Magnetic circuit part of relay and relay

Abstract

The utility model relates to a magnetic circuit part of a relay and the relay, the magnetic circuit part of the relay comprises a yoke assembly, a metal shell and a movable iron core, the yoke assembly is provided with a through hole for a push rod to pass through, the metal shell is arranged in a space enclosed by the yoke assembly, the metal shell is arranged around the axial direction of the push rod, and the movable iron core is arranged in the through hole. The metal shell comprises a magnetic conductive part and a non-magnetic conductive part, and the magnetic conductive part is connected with the yoke assembly through the non-magnetic conductive part; the movable iron core is used for driving the push rod to move axially relative to the yoke assembly; at least part of the structure of the movable iron core is located in the metal shell, and the magnetic conduction part can conduct magnetic lines between the yoke assembly and the movable iron core. According to the magnetic circuit part of the relay and the relay, the electromagnetic power of the movable iron core is improved while the miniaturization of the relay is considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, in particular to a magnetic circuit part of a relay and the relay. BACKGROUND

[0002] As an electronic control device, a relay has a control system (also known as an input loop) and a controlled system (also known as an output loop), and is usually applied in an automatic control circuit. It is actually a kind of "automatic switch" that uses a small current to control a large current. Therefore, it plays a role of automatic regulation, safety protection, and conversion of circuits in the circuit. A high-voltage direct-current relay is a relay with the ability to handle high power. It has unmatched reliability and long service life under harsh conditions such as high voltage and large current, and is widely used in various fields, such as the field of new energy vehicles.

[0003] In related technologies, a metal shell is usually used to guide the movement of a moving iron core to make the movement of the moving iron core stable.

[0004] However, if the entire structure of the metal shell adopts a magnetic conductive material, the magnetic lines of force introduced into the yoke assembly from one end of the metal shell 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 does not adopt a magnetic conductive material, the wall thickness of the metal shell corresponding to the position of 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 the need to configure more turns of the coil or increase the pull-in voltage. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide a magnetic circuit part of a relay and the relay to solve the problem of how to balance the miniaturization of the relay while improving the electromagnetic power of the moving iron core.

[0006] In one aspect, the present application provides a magnetic circuit part of a relay, which comprises:

[0007] A yoke assembly, which is provided with a through hole for penetrating a push rod;

[0008] A metal shell, which is arranged in a space enclosed by the yoke assembly, surrounds the push rod in the axial direction, and comprises a magnetic conductive part and a non-magnetic conductive part, wherein the magnetic conductive part is connected to the yoke assembly through the non-magnetic conductive part;

[0009] A moving iron core, which is used to drive the push rod to move relative to the yoke assembly in the axial direction; at least part of the structure of the moving iron core is located in the magnetic conductive part, and the moving iron core and the magnetic conductive part can conduct magnetic lines of force.

[0010] The magnetic circuit part of the relay, the metal shell comprises a magnetic conductive part and a non-magnetic conductive part, and since at least part of the structure of the moving iron core is located in the metal shell, the magnetic conductive part can conduct magnetic lines of force between the yoke assembly and the moving iron core, thus eliminating the problem of increasing the magnetic gap when conducting magnetic lines of force to the moving iron core when the metal shell is made of a non-magnetic material in the related art, improving the electromagnetic power of the moving iron core, so that a coil with more turns or an attraction voltage is not needed to obtain sufficient electromagnetic power, thus the application scheme realizes the consideration of the miniaturization of the relay while improving the electromagnetic power of the moving iron core.

[0011] In one embodiment, the magnetic circuit part further comprises a magnetic conductive cylinder located in the space enclosed by the yoke assembly, the magnetic conductive cylinder being sleeved on the outside of the metal shell, and the magnetic conductive cylinder being capable of conducting magnetic lines of force between the yoke assembly and the magnetic conductive part. In this embodiment, the magnetic conductive cylinder not only conducts the magnetic lines of force of the yoke assembly to the magnetic conductive part, but also has a converging effect on the magnetic lines of force after the magnetic lines of force of the yoke assembly are conducted to the magnetic conductive cylinder due to the cylindrical shape of the magnetic conductive cylinder, and then the magnetic lines of force are converged on the circumferential side of the magnetic conductive part, so as to facilitate the transmission of the magnetic lines of force to the moving iron core through the magnetic conductive part, improve the magnetization effect on the moving iron core, and enhance the electromagnetic power of the moving iron core.

[0012] In one embodiment, the yoke assembly comprises oppositely arranged first and second walls, the through hole is arranged on the first wall, the second wall is provided with a insertion hole, one end of the magnetic conductive cylinder away from the first wall is inserted into the insertion hole, and the magnetic conductive cylinder is in magnetic conductive cooperation with the hole wall of the insertion hole.

