Magnetic circuit part of relay and relay

Abstract

The present application relates to a magnetic circuit part (30) of a relay (100) and the relay (100). The magnetic circuit part (30) comprises a yoke assembly (31), a coil assembly (40), a metal shell (34), a moving iron core (32) and a first static iron core (33), wherein the yoke assembly (31) comprises a first wall (31a) and a second wall (31b) opposite each other, the first wall (31a) being provided with a first hole (301) through which a push rod (22) passes; the coil assembly (40) is arranged between the first wall (31a) and the second wall (31b), and the coil assembly (40) is provided with a mounting hole (40a); the metal shell (34) is located within the mounting hole (40a), the metal shell (34) having openings at two ends and being arranged axially around the push rod (22); the moving iron core (32) is located within the metal shell (34); and at least part of the first static iron core (33) is located within the metal shell (34). In the direction perpendicular to the axial direction of the push rod (22), part of the first static iron core (33) overlaps part of the moving iron core (32), thereby enabling the conduction of magnetic force lines between the side wall of the first static iron core (33) and the side wall of the moving iron core (32), and allowing at least some magnetic force lines to pass through the openings at two ends of the metal shell (34).

Description

Magnetic circuit part of relay and relay

[0001] The present application claims priority to Chinese Patent Application No. 202510080339.5, filed on January 17, 2025, entitled "Magnetic circuit part of relay and relay", and Chinese Patent Application No. 202510080275.9, filed on January 17, 2025, entitled "Magnetic circuit part of relay and relay", the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of relays, and in particular to a magnetic circuit part of a relay and a relay. BACKGROUND

[0003] 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 circuit conversion in a 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 compared to conventional relays under harsh conditions such as high voltage and large current, and is widely used in various fields, such as the new energy vehicle field.

[0004] 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.

[0005] However, in this structure, the wall thickness of the metal shell will generate a magnetic gap between the magnet structures on the inside and outside of the metal shell, resulting in an increase in magnetic resistance. Therefore, to ensure normal operation, the relay in related technologies needs to increase the number of turns of the coil or increase the input voltage to ensure that the moving iron core has enough power. Increasing the number of turns of the coil will increase the size of the relay, and increasing the input voltage will increase the power consumption of the relay, which makes it difficult for the relay in related technologies to simultaneously reduce the pull-in voltage while being miniaturized. SUMMARY

[0006] According to various embodiments of the present application, a magnetic circuit part of a relay and a relay are provided.

[0007] In one aspect, the present application provides a magnetic circuit part of a relay, comprising:

[0008] A yoke assembly comprising a first wall and a second wall arranged opposite to each other, the first wall being provided with a first hole for passing a push rod;

[0009] A coil assembly arranged between the first wall and the second wall, and the coil assembly having a mounting hole;

[0010] A metal shell, located within the mounting hole, has openings at both ends and is arranged axially around the push rod.

[0011] A movable iron core is located inside the metal shell, and the movable iron core is used to drive the push rod to move axially relative to the yoke assembly;

[0012] The first stationary iron core, at least part of its structure is located inside the metal shell. In the axial direction perpendicular to the push rod, a portion of the structure of the first stationary iron core coincides with a portion of the structure of the moving iron core, such that magnetic lines of force can be conducted between the sidewalls of the first stationary iron core and the sidewalls of the moving iron core, and at least a portion of the magnetic lines of force pass through the openings at both ends of the metal shell.

[0013] In the magnetic circuit of the aforementioned relay, because the structures of the first stationary iron core and the moving iron core overlap in the axial direction perpendicular to the push rod, magnetic lines of force can be conducted between the sidewalls of the first stationary iron core and the sidewalls of the moving iron core. This allows the first stationary iron core to stably conduct magnetism between the yoke assembly and the moving iron core as the moving iron core drives the push rod axially relative to the yoke assembly. This ensures that the first stationary iron core, the moving iron core, and the yoke assembly form a closed magnetic circuit. Consequently, when the coil assembly is energized, it can maintain the magnetic force driving the push rod axially and the holding force after the movement is complete. Since the metal shell has openings at both ends, and at least some magnetic lines of force pass through these openings, the magnetic resistance is prevented from increasing due to the wall thickness of the metal shell when the magnetic lines of force pass through it. Therefore, the magnetic circuit of the relay in this application does not require increasing the number of coil turns or increasing the pull-in voltage as in related technologies. This satisfies the need for the moving iron core to obtain sufficient power and holding force in the electromagnetic field generated by the coil assembly, thus achieving both relay miniaturization and reduced pull-in voltage.

[0014] In one embodiment, when the coil assembly is energized, at least a portion of the magnetic lines of force enter the metal shell from an opening at one end of the metal shell and exit from an opening at the other end of the metal shell under the conduction of the first stationary iron core and the moving iron core.

[0015] In one embodiment, the first stationary iron core is disposed between the first wall and the moving iron core, and the push rod is axially movable through the first hole and the first stationary iron core.

[0016] In one embodiment, the magnetic circuit portion includes a second stationary iron core disposed between the second wall and the moving iron core; one end of the metal shell is sealed to the first wall, and the other end is sealed to the second stationary iron core.

[0017] In one embodiment, the first stationary iron core is disposed between the second wall and the moving iron core.

[0018] In one embodiment, the magnetic circuit portion includes a second stationary iron core disposed between the first wall and the moving iron core, and the push rod is axially movable through the first hole and the second stationary iron core.

[0019] In one embodiment, one end of the metal shell is sealed to the first wall, and the other end is sealed to the first stationary iron core.

[0020] In one embodiment, the metal shell includes a connected tube and an inner flange, the inner flange protruding from the inner wall of the tube, one end of the tube being sealed to the first wall, and the other end being sealed to the first stationary iron core through the inner flange.

[0021] In one embodiment, the metal shell includes a connected tube and an outer flange, the outer flange protruding from the outer wall of the tube, one end of the tube being sealed to the first wall through the outer flange, and the other end being sealed to the first stationary iron core.

[0022] In one embodiment, the metal shell includes a tube and an inner flange and an outer flange connected to both ends of the tube. The inner flange protrudes from the inner wall of the tube, and the outer flange protrudes from the outer wall of the tube. One end of the tube is sealed to the first stationary iron core through the inner flange, and the other end of the tube is sealed to the first wall through the outer flange.

[0023] In one embodiment, when the coil assembly is not energized, the opposing end faces of the first stationary iron core and the moving iron core are spaced upward along the axial direction of the push rod.

[0024] In one embodiment, the portions of the first stationary iron core and the moving iron core that overlap in the axial direction perpendicular to the push rod have a magnetic gap between them, the magnetic gap being less than or equal to 0.5 mm.

[0025] In one embodiment, the first stationary iron core has at least one recess at one end facing the moving iron core, and a portion of the moving iron core is housed within one of the recesses. This allows magnetic field lines to be conducted between the sidewall of the moving iron core and the sidewall of the recess.

[0026] In one embodiment, the sidewall of the recess is located inside the metal shell.

[0027] In one embodiment, the moving iron core includes at least one protruding ring portion axially disposed around the push rod, and at least a portion of the protruding ring portion is received within one of the recesses.

[0028] In one embodiment, the first stationary iron core includes a main body portion and a limiting portion connected to each other. The limiting portion is arranged around the periphery of the main body portion to form a first recessed portion on the periphery of the main body portion. The limiting portion is located inside the metal shell. The moving iron core includes a first convex ring portion. A portion of the structure of the first convex ring portion is received in the first recessed portion. The first convex ring portion is in clearance fit with the inner wall of the metal shell.

[0029] In one embodiment, the first stationary iron core includes a first protrusion that protrudes from the end face of the main body facing away from the moving iron core; wherein, the first protrusion and the first wall are capable of conducting magnetic lines of force, or the first protrusion and the second wall are capable of conducting magnetic lines of force.

[0030] In one embodiment, the main body is provided with a second recess, and a portion of the moving iron core is housed in the second recess.

[0031] In one embodiment, the moving iron core includes a second convex ring portion, a portion of which is housed within the second recessed portion. Thus, when current flows through the coil to generate an electromagnetic field, a portion of the magnetic field lines are conducted from the main body portion to the first convex ring portion, and another portion are conducted from the main body portion to the second convex ring portion, thereby achieving double-sided magnetic conduction. This allows the magnetic field lines to be conducted more efficiently from the main body portion to the moving iron core, enhancing the electromagnetic attraction of the moving iron core.

[0032] In one embodiment, the moving iron core includes a connecting portion for connecting the push rod, and at least a portion of the connecting portion is located in the second recess.

[0033] In one embodiment, a first assembly gap is provided between the first convex ring portion and the inner wall of the metal shell, and a first magnetically conductive gap is provided between the inner sidewall of the first convex ring portion and the main body portion. The first assembly gap is smaller than the first magnetically conductive gap. This achieves both miniaturization of the relay and reduction of the magnetic resistance between the moving iron core and the first stationary iron core to facilitate smooth movement of the moving iron core.

[0034] In one embodiment, the first stationary iron core includes a main body portion and a first protrusion portion connected together. The recessed portion is provided on the side of the main body portion facing the moving iron core, and the first protrusion portion protrudes from the end face of the main body portion facing away from the moving iron core. Magnetic lines of force can be conducted between the first protrusion portion and the first wall, or magnetic lines of force can be conducted between the first protrusion portion and the second wall.

[0035] In one embodiment, the moving iron core includes a first convex ring portion, a portion of which is housed in the recessed portion; wherein the main body portion is located inside the metal shell, the outer wall at the maximum diameter of the moving iron core is in clearance fit with the inner wall of the metal shell, and a second magnetically conductive gap exists between the outer wall of the first convex ring portion and the side wall of the recessed portion.

[0036] In one embodiment, a second assembly gap is provided between the outer wall at the maximum diameter of the moving iron core and the inner wall of the metal shell, the second assembly gap being smaller than the second magnetically conductive gap. This achieves both miniaturization of the relay and reduction of the magnetic resistance between the moving iron core and the first stationary iron core, facilitating smooth movement of the moving iron core.

[0037] In one embodiment, the first protrusion passes through the first hole, and magnetic lines of force can be conducted between the first protrusion and the wall of the first hole; or, the second wall has a second hole, the first protrusion passes through the second hole, and magnetic lines of force can be conducted between the first protrusion and the wall of the second hole.

[0038] In one embodiment, the first stationary iron core is disposed between the second wall and the moving iron core. The magnetic circuit portion further includes a magnetizing element, which is sheet-shaped and sandwiched between the first stationary iron core and the second wall. The magnetizing element can conduct magnetic lines of force between the second wall and the first stationary iron core. On the one hand, the magnetizing element enhances the magnetic flux conducted from the second wall to the first stationary iron core by converging the magnetic lines of force; on the other hand, when the first stationary iron core is assembled to the second wall, the magnetizing element can absorb assembly stress between the first stationary iron core and the second wall, thereby improving the connection stability between the first stationary iron core and the second wall.

[0039] In one embodiment, the magnetic circuit portion further includes a magnetizing element with a through hole. The magnetizing element is sleeved on the first protrusion, and the inner wall of the through hole contacts the peripheral side wall of the first protrusion. The magnetizing element can conduct magnetic lines of force between the second wall and the first protrusion.

[0040] In one embodiment, the magnetizing element includes a collar fitted onto the first protrusion and abutting against the inner surface of the second wall.

[0041] In one embodiment, the magnetizing element includes a collar and a protruding edge. The collar is sleeved on the first protrusion, and the protruding edge is disposed around the periphery of the collar and abuts against the inner surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is greater than the wall thickness of the collar.

[0042] In one embodiment, the magnetizing element includes a collar and a protruding edge. The collar is sleeved on the first protrusion, and the protruding edge is disposed around the periphery of the collar and abuts against the outer surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is less than the wall thickness of the collar.

[0043] In one embodiment, a sleeve protrudes from the first wall toward the side where the second wall is located, and a sleeve protrudes from the second wall toward the side where the first wall is located. The inner wall of the sleeve is connected to the surface of the second wall opposite to the first wall, and the first protrusion extends into the sleeve.

[0044] In one embodiment, the magnetic circuit portion further includes a magnetizing element, which is sheet-shaped and sandwiched between the second stationary iron core and the second wall. The magnetizing element is capable of conducting magnetic lines of force between the second wall and the second stationary iron core.

[0045] In one embodiment, the second stationary iron core has a second protrusion on the side facing the second wall. The magnetic circuit portion also includes a magnetizing component with a through hole. The magnetizing component is sleeved on the second protrusion, and the inner wall of the through hole contacts the peripheral side wall of the second protrusion. The magnetizing component can conduct magnetic lines of force between the second wall and the second protrusion.

[0046] In one embodiment, the magnetizing element includes a collar that is fitted onto the second protrusion and abuts against the inner surface of the second wall.

[0047] In one embodiment, the magnetizing element includes a collar and a protruding edge. The collar is sleeved on the second protrusion, and the protruding edge is disposed around the periphery of the collar and abuts against the inner surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is greater than the wall thickness of the collar.

[0048] In one embodiment, the magnetizing element includes a collar and a protruding edge. The collar is sleeved on the second protrusion, and the protruding edge is disposed around the periphery of the collar and abuts against the outer surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is less than the wall thickness of the collar.

[0049] In one embodiment, the magnetic circuit portion of the relay further includes a second stationary iron core, which is located on the side of the moving iron core opposite to the first stationary iron core. A reset spring is provided on the side of the moving iron core opposite to the first stationary iron core, and the reset spring is used to push the moving iron core toward the first stationary iron core to reset when the coil assembly is de-energized.

[0050] In one embodiment, the magnetic circuit portion of the relay further includes a magnetic guide cylinder, which is sleeved outside the metal shell. At least a portion of the structure of the moving iron core and at least a portion of the structure of the first stationary iron core are located inside the magnetic guide cylinder. The magnetic guide cylinder is used to converge the magnetic lines of force generated by the energized coil assembly to the periphery of the first stationary iron core.

[0051] In one embodiment, the yoke assembly includes a yoke plate and a U-shaped yoke, the yoke plate being connected to both ends of the U-shaped yoke, and the first hole being provided in the yoke plate or the U-shaped yoke.

[0052] In one embodiment, the yoke assembly includes a first yoke plate, a second yoke plate, and two side yoke plates. The two side yoke plates are spaced apart from each other and are connected between the first yoke plate and the second yoke plate. The first hole is provided in the first yoke plate or the second yoke plate.

[0053] In one embodiment, the yoke assembly includes an integrally formed closed yoke ring.

[0054] In one embodiment, a magnetic gap exists between a portion of the sidewall of the first stationary iron core and a portion of the sidewall of the moving iron core. At least one of the first stationary iron core and the moving iron core is provided with a magnetic shielding layer, at least a portion of which is located within the magnetic gap. The magnetic shielding layer maintains the gap between the moving iron core and the first stationary iron core in the axial direction perpendicular to the push rod, preventing the inner walls of the moving iron core from contacting each other. This reduces the attraction between the first stationary iron core and the moving iron core in the axial direction perpendicular to the push rod. In other words, this structural arrangement reduces the lateral attraction between the first stationary iron core and the moving iron core, thereby reducing frictional resistance and thus reducing the resistance to the moving iron core driving the push rod axially, which in turn improves the electromagnetic power of the moving iron core.

[0055] On the other hand, this application provides a relay, including the magnetic circuit portion of the relay as described above. Attached Figure Description

[0056] 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.

[0057] Figure 1 is a schematic diagram of the relay structure in one embodiment.

[0058] Figure 2 is an exploded schematic diagram of the relay shown in Figure 1.

[0059] Figure 3 is a schematic diagram of the structure in one embodiment where the moving iron core and the first stationary iron core of the relay are removed from the metal shell.

[0060] Figure 4 is a cross-sectional schematic diagram of the relay's moving iron core, first stationary iron core, and metal shell assembled in the relay as shown in Figure 3.

