Control and protection switchgear

Abstract

The utility model relates to a kind of control and protection switchgear, including attraction electromagnet, operating mechanism, pressure plate and conducting system, and the conducting system includes contact system and transient electromagnet, its main improvement is that locking mechanism is additionally arranged by lock rod and locking spring, when short-circuit current flows through transient electromagnet, transient moving iron core triggers operating mechanism to trip and drives lever to act, makes movable contact bridge and static contact fast separation;Simultaneously, lock rod moves to locking position under the action of locking spring, prevents lever to back off, effectively prevent movable contact bridge rebound causes arc reignition and contact burning loss;Subsequently, attraction electromagnet is powered off, pressure plate presses down contact support to realize complete breaking, and synchronously push lock rod reset, solve the problem that traditional locking mechanism is large in size, reset slow, improve safety and service life.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a control and protection switching device. Background Technology

[0002] Control and protection switching devices (CPS) are switching devices that integrate multiple functions such as circuit breakers and contactors. Due to their well-coordinated control and protection characteristics, they are increasingly widely used in low-voltage power distribution systems. When a short-circuit current occurs in the line, on the one hand, the huge current passing through the instantaneous electromagnet coil generates a strong magnetic field, driving its internal moving iron core to move, directly or indirectly striking the moving contact bridge. This causes the moving and stationary contacts to quickly separate under the combined action of electric repulsion, achieving rapid disconnection. On the other hand, the instantaneous electromagnet's action synchronously triggers the operating mechanism to trip, thereby cutting off the power supply circuit to the electromagnet coil and completely breaking the moving contact bridge.

[0003] However, after the moving contact bridge breaks quickly, it may spring back during the waiting period before complete disconnection, leading to arc reignition and contact erosion. Therefore, control and protection switchgear usually includes a locking mechanism to prevent the moving contact bridge from springing back, but existing locking mechanisms have problems such as slow locking, large size, and slow reset. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a control and protection switch.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A control and protection switching device includes an electromagnet, an operating mechanism, a pressure plate, and at least one conductive system, wherein the electromagnet is linked to the pressure plate, and the pressure plate is connected to a pressure plate spring.

[0007] The conductive system includes:

[0008] The contact system includes a moving contact bridge and two stationary contacts respectively disposed at both ends of the moving contact bridge. The moving contact bridge is connected to a contact support and a contact spring. When the electromagnet is energized, it drives the pressure plate away from the contact support, so that the moving contact bridge contacts the stationary contacts under the action of the contact spring. When the electromagnet is de-energized, it releases the pressure plate, and the pressure plate spring drives the pressure plate to press down on the contact support, causing the moving contact bridge to overcome the action of the contact spring and separate from the stationary contacts.

[0009] An instantaneous electromagnet includes an instantaneous coil, an instantaneous moving iron core, and a lever, the lever being movable between a first position and a second position;

[0010] It also includes a locking mechanism, which includes a locking rod and a locking spring, the locking rod having a locking part and a reset part, and the locking rod being movable between a locked position and an unlocked position;

[0011] When a short-circuit current flows through the instantaneous coil, the instantaneous moving iron core triggers the operating mechanism to trip, causing the operating mechanism to disconnect the power supply circuit of the coil. At the same time, the instantaneous moving iron core drives the lever to move from the first position to the second position, causing the lever to push the contact support and causing the moving contact bridge to separate from the stationary contact. When the lever moves from the first position to the second position, the locking rod moves to the locking position under the drive of the locking spring, and prevents the lever from returning to the first position through the locking part, thereby preventing the moving contact bridge from rebounding.

[0012] Then the electromagnet is de-energized and the pressure plate is released. The pressure plate spring drives the pressure plate to press down on the contact support. At the same time, the pressure plate pushes the reset part, driving the locking rod to return from the locked position to the unlocked position and release the lever.

[0013] Preferably, the reset part is disposed between the instantaneous electromagnet and the contact support, one end of the locking part is connected to the reset part, and the other end extends above the lever; when the locking rod moves to the locked position, the locking part moves between the lever and the instantaneous coil; when the locking rod moves to the unlocked position, the locking part moves away from the lever and the instantaneous coil.

[0014] Preferably, the pressure plate includes a contact pressing part for supporting the pressing contact, and a reset pressing part extending from the contact pressing part to the instantaneous electromagnet; when the locking rod is in the locked position, the reset pressing part can push the reset part during the pressing process.

[0015] Preferably, the reset part and the reset pressing part are respectively provided with inclined driving surfaces, and the reset pressing part pushes the reset part through the driving surfaces.

[0016] Preferably, the instantaneous electromagnet further includes an instantaneous housing, which has two opposing protruding structures, and a guide groove is formed between the two protruding structures, and the lever swings within the guide groove.

[0017] Preferably, one of the protruding structures has a groove, and the locking part is linearly slidably disposed in the groove; the other protruding structure has a limiting post; when the locking rod is in the locked position, the locking part extends out of the groove and contacts the limiting post.

[0018] Preferably, it also includes an insulating housing, which is integrally formed from a contact housing and a transient housing, and the contact housing is provided with a contact system and an arc-extinguishing grid.

[0019] The connection between the contact housing and the momentary housing forms an L-shaped mating space. The contact housing has a first through hole at the position corresponding to the mating space, and the contact support in the contact housing extends from the first through hole into the mating space. The momentary housing has a second through hole at the position corresponding to the mating space, and the lever in the momentary housing extends from the second through hole to above the first through hole in the mating space, so that it can be inserted into the contact support.

[0020] The reset part of the locking rod is located between the first through hole and the momentary housing, and the locking part is inserted into the momentary housing through the second through hole.

