An arc extinguishing structure and a contactor having the arc extinguishing structure

Abstract

The present invention provides an arc extinguishing structure and a contactor having the arc extinguishing structure, belonging to the technical field of electrical components. The arc extinguishing structure includes: a base, wherein a plurality of contact accommodating cavities are provided in the base, and two relatively arranged contact accommodating cavities form an accommodating cavity group. Both ends of the moving contact extend into the two contact accommodating cavities of each accommodating cavity group respectively. An arc extinguishing member is detachably arranged in each contact accommodating cavity, and the arc extinguishing member is located at the contact point between the moving contact and the static contact. In the arc extinguishing structure of the present invention, an arc extinguishing member is separately arranged in each contact accommodating cavity on the base. Through the arc extinguishing member, a relatively large heat exchange area can be provided to realize the cooling inside the arc extinguishing chamber and quickly realize the transition from a metal arc to an air arc, so as to reduce the arc extinguishing of the silver contact. And the arc extinguishing member is detachably arranged on the base. When manufacturing the base and the arc extinguishing member, they can be produced separately and then assembled, which is convenient for manufacturing.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical components, and particularly to an arc extinguishing structure and a contactor having the arc extinguishing structure. Background Art

[0002] A contactor, in a broad sense, refers to an electrical appliance that uses a coil to pass a current to generate a magnetic field in industrial electricity, causing the contacts to close to control a load. The working principle of the contactor is as follows: when the contactor coil is energized, the coil current will generate a magnetic field, and the generated magnetic field causes the static iron core to generate an electromagnetic suction force to attract the moving iron core, and drives the moving contact of the contactor to act, causing the normally closed contact to open and the normally open contact to close, and the two are linked. When the coil is de-energized, the electromagnetic suction force disappears, and the armature is released under the action of the release spring, causing the contacts to return to their original state, the normally open contact to open, and the normally closed contact to close.

[0003] At present, most of the commonly used contactor products are three normally open contactors, and most of the normally closed products are 2 normally closed and 2 normally open contactors, and there are no related three normally closed energy-saving products. For a load that is energized for a long time, the three normally open contactors do not have an energy-saving effect because the coil needs to be energized for a long time, and the temperature rise is relatively high. For the 2 normally open and 2 normally closed contactors, since both the normally closed and the normally open only have 2 phases, they do not have the ability to switch on and off a three-phase motor.

[0004] In addition, at the contacts of the contactor, when the moving contact and the static contact are connected or disconnected, an arc will be generated. Since a plurality of contacts of the contactor are generally arranged in parallel, it is not convenient to install an arc extinguishing device at the contacts. After the arc occurs, it is easy to cause the arc extinguishing of the silver contacts of the contacts. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that it is not convenient to install an arc extinguishing device at the contacts of the existing contactors in the prior art, so as to provide an arc extinguishing structure and a contactor having the arc extinguishing structure.

[0006] To solve the above technical problem, the present invention provides an arc extinguishing structure, including: a base, wherein a plurality of contact accommodating cavities arranged in parallel are provided in the base, and a moving contact and a static contact are adapted to be arranged in the contact accommodating cavities;

[0007] Two of the contact accommodating cavities are oppositely arranged to form a set of accommodating cavities, and both ends of the moving contact respectively extend into the two contact accommodating cavities of each set of accommodating cavities, and at least one static contact for cooperating with the moving contact is correspondingly arranged in each of the contact accommodating cavities;

[0008] At least one arc extinguishing member is detachably arranged in each of the contact accommodating cavities, and the arc extinguishing member is located at the contact point of the moving contact and the static contact.

[0009] Optionally, in the contact receiving cavity of the base, there is a card slot for clamping the arc extinguishing member; both sides of the arc extinguishing member are respectively clamped into the card slot.

[0010] Optionally, in the contact receiving cavity of the base, there is a slot for inserting the arc extinguishing member; the top end of the arc extinguishing member is inserted into the slot.

[0011] Optionally, the top end of the arc extinguishing member has two insertion plates extending upward, and there is a gap between the two insertion plates. The two insertion plates are respectively inserted into the corresponding slots on the base.

[0012] Optionally, a reinforcing rib is connected between the two insertion plates of the arc extinguishing member.

[0013] Optionally, at least one extension plate extending transversely is provided on the arc extinguishing member, and the extending end of the extension plate is a free end.

[0014] Optionally, at least one extension plate is respectively provided on the two insertion plates of the arc extinguishing member; the extension plate extends transversely, and the extending end of the extension plate is a free end.