[0061] Figure 5 is a cross-sectional view of the relay in another embodiment.

[0062] Figure 6 is a cross-sectional schematic diagram of the relay in another embodiment.

[0063] Figure 7 is a cross-sectional schematic diagram of a relay according to another embodiment.

[0064] Figure 8 is a schematic diagram of the magnetic field conduction of the magnetic circuit portion of a relay according to one embodiment.

[0065] Figure 9 is a schematic diagram of the structure of a relay in one embodiment, where the moving contact is in contact with two stationary contacts.

[0066] Figure 10 is a cross-sectional schematic diagram of a relay according to another embodiment of this application.

[0067] Figure 11 is a cross-sectional schematic diagram of a relay according to an embodiment of this application when it is equipped with a magnetizing element.

[0068] Figure 12 is a cross-sectional view of a relay with a magnetizing element according to another embodiment of this application.

[0069] Figure 13 is a cross-sectional view of a relay with a magnetizing element according to another embodiment of this application.

[0070] Figure 14 is a cross-sectional schematic diagram of a relay according to another embodiment of this application.

[0071] Figure 15 is a cross-sectional schematic diagram of a relay in another embodiment of this application, wherein the moving contact is in contact with two stationary contacts.

[0072] Figure 16 is a schematic diagram of the structure of the relay shown in Figure 15 when the moving contact is disconnected from the two stationary contacts.

[0073] Figure 17 is a schematic diagram of the relay structure in one embodiment.

[0074] Figure 18 is an exploded view of the relay shown in Figure 17.

[0075] Figure 19 is a cross-sectional schematic diagram of a relay in one embodiment.

[0076] Figure 20 is a cross-sectional view of the relay in another embodiment.

[0077] Figure 21 is a cross-sectional schematic diagram of the relay in another embodiment.

[0078] Figure 22 is a cross-sectional view of the relay in another embodiment.

[0079] Figure 23 is a cross-sectional schematic diagram of a relay according to another embodiment.

[0080] Figure 24 is a schematic diagram of another embodiment of the relay of this application.

[0081] Figure 25 is a schematic diagram of another embodiment of the relay of this application.

[0082] Figure 26 is a schematic diagram of another embodiment of the relay of this application.

[0083] Figure 27 is a schematic diagram of another embodiment of the relay of this application.

[0084] Figure 28 is a cross-sectional schematic diagram of a relay according to another embodiment of this application.

[0085] 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; 301, first hole; 302, second hole; 31c, through hole; 31d, insertion hole; 31e, sleeve; 311, yoke plate; 312, U-shaped yoke; 32, moving iron core; 320, convex ring part; 321, first convex ring part; 322, second convex ring part; 323, connecting part; 33, first stationary iron core; 3 31. Recessed portion; 3311. First recessed portion; 3312. Second recessed portion; 33a. Main body; 33c. Limiting portion; 33b. First protrusion; 34. Metal shell; 341. Tube body; 342. Inner folded edge; 343. Outer folded edge; 35. Return spring; 36. Second stationary iron core; 361. Supporting portion; 362. Second protrusion; 37. Magnetic guide cylinder; 38. Magnetizing component; 38a. Through hole; 381. Collar; 382. Protruding edge; 40. Coil assembly; 41. Coil; 42. Coil frame; 40a. Mounting hole; 50. Insulating cover. Detailed Implementation

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening 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 intervening element. 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.

[0092] First Embodiment

[0093] As shown in Figures 1 and 2, this application provides a relay 100 that can be applied in automatic control circuits.

[0094] The relay 100 includes a contact portion 10, an actuation mechanism 20, and a magnetic circuit portion 30.

[0095] 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 influence 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.

[0096] 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.

[0097] Continuing with Figures 1 and 2, the magnetic circuit section 30 includes a yoke assembly 31, a moving iron core 32, and a first stationary iron core 33.

[0098] In some embodiments, the yoke assembly 31 includes a first wall 31a and a second wall 31b disposed opposite to each other. The first wall 31a is provided with a first hole 301 for passing through the push rod 22.

[0099] 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. The first hole 301 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.

[0100] 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.

[0101] For example, in some embodiments, the yoke assembly 31 includes a first yoke plate, a second yoke plate, and two side yoke plates. The two side yoke plates are spaced apart from each other and are both connected between the first yoke plate and the second yoke plate. Thus, the first yoke plate, the second yoke plate, and the two side yoke plates form a ring structure. In this embodiment, the first hole 301 is provided in either the first yoke plate or the second yoke plate, as long as the first hole 301 can accommodate the insertion of the push rod 22.

[0102] 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.

[0103] The structure of the yoke assembly 31 is not limited here, as long as it can meet the installation requirements of other structural components of the magnetic circuit part 30 and adapt to the requirement that the moving iron core 32 drives the push rod 22 to move axially relative to the yoke assembly 31.

[0104] The magnetic circuit portion 30 also includes a coil assembly 40 disposed between the first wall 31a and the second wall 31b. In some embodiments, the coil assembly 40 includes a coil 41 and a coil frame 42, with the coil 41 wound around the coil frame 42.

[0105] The coil frame 42 has a mounting hole 40a in the middle. The two ends of the coil frame 42 abut against the first wall 31a and the second wall 31b respectively, so that the wall of the mounting hole 40a encloses the first wall 31a and the second wall 31b to form an assembly space.

[0106] As shown in Figures 2 to 4, the magnetic circuit portion 30 includes a metal housing 34, which is located within the mounting hole 40a.

[0107] The metal shell 34 has openings at both ends and is arranged axially around the push rod 22. The moving iron core 32 is located inside the metal shell 34, and at least part of the structure of the first stationary iron core 33 is located inside the metal shell 34. Since the metal shell 34 is located inside the mounting hole 40a, the structures of the first stationary iron core 33 and the moving iron core 32 located in the metal shell 34 are also located inside the mounting hole 40a. That is to say, in the magnetic circuit part 30 of this application, the structures such as the metal shell 34, the moving iron core 32, and the first stationary iron core 33 are all located within the assembly space formed by the hole wall of the mounting hole 40a between the first wall 31a and the second wall 31b.

[0108] In the coil assembly 40, the coil 41 is wound around the coil frame 42, thus the coil 41 surrounds the metal shell 34, the moving iron core 32, and the first stationary iron core 33 located within the mounting hole 40a. The moving iron core 32, the first stationary iron core 33, and the yoke assembly 31 form a complete magnetic circuit. Thus, when the coil 41 is energized, the moving iron core 32 drives the pusher seat 21 to move towards the side where the stationary contact 11 is located via the pusher rod 22, so as to meet the need for the pusher seat 21 to make contact between the moving contact piece 12 and the stationary contact 11.

[0109] It should be noted that, based on the fact that the metal shell 34 is axially arranged around the push rod 22 and has openings at both ends, the metal shell 34 can be a cylindrical structure that is circumferentially enclosed 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.

[0110] To further understand the structure of the relay 100 of this application, the structure of the relay 100 will be described below using the yoke assembly 31, which includes the yoke plate 311 and the U-shaped yoke 312, as an example. However, this does not mean that the structure of the relay 100 is limited to this.

[0111] Referring to Figure 4, a first hole 301 is provided in the yoke plate 311. The yoke plate 311 is connected to both ends of the U-shaped yoke 312. The 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 first hole 301 in 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.

[0112] A return spring 35 is provided between the yoke plate 311 and the moving iron core 32.

[0113] When coil 41 is energized, the moving iron core 32 is magnetized and attracts the yoke plate 311. Therefore, the moving iron core 32 overcomes the elastic force of the return spring 35 and moves towards the yoke plate 311, thereby pushing rod 22 to drive push seat 21 towards the stationary contact 11, causing the moving contact piece 12 on push seat 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.

[0114] When the coil 41 is de-energized, the moving iron core 32 moves away from the yoke plate 311 under the elastic force 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.

[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, as shown in Figures 2 and 3, in some embodiments, the relay 100 further includes an insulating cover 50, which is disposed on the side of the yoke plate 311 facing away from the moving iron core 32. Two stationary contacts 11 are respectively disposed through the top wall of the insulating cover 50, and the moving contact 12 and the push base 21 are connected and both are disposed inside the insulating cover 50. Since the push rod 22 is disposed through the first hole 301 and 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 moving in the mounting hole 40a of the coil frame 42 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.

[0117] In this embodiment, in the axial direction perpendicular to the push rod 22, a portion of the structure of the first stationary iron core 33 and a portion of the structure of the moving iron core 32 overlap, allowing magnetic lines of force to be conducted between the sidewalls of the first stationary iron core 33 and the sidewalls of the moving iron core 32. Thus, as the moving iron core 32 drives the push rod to move axially relative to the yoke assembly 31, the first stationary iron core 33 can stably conduct magnetism between the yoke assembly 31 and the moving iron core 32, ensuring that the first stationary iron core 33, the moving iron core 32, and the yoke assembly 31 form a closed magnetic circuit. Consequently, when the coil assembly 40 is energized, it can maintain the magnetic force that drives the push rod 22 to move axially, as well as the holding force after the movement is completed.

[0118] It should be noted that in the axial direction perpendicular to the push rod 22, a portion of the structure of the first stationary iron core 33 and a portion of the structure of the moving iron core 32 overlap, which means that a portion of the sidewall of the first stationary iron core 33 and a portion of the sidewall of the moving iron core 32 are opposite to each other in the axial direction perpendicular to the push rod 22.

[0119] The sidewalls of the first stationary iron core 33 and the sidewalls of the moving iron core 32 are opposite each other in the axial direction perpendicular to the push rod 22. Specifically, they can be arranged opposite each other in a way that they are in contact with each other, or they can be arranged opposite each other with a gap between them.

[0120] For example, in some embodiments, in the axial direction perpendicular to the push rod 22, a portion of the sidewall of the first stationary iron core 33 and a portion of the sidewall of the moving iron core 32 are in contact, so that the first stationary iron core 33 and the moving iron core 32 can conduct magnetic lines of force to each other in the axial direction perpendicular to the push rod 22.

[0121] In other embodiments, a magnetic gap exists between a portion of the sidewall of the first stationary core 33 and a portion of the sidewall of the moving core 32 in the axial direction perpendicular to the push rod 22. This magnetic gap allows the first stationary core 33 and the moving core 32 to conduct magnetic lines of force to each other in the axial direction perpendicular to the push rod 22.

[0122] In some embodiments, the magnetic gap between a portion of the sidewall of the first stationary iron core 33 and a portion of the sidewall of the moving iron core 32 is less than or equal to 0.5 mm, which facilitates the conduction of magnetic lines of force between the portion of the sidewall of the first stationary iron core 33 and the portion of the sidewall of the moving iron core 32. The presence of the magnetic gap reduces the attraction between the first stationary iron core 33 and the moving iron core 32 in the axial direction perpendicular to the push rod 22, thereby reducing the friction between them and thus improving the electromagnetic power of the moving iron core 32 when it moves along the axial direction of the push rod 22.

[0123] The specific size of the magnetic gap can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. No limitation is made on the size of the magnetic gap.

[0124] In some embodiments, at least one of the first stationary iron core 33 and the moving iron core 32 is provided with a magnetic shielding layer, at least a portion of which is located within the magnetically conductive gap. The magnetic shielding layer maintains the gap between the moving iron core 32 and the first stationary iron core 33 in the axial direction perpendicular to the push rod 22, preventing the inner walls of the moving iron core 32 and the first stationary iron core 33 from contacting each other. This reduces the attraction between the first stationary iron core 33 and the moving iron core 32 in the axial direction perpendicular to the push rod 22. In other words, this structural arrangement reduces the lateral attraction between the first stationary iron core 33 and the moving iron core 32, thereby reducing frictional resistance and thus reducing the resistance to the moving iron core 32 driving the push rod 22 to move axially, thereby improving the electromagnetic power of the moving iron core 32.

[0125] The magnetic shielding layer includes at least one of Teflon coating, non-magnetic stainless steel coating, Ag coating, or Cu coating. This magnetic shielding layer has good wear resistance and good sliding effect, reducing the resistance during the movement of the moving iron core 32.

[0126] 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.

[0127] In some embodiments, only one of the first stationary iron core 33 and the moving iron core 32 is provided with a magnetic shielding layer. In some embodiments, both the first stationary iron core 33 and the moving iron core 32 are provided with a magnetic shielding layer.

[0128] It should be noted that the thickness of the magnetic shielding layer is not limited here.

[0129] In embodiments where only one of the first stationary iron core 33 and the moving iron core 32 is provided with a magnetic shielding layer, the thickness of the magnetic shielding layer does not exceed the magnetic gap between the sidewall of the first stationary iron core 33 and the sidewall of the moving iron core 32.

[0130] In embodiments where the first stationary iron core 33 and the moving iron core 32 are each provided with a magnetic shielding layer, the total thickness of the magnetic shielding layer on the first stationary iron core 33 and the moving iron core 32 does not exceed the magnetic gap between the sidewall of the first stationary iron core 33 and the sidewall of the moving iron core 32.

[0131] Since the metal shell 34 has openings at both ends, in the magnetic circuit portion 30 of the relay 100 of this application, at least some magnetic lines of force pass through the openings at both ends of the metal shell 34. This avoids the increase in magnetic resistance caused by the wall thickness of the metal shell 34 when the magnetic lines of force pass through the wall thickness of the metal shell 34. Therefore, the magnetic circuit portion 30 of the relay 100 of this application does not need to increase the number of turns of the coil 41 or increase the pull-in voltage as in related technologies. It can meet the need for the moving iron core 32 to obtain sufficient power and holding force in the electromagnetic field generated by the coil assembly 40. This enables the miniaturization of the relay 100 while reducing the pull-in voltage.

[0132] It should be noted that the magnetic lines of force passing through the openings at both ends of the metal shell 34 will pass through the space enclosed by the metal shell 34. Since the first stationary iron core 33 and the moving iron core 32 are located inside the metal shell 34 and can conduct magnetic lines of force, these magnetic lines of force pass through the openings at both ends of the metal shell 34 under the conduction of the first stationary iron core 33 and the moving iron core 32. Specifically, when the coil assembly 40 is energized, at least some of the magnetic lines of force enter the metal shell 34 from one opening and exit from the other opening under the conduction of the first stationary iron core 33 and the moving iron core 32.

[0133] Regarding the direction in which the magnetic field lines pass through the openings at both ends of the metal shell 34, they can pass from the opening near the first wall 31a of the metal shell 34 to the opening near the second wall 31b of the metal shell 34, or they can pass from the opening near the second wall 31b of the metal shell 34 to the opening near the second wall 31b of the metal shell 34.

[0134] For example, magnetic field lines enter the metal shell 34 from the first wall 31a and exit from the end of the metal shell 34 near the second wall 31b under the conduction of the first stationary iron core 33 and the moving iron core 32, thus conducting the magnetic field lines to the second wall 31b. Because in this magnetic circuit, the magnetic field lines in the first wall 31a enter the metal shell 34 through an opening at one end and exit to the second wall 31b through an opening at the other end, the increase in magnetic resistance due to the wall thickness of the metal shell 34 is avoided when passing through it.

[0135] For example, magnetic field lines enter the metal shell 34 from the second wall 31b and exit from the end of the metal shell 34 near the first wall 31a under the conduction of the first stationary iron core 33 and the moving iron core 32, thus conducting the magnetic field lines to the first wall 31a. Because in this magnetic circuit, the magnetic field lines in the second wall 31b enter the metal shell 34 through an opening at one end and exit to the first wall 31a through an opening at the other end, the increase in magnetic resistance due to the wall thickness of the metal shell 34 is avoided when passing through it.