[0013] In one embodiment, the yoke assembly comprises oppositely arranged first and second walls, the through hole is arranged on the first wall, the second wall is provided with a insertion hole, one end of the magnetic conductive cylinder away from the first wall is inserted into the insertion hole, and the magnetic conductive cylinder is in magnetic conductive cooperation with the hole wall of the insertion hole.

[0014] In one of the embodiments, the magnetic circuit part further comprises a static core connected to the first wall; and wherein the static core is in contact with or spaced apart from the inner wall of the non-magnetic conducting part. In this embodiment, when the static core is in contact with the non-magnetic conducting part, the space enclosed by the non-magnetic conducting part can be fully utilized to arrange the static core, so as to increase the cross-sectional area of the static core. Since the larger the cross-sectional area of the magnetic circuit is, the lower the pull-in voltage is, the static core in this structure can provide a large enough pull-in area to attract the moving core, so as to reduce the pull-in voltage and then reduce the power consumption of the relay. When the static core is spaced apart from the non-magnetic conducting part, the gap between the static core and the non-magnetic conducting part provides a certain assembly allowance, which reduces the difficulty of assembling the metal shell and the static core to the yoke assembly.

[0015] In one of the embodiments, the magnetic circuit part further comprises a static core connected to the magnetic conducting part and / or the second wall; and wherein the static core and the magnetic conducting part can conduct magnetic lines.

[0016] In one of the embodiments, there is a magnetic conducting gap between the magnetic conducting part and the moving core, the moving core is in clearance fit with the non-magnetic conducting part, and the gap between the moving core and the non-magnetic conducting part is smaller than the gap between the moving core and the magnetic conducting part. In this embodiment, based on the existence of the magnetic conducting gap, on the one hand, the magnetic conducting part can conduct magnetic lines to the moving core, and on the other hand, the existence of the magnetic conducting gap makes the magnetic conducting part not in contact with the moving core, so that the moving core does not generate frictional resistance with the magnetic conducting part during movement, so as to improve the smoothness of the movement of the moving core.

[0017] In one of the embodiments, the outer wall of the moving core is provided with a magnetic shielding layer, and the magnetic shielding layer covers at least the surface of the moving core overlapping with the magnetic conducting part. Through this structure, on the one hand, the magnetic shielding layer keeps the gap between the moving core and the inner wall of the magnetic conducting part, so that the moving core and the inner wall of the magnetic conducting part do not contact each other, and then the magnetic conducting part does not generate an attractive force on the moving core perpendicular to the axial direction of the push rod, that is, this structure reduces the side attraction between the magnetic conducting part and the moving core.

[0018] In one of the embodiments, the magnetic shielding layer comprises at least one of a Teflon plating layer, a non-magnetic stainless steel plating layer, an Ag plating layer or a Cu plating layer. Such a magnetic shielding layer has good wear resistance and good sliding effect, which reduces the resistance of the moving core during movement.

[0019] In one of the embodiments, part of the structure of the magnetic shielding layer is in contact with the inner wall of the magnetic conducting part. In this structure, the magnetic conducting part can guide the movement of the moving core, and then further improve the stability of the movement of the moving core.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] On the other hand, this application provides a relay, including the magnetic circuit portion of the relay as described above. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a relay in one embodiment.

[0028] Figure 2 for Figure 1 The diagram shows an exploded view of the relay.

[0029] Figure 3 This is a cross-sectional schematic diagram of a portion of the relay structure in one embodiment.

[0030] Figure 4 for Figure 3 A magnified view of the structure within the middle circle.

[0031] Figure 5 This is a cross-sectional schematic diagram of a portion of the relay structure in another embodiment.

[0032] Figure 6 for Figure 5 A magnified view of the structure within the middle circle.

[0033] Figure 7 This is a cross-sectional schematic diagram of a portion of the relay structure in another embodiment.

[0034] Figure 8 for Figure 7 A magnified view of the structure within the middle circle.

[0035] Figure 9 This is a cross-sectional schematic diagram of a portion of the relay structure in another embodiment.

[0036] Figure 10 for Figure 9 A magnified view of the structure within the middle circle.

[0037] Figure 11 This is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment.

[0038] Figure 12 for Figure 11 A magnified view of the structure within the middle circle.

[0039] Figure 13 This is a cross-sectional schematic diagram of a portion of the structure of a relay according to yet another embodiment.

[0040] Figure 14 for Figure 13 A magnified view of the structure within the middle circle.

[0041] Figure 15 This is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment of this application.

[0042] Figure 16 for Figure 15 A magnified view of the structure within the middle circle.

[0043] Figure 17 This is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment of this application.

[0044] Figure 18 for Figure 17 A magnified view of the structure within the middle circle.

[0045] Figure 19 This is a cross-sectional schematic diagram of a portion of the structure of a relay according to another embodiment of this application.

