CN220526777U - Arc isolation structure, contact unit and relay - Google Patents

Abstract

The utility model provides an arc isolation structure, a contact unit and a relay, and relates to the technical field of electric power. The arc isolation structure comprises a first arc isolation piece, wherein the first arc isolation piece is arranged on a movable reed, the movable reed is used for contacting or separating with a pair of stationary contact leading-out ends, and the first arc isolation piece is used for preventing arc transfer. Because the separation between the stationary contact leading-out end and the movable reed easily generates electric arc, the first arc-isolating piece is arranged outside the movable reed and is closer to the arc starting point, thereby better preventing the transfer of electric arc.

Description

Arc isolation structure, contact unit and relay

Technical Field

The present utility model relates generally to the field of power technology, and more particularly to an arc isolation structure, a contact unit, and a relay.

Background

A relay is an electronic control device applied to an automatic control circuit, and the relay is provided with a control system (also called an input loop) and a controlled system (also called an output loop), and is actually an 'automatic switch' for controlling larger current by smaller current. Therefore, the circuit plays roles of automatic adjustment, safety protection, circuit switching and the like. The existing high-voltage direct-current relay adopts a movable reed direct-acting structure as one of the relays, namely, the two fixed contacts are matched with one movable reed to realize the functions of switching on and switching off loads.

The principle of breaking load of the high-voltage direct current relay is that a permanent magnet is arranged to generate a directional magnetic blowing magnetic field, when the moving contact and the fixed contact are separated to generate an electric arc, the electric arc is rapidly elongated under the action of the magnetic blowing magnetic field until the electric arc is broken, and the breaking of the load is realized. The most severe breaking is called limit breaking, the load of limit breaking is several times of rated load, if the electric arc is not stable enough at the moving contact and the moving contact, the electric arc is transferred on the surface of the moving contact, the electric arc can not be extinguished mainly along a magnetic arc-pulling path, and finally the electric arc can not be broken, and the product can be burnt out by explosion due to overload overheat.

In addition, in order to meet the short-circuit resistance requirement, the existing high-voltage direct-current relay is generally provided with a soft magnet, namely a short-circuit resistance ring, near the internal dynamic and static contacts so as to generate electromagnetic attraction force for resisting electric repulsive force when short-circuit current passes. However, the soft magnetic body is magnetized in the vicinity of the current-carrying conductor, and thus has an attractive effect on the arc.

Because of the arrangement of the soft magnet, namely the anti-short circuit ring, when the relay is in limit breaking, the electric arc is not only influenced by the magnetic blowing field, but also influenced by the magnetized soft magnet, so that the electric arc is disordered, and the limit breaking capacity of the high-voltage direct current relay is reduced. Meanwhile, the short circuit ring is burnt out, the short circuit resistance effect is affected, and if an auxiliary contact is arranged above the short circuit ring, the auxiliary contact is burnt out by an electric arc.

Disclosure of Invention

The arc isolation structure, the contact unit and the relay provided by the utility model have the advantages that the reliability of arc breaking is improved, and the safety is good.

According to a first aspect of the present utility model, there is provided an arc isolation structure comprising:

the first arc-isolating piece is arranged on the movable reed, and the movable reed is used for contacting with or separating from a pair of stationary contact leading-out ends.

In some embodiments, the first arc-isolating member is sleeved outside the stationary contact leading-out end.

In some embodiments, a first step is arranged between the first arc separation piece and the movable reed and used for preventing arc transfer; and/or a first gap is arranged between the first arc separation piece and the movable reed and used for preventing arc transfer.

In some embodiments, the contact portion between the movable contact spring and the pair of stationary contact terminals is a first contact portion, and the first step and/or the first gap is disposed between inner edges of the first contact portion.

In some embodiments, the first arc-isolating member includes a pillar, and the top of the pillar facing the end of the fixed contact outgoing end protrudes from the top surface of the movable contact outgoing end facing the fixed contact outgoing end, so that the first step is formed between the top of the pillar and the top surface of the movable contact outgoing end.

In some of these embodiments, the first gap is disposed along an axial direction of the post.

In some embodiments, an end of the first gap facing the stationary contact leading-out end is provided with an open end, and an end of the first gap facing away from the stationary contact leading-out end is a closed end.

In some embodiments, the side wall of the movable spring is provided with a mounting groove, the upright is at least partially arranged in the mounting groove, and the first gap is arranged between the upright and the mounting groove.

In some embodiments, the mounting groove includes a first mounting portion, the first mounting portion is disposed on a side of the movable contact spring facing the stationary contact leading-out end, the upright is disposed through the first mounting portion, and the first gap is disposed between the upright and the first mounting portion.

In some embodiments, the mounting groove further comprises a fixing portion, the fixing portion is communicated with the first mounting portion, and the upright post is clamped to the fixing portion for fixing the first arc isolation piece.

In some embodiments, the mounting groove further comprises a second mounting portion, the second mounting portion is disposed on one side, away from the stationary contact leading-out end, of the movable contact, the second mounting portion is communicated with the first mounting portion through the fixing portion, the upright post penetrates through the second mounting portion, a first guide gap is disposed between the outer wall of the upright post and the inner wall of the second mounting portion, and the first guide gap is used for guiding the upright post.

In some embodiments, the first arc isolation member further includes a limiting portion, where the limiting portion is disposed on a side of the upright, away from the movable reed, and can abut against the movable reed, for limiting the upright.

In some embodiments, the first arc-isolating piece further comprises an arc-isolating ring, and the arc-isolating ring is wrapped at the end part of the movable reed along the length direction of the movable reed and at least part of the side wall of the movable reed.

In some embodiments, the first arc isolation member further includes a connecting portion, the connecting portion is disposed at a bottom of the movable reed far away from one end of the fixed contact leading-out end and is respectively connected to two ends of the arc isolation ring, and the upright post is disposed at the connecting portion.

According to a second aspect of the present utility model, a contact unit according to an embodiment of the present utility model includes a movable contact spring, a pair of stationary contact terminals, and the arc-isolating structure described above, where the movable contact spring is used for contacting with or separating from the pair of stationary contact terminals, the arc-isolating structure is disposed outside the movable contact spring, and the arc-isolating structure is used for blocking arc transfer.

In some embodiments, the side of the movable reed facing the stationary contact leading end is a top surface of the movable reed, and the top surface of the movable reed is provided with an arc-isolating part for preventing the arc from moving in a direction in which the pair of stationary contact leading ends approach each other.

In some embodiments, the arc separation portion is a first arc separation groove; and/or the number of the groups of groups,

the arc isolation part is an arc isolation rib.

In some embodiments, the contact part between the movable reed and the pair of stationary contact leading ends is a first contact part, and the arc separation part is arranged between the inner edges of the first contact part.

In some embodiments, the anti-short circuit assembly is at least arranged on one side of the movable reed facing the fixed contact leading-out end, and generates suction force when the movable reed breaks down and generates high current so as to resist electric repulsive force between the movable reed and the fixed contact leading-out end.

According to a third aspect of the present utility model, a relay according to an embodiment of the present utility model includes the above-described contact unit.

