Short-circuit resistant relay

Abstract

The present invention discloses a short-circuit resistant relay, which relates to the technical field of relays, and includes a fixed base, a contact lead end, a push rod assembly, a first magnetic permeable sheet and a second magnetic permeable sheet, the contact lead end has at least two fixed contacts, the movable spring piece has movable contacts at both ends corresponding to the fixed contacts, the first magnetic permeable sheet is movably installed on the side of the movable spring piece toward the fixed contact along a moving direction parallel to the movable spring piece, and the second magnetic permeable sheet is installed on the side of the movable spring piece away from the fixed contact, the first magnetic permeable sheet and the second magnetic permeable sheet can form a magnetic circuit, and in the process of realizing an overstroke while the push rod assembly continues to operate, the first magnetic permeable sheet approaches the second magnetic permeable sheet within a predetermined stroke along a moving direction parallel to the movable spring piece. The short-circuit resistant relay of the present invention reduces the distance between the first magnetic permeable sheet and the second magnetic permeable sheet, making the closing of the movable contact and the fixed contact more stable and reliable, and can resist the electromotive repulsive force generated by a relatively large current during a short circuit.

Description

[Technical Field]

[0001] The present invention relates to the technical field of relays, and in particular to short-circuit tolerant relays. [Background technology]

[0002] In such a relay in the prior art, when a fault short circuit current occurs, an electromotive repulsive force occurs between the moving contact and the fixed contact, which affects the stability of the contact between the moving contact and the fixed contact.

[0003] With the rapid development of the new energy industry, automobile manufacturers and battery pack manufacturers have increasingly higher requirements for fault short-circuit current. In order to maintain the characteristics of small volume and low coil power, DC relays are required to have a short-circuit resistance function and be able to withstand the electromotive repulsive force received by the movable spring when a large fault current appears in the system.

[0004] Currently, the standard requirement for short circuit resistance in the market is that it will not burn or explode for 5 ms at at least 8000A. However, the DC relays in the prior art cannot provide sufficient contact pressure to maintain the characteristics of small volume and low coil power, i.e., the contact pressure cannot withstand the electromotive repulsive force received by the movable spring.

[0005] In order to improve the function of resisting electromotive repulsive force, in the prior art, a Chinese patent application with application number 201811125654.1 discloses a motor having a case, two fixed contacts, one movable contact piece and a driving mechanism mounted in the inner chamber of the case, the movable contact pieces being arranged facing the two fixed contacts along the longitudinal direction, the driving mechanism having a coil, a movable piece and a push rod, and further provided with a supporting and connecting member made of a ferromagnetic material for supporting and connecting the movable contact piece and a stopper member made of a ferromagnetic material, the supporting and connecting member being movably fitted to the top of the push rod together with the movable contact piece, and the stopper The member is fixedly fitted to the top of the push rod and is also located above the supporting and connecting member and the movable contact piece. When the movable contact piece is attracted to and connected to the two fixed contacts, the stopper member forms a magnetic path gap with the top side of the supporting and connecting member, thereby generating an electromagnetic attractive force with an upward force-receiving direction on the movable contact piece. In this way, when a large current flows, it can be better ensured that the movable contact piece remains attracted to the two fixed contacts, and a DC contactor with high short-circuit resistance is disclosed that greatly improves the operational stability and short-circuit resistance of the DC contactor.

[0006] However, since the push rod needs to move overtravel, a gap inevitably occurs between the supporting connection member and the stopper member, and the size of this gap is generally equal to the overstroke distance of the push rod. Because the gap between the supporting connection member and the stopper member is relatively large, the relay's ability to resist electromotive repulsive force is significantly reduced, and therefore it cannot meet the actual usage needs of large current flow in short-circuit mode.

[0007] Therefore, there is a need to propose an improved solution. Summary of the Invention [Problem to be solved by the invention]

[0008] In order to overcome at least one of the deficiencies described in the above prior art, the present invention provides a short-circuit resistant relay, thereby improving the short-circuit resistance of the relay by optimizing the structural deficiencies of existing relays. [Means for solving the problem]

[0009] To solve this problem, the technical solution used in the present invention is as follows. According to one aspect of the present invention, the short-circuit resistant relay of the present invention comprises: a fixed base; a contact lead end, the contact lead end fixed to the fixed base and having a fixed contact thereon, the contact lead end having at least two contact lead ends; a push rod assembly; a movable spring piece, the movable contact being provided on the movable spring piece corresponding to the fixed contact, the movable spring piece being movably mounted relative to the push rod assembly along a sliding direction parallel to the push rod assembly; a first magnetic permeable sheet movably mounted on the side of the movable spring piece facing the fixed contact; and a second magnetic permeable sheet mounted on the side of the movable spring piece facing away from the fixed contact and capable of forming a magnetic circuit with the first magnetic permeable sheet. After the push rod assembly drives the movable spring piece to operate, causing the movable contact of the movable spring piece to contact the fixed contact of the contact lead end, the push rod assembly continues to operate to achieve an overstroke, during which the first magnetic permeable sheet moves toward the second magnetic permeable sheet within a predetermined stroke along a moving direction parallel to the movable spring piece.

[0010] Furthermore, the relay further includes an over-travel elastic member, and when the push rod assembly operates to achieve an over-stroke, the over-travel elastic member can apply an over-travel elastic force toward the fixed contact to the movable spring piece.

