Relay

Abstract

The present application relates to a relay (100), a magnetic circuit portion (30) of the relay (100) comprising a yoke assembly (31), a coil assembly (32), a metal housing (33), a first static iron core (34), and a movable iron core (35). The yoke assembly (31) comprises a first wall (31a) and a second wall (31b) that are oppositely disposed, the first wall (31a) being provided with a first hole (31c), a first end of the metal housing (33) forming a first opening and a second end thereof forming a second opening, and the first hole (31c) being opposite to the first opening in the axial direction of a push rod (22). At least part of magnetic field lines formed between the first static iron core (34) and the second wall (31b) pass through the second opening, the surface of the first static iron core (34) facing the first wall (31a) is provided with a recessed portion (341), and at least part of the movable iron core (35) is located in the recessed portion (341).

Description

relay

[0001] This application claims priority to Chinese patent application No. 202510377851.6, filed on March 27, 2025, entitled “Relay”, the entire contents of which are incorporated herein by reference. Technical Field

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

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

[0004] In related technologies, relays typically use a metal casing to provide movement space for the moving iron core, thereby improving the movement stability of the moving iron core.

[0005] However, in this structural design, the thickness of the metal casing creates a magnetic gap between the inner and outer magnetic structures, leading to increased magnetic reluctance. Therefore, to ensure proper operation, relays in this technology require either increasing the number of coil turns or raising the applied voltage to provide sufficient power to the moving iron core. Increasing the number of coil turns increases the relay's size, while raising the applied voltage increases its power consumption. Consequently, relays in this technology struggle to simultaneously achieve miniaturization and reduce the pull-in voltage. Summary of the Invention

[0006] According to various embodiments of this application, a relay is provided.

[0007] This application provides a relay, which includes a contact portion, a driving mechanism, and a magnetic circuit portion. The contact portion includes a stationary contact and a moving contact. The driving mechanism is used to drive the moving contact to make contact with or break contact with the stationary contact, and the driving mechanism includes a driving rod. The magnetic circuit portion includes a yoke assembly, a coil assembly, a metal shell, a first stationary iron core, and a moving iron core. The yoke assembly includes a first wall and a second wall disposed opposite to each other, and a first hole for the driving rod to pass through. The coil assembly is disposed between the first wall and the second wall, and the coil assembly has a mounting hole.

[0008] The metal shell is fixedly disposed within the mounting hole. The metal shell is arranged around the axial direction of the push rod. The metal shell has a first end and a second end along the axial direction of the push rod. The first end forms a first opening, and the second end forms a second opening. The first hole is opposite to the first opening along the axial direction of the push rod, allowing a portion of the push rod's structure to extend into the metal shell through the first opening. At least a portion of the structure of the first stationary iron core is opposite to the second opening along the axial direction of the push rod and is used to conduct magnetic lines of force with the second wall. At least a portion of the magnetic lines of force conducted between the first stationary iron core and the second wall passes through the second opening. A recess is provided on the side of the first stationary iron core facing the first wall. The moving iron core is used to drive the push rod to move axially relative to the yoke assembly. At least a portion of the structure of the moving iron core is housed in the recess. In the axial direction perpendicular to the push rod, the outer sidewall of the moving iron core is opposite to the inner sidewall of the recess, and magnetic lines of force can be conducted between them.

