relay

Abstract

The present disclosure provides a relay that combines short-circuit resistance and limit cut-off capability. The relay includes a contact receptacle (10), a pair of fixed contact leads (20) connected to the contact receptacle (10), a first magnetic conductor (40) fixedly disposed within the contact receptacle (10), and a push rod assembly (50). The push rod assembly includes a movable contact (54) disposed within the contact container (10), and a second magnetic conductor (591) and a third magnetic conductor (55) fixedly connected to the movable contact (54). Along the moving direction of the push rod assembly (50), the second magnetic conductor (591) and the third magnetic conductor (55) are disposed on two opposite sides of the movable contact (54) to form a first magnetic conductive circuit. Along the moving direction of the push rod assembly (50), the second magnetic conductor (591) is disposed between the first magnetic conductor (40) and the movable contact (54), and the first magnetic conductor (40) and the third magnetic conductor (55) form a second magnetic conductive circuit.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This disclosure claims priority to Chinese Patent Application No. 202211248990.1, filed on October 12, 2022, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD Embodiments of the present disclosure relate to the technical field of electronic components, and more particularly to relays. [Background technology]

[0002] A relay is an electronic control device that has a control system (also called input circuit) and a controlled system (also called output circuit), and is usually applied in automatic control circuits. A relay is actually an "automatic switch" that controls a large current with a small current. Therefore, in the circuit, it plays roles such as automatic adjustment, safety protection, and conversion circuit.

[0003] High-voltage DC relays are a type of relay. To address the problem of contacts of high-voltage DC relays being flipped open due to the electromotive repulsive force generated by short-circuit current, related technologies typically employ a short-circuit-resistant ring electromagnetic structure. Depending on the 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 located on the movable assembly of the relay, while a fixed structure refers to an upper yoke located in a fixed position other than the movable assembly. However, while the fixed structure significantly enhances short-circuit resistance, its disconnection capability is reduced due to a negative correlation between short-circuit resistance and disconnection capability. On the other hand, a tracking structure is affected by the holding force of the movable core, so a large short-circuit current can cause the core to separate and the contacts to disconnect. Increasing the holding force of the movable core requires a larger coil, which contradicts the goal of reducing volume and weight. Summary of the Invention

[0004] The embodiments of the present disclosure provide a relay that can provide both short-circuit withstanding capability and limit breaking capability.

[0005] A relay according to an embodiment of the present disclosure includes a contact can, a pair of fixed contact lead ends, a first magnetic conductor, and a push rod assembly, wherein the contact can has a contact chamber, the pair of fixed contact lead ends are fixedly disposed relative to the contact can, the first magnetic conductor is disposed in the contact chamber and fixedly disposed relative to the contact can, the push rod assembly includes a movable contact disposed in the contact chamber, a second magnetic conductor, and a third magnetic conductor, the movable contact is in contact with or spaced apart from the pair of fixed contact lead ends, the second magnetic conductor and the third magnetic conductor are both fixedly connected to the movable contact, and the push rod assembly Along the movement direction of the reel, at least a portion of the second magnetic conductor and the third magnetic conductor are arranged on two opposite sides of the movable contactor, the first magnetic conductor and the second magnetic conductor are both located on the side of the movable contactor facing the fixed contact pull-out end, the second magnetic conductor is arranged between the first magnetic conductor and the movable contactor, the second magnetic conductor and the third magnetic conductor form a first magnetic conductive circuit, and the first magnetic conductor and the third magnetic conductor form a second magnetic conductive circuit.

[0006] According to some embodiments of the present disclosure, the thickness of the first magnetic conductive body is greater than or equal to the thickness of the second magnetic conductive body.

[0007] According to some embodiments of the present invention, the contact container further includes a pair of first and second through holes, the first and second through holes both communicating with the contact chamber, and the pair of fixed contact lead-out ends being inserted into the pair of first through holes in a one-to-one correspondence; The relay further includes a connecting member inserted into the second through-hole and having a first end and a second end, the first end being connected to the contact container and the second end being connected to the first magnetic conductor.

[0008] According to some embodiments of the present disclosure, the contact vessel comprises: a yoke plate having a third through hole, the push rod assembly being movably inserted into the third through hole; an insulating cover having an upper wall and a side wall, one end of the side wall being surrounded by and connected to the upper wall, and the other end of the side wall being 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.

[0009] According to some embodiments of the present invention, the insulating cover includes a ceramic cover and a flange member, the ceramic cover has 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 around the periphery of the first through hole, and a second metallized layer is provided on an outer wall surface of the upper wall around the periphery of 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.

[0010] According to some embodiments of the present disclosure, the top wall and the side wall are of one unitary structure, or the top wall and the side wall are of separate structure.

[0011] According to some embodiments of the present disclosure, the first magnetic conductive body is disposed spaced apart from the inner wall surface of the upper wall.

[0012] According to some embodiments of the present disclosure, the second end of the connecting member is crimped, welded, or glued to the first magnetic conductive body.

[0013] According to some embodiments of the present disclosure, the first magnetic conductor comprises a plurality of stacked magnetic conductive sheets, and the plurality of magnetic conductive sheets are connected to the second end of the connecting member.

[0014] According to some embodiments of the present disclosure, the contact vessel comprises: a yoke plate having a third through hole, the push rod assembly being movably inserted into the third through hole; an insulating cover connected to the yoke plate, The relay further includes a fixed frame disposed within the contact chamber and fixedly connected to the yoke plate, and the first magnetic conductor is fixedly connected to the fixed frame.

