Relay

Abstract

The invention relates to a relay which comprises a coil assembly, a movable contact assembly and a guide assembly, the movable contact assembly is movably arranged on the coil assembly in a penetrating mode and can be driven by the coil assembly to move in the axial direction, and the guide assembly is arranged in a mounting hole and located on the coil assembly and the movable contact assembly in the radial direction defined by the central axis. A contact point and / or a contact line used for being in contact with the movable contact assembly are / is formed on the guide assembly, so that the contact between the guide assembly and the movable contact assembly is linear contact and / or point contact, coating of a Teflon material on the guide assembly is omitted, friction force between the guide assembly and the movable contact assembly is reduced, and the service life of the movable contact assembly is prolonged. The problems of motion jamming of the movable contact assembly and large contact resistance of the contact are solved, and the production and manufacturing cost of the relay can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic control devices, and particularly to a relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually applied to an automatic control circuit. Its principle is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays roles such as automatic regulation, safety protection, and circuit conversion in the circuit, and is widely used in fields such as new energy vehicle fields.

[0003] The epoxy high-voltage DC relay is a common type of relay. Its coil part includes a coil and an oil-free bearing for guiding. Usually, there is a layer of Teflon material on the inner surface of the oil-free bearing. When the moving iron core moves relative to the oil-free bearing by friction, the Teflon material plays a role in lubrication and reducing friction. However, if the bonding force of the Teflon material sintered with the oil-free bearing is poor, it will cause the surface of the oil-free bearing to easily peel or generate Teflon chips, resulting in problems such as jamming of the moving iron core movement and large contact resistance of the contacts, which is not conducive to the normal operation of the relay. Summary of the Invention

[0004] Based on this, it is necessary to provide a relay that can solve the above problems in view of the problems of jamming of the moving iron core movement and large contact resistance of the contacts in the existing relay.

[0005] According to one aspect of the present application, a relay is provided, including:

[0006] A coil assembly having an installation hole penetrating through opposite ends thereof in an axial direction defined along a central axis;

[0007] A moving contact assembly movably penetrating through the installation hole, and the moving contact assembly can move along the axial direction under the drive of the coil assembly;

[0008] A guiding assembly disposed in the installation hole and located between the coil assembly and the moving contact assembly in a radial direction defined by the central axis. A contact point and / or a contact line for contacting the moving contact assembly are formed on the guiding assembly, so that the contact between the guiding assembly and the moving contact assembly is line contact and / or point contact.

[0009] In one embodiment, the guiding assembly includes a coaxially arranged guiding sleeve and a guiding member. The guiding sleeve has a through hole penetrating through opposite ends thereof in the axial direction. The guiding member is disposed in the through hole and forms the contact point and / or the contact line, and the contact point and / or the contact line protrude relative to the hole wall of the through hole.

[0010] In one embodiment, a plurality of card slots are provided on the hole wall of the through hole and / or the side wall of the moving contact assembly, and are arranged at intervals along the axial direction; each of the card slots is arranged around the central axis; correspondingly, there are a plurality of guiding members, and a part of each guiding member is embedded in a corresponding one of the card slots, and the other part protrudes relative to the hole wall of the through hole to form the contact wire.

[0011] In one embodiment, the guiding member is a spring that spirally extends along the axial direction, and each turn of the spring protrudes relative to the hole wall of the through hole to form the contact wire.

[0012] In one embodiment, the spring includes a first part and a second part that are axially connected to each other, and both the first part and the second part respectively spirally extend along the axial direction, and the spiral pitch of the first part is smaller than the spiral pitch of the second part.

[0013] In one embodiment, the guiding member includes an upper end ring, a lower end ring and a middle ring, and opposite ends of the middle ring along its own axis are respectively connected to the upper end ring and the lower end ring; the inner wall of the middle ring has a plurality of ribs arranged at intervals along the circumferential direction or the axial direction of the middle ring, and each rib protrudes relative to the inner wall of the middle ring to form the contact wire.