One embodiment of the present utility model has the following advantages or benefits:

according to the arc isolation structure provided by the embodiment of the utility model, because the arc is easy to generate due to separation between the leading-out end of the fixed contact and the movable reed, the first arc isolation piece is arranged on the movable reed and is closer to the arc starting point, so that the transfer of the arc is better hindered.

According to the contact unit and the relay provided by the embodiment of the utility model, the arc isolation structure is arranged outside the movable reed, and can prevent arc transfer, so that the risk of arc ablation on the movable reed is reduced, and protection on the movable reed is realized.

Drawings

For a better understanding of the utility model, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present utility model. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. The above and other features and advantages of the present utility model will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Wherein:

fig. 1 shows a schematic structural diagram of a relay according to a first embodiment of the present utility model;

FIG. 2 shows a cross-sectional view of FIG. 1 at A-A;

fig. 3 shows an exploded view of a relay according to a first embodiment of the present utility model;

fig. 4 is a schematic diagram showing the cooperation of a movable reed and a first arc-isolating member in a relay according to a first embodiment of the present utility model;

fig. 5 shows a second schematic diagram of the cooperation of the movable reed and the first arc-isolating member in the relay according to the first embodiment of the present utility model;

FIG. 6 shows a cross-sectional view of FIG. 5 at B1-B1;

FIG. 7 shows a partial enlarged view of FIG. 5 at B2;

fig. 8 shows a third schematic diagram of the cooperation of the movable reed and the first arc-isolating member in the relay according to the first embodiment of the present utility model;

FIG. 9 shows a cross-sectional view of FIG. 8 at B3-B3;

FIG. 10 shows a partial enlarged view of FIG. 8 at B4;

fig. 11 shows a second explosion diagram of the relay according to the first embodiment of the present utility model;

fig. 12 is a schematic diagram showing a structure of a movable reed in a relay according to a first embodiment of the present utility model;

fig. 13 shows a second schematic structural diagram of a movable reed in a relay according to the first embodiment of the present utility model;

fig. 14 shows a second schematic structural diagram of the relay according to the first embodiment of the present utility model;

fig. 15 is a schematic view showing a structure of a contact container in a relay according to a first embodiment of the present utility model;

fig. 16 is a schematic view showing a structure of a push rod unit in a relay according to a first embodiment of the present utility model;

fig. 17 is a schematic diagram of a movable reed in a relay according to a second embodiment of the present utility model;

fig. 18 shows a second schematic structural diagram of a movable reed in a relay according to a second embodiment of the present utility model;

Fig. 19 shows a third schematic structural diagram of a movable reed in a relay according to a second embodiment of the present utility model;

fig. 20 shows a schematic structural diagram of a movable reed in a relay according to a second embodiment of the present utility model;

fig. 21 shows a fifth structural schematic diagram of a movable reed in a relay according to a second embodiment of the present utility model;

fig. 22 shows a schematic structural diagram of a movable reed in a relay according to a second embodiment of the present utility model;

fig. 23 shows a schematic structural diagram of a movable reed in a relay according to a third embodiment of the present utility model;

fig. 24 shows a second schematic structural diagram of a movable reed in a relay according to a third embodiment of the present utility model.

Wherein reference numerals are as follows:

1. a contact vessel; 2. a contact assembly; 3. an anti-short circuit component; 4. a pushing assembly; 5. an arc extinguishing unit; 7. a first arc-separating member;

11. an insulating cover; 12. a frame piece;

21. a stationary contact lead-out end; 22. a movable reed; 220. a first contact portion; 221. a thrust section; 2211. a through hole; 222. a first arc isolation groove; 223. a mounting groove; 2231. a first mounting portion; 2232. a fixing part; 2233. a second mounting portion; 225. arc-isolating ribs;

31. an upper magnetizer; 32. a lower magnetizer;

41. A push rod unit; 411. a push rod; 412. a limit protrusion; 413. a base;

42. a U-shaped bracket; 421. a limiting hole;

43. an elastic member;

44. an electromagnet unit; 441. a coil former; 442. a coil; 443. a movable iron core; 444. a stationary core; 445. a U-shaped yoke; 446. a magnetic conduction cylinder; 447. a spring;

51. an arc extinguishing magnet; 52. a yoke iron clip;

70. a column; 71. a first step; 72. a first gap; 73. a first guide slit; 74. a limit part; 75. an arc isolation ring; 76. and a connecting part.

Detailed Description

The technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present utility model. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present utility model, and it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of the utility model.

In the description of the present utility model, the terms "second," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like in the exemplary embodiments of the present utility model are described in terms of the drawings, and should not be construed as limiting the exemplary embodiments of the present utility model. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

Example 1

The present embodiment provides a contact unit, as shown in fig. 1-2, which includes a contact assembly 2, the contact assembly 2 including a movable contact spring 22, a pair of stationary contact terminals 21, the movable contact spring 22 being adapted to contact with or separate from the pair of stationary contact terminals 21.

In the contact unit provided in this embodiment, the movable reed 22 is in contact with or separated from the pair of stationary contact terminals 21, and when the movable reed 22 is in contact with the stationary contacts at the bottoms of the pair of stationary contact terminals 21, current is enabled to flow in from one stationary contact terminal 21, and current flows out from the other stationary contact terminal 21 after passing through the movable reed 22, so that load communication is enabled.

When the movable reed 22 is separated from the fixed contacts at the bottoms of the pair of fixed contact leading-out ends 21, the electric arc can be automatically disconnected along with the separation of the movable reed 22 and the fixed contacts between the fixed contact leading-out ends 21 and the magnetic blow-out arc if the electric arc is elongated to a certain extent; if the electric arc is not stable enough on the moving contact, the electric arc is transferred on the surface of the moving reed 22 or the static contact leading-out end 21, the electric arc can not be extinguished mainly along the magnetic blow-out arc path, and finally the electric arc can not be broken, and even the relay is burnt out by explosion.

In order to solve this problem, as shown in fig. 2 to 5, the contact unit provided in this embodiment further includes an arc-isolating structure disposed outside the movable reed 22, the arc-isolating structure being used for blocking arc transfer.

In the contact unit provided by the embodiment, the arc isolation structure is arranged outside the movable reed 22, and the arc isolation structure can prevent arc transfer, so that the risk of arc ablation on the movable reed 22 is reduced, and protection on the movable reed 22 is realized.

Specifically, as shown in fig. 4 to 10, the arc isolation structure provided in this embodiment includes a first arc isolation member 7, the first arc isolation member 7 is mounted on the movable contact spring 22, and the first arc isolation member 7 is used for blocking arc transfer.

In the arc isolation structure provided by the embodiment, because the fixed contact leading-out end 21 and the movable reed 22 are separated easily to generate an arc, the first arc isolation piece 7 is arranged on the movable reed 22, and the first arc isolation piece 7 is closer to an arc starting point, so that the transfer of the arc is better hindered.

Wherein a first step 71 is provided between the first arc-separating member 7 and the movable reed 22 for blocking arc transfer; and/or a first gap 72 is provided between the first arc barrier 7 and the movable reed 22 for hindering arc transfer.