[0015] According to some embodiments of the present disclosure, the push rod assembly comprises: With a base, an elastic member having one end abutting against the base and the other end abutting against a movable assembly consisting of the movable contact, the second magnetic conductor, and the third magnetic conductor, and providing an elastic force so that the movable contact tends to move toward the fixed contact pull-out end; a limit structure connected to the base and the movable assembly, the limit structure limiting a range of movement of the movable assembly relative to the base; the limit structure includes a limit hole and a limit portion to be fitted together, the limit hole includes a first hole wall and a second hole wall arranged opposite to each other along the moving direction of the movable contact, and the limit portion is movably inserted between the first hole wall and the second hole wall of the limit hole, Here, when the movable contactor is separated from the fixed contact drawn-out end, the limit portion is positioned on the first hole wall of the limit hole.

[0016] According to some embodiments of the present disclosure, the second pore wall has a larger size than the first pore wall.

[0017] According to some embodiments of the present invention, the limit portion has a first arcuate surface, and the first arcuate surface establishes a limit with the limit hole when the limit portion is positioned on the first hole wall of the limit hole.

[0018] According to some embodiments of the present invention, the limiting portion is a rivet, and the rivet is crimped to the third magnetic conductive body.

[0019] According to some embodiments of the present invention, the movable assembly further comprises a fixed member, the fixed member being fixedly connected to the third magnetic conductive body, one of the fixed member and the base being provided with the limit portion, and the other of the fixed member and the base being provided with the limit hole.

[0020] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0021] In the relay of the embodiment of the present disclosure, the second magnetic conductor and the third magnetic conductor form a first magnetic conductive circuit, and the first magnetic conductor and the third magnetic conductor form a second magnetic conductive circuit. Through the cooperation of the first magnetic conductor, the second magnetic conductor, and the third magnetic conductor, the relay of the embodiment of the present disclosure can improve its short-circuit resistance while meeting the limit disconnection requirements. [Brief explanation of the drawings]

[0022] The above 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. [Figure 1] 1 shows a three-dimensional schematic diagram of a relay according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along the AA plane of FIG. [Figure 3] 3 is a schematic diagram showing a first magnetic conductive circuit formed by a second magnetic conductive body and a third magnetic conductive body. FIG. [Figure 4] 1 is a schematic diagram showing how a second magnetic conductor and a third magnetic conductor form a first magnetic conductive circuit, and how the first magnetic conductor and a third magnetic conductor form a second magnetic conductive circuit. FIG. [Figure 5] 2 is an exploded schematic view showing the fixed contact lead-out end, the ceramic cover, the connecting member, and the first magnetic conductor of FIG. 1. FIG. [Figure 6] 6 shows a cross-sectional view along the axis of the connecting member of FIG. 5; [Figure 7] 1 is a schematic diagram illustrating a push rod assembly according to a first embodiment of the present disclosure. [Figure 8] FIG. 8 is an exploded schematic view of FIG. 7. [Figure 9] FIG. 8 is a partial enlarged view of the X portion of FIG. 7. [Figure 10] FIG. 8 is a cross-sectional view taken along the plane BB in FIG. 7. [Figure 11] FIG. 10 is an exploded schematic view showing a push rod assembly according to a second embodiment of the present disclosure. [Figure 12] FIG. 10 is an exploded schematic view showing a push rod assembly according to a third embodiment of the present disclosure. [Figure 13] FIG. 10 is an exploded schematic view showing a push rod assembly according to a fourth embodiment of the present disclosure. [Figure 14] FIG. 10 is an exploded schematic view showing a push rod assembly according to a fifth embodiment of the present disclosure. [Figure 15] FIG. 10 is an exploded schematic view showing a push rod assembly according to a sixth embodiment of the present disclosure. [Figure 16] 1 is a schematic diagram showing a state in which a first magnetic conductor is fixedly connected to a fixed frame. [Explanation of Symbols] Here, the explanations of the reference symbols are as follows.

[0023] 10. Contact container; 101. Contact chamber; 102. First through hole; 103. Second through hole; 11a. Insulating cover; 11. Ceramic cover; 111. Top wall; 112. Side wall; 113. First metallization layer; 114. Second metallization layer; 12. Flange member; 13. Yoke plate; 131. Third through hole; 20. Fixed contact lead end; 30. Connecting member; 31. First end of connecting member; 32. Second end of connecting member; 40. First magnetic conductor; 41. Magnetic conductive sheet; 411. Opening portion; 50. Push rod assembly; 51. Rod portion; 52. Base; 521. Base; 522. First limit member; 523. Second limit member; 524. Second arcuate surface; 53. Movable assembly; 54. Movable contactor; 55, third magnetic conductor; 551, bottom; 552, first side; 553, second side; 56, elastic member; 57, limit structure; 571, limit portion; 571a, first arcuate surface; 572, limit hole; 573, first hole wall of limit hole; 574, second hole wall of limit hole; 577, first inclined wall; 578, second inclined wall; 579, rivet; 58, fixing member; 591, second magnetic conductor; 592, coil bobbin; 593, coil; 594, fixed iron core; 595, movable iron core; 596, reset member; 60, drive assembly; 70, fixed frame; φ1, first magnetic conductive circuit; φ2, second magnetic conductive circuit; D1, movement direction; D2, length direction; D3, width direction. DETAILED DESCRIPTION OF THE INVENTION

[0024]

[0023] Exemplary embodiments will now be described in more detail with reference to the accompanying drawings. However, exemplary embodiments may be embodied in many forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings indicate the same or similar structures, detailed descriptions will be omitted.

[0025] It is understood that the terms "comprise," "have," and variations thereof in the embodiments of the present disclosure are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, and can optionally include steps or units that are not listed, or can optionally include other steps or components that are inherent to the process, method, product, or apparatus.

[0026] As shown in Figures 1 and 2, Figure 1 shows a three-dimensional schematic diagram of a relay according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view taken along plane AA in Figure 1. The relay according to the embodiment of the present disclosure includes a contact receptacle 10, a pair of fixed contact leads 20, a first magnetic conductor 40, a push rod assembly 50, and a drive assembly 60.

