CN107452549B

CN107452549B - Relay with a movable contact

Info

Publication number: CN107452549B
Application number: CN201610378408.1A
Authority: CN
Inventors: 曾志; 姚保同; 汪鲁建; 刘斯源
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2016-05-31
Filing date: 2016-05-31
Publication date: 2020-03-31
Anticipated expiration: 2036-05-31
Also published as: CN107452549A

Abstract

The invention discloses a relay, comprising: the device comprises a shell, a bottom plate and a driving device, wherein a static contact group is arranged on the shell and comprises two mutually insulated static contacts; the bottom plate comprises a plate body, a movable contact group arranged on the plate body and corresponding to the fixed contact group, and an arc extinguishing side plate arranged on the plate body and extending upwards, wherein the movable contact group comprises two movable contacts, and at least one of the two movable contacts of the movable contact group is positioned on the inner side of the arc extinguishing side plate and is electrically conducted through the fuse. According to the relay provided by the embodiment of the invention, the fuse realizes the functions of overload protection and short-circuit protection, so that the safety of a circuit system with the relay is improved, and fire and the like caused by overcurrent or short circuit are avoided.

Description

Relay with a movable contact

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a relay.

Background

In the using process of the relay, the short circuit may cause the problems of overlarge load current or circuit sintering and the like, so that the product loses functions and causes using faults.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a relay, which reduces or avoids potential safety hazards caused by overhigh load current or short circuit.

A relay according to an embodiment of the present invention includes: the device comprises a shell, wherein a static contact group is arranged on the shell and comprises two mutually insulated static contacts; the bottom plate comprises a plate body, a movable contact group which is arranged on the plate body and corresponds to the fixed contact group, and an arc extinguishing side plate which is arranged on the plate body and extends upwards, wherein the movable contact group comprises two movable contacts, the two movable contacts of at least one movable contact group are positioned on the inner side of the arc extinguishing side plate and are electrically conducted through the fuse, the bottom plate is movably arranged in the shell between a conducting position and a disconnecting position, when the bottom plate is positioned at the conducting position, the movable contact group is in contact with the fixed contact group to enable the two fixed contacts of the fixed contact group to be electrically conducted, and when the bottom plate is positioned at the disconnecting position, the movable contact group is separated from the fixed contact group to enable the two fixed contacts of the fixed contact group to be electrically conducted; a drive device coupled to the base plate to drive the base plate to move between the on position and the off position.

According to the relay provided by the embodiment of the invention, the fuse realizes the functions of overload protection and short-circuit protection, so that the safety of a circuit system with the relay is improved, and fire and the like caused by overcurrent or short circuit are avoided.

In addition, the relay according to the above embodiment of the present invention may further have the following additional technical features:

in some embodiments of the present invention, a plurality of notches are disposed on the arc-extinguishing side plate, the notches extend downward from an upper surface of the arc-extinguishing side plate, the plurality of notches are disposed adjacent to the two moving contacts of the moving contact group respectively, and the plurality of notches are disposed outside the two moving contacts of the moving contact group.

Furthermore, the arc extinguishing side plates comprise two movable contacts corresponding to the two movable contacts of the movable contact group respectively, the arc extinguishing side plates are plate-shaped, extend along the vertical direction, and have U-shaped horizontal sections, the open ends of the two arc extinguishing side plates are opposite, the two movable contacts of the movable contact group are arranged on the inner sides of the corresponding arc extinguishing side plates respectively, and the notches are formed in the closed ends of the arc extinguishing side plates.

Advantageously, the plate body is flat, the two arc extinguishing side plates are respectively arranged at two ends of the plate body, and the arc extinguishing side plates extend along the end edges of the plate body.

In some embodiments of the present invention, when the bottom plate is located at the conducting position, lower ends of two stationary contacts of the stationary contact group extend into an inner side of the arc extinguishing side plate.

In some embodiments of the invention, the outer side of the base plate is provided with a magnet.

In some embodiments of the present invention, both ends of the fuse are connected to the plate body, and a middle portion of the fuse protrudes upward.

In some embodiments of the invention, the fuse is welded to the plate body.