In the arc isolation structure provided by the embodiment, the first step 71 and/or the first gap 72 are arranged at the contact position of the first arc isolation member 7 and the movable reed 22 and on the moving path of the arc, namely, the bending is formed on the arc path, so that the kinetic energy of the arc can be lost, and the transfer of the arc can be better blocked. Wherein, the arc transfer direction has two directions: first, the first step 71 and/or the first gap 72 can prevent the arc from transferring along the direction that the movable reed 22 approaches to the pair of stationary contact leading-out ends 21, so as to avoid the condition that two groups of stationary contacts between the movable reed 22 and the pair of stationary contact leading-out ends 21 generate arc short circuit; second, the first step 71 and/or the first gap 72 can prevent the arc from transferring downwards along the movable reed 22 in a direction away from the stationary contact leading-out end 21, further reduce the erosion of the arc to the outer wall of the movable reed 22, and improve the arc extinguishing capability and effect, thereby improving the load breaking capability between the movable reed 22 and the movable contact and the stationary contact corresponding to the stationary contact leading-out end 21.

In one embodiment, the first arc barrier 7 is made of an insulating material.

Specifically, the first arc isolation member 7 can be made of insulating materials such as ceramics, glass, rubber or plastics, and the first arc isolation member 7 made of the insulating materials has good arc breaking or cooling performance, strong arc extinguishing capability and good arc extinguishing effect.

It will be appreciated that in some other embodiments, the first arc splitter 7 may also be made of a metallic material.

In one embodiment, the first arc-isolating piece 7 is sleeved on the outer wall of the movable reed 22.

The first arc-isolating piece 7 can also be called an arc-isolating sleeve, and the first arc-isolating piece 7 is sleeved on the outer wall of the movable reed 22 so as to conduct arc-isolating treatment on the outer peripheral side of the contact area corresponding to the movable contact of the movable reed 22, so that arc isolation can be more comprehensively realized, and arc extinction is facilitated.

It can be understood that the number of the first arc-isolating pieces 7 is two, and the two first arc-isolating pieces 7 are respectively arranged at two ends of the movable reed 22 along the length direction of the movable reed 22.

By adopting the mode, two groups of movable contact points between the movable reed 22 and the fixed contact point leading-out end 21 are respectively corresponding to the two first arc isolation parts 7, so that each group of movable contact points can isolate arcs by utilizing one corresponding first arc isolation part 7, double arc extinction can be realized, and the arc extinction thoroughness is improved.

In one embodiment, as shown in fig. 4 to 10, the first arc-separating member 7 includes a pillar 70, and a top surface of an end of the pillar 70 facing the stationary contact terminal 21 protrudes from a top surface of an end of the movable contact spring 22 facing the stationary contact terminal 21, such that a first step 71 is formed between the top surface of the pillar 70 and the top surface of the movable contact spring 22.

Because the top surface of the upright post 70 in the first arc isolation piece 7 protrudes out of the top surface of the movable reed 22, the top of the upright post 70 and the top surface of the movable reed 22 are not arranged in a coplanar manner, or the upright post 70 is not embedded in the top surface of the movable reed 22, a first step 71 is formed between the top of the upright post 70 protruding out of the top surface of the movable reed 22, and the first step 71 is closer to an arc starting point, thereby isolating and cutting off a transfer path of an arc on the top surface of the movable reed 22, and preventing the arc from being transferred to the central line of the length direction of the movable reed 22, avoiding arc short circuit generated by two groups of movable contacts between the movable reed 22 and a pair of fixed contact leading-out ends 21, enabling the arc to be efficiently extinguished on an originally set magnetic field arc extinguishing path, and improving the arc extinguishing capability.

In one embodiment, as shown in fig. 4-10, the side wall of the movable contact 22 is provided with a mounting groove 223, the post 70 is at least partially disposed within the mounting groove 223, and the first gap 72 is disposed between the post 70 and the mounting groove 223. Wherein the first gap 72 is disposed along the axial direction of the post 70.

The side wall of the movable reed 22 is provided with the mounting groove 223, the mounting groove 223 provides an accommodating space for the stand column 70, meanwhile, the function of mounting the stand column 70 is also achieved, the outer wall of the stand column 70 and the inner wall of the mounting groove 223 are not mutually attached, a first gap 72 is arranged between the outer wall of the stand column 70 and the inner wall of the mounting groove 223, due to the existence of the first gap 72, a part of electric arc can enter the first gap 72, the first gap 72 provides an accommodating space for the electric arc, the risk that the part of electric arc is transferred along the movable reed 22 to a direction far away from the fixed contact leading-out end 21 is reduced, and the arc extinguishing effect is improved.

In one embodiment, the end of the first gap 72 facing the stationary contact terminal 21 is provided with an open end, and the end of the first gap 72 facing away from the stationary contact terminal 21 is a closed end.

The open end of the first gap 72 is for introducing an arc, and the first gap 72 has a closed end such that the first gap 72 is not entirely through-structured so that a bend may be formed in the path of the arc.

In one embodiment, as shown in fig. 4 to 10, the mounting groove 223 includes a first mounting portion 2231, the first mounting portion 2231 is disposed on a side of the movable contact 22 facing the stationary contact terminal 21, the pillar 70 is disposed through the first mounting portion 2231, and the first gap 72 is disposed between the pillar 70 and the first mounting portion 2231.

A first installation part 2231 is provided on the side wall of the movable contact spring 22 and toward the side of the stationary contact lead-out terminal 21, that is, the first installation part 2231 is located at the upper part of the side wall of the movable contact spring 22, and a first gap 72 is provided between the first installation part 2231 and the upright post 70, so that a part of the arc can directly enter the first gap 72 because the first gap 72 is closer to the position where the movable contact spring 22 and the stationary contact lead-out terminal 21 are in contact with each other.

In addition, the connection between the top surface and the side surface of the upright post 70 is an edge, the arc moves to the edge to form an arc-gathering, meanwhile, due to the existence of the first gap 72, a part of the arc can enter the first gap 72, so that a height drop appears on the arc transfer path, the drop makes the arc not easy to move in a direction away from the stationary contact leading-out end 21, and the arc extinguishing effect is improved by utilizing the combination of the edge and the drop.

In one embodiment, the first gap 72 is a horn-shaped structure, and the large mouth end of the first gap 72 is disposed toward the stationary contact terminal 21.

In one embodiment, as shown in fig. 4-10, the mounting groove 223 further includes a fixing portion 2232, where the fixing portion 2232 is in communication with the first mounting portion 2231, and the post 70 is clamped to the fixing portion 2232 for fixing the first arc isolation member 7.

Specifically, the stand column 70 is clamped to the fixing portion 2232, that is, the outer wall of the stand column 70 and the inner wall of the fixing portion 2232 are attached or in interference fit, the fixing portion 2232 plays a role in clamping and fixing the stand column 70, and the situation that the first arc isolation piece 7 is separated from the driven reed 22 is avoided.