[0011] Furthermore, the device further includes a limiting structure connected to the first magnetic permeable sheet, and when the first magnetic permeable sheet approaches the second magnetic permeable sheet according to a predetermined stroke, the limiting structure restricts the first magnetic permeable sheet, thereby keeping the distance between the first magnetic permeable sheet and the second magnetic permeable sheet within a predetermined range value.

[0012] Furthermore, the push rod assembly includes a push rod and an electromagnetic assembly that drives and moves the push rod, a first through hole is opened in the movable spring piece, the push rod slides through the first through hole, and the first magnetic permeable sheet is slidably connected to the push rod.

[0013] Furthermore, the limiting structure is installed on the push rod and is located between the first magnetic permeable sheet and the movable spring piece.

[0014] Additionally, the limiting structure is a stopper block fixedly connected to the push rod.

[0015] Furthermore, the push rod includes a first sliding end and a second sliding end, the outer diameter of the first sliding end is smaller than the outer diameter of the second sliding end, the limiting structure is a stepped portion formed at the connection position between the first sliding end and the second sliding end, the first sliding end is slidably engaged with the first through hole, a second through hole is opened in the first magnetic permeable sheet, and the first sliding end is slidably engaged with the second through hole.

[0016] Furthermore, an engaging groove that engages with the stepped portion is provided around the second through hole on the first magnetic permeable sheet, and the engaging groove is located on the side of the first magnetic permeable sheet facing the movable spring piece.

[0017] Further, a stopper member is installed at the end of the push rod close to the movable spring piece, and the relay further comprises a first sliding rod, one end of the first sliding rod is fixed to the first magnetic permeable sheet, the first sliding rod slides through the stopper member, and the limiting structure is located at the end of the first sliding rod away from the first magnetic permeable sheet and can abut against the surface of the stopper member facing away from the first magnetic permeable sheet; or one end of the first sliding rod is fixed to the stopper member, the first sliding rod slides through the first magnetic permeable sheet, and the limiting structure is located at the end of the first sliding rod away from the first magnetic permeable sheet The limiting structure may be located at an end away from the first magnetic permeable sheet and abut against a surface of the first magnetic permeable sheet facing away from the stopper member, or the limiting structure may include a first limiting end and a second limiting end, the first limiting end and the second limiting end being respectively installed at opposite ends of a first sliding rod, the first sliding rod sliding through the first magnetic permeable sheet and the stopper member, the first limiting end abutting against a surface of the stopper member facing away from the first magnetic permeable sheet, and the second limiting end abutting against a surface of the first magnetic permeable sheet facing away from the stopper member.

[0018] Furthermore, guide protrusions are installed on both sides of the first and second magnetic permeable sheets on the fixed base, and the two guide protrusions form a first guide groove in which the first and second magnetic permeable sheets slide while maintaining a gap between them.

[0019] Furthermore, the push rod assembly includes a push rod and an electromagnetic assembly for driving the push rod to move, and a push plate is installed at the end of the push rod, and the push plate is connected to the movable spring piece by an over-travel elastic member.

[0020] Furthermore, the device further includes two guide plates installed on opposite sides of the movable spring piece, the two guide plates forming a second guide groove in which the movable spring piece slides, and a limiting plate installed at the end of the guide plate away from the push plate.

[0021] Furthermore, a guide plate is installed on the fixed base.

[0022] Furthermore, a guide plate is fixed to the push rod and / or the push plate, and a first magnetically permeable sheet is slidably connected to the limiting plate and / or the guide plate.

[0023] The device may further include a second sliding rod, one end of which is fixed to the first magnetic permeable sheet, the second sliding rod sliding through the limiting plate, and the limiting structure located at the end of the second sliding rod facing away from the first magnetic permeable sheet; or one end of which is fixed to the limiting plate, the second sliding rod passing through the first magnetic permeable sheet, and the limiting structure located at the end of the second sliding rod facing away from the first magnetic permeable sheet, and abutting against the surface of the first magnetic permeable sheet facing away from the limiting plate; or the limiting structure may include a third limiting end and a fourth limiting end, which are respectively located at both ends of the second sliding rod, the second sliding rod sliding through the first magnetic permeable sheet and the limiting plate, and the third limiting end abutting against the surface of the limiting plate facing away from the first magnetic permeable sheet, and the fourth limiting end abutting against the surface of the first magnetic permeable sheet facing away from the limiting plate.

[0024] Furthermore, the limiting structure includes a limiting groove disposed in the first magnetic permeable sheet, and a limiting plate is slidably connected to the limiting groove. [Effects of the Invention]

