CN114678239B - A moving side contact assembly of a DC circuit breaker and a DC circuit breaker - Google Patents

Abstract

The invention relates to the technical field of direct current circuit breakers, in particular to a movable side arc striking structure of a direct current circuit breaker, and provides a movable side contact assembly of the direct current circuit breaker and the direct current circuit breaker. The moving side contact assembly of the direct current breaker comprises a moving main contact and a moving arc contact, wherein the moving arc contact is hinged to one end of the moving main contact, which is used for contacting with a fixed contact of the direct current breaker, and a conductive connection structure for bearing arc striking current is arranged between the moving side contact and the moving main contact; the movable arc contact is provided with an arc striking contact corresponding to a movable side arc striking inclined plane of the direct current breaker when the switch is opened so as to transfer the electric arc to the movable side arc striking inclined plane, an elastic piece for driving the movable arc contact to swing towards a fixed contact of the direct current breaker is arranged between the movable main contact and the movable arc contact, and the movable arc contact is further provided with a front swing limiting structure for limiting the swing angle of the movable arc contact towards the fixed contact of the direct current breaker.

Description

A moving side contact assembly of a DC circuit breaker and a DC circuit breaker

Technical field

The invention relates to the technical field of DC circuit breakers, and in particular to the dynamic side arc striking structure of the DC circuit breaker.

Background technique

The mainstream arc extinguishing chamber of the 1800V DC circuit breaker is a single main contact structure. For example, the circuit breaker introduced in the patent document CN110504117 B of the prior art includes a movable contact arranged on the main body of the circuit breaker. There is a movable contact located above the movable contact. There is a front arc row, which is used to guide the arc on the movable contact to the arc extinguishing structure located above the circuit breaker body. Since a large amount of arcs will be generated when the moving contacts and static contacts are closed, the arcs will ablate the moving contacts. In the long run, the damage to the moving contacts will be serious, which will reduce the current flow capacity of the static contacts. In order to improve the ablation resistance of the main contact, silver-oxide (generally silver-cadmium oxide) with strong ablation resistance is usually used as the main contact material, and silver-oxide is an unenvironmentally friendly material. Contrary to the growing environmental protection demands at home and abroad, current main contacts made of environmentally friendly materials usually do not have the ablation resistance required by actual engineering requirements.

In order to solve the conflicting problem between the main contact material and the main contact's ablation resistance, in the existing technology, the SF ₆ circuit breaker is provided with a moving arc contact at one end of the moving main contact inside the arc extinguishing chamber close to the static main contact. , the moving arc contact is closer to the static end of the arc extinguishing chamber than the moving main contact. When opening and closing, the moving arc contact contacts the static end before the moving main contact, and after the moving main contact contacts the static end, the moving arc contact contacts the static end before the moving main contact. After the static end is disconnected, it is disconnected from the static end to lead the arc generated between the moving main contact and the static end during opening and closing to the moving arc contact. By starting the arc, the moving main contact is reduced The demand for resistance to ablation allows the moving main contact to use materials that are relatively weak in resistance to ablation and more environmentally friendly.

However, the above arc ignition method is based on the fact that the moving main contact of the SF ₆ circuit breaker opens and closes in a horizontal motion, which does not match the swinging mode of the moving main contact. Of course, for the moving main contact that opens and closes in the form of swing, the moving arc contact can be connected to the moving main contact through a conductive spring. Under the action of the conductive spring, the moving arc contact will precede the moving main contact. The contact is connected to the static end and disconnected after the moving main contact is disconnected, so as to lead the arc generated by the opening and closing to the moving arc contact. However, in order to ensure the effective transmission of the conductive spring, it is necessary to reserve a space for expansion and contraction of the conductive spring in the arc extinguishing chamber, resulting in a larger size of the arc extinguishing chamber. For arc extinguishing chambers with fixed intervals between components within the arc extinguishing chamber, It is said that the conductive spring is difficult to adapt and install; and the moving main contact and the moving arc contact need to carry a large arc current. This performance cannot be achieved through a simple plug-in fit, and if the moving main contact and the moving arc contact If the moving arc contact is provided with conductive contact fingers, it will be difficult to ensure the flexible expansion and contraction of the moving main contact.

Contents of the invention

The purpose of the present invention is to provide a moving side contact assembly of a DC circuit breaker to solve the technical problem in the prior art that there is a conflict between the ablation resistance of the moving main contact and the environmentally friendly material. The invention also provides a DC circuit breaker to solve the technical problem in the prior art that the ablation resistance of the moving main contact is inconsistent with the environmentally friendly material.