[0015] Optionally, on the base, at the position corresponding to the extension plate of the arc extinguishing member, there is an operation port; a groove for restricting the up and down displacement of the extension plate is provided on the operation port.

[0016] Optionally, the static contact is connected to the base by insertion, and there is an upward bend on the section of the static contact close to the contact point. The bend and the side of the arc extinguishing member jointly form an arc extinguishing chamber.

[0017] The present invention also provides a contactor, including: the arc extinguishing structure according to any one of the above solutions, and further including: an insert core slidably inserted into the base, a moving contact is elastically arranged on the insert core through an elastic member, both ends of the moving contact respectively extend into the contact receiving cavity of the base, a static contact is arranged in the contact receiving cavity, and the static contact and the moving contact are in a normally closed state under the action of the elastic member.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. For the arc extinguishing structure provided by the present invention, an arc extinguishing member is separately arranged in each contact receiving cavity of the base. Through this arc extinguishing member, a relatively large heat exchange area can be provided to realize the cooling inside the arc extinguishing chamber and quickly realize the transition from a metal arc to an air arc, so as to reduce the arc extinguishing of the silver contact; and the arc extinguishing member is detachably arranged on the base. When manufacturing the base and the arc extinguishing member, they can be produced separately and then assembled, which is convenient for manufacturing.

[0020] 2. The arc extinguishing structure provided by the present invention enables the arc extinguishing component to be detachably connected to the base through the cooperation of snap connection and plug connection, so that the arc extinguishing component is fixed in the base, avoiding the position change of the arc extinguishing component during transportation or daily use.

[0021] 3. For the arc extinguishing structure provided by the present invention, the function of the reinforcing rib connected to the insertion plate is to prevent the insertion plate on the arc extinguishing component from deforming due to drastic temperature change during arc extinguishing, which may cause the deformation of the arc extinguishing component, resulting in the deformation of the arc extinguishing chamber and the reduction of the arc extinguishing space, thus being unfavorable for product use.

[0022] 4. For the arc extinguishing structure provided by the present invention, an extension plate extending horizontally is provided on the arc extinguishing component. After the arc extinguishing component is installed on the base, by operating the extension plate, the extension plate is bent into the groove of the operation port of the base, and the up and down direction of the arc extinguishing component can be positioned through the extension plate. Then, in cooperation with the card slot and the plug slot of the base, the arc extinguishing component can be stably installed on the base.

[0023] 5. The contactor provided by the present invention has the advantages described in any one of the above solutions due to having the arc extinguishing structure of any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a perspective view provided in an embodiment of the contactor of the embodiment of the present invention.

[0026] Figure 2 It is Figure 1 an exploded view of a part of the internal structure of the contactor in

[0027] Figure 3 It is Figure 1 a schematic diagram of hiding a static contact on the basis of

[0028] Figure 4 It is Figure 1 a schematic diagram of a part of the internal structure after cutting the contactor in

[0029] Figure 5 It is Figure 4 an exploded view of area A in

[0030] Figure 6 a schematic diagram of the cooperation between the arc extinguishing component and the static contact.

[0031] Figure 7 is Figure 6 the exploded view of

[0032] Figure 8 is the arc extinguishing schematic diagram of the arc extinguishing structure.

[0033] Description of the reference numerals in the drawings:

[0034] 1. Base; 2. Stationary contact; 3. Moving contact; 4. Elastic member; 5. Insert core; 6. Arc extinguishing member; 7. Contact accommodating cavity; 8. Card slot; 9. Slot; 10. Insertion plate; 11. Reinforcing rib; 12. Extension plate; 13. Operation opening; 14. Groove; 15. Bend; 16. Insertion groove. Specific embodiments

[0035] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] This embodiment provides a specific implementation manner of a contactor, such as Figure 1 , Figure 2As shown in the figure, it includes: a base 1, in which a static contact 2 and a moving contact 3 are provided; specifically, the static contact 2 is connected to the base 1 by insertion, the moving contact 3 is movably connected to an insert core 5 through an elastic member 4, the insert core 5 is slidably inserted into the base 1, and the insert core 5 slides in the base 1 driven by a coil magnetic field to perform opening and closing operations. In addition, the static contact 2 and the moving contact 3 are normally closed under the action of the elastic member 4: when the coil is not powered on, the insert core 5 is pushed up by a spring, the moving contact 3 and the static contact 2 are in close contact to generate a path, and under the action of the elastic member 4, the moving contact 3 has an overtravel amount, so as to generate a contact pressure to facilitate current connection. At this time, the contactor coil is in a non-powered state, so that an energy-saving effect can be achieved. In terms of thermal balance, at this time, the coil does not generate heat, only the main circuit generates heat. As long as its contact resistance is within a reasonable range, the temperature rise can be significantly reduced, so that the cross-sectional areas of the moving contact plate and the static contact plate can be reduced, and the copper consumption can be reduced.

