Magnetic circuit portion of relay, and relay

Abstract

The present application relates to a magnetic circuit portion (30) of a relay (100), and a relay (100). The magnetic circuit portion (30) of a relay (100) comprises a yoke assembly (31), a metal shell (34), and a movable iron core (32); the yoke assembly (31) is provided with a through hole (31c) for allowing a push rod (22) to pass through; the metal shell (34) is arranged in a space enclosed by the yoke assembly (31); the metal shell (34) is arranged around the axial direction of the push rod (22); the metal shell (34) comprises a non-magnetic conductive portion (341) and a magnetic conductive portion (342); the magnetic conductive portion (342) is connected to the yoke assembly (31) by means of the non-magnetic conductive portion (341); the movable iron core (32) is used for driving the push rod (22) to move relative to the yoke assembly (31) in the axial direction; at least part of the structure of the movable iron core (32) is located in the metal shell (34); and the magnetic conductive portion (342) can conduct magnetic lines of force between the yoke assembly (31) and the movable iron core (32).

Description

The magnetic circuit of the relay and the relay itself

[0001] This application claims priority to Chinese patent application filed on January 17, 2025, with application number 202520119170.5 and entitled "Magnetic Circuit Part of a Relay and a Relay", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of relay technology, and in particular to the magnetic circuit part of a relay and the relay itself. Background Technology

[0003] As an electronic control device, a relay has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits, essentially acting as an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays roles in automatic adjustment, safety protection, and circuit switching. High-voltage DC relays are relays capable of handling high power. Even under harsh conditions such as high voltage and high current, they possess unparalleled reliability and long service life compared to conventional relays, and are widely used in various fields, such as the new energy vehicle industry.

[0004] In related technologies, a metal shell is usually used to guide the movement of the moving iron core in order to stabilize the movement of the moving iron core.

[0005] However, if the entire structure of the metal shell is made of magnetically conductive material, the magnetic lines of force introduced from one end of the metal shell by the yoke assembly will be transmitted back to the yoke assembly from the other end of the metal shell, thereby dispersing the magnetic lines of force conducted to the moving iron core, and thus weakening the electromagnetic attraction of the moving iron core. If the entire structure of the metal shell is not made of magnetically conductive material, the wall thickness of the metal shell at the position corresponding to the moving iron core will increase the magnetic gap when conducting magnetic lines of force to the moving iron core, which is not conducive to the magnetization of the moving iron core, resulting in insufficient power of the moving iron core and requiring the configuration of more coils or an increase in the pull-in voltage. Summary of the Invention

[0006] According to various embodiments of this application, a magnetic circuit portion of a relay and a relay are provided.

[0007] On one hand, this application provides a magnetic circuit portion of a relay, the magnetic circuit portion including a yoke assembly, a metal shell, and a moving iron core. The yoke assembly has a through hole for a push rod to pass through. The metal shell is disposed within the space enclosed by the yoke assembly, and the metal shell is arranged axially around the push rod. The metal shell includes a magnetically conductive part and a non-magnetically conductive part. The magnetically conductive part is connected to the yoke assembly through the non-magnetically conductive part. The moving iron core is used to drive the push rod to move axially relative to the yoke assembly; at least a portion of the structure of the moving iron core is located within the metal shell, and the magnetically conductive part is capable of transmitting magnetic lines of force between the yoke assembly and the moving iron core.

[0008] In the magnetic circuit portion of the aforementioned relay, the metal casing includes a magnetically conductive part and a non-magnetically conductive part. Since at least a portion of the structure of the moving iron core is located within the metal casing, the magnetically conductive part can conduct magnetic lines of force between the yoke assembly and the moving iron core. Therefore, the problem of increased magnetic gap when conducting magnetic lines of force to the moving iron core when using a non-magnetically conductive metal casing, as seen in related technologies, is not present. This improves the electromagnetic power of the moving iron core, thus eliminating the need for a coil with more turns or an increased pull-in voltage to obtain sufficiently large electromagnetic power. Therefore, the solution in this application achieves both miniaturization of the relay and improved electromagnetic power of the moving iron core.

[0009] In one embodiment, the magnetic circuit portion further includes a magnetically conductive cylinder located within the space enclosed by the yoke assembly. The magnetically conductive cylinder is fitted over the metal shell and can conduct magnetic lines of force between the yoke assembly and the magnetically conductive portion. In this embodiment, the magnetically conductive cylinder not only conducts the magnetic lines of force from the yoke assembly to the magnetically conductive portion, but also, due to its cylindrical shape, converges the magnetic lines of force after they are conducted to it. This convergence of the magnetic lines of force around the magnetically conductive portion facilitates their transmission to the moving iron core via the magnetically conductive portion, enhancing the magnetization effect on the moving iron core and strengthening its electromagnetic power.

[0010] In one embodiment, the yoke assembly includes a first wall and a second wall disposed opposite to each other, the perforation is disposed on the first wall, the second wall is provided with an insertion hole, and the end of the magnetic cylinder away from the first wall is inserted into the insertion hole, the magnetic cylinder and the hole wall of the insertion hole are magnetically engaged.

[0011] In one embodiment, the yoke assembly includes a first wall and a second wall disposed opposite to each other. The perforation is disposed on the first wall, and the magnetically conductive part is connected to the first wall through the non-magnetically conductive part. Magnetic lines of force can be conducted between the magnetically conductive part and the second wall. In this embodiment, the non-magnetically conductive part is connected between the magnetically conductive part and the first wall to isolate magnetic conduction between the magnetically conductive part and the first wall. Therefore, the magnetic lines of force conducted from the second wall to the magnetically conductive part will not be directly conducted to the first wall through the magnetically conductive part, that is, the magnetic lines of force from the second wall are prevented from being directly conducted to the first wall through the metal shell.

[0012] In one embodiment, the magnetic circuit portion further includes a stationary iron core connected to the first wall; wherein the stationary iron core is in contact with or spaced apart from the inner wall of the non-magnetic portion. In this embodiment, when the two are in contact, the space enclosed by the non-magnetic portion can be fully utilized to accommodate the stationary iron core, thereby increasing its cross-sectional area. Since a larger magnetic circuit cross-sectional area results in a lower pull-in voltage, this structural arrangement allows the stationary iron core to provide a sufficiently large pull-in area to engage with the moving iron core, thus reducing the pull-in voltage and consequently lowering the relay's power consumption. When the two are spaced apart, the gap between the stationary iron core and the non-magnetic portion provides a certain assembly allowance, reducing the difficulty of assembling the metal casing and the stationary iron core to the yoke assembly.