[0021] Preferably, the contact support is located in the middle of the contact housing, and two sets of grid assemblies are arranged on both sides of the contact support along the length of the housing. The moving contact bridge crosses the contact support, with its middle part fixed to the contact support and its two ends located between the contact support and the grid assemblies on both sides. The two stationary contacts are a first stationary contact and a second stationary contact, which are respectively installed on the top of the contact housing and respectively corresponding to the two ends of the moving contact bridge. The first stationary contact is connected to the terminal block, and the second stationary contact extends to the side of the instantaneous electromagnet and is connected to one end of the instantaneous coil. The other end of the instantaneous coil is connected to the terminal block after passing through a current transformer.

[0022] Preferably, the lever includes a lever pivot and a lever support respectively disposed at both ends, and a lever drive disposed between the two. The lever drive is connected to a lever return spring. The lever support is used to drive the touch bridge support to move downward. While the locking rod returns from the locked position to the unlocked position, the lever return spring drives the lever to move from the second position to the first position.

[0023] The instantaneous electromagnet is provided with a pressure rod connected to the instantaneous moving iron core. The pressure rod is used to push the lever drive part, so that the lever support part rotates around the lever pivot part and pushes the contact bridge support to move down. When the locking rod is in the locked position, its locking part is used to block the lever drive part and lock the lever in the second position.

[0024] Preferably, the attracting electromagnet includes an attracting coil, an attracting moving iron core, and an attracting micro switch. The attracting micro switch is used to control the on / off state of the power supply circuit of the attracting coil. The operating mechanism is disposed between the attracting electromagnet and the instantaneous electromagnet and is used to trigger the attracting micro switch.

[0025] The pressure plate is arranged between the attracting electromagnet and the instantaneous electromagnet, and is located between the operating mechanism and the contact support. The pressure plate is connected to the pressure plate spring.

[0026] The operating mechanism includes an energy storage spring, a push plate, a latch, a jump latch, and an unlocking component. The push plate of the operating mechanism is located on the side close to the electromagnet. The micro switch of the electromagnet extends to the top of the push plate. A knob is provided on the top of the operating mechanism.

[0027] Turn the knob in the closing direction. The knob drives the push plate through the latch and the jumper to trigger the micro switch, which in turn connects the power supply circuit of the coil and stores energy for the energy storage spring. When the coil is energized, the moving iron core is attracted, and the pressure plate linked with the moving iron core rotates and moves upward. The moving contact bridge contacts the stationary contact under the action of the contact spring.

[0028] Turn the knob in the direction of opening the circuit breaker. The knob drives the push plate through the latch and the trip latch to trigger the micro switch to open. This causes the micro switch to disconnect the power supply circuit of the coil. When the coil is de-energized, the moving iron core is released, which pushes the pressure plate to rotate and press down the contact support, thus separating the moving contact bridge from the stationary contact.

[0029] A push rod is provided above the operating mechanism. The push rod is rotatably connected to the housing. The two ends of the push rod are located above the operating mechanism and the instantaneous electromagnet, respectively. When the instantaneous moving iron core of the instantaneous electromagnet moves downward, it pulls the push rod to rotate clockwise. At the same time, the push rod triggers the locking and tripping of the operating mechanism, releasing the energy storage spring. The energy storage spring drives the push plate to move upward, triggering the micro switch to engage. The micro switch disconnects the power supply circuit of the electromagnet and releases the moving iron core. The pressure plate linked to the moving iron core rotates under the drive of the pressure plate spring and presses down the contact support to move downward, separating the moving contact bridge from the stationary contact.

[0030] Preferably, the pressure plate includes a pressure plate pivot portion rotatably connected to the housing, and a contact pressing portion for supporting the pressing contact. A reset pressing portion extends from the side of the contact pressing portion away from the pressure plate pivot portion. The pressure plate pivot portion is provided with a pressure plate driving portion extending laterally. The pressure plate driving portion is provided with a pressure plate driving groove. The attracting moving iron core of the attracting electromagnet is provided with an attracting driving shaft inserted into the pressure plate driving groove. A spring shaft is provided between the contact pressing portion and the pressure plate pivot portion. The pressure plate spring is connected between the spring shaft and the housing.

[0031] The locking mechanism for controlling and protecting switching electrical appliances in this embodiment represents a significant improvement over traditional locking mechanisms, specifically in the following aspects:

[0032] 1. After the instantaneous electromagnet is activated, the locking mechanism can immediately lock the lever in the second position, preventing the moving contact bridge from rebounding before the electromagnet is activated, thereby effectively preventing arc reignition and contact erosion.

[0033] 2. Traditional locking mechanisms require a relatively long upward extension to cooperate with the operating mechanism, which then drives the reset. In contrast, this embodiment utilizes a pressure plate closer to the lever to provide the driving force for the lock bar to reset, which can significantly reduce the size of the lock bar and facilitate the miniaturization and compact design of the overall structure.

[0034] 3. Traditional locking mechanisms rely on the operating mechanism for reset, resulting in late reset timing and slow speed. In contrast, in this solution, the locking rod is driven to reset by an electromagnet. When the pressure plate pushes the moving contact bridge to the fully disconnected position, the locking rod automatically completes the reset, eliminating the need to wait for the operating mechanism to perform re-locking or other actions before driving the locking rod to reset.

[0035] 4. The reset function is integrated into the existing pressure plate, which automatically drives the lock rod to reset through its inherent pressing action, without the need to set up a separate reset device for the lock rod or change the pressure plate structure.

[0036] Furthermore, this embodiment cleverly utilizes the inherent structural gap between the lever and the instantaneous coil, providing the necessary space for the movement of the locking part without increasing the volume of the instantaneous electromagnet.