[0027] The contact container 10 includes a yoke plate 13 and an insulating cover 11a. The insulating cover 11a is arranged to cover one side of the yoke plate 13, forming a contact chamber 101 of the contact container 10. A pair of fixed contact lead-out ends 20 are connected to the contact container 10, with one end of each fixed contact lead-out end 20 extending into the contact chamber 101. The push rod assembly 50 includes a movable contact 54, both ends of which can contact or be separated from the pair of fixed contact lead-out ends 20.

[0028] A drive assembly 60 is connected to the push rod assembly 50 and drives the movable contact 54 to move to effect contact closure.

[0029] As an example, the drive assembly 60 includes a coil bobbin 592, a coil 593, a fixed core 594, and a movable core 595. The coil bobbin 592 has a hollow cylindrical shape and is made of an insulating material. The coil 593 surrounds the coil bobbin 592. The fixed core 594 is fixed relative to the coil bobbin 592. The movable core 595 is connected to the push rod assembly 50 and is disposed opposite the fixed core 594. When the coil 593 is energized, the movable core 595 is attracted to the fixed core 594, moving the push rod assembly 50 and causing the movable contact 54 to contact the pair of fixed contact lead-out ends 20.

[0030] The drive assembly 60 further includes a reset member 596 disposed between the fixed core 594 and the movable core 595, and configured to reset the movable core 595 when the current in the coil 593 is cut off. In one embodiment, the reset member 596 may be, but is not limited to, a spring.

[0031] The first magnetic conductive body 40 is disposed in the contact chamber 101 and is fixed relative to the contact vessel 10 .

[0032] The push rod assembly 50 includes a movable contact 54, a second magnetic conductor 591, and a third magnetic conductor 55 arranged in the contact chamber 101. The second magnetic conductor 591 and the third magnetic conductor 55 are both fixedly connected to the movable contact 54, and the second magnetic conductor 591 and the third magnetic conductor 55 move together with the movable contact 54. Along the movement direction D1 of the push rod assembly 50, at least a portion of the second magnetic conductor 591 and the third magnetic conductor 55 are arranged on two opposite sides of the movable contact 54. The first magnetic conductor 40 and the second magnetic conductor 591 are both located on the side of the movable contact 54 facing the fixed contact lead-out end 20. Along the movement direction D1 of the push rod assembly 50, the second magnetic conductor 591 is arranged between the first magnetic conductor 40 and the movable contact 54.

[0033] 2, the first magnetic conductor 40, the second magnetic conductor 591, the movable contact 54, and the third magnetic conductor 55 are arranged in this order from top to bottom inside the contact container 10. In other words, the first magnetic conductor 40 and the second magnetic conductor 591 are arranged on one side of the movable contact 54, and the third magnetic conductor 55 is arranged on the opposite side of the movable contact 54.

[0034] As shown in FIG. 3, the second magnetic conductor 591 and the third magnetic conductor 55 form a first magnetic conductive circuit φ1. When the current flowing through the movable contact 54 is equal to or less than the critical disconnection current, the magnetic flux generated in the first magnetic conductive circuit φ1 is small. Because the second magnetic conductor 591 is closer to the third magnetic conductor 55 than the first magnetic conductor 40, most of the magnetic flux is concentrated between the second magnetic conductor 591 and the third magnetic conductor 55 (as indicated by the arrows in FIG. 3). Thus, the first magnetic conductor 40 generates almost no attractive force. Because the second magnetic conductor 591 and the third magnetic conductor 55 are fixed on the movable contact 54, the attractive force between the second magnetic conductor 591 and the third magnetic conductor 55 is an internal force and does not exert a force on the movable contact 54. Therefore, below the critical disconnection current, the movable contact 54 does not experience any additional holding force that would affect normal disconnection.

[0035] As shown in Fig. 4, the second magnetic conductor 591 and the third magnetic conductor 55 form a first magnetic conductive circuit φ1, and the first magnetic conductor 40 and the third magnetic conductor 55 form a second magnetic conductive circuit φ2. When the current flowing through the movable contact 54 gradually increases and exceeds the critical disconnection current, the generated magnetic flux becomes relatively large, the second magnetic conductor 591 reaches magnetic saturation, and the remaining magnetic flux flows through the first magnetic conductor 40. As a result, a double magnetic conductive circuit is formed, in which the second magnetic conductor 591 and the third magnetic conductor 55 form the first magnetic conductive circuit φ1, and the first magnetic conductor 40 and the third magnetic conductor 55 form the second magnetic conductive circuit φ2. When a large short-circuit current occurs, magnetic flux is present in the first magnetic conductor 40, and an attractive force is generated between the first magnetic conductor 40 and the third magnetic conductor 55. This attractive force can be used to prevent the movable contact 54 from flicking off in a short-circuit current state.

[0036] This shows that the second magnetic conductor 591 has two functions. First, the second magnetic conductor 591 shares part of the magnetic flux, and can reduce the attractive force of the first magnetic conductor 40 against the third magnetic conductor 55. Because the second magnetic conductor 591 and the third magnetic conductor 55 are both fixedly connected to the movable contact 54, the attractive force between the second magnetic conductor 591 and the third magnetic conductor 55 is an internal force. Therefore, the second magnetic conductor 591 can reduce the attractive force of the first magnetic conductor 40 against the third magnetic conductor 55, which is advantageous for realizing limit disconnection. Second, because the first magnetic conductor 40 and the second magnetic conductor 591 are arranged on the same side of the movable contact 54, the magnetic fields of the first magnetic conductor 40 and the second magnetic conductor 591 are directed in the same direction (both on the right side as shown in FIG. 4), and a mutual repulsive force is generated between the first magnetic conductor 40 and the second magnetic conductor 591. Furthermore, because the first magnetic conductor 40 is fixedly arranged relative to the contact container 10, and the second magnetic conductor 591, the third magnetic conductor 55, and the movable contact 54 are fixedly connected to each other, this is equivalent to the first magnetic conductor 40 exerting a repulsive force on the second magnetic conductor 591, and this repulsive force is also advantageous for realizing limit disconnection.