[0014] In one embodiment, the guiding member includes an upper end ring, a lower end ring and a middle ring, and opposite ends of the middle ring along its own axis are respectively connected to the upper end ring and the lower end ring, and a plurality of through slots are provided on the side wall of the middle ring at intervals along the circumferential direction or the axial direction of the middle ring, so that a plurality of spring strips are formed on the side wall of the middle ring at intervals along the circumferential direction or the axial direction of the middle ring, and each spring strip forms the contact wire.

[0015] In one embodiment, the side wall of the middle ring is arc-shaped and curved towards the central axis, so that in the axial direction, a protrusion is formed in the middle of the middle ring itself, and the diameter of the protrusion is smaller than the diameter of the middle ring at its two end portions.

[0016] In one embodiment, the middle ring can undergo recoverable deformation under an external force, so that when the protrusion is abutted by the moving contact assembly, the side wall radian of the middle ring decreases, and when the protrusion is separated from the moving contact assembly, the side wall radian of the middle ring increases.

[0017] In one embodiment, in the direction from the upper end ring to the lower end ring, the diameter of the lower end ring gradually increases; correspondingly, the diameter of the part of the guide sleeve in contact with the lower end ring also gradually increases.

[0018] In the above relay, by forming contact points and / or contact lines for contacting the moving contact assembly on the guiding assembly, the contact between the guiding assembly and the moving contact assembly is point contact and / or line contact, thereby eliminating the need to coat the guiding assembly with Teflon material and reducing the contact area between the guiding assembly and the moving contact assembly. This not only reduces the friction between the guiding assembly and the moving contact assembly, solves the problems of jamming of the moving contact assembly during movement and large contact resistance of the contact points, but also can reduce the production and manufacturing cost of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a relay provided by an embodiment of the present application.

[0020] Figure 2 It is an exploded view of a partial structure of a relay provided by an embodiment of the present application.

[0021] Figure 3 It is a schematic diagram showing the guide member outside the guide sleeve in a relay provided by an embodiment of the present application Figure 1 .

[0022] Figure 4 It is a cross-sectional view showing the guide member installed in the guide sleeve in a relay provided by an embodiment of the present application Figure 1 .

[0023] Figure 5 It is a schematic diagram showing the guide member outside the guide sleeve in a relay provided by an embodiment of the present application Figure 2 .

[0024] Figure 6 It is a schematic structural diagram of the guide member of a relay provided by an embodiment of the present application Figure 1 .

[0025] Figure 7 It is a schematic diagram showing the guide member outside the guide sleeve in a relay provided by an embodiment of the present application Figure 3 .

[0026] Figure 8 It is a cross-sectional view showing the guide member installed in the guide sleeve in a relay provided by an embodiment of the present application Figure 2 .

[0027] Figure 9 It is a schematic structural diagram of the guide member of a relay provided by an embodiment of the present application Figure 2 .

[0028] Figure 10 isFigure 9 An enlarged schematic view of area A.

[0029] Figure 11 The structural schematic diagram of the guiding member of the relay provided by an embodiment of the present application Figure 3 .

[0030] Figure 12 The structural schematic diagram of the guiding member of the relay provided by an embodiment of the present application Figure 4 .

[0031] Explanation of reference numerals:

[0032] 10. Relay; 100. Cup body; 200. Coil assembly; 210. Coil holder; 211. Mounting hole; 220. Coil; 300. Static contact assembly; 301. Static contact; 400. Moving contact assembly; 410. Moving iron core; 420. Push rod; 430. Moving contact piece; 500. Guiding assembly; 510. Guide sleeve; 511. Through hole; 512. Card slot; 520. Guiding member; 521. First part; 522. Second part; 523. Upper end ring; 524. Lower end ring; 525. Middle ring; 526. Rib; 527. Through groove; 528. Spring strip; 60. Central axis. Detailed implementation manners

[0033] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0035] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plural" appears, "plural" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In this application, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0039] This application provides a relay, which is applied to an automatic control circuit and plays roles such as automatic regulation, safety protection, and circuit conversion in the circuit. For example, it can be used to connect a load power supply and a load, control the on-off of the circuit of the load power supply and the load, so as to play a role in protecting the load through circuit conversion and automatic regulation, and avoid the situation that the load is damaged due to excessive current.