[0037] Furthermore, in this embodiment, the reset part is placed in the narrow space between the instantaneous electromagnet and the support drive part, so that neither the reset part nor the locking part of the locking rod occupies additional space, making full use of the inherent structural gap between the existing core components without changing the layout of the existing core components.

[0038] Furthermore, by integrating the contact system, arc extinguishing system, instantaneous electromagnet, and locking mechanism into a single insulating housing, it not only features high integration and modularity but also isolates the high-voltage system within the insulating housing, thereby reducing the impact on external low-voltage systems. Attached Figure Description

[0039] Figure 1 It is a flowchart of the operation when a short circuit fault occurs in the control and protection switching electrical appliances;

[0040] Figure 2 This is a schematic diagram of the structure of the control and protection switching electrical appliances;

[0041] Figure 3 This is an exploded diagram of control and protection switching devices;

[0042] Figure 4 This is a structural diagram of one side of the locking bar;

[0043] Figure 5 This is a structural diagram of the other side of the locking bar.

[0044] Figure 6 It is the closing position when the two stationary contacts of the moving contact bridge are connected;

[0045] Figure 7 It is the rapid disconnection point of the moving contact bridge;

[0046] Figure 8 This is the position where the moving contact bridge is completely disconnected;

[0047] Figure 9 yes Figure 8 A magnified view of a portion of the image;

[0048] Figure 10 This is a schematic diagram of the insulating shell structure;

[0049] Figure 11 This is a cross-sectional view of the insulating shell;

[0050] The reference numerals in the attached drawings include: 1-Actuating electromagnet; 2-Pressure plate; 3-Operating mechanism; 4-Contact system; 5-Instantaneous electromagnet; 6-Locking rod; 7-Locking spring; 10-Switch housing; 11-Actuating coil; 12-Actuating moving iron core; 13-Actuating stationary iron core; 14-Actuating micro switch; 21-Pressure plate spring; 22-Contact pressing part; 23-Reset pressing part; 24-Drive surface; 25-Pressure plate pivot part; 26-Pressure plate drive part; 27-Pressure plate drive groove; 28-Spring shaft; 31-Push plate; 32-Push rod; 40-Conductive system; 41-Moving contact bridge; 42-Stationary contact; 43-Contact support; 44-Contact spring; 45-Grid assembly; 46-Contact housing; 47-Terminal; 48-Current transformer; 50-Instantaneous housing; 51-Instantaneous coil; 52-Instantaneous moving iron core; 53-Pressure rod; 54-Lever; 55-Lever return spring; 56-Coil frame; 57-Protruding structure; 58-Slide groove; 59-Limiting post; 61-Locking part; 62-Reset part; 421-First stationary contact; 422-Second stationary contact; 541-Lever pivot part; 542-Lever support part; 543-Lever drive part. Detailed Implementation

[0051] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0052] like Figure 1-8 As shown, the control and protection switchgear of this embodiment includes a switch housing 10 and an electromagnet 1, a pressure plate 2, an operating mechanism 3, and at least one conductive system 40 respectively disposed in the switch housing 10. The conductive system 40 includes:

[0053] The contact system 4 includes a moving contact bridge 41 and two stationary contacts 42 respectively provided at both ends of the moving contact bridge 41. The two sides of the middle part of the moving contact bridge 41 are connected to the contact support 43 and the contact spring 44 respectively. The contact spring 44 is used to drive the moving contact bridge 41 to approach the stationary contacts 42, so that the moving contact bridge 41 conducts the two stationary contacts 42 and conducts the main circuit to realize the closing. The contact support 43 is used to drive the moving contact bridge 41 to overcome the force of the contact spring 44 and move away from the stationary contacts 42, so that the moving contact bridge 41 separates from the stationary contacts 42 and disconnects the main circuit to realize the opening.

[0054] The arc extinguishing system includes two sets of grid plate assemblies 45 respectively arranged at both ends of the moving contact bridge 41. Each set of grid plate assemblies 45 includes a number of parallel and spaced arc extinguishing grid plates, which are used to cut and cool the electric arc generated by the contact system 4.

[0055] The instantaneous electromagnet 5 includes an instantaneous coil 51, an instantaneous moving iron core 52, a pressure rod 53, a lever 54, an iron core return spring, and a lever return spring 55. When the instantaneous coil 51 is subjected to a short-circuit current, the instantaneous coil 51 attracts the instantaneous moving iron core 52, which drives the pressure rod 53 to push the lever 54. The lever 54 pushes the contact bridge support 43, causing the moving contact bridge 41 to separate from the stationary contact 42. Subsequently, the lever return spring 55 drives the lever 54 to return to its original position, and the iron core return spring drives the instantaneous moving iron core 52 to return to its original position.

[0056] The electromagnet 1 includes an electromagnet 11, a moving iron core 12, a stationary iron core 13, and a micro switch 14. The moving iron core 12 is linked to the pressure plate 2, and the pressure plate 2 is connected to the pressure plate spring 21. The micro switch 14 is connected in series with the electromagnet 11 and is used to control the power supply circuit of the electromagnet 11. When the electromagnet 11 is energized, the moving iron core 12 and the stationary iron core 13 are attracted, which drives the pressure plate 2 to overcome the action of the pressure plate spring 21 and move away from the contact support 43. The contact spring 44 drives the moving contact bridge 41 to contact the corresponding stationary contact 42 at both ends. When the electromagnet 11 is de-energized, the pressure plate 2 is released. The pressure plate spring 21 drives the pressure plate 2 to push the contact bridge support 43 downward. The contact support 43 pushes the moving contact bridge to overcome the action of the contact spring 44 and separate from the stationary contact 42.

