Contact arc extinguishing system and dual-power switching equipment

Abstract

The utility model provides a contact arc extinguishing system and a dual power supply switching device. The contact arc extinguishing system comprises a static contact, a moving contact and an arc extinguishing chamber. The moving contact is arranged in a swinging manner and is close to or far away from the static contact in a swinging manner; the arc extinguish chamber comprises an arc extinguish grid plate group which is arranged on the outer side of the motion trail of the moving contact; the static contact is provided with an arc striking sheet corresponding to the arc extinguishing grid sheet group; and the tail end of the moving contact is bent towards the direction deviating from the static contact to form an arc striking end part. The electric arc can be well introduced into the arc extinguishing chamber for arc extinguishing; and the structure is simple and compact.

Description

Technical Field

[0001] The utility model relates to the field of dual power supply equipment, in particular to a contact arc extinguishing system and dual power supply switching equipment. Background Art

[0002] The dual power switching device is used to switch power sources. When the normal power suddenly fails or the power is cut off, the dual power switching device automatically switches to the backup power source so that the equipment can still operate normally. When switching, an arc will be generated when the contacts are disconnected, which will cause burns to other components, resulting in poor product stability. Therefore, in the prior art, an arc extinguishing chamber is usually added to extinguish the arc. However, the contact arc extinguishing system of the existing dual power switching device generally has a poor ability to introduce the arc into the arc extinguishing chamber, resulting in unsatisfactory results. Utility Model Content

[0003] Therefore, in order to solve the above problems, the utility model provides a contact arc extinguishing system and a dual power supply switching device.

[0004] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0005] A contact arc extinguishing system comprises a stationary contact, a moving contact and an arc extinguishing chamber; wherein the moving contact can be swung to approach or move away from the stationary contact by swinging; the arc extinguishing chamber comprises an arc extinguishing grid group, and the arc extinguishing grid group is arranged outside the movement trajectory of the moving contact; the stationary contact is equipped with an arc-striking plate corresponding to the arc extinguishing grid group, and the end of the moving contact is also bent in a direction away from the stationary contact to form an arc-striking end.

[0006] Furthermore, the surface of the arc-striking end portion of the movable contact is an arc surface.

[0007] Furthermore, the thickness of the arc-starting end portion gradually decreases along the extension direction of the end.

[0008] Furthermore, the arc extinguishing grid group comprises a plurality of arc extinguishing grids which are arranged at intervals along the moving direction of the moving contact.

[0009] Furthermore, the arc striking piece on the static contact extends to one side end of the arc extinguishing grid piece group.

[0010] Furthermore, the arc extinguishing grids of the arc extinguishing grid group are provided with asymmetric cutouts at the bottom facing the moving contact; and the cutouts of two adjacent arc extinguishing grids are staggered.

[0011] Furthermore, one side wall of the cutout of the arc-extinguishing grid has a stepped structure.

[0012] Furthermore, the arc extinguishing chamber also includes a first shell and a second shell, which cover and form an installation cavity and a clearance opening connected to the installation cavity; the arc extinguishing grid group is assembled in the installation cavity; the static contact and the moving contact extend into the installation cavity through the clearance opening.

[0013] Furthermore, the two side sections of the arc extinguishing grid are respectively provided with notches of different lengths, so that the two side sections of the arc extinguishing grid form plug-in side walls of different lengths; the first shell and the second shell are both provided with long and short staggered plug-in interfaces, the short plug-in side wall of the arc extinguishing grid is plugged into the short plug-in interface, and the long plug-in side wall of the arc grid is plugged into the long plug-in interface.

[0014] A dual power switching device comprises a driving mechanism and a contact switching mechanism; the driving mechanism drives and connects the contact switching mechanism to drive the contact switching mechanism to operate; wherein the contact switching mechanism has two sets of the above-mentioned contact arc extinguishing systems; the driving mechanism has a driving shaft, and the moving contact of the contact arc extinguishing system is fixed on the driving shaft, and the rotation of the driving shaft drives the two sets of contact arc extinguishing systems of the contact switching mechanism to alternately close.