[0136] It should be noted that the first wall 31a and the second wall 31b are two parts arranged opposite to each other in the yoke assembly 31. The yoke assembly 31 itself has magnetic conductivity, which can meet the need for conducting magnetic lines of force between the first wall 31a and the second wall 31b on the periphery of the coil assembly 40, so that the first stationary iron core 33, the moving iron core 32 and the yoke assembly 31 form a complete magnetic circuit.

[0137] In some embodiments, the magnetic circuit portion 30 may also include other magnetically conductive structures. For example, magnetic lines of force can be conducted between the first stationary iron core 33 and the yoke assembly 31 by providing other magnetically conductive structures, and correspondingly, magnetic lines of force can also be conducted between the moving iron core 32 and the yoke assembly 31 by providing other magnetically conductive structures. Regardless of whether the magnetic circuit portion 30 includes other magnetically conductive structures, as long as the first stationary iron core 33, the moving iron core 32, and the yoke assembly 31 form a complete magnetic circuit, such that at least some magnetic lines of force enter the metal shell 34 from the opening at one end of the metal shell 34 and exit from the opening at the other end of the metal shell 34 under the conduction of the first stationary iron core 33 and the moving iron core 32.

[0138] Regarding the arrangement of the first stationary iron core 33 and the moving iron core 32 between the first wall 31a and the second wall 31b, the first stationary iron core 33 can be arranged between the first wall 31a and the moving iron core 32, or the first stationary iron core 33 can be arranged between the second wall 31b and the moving iron core 32.

[0139] To facilitate understanding, the relevant embodiments will be described below with reference to the accompanying drawings.

[0140] As shown in Figure 4, the first stationary iron core 33 is disposed between the second wall 31b and the moving iron core 32. In this embodiment, the first stationary iron core 33 can conduct magnetic field lines between the second wall 31b and the moving iron core 32, enabling the conduction of magnetic field lines between them. Since the moving iron core 32 is located inside the metal shell 34, and at least a portion of the first stationary iron core 33 is located inside the metal shell 34, the magnetic field lines will not penetrate the wall thickness of the metal shell 34 when conducted between the first stationary iron core 33 and the moving iron core 32. Furthermore, since the metal shell 34 has openings at both ends, the magnetic field lines can enter the metal shell 34 from one opening and exit from the other opening under the conduction of the first stationary iron core 33 and the moving iron core 32, thereby avoiding the increase in magnetic resistance caused by the wall thickness of the metal shell 34.

[0141] Referring to Figure 5, in some embodiments, the magnetic circuit portion 30 of the relay 100 further includes a second stationary iron core 36. The second stationary iron core 36 is disposed between the first wall 31a and the moving iron core 32, and the push rod 22 is axially movable through the first hole 301 and the second stationary iron core 36. In this embodiment, the second stationary iron core 36 can conduct magnetic lines of force between the first wall 31a and the moving iron core 32, enabling the conduction of magnetic lines of force between them. Thus, the first stationary iron core 33, the moving iron core 32, the second stationary iron core 36, and the yoke assembly 31 constitute a complete magnetic circuit. The moving iron core 32, by attracting the second stationary iron core 36, can increase the magnetic force moving towards the first wall 31a, thereby providing a greater driving force for the axial movement of the push rod 22.

[0142] Referring to Figure 6, in some embodiments, the metal shell 34 includes a tube 341 and an inner flange 342 and an outer flange 343 connected to both ends of the tube 341. The inner flange 342 protrudes from the inner wall of the tube 341, and the outer flange 343 protrudes from the outer wall of the tube 341. In this embodiment, the arrangement of the inner flange 342 and the outer flange 343 facilitates the connection of both ends of the metal shell 34 to corresponding structural components by welding. For example, the inner flange 342 is welded to the first stationary iron core 33. The outer flange 343 is welded to the first wall 31a.

[0143] In some embodiments, one end of the tube 341 is sealed to the first stationary iron core 33 via an inner folded edge 342, and the other end of the tube 341 is sealed to the first wall 31a via an outer folded edge 343. Since the first wall 31a has a first hole 301, the space where the contact portion 10 is located is connected to the space enclosed by the metal shell 34 through the first hole 301. Therefore, the two ends of the metal shell 34 are sealed to the corresponding structural components, which enhances the sealing of the space where the contact portion 10 is located.

[0144] It should be noted that the inner folded edge 342 and the outer folded edge 343 of the metal shell 34 may be omitted. For example, in some embodiments, the metal shell 34 includes a connected tube body 341 and an inner folded edge 342, the inner folded edge 342 protruding from the inner wall of the tube body 341, one end of the tube body 341 being sealed to the first wall 31a, and the other end being sealed to the first stationary iron core 33 through the inner folded edge 342. As another example, the metal shell 34 includes a connected tube body 341 and an outer folded edge 343, the outer folded edge 343 protruding from the outer wall of the tube body 341, one end of the tube body 341 being sealed to the first wall 31a through the outer folded edge 343, and the other end being sealed to the first stationary iron core 33.

[0145] In some embodiments, when the coil assembly 40 is not energized, the opposing end faces of the first stationary iron core 33 and the moving iron core 32 are spaced apart along the axial direction of the push rod 22. Thus, when the coil assembly 40 is energized, the gap between the opposing end faces of the first stationary iron core 33 and the moving iron core 32 reduces the attraction force between them along the axial direction of the push rod 22, making it easier for the moving iron core 32 to move away from the first stationary iron core 33, thereby reducing the pull-in voltage.

[0146] It should be noted that when the coil assembly 40 is not energized, the relay 100 can also be considered to be in its initial state. Since the opposing end faces of the first stationary iron core 33 and the moving iron core 32 are spaced apart along the axial direction of the push rod 22, when the moving iron core 32 moves towards the first stationary iron core 33 to disengage the moving contact 12 from the stationary contact 11, the relay 100 returns to its initial state. The opposing end faces of the moving iron core 32 and the first stationary iron core 33 are always spaced apart along the axial direction of the push rod 22, thus avoiding noise caused by collisions between the moving iron core 32 and the first stationary iron core 33, thereby reducing the operating noise of the relay 100.

[0147] In some embodiments, the first stationary iron core 33 has at least one recess 331 at one end facing the moving iron core 32, and part of the structure of the moving iron core 32 is housed in one of the recesses 331. Thus, the structure of the moving iron core 32 located in the recess 331 is opposite to the sidewall of the recess 331, so that magnetic lines of force can be conducted between the sidewall of the moving iron core 32 and the sidewall of the recess 331.

[0148] To facilitate understanding of the structural arrangement of the first stationary iron core 33 and the moving iron core 32, the magnetic circuit portion 30 of the relay 100 will be further explained below, taking the first stationary iron core 33 being located between the second wall 31b and the moving iron core 32 as an example.

[0149] Referring to Figures 2 to 4, one end of the first stationary iron core 33 can conduct magnetic lines of force between itself and the yoke assembly 31, and the other end can conduct magnetic lines of force between itself and the moving iron core 32. The moving iron core 32 includes at least one convex ring portion 320, which is arranged axially around the push rod 22. The end of the first stationary iron core 33 facing the moving iron core 32 is provided with at least one recess portion 331, and at least a portion of the structure of one of the convex ring portions 320 is received in one of the recess portions 331. In this embodiment, the cooperation between the convex ring portion 320 and the recess portion 331 ensures that there is always a partial structural relationship between the moving iron core 32 and the first stationary iron core 33 in the axial direction perpendicular to the push rod 22. Thus, when the moving iron core 32 drives the push rod 22 to move axially, the first stationary iron core 33 can stably conduct magnetic force between the yoke assembly 31 and the moving iron core 32, thereby ensuring the formation of a closed magnetic circuit to maintain the magnetic force of the moving iron core 32 driving the push rod 22 to move axially and the holding force after the movement is in place.

[0150] Since the yoke assembly 31 and the moving iron core 32 are magnetically guided by the first stationary iron core 33, the magnetic circuit will not pass through the metal shell 34, thereby avoiding the increase of magnetic resistance caused by the wall thickness of the metal shell 34 creating a magnetic gap.

[0151] It should be noted that in related technologies, to compensate for the increased magnetic reluctance caused by the magnetic gap generated by the metal shell 34, it is usually necessary to increase the number of turns of the coil 41 or increase the pull-in voltage to maintain sufficient power for the moving iron core 32 to drive the push rod 22 to move the push seat 21 closer to the stationary contact 11. Increasing the number of turns of the coil 41 will lead to an increase in the size of the relay 100, which is not conducive to the miniaturization of the relay 100. Increasing the pull-in voltage means that a larger voltage needs to be configured, which will also increase the power consumption.

[0152] Given that the magnetic circuit portion 30 of this application can avoid the increase in magnetic resistance caused by the magnetic gap generated by the wall thickness of the metal shell 34, it is not necessary to increase the number of turns of the coil 41 or increase the pull-in voltage as in related technologies. This satisfies the need for the moving iron core 32 to drive the push seat 21 close to the stationary contact 11 via the push rod 22. Therefore, adopting the magnetic circuit portion 30 of this application can achieve both miniaturization of the relay 100 and reduction of the pull-in voltage.

[0153] 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 the other object. 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.

[0154] Taking the conduction of magnetic field lines between the first stationary iron core 33 and the yoke assembly 31 as an example, the first stationary iron core 33 can achieve magnetic conduction between the two by contacting the yoke assembly 31. In some embodiments, there may also be a magnetically conductive gap between the first stationary iron core 33 and the yoke assembly 31. Whether the magnetically conductive gap is filled with air or other magnetically conductive media, it is acceptable as long as the gap between the first stationary iron core 33 and the yoke assembly 31 meets the magnetic conduction requirements.

[0155] Referring to Figure 2, in some embodiments, the structure in the first stationary iron core 33 used to enclose the recess 331 is located inside the metal shell 34. That is, the sidewalls of the recess 331 are all located within the space enclosed by the metal shell 34. Since the convex ring 320 cooperates with the recess 331, when the moving iron core 32 moves relative to the first stationary iron core 33, part of the structure of the convex ring 320 moves within the recess 331. In this embodiment, since the sidewalls of the recess 331 are all located within the space enclosed by the metal shell 34, the convex ring 320 will not protrude from the metal shell 34 when moving at the recess 331. This allows the metal shell 34 to wrap around the mating position of the convex ring 320 and the recess 331, providing a good guiding effect and preventing the moving iron core 32 from being scratched by the end of the metal shell 34 during the process of protruding from the metal shell 34 and then retracting into the metal shell 34.

[0156] In some embodiments, one end of the metal shell 34 is sealed to the first wall 31a, and the other end is sealed to the first stationary iron core 33. Thus, the space enclosed by the metal shell 34 has good sealing properties, which helps to improve the sealing effect on the contact portion 10.

[0157] It should be noted that, under the magnetization effect of the electromagnetic field generated by the energization of the coil 41, the moving iron core 32 can not only drive the push rod 22 to move toward the side where the stationary contact 11 is located by adsorbing the yoke plate 311, but also enhance the magnetic adsorption force by setting an iron core on the yoke plate 311.

[0158] For example, as shown in Figure 5, in an embodiment where the magnetic circuit portion 30 of the relay 100 also includes a second stationary iron core 36, the second stationary iron core 36 is 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 second stationary iron core 36, thereby providing a greater driving force for the axial movement of the push rod 22.

[0159] In some embodiments, a return spring 35 is located on the side of the moving iron core 32 facing away from the first stationary iron core 33. The return spring 35 is used to push the moving iron core 32 toward the first stationary iron core 33 for reset movement when the coil assembly 40 is de-energized.

[0160] Referring to Figure 5, since the second stationary iron core 36 is located on the side of the moving iron core 32 away from the first stationary iron core 33, the return spring 35 can be disposed between the second stationary iron core 36 and the moving iron core 32. The return spring 35 is used to push the moving iron core 32 away from the second stationary iron core 36.

[0161] In some embodiments, the second stationary iron core 36 is provided with a supporting portion 361, which is used to elastically engage with the moving iron core 32 via a return spring 35. A push rod 22 passes through the return spring 35 and the supporting portion 361. Thus, when the coil 41 is energized, the moving iron core 32 is magnetized and attracts the second stationary iron core 36, causing the push rod 22 to move the push seat 21 toward the side where the stationary contact 11 is located, thereby bringing the moving contact piece 12 on the push seat 21 into contact with the stationary contact 11. When the energization of the coil 41 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 return to its original position, i.e., pushing the moving iron core 32 toward the first stationary iron core 33, thereby causing the push rod 22 to move the push seat 21 closer to the first wall 31a. Thus, the moving contact piece 12 on the push seat 21 moves away from the stationary contact 11.

[0162] Referring to Figure 6, in some embodiments, the magnetic circuit portion 30 of the relay 100 further includes a magnetic guide cylinder 37. The magnetic guide cylinder 37 is sleeved outside the metal shell 34, and at least a portion of the moving iron core 32 and at least a portion of the first stationary iron core 33 are located inside the magnetic guide cylinder 37. In this embodiment, the magnetic guide cylinder 37 can be used to concentrate the magnetic lines of force generated by the energized coil 41 to the periphery of the first stationary iron core 33, facilitating the conduction of the magnetic lines of force from the first stationary iron core 33 to the moving iron core 32.

[0163] It should be noted that magnetic lines of force can be conducted between one end of the magnetic cylinder 37 and the yoke assembly 31. For example, in some embodiments, magnetic lines of force can be conducted between the magnetic cylinder 37 and the second wall 31b, so that the magnetic lines of force in the second wall 31b can be conducted to the magnetic cylinder 37, thereby concentrating the magnetic lines of force on the periphery of the first stationary iron core 33.

[0164] The structure of the first stationary iron core 33 and the moving iron core 32, as well as the method of transmitting magnetic field lines between them, are not specified here.

[0165] For example, in some embodiments, as shown in Figures 4 and 5, the first stationary core 33 includes a main body portion 33a and a limiting portion 33c connected together. The limiting portion 33c is disposed around the periphery of the main body portion 33a, thereby forming a first recess 3311 on the periphery of the main body portion 33a. Understandably, the end face of the limiting portion 33c facing the main body portion 33a and the outer wall of the main body portion 33a together form the first recess 3311.

[0166] It should be noted that the limiting part 33c is located inside the metal shell 34. The limiting part 33c may be in contact with the inner wall of the metal shell 34, or there may be a gap between it and the inner wall of the metal shell 34; this is not limited here.

[0167] Furthermore, the first stationary iron core 33 includes a first protrusion 33b, which protrudes from the end face of the main body 33a facing away from the moving iron core 32. Magnetic lines of force can be conducted between the first protrusion 33b and the second wall 31b. That is, when the coil 41 is energized and generates an electromagnetic field, the magnetic lines of force in the second wall 31b can be conducted to the first protrusion 33b, so that the magnetic lines of force do not pass through the metal shell 34 when they are conducted to the moving iron core 32.

[0168] As shown in Figures 4 to 6, the moving iron core 32 includes a first convex ring portion 321, and part of the structure of the first convex ring portion 321 is housed in a first recessed portion 3311, thereby making the moving iron core 32 and the first stationary iron core 33 have a magnetic gap in the axial direction perpendicular to the push rod 22, thereby enabling the transmission of magnetic lines of force between the moving iron core 32 and the first stationary iron core 33.

[0169] The first protruding ring 321 is fitted with the inner wall of the metal shell 34 with a clearance so that the metal shell 34 can guide the first protruding ring 321 to move axially along the push rod 22, thereby improving the motion stability of the moving iron core 32.

[0170] In some embodiments, when the coil 41 is energized, the magnetic lines of force in the second wall 31b can be conducted sequentially through the first protrusion 33b and the main body 33a to the first protruding ring 321, thereby conducting the magnetic lines of force to the moving iron core 32 and facilitating the magnetization of the moving iron core 32. This allows the moving iron core 32 to magnetically attract the first wall 31a or the second stationary iron core 36 located on the first wall 31a, thus achieving the purpose of the moving iron core 32 driving the push seat 21 closer to the stationary contact 11 via the push rod 22, so that the moving contact piece 12 on the push seat 21 contacts the stationary contact 11.

