Switch unit and isolating switch or dual-power change-over switch

Abstract

The invention discloses a switch unit and an isolating switch or a dual-power change-over switch, and relates to the technical field of low-voltage electrical appliances, the switch unit comprises a contact mechanism and an arc extinguishing mechanism, the contact mechanism comprises a moving contact and a static contact, the moving contact moves relative to the static contact to form a motion path matched with the static contact to open and close, and the arc extinguishing mechanism is arranged on the moving contact. The arc extinguishing mechanism comprises an installation cavity, arc extinguishing grid pieces and conduction grid pieces, the installation cavity is divided into a first sub-cavity close to one side of the static contact and a second sub-cavity away from one side of the static contact along the motion path of the moving contact, and the arc extinguishing grid pieces comprise the first sub-grid pieces located in the first sub-cavity and the second sub-grid pieces located in the second sub-cavity; and the conduction grid sheet is connected with the first sub grid sheet and extends towards the second sub cavity, and / or the conduction grid sheet is connected with the second sub grid sheet and extends towards the first sub cavity. The switch unit can solve the problem that in the prior art, when a moving contact is opened, electric arc is difficult to migrate to the deep position of an arc extinguish chamber.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a switch unit and an isolating switch or a dual power transfer switch. Background Art

[0002] Switching devices play two roles in the power system: one is the control role, that is, according to the operation needs of the power system, a part of the power equipment or lines are put into or out of operation; the other is the protection role, that is, when a fault occurs in the power equipment or line, the faulty part is quickly removed from the power system to ensure the normal operation of the fault-free part of the power system.

[0003] In existing technology, the moving contact of a switching device can move relative to the stationary contact, moving away from or approaching it to achieve opening and closing. During the opening process, the electric field formed in the area swept by the moving contact is at a similar level to the electric field strength around the arc quenching grid. This uneven distribution of the electric field weakens the driving force for the arc to migrate deeper into the arc extinguishing chamber, making it difficult for the arc to smoothly enter the terminal area of ​​the arc extinguishing chamber. Summary of the Invention

[0004] The purpose of the present application is to provide a switch unit and an isolating switch or a dual power conversion switch, which can solve the problem in the prior art that when the moving contact is opened, the electric field formed in the sweeping area thereof is similar to the electric field strength around the arc extinguishing grid, making it difficult for the arc to migrate deep into the arc extinguishing chamber.

[0005] The embodiment of the present application is implemented as follows:

[0006] According to a first aspect of an embodiment of the present application, a switch unit is provided, comprising a contact mechanism and an arc extinguishing mechanism disposed on one side of the contact mechanism. The contact mechanism includes a movable contact and a stationary contact, the movable contact moving relative to the stationary contact to form a motion path for coordinating the opening and closing of the stationary contact. The arc extinguishing mechanism includes a mounting chamber, an arc extinguishing grid, and a conductive grid. Along the motion path of the movable contact, the mounting chamber is divided into a first sub-chamber proximal to the stationary contact and a second sub-chamber distal to the stationary contact. The arc extinguishing grid includes a first sub-grid located within the first sub-chamber and a second sub-grid located within the second sub-chamber. The conductive grid is connected to the first sub-grid and extends toward the second sub-chamber, and / or the conductive grid is connected to the second sub-grid and extends toward the first sub-chamber. This switch unit can solve the problem in the prior art where, when the movable contact opens, the electric field formed in its sweeping area is similar in strength to the electric field surrounding the arc extinguishing grid, making it difficult for the arc to migrate deeper into the arc extinguishing chamber.

[0007] As an implementation method, there is one conductive grid, which is connected to the first sub-grid and extends toward the second sub-grid, or connected to the second sub-grid and extends toward the first sub-grid.

[0008] As an implementation method, the number of the conductive grids is at least two, one of the conductive grids is connected to the first sub-grid and extends toward the second sub-grid, and the other conductive grid is connected to the second sub-grid and extends toward the first sub-grid, and the two conductive grids distributed along the movement direction of the moving contact are arranged at intervals.

[0009] As an embodiment, it further includes a shell, the conductive grid is located on the side of the installation chamber away from the moving contact, the conductive grid includes a connecting section connected to the first sub-grid and / or the second sub-grid and an extension section extending along the arrangement direction of the arc-extinguishing grid, and a first rib is provided on the shell, the first rib is located between the arc-extinguishing grid and the extension section, and the projection of the first rib along the extension direction of the arc-extinguishing grid covers the projection of the extension section along the extension direction of the arc-extinguishing grid.

[0010] As an implementation method, the number of the conductive grids is at least two, and the housing is further provided with a second rib, which is located between two conductive grids distributed along the movement direction of the moving contact.

[0011] As an implementation method, the surface of the conductive grid is covered with an insulating sheath.

[0012] As an implementation method, the first sub-grid includes an arc-striking grid, a first end of the arc-striking grid is connected to the static contact, and a second end of the arc-striking grid is connected to the conductive grid.