In one embodiment, as shown in fig. 4 to 10, the mounting groove 223 further includes a second mounting portion 2233, the second mounting portion 2233 is disposed on a side of the movable contact 22 away from the stationary contact lead-out end 21, the second mounting portion 2233 is in communication with the first mounting portion 2231 through a fixing portion 2232, the pillar 70 is disposed through the second mounting portion 2233 and a first guide slit 73 is disposed between an outer wall of the pillar 70 and an inner wall of the second mounting portion 2233, and the first guide slit 73 is used for guiding the pillar 70.

The second installation part 2233 is arranged at one side of the movable contact spring 22 away from the fixed contact point leading-out end 21, namely, the second installation part 2233 is positioned at the lower part of the side wall of the movable contact spring 22, a first guide gap 73 is arranged between the first installation part 2231 and the upright post 70, and the first guide gap 73 is used for guiding the upright post 70. Since the bottom of the driven spring 22 of the upright post 70 needs to be inserted into the mounting groove 223 of the driven spring 22 when the first arc-isolating member 7 is mounted on the driven spring 22, a first guiding slit 73 is provided between the outer wall of the upright post 70 and the inner wall of the second mounting portion 2233, that is, the outer wall of the upright post 70 and the inner wall of the second mounting portion 2233 are not mutually attached, and the first guiding slit 73 provides guiding action for the upright post 70, so that the upright post 70 of the first arc-isolating member 7 is convenient to mount.

It will be appreciated that the first guide slit 73 may be a horn-shaped structure, and the large opening end of the first guide slit 73 is disposed away from the stationary contact outlet 21, and the large opening end of the first gap 72 provides an inlet for the upright post 70 to pass through, thereby further improving the convenience of installation of the first arc-isolating member 7.

In one embodiment, as shown in fig. 4 to 10, the number of the columns 70 is two, two mounting grooves 223 are provided on both sides of the movable contact 22 in the width direction of the movable contact 22 and between the inner edges of the first contact portion 220, and two columns 70 are provided corresponding to the two mounting grooves 223.

Specifically, the two upright posts 70 are disposed correspondingly in the width direction of the movable contact 22, and the transfer path of the arc to the direction toward the pair of stationary contact terminals 21 toward each other can be completely cut off by the two upright posts 70, so that the arc-separating effect is good.

In one embodiment, as shown in fig. 4 to 10, the first arc isolation member 7 further includes a limiting portion 74, where the limiting portion 74 is disposed on a side of the upright post 70 away from the movable spring 22 and can abut against the movable spring 22 for limiting the upright post 70.

When the first arc-isolating member 7 is mounted on the movable reed 22, the limiting portion 74 can abut against the movable reed 22 to initially position and limit the upright post 70 of the first arc-isolating member 7, so that the accuracy of mounting the first arc-isolating member 7 is improved.

In one embodiment, as shown in fig. 4-10, the first arc-isolating member 7 further includes an arc-isolating ring 75, and the arc-isolating ring 75 is wrapped around at least part of the side wall of the movable reed 22 at the end of the movable reed 22 along the length direction of the movable reed 22.

The arc isolating ring 75 of the first arc isolating piece 7 is wrapped at the end part of the movable reed 22 and at least part of the side wall of the movable reed 22, which is equivalent to installing an arc isolating sleeve at the outer peripheral side of the contact area of the fixed contact leading-out end 21 and the movable reed 22, reduces the ablation of the electric arc on the outer wall of the movable reed 22, prevents the electric arc from transferring downwards along the side wall of the movable reed 22, and is favorable for arc extinction. In addition, the arc isolation ring 75 is of a hollow structure, namely, a central hole is formed in the center of the arc isolation ring 75, the arc isolation ring 75 plays a role in weight reduction, and the requirement of light weight is met.

In one embodiment, as shown in fig. 4 to 10, the first arc isolating member 7 further includes a connecting portion 76, the connecting portion 76 is disposed at the bottom of the end of the movable reed 22 away from the fixed contact lead-out end 21 and is connected to two ends of the arc isolating ring 75, and the upright post 70 is disposed at the connecting portion 76.

If the arc isolating ring 75 has an open end, the arc isolating ring 75 is in an open structure, and the connecting parts 76 are respectively connected to two ends of the arc isolating ring 75, so that the first arc isolating piece 7 is in an integral structure, and the fixing effect between the first arc isolating piece 7 and the movable reed 22 is improved. Meanwhile, the connecting portion 76 is located at the bottom of the movable contact spring 22, and does not interfere with the mutual contact of the movable contact spring 22 and the stationary contact-pulling-out end 21.

It should be noted that the relay contact assembly 2 provided in this embodiment may have the first arc separating member 7, the first step 71 and the first gap 72 at the same time, and the first step 71 and the first gap 72 form a partial arc separating structure for restricting a partial arc or transfer of the arc along the movable reed 22 in a direction away from the stationary contact terminal 21 and restricting a partial arc transfer along the movable reed 22 in a direction toward the pair of stationary contact terminals 21 toward each other. The first arc-separating member 7 using an insulating material has an arc-breaking or arc-cooling property to achieve an arc-extinguishing effect.

It should be noted that, in some other embodiments, a second arc-separating member may be further disposed outside the stationary contact terminal 21 to block arc transfer and protect the stationary contact terminal 21.

In one embodiment, as shown in fig. 11, the contact unit provided in this embodiment further includes a contact container 1, where the contact container 1 includes an insulating cover 11, a movable spring 22 is movably disposed in the insulating cover 11, and a stationary contact lead-out terminal 21 is disposed through the insulating cover 11 and at least partially disposed in the insulating cover 11.

Wherein, the insulating cover 11 and the yoke plate are connected by the frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable reed 22 and the stationary contact leading-out end 21, and ensures the reliability of the relay in the use process.

In one embodiment, as shown in fig. 12, the portion where the movable contact 22 and the pair of stationary contact terminals 21 contact each other is the first contact portion 220, and the first step 71 and/or the first gap 72 are provided between the inner edges of the first contact portion 220.

Specifically, the first contact portion 220 is specifically two sets of moving contacts, and because the moving reed 22 and the pair of stationary contact terminals 21 contact each other to generate an arc, the first step 71 and/or the first gap 72 are disposed between the inner edges of the first contact portion 220, and the first step 71 and/or the first gap 72 can cut off a path for the arc to transfer laterally, so that the situation that the two sets of moving contacts generate arc short circuit is avoided.

In one embodiment, as shown in fig. 12 and 13, the movable contact 22 provided in this embodiment has a top surface of the movable contact 22 on a side of the movable contact 22 facing the stationary contact leading-out ends 21, and the top surface of the movable contact 22 is provided with an arc-shielding portion for shielding an arc from moving in a direction in which the pair of stationary contact leading-out ends 21 approach each other.

The arc isolation part is arranged on the top surface of the movable reed 22 to prevent the arc from transferring along the top surface of the movable reed 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable reed 22, preventing the arc from transferring to the central line of the length direction of the movable reed 22, avoiding the occurrence of arc short circuit generated by two groups of movable contacts between the movable reed 22 and the pair of fixed contact leading-out ends 21, enabling the arc to be efficiently extinguished on the original set magnetic field arc extinguishing path, and improving the arc extinguishing capability.

