relay

Abstract

The present disclosure provides a relay including a contact container (10), a pair of fixed contact leads (20), a first magnetic conductor (40), a push rod assembly (50), and a movable contact assembly (53). The first magnetic conductor (40) includes a connecting portion (410) and a magnetically conductive portion (420). The push rod assembly (50) includes a rod portion (51) and a second magnetic conductor (60); the second magnetic conductor (60) and the magnetically conductive portion (420) are offset along the axial direction of the rod portion (51) and correspond to the connecting portion (4110); the movable contact assembly (53) is movable between a first position and a second position along the axial direction of the rod portion (51) relative to a support seat (52), and includes a movable contact piece (54) and a third magnetic conductor (55); the distance between the third magnetic conductor (55) and the connecting portion (410) is greater than the distance between the third magnetic conductor (55) and the magnetically conductive portion (420).

Description

[Technical Field]

[0001] This disclosure relates to relays.

[0002] This publication claims priority from Chinese patent application No. 202211248733.8, entitled "RELAY," filed on October 12, 2022, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] A relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually applied in automatic control circuits. A relay is actually an "automatic switch" that controls large currents with small currents. Therefore, it plays roles such as automatic adjustment, safety protection, and circuit transformation within the circuit.

[0004] High-voltage DC relays are a type of relay. To address the problem of contact isolation due to the electromotive repulsive force generated by short-circuit current, related technologies typically use a short-circuit-resistant ring electromagnetic structure. Depending on the installation location of the upper yoke, these structures can be further divided into a tracking structure and a fixed structure. Specifically, a tracking structure refers to an upper yoke mounted on the movable assembly of the relay, while a fixed structure refers to an upper yoke mounted in a fixed position other than the movable assembly. However, while the fixed structure significantly enhances short-circuit resistance, it also reduces disconnection capability due to a negative correlation between short-circuit resistance and disconnection capability. On the other hand, a tracking structure is affected by the retaining force of the movable core. Therefore, when a short-circuit current is large, the core will separate and the contacts will be disconnected. Increasing the retaining force of the movable core requires a larger coil, which contradicts the goal of reducing volume and weight. Summary of the Invention

[0005] The disclosed embodiments provide a relay that has both short-circuit resistance and limit disconnection capability.

[0006] According to one aspect of the present disclosure, a relay according to an embodiment of the present disclosure includes a contact container, a pair of fixed contact leads, a first magnetic conductor, a push rod assembly, a movable contact assembly, and an elastic body; the contact vessel has a contact chamber; the pair of fixed contact lead ends are connected to the contact container, and at least a portion of each of the fixed contact lead ends is located within the contact chamber; the first magnetic conductor is provided in the contact chamber, the first magnetic conductor includes a connecting portion and a magnetic conductive portion connected to the connecting portion, the first magnetic conductor is fixed to the contact container via the connecting portion, the push rod assembly includes a rod portion and a second magnetic conductive body, the rod portion is movable along an axial direction of the rod portion relative to the contact container, the second magnetic conductive body is provided at one end of the rod portion, the second magnetic conductive body is offset from the magnetic conductive portion along the axial direction of the rod portion, and corresponds to the connection portion; The movable contact assembly is movable along the axial direction of the rod portion relative to the push rod assembly between a first position approaching the fixed contact pull-out end and a second position away from the fixed contact pull-out end, the movable contact assembly including a movable contact piece and a third magnetic conductor, the first magnetic conductor and the second magnetic conductor being provided on the side of the movable contact piece facing the fixed contact pull-out end, the third magnetic conductor being fixedly connected along the axial direction of the rod portion to the side of the movable contact piece facing away from the first magnetic conductor and the second magnetic conductor, the third magnetic conductor and the first magnetic conductor being used to form a first magnetic conductive circuit, the third magnetic conductor and the second magnetic conductor being used to form a second magnetic conductive circuit, and the distance between the third magnetic conductor and the connection portion being greater than the distance between the third magnetic conductor and the magnetic conductive portion.

[0007] According to one embodiment of the present disclosure, an elastic body is used to connect the movable contact assembly and the push rod assembly and to apply an elastic force to the movable contact assembly to move it toward the first position.

[0008] According to one embodiment of the present disclosure, the magnetic conductive portion and the connection portion are integrally formed, and the magnetic conductive portion extends from the connection portion toward the movable contact piece.

[0009] According to one embodiment of the present disclosure, the first magnetic conductor includes two magnetic conductive parts arranged opposite each other, and the two magnetic conductive parts are respectively connected to two opposing side edges of the connecting part along the length direction of the movable contact piece, forming the first magnetic conductor into an inverted U shape.

[0010] According to one embodiment of the present disclosure, when the movable contact assembly is in the first position, the magnetic distance between the magnetic conductive portion and the third magnetic conductive body is greater than the magnetic distance between the second magnetic conductive body and the third magnetic conductive body.

[0011] According to one embodiment of the present disclosure, when the movable contact assembly is in the first position, the second magnetic conductive body is in direct contact with the third magnetic conductive body.

[0012] According to one embodiment of the present disclosure, the push rod assembly further includes a support seat, the support seat being fixedly provided at one axial end of the rod portion and extending at least partially into the contact chamber, the second magnetic conductor being fixedly connected to the support seat, and the elastic body being provided between the movable contact assembly and the support seat.

[0013] According to one embodiment of the present disclosure, the support seat includes a base and a bracket; the base is connected to one end of the rod portion, and the elastic body is provided between the base and the movable contact assembly; The bracket is connected to the base, the second magnetic conductor is connected to the inner wall surface of the bracket, and the movable contact piece and the third magnetic conductor are movably arranged in the space surrounded by the base and the bracket.

[0014] According to one embodiment of the present disclosure, the bracket includes a top portion and two side portions; the second magnetic conductor is connected to an inner wall surface of the upper portion, The two side portions are connected to opposite sides of the upper portion and extend from the upper portion toward the base, and one end of each of the two side portions remote from the upper portion is connected to the base, and the two side portions, the upper portion, and the base together form a space for the movable contact assembly to move.

