3, so that the contact spring 32 releases energy to drive the moving contact 3 to rotate rapidly and close with the static contact 4.

[0038] A contact spring 32 is provided between the moving contact 3 and the rotating shaft 5. The moving contact 3 is mounted on the rotating shaft 5 through the contact spring 32. The contact spring 32 can play an overtravel role. In this embodiment, the contact spring 32, the rotating shaft 5, the moving contact 3 and the baffle 6 also constitute a closing energy storage mechanism, which can accelerate the closing of the moving contact 3 and the static contact 4.

[0039] When closing the circuit, when the moving contact 3 is limited by the baffle 6 and the shaft 5 continues to rotate, the shaft 5 compresses the contact spring 32, so that the contact spring 32 completes energy storage, and then the rotation of the shaft 5 drives the baffle 6 to move upward along the height direction of the circuit breaker, so that the baffle 6 releases the limit on the moving contact 3, and the contact spring 32 instantly releases energy to quickly close the moving contact 3 and the static contact 4, shortening the closing time and reducing the damage of the arc. The present application sets a baffle 6 on the side of the shaft 5 close to the static contact 4. The baffle 6 is used to limit the closing of the moving contact 3. The shaft 5 rotates to drive the baffle 6 to move upward along the height direction of the circuit breaker, releasing the limit of the baffle 6 on the moving contact 3. The connection structure between the moving contact, the shaft and the baffle of the present application is simple. Among them, Figure 8 Schematic diagram of the structure after the moving contact 3, contact spring 32 and rotating shaft 5 are installed. For the convenience of explanation, the height direction of the circuit breaker is defined as the first direction, that is, Figure 1 The up and down directions in .

[0040] In this embodiment, the baffle 6 is used to directly block the moving contact 3. The baffle 6 is driven by the rotating shaft 5 to release its blockage of the moving contact 3. The closing energy storage mechanism can be realized by using the existing contact spring 32. There is no need to change the layout of the existing circuit breaker. Only the baffle 6 needs to be added. The overall structure is simple.

[0041] Preferably, Figure 5 It shows the structural diagram of the rotating shaft 5 of the present application, Figure 6 The schematic diagram of the structure of the baffle 6 of the present application is shown in FIG. Figure 5 and Figure 6As shown, the rotating shaft 5 includes at least one first driving structure 51, and the baffle 6 includes at least one first driven structure 61 and at least one first blocking portion 66 for blocking the moving contact 3. At least one first driving structure 51 cooperates with at least one first driven structure 61 to enable the rotating shaft 5 to drive the baffle 6 to move upward in the first direction.

[0042] Preferably, the first driving structure 51 is a first boss, the rotating shaft 5 protrudes downward and is provided with a first driving arm, the first driving arm extends toward the direction of the baffle 6 and is provided with a first boss, the first boss is provided with a first inclined surface 52, and an avoidance space is formed above the first boss; the first driven structure 61 is a first hole, the upper side of the first hole is provided with a second inclined surface 62 that fits with the first inclined surface 52, the first blocking portion 66 is provided below the first hole, the first inclined surface 52 cooperates with the second inclined surface 62, so that the rotating shaft 5 drives the baffle 6 to move upward along the first direction, and when the moving contact 3 and the static contact 4 are closed, the first boss is inserted into the first hole.

[0043] By setting the first driving structure 51 and the first driven structure 61 to cooperate with the first groove and the first boss, the first driving structure 51 can be extended into the first driven structure 61, so that the rotation angle of the rotating shaft can be increased, and the first driven structure 61 can also limit and position the first driving structure 51 to prevent shaking.

[0044] Furthermore, in other possible implementation methods, the first driven structure 61 is a boss structure with the second inclined surface 62, and the first driving structure 51 is the first boss. Through the cooperation between the bosses, the purpose of driving the baffle to move upward by the rotating shaft can also be achieved, so that the baffle avoids the moving contact.

[0045] Furthermore, the first driving structure 51 can also be a hook, and the first driven structure 61 is a first groove or a first hole that cooperates with the hook. The hook can extend into the first groove or the first hole to pull the baffle 6 to move upward along the first direction.