[0013] In one embodiment, the magnetic circuit portion further includes a stationary iron core connected to the magnetically conductive portion and / or the second wall; wherein magnetic lines of force can be conducted between the stationary iron core and the magnetically conductive portion.

[0014] In one embodiment, a magnetically conductive gap exists between the magnetically conductive part and the moving iron core, and the moving iron core is in clearance fit with the non-magnetically conductive part. The gap between the moving iron core and the non-magnetically conductive part is smaller than the gap between the moving iron core and the magnetically conductive part. In this embodiment, the presence of the magnetically conductive gap ensures that the magnetically conductive part can transmit magnetic lines of force to the moving iron core. Furthermore, the gap prevents contact between the magnetically conductive part and the moving iron core, thus preventing frictional resistance during the movement of the moving iron core and improving the smoothness of its movement.

[0015] In one embodiment, the outer wall of the moving iron core is provided with a magnetic shielding layer, which at least covers the surface of the moving iron core overlapping the magnetic conductive part. With this structural arrangement, on the one hand, the magnetic shielding layer maintains the gap between the moving iron core and the inner wall of the magnetic conductive part, preventing them from contacting each other. Consequently, the magnetic conductive part does not exert an axial attraction perpendicular to the push rod on the moving iron core. That is, this structural arrangement reduces the lateral attraction between the magnetic conductive part and the moving iron core.

[0016] In one embodiment, the magnetic shielding layer comprises at least one of a Teflon coating, a non-magnetic stainless steel coating, an Ag coating, or a Cu coating. This magnetic shielding layer has good wear resistance and excellent sliding effect, reducing resistance during the movement of the moving iron core.

[0017] In one embodiment, a portion of the magnetic shielding layer is in contact with the inner wall of the magnetically conductive portion. With this structural arrangement, the magnetically conductive portion can guide the movement of the moving iron core, thereby further enhancing the stability of the moving iron core's movement.

[0018] In one embodiment, the diameter of the non-magnetic portion is larger than the diameter of the magnetic portion. The non-magnetic portion has an inwardly folded edge at one end near the magnetic portion, and the magnetic portion has an overlapping edge at one end near the non-magnetic portion. The non-magnetic portion and the magnetic portion are coaxially arranged, and the inwardly folded edge is connected to the overlapping edge. In this embodiment, on the one hand, the inwardly folded edge and the overlapping edge connect the non-magnetic portion and the magnetic portion, thereby improving the overall structural stability of the metal shell. On the other hand, this structural arrangement helps to keep the non-magnetic portion away from the moving iron core, preventing them from contacting each other and reducing friction, thus reducing the movement resistance of the moving iron core.

[0019] In one embodiment, the moving iron core includes a core body and a flange. The flange surrounds the periphery of the core body and is housed within the non-magnetic portion. The magnetic shielding layer is disposed on the periphery of the core body. In this embodiment, the flange increases the attraction area between the moving and stationary iron cores, thereby reducing the attraction voltage. The magnetic shielding layer on the periphery of the core body maintains a gap between the core body and the inner wall of the magnetically conductive portion, reducing lateral attraction between the core body and the magnetically conductive portion, and consequently reducing the resistance when the moving iron core moves relative to the magnetically conductive portion along the axial direction of the push rod.

[0020] In one embodiment, the outer wall of the flange is spaced apart from the inner wall of the non-magnetic part to avoid friction between the flange and the inner wall of the non-magnetic part, thereby helping to reduce the movement resistance of the moving iron core.

[0021] In one embodiment, the outer wall of the flange contacts the inner wall of the non-magnetic portion. Thus, the non-magnetic portion can guide the flange, enhancing the motion stability of the moving iron core.

[0022] In one embodiment, the moving iron core includes a core body and a flange. The flange surrounds the periphery of the core body and is housed within the non-magnetic portion. The outer wall of the flange contacts the inner wall of the non-magnetic portion, and a magnetic gap exists between the core body and the inner wall of the magnetic portion. Because the outer wall of the flange contacts the inner wall of the non-magnetic portion, the space enclosed by the non-magnetic portion can be fully utilized to accommodate the stationary iron core, thereby increasing its cross-sectional area. Since a larger magnetic circuit cross-sectional area results in a lower pull-in voltage, this structural arrangement allows the stationary iron core to provide a sufficiently large pull-in area to engage with the moving iron core, thus reducing the pull-in voltage and consequently lowering the relay's power consumption. A magnetic gap exists between the magnetic portion and the core body of the moving iron core. The presence of the magnetic gap ensures that the magnetic part can transmit magnetic lines of force to the moving iron core. On the other hand, the presence of the magnetic gap also ensures that there is no contact between the magnetic part and the moving iron core. Therefore, the moving iron core will not generate frictional resistance with the magnetic part during its movement, thus improving the smoothness of the moving iron core's movement.

[0023] In one embodiment, the metal shell is a bottomed cylindrical structure, and at least a portion of the bottom of the metal shell is made of a magnetically conductive material to form the magnetically conductive part.

[0024] On the other hand, this application provides a relay, including the magnetic circuit portion of the relay as described above. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of the relay structure in one embodiment.

[0027] Figure 2 is an exploded schematic diagram of the relay shown in Figure 1.

[0028] Figure 3 is a cross-sectional schematic diagram of a portion of the relay structure in one embodiment.

[0029] Figure 4 is a magnified view of the circled part of the structure in Figure 3.

[0030] Figure 5 is a cross-sectional schematic diagram of a portion of the relay structure in another embodiment.

[0031] Figure 6 is a magnified view of the circled part of the structure in Figure 5.

[0032] Figure 7 is a cross-sectional schematic diagram of a portion of the relay structure in another embodiment.

[0033] Figure 8 is a magnified view of the structure of the circled part in Figure 7.

[0034] Figure 9 is a cross-sectional schematic diagram of a portion of the relay structure in another embodiment.

[0035] Figure 10 is a magnified view of the structure of the circled part in Figure 9.

[0036] Figure 11 is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment.

[0037] Figure 12 is a magnified view of the structure of the circled part in Figure 11.

[0038] Figure 13 is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment.

[0039] Figure 14 is a magnified view of the circled part of the structure in Figure 13.

[0040] Figure 15 is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment of this application.

[0041] Figure 16 is a magnified view of the circled part of the structure in Figure 15.

[0042] Figure 17 is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment of this application.

[0043] Figure 18 is a magnified view of the structure of the circled part in Figure 17.

[0044] Figure 19 is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment of this application.