In some embodiments of the present invention, the plate body and the arc extinguishing side plate are an integrally formed ceramic piece.

In some embodiments of the invention, the housing comprises: a housing, a bottom of which is open; the supporting plate is arranged below the shell to seal the bottom of the shell; and the connecting table is respectively connected with the shell and the supporting plate.

Further, the shell is a ceramic shell.

In some embodiments of the invention, the enclosure is filled with hydrogen or helium gas.

In some embodiments of the present invention, the driving device is connected to the bottom of the housing, and the driving device includes: the upper end of the sleeve is connected with the shell; the limiting column is arranged at the upper part in the sleeve and is connected with the shell; the iron core is arranged at the lower part in the sleeve and can move up and down; one end of the driving rod is connected with the iron core, and the other end of the driving rod is connected with the plate body; and the reset spring is sleeved outside the driving rod, and two ends of the reset spring respectively abut against the iron core and the limiting column.

Further, the upper end of actuating lever passes the plate body is connected with jump ring and packing ring, the jump ring card is in on the actuating lever, the packing ring is established the jump ring with between the plate body, the outside of actuating lever is equipped with and is used for often promoting the plate body makes the jump ring compresses tightly the buffer spring of plate body, buffer spring's upper end is supported on the plate body and the lower extreme supports the actuating lever with on one of the diapire of casing.

Advantageously, the upper end of the driving rod is sleeved with an insulating sheath for separating the driving rod from the plate body, and the upper end of the buffer spring abuts against the insulating sheath.

Drawings

Fig. 1 is a cross-sectional view of a relay according to an embodiment of the present invention in a state where the base plate is located at the off position.

Fig. 2 is a cross-sectional view of the relay according to one embodiment of the present invention shown in fig. 1 in another state, the base plate being in the on position.

Fig. 3 is a schematic view of the base plate of the relay of one embodiment of the present invention shown in fig. 1, wherein the arrows show the direction of arc elongation.

Fig. 4 is a schematic view of a detail of a plastic relay of the present invention shown in fig. 1.

Fig. 5 is a schematic view of the throne of fig. 4.

Reference numerals:

the relay (100) is provided with a relay,

the casing 1, the static contact set 11, the static contact 111, the shell 101, the supporting plate 102, the connecting platform 103,

a bottom plate 2, a movable contact group 21, a movable contact 211, a plate body 22, an arc extinguishing side plate 23, a notch 231,

the fuse 3 is provided with a fuse holder for holding a fuse,

the device comprises a driving device 4, a sleeve 41, a limiting column 42, an iron core 43, a driving rod 44, a return spring 45, an insulating sheath 46, a buffer spring 47, a clamp spring 48 and a gasket 49.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the related art, because there is no overload protection device, when the relay is switched on, once the load current is too large or the circuit is short-circuited, sintering is easily caused, so that the function of the product is lost and danger is caused. In addition, the technology has no arc extinguishing device, the arc discharge time is long, and the service life of the product is short. In order to solve at least one of the technical problems in the related art to a certain extent, the application provides a relay which is high in safety and stability.

Referring to fig. 1 to 5, a relay 100 according to an embodiment of the present invention includes: a housing 1, a bottom plate 2 and a driving device 4.

Specifically, the housing 1 is provided with a stationary contact group 11, and the stationary contact group 11 includes two stationary contacts 111 insulated from each other. The bottom plate 2 comprises a plate body 22, a movable contact group 21 and an arc extinguishing side plate 23, the movable contact group 21 is arranged on the plate body 22, the movable contact group 21 corresponds to the fixed contact group 11, the movable contact group 21 comprises two movable contacts 211, and the two movable contacts 211 of the movable contact group 21 are insulated from each other.

The arc extinguishing side plate 23 extends upward from the plate body 22, and the two moving contacts 211 of at least one moving contact group 21 are arranged on the inner side of the arc extinguishing side plate 23 and are electrically conducted through the fuse 3. That is, the two movable contacts 211 of at least one movable contact group 21 are not only disposed inside the arc-extinguishing side plate 23 but also electrically conducted through the fuse 3. Preferably the fuse 3 is provided on the base plate 2.