[0046] Preferably, Figure 5 As shown, the first blocking portion 66 of the baffle 6 is a third boss, which is used to contact the moving contact 3 to block the movement of the moving contact 3. The third boss is provided at the lower end of the baffle 6 to shorten the contact distance between the moving contact 3 and the baffle 6. After the moving contact 3 and the baffle 6 make contact, the electrical gap between the moving contact 31 and the static contact 41 is increased, thereby preventing discharge between the moving contact 31 and the static contact 41 before closing. Of course, in other possible implementations, the lower end of the baffle 6 can also be provided with a groove-like structure, and the moving contact 3 partially snaps into the groove-like structure to prevent the moving contact 3 from shaking.

[0047] Preferably, a baffle limiting groove is provided in the shell, and the baffle 6 is placed in the baffle limiting groove to limit the movement of the baffle 6.

[0048] In particular, the circuit breaker of the present application is applied to a multi-pole circuit breaker, including multiple phase pole units for connecting a multi-pole circuit. The baffle 6 is driven by the rotating shaft 5 to release its obstruction to the moving contact 3, which can ensure the consistency of the rapid closing of multiple phase pole units. The multiple phase pole units of the circuit breaker are arranged side by side along the axial direction of the rotating shaft 5. The moving contacts 3 of the multiple phase pole units are all installed on one rotating shaft 5. An operating mechanism 2 is connected to the rotating shaft 5. A handle mechanism 1 is connected to the operating mechanism 2. A baffle 6 is provided with multiple first blocking portions 66 corresponding to the moving contacts 3 of the multiple phase pole units. The rotating shaft 5 is provided with multiple first drive structures 51 at intervals along the axial direction of the rotating shaft 5. The baffle 6 is correspondingly provided with multiple first passive structures 61 corresponding to the multiple first drive structures 51. The rotating shaft 5 is preferably integrally formed, or it can be formed by fixedly connecting multiple components. The baffle 6 is preferably integrally formed, or it can be formed by fixedly connecting multiple components. The circuit breaker of this embodiment is a four-pole circuit breaker, comprising a handle mechanism 1, an operating mechanism 2, three phase pole units and a neutral pole unit.

[0049] Figures 1-9 The schematic diagram of the structure of the circuit breaker is a four-pole circuit breaker, as shown in FIG. Figures 1-9 As shown, the four-pole circuit breaker of the present application includes three phase pole units and one neutral pole unit, which is used in a three-phase four-wire circuit. The three phase pole units are respectively connected to phase A, phase B and phase C, and one neutral pole unit is connected to phase N. Since phase N does not generate an arc, the neutral pole unit of the circuit breaker of the present application is not provided with an arc extinguishing mechanism and a protection mechanism.

[0050] Of course, the present application can also be used in a single-pole circuit, including a phase pole unit, which is connected in series in the circuit to conduct and disconnect the circuit. In other achievable embodiments, the circuit breaker of the present application can also be applied to a double-pole circuit breaker and a three-pole circuit breaker, wherein the difference between a three-pole circuit breaker and a four-pole circuit breaker is that a three-pole circuit breaker is used to disconnect a three-phase power supply and does not disconnect the neutral line, so it includes three phase pole units but does not include a neutral pole unit; the difference between a double-pole circuit breaker and a single-pole circuit breaker is that a double-pole circuit breaker can disconnect the neutral line, and the said circuit breaker includes a phase pole unit and a neutral pole unit.

[0051] It should be noted that a phase pole unit or a neutral pole unit of the circuit breaker corresponds to a first driving structure 51 and a first passive structure 61. Of course, the neutral pole unit may not be provided with the first driving structure 51 and the first passive structure 61. In the four-pole circuit breaker of the present application, the three phase pole units are provided with the first driving structure 51 and the first passive structure 61, and one neutral pole unit is not provided with the first driving structure 51 and the first passive structure 61.

[0052] Preferably, Figure 1 、 Figure 2 and Figure 9 As shown, the housing includes an upper housing 81 and a lower housing 82, the upper housing 81 and the lower housing 82 are closed along a first direction, and the baffle 6 is slidably arranged along the first direction. Figure 9 Schematic diagram of the structure of the lower shell 82.

[0053] Furthermore, the upper housing 81 and the lower housing 82 can be mounted by snap fastening. Furthermore, the circuit breaker can further include a plurality of fastening screws 85, which fix the upper housing 81 and the lower housing 82 to be more firmly fixed.

[0054] Furthermore, the lower shell 82 is divided by a partition 86 to form a plurality of protective pole accommodating cavities for accommodating the plurality of phase pole units. The baffle 6 is a sheet-like structure located on the side of the rotating shaft 5 close to the static contact 4, including a plurality of baffle plates 68 arranged in parallel at intervals and a connecting portion 67. The connecting portion 67 connects the plurality of baffle plates 68 into one. The gap between adjacent baffle plates 68 is used to avoid the partition 86. The first passive structure 61 is arranged on the baffle plate 68.

