Contact system of electrical device

Abstract

The utility model relates to a contact system of an electrical device, which comprises a rotating shaft, a moving contact, a moving contact spring, a first rotating shaft gas-blocking accessory and a moving contact insulating gas-blocking accessory, the moving contact and the moving contact spring are both mounted on the rotating shaft, the first rotating shaft gas-blocking accessory is mounted on the rotating shaft on one side of the moving contact, and the moving contact insulating gas-blocking accessory is mounted on the rotating shaft on the other side of the moving contact. The moving contact insulating gas-blocking accessory is installed on the other side of the moving contact, one side of the moving contact insulating gas-blocking accessory wraps the outer side of the part of the moving contact extending out of the rotating shaft, and the other side of the moving contact insulating gas-blocking accessory is of an extending arc-shaped structure matched with the shape of the rotating shaft. Compared with the prior art, the air tightness between the rotating shaft and the shell is enhanced by installing the insulating accessory, the moving contact spring is convenient to install by the characteristics in the rotating shaft cavity, and the air tightness of a contact system adopting an integrated through type rotating shaft system is ensured under the condition that the synchronism of a mechanism is not sacrificed.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a contact system of an electrical device. Background Art

[0002] Conventional multi-pole molded case electrical devices currently on the market typically feature a single, insulating, integral shaft for their contact systems, extending through all poles and fitted with moving contacts and other accessories. This integrated, through-the-hole shaft results in poor airtightness in the contact system, leading to air leakage. This results in low breaking capacity and poor post-test dielectric properties. To address this shortcoming, some designs have adopted a split, independent shaft, achieving linkage between the poles through the installation of shafts and other transmission components. However, due to the shaft-hole fit, this mechanism exhibits poor synchronization, which can lead to severe wear on certain poles and reduced lifespan performance. Utility Model Content

[0003] The purpose of the present invention is to provide a contact system for an electrical device in order to overcome the above-mentioned defects in the prior art, thereby improving the air tightness of the contact system and improving the breaking capacity.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A contact system for an electrical device includes a rotating shaft, a moving contact, a moving contact spring, a first rotating shaft air-blocking accessory, and a moving contact insulating air-blocking accessory. The moving contact and the moving contact spring are both mounted on the rotating shaft. The first rotating shaft air-blocking accessory is mounted on the rotating shaft on one side of the moving contact. The moving contact insulating air-blocking accessory is mounted on the other side of the moving contact. One side of the first rotating shaft air-blocking accessory covers the outer side of the portion of the moving contact extending out of the rotating shaft, and the other side is an extended arc-shaped structure that matches the outer shape of the rotating shaft.

[0006] Furthermore, during the process from closing to opening of the contact system, the insulating air-blocking accessory of the moving contact is always in contact with the housing of the electrical device, and the first rotating shaft air-blocking accessory is always in contact with the housing of the electrical device.

[0007] Furthermore, a through cavity is provided in the rotating shaft, and two openings are generated on the curved surface of the rotating shaft; the moving contact and the moving contact spring are connected and are both installed in the cavity, and the moving contact extends from an opening of the cavity; one end of the first rotating shaft air-blocking accessory is fitted with the surface of the moving contact, and the cavity opening on the side where the moving contact extends is completely or partially closed.

[0008] Furthermore, the cavity is provided with a second rotating shaft air-blocking accessory at another opening where no moving contact extends, and is completely or partially closed by the second rotating shaft air-blocking accessory.

[0009] Furthermore, the moving contact insulating air-blocking accessory is provided with a protruding structure along the extending direction of the moving contact.

[0010] Furthermore, it also includes an outer air-blocking accessory of the rotating shaft, one side of which matches the outer shape of the rotating shaft, and the other side of which isolates the operating mechanism of the electrical device from the static contact.

[0011] Furthermore, a first boss is provided on the axial outer side of the rotating shaft, a shaft sleeve is provided on the first boss, and the contact system is in contact with the housing of the electrical device through the shaft sleeve.

[0012] Furthermore, a second boss is provided in the cavity, and a groove for positioning the moving contact spring is provided on the second boss.

[0013] Furthermore, the moving contact insulating gas-blocking accessory is made of gas-generating material.

[0014] Furthermore, the first rotating shaft air blocking accessory is made of gas-generating material.