[0015] According to one embodiment of the present disclosure, the contact container further has a pair of first through holes and a pair of second through holes, the first through holes and the second through holes are respectively connected to the contact chamber, and the pair of fixed contact lead-out ends are inserted into the pair of first through holes in a one-to-one correspondence; The relay further includes a connecting member, which is inserted into the second through-hole and has a first end and a second end, the first end being connected to the contact container and the second end being connected to the connecting portion.

[0016] According to one embodiment of the present disclosure, the contact container includes a yoke plate and an insulating cover, the insulating cover includes an upper wall and a side wall, one end of the side wall is connected to a periphery of the upper wall, and the other end of the side wall is connected to the yoke plate; Here, the first through hole and the second through hole are opened in the upper wall, and the first end of the connecting member is connected to the outer wall surface of the upper wall.

[0017] According to one embodiment of the present disclosure, the insulating cover includes a ceramic cover and a flange member, the ceramic cover includes the top wall and the side wall, and the other end of the side wall is connected to the yoke plate via the flange member, a first metallized layer is provided on an outer wall surface of the upper wall at a periphery located at the first through hole, and a second metallized layer is provided on an outer wall surface of the upper wall at a periphery located at the second through hole; The fixed contact lead end is welded to the top wall through the first metallization layer, and the first end of the connecting member is welded to the top wall through the second metallization layer.

[0018] According to one embodiment of the present disclosure, the top wall and the side wall are integrally formed, or the top wall and the side wall are separate structures and are connected by welding.

[0019] According to one embodiment of the present disclosure, the connection portion and the inner wall surface of the upper wall are spaced apart.

[0020] According to one embodiment of the present disclosure, the contact container includes a yoke plate and an insulating cover connected to the yoke plate; The relay further includes a fixed frame, the fixed frame being disposed within the contact chamber and fixedly connected to the yoke plate, and the connection portion being fixedly connected to the fixed frame.

[0021] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0022] In the relay according to the disclosed embodiment, the first magnetic conductor is fixed to the contact container, and a fixed short-circuit resistant structure is formed between the magnetic conductive part and the third magnetic conductor; a followable short-circuit resistant structure is formed between the second magnetic conductor and the third magnetic conductor of the push rod assembly; the magnetic conductive part of the first magnetic conductor is offset from the second magnetic conductor along the axial direction of the rod part; and the connection part of the first magnetic conductor and the second magnetic conductor correspond to each other along the axial direction of the rod part. The relay according to the disclosed embodiment satisfies the requirements for short-circuit resistance and limit disconnection, while the first magnetic conductor does not occupy excessive space perpendicular to the axial direction of the rod part, which is advantageous for reducing the volume of the relay. [Brief explanation of the drawings]

[0023] These and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings.

[0024] [Figure 1] 1 is a schematic three-dimensional view of a relay according to the present disclosure. [Figure 2] FIG. 2 is a schematic view showing the ceramic cover and flange member removed from FIG. 1. [Figure 3] FIG. 2 is a schematic overhead view of FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 2 is an exploded schematic view of FIG. 1. [Figure 6] 4 shows a cross-sectional view taken along line BB in FIG. 3, where the ceramic cover, flange member and connecting member are omitted and overtravel is completed. [Figure 7] 4 shows a cross-sectional view taken along line CC in FIG. 3, where the ceramic cover, flange member and connecting member are omitted and overtravel is completed. [Figure 8] 4 shows a cross-sectional view taken along line AA of FIG. 3, where the ceramic cover, flange member and connecting member are omitted and overtravel is complete. [Figure 9] 4 shows a cross-sectional view taken along line BB in FIG. 3, in which the ceramic cover, flange member and connecting member are omitted, and the movable contact piece and the fixed contact lead-out end have just come into contact or have just separated. [Figure 10] 4 shows a cross-sectional view taken along line CC in FIG. 3, in which the ceramic cover, flange member and connecting member are omitted, and the movable contact piece and the fixed contact lead-out end have just come into contact or have just separated. [Figure 11] 4 shows a cross-sectional view taken along line AA in FIG. 3, in which the ceramic cover, flange member and connecting member are omitted, and the movable contact piece and the fixed contact lead-out end have just come into contact or have just separated. [Figure 12] 1 is an exploded schematic view of a relay according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments may be embodied in various forms and should not be understood to be limited to the embodiments discussed herein. Relative terms such as "above" and "below" are used herein to describe the relative relationship between one assembly and another assembly shown in the drawings; however, these terms are used merely for convenience and are based on, for example, the exemplary orientation shown in the drawings. It is understood that if the device shown in the drawings is turned upside down, the assembly described as "above" would become the "below" assembly. Other relative terms, such as "top" and "bottom," have similar meanings. When a structure is located "above" another structure, this can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

[0026] The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements / components / etc., the terms "comprising" and "having" are used to indicate an open inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc., and terms such as "first," "second," etc. are used as indicative terms only and do not limit the number of their references.

[0027] As shown in Fig. 12, Fig. 12 is an exploded schematic view of a relay according to an embodiment of the present disclosure. The relay includes a housing 1100, an electromagnet unit 1200, an arc-extinguishing unit 1300, and a seal unit 1400. The seal unit 1400 is disposed within the housing 1100, and an upper portion of the fixed contact lead-out end 20 of the seal unit 1400 is exposed to the outer surface of the housing 1100 through an exposure hole 1130 in the housing 1100. The electromagnet unit 1200 and the arc-extinguishing unit 1300 are disposed within the housing 1100.

[0028] As an example, the housing 1100 includes a first case 1110 and a second case 1120, which are engaged with each other to form a chamber for accommodating the electromagnet unit 1200, the arc-extinguishing unit 1300, and the seal unit 1400.

[0029] The arc-extinguishing unit 1300 is used to extinguish an arc that occurs between the fixed contact lead-out end 20 of the seal unit 1400 and the movable contact piece 54 .

[0030] For example, the arc-extinguishing unit 1300 includes two arc-extinguishing magnets 1310. The arc-extinguishing magnets 1310 may be permanent magnets, and each arc-extinguishing magnet 1310 may be roughly rectangular shaped. The two arc-extinguishing magnets 1310 are respectively provided on both sides of the seal unit 1400 and are arranged opposite each other along the longitudinal direction D2 of the movable contact piece 54.