[0040] Taking the high-voltage DC relay applied in an electric vehicle charging pile as an example, the structure of the relay provided in this application will be described. It can be understood that the relay provided in this application can be any type of relay used in other fields, not limited to the high-voltage DC relay applied in an electric vehicle charging pile, and there is no special limitation on this.

[0041] Referring to Figure 1 and Figure 2 , Figure 1 FIG. shows a cross-sectional view of the internal structure of the relay 10 in an embodiment of this application. Figure 2 FIG. shows an exploded view of a partial structure of the relay 10. The relay 10 provided in an embodiment of this application includes a cup body 100, a coil assembly 200 disposed inside the cup body 100, a static contact assembly 300, a moving contact assembly 400, and a guiding assembly 500. One end of the cup body 100 is open, and the coil assembly 200 is disposed at the bottom inside the cup body 100. It includes a coil bobbin 210 and a coil 220 wound around the coil bobbin 210. The coil bobbin 210 has a mounting hole 211 penetrating through opposite ends of itself in the axial direction defined along a central axis 60. The static contact assembly 300 is disposed above the coil assembly 200 along the above axial direction and closes the opening of the cup body 100. The moving contact assembly 400 is movably inserted through the mounting hole 211 to contact and separate from the static contact assembly 300, thereby realizing the on-off control of the circuit of the load power supply and the load.

[0042] Specifically, in some embodiments, as Figure 1 shown, the static contact assembly 300 has two static contact terminals 301. One of the static contact terminals 301 is used to connect the load power supply, and the other static contact terminal 301 is used to connect the load (such as an electric vehicle). The moving contact assembly 400 includes a moving iron core 410, a push rod 420, and a moving contact piece 430. The moving iron core 410 is sleeved on the push rod 420, and the moving contact piece 430 is disposed at the end of the push rod 420. When the coil 220 is energized, the moving iron core 410 can drive the push rod 420 and the moving contact piece 430 to move relative to the static contact terminals 301 along the above axial direction under the action of the magnetic force generated by the energization of the coil 220, so as to be able to contact or separate from one end of the two static contact terminals 301 extending into the insulating cover. When the moving contact piece 430 contacts the two static contact terminals 301, the circuits of the two static contact terminals 301 are conducted, so that the circuits of the load power supply and the load (such as an electric vehicle) are conducted. When the moving contact piece 430 separates from the two static contact terminals 301, the circuits of the two static contact terminals 301 are disconnected, so that the circuits of the load power supply and the load are disconnected.

[0043] The guiding component 500 is disposed in the mounting hole 211 formed in the bobbin 210, and is located between the bobbin 210 of the coil assembly 200 and the moving contact assembly 400 in the radial direction defined by the central axis 60. Its function is to provide guidance for the movement of the moving contact assembly 400 when the moving contact assembly 400 moves relative to the coil assembly 200, so that the moving contact assembly 400 can only move along the axial direction (the X direction in the figure, hereinafter referred to as the X direction) defined by the central axis 60. In one embodiment, the guiding component 500 includes a guide sleeve 510 and a lubricating layer. The guide sleeve 510 has a through hole 511 penetrating through opposite ends thereof in the X direction, and the lubricating layer is coated on the hole wall of the through hole 511 to reduce the frictional force between the moving contact assembly 400 and the guide sleeve 510. Exemplarily, the guide sleeve 510 is an oil-free bearing, and the lubricating layer is a layer of Teflon material, and the Teflon material is attached to the hole wall of the through hole 511 by sintering.

[0044] However, as described in the background art, if the bonding force between the Teflon material and the oil-free bearing during sintering is poor, the surface of the oil-free bearing is likely to peel or generate Teflon chips, resulting in problems such as jamming of the moving iron core 410 during movement and large contact resistance of the contact point, which is not conducive to the normal operation of the relay 10.

[0045] Therefore, to solve this problem, the applicant thought that the contact area between the guiding component 500 and the moving contact assembly 400 can be reduced. For example, contact points and / or contact lines for contacting the moving contact assembly 400 are formed on the guiding component 500 to achieve the purpose of reducing the frictional force between the guiding component 500 and the moving contact assembly 400, thereby solving the problems of jamming of the moving iron core 410 during movement and large contact resistance of the contact point.