[0037] As described above, in the relay of the embodiment of the present disclosure, the second magnetic conductor 591 and the third magnetic conductor 55 form the first magnetic conductive circuit φ1, and the first magnetic conductor 40 and the third magnetic conductor 55 form the second magnetic conductive circuit φ2. Through the cooperation of the first magnetic conductor 40, the second magnetic conductor 591, and the third magnetic conductor 55, the relay of the embodiment of the present disclosure can improve its short-circuit resistance capability while meeting the limit disconnection requirements.

[0038] It should also be noted that since the second magnetic conductor 591, the third magnetic conductor 55 and the movable contact 54 are fixedly connected to each other, and the first magnetic conductor 40 and the second magnetic conductor 591 are arranged on the same side of the movable contact 54, the repulsive force exerted by the first magnetic conductor 40 on the second magnetic conductor 591 is equivalent to that acting directly on the movable contact 54, and the movable contact 54 can be separated from the fixed contact pull-out end 20 in a timely manner, thereby avoiding contact adhesion.

[0039] It is understood that the first magnetic conductive body 40, the second magnetic conductive body 591, and the third magnetic conductive body 55 can all be made of materials such as iron, cobalt, nickel, and alloys thereof.

[0040] Continuing to refer to Figures 2 to 4, the first magnetic conductor 40 and the second magnetic conductor 591 may both be linear, and the third magnetic conductor 55 may be U-shaped, but is not limited to this.

[0041] The thickness of the first magnetic conductor 40 (the dimension along the moving direction D1 of the movable contact 54) is greater than or equal to the thickness of the second magnetic conductor 591. Of course, if the first magnetic conductor 40 has stronger magnetism, the thickness of the first magnetic conductor 40 can also be made smaller than the thickness of the second magnetic conductor 591.

[0042] As shown in FIGS. 5 and 6, FIG. 5 is an exploded schematic view of the fixed contact lead-out end 20, ceramic cover 11, connecting member 30, and first magnetic conductor 40 of FIG. 1. FIG. 6 is a cross-sectional view of the connecting member 30 of FIG. 5 along the axis. The first magnetic conductor 40 is fixedly connected to the contact vessel 10. Specifically, the contact vessel 10 further has a pair of first through holes 102 and a pair of second through holes 103, both of which are connected to the contact chamber 101. 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. The relay further includes a connecting member 30 inserted into the second through hole 103 and having a first end 31 and a second end 32, the first end 31 being connected to the contact vessel 10, and the second end 32 being connected to the first magnetic conductor 40.

[0043] In the relay of this embodiment, the contact container 10 is provided with a second through-hole 103, and the connecting member 30 passes through the second through-hole 103, thereby connecting the connecting member 30 to the contact container 10 and connecting the first magnetic conductor 40 to the connecting member 30. The first magnetic conductor 40 is not directly connected to the contact container 10 but is connected to the contact container 10 via the connecting member 30, which makes the connection process visible without obstruction, facilitating operation, and ensuring connection reliability.

[0044] As shown in FIGS. 2 and 6 , 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 is a metal member having an annular structure 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, which can also be connected by laser welding, brazing, resistance welding, or adhesive bonding. The flange member 12 is disposed between the ceramic cover 11 and the yoke plate 13 to facilitate connection between the ceramic cover 11 and the yoke plate 13.

[0045] 5, ceramic cover 11 includes top wall 111 and side wall 112, one end of side wall 112 is surrounded by and connected to the outer periphery of top wall 111, and the other end of side wall 112 is connected to yoke plate 13 via flange member 12. First through hole 102 and second through hole 103 are both formed in top wall 111, and first end 31 of connecting member 30 is connected to the outer wall surface of top wall 111.

[0046] It can be seen that one of the pair of fixed contact lead-out ends 20 functions as a terminal for current to flow in, and the other functions as a terminal for current to flow out. The fixed contact lead-out end 20 is inserted into the first through-hole 102, and a portion of the fixed contact lead-out end 20 extends into the contact chamber 101 to make contact with or separate from the movable contactor 54. A portion of the fixed contact lead-out end 20 is exposed on the outer wall surface of the ceramic cover 11.

[0047] The bottom of the fixed contact pull-out end 20 functions as a fixed contact, and both ends of the movable contactor 54 along the length direction D2 can function as movable contacts. The movable contacts at both ends of the movable contactor 54 may protrude from other parts of the movable contactor 54 or may be flush with other parts.

[0048] It is understood that the fixed contact may be disposed integrally or separately at the bottom of the fixed contact pull-out end 20, and the movable contact may be disposed integrally or separately at both ends of the length direction D2 of the movable contactor 54.

[0049] The second through-hole 103 may be disposed between two first through-holes 102. That is, the connection member 30 is disposed between a pair of fixed contact lead-out ends 20.

[0050] The number of the connection members 30 may be one or more. In this embodiment, the number of the connection members 30 is two, but is not limited to this.

[0051] 5, a first metallization layer 113 is provided on the outer wall surface of the upper wall 111 of the ceramic cover 11 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.

[0052] 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 surface on. Furthermore, the upper wall 111 of the ceramic cover 11 must be provided with the fixed contact lead-out end 20, and when welding the fixed contact lead-out end 20 to the upper wall 111, a metallized layer must be formed around the periphery of the first through-hole 102. 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, a metallized layer can be processed only on the outer wall surface of the upper wall 111 without processing a metallized layer on the inner wall surface of the upper wall 111, which is convenient and simplifies the processing steps.

[0053] The first magnetic conductor 40 is spaced apart from the inner wall surface of the upper wall 111, and the length of the connecting piece 30 is longer than the sum of the thickness of the upper wall 111 and the thickness of the first magnetic conductor 40, so that the first magnetic conductor 40 is suspended from the upper wall 111 of the ceramic cover 11 via the connecting piece 30.