[0015] The technical solution provided by the utility model has the following beneficial effects:

[0016] 1. The arc extinguishing grid group of the arc extinguishing chamber is arranged outside the moving track of the moving contact, which can make the structure installation more compact without hindering the movement of the moving contact.

[0017] 2. The static contact is equipped with an arc-striking plate corresponding to the arc-extinguishing grid group, and the end of the moving contact is also bent away from the static contact to form an arc-striking end; arc-striking structures are provided on both the static contact and the moving contact, so that the arc can be well introduced into the arc-extinguishing chamber for arc extinguishing; the arc-striking effect is good.

[0018] 3. The arc-striking end formed by the bending of the end of the moving contact has a good arc-striking effect without increasing the swing diameter of the moving contact, and can directly introduce the arc into the outer arc-extinguishing chamber.

[0019] The solution provided in this application has the characteristics of compact structure and good arc striking effect, making the product more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The diagram shows a partial structure of the contact arc extinguishing system in the embodiment. Figure 1 ;

[0021] Figure 2 The diagram shows a partial structure of the contact arc extinguishing system in the embodiment. Figure 2 ;

[0022] Figure 3Shown is a schematic diagram of the structure of the arc extinguishing chamber in the embodiment;

[0023] Figure 4 The figure shows a schematic diagram of the structure decomposition of the arc extinguishing chamber in the embodiment;

[0024] Figure 5 The figure is a schematic diagram of the structure of the first shell in the embodiment;

[0025] Figure 6 The figure shows a schematic diagram of the structure of a single arc-extinguishing grid in the embodiment;

[0026] Figure 7 Shown is a partial structural schematic diagram of a dual power switching device in an embodiment. DETAILED DESCRIPTION

[0027] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, 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 a limitation of the present invention.

[0029] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figures 1 to 6 As shown, a contact arc extinguishing system provided in this embodiment includes a static contact 20, a moving contact 10 and an arc extinguishing chamber 40; wherein the moving contact 10 can be swingably arranged to approach or move away from the static contact 20 by swinging; thereby realizing the closing or opening of the contact. The arc extinguishing chamber 40 includes an arc extinguishing grid group 30, and the arc extinguishing grid group 30 is arranged outside the movement trajectory a of the moving contact 10; that is, the arc extinguishing grid group 30, the moving contact 10 and the static contact 20 are located in the same plane space, which can make the structure installation more compact without hindering the movement of the moving contact 10; and the thickness of the product can be reduced. The static contact 20 is equipped with an arc-striking plate 21 corresponding to the arc extinguishing grid group 30, and the end of the moving contact 10 is also bent in a direction away from the static contact 20 to form an arc-striking end 11.

[0031] When the static contact 20 and the moving contact 10 are disconnected from the closed state, a part of the generated arc is introduced into the arc extinguishing chamber 40 by the arc-striking piece 21 on the static contact 20, and the other part is introduced into the arc extinguishing chamber 40 by the arc-striking end 11 of the moving contact 10; in this way, the arc can be effectively and quickly introduced into the arc extinguishing chamber 40, thereby well protecting the static contact 20, the moving contact 10 and other components.

[0032] The solution provided in this application has the characteristics of compact structure and good arc striking effect, making the product more stable and reliable.

[0033] The surface of the arc-striking end 11 at the end of the moving contact 10 is an arc surface, which avoids the phenomenon of tip discharge and ensures the stability of the product. The thickness of the arc-striking end 11 along the extension direction of the end gradually decreases, which can well introduce the arc into the arc extinguishing chamber 40 while saving materials. Of course, in other embodiments, the structure of the moving contact 10 is not limited to this.