[0031] By providing two arc-extinguishing magnets 1310 facing each other, a magnetic field can be formed around the fixed contact pull-out end 20 and the movable contact piece 54. Therefore, the arcs generated between the fixed contact pull-out end 20 and the movable contact piece 54 are all stretched away from each other by the action of the magnetic field, thereby realizing arc extinction.

[0032] The arc-extinguishing unit 1300 further includes two yoke clamps 1320, which are located corresponding to the positions of the two arc-extinguishing magnets 1310. The two yoke clamps 1320 surround the seal unit 1400 and the two arc-extinguishing magnets 1310. The design in which the yoke clamps 1320 surround the arc-extinguishing magnets 1310 prevents the magnetic field generated by the arc-extinguishing magnets 1310 from diffusing outward and affecting the arc-extinguishing effect. The yoke clamps 1320 are made of a soft magnetic material, which may include, but is not limited to, iron, cobalt, nickel, and alloys thereof.

[0033] As shown in Figures 1 to 5, Figure 1 is a three-dimensional schematic diagram of a relay according to a first embodiment of the present disclosure. Figure 2 is a schematic diagram in which a ceramic cover 11 and a flange member 12 are removed from Figure 1. Figure 3 is a schematic overhead view of Figure 1. Figure 4 is a cross-sectional view taken along line AA in Figure 3. Figure 5 is an exploded schematic view of Figure 1.

[0034] The seal unit 1400 according to the disclosed embodiment includes a contact container 10, a pair of fixed contact pull-out ends 20, a first magnetic conductive body 40, a push rod assembly 50, a movable contact assembly 53, and an elastic body 56.

[0035] The terms "comprises" and "having" and any variations thereof in the embodiments of the present disclosure are understood to include non-exclusive inclusions. For example, a process, method, system, product, or equipment that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units that are not listed, or may optionally further include other steps or assemblies inherent in the process, method, product, or equipment.

[0036] The contact vessel 10 has a contact chamber 101 therein. The contact vessel 10 may include an insulating cover 11a and a yoke plate 13. The insulating cover 11a covers one surface of the yoke plate 13, and the insulating cover 11a and the yoke plate 13 together form the contact chamber 101.

[0037] The insulating cover 11a includes a ceramic cover 11 and a flange member 12. The ceramic cover 11 is connected to a yoke plate 13 via the flange member 12. The flange member 12 may be a ring-shaped metal part made of an iron-nickel alloy or the like, and one end of the flange member 12 is connected to the edge of the opening of the ceramic cover 11 by, for example, laser welding, brazing, resistance welding, or adhesive bonding. The other end of the flange member 12 is connected to the yoke plate 13, and may also be connected by laser welding, brazing, resistance welding, or adhesive bonding. By providing the flange member 12 between the ceramic cover 11 and the yoke plate 13, the connection between the ceramic cover 11 and the yoke plate 13 can be facilitated.

[0038] The ceramic cover 11 includes an upper wall 111 and a side wall 112, one end of the side wall 112 being connected to surround the periphery of the upper wall 111, and the other end of the side wall 112 being connected to the yoke plate 13 via a flange member 12. In this embodiment, the other end of the side wall 112 is connected to the yoke plate 13 via the flange member 12.

[0039] The contact container 10 further has a pair of first and second through holes 102 and 103, which are respectively connected to the contact chamber 101. The first through hole 102 is for the fixed contact lead end 20 to be inserted therein, and the second through hole 103 is for the connecting member 30 to be inserted therein.

[0040] As an example, the first through hole 102 and the second through hole 103 are both opened in the upper wall 111 of the ceramic cover 11. The second through hole 103 may be provided between two first through holes 102, i.e., the connecting member 30 is provided between a pair of fixed contact lead-out ends 20.

[0041] The number of the second through holes 103 may be two, and two connecting members 30 are inserted therein, but is not limited to this.

[0042] A pair of fixed contact lead-out ends 20 are connected to the contact container 10, and at least a portion of each fixed contact lead-out end 20 is located within the contact chamber 101. One of the pair of fixed contact lead-out ends 20 serves as a current input terminal, and the other serves as a current output terminal.

[0043] The pair of fixed contact lead-out ends 20 are inserted into the pair of first through-holes 102 in a one-to-one correspondence, and are connected to the upper wall 111 of the ceramic cover 11 by, for example, welding.

[0044] The bottom of the fixed contact lead-out end 20 serves as a fixed contact, which may be provided integrally with or separately from the bottom of the fixed contact lead-out end 20 .

[0045] The first magnetic conductor 40 is provided in the contact chamber 101 and is fixedly provided relative to the contact vessel 10. The first magnetic conductor 40 includes a connecting portion 410 and a magnetically conductive portion 420 connected to the connecting portion 410. The first magnetic conductor 40 is fixedly provided relative to the contact vessel 10 by the connecting portion 410, and the magnetically conductive portion 420 is used to form a magnetically conductive circuit together with the third magnetic conductor 55.

[0046] The push rod assembly 50 is connected to the contact vessel 10 so as to be movable along the movement direction D1. The push rod assembly 50 includes a rod portion 51, a support seat 52, and a second magnetic conductor 60. The rod portion 51 is movable along the axial direction of the rod portion 51 (i.e., along the movement direction D1) relative to the contact vessel 10, the support seat 52 is fixedly provided at one end of the rod portion 51 in the axial direction, and at least a portion of the support seat 52 is inserted into the contact chamber 101, and the second magnetic conductor 60 is fixedly connected to the support seat 52. The second magnetic conductor 60 and the magnetic conductive portion 420 are offset along the axial direction of the rod portion 51 and correspond to the connection portion 410.

[0047] Note that the second magnetic conductor 60 and the magnetic conductive portion 420 being offset along the axial direction of the rod portion 51 can be understood as meaning that the orthogonal projection of the second magnetic conductor 60 onto the movable contact piece 54 and the orthogonal projection of the magnetic conductive portion 420 onto the movable contact piece 54 do not overlap along the axial direction of the rod portion 51. The correspondence between the second magnetic conductor 60 and the connection portion 410 can be understood as meaning that the orthogonal projection of the second magnetic conductor 60 onto the movable contact piece 54 and the orthogonal projection of the magnetic conductive portion 420 onto the movable contact piece 54 at least partially overlap along the axial direction of the rod portion 51.

