Contact structure of dual-power change-over switch

Abstract

The utility model provides a contact structure of a dual-power change-over switch, which comprises a contact support movably mounted on a shell and provided with at least one moving contact; the static contact is fixed on the shell and is arranged corresponding to the moving contact; and the arc blocking sheet comprises a fixed part attached to the static contact and an arc blocking part perpendicular to the fixed part, and the fixed part is fixed with the static contact through a fastener. In this way, electric arcs and metal particles generated during breaking can be jetted to the arc blocking piece, electric arc energy can be consumed, the metal particles can be attached to the arc blocking piece, and therefore damage to the shell and a wire is reduced, further, the arc blocking piece is made of gas generating materials, the arc blocking piece can consume oxygen in the shell due to high-temperature ablation, and the arc blocking piece is made of gas generating materials. West gas and anaerobic ions can be generated, so that the arcing time is shortened, and the electrical wear of the contact is reduced. In addition, the arc blocking sheet is directly installed on the static contact, so that the installation is faster and more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a contact structure of a dual power conversion switch. Background Art

[0002] Dual power transfer switches are mainly used in emergency power supply systems. When the normal power suddenly fails or there is a power outage, the dual power transfer switch will automatically switch to the backup power supply to ensure that the equipment can still operate normally.

[0003] When the switch contacts of the existing dual power conversion switch are subjected to large current (such as 3900A) connection and disconnection tests, the generated arc energy is large, which will not only burn the contacts and cause electrical wear of the contacts, shortening the service life of the product, but also easily damage the plastic shell or the wires. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the prior art that the contacts are easily electrically worn under large currents, causing damage to the plastic shell or the wires, thereby providing a contact structure of a dual power conversion switch with a long service life.

[0005] To this end, the utility model provides a contact structure of a dual power conversion switch, including a contact support, a static contact and an arc blocking piece, wherein the contact support is movably mounted on a shell, and at least one moving contact is mounted on the contact support; the static contact is fixed on the shell and arranged corresponding to the moving contact; the arc blocking piece includes a fixing portion that is fitted with the static contact, and an arc blocking portion that is perpendicular to the fixing portion, and the fixing portion is fixed to the static contact by a fastener.

[0006] Both sides of the bottom of the arc blocking portion are provided with limit blocks extending downwards, and the limit blocks are used to abut against the side surfaces of the static contact.

[0007] The stationary contact is formed with a threaded hole, and the fastener is a screw connected to the threaded hole.

[0008] The static contact includes a wiring portion, a mounting portion, a connecting portion and a contact knife portion which are sequentially connected from the outside to the inside of the shell. The mounting portion is fixed to the shell by screws, and the fixing portion of the arc-blocking plate is installed on the connecting portion or the mounting portion.

[0009] The connecting portion has at least one arc isolation groove disposed adjacent to the knife contact portion.

[0010] The contact support is slidably installed in the middle part of the shell, and there are two groups of static contacts. The two groups of static contacts are arranged on both sides of the contact support transfer direction. The middle part of the moving contact is fixed on the contact support, and its two ends extend out of the contact support respectively. A limiting groove is formed in the middle part of the moving contact, and a limiting rib matching the limiting groove is formed on the contact support.

[0011] The arc blocking piece is made of a gas generating material.

[0012] There are two arc blocking pieces, which are respectively installed on the front and back sides of the static contact.

[0013] The technical solution of the utility model has the following advantages:

[0014] 1. The contact structure of the dual power conversion switch provided by the utility model includes a contact support, a moving contact, a stationary contact and an arc-blocking plate. The arc-blocking plate includes a fixing portion that is fitted with the stationary contact and an arc-blocking portion that is perpendicular to the fixing portion. The fixing portion is fixed to the stationary contact by a fastener. In this way, the arc and metal particles generated during disconnection will be sprayed onto the arc-blocking plate, the arc energy will be consumed, and the metal particles will adhere to the arc-blocking plate, thereby reducing damage to the housing and the wire; in addition, the arc-blocking plate is directly installed on the stationary contact, which is quick and convenient to install.