[0045] Reference numerals: 100, Relay; 10, Contact part; 11, Stationary contact; 12, Moving contact; 20, Pushing mechanism; 21, Pushing base; 22, Pushing rod; 30, Magnetic circuit part; 31, Yoke assembly; 31a, First wall; 31b, Second wall; 31c, Perforation; 31d, Insertion hole; 311, Yoke plate; 312, U-shaped yoke; 32, Moving iron core; 321, Iron core body; 322, Flange; 32a, Magnetic shielding layer; 33, Stationary iron core; 34, Metal shell; 341, Non-magnetic part; 3411, Inner folded edge; 3412, Outer folded edge; 342, Magnetic part; 3421, Overlapping edge; 35, Return spring; 36, Magnetic cylinder; 37, Stationary magnetic component; 40, Coil; 50, Coil frame; 51, Mounting hole; 60, Insulating cover. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, where 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 number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "attached to" another element, it can be directly on the other element or there may 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 present. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0052] Referring to Figures 1 and 2, this application provides a relay 100 that can be applied in automatic control circuits.

[0053] The relay 100 includes a contact portion 10, an actuation mechanism 20, and a magnetic circuit portion 30.

[0054] The contact portion 10 includes a stationary contact 11 and a moving contact 12. There can be two stationary contacts 11, with each end of the moving contact 12 corresponding to one of the two stationary contacts 11. The moving contact 12 can move closer to or further away from the stationary contacts 11 under the drive of the pushing mechanism 20, so that when the moving contact 12 is in contact with the stationary contacts 11, they are electrically connected, and when they are separated, they are electrically disconnected.

[0055] The pushing mechanism 20 includes a pushing seat 21 and a pushing rod 22 connected to each other. The moving contact 12 is disposed on the pushing seat 21. The pushing rod 22 is used to move the pushing seat 21 closer to or away from the stationary contact 11 when it moves, so that the moving contact 12 on the pushing seat 21 comes into contact with or separates from the stationary contact 11, thereby achieving the purpose of electrically connecting or disconnecting the moving contact 12 from the stationary contact 11, so as to meet the need to connect or disconnect the automatic control circuit connected to the relay 100.

[0056] As shown in Figures 2 and 3, the magnetic circuit section 30 includes a yoke assembly 31, a moving iron core 32, and a stationary iron core 33.

[0057] The yoke assembly 31 can enclose a certain space to accommodate other structural components. For example, both the moving iron core 32 and the stationary iron core 33 are located within the space enclosed by the yoke assembly 31. The yoke assembly 31 has a through hole 31c for inserting a push rod 22. Specifically, one end of the push rod 22 is connected to the push seat 21, and the other end passes through the through hole 31c into the space enclosed by the yoke assembly 31, so that the push rod 22 can connect with the moving iron core 32 located within the yoke assembly 31.

[0058] Continuing with Figures 2 and 3, for ease of description, the sidewall of the yoke assembly 31 with the through hole 31c is referred to as the "first wall 31a," and correspondingly, the sidewall of the yoke assembly 31 opposite to the first wall 31a is referred to as the "second wall 31b." That is, the yoke assembly 31 includes the first wall 31a and the second wall 31b opposite to each other, and the through hole 31c is located on the first wall 31a.

[0059] Taking the relay 100 shown in Figures 2 and 3 as an example, the yoke assembly 31 includes a yoke plate 311 and a U-shaped yoke 312. A through hole 31c is provided on the yoke plate 311, so the yoke plate 311 can be called the "first wall 31a" of the yoke assembly 31, and the side wall of the U-shaped yoke 312 opposite to the yoke plate 311 can be called the "second wall 31b" of the yoke assembly 31.

[0060] A yoke plate 311 is connected to both ends of a U-shaped yoke 312, and a through hole 31c is provided in the yoke plate 311. A pusher seat 21 is located on the side of the yoke plate 311 facing away from the moving iron core 32. The end of the push rod 22 away from the moving contact piece 12 passes through the yoke plate 311 and is connected to the moving iron core 32. In this embodiment, the push rod 22 passes through the through hole 31c of the yoke plate 311. Since both ends of the push rod 22 are connected to the pusher seat 21 and the moving iron core 32 respectively, the pusher seat 21 and the moving iron core 32 are located on both sides of the yoke plate 311.

[0061] It should be noted that the through hole 31c is not limited to being provided on the yoke plate 311. For example, the through hole 31c may not be provided on the yoke plate 311, but may be provided on the U-shaped yoke 312. In this case, the side wall of the U-shaped yoke 312 with the through hole 31c can be positioned facing the side where the stationary contact 11 is located. Since the yoke plate 311 connects the two ends of the U-shaped yoke 312, the yoke plate 311 is positioned on the side of the U-shaped yoke 312 facing away from the stationary contact 11. In this embodiment, the space enclosed by the yoke plate 311 and the U-shaped yoke 312 can still meet the assembly and functional requirements of other structures of the relay 100.

[0062] The structure of the yoke assembly 31 can be implemented in various ways, and is not limited to the above-mentioned yoke assembly 31, which includes yoke plate 311 and U-shaped yoke 312.

[0063] For example, in some embodiments, the yoke assembly 31 includes a first yoke plate 311, a second yoke plate 311, and two side yoke plates 311. The two side yoke plates 311 are spaced apart from each other and are both connected between the first yoke plate 311 and the second yoke plate 311. Thus, the first yoke plate 311, the second yoke plate 311, and the two side yoke plates 311 form a closed ring structure. In this embodiment, a through hole 31c is provided on either the first yoke plate 311 or the second yoke plate 311, as long as the through hole 31c can accommodate the insertion of the push rod 22.

[0064] For example, in some embodiments, the yoke assembly 31 can be a single structural component. Specifically, the yoke assembly 31 includes a single-piece closed yoke ring. The closed yoke ring can be formed by bending a metal sheet or by casting, and there is no limitation on this.

[0065] It should be noted that the stationary iron core 33 is not necessary in the magnetic circuit section 30. For example, as shown in Figure 5, the stationary iron core 33 can be omitted. In this case, the moving iron core 32 can drive the push rod 22 to move axially relative to the yoke assembly 31 by adsorbing the first wall 31a.

[0066] In embodiments where the magnetic circuit portion 30 includes a stationary iron core 33, the stationary iron core 33 may be connected to the first wall 31a. Thus, the moving iron core 32 can increase the magnetic force moving towards the first wall 31a by attracting the stationary iron core 33, thereby providing a greater driving force for the axial movement of the push rod 22.