[0054] By separating the first magnetic conductor 40 from the inner wall surface of the upper wall 111, a gap is formed between the first magnetic conductor 40 and the inner wall surface of the upper wall 111. Because the first magnetic conductor 40 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.

[0055] 5 and 6, the first magnetic conductor 40 includes a plurality of stacked magnetic conductive sheets 41, which are connected to the second end 32 of the connecting member 30. Each magnetic conductive sheet 41 has an opening 411, and the connecting member 30 passes through the opening 411 and is crimped to the magnetic conductive sheet 41.

[0056] Of course, when the first magnetic conductor 40 includes a plurality of stacked magnetic conductive sheets 41, the opening 411 of the lowest magnetic conductive sheet 41 may be a blind hole, and the openings 411 of the remaining magnetic conductive sheets 41 may be through holes. The connecting member 30 is inserted into each opening 411 of the remaining magnetic conductive sheets 41, and the second end of the connecting member 30 extends into the blind hole of the lowest magnetic conductive sheet 41 and is welded to this magnetic conductive sheet 41.

[0057] Furthermore, when the first magnetic conductor 40 is a single piece, an opening 411 is provided in the first magnetic conductor 40, and the opening 411 may be a through hole or a blind hole. When the opening 411 is a through hole, the connection member 30 passes through the opening 411 and is crimped to the first magnetic conductor 40. When the opening 411 is a blind hole, solder is placed in the blind hole, and the second end 32 of the connection member 30 extends into the blind hole and is welded to the first magnetic conductor 40.

[0058] For example, if the short-circuit current is 10 kA or more, it is necessary to increase the thickness of the first magnetic conductor 40 to generate a greater magnetic attractive force, so that the magnetic attractive force between the first magnetic conductor 40 and the second magnetic conductor 591 can overcome the repulsive force generated by the short-circuit current and prevent the movable contact 54 from popping off the fixed contact lead-out end 20. However, as the thickness of the first magnetic conductor 40 increases, the cost increases and it becomes more difficult to connect it to the ceramic cover 11.

[0059] In this embodiment, the first magnetic conductor 40 is connected to the contact vessel 10 via the connecting member 30. Therefore, the first magnetic conductor 40 includes multiple stacked magnetic conductive sheets 41, which are connected by the connecting member 30 penetrating the second through-holes 103. Increasing the number of thin magnetic conductive sheets 41 increases the overall thickness of the first magnetic conductor 40. Meanwhile, the magnetic conductive sheets 41 are relatively thin and can be made from a thin strip-shaped material, resulting in low material costs and easy handling. Meanwhile, the number of magnetic conductive sheets 41 can be flexibly adjusted depending on the magnitude of the short-circuit current.

[0060] It will be understood that the second magnetic conductor 591 and the third magnetic conductor 55 may also comprise multiple stacked magnetic conductors, or the third magnetic conductor 55 may comprise multiple U-shaped magnetic conductors arranged side by side.

[0061] The top wall 111 and the side wall 112 of the ceramic cover 11 may be separate structures or may be connected by welding. It can be seen that designing the ceramic cover 11 to have a separate structure for the top wall 111 and the side wall 112 makes it more convenient to connect the connecting member 30 to the top wall 111. Of course, the top wall 111 and the side wall 112 may also be connected by adhesive.

[0062] 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 in 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.

[0063] Of course, the upper wall 111 and the side wall 112 of the ceramic cover 11 may be integrally formed.

[0064] The second end 32 of the connection member 30 and the first magnetic conductive body 40 can be connected by various methods such as welding, crimping, or adhesive bonding.

[0065] In this embodiment, the second end 32 of the connection member 30 is crimped to the first magnetic conductor 40. Specifically, the second end 32 of the connection member 30 is connected to the first magnetic conductor 40 by crimping.

[0066] 7 to 10, Fig. 7 is a schematic diagram showing a push rod assembly 50 according to a first embodiment of the present disclosure. Fig. 8 is an exploded schematic diagram of Fig. 7. Fig. 9 is a partial enlarged view of portion X in Fig. 7. Fig. 10 is a cross-sectional view taken along plane BB in Fig. 7.

[0067] The push rod assembly 50 further includes a rod portion 51, a base 52, an elastic member 56, and a limit structure 57. The rod portion 51 is movably disposed through a third through-hole 131 of the yoke plate 13 (see FIG. 2). One end of the rod 51 is connected to the base 52, and the other end of the rod 51 is connected to a movable iron core 595 of the relay (see FIG. 2). One end of the elastic member 56 abuts against the base 52, and the other end of the elastic member 56 abuts against a movable assembly 53 consisting of a movable contact 54, a second magnetic conductor 591, and a third magnetic conductor 55. The elastic member 56 provides an elastic force such that the movable contact 54 tends to move toward the fixed contact lead-out end 20.

[0068] It is understood that the resilient member 56 may be, but is not limited to, a spring.

[0069] The limit structure 57 is connected to the base 52 and the movable assembly 53 and is used to limit the range of movement of the movable assembly 53 relative to the base 52. The limit structure 57 includes a limit hole 572 and a limit portion 571 that fit together. The limit hole 572 includes a first hole wall 573 and a second hole wall 574 that are relatively arranged along the movement direction D1 of the movable contact 54. The size of the second hole wall 574 (the length along the length direction D2 of the movable contact 54) is larger than the size of the first hole wall 573. The limit portion 571 is movably inserted between the first hole wall 573 and the second hole wall 574 of the limit hole 572. When the movable contact 54 is separated from the fixed contact pull-out end 20, the limit portion 571 is positioned on the first hole wall 573 of the limit hole 572.

[0070] In this embodiment, the base 52 is directly connected to the movable assembly 53 via the limit structure 57, which makes it easier to assemble the base 52 and the movable assembly 53. Furthermore, since there are no other members above the movable assembly 53, movement interference between the other members and the first magnetic conductive body 40 during the overtravel process is avoided.