In order to achieve the above object, the technical solution of the moving side contact assembly of a DC circuit breaker provided by the present invention is: a moving side contact assembly of a DC circuit breaker, including a moving main contact and a moving arc contact. The arc contact is hinged at one end of the moving main contact for contact with the static contact of the DC circuit breaker, and is provided with a conductive connection structure for carrying the arcing current between the moving main contact and the moving arc contact. It corresponds to the moving side arc striking slope of the moving side arc striking row of the DC circuit breaker, so that the power supply arc is transferred to the arc striking contact on the moving side arc striking slope. There is a driving dynamic contact between the moving main contact and the moving arc contact. The elastic member for the arc contact to swing toward the static contact is also provided with a forward swing limiting structure for limiting the swing angle of the movable arc contact toward the static contact. The forward swing limiting structure is used to make the movable arc contact The head is kept closer to the static contact relative to the movable main contact to form an arc; the movable arc contact also has a push-back stopper that is used to press against the main body of the DC circuit breaker when opening. The moving arc contact is made to swing backward and the power supply arc is transferred from the arc striking contact to the pressing part on the arc striking slope on the moving side.

The beneficial effects are: in the moving side contact assembly of the DC circuit breaker provided by the present invention, the elastic member drives the moving arc contact to always swing forward during the closing process of the moving main contact, which can make the moving arc contact move before closing. The swing limit position is reached under the action of the limit structure, ensuring that the moving arc contact can be connected to the static contact of the arc extinguishing chamber before the moving main contact, and disconnected after the moving main contact and the static contact are disconnected; Moreover, there is also a conductive connection structure for carrying arc ignition current between the moving arc contact and the moving main contact. Compared with the existing technology, it can not only lead the arc generated during opening and closing to the moving arc contact. , to prevent the main contact from being ablated, and the moving arc contact is hinged on the moving main contact in a relatively swinging manner. There is no need to reserve a large space in the DC circuit breaker, which is convenient for installation. At the same time, the moving arc contact The contacts do not need to carry normal working current, and even if ablation occurs, it will not affect the conduction of normal working current. Therefore, there is no need to use silver-oxide materials that easily cause pollution during manufacturing, and it is environmentally friendly.

As a further improvement, the conductive connection structure is a soft connection.

The beneficial effect is that while the soft connection ensures good flow, the material itself is relatively soft and easy to install.

As a further improvement, an escape groove is provided on the end face of the moving arc contact facing the stationary contact, one end of the soft connection is in the escape groove and is screw-connected to the moving main contact, and the other end is Connect with the moving arc contact screw.

The beneficial effect is: the soft connection is in the avoidance groove, which is helpful to avoid excessive exposure of the soft connection, and thereby helps to reduce the impact of arc on the conductive effect of the soft connection.

As a further improvement, the elastic member is a torsion spring.

The beneficial effect is that the directions of elastic compression and recovery of elastic deformation of the torsion spring are in the circumferential direction, which is beneficial to reducing the space requirements when installing the elastic parts, and is beneficial to making full use of the peripheral space of the existing moving main contact.

As a further improvement, in the extending direction of the swing axis of the moving main contact, a torsion spring shaft is provided on the side of the moving main contact, the torsion spring is sleeved on the torsion spring shaft, and one end of the torsion spring is fixedly connected On the moving main contact; the moving arc contact includes a contact mounting part provided with the arcing contact and a driving part arranged in an L shape with the contact mounting part and extending toward the rear, and the other end of the torsion spring presses on the drive part.

The beneficial effect is: the torsion spring is rotated and set on the torsion spring shaft. One end of the torsion spring is fixedly connected to the moving main contact, and the other end drives the moving arc contact to swing when the torsion spring rotates, which is conducive to making full use of the rotation stroke of the torsion spring. , which is helpful to ensure that the moving arc contact at the swing limit position is closer to the static contact of the arc extinguishing chamber.

As a further improvement, one of the moving arc contact and the moving main contact is provided with an arc hole, and the other is provided with a limiting pin, and the limiting pin cooperates with the front end of the arc hole to form a The front swing limiting structure.

The beneficial effect is: the arc hole and the limit pin cooperate to form a forward swing limit structure, which simplifies the structure and helps reduce production costs when the moving arc contact can be limited.