[0009] In the aforementioned relay, a first opening is formed at the first end of the metal casing, and a second opening is formed at the second end. This structure, with openings at both ends, allows magnetic field lines to be conducted away from the sidewalls of the metal casing. Specifically, at least a portion of the structure of the first stationary iron core is opposite the second opening along the axial direction of the push rod and is used to conduct magnetic field lines with the second wall, such that at least a portion of the magnetic field lines conducted between the first stationary iron core and the second wall pass through the second opening. At least a portion of the structure of the moving iron core is housed in a recess. In the axial direction perpendicular to the push rod, the outer sidewall of the moving iron core is opposite the inner sidewall of the recess, and magnetic field lines can be conducted between them. Therefore, in the relay of this application, magnetic lines of force can enter the metal shell from one of the first opening and the second opening, and exit from the other of the first opening and the second opening under the conduction of the first stationary iron core and the moving iron core. This avoids the increase in magnetic resistance caused by the wall thickness of the metal shell. Moreover, since at least a part of the structure of the moving iron core is housed in the recess, a part of the structure of the first stationary iron core is covered by the outside of the moving iron core. In this way, the arrangement of the first stationary iron core will not interfere with the push rod connected to the moving iron core. Therefore, the first stationary iron core can maximize the magnetic conduction area between itself and the outer side wall of the moving iron core through the side wall of the recess, which is beneficial to the conduction of magnetic lines of force between the first stationary iron core and the moving iron core, thereby enhancing the electromagnetic power of the moving iron core. Therefore, the magnetic circuit of the relay of this application does not need to adopt the approach of increasing the number of coil turns or increasing the pull-in voltage as in related technologies, so as to meet the need for the moving iron core to obtain sufficient power and holding force in the electromagnetic field generated by the coil assembly. This enables the miniaturization of the relay while reducing the pull-in voltage.

[0010] In one embodiment, the first wall is sealed to the first end, closing the first opening; the first stationary iron core is sealed to the second end, closing the second opening. This utilizes a metal casing to improve the sealing performance of the relay.

[0011] In one embodiment, the moving iron core includes a first magnetically conductive portion and a second magnetically conductive portion. The first magnetically conductive portion has a magnetic pole surface facing the first wall, and the second magnetically conductive portion is connected to the side of the first magnetically conductive portion facing away from the magnetic pole surface. At least a portion of the structure of the first magnetically conductive portion is located within the metal shell and outside the recess, while at least a portion of the structure of the second magnetically conductive portion is housed within the recess. The outer wall of the second magnetically conductive portion faces the inner wall of the recess, and magnetic lines of force can be conducted between them. Therefore, the first stationary iron core can maximize the magnetically conductive area between itself and the outer wall of the second magnetically conductive portion of the moving iron core through the inner wall of the recess, thereby facilitating the conduction of magnetic lines of force between the first stationary iron core and the moving iron core, and enhancing the electromagnetic power of the moving iron core.

[0012] In one embodiment, the area of ​​the magnetic pole surface is larger than the area of ​​the orthographic projection region of the second magnetically conductive part on the magnetic pole surface. A large magnetic pole surface helps maintain sufficient magnetic attraction between the moving iron core and the first wall. Reducing the area of ​​the orthographic projection region of the second magnetically conductive part on the magnetic pole surface allows for a smaller volume of the second magnetically conductive part, thus contributing to the weight reduction of the moving iron core and enabling it to output a larger driving force to move the push rod.

[0013] In one embodiment, the second magnetic conductive part is annular and arranged around the axial direction of the push rod. Compared with a solid columnar structure, this second magnetic conductive part is lighter, which in turn helps to reduce the overall weight of the moving iron core, thereby increasing the power of the moving iron core to drive the push rod to move axially.

[0014] In one embodiment, the peripheral surface of the first magnetically conductive part is cylindrical, and the first and second magnetically conductive parts are coaxially arranged along the axial direction of the push rod. This ensures that the center of gravity of the moving iron core is located on the axis of the push rod, making it less likely for the moving iron core to deviate to one side during movement. Therefore, this coaxial structure is beneficial to the stability of the moving iron core's movement along the axial direction of the push rod.

[0015] In one embodiment, there is an assembly gap between the first magnetically conductive part and the inner wall of the metal shell, and a magnetically conductive gap between the outer wall of the second magnetically conductive part and the side wall of the recessed part. The assembly gap is smaller than the magnetically conductive gap, so as to reduce the movement resistance of the moving iron core while accommodating the miniaturization of the relay, thereby facilitating the smooth movement of the moving iron core.

[0016] In one embodiment, the magnetic gap is less than or equal to 0.5 mm. This facilitates the conduction of magnetic lines of force between a portion of the sidewall of the first stationary iron core and a portion of the sidewall of the moving iron core. Furthermore, the presence of the magnetic gap reduces the attraction between the first stationary iron core and the moving iron core in the axial direction perpendicular to the push rod, thereby reducing the friction between them and thus improving the electromagnetic power of the moving iron core when it moves along the axial direction of the push rod.

