Moving contact structure, contact system and isolating switch

Abstract

The utility model discloses a moving contact structure, a contact system and an isolating switch, and relates to the field of low-voltage electric appliances. The utility model 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 utility model relates to the field of low-voltage electrical appliances, and in particular to a moving contact structure, a contact system and an isolating switch. Background Art

[0002] In the existing low-voltage electrical field, direct current can only reach DC1500V, and DC1500V products can no longer meet customer needs and are in urgent need of replacement. In existing isolating switches, the arc is usually extinguished by the arc entering the arc extinguishing chamber after the contacts are opened. The extinguishing of the arc is directly related to the arc voltage, and the number of arc extinguishing grids in the arc extinguishing chamber determines the strength of the arc voltage. The more grids, the stronger the arc voltage. Therefore, to increase the DC voltage value, the number of arc extinguishing grids needs to be increased.

[0003] The moving contact of the existing isolating switch usually includes a single main contact plate. As the DC voltage increases, the arc voltage when the moving and static contacts contact increases. The short-circuit withstand capacity of the existing moving contact is insufficient. Therefore, it is necessary to provide a new moving contact structure to solve the above problem. Utility Model Content

[0004] The purpose of the utility model is to provide a moving contact structure, a contact system and an isolating switch, which can improve the short-time current withstand performance through 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 embodiment of the utility model is achieved as follows:

[0006] One aspect of the utility model provides a moving contact structure, including a contact support and a first contact and a second contact coaxially arranged side by side on the contact support; the first contact can be electrically connected to a stationary contact of a contact system by a snap-fitting manner, and the second contact can be electrically connected to a stationary contact of the contact system by a clamping manner; or, the first contact can be electrically connected to a stationary contact of the contact system by a clamping manner, and the second contact can be electrically connected to a stationary contact of the contact system by a snap-fitting manner.

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

[0008] Optionally, when the moving contact structure is driven to move toward 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 toward the static contact away from the contact system, the arc contact separates from the static contact after the main contact.

[0009] Optionally, the main contact includes a plurality of segmented main contact plates arranged side by side, and the arc contact includes two segmented arc contact plates arranged at intervals; the two segmented arc contact plates are respectively subjected to the clamping force of the segmented 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 along the extension direction is smaller than the length of the segmented main contact plate along the extension direction.

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

[0012] Another aspect of the utility model provides a contact system, which includes a static contact and the above-mentioned moving contact structure, wherein 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] Another aspect of the present invention provides an isolating switch, which comprises a housing and the above-mentioned contact system, wherein the contact system is arranged in the housing.

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

[0016] The beneficial effects of the utility model include:

[0017] The movable contact structure provided by the present application includes a contact support and a first contact and a second contact coaxially arranged side by side on the contact support; the first contact can be electrically connected to the static contact of the contact system by snapping, and the second contact can be electrically connected to the static contact of the contact system by clamping; or, the first contact can be electrically connected to the static contact of the contact system by clamping, and the second contact can be electrically connected to the static contact of the contact system by snapping. The movable contact structure obtained by the above design can improve the short-time withstand current performance through the first contact or the second contact connected by clamping when the arc voltage increases, so as to avoid burning, thereby improving the reliability and service life of the movable contact structure.

[0018] The contact system provided by the present application includes a static contact and the above-mentioned moving contact structure, wherein the first contact of the moving contact structure is provided with an active contact, and the second contact is provided with an arc moving contact; the static contact is provided with a main static contact and an arc static contact, and 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 current tolerance performance when the arc voltage increases, has good reliability, and also prolongs the service life.

[0019] The isolating switch provided by the present application comprises a housing and the above-mentioned contact system, wherein the contact system is arranged in the housing, and the housing can provide a certain protection for the contact system. The isolating switch obtained by the above-mentioned design can also have good short-time current tolerance performance when the arc voltage increases, has good reliability, and also prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

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

[0022] Figure 2 The second structural diagram of the contact system provided by the embodiment of the utility model;

[0023] Figure 3 A cross-sectional view of a moving contact structure provided in an embodiment of the utility model;

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

[0025] Figure 5 A schematic diagram of the structure of the arc moving contact and the arc static contact when they are closed provided by an embodiment of the utility model;

[0026] Figure 6 The third structural schematic diagram of the contact system provided in the embodiment of the utility model.