[0015] Furthermore, it includes multiple rotating shafts extending axially.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The utility model provides a first rotating shaft air-blocking accessory and a moving contact insulating air-blocking accessory. During the entire working process of the contact system, the first rotating shaft air-blocking accessory and the shell part are always overlapped and sealed, and the insulating air-blocking accessory of the moving contact has a blocking effect, so that the disconnecting gas is always blocked in the arc extinguishing chamber, thereby enhancing the air tightness between the rotating shaft and the shell, and ensuring the air tightness of the contact system using an integrated through-type rotating shaft system without sacrificing the synchronization of the mechanism.

[0018] 2. The moving contact is equipped with wrapped insulating accessories, which take into account both insulation performance and shaft air tightness, and can reduce the escape of high-pressure gas and arc from the arc extinguishing cavity during the disconnection process of the moving contact; the raised features arranged along the direction of the moving contact hinder the flow of gas to the rear of the moving contact at the beginning of disconnection, thereby enhancing the airflow in the direction of the arc extinguishing chamber.

[0019] 3. By setting up the second shaft air-blocking accessory, the installation port on the spring side of the shaft moving contact is closed to ensure the air tightness of the system.

[0020] 4. The air tightness of the shell is enhanced by setting the air-blocking accessories outside the shaft, ensuring the insulation between the shaft and the mechanism, and between the mechanism and the conductive static contact, and preventing the mechanism from creeping and being electrified.

[0021] 5. By installing sleeves on the cylindrical bosses at both ends of the shaft and cooperating with the housing of the electrical device, the friction between the contact system and the housing of the electrical device is reduced, ensuring the matching accuracy and life during long-term use.

[0022] 6. A boss structure is provided in the cavity of the rotating shaft, and a notch is provided to match the moving contact spring, so as to facilitate the installation of the moving contact spring.

[0023] 7. If a multi-pole structure is adopted, a spacer boss is set at the connection of the rotating shaft to increase the distance and creepage path on the surface of the insulating material, which can increase the creepage distance between the two-pole live conductors and improve the insulation performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the overall structure of the contact system;

[0025] Figure 2 This is a schematic diagram of the structure of the contact system excluding the air-blocking accessories outside the rotating shaft;

[0026] Figure 3 for Figure 2 Schematic diagram of structural explosion;

[0027] Figure 4 This is an exploded diagram of the structure of the shaft air baffle attachment;

[0028] Figure 5 This is a structural diagram of the air baffle attachment of the first rotating shaft;

[0029] Figure 6 It is a structural diagram of the air baffle attachment of the second rotating shaft;

[0030] Figure 7 for Figure 4 Schematic diagram of the structure after the shaft air baffle accessory is installed;

[0031] Figure 8 for Figure 7 Schematic diagram of the structure without sleeve;

[0032] Figure 9 This is a structural diagram of the moving contact insulation air barrier accessory;

[0033] Figure 10 This is a structural diagram of the moving contact insulation air barrier accessory from another perspective;

[0034] Figure 11 This is a schematic diagram of the installation of the moving contact insulation air barrier accessory on the moving contact;

[0035] Figure 12 This is a schematic diagram of the structure of the air baffle attachment outside the rotating shaft;

[0036] Figure 13 This is a structural diagram of the air baffle attachment outside the rotating shaft from another perspective;

[0037] Figure 14 Schematic diagram of the top view of the interior of the shaft cavity;

[0038] Figure 15 This is a schematic diagram of the interior of the rotating shaft cavity before the moving contact spring is fixed;

[0039] Figure 16 This is a schematic diagram of the interior of the rotating shaft cavity after the moving contact spring is fixed;

[0040] Figure 17 This is a schematic diagram of the installation of the shaft in the housing;

[0041] Figure 18 The figure is a cross-sectional diagram of the installation of the rotating shaft in the housing;

[0042] Figure 19 It is a cross-sectional diagram of the contact system in the closed state;

[0043] Figure 20 It is a cross-sectional diagram of the contact system during breaking motion;

[0044] Figure 21 This is a cross-sectional diagram of the contact system in the open state.