[0067] Continuing with Figures 2 and 3, the magnetic circuit section 30 includes a metal shell 34, which is disposed within the space enclosed by the yoke assembly 31, and the metal shell 34 is axially arranged around the push rod 22.

[0068] The magnetic circuit section 30 also includes a coil 40, which generates an electromagnetic field when energized. The coil 40 is located within the space enclosed by the yoke assembly 31 and is wound around the outer periphery of the metal shell 34. The electromagnetic field generated when the coil 40 is energized magnetizes the moving iron core 32, causing it to attract the stationary iron core 33. Thus, the moving iron core 32, via the push rod 22, moves the push seat 21 towards the stationary contact 11, causing the moving contact piece 12 on the push seat 21 to contact the stationary contact 11. Therefore, by controlling the energization of the coil 40, the relay 100 can be opened and closed, enabling the relay 100 to conduct or disconnect the automatic control circuit it is connected to; that is, the relay 100 acts as a "switch" in the automatic control circuit.

[0069] Furthermore, a return spring 35 is provided between the stationary iron core 33 and the moving iron core 32.

[0070] When coil 40 is energized, the moving iron core 32 is magnetized and attracts the stationary iron core 33. Therefore, the moving iron core 32 overcomes the elastic force of the return spring 35 and moves towards the stationary iron core 33, thereby pushing rod 22 to move push base 21 towards the stationary contact 11, causing the moving contact piece 12 on push base 21 to contact the two stationary contacts 11. In this way, the moving contact piece 12 can be used to conduct the electrical connection between the two stationary contacts 11.

[0071] When the coil 40 is de-energized, the moving iron core 32 moves away from the yoke plate 311 under the drive of the return spring 35. In this way, the moving iron core 32 moves the push seat 21 away from the stationary contact 11 via the push rod 22, so that the moving contact piece 12 is separated from the two stationary contacts 11, thereby breaking the electrical contact.

[0072] Referring again to Figures 2 and 3, in this embodiment, the metal shell 34 includes a non-magnetic part 341 and a magnetic part 342. The magnetic part 342 is connected to the yoke assembly 31 through the non-magnetic part 341. Thus, since the non-magnetic part 341 does not have the characteristic of conducting magnetic lines of force, the magnetic lines of force from the magnetic part 342 will not be conducted to the yoke assembly 31 through the non-magnetic part 341. Therefore, it is possible to prevent the metal shell 34 from directly passing over structures such as the moving iron core 32 disposed inside it when conducting magnetic lines of force.

[0073] For ease of understanding, taking the embodiment where the yoke assembly 31 includes a first wall 31a and a second wall 31b as an example, the magnetically conductive part 342 is connected to the first wall 31a through the non-magnetically conductive part 341, and magnetic lines of force can be conducted between the magnetically conductive part 342 and the second wall 31b. In this embodiment, the non-magnetically conductive part 341 is connected between the magnetically conductive part 342 and the first wall 31a to isolate the magnetic conduction between the magnetically conductive part 342 and the first wall 31a. Therefore, the magnetic lines of force conducted from the second wall 31b to the magnetically conductive part 342 will not be directly conducted to the first wall 31b through the magnetically conductive part 342, that is, the magnetic lines of force from the second wall 31b are prevented from being directly conducted to the first wall 31a through the metal shell 34.

[0074] In this embodiment, magnetic lines of force can be conducted between the magnetically conductive part 342 and the moving iron core 32. For example, at least a portion of the structure of the moving iron core 32 is located within the metal shell 34, and the magnetically conductive part 342 can conduct magnetic lines of force between the yoke assembly 31 and the moving iron core 32 to accommodate the movement of the push rod 22 driven by the moving iron core 32 under electromagnetic force. With this structural arrangement, since the magnetically conductive part 342 of the metal shell 34 can conduct magnetic lines of force with the moving iron core 32, the problem of increased magnetic gap when conducting magnetic lines of force to the moving iron core when using a non-magnetically conductive metal shell, as seen in related technologies, is not present. Therefore, a sufficiently large electromagnetic force can be obtained without configuring a coil 40 with more turns or increasing the pull-in voltage. Thus, the magnetic circuit part 30 of this embodiment can improve the electromagnetic force of the moving iron core 32 while taking into account the miniaturization of the relay.

[0075] For example, in an embodiment where the yoke assembly 31 includes a first wall 31a and a second wall 31b, magnetic lines of force can be conducted between the magnetically conductive part 342 and the second wall 31b. Since magnetic lines of force can be conducted between the magnetically conductive part 342 and the moving iron core 32, the magnetic lines of force from the second wall 31b can be conducted to the moving iron core 32 via the magnetically conductive part 342, thereby satisfying the need to magnetize the moving iron core 32. In this way, the magnetized moving iron core 32 will attract the stationary iron core 33, thereby driving the push rod 22 to move axially relative to the yoke assembly 31.

[0076] The metal shell 34 can be a cylindrical structure that is enclosed on all sides and open at both ends. In some embodiments, the metal shell 34 can be a cylindrical structure (i.e., a cylindrical structure with a circular cross-section) or a rectangular cylindrical structure (i.e., a cylindrical structure with a rectangular cross-section). Understandably, when the metal shell 34 is a cylindrical structure, it is not limited to having equal circumferential dimensions at any point. For example, in some embodiments, the metal shell 34 includes a first cylindrical body and a second cylindrical body connected along one side of the axial direction of the push rod 22. The first cylindrical body and the second cylindrical body can be cylinders with the same radius or cylinders with different radii. The structure of the metal shell 34 is not limited here.

[0077] In some embodiments, the metal shell 34 is a bottomed cylindrical structure. For example, the metal shell 34 has a bottom wall and side walls surrounding the bottom wall, the side walls and the bottom wall together forming a bottomed cylindrical structure.

[0078] In this embodiment, one end of the metal shell 34 facing away from its bottom wall is sealed to the first wall 31a. Since the other end of the metal shell 34 has a bottom wall, the space enclosed by the metal shell 34 has good sealing performance, which helps to improve the sealing effect on the contact part 10 and improves the working reliability of the relay 100.

[0079] It should be noted that the magnetic conductive part 342 can be positioned in various ways within the metal casing 34. For example, the magnetic conductive part 342 can be located at one end of the metal casing 34 near the first wall 31a, or it can be located in the middle of the metal casing 34 or at one end near the second wall 31b.