[0071] It is understood that the limit hole 572 may be a through hole or a blind hole.

[0072] When the movable contact 54 is not in contact with the fixed contact pull-out end 20, the elastic member 56 causes the limit portion 571 to abut against the first hole wall 573 of the limit hole 572. When the movable contact 54 contacts the fixed contact pull-out end 20 and completes the overtravel process, the limit portion 571 moves from the first hole wall 573 to the second hole wall 574 of the limit hole 572. The size of the second hole wall 574 of the limit hole 572 is larger than the size of the first hole wall 573, so the limit hole 572 has a "larger one end and smaller other end" structure. During the overtravel process, the gap between the limit portion 571 and the hole wall of the limit hole 572 increases, preventing the limit portion 571 from rubbing against the hole wall of the limit hole 572 and getting caught when the movable contact 54 moves relative to the base 52. At the same time, the size of the first hole wall 573 of the limit hole 572 is relatively small, and does not affect the limit fitting between the limit portion 571 and the limit hole 572 in the initial state, preventing the movable contact 54 from swinging relative to the base 52.

[0073] In addition, in order to realize a limit between the movable contactor 54 and the base 52 in the initial state, the size of the first hole wall 573 of the limit hole 572 must match the shape of the limit portion 571 so that the limit portion 571 is limited by the hole wall of the limit hole 572 when the limit portion 571 is positioned on the first hole wall 573 of the limit hole 572.

[0074] 7 to 10, the size of the limit hole 572 gradually increases from the first hole wall 573 to the second hole wall 574 of the limit hole 572. During the overtravel process, as the limit portion 571 moves from the first hole wall 573 to the second hole wall 574 of the limit hole 572, the gap between the limit portion 571 and the hole wall of the limit hole 572 gradually increases.

[0075] Specifically, the limit hole 572 has a first hole wall 573 and a second hole wall 574 which are horizontally arranged relative to each other, and a first inclined wall 577 and a second inclined wall 578 which are horizontally arranged relative to each other, and one end of the first inclined wall 577 and the second inclined wall 578 is connected to both ends of the first hole wall 573, and the other ends of the first inclined wall 577 and the second inclined wall 578 are connected to both ends of the second hole wall 574.

[0076] In this embodiment, the shape of the limit hole 572 is generally an isosceles trapezoid, but is not limited to this. For example, the shape of the limit hole 572 may be a common trapezoid, i.e., a shape in which the slopes of the first inclined wall 577 and the second inclined wall 578 are not equal. In other embodiments, the shape of the limit hole 572 may be a triangle. Preferably, the triangle may be an isosceles triangle.

[0077] Of course, in other embodiments, the size of limit hole 572 does not have to gradually increase along the direction from first hole wall 573 to second hole wall 574 of limit hole 572. For example, the hole wall of limit hole 572 may include a constant diameter portion and an expanding diameter portion. For example, from first hole wall 573 to second hole wall 574, the hole wall of limit hole 572 may include, in order, an expanding diameter portion, a constant diameter portion, an expanding diameter portion, a constant diameter portion, etc.

[0078] As shown in FIG. 9, the limit portion 571 has a first arcuate surface 571a, which forms a limit with the first inclined wall 577 and the second inclined wall 578 of the limit hole 572 when the limit portion 571 is positioned on the first hole wall 573 of the limit hole 572.

[0079] In this embodiment, the outer wall of limit portion 571 is designed to include first arcuate surface 571a, thereby forming line contact between first arcuate surface 571a and first inclined wall 577 and second inclined wall 578 of limit hole 572, and this line contact reduces the frictional force between limit portion 571 and the hole wall of limit hole 572. Relative movement between limit portion 571 and limit hole 572 makes clogging less likely to occur.

[0080] A limit hole 572 is provided in the base 52, and a limit portion 571 is provided in the movable assembly 53. Of course, in other embodiments, the limit hole 572 may be provided in the movable assembly 53, and the limit portion 571 may be provided in the base 52.

[0081] As shown in FIGS. 7 to 10 , in this embodiment, a limit hole 572 is provided in the base 52, and a limit portion 571 is provided in the third magnetic conductor 55. The third magnetic conductor 55 includes a bottom portion 551, a first side portion 552, and a second side portion 553. The first side portion 552 and the second side portion 553 are connected to both ends of the bottom portion 551 along the width direction D3 of the movable contactor 54. The first side portion 552 and the second side portion 553 are respectively arranged on two opposing sides of the movable contactor 54 in the width direction D3. The first side portion 552 and the second side portion 553 are both provided with limit portions 571.

[0082] It can be seen that the moving direction D1, the length direction D2, and the width direction D3 are perpendicular to each other.

[0083] The base 52 includes a base 521, and a first limit member 522 and a second limit member 523 connected to the base 521 and arranged opposite each other, with the first side portion 552 arranged corresponding to the first limit member 522 and the second side portion 553 arranged corresponding to the second limit member 523. The first limit member 522 and the second limit member 523 both have limit holes 572.

[0084] A second arcuate surface 524 is formed on a side surface of the first limit member 522 facing the first side portion 552 and a side surface of the second limit member 523 facing the second side portion 553 .

[0085] In this embodiment, the side surface of the first limit member 522 facing the first side portion 552 and the side surface of the second limit member 523 facing the second side portion 553 are both designed to include the second arcuate surfaces 524. The two second arcuate surfaces 524 are in line contact with the first side portion 552 and the second side portion 553, respectively. This line contact reduces the friction between the first side portion 552 and the first limit member 522 and between the second side portion 553 and the second limit member 523. When the third magnetic conductor 55 moves relative to the base 52, clogging is less likely to occur. Furthermore, scrap that could contaminate the contact chamber 101 of the relay can be avoided.

[0086] The first side portion 552 and the second side portion 553 are disposed between the first limit member 522 and the second limit member 523. Limit portions 571 protrude from the side of the first side portion 552 remote from the second side portion 553 and from the side of the second side portion 553 remote from the first side portion 552.

