Moving contact structure, contact system and isolating switch

Abstract

The invention discloses a moving contact structure, a contact system and an isolating switch, and relates to the field of low-voltage electric appliances. The invention provides a moving contact structure. The moving contact structure comprises a contact support, a first contact and a second contact, wherein the first contact and the second contact are coaxially arranged on the contact support side by side; the first contact can be electrically connected with a static contact of the contact system in a clapping manner, and the second contact can be electrically connected with the static contact of the contact system in a clamping manner; or, the first contact can be electrically connected with the static contact of the contact system in a clamping manner, and the second contact can be electrically connected with the static contact of the contact system in a clapping manner. According to the moving contact structure obtained by the above design, the short-time withstand current performance can be improved through the first contact or the second contact which is connected in a clamping manner when the arc voltage is increased, so that the moving contact structure is prevented from being burnt, the reliability of the moving contact structure is improved, and the service life of the moving contact structure is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and more particularly, to a moving contact structure, a contact system, and a disconnector. Background Art

[0002] In the existing field of low-voltage electrical appliances, the DC voltage can only reach DC1500V, and DC1500V products can no longer meet customer needs, so an update is urgently needed. In the existing disconnector, usually after the contacts are opened, the arc enters the arc extinguishing chamber for arc extinguishing. The extinction of the arc is directly related to the arc voltage, and the number of arc extinguishing grid plates in the arc extinguishing chamber determines the strength of the arc voltage. The more grid plates, the stronger the arc voltage. Therefore, to increase the DC voltage value, the number of arc extinguishing grid plates needs to be increased.

[0003] The moving contact of the existing disconnector usually includes a single main contact plate. As the DC voltage increases, the arc voltage increases when the moving and static contacts come into contact, and the short-time withstand capacity of the existing moving contact is insufficient. Therefore, a new moving contact structure needs to be provided to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a moving contact structure, a contact system, and a disconnector, which can improve the short-time withstand current performance by the first contact or the second contact connected in a clamping manner when the arc voltage increases, so as to improve the reliability and service life of the moving contact structure.

[0005] The embodiments of the present invention are implemented as follows:

[0006] In one aspect of the present invention, a moving contact structure is provided, which includes a contact support and a first contact and a second contact arranged coaxially and side by side on the contact support; the first contact can be electrically connected to the static contact of the contact system in a clapping manner, and the second contact can be electrically connected to the static contact of the contact system in a clamping manner; alternatively, the first contact can be electrically connected to the static contact of the contact system in a clamping manner, and the second contact can be electrically connected to the static contact of the contact system in a clapping manner.

[0007] Optionally, the first contact is the main contact, and the second contact is the arc contact, and the arc contact is arranged between the two main contacts.

[0008] Optionally, when the moving contact structure is driven to move towards the static contact of the contact system, the arc contact contacts the static contact before the main contact; when the moving contact structure is driven to move away from the static contact of the contact system, the arc contact separates from the static contact after the main contact.

[0009] Optionally, the main contact includes a plurality of piece-shaped main contact plates arranged side by side, and the arc contact includes two piece-shaped arc contact plates arranged at intervals; the two piece-shaped arc contact plates are respectively subjected to the clamping forces of the piece-shaped main contact plates of the adjacent main contacts, and the directions of the two clamping forces are opposite.

[0010] Optionally, the length of the segmented arc contact plate in the extending direction is less than the length of the segmented main contact plate in the extending direction.

[0011] Optionally, the moving contact structure further includes an insulating partition, which is arranged between the main contact and the arc contact. There is a preset interval between the two insulating partitions, and the arc contact is arranged within the preset interval.

[0012] On the other hand, the present invention provides a contact system, which includes a static contact and the above-mentioned moving contact structure. An active contact is provided on the first contact of the moving contact structure, and an arc moving contact is provided on the second contact; a main static contact and an arc static contact are correspondingly provided on the static contact. The active contact can be connected to the main static contact, and the arc moving contact can be connected to the arc static contact.

[0013] Optionally, the opening distance between the active contact and the main static contact is greater than the opening distance between the arc moving contact and the arc static contact.

[0014] On the other hand, the present invention provides a disconnector, which includes a housing and the above-mentioned contact system, and the contact system is arranged inside the housing.