[0048] As an example, the second magnetic conductor 60 and the support seat 52 may be fixed together by caulking, but the present invention is not limited to this.

[0049] The yoke plate 13 has a third through hole 131, which penetrates two opposing side edges of the yoke plate 13 along the thickness direction of the yoke plate 13, and the third through hole 131 communicates with the contact chamber 101 of the contact vessel 10. The rod portion 51 is inserted into the third through hole 131 so as to be movable along the axial direction.

[0050] Of course, in other embodiments, the push rod assembly 50 may have other structures known in the art, which will not be listed here.

[0051] The movable contact assembly 53 is movable relative to the push rod assembly 50 along the axial direction of the rod portion 51 between a first position approaching the fixed contact pull-out end 20 and a second position away from the fixed contact pull-out end 20. The movable contact assembly 53 includes a movable contact piece 54 and a third magnetic conductor 55, with the first magnetic conductor 40 and the second magnetic conductor 60 located on the side of the movable contact piece 54 facing the fixed contact pull-out end 20, and the third magnetic conductor 55 fixedly connected to the side of the movable contact piece 54 facing away from the first magnetic conductor 40 and the second magnetic conductor 60 along the axial direction of the rod portion 51. That is, along the thickness direction of the movable contact piece 54 (i.e., along the movement direction D1), the first magnetic conductor 40 and the second magnetic conductor 60 are located on one side of the movable contact piece 54, and the third magnetic conductor 55 is located on the other side of the movable contact piece 54. The distance between the third magnetic conductive body 55 and the connection part 410 is greater than the distance between the third magnetic conductive body 55 and the magnetic conductive part 420 .

[0052] In addition, the "first position" and "second position" in the movable contact assembly 53 being movable between a first position and a second position along the axial direction of the rod portion 51 relative to the push rod assembly 50 refer to the relative positions of the movable contact assembly 53 and the push rod assembly 50.

[0053] Specifically, after the electromagnet unit 1200 is energized, it can drive the rod portion 51, the support seat 52, and the movable contact assembly 53 to move together in a direction toward the fixed contact pull-out end 20. After the movable contact assembly 53 contacts the fixed contact pull-out end 20, the movable contact assembly 53 is stopped by the fixed contact pull-out end 20, and the rod portion 51 and the support seat 52 continue to move upward until the over-travel process is completed. During the over-travel, relative movement occurs between the movable contact assembly 53 and the push rod assembly 50.

[0054] During over-travel, assuming that the movable contact assembly 53 is fixed and unmoving, the push rod assembly 50 moves upward relative to the movable contact assembly 53. During over-travel, assuming that the push rod assembly 50 is fixed and unmoving, the movable contact assembly 53 moves downward relative to the push rod assembly 50.

[0055] Then, when the movable contact assembly 53 and the fixed contact pull-out end 20 separate, or when the movable contact assembly 53 has just come into contact with the fixed contact pull-out end 20, the movable contact assembly 53 is located at a first position relative to the push rod assembly 50, i.e., the movable contact assembly 53 approaches the fixed contact pull-out end 20 relative to the push rod assembly 50. During over-travel, the movable contact assembly 53 moves downward relative to the push rod assembly 50, i.e., the movable contact assembly 53 moves in a direction away from the fixed contact pull-out end 20 relative to the push rod assembly 50, until the movable contact assembly 53 moves to a second position relative to the push rod assembly 50. When the movable contact assembly 53 moves to the second position relative to the push rod assembly 50, the over-travel is completed. At this time, the compression amount of the elastic body 56 reaches its maximum value.

[0056] From this, it can be seen that when the movable contact assembly 53 is located at a first position relative to the push rod assembly 50, the movable contact assembly 53 and the fixed contact lead end 20 are separated or have just come into contact with each other. When the movable contact assembly 53 is located at a second position relative to the push rod assembly 50, the overtravel is completed.

[0057] As an example, the third magnetic conductor 55 and the movable contact piece 54 may be fixed by caulking, but the present invention is not limited to this.

[0058] It will be appreciated that the first magnetic conductor 40, the second magnetic conductor 60 and the third magnetic conductor 55 can all be made using materials such as iron, cobalt, nickel and alloys thereof.

[0059] In one embodiment, the second magnetic conductive body 60 may be linearly shaped, and the first magnetic conductive body 40 and the third magnetic conductive body 55 may be U-shaped, but are not limited thereto.

[0060] It will be understood that the first magnetic conductor 40, the second magnetic conductor 60 and the third magnetic conductor 55 can each be provided so as to include a plurality of overlapping magnetic conductive sheets as required.

[0061] Both ends of the movable contact piece 54 are used to contact the bottoms of the pair of fixed contact pull-out ends 20 to achieve contact closure. Both ends of the movable contact piece 54 along the length direction D2 can be movable contacts. The movable contacts at both ends of the movable contact piece 54 may protrude from other parts of the movable contact piece 54 or may be flush with other parts.

[0062] It will be understood that the movable contacts can be provided integrally or separately at both ends of the movable contact piece 54 along the length direction D2.

[0063] The elastic body 56 is provided between the movable contact assembly 53 and the support seat 52 and is used to apply an elastic force to the movable contact assembly 53 to move it to the first position.

[0064] As an example, the elastic body 56 may be, but is not limited to, a spring.

[0065] In one embodiment, one end of the elastic body 56 abuts against the support seat 52 , and the other end abuts against the third magnetic conductor 55 of the movable contact assembly 53 .

[0066] Of course, in other embodiments, a through hole may be formed in the third magnetic conductor 55, and the elastic body 56 may be brought into contact with the movable contact piece 54 through the through hole.

[0067] The support seat 52 includes a base 521 and a bracket 522. The base 521 is connected to one axial end of the rod portion 51, and the bracket 522 is connected to the base 521. The second magnetic conductor 60 is connected to the inner wall surface of the bracket 522, the movable contact piece 54 and the third magnetic conductor 55 are movably provided between the base 521 and the bracket 522, and one end of the elastic body 56 abuts against the base 521 and the other end abuts against the third magnetic conductor 55.

[0068] In one embodiment, the bracket 522 may be inverted U-shaped and may be engaged with the base 521. The base 521 and the bracket 522 surround each other to form a chamber, which is used to house the movable contact assembly 53 and the elastomer 56.