[0034] Specifically, in this embodiment, the arc-extinguishing grid group 30 includes a plurality of arc-extinguishing grids 31 arranged at intervals along the moving direction of the moving contact 10 (ie, along the moving track a of the moving contact 10); Figure 2 As shown, a plurality of arc extinguishing grids 31 are arranged in an arc shape, and each arc extinguishing grid 31 and the motion trajectory a of the moving contact 10 are arranged at equal intervals, that is, no matter where the moving contact 10 swings, the arc can be well introduced into the arc extinguishing grid group 30.

[0035] Specifically, the number of arc extinguishing grids 31 of the arc extinguishing grid group 30 can be selected according to actual conditions, and the arc extinguishing grid group 30 does not need to completely cover the movement track of the moving contact 10 .

[0036] The arc-striking piece 21 on the stationary contact 20 extends to one side end of the arc-extinguishing grid group 30 , so that the generated arc can directly enter the arc-extinguishing grid group 30 from the arc-striking piece 21 and be extinguished by the multiple arc-extinguishing grids 31 of the arc-extinguishing grid group 30 .

[0037] The arc extinguishing grid 31 of the arc extinguishing grid group 30 is provided with an asymmetric cutout 311 at the bottom facing the moving contact 10; as in the present embodiment, one side wall (defined as the first side wall 312) of the cutout 311 of the arc extinguishing grid 31 is a stepped structure; the other side wall (defined as the second side wall 312) is an inclined straight wall. The cutouts 311 of two adjacent arc extinguishing grids 31 are staggered, such as the first side wall 312 of the cutout 311 of the first arc extinguishing grid 31 is arranged to the left, while the first side wall 312 of the cutout 311 of the second arc extinguishing grid 31 is arranged to the right, and the first side wall 312 of the cutout 311 of the third arc extinguishing grid 31 is arranged to the left again; such alternating arrangement can quickly lengthen and cool the arc until it is extinguished, which greatly improves the breaking capacity and electrical life of the switch.

[0038] The arc extinguishing chamber 40 also includes a first shell 41 and a second shell 42, which cover and form a mounting cavity 45 and a clearance opening connected to the mounting cavity 45. Specifically, there are two clearance openings, one is a lateral clearance opening 43, and the other is a bottom clearance opening 44, and the two clearance openings are connected; the arc extinguishing grid group 30 is assembled in the mounting cavity 45; the static contact 20 and the moving contact 10 extend into the mounting cavity 45 through the clearance openings; specifically, the static contact 20 extends into the mounting cavity 45 through the lateral clearance opening 43, and the moving contact 10 extends into the mounting cavity 45 through the bottom clearance opening 44; in this way, the arc extinguishing chamber 40, the static contact 20 and the moving contact 10 are formed to correspond to each other.

[0039] More specifically, the two side sections of the arc extinguishing grid 31 are respectively provided with notches 314 of different lengths, so that the two side sections of the arc extinguishing grid 31 form plug-in side walls of different lengths, which are respectively a short plug-in side wall 316 and a long plug-in side wall 315; the first shell 41 and the second shell 42 are both provided with long and short staggered plug-in interfaces 45, which are respectively a short plug-in interface 452 and a long plug-in interface 451, the short plug-in side wall 316 of the arc extinguishing grid 31 is plugged into the short plug-in interface 452, and the long plug-in side wall 315 of the arc grid 31 is plugged into the long plug-in interface 451; in this way, the corresponding plug-in assembly is achieved, which can well avoid assembly errors.

[0040] In this embodiment, the arc extinguishing chamber 40 uses the structure of the arc extinguishing grid group 30 alone to achieve arc extinguishing, which can meet actual needs; the number of arc extinguishing grids 31 can be increased or decreased according to actual conditions. Of course, in other embodiments, the structure of the arc extinguishing chamber 40 can also be increased on the basis of the arc extinguishing grid group 30 to help extinguish the arc, such as adding gas generating sheets, flame extinguishing sheets, etc.