[0080] In the embodiments of this application, the ability to conduct magnetic field lines between two objects indicates that one object can transmit magnetic field lines to another. The ways in which magnetic field lines can be conducted between two objects include, but are not limited to, direct contact between the two objects or magnetic conduction between the two objects through a magnetically conductive structure or a magnetically conductive gap. Taking the conduction of magnetic field lines between the magnetically conductive part 342 and the second wall 31b as an example, the magnetically conductive part 342 can achieve magnetic conduction by contacting the second wall 31b, or there can be a magnetically conductive gap between it and the second wall 31b. Whether the magnetically conductive gap is filled with air or other magnetically conductive media, it is acceptable as long as the gap between the magnetically conductive part 342 and the second wall 31b meets the magnetic conduction requirements.

[0081] In some embodiments, the magnetically conductive part 342 conducts magnetic lines of force between itself and the second wall 31b through other magnetically conductive structures. For example, as shown in Figures 2 and 3, the magnetic circuit portion 30 of the relay 100 also includes a magnetically conductive cylinder 36. The magnetically conductive cylinder 36 is located within the space enclosed by the yoke assembly 31 and is fitted over the metal shell 34. The magnetically conductive cylinder 36 is capable of conducting magnetic lines of force between the yoke assembly 31 and the magnetically conductive part 342.

[0082] In some embodiments, at least a portion of the magnetically conductive portion 342 forms a sidewall surrounding the push rod 22 within the metal housing 34. In this embodiment, at least a portion of the moving iron core 32 is located within the space enclosed by the magnetically conductive portion 342, thereby facilitating the transmission of magnetic lines of force from the magnetically conductive portion 342 to the moving iron core 32.

[0083] In some embodiments, one end of the magnetically conductive cylinder 36 is fitted onto the magnetically conductive portion 342 and is capable of conducting magnetic lines of force between the two. The other end of the magnetically conductive cylinder 36 is connected to the second wall 31b or has a magnetically conductive gap, so that magnetic lines of force can also be conducted between the magnetically conductive cylinder 36 and the second wall 31b. Thus, the magnetic lines of force of the second wall 31b can be conducted to the magnetically conductive portion 342 via the magnetically conductive cylinder 36.

[0084] It should be noted that in this embodiment, the magnetic cylinder 36 can not only conduct the magnetic lines of force of the second wall 31b to the magnetic part 342, but also, since the magnetic cylinder 36 is cylindrical, after the magnetic lines of force of the second wall 31b are conducted to the magnetic cylinder 36, the magnetic cylinder 36 has a converging effect on the magnetic lines of force, thereby converging the magnetic lines of force to the periphery of the magnetic part 342, so as to facilitate the conduction of the magnetic lines of force to the moving iron core 32 through the magnetic part 342, improve the magnetization effect on the moving iron core 32, and enhance the electromagnetic power of the moving iron core 32.

[0085] Furthermore, continuing with Figure 3, the second wall 31b is provided with an insertion hole 31d. The end of the magnetic cylinder 36 away from the first wall 31a is inserted into the insertion hole 31d and magnetically engages with the wall of the insertion hole 31d. In this embodiment, the outer wall of the magnetic cylinder 36 can either be in contact with the hole wall or maintain a magnetic gap. As long as the magnetic cylinder 36 magnetically engages with the hole wall, the magnetic lines of force of the second wall 31b can be transmitted to the magnetically conductive part 342.

[0086] In embodiments where the magnetic circuit portion 30 includes a magnetically conductive cylinder 36, the magnetically conductive portion 342 of the metal shell 34 only needs to be partially housed within the magnetically conductive cylinder 36 to achieve magnetically conductive engagement between the magnetically conductive portion 342 and the magnetically conductive cylinder 36. For example, as shown in FIG4, a portion of the structure of the magnetically conductive portion 342 is located within the magnetically conductive cylinder 36. As another example, as shown in FIG6, the entire structure of the magnetically conductive portion 342 is housed within the magnetically conductive cylinder 36.

[0087] Continuing with Figure 5, in the embodiment where the stationary iron core 33 is not provided on the first wall 31a, the two ends of the return spring 35 can respectively abut against the first wall 31a and the moving iron core 32. In this way, the return spring 35 can maintain the reset effect on the moving iron core 32. In this embodiment, when the coil 40 is energized, the moving iron core 32 is magnetized and attracted to the first wall 31a, causing the push rod 22 to move towards the side where the stationary contact 11 is located, thereby making the moving contact piece 12 on the push rod 21 contact the stationary contact 11. When the energization of the coil 40 is disconnected, the moving iron core 32 loses its magnetism or its magnetic force weakens, and the elastic force of the return spring 35 drives the moving iron core 32 to reset, that is, the moving iron core 32 moves away from the first wall 31a, thereby causing the push rod 22 to move closer to the first wall 31a with the push rod 22. Thus, the moving contact piece 12 on the push rod 21 moves away from the stationary contact 11.

[0088] There are multiple implementation methods for the magnetic coupling between the magnetic conductive part 342 and the moving iron core 32.

[0089] For example, as shown in Figures 3 and 4, in some embodiments, a magnetic gap exists between the magnetically conductive part 342 and the moving iron core 32. The presence of this magnetic gap ensures that the magnetically conductive part 342 can transmit magnetic lines of force to the moving iron core 32. Furthermore, the gap prevents contact between the magnetically conductive part 342 and the moving iron core 32, thus preventing frictional resistance between the moving iron core 32 and the magnetically conductive part 342 during movement, thereby improving the smoothness of the moving iron core 32's movement.

[0090] Furthermore, the moving iron core 32 and the non-magnetic part 341 are fitted with a clearance, and the clearance between the moving iron core 32 and the non-magnetic part 341 is smaller than the clearance between the moving iron core 32 and the magnetic part 342. This arrangement allows the non-magnetic part 341 to provide a good guiding effect for the moving iron core 32, thus improving the stability of its movement. Because the clearance between the moving iron core 32 and the non-magnetic part 341 is smaller than the clearance between the moving iron core 32 and the magnetic part 342, even if the inner walls of the moving iron core 32 and the magnetic part 342 attract each other (i.e., lateral attraction), the moving iron core 32 is less likely to tilt relative to the axial direction of the push rod 22 under the constraint of the non-magnetic part 341. This maintains the clearance between the moving iron core 32 and the magnetic part 342, reducing the friction between the moving iron core 32 and the metal shell 34.

[0091] For example, referring to Figures 5 and 6, in some embodiments, the outer wall of the moving iron core 32 is provided with a magnetic shielding layer 32a, which at least covers the surface of the moving iron core 32 that overlaps with the magnetic conductive part 342. In this embodiment, the surface of the moving iron core 32 that overlaps with the magnetic conductive part 342 refers to the portion where the outer wall of the moving iron core 32 overlaps with the inner wall of the magnetic conductive part 342 in the axial direction perpendicular to the push rod 22.