The technical solution of the DC circuit breaker provided by the present invention is: a DC circuit breaker, including a static end and a moving end. The static end is provided with a static contact and a static side conductor, the static contact is connected to the static side conductor, and the moving end It is equipped with a moving side contact assembly and a moving side conductor. The static side conductor is connected with a static side arc striking bar, and the moving side conductor is connected with a moving side arc striking bar. The static side arc striking bar and the moving side arc striking bar are used for traction. The arc generated during opening and closing. The moving side contact assembly includes a moving main contact and a moving arc contact. The moving arc contact is hinged on the moving main contact and is used to contact the static contact of the DC circuit breaker. One end is provided with a conductive connection structure for carrying the arc striking current between the moving main contact; the moving arc contact has a moving side arc slope corresponding to the moving side arc striking surface of the moving side arc striking row of the DC circuit breaker when opening to supply arc Transferred to the arcing contact on the arcing slope of the moving side, an elastic member is provided between the moving main contact and the moving arc contact to drive the moving arc contact to swing toward the static contact, and is also provided to limit the moving arc. The forward swing limiting structure is used to keep the moving arc contact closer to the static contact relative to the moving main contact to form a lead. arc; the moving arc contact also has a push-back stopper for pressing against the main body of the DC circuit breaker when opening, so that the moving arc contact swings backward and the power supply arc is transferred from the arc contact to the moving side lead. The pressing part on the arc slope.

The beneficial effects are: in the DC circuit breaker provided by the present invention, the elastic member in the moving contact assembly drives the moving arc contact to always swing forward during the closing process of the moving main contact, which can cause the moving arc contact to move before closing. The swing limit position is reached under the action of the limit structure, ensuring that the moving arc contact can be connected to the static contact of the arc extinguishing chamber before the moving main contact, and disconnected after the moving main contact and the static contact are disconnected; Moreover, there is also a conductive connection structure for carrying arc ignition current between the moving arc contact and the moving main contact. Compared with the existing technology, it can not only lead the arc generated during opening and closing to the moving arc contact. , to prevent the main contact from being ablated, and the moving arc contact is hinged on the moving main contact in a relatively swinging manner. There is no need to reserve a large space in the DC circuit breaker, which is convenient for installation. At the same time, the moving arc contact The contacts do not need to carry normal working current, and even if ablation occurs, it will not affect the conduction of normal working current. Therefore, there is no need to use silver-oxide materials that easily cause pollution during manufacturing, and it is environmentally friendly.

As a further improvement, the conductive connection structure is a soft connection.

The beneficial effect is that while the soft connection ensures good flow, the material itself is relatively soft and easy to install.

As a further improvement, an escape groove is provided on the end face of the moving arc contact facing the stationary contact, one end of the soft connection is in the escape groove and is screw-connected to the moving main contact, and the other end is Connect with the moving arc contact screw.

The beneficial effect is: the soft connection is in the avoidance groove, which is helpful to avoid excessive exposure of the soft connection, and thereby helps to reduce the impact of arc on the conductive effect of the soft connection.

As a further improvement, the elastic member is a torsion spring.

The beneficial effect is that the directions of elastic compression and recovery of elastic deformation of the torsion spring are in the circumferential direction, which is beneficial to reducing the space requirements when installing the elastic parts, and is beneficial to making full use of the peripheral space of the existing moving main contact.

As a further improvement, in the extending direction of the swing axis of the moving main contact, a torsion spring shaft is provided on the side of the moving main contact, the torsion spring is sleeved on the torsion spring shaft, and one end of the torsion spring is fixedly connected On the moving main contact; the moving arc contact includes a contact mounting part provided with the arcing contact and a driving part arranged in an L shape with the contact mounting part and extending toward the rear, and the other end of the torsion spring presses on the drive part.

The beneficial effect is: the torsion spring is rotated and set on the torsion spring shaft. One end of the torsion spring is fixedly connected to the moving main contact, and the other end drives the moving arc contact to swing when the torsion spring rotates, which is conducive to making full use of the rotation stroke of the torsion spring. , which is helpful to ensure that the moving arc contact at the swing limit position is closer to the static contact of the arc extinguishing chamber.

As a further improvement, one of the moving arc contact and the moving main contact is provided with an arc hole, and the other is provided with a limiting pin, and the limiting pin cooperates with the front end of the arc hole to form a The front swing limiting structure.

The beneficial effect is: the arc hole and the limit pin cooperate to form a forward swing limit structure, which simplifies the structure and helps reduce production costs when the moving arc contact can be limited.

As a further improvement, the moving side arc striking row includes a moving side row body, and an ablation resistant block is embedded in one end of the moving side row body.

The beneficial effects are: the moving side arc striking row is installed in blocks, which is conducive to reducing the manufacturing difficulty of the moving side arc striking row and improving the ablation resistance of the moving side arc striking row on the premise of realizing arc striking.