[0055] like Figure 1-Figure 7 As shown, the moving contact 3 includes a first connection portion 33, a second connection portion 34, and a third connection portion 35 that are bent and connected in sequence, so that an escape area is formed between the first connection portion 33 and the second connection portion 34. When the moving contact 3 and the static contact 4 are closed, the rotating shaft 5 drives the baffle 6 to move, so that the first blocking portion 66 of the baffle 6 enters the escape area, and the baffle 6 releases the limit on the moving contact 3. When the moving contact 3 and the static contact 4 are disconnected, the first blocking portion 66 of the baffle 6 is located outside the escape area; the moving contact 31 is provided on the third connection portion 35 of the moving contact 3, and the static contact 4 is provided with a static contact 41 corresponding to the moving contact 31. Among them, Figure 7 It shows a structural schematic diagram of the moving contact 3 of the present application.

[0056] In a preferred embodiment, the first connecting portion 33 and the third connecting portion 35 are arranged relatively parallel to each other.

[0057] Furthermore, in a preferred embodiment, in the open state, the blocking plate of the baffle 6 extends between the moving contact 31 and the static contact 41, isolating the moving contact 31 from the static contact 41. When the circuit breaker is closed, the rotating shaft 5 drives the baffle 6 upward in a first direction, releasing the baffle 6 from limiting the moving contact 3. Simultaneously, the baffle 6 releases the isolation between the moving contact 31 and the static contact 41, moving out from between the moving contact 31 and the static contact 41, allowing the moving contact 31 and the static contact 41 to contact and close. When the circuit breaker is open, the baffle 6 moves downward, isolating the moving contact 31 and the static contact 41, thereby cutting the arc and achieving a better arc extinguishing effect. That is, the baffle 6 not only blocks the rotating shaft 5 during closing to allow the contact spring to store energy, but also isolates the moving contact 31 from the static contact 41 during opening.

[0058] Further, such as Figure 1 、 Figure 3 、 Figure 4 and Figure 7 As shown, in another possible implementation method, in the open state, the blocking plate of the baffle 6 is arranged above the moving contact 31 and the static contact 41, and does not extend between the moving contact 31 and the static contact 41 to isolate the moving contact 31 and the static contact 41, which also falls within the protection scope of the present utility model.

[0059] Preferably, an elastic member 63 is provided between the baffle 6 and the housing, and the elastic member 63 drives the baffle 6 to move downward in a first direction or in the direction of the lower housing 82, that is, the baffle 6 can move in a vertical direction or in an inclined direction toward the lower housing 82 to move to the path where the moving contact 3 rotates in the closing direction. When closing, the baffle 6 first blocks the moving contact 3 while the rotating shaft 5 continues to rotate to compress the contact spring 32. Then, the rotating shaft 5 drives the baffle 6 to move upward to release the limit on the moving contact 3. The contact spring 32 drives the moving contact 3 to rotate rapidly and close with the static contact 4. When opening, the operating mechanism drives the rotating shaft 5 to rotate, driving the moving contact 3 to rotate synchronously in the opening direction. Under the action of the elastic member 63, the baffle 6 moves downward and returns to the position that blocks the moving contact 3 from closing. The sheet-like structure of the baffle 6 saves space inside the circuit breaker.

[0060] Furthermore, the connecting portion 67 of the baffle 6 is provided with a first mounting portion 64 , the housing is provided with a second mounting portion corresponding to the first mounting portion 64 , and both ends of the elastic member 63 are fixedly mounted on the first mounting portion 64 and the second mounting portion respectively.

[0061] Furthermore, the first mounting portion 64 and the second mounting portion are in the same straight line along the first direction, the first mounting portion 64 and the second mounting portion are second bosses, the elastic member 63 is a compression spring, and the two ends of the compression spring are respectively mounted on the two second bosses, or, the first mounting portion 64 and the second mounting portion are second grooves, and the two ends of the elastic member 63 are respectively placed in the two second grooves, or, the first mounting portion 64 is a second boss or a second groove, and the second mounting portion is a second groove or a second boss, wherein the elastic member 63 can also be a spring, an elastic rubber rod or an elastic sheet.