[0045] Note in the figure:

[0046] 1. Rotating shaft, 2. Moving contact, 3. Moving contact spring, 4. First rotating shaft air-blocking accessory, 5. Second rotating shaft air-blocking accessory, 6. Moving contact insulation air-blocking accessory, 7. Rotating shaft outer air-blocking accessory, 8. Bushing, 9. Moving contact fixing shaft, 10. Fixing pin, 11. Static contact, 12. Tripping system, 13. Wiring terminal, 14. First boss, 15. Second boss, 16. Positioning groove, 17. Middle cover, 18. Intermediate spacer, 19. Flexible connection, 20. Raised structure, 21. Spacer boss. DETAILED DESCRIPTION

[0047] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0048] like Figure 1-3As shown, this embodiment provides a contact system for an electrical device, comprising a rotating shaft 1, a moving contact 2, a moving contact spring 3, a first rotating shaft air-blocking accessory 4, a second rotating shaft air-blocking accessory 5, and a moving contact insulating air-blocking accessory 6. The rotating shaft 1 is made of insulating material and can be expanded for use in electrical devices with more poles. In this embodiment, it is a two-pole device, and the contact system comprises two axially connected rotating shafts 1. The moving contact 2 contacts the static contact when the circuit is closed and is a current-carrying component. A through cavity is provided in the rotating shaft 1, and two openings are formed on the curved surface of the rotating shaft 1. The moving contact 2 and the moving contact spring 3 are connected and both installed in the cavity, and the moving contact 2 extends from one opening of the cavity. The first rotating shaft air-blocking accessory 4 and the second rotating shaft air-blocking accessory 5 are respectively arranged at the two openings of the cavity. When assembling the contact system, the moving contact 2 and its accessories are first assembled, and the moving contact 2 and the moving contact spring 3 are installed inside the rotating shaft 1 through the moving contact fixing shaft 9, and then the rotating shaft air-blocking accessory and the shaft sleeve 8 are installed.

[0049] In another embodiment, Figure 2 As shown, an annular spacing boss 21 is provided at the connection between the two rotating shafts 1. The provision of the spacing boss 21 can increase the distance and creepage path on the surface of the insulating material, improve the creepage distance between the two-pole charged conductors, and enhance the insulation performance of the product.

[0050] like Figure 4 and Figure 7 As shown, the first shaft air-blocking accessory 4 and the second shaft air-blocking accessory 5 of the shaft 1 are installed on the cavity opening of each pole of the shaft 1, which reduces the high-pressure gas and arc spraying into the operating mechanism during the disconnection process of the moving contact 2, and at the same time enhances the air tightness between the shaft 1 and the housing. In this embodiment, the cavity of the shaft 1 opens on the side where the moving contact 2 extends as the soft wire side mounting port of the shaft 1, and one end of the first shaft air-blocking accessory 4 fits with the surface of the moving contact 2, and partially closes the soft wire side mounting port. The first shaft air-blocking accessory 4 is made of insulating material to ensure air tightness. The other side opening of the cavity is the moving contact spring side mounting port, which is completely closed by the second shaft air-blocking accessory 5. The second shaft air-blocking accessory 5 is made of insulating material to ensure air tightness. The air-blocking accessory of the shaft 1 can be made of gas-generating material. On the premise of ensuring air tightness, it increases the air pressure in the arc extinguishing chamber during disconnection, accelerates arc transfer, and improves the disconnection speed.

[0051] In other embodiments, the cavity of the rotating shaft 1 does not need to have a circuit opening at the side where the moving contact 2 extends, and is completely closed by the first rotating shaft air-blocking accessory 4. The other side opening of the cavity is a soft wire side installation port, which is partially closed by the second rotating shaft air-blocking accessory 5, and can also achieve an airtight effect.

[0052] like Figure 5As shown, a groove is provided on the top of the first rotating shaft air-blocking accessory 4, which makes way for the soft connection 19 when the rotating shaft 1 rotates. The line from the terminal 13 is connected to the moving contact 2 in the installation port on the soft line side through the soft connection 19. In actual implementation, while meeting the space requirements of the soft connection 19, the area of ​​the first rotating shaft air-blocking accessory 4 should be as large as possible, and the groove on its top should be as small as possible to increase the air tightness as much as possible. In this embodiment, the first rotating shaft air-blocking accessory 4 is fixed by a fixing pin 10 through the shaft, and the second rotating shaft air-blocking accessory 5 is fixed by a snap-on method as an example, as shown Figure 6 As shown, other installation and fixing methods can be used in actual implementation, such as gluing, snap-fitting, riveting and other installation methods.