[0092] With this structural arrangement, on the one hand, the magnetic shielding layer 32a maintains the gap between the moving iron core 32 and the inner wall of the magnetic conductive part 342, so that the moving iron core 32 and the inner wall of the magnetic conductive part 342 do not contact each other. As a result, the magnetic conductive part 342 will not generate an axial attraction force perpendicular to the push rod 22 on the moving iron core 32. That is, this structural arrangement reduces the lateral attraction between the magnetic conductive part 342 and the moving iron core 32.

[0093] Given that the frictional force of the moving iron core 32 moving in the magnetic conductive part 342 is related to the coefficient of friction (which is related to the roughness between the contact surfaces) and the holding force in the direction perpendicular to the push rod 22, in this embodiment, the magnetic shielding layer 32a is used to prevent the moving iron core 32 from contacting the inner wall of the magnetic conductive part 342 (reducing the coefficient of friction between the iron core and the inner wall of the magnetic conductive part 342). At the same time, the magnetic shielding layer 32a reduces the lateral attraction between the moving iron core 32 and the magnetic conductive part 342 (reducing the holding force in the direction perpendicular to the push rod 22). Thus, the frictional resistance of the moving iron core 32 relative to the magnetic conductive part 342 is reduced, and the movement of the moving iron core 32 is smoother. Without increasing the pull-in voltage and increasing the number of coil turns 40, the electromagnetic power of the moving iron core 32 can be improved, which is beneficial for the relay 100 to take into account both reducing the pull-in voltage and miniaturization.

[0094] The magnetic shielding layer 32a includes at least one of a Teflon coating, a non-magnetic stainless steel coating, an Ag coating, or a Cu coating. This magnetic shielding layer 32a has good wear resistance and good sliding effect, reducing the resistance during the movement of the moving iron core 32.

[0095] Furthermore, the magnetic shielding layer of this structure can be made thin enough to reduce magnetic resistance. For example, the thickness of the magnetic shielding layer can be less than or equal to 0.3 mm. Specifically, the thickness of the magnetic shielding layer can be 0.1 mm, 0.2 mm, or 0.3 mm, and is not limited here.

[0096] Continuing with Figures 5 and 6, a portion of the structure of the magnetic shielding layer 32a is in contact with the inner wall of the magnetically conductive part 342. With this structural arrangement, the magnetically conductive part 342 can guide the movement of the moving iron core 32, thereby further enhancing the stability of the moving iron core 32's movement.

[0097] Furthermore, a portion of the magnetic shielding layer 32a is in contact with the inner wall of the non-magnetic part 341. With this structural arrangement, both the non-magnetic part 341 and the magnetic part 342 can guide the movement of the moving iron core 32, thereby further enhancing the movement stability of the moving iron core 32.

[0098] It should be noted that the magnetic shielding layer on the outer wall of the moving iron core 32 may not be in contact with the inner wall of the non-magnetic part 341. For example, the entire structure of the magnetic shielding layer may be located inside the magnetically conductive part 342.

[0099] As shown in Figures 7 and 8, the non-magnetic part 341 has an outer flange 3412 at the end away from the magnetic part 342, and the outer flange 3412 is connected to the first wall 31a. The outer flange 3412 facilitates a stable connection between the metal shell 34 and the first wall 31a by welding.

[0100] Continuing with Figures 7 and 8, in the embodiment where the relay 100 includes a stationary iron core 33, the sidewall of the stationary iron core 33 can be in contact with the inner wall of the non-magnetic portion 341. In this way, the space enclosed by the non-magnetic portion 341 can be fully utilized to accommodate the stationary iron core 33, thereby increasing its cross-sectional area. Since a larger magnetic circuit cross-sectional area results in a lower pull-in voltage, this structural arrangement allows the stationary iron core 33 to provide a sufficiently large pull-in area to engage with the moving iron core 32, thus reducing the pull-in voltage and consequently lowering the power consumption of the relay 100.

[0101] Understandably, since the current in coil 40 remains constant, the more turns coil 40 has, the greater the electromagnetic force. The electromagnetic force required for relay 100 to engage only needs to satisfy the condition that the moving iron core 32, via the push rod 22, moves the push base 21 closer, causing the moving contact 12 on the push base 21 to contact the stationary contact 11. In other words, the electromagnetic force required for relay 100 to engage meets a preset value. With the structure where the sidewall of the stationary iron core 33 contacts the inner wall of the non-magnetic part 341, the cross-sectional area of ​​the stationary iron core 33 is sufficiently large. Therefore, if the current in coil 40 remains constant, this structure can reduce the number of turns in coil 40, facilitating the miniaturization of relay 100.

[0102] The sidewall of the stationary iron core 33 is not limited to contacting the inner wall of the non-magnetic part 341. For example, as shown in FIG9, the sidewall of the stationary iron core 33 is spaced apart from the inner wall of the non-magnetic part 341. This provides a certain assembly allowance between the stationary iron core 33 and the non-magnetic part 341 when the stationary iron core 33 and the metal shell 34 are assembled to the yoke assembly 31, reducing the difficulty of assembling the metal shell 34 and the stationary iron core 33 to the yoke assembly 31.

[0103] In embodiments where a magnetic shielding layer 32a is provided on the outer wall of the moving iron core 32, since the magnetic shielding layer 32a is located between the moving iron core 32 and the inner wall of the magnetically conductive part 342, the moving iron core 32 is guided by the magnetically conductive part 342 when it drives the push rod 22 to move axially. Therefore, the non-magnetically conductive part 341 may not guide the moving iron core 32.

[0104] For example, as shown in Figures 9 and 10, the non-magnetic part 341 and the moving iron core 32 are spaced apart, thus preventing friction between the moving iron core 32 and the non-magnetic part 341 during movement. In this embodiment, since the magnetic part 342 guides the moving iron core 32, the magnetic shielding layer 32a reduces the lateral attraction between the magnetic part 342 and the moving iron core 32. Therefore, even though the non-magnetic part 341 does not guide the moving iron core 32 due to the spaced arrangement, the moving iron core 32 can still move stably under the guidance of the magnetic part 342. Furthermore, since the moving iron core 32 does not rub against the non-magnetic part 341 during movement, the resistance to movement of the moving iron core 32 is further reduced under this structural arrangement, resulting in greater electromagnetic power.