As a further improvement, the moving end of the DC circuit breaker is provided with a reverse push stop on the swing stroke of the moving arc contact, so that the side of the moving arc contact is aligned with the moving side arc row when opening. .

The beneficial effect is: when the gate is opened, the reverse push stop aligns the side of the moving arc contact with the moving side arc striking row, which is conducive to better arc striking and is also helpful in preventing the moving arc contact from hitting the moving side conductor.

As a further improvement, a connecting block is fixed on the static side arc striking bar and/or the moving side arc striking bar, and the connecting block is detachably fixed on the corresponding conductor, so that the static side arc striking bar and/or the moving side arc striking bar The arc rows can be disassembled individually.

The beneficial effects are: the static side arc striking row and/or the moving side arc striking row are installed in blocks, which helps to reduce the manufacturing difficulty of the arc striking row and facilitates connection with corresponding conductors on the premise of realizing arc striking.

Description of the drawings

Figure 1 is a schematic structural diagram of a DC circuit breaker provided by the present invention;

Figure 2 is a schematic assembly diagram of the static side conductor, static contact and static side arc row;

Figure 3 is a schematic diagram of the assembly of the static side conductor and the static contact;

Figure 4 is a schematic structural diagram of the static side arc ignition row in Figure 2;

Figure 5 is a schematic structural diagram of the arc strike row on the moving side;

Figure 6 is a schematic diagram of the assembly of the arc striking row and connecting row on the moving side;

Figure 7 is a schematic structural diagram of the moving main contact;

Figure 8 is a schematic structural diagram of the moving arc contact;

Figure 9 is a schematic structural diagram of the moving side contact assembly;

Figure 10 is a schematic diagram of the state when the DC circuit breaker is closed;

Figure 11 is a schematic diagram of the state of the DC circuit breaker when it is opened.

Explanation of reference signs: 1. Main body of circuit breaker; 2. Operating mechanism; 3. Moving side arc striking row; 4. Stationary side arc striking row; 5. Reverse push stop; 6. Moving main contact; 7. Moving arc Contact; 8. Stationary contact; 9. Stationary side conductor; 10. Moving side conductor; 11. Stationary side row body; 12. Stationary side connecting block; 13. Avoidance hole; 14. Moving side row body; 15. Moving side row body Side connecting block; 16. Connection row; 17. Torsion spring; 18. Soft connection; 19. Arc contact structure; 20. Third shaft hole; 21. Torsion spring shaft; 22. Arc hole; 23. Limit Pin; 24. First rotating shaft hole; 25. Pin hole; 26. Second rotating shaft hole; 27. Fixed hole; 28. Torsion spring rotating shaft; 29. Avoidance groove.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention. That is, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present invention.

It should be noted that in the specific implementation of the present invention, the terms that may appear, such as "first" and "second" and other relational terms, are only used to distinguish one entity or operation from another entity or operation. , without necessarily requiring or implying that there is such an actual relationship or sequence between these entities or operations. Furthermore, the possible occurrence of terms such as "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements not only includes those elements, but also includes Other elements not expressly listed or inherent in such process, method, article or equipment. Without further limitation, the possible occurrence of a qualifying element such as the statement "comprises a..." does not exclude the presence of other identical elements in a process, method, article or device that includes the stated element.

In the description of the present invention, unless otherwise clearly stated and limited, the terms that may appear such as "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between the two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

In the description of the present invention, unless otherwise expressly stipulated and limited, the term "is provided with" that may appear should be understood in a broad sense. For example, the object of "is provided with" can be a part of the ontology, or it can be separate from the ontology. Arranged and connected to the body, the connection may be a detachable connection or a non-detachable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in further detail below with reference to examples.

Embodiment 1 of the DC circuit breaker provided in the present invention:

As shown in Figure 1, a DC circuit breaker includes a circuit breaker body 1 and an operating mechanism 2. The static end and the moving end of the DC circuit breaker are installed on the circuit breaker body 1. The operating mechanism 2 is connected to the circuit breaker body 1 and is used to drive the moving end to open and close. The top of the circuit breaker body 1 is also equipped with an arc extinguishing grid (not shown). The arc extinguishing grid is used to control the moving end and the static end. The arc generated when the end-branch is closed is extinguished.