[0062] In the embodiment of the present application, two second bosses are provided on the connecting portion 67 of the baffle 6, and two corresponding second grooves are provided on the housing. A stop plate 65 (such as Figure 4 shown).

[0063] Preferably, the circuit breaker is a residual current circuit breaker, and a zero-sequence current transformer, a leakage release and a leakage detection circuit are also provided in the shell. The loop of each phase pole unit passes through the zero-sequence current transformer, and the leakage detection circuit is connected to the zero-sequence current transformer for detecting residual current.

[0064] like Figure 1 and Figure 3 As shown, the protection mechanism includes a trip button 7 provided on the circuit breaker operation panel, and the trip button 7 is used for manually operating the circuit breaker to trip.

[0065] Preferably, the operating mechanism 2 is connected to a reset spring and a locking piece. After the handle mechanism 1 completes the closing through the operating mechanism 2, the operating mechanism 2 is limited by the locking piece, and the handle mechanism 1 and the operating mechanism 2 are locked in position. When opening, an external force pushes / pull the handle mechanism 1 to release the operating mechanism 2 from the limit of the locking piece. The handle mechanism 1 and the operating mechanism 2 are reset under the action of the reset spring. By setting the reset spring, the opening of the circuit breaker can be accelerated and the arcing can be quickly eliminated.

[0066] At the same time, the locking piece is connected to the protection mechanism. During the operation of the circuit breaker, when the current or voltage is too large, the protection mechanism drives the locking piece to operate, so that the operating mechanism 2 is emergency opened under the action of the reset spring (i.e., overload protection and / or short-circuit protection is achieved), which can improve the safety performance of the circuit breaker.

[0067] Further, such as Figure 3 As shown, the circuit breaker is provided with wiring slots 83 on the side of the moving contact 3 and the side of the static contact 4, respectively. The wiring slots 83 are provided with clamping screws 84. The external connecting wires extend into the wiring slots 83. The clamping screws 84 tighten the connecting wires in the wiring slots 83 downward along the first direction.

[0068] Furthermore, the housing includes a plurality of limiting structures. After the housing and the internal components of the circuit breaker are installed, the plurality of limiting structures in the housing lock and limit the internal components in the circuit breaker.

[0069] For ease of understanding, Figure 10 The figure shows the internal structure of the circuit breaker in the open state. Figure 11 The figure shows the internal structure of the circuit breaker of the present application moving from the open state to the closed state. Figure 12 The figure shows the internal structure of the circuit breaker in the closed state.

[0070] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0071] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a handle mechanism (1), an operating mechanism (2), a housing and at least one phase pole unit, wherein the phase pole unit comprises a moving contact (3) and a stationary contact (4), the moving contact (3) being mounted on a rotating shaft (5), a contact spring (32) being provided between the moving contact (3) and the rotating shaft (5), the handle mechanism (1) being connected to the operating mechanism (2), the operating mechanism (2) being connected to the rotating shaft (5), the handle mechanism (1) driving the operating mechanism (2) to drive the rotating shaft (5) to rotate, the rotating shaft (5) driving the moving contact (3) to rotate and close or open with the stationary contact (4), the handle mechanism (1), the operating mechanism (2) and the at least one phase pole unit being mounted in the housing, characterized in that The invention also includes a baffle (6), which is located on the path of the moving contact (3) rotating in the closing direction. When the operating mechanism (2) drives the rotating shaft (5) to drive the moving contact (3) to rotate in the closing direction, the baffle (6) blocks the moving contact (3) from rotating. The rotating shaft (5) continues to rotate to compress the contact spring (32), so that the rotating shaft (5) contacts the baffle (6), and drives the baffle (6) to move to release the baffle (6) from limiting the moving contact (3), so that the contact spring (32) releases energy to drive the moving contact (3) to rotate quickly and close with the static contact (4).

2. The circuit breaker according to claim 1, wherein: The rotating shaft (5) includes at least one first driving structure (51), and the baffle (6) includes at least one first driven structure (61) and at least one first blocking portion (66) for blocking the moving contact (3). At least one first driving structure (51) cooperates with at least one first driven structure (61) to enable the rotating shaft (5) to drive the baffle (6) to move.