In one embodiment, as shown in fig. 12 and 13, the arc separating portion is disposed between the inner edges of the two first contact portions 220.

The contact portion between the movable reed 22 and the pair of stationary contact terminals 21 is a first contact portion 220, and an arc isolation portion is disposed between inner edges of the first contact portion 220 to cut off a path of an arc transferring to an inner side direction of the stationary contact terminals 21, so as to avoid arc shorting generated by two sets of stationary contacts between the movable reed 22 and the pair of stationary contact terminals 21, and ensure high efficiency and thoroughness of arc extinction.

The inner side specifically means a side where the pair of stationary contact terminals 21 are close to each other (Q is a direction where the pair of stationary contact terminals 21 are close to each other, M is a center line of the stationary contact terminal 21 as shown in fig. 2), or a side close to a center line of the movable reed 22 in the longitudinal direction (L is a length direction of the movable reed 22, T is a width direction of the movable reed 22 as shown in fig. 12). Accordingly, the arc isolating portion is disposed at a side of the first contact portion 220 facing the inside.

In one embodiment, the number of the arc-separating portions is two, the two arc-separating portions are disposed corresponding to the pair of stationary contact terminals 21, and the distance between the outer edges of the two arc-separating portions along the length direction of the movable contact 22 is equal to or less than the distance between the inner edges of the first contact portion 220.

Specifically, because the number of the fixed contact leading-out ends 21 is two, two arc isolating parts are arranged corresponding to the two fixed contact leading-out ends 21 and are arranged on the inner sides of the fixed contact leading-out ends 21, the arcs generated by the separation of the two groups of movable and static contacts are isolated correspondingly through the two arc isolating parts, the double arc isolating effect is achieved, and the arc isolating effect is further improved.

In one embodiment, as shown in fig. 12-13, the arc separation portion is a first arc separation groove 222; and/or the arc-isolating portion is an arc-isolating rib 225.

When the first arc-isolating part is the first arc-isolating groove 222, namely, the top surface of the movable reed 22 is provided with a concave structure, and when the first arc-isolating part is the arc-isolating rib 225, namely, the top surface of the movable reed 22 is provided with a convex structure, the two structures can solve the problem that arc transfer is rapid on the top surface of the movable reed 22 with a planar structure. The first arc isolation groove 222 and/or the arc isolation rib 225 can isolate and cut off the transfer path of the electric arc on the top surface of the movable reed 22, and prevent the electric arc from transferring to the central line of the movable reed 22 in the length direction, so as to avoid the electric arc short circuit generated by two groups of movable contacts between the movable reed 22 and the pair of stationary contact leading-out ends 21.

Specifically, the first arc separating groove 222 includes a first groove wall and a first groove bottom connected to each other. Wherein the arc moves to the junction between the first groove wall and the top surface of the movable contact spring 22 to form an arc-gathering, and the difference in height between the top surface of the movable contact spring 22 on the side toward the stationary contact lead-out end 21 and the first groove bottom serves to hinder the arc from moving toward the direction in which the pair of stationary contact lead-out ends 21 approach each other.

Because the first arc isolation groove 222 has the first groove wall and the first groove bottom which are connected with each other, the connection part between the first groove wall and the top surface of the movable reed 22 is an edge, the arc moves to the edge to form an arc gathering, meanwhile, the height difference between the top surface of the movable reed 22 and the first groove bottom is a drop on the arc transfer path, the drop makes the arc not easy to move towards the central line of the length direction of the movable reed 22, and the arc extinguishing effect is improved by utilizing the combination of the edge and the drop.

In one embodiment, as shown in fig. 7, the first arc isolating groove 222 is a through groove along the width direction of the movable reed 22.

If the first arc-separating groove 222 extends in the length direction of the movable reed 22, the arc can be transferred along a portion of the top surface of the movable reed 22 where the first arc-separating groove 222 is not provided, with a risk of arc shorting. For this reason, the first arc-separating groove 222 is provided as a through groove extending in the width direction of the movable contact 22, and since the through groove is provided so as to extend through the width direction of the movable contact 22, after the arc enters the first arc-separating groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact terminals 21 approach each other is completely cut off.

In one embodiment, the first arc-isolating slot 222 has an arc-shaped structure, and the first arc-isolating slot 222 is disposed around the stationary contact outlet 21.

Specifically, since the bottom of the stationary contact terminal 21 is similar to a cylindrical structure, the shape of the first arc-separating groove 222 is adapted to the shape of the bottom of the stationary contact terminal 21, and the arc-separating groove 222 of an arc structure is provided along the shape of the stationary contact terminal 21 and around the stationary contact terminal 21, impeding the transfer path of the arc in all directions.

It will be appreciated that the first arc-isolating grooves 222 of the arc structure extend from one side to the other side of the movable contact 22 in the width direction, and then contact portions are formed at both ends of the movable contact 22 in the length direction of the movable contact 22 and at portions where the first arc-isolating grooves 222 are not provided, the contact portions being for contact with the stationary contact terminal 21.

It should be noted that, the first arc-isolating slot 222 may be replaced by an arc-isolating rib 225, and the arrangement position and shape of the arc-isolating rib 225 are similar to those of the first arc-isolating slot 222, so that detailed description thereof will not be repeated.

The embodiment also provides a relay, which comprises the contact unit.

In the relay provided in this embodiment, the movable reed 22 of the contact unit is in contact with or separated from the pair of stationary contact terminals 21, and when the movable reed 22 is in contact with the stationary contacts at the bottoms of the pair of stationary contact terminals 21, current is enabled to flow in from one stationary contact terminal 21, and current flows out from the other stationary contact terminal 21 after passing through the movable reed 22, so that load communication is achieved.

In one embodiment, as shown in fig. 14-16, the relay further includes a push assembly 4, the push assembly 4 including a push rod unit 41, an elastic member 43, and a U-shaped bracket 42. Wherein the push rod unit 41 includes a base 413 and a push rod 411, and upper portions of the base 413 and the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable spring 22 and the elastic piece 43 are arranged in the frame structure enclosed by the U-shaped bracket 42 and the base 413, one end of the elastic piece 43 is abutted against the base 413, the other end is abutted against the movable spring 22, and the elastic piece 43 can provide elastic force, so that the movable spring 22 has a trend of being far away from the base 413 and approaching the stationary contact leading-out end 21.

Specifically, the push rod unit 41 and the U-shaped bracket 42 are engaged with each other through the stopper protrusion 412 and the stopper hole 421, and the movement force of the push rod unit 41 can be transmitted to the U-shaped bracket 42 for driving the movable contact spring 22 to move, so that the movable contact spring 22 is conveniently used to contact or separate from the pair of stationary contact lead-out terminals 21.

The pushing assembly 4 of the relay further comprises an electromagnet unit 44 (as shown in fig. 2-3), the electromagnet unit 44 being arranged on the side of the yoke plate facing away from the insulating housing 11. The push rod unit 41 is in driving connection with the electromagnet unit 44, and the push rod unit 41 is movably arranged in a driving cavity enclosed by the metal cover and the yoke plate and is abutted against the movable reed 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized, the push rod unit 41 can be driven to move, and the movable reed 22 is driven to move so as to contact with or separate from the stationary contact leading-out end 21.