[0171] It should be noted that the direction of magnetic field transmission is not limited to this. For example, in some embodiments, when the coil 41 is energized, the magnetic field in the first wall 31a can be conducted to the moving iron core 32 via the second stationary iron core 36. The first protruding ring 321 of the moving iron core 32 can conduct the magnetic field to the side wall opposite to the first protruding ring 321 of the main body 33a. The magnetic field conducted to the main body 33a will be conducted to the second wall 31b via the first protrusion 33b. Under the magnetic guidance of the yoke assembly 31, the second wall 31b can conduct the magnetic field from the periphery of the coil assembly 40 to the first wall 31a, thereby forming a complete magnetic circuit. This causes the moving iron core 32 to move towards the second stationary iron core 36, so that the push rod 22 drives the push seat 21 to approach the stationary contact 11, thereby making the moving contact piece 12 on the push seat 21 contact the stationary contact 11.

[0172] There are multiple ways to connect the metal shell 34 to the first stationary iron core 33.

[0173] For example, referring to Figure 6, in an embodiment where the metal shell 34 includes a connected tube 341 and an inner folded edge 342, one end of the tube 341 is connected to the first wall 31a, and the other end is fitted onto the outer periphery of the limiting portion 33c. The inner folded edge 342 is sandwiched between the limiting portion 33c and the second wall 31b, thereby stably mounting the metal shell 34 between the first wall 31a and the second wall 31b.

[0174] For example, as shown in Figure 7, in some embodiments, the inner folded edge 342 of the metal shell 34 can be omitted. One end of the metal shell 34 is connected to the first wall 31a, and the other end is cylindrical and fitted around the outer periphery of the limiting part 33c. With this structure, the limiting part 33c can limit the metal shell 34, thereby making the metal shell 34 stably installed between the first wall 31a and the second wall 31b.

[0175] It should be noted that, on the one hand, the metal shell 34 can provide a guiding effect for the movement of the moving iron core 32, thereby improving the movement stability of the moving iron core 32; on the other hand, the metal shell 34 is sealed to the first wall 31a and the first stationary iron core 33, so as to maintain the sealing of the space enclosed by the metal shell 34, thereby enhancing the sealing of the space where the contact part 10 is located.

[0176] As shown in Figure 7, the main body 33a has a second recess 3312, which is located within the space enclosed by the side wall of the first recess 3311. Part of the structure of the moving iron core 32 is housed in the second recess 3312. This arrangement improves the tightness of the fit between the moving iron core 32 and the first stationary iron core 33, thereby reducing the overall size of the relay 100 and facilitating weight reduction.

[0177] Furthermore, the moving iron core 32 includes a connecting portion 323 for connecting the push rod 22, and at least a portion of the structure of the connecting portion 323 is located in the second recess 3312. In this embodiment, the second recess 3312 can accommodate at least a portion of the structure of the connecting portion 323, thereby making the structure between the moving iron core 32 and the first stationary iron core 33 more compact while ensuring magnetic conductivity, thus reducing the overall size of the relay 100 and facilitating weight reduction.

[0178] It should be noted that the end of the push rod 22 connected to the connecting part 323 extends into the second recess 3312. Since the connecting part 323 is connected to the push rod 22, and the push rod 22 can move axially under the drive of the moving iron core 32, the second recess 3312 can provide clearance for the movement of the push rod 22, thereby preventing the push rod 22 from hitting the first stationary iron core 33, so as to improve the reliability of the movement of the push mechanism 20 under the drive of the moving iron core 32.

[0179] It should be noted that the second recess 3312 is not limited to accommodating the connecting part 323 and providing clearance for the movement of the push rod 22.

[0180] For example, in some embodiments, as shown in FIG8, the moving iron core 32 includes a second protruding ring portion 322, a portion of which is housed in a second recessed portion 3312. Since the first recessed portion 3311 is located on the periphery of the main body portion 33a, and the second recessed portion 3312 is formed in the main body portion 33a, the second recessed portion 3312 is located within the space enclosed by the sidewall of the first recessed portion 3311. In this embodiment, since a portion of the second protruding ring portion 322 is housed in the second recessed portion 3312, and the first protruding ring portion 321 mates with the first recessed portion 3311, the second protruding ring portion 322 is located inside the first protruding ring portion 321. Given that the first protruding ring portion 321 and the second protruding ring portion 322 are both portions of the moving iron core 32 that protrude toward the first stationary iron core 33, an annular space is formed between them that surrounds the push rod 22 in an axial manner. This annular space accommodates the main body portion 33a located between the first recessed portion 3311 and the second recessed portion 3312.

[0181] For ease of understanding, the magnetic circuit shown in Figure 8 will be used as an example. Specifically, as shown in Figure 8, in this structural design, when current flows through the coil 41 to generate an electromagnetic field, the magnetic lines of force conducted from the first stationary iron core 33 to the moving iron core 32 can include two parts. One part of the magnetic lines of force is conducted from the main body 33a to the first convex ring 321, and the other part of the magnetic lines of force is conducted from the main body 33a to the second convex ring 322, thereby achieving double-sided magnetic conduction. This allows the magnetic lines of force to be conducted more efficiently from the main body 33a to the moving iron core 32, thereby increasing the electromagnetic attraction of the moving iron core 32. Therefore, this structural design can increase the magnetic attraction between the moving iron core 32 and the yoke plate 311 or the second stationary iron core 36 without increasing the number of turns of the coil 41 or increasing the voltage, so as to reduce the pull-in voltage while miniaturizing the relay 100.

[0182] It should be noted that, as shown in Figures 7 and 8, in some embodiments, at least a portion of the structure of the connecting portion 323 extends along the axial direction of the push rod 22 to form a tube. Since the connecting portion 323 is located within the second recess 3312, a magnetic gap exists between a portion of the sidewall of the connecting portion 323 and a portion of the sidewall of the second recess 3312 in an axial direction perpendicular to the push rod 22. Consequently, magnetic lines of force can also be conducted between the portion of the sidewall of the connecting portion 323 and the portion of the sidewall of the second recess 3312. Therefore, the magnetic attraction between the moving iron core 32 and the yoke plate 311 or the second stationary iron core 36 can be increased without increasing the number of turns of the coil 41 or increasing the voltage, so as to reduce the pull-in voltage while miniaturizing the relay 100.

[0183] As shown in Figure 9, when the voltage applied to coil 41 reaches the pull-in voltage, the magnetic attraction between the moving iron core 32 and the second stationary iron core 36 will cause the moving iron core 32 to approach the second stationary iron core 36 and eventually be attracted to it. Thus, the moving iron core 32, via the push rod 22, drives the push seat 21 to move towards the stationary contact 11, ultimately causing the moving contact piece 12 on the push seat 21 to contact the two stationary contacts 11, thereby establishing an electrical connection between the two stationary contacts 11. In some embodiments, a first assembly gap exists between the first convex ring portion 321 and the inner wall of the metal shell 34. A first magnetically conductive gap exists between the inner wall of the first convex ring portion 321 and the main body portion 33a. The first assembly gap is smaller than the first magnetically conductive gap. Since the first convex ring portion 321 and the metal shell 34 are not magnetically conductive, the smaller the first assembly gap between the first convex ring portion 321 and the metal shell 34, the more compact the assembly, which is beneficial for the miniaturization of the relay 100. The first convex ring portion 321 and the main body portion 33a require magnetic conductivity, and the moving iron core 32 can move relative to the first stationary iron core 33 after magnetization. To avoid increased magnetic resistance between the moving iron core 32 and the first stationary iron core 33, which would hinder the smooth movement of the moving iron core 32, the first magnetically conductive gap between the first convex ring portion 321 and the main body portion 33a should not be too small. Therefore, in this embodiment, the first assembly gap is smaller than the first magnetically conductive gap, which can simultaneously achieve miniaturization of the relay 100 and reduce the magnetic resistance between the moving iron core 32 and the first stationary iron core 33, thus facilitating the smooth movement of the moving iron core 32.

[0184] It should be noted that the structure of the first stationary iron core 33 and the moving iron core 32 is not limited to the above-described cases. For example, the first stationary iron core 33 may not have a limiting portion 33c, that is, in some embodiments, the limiting portion 33c of the first stationary iron core 33 is not necessary.

[0185] Referring to Figure 10, in some embodiments, the first stationary iron core 33 includes a main body portion 33a and a first protrusion portion 33b connected together. A recessed portion 331 is provided on the side of the main body portion 33a facing the moving iron core 32. The first protrusion portion 33b protrudes from the end face of the main body portion 33a facing away from the moving iron core 32. Magnetic lines of force can be conducted between the first protrusion portion 33b and the second wall 31b. The moving iron core 32 includes a first convex ring portion 321, a portion of which is housed within the recessed portion 331. In this embodiment, the main body portion 33a is located within the metal shell 34, and the outer wall at the maximum diameter of the moving iron core 32 is in clearance fit with the inner wall of the metal shell 34. Magnetic lines of force can be conducted between the outer wall of the first convex ring portion 321 and the side wall of the recessed portion 331. That is, the structure of the recessed portion 331 formed by the main body portion 33a wraps around the outer wall of the first convex ring portion 321, so that part of the structure of the first convex ring portion 321 of the moving iron core 32 extends into the main body portion 33a. Thus, when the moving iron core 32 drives the push rod 22 to move axially, the cooperation between the first convex ring portion 321 and the first recessed portion 3311 ensures the stability of the magnetic conduction of the first stationary iron core 33 between the second wall 31b and the moving iron core 32, which helps to improve the stability of the movement of the push seat 21 driven by the push rod 22.

[0186] In some embodiments, a second assembly gap exists between the outer wall of the moving iron core 32 at its maximum diameter and the inner wall of the metal shell 34. A second magnetically conductive gap exists between the sidewall of the first convex ring portion 321 and the recessed portion 331. The second assembly gap is smaller than the second magnetically conductive gap. Similar to the above embodiment where "the first assembly gap is smaller than the first magnetically conductive gap," in this embodiment, setting the second assembly gap to be smaller than the second magnetically conductive gap can simultaneously achieve miniaturization of the relay 100 and reduce the magnetic resistance between the moving iron core 32 and the first stationary iron core 33, thereby facilitating the smooth movement of the moving iron core 32.

[0187] It should be noted that in embodiments where the first stationary iron core 33 includes a connected main body portion 33a and a first protrusion portion 33b, even without the limiting portion 33c surrounding the main body portion 33a, the metal shell 34 can still be connected to the first stationary iron core 33 in a similar manner.

[0188] For example, referring to Figure 10, in an embodiment where the metal shell 34 includes a connected tube 341 and an inner flange 342, one end of the tube 341 is connected to the first wall 31a, and the other end is fitted around the outer periphery of the main body 33a. The inner flange 342 is sandwiched between the main body 33a and the second wall 31b, thus ensuring that the metal shell 34 is stably assembled between the first wall 31a and the second wall 31b.

[0189] Understandably, the inner folded edge 342 of the metal shell 34 can be omitted. For example, one end of the metal shell 34 is connected to the first wall 31a, and the other end is cylindrical and fitted around the outer periphery of the main body 33a. With this structural arrangement, the metal shell 34 can still be stably installed between the first wall 31a and the second wall 31b by utilizing the connection between the main body 33a and the metal shell 34.

[0190] It should be noted that in the embodiment where the first stationary iron core 33 includes the first protrusion 33b, the first protrusion 33b may be in contact with the second wall 31b or there may be a magnetically conductive gap between the first protrusion 33b and the second wall 31b, as long as the second wall 31b can conduct magnetic lines of force to the first protrusion 33b to meet the needs of the first stationary iron core 33 to receive magnetic lines of force.

[0191] For example, as shown in Figures 8 to 10, in some embodiments, the second wall 31b is provided with a second hole 302, and the first protrusion 33b passes through the second hole 302. In this embodiment, the first protrusion 33b passes through the second hole 302, thereby enabling the conduction of magnetic lines of force between the first protrusion 33b and the second wall 31b.

[0192] Understandably, regardless of whether the first stationary iron core 33 includes the limiting portion 33c, the first protrusion 33b can conduct the magnetic lines of force from the second wall 31b to the main body portion 33a. In this way, the main body portion 33a conducts the magnetic lines of force to the protruding ring portion 320 of the moving iron core 32, thereby realizing the magnetic conduction of the first stationary iron core 33 between the second wall 31b and the moving iron core 32.

[0193] It should be noted that the structure of the first stationary iron core 33 and the moving iron core 32 is not limited to the cases exemplified above.

[0194] For example, in some embodiments, the moving iron core 32 includes a first convex ring portion 321, and a portion of the structure of the first stationary iron core 33 is housed within the space enclosed by the first convex ring portion 321. This also allows for a magnetically conductive gap between a portion of the sidewall of the first stationary iron core 33 and a portion of the sidewall of the moving iron core 32. Because the first convex ring portion 321 houses a portion of the structure of the first stationary iron core 33, a magnetically conductive gap exists between the first stationary iron core 33 and the moving iron core 32 in an axial direction perpendicular to the push rod 22. Therefore, in this embodiment, the first stationary iron core 33 may not have a recessed portion or a limiting portion 33c, thus simplifying the structure of the first stationary iron core 33 and making it easier to manufacture.

[0195] Referring to Figures 11 to 13, in some embodiments, the magnetic circuit portion 30 further includes a magnetizing element 38, which has a through hole 38a. The magnetizing element 38 is sleeved on the first protrusion 33b, with the inner wall of the through hole 38a contacting the peripheral sidewall of the first protrusion 33b, and the magnetizing element 38 contacting the second wall 31b. In this embodiment, on the one hand, the magnetizing element 38 enhances the magnetic flux conducted from the second wall 31b to the first stationary iron core 33 by converging the magnetic lines of force; on the other hand, when the first stationary iron core 33 is assembled to the second wall 31b, the magnetizing element 38 can absorb assembly stress between the first stationary iron core 33 and the second wall 31b, thereby improving the connection stability between the first stationary iron core 33 and the second wall 31b.

[0196] In some embodiments, the magnetizing element 38 may not have a through hole 38a. For example, the magnetizing element 38 is sheet-shaped and sandwiched between the first stationary iron core 33 and the second wall 31b. In this way, the magnetizing element 38 can also conduct magnetic lines of force between the second wall 31b and the first stationary iron core 33, thereby enhancing the magnetic flux conducted between them. At the same time, the magnetizing element 38 can also absorb the assembly tolerance between the first stationary iron core 33 and the second wall 31b along the axial direction of the push rod 22.

[0197] It should be noted that the structure of the magnetizing component 38 can be implemented in various ways, and correspondingly, the assembly method of the magnetizing component 38 between the second wall 31b and the first stationary iron core 33 can also be varied. For ease of understanding, the magnetic circuit portion 30 will be described below with reference to the structure of the magnetizing component 38, but this does not mean that the structure and assembly method of the magnetizing component 38 are limited to this.

[0198] For example, as shown in Figure 11, the magnetizing component 38 includes a collar 381, which is sandwiched between the main body 33a and the second wall 31b.

[0199] For example, as shown in Figure 12, the magnetizing element 38 includes a collar 381 and a protruding edge 382. The protruding edge 382 is arranged around the periphery of the collar 381, which is sandwiched between the peripheral wall of the first protrusion 33b and the inner wall of the second hole 302. The protruding edge 382 is sandwiched between the main body 33a and the second wall 31b. The thickness of the protruding edge 382 in the direction of the centerline of the second hole 302 is greater than the wall thickness of the collar 381, thereby increasing the surface area of ​​the magnetizing element 38 opposite to the first protrusion 33b and increasing the magnetic flux conducted by the magnetizing element 38 to the first stationary iron core 33, which in turn helps to increase the magnetic flux conducted through the first stationary iron core 33 to the moving iron core 32. Therefore, the relay 100 of this embodiment does not need to increase the number of turns of the coil 41 or increase the pull-in voltage. The electromagnetic force of the moving iron core 32 can be increased by using the magnetizing element 38, so that the relay 100 can be miniaturized while reducing the pull-in voltage.