The base plate 2 is movably arranged in the housing 1 between an on position and an off position. As shown in fig. 2, when the base plate 2 is in the conducting position, the movable contact group 21 is in contact with the fixed contact group 11, so that the two fixed contacts 111 of the fixed contact group 11 are electrically conducted; as shown in fig. 1, when the base plate 2 is in the open position, the movable contact group 21 is separated from the fixed contact group 11, so that the two fixed contacts 111 of the fixed contact group 11 are electrically disconnected from each other.

A drive means 4 is connected to the base plate 2 for driving the base plate 2 between the on position and the off position.

Because the arc extinguishing side plate 23 is arranged on the plate body 22, and the two moving contacts 211 of at least one moving contact group 21 are positioned on the inner side of the arc extinguishing side plate 23 and are electrically connected through the fuse 3, when the bottom plate 2 is positioned at the conducting position, because the two moving contacts 211 of the moving contact group 21 are correspondingly connected with the two fixed contacts 111 of the fixed contact group 11, the two fixed contacts 111 of the fixed contact group 11 can be electrically connected through the fuse 3.

In the use of the relay 100, if a problem such as current overload or short circuit occurs, the fuse 3 is opened, so that the electrical connection between the two stationary contacts 111 of the stationary contact group 11 is broken, and the relay 100 is in an open state, thereby breaking the circuit.

According to the relay 100 of the embodiment of the invention, the arc extinguishing side plate 23 is added, and when the relay is switched between the on state and the off state, the generated arc is divided into sections, so that the arc generated when the load current is too large or the circuit is short-circuited can be buffered by the arc extinguishing device, and the arc can be quickly extinguished. Since the fuse 3 is provided in the stationary contact 111, the fuse 3 performs overload protection and short-circuit protection, thereby improving the safety of the circuit system having the relay 100 and preventing a fire or the like due to overcurrent or short-circuit.

The invention uses the fuse 3 to carry out overload protection, thereby effectively avoiding the danger caused by overhigh load current or short circuit.

One or more stationary contact sets 11 may be provided on the housing 1 of the present invention. Correspondingly, one or more movable contact groups 21 can be arranged, and two movable contacts 211 of at least one movable contact group 21 are conducted by the fuse 3 and arranged on the inner side of the arc extinguishing side plate 23. For example, there is one movable contact group 21, and two movable contacts 211 of this movable contact group 21 are conducted through a fuse and are located inside the arc extinguishing side plate 23; for another example, there are two movable contact groups 21, two movable contacts of one of the two movable contact groups 21 are conducted by a fuse and are located inside the arc extinguishing side plate 23, and two movable contacts of the other of the two movable contact groups 21 may not be conducted by a fuse and may also be arranged inside the arc extinguishing side plate 23; for another example, there are two movable contact groups 21, and two movable contacts of each of the two movable contact groups 21 are conducted by a fuse and are provided inside the arc extinguishing side plate 23.

Of course, the number of the fixed contact sets and the movable contact sets is not limited in the present invention, and for example, the number of any one of the fixed contact sets and the movable contact sets may be three, four or any other number.

Since the two movable contacts 211 of the movable contact group 21 are both mounted on the plate body 22 and the two movable contacts 211 of the movable contact group 21 are insulated from each other, an insulating layer may be coated on the surface of the plate body 22; an insulating member may be provided between the movable contact 211 and the plate body 22. Preferably, the plate body 22 is a ceramic plate body.

The arc extinguishing side plate 23 of the present invention can perform arc extinguishing and arc sectioning effects, and in order to further improve the arc extinguishing effect, the direction of the arc generated can be guided to rapidly extinguish the arc, and the direction of the arc can be guided by the notch 231.

In some embodiments of the present invention, as shown in fig. 3, the arc-extinguishing side plate 23 is provided with a notch 231, and the notch 231 extends downward from the upper surface of the arc-extinguishing side plate 23. So that the arc can be elongated along the gap 231 to guide the arc generated when the two movable contacts 211 of the movable contact group 21 are switched between off and on to different directions, quickly eliminate the arc, and improve the arc extinguishing effect of the relay.