The electromagnet unit 44 includes a bobbin 441, a coil 442, a stationary core 444, a movable core 443, a U-shaped yoke 445, a magnetic cylinder 446, and a spring 447. The bobbin 441 is disposed in the U-shaped yoke 445, and the bobbin 441 has a hollow cylindrical shape and is formed of an insulating material. The magnetic conductive tube 446 is inserted into the bobbin 441, and the coil 442 surrounds the bobbin 441. The stationary core 444 has a second through hole provided corresponding to the through hole of the yoke plate for the push rod unit 41 to pass therethrough. The movable iron core 443 is movably disposed in the magnetic cylinder 446 and disposed opposite to the stationary iron core 444, and the springs 447 are disposed between the stationary iron core 444 and the movable iron core 443 and can be respectively abutted thereto, and the movable iron core 443 is connected to the push rod unit 41 for being attracted by the stationary iron core 444 when the coil 442 is energized. The plunger 443 and the pushrod unit 41 may be screw-coupled, riveted, welded, or otherwise connected.

The working process of the relay provided by the embodiment is as follows:

when the coil 442 is energized, the stationary iron core 444 attracts the movable iron core 443, the movable iron core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary iron core 444 and the movable iron core 443 is compressed, and the push rod unit 41 pushes the movable reed 22 to move through the U-shaped bracket 42 and the elastic member 43, so that two ends of the movable reed 22 are respectively contacted with the two stationary contact leading-out ends 21, and the process of closing the movable contact is completed.

When the coil 442 is disconnected from the current, the stationary iron core 444 releases the attraction to the movable iron core 443, and under the elastic force of the compressed spring 447, the movable iron core 443 drives the push rod unit 41 to move downward, so that the movable contacts at both ends of the movable reed 22 are separated from the two stationary contact lead-out terminals 21, thereby completing the process of moving and stationary contact separation.

When the short-circuit load is large, under the action of the short-circuit current, an electric repulsive force is generated between the movable reed 22 and the stationary contact leading-out end 21 to cause the contact to spring open, so that the contact is drawn and burned violently, and even explosion can possibly occur.

For this reason, the relay provided in this embodiment further includes a short circuit prevention member 3 (as shown in fig. 2 to 3), and the short circuit prevention member 3 is disposed at least on the upper side of the movable contact 22 in the axial direction of the stationary contact lead-out end 21, and generates a suction force for preventing an electric repulsive force between the movable contact 22 and the stationary contact lead-out end 21 when a large fault current occurs in the movable contact 22.

The anti-short circuit assembly 3 may also be referred to as a short circuit ring disposed between the pair of stationary contact terminals 21, and for a high voltage dc relay, the first arc-isolating member 7 may prevent the arc from being attracted by the anti-short circuit assembly 3 to attract the arc in a direction in which the pair of stationary contact terminals 21 approach each other, thereby preventing insulation between the contacts from being reduced or arc shorting.

Specifically, the thrust portion 221 of the movable reed 22 is disposed between the two contact portions, the anti-short-circuit assembly 3 is disposed on the thrust portion 221 of the movable reed 22, two sides of the thrust portion 221 are planar structures, and the bilateral planes of the thrust portion 221 provide convenience and reliability for mounting the anti-short-circuit assembly 3, and the anti-short-circuit assembly 3 is used for resisting electric repulsive force between the movable reed 22 and the stationary contact leading end 21.

In one embodiment, the anti-short circuit assembly 3 comprises an upper magnetizer 31 and a lower magnetizer 32, wherein the upper magnetizer 31 is arranged at one side of the movable reed 22 near the stationary contact leading-out end 21. The lower magnetizer 32 is at least partially disposed on a side of the movable reed 22 away from the stationary contact lead-out end 21 to form a magnetically conductive loop between the upper magnetizer 31 and the lower magnetizer 32. The upper magnetizer 31 and the lower magnetizer 32 can be made of materials such as iron, cobalt, nickel, alloys thereof and the like.

The upper magnetizer 31 is disposed at a side of the thrust portion 221 near the stationary contact lead-out end 21, the lower magnetizer 32 is disposed at a side of the thrust portion 221 far from the stationary contact lead-out end 21, that is, the lower magnetizer 32 is fixed below the thrust portion 221 of the movable reed 22, a magnetic conductive loop can be formed between the upper magnetizer 31 and the lower magnetizer 32, and the lower magnetizer 32 can move along with the movable reed 22 in a direction near the stationary contact lead-out end 21. When the movable reed 22 has a large fault current, because the upper magnetizer 31 is positioned above the movable reed 22, the lower magnetizer 32 is positioned below the movable reed 22, which is equivalent to that the movable reed 22 is clamped between the upper magnetizer 31 and the lower magnetizer 32, when the upper magnetizer 31 generates suction force to the lower magnetizer 32, the suction force plays a role in attracting and pulling the movable reed 22 and is used for resisting electric repulsive force generated between the movable reed 22 and the fixed contact leading-out end 21 due to fault current, so that the condition of arc explosion caused by mutual disconnection between the movable reed 22 and the fixed contact leading-out end 21 is avoided, and the contact reliability and safety of the movable reed 22 and the fixed contact leading-out end 21 are ensured.

In one embodiment, the upper magnetizer 31 may have a linear structure, the upper magnetizer 31 is correspondingly disposed at a position between two contact portions of the movable reed 22, and the upper magnetizer 31 may extend along the width direction of the movable reed 22 for matching and correspondence of the upper magnetizer 31 and the lower magnetizer 32. The lower magnetizer 32 has a U-shaped structure, and an opening of the lower magnetizer 32 is arranged towards the movable reed 22, so that two side arms of the lower magnetizer 32 extend towards the direction of the upper magnetizer 31, and thus the two side arms of the lower magnetizer 32 can be respectively close to or contact with two ends of the upper magnetizer 31, so as to form a surrounding magnetic conductive ring on the movable reed 22 along the width thereof. Since the contact portions of both ends of the movable reed 22 in the length direction thereof are movable contacts, the surrounding magnetic ring formed in the width direction of the movable reed 22 does not interfere, and when a large fault current occurs in the movable reed 22, electromagnetic attraction force in the pressure direction of the movable contacts is generated so as to resist electric repulsive force generated between the movable reed 22 and the stationary contact leading-out end 21 due to the fault current.

It should be noted that, the U-shaped bracket 42 may be fixedly connected to the upper magnetizer 31, the lower magnetizer 32 is connected to the bottom of the movable reed 22, the movable reed 22 and the lower magnetizer 32 form a movable member, and the short-circuit resisting assembly 3 and the movable reed 22 are disposed between the U-shaped bracket 42 and the push rod unit 41.

In one embodiment, as shown in fig. 11, the relay further comprises an arc extinguishing unit 5, the arc extinguishing unit 5 being arranged in the hollow chamber of the housing for extinguishing an arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The quenching magnets 51 may be permanent magnets, and each quenching magnet 51 may be substantially rectangular parallelepiped. The two arc extinguishing magnets 51 are provided on both sides of the insulating cover 11, respectively, and are disposed opposite to each other along the longitudinal direction of the movable reed 22.