[0027] Icon: 100-moving contact structure; 110-contact bracket; 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 DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, 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 present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

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

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Please refer to Figure 1 The present 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 electrically connected to the stationary contact 210 of the contact system 200 in a snap-fit ​​manner, and the second contact can be electrically connected to the stationary contact 210 of the contact system 200 in a clamping manner; or, the first contact can be electrically connected to the stationary contact 210 of the contact system 200 in a clamping manner, and the second contact can be electrically connected to the stationary contact 210 of the contact system 200 in a snap-fit ​​manner.

[0035] Specifically, the present application provides a moving contact structure 100, which includes a contact bracket 110 and a first contact and a second contact respectively arranged on the contact bracket 110, and the contact bracket 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 that they can move synchronously toward or away from the static contact 210 when the contact system 200 is closed or opened.

[0036] The first contact can be electrically connected to the stationary contact 210 of the contact system 200 by snapping, and the second contact can be electrically connected to the stationary contact 210 of the contact system 200 by clamping; or, the first contact can be electrically connected to the stationary contact 210 of the contact system 200 by clamping, and the second contact can be electrically connected to the stationary contact 210 of the contact system 200 by snapping. The clamping electrical connection has a higher short-term withstand capability, and the contacts of the clamping electrical connection have a higher contact pressure, which is more conducive to the short-term withstand current performance.

[0037] It should be noted that if Figure 3 As shown, in the embodiment of the present application, the first contact is a main contact 120, and the second contact is an arc contact 130, and the arc contact 130 is arranged between the two main contacts 120. The first contact is the main contact 120, which is used to contact with the static contact 210 to achieve the closing of the main circuit of the low-voltage electrical appliance; the second contact is the arc contact 130, and the high-voltage arc can be concentrated on the arc contact 130 and introduced into the arc extinguishing chamber of the disconnector for arc extinguishing. In a preferred embodiment of the present application, the arc contact 130 is a contact for clamping electrical connection, and the main contact 120 is a contact for snapping electrical connection, that is, an arc contact 130 for clamping electrical connection is arranged between two main contacts 120 for snapping electrical connection; of course, in addition to the above embodiment, the movable contact structure 100 of the present application can also be arranged that the arc contact 130 is a contact for snapping electrical connection, and the main contact 120 is a contact for clamping electrical connection, that is, an arc contact 130 for snapping electrical connection is arranged between two main contacts 120 for snapping electrical connection, such as Figure 2 The present application does not impose any limitation on the specific electrical connection method of the main contact 120 and the arc contact 130 of the movable contact structure 100.

[0038] The movable contact structure 100 provided in the present application comprises 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 electrically connected to the stationary contact 210 of the contact system 200 in a snap-fit ​​manner, and the second contact can be electrically connected to the stationary contact 210 of the contact system 200 in a clamping manner; or, the first contact can be electrically connected to the stationary contact 210 of the contact system 200 in a clamping manner, and the second contact can be electrically connected to the stationary contact 210 of the contact system 200 in a snap-fit ​​manner. The movable contact structure 100 obtained by the above design can improve the short-time withstand current performance through the first contact or the second contact connected in a clamping manner when the arc voltage increases, so as to avoid being burned, thereby improving the reliability and service life of the movable contact structure 100.

[0039] Furthermore, when the moving contact structure 100 is driven to move toward the stationary contact 210 of the contact system 200, the arc contact 130 contacts the stationary contact 210 before the main contact 120; when the moving contact structure 100 is driven to move toward the stationary contact 210 away from the contact system 200, the arc contact 130 separates from the stationary contact 210 after the main contact 120.