The static end of the DC circuit breaker is provided with a static contact 8 and a static side conductor 9. The static side conductor 9 is connected to the main body 1 of the circuit breaker. The static side conductor 9 is provided with a static side arc row 4. The static contact 8 is connected to the static side conductor 9. The side conductor 9 and the static side arc row 4 are connected together. Specifically, as shown in Figures 2 to 4, the static contact 8 has an L-shaped structure. The static contact 8 includes a transverse section and a vertical section. The transverse section is fixedly connected to the lower side of the static side conductor 9, and the vertical section is located at The side of the static side conductor 9 facing the moving side conductor 10 has bolt mounting holes on its top; the static side arc row 4 includes a static side row body 11 and a static side connecting block 12, and one end of the static side row body 11 is used for the static side. The static side connection block 12 is connected. The static side connection block 12 is a right-angled trapezoidal block structure and is used for welding to the end of the static side row body 11. The static side connection block 12 is provided with an escape hole 13, and the bottom hole of the escape hole 13 is The wall is provided with a threaded hole that penetrates the bottom of the static side connecting block 12. When connecting, the static side row body 11 of the static side arc row 4 is installed on the top side of the static side conductor 9, and the static contact 8 is vertically connected. Insert screws into the bolt mounting holes on the section and the threaded holes of the static side connection block 12 to connect the static side connection block 12 to the static contact 8 . A groove (not shown in the figure) is provided on the inclined side of the static side connecting block 12. During manufacture, a block structure with strong ablation resistance is installed in the groove to form a static side arc ignition slope.

The moving end of the DC circuit breaker is provided with a moving side contact assembly and a moving side conductor 10. The moving side conductor 10 is connected to the main body 1 of the circuit breaker. The moving side conductor 10 is provided with a moving side arc row 3. The moving side arc row 3 is arranged on the moving side conductor 10. 3 is used to cooperate with the static side arc ignition row 4 to guide the arc generated during opening and closing to the arc extinguishing grid.

As shown in Figures 5 and 6, the moving side arc row 3 includes a moving side row body 14, a moving side connecting block 15 and a connecting row 16. One end of the moving side row body 14 is connected to the moving side connecting block 12, and the moving side connection block 12 The whole block 12 has a right-angled triangle block structure. The top of the moving side connection block 15 is used to be detachably connected to the moving side row body 14. The bottom of the moving side connection block 15 is connected to the moving side conductor 10 through the connecting row 16. Specifically Ground, the connecting row 16 has a "Z"-shaped structure. The top and bottom of the connecting row 16 are provided with screw mounting holes. The bottom of the moving side connecting block 15 is provided with a mounting slot, and the top of the connecting row 16 is snapped into the mounting slot. It is connected to the moving side connecting block 15 through screws, the bottom of the connecting row 16 is screwed to the moving side conductor 10 , and then the moving side connecting block 15 is connected to the moving side conductor 10 . A groove is provided on the side of the moving side connecting block 14 facing the stationary contact 8, and an ablation-resistant block is provided in the groove to form a moving side arc starting slope.

The moving side contact assembly includes a moving main contact 6 and a moving arc contact 7. An elastic member is arranged between the moving main contact 6 and the moving arc contact 7. The elastic member drives the moving arc contact 7 relative to the moving main contact. 6 swings.

As shown in Figure 7, the moving main contact 6 has a plate-like structure as a whole, and a closing plane is provided on one side for contact with the stationary contact 8; a contact shaft hole is provided on the plate surface of the moving main contact 6 , through this hole, the moving main contact 6 can be connected to the operating mechanism 2, and the operating mechanism 2 can drive and swing. The top of the moving main contact 6 is provided with a first rotating shaft hole 24 for installing the hinge shaft, and a second rotating shaft hole 26 is provided below the first rotating shaft hole 24 for installing the elastic member.

As shown in Figure 8, the moving arc contact 7 is an L-shaped plate structure as a whole, including a contact installation part and a driving part arranged in sequence from top to bottom. The transition part between the contact installation part and the driving part is provided with a third rotating shaft hole 20. The moving arc contact 7 is set on the hinge shaft on the moving main contact 6 through the third rotating shaft hole 20, so that the moving arc contact 7 can be rotated around The hinged shaft swings relative to the moving main contact 6 . The third rotating shaft hole 20 is provided with a countersunk end. After the moving arc contact 7 is set on the hinged shaft, a retaining spring or other fixed structure is installed on the countersunk end to prevent the moving arc contact 7 from falling off. An arc-shaped contact structure 19 is provided on the side of the contact installation part of the moving arc contact 7 facing the stationary contact 8. As an arc-starting contact, the moving arc contact 7 communicates with the stationary contact through the arc-shaped contact structure 19. Head 8 is connected. The bottom side of the driving part is an arc-shaped side for connecting with the elastic member. The rear end surface of the moving arc contact 7 is provided with an escape groove 29, and a soft connection 18 is provided in the escape groove 29. The soft connection 18 serves as a conductive connection structure, and one end of the soft connection 18 located in the escape groove 29 is screwed to the moving main contact 6 , the other end is screw-connected to the moving arc contact 7.