[0046] Specifically, referring to Figure 2 , in some embodiments of the present application, the guiding component 500 does not have a lubricating layer. Instead, the guiding component 500 includes a coaxially arranged guide sleeve 510 and a guiding member 520. The guide sleeve 510 can still be an oil-free bearing, and the guiding member 520 is disposed in the through hole 511 of the guide sleeve 510 and forms contact points and / or contact lines, and the contact points and / or contact lines protrude from the hole wall of the through hole 511.

[0047] More specifically, for the structure of the guiding member 520, there can be various alternative embodiments, and some specific embodiments will be introduced below.

[0048] Referring to Figure 3 and Figure 4In one embodiment, the through hole 511 of the guide sleeve 510 is provided with a plurality of slots 512 spaced apart along the X direction, each slot 512 surrounds the central axis 60, and the guide members 520 are provided with a plurality of slots 512 correspondingly, each guide member 520 is annular, and a portion of each guide member 520 is embedded in a corresponding slot 512, and the other portion is protruded relative to the hole wall of the through hole 511 to form an annular contact line. It is understandable that the slots 512 may also be provided on the outer surface of the moving iron core 410 in the moving contact assembly 400, and a portion of each guide member 520 is embedded in a corresponding slot 512, and the other portion is protruded relative to the outer surface of the moving iron core 410.

[0049] Alternatively, the wall of the through hole 511 of the guide sleeve 510 is provided with a plurality of discretely distributed slots 512, each guide member 520 is in a block shape, and all guide members 520 are distributed in each slot 512, so as to form a plurality of contact points. Of course, the outer surface of the moving iron core 410 may also be provided with a plurality of discretely distributed slots 512, and all guide members 520 in a block shape are distributed in each slot 512.

[0050] Optionally, see Figure 5 and Figure 6 In another embodiment, the guide member 520 is a spring extending helically in the X direction, and is preferably installed in the through hole 511 of the guide sleeve 510 by interference fitting, and each coil of the spring is protruded relative to the hole wall of the through hole 511 to form a contact line. Preferably, as Figure 6 As shown, the spiral pitch of the spring is not a spiral pitch of only one value, but has at least two spiral pitches of different values. For example, in the embodiment in the figure, the spring includes a first part 521 and a second part 522 connected to each other along the X direction, the first part 521 and the second part 522 are respectively extended in the X direction, and the spiral pitch of the first part 521 is smaller than the spiral pitch of the second part 522. In the embodiment in the figure, the first part 521 has three sections, which are respectively located at the bottom, the top and the middle of the guide member 520, and the second part 522 has two sections, and each section of the second part 522 is located between two adjacent sections of the first part 521. It can be understood that if the initial pitch of the spring is considered to be larger, the first part 521 is formed by compressing some parts of the spring along the X direction to reduce the pitch, and if the initial pitch of the spring is considered to be smaller, the second part 522 is formed by stretching some parts of the spring along the X direction to increase the pitch.

[0051] The advantage of designing the guiding member 520 as described above is that the pitch of the first part 521 is smaller, so the first part 521 has higher structural strength. Since the guiding member 520 needs to be press-fitted into the guiding sleeve 510, the higher structural strength of the first part 521 of the guiding member 520 can improve the connection reliability between the guiding member 520 and the guiding sleeve 510, and enhance the safety and stability of the relay 10 during use, thereby extending the service life of the relay 10.

[0052] It can be understood that the guiding member 520 may further include more parts with different helix pitches, which can be configured according to needs.

[0053] In some other alternative embodiments, refer to Figure 7 and Figure 8 , the guiding member 520 has a cylindrical structure. Specifically, as Figure 9 shown, the guiding member 520 includes an upper end ring 523, a lower end ring 524, and an intermediate ring 525. The opposite ends of the intermediate ring 525 along its own axial direction (i.e., along the X direction) are respectively connected to the upper end ring 523 and the lower end ring 524.