[0017] In one embodiment, 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 magnetically conductive gap. The magnetic shielding layer maintains a 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 and the first stationary 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, thus helping to reduce the resistance to the moving iron core driving the push rod to move axially.

[0018] In one embodiment, the first wall has a protrusion extending toward the side where the moving iron core is located, and at least a portion of the protrusion extends into the metal shell through the first opening. This protrusion reduces the distance between the first wall and the magnetic pole face, thereby increasing the magnetic attraction between the moving iron core and the first wall.

[0019] In one embodiment, the sidewall of the protrusion contacts the inner wall of the metal shell; thus, the surface of the protrusion facing the magnetic pole face is large, which helps to increase the magnetic attraction between the moving iron core and the first wall.

[0020] In one embodiment, the side of the protrusion facing the moving iron core is transitioned to the sidewall of the protrusion by a rounded corner. Thus, during long-term operation of the relay, even if the moving iron core repeatedly impacts the protrusion due to reciprocating motion along the axial direction of the push rod, the protrusion is less likely to be damaged, thereby extending the service life of the relay.

[0021] In one embodiment, the protrusion is cast into the first wall, which provides good structural stability.

[0022] In one embodiment, the protrusion is formed on the first wall by stamping, which is a simple processing method and results in high overall structural strength of the first wall.

[0023] In one embodiment, the entire structure of the first stationary iron core is located outside the metal casing. Therefore, the metal casing does not occupy the peripheral space of the first stationary iron core, which facilitates the miniaturization of the relay.

[0024] In one embodiment, the second end of the metal shell is connected to the end face of the first stationary iron core that forms the recess. Thus, the first stationary iron core is located outside the space enclosed by the metal shell, and therefore the metal shell does not occupy the peripheral space of the first stationary iron core. Attached Figure Description

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

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

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

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

[0029] Figure 4 is a schematic diagram of the structure of the relay shown in Figure 3 when the moving contact is in contact with the two stationary contacts.

[0030] Figure 5 is a cross-sectional view of the relay in another embodiment.

[0031] Figure 6 is a cross-sectional schematic diagram of the relay in another embodiment.

[0032] Figure 7 is a cross-sectional schematic diagram of a relay according to another embodiment.

[0033] Figure 8 is a cross-sectional view of a relay according to an embodiment of this application when it is equipped with a magnetizing element.

[0034] Figure 9 is a cross-sectional view of a relay according to an embodiment of this application when it is equipped with a magnetic cylinder.

[0035] Figure 10 is a cross-sectional view of a relay with a magnetic cylinder according to another embodiment of this application.

[0036] Figure 11 is a cross-sectional view of a relay according to an embodiment of this application when the magnetic cylinder is omitted.

[0037] Reference numerals: 100, relay; 10, contact part; 11, stationary contact; 12, moving contact; 20, pushing mechanism; 21, pushing base; 22, pushing rod; 30, magnetic circuit part; 31, yoke assembly; 31a, first wall; 31b, second wall; 31c, first hole; 31d, second hole; 31e, protrusion; 311, yoke plate; 312, U-shaped yoke; 32, coil assembly; 321, coil; 322, coil frame; 32a, mounting hole; 33, metal 331. Inner folded edge; 332. Outer folded edge; 34. First stationary iron core; 341. Recessed portion; 34a. Main body portion; 34b. Protruding portion; 35. Moving iron core; 351. First magnetic conductive portion; 351a. Magnetic pole surface; 352. Second magnetic conductive portion; 36. Return spring; 37. Second stationary iron core; 371. Supporting portion; 38. Magnetizing component; 38a. Through hole; 381. Collar; 382. Protruding edge; 39. Magnetic conductive cylinder; 40. Ceramic cover; 50. Frame edge. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] It should be noted that if an element is referred to as being "fixed to" or "attached to" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] As shown in Figures 1 and 2, this application provides a relay 100 that can be applied in automatic control circuits.

[0043] The relay 100 includes a contact portion 10, an actuation mechanism 20, and a magnetic circuit portion 30.