[0015] Optionally, an arc extinguishing chamber is provided inside the housing, and a preset number of arc extinguishing grid sheets are provided inside the arc extinguishing chamber.

[0016] The beneficial effects of the present invention include:

[0017] The moving contact structure provided by the present application includes a contact support and a first contact and a second contact arranged coaxially and side by side on the contact support; the first contact can be electrically connected to the static contact of the contact system in a clapping manner, and the second contact can be electrically connected to the static contact of the contact system in a clamping manner; alternatively, the first contact can be electrically connected to the static contact of the contact system in a clamping manner, and the second contact can be electrically connected to the static contact of the contact system in a clapping manner. The moving contact structure obtained by the above design can improve the short-time withstand current performance through the first contact or the second contact with a clamping connection when the arc voltage increases, so as to avoid being burned, and improve the reliability and service life of the moving contact structure.

[0018] The contact system provided by the present application includes a static contact and the above-mentioned moving contact structure. An active contact is provided on the first contact of the moving contact structure, and an arc moving contact is provided on the second contact; a main static contact and an arc static contact are correspondingly provided on the static contact. The active contact can be connected to the main static contact, and the arc moving contact can be connected to the arc static contact. The contact system obtained by the above design can also have good short-time withstand current performance when the arc voltage increases, has good reliability, and also extends the service life.

[0019] The disconnecting switch provided by the present application includes a housing and the above-mentioned contact system. The contact system is arranged inside the housing, and the housing can provide a certain protection function for the contact system. The disconnecting switch obtained by the above design can have good short-time withstand current performance even when the arc voltage increases, has good reliability, and also extends the service life. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 One of the structural schematic diagrams of the contact system provided by the embodiment of the present invention;

[0022] Figure 2 Another structural schematic diagram of the contact system provided by the embodiment of the present invention;

[0023] Figure 3 A cross-sectional view of the moving contact structure provided by the embodiment of the present invention;

[0024] Figure 4 One of the structural schematic diagrams of the moving contact structure provided by the embodiment of the present invention;

[0025] Figure 5 A structural schematic diagram when the arc moving contact and the arc static contact are closed in the embodiment of the present invention;

[0026] Figure 6 Another structural schematic diagram of the contact system provided by the embodiment of the present invention.

[0027] Reference Signs: 100 - moving contact structure; 110 - contact support; 120 - main contact; 121 - segmented main contact plate; 122 - active contact; 130 - arc contact; 131 - segmented arc contact plate; 132 - arc moving contact; 140 - insulating partition; 200 - contact system; 210 - static contact; 211 - main static contact; 212 - arc static contact. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0030] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0032] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] Please refer to Figure 1 , this embodiment provides a moving contact structure 100, including a contact support 110 and a first contact and a second contact coaxially arranged side by side on the contact support 110; the first contact can be in snap-on electrical connection with the static contact 210 of the contact system 200, and the second contact can be in clamping electrical connection with the static contact 210 of the contact system 200; or, the first contact can be in clamping electrical connection with the static contact 210 of the contact system 200, and the second contact can be in snap-on electrical connection with the static contact 210 of the contact system 200.

[0035] Specifically, the present application provides a moving contact structure 100. The moving contact structure 100 includes a contact support 110, and a first contact and a second contact respectively arranged on the contact support 110. The contact support 110 can provide a certain supporting force for the first contact and the second contact; the ends of the first contact and the second contact are coaxial and arranged side by side, so as to be able to move synchronously towards or away from the static contact 210 when the contact system 200 is closed or opened.

[0036] Wherein, the first contact can be in a clapping electrical connection with the static contact 210 of the contact system 200, and the second contact can be in a clamping electrical connection with the static contact 210 of the contact system 200; alternatively, the first contact can be in a clamping electrical connection with the static contact 210 of the contact system 200, and the second contact can be in a clapping electrical connection with the static contact 210 of the contact system 200. The clamping electrical connection method has a relatively high short-time withstand capacity, and the contacts in the clamping electrical connection have a higher contact pressure, which is more beneficial to the short-time withstand current performance.