[0013] As an implementable embodiment, the arc extinguishing mechanism also includes an arc-striking piece, which is arranged on the movement path of the moving contact, and the arc-striking piece is located on the side of the installation chamber away from the static contact. When the moving contact moves toward the side away from the static contact, the arc-striking piece can be clamped and contacted with the moving contact.

[0014] As an implementation method, the moving contact includes a contact bracket and two moving contact pieces arranged at intervals. The contact bracket is driven to move the two moving contact pieces so that the two moving contact pieces respectively clamp the opposite sides of the arc-striking piece. The arc-striking piece is made of conductive material and is used to transfer the arc on the moving contact into the installation chamber.

[0015] A second aspect of the present application provides an isolating switch or dual power transfer switch, comprising a handle, an operating mechanism, and the aforementioned switch unit. The switch units are multiple, and the multiple switch units and the operating mechanism are stacked in sequence. The handle is connected to the movable contacts of the multiple switch units via the operating mechanism, and the handle is used to drive the operating mechanism to move, thereby causing the movable contacts of the multiple switch units to move synchronously. This switch unit can solve the problem in the prior art where, when the movable contact opens, the electric field formed in its sweeping area is similar in strength to the electric field surrounding the arc quenching grid, making it difficult for the arc to migrate deeper into the arc quenching chamber.

[0016] The beneficial effects of the embodiments of the present application include:

[0017] The switch unit includes a contact mechanism and an arc extinguishing mechanism arranged on one side of the contact mechanism. The contact mechanism includes a moving contact and a static contact. The moving contact moves relative to the static contact to form a movement path for cooperating with the static contact to open and close the switch. The arc extinguishing mechanism includes an installation chamber, an arc extinguishing grid and a conductive grid. Along the movement path of the moving contact, the installation chamber is divided into a first sub-chamber close to the static contact and a second sub-chamber away from the static contact. The arc extinguishing grid includes a first sub-grid located in the first sub-chamber and a second sub-grid located in the second sub-chamber. The conductive grid is connected to the first sub-grid and extends toward the second sub-chamber, and / or the conductive grid is connected to the second sub-grid and extends toward the first sub-chamber. When the moving contact moves from the closing position to the opening direction, an arc is generated at the moment when the moving contact and the static contact separate. In the initial stage of opening, the arc is located between the moving contact and the static contact, close to the entrance of the first sub-chamber; when the conductive grid is connected to the first sub-grid and extends toward the second sub-chamber, the additional electric field formed by it significantly increases the electric field strength of the second sub-grid in the second sub-chamber (i.e., deep). The arc, which was originally difficult to migrate due to the weak electric field strength in the second sub-chamber, will be attracted to move toward the second sub-chamber under the action of the high electric field. In this way, the arc can first enter the first sub-chamber and be cut and cooled by the first sub-grid. Secondly, under the guidance of the conductive grid, the arc will continue to migrate to the second sub-chamber, so that the first sub-grid and the second All sub-grids participate in arc extinguishing, which increases the number of arc extinguishing grids participating in arc extinguishing and ultimately improves the arc extinguishing capability of high voltage; and / or, when the conductive grid is connected to the second sub-grid and extends toward the first sub-chamber, it will also significantly increase the electric field strength of the second sub-grid in the second sub-chamber (i.e., deep inside). The arc, which was originally difficult to migrate due to the weak electric field strength in the second sub-chamber, is attracted to move toward the second sub-chamber under the action of the high electric field. In this way, the arc can be divided and extinguished by the first sub-grid and the second sub-grid, thereby improving the migration capability of the arc and thereby improving the arc extinguishing efficiency of the arc extinguishing mechanism. At the same time, it can also avoid long-term burning in the sweeping area of ​​the moving contact, thereby improving the service life of the moving contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 Structure schematic diagram of a switch unit provided by the embodiments of the present application;

[0020] Figure 2 Structure schematic diagram of a switch unit provided by the embodiments of the present application;

[0021] Figure 3 Structure schematic diagram of an arc extinguishing mechanism provided by the embodiments of the present application;

[0022] Figure 4 Structure schematic diagram of a static contact and an arc striking grid provided by the embodiments of the present application.