[0054] To form a contact line or contact points, as Figure 9 and Figure 10 shown, the side wall of the intermediate ring 525 has a plurality of ribs 526 arranged at intervals along the circumferential direction or the axial direction of the intermediate ring 525. Each rib 526 protrudes relative to the inner wall of the intermediate ring 525 to form a contact line. For the extending direction of the rib 526, the rib 526 can extend along the axial direction of the intermediate ring 525, or along the circumference of the intermediate ring 525, or as Figure 9 shown, extend obliquely relative to the axial direction of the intermediate ring 525. Or the rib 526 can be in an irregular shape, which is not limited herein. Of course, it is also possible that the entire inner wall of the guiding member 520 is provided with ribs 526, and it is not limited that only the inner wall of the intermediate ring 525 is provided with ribs 526.

[0055] As an equivalent alternative embodiment, as Figure 11 and Figure 12 shown, the side wall of the intermediate ring 525 can also be provided with a plurality of through grooves 527 arranged at intervals along the circumferential direction or the axial direction of the intermediate ring 525, so that the side wall of the intermediate ring 525 forms a plurality of spring strips 528 arranged at intervals along the circumferential direction or the axial direction of the intermediate ring 525. Each spring strip 528 forms a contact line, thereby also being able to reduce the contact area between the moving contact assembly 400 and the guiding assembly 500. Similarly, as Figure 11 shown, the spring strip 528 can extend along the axial direction of the intermediate ring 525, or along the circumference of the intermediate ring 525, or as Figure 12As shown, the spring strip 528 extends axially and obliquely relative to the middle ring 525, or it can also have an irregular shape, which is not limited here.

[0056] For the above embodiments in which the rib 526 is provided on the guide member 520 or the spring strip 528 is formed, preferably, as Figure 9 , Figure 10 and Figure 12 shown, the guide member 520 has a structure that is thinner in the middle and thicker at both ends in its own axial direction. Specifically, the side wall of the middle ring 525 is curved in an arc shape towards the central axis 60, so that in the X direction, a protrusion is formed in the middle of the middle ring 525, and the diameter of the protrusion is smaller than the diameter of the middle ring 525 at its two ends. In this way, the moving iron core 410 can only contact the part of the rib 526 or the spring strip 528 located on the protrusion, thereby further reducing the contact area between the moving iron core 410 and the guide member 520.

[0057] However, it should be noted that due to the machining accuracy of the guide member 520, it is difficult to ensure that each rib 526 or spring strip 528 on the middle ring 525 contacts the moving iron core 410. Therefore, as an improvement to the above embodiments, combined with Figure 8 shown, the diameter enclosed by the protrusions of the middle ring 525 is slightly smaller than the diameter of the moving iron core 410, and the middle ring 525 can be made to be able to undergo recoverable deformation under external force by reducing its thickness or selecting a deformable material, etc., so that when the protrusion is abutted by the moving iron core 410, the side wall radian of the middle ring 525 decreases; and when the protrusion is separated from the moving iron core 410, the side wall radian of the middle ring 525 increases.

[0058] By such a design, the guide member 520 can not only play a guiding role, but also when the moving iron core 410 passes through the guide member 520, the moving iron core 410 presses on the rib 526 or the spring strip 528, slightly flattening the protrusion of the middle ring 525 in a direction away from the central axis 60, but the middle ring 525 still maintains a certain inward arc-shaped bending state towards the central axis 60, so that it can be ensured that each rib 526 or spring strip 528 on the guide member 520 contacts the moving iron core 410. This not only reduces the frictional force between the moving iron core 410 and the guide member 520 when the moving iron core 410 moves in the X direction, but also solves the problem that due to insufficient machining accuracy, it cannot be ensured that each rib 526 or spring strip 528 contacts the moving iron core 410.

[0059] Furthermore, as Figure 11 and Figure 12As shown, in a better embodiment, the lower end ring 524 can also be in an inverted conical shape, that is, in the direction from the upper end ring 523 to the lower end ring 524, the diameter of the lower end ring 524 gradually increases; correspondingly, in this direction, the diameter of the part of the guide sleeve 510 in contact with the lower end ring 524 also gradually increases. In this way, when the moving iron core 410 moves upward along the X direction, the lower end ring 524 can form a limiting fit with the guide sleeve 510 by relying on the inverted conical structure, so as to prevent the guide member 520 from being driven by the moving iron core 410 and shifting, and when the moving iron core 410 moves downward along the X direction, the guide member 520 can be more firmly supported on the bottom wall of the cup body 100.