[0046] Figure label:

[0047] 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. Through hole; 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

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Combination Figure 1 and Figure 2 As shown, this application provides a relay 100 that can be applied in automatic control circuits.

[0055] The relay 100 includes a contact portion 10, an actuation mechanism 20, and a magnetic circuit portion 30.

[0056] 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.

[0057] 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.

[0058] Combination Figure 2 and Figure 3 As shown, the magnetic circuit section 30 includes a yoke assembly 31, a moving iron core 32, and a stationary iron core 33.

[0059] 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 the push rod 22 to pass through. 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 to connect with the moving iron core 32 located within the yoke assembly 31.

[0060] Continue to combine Figure 2 and Figure 3As shown, for ease of description, the side wall of the yoke assembly 31 with the through hole 31c is referred to as the "first wall 31a", and correspondingly, the side plate of the yoke assembly 31 that is disposed opposite to the first wall 31a is referred to as the "second wall 31b". That is to say, the yoke assembly 31 includes the first wall 31a and the second wall 31b disposed opposite to each other, and the through hole 31c is disposed on the first wall 31a.

[0061] by Figure 2 and Figure 3 Taking the relay 100 shown 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.

[0062] 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, and the pusher seat 21 and the moving iron core 32, which are connected to both ends of the push rod 22, are located on both sides of the yoke plate 311.

[0063] 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.

[0064] 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.

[0065] 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 connected between the first yoke plate 311 and the second yoke plate 311, thus forming a closed ring structure with the first yoke plate 311, the second yoke plate 311, and the two side yoke plates 311. 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.

[0066] 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.

[0067] It should be noted that the stationary iron core 33 is not necessary in the magnetic circuit section 30. For example, combined with Figure 5 As shown, 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.

[0068] 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.

[0069] Continue to combine Figure 2 and Figure 3 As shown, the magnetic circuit part 30 includes a metal shell 34, which is disposed within the space enclosed by the yoke assembly 31, and the metal shell 34 is arranged axially around the push rod 22.

[0070] 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. 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. Thus, 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.

[0071] Furthermore, a return spring 35 is provided between the stationary iron core 33 and the moving iron core 32.

[0072] 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.

[0073] 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.

[0074] Continue to combine Figure 2 and Figure 3 As shown, 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. Since the non-magnetic part 341 does not have the characteristic of conducting magnetic lines of force, the magnetic lines of force of the magnetic part 342 will not be conducted to the yoke assembly 31 through the non-magnetic part 341. Therefore, it is possible to avoid the metal shell 34 directly passing over structures such as the moving iron core 32 disposed inside it when conducting magnetic lines of force.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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, and the side walls and the bottom wall together form a bottomed cylindrical structure.

[0080] 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.

[0081] It should be noted that the magnetic conductive part 342 can be positioned in various ways within the metal shell 34. For example, the magnetic conductive part 342 can be located at one end of the metal shell 34 near the first wall 31a, or it can be located in the middle of the metal shell 34 or at one end near the second wall 31b.

[0082] 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.

[0083] In some embodiments, the magnetically conductive portion 342 conducts magnetic lines of force between itself and the second wall 31b through other magnetically conductive structures. For example, in combination with Figure 2 and Figure 3 As shown, the magnetic circuit portion 30 of the relay 100 also includes a magnetic guide cylinder 36. The magnetic guide cylinder 36 is located within the space enclosed by the yoke assembly 31 and is fitted onto the outside of the metal shell 34. The magnetic guide cylinder 36 is capable of conducting magnetic lines of force between the yoke assembly 31 and the magnetic guide portion 342.

[0084] 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.

[0085] In some embodiments, one end of the magnetically conductive cylinder 36 is sleeved on the magnetically conductive part 342 and can conduct 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 magnetic gap, so that magnetic lines of force can also be conducted between the magnetically conductive cylinder 36 and the second wall 31b. In this way, the magnetic lines of force of the second wall 31b can be conducted to the magnetically conductive part 342 through the magnetically conductive cylinder 36.

[0086] 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.

[0087] Furthermore, continue to combine Figure 3 As shown, 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 wall of the hole or maintain a magnetic gap. As long as the magnetic cylinder 36 magnetically engages with the wall of the hole, the magnetic lines of force of the second wall 31b can be transmitted to the magnetic part 342.

[0088] 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, such as Figure 4 As shown, a portion of the structure of the magnetically conductive part 342 is located inside the magnetically conductive cylinder 36. For example, as... Figure 6As shown, the entire structure of the magnetic conductive part 342 is housed within the magnetic conductive cylinder 36.

[0089] Continue to combine Figure 5 As shown, 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 attracts 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 21. Thus, the moving contact piece 12 on the push rod 21 moves away from the stationary contact 11.