[0200] In the embodiment where the magnetizing element 38 includes a collar 381 and a protruding edge 382, ​​the magnetizing element 38 may also be configured as follows. Specifically, referring to FIG13, the magnetizing element 38 includes a collar 381 and a protruding edge 382. The protruding edge 382 is arranged around the periphery of the collar 381, and the collar 381 is sandwiched between the peripheral sidewall of the first protrusion 33b and the inner wall of the second hole 302. The protruding edge 382 abuts against the outer surface of the second wall 31b along the wall thickness direction of the second wall 31b, and the thickness of the protruding edge 382 in the direction of the centerline of the second hole 302 is less than the wall thickness of the collar 381.

[0201] It should be noted that in the above embodiment, since the collar 381 is sandwiched between the peripheral sidewall of the first protrusion 33b and the inner wall of the second hole 302, the collar 381 can absorb the assembly tolerance between the first protrusion 33b and the second hole 302. For example, if there is a machining error during the processing of the yoke assembly 31, resulting in poor coaxiality between the first hole 301 and the second hole 302, then when assembling the first protrusion 33b into the second hole 302, it is necessary to increase the diameter of the second hole 302 to facilitate its fit with the first protrusion 33b. Otherwise, the first protrusion 33b is prone to interference with the inner wall of the second hole 302, resulting in assembly inconvenience or assembly stress. In this embodiment, since the collar 381 is sandwiched between the peripheral sidewall of the first protrusion 33b and the inner wall of the second hole 302, a certain assembly gap is allowed between the collar 381 and the peripheral sidewall of the first protrusion 33b, and a certain assembly gap is also allowed between the collar 381 and the second hole 302. In this way, the collar 381 can be used to absorb the assembly tolerance when the first protrusion 33b is assembled to the second hole 302, reduce the assembly stress, and thus improve the assembly stability between the first stationary iron core 33 and the second wall 31b.

[0202] Furthermore, the assembly gap between the collar 381 and the peripheral wall of the first protrusion 33b is smaller than the assembly gap between the collar 381 and the second hole 302. In other words, regarding these two assembly gaps, the smaller gap between the collar 381 and the peripheral wall of the first protrusion 33b improves the magnetic conductivity between them; correspondingly, the larger gap between the collar 381 and the second hole 302 allows the collar 381 to absorb the assembly tolerances when the first protrusion 33b is assembled into the second hole 302, reducing assembly stress.

[0203] In other embodiments, the structure of the yoke assembly 31 can be improved so that the position between the yoke assembly 31 and the first stationary iron core 33 where magnetic field lines can be conducted has the effect of converging magnetic field lines, thereby increasing the magnetic flux when conducting magnetic field lines to the first stationary iron core 33. For example, as shown in FIG14, a sleeve 31e protrudes from the side of the second wall 31b facing the first wall 31a. The inner wall of the sleeve 31e is connected to the surface of the second wall 31b facing away from the first wall 31a, and the first protrusion 33b extends into the sleeve 31e. In this embodiment, the sleeve 31e increases the area for conducting magnetic field lines between itself and the first protrusion 33b, that is, it increases the magnetic conduction area, which is beneficial to increasing the magnetic flux when conducting magnetic field lines to the first stationary iron core 33.

[0204] In the embodiment where the metal shell 34 includes a connected tube 341 and an inner flange 342, as shown in Figures 11 to 13, the inner flange 342 protrudes from the inner wall of the tube 341 and is sandwiched between the magnetizing member 38 and the main body 33a of the first stationary iron core 33. As shown in Figure 14, the inner flange 342 is sandwiched between the main body 33a and the sleeve 31e. In the above embodiment, the clamping of the inner flange 342 ensures good installation stability of the metal shell 34.

[0205] It should be noted that the structural design of the first stationary iron core 33 being disposed between the first wall 31a and the moving iron core 32 can refer to the structure described above where the first stationary iron core 33 is disposed between the second wall 31b and the moving iron core 32.

[0206] For ease of understanding, the structural design of the first stationary iron core 33 being disposed on the first wall 31a and the moving iron core 32 will be explained below with reference to the relay 100 shown in Figures 15 and 16.

[0207] Referring to Figures 15 and 16, in some embodiments, the first stationary iron core 33 is disposed between the first wall 31a and the moving iron core 32, and the push rod 22 is axially movable through the first hole 301 and the first stationary iron core 33. In this way, the moving iron core 32 can drive the push rod 22 to adjust the position of the moving contact piece 12, thereby achieving contact or disconnection between the moving contact piece 12 and the two stationary contacts 11.

[0208] It should be noted that, as shown in Figure 15, the relay 100 can be a normally closed relay 100, that is, when the coil 41 is not energized, the moving contact 12 conducts the electrical connection between the two stationary contacts 11.

[0209] Furthermore, the magnetic circuit portion 30 includes a second stationary iron core 36, which is disposed between the second wall 31b and the moving iron core 32. One end of the metal shell 34 is sealed to the first wall 31a, and the other end is sealed to the second stationary iron core 36.

[0210] In this embodiment, the return spring 35 can be disposed between the moving iron core 32 and the second stationary iron core 36. When the coil 41 is not energized, the return spring 35 pushes the moving iron core 32 away from the second stationary iron core 36 until the moving contact 12 contacts the two stationary contacts 11, thereby keeping the relay 100 in a normally closed state. Correspondingly, after the coil 41 is energized, the moving iron core 32 attracts the second stationary iron core 36, thereby driving the push seat 21 away from the stationary contacts 11 through the push rod 22, thus breaking the contact between the moving contact 12 and the two stationary contacts 11.

[0211] For ease of understanding, referring to Figures 6 and 15, the relay 100 shown in Figure 15, relative to the relay 100 shown in Figure 6, can be understood as the positions of the first stationary iron core 33 and the second stationary iron core 36 relative to the moving iron core 32 being interchanged, so as to adapt the relay 100 to meet the switching needs.

[0212] The relevant structures of the first stationary iron core 33, the second stationary iron core 36, and the moving iron core 32 can be adjusted according to the usage requirements of the relay 100. The specific structure of the first stationary iron core 33 and the moving iron core 32, as well as the structural arrangement for transmitting magnetic field lines between them, can be referred to the above-described implementation where the first stationary iron core 33 is positioned between the second wall 31b and the moving iron core 32; further details will not be elaborated here.

[0213] For example, in an embodiment where the first stationary iron core 33 is disposed between the first wall 31a and the moving iron core 32, the second stationary iron core 36 has a second protrusion 362 on the side facing the second wall 31b. The magnetic circuit portion 30 also includes a magnetizing member 38, which has a through hole 38a. The magnetizing member 38 is sleeved on the second protrusion 362, and the inner wall of the through hole 38a is in contact with the peripheral side wall of the second protrusion 362. The magnetizing member 38 can conduct magnetic lines of force between the second wall 31b and the second protrusion 362.

[0214] For example, in this embodiment, a magnetizing element 38 may also be provided. Taking the magnetizing element 38 having a through hole 38a as an example. In some embodiments, the magnetizing element 38 includes a collar 381, which is fitted onto the second protrusion 362 and abuts against the inner surface of the second wall 31b. Alternatively, the magnetizing element 38 includes a collar 381 and a protruding edge 382, ​​with the collar 381 fitted onto the second protrusion 362, and the protruding edge 382 surrounding the collar 381 and abutting against the inner surface of the second wall 31b. The thickness of the protruding edge 382 in the direction of the centerline of the collar 381 is greater than the wall thickness of the collar 381. Alternatively, the magnetizing component 38 includes a collar 381 and a protruding edge 382. The collar 381 is fitted onto the second protrusion 362, and the protruding edge 382 is arranged around the periphery of the collar 381 and abuts against the outer surface of the second wall 31b. The thickness of the protruding edge 382 in the direction of the centerline of the collar 381 is less than the wall thickness of the collar 381. Regarding the assembly method and effect of the magnetizing component 38 between the second stationary iron core 36 and the second wall 31b, please refer to the embodiment of the magnetizing component 38 between the first stationary iron core 33 and the second wall 31b, which will not be repeated here.

[0215] Second Embodiment

[0216] In addition, in related technologies, the yoke assembly conducts electromagnetic wires to the moving iron core, causing the moving iron core to be magnetized and generate an electromagnetic force that attracts it to the other side of the yoke assembly.

[0217] However, the electromagnetic force of the moving iron core in the related technology is relatively small, and increasing the number of coil turns or increasing the volume of the moving iron core will lead to an increase in the size of the relay, which is not conducive to the miniaturization of the relay.

[0218] Therefore, in order to address the issue of how to improve the electromagnetic force of the moving iron core while miniaturizing the moving relay, this application also provides a magnetic circuit part of the relay and the relay itself.

[0219] On one hand, this application provides a magnetic circuit portion of a relay, the magnetic circuit portion comprising:

[0220] A yoke assembly, wherein the yoke assembly encloses and forms a receiving space, and the yoke assembly is provided with a through hole for inserting a push rod;

[0221] A movable iron core is located within the receiving space, and the movable iron core is used to drive the push rod to move axially relative to the yoke assembly;

[0222] A stationary magnetic conductor is located within the receiving space, and magnetic lines of force can be conducted between the stationary magnetic conductor and the moving iron core.

[0223] A magnetizing element is disposed between the static magnetic conductor and the yoke assembly, and is capable of conducting magnetic lines of force between the yoke assembly and the static magnetic conductor.

[0224] The magnetic circuit of the aforementioned relay increases the magnetic flux conducted from the yoke assembly to the stationary magnetic conductor by converging magnetic lines of force through the magnetizing component. This allows the stationary magnetic conductor to conduct more magnetic lines of force to the moving iron core, thereby enhancing the electromagnetic force of the moving iron core. Furthermore, this structural design does not require increasing the volume of the moving iron core, thus contributing to the miniaturization of the relay. Therefore, the magnetic circuit of this application can simultaneously achieve relay miniaturization and enhance the electromagnetic force of the moving iron core.

[0225] In one embodiment, the static magnetic conductor includes a protrusion, and the magnetizing component has a through hole. The magnetizing component is sleeved on the protrusion, and the inner wall of the through hole contacts the peripheral sidewall of the protrusion. The magnetizing component can conduct magnetic lines of force between the second wall and the protrusion. In this embodiment, the cooperation between the protrusion and the magnetizing component not only enables the conduction of magnetic lines of force between the static magnetic conductor and the magnetizing component, but also allows the assembly allowance between the two components to be utilized to reduce the assembly stress present when directly assembling the static magnetic conductor to the yoke assembly by sleeved the magnetizing component on the protrusion.

[0226] In one embodiment, the stationary magnetic conductor includes a first stationary iron core, which includes a main body and a first protrusion. Magnetic lines of force can be conducted between the main body and the moving iron core. The first protrusion protrudes from the end face of the main body facing away from the moving iron core. The magnetizing component has a through hole and is sleeved on the first protrusion. The inner wall of the through hole contacts the peripheral side wall of the first protrusion. The magnetizing component can conduct magnetic lines of force between the yoke assembly and the first protrusion. Because the magnetizing component is sleeved on the first protrusion of the first stationary iron core, it occupies little space, thus helping to maintain the miniaturization of the relay. Therefore, adopting the magnetic circuit portion of this application can simultaneously achieve miniaturization of the moving relay and improve the electromagnetic force of the moving iron core.

[0227] In one embodiment, the yoke assembly includes a first wall and a second wall disposed opposite to each other, the perforation is provided on the first wall, the second wall is provided with an insertion hole, and the first protrusion extends into the insertion hole, thereby enabling the first protrusion and the second wall to conduct magnetic lines of force.

[0228] In one embodiment, the magnetizing element includes a collar sandwiched between the main body and the second wall.

[0229] In one embodiment, the magnetizing component includes a collar and a protruding edge. The protruding edge is disposed around the periphery of the collar. The collar is sandwiched between the peripheral side wall of the first protrusion and the inner wall of the insertion hole. The protruding edge is sandwiched between the main body and the second wall. The thickness of the protruding edge in the direction of the center line of the insertion hole is greater than the wall thickness of the collar.

[0230] In one embodiment, the magnetizing component includes a collar and a protruding edge. The protruding edge is disposed around the periphery of the collar. The collar is sandwiched between the peripheral sidewall of the first protrusion and the inner wall of the insertion hole. The protruding edge abuts against the outer surface of the second wall along the wall thickness direction of the second wall. The thickness of the protruding edge in the centerline direction of the insertion hole is less than the wall thickness of the collar.

[0231] In one embodiment, the stationary magnetic conductor includes a first stationary iron core and a second stationary iron core, and the moving iron core is disposed between the first stationary iron core and the second stationary iron core along the axial direction of the push rod.

[0232] In one embodiment, the yoke assembly includes a first wall and a second wall disposed opposite to each other. The through hole is provided in the first wall, and the second wall has an insertion hole. The second stationary iron core includes a second protrusion. The magnetizing member has a through hole and is sleeved on the second protrusion. The inner wall of the through hole contacts the peripheral side wall of the second protrusion. The magnetizing member can conduct magnetic lines of force between the second wall and the second protrusion. Since the magnetizing member is sleeved on the second protrusion of the second stationary iron core, it occupies little space, which is beneficial to maintaining the miniaturization of the relay. Therefore, adopting the magnetic circuit part of this application can achieve both miniaturization of the moving relay and improvement of the electromagnetic force of the moving iron core.

[0233] In one embodiment, the magnetizing element includes a collar that is fitted onto the second protrusion and abuts against the inner surface of the second wall.

[0234] In one embodiment, the magnetizing element includes a collar and a protruding edge. The collar is sleeved on the second protrusion, and the protruding edge is disposed around the periphery of the collar and abuts against the inner surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is greater than the wall thickness of the collar.

[0235] In one embodiment, the magnetizing element includes a collar and a protruding edge. The collar is sleeved on the second protrusion, and the protruding edge is disposed around the periphery of the collar and abuts against the outer surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is less than the wall thickness of the collar.

[0236] In one embodiment, the moving iron core includes a first convex ring portion axially arranged around the push rod. A recessed portion is provided at one end of the first stationary iron core facing the moving iron core. The first convex ring portion extends into the recessed portion, and magnetic lines of force can be conducted between the peripheral sidewall of the recessed portion and the outer sidewall of the first convex ring portion. In this embodiment, because magnetic lines of force can be conducted between the peripheral sidewall of the recessed portion and the outer sidewall of the first convex ring portion, magnetic lines of force can be stably conducted between the first stationary iron core and the moving iron core during the movement of the moving iron core relative to the first stationary iron core.

[0237] In one embodiment, the moving iron core includes a first convex ring portion axially arranged around the push rod. A portion of the structure of the first stationary iron core is housed within the space enclosed by the first convex ring portion. Magnetic lines of force can be conducted between the peripheral sidewall of the first stationary iron core and the inner sidewall of the first convex ring portion. With this arrangement, magnetic lines of force can be stably conducted between the first stationary iron core and the moving iron core during the movement of the moving iron core relative to the first stationary iron core.

[0238] In one embodiment, the end of the first stationary iron core facing the moving iron core has a recess, and at least a portion of the structure of the moving iron core is housed in the recess. This arrangement improves the tightness of the fit between the moving iron core and the first stationary iron core, thereby reducing the overall size of the relay and facilitating weight reduction.

[0239] In one embodiment, the moving iron core includes a connecting portion for connecting the push rod, and at least a portion of the connecting portion is housed within the recess. In this embodiment, the recess allows for the housing of at least a portion of the connecting portion, resulting in a more compact structure between the moving iron core and the first stationary iron core while ensuring magnetic conductivity, thereby reducing the overall size of the relay and facilitating weight reduction.