In the present embodiment, two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The polarities of the faces of the two quenching magnets 51 facing each other are opposite. That is, the left side of the arc extinguishing magnet 51 located on the left side of the insulating cover 11 is an S-pole and the right side is an N-pole, and the left side of the arc extinguishing magnet 51 located on the right side of the insulating cover 11 is an S-pole and the right side is an N-pole.

Of course, the polarities of the surfaces of the two arc extinguishing magnets 51 facing each other may be designed to be identical, for example, the left surface of the arc extinguishing magnet 51 located on the left side of the insulating cover 11 is an S-pole and the right surface is an N-pole, and the left surface of the arc extinguishing magnet 51 located on the right side of the insulating cover 11 is an N-pole and the right surface is an S-pole.

Thus, by providing two opposing arc extinguishing magnets 51, a magnetic field can be formed around the contact assembly 2.

Therefore, the arc generated between the stationary contact terminal 21 and the movable contact 22 is elongated in a direction away from each other by the magnetic field, and arc extinction is achieved.

The arc extinguishing unit 5 further includes two yoke clips 52, and the two yoke clips 52 are provided corresponding to the positions of the two arc extinguishing magnets 51. And, two yoke clips 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. Through the design that yoke iron clamp 52 encircles arc extinguishing magnet 51, can avoid the magnetic field that arc extinguishing magnet 51 produced to outwards spread, influence the arc extinguishing effect. The yoke iron clips 52 are made of a soft magnetic material. Soft magnetic materials may include, but are not limited to, iron, cobalt, nickel, alloys thereof, and the like.

Example two

The present embodiment is similar to the embodiment, and differs only in the structure of the first arc separating groove 222.

As shown in fig. 17 to 19, the first arc isolation groove 222 provided in this embodiment is at least one of a linear structure, a convex structure and an X-shaped structure.

Specifically, as shown in fig. 17, the first arc isolation groove 222 has a linear structure, so that the first arc isolation groove 222 has a groove structure, the structure is simple, the production and the processing are convenient, and the overall structural strength of the movable reed 22 is relatively high because the groove width of the first arc isolation groove 222 along the length direction of the movable reed 22 is relatively narrow.

As shown in fig. 18, the first arc isolation groove 222 has a convex structure, so that the first arc isolation groove 222 has a fold line groove structure, and the bending degree of the arc transmission path is increased, thereby improving the arc extinguishing effect.

As shown in fig. 19, the first arc isolation groove 222 is an X-shaped structure, and the X-shaped structure includes two slots disposed in a cross manner, so that the electric arc on a single side can be isolated from a transmission path through the two slots, and the dual arc isolation effect is achieved, and the isolation and arc extinguishing effects are good.

It is to be understood that the shapes of the two first arc separation grooves 222 in this embodiment may be the same or different, for example: one of the first arc isolating grooves 222 is of a convex structure, and the other first arc isolating groove 222 is of a linear structure.

It is to be understood that the first arc isolation groove 222 provided in this embodiment includes, but is not limited to, a linear structure and an X-shaped structure, and may also be an S-shaped structure, a conical structure, etc., and the specific shape thereof may be adjusted according to actual production conditions.

It should be noted that, as shown in fig. 20-22, the first arc-isolating slot 222 may be replaced by an arc-isolating rib 225, and the arrangement position and shape of the arc-isolating rib 225 are similar to those of the first arc-isolating slot 222, so that detailed description thereof will not be repeated.

Example III

This embodiment is similar to the embodiment, and differs only in the number and structure of the arc-isolating structures.

As shown in fig. 23 to 24, the number of arc-isolating parts provided in this embodiment is one, and the portions of the movable contact spring 22, which are not provided with arc-isolating parts, are respectively abutted against a pair of stationary contact lead-out terminals 21 along the two sides of the movable contact spring 22 in the length direction.

When the arc isolating part is specifically the first arc isolating groove 222, since one first arc isolating groove 222 is disposed between the pair of stationary contact leading-out ends 21, the first arc isolating groove 222 is wider along the length direction of the movable reed 22, so that the part of the movable reed 22, which is not provided with the first arc isolating groove 222, is disposed at the two ends of the movable reed 22 along the length direction of the movable reed 22, and the two contact parts are respectively two contact parts, which are correspondingly abutted against the pair of stationary contact leading-out ends 21, the arc isolating process of two sets of movable contacts can be realized by utilizing one first arc isolating groove 222, and the movable reed has simple structure and lower production cost.

In one embodiment, the distance between the two side edges of the first arc separating groove 222 along the length direction of the movable reed 22 is smaller than or equal to the distance between the bottoms of the pair of stationary contact leading-out ends 21.

Specifically, the first arc-isolating slot 222 extends along the slot width of the movable reed 22 in the length direction to near the inner edge of the bottom of the fixed contact lead-out end 21 or is flush with the inner edge of the bottom of the fixed contact lead-out end 21, so that the edge between the first slot wall of the first arc-isolating slot 222 and the top surface of the movable reed 22 is as close to the bottom of the fixed contact lead-out end 21 as possible, the arc can be concentrated on the edge as soon as possible, and the risk of the arc transferring to the center line direction of the movable reed 22 is reduced by utilizing the drop between the top surface of the movable reed 22 and the first slot bottom of the first arc-isolating slot 222.

It should be noted that, as shown in fig. 24, the first arc-isolating slot 222 may be replaced by an arc-isolating rib 225, and the arrangement position and shape of the arc-isolating rib 225 are similar to those of the first arc-isolating slot 222, so that detailed description thereof will not be repeated.

Example IV

This embodiment is similar to the first embodiment, except that the movable spring 22 is added to the first or second embodiment.

The movable contact 22 according to the present embodiment may further be provided with a second arc-isolating groove (not shown) on a side wall of the movable contact 22, the second arc-isolating groove being configured to block movement of the arc toward a direction in which the pair of stationary contact terminals 21 approach each other.

The movable reed 22 provided in this embodiment sets up the second arc isolation groove in movable reed 22 lateral wall, blocks that the electric arc shifts to movable reed 22 length direction's central line along movable reed 22 lateral wall to the isolated and transfer path of cutting off electric arc at movable reed 22 lateral wall avoids appearing the electric arc short circuit that two sets of movable contacts between movable reed 22 and a pair of stationary contact terminal 21 produced, makes the electric arc can high-efficient arc extinction on the magnetic field arc extinction route of original settlement, has improved the extinction ability.

In one embodiment, the second arc isolating slot is disposed between the inner edges of the two first contact portions 220.

In other words, the second arc isolation groove is disposed at the inner side of the stationary contact leading-out end 21 to cut off the path of the arc transferred to the inner side direction of the stationary contact leading-out end 21, so as to avoid the arc short circuit generated by two groups of moving and static contacts between the moving reed 22 and the pair of stationary contact leading-out ends 21, and ensure the high efficiency and the thoroughness of arc extinction.