[0069] The bracket 522 may include an upper portion 523 and two side portions 524. The two side portions 524 are respectively connected to either side of the upper portion 523 and extend from the upper portion 523 toward the base 521, forming the bracket 522 in an inverted U shape. One end of each of the two side portions 524 away from the upper portion 523 is respectively connected to the base 521. A space is formed between the two side portions 524 in which the movable contact piece 54 and the third magnetic conductor 55 can be inserted and moved.

[0070] The second magnetic conductor 60 is connected to the inner wall surface of the upper part 523. When the movable contact piece 54 is not in contact with the fixed contact pull-out end 20, or when the movable contact piece 54 has just come into contact with the fixed contact pull-out end 20, the movable contact piece 54 is brought into contact with the second magnetic conductor 60 by the elastic force of the elastic body 56. During overtravel, the fixed contact pull-out end 20 stops the movable contact assembly 53 (the movable contact piece 54 and the third magnetic conductor 55) and holds the movable contact assembly 53 immovable, while the rod part 51 moves the support seat 52 and continues to move upward together with the second magnetic conductor 60, at which time the movable contact assembly 53 and the base 521 push out the elastic body 56 together.

[0071] It can be understood that in other embodiments, the second magnetic conductor 60 may be fixedly connected to one end of the rod portion 51 instead of being fixedly connected to the bracket 522 of the support seat 52. Specifically, a through hole is provided in the movable contact assembly 53, the rod portion 51 is inserted into the through hole of the movable contact assembly 53, and the second magnetic conductor 60 is provided at one end of the rod portion 51.

[0072] The seal unit 1400 further includes a metal cover 1410, which is connected to the side of the yoke plate 13 facing away from the insulating cover 11a, and which covers the third through-hole 131 on the yoke plate 13. The metal cover 1410 and the yoke plate 13 are enclosed as a chamber for accommodating the fixed core and the movable core 1240 of the electromagnet unit 1200, which will be described in detail below.

[0073] As shown in Figures 4 and 22, the electromagnet unit 1200 includes a coil bobbin 1210, a coil 1220, a fixed iron core (not shown), a movable iron core 1240, and a reset member 1250. The coil bobbin 1210 is hollow and cylindrical, and is made of an insulating material. A metal cover 1410 is inserted into the coil bobbin 1210. The coil 1220 surrounds the coil bobbin 1210. The fixed iron core is fixedly provided within the metal cover 1410, and a portion of the fixed iron core is inserted into the third through-hole 131. The fixed iron core has a through-hole that is provided at a position corresponding to the third through-hole 131 and is for inserting the rod portion 51. The movable iron core 1240 is movably provided within the metal cover 1410 and is provided opposite the fixed iron core, and the movable iron core 1240 is connected to the rod portion 51. When the coil 1220 is energized, the movable iron core 1240 is attracted to the fixed iron core. The movable iron core 1240 and the rod portion 51 can be connected by screwing, caulking, welding, or other methods.

[0074] The reset member 1250 is located inside the metal cover 1410, and is provided between the fixed iron core and the movable iron core 1240. The reset member 1250 is used to reset the movable iron core 1240 when the power supply to the coil 1220 is turned off. The reset member 1250 may be a spring, and may be fitted onto the outside of the rod portion 51.

[0075] As shown in Figures 6 to 8, Figure 6 shows a cross-sectional view taken along line BB in Figure 3, where the ceramic cover, flange member, and connecting member are omitted and over-travel is complete. Figure 7 shows a cross-sectional view taken along line CC in Figure 3, where the ceramic cover, flange member, and connecting member are omitted and over-travel is complete. Figure 8 shows a cross-sectional view taken along line AA in Figure 3, where the ceramic cover, flange member, and connecting member are omitted and over-travel is complete.

[0076] 6 to 8 show a state where overtravel is complete, in which the movable contact assembly 53 is considered to be in the second position relative to the push rod assembly 50.

[0077] 6 and 7 , a first magnetic conductive circuit is formed between the first magnetic conductor 40 and the third magnetic conductor 55, and thus a magnetic attractive force is generated between the first magnetic conductor 40 and the third magnetic conductor 55. A second magnetic conductive circuit is formed between the second magnetic conductor 60 and the third magnetic conductor 55, and thus a magnetic attractive force is generated between the second magnetic conductor 60 and the third magnetic conductor 55. Because the first magnetic conductor 40 is fixed relative to the contact container 10, when a short-circuit current flows, a fixed short-circuit resistant structure is formed between the first magnetic conductor 40 and the third magnetic conductor 55, and the holding force of the fixed short-circuit resistant structure is provided by the contact container 10. Because the second magnetic conductor 60 is fixedly connected to the support seat 52 of the push rod assembly 50, when a short-circuit current flows, a compliant short-circuit resistant structure is formed between the second magnetic conductor 60 and the third magnetic conductor 55, and the holding force of the compliant short-circuit resistant structure is provided by the relay coil 1220. Under the premise that the driving of the coil 1220 is constant, the double short-circuit resistant structure according to the disclosed embodiment effectively improves the upper limit of the short-circuit withstand current capacity.

[0078] As shown in Figure 8, the second magnetic conductor 60 and the magnetic conductive part 420 are offset along the axial direction of the rod part 51, and the two magnetic conductive circuits, namely the magnetic conductive circuit formed between the magnetic conductive part 420 and the third magnetic conductor 55 and the magnetic conductive circuit formed between the second magnetic conductor 60 and the third magnetic conductor 55, do not affect each other. As a result, the magnetic attractive force of the magnetic conductive part 420 and the magnetic attractive force of the second magnetic conductor 60 do not affect each other, ensuring short-circuit resistance.