[0053] like Figure 8 As shown, a first boss 14 is provided on the axial outer side of the rotating shaft 1, and a shaft sleeve 8 is provided on the first boss 14. Figure 7 As shown in FIG. The contact system contacts and engages with the housing of the electrical device via a shaft sleeve 8. The provision of the shaft sleeve 8 reduces friction between the contact system and the housing of the electrical device, ensuring mating accuracy and longevity during long-term use.

[0054] The moving contact insulation air barrier accessory 6 is installed on the moving contact 2, as shown in FIG. Figure 9 and Figure 10 In this embodiment, one side of the moving contact insulation air barrier 6 covers the outer side of the moving contact 2 extending out of the rotating shaft 1, and the other side is an extended arc structure that matches the shape of the rotating shaft 1, as shown in FIG. Figure 11 As shown, the air tightness between the rotating shaft 1 and the arc extinguishing chamber is improved. The moving contact insulating gas barrier accessory 6 uses insulating materials to prevent creepage. On the one hand, the main structure of the moving contact insulating gas barrier accessory 6 is fixed on the moving contact 2, and the extended arc structure cooperates with the rotating shaft 1 to enhance the insulation performance, and can also reduce the high-pressure gas and arc from escaping the arc extinguishing cavity during the disconnection process of the moving contact 2; on the other hand, the moving contact insulating gas barrier accessory 6 is provided with a protruding structure 20 along the extension direction of the moving contact 2, which hinders the gas from flowing to the rear of the moving contact 2 at the beginning of disconnection, thereby enhancing the airflow in the direction of the arc extinguishing chamber. In this embodiment, the moving contact insulating gas barrier accessory 6 uses gas-generating materials to increase the air pressure in the arc extinguishing chamber during disconnection, accelerate the arc transfer, and increase the disconnection speed. The moving contact insulating gas barrier accessory 6 is fixed by a pin shaft as an example, and other installation and fixing methods can be used in actual implementation.

[0055] In this embodiment, the contact system further includes an air-blocking accessory 7 outside the rotating shaft, such as Figure 12 and Figure 13As shown, one side of the shaft's external air barrier 7 matches the shape of the shaft 1, covering the second shaft air barrier 5. The other side extends outward, isolating the operating mechanism of the electrical device where the contact system resides from the static contact 11. The shaft's external air barrier 7 enhances the airtightness of the contact system and isolates the operating mechanism from the static contact 11, preventing electrical creepage.

[0056] In this embodiment, a second boss 15 is provided in the cavity of the rotating shaft 1. Figure 14-16 As shown, the second boss 15 is provided with a groove for positioning the movable contact spring 3. The groove structure on both sides of the second boss 15 facilitates the positioning of the movable contact spring 3 in the free state, while the groove provides a fixed stop for the movable contact spring 3 during installation. The provision of the second boss 15 helps reduce assembly difficulty and improve assembly efficiency.

[0057] In this embodiment, Figure 17 and Figure 18 As shown, the first bosses 14 at both ends of the rotating shaft 1 are mounted with shaft sleeves 8, and the shaft sleeves 8 are aligned with the semicircular positioning grooves 16 of the middle cover 17 and the middle isolation member 18 of the electrical device respectively.

[0058] In this embodiment, the working principle of the contact system is as follows: Figure 19-21 shown.

[0059] like Figure 19 As shown, when the contact system is in the closed state and a short circuit occurs, the first shaft gas barrier 4 partially overlaps the housing on the side closest to the opening, forming a seal. This prevents the gas in the arc extinguishing chamber from migrating through the flexible wire-side mounting opening of the cavity to the shaft 1 cavity, confining the gas generated by the disconnection within the arc extinguishing cavity. The second shaft gas barrier 5 completely seals the spring-side mounting opening of the moving contact, further limiting the escape of gas from the shaft 1 cavity to the exterior of the housing.

[0060] like Figure 20 As shown, the contact system rotates when disconnected, and an arc is generated between the moving contact 2 and the static contact 11. The moving contact insulating gas barrier accessory 6 rotates along with the rotating shaft 1. The extended arc structure on one side of the moving contact insulating gas barrier accessory 6 fits tightly between the outer side of the rotating shaft and the housing of the electrical device, and its other side wraps around the gap between the moving contact 2 and the cavity of the rotating shaft 1, thereby preventing gas from entering the internal cavity and shell of the rotating shaft 1 through the gap between the moving contact 2 and the rotating shaft 1. The overlap between the first rotating shaft gas barrier accessory 4 and the housing is increased, still preventing the gas in the arc extinguishing chamber from transferring to the cavity of the rotating shaft 1.