[0040] Specifically, the movable contact structure 100 of the present application can be driven to move toward or away from the stationary contact 210 of the contact system 200, so as to contact with the stationary contact 210 to close the switch, or to separate from the stationary contact 210 to open the switch. When the movable contact structure 100 is driven to move toward the stationary contact 210 of the contact system 200, the arc contact 130 can first contact with the stationary contact 210, and then the movable contact can contact with the stationary contact 210; when the movable contact structure 100 is driven to move toward the stationary contact 210 away from the contact system 200, the movable contact can first separate from the stationary contact 210, and then the arc contact 130 can separate from the stationary contact 210.

[0041] Through such an arrangement, during the process of closing or opening the moving contact structure 100 and the stationary contact 210, the arc contact 130 and the stationary contact 210 can first contact and then separate, so that the arc starts on the arc contact 130 and finally concentrates on the arc contact 130 and is 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 one possible implementation mode of the present application, the main contact 120 includes a plurality of segmented main contact plates 121 arranged side by side, and the arc contact 130 includes two segmented arc contact plates 131 arranged at intervals; the two segmented arc contact plates 131 are respectively subjected to the clamping force of the segmented main contact plates 121 of the adjacent main contact 120, and the directions of the two clamping forces are opposite.

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

[0044] like Figure 5 As shown, since the arc contact 130 is disposed between the two main contacts 120, the two segmented contact plates can be respectively subjected to the clamping force of the segmented main contact plate 121 of the main contact 120 on the adjacent side, and the two clamping forces on the two segmented contact plates are in opposite directions and are both directed in opposite directions. When the current increases, the two clamping forces on the two segmented contact plates gradually increase, which is more conducive to increasing the short-time withstand current performance of the moving contact structure 100.

[0045] It should be noted that when the arc contact 130 is clamped with the static contact 210, the static contact 210 generates a repulsive force when it is compressed by the mechanism spring. The direction of the repulsive force is opposite to the direction of the pressure of the arc contact 130 pressing down the static contact 210. The two-piece contact plates of the present application clamp the arc-static contact 212 of the static contact 210 in a manner of clamping electrical connection, so the repulsive force is small, thereby further increasing the short-time current withstand performance of the moving contact.

[0046] Furthermore, the length of the segmented arc contact plate 131 along the extension direction is less than the length of the segmented main contact plate 121 along the extension direction. The extension direction of the arc contact 130 plate is the plate length direction of the arc contact 130 plate, and the extension direction of the main contact plate is the plate length direction of the main contact plate. Through such a setting, the force arm of the arc contact 130 plate is smaller than that of the main contact 120 plate, so the actual force generated during the clamping connection with the arc static contact 212 of the static contact 210 is also smaller, thereby further reducing the repulsive force when electrically connected with the static contact 210, and further increasing the short-time withstand current performance of the moving contact.

[0047] In one possible implementation of the present application, the moving contact structure 100 further includes an insulating partition 140 , which is disposed between the main contact 120 and the arc contact 130 , with a preset interval between the two insulating partitions 140 , and the arc contact 130 is disposed within the preset interval.

[0048] Specifically, 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 arranged between the main contact 120 and the arc contact 130 to prevent the left and right arcing breakdown between the main contact 120 and the arc contact 130, further improving the reliability of the moving contact structure 100 and extending its service life. A preset interval is set between the two insulating partitions 140 to form a narrow gap, and the arc contact 130 is arranged in the preset interval to improve the breaking and critical current capabilities.

[0049] On the other hand of the embodiment of the present application, a contact system 200 is also provided, which includes a static contact 210 and the above-mentioned moving contact structure 100, the first contact of the moving contact structure 100 is provided with an active contact 122, and the second contact is provided with an arc moving contact 132; the static contact 210 is correspondingly provided with a main static contact 211 and an arc static contact 212, the active contact 122 can be connected to the main static contact 211, and the arc moving contact 132 can be connected to the arc static contact 212.