In one embodiment, the number of the second arc isolating grooves is plural, and the second arc isolating grooves are arranged at two sides of the movable reed 22 along the length direction of the movable reed 22; and/or the number of the second arc isolating grooves is a plurality of, and the second arc isolating grooves are arranged on two sides of the movable reed 22 along the width direction of the movable reed 22.

Specifically, the number of the second arc isolation grooves is four, two second arc isolation grooves are formed in each side of the movable reed 22 along the length direction of the movable reed, two second arc isolation grooves are formed in each side of the movable reed 22 along the width direction of the movable reed, and the four second arc isolation grooves are formed in four corners of the thrust portion 221 of the movable reed 22, so that an arc can be isolated by the second arc isolation grooves no matter the arc is transferred along any direction along the side wall of the movable reed 22, and the arc isolation effect is further improved.

In one embodiment, the second arc-isolating slot includes a second slot wall and a second slot bottom that are connected to each other; wherein the arc moves to the junction between the second groove wall and the side wall of the movable contact spring 22 to form an arc-gathering, and the difference in height between the side wall of the movable contact spring 22 and the second groove bottom serves to hinder the arc from moving toward the direction in which the pair of stationary contact terminals 21 approach each other.

Because the second arc isolation groove is provided with a second groove wall and a second groove bottom which are connected with each other, the joint between the second groove wall and the side wall of the movable reed 22 is an edge, the arc moves to the edge to form an arc gathering, meanwhile, the height difference between the side wall of the movable reed 22 and the second groove bottom is a drop of the arc along the transfer path of the side wall of the movable reed 22, the drop makes the arc not easy to move towards the central line of the length direction of the movable reed 22, and the arc extinguishing effect is improved by utilizing the combination of the edge and the drop.

In one embodiment, the second arc separation groove is a through groove along the axial direction of the stationary contact leading-out terminal 21.

If the second arc-isolating groove extends along the length direction of the movable reed 22, the arc can be transferred along the portion of the side wall of the movable reed 22 where the second arc-isolating groove is not provided, and there is a risk of arc shorting. For this reason, the second arc-separating groove is provided as a through groove in the axial direction of the stationary contact leading-out terminal 21, and since the through groove is provided in the height direction penetrating the movable contact spring 22, after the arc enters the second arc-separating groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 approach each other is completely cut off.

It should be noted herein that the movable reed shown in the drawings and described in the present specification is merely one example of the principles of the present utility model. It will be clearly understood by those of ordinary skill in the art that the principles of the present utility model are not limited to any details or any components of the devices shown in the drawings or described in the specification.

Claims (20)

1. An arc isolation structure, comprising:

the first arc-isolating piece is arranged on the movable reed, the movable reed is used for contacting with or separating from a pair of stationary contact leading-out ends, and the first arc-isolating piece is used for preventing arc transfer.

2. The arc isolation structure according to claim 1, wherein the first arc isolation member is sleeved on the outer wall of the movable reed.

3. The arc isolating structure according to claim 1, wherein a first step is provided between the first arc isolating member and the movable reed for inhibiting arc transfer; and/or the number of the groups of groups,

a first gap is arranged between the first arc separation piece and the movable reed and used for blocking arc transfer.

4. The arc isolating structure according to claim 3, wherein the contact portion between the movable contact spring and the pair of stationary contact terminals is a first contact portion, and the first step and/or the first gap is disposed between inner edges of the first contact portion.

5. The arc isolating structure as defined in claim 3, wherein the first arc isolating member includes a pillar, and the top surface of the pillar facing the stationary contact leading-out end protrudes from the top surface of the movable contact leading-out end facing the stationary contact leading-out end, so that the first step is formed between the top surface of the pillar and the top surface of the movable contact.

6. The arc isolating structure according to claim 5, wherein the side wall of the movable spring is provided with a mounting groove, the upright is at least partially disposed in the mounting groove, and the first gap is disposed between the upright and the mounting groove.

7. The arc separation structure according to claim 6, wherein the first gap is provided along an axial direction of the pillar.

8. The arc separation structure of claim 6, wherein an end of the first gap facing the stationary contact lead-out end is provided with an open end, and an end of the first gap facing away from the stationary contact lead-out end is a closed end.

9. The arc isolating structure according to claim 6, wherein the mounting groove comprises a first mounting portion, the first mounting portion is disposed on a side of the movable contact spring facing the stationary contact leading-out end, the upright post is disposed on the first mounting portion in a penetrating manner, and the first gap is disposed between the upright post and the first mounting portion.

10. The arc isolation structure of claim 9, wherein the mounting groove further comprises a fixing portion, the fixing portion is communicated with the first mounting portion, and the upright post is clamped to the fixing portion for fixing the first arc isolation member.

11. The arc isolating structure according to claim 10, wherein the mounting groove further comprises a second mounting portion, the second mounting portion is disposed on a side, away from the stationary contact leading-out end, of the movable contact, the second mounting portion is communicated with the first mounting portion through the fixing portion, the upright post penetrates through the second mounting portion, and a first guide gap is disposed between an outer wall of the upright post and an inner wall of the second mounting portion, and the first guide gap is used for guiding the upright post.

12. The arc isolating structure according to claim 5, wherein the first arc isolating member further comprises a limiting portion, and the limiting portion is disposed on a side of the upright column away from the movable reed and can abut against the movable reed for limiting the upright column.

13. The arc isolating structure according to claim 5, wherein the first arc isolating member further comprises an arc isolating ring, and the arc isolating ring is wrapped around the end of the movable reed along the length direction of the movable reed and at least part of the side wall of the movable reed.

14. The arc isolating structure according to claim 13, wherein the first arc isolating member further comprises a connecting portion, the connecting portion is disposed at the bottom of the movable contact spring far away from one end of the stationary contact leading-out end and is respectively connected to two ends of the arc isolating ring, and the upright post is disposed at the connecting portion.

15. A contact unit comprising a movable contact spring, a pair of stationary contact terminals, and an arc-isolating structure according to any one of claims 1 to 14, wherein the movable contact spring is configured to contact with or separate from the pair of stationary contact terminals, the arc-isolating structure is disposed outside the movable contact spring, and the arc-isolating structure is configured to hinder arc transfer.

16. The contact unit according to claim 15, wherein a side of the movable contact spring toward the stationary contact leading-out end is a top surface of the movable contact spring, the top surface of the movable contact spring being provided with an arc-shielding portion for shielding an arc from moving toward a direction in which a pair of the stationary contact leading-out ends approach each other.

17. The contact unit of claim 16, wherein the arc-isolating portion is a first arc-isolating slot; and/or the number of the groups of groups,

the arc isolation part is an arc isolation rib.

18. The contact unit according to claim 16, wherein a portion where the movable contact spring and the pair of stationary contact terminals are in contact with each other is a first contact portion, and the arc-isolating portion is provided between inner edges of the first contact portion.

19. A relay comprising a contact unit according to any one of claims 15-18.

20. The relay of claim 19, further comprising a short circuit resistant assembly disposed on at least a side of the movable contact spring facing the stationary contact lead-out terminal, the movable contact spring being configured to generate a suction force against an electromotive repulsive force between the movable contact spring and the stationary contact lead-out terminal upon occurrence of a large fault current.