[0079] Furthermore, the distance between the third magnetic conductor 55 and the connection portion 410 of the first magnetic conductor 40 is greater than the distance between the third magnetic conductor 55 and the magnetic conductive portion 420 of the first magnetic conductor 40. It can be seen that the magnetic flux mainly flows in the magnetic circuit with the short magnetic distance. Therefore, from Figures 6 and 7, it can be seen that when a short-circuit current flows through the movable contact piece 54, most of the magnetic flux flows between the third magnetic conductor 55 and the magnetic conductive portion 420 and between the third magnetic conductor 55 and the second magnetic conductor 60, and only a small amount of magnetic flux exists between the third magnetic conductor 55 and the connection portion 410. Therefore, the second magnetic conductor 60 and the connection portion 410 are arranged correspondingly along the axial direction of the rod portion 51 (i.e., the orthogonal projections of the second magnetic conductor 60 and the connection portion 410 on the movable contact piece 54 have overlapping portions), but since the majority of the magnetic flux flows between the magnetic conductive portion 420 and the second magnetic conductor 60 and very little magnetic flux flows through the connection portion 410, the magnetic attraction force between the connection portion 410 and the second magnetic conductor 60 only slightly weakens the magnetic attraction force generated between the entire first magnetic conductor 40 and the third magnetic conductor 55, and does not affect the short-circuit resistance capability.

[0080] In addition, along the axial direction of the rod portion 51, the connection portion 410 of the first magnetic conductor 40 corresponds to the second magnetic conductor 60, and the magnetic conductive portion 420 of the first magnetic conductor 40 and the second magnetic conductor 60 are offset, so that the first magnetic conductor 40 does not occupy excessive space perpendicular to the axial direction of the rod portion 51, which is advantageous for reducing the volume of the relay.

[0081] As shown in Figures 9 to 11, Figure 9 shows a cross-sectional view taken along line BB in Figure 3, where the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece and the fixed contact lead-out end have just come into contact or have just separated. Figure 10 shows a cross-sectional view taken along line CC in Figure 3, where the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece and the fixed contact lead-out end have just come into contact or have just separated. Figure 11 shows a cross-sectional view taken along line AA in Figure 3, where the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece and the fixed contact lead-out end have just come into contact or have just separated.

[0082] 9 to 11 show a state in which the movable contact piece 54 and the fixed contact lead-out end 20 have just come into contact with or just separated from each other. In this state, the movable contact assembly 53 is considered to be in the first position relative to the push rod assembly 50.

[0083] For ease of explanation, the relay disclosed herein has the effect of improving the short-circuit resistance capability and also meeting the requirement of breaking overload current. Figures 9 to 11 show an example in which the movable contact piece 54 and the fixed contact lead-out end 20 have just been separated.

[0084] When the relay coil 1220 is powered off, the relay's movable core 1240 moves the push rod assembly 50 downward relative to the fixed contact end 20, which corresponds to the movable contact assembly 53 moving from the second position to the first position relative to the push rod assembly 50, i.e., switching from FIG. 7 to FIG. 10. As the movable contact assembly 53 moves from the second position to the first position, the magnetic distance between the second magnetic conductor 60 and the third magnetic conductor 55 gradually decreases. When the movable contact assembly 53 moves to the first position, the second magnetic conductor 60 comes into contact with the movable contact assembly 53, and at this time, the magnetic distance between the second magnetic conductor 60 and the third magnetic conductor 55 becomes smaller than the magnetic distance between the magnetic conductive portion 420 and the third magnetic conductor 55.

[0085] It can be seen that most of the magnetic flux flows in magnetic circuits with a short magnetic distance, that is, most of the magnetic flux flows in the magnetic circuit formed by the second magnetic conductor 60 and the third magnetic conductor 55. For example, as shown in Fig. 10, one magnetic flux line is formed between the magnetic conductive part 420 of the first magnetic conductor 40 and the third magnetic conductor 55. As shown in Fig. 9, three magnetic flux lines are formed between the second magnetic conductor 60 and the third magnetic conductor 55.

[0086] At this time, the magnetic attraction force between the second magnetic conductor 60 and the third magnetic conductor 55 is relatively strong, while the magnetic attraction force between the magnetic conductive part 420 and the third magnetic conductor 55 is relatively weak. Furthermore, since the second magnetic conductor 60 is in contact with the movable contact assembly 53, the magnetic attraction force between the second magnetic conductor 60 and the third magnetic conductor 55 becomes a variable internal force and does not affect the separation of the movable contact piece 54. Therefore, the movable contact piece 54 can achieve separation by simply overcoming the small magnetic attraction force between the magnetic conductor 420 and the third magnetic conductor 55. Furthermore, the second magnetic conductor 60 is provided in correspondence with the connecting portion 410 along the axial direction of the rod portion 51 (i.e., the second magnetic conductor 60 and the connecting portion 410 have an overlapping portion in the orthogonal projection of the movable contact piece 54), but most of the magnetic flux flows through the magnetically conductive portion 420 and the second magnetic conductor 60, and very little magnetic flux flows through the connecting portion 410. Therefore, the connecting portion 410 and the second magnetic conductor 60 only slightly weaken the magnetic attractive force generated between the entire first magnetic conductor 40 and the third magnetic conductor 55, which is advantageous for separation. In addition, because the magnetic flux lines of the connecting portion 410 and the second magnetic conductor 60 are oriented in the same direction, a repulsive force is generated between the connecting portion 410 and the second magnetic conductor 60, which is further advantageous for separation.

[0087] From this, it can be seen that the first magnetic conductor 40 is fixedly provided relative to the contact container 10, and a fixed short-circuit resistant structure is formed between the magnetic conductive part 420 and the third magnetic conductor 55; the second magnetic conductor 60 is fixedly connected to the support seat 52 of the push rod assembly 50, and a adaptive short-circuit resistant structure is formed between the second magnetic conductor 60 and the third magnetic conductor 55; the magnetic conductive part 420 of the first magnetic conductor 40 and the second magnetic conductor 60 are offset along the axial direction of the rod part 51; and the connection part 410 of the first magnetic conductor 40 and the second magnetic conductor 60 correspond along the axial direction of the rod part 51. Therefore, the relay according to the disclosed embodiment satisfies the requirements of short-circuit resistance and limit disconnection, while the first magnetic conductor 40 does not occupy excessive space perpendicular to the axial direction of the rod part 51, which is advantageous for reducing the volume of the relay.

[0088] It can be understood that when the movable contact assembly 53 is in the first position relative to the push rod assembly 50, there may be direct contact between the second magnetic conductor 60 and the first magnetic conductor 55 or there may be a gap between them.