[0044] 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 action of the pushing mechanism 20, achieving electrical conductivity between the moving contact 12 and the stationary contact 11 when they are in contact, and electrical disconnection when they are separated. The stationary contact 11 includes, but is not limited to, fixed terminals or stationary springs; the moving contact 11 includes, but is not limited to, movable terminals or moving contact pieces.

[0045] The pushing mechanism 20 includes a pushing seat 21 and a pushing rod 22 connected to each other. A 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.

[0046] Continuing with Figures 1 and 2, the magnetic circuit section 30 includes a yoke assembly 31, a coil assembly 32, a metal shell 33, a first stationary iron core 34, and a moving iron core 35.

[0047] 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 31c for passing through the push rod 22.

[0048] 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 31c is provided in 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.

[0049] 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.

[0050] 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 31c is provided in either the first yoke plate or the second yoke plate, as long as the first hole 31c can accommodate the insertion of the push rod 22.

[0051] 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.

[0052] 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 35 drives the push rod 22 to move axially relative to the yoke assembly 31.

[0053] A coil assembly 32 is disposed between the first wall 31a and the second wall 31b. The coil assembly 32 has a mounting hole 32a. In some embodiments, the coil assembly 32 includes a coil 321 and a coil frame 322, with the coil 321 wound around the coil frame 322. The mounting hole 32a is located in the middle of the coil frame 322. Both ends of the coil frame 322 abut against the first wall 31a and the second wall 31b, respectively, thereby enclosing an assembly space between the first wall 31a and the second wall 31b. This assembly space is used to install structures such as the moving iron core 35 and the first stationary iron core 34.

[0054] Referring to Figures 2 to 4, the metal shell 33 is arranged around the axial direction of the push rod 22. The metal shell 33 has a first end and a second end along the axial direction of the push rod 22.

[0055] The metal shell 33 is fixedly disposed within the mounting hole 32a. It should be noted that "fixedly disposed" means that the metal shell 33 is fixed in position within the mounting hole 32a after being assembled into it, not that the metal shell 33 and the coil assembly 32 are non-removable. For example, in some embodiments, the first end is connected to the first wall 31a, thereby fixing the metal shell 33 relative to the yoke assembly 31. Thus, when the yoke assembly 31 and the coil assembly 32 are assembled together, the position of the metal shell 33 within the mounting hole 32a is fixed. As another example, in some embodiments, the first stationary iron core 34 is connected to the second end. Thus, when the first stationary iron core 34, the yoke assembly 31, and the coil assembly 32 are assembled together, the position of the metal shell 33 within the mounting hole 32a can also be fixed. The connection relationship or assembly method between the metal shell 33 and other structural components is not limited here, as long as the position of the metal shell 33 within the mounting hole 32a is fixed in the relay 100 and does not become loose during the use of the relay 100.

[0056] The first end forms the first opening, and the second end forms the second opening.

[0057] In the relay 100 of the above embodiment, a first opening is formed at the first end of the metal housing 33, and a second opening is formed at the second end. Thus, the metal housing 33 has a structure with openings at both ends, allowing magnetic field lines to be conducted at a position avoiding the sidewalls of the metal housing 33.

[0058] For ease of understanding, the structure of the relay 100 in the embodiments of this application will be further explained below with reference to the relay 100 shown in Figures 2 to 4.

[0059] In some embodiments, the first hole 31c is opposite to the first opening along the axial direction of the push rod 22, so that part of the structure of the push rod 22 can extend into the metal shell 33 through the first opening to meet the need for the push rod 22 to be connected to the moving iron core 35.

[0060] The moving iron core 35 can be partially or entirely located within the metal shell 33, as long as the moving iron core 35 can move axially relative to the yoke assembly 31 under the drive of the push rod 22.

[0061] The first stationary iron core 34 has a recess 341 on the side facing the first wall 31a. At least a portion of the structure of the moving iron core 35 is housed in the recess 341. In the axial direction perpendicular to the push rod 22, the outer side wall of the moving iron core 35 is opposite to the inner side wall of the recess 341 and magnetic lines of force can be conducted between them.