[0023] Figure: 100 - switch unit; 11 - moving contact; 111 - moving contact piece; 112 - contact support; 12 - static contact; 21 - mounting chamber; 211 - first sub-chamber; 212 - second sub-chamber; 22 - arc extinguishing grid piece; 221 - first sub-grid piece; 222 - second sub-grid piece; 23 - conducting grid piece; 231 - connecting section; 232 - extending section; 30 - shell; 31 - first rib; 32 - second rib; 33 - third rib; 40 - arc striking grid piece; 50 - arc striking piece; A - arrangement direction; B - extending direction. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. It should be noted that: similar labels and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0025] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of the application is usually placed when in use. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. Terms such as "first", "second", and "third" are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0026] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections, indirect connections through an intermediate medium, or connections within two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] Please refer to Figures 1 to 4 An embodiment of the present application provides a switch unit 100, including a contact mechanism and an arc extinguishing mechanism arranged on one side of the contact mechanism, the contact mechanism including a moving contact 11 and a static contact 12, the moving contact 11 moves relative to the static contact 12 to form a movement path for cooperating with the static contact 12 to open and close the switch, the arc extinguishing mechanism including an installation chamber 21, an arc extinguishing grid 22 and a conductive grid 23, along the movement path of the moving contact 11, the installation chamber 21 is divided into a first sub-chamber 211 on a side close to the static contact 12 and a second sub-chamber 212 on a side away from the static contact 12, the arc extinguishing grid 22 includes a first sub-grid 221 located in the first sub-chamber 211 and a second sub-grid 222 located in the second sub-chamber 212; the conductive grid 23 is connected to the first sub-grid 221 and extends toward the second sub-chamber 212, and / or the conductive grid 23 is connected to the second sub-grid 222 and extends toward the first sub-chamber 211. The switch unit 100 can increase the electric field strength of the second sub-grid 222 in the second sub-chamber 212, thereby solving the problem in the prior art that when the moving contact 11 is opened, the electric field formed in the sweeping area thereof is similar to the electric field strength around the arc extinguishing grid 22, making it difficult for the arc to migrate deep into the arc extinguishing chamber.

[0028] It should be noted that the switch unit 100 includes a contact mechanism and an arc extinguishing mechanism disposed on one side of the contact mechanism, so as to extinguish the arc generated when the contact mechanism is opened. The contact mechanism includes a moving contact 11 and a stationary contact 12. For example, the moving contact 11 is mounted on one side of the stationary contact 12 via a rotating shaft and can move relative to the stationary contact 12 around the rotating shaft to form a movement path for opening and closing. The stationary contact 12 is fixedly mounted at the starting end of the movement path. When the switch is closed, the stationary contact 12 contacts and conducts electricity. When the switch is opened, the moving contact 11 and the stationary contact 12 are separated and disconnected as the moving contact 11 moves.

[0029] The arc extinguishing mechanism includes an installation chamber 21 and an arc extinguishing grid 22. The installation chamber 21 has an overall arc-shaped cavity structure and is arranged outside the movement path of the moving contact 11. Its inner cavity is divided into a first sub-chamber 211 and a second sub-chamber 212 along the movement direction of the moving contact 11 (from close to the static contact 12 to away from the static contact 12). The two sub-chambers jointly cover the arc generation and migration area when the moving contact 11 is opened; the arc extinguishing grid 22 includes a first sub-grid 221 and a second sub-grid 222. The first sub-grid 221 is evenly distributed in the first sub-chamber 211 (close to the static contact 12), and the second sub-grid 222 is evenly distributed in the second sub-chamber 212 (away from the static contact 12). The arrangement direction of the two groups of sub-grids is perpendicular or approximately perpendicular to the movement path of the moving contact 11, and the spacing between adjacent sub-grids is consistent to ensure the uniformity of the electric field.

[0030] On this basis, the arc extinguishing mechanism also includes a conductive grid 23. The material of the conductive grid 23 can be the same as that of the arc extinguishing grid 22. The conductive grid 23 is located on the side of the installation chamber 21 where the moving contact 11 is not provided. For example, the conductive grid 23 can be located on the side of the installation chamber 21 away from the moving contact 11, or the conductive grid 23 can also be located on any side of the installation chamber 21 along the movement path of the moving contact 11; the conductive grid 23 is connected to the first sub-grid 221 and extends toward the second sub-chamber 212, and / or the conductive grid 23 is connected to the second sub-grid 222 and extends toward the first sub-chamber 211.

[0031] When the moving contact 11 moves from the closing position to the opening direction, an arc is generated at the moment when the moving contact 11 and the static contact 12 are separated. In the initial stage of opening, the arc is located between the moving contact 11 and the static contact 12, close to the entrance of the first sub-chamber 211. If the conductive grid 23 is not provided, the electric field strength of the first sub-grid 221 and the second sub-grid 222 gradually decreases as the distance from the static contact 12 increases. However, when the conductive grid 23 is connected to the first sub-grid 221 and moves toward the static contact 12, the electric field strength of the first sub-grid 221 and the second sub-grid 222 gradually decreases as the distance from the static contact 12 increases. When extending to the second sub-chamber 212, the additional electric field formed by it significantly increases the electric field strength of the second sub-grid 222 in the second sub-chamber 212 (i.e., the deep part). The arc, which was originally difficult to migrate due to the weak electric field strength in the second sub-chamber 212, will be attracted to move toward the second sub-chamber 212 under the action of the high electric field. In this way, the arc can first enter the first sub-chamber 211 and be cut and cooled by the first sub-grid 221. Secondly, under the guidance of the conductive grid 23, the arc It will also continue to migrate toward the second sub-chamber 212 and be divided and extinguished by the second sub-grid 222, ultimately improving the arc extinguishing ability of the high voltage; and / or, when the conductive grid 23 is connected to the second sub-grid 222 and extends toward the first sub-chamber 211, it can also significantly increase the electric field strength of the second sub-grid 222 in the second sub-chamber 212 (i.e., deep). The arc, which was originally difficult to migrate to due to the weak electric field strength of the second sub-grid 222, is attracted to move toward the second sub-grid 222 under the action of the high electric field. In this way, the arc can enter the first sub-chamber 211 and the second sub-chamber 212 and be divided and extinguished by the first sub-grid 221 and the second sub-grid 222, thereby increasing the number of arc extinguishing grids 22 participating in the arc extinguishing. As a result, the arc migration ability can be improved, thereby improving the arc extinguishing efficiency of the arc extinguishing mechanism. At the same time, it can also avoid long-term burning in the sweeping area of ​​the moving contact 11, thereby improving the service life of the moving contact 11.