[0015] 2. The contact structure of the dual power conversion switch provided by the utility model has downwardly extending limit blocks on both sides of the bottom of the arc blocking part, and the limit blocks are used to abut against the side surfaces of the static contact, thereby preventing the arc blocking part from deflecting relative to the static contact due to vibration during the opening and closing process, thereby ensuring the arc blocking effect.

[0016] 3. The contact structure of the dual power conversion switch provided by the utility model has a static contact formed with a threaded hole, the fastener is a screw connected to the threaded hole, and the arc-blocking plate is fixed to the static contact by the screw, which has the advantage of quick and convenient installation.

[0017] 4. The contact structure of the dual power conversion switch provided by the utility model has a connecting portion with at least one arc isolation groove arranged adjacent to the contact blade portion, which is similar to the method of dividing a large arc into multiple small arcs by a plurality of arc extinguishing grids arranged at intervals. One or more arc isolation grooves can play a certain role in dividing the arc, thereby helping to reduce the arc burning time.

[0018] 5. The contact structure of the dual power conversion switch provided by the utility model is that the arc blocking piece is made of a gas-generating material, so that the arc blocking piece will consume the oxygen in the shell due to high-temperature ablation, and will produce western gas and anaerobic ions, thereby reducing the arcing time and further reducing the electrical wear of the contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a three-dimensional diagram of the dual power conversion switch of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0022] Figure 3 It is a schematic diagram of the explosion structure of the static contact and the arc-blocking plate;

[0023] Figure 4 It is a structural schematic diagram of the static contact;

[0024] Figure 5 It is a three-dimensional diagram of the moving contact;

[0025] Figure 6 Partial perspective view of the contact support.

[0026] Explanation of the accompanying drawings: 1. Contact support; 2. Housing; 3. Moving contact; 4. Static contact; 5. Arc blocking plate; 6. Fixing part; 7. Arc blocking part; 8. Fastener; 9. Threaded hole; 10. Wiring part; 11. Mounting part; 12. Connecting part; 13. Knife contact part; 14. Arc isolation groove; 15. Limiting groove; 16. Limiting rib; 17. Limiting block. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example

[0032] This embodiment provides a contact structure of a dual power conversion switch, such as Figure 1 and Figure 2 As shown, it includes a contact support 1, a moving contact 3, a stationary contact 4 and an arc blocking piece 5.

[0033] The contact support 1 is slidably mounted in the middle of the housing 2. The middle of the moving contact 3 is fixed on the contact support 1, and both ends thereof extend out of the contact support 1. Figure 5 and Figure 6 As shown, a limiting groove 15 is formed in the middle of the moving contact 3 , and a limiting rib 16 matching with the limiting groove 15 is formed on the contact support 1 .

[0034] The stationary contacts 4 are fixed on the housing 2. In this embodiment, there are two groups of stationary contacts 4, which are arranged on both sides of the contact support 1 in the transfer direction. Figure 3 and Figure 4As shown, the static contact 4 includes a wiring portion 10, a mounting portion 11, a connecting portion 12 and a contact knife portion 13 which are sequentially connected from the outside to the inside of the shell 2. The mounting portion 11 is fixed to the shell 2 by screws, and the connecting portion 12 has at least one arc isolation groove 14 arranged adjacent to the contact knife portion 13. It should be noted that, similar to the method of dividing a large arc into multiple small arcs by a plurality of arc extinguishing grids arranged at intervals, one or more arc isolation grooves can play a role in dividing the arc to a certain extent, thereby facilitating the extinguishing of the arc and reducing the arc burning time.