[0025] As can be seen from the above technical solutions, the embodiments of the present invention have at least the following advantages and positive effects: The push rod assembly drives the movable spring piece to move toward the fixed contact, causing the movable contact to contact the fixed contact. During the process of the push rod assembly continuing to operate and achieving an overstroke, the first magnetic permeable sheet can slide toward the second magnetic permeable sheet within a predetermined stroke, shortening the gap between the first and second magnetic permeable sheets. As a result, after the current flows from one contact drawer end, flows through the movable spring piece, and flows out from the other contact drawer end, the first and second magnetic permeable sheets complete a magnetic circuit. To form this, the current flowing through the movable spring piece magnetizes the first and second magnetic permeable sheets, causing them to generate an attractive force against each other, and the second magnetic permeable sheet then applies a contact pressure to the movable spring piece directed toward the fixed contact by the second magnetic permeable sheet.Since the distance between the first and second magnetic permeable sheets is shorter, the magnetic attractive force between them is increased, making the closure of the movable and fixed contacts more stable and reliable, and able to counteract the electromotive repulsive force generated by the relatively large current during a short circuit. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a schematic diagram of the inside of a relay in a side view according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of the inside of the relay in the first embodiment of the present invention as viewed from the front. [Figure 3] FIG. 3 is an enlarged view of part A in FIG. [Figure 4] FIG. 4 is a schematic diagram showing the connection and positional relationship between the contact lead end, the movable spring piece, the first magnetic permeable sheet, and the second magnetic permeable sheet in the relay according to the first embodiment of the present invention when the contacts are disconnected. [Figure 5] FIG. 5 is a three-dimensional schematic view of the inside of the relay according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of the relay according to the first embodiment of the present invention when the movable contact and the fixed contact are closed. [Figure 7]FIG. 7 is a schematic diagram of the relay according to the first embodiment of the present invention when the armature and the fixed core are closed. [Figure 8] FIG. 8 is a schematic diagram showing the connection relationship between the first type of limiting structure and the first magnetic permeable sheet in the second embodiment of the present invention. [Figure 9] FIG. 9 is a schematic diagram showing the connection relationship between the second type of limiting structure and the first magnetic permeable sheet in the second embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing the connection relationship between the third type of limiting structure and the first magnetic permeable sheet in the second embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram showing the connection and positional relationship between the contact lead end, the movable spring piece, the first magnetic permeable sheet, and the second magnetic permeable sheet in a relay according to a third embodiment of the present invention when the contacts are disconnected. [Figure 12] FIG. 12 is a schematic diagram of a relay according to a third embodiment of the present invention in a state where the contacts are disconnected. [Figure 13] FIG. 13 is a schematic diagram of a relay according to the third embodiment of the present invention when the movable contact and the fixed contact are closed. [Figure 14] FIG. 14 is a schematic diagram of a state in which the armature and the fixed core of the relay according to the third embodiment of the present invention are closed. [Figure 15] FIG. 15 is a schematic diagram showing the connection relationship between the first type of limiting structure and the first magnetic permeable sheet in the third embodiment of the present invention. [Figure 16] FIG. 16 is a schematic diagram showing the connection relationship between the second type of limiting structure and the first magnetic permeable sheet in the third embodiment of the present invention. [Figure 17] FIG. 17 is a schematic diagram showing the connection relationship between the third type of limiting structure and the first magnetic permeable sheet in the third embodiment of the present invention. [Figure 18] FIG. 18 is a schematic diagram showing the connection relationship between the first type of first magnetic permeable sheet and the limiting plate in Example 4 of the present invention. [Figure 19] FIG. 19 is a schematic diagram showing the connection relationship between the second type of first magnetic permeable sheet and the limiting plate in Example 4 of the present invention. [Explanation of symbols]

[0027] 1 Fixed base 101 Pedestal 102 Upper cover 103 Mounting Room 2 Contact extraction end 3 Movable spring piece 301 First through hole 4 Pushrod Assembly 401 Push rod 4011 1st sliding end 4012 2nd sliding end 4013 Stepped part 4014 Push plate 402 Electromagnetic Assembly 4021 Holder 4022 coil 4023 Fixed iron core 4024 Magnetically permeable plate 4025 Yoke 4026 Armature 5. Overtravel elastic member 6. First magnetic permeable sheet 601 Second through hole 602 Engagement groove 603 Restriction groove 7. Restrictive Structure 8. Second magnetic permeable sheet 9 Arc blow-out structure 10 Reset elastic member 11 Stopper member 12 Guide protrusion 1201 First guide groove 13 First Slide 1301 First limiting end 1302 Second limit end 14 Signboard 1401 Second guide groove 15 Restriction board 16 Second slide 1601 Third Restriction End 1602 4th Restriction End DETAILED DESCRIPTION OF THE INVENTION

[0028] For better understanding and implementation, the following clearly and completely describes the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments of the present invention.

[0029] In describing the present invention, it should be explained that the orientations or positional relationships indicated by the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," etc. are orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of the present invention, and do not indicate or imply that the indicated devices or elements necessarily have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In this specification, the terms used in the specification of the present invention are only for describing specific examples and are not intended to limit the present invention.

[0031] Example 1 1 to 7, the present invention discloses a short-circuit resistant relay, comprising a fixed base 1, a contact lead end 2, a movable spring piece 3, a push rod assembly 4, an over-travel elastic member 5, a first magnetic permeable sheet 6, a limiting structure 7 and a second magnetic permeable sheet 8, the fixed base 1 includes a base 101 and an upper cover 102, a mounting chamber 103 is installed in the base 101 and the upper cover 102, and an arc blowing structure 9 is further installed in the mounting chamber 103, the arc blowing structure 9 may refer to other prior art, and a detailed description thereof will be omitted here. The contact lead end 2 is fixed to the fixed base 1, and as shown in the figure, the contact lead end 2 is fixed to the upper cover 102, and there are at least two fixed contacts (not shown) installed in the contact lead end 2, and the fixed contacts are installed at intervals and insulated from each other, Movable contacts (not shown) are provided at both ends of the movable spring piece 3 in correspondence with the fixed contacts, and a movable contact is provided corresponding to each fixed contact. The movable spring piece 3 is movably mounted relative to the push rod assembly, and is driven by the push rod assembly 4 to approach or move away from the fixed contact point; The push rod assembly 4 drives the movable spring piece 3 to bring the movable contacts at both ends of the movable spring piece 3 into contact with the fixed contacts at the two contact drawer ends 2, so that current flows in from one contact drawer end 2, flows through the movable spring piece 3, and then flows out from the other contact drawer end 2, as shown by I in Figure 6 or Figure 7. The movable spring piece 3 is installed so as to be movable relative to the push rod assembly 4 along a sliding direction parallel to the push rod assembly 4, During the process of the push rod assembly 4 operating to realize the overtravel, the overtravel elastic member 5 can apply an overtravel elastic force to the movable spring piece 3 in the direction of the fixed contact point.