[0041] Continue to refer to Figure 7 As shown, this embodiment also provides a dual power switching device, including a driving mechanism and a contact switching mechanism 60; the driving mechanism drives the contact switching mechanism 60 to drive the contact switching mechanism 60 to operate; wherein, the contact switching mechanism 60 has two groups of contact arc extinguishing systems as described above; the driving mechanism has a driving shaft 50, and the moving contact 10 of the contact arc extinguishing system is fixed on the driving shaft 50, and the rotation of the driving shaft 50 drives the two groups of contact arc extinguishing systems of the contact switching mechanism to alternately close, so as to realize the switching of the main power supply and the backup power supply.

[0042] There are multiple contact switching mechanisms 60, which are arranged side by side. The moving contacts 10 of the multiple contact switching mechanisms 60 are all assembled on the same driving shaft 50 to achieve unified switching.

[0043] Specifically, the two sets of contact arc extinguishing systems of the same contact switching mechanism 60 are arranged in opposite directions, such as Figure 7 As shown, the two sets of contact arc extinguishing systems of the contact switching mechanism 60 are one facing upward and the other facing downward, thereby increasing the creepage distance without affecting each other.

[0044] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A contact arc extinguishing system, comprising a static contact, a moving contact and an arc extinguishing chamber; characterized in that: The moving contact can be swung to approach or move away from the stationary contact by swinging; the arc extinguishing chamber includes an arc extinguishing grid group, and the arc extinguishing grid group is arranged outside the movement trajectory of the moving contact; the stationary contact is equipped with an arc-striking plate corresponding to the arc extinguishing grid group, and the end of the moving contact is also bent in a direction away from the stationary contact to form an arc-striking end.

2. The contact arc extinguishing system according to claim 1, characterized in that: The surface of the arc-striking end portion of the end of the moving contact is an arc surface.

3. The contact arc extinguishing system according to claim 1, characterized in that: The thickness of the arc striking end portion gradually decreases along the extension direction of the end.

4. The contact arc extinguishing system according to claim 1, characterized in that: The arc extinguishing grid group comprises a plurality of arc extinguishing grids which are arranged at intervals along the moving direction of the moving contact.

5. The contact arc extinguishing system according to claim 4, characterized in that: The arc-striking piece on the static contact extends to one side end of the arc-extinguishing grid piece group.

6. The contact arc extinguishing system according to claim 5, characterized in that: The arc extinguishing grids of the arc extinguishing grid group are provided with asymmetric cutouts at the bottom facing the moving contact; and the cutouts of two adjacent arc extinguishing grids are staggered.

7. The contact arc extinguishing system according to claim 6, characterized in that: A side wall of the cutout of the arc-extinguishing grid is in a stepped structure.

8. The contact arc extinguishing system according to claim 6, characterized in that: The arc extinguishing chamber also includes a first shell and a second shell, which cover and form an installation cavity and a clearance opening connected to the installation cavity; the arc extinguishing grid group is assembled in the installation cavity; the static contact and the moving contact extend into the installation cavity through the clearance opening.

9. The contact arc extinguishing system according to claim 8, characterized in that: The two side sections of the arc extinguishing grid are respectively provided with notches of different lengths, so that the two side sections of the arc extinguishing grid form plug-in side walls of different lengths; the first shell and the second shell are both provided with long and short staggered plug-in interfaces, the short plug-in side wall of the arc extinguishing grid is plugged into the short plug-in interface, and the long plug-in side wall of the arc grid is plugged into the long plug-in interface.

10. A dual power switching device, comprising a driving mechanism and a contact switching mechanism; the driving mechanism drives and connects the contact switching mechanism to drive the contact switching mechanism to operate; characterized in that: The contact switching mechanism has two groups of contact arc extinguishing systems as described in any one of claims 1 to 9; the driving mechanism has a driving shaft, and the moving contact of the contact arc extinguishing system is fixed on the driving shaft, and the rotation of the driving shaft drives the two groups of contact arc extinguishing systems of the contact switching mechanism to alternately close.

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