In this embodiment, the elastic member is a torsion spring 17, and the torsion spring 17 is connected between the moving main contact 6 and the moving arc contact 7. Specifically, as shown in Figures 7 and 9, the torsion spring 17 is connected between the moving main contact 6 and the moving arc contact 7. A fixing hole 27 is provided obliquely below the second rotating shaft hole 26. The fixing hole 27 is specifically arranged at a position further away from the static contact 8 than the second rotating shaft hole 26. During installation, a twist is installed on the second rotating shaft hole 26. Spring shaft 28, the torsion spring 17 is set on the torsion spring shaft 28, and the second shaft hole 26 is provided with a countersunk end on the side of the moving main contact 6, and a positioning structure such as a circlip is installed on the countersunk end, Prevent the torsion spring 17 from coming out. One end of the torsion spring 17 is connected to the fixed hole 27 , and the other end of the torsion spring 17 is against the arc-shaped side surface of the bottom end of the driving part of the moving arc contact 7 to drive the moving arc contact 7 to swing, so that the moving arc contact 7 The arc-shaped contact structure 19 is closer to the stationary contact 8 than the closing plane of the moving main contact 6 .

In order to prevent the opening time from being too long due to excessive swing amplitude of the moving arc contact 7, as shown in Figures 7 to 9, a pin hole 25 is provided on the moving main contact 6 obliquely below the first shaft hole 24. The pin hole 25 is provided at a position further away from the static contact 8 than the first rotating shaft hole 24, and a limit pin 23 is installed in the pin hole 25; an arc hole 22 is provided on the movable arc contact 7, and the arc hole 22 is a long hole. When the moving arc contact 7 is installed on the moving main contact 6, the limit pin 23 passes through the arc hole 22. When the moving arc contact 7 swings, the limit pin 23 blocks the arc. The inner hole walls at both ends of the shaped hole 22 prevent the movable arc contact 7 from continuing to swing, so as to limit the swing stroke of the movable arc contact 7 . The front end of the arc-shaped hole 22 cooperates with the limiting pin 23 to form a forward swing limiting structure.

There is also a reverse push stop 5 at the corner between the moving side conductor 10 and the circuit breaker body 1. As shown in Figures 9 and 11, the rear end surface of the driving part of the moving arc contact 7 forms a pressing part, which presses Push the moving arc contact 7 in the unclosed state to drive, so that the moving arc contact 7 swings in the direction opposite to the swing direction of the torsion spring 17 driving the moving arc contact 7, so that the arc-shaped contact of the moving arc contact 7 The plane where the point structure 19 is located is aligned with the moving-side arc-striking slope of the moving-side arc-striking row 3 .

When the DC circuit breaker is closing, as shown in Figure 10, the operating mechanism 2 drives the moving main contact 6 to swing toward the stationary contact 8. When the moving arc contact 7 moves away from the reverse push block 5, the torsion spring 17 drives the moving arc. The contact 7 swings toward the static contact 8. When the moving arc contact 7 moves away from the reverse push block 5, the torsion spring 17 drives the moving arc contact 7 to continue swinging until the limit pin 23 installed on the moving main contact 6 is in contact with the stopper 5. The rear end hole wall of the arc hole 22 is blocked, the moving arc contact 7 reaches the forward swing limit position, and the moving arc contact 7 no longer swings relative to the moving main contact 6 . At this time, the arc-shaped contact structure 19 of the moving arc contact 7 is closer to the stationary contact 8 than the moving arc contact 7 . When the operating mechanism 2 continues to drive the moving main contact 6 to swing, the moving main contact 6 Continue to bring the moving arc contact 7 close to the stationary contact 8. After the arc-shaped contact structure 19 of the moving arc contact 7 contacts the stationary side arc row 4, under the thrust of the stationary side arc row 4, the moving arc contact The head 7 begins to swing in the opposite direction, and the torsion spring 17 undergoes elastic compression until the moving main contact 6 contacts the static contact 8, and the closing is completed. Since the arc-shaped contact structure 19 of the moving arc contact 7 is closer to the static side arc row 4 before the moving main contact 6, during the closing process, arc will be generated around the moving arc contact 7, which will avoid An arc is formed on the moving main contact and ablation occurs.