[0240] In one embodiment, the moving iron core includes a second convex ring portion, a portion of which is housed within the recessed portion. Thus, the first and second convex ring portions are complementaryly embedded with the main body, further enhancing the guiding effect of the first stationary iron core on the moving iron core, thereby improving the motion stability of the moving iron core in the electromagnetic field generated by the coil.

[0241] In one embodiment, the magnetic circuit portion of the relay further includes a magnetic guide cylinder, within which at least a portion of the moving iron core and at least a portion of the first stationary iron core are located. The magnetic guide cylinder is used to converge the magnetic lines of force generated by the energized coil assembly to the periphery of the first stationary iron core. In this embodiment, the magnetic guide cylinder can be used to converge the magnetic lines of force generated by the energized coil to the periphery of the first stationary iron core, facilitating the conduction of the magnetic lines of force from the first stationary iron core to the moving iron core.

[0242] In one embodiment, the system further includes a metal shell, the magnetic cylinder is fitted onto the metal shell, the moving iron core is located inside the metal shell, and at least a portion of the structure of the first stationary iron core is located inside the metal shell.

[0243] On the other hand, this application provides a relay, including the magnetic circuit portion of the relay as described above.

[0244] As shown in Figures 17 and 18, this application provides a relay 100 that can be applied in automatic control circuits.

[0245] The relay 100 includes a contact portion 10, an actuation mechanism 20, and a magnetic circuit portion 30.

[0246] 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.

[0247] 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.

[0248] The relay 100 also includes a coil assembly 40 with a mounting hole 40a. The coil assembly 40 includes a coil 41, which generates an electromagnetic field when energized. The magnetic circuit portion 30 provides magnetic conductivity and, under the influence of the electromagnetic field generated by the coil 41, drives the push rod 22 to move, thereby bringing the moving contact 12 on the push base 21 into contact with the stationary contact 11. Thus, the opening and closing of the relay 100 can be controlled by energizing the coil 41, 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.

[0249] Continuing with Figures 17 and 18, the magnetic circuit section 30 includes a yoke assembly 31 and a moving iron core 32.

[0250] The magnetic circuit section 30 also includes a structure corresponding to the moving iron core 32 in the direction of movement of the moving iron core 32, used to conduct magnetic lines of force between the moving iron core 32 and the yoke assembly 31. For ease of understanding, this type of structure capable of conducting magnetic lines of force with the moving iron core 32 is referred to as a "static magnetic conductor". In this embodiment, the static magnetic conductor is located within the receiving space enclosed by the yoke assembly 31, and magnetic lines of force can be conducted between the static magnetic conductor and the moving iron core 32.

[0251] It should be noted that the static magnetic conductor can be a single magnetic structure or a combination of two or more magnetic structures. For example, referring to Figure 19, in some embodiments, the static magnetic conductor includes a first static iron core 33. As another example, referring to Figure 20, in some embodiments, the static magnetic conductor includes a first static iron core 33 and a second static iron core 36.

[0252] In an embodiment where the stationary magnetic conductor includes a first stationary iron core 33 and a second stationary iron core 36, the first stationary iron core 33 and the second stationary iron core 36 may be respectively disposed on different sides of the moving iron core 32, that is, the moving iron core 32 may be located between the first stationary iron core 33 and the second stationary iron core 36. In this embodiment, the positions of the first stationary iron core 33 and the second stationary iron core 36 relative to the moving iron core 32 can be interchanged, and the first stationary iron core 33 and the second stationary iron core 36 are adapted to be able to conduct magnetic lines of force between the moving iron core 32 and the yoke assembly 31.

[0253] For ease of explanation, the following will describe the embodiments of the static magnetic conductor including the first static iron core 33 and the embodiments of the static magnetic conductor including the first static iron core 33 and the second static iron core 36.

[0254] In some embodiments, the moving iron core 32, the first stationary iron core 33, and the coil 41 are all located within the space enclosed by the yoke assembly 31.

[0255] 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 so as to connect with the moving iron core 32 located inside the yoke assembly 31. The moving iron core 32 is used to drive the push rod 22 to move axially relative to the yoke assembly 31, thereby causing the push rod 22 to move the push seat 21 closer to or away from the stationary contact 11, so that the moving contact piece 12 on the push seat 21 contacts or separates from the stationary contact 11.

[0256] The moving iron core 32 is located in the mounting hole 40a. When the coil 41 is energized, the electromagnetic field generated causes the moving iron core 32 to be magnetized and attracted to the side wall of the yoke assembly 31 near the moving contact 12. In this way, the moving iron core 32 drives the push seat 21 to move toward the stationary contact 11 via the push rod 22, so that the moving contact 12 on the push seat 21 comes into contact with the stationary contact 11.

[0257] In some embodiments, the yoke assembly 31 includes a yoke plate 311 and a U-shaped yoke 312, with a through hole 31c provided in the yoke plate 311. The yoke plate 311 is connected to both ends of the U-shaped yoke 312, and the through hole 31c is provided in the yoke plate 311. The push 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 push 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.

[0258] Furthermore, a return spring 35 is provided between the yoke plate 311 and the moving iron core 32.

[0259] When coil 41 is energized, the moving iron core 32 is magnetized and attracts the yoke plate 311. Therefore, the moving iron core 32 overcomes the elastic force of the return spring 35 and moves towards the yoke plate 311, thereby pushing rod 22 to drive push seat 21 towards the stationary contact 11, causing the moving contact piece 12 on push seat 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.

[0260] When the coil 41 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.

[0261] In some embodiments, the first stationary iron core 33 is disposed on the inner wall of the yoke assembly 31 opposite to the yoke plate 311. Thus, when the coil 41 is de-energized, the reset spring 35 drives the moving iron core 32 to reset in a direction away from the yoke plate 311, that is, the reset spring 35 drives the moving iron core 32 to reset towards the first stationary iron core 33.

[0262] 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.

[0263] 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.

[0264] For example, in some embodiments, the yoke assembly 31 includes a first yoke plate, a second yoke plate, and two side yoke plates. The two side yoke plates are spaced apart from each other and are both connected between the first yoke plate and the second yoke plate, thus forming a closed ring structure with the first yoke plate, the second yoke plate, and the two side yoke plates. In this embodiment, the through hole 31c is provided on either the first yoke plate or the second yoke plate, as long as the through hole 31c can accommodate the insertion of the push rod 22.

[0265] 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.

[0266] Referring to Figures 18 and 19, 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.

[0267] In some embodiments, a first stationary iron core 33 is disposed on a second wall 31b, and magnetic lines of force can be conducted between the first stationary iron core 33 and the second wall 31b. Thus, the magnetic lines of force of the yoke assembly 31 are conducted to the first stationary iron core 33 at the second wall 31b, thereby enabling the first stationary iron core 33 to conduct the magnetic lines of force to the moving iron core 32 so that the moving iron core 32 is magnetized.

[0268] Taking the relay 100 shown in Figures 18 and 19 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. 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.

[0269] In some embodiments, the coil assembly 40 further includes a coil frame 42, which has a mounting hole 40a in its middle. The two ends of the coil frame 42 abut against a first wall 31a and a second wall 31b, respectively, so that the wall of the mounting hole 40a encloses the first wall 31a and the second wall 31b to form an assembly space. Structures such as the moving iron core 32 and the first stationary iron core 33 are disposed within this assembly space. In this embodiment, the mounting hole 40a is used to enclose the assembly space between the first wall 31a and the second wall 31b to accommodate the installation needs of structures such as the moving iron core 32 and the first stationary iron core 33.

[0270] The coil 41 is wound around the coil frame 42 to surround the moving iron core 32 and the first stationary iron core 33 located in the mounting hole 40a. When the coil 41 is energized, the moving iron core 32 and the first stationary iron core 33 conduct magnetism between the first wall 31a and the second wall 31b of the yoke assembly 31, causing the moving iron core 32 to be magnetized and magnetically attracted to the first wall 31a. 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.

[0271] 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.

[0272] For example, as shown in Figures 18 and 19, in some embodiments, the relay 100 further includes an insulating cover 50 disposed above the yoke plate 311. Two stationary contacts 11 are respectively disposed through the top wall of the insulating cover 50, and the moving contact 12 and the push base 21 are connected and both are disposed inside the insulating cover 50. Since the push rod 22 is disposed through the through hole 31c and 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 moving in the mounting hole 40a of the coil frame 42 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.

[0273] Magnetic lines of force can be conducted between one end of the first stationary iron core 33 and the yoke assembly 31, and magnetic lines of force can be conducted between the other end and the moving iron core 32.

[0274] 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 the other object. 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.

[0275] Taking the conduction of magnetic field lines between the first stationary iron core 33 and the yoke assembly 31 as an example, the first stationary iron core 33 can achieve magnetic conduction between the two by contacting the yoke assembly 31. In some embodiments, there may also be a magnetically conductive gap between the first stationary iron core 33 and the yoke assembly 31. Whether the magnetically conductive gap is filled with air or other magnetically conductive media is provided, as long as the gap between the first stationary iron core 33 and the yoke assembly 31 meets the magnetic conduction requirements, it is acceptable.

[0276] Referring to Figure 20, in the embodiment where the stationary magnetic conductor includes a first stationary iron core 33 and a second stationary iron core 36, the second stationary iron core 36 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 second stationary iron core 36, thereby providing a greater driving force for the axial movement of the push rod 22.

[0277] In another embodiment, the second stationary iron core 36 may be connected to the second wall 31b, and the first stationary iron core 33 may be connected to the first wall 31a, that is, the positions of the first stationary iron core 31a and the second stationary iron core 36 in the yoke assembly 31 are interchanged.

[0278] Referring again to Figure 20, in an embodiment where the magnetic circuit portion 30 includes a second stationary iron core 36, the return spring 35 may be disposed between the second stationary iron core 36 and the moving iron core 32. For example, the second stationary iron core 36 may have a supporting portion 361, which is used to elastically engage with the moving iron core 32 via the return spring 35. The push rod 22 passes through the return spring 35 and the supporting portion 361. Thus, when the coil 41 is energized, the moving iron core 32 is magnetized and attracts the second stationary iron core 36, causing the push rod 22 to move the push seat 21 toward the side where the stationary contact 11 is located, thereby enabling the moving contact piece 12 on the push seat 21 to contact the stationary contact 11. When the energization to coil 41 is disconnected, the moving iron core 32 loses its magnetism or its magnetic force weakens. The elastic force of the return spring 35 drives the moving iron core 32 to return to its original position, that is, the moving iron core 32 moves away from the second stationary iron core 36, which in turn causes the push rod 22 to bring the push seat 21 closer to the first wall 31a. In this way, the moving contact 12 on the push seat 21 moves away from the stationary contact 11.

[0279] Referring to Figure 22, in some embodiments, the magnetic circuit portion 30 of the relay 100 further includes a magnetic guide cylinder 37, within which at least a portion of the moving iron core 32 and at least a portion of the first stationary iron core 33 are located. In this embodiment, the magnetic guide cylinder 37 can be used to concentrate the magnetic lines of force generated by the energized coil 41 to the periphery of the first stationary iron core 33, thereby facilitating the conduction of the magnetic lines of force from the first stationary iron core 33 to the moving iron core 32.

[0280] In some embodiments, the magnetic cylinder 37 is located within the mounting hole 40a. The magnetic cylinder 37 and the second wall 31b are capable of conducting magnetic lines of force.

[0281] In some embodiments, continuing with reference to Figures 20 and 21, the first stationary iron core 33 includes a main body portion 33a and a first protrusion portion 33b connected together. The first protrusion portion 33b protrudes from the end face of the main body portion 33a facing away from the moving iron core 32. The first protrusion portion 33b and the second wall 31b can conduct magnetic lines of force, that is, when the coil 41 is energized and generates an electromagnetic field, the magnetic lines of force in the second wall 31b can be conducted to the first protrusion portion 33b, and then to the main body portion 33a via the first protrusion portion 33b.

[0282] For example, in some embodiments, the second wall 31b is provided with a socket 31d, and the first protrusion 33b extends into the socket 31d. In this embodiment, the first protrusion 33b extends into the socket 31d, thereby enabling the first protrusion 33b and the second wall 31b to conduct magnetic lines of force.

[0283] It should be noted that the first protrusion 33b may be in contact with the second wall 31b or there may be a magnetic gap between them, as long as the second wall 31b can conduct magnetic lines of force to the first protrusion 33b to meet the needs of the first stationary iron core 33 to receive magnetic lines of force.

[0284] Referring again to Figures 18 and 19, in some embodiments, the magnetic circuit portion 30 further includes a magnetizing element 38, which is disposed between the stationary magnetic conductor and the yoke assembly 31. In this embodiment, the magnetizing element 38 can conduct magnetic lines of force between the yoke assembly 31 and the stationary magnetic conductor. By utilizing the converging effect of the magnetizing element 38 on the magnetic lines of force, the magnetic flux conducted from the yoke assembly 31 to the moving iron core 32 via the stationary magnetic conductor is enhanced, thereby increasing the electromagnetic force of the moving iron core 32. Furthermore, this structural arrangement does not require increasing the volume of the moving iron core 32, thus contributing to the miniaturization of the relay 100. Therefore, by adopting the magnetic circuit portion 30 of this application, it is possible to simultaneously achieve relay miniaturization and improve the electromagnetic force of the moving iron core 32.

[0285] Furthermore, the static magnetic conductor includes a protrusion, and the magnetizing component 38 has a through hole 38a. The magnetizing component 38 is sleeved on the protrusion, and the inner wall of the through hole 38a contacts the peripheral side wall of the protrusion. The magnetizing component 38 can conduct magnetic lines of force between the second wall 31b and the protrusion. In this embodiment, the cooperation between the protrusion and the magnetizing component 38 not only enables the conduction of magnetic lines of force between the static magnetic conductor and the magnetizing component 38, but also allows the assembly allowance between the two components to be used to reduce the assembly stress that exists when directly assembling the static magnetic conductor to the yoke assembly 31.

[0286] It should be noted that the static magnetic conductor can include either a first static iron core 33 or a second static iron core 36. In the embodiment where the static magnetic conductor includes a first static iron core 33 and a second static iron core 36, one of the first static iron core 33 and the second static iron core 36 can be disposed on the first wall 31a, and the other on the second wall 31b. Correspondingly, in the embodiment where the static magnetic conductor includes a protrusion, the protrusion can be disposed on the first static iron core 33 (e.g., the first protrusion 33b) or on the second static iron core 36 (e.g., the second protrusion in an embodiment where the second static iron core 36 includes a second protrusion). Therefore, there are various embodiments in which the magnetizing member 38 conducts the magnetic lines of force from the yoke assembly 31 to the static magnetic conductor.

[0287] For example, the first stationary iron core 33 is disposed on the side of the moving iron core 32 near the second wall 31b, and the magnetizing element 38 can play the role of conducting magnetic lines of force between the second wall 31b and the first stationary iron core 33.

[0288] For example, the second stationary iron core 36 is disposed on the side of the moving iron core 32 near the second wall 31b, and the magnetizing element 38 can conduct magnetic lines of force between the second wall 31b and the second stationary iron core 36. In this embodiment, the first stationary iron core 33 can be disposed between the first wall 31a and the moving iron core 32, so that magnetic lines of force can be conducted between the moving iron core 32 and the first wall 31a through the first stationary iron core 33.

[0289] It should be noted that in the embodiment where the magnetizing element 38 can conduct magnetic lines of force between the second wall 31b and the first stationary iron core 33, there are multiple possibilities for the cooperation between the first stationary iron core 33 and the magnetizing element 38.