[0032] As an implementable embodiment, in some embodiments, there is one conductive gate 23 , which is connected to the first sub-gate 221 and extends toward the second sub-gate 222 , or connected to the second sub-gate 222 and extends toward the first sub-gate 221 .

[0033] It should be noted that when the number of the conductive grid 23 is one, the electric field conduction between the first sub-grid 221 and the second sub-grid 222 can be achieved through two extension methods: First, one end of the conductive grid 23 is fixedly connected to the first sub-grid 221 located in the first sub-chamber 211, and the other end extends toward the side of the second sub-grid 222 located in the second sub-chamber 212. The end of the conductive grid 23 maintains a certain gap with the second sub-grid 222 to avoid direct contact. The conductive grid 23 is distributed along the outside of the installation chamber 21 away from the movable contact 11 and is insulated from the installation chamber 21 (for example, by an insulating gasket). The electric field strength of the second sub-grid 222 in the second sub-chamber 212 (i.e., the deep part) is significantly improved. The second method is that one end of the conductive grid 23 is fixedly connected to the second sub-grid 222 located in the second sub-chamber 212, and the other end extends toward the side of the first sub-grid 221 located in the first sub-chamber 211. The end of the conductive grid 23 maintains a certain gap with the first sub-grid 221. The conductive grid 23 is distributed along the outside of the installation chamber 21 away from the movable contact 11 and is insulated from the installation chamber 21 (such as by an insulating gasket). This can also significantly improve the electric field strength of the second sub-grid 222 in the second sub-chamber 212.

[0034] When the switch is opened, an arc is first generated near the first sub-grid 221 of the first sub-chamber 211. If the conductive grid 23 extends from the first sub-grid 221 to the second sub-grid 222, or from the second sub-grid 222 to the first sub-grid 221, the conductive grid 23 can transfer the electric field of the first sub-grid 221 toward the second sub-grid 222, significantly increasing the electric field strength in the second sub-chamber 212 (i.e., the deeper portion), attracting the arc toward the first sub-chamber 211 or second sub-chamber 212. This avoids arc stagnation and low arc extinguishing efficiency caused by the arc not migrating toward the second sub-grid 222 due to the low electric field strength at the second sub-grid 222. Both extension methods use a single conductive grid 23 to increase the electric field strength deep within the installation chamber 21 (i.e., the second sub-grid 222), driving the arc toward the deeper portion of the installation chamber 21 (i.e., the second sub-grid 222), thereby improving arc extinguishing efficiency.

[0035] As an implementable method, Figures 1 to 4 As shown, in other embodiments, the number of the conductive grids 23 is at least two, one conductive grid 23 is connected to the first sub-grid 221 and extends toward the second sub-grid 222, and the other conductive grid 23 is connected to the second sub-grid 222 and extends toward the first sub-grid 221, and the two conductive grids 23 distributed along the movement direction of the moving contact 11 are arranged at intervals.

[0036] It should be noted that when the number of conductive grid sheets 23 is at least two, one end of one conductive grid sheet 23 can be fixedly connected to the first sub-grid sheet 221 located in the first sub-chamber 211, and the other end extends towards the side of the second sub-grid sheet 222 located in the second sub-chamber 212; one end of the other conductive grid sheet 23 is fixedly connected to the second sub-grid sheet 222, and the other end extends towards the side of the first sub-grid sheet 221, forming a "opposite extension" structure. Along the movement direction of the moving contact 11, the two conductive grid sheets 23 are arranged at intervals, and the interval can be consistent with the interval between the two adjacent sub-grid sheets, that is, the ends of the two conductive grid sheets 23 do not contact, forming an intermediate gap, and the conductive grid sheet 23 is distributed away from the outer side of the moving contact 11 along the installation chamber 21, and is insulated from the installation chamber 21 (such as being isolated by an insulating pad), thereby the conductive grid sheet 23 can form a continuous conductive framework together with the first sub-grid sheet 221 and the second sub-grid sheet 222.