Further, referring to fig. 1 and 3, the gap 231 includes a plurality of gaps 231, and the plurality of gaps 231 are respectively disposed adjacent to the two movable contacts 211 of the movable contact group 21, and the plurality of gaps 231 are disposed outside the two movable contacts 211 of the movable contact group 21. Wherein, taking the two moving contacts 211 of the moving contact group 21 as reference, the area between the two moving contacts 211 of the moving contact group 21 is the inner side of the two moving contacts 211 of the moving contact group 21, and the other area is the outer side of the two moving contacts 211 of the moving contact group 21, and the plurality of notches 231 in the invention are arranged at the outer sides of the two moving contacts 211 of the moving contact group 21.

Preferably, as shown in fig. 3, the arc-extinguishing side plate 23 includes two corresponding to the two stationary contacts 111 of the stationary contact group 11, and the two movable contacts 211 of the movable contact group 21 are located inside the corresponding arc-extinguishing side plate 23, respectively.

Referring to fig. 3, the two arc extinguishing side plates 23 extend in the up-down direction, and the horizontal cross sections of the two arc extinguishing side plates 23 are U-shaped, that is, the two arc extinguishing side plates 23 are U-shaped plate-like.

Further, the open ends of the two arc-extinguishing side plates 23 are opposite, here, since the two arc-extinguishing side plates 23 are both U-shaped, based on the structural characteristics of the U-shaped plates (one end of the U-shaped plate is open and the other end is closed), the open end of the U-shaped plate is referred to as an open end, and the closed end of the U-shaped plate is referred to as a closed end, the open ends of the two arc-extinguishing side plates 23 are opposite, which means that the open ends of the two arc-extinguishing side plates are open in opposite directions, and each arc-extinguishing side plate is disposed on the open side.

Further preferably, the two moving contacts 211 of the moving contact group 21 are respectively located at the inner side of the corresponding arc extinguishing side plate, and the closed section of the arc extinguishing side plate 23 is formed with the notch 231, so as to guide the arcs generated by the two pairs of fixed contacts 111 and contacts 21 to opposite directions, thereby improving the arc extinguishing effect.

Preferably, referring to fig. 3 to 5, the plate body 22 is a flat plate, two arc extinguishing side plates 23 are respectively disposed at two ends of the body, and the arc extinguishing side plates 23 extend along the edge of the end portion of the plate body 22. The arc extinguishing side plate 23 is arranged reasonably to quickly extinguish the arc.

As shown in fig. 2, in order to further improve the arc extinguishing effect, when the base plate 2 of the present invention is located at the conducting position, the lower ends of the two stationary contacts 111 of the stationary contact group 11 extend into the inner side of the arc extinguishing side plate 23. In other words, the two movable contacts 211 of one movable contact group 21 are located inside the arc-extinguishing side plate 23, and the fixed contact 111 of the fixed contact group 11 corresponding to this movable contact group 21 protrudes inside the arc-extinguishing side plate 23 when the bottom plate 2 is located at the conducting position.

Further, as shown in fig. 1, when the bottom plate 2 is located at the off position, the lower ends of the two stationary contacts 111 of the stationary contact group 11 may be located inside the arc-extinguishing side plate 23. Preferably, after the relay assembly is completed, the lower ends of the two stationary contacts 111 of the stationary contact group 11 protrude into the inner side of the arc-extinguishing side plate 23 no matter where the base plate 2 is located (the off position, the on position, and the position between off and on).

Preferably, a magnet (not shown) is provided at an outer side of the base plate 2, and an arc is guided by the magnet such that arcs generated by the two movable contacts 211 of the movable contact group 21 are directed in opposite directions, respectively, thereby effectively and rapidly performing arc extinguishing.