[0057] A knob is provided on the switch housing 10. The knob is connected to the operating mechanism 3. Rotating the knob triggers the micro switch 14 to conduct or disconnect the power supply circuit of the coil 11 through the operating mechanism 3. The moving contact bridge realizes manual closing and opening. The operating mechanism 3 includes an energy storage spring, a push plate 31, a latch, a jumper, and an unlocking component. When the moving contact bridge 41 contacts the stationary contact 42, the latch and the jumper can remain interlocked and lock the energy storage spring in the energy storage state.

[0058] A push rod 32 is provided above the operating mechanism 3. The unlocking component cooperates with the push rod 32. The push rod 32 is controlled by the instantaneous moving iron core 52. When the instantaneous coil 51 passes through a short-circuit current, the instantaneous moving iron core 52 drives the pressure rod 53 to push the lever 54, and at the same time drives the push rod 32 to push the unlocking component, so that the unlocking component drives the latch and the jump latch to unlock. At the same time, the energy storage spring is released. The energy storage spring releases energy to drive the push plate 31 to push the attracting micro switch 14, disconnecting the power supply circuit of the attracting coil 11.

[0059] The normal working process is as follows:

[0060] Closing process: When the latch and trip latch are interlocked, rotate the knob in the closing direction. The knob drives the push plate 31 through the latch and trip latch to trigger the micro switch 14, making the micro switch 14 conduct the power supply circuit of the coil 11 and store energy for the energy storage spring. When the coil 11 is energized, the moving iron core 12 is attracted. The pressure plate 2, which is linked to the moving iron core, rotates and moves upward. The moving contact bridge 41 contacts the stationary contact 42 under the action of the contact spring 44. The moving contact bridge 41 is located at ( Figure 6 The main circuit is connected when the switch is closed as shown in the diagram.

[0061] Opening process: When the latch and trip latch remain interlocked, rotate the knob in the opening direction. The knob drives the push plate 31 through the latch and trip latch to trigger the micro switch 14, causing the micro switch 14 to disconnect the power supply circuit of the coil 11. When the coil 11 is de-energized, the moving iron core 12 is released, and the pressure plate 2 linked with the moving iron core 12 loses its constraint. The pressure plate spring 21 drives the pressure plate 2 to rotate and press down the contact support 43, causing the moving contact bridge 41 to separate from the stationary contact 42. The moving contact bridge 41 is located at ( Figure 7 The circuit breaker is disconnected at the position shown in the diagram.

[0062] During normal operation, the instantaneous electromagnet 5 does not move, and its lever 54 is in the first position.

[0063] The short-circuit fault protection process is as follows:

[0064] Rapid disconnection process: When a short-circuit fault occurs, a huge short-circuit current flows through the instantaneous coil 51, generating a magnetic field that drives the instantaneous moving iron core 52 to move rapidly. The moving iron core pushes the lever 54 downward through the pressure rod 53. The lever 54 pushes the contact bridge support 43 downward against the action of the contact spring 44, causing the moving contact bridge 41 to move to the rapid disconnection position and separate from the stationary contact 42. At this time, as shown in the figure ( Figure 7 As shown in the figure, the distance between the moving contact bridge 41 and the stationary contact 42 is H1.

[0065] Complete disconnection process: Simultaneously, as the momentary moving iron core 52 moves downwards to push the lever 54, it also pulls the operating mechanism 3 via the push rod 32, causing the operating mechanism 3's latch to disengage from the lock and release the energy storage spring. The released energy storage spring drives the push plate 31 to trigger the microswitch 14, cutting off the power supply circuit to the coil 11 and releasing the moving iron core 12. The pressure plate spring 21 drives the pressure plate 2 to rotate and press down the contact support 43, causing the moving contact bridge 41 to continue moving downwards from the rapid disconnection position to the complete disconnection position, ensuring reliable arc extinguishing. At this point, if (… Figure 8 As shown in the figure, the distance between the moving contact bridge 41 and the stationary contact 42 is H2, and H2 is greater than H1.

[0066] The rapid breaking process achieved by the instantaneous electromagnet 5 is extremely fast, taking about 2-5 milliseconds, and can effectively limit the short-circuit current. However, the complete breaking process achieved by the attracting electromagnet 1 takes a little longer, about 20 milliseconds, which causes the moving contact bridge 41 to bounce back, resulting in problems such as arc reignition and contact erosion.

[0067] like Figure 4-8 As shown, one improvement of this embodiment is the addition of a locking mechanism. During the instantaneous operation of the electromagnet 5, the locking mechanism can lock the lever 54 immediately after the lever 54 is activated, and at the same time, the lever 54 blocks the contact support 43 to prevent the moving contact bridge 41 from rebounding.

[0068] Specifically, the locking mechanism includes a locking rod 6 and a locking spring 7 connected thereto. The locking rod 6 has a locking part 61 that cooperates with the lever 54 and a reset part 62 that cooperates with the pressure plate 2. The locking rod 6 can be in the locked position ( Figure 7 ) and unlock location ( Figure 6 The locking spring 7 moves between the unlocked and locked positions, and the locking lever 6 is used to drive the locking lever 6 from the unlocked position to the locked position.

[0069] The lever 54 can be in the first position ( Figure 6 ) and the second position ( Figure 7 The lever 54 moves between the two positions. When the lever 54 is in the first position, it can prevent the locking rod 6 from moving to the locked position. The locking rod 6 abuts against the side of the lever 54 under the action of the locking spring 7.

[0070] When a short-circuit current flows through the instantaneous coil 51, the instantaneous moving iron core 52 is driven to trigger the operating mechanism 3 to trip, causing the operating mechanism 3 to disconnect the power supply circuit of the coil 11. At the same time, the instantaneous moving iron core 52 drives the lever 54 to move from the first position to the second position, and the lever 54 drives the moving contact bridge 41 to the rapid disconnection position. Figure 7 The lever 54 pushes the contact support 43, causing the moving contact bridge 41 to separate from the stationary contact 42; at the same time, the lever 54 leaves room for the locking rod 6 to move. The locking rod 6 moves to the locking position under the action of the locking spring 7, and prevents the lever 54 from returning to the first position through the locking part 61, so as to prevent the moving contact bridge 41 from rebounding.