When the DC circuit breaker is opened, as shown in Figure 11, the operating mechanism 2 drives the main contact 6 to swing in the reverse direction. After the moving main contact 6 gradually moves away from the static contact 8, the torsion spring 17 will gradually restore its own elastic deformation. , during the process of the torsion spring 17 recovering its elastic deformation, the movable arc contact 7 is driven to swing toward the stationary contact 8 relative to the movable main contact 6, so that the arc contact structure 19 on the movable arc contact 7 is in contact with the stationary side arc row. 4 can still maintain contact for a certain period of time, and the moving main contact 6 can separate from the stationary contact 8 in advance. When the arc contact structure 19 is separated from the static side arc row 4, an arc is generated between the moving arc contact 7 and the stationary contact 8, and the arc is guided to the metal grid by the passive side arc row 3 and the static side arc row 4. The board gradually goes out. When the moving main contact 6 drives the moving arc contact 7 to contact the limiting block 5 , the limiting block 5 overcomes the force of the torsion spring 17 and pushes the moving arc contact 7 to swing toward the moving side conductor 10 until the moving main contact 6 After swinging to the starting position, the opening is completed.

In the DC circuit breaker provided by the present invention, the elastic member in the moving contact assembly drives the moving arc contact 7 to always swing forward during the closing process of the moving main contact 6, which can make the moving arc contact 7 move forward before closing. The swing limit position is reached under the action of the limiting structure, ensuring that the moving arc contact 7 can be connected to the static contact 8 of the arc extinguishing chamber before the moving main contact 6, and the moving main contact 6 and the static contact 8 are disconnected and then disconnected; and there is also a conductive connection structure for carrying arc starting current between the moving arc contact 7 and the moving main contact 6. Compared with the existing technology, not only can the arc generated when opening and closing can be to the moving arc contact to prevent the main contact from being ablated, and the moving arc contact 7 is hinged on the moving main contact 6 in a relatively swinging manner, so there is no need to reserve a large space in the DC circuit breaker. , easy to install.

Embodiment 2 of the DC circuit breaker provided by the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the torsion spring 17 is sleeved on the rotating shaft installed below the moving arc contact 7 . In this embodiment, the torsion spring 17 is directly sleeved on the hinge shaft for the moving arc contact 7 to hinge. When installed, one end of the torsion spring 17 is fixed to the moving arc contact 7 and the other end is fixed to the moving main contact 6 superior.

Embodiment 3 of the DC circuit breaker provided by the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the arc hole 22 is provided on the moving arc contact 7 , and the limiting pin 23 is installed on the moving main contact 6 . In this embodiment, the limiting pin 23 is provided on the moving arc contact 7 , and the arc-shaped hole 22 is provided on the moving main contact 6 .

Embodiment 4 of the DC circuit breaker provided by the present invention:

The difference between this embodiment and Embodiment 1 is that: in Embodiment 1, the arc hole 22 is provided on the moving arc contact 7, the limit pin 23 is installed on the moving main contact 6, the arc hole 22 is connected with the limit pin 23. The position pin 23 forms a limiting structure. In this embodiment, the arc hole 22 and the limit pin 23 are not provided on the moving arc contact 7 and the moving main contact 6. The moving main contact 6 is provided with two limits below the moving arc contact 7. blocks, the two limit blocks are arranged at intervals, and are used to respectively block the bottom arc-shaped side of the movable arc contact 7 when the movable arc contact 7 swings back and forth, and the two limit blocks form a limit structure.

Embodiment 5 of the DC circuit breaker provided by the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the moving side arc row 3 includes a moving side row body 14 and a moving side connecting block 15 that are separately arranged. The moving side conductor 10 and the moving side connecting block 12 detachable connections. In this embodiment, the moving side arc row 3 and the moving side conductor 10 are integrally formed.

Embodiment 6 of the DC circuit breaker provided in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the static side arc row 4 includes a separately arranged static side row body 11 and a static side connection block 12, and the static side conductor 9 and the static side connection block 12 detachable connections. In this embodiment, the static side arc row 4 and the static side conductor 9 are integrally formed.

Embodiment 7 of the DC circuit breaker provided in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the elastic member is a torsion spring 17 . In this embodiment, the elastic member is a compression spring. Specifically, the top of the driving part of the moving arc contact 7 is provided with a flange, and a compression spring is disposed between the flange and the top of the moving main contact 6. The compression spring drives The moving arc contact 7 swings.

The present invention also provides an embodiment of the moving side contact assembly of the DC circuit breaker:

The structure of the moving side contact assembly of the DC circuit breaker in this embodiment is the same as the structure of the moving side contact assembly of the DC circuit breaker in Embodiment 1, and will not be described again here.