[0061] like Figure 21As shown, when the contact system short-circuits and disconnects to the open state, the moving contact 2 moves to its maximum opening distance, and the moving contact 2 is in contact with the housing. At this time, the extended arc structure of the moving contact insulating gas barrier 6 still overlaps with the housing, so that the movement of the disconnecting gas toward the rotating shaft 1 is blocked by the moving contact insulating gas barrier 6, further ensuring airtightness.

[0062] During the process of the contact system switching from closing to opening, the moving contact insulating air-blocking accessory 6 is always in contact with the housing of the electrical device, and the first rotating shaft air-blocking accessory 4 is also always in contact with the housing of the electrical device, thereby ensuring the air tightness of the contact system during operation.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation to the present invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0065] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0066] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0067] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0068] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A contact system for an electrical device, characterized in that: The invention comprises a rotating shaft (1), a moving contact (2), a moving contact spring (3), a first rotating shaft air-blocking accessory (4) and a moving contact insulating air-blocking accessory (6), wherein the moving contact (2) and the moving contact spring (3) are both mounted on the rotating shaft (1), the first rotating shaft air-blocking accessory (4) is mounted on the rotating shaft (1) on one side of the moving contact (2), and the moving contact insulating air-blocking accessory (6) is mounted on the other side of the moving contact (2), one side of which covers the outer side of the portion of the moving contact (2) extending out of the rotating shaft (1), and the other side is an extended arc structure that matches the outer shape of the rotating shaft (1).

2. The contact system of an electrical device according to claim 1, characterized in that: During the process of the contact system switching from closing to opening, the moving contact insulating air-blocking accessory (6) is always in contact with the housing of the electrical device, and the first rotating shaft air-blocking accessory (4) is always in contact with the housing of the electrical device.

3. The contact system of an electrical device according to claim 1, characterized in that: A through cavity is provided in the rotating shaft (1), and two openings are formed on the curved surface of the rotating shaft (1); the moving contact (2) and the moving contact spring (3) are connected and both are installed in the cavity, and the moving contact (2) extends from an opening of the cavity; one end of the first rotating shaft air-blocking accessory (4) is fitted with the surface of the moving contact (2), and the cavity is completely or partially closed at the opening on the side where the moving contact (2) extends.

4. The contact system of an electrical device according to claim 3, characterized in that: The cavity is provided with a second rotating shaft air blocking accessory (5) at another opening where no moving contact (2) extends, and is completely or partially closed by the second rotating shaft air blocking accessory (5).

5. The contact system of an electrical device according to claim 1, characterized in that: The moving contact insulating air-blocking accessory (6) is provided with a protruding structure (20) along the extending direction of the moving contact (2).

6. The contact system of an electrical device according to claim 1, characterized in that: It also includes an outer air-blocking accessory (7) for the rotating shaft. One side of the outer air-blocking accessory (7) matches the outer shape of the rotating shaft (1), and the other side isolates the operating mechanism of the electrical device from the static contact (11).

7. The contact system of an electrical device according to claim 1, characterized in that: A first boss (14) is provided on the axial outer side of the rotating shaft (1), a shaft sleeve (8) is provided on the first boss (14), and the contact system contacts the housing of the electrical device through the shaft sleeve (8).

8. The contact system of an electrical device according to claim 3, characterized in that: A second boss (15) is provided in the cavity, and a groove for positioning the moving contact spring (3) is provided on the second boss (15).

9. The contact system of an electrical device according to claim 1, characterized in that: The moving contact insulating gas blocking accessory (6) is made of gas-generating material.

10. The contact system of an electrical device according to claim 1, characterized in that: The first rotating shaft air blocking accessory (4) is made of gas-generating material.

11. The contact system of an electrical device according to claim 1, characterized in that: It comprises a plurality of rotating shafts (1) extending axially.

12. A contact system for an electrical device according to claim 11, characterized in that: The connection points of the multiple rotating shafts (1) are provided with spacer bosses (21).

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