[0037] It should be noted that, as Figure 3 shown, in the embodiment of the present application, the first contact is the main contact 120, and the second contact is the arcing contact 130. The arcing contact 130 is arranged between the two main contacts 120. The first contact is the main contact 120 for contacting the static contact 210 to realize the closing of the main circuit of the low-voltage electrical appliance; the second contact is the arcing contact 130, and the high-voltage arc can be concentrated on the arcing contact 130 and introduced into the arc extinguishing chamber of the disconnector for arc extinguishing. In a preferred solution of the present application, the arcing contact 130 is a contact in a clamping electrical connection, and the main contact 120 is a contact in a clapping electrical connection, that is, a clamping electrical connection arcing contact 130 is arranged between the two clapping electrical connection main contacts 120; of course, in addition to the above solution, the moving contact structure 100 of the present application can also be set such that the arcing contact 130 is a contact in a clapping electrical connection, and the main contact 120 is a contact in a clamping electrical connection, that is, a clapping electrical connection arcing contact 130 is arranged between the two clamping electrical connection main contacts 120, as Figure 2 shown. The present application does not impose any restrictions on the specific electrical connection methods of the main contact 120 and the arcing contact 130 of the moving contact structure 100.

[0038] The moving contact structure 100 provided by this application includes a contact support 110, and a first contact and a second contact arranged coaxially and side by side on the contact support 110; the first contact can be in snap-on electrical connection with the static contact 210 of the contact system 200, and the second contact can be in clamping electrical connection with the static contact 210 of the contact system 200; alternatively, the first contact can be in clamping electrical connection with the static contact 210 of the contact system 200, and the second contact can be in snap-on electrical connection with the static contact 210 of the contact system 200. With the above design, the moving contact structure 100 can improve the short-time withstand current performance through the first contact or the second contact with clamping connection when the arc voltage increases, so as to avoid being burned and improve the reliability and service life of the moving contact structure 100.

[0039] Further, when the moving contact structure 100 is driven to move towards the static contact 210 of the contact system 200, the arcing contact 130 contacts the static contact 210 before the main contact 120; when the moving contact structure 100 is driven to move away from the static contact 210 of the contact system 200, the arcing contact 130 separates from the static contact 210 after the main contact 120.

[0040] Specifically, the moving contact structure 100 of this application can be driven to move towards or away from the static contact 210 of the contact system 200 to contact and close with the static contact 210 or separate and open from the static contact 210. Among them, when the moving contact structure 100 is driven to move towards the static contact 210 of the contact system 200, the arcing contact 130 can first contact the static contact 210, and then the moving contact contacts the static contact 210; when the moving contact structure 100 is driven to move away from the static contact 210 of the contact system 200, the moving contact can first separate from the static contact 210, and then the arcing contact 130 separates from the static contact 210.

[0041] Through such a setting method, during the closing or opening process of the moving contact structure 100 and the static contact 210, the arcing contact 130 contacts and then separates from the static contact 210, so that the arc is initiated on the arcing contact 130 and finally concentrated on the arcing contact 130 to be extinguished by the arc extinguishing chamber, thereby protecting the moving contact structure 100 from being burned by the arc and improving the reliability and service life of the moving contact structure 100.

[0042] In an implementable manner of this application, the main contact 120 includes multiple piece-shaped main contact plates 121 arranged side by side, and the arcing contact 130 includes two piece-shaped arcing contact plates 131 arranged at intervals; the two piece-shaped arcing contact plates 131 are respectively subjected to the clamping forces of the adjacent piece-shaped main contact plates 121 of the main contact 120, and the directions of the two clamping forces are opposite.

[0043] Specifically, as Figure 6As shown, the main contact 120 is composed of a plurality of sharded main contact plates 121 arranged side by side. The arcing contact 130 includes two sharded arcing contact plates 131. There is a certain gap between the two sharded arcing contact plates 131, so that the two sharded arcing contact plates 131 can clamp the arcing contact point of the static contact 210 through the gap to achieve good electrical connection.

[0044] As Figure 5 shown, since the arcing contact 130 is arranged between the two main contacts 120, the two sharded contact plates can respectively receive the clamping forces from the sharded main contact plates 121 of the main contact 120 on the adjacent side. The two clamping forces received by the two sharded contact plates are in opposite directions and both face the opposite direction. When the current increases, the two clamping forces received by the two sharded contact plates gradually increase, which is more conducive to improving the short-time withstand current performance of the moving contact structure 100.