[0105] Referring again to Figures 9 and 10, in some embodiments, the diameter of the non-magnetic portion 341 is larger than the diameter of the magnetic portion 342. Specifically, the non-magnetic portion 341 has an inner folded edge 3411 at the end near the magnetic portion 342, and the magnetic portion 342 has an overlapping edge 3421 at the end near the non-magnetic portion 341. The non-magnetic portion 341 and the magnetic portion 342 are coaxially arranged, and the inner folded edge 3411 is connected to the overlapping edge 3421.

[0106] In this embodiment, on the one hand, the non-magnetic part 341 and the magnetic part 342 are connected by the inner folded edge 3411 and the overlapping edge 3421 to improve the overall structural stability of the metal shell 34; on the other hand, this structural arrangement helps to keep the non-magnetic part 341 away from the moving iron core 32, so that the non-magnetic part 341 and the moving iron core 32 do not come into contact with each other, thereby reducing the friction between them, that is, reducing the movement resistance of the moving iron core 32.

[0107] It should be noted that the magnetic shielding layer 32a can be configured as needed. Specifically, the magnetic shielding layer 32a only needs to cover the surface where the moving iron core 32 overlaps with the magnetic conductive part 342. In this way, the magnetic shielding layer 32a can play a guiding and sliding role between the moving iron core 32 and the magnetic conductive part 342, while minimizing the area of ​​the magnetic shielding layer 32a, thereby reducing the material cost of the magnetic shielding material. For example, in some embodiments, the magnetic shielding layer 32a covers a portion of the outer wall surface of the moving iron core 32, that is, a portion of the outer wall surface of the moving iron core 32 is not covered by the magnetic shielding layer 32a. Specifically, referring to Figures 9 and 10, one end of the moving iron core 32 near the stationary iron core 33 protrudes from the magnetic shielding layer 32a. In this case, the magnetic shielding layer 32a covers a partial surface of the outer wall of the moving iron core 32.

[0108] As shown in Figures 11 and 12, in some embodiments, the magnetic shielding layer 32a can be applied to the entire surface of the outer wall of the moving iron core 32. Thus, during the movement of the moving iron core 32 within the metal shell 34, the magnetic shielding layer 32a can always reduce the side attraction between the moving iron core 32 and the magnetic conductive part 342. Furthermore, the cooperation between the inner wall of the metal shell 34 and the magnetic shielding layer 32a can achieve a guiding effect on the moving iron core 32, thereby improving the movement stability of the moving iron core 32.

[0109] Referring to Figures 13 and 14, in the embodiment where the inner folded edge 3411 is connected to the overlapping edge 3421, the moving iron core 32 includes an iron core body 321 and a flange 322. The flange 322 surrounds the periphery of the iron core body 321 and is housed within the non-magnetic portion 341. In this embodiment, the flange 322 increases the attraction area between the moving iron core 32 and the stationary iron core 33, thereby reducing the attraction voltage.

[0110] Continuing with Figures 13 and 14, a magnetic shielding layer 32a is provided around the periphery of the core body 321. The magnetic shielding layer 32a maintains a gap between the core body 321 and the inner wall of the magnetically conductive part 342, reducing lateral attraction between them and thus lowering the resistance when the moving core 32 moves relative to the magnetically conductive part 342 along the axial direction of the push rod 22.

[0111] Furthermore, the outer wall of the flange 322 is spaced apart from the inner wall of the non-magnetic part 341 to avoid friction between the flange 322 and the inner wall of the non-magnetic part 341, thereby helping to reduce the movement resistance of the moving iron core 32.

[0112] Referring to Figure 15, in the embodiment where the inner folded edge 3411 is connected to the overlapping edge 3421, the outer wall of the flange 322 can be in contact with the inner wall of the non-magnetic portion 341. In this way, the space enclosed by the non-magnetic portion 341 can be fully utilized to accommodate the stationary iron core 33, thereby increasing the cross-sectional area of ​​the stationary iron core 33. Since a larger magnetic circuit cross-sectional area results in a lower pull-in voltage, this structural arrangement allows the stationary iron core 33 to provide a sufficiently large pull-in area to engage with the moving iron core 32, thus reducing the pull-in voltage and consequently lowering the power consumption of the relay 100.

[0113] Referring to Figures 15 and 16, in some embodiments, the outer wall of the flange 322 is in contact with the inner wall of the non-magnetic portion 341. Thus, the non-magnetic portion 341 can guide the flange 322, thereby enhancing the motion stability of the moving iron core 32.

[0114] It should be noted that since the non-magnetic part 341 can guide the flange 322, it is not necessary for the magnetic part 342 to guide the core body 321. For example, as shown in Figure 16, a magnetic shielding layer 32a can be provided on the periphery of the core body 321. As another example, as shown in Figures 17 and 18, the magnetic shielding layer 32a may not be provided on the periphery of the core body 321. In this embodiment, a magnetic gap can be provided between the core body 321 and the inner wall of the magnetic part 342 to achieve magnetic cooperation between the core body 321 and the magnetic part 342. The gap between the core body 321 and the inner wall of the magnetic part 342 reduces or even eliminates the friction between the core body 321 and the inner wall of the magnetic part 342, thereby reducing the movement resistance of the moving core 32.

[0115] It should be noted that the parts of relay 100 not covered may be the same as or may be implemented using existing technology, and are not limited here.

[0116] For example, in some embodiments, the relay 100 includes a coil frame 50 with a mounting hole 51 in the middle. The two ends of the coil frame 50 abut against a first wall 31a and a second wall 31b, respectively, so that the wall of the mounting hole 51 encloses the space between the first wall 31a and the second wall 31b to form an assembly space. Structures such as the metal shell 34, the moving iron core 32, and the stationary iron core 33 are all disposed within this assembly space. In this embodiment, the mounting space is formed by the wall of the mounting hole 51 enclosing the space between the first wall 31a and the second wall 31b to accommodate the installation needs of structures such as the metal shell 34, the moving iron core 32, and the stationary iron core 33.

[0117] The coil 40 is wound around the coil frame 50 to surround the metal shell 34, moving iron core 32, and stationary iron core 33 located within the mounting hole 51. When the coil 40 is energized, the magnetically conductive part 342 of the metal shell 34 conducts the magnetic lines of force from the second wall 31b to the moving iron core 32, magnetizing it and causing it to magnetically attract the stationary iron core 33. Thus, the moving iron core 32, via the push rod 22, drives the push seat 21 to move towards the side where the stationary contact 11 is located, to meet the need for the push seat 21 to bring the moving contact piece 12 into contact with the stationary contact 11.