[0090] There are multiple implementation methods for the magnetic coupling between the magnetic conductive part 342 and the moving iron core 32.

[0091] For example, combining Figure 3 and Figure 4 As shown, 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.

[0092] 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.

[0093] For example, combining Figure 5 and Figure 6As shown, 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] Continue to combine Figure 5 and Figure 6 As shown, part of the structure of the magnetic shielding layer 32a is in contact with the inner wall of the magnetic conductive part 342. With this structural arrangement, the magnetic conductive part 342 can guide the movement of the moving iron core 32, thereby further enhancing the movement stability of the moving iron core 32.

[0099] 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.

[0100] 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.

[0101] Combination Figure 7 and Figure 8 As shown, 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 the stable connection of the metal shell 34 to the first wall 31a by welding.

[0102] Continue to combine Figure 7 and Figure 8 As shown, in the embodiment where the relay 100 includes a stationary iron core 33, the sidewall of the stationary iron core 33 may 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.

[0103] 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.

[0104] The sidewalls of the stationary iron core 33 are not limited to contacting the inner wall of the non-magnetic part 341. For example, combined with Figure 9 As shown, the side wall 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 into the yoke assembly 31, reducing the difficulty of assembling the metal shell 34 and the stationary iron core 33 into the yoke assembly 31.

[0105] 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.

[0106] For example, combining Figure 9 and Figure 10 As shown, 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, and the magnetic shielding layer 32a reduces lateral attraction between the magnetic part 342 and the moving iron core 32, 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 movement resistance of the moving iron core 32 is further reduced under this structural arrangement, resulting in greater electromagnetic power.

[0107] Continue to combine Figure 9 and Figure 10 As shown, 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.

[0108] 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.

[0109] 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. This allows the magnetic shielding layer 32a to function as a guide and lubrication aid between the moving iron core 32 and the magnetic conductive part 342, while also minimizing the area of ​​the magnetic shielding layer 32a, thereby reducing the cost of the magnetic shielding material. For example, in some embodiments, the magnetic shielding layer 32a covers only 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, in conjunction with...Figure 9 and Figure 10 As shown, one end of the moving iron core 32 near the stationary iron core 33 is exposed from the magnetic shielding layer 32a. At this time, the magnetic shielding layer 32a is applied to a local surface of the outer wall of the moving iron core 32.

[0110] Combination Figure 11 and Figure 12 As shown, in some embodiments, the magnetic shielding layer 32a can cover the entire surface of the outer wall of the moving iron core 32, so that 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, and can achieve a guiding effect on the moving iron core 32 through the cooperation between the inner wall of the metal shell 34 and the magnetic shielding layer 32a, thereby improving the movement stability of the moving iron core 32.

[0111] Combination Figure 13 and Figure 14 As shown, in an 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.

[0112] Continue to combine Figure 13 and Figure 14 As shown, a magnetic shielding layer 32a is provided on the periphery of the iron core body 321. The magnetic shielding layer 32a is used to maintain a gap between the iron core body 321 and the inner wall of the magnetic conductive part 342, so as to reduce the lateral attraction between the iron core body 321 and the magnetic conductive part 342, thereby reducing the resistance when the moving iron core 32 moves relative to the magnetic conductive part 342 along the axial direction of the push rod 22.

[0113] 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.

[0114] Combination Figure 15 As shown, 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.

[0115] Combination Figure 15 and Figure 16As shown, in some embodiments, the outer wall of the flange 322 is in contact with the inner wall of the non-magnetic part 341, so that the non-magnetic part 341 can guide the flange 322 to enhance the movement stability of the moving iron core 32.

[0116] 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, combined with Figure 16 As shown, a magnetic shielding layer 32a can be provided around the periphery of the iron core body 321. For example, combined with... Figure 17 and Figure 18 As shown, the magnetic shielding layer 32a may not be provided on the periphery of the iron core body 321. In this embodiment, a magnetic gap may be provided between the iron core body 321 and the inner wall of the magnetic conductive part 342 to achieve magnetic cooperation between the iron core body 321 and the magnetic conductive part 342. The gap between the iron core body 321 and the inner wall of the magnetic conductive part 342 reduces or even eliminates the friction between the iron core body 321 and the inner wall of the magnetic conductive part 342, thereby reducing the movement resistance of the moving iron core 32.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] For example, refer to again Figure 1 and Figure 2As shown, in some embodiments, the relay 100 further includes an insulating cover 60, which is 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.

[0121] like Figure 19 As shown, in an embodiment where the metal shell 34 has a bottomed cylindrical structure, the magnetic 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 magnetic material to form the magnetic conductive part 342.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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 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.

15. 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.

16. A relay, characterized in that, Includes the magnetic circuit portion of the relay as described in any one of claims 1 to 15.

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