Of course, in other embodiments, the moving side contact assembly of the DC circuit breaker can also adopt the structure of the moving side contact assembly in any of the DC circuit breaker embodiments 2 to 7, which will not be described again here.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The patent protection scope of the present invention shall be subject to the claims. Any equivalent structural changes made using the contents of the description and drawings of the present invention , should be included in the protection scope of the present invention.

Claims (10)

1. A moving side contact assembly of a DC circuit breaker, characterized in that it includes a moving main contact (6) and a moving arc contact (7), and the moving arc contact (7) is hinged on the moving main contact. (6) The end used for contacting the static contact (8) of the DC circuit breaker is provided with a conductive connection structure for carrying the arcing current between the moving main contact (6); the moving arc contact (7) has When opening, it corresponds to the moving side arc striking slope of the moving side arc striking bar (3) of the DC circuit breaker, so that the power supply arc is transferred to the arcing contact on the moving side arc striking slope. The moving main contact (6) is in contact with the moving side arc striking slope. An elastic member is provided between the arc contacts (7) to drive the movable arc contact (7) to swing toward the stationary contact (8), and is also provided to limit the movable arc contact (7) to swing toward the stationary contact. The forward swing limiting structure of the swing angle of (8) is used to keep the moving arc contact (7) closer to the static contact (8) relative to the moving main contact (6). position to form an arc; the moving arc contact (7) also has a push-back stopper (5) used to press against the main body of the DC circuit breaker during opening to make the moving arc contact (7) swing backwards The power supply arc is transferred from the arc-ignition contact to the pressing part on the arc-ignition slope on the moving side. 2. The moving side contact assembly of the DC circuit breaker according to claim 1, characterized in that the conductive connection structure is a soft connection (18). 3. The moving side contact assembly of the DC circuit breaker according to claim 2, characterized in that an escape groove ( 29), one end of the soft connection (18) is located in the escape groove (29) and is screwed to the moving main contact (6), and the other end is screwed to the moving arc contact (7). 4. The moving side contact assembly of the DC circuit breaker according to claim 1, 2 or 3, characterized in that the elastic member is a torsion spring (17). 5. The moving side contact assembly of the DC circuit breaker according to claim 4, characterized in that, in the extending direction of the swing axis of the moving main contact (6), the side surfaces of the moving main contact (6) There is a torsion spring rotating shaft (28) on the torsion spring rotating shaft (28). The torsion spring (17) is sleeved on the torsion spring rotating shaft (28). One end of the torsion spring (17) is fixedly connected to the moving main contact (6); the moving arc contact (7) It includes a contact installation part provided with the arcing contact and a driving part arranged in an L shape with the contact installation part and extending toward the rear. The other end of the torsion spring (17) is pressed against the driving part superior. 6. The moving side contact assembly of the DC circuit breaker according to claim 1 or 2 or 3, characterized in that one of the moving arc contact (7) and the moving main contact (6) An arc hole (22) is provided, and the other is provided with a limit pin (23). The limit pin (23) cooperates with the front end stop of the arc hole (22) to form the front swing limit structure. 7. A DC circuit breaker, including a static end and a moving end. The static end is provided with a static contact (8) and a static side conductor (9). The static contact (8) is connected to the static side conductor (9). The end is provided with a moving side contact assembly and a moving side conductor (10). The stationary side conductor (9) is connected to a stationary side arc strike bar (4), and the moving side conductor (10) is connected to a moving side arc strike bar (3). ), the static side arc striking row (4) and the moving side arc striking row (3) are used to pull the arc generated when opening and closing; characterized in that the moving side contact assembly is any one of claims 1 to 6 The moving side contact assembly of the DC circuit breaker described in the item. 8. The DC circuit breaker according to claim 7, characterized in that the moving side arc row (3) includes a moving side row body (14), and one end of the moving side row body (14) is embedded and fixed with a resistant Ablative block. 9. The DC circuit breaker according to claim 7, characterized in that the moving end of the DC circuit breaker is provided with a reverse push stop (5) on the swing stroke of the moving arc contact (7) to prevent the breaker from breaking. When the gate is closed, the side surface of the moving arc contact (7) is aligned with the moving side arc row (3). 10. The DC circuit breaker according to claim 7, characterized in that a connecting block is fixed on the static side arc striking bar (4) and/or the moving side arc striking bar (3), and the connecting block is detachably fixed on the on the corresponding conductors so that the static side arc strike bar (4) and/or the moving side arc strike bar (3) can be disassembled separately.