[0032] In some possible embodiments, the over-travel elastic member 5 is installed in the push rod assembly 4, the over-travel elastic member 5 is connected to the movable spring piece 3, and can apply an over-travel elastic force toward the fixed contact to the movable spring piece 3; As shown in FIG. 1, the over-travel elastic member 5 uses an over-travel spring, and in other possible embodiments, the over-travel elastic member 5 may be replaced with a further elastic piece or other member having rebound elasticity.

[0033] As a result, the push rod assembly 4 drives the movable spring piece 3 to approach the fixed contact, bringing the movable contact on the movable spring piece 3 into contact with the fixed contact and realizing contact closure, and the overtravel elastic member 5 applies an elastic force to the movable spring piece 3 directed toward the fixed contact, thereby providing additional pressure to close the contact.

[0034] The first magnetic permeable sheet 6 is movably installed in a direction parallel to the movable spring piece 3 toward the fixed contact point of the movable spring piece 3, The second magnetic permeable sheet 8 is installed on the side of the movable spring piece 3 away from the fixed contact, and the second magnetic permeable sheet 8 is installed corresponding to the first magnetic permeable sheet 6. After the push rod assembly 4 drives and operates the movable spring piece 3, causing the movable contact of the movable spring piece 3 to contact the fixed contact at the contact pull-out end 2, during the process of the push rod assembly 4 continuing to operate and realizing overtravel, the first magnetic permeable sheet 6 moves in a direction parallel to the movable spring piece 3 toward the second magnetic permeable sheet 8 within a predetermined stroke.

[0035] 2, 6 and 7, in the process of closing the contacts, the push rod assembly 4 drives the movable spring piece 3 to approach the fixed contact and bring the movable contact into contact with the fixed contact, and in the process of the push rod assembly 4 continuing to move forward to realize overtravel, the first magnetic permeable sheet 6 can slide toward the second magnetic permeable sheet 8, shortening the gap between the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8. After the current flows from one contact lead-out end 2, flows through the movable spring piece 3 and exits from the other contact lead-out end 2, the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 slide toward each other. Since the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 form a magnetic circuit, the current flowing through the movable spring piece 3 magnetizes the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8, causing the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 to generate an attractive force against each other, and furthermore, the second magnetic permeable sheet 8 applies a contact pressure to the movable spring piece 3 directed toward the fixed contact.Since the distance between the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 is shorter, the magnetic attractive force between them is increased, making the closure of the movable contact and the fixed contact more stable and reliable, and making it possible to counteract the electromotive repulsive force generated by the relatively large current during a short circuit.

[0036] As shown in FIGS. 1 and 2, a first magnetically permeable sheet 6 and a second magnetically permeable sheet 8 are installed as a pair.

[0037] In another possible embodiment, two or more pairs of the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 may be provided.

[0038] In some possible embodiments, a first magnetically permeable sheet 6 is installed on the push rod assembly 4 .

[0039] When the restricting structure 7 is connected to the first magnetic permeable sheet 6 and the first magnetic permeable sheet 6 approaches the second magnetic permeable sheet 8 according to a predetermined stroke, the restricting structure 7 restricts the first magnetic permeable sheet 8, thereby keeping the distance between the first magnetic permeable sheet (6) and the second magnetic permeable sheet 8 within a predetermined range value.

[0040] In some possible embodiments, a limiting structure 7 is installed on the push rod assembly 4 .

[0041] Furthermore, the predetermined range value of the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 is a, the overstroke movement distance of the push rod assembly 4 is H, and 0≦a <Hである。

[0042] When the gap between the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 is zero, the surfaces of the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 are in close contact with each other.

[0043] Referring to Figures 2 and 3, in some possible embodiments, the push rod assembly 4 includes a push rod 401 and an electromagnetic assembly 402 that drives and moves the push rod 401, a first through hole 301 is opened in the movable spring piece 3, the push rod 401 slides through the first through hole 301, and the first magnetic permeable sheet 6 is slidably connected to the push rod 401.

[0044] This allows the push rod 401 to provide a sliding guide for the movable spring piece 3 and the first magnetically permeable sheet 6 .

[0045] In some possible embodiments, the limiting structure 7 is installed on the push rod 401 and is located between the first magnetically permeable sheet 6 and the movable spring piece 3 .

[0046] Furthermore, the limiting structure 7 is a stopper block (not shown) fixedly connected to the push rod 401. For example, the stopper block may use a snap ring, and a locking groove may be opened on the outer wall of the push rod 401 for the snap ring to be engaged and fixed, or the stopper block may further be a screw or bolt-nut assembly, and the screw or bolt-nut assembly may be screwed and fixed to the push rod 401. Of course, the stopper block may further be fixed to the push rod 401 by adhesive or welding.