[0071] Subsequently, the electromagnet 1 is de-energized and the pressure plate 2 is released, driving the pressure plate 2 to push the moving contact bridge 41 to continue moving downward to the fully disconnected position. Figure 8Simultaneously, the pressure plate 2 pushes the reset part 62 of the locking rod 6, causing the locking rod 6 to return from the locked position to the unlocked position and releasing the lever 54. Under the action of the lever reset spring 55, the lever 54 resets from the second position to the first position. Subsequently, under the action of the pressure plate 2, the contact support 43 keeps the moving contact bridge 41 in the fully disconnected position. When the coil 11 is energized again, the pressure plate 2 moves upward away from the contact support 43. Since the locking mechanism has been reset, the contact spring 44 directly drives the moving contact bridge 41 to connect the stationary contact 42.

[0072] The locking mechanism of this embodiment represents a significant improvement over traditional locking mechanisms, specifically in the following aspects:

[0073] 1. After the instantaneous electromagnet 5 is activated, the locking mechanism can immediately lock the lever 54 in the second position, preventing the moving contact bridge 41 from rebounding before the electromagnet 1 is activated, thereby effectively preventing arc reignition and contact erosion.

[0074] 2. Traditional locking mechanisms require a relatively long upward extension to cooperate with the operating mechanism 3, and the operating mechanism 3 drives the reset. However, in this embodiment, the pressure plate 2, which is closer to the lever 54, provides the driving force for the lock rod 6 to reset, which can significantly reduce the volume of the lock rod 6 and is conducive to the miniaturization and compact design of the overall structure.

[0075] 3. Traditional locking mechanisms rely on the operating mechanism 3 for reset, which is late and slow. In this solution, the locking rod 6 is driven to reset by the attracting electromagnet 1. When the pressure plate 2 pushes the moving contact bridge 41 to the fully disconnected position, the locking rod 6 automatically completes the reset. There is no need to wait for the operating mechanism 3 to perform the re-locking action before driving the locking rod 6 to reset.

[0076] 4. The reset function is integrated into the existing pressure plate 2. It automatically drives the locking rod 6 to reset through its inherent pressing action, without the need to set up a separate reset device for the locking rod 6 or change the structure of the pressure plate 2.

[0077] like Figure 6 As shown, the instantaneous electromagnet 5 includes an instantaneous housing 50 and a coil frame 56 disposed in the instantaneous housing 50. The instantaneous coil 51 is disposed on the outside of the coil frame 56. The inner side of the coil frame 56 is provided with an instantaneous moving iron core 52 and a pressure rod 53 connected to each other. The end of the instantaneous moving iron core 52 away from the pressure rod 53 extends out of the coil frame 56 and cooperates with the push rod 32. When the instantaneous moving iron core 52 is driven by the instantaneous coil 51, it pushes the unlocking member through the push rod 32 to trigger the operating mechanism 3 to disengage. The end of the pressure rod 53 away from the instantaneous moving iron core 52 extends to the outside of the coil frame 56 and cooperates with the lever 54. Under the drive of the instantaneous moving iron core 52, it can push the lever 54 to rotate, so that the lever 54 pushes the contact bridge support 43 to move downward against the action of the contact spring 44.

[0078] The locking part 61 is located above the lever 54. When the locking rod 6 moves to the locked position, the locking part 61 moves between the lever 54 and the instantaneous coil 51. When the locking rod 6 moves to the unlocked position, the locking part 61 moves away from the lever 54 and the instantaneous coil 51.

[0079] This embodiment cleverly utilizes the inherent structural gap between the lever 54 and the instantaneous coil 51, providing the necessary space for the movement of the locking part 61 without increasing the volume of the instantaneous electromagnet 5.

[0080] like Figure 4-5 As shown, the locking rod 6 has an L-shaped structure, the reset part 62 is disposed between the instantaneous electromagnet 5 and the contact support 43, one end of the locking part 61 is connected to the reset part 62, the other end extends to the top of the lever 54, and is provided with a spring hole 63 sleeved on the locking spring 7;

[0081] The pressure plate 2 includes a contact pressing part 22 and a reset pressing part 23 extending from the contact pressing part 22 near the instantaneous electromagnet 5;

[0082] The contact pressing part 22 is disposed on the top side of the contact support 43 along the height direction of the housing, and is used to press down the contact support 43 to drive the contact bridge support 43 to move downward. When the locking rod 6 is in the locked position, the reset pressing part 23, which moves downward with the pressure plate 2, will push the reset part 62 of the locking rod 6, driving the locking rod 6 to reset to the unlocked position; if the locking rod 6 is already in the unlocked position, it will not contact the reset pressing part 23.

[0083] In this embodiment, the reset part 62 is placed in the narrow space between the instantaneous electromagnet 5 and the contact support 43, so that the reset part 62 and the locking part 61 of the L-shaped locking rod 6 do not occupy additional space, making full use of the inherent structural gap between the existing core components without changing the layout of the existing core components.

[0084] Preferably, the reset part 62 and the reset pressing part 23 are respectively provided with inclined driving surfaces 24. The force is transmitted between them through the driving surfaces 24, which can improve the transmission efficiency. The inclined surface driving design can efficiently convert the vertical downward pressure of the pressure plate 2 into the horizontal reset force of the locking rod 6, which not only reduces the risk of motion friction and jamming, but also improves the force transmission efficiency and the reliability of the reset action.