[0037] When the switch is opened, the arc is first generated near the first sub-grid sheet 221 of the first sub-chamber 211 and is divided by the first sub-grid sheet 221. At this time, the conductive grid sheet 23 connected to the first sub-grid sheet 221 forms a strong electric field region through the conductive characteristic, guiding the arc to move to the end of the first sub-grid sheet 221; after the arc enters the end of the first sub-grid sheet 221, the electric field formed by the other conductive grid sheet 23 connected to the second sub-grid sheet 222 guides the arc to be "pulled into" the second sub-chamber 212. The two conductive grid sheets 23 are arranged at intervals, which can avoid mutual interference of electric fields, and at the same time, through the stepped electric field gradient (gradually increasing from the first sub-chamber 211 to the second sub-chamber 212), it is ensured that the arc continuously migrates to the deep part of the installation chamber 21 (i.e. the second sub-grid sheet 222), and does not stay in a certain area.

[0038] As an implementable manner, as shown in Figure 1 and Figure 2 The switch unit 100 further includes a housing 30, and the conductive grid sheet 23 is located on the side of the installation chamber 21 away from the moving contact 11, so that the overall height of the switch unit 100 does not need to be increased; further, the conductive grid sheet 23 includes a connecting section 231 connected to the first sub-grid sheet 221 and / or the second sub-grid sheet 222 and an extension section 232 extending along the arrangement direction A of the arc extinguishing grid sheet 22, the housing 30 is provided with a first rib 31, the first rib 31 is located between the arc extinguishing grid sheet 22 and the extension section 232, and the extension section 232 and the remaining arc extinguishing grid sheet 22 (i.e. the arc extinguishing grid sheet 22 except the first sub-grid sheet 221 and / or the second sub-grid sheet 222 connected to the conductive grid sheet 23) are insulated; and further, the projection of the first rib 31 along the extension direction B of the arc extinguishing grid sheet 22 covers the projection of the extension section 232 along the extension direction B of the arc extinguishing grid sheet 22.

[0039] It should be noted that the first rib 31 is made of insulating material (such as reinforced nylon or ceramic), is in the shape of a long strip, and extends in a direction perpendicular to the movement plane of the moving contact 11. The height of the first rib 31 should match the depth of the installation chamber 21, the length covers the axial range of the conductive grid 23, and the thickness should be slightly smaller than the gap between the arc extinguishing grid 22 and the conductive grid 23 to ensure that there is no mechanical interference. The first rib 31 is fixed to the inner wall of the housing 30 and is located in the gap between the arc-quenching grid 22 (including the first sub-grid 221 and the second sub-grid 222) and the conductive grid 23. The projection of the first rib 31 along the extension direction B of the arc-quenching grid 22 (i.e., the direction in which the belly of the arc-quenching grid 22 extends toward the legs of the arc-quenching grid 22) completely covers the projection area of ​​the extension section 232, forming a physical isolation barrier. This prevents the extension section 232 and the remaining arc-quenching grids 22 (i.e., the arc-quenching grids 22 other than the first sub-grid 221 and / or the second sub-grid 222 connected to the conductive grid 23) from forming an abnormal conductive path due to arc breakdown, which could lead to failure of the first sub-grid 221 and / or the second sub-grid 222 located on the side of the extension section 232 of the conductive grid 23, particularly in high voltage scenarios. Because the first ribs 31 provide insulation for the extended segments 232 of the conductive grid 23 and the remaining arc-extinguishing grids 22 , when the arc transfers from the arc-extinguishing grid 22 to the conductive grid 23 , the first ribs 31 prevent the arc from diverging along the extension direction B of the arc-extinguishing grid 22 , forcing the arc to move between the arc-extinguishing grids 22 , thereby improving the arc extinguishing effect.

[0040] As an implementable method, Figure 1 and Figure 2 As shown, there are at least two conductive grids 23 , and the housing 30 is further provided with a second rib 32 . The second rib 32 is located between the two conductive grids 23 distributed along the moving direction of the moving contact 11 .

[0041] It should be noted that when the number of conductive grids 23 is at least two, a second rib 32 is further provided on the shell 30. The second rib 32 is made of an insulating material (such as reinforced nylon or ceramic), is in the shape of a long strip, and extends along a straight line perpendicular to the movement direction of the moving contact 11. The second rib 32 is located in the gap between the two conductive grids 23 distributed along the movement direction of the moving contact 11, that is, the second rib 32 is clamped in the middle area of ​​the two adjacent conductive grids 23 to prevent breakdown between the two conductive grids 23, resulting in failure of the arc extinguishing grid 22 located between the two conductive grids 23, thereby forming a physical isolation barrier for the gap between the two conductive grids 23.

[0042] As an implementation method, the surface of the conductive grid 23 is covered with an insulating sheath.

[0043] It should be noted that an insulating sheath (such as polytetrafluoroethylene or silicone rubber) is provided on the surface of the conductive grid 23, and an opening (the size of the opening matches the connection end) is reserved only at the connection portion between the conductive grid 23 and the first sub-grid 221 and the second sub-grid 222 to ensure that the electrical connection between the two is not affected; through the insulating sheath, combined with the first rib 31 and the second rib 32, a multiple insulation protection structure can be formed. In some embodiments, a third rib 33 is also provided on the shell 30, and the third rib 33 is located on the outside of the conductive grid 23 away from the installation chamber 21.