[0087] For example, the limit portion 571 may be formed by punching out the side surface of the first side portion 552 / second side portion 553, so that the limit portion 571 forms a punched structure. The specific positions of the punched structures on the first side portion 552 / second side portion 553 can be flexibly adjusted depending on the structure.

[0088] In this embodiment, the two limit portions 571 protrude from the side of the first side portion 552 away from the second side portion 553 and from the side of the second side portion 553 away from the first side portion 552, respectively, so that the first side portion 552 and the second side portion 553 can fully contact the first limit member 522 and the second limit member 523, respectively, thereby ensuring the stability of the third magnetic conductor 55 and the base 52 when limiting and not affecting the magnetic conduction efficiency.

[0089] In one embodiment, the limit portion 571 may be in the shape of a long strip. When the limit portion 571 is positioned on the first hole wall 573 of the limit hole 572, a side surface of the long strip-shaped limit portion 571, which has a larger area, contacts the first hole wall 573 of the limit hole 572. By bringing the surface of the limit portion 571 with a larger area into contact with the hole wall of the limit hole 572, the movable contactor 54 is effectively prevented from swinging relative to the base 52 in the initial state, and the probability of the movable contactor 54 bouncing or flipping back is reduced.

[0090] 11, which is an exploded schematic view showing a push rod assembly 50 according to a second embodiment of the present disclosure. The similarities between the second embodiment and the first embodiment will not be described in detail, but the differences between the second embodiment and the first embodiment are as follows.

[0091] The limit portion 571 includes two convex structures that are spaced apart along the longitudinal direction D2 of the movable contactor 54. The design of the two convex structures effectively prevents the movable contactor 54 from swinging relative to the base 52 in the initial state, reducing the probability of the movable contactor 54 bouncing back or flipping back.

[0092] As shown in Fig. 12, Fig. 12 is an exploded schematic view showing a push rod assembly 50 according to a third embodiment of the present disclosure. The similarities between the third embodiment and the first embodiment will not be described in detail, but the differences between the third embodiment and the first embodiment are as follows.

[0093] The limit portion 571 is a rivet 579 , and the rivet 579 is crimped to the first side portion 552 / the second side portion 553 of the third magnetic conductor 55 .

[0094] 13 is an exploded schematic view showing a push rod assembly 50 according to a fourth embodiment of the present disclosure. Similarities between the fourth embodiment and the first embodiment will not be repeated here, but the fourth embodiment differs from the first embodiment in that the limit portion 571 is disposed at the bottom portion 551 of the third magnetic conductor 55.

[0095] Specifically, the third magnetic conductor 55 includes a bottom 551, a first side 552, and a second side 553. Limit portions 571 are provided to protrude from two opposing sides of the bottom 551 along the width direction D3 of the movable contactor 54. The first side 552 and the second side 553 are connected to both ends of the bottom 551 along the width direction D3 of the movable contactor 54. The first side 552 and the second side 553 are respectively arranged on two opposing sides of the movable contactor 54 in the width direction D3.

[0096] The base 52 comprises a base 521, and a first limit member 522 and a second limit member 523 connected to the base 521 and arranged opposite each other, and the first limit member 522 and the second limit member 523 each have a limit hole 572 formed therein.

[0097] As shown in Fig. 14, Fig. 14 is an exploded schematic view showing a push rod assembly 50 according to a fifth embodiment of the present disclosure. The similarities between the fifth embodiment and the first embodiment will not be described in detail, but the differences between the fifth embodiment and the first embodiment are as follows.

[0098] The base 52 includes a base 521, and a first limit member 522 and a second limit member 523 connected to the base 521 and arranged opposite to each other, with limit holes 572 formed in both the first limit member 522 and the second limit member 523. The movable assembly 53 further includes a fixed member 58 fixedly connected to the third magnetic conductor 55, with limit portions 571 provided on two opposite sides of the fixed member 58.

[0099] As shown in Fig. 15, Fig. 15 is an exploded schematic view showing a push rod assembly 50 according to a sixth embodiment of the present disclosure. Similarities between the sixth embodiment and the first embodiment will not be described in detail, but the differences between the sixth embodiment and the first embodiment are as follows.

[0100] The limit portions 571 protrude from two opposing side edges of the base 52 of the push rod assembly 50. The movable assembly 53 further includes a fixed member 58 fixedly connected to the third magnetic conductor 55, and the fixed member 58 is provided with a limit hole 572.

[0101] The fixing member 58 has an inverted U-shape, and the positions of the first hole wall 573 and the second hole wall 574 of the limit hole 572 provided in the fixing member 58 are opposite to those of the limit hole 572 in the above embodiment.

[0102] Specifically, as shown in FIG. 15, the first hole wall 573 of the limit hole 572 is located on the lower side, and the second hole wall 574 is located on the upper side, and the size of the second hole wall 574 is larger than the size of the first hole wall 573.

[0103] As shown in FIGS. 11 to 14, a first hole wall 573 of the limit hole 572 is located on the upper side, and a second hole wall 574 is located on the lower side.

[0104] 16 is a schematic diagram showing a state in which the first magnetic conductor 40 is fixedly connected to the fixed frame 70. In addition to the above-mentioned first magnetic conductor 40 being fixedly connected to the ceramic cover 11, the first magnetic conductor 40 can also be fixedly connected to the fixed frame 70 in a manner in which the first magnetic conductor 40 is fixedly disposed relative to the contact vessel 10.

[0105] Specifically, the relay further includes a fixed frame 70 disposed within the contact chamber 101 and fixedly connected to the yoke plate 13. The first magnetic conductor 40 is fixedly connected to the fixed frame 70. Here, the relative positional relationships among the first magnetic conductor 40, the second magnetic conductor 591, the third magnetic conductor 55, and the movable contact 54 can be referred to the above description, and will not be described again here.