[0060] It should be noted that the guide assembly 500 can also be an integrally formed structure, as long as it can ensure line contact or point contact with the moving contact assembly 400.

[0061] It can be seen that for the relay 10 provided in this application, by changing the surface contact between the guide assembly 500 and the moving contact assembly 400 to line contact or point contact, and canceling the lubricating layer of the Teflon material, not only the friction between the guide assembly 500 and the moving contact assembly 400 is reduced, but also the phenomenon of the Teflon material peeling or falling off to generate Teflon chips will not occur, effectively solving the problems of jamming during the movement of the moving iron core 410 and large contact resistance of the contacts.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0063] The above-described embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. A relay, characterized in that: include: The coil assembly has mounting holes penetrating through opposite ends of the coil assembly in an axial direction defined along a central axis; A movable contact assembly is movably arranged in the mounting hole, and the movable contact assembly can move along the axial direction under the drive of the coil assembly; A guide assembly is disposed in the mounting hole and is located between the coil assembly and the moving contact assembly in the radial direction defined by the central axis. A contact point and / or contact line for contacting the moving contact assembly is formed on the guide assembly so that the contact between the guide assembly and the moving contact assembly is line contact and / or point contact.

2. The relay according to claim 1, characterized in that: The guide assembly includes a coaxially arranged guide sleeve and a guide member, the guide sleeve has a through hole penetrating its opposite ends along the axial direction, the guide member is arranged in the through hole and forms the contact point and / or the contact line, and the contact point and / or the contact line are protruding relative to the hole wall of the through hole.

3. The relay according to claim 2, characterized in that: The hole wall of the through hole or the side wall of the dynamic contact component is provided with a plurality of slots arranged at intervals along the axial direction, and each of the slots is arranged around the central axis; the guide members are correspondingly provided with a plurality of slots, a portion of each of the guide members is embedded in a corresponding slot, and the other portion protrudes relative to the hole wall of the through hole to form the contact line.

4. The relay according to claim 2, characterized in that: The guide member is a spring that spirally extends along the axial direction, and each coil of the spring is protruded relative to the hole wall of the through hole to form the contact line.

5. The relay according to claim 4, characterized in that: The spring comprises a first portion and a second portion connected to each other along the axial direction, the first portion and the second portion both extend helically along the axial direction, and a helical pitch of the first portion is smaller than a helical pitch of the second portion.

6. The relay according to claim 2, characterized in that: The guide member includes an upper end ring, a lower end ring and an intermediate ring, and the intermediate ring is respectively connected to the upper end ring and the lower end ring at two opposite ends along its own axial direction; the inner wall of the intermediate ring has a plurality of ribs arranged at intervals along the circumferential direction of the intermediate ring or along the axial direction of the intermediate ring, and each of the ribs protrudes relative to the inner wall of the intermediate ring to form the contact line.

7. The relay according to claim 2, characterized in that: The guide member includes an upper end ring, a lower end ring and an intermediate ring. The opposite ends of the intermediate ring along its own axial direction are respectively connected to the upper end ring and the lower end ring. The side wall of the intermediate ring is provided with a plurality of through grooves arranged at intervals along the circumferential direction of the intermediate ring or along the axial direction of the intermediate ring, so that the side wall of the intermediate ring is formed with a plurality of spring bars arranged at intervals along the circumferential direction of the intermediate ring or along the axial direction of the intermediate ring, and each of the spring bars forms the contact line.

8. The relay according to claim 6 or 7, characterized in that: The side wall of the intermediate ring is curved in an arc shape toward the central axis, so that in the axial direction, a protrusion is formed in the middle of the intermediate ring, and the diameter of the protrusion is smaller than the diameter of the intermediate ring at both ends.

9. The relay according to claim 8, characterized in that: The intermediate ring can be deformed restorably under the action of external force, so that when the protrusion is abutted by the dynamic contact component, the curvature of the side wall of the intermediate ring decreases, and when the protrusion is separated from the dynamic contact component, the curvature of the side wall of the intermediate ring increases.

10. The relay according to claim 8, characterized in that: In the direction from the upper end ring to the lower end ring, the diameter of the lower end ring gradually increases; correspondingly, the diameter of the portion of the guide sleeve that contacts the lower end ring also gradually increases.

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