[0047] Referring to FIG. 3, in some possible embodiments, the push rod 401 includes a first sliding end 4011 and a second sliding end 4012, the outer diameter of the first sliding end 4011 is smaller than the outer diameter of the second sliding end 4012, the limiting structure 7 is a stepped portion 4013 formed at the connection position between the first sliding end 4011 and the second sliding end 4012, the first sliding end 4011 is slidably engaged with the first through hole 301, a second through hole 601 is opened in the first magnetic permeable sheet 6, and the first sliding end 4011 is slidably engaged with the second through hole 601.

[0048] Furthermore, when the cross section of the push rod 401 is circular, the diameter of the first sliding end 4011 is larger than the diameter of the second sliding end 4012 .

[0049] If the cross section of the push rod 401 is non-circular, the outer diameter of the first sliding end 4011 is the maximum dimension of the cross section of the outer diameter of the second sliding end 4012; for example, if the cross section of the push rod 401 is rectangular, the length of the diagonal of the cross section of the push rod 401 is the outer diameter of the first sliding end 4011 or the second sliding end 4012.

[0050] As a result, using the above structure, a slidable connection is realized between the movable spring piece 3, the first magnetic permeable sheet 6 and the push rod 401, and the adjustment portion abuts against the first magnetic permeable sheet 6 to limit it, thereby controlling the distance between the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 within a predetermined range.

[0051] Referring to Figure 3, in some possible embodiments, the first magnetic permeable sheet 6 has an engaging groove 602 around the second through hole 601 that engages with the stepped portion 4013, and the engaging groove 602 is located on the side of the first magnetic permeable sheet 6 facing the movable spring piece 3.

[0052] As a result, when the first magnetic permeable sheet 6 slides toward the second magnetic permeable sheet 8, the engaging groove 602 can abut against the stepped portion 4013, and the engaging groove 602 can engage with the stepped portion 4013. The installation of the engaging groove 602 can reduce the thickness of the first magnetic permeable sheet, contributing to providing a compact structure.

[0053] Referring to FIG. 4, a stopper member 11 is further provided at the end of the push rod 401 that is close to the movable spring piece 3 .

[0054] The provision of the stopper member 11 can prevent the first magnetic permeable sheet 6 and the movable spring piece 3 from coming off the end of the push rod 401 .

[0055] Referring to Figure 5, furthermore, guide protrusions 12 are installed on both sides of the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 on the fixed base 1, and the two guide protrusions 12 form guide grooves along which the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 slide while maintaining a gap between them.

[0056] Such an installation provides guidance for the movement of the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8, reducing the occurrence of situations in which the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 rotate or flip horizontally, making the magnetic attraction of both the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 stable and reliable.

[0057] Referring to FIG. 2 , the electromagnetic assembly 402 further includes a holder 4021, a coil 4022, a fixed core 4023, a magnetically permeable plate 4024, a yoke 4025, and an armature 4026, wherein the coil 4022 is fitted around the fixed core 4023, the fixed core 4023 and the yoke 4025 are all fixed to the holder 4021, and the armature 4026 is fixedly connected to the push rod 401. When electricity is applied to the coil 4022, magnetic flux is generated in the magnetically permeable plate 4024, the yoke 4025, and the fixed core 4023, and the magnetic flux forms a closed magnetic circuit, thereby tending to drive the armature 4026 to move closer to the fixed core 4023.

[0058] Referring to FIG. 2, the relay further includes a reset elastic member 10, which is installed between the fixed core 4023 and the armature 4026. The reset elastic member 10 applies a force to the armature 4026 in a direction away from the fixed core 4023, thereby assisting in the separation of the armature 4026 and the fixed core 4023, and further separating the movable contact and the fixed contact, thereby realizing resetting.

[0059] As a result, when current is passed through the coil 4022, an electromagnetic flux is generated in the fixed iron core 4023 and the yoke 4025. If the magnetic path formed by the magnetic flux tends to close, the attracting armature 4026 moves in a direction approaching the iron core, further driving and moving the push rod 401, thereby realizing the closing of the movable contact and the fixed contact in the relay.

[0060] Referring to FIG. 6 , when the movable contact and the fixed contact on the movable spring piece 3 are closed, there is still a gap between the armature 4026 and the fixed iron core 4023, and this gap is the overstroke movement distance H of the push rod assembly 4. That is, the armature 4026 moves from the time when the movable contact and the fixed contact are closed until it comes into close contact with the fixed iron core 4023, and this process is the overstroke operation process of the push rod assembly 4.

[0061] As the armature 4026 continues to approach the fixed iron core 4023, the push rod 401 moves relative to the movable spring piece 3, but the first magnetic permeable sheet 6 is slidably installed on the push rod 401, and then the limiting structure 7 limits the first magnetic permeable sheet 6, that is, until the stepped portion 4013 abuts against the first magnetic permeable sheet 6 as shown in Figure 7, the first magnetic permeable sheet 6 can slide in the direction approaching the second magnetic permeable sheet 8 due to the action of its own weight and / or the attraction of the second magnetic permeable sheet 8.

[0062] Finally, after the armature 4026 contacts the fixed iron core 4023, the push rod assembly 4 stops operating, and the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 contact or maintain a gap between them, generating a magnetic attraction force between them due to the action of the current flowing through the movable spring piece 3. This, combined with the elastic force of the over-travel elastic member 5, provides conditions for stable closure of the movable contact and the fixed contact on the movable spring piece 3, thereby better resisting the electromotive repulsive force generated when a large current flows in short-circuit mode, and meeting actual application needs.