[0290] For example, in an embodiment where the first stationary iron core 33 includes a connected main body portion 33a and a first protrusion portion 33b, the magnetizing member 38 is provided with a through hole 38a. The magnetizing member 38 is sleeved on the first protrusion portion 33b, the inner wall of the through hole 38a is in contact with the peripheral side wall of the first protrusion portion 33b, and the magnetizing member 38 is in contact with the second wall 31b. In this embodiment, the magnetizing member 38 enhances the magnetic flux conducted from the second wall 31b to the first stationary iron core 33 by utilizing the converging effect of the magnetic lines of force. As a result, the first stationary iron core 33 conducts more magnetic lines of force to the moving iron core 32, thereby improving the electromagnetic force of the moving iron core 32. Since the magnetizing member 38 is sleeved on the first protrusion portion 33b of the first stationary iron core 33, it occupies little space, which is beneficial for maintaining the miniaturization of the relay 100. Therefore, by adopting the magnetic circuit portion 30 of this application, it is possible to improve the electromagnetic force of the moving iron core 32 while simultaneously achieving the miniaturization of the moving relay 100.

[0291] Furthermore, when the first stationary iron core 33 is assembled to the second wall 31b, the magnetizing element 38 can absorb assembly stress between the first stationary iron core 33 and the second wall 31b to improve the connection stability between the second stationary iron core 36 and the second wall 31b.

[0292] In some embodiments, the magnetizing element 38 may not have a through hole 38a. For example, the magnetizing element 38 is sheet-shaped and sandwiched between the first stationary iron core 33 and the second wall 31b. In this way, the magnetizing element 38 can also conduct magnetic lines of force between the second wall 31b and the first stationary iron core 33, thereby enhancing the magnetic flux conducted between them. At the same time, the magnetizing element 38 can also absorb the assembly tolerance between the first stationary iron core 33 and the second wall 31b along the axial direction of the push rod 22.

[0293] It should be noted that the structure of the magnetizing component 38 can be implemented in various ways, and correspondingly, the assembly method of the magnetizing component 38 between the second wall 31b and the first stationary iron core 33 can also be varied. For ease of understanding, the magnetic circuit portion 30 will be described below with reference to the structure of the magnetizing component 38, but this does not mean that the structure and assembly method of the magnetizing component 38 are limited to this.

[0294] For example, as shown in Figure 23, the magnetizing component 38 includes a collar 381 and a protruding edge 382. The protruding edge 382 is disposed around the periphery of the collar 381, and the collar 381 is sandwiched between the peripheral sidewall of the first protrusion 33b and the inner wall of the insertion hole 31d. The protruding edge 382 abuts against the outer surface of the second wall 31b along the wall thickness direction of the second wall 31b, and the thickness of the protruding edge 382 in the direction of the centerline of the insertion hole 31d is less than the wall thickness of the collar 381.

[0295] In the embodiment where the magnetizing element 38 includes a collar 381 and a protruding edge 382, ​​the magnetizing element 38 can also be configured as follows. Specifically, referring to FIG24, the magnetizing element 38 includes a collar 381 and a protruding edge 382. The protruding edge 382 is arranged around the periphery of the collar 381, the collar 381 is sandwiched between the peripheral sidewall of the first protrusion 33b and the inner wall of the insertion hole 31d, and the protruding edge 382 is sandwiched between the main body 33a and the second wall 31b. The thickness of the protruding edge 382 in the direction of the centerline of the insertion hole 31d is greater than the wall thickness of the collar 381, so as to increase the surface area of ​​the magnetizing element 38 facing the first protrusion 33b, increase the magnetic flux conducted by the magnetizing element 38 to the first stationary iron core 33, thereby facilitating the increase of the magnetic flux conducted through the first stationary iron core 33 to the moving iron core 32. Therefore, the relay 100 of this application embodiment does not need to increase the number of coil turns 41 or increase the pull-in voltage. The electromagnetic force of the moving iron core 32 can be increased by using the magnetizing element 38, so that the relay 100 can reduce the pull-in voltage while achieving miniaturization.

[0296] It should be noted that if there are machining errors during the processing of the yoke assembly 31, resulting in poor coaxiality between the through hole 31c and the insertion hole 31d, then when assembling the first protrusion 33b into the insertion hole 31d, the diameter of the insertion hole 31d needs to be increased to facilitate its fit with the first protrusion 33b. Otherwise, the first protrusion 33b may easily interfere with the inner wall of the insertion hole 31d, causing assembly difficulties or generating assembly stress. In the embodiment of this application, since the collar 381 is sandwiched between the peripheral sidewall of the first protrusion 33b and the inner wall of the insertion hole 31d, a certain assembly gap is allowed between the collar 381 and the peripheral sidewall of the first protrusion 33b, and also between the collar 381 and the insertion hole 31d. In this way, the collar 381 can be used to absorb the assembly tolerance when the first protrusion 33b is assembled into the insertion hole 31d, reduce the assembly stress, and thus improve the assembly stability between the first stationary iron core 33 and the second wall 31b.

[0297] Furthermore, the assembly gap between the collar 381 and the peripheral sidewall of the first protrusion 33b is smaller than the assembly gap between the collar 381 and the insertion hole 31d. In other words, regarding these two assembly gaps, the assembly gap between the collar 381 and the peripheral sidewall of the first protrusion 33b is relatively small, which helps improve the magnetic conductivity between them. Correspondingly, the assembly gap between the collar 381 and the insertion hole 31d is relatively large, which helps to utilize the collar 381 to absorb the assembly tolerance when the first protrusion 33b is assembled into the insertion hole 31d, thus reducing assembly stress.

[0298] In some embodiments, the magnetizing element 38 may also have other structures. For example, as shown in FIG26, the magnetizing element 38 includes a collar 381, which is sandwiched between the main body 33a and the second wall 31b.

[0299] It should be noted that in the embodiment where the static magnetic conductor includes a first static iron core 33 and a second static iron core 36, after the positions of the second static iron core 36 and the first static iron core 33 relative to the moving iron core 32 are interchanged, the second static iron core 36 cooperates with the magnetizing component 38. The cooperation method between the second static iron core 36 and the magnetizing component 38 can refer to the cooperation method between the first static iron core 33 and the magnetizing component 38 in the above embodiment.

[0300] The relevant structures of the first stationary iron core 33, the second stationary iron core 36, and the moving iron core 32 can be adjusted according to the usage requirements of the relay 100. The specific structure of the first stationary iron core 33 and the moving iron core 32, as well as the structural arrangement for transmitting magnetic field lines between them, can be referred to the above-described implementation where the first stationary iron core 33 is positioned between the second wall 31b and the moving iron core 32; further details will not be elaborated here.

[0301] For example, in an embodiment where the second stationary iron core 36 is disposed between the first wall 31a and the moving iron core 32, the second stationary iron core 36 includes a second protrusion. The magnetizing member 38 is provided with a through hole 38a, and the magnetizing member 38 is sleeved on the second protrusion. The inner wall of the through hole 38a is in contact with the peripheral side wall of the second protrusion, and the magnetizing member 38 can conduct magnetic lines of force between the second wall 31b and the second protrusion.

[0302] For example, in some embodiments, the magnetizing element 38 includes a collar 381, which is fitted onto the second protrusion and abuts against the inner surface of the second wall 31b. Alternatively, the magnetizing element 38 includes a collar 381 and a protruding edge 382, ​​with the collar 381 fitted onto the second protrusion and the protruding edge 382 surrounding the circumference of the collar 381 and abutting against the inner surface of the second wall 31b, wherein the thickness of the protruding edge 382 in the direction of the centerline of the collar 381 is greater than the wall thickness of the collar 381. Alternatively, the magnetizing element 38 includes a collar 381 and a protruding edge 382, ​​with the collar 381 fitted onto the second protrusion and the protruding edge 382 surrounding the circumference of the collar 381 and abutting against the outer surface of the second wall 31b, wherein the thickness of the protruding edge 382 in the direction of the centerline of the collar 381 is less than the wall thickness of the collar 381.

[0303] Furthermore, the assembly gap between the collar 381 and the peripheral sidewall of the second protrusion is smaller than the assembly gap between the collar 381 and the insertion hole 31d. In other words, regarding these two assembly gaps, the smaller gap between the collar 381 and the peripheral sidewall of the second protrusion improves the magnetic conductivity between them; correspondingly, the larger gap between the collar 381 and the insertion hole 31d allows the collar 381 to absorb the assembly tolerances when the second protrusion is assembled into the insertion hole 31d, reducing assembly stress.

[0304] Regarding the assembly method and effect of the magnetizing component 38 between the second stationary iron core 36 and the second wall 31b, please refer to the implementation method of the magnetizing component 38 between the first stationary iron core 33 and the second wall 31b, which will not be repeated here.

[0305] In some embodiments, as shown in FIG2, the magnetic circuit portion 30 includes a metal shell 34 disposed within the space enclosed by the yoke assembly 31. The metal shell 34 has a cylindrical structure that is axially enclosed around the push rod 22. The moving iron core 32 is located within the metal shell 34, and at least a portion of the first stationary iron core 33 is located within the metal shell 34. Understandably, since the metal shell 34 is located within the space enclosed by the yoke assembly 31, the portions of the moving iron core 32 and the stationary iron core located within the metal shell 34 are also located within the space enclosed by the yoke assembly 31.

[0306] It should be noted that the coil 41 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 41 is energized causes the moving iron core 32 to be magnetized and attracted to the side wall of the yoke assembly 31 near the moving contact 12. Thus, the moving iron core 32 drives the push seat 21 to move toward the stationary contact 11 via the push rod 22, so that the moving contact 12 on the push seat 21 comes into contact with the stationary contact 11.

[0307] Understandably, in embodiments where the relay 100 includes a metal housing 34 and a magnetic cylinder 37, the magnetic cylinder 37 is sleeved on the outside of the metal housing 34, that is, the magnetic cylinder 37 is located between the inner wall of the mounting hole 40a and the outer wall of the metal housing 34.

[0308] In some embodiments, the metal shell 34 includes a tube 341 and an inner flange 342 and an outer flange 343 connected to both ends of the tube 341. The inner flange 342 protrudes from the inner wall of the tube 341, and the outer flange 343 protrudes from the outer wall of the tube 341. In this embodiment, the arrangement of the inner flange 342 and the outer flange 343 facilitates the connection of both ends of the metal shell 34 to corresponding structural components by welding. For example, the inner flange 342 is welded to the first stationary iron core 33. The outer flange 343 is welded to the first wall 31a.

[0309] In some embodiments, one end of the tube body 341 is sealed to the first stationary iron core 33 via an inner folded edge 342, and the other end of the tube body 341 is sealed to the first wall 31a via an outer folded edge 343. Since the first wall 31a has a perforation 31c, the space where the contact portion 10 is located is connected to the space enclosed by the metal shell 34 through the perforation 31c. Therefore, the two ends of the metal shell 34 are sealed to the corresponding structural components, which enhances the sealing performance of the space where the contact portion 10 is located.

[0310] It should be noted that the inner folded edge 342 and the outer folded edge 343 of the metal shell 34 may be omitted. For example, in some embodiments, the metal shell 34 includes a connected tube body 341 and an inner folded edge 342, the inner folded edge 342 protruding from the inner wall of the tube body 341, one end of the tube body 341 being sealed to the first wall 31a, and the other end being sealed to the first stationary iron core 33 through the inner folded edge 342. As another example, the metal shell 34 includes a connected tube body 341 and an outer folded edge 343, the outer folded edge 343 protruding from the outer wall of the tube body 341, one end of the tube body 341 being sealed to the first wall 31a through the outer folded edge 343, and the other end being sealed to the first stationary iron core 33.

[0311] It should be noted that in the embodiment where the stationary magnetic conductor includes a first stationary iron core 33 and a second stationary iron core 36, the metal shell 34 can be sealed and welded to the first stationary iron core 33 as described above. After the positions of the first stationary iron core 33 and the second stationary iron core 36 relative to the moving iron core 32 are interchanged, the second stationary iron core 36 can be sealed and welded to the metal shell 34 in a similar manner. For details, please refer to the connection method between the first stationary iron core 33 and the metal shell 34 described above, which will not be repeated here.

[0312] The structural arrangement of the metal shell 34 in the relay 100 will be further explained below with reference to the structure of the first stationary iron core 33. For example, in an embodiment where the first stationary iron core 33 includes a connected main body 33a and a first protrusion 33b, and the metal shell 34 includes a connected tube 341 and an inner folded edge 342, one end of the tube 341 is connected to the first wall 31a, and the other end is fitted around the outer periphery of the main body 33a. The inner folded edge 342 is sandwiched between the main body 33a and the magnetizing member 38, thereby stably mounting the metal shell 34 between the first wall 31a and the second wall 31b.

[0313] It should be noted that the metal casing 34 is not essential; that is, in some embodiments, the metal casing 34 can be omitted, thereby freeing up space to wind a coil 41 with more turns, thus increasing the switching voltage without increasing the size of the relay 100. Of course, the number of coil turns can also be omitted. Because there is no metal casing 34, the mounting hole 40a of the coil assembly 40 and its surrounding structure can be recessed inwards as a whole, thereby reducing the size of the relay 100 and achieving miniaturization.

[0314] The structure of the first stationary iron core 33 and the moving iron core 32, as well as the way in which magnetic lines of force can be transmitted between them, are not specified here.

[0315] In some embodiments, the moving iron core 32 and the first stationary iron core 33 have an overlapping portion in the axial direction perpendicular to the push rod 22.

[0316] As shown in Figure 24, the moving iron core 32 includes a first protruding ring portion 321, which is axially arranged around the push rod 22.

[0317] In some embodiments, a portion of the structure of the first stationary iron core 33 is housed within the space enclosed by the first convex ring portion 321. Magnetic lines of force can be conducted between the peripheral sidewall of the first stationary iron core 33 and the inner sidewall of the first convex ring portion 321, thereby ensuring stable magnetic line conduction between the first stationary iron core 33 and the moving iron core 32 during movement relative to the first stationary iron core 33. Further, continuing with FIG. 24, in embodiments where the first stationary iron core 33 includes a connected main body portion 33a and a first protrusion portion 33b, a portion of the structure of the main body portion 33a is housed within the space enclosed by the first convex ring portion 321. In this embodiment, the peripheral sidewall of the main body portion 33a and the inner sidewall of the first convex ring portion 321 can conduct magnetic lines of force. Since part of the structure of the main body 33a is housed within the space enclosed by the first convex ring 321, the main body 33a can transmit magnetic lines of force to the first convex ring 321. This enables the first stationary iron core 33 to transmit the magnetic lines of force of the second wall 31b to the moving iron core 32, so that the moving iron core 32 can be magnetized and attract the first wall 31a or the second stationary iron core 36 located on the first wall 31a. This achieves the purpose of the moving iron core 32 driving the push seat 21 to approach the stationary contact 11 via the push rod 22, so that the moving contact piece 12 on the push seat 21 can contact the stationary contact 11.

[0318] As shown in Figure 25, a recessed portion 331 is provided at one end of the main body 33a facing the moving iron core 32. At least a portion of the structure of the moving iron core 32 is accommodated in the recessed portion 331. This arrangement can improve the tightness of the fit between the moving iron core 32 and the first stationary iron core 33, thereby reducing the overall size of the relay 100 and facilitating weight reduction.

[0319] Furthermore, referring to Figure 27, the moving iron core 32 includes a connecting portion 323 for connecting the push rod 22, and at least a portion of the structure of the connecting portion 323 is located in the recessed portion 331. In this embodiment, the recessed portion 331 can accommodate at least a portion of the structure of the connecting portion 323, thereby making the structure between the moving iron core 32 and the first stationary iron core 33 more compact while ensuring magnetic conductivity, thus reducing the overall size of the relay 100 and facilitating weight reduction.