[0044] The insulating sheath blocks direct electric field coupling between the conductive grid 23 and surrounding metal components, preventing the arc from adhering to the surface of the conductive grid 23 due to electric field distortion during arc migration, ensuring that the arc travels along the predetermined path (from the arc-starting grid 40 through the conductive grid 23 to the arc-extinguishing grid 22). The insulating sheath, combined with the radial projection of the first ribs 31, further strengthens the insulation isolation between the arc-extinguishing grid 22 and the conductive grid 23. Furthermore, the insulating sheath and the second ribs 32 form a cross-insulation barrier between the two conductive grids 23, preventing breakdown discharges between adjacent conductive grids 23 due to excessively strong electric fields. In other words, the insulating sheath does not affect the conductive grid 23's electrical conductivity (it only isolates the surface electric field, not blocking internal current), preserving the conductive grid 23's arc-guiding function while eliminating the risk of surface leakage.

[0045] As an implementable method, Figure 1 、 Figure 2 and Figure 4 As shown, the first sub-grid 221 includes an arc-starting grid 40 . The first end of the arc-starting grid 40 can be connected to the static contact 12 by welding or bolting, and the second end can be directly connected to the conductive grid 23 .

[0046] When the circuit breaker is opened, the moving contact 11 and the static contact 12 separate to generate an arc. In the initial stage of opening the circuit breaker, the arc adheres to the surface of the static contact 12. Since the arc-striking grid 40 is conductively connected to the static contact 12, its electric field strength is the highest in the arc extinguishing mechanism (that is, higher than the second sub-grid 222 and other first sub-grids 221). One end of the conductive grid 23 is directly connected to the arc-striking grid 40, and the other end extends toward the second sub-grid 222. The electric field strength at the second sub-grid 222 can be further increased, making it easier for the arc to enter the first sub-chamber 211 and the second sub-chamber 212.

[0047] As an implementable method, Figure 1 and Figure 2 As shown, the second end of the arc striking grid 40 is adjacent to the first sub-grid 221 located on the side close to the static contact 12, and the two are parallel or approximately parallel to each other.

[0048] It should be noted that in some embodiments, the spacing between the arc-starting grid 40 and its adjacent first sub-grid 221 is kept within a relatively small range (e.g., 1-3 mm), and the two are parallel or approximately parallel to each other. This parallel and adjacent design shortens the arc transfer time from the arc-starting grid 40 to the first sub-grid 221, reduces energy loss during the arc transition, ensures the arc quickly enters the arc extinguishing system, and avoids arc "jumping" or "stagnation" caused by excessive angular deviation between the two. This improves the arc transfer success rate and reduces the risk of contact burnout.

[0049] As an implementation method, the arc striking grid 40 is made of a conductive material.

[0050] It should be noted that the arc-striking grid 40 is made of a conductive material (such as copper alloy or copper-tungsten alloy). The conductive properties of the arc-striking grid 40 enable it to maintain the same potential as the static contact 12 (because the first end is connected to the static contact 12). When the moving contact 11 is opened to generate an arc, the potential difference between the two ends of the arc (the moving contact 11 and the static contact 12) will drive the arc to move toward the arc-striking grid 40 with the same potential. Because the conductive material can form a low-resistance path, the arc is more likely to adhere to the surface of the arc-striking grid 40 rather than stay on the static contact 12 or the moving contact 11, thereby avoiding the arc burning the static contact 12 for a long time and reducing contact ablation loss. The second end of the arc-striking grid 40 is adjacent to and parallel to the first sub-grid 221 close to the static contact 12. Although the two are not directly connected, they are both conductors, forming a continuous electric field gradient of "static contact 12, arc-striking grid 40, and first sub-grid 221". In the field composed of conductive materials, the arc will migrate along the surface of the arc-striking grid 40 toward the first sub-grid 221, and finally enter the first sub-chamber 211 and be divided and extinguished by the arc extinguishing grid 22, thereby solving the problem of arc extinguishing delay caused by arc drift in the traditional structure.

[0051] As an implementable embodiment, the arc extinguishing mechanism also includes an arc-striking piece 50, which is arranged on the movement path of the moving contact 11, and the arc-striking piece 50 is located on the side of the installation chamber 21 away from the static contact 12. When the moving contact 11 moves toward the side away from the static contact 12, the arc-striking piece 50 can be clamped and contacted with the moving contact 11.