[0063] Example 2 This embodiment discloses another relay having short circuit resistance, and the differences between this embodiment and the first embodiment are as follows: Referring to Figure 8, in this embodiment, the relay further includes a first sliding rod 13, one end of which is fixed to the first magnetic permeable sheet 6, the first sliding rod 13 slidingly passing through the stopper member 11, and the limiting structure 7 is located at the end of the first sliding rod 13 facing away from the first magnetic permeable sheet 6 and can only be abutted against the surface of the stopper member 11 facing away from the first magnetic permeable sheet 6.

[0064] This allows the first magnetic permeable sheet 6 to slide relative to the stopper member 11 by the first sliding rod 13, and the limiting structure 7 to abut against the surface of the stopper member 11 facing away from the first magnetic permeable sheet 6, thereby restricting the first magnetic permeable sheet 6.

[0065] Referring to FIG. 9, in another possible embodiment, one end of the first sliding bar 13 is fixed to the stopper member 11, the first sliding bar 13 penetrates the first magnetic permeable sheet 6, and the limiting structure 7 is located at the end of the first sliding bar 13 away from the first magnetic permeable sheet 6 and abuts against the surface of the first magnetic permeable sheet 6 facing away from the stopper member 11; This allows the first magnetic permeable sheet 6 to slide relative to the first sliding rod 13 and come into contact with the surface of the first magnetic permeable sheet 6 facing away from the stopper member 11, thereby restricting the first magnetic permeable sheet 6.

[0066] Referring to Figure 10, in a further possible embodiment, the limiting structure 7 includes a first limiting end 1301 and a second limiting end 1302, the first limiting end 1301 and the second limiting end 1302 being respectively installed at both ends of the first sliding rod 13, the first sliding rod 13 slidingly passing through the first magnetic permeable sheet 6 and the stopper member 11, and the first limiting end 1301 can abut against the surface of the stopper member 11 facing away from the first magnetic permeable sheet 6, and the second limiting end 1302 can abut against the surface of the first magnetic permeable sheet 6 facing away from the stopper member 11.

[0067] This allows both the first magnetic permeable sheet 6 and the first sliding rod 13 to slide relative to the stopper member 11, and the first limiting end 1301 can abut against the surface of the stopper member 11 facing away from the first magnetic permeable sheet 6, and the second limiting end 1302 can abut against the surface of the first magnetic permeable sheet 6 facing away from the stopper member 11, thereby restricting the first magnetic permeable sheet 6.

[0068] Example 3 Referring to FIGS. 11 to 17, this embodiment discloses another relay having short-circuit resistance. The difference between this embodiment and the first embodiment is that: In this embodiment, the push rod assembly 4 includes a push rod 401 and an electromagnetic assembly 402 that drives and moves the push rod 401. A push plate 4014 is installed at the end of the push rod 401, and the push plate 4014 is connected to the movable spring piece 3 by an over-travel elastic member 5.

[0069] Referring to Figures 11 and 15, in some possible embodiments, the device further includes two guide plates 14 installed on opposite sides of the movable spring piece 3, and the two guide plates 14 form a second guide groove (1401) along which the movable spring piece 3 slides.

[0070] By installing the guide plate 14, a second guide groove 1401 is formed in which the movable spring piece 3 slides, thereby reducing the occurrence of the movable spring piece 3 rotating or reversing horizontally, thereby making the process of the movable spring piece 3 sliding to close the contact stable and reliable.

[0071] In some possible embodiments, a guide plate 14 is mounted on the fixed base 1 .

[0072] Referring to FIG. 11, in some possible embodiments, the guide plate 14 may be fixed to the push rod 401 and / or the push plate 4014, for example, the guide plate 14 may be fixed to the push plate 4014, and in other possible embodiments, the guide plate 14 may be fixed to the push rod 401, or may be fixed to both the push rod 401 and the push plate 4014.

[0073] A limiting plate 15 is provided at the end of the guide plate 14 away from the push plate 4014, and the first magnetic permeable sheet 6 is slidably connected to the limiting plate 15 and / or the guide plate 14.

[0074] As a result, by installing the limiting plate 15, it is possible to prevent the movable contact from coming off the end of the guide plate 14 that is away from the push plate 4014, and by slidably connecting the first magnetic permeable sheet 6 to the limiting plate 15 and / or the guide plate 14, it is possible to realize that the first magnetic permeable sheet 6 can slide in the direction approaching the second magnetic permeable sheet 8 during the overtravel operation of the push rod assembly 4.

[0075] In this embodiment, the first magnetic permeable sheet 6 is slidably connected to the limiting plate 15 .

[0076] 11 to 15, in some possible embodiments, the magnetic bearing further includes a second sliding rod 16, one end of the second sliding rod 16 is fixed to the first magnetic permeable sheet 6, the second sliding rod 16 slides through the limiting plate 15, and the limiting structure 7 is located at the end of the second sliding rod 16 facing away from the first magnetic permeable sheet 6; This allows the first magnetic permeable sheet 6 to slide relative to the limiting plate 15 by the second sliding rod 16, and the limiting structure 7 to abut against the surface of the limiting plate 15 facing away from the first magnetic permeable sheet 6, thereby restricting the first magnetic permeable sheet 6.

[0077] Referring to FIG. 16, in a second possible embodiment, one end of the second sliding rod 16 is fixed to the limiting plate 15, the second sliding rod 16 penetrates the first magnetic permeable sheet 6, and the limiting structure 7 is located at the end of the second sliding rod 16 away from the first magnetic permeable sheet 6 and can abut against the surface of the first magnetic permeable sheet 6 facing away from the limiting plate 15; This allows the first magnetic permeable sheet 6 to slide relative to the second sliding rod 16 and come into contact with the surface of the first magnetic permeable sheet 6 facing away from the limiting plate 15 , thereby limiting the first magnetic permeable sheet 6 .