[0118] For example, referring again to Figures 1 and 2, in some embodiments, the relay 100 further includes an insulating cover 60 disposed above the yoke plate 311. Two stationary contacts 11 are respectively disposed through the top wall of the insulating cover 60, and the moving contact 12 is connected to the push base 21, both of which are disposed inside the insulating cover 60. Since the push rod 22 passes through the through hole 31c and is connected between the push base 21 and the moving iron core 32, the push rod 22 can transmit the power of the moving iron core 32 to the push base 21, so that the push base 21, carrying the moving contact 12, contacts or separates from the two stationary contacts 11.

[0119] As shown in Figure 19, in an embodiment where the metal shell 34 has a bottomed cylindrical structure, the magnetically conductive part 342 may also be located at the bottom of the metal shell 34. For example, at least a portion of the structure at the bottom of the metal shell 34 may be made of a magnetically conductive material to form the magnetically conductive part 342.

[0120] In this embodiment, the magnetic circuit part 30 may include a static magnetic conductor 37, which is disposed inside the metal shell 34 and serves to conduct magnetic lines of force between the magnetic conductor part 342 and the moving iron core 32, thereby enabling the magnetic conductor part 342 and the moving iron core 32 to conduct magnetic lines of force.

[0121] The placement of the magnetic conductive part 342 within the metal shell 34 is not limited here, as long as the magnetic conductive part 342 can be used to conduct magnetic lines of force between the yoke assembly 31 and the moving iron core 32.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A magnetic circuit portion of a relay, characterized in that, The magnetic circuit portion includes: A yoke assembly, wherein the yoke assembly is provided with a through hole for passing a push rod; A metal shell is disposed within the space enclosed by the yoke assembly. The metal shell is arranged around the axial direction of the push rod. The metal shell includes a magnetic part and a non-magnetic part. The magnetic part is connected to the yoke assembly through the non-magnetic part. A moving iron core is used to drive the push rod to move axially relative to the yoke assembly; at least a portion of the structure of the moving iron core is located inside the metal shell, and the magnetic conductive part is able to conduct magnetic lines of force between the yoke assembly and the moving iron core.

2. The magnetic circuit portion of the relay according to claim 1, characterized in that, The magnetic circuit section also includes a magnetic guide cylinder, which is located within the space enclosed by the yoke assembly. The magnetic guide cylinder is sleeved on the outside of the metal shell and can conduct magnetic lines of force between the yoke assembly and the magnetic guide section.

3. The magnetic circuit portion of the relay according to claim 2, characterized in that, The yoke assembly includes a first wall and a second wall disposed opposite to each other. The perforation is disposed on the first wall, and the second wall is provided with an insertion hole. The end of the magnetic cylinder away from the first wall is inserted into the insertion hole, and the magnetic cylinder is magnetically engaged with the hole wall of the insertion hole.

4. The magnetic circuit portion of the relay according to claim 1, characterized in that, The yoke assembly includes a first wall and a second wall disposed opposite to each other. The perforation is disposed on the first wall. The magnetically conductive part is connected to the first wall through the non-magnetically conductive part. Magnetic lines of force can be conducted between the magnetically conductive part and the second wall.

5. The magnetic circuit portion of the relay according to claim 4, characterized in that, The magnetic circuit section further includes a stationary iron core, which is connected to the first wall; wherein the stationary iron core is in contact with or spaced apart from the inner wall of the non-magnetic part.

6. The magnetic circuit portion of the relay according to claim 4, characterized in that, The magnetic circuit portion further includes a stationary iron core, which is connected to the magnetically conductive portion and / or the second wall; wherein, magnetic lines of force can be conducted between the stationary iron core and the magnetically conductive portion.

7. The magnetic circuit portion of the relay according to claim 1, characterized in that, There is a magnetic gap between the magnetically conductive part and the moving iron core, and the moving iron core is in clearance fit with the non-magnetically conductive part. The gap between the moving iron core and the non-magnetically conductive part is smaller than the gap between the moving iron core and the magnetically conductive part.

8. The magnetic circuit portion of the relay according to claim 1, characterized in that, The outer wall of the moving iron core is provided with a magnetic shielding layer, which at least covers the surface of the moving iron core that overlaps with the magnetic conductive part.

9. The magnetic circuit portion of the relay according to claim 8, characterized in that, The magnetic shielding layer includes at least one of a Teflon coating, a non-magnetic stainless steel coating, an Ag coating, or a Cu coating.

10. The magnetic circuit portion of the relay according to claim 8 or 9, characterized in that, Part of the magnetic shielding layer is in contact with the inner wall of the magnetic conductive part.

11. The magnetic circuit portion of the relay according to claim 8 or 9, characterized in that, The diameter of the non-magnetic part is larger than the diameter of the magnetic part. The non-magnetic part has an inner folded edge at one end near the magnetic part, and the magnetic part has an overlapping edge at one end near the non-magnetic part. The non-magnetic part and the magnetic part are coaxially arranged, and the inner folded edge is connected to the overlapping edge.

12. The magnetic circuit portion of the relay according to claim 11, characterized in that, The moving iron core includes an iron core body and a flange. The flange surrounds the periphery of the iron core body and is housed within the non-magnetic part. The magnetic shielding layer is disposed on the periphery of the iron core body.

13. The magnetic circuit portion of the relay according to claim 12, characterized in that, The outer wall of the flange is spaced apart from the inner wall of the non-magnetic part, or the outer wall of the flange is in contact with the inner wall of the non-magnetic part.

14. The magnetic circuit portion of the relay according to claim 8, characterized in that, The entire structure of the magnetic shielding layer is located within the magnetic conductive part.

15. The magnetic circuit portion of the relay according to claim 1, characterized in that, The moving iron core includes an iron core body and a flange. The flange surrounds the periphery of the iron core body and is housed within the non-magnetic part. The outer wall of the flange is in contact with the inner wall of the non-magnetic part, and a magnetic gap exists between the iron core body and the inner wall of the magnetic part.

16. The magnetic circuit portion of the relay according to claim 1, characterized in that, The metal shell has a bottomed cylindrical structure, and at least a portion of the bottom of the metal shell is made of a magnetically conductive material to form the magnetically conductive part.

17. The magnetic circuit portion of the relay according to claim 1, characterized in that, The yoke assembly includes a first wall and a second wall disposed opposite to each other, and the perforation is disposed on the first wall; the magnetic conductive part is located in the metal shell at one end near the first wall or one end near the second wall.

18. A relay, characterized in that, Includes the magnetic circuit portion of the relay as described in any one of claims 1 to 17.

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