3. The circuit breaker according to claim 2, wherein: The invention comprises a plurality of phase pole units, wherein the plurality of phase pole units are arranged side by side along the axial direction of a rotating shaft (5), the movable contacts (3) of the plurality of phase pole units are all mounted on a rotating shaft (5), an operating mechanism (2) is connected to the rotating shaft (5), a handle mechanism (1) is connected to the operating mechanism (2), a baffle (6) is provided with a plurality of first blocking portions (66) respectively used for blocking the movable contacts (3) of the plurality of phase pole units, the rotating shaft (5) is provided with a plurality of first drive structures (51) arranged at intervals along the axial direction of the rotating shaft (5) corresponding to the plurality of phase pole units, and the baffle (6) is provided with a plurality of first driven structures (61) corresponding one-to-one to the plurality of first drive structures (51).

4. The circuit breaker according to claim 2 or 3, characterized in that: The first driving structure (51) is a first boss, and the first driven structure (61) is a first groove or a first hole that cooperates with the first boss; a first inclined surface (52) is provided on the first boss, and a second inclined surface (62) that fits with the first inclined surface (52) is provided in the first groove or the first hole, and the first inclined surface (52) cooperates with the second inclined surface (62) so that the rotating shaft (5) drives the baffle (6) to move upward along the first direction.

5. The circuit breaker according to claim 2, wherein: The housing comprises an upper housing (81) and a lower housing (82); the upper housing (81) and the lower housing (82) are closed along a first direction; and the baffle (6) is slidably arranged along the first direction.

6. The circuit breaker according to claim 5, characterized in that The lower shell (82) is divided by a partition (86) to form a plurality of protective pole accommodating cavities for accommodating the plurality of phase pole units. The baffle (6) includes a plurality of baffles (68) arranged in parallel at intervals and a connecting portion (67). The connecting portion (67) connects the plurality of baffles (68) into one. The gaps between adjacent baffles (68) are used to avoid the partition (86). The first actuated structure (61) is arranged on the baffle (68).

7. The circuit breaker according to claim 2, 3 or 6, characterized in that: The first driving structure (51) is a first boss, the rotating shaft (5) protrudes downward and is provided with a first driving arm, the first driving arm extends in the direction of the baffle (6) and is provided with a first boss, a first inclined surface (52) is provided on the first boss, and an escape space is formed above the first boss; the first driven structure (61) is a first hole, the upper side of the first hole is provided with a second inclined surface (62) that is in contact with the first inclined surface (52), the first blocking portion (66) is provided below the first hole, the first inclined surface (52) cooperates with the second inclined surface (62), so that the rotating shaft (5) drives the baffle (6) to move upward, and when the moving contact (3) and the static contact (4) are closed, the first boss is inserted into the first hole.

8. The circuit breaker according to claim 6, wherein: The moving contact (3) comprises a first connecting portion (33), a second connecting portion (34) and a third connecting portion (35) which are bent and connected in sequence, so that an escape area is formed between the first connecting portion (33) and the second connecting portion (34); when the moving contact (3) and the static contact (4) are closed, the first blocking portion (66) of the baffle (6) is located inside the escape area; when the moving contact (3) and the static contact (4) are disconnected, the first blocking portion (66) of the baffle (6) is located outside the escape area; a moving contact point (31) is provided on the third connecting portion (35) of the moving contact (3), and a static contact point (41) corresponding to the moving contact point (31) is provided on the static contact (4).

9. The circuit breaker according to claim 8, characterized in that When the moving contact (3) and the stationary contact (4) are disconnected, the blocking plate of the baffle (6) is located between the moving contact (31) and the stationary contact (41), isolating the moving contact (31) and the stationary contact (41); when the moving contact (3) and the stationary contact (4) are closed, the blocking plate of the baffle (6) releases the isolation between the moving contact (31) and the stationary contact (41).

10. The circuit breaker according to claim 5, characterized in that An elastic member (63) is provided between the baffle (6) and the housing, and the elastic member (63) drives the baffle (6) to move downward in a first direction or toward the lower housing (82).

11. The circuit breaker according to claim 10, characterized in that The connecting portion (67) of the baffle (6) is provided with a first mounting portion (64), the housing is provided with a second mounting portion corresponding to the first mounting portion (64), and both ends of the elastic member (63) are fixedly mounted on the first mounting portion (64) and the second mounting portion, respectively.

12. The circuit breaker according to claim 1, wherein: The circuit breaker is a residual current circuit breaker, and a zero-sequence current transformer, a leakage release and a leakage detection circuit are also provided in the shell. The loop of each phase pole unit passes through the zero-sequence current transformer, and the leakage detection circuit is connected to the zero-sequence current transformer for detecting residual current.

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