[0078] Referring to Figure 17, in a third possible embodiment, the limiting structure 7 includes a third limiting end 1601 and a fourth limiting end 1602, and the third limiting end 1601 and the fourth limiting end 1602 are respectively installed at both ends of the second sliding rod 16, the second sliding rod 16 slides through the first permeable sheet 6 and the limiting plate 15, and the third limiting end 1601 can abut against the surface of the limiting plate 15 facing away from the first permeable sheet 6, and the fourth limiting end 1602 can abut against the surface of the first permeable sheet 6 facing away from the limiting plate 15.

[0079] This allows both the first magnetic permeable sheet 6 and the second sliding rod 16 to slide relative to the limiting plate 15, so that the third limiting end 1601 can abut against the surface of the limiting plate 15 facing away from the first magnetic permeable sheet 6, and the fourth limiting end 1602 can abut against the surface of the first magnetic permeable sheet 6 facing away from the limiting plate 15, thereby restricting the first magnetic permeable sheet 6.

[0080] The implementation process of the present invention is similar to that of Example 1 above, 2 to 14, in the process of closing the contacts, the push rod assembly 4 drives the movable spring piece 3 to approach the fixed contact, and brings the movable contact into contact with the fixed contact, As the armature 4026 continues to approach the fixed core 4023, the push rod 401 moves relative to the movable spring piece 3 and continues to push the push plate 4014 toward the fixed contact point, driving the guide plate 14 and the limiting plate 15 to continue moving forward and compressing the over-travel elastic member 5, but the first magnetic permeable sheet 6 slides relative to the limiting plate 15, and therefore, until the limiting structure 7 restricts the first magnetic permeable sheet 6, the first magnetic permeable sheet 6 can slide in the direction approaching the second magnetic permeable sheet 8 due to the action of its own weight and / or the attraction of the second magnetic permeable sheet 8, i.e., as shown in Figure 14.

[0081] Finally, after the armature 4026 contacts the fixed iron core 4023, the push rod assembly 4 stops operating, and the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8 contact or maintain a gap between them, generating a magnetic attractive force that attracts them to each other under the action of the current in the movable spring piece 3. This, combined with the elastic force of the over-travel elastic member 5, provides conditions for stable closure of the movable contact and the fixed contact on the movable spring piece 3, thereby better resisting the electromotive repulsive force generated when a large current flows in short-circuit mode, and meeting actual application needs.

[0082] Example 4 This embodiment discloses another relay having short circuit resistance, and the difference between this embodiment and the above-mentioned embodiment 1 is as follows: Referring to FIG. 18, the limiting structure 7 simply includes a limiting groove 603 disposed in the first magnetic permeable sheet 6, and the limiting plate 15 is slidably connected to the limiting groove 603.

[0083] In a possible embodiment, the first magnetically permeable sheet 6 is of closed construction.

[0084] The limiting plate 15 abuts against the inner wall of the limiting groove 603 on the side away from the second magnetic permeable sheet 8 , thereby limiting the stroke by which the first magnetic permeable sheet 6 approaches the second magnetic permeable sheet 8 .

[0085] Referring to FIG. 19, in another possible embodiment, the first magnetically permeable sheet 6 is of semi-closed construction.

[0086] In short, the short-circuit resistant relay of the present invention shortens the distance between the first magnetic permeable sheet 6 and the second magnetic permeable sheet 8, thereby making the closure of the movable contact and the fixed contact more stable and reliable, and being able to withstand the electromotive repulsive force generated by the relatively large current during a short circuit.

[0087] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions formed by any combination of the above technical features. It should be noted that those skilled in the art may further make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A short-circuit resistant relay, A fixed base (1), a contact lead-out end (2), the contact lead-out end (2) being fixed to the fixed base (1) and having fixed contacts installed thereon, and at least two of the contact lead-out ends being installed thereon; a push rod assembly (4); a movable spring piece (3) having a movable contact installed in correspondence with the fixed contact, the movable spring piece (3) being movable relative to the push rod assembly (4) along a sliding direction parallel to the push rod assembly (4); a first magnetically permeable sheet (6) movably installed on the side of the movable spring piece (3) facing the fixed contact point; a second magnetically permeable sheet (8) that is disposed on the side of the movable spring piece (3) facing away from the fixed contact point and that can form a magnetic circuit with the first magnetically permeable sheet (6); A restriction structure (7), Two guide plates (14) installed on opposite sides of the movable spring piece (3), Equipped with The push rod assembly (4) includes a push rod (401), and a push plate (4014) is installed at the end of the push rod (401); The limiting structure (7) is connected to the first magnetic permeable sheet (6), and when the first magnetic permeable sheet (6) approaches the second magnetic permeable sheet (8) according to a predetermined stroke, the limiting structure (7) limits the first magnetic permeable sheet (6), thereby keeping the distance between the first magnetic permeable sheet (6) and the second magnetic permeable sheet (8) within a predetermined range value; A limiting plate (15) is installed at the end of the guide plate (14) away from the push plate (4014), After the push rod assembly (4) drives and operates the movable spring piece (3) to bring the movable contact of the movable spring piece (3) into contact with the fixed contact of the contact pull-out end (2), the push rod assembly (4) continues to operate to achieve an overstroke, during which the first magnetic permeable sheet (6) moves in a direction parallel to the movable spring piece (3) and approaches the second magnetic permeable sheet (8) within a predetermined stroke, The limiting structure (7) includes a limiting groove (603) installed in the first magnetic permeable sheet (6), and the limiting plate (15) is slidably connected to the limiting groove (603).