Referring to fig. 1 to 5, in some embodiments of the present invention, both ends of the fuse 3 are connected to the plate body 22, and a middle portion of the fuse 3 protrudes upward. The fusing part of fuse 3 is located the bellied middle part that makes progress of fuse 3, makes its plate body 22 of keeping away from with the middle part of fuse 3 is upwards protruding, can avoid 3 fusing in-process of fuse to produce the influence to bottom plate 2, but also can make things convenient for the fuse 3 to break off fast after fusing, avoids putting through once more after 3 fusing of fuse.

Preferably, the fuse 3 is welded to the plate body 22. The installation of the fuse 3 is convenient, thereby simplifying the manufacturing process of the relay 100 and reducing the manufacturing cost and time of the relay 100.

In addition, due to the good arc extinguishing and insulating effects of the ceramic member, in some embodiments of the present invention, the plate body 22 and the arc extinguishing side plate 23 are integrally formed ceramic members. Thereby improving the insulating effect of the base plate and the arc extinguishing effect of the arc extinguishing side plate 23.

In some embodiments of the present invention, the relay 100 further comprises circumferentially disposed magnets (not shown). The magnet can play a role in arc extinction.

As shown in fig. 1, in some embodiments of the invention, the cabinet 1 comprises: a housing 101, a pallet 102, and a connection table 103. Wherein the bottom of the housing 101 is opened, the tray 102 is disposed under the housing 101 to close the bottom of the housing 101, and the connection stages 103 are connected to the housing 101 and the tray 102, respectively. Through the cooperation of the housing 101 and the supporting plate 102, a sealed cavity can be formed in the housing 101 to prevent ash layer and the like from entering the casing 1, and the electrical safety can be improved. Furthermore, the case 1 is divided into the housing 101, the supporting plate 102 and the connecting table 103, so that the installation of the components such as the base plate 2 and the driving device 4 can be facilitated.

Preferably, since ceramics have better strength, high chemical and thermal stability, and are also poor conductors of electricity. Therefore, the case 101 in the present invention is a ceramic case 101. The insulating property of the casing 1 is improved to reduce the potential safety hazard.

Of course, in other embodiments of the present invention, the casing 1 may be made of other insulating materials, and the specific material of the casing 1 is not limited in the present invention, and may be adaptively selected in practical applications.

Further, the cabinet 1 is filled with hydrogen gas or helium gas. Through hydrogen and helium, can form the arc extinguishing gas layer, at the relay 100 switching process, through hydrogen and helium quick arc extinguishing, reduce the potential safety hazard.

In the airtight space that is full of hydrogen or nitrogen gas, when fuse 3 normally works and produces electric arc, under the magnetic field effect of magnet, elongate electric arc, divide into the section through the arc chute this moment, under the cooling effect of gas (hydrogen or nitrogen gas), can realize quick arc extinguishing simultaneously to can further improve relay 100's safety in utilization.

As shown in fig. 1, in some embodiments of the present invention, a driving device 4 is connected to a bottom of a cabinet 1, and the driving device 4 includes: a sleeve 41, a limit post 42, an iron core 43, a driving rod 44 and a return spring 45.

Specifically, the upper end of the sleeve 41 is connected with the casing 1, the limiting column 42 is arranged at the upper part in the sleeve 41 and connected with the casing 1, the iron core 43 is arranged at the lower part in the sleeve 41 and can move up and down, one end of the driving rod 44 is connected with the iron core 43 and the other end is connected with the plate body 22, the reset spring 45 is sleeved outside the driving rod 44, and two ends of the reset spring respectively abut against the iron core 43 and the limiting column 42. Therefore, the on-off control of the relay 100 is easily realized through the pushing mechanism, and the service performance of the relay 100 can be improved to a certain extent.

In the example of fig. 1, the lower end of the return spring 45 abuts against the iron core 43, and the upper end of the return spring 45 abuts against the stopper column 42. Therefore, under the action of the return spring 45, the action of the pushing mechanism is more stable, and the on-off control of the relay 100 is easy to realize.

In addition, the insulating sheath 46 is disposed on the plate body 22, and the plate body 22 and the driving rod 44 can be isolated by the insulating sheath 46, so that the damage and the breakdown of the low-voltage end component are avoided, and the quality and the use safety of the relay 100 are improved.