[0045] It should be noted that when the arcing contact 130 clamps with the static contact 210, it receives the repulsive force generated by the static contact 210 when it is pressed by the mechanism spring. The direction of the repulsive force is opposite to the direction of the pressure of the arcing contact 130 pressing down the static contact 210. The two sharded contact plates of the present application clamp the arcing static contact point 212 of the static contact 210 in a clamping electrical connection manner, so the repulsive force is small, which further improves the short-time withstand current performance of the moving contact.

[0046] Furthermore, the length of the sharded arcing contact plate 131 along the extension direction is less than the length of the sharded main contact plate 121 along the extension direction. Wherein, the extension direction of the arcing contact 130 plate is the plate length direction of the arcing contact 130 plate, and the extension direction of the main contact plate is the plate length direction of the main contact plate. By such a setting method, the force arm of the arcing contact 130 plate is smaller than that of the main contact 120 plate. Therefore, in the process of clamping and connecting with the arcing static contact point 212 of the static contact 210, the actual generated force is also smaller, which further reduces the repulsive force when electrically connecting with the static contact 210 and further improves the short-time withstand current performance of the moving contact.

[0047] In an implementable embodiment of the present application, the moving contact structure 100 further includes an insulating partition 140. The insulating partition 140 is arranged between the main contact 120 and the arcing contact 130. There is a preset gap between the two insulating partitions 140, and the arcing contact 130 is arranged within the preset gap.

[0048] Specifically, as Figure 4As shown, the moving contact structure 100 further includes an insulating partition 140. Preferably, the length of the insulating partition 140 is greater than or equal to the length of the main contact plate to ensure good insulation. The insulating partition 140 is disposed between the main contact 120 and the arcing contact 130 to prevent arcing breakdown between the main contact 120 and the arcing contact 130 from left to right, further improving the reliability of the moving contact structure 100 and extending its service life. A preset interval is provided between the two insulating partitions 140 to form a narrow slit, and the arcing contact 130 is disposed within the preset interval to improve the breaking and critical current capabilities.

[0049] In another aspect of the embodiments of the present application, a contact system 200 is further provided, which includes a stationary contact 210 and the above-mentioned moving contact structure 100. An active contact 122 is provided on the first contact of the moving contact structure 100, and an arcing moving contact 132 is provided on the second contact. Corresponding main stationary contact 211 and arcing stationary contact 212 are provided on the stationary contact 210. The active contact 122 can be connected to the main stationary contact 211, and the arcing moving contact 132 can be connected to the arcing stationary contact 212.

[0050] Specifically, the present application further provides a contact system 200, which includes a moving contact structure 100 and a stationary contact 210. The moving contact structure 100 can contact or separate from the stationary contact 210. The moving contact structure 100 includes a first contact and a second contact. An active contact 122 is provided on the first contact, and an arcing moving contact 132 is provided on the second contact. Correspondingly, a main stationary contact 211 and an arcing stationary contact 212 are provided on the stationary contact 210. The positions of the main stationary contact 211 and the arcing stationary contact 212 are respectively adapted to the active contact 122 and the arcing moving contact 132. The main stationary contact 211 can be a flat surface for clapping or a convex portion for clamping for clapping or clamping. The arcing stationary contact 212 can be a flat surface for clapping or a convex portion for clamping for clapping or clamping. Among them, the specific structure and beneficial effects of the moving contact structure 100 have been introduced in detail above and will not be elaborated here.

[0051] The contact system 200 provided by the present application includes a stationary contact 210 and the above-mentioned moving contact structure 100. An active contact 122 is provided on the first contact of the moving contact structure 100, and an arcing moving contact 132 is provided on the second contact. Corresponding main stationary contact 211 and arcing stationary contact 212 are provided on the stationary contact 210. The active contact 122 can be connected to the main stationary contact 211, and the arcing moving contact 132 can be connected to the arcing stationary contact 212. The contact system 200 obtained by the above design can also have good short-time withstand current performance when the arc voltage increases, has good reliability, and also extends the service life.