[0085] like Figure 7 As shown, the lever 54 includes a lever pivot part 541 and a lever support part 542 respectively disposed at both ends, and a lever drive part 543 disposed between the two.

[0086] The lever pivot 541 is rotatably mounted on the instantaneous housing 50. The lever drive 543 is connected to the lever return spring 55. The lever support 542 is used to drive the contact bridge support 43 to move down. At the same time as the locking rod 6 returns from the locked position to the unlocked position, the lever return spring 55 drives the lever 54 to move from the second position to the first position, so that the lever 54 automatically resets synchronously when the locking rod 6 resets, which greatly shortens the recovery time of the instantaneous electromagnet 5 after the action and significantly improves the response speed.

[0087] The pressure rod 53 is used to push the lever drive part 543, causing the lever support part 542 to rotate around the lever pivot part 541 and push the contact bridge support 43 to move downward;

[0088] When the locking lever 6 is in the locked position, its locking part 61 is used to block the lever drive part 543 and lock the lever 54 in the second position.

[0089] like Figure 11 As shown, the two side walls of the instantaneous housing 50 are provided with protruding structures 57 facing each other, and a guide groove is formed between the two protruding structures 57. When the lever drive part 543 rotates with the lever 54, it swings along the guide groove.

[0090] One of the protruding structures 57 has a slide groove 58, and the locking part 61 is linearly slidably disposed in the slide groove 58. The locking spring 7 is located at the bottom of the slide groove 58 and connected to the locking part 61. The other protruding structure 57 has a limiting groove opposite to the slide groove 58, and the bottom of the limiting groove has a limiting post 59 extending toward the slide groove 58.

[0091] When the locking lever 6 is in the unlocked position, the locking part 61 is located in the slide groove 58. The locking spring 7 drives the locking part 61 to abut against the side of the lever drive part 543 of the lever 54. When the lever 54 moves, it drives the lever drive part 543 to rotate downward, leaving space for the locking part 61 to move. The locking spring 7 drives the locking part 61 to move to the locked position.

[0092] When the locking lever 6 is in the locked position, the locking part 61 extends out of the slide groove 58 and contacts the limiting post 59, while preventing the lever 54 from returning to the first position. The side of the locking part 61 away from the limiting post 59 is located in the slide groove 58, preventing the locking part 61 from disengaging from the slide groove 58.

[0093] The protruding structure 57 can not only precisely guide the movement of the lever 54, but also precisely control the movement of the locking part 61. During short circuit protection, it can quickly and reliably lock the lever 54, and guide it to return to its correct position during reset, ensuring the reliability of the locking rod 6.

[0094] like Figure 10As shown, it also includes an insulating housing, which includes a contact housing 46 for accommodating the contact system 4 and the arc extinguishing system and the instantaneous housing 50. The instantaneous housing 50 is integrally formed with the contact housing 46, and the connection between the contact housing 46 and the instantaneous housing 50 forms an L-shaped mating space.

[0095] The contact housing 46 is provided with a first through hole 460 at the position corresponding to the mating space, and the contact support in the contact housing 46 extends from the first through hole 460 into the mating space;

[0096] The instantaneous housing 50 is provided with a second through hole 500 at the position corresponding to the mating space. The lever 54 in the instantaneous housing 50 extends from the second through hole 500 to above the first through hole 460 in the mating space, so that it can be inserted into the contact support 43.

[0097] The reset part 62 of the locking rod 6 is located between the first through hole 460 and the instantaneous housing 50, and the locking part 61 is inserted into the instantaneous housing 50 through the second through hole 500.

[0098] By integrating the contact system 4, arc extinguishing system, instantaneous electromagnet 5, and locking mechanism into an insulating housing, it not only features high integration and modularity but also isolates the high-voltage system inside the insulating housing, reducing the impact on external low-voltage systems.

[0099] like Figure 8-9 As shown, the operating mechanism 3 is disposed between the attracting electromagnet 1 and the instantaneous electromagnet 5. A current transformer 48 is provided on the side of the instantaneous electromagnet 5 away from the operating mechanism 3. The pressure plate 2 is arranged between the attracting electromagnet 1 and the instantaneous electromagnet 5 and is located between the operating mechanism 3 and the contact support 43. The pressure plate 2 includes a pressure plate pivot part 25 rotatably connected to the housing and a contact pressing part 22 for pressing down the contact support 43. A reset pressing part 23 extends on the side of the contact pressing part 22 away from the pressure plate pivot part 25.

[0100] The pressure plate pivoting part 25 is provided with a pressure plate driving part 26 extending to the side. The pressure plate driving part 26 is provided with a pressure plate driving groove 27. The attracting moving iron core 12 of the attracting electromagnet 1 is provided with an attracting driving shaft inserted into the pressure plate driving groove 27. A spring shaft 28 is provided between the contact pressing part 22 and the pressure plate pivoting part 25. The pressure plate spring 21 is connected between the spring shaft 28 and the housing.

[0101] When the coil 11 is energized, the stationary iron core 13 and the moving iron core 12 are attracted together. The moving iron core 12 moves to the left and pushes the side wall of the pressure plate drive groove 27 through the attraction drive shaft, so that the pressure plate 2 rotates counterclockwise around the pressure plate pivot 25. At the same time, the contact pressing part 22 moves away from the contact support 43, and the moving contact bridge 41 conducts the corresponding two stationary contacts 42 under the drive of the contact spring 44.

[0102] When the coil 11 is de-energized, the moving iron core 12 is released, and the pressure plate 2 rotates clockwise under the drive of the pressure plate spring 21. At the same time, the contact pressing part 22 presses down the contact support 43, causing the moving contact bridge 41 to separate from the stationary contact 42. If the locking rod 6 is in the locked position at the same time, the reset pressing part 23 pushes the reset part 62, so that the locking rod 6 returns from the locked position to the unlocked position.