2. 2. The short-circuit-resistant relay according to claim 1, further comprising an over-travel elastic member (5), wherein the over-travel elastic member (5) can apply an over-travel elastic force toward the fixed contact to the movable spring piece (3) when the push rod assembly (4) achieves an over-stroke.

3. 2. The short-circuit-resistant relay of claim 1, wherein the push rod assembly (4) includes an electromagnetic assembly (402) that drives and moves the push rod (401), a first through hole (301) is opened in the movable spring piece (3), the push rod (401) slides through the first through hole (301), and the first magnetic permeable sheet (6) is slidably connected to the push rod (401).

4. 4. The short-circuit-resistant relay according to claim 3, wherein the limiting structure (7) is installed on the push rod (401) and is located between the first magnetic permeable sheet (6) and the movable spring piece (3).

5. 5. The short-circuit-proof relay according to claim 4, wherein the limiting structure (7) is a stopper block fixedly connected to the push rod (401).

6. The push rod (401) includes a first sliding end (4011) and a second sliding end (4012), the outer diameter of the first sliding end (4011) is smaller than the outer diameter of the second sliding end (4012), and the limiting structure (7) is a stepped portion (4013) formed at a connection position between the first sliding end (4011) and the second sliding end (4012); The first sliding end (4011) is slidably engaged with the first through hole (301), 5. The short-circuit-resistant relay according to claim 4, wherein a second through hole (601) is opened in the first magnetic permeable sheet (6), and the first sliding end (4011) is slidably engaged with the second through hole (601).

7. A short-circuit resistant relay as described in claim 6, characterized in that an engaging groove (602) that engages with the stepped portion (4013) is installed around the second through hole (601) on the first magnetic permeable sheet (6), and the engaging groove (602) is located on the side of the first magnetic permeable sheet (6) facing the movable spring piece (3).

8. A stopper member (11) is provided at the end of the push rod (401) close to the movable spring piece (3), The relay further comprises a first slide bar (13), one end of which is fixed to the first magnetic permeable sheet (6), which slides through the stopper member (11), and the limiting structure (7) is located at the end of the first slide bar (13) away from the first magnetic permeable sheet (6) and can be abutted against the surface of the stopper member (11) facing away from the first magnetic permeable sheet (6); Alternatively, one end of the first sliding rod (13) may be fixed to the stopper member (11), the first sliding rod (13) may penetrate the first magnetic permeable sheet (6), and the limiting structure (7) may be located at the end of the first sliding rod (13) away from the first magnetic permeable sheet (6) and abut against the surface of the first magnetic permeable sheet (6) facing away from the stopper member (11); Alternatively, the limiting structure (7) includes a first limiting end (1301) and a second limiting end (1302), the first limiting end (1301) and the second limiting end (1302) are respectively installed at both ends of the first sliding rod (13), the first sliding rod (13) slides through the first magnetic permeable sheet (6) and the stopper member (11), and the first limiting end (1301) can abut against the surface of the stopper member (11) facing away from the first magnetic permeable sheet (6), and the second limiting end (1302) can abut against the surface of the first magnetic permeable sheet (6) facing away from the stopper member (11).

9. 3. The short-circuit-resistant relay according to claim 2, wherein the push rod assembly (4) includes an electromagnetic assembly (402) that drives and moves the push rod (401), and the push plate (4014) is connected to the movable spring piece (3) by the over-travel elastic member (5).

10. A short-circuit resistant relay as described in Claim 9, wherein the two guide plates (14) form a second guide groove (1401) in which the movable spring piece (3) slides.

11. 11. The short-circuit-proof relay according to claim 10, characterized in that the guide plate (14) is mounted on the fixed base (1).

12. A short-circuit resistant relay as described in claim 10, characterized in that the guide plate (14) is fixed to the push rod (401) and / or the push plate (4014), and the first magnetic permeable sheet (6) is slidably connected to the limiting plate (15) and / or the guide plate (14).

13. The device further includes a second sliding rod (16), one end of which is fixed to the first magnetic permeable sheet (6), the second sliding rod (16) slidingly penetrating the limiting plate (15), and the limiting structure (7) being located at the end of the second sliding rod (16) facing away from the first magnetic permeable sheet (6) and abutting against the surface of the limiting plate (15) facing away from the first magnetic permeable sheet (6); Alternatively, one end of the second slide bar (16) may be fixed to the limiting plate (15), the second slide bar (16) may penetrate the first magnetic permeable sheet (6), and the limiting structure (7) may be located at the end of the second slide bar (16) away from the first magnetic permeable sheet (6) and abut against the surface of the first magnetic permeable sheet (6) facing away from the limiting plate (15); Alternatively, the limiting structure (7) includes a third limiting end (1601) and a fourth limiting end (1602), the third limiting end (1601) and the fourth limiting end (1602) are respectively installed at both ends of the second sliding rod (16), the second sliding rod (16) slides through the first magnetic permeable sheet (6) and the limiting plate (15), and the third limiting end (1601) can abut against the surface of the limiting plate (15) facing away from the first magnetic permeable sheet (6), and the fourth limiting end (1602) can abut against the surface of the first magnetic permeable sheet (6) facing away from the limiting plate (15).

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