[0052] Furthermore, the opening distance between the moving main contact 122 and the static main contact 211 is greater than the opening distance between the moving arcing contact 132 and the static arcing contact 212. By setting it in this way, it can be ensured that when the moving contact structure 100 moves towards the static contact 210, since the opening distance of the moving arcing contact 132 is smaller than that of the moving main contact 122, it can be ensured that the moving arcing contact 132 makes contact with the static arcing contact 212 of the static contact 210 first and then separates from the static arcing contact 212 of the static contact 210.

[0053] On the other hand, an embodiment of the present application further provides a disconnector (not shown in the figure), which includes a housing and the above-mentioned contact system 200, and the contact system 200 is arranged inside the housing. The housing can provide a certain protection for the contact system 200 inside it. Among them, the specific structure and beneficial effects of the contact system 200 have been introduced in detail above and will not be elaborated here. The disconnector obtained by the above design can also have good short-time withstand current performance when the arc voltage increases, has good reliability, and also extends the service life.

[0054] Furthermore, an arc extinguishing chamber is provided inside the housing, and a preset number of arc extinguishing grid plates are provided inside the arc extinguishing chamber.

[0055] Specifically, an arc extinguishing chamber is also provided inside the housing of the disconnector, and arc extinguishing grid plates are arranged inside the arc extinguishing chamber. The number of arc extinguishing grid plates can be increased or decreased according to the actual requirements of the DC power supply size, which plays a role in cutting the arc and is used to extinguish the arc generated when the contact system 200 is opened and closed, so as to ensure the reliability and safety of the disconnector.

[0056] The above are only optional embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0057] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

Claims

1. A moving contact structure, characterized in that, It includes a contact support (110), a first contact and a second contact arranged side by side on the contact support (110); the first contact can be in snap-on electrical connection with the static contact (210) of the contact system (200), and the second contact can be in clamping electrical connection with the static contact (210) of the contact system (200); or, the first contact can be in clamping electrical connection with the static contact (210) of the contact system (200), and the second contact can be in snap-on electrical connection with the static contact (210) of the contact system (200).

2. The moving contact structure according to claim 1, characterized in that, The first contact is the main contact (120), the second contact is the arcing contact (130), and the arcing contact (130) is arranged between the two main contacts (120).

3. The moving contact structure according to claim 2, wherein, When the moving contact structure (100) is driven to move towards the static contact (210) of the contact system (200), the arcing contact (130) contacts the static contact (210) before the main contact (120); when the moving contact structure (100) is driven to move away from the static contact (210) of the contact system (200), the arcing contact (130) separates from the static contact (210) after the main contact (120).

4. The moving contact structure according to claim 2, characterized in that, The main contact (120) includes multiple piece-shaped main contact plates (121) arranged side by side, and the arcing contact (130) includes two piece-shaped arcing contact plates (131) arranged at intervals; the two piece-shaped arcing contact plates (131) are respectively subjected to the clamping forces of the adjacent piece-shaped main contact plates (121) of the main contact (120), and the directions of the two clamping forces are opposite.

5. The moving contact structure according to claim 4, characterized in that, The length of the piece-shaped arcing contact plate (131) in the extending direction is less than the length of the piece-shaped main contact plate (121) in the extending direction.

6. The moving contact structure according to claim 2, characterized in that The moving contact structure (100) further includes an insulating partition (140), the insulating partition (140) is arranged between the main contact (120) and the arcing contact (130), there is a preset interval between the two insulating partitions (140), and the arcing contact (130) is arranged within the preset interval.

7. A contact system, characterized in that, It includes a static contact (210) and the moving contact structure (100) according to any one of claims 1-6 above. An active contact (122) is provided on the first contact of the moving contact structure (100), and an arcing moving contact (132) is provided on the second contact; a main static contact (211) and an arcing static contact (212) are correspondingly provided on the static contact (210), the active contact (122) can be connected to the main static contact (211), and the arcing moving contact (132) can be connected to the arcing static contact (212).

8. The contact system according to claim 7, characterized in that, The opening distance between the active contact (122) and the main static contact (211) is greater than the opening distance between the arcing moving contact (132) and the arcing static contact (212).

9. An isolating switch, characterized in that, It includes a housing and the contact system (200) according to any one of claims 7-8 above, and the contact system (200) is arranged within the housing.

10. The disconnector according to claim 9, characterized in that, An arc extinguishing chamber is provided within the housing, and a preset number of arc extinguishing grid plates are provided within the arc extinguishing chamber.

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