[0103] The push plate 31 of the operating mechanism 3 is located on the side close to the electromagnet 1. The micro switch 14 of the electromagnet 1 extends above the push plate 31. A knob is provided above the operating mechanism 3. The push rod 32 is rotatably connected to the housing. Its two ends are located above the operating mechanism 3 and the instantaneous electromagnet 5, respectively. When the instantaneous moving iron core 52 of the instantaneous electromagnet 5 moves down, it pulls the push rod 32 to rotate clockwise. At the same time, the push rod 32 triggers the operating mechanism 3 to disengage. The operating mechanism 3 drives the push plate 31 to move upward and trigger the micro switch 14 to disconnect the power supply circuit of the electromagnet 1.

[0104] The contact support 43 is located in the middle of the contact housing 46. Two sets of grid assemblies 45 are arranged on both sides of the contact support 43 along the length of the housing. The moving contact bridge 41 crosses the contact support 43, with its middle part fixed to the contact support 43 and its two ends located between the contact support 43 and the grid assemblies 45 on both sides. The two stationary contacts 42 are the first stationary contact 421 and the second stationary contact 422, which are respectively installed on the top of the contact housing 46 and respectively corresponding to the two ends of the moving contact bridge 41. The first stationary contact 421 is connected to the terminal 47 at one end, and the second stationary contact 422 extends to the side of the instantaneous electromagnet 5 and is connected to one end of the instantaneous coil 51. The other end of the instantaneous coil 51 is connected to the terminal 47 at the other end after passing through a current transformer.

[0105] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0106] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A control and protection switch electrical appliance, comprising an electromagnet (1), an operating mechanism (3), a pressure plate (2) and at least one conductive system (40), wherein the electromagnet (1) is linked with the pressure plate (2) and the pressure plate (2) is connected to a pressure plate spring (21); The conductive system (40) includes: The contact system (4) includes a moving contact bridge (41) and two stationary contacts (42) respectively provided at both ends of the moving contact bridge (41). The moving contact bridge (41) is connected to the contact support (43) and the contact spring (44) respectively. When the electromagnet (1) is energized, it drives the pressure plate (2) away from the contact support (43), so that the moving contact bridge (41) contacts the stationary contact (42) under the action of the contact spring (44). When the electromagnet (1) is de-energized, it releases the pressure plate, and the pressure plate (2) is driven by the pressure plate spring (21) to press down the contact support (43), so that the moving contact bridge (41) overcomes the action of the contact spring (44) and separates from the stationary contact (42). A momentary electromagnet (5) includes a momentary coil (51), a momentary moving iron core (52), and a lever (54) that is movable between a first position and a second position; The feature is that it further includes a locking mechanism, which includes a locking rod (6) and a locking spring (7), the locking rod (6) having a locking part (61) and a reset part (62), the locking rod (6) being movable between a locked position and an unlocked position; When a short-circuit current flows through the instantaneous coil (51), the instantaneous moving iron core (52) is driven to trigger the operating mechanism (3) to trip, causing the operating mechanism (3) to disconnect the power supply circuit of the coil (11). At the same time, the instantaneous moving iron core (52) drives the lever (54) to move from the first position to the second position, causing the lever (54) to push the contact support (43), causing the moving contact bridge (41) to separate from the stationary contact (42). When the lever (54) moves from the first position to the second position, the locking rod (6) moves to the locking position under the drive of the locking spring (7), and prevents the lever (54) from returning to the first position through the locking part (61), so as to prevent the moving contact bridge (41) from rebounding. Then the electromagnet (1) is de-energized and the pressure plate (2) is released. The pressure plate spring (21) drives the pressure plate (2) to press down the contact support (43). At the same time, the pressure plate (2) pushes the reset part (62), driving the locking rod (6) to return from the locked position to the unlocked position and release the lever (54).

2. The control and protection switchgear according to claim 1, characterized in that: The reset part (62) is disposed between the instantaneous electromagnet (5) and the contact support (43). One end of the locking part (61) is connected to the reset part (62), and the other end extends above the lever (54). When the locking rod (6) moves to the locked position, the locking part (61) moves between the lever (54) and the instantaneous coil (51). When the locking rod (6) moves to the unlocked position, the locking part (61) leaves the space between the lever (54) and the instantaneous coil (51).

3. The control and protection switchgear according to claim 2, characterized in that: The pressure plate (2) includes a contact pressing part (22) for pressing down the contact support (43) and a reset pressing part (23) extending from the contact pressing part (22) to the instantaneous electromagnet (5); when the locking rod (6) is in the locked position, the reset pressing part (23) can push the reset part (62) during the pressing process.

4. The control and protection switchgear according to claim 3, characterized in that: The reset part (62) and the reset pressing part (23) are respectively provided with inclined driving surfaces (24), and the reset pressing part (23) pushes the reset part (62) through the driving surfaces (24).

5. The control and protection switching device according to claim 1, characterized in that: The instantaneous electromagnet (5) also includes an instantaneous housing (50), which has two opposing protruding structures (57) and a guide groove is formed between the two protruding structures (57). The lever (54) swings within the guide groove.

6. The control and protection switching device according to claim 5, characterized in that: One of the protruding structures (57) is provided with a groove (58), and the locking part (61) is linearly slidably disposed in the groove (58); the other protruding structure (57) is provided with a limiting post (59); when the locking rod (6) is in the locked position, the locking part (61) extends out of the groove (58) and contacts the limiting post (59).