[0062] At least a portion of the structure of the first stationary iron core 34 is opposite to the second opening along the axial direction of the push rod 22 and is used to conduct magnetic lines of force with the second wall 31b, such that at least a portion of the magnetic lines of force conducted between the first stationary iron core 34 and the second wall 31b passes through the second opening.

[0063] With the above structural arrangement, in the relay 100 of this application, magnetic lines of force can enter the metal shell 33 from one of the first opening and the second opening, and exit from the other of the first opening and the second opening under the conduction of the first stationary iron core 34 and the moving iron core 35. This avoids the increase in magnetic resistance caused by the wall thickness of the metal shell 33. Moreover, since at least a portion of the structure of the moving iron core 35 is housed in the recess 341, a portion of the structure of the first stationary iron core 34 is disposed outside the moving iron core 35. Thus, the arrangement of the first stationary iron core 34 will not interfere with the push rod 22 connected to the moving iron core 35. Therefore, the first... The stationary iron core 34 can maximize the magnetic conduction area between itself and the outer wall of the moving iron core 35 through the inner wall of the recessed portion 341, thereby facilitating the conduction of magnetic lines of force between the first stationary iron core 34 and the moving iron core 35, and enhancing the electromagnetic power of the moving iron core 35. 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 321 or increase the pull-in voltage as in related technologies, in order to meet the need for the moving iron core 35 to obtain sufficient power and holding force in the electromagnetic field generated by the coil assembly 32, thereby achieving both miniaturization of the relay 100 and reduction of the pull-in voltage.

[0064] In some embodiments, the first end is sealed to the first wall 31a, thereby closing the first opening. The first stationary iron core 34 is sealed to the second end. The first stationary iron core 34 closes the second opening, so that the metal shell 33 can be used to improve the sealing performance of the relay 100. For ease of understanding, the sealing requirements of the relay 100 during operation will be explained below. During the operation of the relay 100, when the moving contact 12 separates from the stationary contact 11, an electric arc is easily generated. The high temperature and energy generated by the arc may damage the contact portion 10 and other components inside the relay 100, affecting the reliability and lifespan of the relay 100. In addition, the relay 100 also has requirements for airtightness. A reduction in airtightness may allow external moisture, dust, or other impurities to enter the relay 100, affecting the normal operation of the relay 100 and increasing the risk of corrosion and damage to the internal components of the relay 100. Therefore, the contact portion 10 is usually placed in the contact cavity, and the contact cavity is filled with inert gas to assist in arc extinguishing and to provide a good sealing environment for the contact portion 10.

[0065] As shown in Figures 2 and 3, in some embodiments, the relay 100 further includes a ceramic cover 40 and a frame edge 50. The ceramic cover 40 is disposed on the side of the yoke plate 311 facing away from the moving iron core 35. The ceramic cover 40 is sealed to the yoke plate 311 through the frame edge 50; that is, the ceramic cover 40 is sealed to one end of the frame edge 50, and the other end of the frame edge 50 (i.e., the end farther from the ceramic cover 40) is sealed to the yoke plate 311. Thus, the ceramic cover 40, the frame edge 50, and the yoke plate 311 enclose a contact cavity, providing a sealed environment for the contact portion 10.

[0066] The frame edge 50 is made of metal. The ceramic cover 40 and the frame edge 50 can be brazed together to facilitate a stable connection between the ceramic cover 40 and the frame edge 50 and maintain the airtightness between them.

[0067] Two stationary contacts 11 are both installed on the top wall of the ceramic cover 40, and are spaced apart from each other. A moving contact 12 is connected to a push base 21, and both are located inside the ceramic cover 40. The moving contact 12 and the push base 21 can be directly connected or indirectly connected through other intermediate structural components. For example, in some embodiments, the moving contact 12 and the push base 21 are connected by a bracket. The specific connection method between the moving contact 12 and the push base 21 is not limited here, as long as the moving iron core 35 pushes the push base 21 via the push rod 22, and the push base 21 can drive the moving contact 12 to move relative to the stationary contact 11 to achieve a contact or disconnection action.