[0089] In this embodiment, the movable contact assembly 53 is in a first position relative to the push rod assembly 50, and the second magnetic conductor 60 is in direct contact with the first magnetic conductor 55. As a result, a relatively large portion of the magnetic flux flows in the magnetic circuit formed by the second magnetic conductor 60 and the third magnetic conductor 55, and a relatively small portion of the magnetic flux flows in the magnetic circuit formed by the magnetic conductive portion 420 and the second magnetic conductor 55. The magnetic attraction force between the magnetic conductive portion 420 and the third magnetic conductor 55 is relatively small, which is advantageous for separating the movable contact piece 54 and the fixed contact lead-out end 20.

[0090] As shown in FIGS. 4 and 5, the magnetic conductive part 420 and the connecting part 410 are integrally formed, and the magnetic conductive part 420 extends from the connecting part 410 toward the movable contact piece 54 .

[0091] In this embodiment, the first magnetic conductor 40 includes two magnetic conductive portions 420 arranged opposite each other, and the two magnetic conductive portions 420 are respectively connected to two opposite side edges along the longitudinal direction D2 of the movable contact piece 54 of the connecting portion 410, forming the first magnetic conductor 40 into an inverted U shape.

[0092] Of course, in other embodiments, the first magnetic conductive body 40 may be L-shaped, with one side of the L-shape being the connecting portion 410 and the other side being the magnetic conductive portion 420.

[0093] As shown in Figures 4 and 5, the relay of the disclosed embodiment further includes a connecting member 30, which is inserted into the second through-hole 103 and includes a first end 31 and a second end 32, where the first end 31 is connected to the contact container 10 and the second end 32 is connected to the first magnetic conductor 40.

[0094] In the relay of the disclosed embodiment, the connection portion 410 of the first magnetic conductor 40 is connected to the contact container 10 via the connection member 30, and is not directly connected to the contact container 10, so that the connection process is unobstructed, visible, easy to operate, and the reliability of the connection is ensured.

[0095] Furthermore, the first through-hole 102 and the second through-hole 103 are both opened in the upper wall 111 of the ceramic cover 11 , and the first end 31 of the connecting member 30 is connected to the outer wall surface of the upper wall 111 .

[0096] On the outer wall surface of the upper wall 111, a first metallization layer 113 is provided around the periphery of the first through hole 102, and a second metallization layer 114 is provided around the periphery of the second through hole 103. The fixed contact lead-out end 20 is welded to the upper wall 111 via the first metallization layer 113, and the first end 31 of the connecting member 30 is welded to the upper wall 111 via the second metallization layer 114.

[0097] Compared with the inner wall surface of the ceramic cover 11, the outer wall surface of the upper wall 111 of the ceramic cover 11 is easier to form a welding plane. Furthermore, the upper wall 111 of the ceramic cover 11 is required to provide the fixed contact lead-out end 20, and a metallized layer must be provided around the periphery of the first through hole 102 when the fixed contact lead-out end 20 and the upper wall 111 are welded together. Therefore, when processing the first metallized layer 113 of the first through hole 102, the second metallized layer 114 of the second through hole 103 is also processed at the same time. Therefore, by welding the connecting member 30 to the outer wall surface of the upper wall 111 of the ceramic cover 11, it is not necessary to process a metallized layer on the inner wall surface of the upper wall 111, and a metallized layer can be processed only on the outer wall surface of the upper wall 111, which is convenient and simplifies the processing steps.

[0098] There is a gap between the connection portion 410 of the first magnetic conductor 40 and the inner wall surface of the upper wall 111. By providing a gap between the connection portion 410 of the first magnetic conductor 40 and the inner wall surface of the upper wall 111, there is a gap between the connection portion 410 and the inner wall surface of the upper wall 111. Because the connection portion 410 does not directly contact the inner wall surface of the upper wall 111, the provision of the first magnetic conductor 40 does not affect the creepage distance between the pair of fixed contact lead-out ends 20.

[0099] The top wall 111 and the side wall 112 are separate structures and are joined by welding.

[0100] It can be seen that designing the ceramic cover 11 as a separate structure with the top wall 111 and the side wall 112 makes it easier to connect the connecting member 30 to the top wall 111. Of course, the top wall 111 and the side wall 112 may be joined by adhesive.

[0101] Specifically, because the upper wall 111 is sheet-shaped, the sheet-shaped structure makes it easy to process the first through-hole 102, the second through-hole 103, the first metallized layer 113, and the second metallized layer 114 on the upper wall 111. Furthermore, the sheet-shaped structure makes it easy to weld the connecting member 30 to the upper wall 111, and the fixed contact lead-out end 20 to the upper wall 111.

[0102] Of course, the top wall 111 and the side wall 112 may be integrally formed.

[0103] The second end 32 of the connecting member 30 and the first magnetic conductive body 40 can be connected by various methods such as welding, caulking, or adhesive.

[0104] Of course, in other embodiments, the method of fixedly providing the first magnetic conductive body 40 to the contact vessel 10 may be such that the first magnetic conductive body 40 is fixedly connected to the ceramic cover 11 via the connecting member 30, or the first magnetic conductive body 40 is fixedly connected to a fixed frame. Specifically, the relay further includes a fixed frame, which is provided in the contact chamber 101 and fixedly connected to the yoke plate 13. The connecting portion 410 of the first magnetic conductive body 40 is fixedly connected to the fixed frame.