[0052] It should be noted that the arc-striking piece 50 can be made of arc-resistant material (such as graphite or copper-tungsten alloy) and has a blade-shaped structure. The arc-striking piece 50 can be fixedly installed on the movement trajectory of the moving contact 11, and the arc-striking piece 50 is located on the side of the installation chamber 21 away from the static contact 12. When the switch unit 100 is closed, the operating mechanism drives the moving contact 11 to move toward the side close to the static contact 12, so that the moving contact 11 and the static contact 12 are in contact and pressed, thereby completing the conduction of the circuit; when the switch unit 100 is opened, the operating mechanism drives the moving contact 11 to move toward the side away from the static contact 12. First, the static contact 12 separates from the static contact 12 to form an arc. Then, the moving contact 11 continues to move to the position of the arc striking piece 50. The arc striking piece 50 can be clamped and contacted with the moving contact 11. For example, the arc striking piece 50 can be clamped and contacted by the moving contact 11, or the moving contact 11 can be clamped and contacted by the arc striking piece 50. On the one hand, the arc on the moving contact 11 is transferred to the arc striking piece 50 and then enters the arc extinguishing mechanism, and no longer burns the moving contact 11. On the other hand, the friction force and structural resistance hinder the moving contact 11 from continuing to move, so that the movement speed of the moving contact 11 is reduced, and finally it stops smoothly under the action of the arc striking piece 50. During the above process, the arc striking piece 50 can prevent the arc from staying on the moving contact 11 and burning the moving contact 11 and can also absorb the kinetic energy of the moving contact 11 to prevent it from rebounding after hitting the limit part on the housing due to inertia.

[0053] Compared with the prior art, the switch unit 100 provided in the present application realizes opening and closing control through the mutual cooperation of the moving contact 11 and the static contact 12, and also realizes the clamping contact cooperation between the moving contact 11 and the arc-striking piece 50, so that the arc-striking piece 50 can play a buffering role for the opening movement of the moving contact 11, thereby solving the rebound problem of the moving contact 11 when opening and the burning problem of the moving contact 11, ensuring that the opening distance between the moving contact 11 and the static contact 12 is within a safe range, thereby improving the safety of the product.

[0054] As an implementable embodiment, the moving contact 11 includes a contact bracket 112 and two moving contact pieces 111 arranged at intervals. The contact bracket 112 is driven to move the two moving contact pieces 111 so that the two moving contact pieces 111 respectively clamp the opposite sides of the arc-striking piece 50. The arc-striking piece 50 is made of conductive material, and the arc-striking piece 50 is used to transfer the arc on the moving contact 11 to the installation chamber 21.

[0055] It should be noted that the arc-striking piece 50 can be made of a conductive arc-resistant material (such as copper-tungsten alloy), which not only maintains arc resistance but also has good conductivity, so that the arc on the movable contact 11 can be transferred to the installation chamber 21 through the arc-striking piece 50. The movable contact 11 includes a contact bracket 112 and two movable contact pieces 111 spaced apart on the contact bracket 112. The contact bracket 112 can be connected to the operating mechanism via a rotating shaft so that the contact bracket 112 can rotate around the rotating shaft. There are two movable contact pieces 111, which are spaced apart and installed in parallel on the contact bracket 112. When the switch unit 100 switches from the closed state to the open state, the operating mechanism drives the contact 11 bracket to rotate around the rotating shaft, driving the two moving contact pieces 111 to rotate synchronously, gradually moving away from the static contact 12. As the moving contact piece 111 rotates, it gradually approaches the arc-striking piece 50. Finally, the arc-striking piece 50 can be clamped by the two moving contact pieces 111, or in other words, the two moving contact pieces 111 contact the opposite sides of the arc-striking piece 50 from opposite sides of the arc-striking piece 50 and clamp the arc-striking piece 50. When clamping, the moving contact piece 111 is tightly fitted with the surface of the arc-striking piece 50, forming a conductive connection and limiting the further rotation of the moving contact 11 through friction. When closing the switch, the contact bracket 112 rotates in the opposite direction, driving the moving contact piece 111 to separate from the arc-striking piece 50, gradually approaching the static contact 12, and finally achieving contact.

[0056] When the switch unit 100 is opened, the moving contact 11 and the static contact 12 are separated, and an arc is generated between them. At this time, the arc mainly burns between the moving contact 11 and the static contact 12. Subsequently, the moving contact 11 continues to move toward the side away from the static contact 12. When the moving contact 11 contacts the arc-strike piece 50, because the arc-strike piece 50 is made of conductive material and has the same potential as the moving contact 11, the arc is affected by the "near cathode effect" and the magnetic field force (if the installation chamber 21 contains a magnetic blow coil), and is transferred from the surface of the moving contact 11 to the surface of the arc-strike piece 50. In this way, the arc can be guided into the installation chamber 21 through the arc-strike piece 50, and the arc can be effectively extinguished by the installation chamber 21, preventing the arc from staying on the moving contact 11 and burning the moving contact 11.

[0057] In this embodiment, the symmetrical clamping structure of the two moving contact pieces 111 ensures balanced force on the arc striking piece 50, avoids positional deviation caused by unilateral force, and ensures a stable arc transfer path. During clamping, the moving contact piece 111 is in close contact with the surface of the arc striking piece 50. Therefore, the arc on the moving contact 11 can be smoothly transferred to the arc striking piece 50, and then introduced into the mounting chamber 21 through the arc striking piece 50, thereby achieving efficient arc transfer and extinguishing.