[0106] It should be noted that the various examples / embodiments provided in the present disclosure can be combined with each other without causing any contradiction, and therefore, the description thereof will be omitted here.

[0107] In the embodiments of the present disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The terms "a pair" and "one" are used only to introduce technical features and should not be understood as limiting the specific quantity of technical features unless otherwise clearly defined. The term "plurality" refers to two or more than two unless otherwise clearly defined. Terms such as "attach," "contact," "connect," and "fixed" should be understood in a broad sense. For example, "connect" may mean a fixed connection, a detachable connection, or an integral connection, and "contact" may mean a direct connection or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure according to the specific circumstances.

[0108] In describing the embodiments of the present invention, the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "front," and "rear" are orientations or positional relationships based on the drawings, and are intended merely to facilitate the description and simplification of the embodiments of the present invention, and do not suggest or imply that the referenced devices or units must have a particular direction or be configured and operated in a particular orientation, and therefore cannot be understood as limitations on the embodiments of the present invention.

[0109] In the description herein, the terms "one embodiment," "some embodiments," "particular embodiment," etc., mean that the particular feature, structure, material, or characteristic described in connection with this embodiment or example is included in at least one embodiment or example of the present invention. In this specification, general references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0110] The above is only a preferred embodiment of the present invention, and is not used to limit the present invention. Those skilled in the art can make various modifications and changes to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A relay, a contact vessel having a contact chamber; a pair of fixed contact lead ends connected to the contact container; a first magnetic conductive body disposed within the contact chamber and fixedly disposed relative to the contact vessel; a push rod assembly including a movable contact, a second magnetic conductor, and a third magnetic conductor disposed within the contact chamber; The movable contact can be brought into contact with or separated from the pair of fixed contact lead-out ends, the second magnetic conductor and the third magnetic conductor are both fixedly connected to the movable contact, and are arranged on two opposite sides of the movable contact along the moving direction of the push rod assembly, the first magnetic conductor and the second magnetic conductor are both located on the side of the movable contact facing the fixed contact lead-out end, and the second magnetic conductor is arranged between the first magnetic conductor and the movable contact; The second magnetic conductor and the third magnetic conductor form a first magnetic conductive circuit, and the first magnetic conductor and the third magnetic conductor form a second magnetic conductive circuit. A relay characterized by:

2. The thickness of the first magnetic conductive body is greater than or equal to the thickness of the second magnetic conductive body.

2. A relay according to claim 1, characterized in that:

3. the contact vessel further comprises a pair of first and second through holes; the first through hole and the second through hole are both in communication with 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 inserted into the second through-hole and having a first end and a second end, the first end being connected to the contact container and the second end being connected to the first magnetic conductor.

2. A relay according to claim 1, characterized in that:

4. The contact vessel comprises: a yoke plate having a third through hole, the push rod assembly being movably inserted into the third through hole; an insulating cover having an upper wall and a side wall, one end of the side wall being surrounded by and connected to the upper wall, and the other end of the side wall being connected to the yoke plate; Here, the first through-hole and the second through-hole are opened in the upper wall, and a first end of the connecting member is connected to an outer wall surface of the upper wall.

4. A relay according to claim 3, characterized in that:

5. the insulating cover includes a ceramic cover and a flange member, the ceramic cover has 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 around the periphery of the first through hole, and a second metallized layer is provided on an outer wall surface of the upper wall around the periphery of 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.

5. A relay according to claim 4, characterized in that:

6. The upper wall and the side wall are an integral structure, or the upper wall and the side wall are separate structures.

5. A relay according to claim 4, characterized in that:

7. The first magnetic conductor is disposed at a distance from the inner wall surface of the upper wall.

5. A relay according to claim 4, characterized in that:

8. The second end of the connecting member is crimped, welded, or glued to the first magnetic conductor.

4. A relay according to claim 3, characterized in that:

9. The first magnetic conductor includes a plurality of stacked magnetic conductive sheets, and the plurality of magnetic conductive sheets are connected to a second end of the connecting member.

4. A relay according to claim 3, characterized in that:

10. The contact vessel comprises: a yoke plate having a third through hole, the push rod assembly being movably inserted into the third through hole; an insulating cover connected to the yoke plate, The relay further includes a fixed frame disposed within the contact chamber and fixedly connected to the yoke plate, and the first magnetic conductor is fixedly connected to the fixed frame.

2. A relay according to claim 1, characterized in that:

11. The push rod assembly With a base, an elastic member having one end abutting against the base and the other end abutting against a movable assembly consisting of the movable contact, the second magnetic conductor, and the third magnetic conductor, and providing an elastic force so that the movable contact tends to move toward the fixed contact pull-out end; a limit structure provided on the base and the movable assembly to limit a range of movement of the movable assembly relative to the base; the limit structure includes a limit hole and a limit portion to be fitted together, the limit hole includes a first hole wall and a second hole wall arranged opposite to each other along the moving direction of the movable contact, and the limit portion is movably inserted between the first hole wall and the second hole wall of the limit hole, When the movable contactor is separated from the fixed contact drawn-out end, the limit portion is positioned on the first hole wall of the limit hole. A relay according to any one of claims 1 to 10, characterized in that

12. The size of the second hole wall is larger than the size of the first hole wall.

12. A relay according to claim 11, characterized in that

13. The limit portion has a first arcuate surface, and the first arcuate surface forms a limit with the limit hole when the limit portion is positioned on the first hole wall of the limit hole.

12. A relay according to claim 11, characterized in that

14. The limiting portion is a rivet, and the rivet is crimped to the third magnetic conductor.

12. The relay according to claim 11 .

15. The movable assembly further includes a fixed member, the fixed member being fixedly connected to the third magnetic conductive body, the limit portion being provided on one of the fixed member and the base, and the limit hole being provided on the other of the fixed member and the base.

12. A relay according to claim 11, characterized in that

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