In some embodiments of the present invention, with reference to fig. 1 to 2, an upper end of the driving rod 44 (for example, an upper end of the driving rod 44 in fig. 1 or 2) passes through the plate body 22 and is connected with a clamp spring 48 and a washer 49, wherein the clamp spring 48 is clamped at the upper end of the driving rod 44, and the washer 49 is disposed between the clamp spring 48 and the plate body 22, and the washer 49 can reduce the stress of the clamp spring 48 and prevent the clamp spring 48 from falling off, so that the operation stability of the relay 100 can be further improved. A buffer spring 47 is disposed on an outer side of the driving rod 44 (e.g., a side far from the driving rod 44 in fig. 1 and 2), and the buffer spring 47 may be used to normally push the plate 22 to press the plate 22 against the clamp spring 48. This makes it possible to further smooth the operation of the drive lever 44 and improve the accuracy of the operation of the relay 100.

Specifically, a through hole (not shown) is formed in the plate body 22, an upper end of the driving rod 44 (e.g., an upper end of the driving rod 44 in fig. 1 or 2) can pass through the through hole, and a snap spring 48 and a washer 49 are provided at an end of the driving rod 44 passing through the through hole.

Wherein the upper end of the buffer spring 47 abuts against the plate body 22, and the lower end of the buffer spring 47 abuts against one of the driving lever 44 and the bottom wall of the housing.

That is, referring to fig. 1 and 2, one end of the buffer spring 47 is connected to the plate body 22 (e.g., the upper end of the buffer spring 47 in fig. 2), and the other end of the buffer spring 47 (e.g., the lower end of the buffer spring 47 in fig. 1) is connected to the plate body 22; one end of the buffer spring 47 may be connected to the plate body 22 (e.g., the upper end of the buffer spring 47 in fig. 2), and the other end of the buffer spring 47 (e.g., the lower end of the buffer spring 47 in fig. 1) may be connected to the cabinet 1.

Preferably, the upper end of the driving rod 44 is sleeved with an insulating sheath 46, the insulating sheath 46 is used for spacing the driving rod 44 and the plate body 22, so that the driving rod 44 and the plate body 22 are electrically isolated, and the upper end of the buffer spring can abut against the insulating sheath.

Specifically, as shown in fig. 2, an inner side of the via hole may be provided with an insulating sheath 46, and the insulating sheath 46 may be sleeved on an outer side of the driving rod 44. Therefore, the driving rod 44 can be protected to a certain extent, so that the accuracy and the stability of the action of the driving rod 44 can be ensured, and the use performance of the relay 100 can be improved.

Referring to fig. 1 to 5, the present invention is a relay 100 having an arc extinguishing device, which is long in arc extinguishing time and short in service life of a product due to an arc generated during an electrical life or a short circuit. This device increases arc control device, can divide into the section with the product electric arc, makes the product play the cushioning effect when load current is too big or the electric arc that the short circuit produced takes place through arc control device, and the arc extinguishing that can be faster increases product life. The structure is composed of four parts, namely a movable contact group 21, a fuse 3, an insulating sheath 46 and a plate body 22, arc extinguishing side plates 23 are arranged on two sides of the plate body 22, the two sides of the plate body 22 are the direction of emission after electric arc is generated and are filled in a closed space of hydrogen (nitrogen), when the fuse normally works to generate electric arc, after the movable contact group 21 and the fixed contact group 11 attract each other to generate the emission of the electric arc, the arc extinguishing side plates 23 divide the electric arc into sections, and the electric arc plays a role of buffering when passing through an arc extinguishing device. The movable contact 211 and the fuse 3 can be directly brazed to the plate body 22, and then the driving rod 44 is assembled, and then the washer 48 is assembled, and finally the snap spring 49 is assembled.