[0040] As Figure 2 shown, an arc extinguishing structure is also provided in the base 1, and through the arc extinguishing structure, the arc generated between the static contact 2 and the moving contact 3 is extinguished. The arc extinguishing structure includes: an arc extinguishing member 6, a static contact 2 cooperating with the arc extinguishing member 6, and a contact accommodating cavity 7 on the base 1. A plurality of contact accommodating cavities 7 arranged in parallel are provided in the base 1, and a moving contact 3 and a static contact 2 are arranged in the contact accommodating cavity 7; two of the contact accommodating cavities 7 are arranged opposite to each other to form a set of accommodating cavities, and both ends of the moving contact 3 extend into the two contact accommodating cavities 7 of each set of accommodating cavities respectively, and a static contact 2 for cooperating with the moving contact 3 is correspondingly arranged in each of the contact accommodating cavities 7; an independent arc extinguishing member 6 is detachably arranged in each of the contact accommodating cavities 7, and the arc extinguishing member 6 is located at the contact point between the moving contact 3 and the static contact 2, and the arc extinguishing member 6 is used to extinguish the arc generated between the moving contact 3 and the static contact 2. As a preferred embodiment, one of the arc extinguishing members 6 adopts an integral structure. In addition, one of the arc extinguishing members 6 can also adopt a structure of multiple sub-assemblies.

[0041] As Figure 3 shown, the static contact 2 is connected to the base 1 by insertion, and there is an interference fit between the contact plate of the static contact 2 and the insertion groove 16 of the base 1, so as to ensure the stable connection of the static contact 2 on the base 1.

[0042] As Figure 4 and Figure 5As shown, within the contact accommodating cavity 7 of the base 1, there is a card slot 8 for clamping the arc extinguishing member 6, and both side edges of the arc extinguishing member 6 are respectively inserted into the card slot 8. Within the contact accommodating cavity 7 of the base 1, there is also a slot 9 for inserting the arc extinguishing member 6, and the top end of the arc extinguishing member 6 is inserted into the slot 9. There is an interference fit between the arc extinguishing member 6 and the base 1, thereby ensuring the stable connection of the arc extinguishing member 6 on the base 1. Additionally, as an alternative implementation, multiple static contacts 2 can be arranged at intervals up and down within the contact accommodating cavity 7 of the base 1 to achieve the on-off of multiple circuits.

[0043] As Figure 6 、 Figure 7 shown, at the top end of the arc extinguishing member 6, there are two insertion plates 10 extending upward, and there is a gap between the two insertion plates 10. The two insertion plates 10 are respectively inserted into the corresponding slots 9 on the base 1. A reinforcing rib 11 is connected between the two insertion plates 10 of the arc extinguishing member 6, which is used to prevent the insertion plates 10 on the arc extinguishing member 6 from deforming due to a drastic change in temperature during arc extinguishing, and the deformation of the arc extinguishing member 6 causing the deformation of the arc extinguishing chamber and the reduction of the arc extinguishing space, which is not conducive to the use of the product. On the two insertion plates 10 of the arc extinguishing member 6, there is respectively an extension plate 12. The two extension plates 12 extend in the transverse direction towards the opposite direction, and the extending end of the extension plate 12 is a free end. During assembly, the arc extinguishing member 6 is fixed on the base 1 by bending the extension plate 12.

[0044] As Figure 1 shown, on the base 1, at the position corresponding to the extension plate 12 of the arc extinguishing member 6, there is an operation opening 13, and there is a groove 14 on the operation opening 13 for restricting the up and down displacement of the extension plate 12. After installing the arc extinguishing member 6 onto the base 1, by operating the extension plate, the extension plate is bent into the groove 14 of the operation opening 13 of the base 1, and the up and down direction of the arc extinguishing member 6 can be positioned through the extension plate. Then, in cooperation with the card slot 8 and the slot 9 of the base 1, the arc extinguishing member 6 can be stably installed onto the base 1.