[0105] It is to be understood that the present disclosure is not limited to the precise construction and arrangement of components described herein. The present disclosure is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. The disclosure as disclosed and limited herein is understood to extend to all alternative combinations of two or more of the individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute various alternative aspects of the present disclosure. The embodiments described herein represent the best mode known for carrying out the disclosure and are intended to enable others skilled in the art to utilize the disclosure. [Explanation of symbols]

[0106] 10 Contact container 101 Contact Chamber 102 first through hole 103 Second through hole 11a Insulation cover 11 Ceramic cover 111 Upper Wall 112 Side wall 113 First Metallization Layer 114 Second Metallization Layer 12 Flange member 13 York board 131 Third Through Hole 20 Fixed contact lead-out end 30 Connecting member 31 First end of connecting member 32 second end of connecting member 40 First magnetic conductor 410 Connection 420 Magnetic Conductive Part 50 Push rod assembly 51 Rod section 52 Support seat 521 Base 522 Bracket 523 Upper 524 Side 53 Moving Contact Assembly 54 Movable contact piece 55 Third Magnetic Conductor 56 Elastic Body 60 Second magnetic conductor 1100 Housing, first case 1120 Second Case 1130 Exposure hole 1200 Electromagnet Unit 1210 Coil bobbin 1220 coil 1240 moving core 1250 Reset member 1300 Arc Extinguishing Unit 1310 Arc-extinguishing magnet 1320 Yoke Clamp 1400 Seal Unit 1410 Metal Cover D1 Motion direction D2 Length direction

Claims

1. A relay, a contact receptacle, a pair of fixed contact lead ends, a first magnetic conductor, a push rod assembly, and a movable contact assembly; the contact vessel has a contact chamber; the pair of fixed contact lead-out ends are connected to the contact container, and at least a portion of each of the fixed contact lead-out ends is located within a contact chamber; the first magnetic conductor is provided within the contact chamber; the first magnetic conductor includes a connecting portion and a magnetic conductive portion connected to the connecting portion; the first magnetic conductor is fixed to the contact container via the connecting portion; the push rod assembly includes a rod portion and a second magnetic conductor; the rod portion is movable along an axial direction of the rod portion relative to the contact vessel; the second magnetic conductor is provided at one end of the rod portion, the second magnetic conductor is offset from the magnetic conductive portion along the axial direction of the rod portion, and corresponds to the connection portion; the movable contact assembly is movable relative to the push rod assembly along an axial direction of the rod portion between a first position approaching the fixed contact lead-out end and a second position away from the fixed contact lead-out end; the movable contact assembly includes a movable contact piece and a third magnetic conductor; the first magnetic conductor and the second magnetic conductor are provided on a side of the movable contact piece facing the fixed contact lead-out end, the third magnetic conductor is fixedly connected to the movable contact piece on a side thereof facing away from the first magnetic conductor and the second magnetic conductor along the axial direction of the rod portion, the third magnetic conductor and the first magnetic conductor are used to form a first magnetic conductive circuit; the third magnetic conductor and the second magnetic conductor are used to form a second magnetic conductive circuit; A relay, characterized in that the distance between the third magnetic conductor and the connection portion is greater than the distance between the third magnetic conductor and the magnetic conductive portion.

2. The movable contact assembly further includes an elastic body connecting the movable contact assembly and the push rod assembly.

2. The relay according to claim 1, wherein the elastic body is used to apply an elastic force to the movable contact assembly to move it toward the first position.

3. 2. The relay according to claim 1, wherein the magnetic conductive portion and the connecting portion are integrally formed, and the magnetic conductive portion extends from the connecting portion toward the movable contact piece.

4. the first magnetic conductor includes two magnetic conductive portions disposed opposite to each other, 4. The relay according to claim 3, wherein the two magnetic conductive portions are connected to two opposing sides of the connecting portion along the length direction of the movable contact piece, forming the first magnetic conductor in an inverted U shape.

5. 2. The relay of claim 1, wherein, when the movable contact assembly is in the first position, a magnetic distance between the magnetically conductive portion and the third magnetic conductive body is greater than a magnetic distance between the second magnetic conductive body and the third magnetic conductive body.

6. 6. The relay of claim 5, wherein the second magnetic conductor is in direct contact with the third magnetic conductor when the movable contact assembly is in the first position.

7. The push rod assembly further includes a support seat; the support seat is fixedly provided at one axial end of the rod portion and extends at least partially into the contact chamber; the second magnetic conductor is fixedly connected to the support seat; 3. The relay according to claim 2, wherein the elastic body is provided between the movable contact assembly and the support seat.

8. The support seat includes a base and a bracket; the base is connected to one end of the rod portion; the elastic body is provided between the base and the movable contact assembly; the bracket is connected to the base; the second magnetic conductor is connected to an inner wall surface of the bracket; 8. The relay according to claim 7, wherein the movable contact piece and the third magnetic conductor are movably provided in a space surrounded by the base and the bracket.

9. The bracket includes a top and two sides; the second magnetic conductor is connected to an inner wall surface of the upper portion, the two side portions are connected to opposite sides of the upper portion and extend from the upper portion toward the base; one end of each of the two side portions remote from the top portion is connected to the base, 9. The relay of claim 8, wherein the two sides, the top, and the base together define a space for movement of the movable contact assembly.

10. the contact vessel further has a pair of first and second through holes; the first through hole and the second through hole are each connected to the contact chamber; The pair of fixed contact lead-out ends are inserted into the pair of first through holes in a one-to-one correspondence, The relay further includes a connecting member; the connecting member is inserted into the second through-hole and includes a first end and a second end; the first end is connected to the contact vessel; The relay according to claim 1 , wherein the second end is connected to the connection portion.

11. The contact vessel includes a yoke plate and an insulating cover; the insulating cover includes a top wall and a side wall; One end of the side wall is connected to the periphery of the top wall and surrounds it, and the other end of the side wall is connected to the yoke plate, the first through hole and the second through hole are opened in the upper wall, The relay according to claim 10 , wherein a first end of the connecting member is connected to an outer wall surface of the upper wall.

12. the insulating cover includes a ceramic cover and a flange member; the ceramic cover includes the top wall and the side wall; the other end of the side wall is connected to the yoke plate via the flange member, a first metallization layer is provided on a periphery of the outer wall surface of the upper wall, the periphery being located at a first through hole; and a second metallization layer is provided on a periphery of the outer wall surface of the upper wall, the periphery being located at a second through hole; the fixed contact lead end is welded to the top wall through the first metallization layer; 12. The relay of claim 11, wherein the first end of the connecting member is welded to the top wall through the second metallization layer.

13. The relay according to claim 11, wherein the top wall and the side wall are integral or separate structures and are connected by welding.

14. The relay according to claim 11, wherein the connection portion and the inner wall surface of the upper wall are spaced apart from each other.

15. the contact container includes a yoke plate and an insulating cover connected to the yoke plate; the relay further includes a stationary frame; the fixed frame is provided in the contact chamber and fixed to the yoke plate; The relay according to claim 1 , wherein the connection portion is fixedly connected to the fixed frame.

Images