The invention has simple assembly, can lead the fuse and the movable contact to be brazed simultaneously, has fast heat dissipation of the bottom plate of the product and has better service life. In addition, an insulating sheath is added on the bottom plate, so that the quality of the product is better improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A relay, comprising:

the device comprises a shell, wherein a static contact group is arranged on the shell and comprises two mutually insulated static contacts;

the bottom plate comprises a plate body, a movable contact group which is arranged on the plate body and corresponds to the fixed contact group, and an arc extinguishing side plate which is arranged on the plate body and extends upwards, wherein the movable contact group comprises two movable contacts, the two movable contacts of at least one movable contact group are positioned on the inner side of the arc extinguishing side plate and are electrically conducted through a fuse, the bottom plate is movably arranged in the shell between a conducting position and a disconnecting position, when the bottom plate is positioned at the conducting position, the movable contact group is in contact with the fixed contact group to enable the two fixed contacts of the fixed contact group to be electrically conducted, and when the bottom plate is positioned at the disconnecting position, the movable contact group is separated from the fixed contact group to enable the two fixed contacts of the fixed contact group to be electrically conducted;

a drive device connected to the base plate to drive the base plate to move between the on position and the off position,

wherein, the arc extinguishing side plate is provided with a gap for guiding the direction of the electric arc,

when the bottom plate is located at the conduction position, the lower ends of the two stationary contacts of the stationary contact group extend into the inner side of the arc extinguishing side plate, and hydrogen or helium is filled in the shell.

2. The relay according to claim 1, wherein a plurality of notches are provided on the arc-extinguishing side plate, the notches extending downward from an upper surface of the arc-extinguishing side plate, the plurality of notches being respectively provided adjacent to the two moving contacts of the moving contact group, and the plurality of notches being provided outside the two moving contacts of the moving contact group.

3. The relay according to claim 2, wherein the arc-extinguishing side plates include two corresponding to the two moving contacts of the moving contact group, the arc-extinguishing side plates are plate-shaped and extend in the vertical direction, the horizontal section of the arc-extinguishing side plates is U-shaped, the open ends of the two arc-extinguishing side plates are opposite to each other, the two moving contacts of the moving contact group are respectively disposed on the inner sides of the corresponding arc-extinguishing side plates, and the notches are formed at the closed ends of the arc-extinguishing side plates.

4. The relay according to claim 3, wherein the plate body has a flat plate shape, and two arc extinguishing side plates are provided at both ends of the plate body, respectively, the arc extinguishing side plates extending along end edges of the plate body.

5. The relay according to any of claims 1-4, wherein a magnet is provided on the outside of the base plate.

6. The relay according to claim 1, wherein both ends of the fuse are connected to the plate body, and a middle portion of the fuse is protruded upward.

7. The relay according to claim 1, wherein said fuse is welded to said plate body.

8. The relay according to claim 1, wherein the plate body and the arc extinguishing side plate are an integrally molded ceramic piece.

9. The relay according to claim 1, wherein the housing comprises:

a housing, a bottom of which is open;

the supporting plate is arranged below the shell to seal the bottom of the shell;

and the connecting table is respectively connected with the shell and the supporting plate.

10. The relay according to claim 9, wherein the housing is a ceramic housing.

11. The relay according to any of claims 1-4, wherein said driving means is connected to said bottom of said housing, said driving means comprising:

the upper end of the sleeve is connected with the shell;

the limiting column is arranged at the upper part in the sleeve and is connected with the shell;

the iron core is arranged at the lower part in the sleeve and can move up and down;

one end of the driving rod is connected with the iron core, and the other end of the driving rod is connected with the plate body;

and the reset spring is sleeved outside the driving rod, and two ends of the reset spring respectively abut against the iron core and the limiting column.

12. The relay according to claim 11, wherein the upper end of the driving rod penetrates through the plate body and is connected with a clamp spring and a washer, the clamp spring is clamped on the driving rod, the washer is arranged between the clamp spring and the plate body, a buffer spring for normally pushing the plate body to enable the clamp spring to press the plate body is arranged on the outer side of the driving rod, the upper end of the buffer spring abuts against the plate body, and the lower end of the buffer spring abuts against one of the driving rod and the bottom wall of the casing.

13. The relay according to claim 12, wherein an insulating sheath is sleeved on an upper end of the driving rod to separate the driving rod from the plate body, and an upper end of the buffer spring abuts against the insulating sheath.