[0050] Specifically, the present application also provides a contact system 200, which includes a moving contact structure 100 and a stationary contact 210, and the moving contact structure 100 can contact or separate with the stationary contact 210. The moving contact structure 100 includes a first contact and a second contact, wherein an active contact 122 is provided on the first contact, and an arc moving contact 132 is provided on the second contact; correspondingly, a main stationary contact 211 and an arc stationary contact 212 are correspondingly provided on the stationary contact 210, and the positions of the main stationary contact 211 and the arc stationary contact 212 are respectively adapted to the active contact 122 and the arc moving contact 132; the main stationary contact 211 can be a plane for clapping or a protrusion for clamping, so as to be used for clapping or clamping; the arc stationary contact 212 can be a plane for clapping or a protrusion for clamping, so as to be used for clapping or clamping. The specific structure and beneficial effects of the moving contact structure 100 have been described in detail above and will not be repeated here.

[0051] The contact system 200 provided in the present application includes a static contact 210 and the above-mentioned moving contact structure 100, wherein the first contact of the moving contact structure 100 is provided with an active contact 122, and the second contact is provided with an arc moving contact 132; the static contact 210 is provided with a main static contact 211 and an arc static contact 212, respectively, the active contact 122 can be connected to the main static contact 211, and the arc moving contact 132 can be connected to the arc static contact 212. The contact system 200 obtained by the above design can also have good short-time current tolerance performance when the arc voltage increases, has good reliability, and also prolongs the service life.

[0052] Furthermore, the opening distance between the active contact 122 and the main static contact 211 is greater than the opening distance between the arc moving contact 132 and the arc static contact 212. By such a setting, it can be ensured that when the movable contact structure 100 moves toward the static contact 210, the arc moving contact 132 can firstly engage with the arc static contact 212 of the static contact 210 and then separate from the arc static contact 212 of the static contact 210 because the opening distance is smaller than that of the active contact 122.

[0053] On the other hand, an isolating switch (not shown in the figure) is provided, which includes a housing and the above-mentioned contact system 200, and the contact system 200 is arranged in 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 described in detail above and will not be repeated here. The isolating switch obtained by the above design can also have good short-term current tolerance performance when the arc voltage increases, has good reliability, and also prolongs the service life.

[0054] Furthermore, an arc extinguishing chamber is provided in the shell, and a preset number of arc extinguishing grids are provided in the arc extinguishing chamber.

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

[0056] The above description is only an optional embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A moving contact structure, characterized in that: The invention comprises a contact support (110) and a first contact and a second contact arranged side by side on the contact support (110); the first contact can be electrically connected to a stationary contact (210) of a contact system (200) by a snap-fitting manner, and the second contact can be electrically connected to a stationary contact (210) of the contact system (200) by a clamping manner; or the first contact can be electrically connected to a stationary contact (210) of the contact system (200) by a clamping manner, and the second contact can be electrically connected to a stationary contact (210) of the contact system (200) by a snap-fitting manner.

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

3. The moving contact structure according to claim 2, characterized in that: When the moving contact structure (100) is driven to move toward the stationary contact (210) of the contact system (200), the arc contact (130) contacts the stationary contact (210) before the main contact (120); when the moving contact structure (100) is driven to move toward the stationary contact (210) away from the contact system (200), the arc contact (130) separates from the stationary contact (210) after the main contact (120).

4. The moving contact structure according to claim 2, characterized in that: The main contact (120) comprises a plurality of segmented main contact plates (121) arranged side by side, and the arc contact (130) comprises two segmented arc contact plates (131) arranged at intervals; the two segmented arc contact plates (131) are respectively subjected to clamping forces of the segmented main contact plates (121) of the adjacent 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 segmented arc contact plate (131) along the extension direction is smaller than the length of the segmented main contact plate (121) along the extension direction.

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

7. A contact system, characterized in that: It comprises a static contact (210) and a moving contact structure (100) as described in any one of claims 1 to 6, wherein an active contact (122) is provided on the first contact of the moving contact structure (100), and an arc moving contact (132) is provided on the second contact; a main static contact (211) and an arc 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 arc moving contact (132) can be connected to the arc 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 arc moving contact (132) and the arc static contact (212).

9. An isolating switch, characterized in that: The invention comprises a housing and a contact system (200) according to any one of claims 7 to 8, wherein the contact system (200) is arranged in the housing.

10. The isolating switch according to claim 9, characterized in that: An arc extinguishing chamber is arranged in the shell, and a preset number of arc extinguishing grids are arranged in the arc extinguishing chamber.

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