[0045] Additionally, as an alternative implementation, one or more extension plates can be arranged to extend in the transverse direction, and the arc extinguishing member 6 can be better locked onto the base 1 through the extension plates.

[0046] As Figure 7 shown, on the section of the static contact 2 close to the contact point, there is an upward bend 15, and the bend 15 and the side edge of the arc extinguishing member 6 jointly form an arc extinguishing chamber to improve the arc extinguishing effect.

[0047] Working Principle

[0048] As Figure 8As shown, the cross plate of the arc extinguishing part 6 is located in the arc generation area between the moving contact 3 and the static contact 2. When the arc causes gas expansion due to the high temperature generated by itself and generates an outward blowing force, the arc will quickly contact the arc extinguishing part 6 after being generated (its movement direction is as shown by the arrow in 8). When in contact, since the arc extinguishing part 6 is made of iron and has a relatively large specific heat capacity, the arc will be deionized and cooled on it. When the current passes through zero, the arc will go out. The cover plate and side plate of the arc extinguishing part 6 are both in the arc extinguishing space. The high-temperature gas generated by the arc and the metal vapor generated during the initial stage of the metal arc can both achieve cooling of the inside of the arc extinguishing chamber and quickly realize the transition from the metal arc to the air arc through the relatively large heat exchange area provided by the arc extinguishing part 6, reducing the consumption of silver contacts. And it can prevent the arc from causing re-breakdown after moving out of the contact area and prevent the arc from reigniting due to high temperature after the current passes through zero.

[0049] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An arc extinguishing structure, It is characterized in that include: A base (1), wherein the base (1) has a plurality of contact accommodating cavities (7) arranged in parallel, wherein the contact accommodating cavities (7) are suitable for arranging moving contacts (3) and stationary contacts (2); The two contact accommodating cavities (7) are arranged opposite to each other to form an accommodating cavity group, the two ends of the moving contact (3) respectively extend into the two contact accommodating cavities (7) of each accommodating cavity group, and at least one stationary contact (2) for cooperating with the moving contact (3) is correspondingly arranged in each of the contact accommodating cavities (7); At least one arc extinguishing member (6) is detachably arranged in each of the contact accommodating chambers (7), and the arc extinguishing member (6) is located at a contact point between the moving contact (3) and the stationary contact (2); The contact accommodating cavity (7) has a slot (9) for inserting the arc extinguishing member (6), and the top end of the arc extinguishing member (6) is inserted into the slot (9); the arc extinguishing member (6) has at least one extension plate (12) extending in the transverse direction, and the extension end of the extension plate (12) is a free end; the base (1) has an operating port (13) at a position corresponding to the extension plate (12), and the operating port (13) has a groove (14) for limiting the upward and downward displacement of the extension plate (12).

2. The arc extinguishing structure according to claim 1, It is characterized in that The contact accommodating cavity (7) of the base (1) is provided with a clamping groove (8) for clamping the arc extinguishing member (6); two side edges of the arc extinguishing member (6) are respectively clamped into the clamping groove (8).

3. The arc extinguishing structure according to claim 1, It is characterized in that The top end of the arc extinguishing member (6) has two inserting plates (10) extending upwards, with a gap between the two inserting plates (10), and the two inserting plates (10) are respectively inserted into corresponding slots (9) on the base (1).

4. The arc extinguishing structure according to claim 3, It is characterized in that A reinforcing rib (11) is connected between the two plug plates (10) of the arc extinguishing member (6).

5. The arc extinguishing structure according to claim 3, It is characterized in that At least one extension plate (12) is respectively provided on the two plug plates (10) on the arc extinguishing member (6); the extension plates (12) extend in a transverse direction, and the extension ends of the extension plates (12) are free ends.

6. The arc extinguishing structure according to any one of claims 3 to 5, It is characterized in that The stationary contact (2) is connected to the base (1) by plugging, and a section of the stationary contact (2) close to the contact point has an upward bend (15), and the bend (15) forms an arc extinguishing chamber together with a side of the arc extinguishing piece (6).

7. A contactor, It is characterized in that include: The arc extinguishing structure according to any one of claims 1 to 6 further comprises: an insert (5) slidably inserted in the base (1), a moving contact (3) being elastically provided on the insert (5) through an elastic member (4), two ends of the moving contact (3) respectively extending into a contact accommodating cavity (7) of the base (1), a stationary contact (2) being provided in the contact accommodating cavity (7), and the stationary contact (2) and the moving contact (3) being in a normally closed state under the action of the elastic member (4).

Images