[0320] It should be noted that the end of the push rod 22 connected to the connecting part 323 extends into the recess 331. Since the connecting part 323 is connected to the push rod 22, and the push rod 22 can move axially under the drive of the moving iron core 32, the recess 331 can provide clearance for the movement of the push rod 22, thereby preventing the push rod 22 from hitting the first stationary iron core 33, so as to improve the reliability of the movement of the push mechanism 20 under the drive of the moving iron core 32.

[0321] It should be noted that the recess 331 is not limited to accommodating the connecting part 323 and providing clearance for the movement of the push rod 22.

[0322] For example, as shown in FIG25, the first convex ring portion 321 extends into the recessed portion 331, and magnetic lines of force can be conducted between the peripheral sidewall of the recessed portion 331 and the outer sidewall of the first convex ring portion 321. In this embodiment, since magnetic lines of force can be conducted between the peripheral sidewall of the recessed portion 331 and the outer sidewall of the first convex ring portion 321, magnetic lines of force can be stably conducted between the first stationary iron core 33 and the moving iron core 32 during the movement of the moving iron core 32 relative to the first stationary iron core 33. As another example, in some embodiments, as shown in FIG26, the moving iron core 32 includes a second convex ring portion 322, a portion of which is housed in the recessed portion 331. Since the recessed portion 331 is located in the main body portion 33a, and the main body portion 33a is located in the space enclosed by the first convex ring portion 321. Therefore, the second convex ring portion 322 located in the recessed portion 331 is also located in the space enclosed by the first convex ring portion 321. In this way, the first convex ring portion 321 and the second convex ring portion 322 are complementaryly embedded with the main body portion 33a, which further enhances the guiding effect of the first stationary iron core 33 on the moving iron core 32, thereby improving the motion stability of the moving iron core 32 in the electromagnetic field generated by the coil 41.

[0323] Given that both the first convex ring portion 321 and the second convex ring portion 322 are portions of the moving iron core 32 that protrude toward the first stationary iron core 33, an annular space is formed between them that surrounds the push rod 22 axially. This annular space accommodates the main body portion 33a, which forms a recessed portion 331. This makes the first stationary iron core 33 and the moving iron core 32 compact, which is beneficial for miniaturization of the relay 100. This achieves miniaturization while ensuring the stability of the moving iron core 32's movement.

[0324] Furthermore, this structure also improves the magnetic conductivity from the first stationary iron core 33 to the moving iron core 32. Specifically, under this structural design, when an electromagnetic field is generated by current flowing through the coil 41, the magnetic lines of force conducted from the first stationary iron core 33 to the moving iron core 32 can include two parts. One part of the magnetic lines of force is conducted from the main body 33a to the first convex ring 321, and the other part of the magnetic lines of force is conducted from the main body 33a to the second convex ring 322, thereby achieving double-sided magnetic conductivity. This allows the magnetic lines of force to be conducted more efficiently from the main body 33a to the moving iron core 32, thereby enhancing the electromagnetic attraction of the moving iron core 32. Therefore, this structural design can enhance the magnetic attraction between the moving iron core 32 and the yoke plate 311 or the second stationary iron core 36 without increasing the number of turns of the coil 41 or increasing the voltage, so as to achieve miniaturization while maintaining the motion stability of the moving iron core 32.

[0325] It should be noted that the structure of the first stationary iron core 33 and the moving iron core 32 is not limited to the above-described situation.

[0326] In some embodiments, a portion of the second convex ring portion 322 is housed within the recessed portion 331, and at least a portion of the connecting portion 323 is located within the recessed portion 331. This allows the recessed portion 331 to accommodate both the first convex ring portion 321 and the connecting portion 323 of the moving iron core 32, achieving a tight fit between the first stationary iron core 33 and the moving iron core 32 while simultaneously increasing the magnetic flux of the moving iron core 32, thus facilitating the miniaturization of the relay 100.

[0327] Referring to Figure 28, in some embodiments, the first stationary iron core 33 further includes a limiting portion 33c. The limiting portion 33c is arranged around the periphery of the main body portion 33a, thereby forming a recess 331 on the periphery of the main body portion 33a. Understandably, the end face of the limiting portion 33c facing the main body portion 33a and the outer wall of the main body portion 33a together form the recess 331.

[0328] It should be noted that the limiting part 33c is located inside the metal shell 34. The limiting part 33c may be in contact with the inner wall of the metal shell 34, or there may be a gap between it and the inner wall of the metal shell 34; this is not limited here.

[0329] 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.

[0330] 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: The yoke assembly includes a first wall and a second wall disposed opposite to each other, the first wall having a first hole for a push rod to pass through; A coil assembly is disposed between the first wall and the second wall, and the coil assembly has mounting holes; A metal housing, located within the mounting hole, has openings at both ends and is arranged axially around the push rod. A movable iron core is located inside the metal shell, and the movable iron core is used to drive the push rod to move axially relative to the yoke assembly; The first stationary iron core, at least part of its structure is located inside the metal shell. In the axial direction perpendicular to the push rod, a portion of the structure of the first stationary iron core coincides with a portion of the structure of the moving iron core, such that magnetic lines of force can be conducted between the sidewalls of the first stationary iron core and the sidewalls of the moving iron core, and at least a portion of the magnetic lines of force pass through the openings at both ends of the metal shell.

2. The magnetic circuit portion of the relay according to claim 1, characterized in that, When the coil assembly is energized, at least some of the magnetic lines of force enter the metal shell from the opening at one end of the metal shell, and exit from the opening at the other end of the metal shell under the conduction of the first stationary iron core and the moving iron core.

3. The magnetic circuit portion of the relay according to claim 1 or 2, characterized in that, The first stationary iron core is disposed between the first wall and the moving iron core, and the push rod is axially movable through the first hole and the first stationary iron core.

4. The magnetic circuit portion of the relay according to claim 3, characterized in that, The magnetic circuit portion includes a second stationary iron core, which is disposed between the second wall and the moving iron core. One end of the metal shell is sealed to the first wall, and the other end is sealed to the second stationary iron core.

5. The magnetic circuit portion of the relay according to claim 1 or 2, characterized in that, The first stationary iron core is disposed between the second wall and the moving iron core.

6. The magnetic circuit portion of the relay according to claim 5, characterized in that, The magnetic circuit section includes a second stationary iron core, which is disposed between the first wall and the moving iron core. The push rod is axially movable and passes through the first hole and the second stationary iron core.

7. The magnetic circuit portion of the relay according to claim 5, characterized in that, One end of the metal shell is sealed to the first wall, and the other end is sealed to the first stationary iron core.

8. The magnetic circuit portion of the relay according to claim 7, characterized in that, The metal shell includes a connected tube and an inner folded edge. The inner folded edge protrudes from the inner wall of the tube. One end of the tube is sealed to the first wall, and the other end is sealed to the first stationary iron core through the inner folded edge. Alternatively, the metal shell includes a connected tube and an outer flange, the outer flange protruding from the outer wall of the tube, one end of the tube being sealed to the first wall through the outer flange, and the other end being sealed to the first stationary iron core; Alternatively, the metal shell includes a tube and an inner folded edge and an outer folded edge connected to both ends of the tube. The inner folded edge protrudes from the inner wall of the tube, and the outer folded edge protrudes from the outer wall of the tube. One end of the tube is sealed to the first stationary iron core through the inner folded edge, and the other end of the tube is sealed to the first wall through the outer folded edge.

9. The magnetic circuit portion of the relay according to claim 1, characterized in that, When the coil assembly is not energized, the opposite end faces of the first stationary iron core and the moving iron core are spaced upward along the axial direction of the push rod. And / or, there is a magnetic gap between the portions of the first stationary iron core and the moving iron core that overlap in the axial direction perpendicular to the push rod, the magnetic gap being less than or equal to 0.5 mm.

10. The magnetic circuit portion of the relay according to claim 1, characterized in that, The first stationary iron core has at least one recess at one end facing the moving iron core, and a portion of the structure of the moving iron core is housed within one of the recesses.

11. The magnetic circuit portion of the relay according to claim 10, characterized in that, The sidewall of the recess is located inside the metal shell.

12. The magnetic circuit portion of the relay according to claim 11, characterized in that, The moving iron core includes at least one convex ring portion, which is axially arranged around the push rod, and at least a portion of the structure of one of the convex ring portions is received in one of the recesses.

13. The magnetic circuit portion of the relay according to claim 12, characterized in that, The first stationary iron core includes a main body portion and a limiting portion connected to each other. The limiting portion is arranged around the periphery of the main body portion to form a first recessed portion on the periphery of the main body portion. The limiting portion is located inside the metal shell. The moving iron core includes a first convex ring portion. A portion of the structure of the first convex ring portion is received in the first recessed portion. The first convex ring portion is in clearance fit with the inner wall of the metal shell.

14. The magnetic circuit portion of the relay according to claim 13, characterized in that, The first stationary iron core includes a first protrusion, which protrudes from the end face of the main body facing away from the moving iron core; wherein, the first protrusion and the first wall can conduct magnetic lines of force, or the first protrusion and the second wall can conduct magnetic lines of force.

15. The magnetic circuit portion of the relay according to claim 13, characterized in that, The main body is provided with a second recess, and part of the structure of the moving iron core is housed in the second recess.

16. The magnetic circuit portion of the relay according to claim 15, characterized in that, The moving iron core includes a second convex ring portion, and a portion of the structure of the second convex ring portion is accommodated in the second recessed portion; And / or, the moving iron core includes a connecting portion for connecting the push rod, at least a portion of the connecting portion being located in the second recess.

17. The magnetic circuit portion of the relay according to claim 13, characterized in that, There is a first assembly gap between the first convex ring portion and the inner wall of the metal shell, and there is a first magnetically conductive gap between the inner side wall of the first convex ring portion and the main body portion. The first assembly gap is smaller than the first magnetically conductive gap.

18. The magnetic circuit portion of the relay according to claim 11, characterized in that, The first stationary iron core includes a main body and a first protrusion connected to each other. The main body has a recess on the side facing the moving iron core, and the first protrusion protrudes from the end face of the main body facing away from the moving iron core. Magnetic lines of force can be conducted between the first protrusion and the first wall, or magnetic lines of force can be conducted between the first protrusion and the second wall.

19. The magnetic circuit portion of the relay according to claim 18, characterized in that, The moving iron core includes a first convex ring portion, and a portion of the structure of the first convex ring portion is housed in the recessed portion; The main body is located inside the metal shell, the outer wall of the maximum diameter of the moving iron core is in clearance fit with the inner wall of the metal shell, and there is a second magnetic gap between the outer wall of the first convex ring and the side wall of the recessed portion.

20. The magnetic circuit portion of the relay according to claim 19, characterized in that, There is a second assembly gap between the outer wall at the maximum diameter of the moving iron core and the inner wall of the metal shell, and the second assembly gap is smaller than the second magnetic gap.

21. The magnetic circuit portion of the relay according to any one of claims 14 or 18-20, characterized in that, The first protrusion passes through the first hole, and magnetic lines of force can be conducted between the first protrusion and the wall of the first hole; or, the second wall has a second hole, the first protrusion passes through the second hole, and magnetic lines of force can be conducted between the first protrusion and the wall of the second hole.

22. The magnetic circuit portion of the relay according to any one of claims 10-13, characterized in that, The first stationary iron core is disposed between the second wall and the moving iron core. The magnetic circuit part also includes a magnetizing element, which is sheet-shaped and sandwiched between the first stationary iron core and the second wall. The magnetizing element can conduct magnetic lines of force between the second wall and the first stationary iron core.

23. The magnetic circuit portion of the relay according to any one of claims 14 or 18-20, characterized in that, The magnetic circuit portion also includes a magnetizing component, which has a through hole. The magnetizing component is sleeved on the first protrusion, and the inner wall of the through hole is in contact with the peripheral side wall of the first protrusion. The magnetizing component can conduct magnetic lines of force between the second wall and the first protrusion.

24. The magnetic circuit portion of the relay according to claim 23, characterized in that, The magnetizing component includes a collar, which is sleeved on the first protrusion and abuts against the inner surface of the second wall; Alternatively, the magnetizing component includes a collar and a protruding edge. The collar is sleeved on the first protrusion, and the protruding edge is arranged around the periphery of the collar and abuts against the inner surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is greater than the wall thickness of the collar. Alternatively, the magnetizing component includes a collar and a protruding edge. The collar is sleeved on the first protrusion, and the protruding edge is arranged around the periphery of the collar and abuts against the outer surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is less than the wall thickness of the collar.

25. The magnetic circuit portion of the relay according to any one of claims 14 or 18-20, characterized in that, A sleeve protrudes from the first wall on the side where the second wall is located, and a sleeve protrudes from the second wall on the side where the first wall is located. The inner wall of the sleeve is connected to the surface of the second wall on the side opposite to the first wall, and the first protrusion extends into the sleeve.

26. The magnetic circuit portion of the relay according to claim 4, characterized in that, The magnetic circuit section also includes a magnetizing element, which is sheet-shaped and sandwiched between the second stationary iron core and the second wall. The magnetizing element can conduct magnetic lines of force between the second wall and the second stationary iron core.

27. The magnetic circuit portion of the relay according to claim 4, characterized in that, The second stationary iron core has a second protrusion on the side facing the second wall. The magnetic circuit part also includes a magnetizing component. The magnetizing component has a through hole. The magnetizing component is sleeved on the second protrusion. The inner wall of the through hole is in contact with the peripheral side wall of the second protrusion. The magnetizing component can conduct magnetic lines of force between the second wall and the second protrusion.

28. The magnetic circuit portion of the relay according to claim 27, characterized in that, The magnetizing component includes a collar, which is sleeved on the second protrusion and abuts against the inner surface of the second wall; Alternatively, the magnetizing component includes a collar and a protruding edge. The collar is sleeved on the second protrusion, and the protruding edge is arranged around the periphery of the collar and abuts against the inner surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is greater than the wall thickness of the collar. Alternatively, the magnetizing component includes a collar and a protruding edge. The collar is sleeved on the second protrusion, and the protruding edge is arranged around the periphery of the collar and abuts against the outer surface of the second wall. The thickness of the protruding edge in the direction of the center line of the collar is less than the wall thickness of the collar.

29. The magnetic circuit portion of the relay according to claim 1, characterized in that, The magnetic circuit section also includes a second stationary iron core, which is located on the side of the moving iron core opposite to the first stationary iron core. A reset spring is provided on the side of the moving iron core opposite to the first stationary iron core. The reset spring is used to push the moving iron core toward the first stationary iron core to reset when the coil assembly is de-energized. And / or, the magnetic circuit portion of the relay further includes a magnetic guide cylinder, which is sleeved outside the metal shell, and at least a portion of the structure of the moving iron core and at least a portion of the structure of the first stationary iron core are located inside the magnetic guide cylinder. The magnetic guide cylinder is used to converge the magnetic lines of force generated by the energization of the coil assembly to the periphery of the first stationary iron core.

30. The magnetic circuit portion of the relay according to claim 1, characterized in that, The yoke assembly includes a yoke plate and a U-shaped yoke, the yoke plate being connected to both ends of the U-shaped yoke, and the first hole being provided in the yoke plate or the U-shaped yoke; Alternatively, the yoke assembly includes a first yoke plate, a second yoke plate, and two side yoke plates, with the two side yoke plates spaced apart from each other and connected between the first yoke plate and the second yoke plate, and the first hole is located on the first yoke plate or the second yoke plate. Alternatively, the yoke assembly may include an integrally formed closed yoke ring.

31. The magnetic circuit portion of the relay according to claim 1, characterized in that, A magnetically conductive gap exists between a portion of the sidewall of the first stationary iron core and a portion of the sidewall of the moving iron core. At least one of the first stationary iron core and the moving iron core is provided with a magnetically shielding layer, and at least a portion of the structure of the magnetically shielding layer is located within the magnetically conductive gap.

32. A relay, characterized in that, Includes the magnetic circuit portion of the relay as described in any one of claims 1 to 31.

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