[0058] The embodiment of the present application further provides a disconnector or double power transfer switch, comprising a handle, an operating mechanism and the switch unit 100, the number of the switch unit 100 is multiple, the multiple switch units 100 and the operating mechanism are sequentially stacked, the handle is drivingly connected with the movable contact 11 of the multiple switch units 100 through the operating mechanism, and the handle is used for driving the operating mechanism to move, so as to drive the movable contact 11 of the multiple switch units 100 to move synchronously. Since the structure and beneficial effects of the switch unit 100 have been described in detail in the foregoing embodiment, they will not be described here again.

[0059] The above only describes optional embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0060] In addition, it should be noted that each specific technical feature described in the foregoing specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, various possible combinations will not be described again in the present application.

Claims

1. A switch unit, characterized in that: The invention comprises a contact mechanism and an arc extinguishing mechanism arranged on one side of the contact mechanism, wherein the contact mechanism comprises a moving contact (11) and a static contact (12), wherein the moving contact (11) moves relative to the static contact (12) to form a movement path for cooperating with the static contact (12) in opening and closing operations, and wherein the arc extinguishing mechanism comprises an installation chamber (21), an arc extinguishing grid (22) and a conductive grid (23), and along the movement path of the moving contact (11), the installation chamber (21) is divided into a first sub-chamber (211) on a side close to the static contact (12). and a second sub-chamber (212) on a side away from the static contact (12), the arc-extinguishing grid (22) comprising a first sub-grid (221) located in the first sub-chamber (211) and a second sub-grid (222) located in the second sub-chamber (212); the conductive grid (23) is connected to the first sub-grid (221) and extends toward the second sub-chamber (212), and / or the conductive grid (23) is connected to the second sub-grid (222) and extends toward the first sub-chamber (211).

2. The switch unit according to claim 1, characterized in that The number of the conductive grid sheet (23) is one, and the conductive grid sheet (23) is connected to the first sub-grid sheet (221) and extends toward the second sub-grid sheet (222), or the conductive grid sheet (23) is connected to the second sub-grid sheet (222) and extends toward the first sub-grid sheet (221).

3. The switch unit according to claim 1, characterized in that The number of the conductive grids (23) is at least two, one conductive grid (23) is connected to the first sub-grid (221) and extends toward the second sub-grid (222), and the other conductive grid (23) is connected to the second sub-grid (222) and extends toward the first sub-grid (221), and the two conductive grids (23) distributed along the movement direction of the moving contact (11) are arranged at intervals.

4. The switch unit according to any one of claims 1 to 3, characterized in that: The invention also includes a housing (30), wherein the conductive grid (23) is located on a side of the installation chamber (21) facing away from the moving contact (11), and the conductive grid (23) includes a connecting section (231) connected to the first sub-grid (221) and / or the second sub-grid (222) and an extension section (232) extending along the arrangement direction (A) of the arc-extinguishing grid (22). A first rib (31) is provided on the housing (30), and the first rib (31) is located between the arc-extinguishing grid (22) and the extension section (232), and a projection of the first rib (31) along the extension direction (B) of the arc-extinguishing grid (22) covers a projection of the extension section (232) along the extension direction (B) of the arc-extinguishing grid (22).

5. The switch unit according to claim 4, characterized in that The number of the conductive grids (23) is at least two, and the housing (30) is further provided with a second rib (32), which is located between two conductive grids (23) distributed along the movement direction of the moving contact (11).

6. The switch unit according to any one of claims 1 to 3, characterized in that: The surface of the conductive grid (23) is covered with an insulating sheath.

7. The switch unit according to any one of claims 1 to 3, characterized in that: The first sub-grid (221) comprises an arc-striking grid (40), wherein a first end of the arc-striking grid (40) is connected to the static contact (12), and a second end of the arc-striking grid (40) is connected to the conductive grid (23).

8. The switch unit according to claim 1, characterized in that The arc extinguishing mechanism further includes an arc-striking piece (50), which is arranged on the movement path of the moving contact (11), and the arc-striking piece (50) is located on the side of the installation chamber (21) away from the static contact (12). When the moving contact (11) moves toward the side away from the static contact (12), the arc-striking piece (50) can be clamped and contacted with the moving contact (11).

9. The switch unit according to claim 8, characterized in that The moving contact (11) includes a contact bracket (112) and two moving contact pieces (111) arranged at intervals. The contact bracket (112) is driven to move the two moving contact pieces (111) so that the two moving contact pieces (111) respectively clamp the opposite sides of the arc-striking piece (50). The arc-striking piece (50) is made of conductive material. The arc-striking piece (50) is used to transfer the arc on the moving contact (11) to the installation chamber (21).

10. An isolating switch or a dual power transfer switch, characterized in that: The invention comprises a handle, an operating mechanism and a switch unit (100) according to any one of claims 1 to 9, wherein the number of the switch units (100) is plural, and the plurality of switch units (100) and the operating mechanism are stacked in sequence, and the handle is driven and connected to the movable contacts (11) of the plurality of switch units (100) through the operating mechanism, and the handle is used to drive the operating mechanism to move, so as to drive the movable contacts (11) of the plurality of switch units (100) to move synchronously.

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