7. The control and protection switching device according to claim 6, characterized in that: It also includes an insulating housing, which is integrally formed from a contact housing (46) and a momentary housing (50). The contact housing (46) is provided with a contact system (4) and an arc-extinguishing grid. The connection between the contact housing (46) and the momentary housing (50) forms an L-shaped mating space. The contact housing (46) is provided with a first through hole (460) at the position corresponding to the mating space. The contact support in the contact housing (46) extends from the first through hole (460) into the mating space. The instantaneous housing (50) is provided with a second through hole (500) at the position corresponding to the mating space. The lever (54) in the instantaneous housing (50) extends from the second through hole (500) to the top of the first through hole (460) in the mating space, so that it can be inserted into the contact support (43). The reset part (62) of the locking rod (6) is located between the first through hole (460) and the momentary housing (50), and the locking part (61) is inserted into the momentary housing (50) from the second through hole (500).

8. The control and protection switchgear according to claim 7, characterized in that: The contact support (43) is located in the middle of the contact housing (46). Two sets of grid assemblies (45) are arranged on both sides of the contact support (43) along the length of the housing. The moving contact bridge (41) crosses the contact support (43), with its middle part fixed on the contact support (43) and its two ends located between the contact support (43) and the grid assemblies (45) on both sides. The two stationary contacts (42) are the first stationary contact (421) and the second stationary contact (422), respectively. They are installed on the top of the contact housing (46) and are respectively set at the two ends of the moving contact bridge (41). The first stationary contact (421) is connected to the terminal (47). The second stationary contact (422) extends to the side of the instantaneous electromagnet (5) and is connected to one end of the instantaneous coil (51). The other end of the instantaneous coil (51) is connected to the terminal (47) after passing through the current transformer (48).

9. The control and protection switching device according to claim 1, characterized in that: The lever (54) includes a lever pivot (541) and a lever support (542) respectively disposed at both ends, and a lever drive (543) disposed between the two. The lever drive (543) is connected to the lever return spring (55). The lever support (542) is used to drive the touch bridge support (43) to move down. While the locking rod (6) returns from the locked position to the unlocked position, the lever return spring (55) drives the lever (54) to move from the second position to the first position. The instantaneous electromagnet (5) is provided with a pressure rod (53) connected to the instantaneous moving iron core (52). The pressure rod (53) is used to push the lever drive part (543) so that the lever support part (542) rotates around the lever pivot part (541) and pushes the touch bridge support (43) down. When the locking rod (6) is in the locked position, its locking part (61) is used to block the lever drive part (543) and lock the lever (54) in the second position.

10. The control and protection switching device according to claim 1, characterized in that: The electromagnet (1) includes an electromagnet (11), an electromagnet (12), and an electromagnet (14). The electromagnet (14) is used to control the power supply circuit of the electromagnet (11). The operating mechanism (3) is located between the electromagnet (1) and the instantaneous electromagnet (5) and is used to trigger the electromagnet (14). The pressure plate (2) is arranged between the attracting electromagnet (1) and the instantaneous electromagnet (5), and is located between the operating mechanism (3) and the contact support (43); The operating mechanism (3) includes an energy storage spring, a push plate (31), a latch, a jump latch, and an unlocking component. The push plate (31) of the operating mechanism (3) is located on the side close to the electromagnet (1). The micro switch (14) of the electromagnet (1) extends above the push plate (31). A knob is provided above the operating mechanism (3). Turn the knob in the closing direction. The knob drives the push plate (31) through the latch and the jumper to trigger the micro switch (14) to close. This causes the micro switch (14) to open the power supply circuit of the coil (11) and store energy for the energy storage spring. When the coil (11) is energized, the moving iron core (12) is closed. The pressure plate (2) linked with the moving iron core rotates and moves upward. The moving contact bridge (41) contacts the stationary contact (42) under the action of the contact spring (44). Turn the knob in the direction of opening the circuit breaker. The knob drives the push plate (31) through the latch and the jumper to trigger the micro switch (14) to open the power supply circuit of the coil (11). When the coil (11) is de-energized, the moving iron core (12) is released. The pressure plate (2) is driven to rotate by the pressure plate spring (21) and press down the contact support (43) to separate the moving contact bridge (41) from the stationary contact (42). A push rod (32) is provided above the operating mechanism (3). The push rod (32) is rotatably connected to the housing. The two ends of the push rod (32) are located above the operating mechanism (3) and the instantaneous electromagnet (5), respectively. When the instantaneous moving iron core (52) of the instantaneous electromagnet (5) moves down, it pulls the push rod (32) to rotate clockwise. At the same time, the push rod (32) triggers the locking and tripping of the operating mechanism (3) to release the energy storage spring and drive the push plate (31) to move upward through the energy storage spring to trigger the micro switch (14) to engage. The micro switch (14) disconnects the power supply circuit of the electromagnet (1) and releases the moving iron core (12). The pressure plate (2) is driven to rotate by the pressure plate spring (21) and the contact support (43) moves down, so that the moving contact bridge (41) separates from the stationary contact (42).

11. The control and protection switching device according to claim 10, characterized in that: The pressure plate (2) includes a pressure plate pivot (25) rotatably connected to the housing, and a contact pressing part (22) for pressing down the contact support (43). A reset pressing part (23) extends from the side of the contact pressing part (22) away from the pressure plate pivot (25). The pressure plate pivot (25) is provided with a pressure plate driving part (26) extending to the side. The pressure plate driving part (26) is provided with a pressure plate driving groove (27). The attracting moving iron core (12) of the attracting electromagnet (1) is provided with an attracting driving shaft inserted into the pressure plate driving groove (27). A spring shaft (28) is provided between the contact pressing part (22) and the pressure plate pivot (25). The pressure plate spring (21) is connected between the spring shaft (28) and the housing.

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