[0035] Arc stopper 5, such as Figure 3 As shown, it includes a fixing portion 6 that is fitted with the static contact 4, and an arc-blocking portion 7 that is vertically arranged with the fixing portion 6. The bottom sides of the arc-blocking portion 7 are provided with limit blocks 17 extending downward, and the limit blocks 17 are used to abut against the side surfaces of the static contact 4. The fixing portion 6 is fixed to the static contact 4 by a fastener 8. The static contact 4 is formed with a threaded hole 9, and the fastener 8 is a screw connected to the threaded hole 9. In this embodiment, there are two arc-blocking plates 5, and the fixing portions 6 of the two arc-blocking plates 5 are installed on the front and back sides of the connecting portion 12. The arc-blocking plate 5 is made of gas-generating material. In this embodiment, the material of the arc-blocking plate is nylon. It should be noted that after the arc-blocking plate 5 and the arc-isolating groove 14 are arranged, it can withstand 6 connection and disconnection tests of a large current of 3900A, which meets the requirements of the State Grid for 5 large current connection and disconnection tests.

[0036] As a convertible implementation, the fixing portion 6 of the arc-blocking plate 5 is mounted on the mounting portion 11 , and the fixing portion 6 , the mounting portion 11 and the housing 2 may be fixed together by the same screw.

[0037] The contact structure of the dual power conversion switch provided by the utility model comprises a contact support 1, a moving contact 3, a stationary contact 4 and an arc-blocking piece 5, wherein the arc-blocking piece 5 comprises a fixing portion 6 arranged in close contact with the stationary contact 4 and an arc-blocking portion 7 arranged perpendicular to the fixing portion 6, and the fixing portion 6 is fixed to the stationary contact 4 by a fastener 8. In this way, the arc and metal particles generated during disconnection will be sprayed onto the arc-blocking piece 5, the arc energy will be consumed, and the metal particles will adhere to the arc-blocking piece 5, thereby reducing the damage to the housing 2 and the wire; in addition, the arc-blocking piece 5 is directly installed on the stationary contact, and the installation is quick and convenient.

[0038] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A contact structure of a dual power conversion switch, characterized in that: include: A contact support (1) is movably mounted on the housing (2), and at least one moving contact (3) is mounted on the contact support (1); A stationary contact (4) is fixed on the housing (2) and is arranged corresponding to the moving contact (3); The arc-blocking piece (5) comprises a fixing portion (6) arranged in close contact with the stationary contact (4), and an arc-blocking portion (7) arranged perpendicular to the fixing portion (6); the fixing portion (6) is fixed to the stationary contact (4) via a fastener (8).

2. The contact structure of the dual power conversion switch according to claim 1, characterized in that: Both sides of the bottom of the arc blocking portion (7) are provided with limit blocks (17) extending downwards, and the limit blocks (17) are used to abut against the side surfaces of the static contact (4).

3. The contact structure of the dual power conversion switch according to claim 1 or 2, characterized in that: The stationary contact (4) is formed with a threaded hole (9), and the fastener (8) is a screw connected to the threaded hole (9).

4. The contact structure of the dual power conversion switch according to claim 1, characterized in that: The stationary contact (4) comprises a wiring portion (10), a mounting portion (11), a connecting portion (12) and a contact blade portion (13) which are sequentially connected from the outside to the inside of the housing (2); the mounting portion (11) is fixed to the housing (2) by means of screws, and the fixing portion (6) of the arc-blocking plate (5) is mounted on the connecting portion (12) or the mounting portion (11).

5. The contact structure of the dual power conversion switch according to claim 4, characterized in that: The connecting portion (12) has at least one arc isolation groove (14) arranged adjacent to the knife contact portion (13).

6. The contact structure of the dual power conversion switch according to claim 1, characterized in that: The contact support (1) is slidably mounted in the middle of the housing (2); the static contacts (4) are in two groups, and the two groups of static contacts (4) are arranged on both sides of the contact support (1) in a moving direction; the middle of the moving contact (3) is fixed on the contact support (1), and its two ends extend out of the contact support (1) respectively; a limiting groove (15) is formed in the middle of the moving contact (3), and a limiting rib (16) is formed on the contact support (1) to cooperate with the limiting groove (15).

7. The contact structure of the dual power conversion switch according to claim 1, characterized in that: The arc blocking plate (5) is made of a gas-generating material.

8. The contact structure of the dual power conversion switch according to claim 1, characterized in that: There are two arc blocking pieces (5), and the two arc blocking pieces (5) are respectively installed on the front side and the back side of the static contact (4).

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