[0068] Since the push rod 22 passes through the first hole 31c and is connected between the push seat 21 and the moving iron core 35, the push rod 22 can transmit the power of the moving iron core 35 moving in the mounting hole 32a of the coil frame 322 to the push seat 21, so that the push seat 21, with the moving contact 12, comes into contact with or separates from the two stationary contact 11.

[0069] Because the first end of the metal shell 33 is sealed to the yoke plate 311, and the second end of the metal shell 33 is sealed to the first stationary iron core 34, the first stationary iron core 34 and the metal shell 33 enclose the mounting space on the side of the yoke plate 311 away from the contact cavity. The mounting space communicates with the contact cavity through the first hole 31c, and the mounting space and the contact cavity as a whole maintain a good seal. Therefore, external moisture, dust, or other impurities cannot enter the mounting space and the contact cavity. Moreover, after the contact cavity is filled with inert gas, the inert gas is not easy to leak, so as to maintain a good arc extinguishing effect.

[0070] Magnetic lines of force can be conducted between the first stationary iron core 34 and the second wall 31b, and magnetic lines of force can be conducted between the first stationary iron core 34 and the first wall 31a. The moving iron core 35, the first stationary iron core 34, and the yoke assembly 31 form a complete magnetic circuit. Thus, when the coil 321 is energized, the moving iron core 35 drives the pusher seat 21 to move toward 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 12 and the stationary contact 11.

[0071] In some embodiments, the moving iron core 35 includes a first magnetically conductive portion 351 and a second magnetically conductive portion 352. The first magnetically conductive portion 351 has a magnetic pole surface 351a facing the first wall 31a, and the second magnetically conductive portion 352 is connected to the side of the first magnetically conductive portion 351 facing away from the magnetic pole surface 351a. At least a portion of the structure of the first magnetically conductive portion 351 is located within the metal shell 33 and outside the recess 341, while at least a portion of the structure of the second magnetically conductive portion 352 is housed within the recess 341. The outer sidewall of the second magnetically conductive portion 352 is opposite to the inner sidewall of the recess 341, and magnetic lines of force can be conducted between them.

[0072] Since at least a portion of the structure of the second magnetically conductive part 352 of the moving iron core 35 is housed in the recess 341, a portion of the structure of the first stationary iron core 34 is disposed outside the moving iron core 35. In this way, the arrangement of the first stationary iron core 34 will not interfere with the push rod 22 connected to the moving iron core 35. Therefore, the first stationary iron core 34 can maximize the magnetic field area between itself and the outer wall of the second magnetically conductive part 352 of the moving iron core 35 through the inner wall of the recess 341. This facilitates the conduction of magnetic lines of force between the first stationary iron core 34 and the moving iron core 35, thereby enhancing the electromagnetic power of the moving iron core 35. Therefore, the magnetic circuit part 30 of the relay 100 of this application does not need to increase the number of turns of the coil 321 or increase the pull-in voltage as in related technologies to meet the need for the moving iron core 35 to obtain sufficient power and holding force in the electromagnetic field generated by the coil assembly 32. This allows for the miniaturization of the relay 100 while reducing the pull-in voltage.

[0073] In some embodiments, the area of ​​the magnetic pole surface 351a is larger than the area of ​​the second magnetically conductive part 352 projected onto the magnetic pole surface 351a. With this structural arrangement, the area of ​​the magnetic pole surface 351a facing the first wall 31a of the moving iron core 35 is large, while the area of ​​the second magnetically conductive part 352 projected onto the magnetic pole surface 351a is small. The large area of ​​the magnetic pole surface 351a helps maintain sufficient magnetic attraction between the moving iron core 35 and the first wall 31a. Reducing the area of ​​the second magnetically conductive part 352 projected onto the magnetic pole surface 351a allows for a smaller volume of the second magnetically conductive part 352, thus contributing to the weight reduction of the moving iron core 35 and enabling the moving iron core 35 to output a larger pushing force to drive the push rod.

[0074] 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.

[0075] As shown in Figure 4, the first hole 31c 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 35. The end of the push rod 22 away from the moving contact member 12 passes through the yoke plate 311 and is connected to the moving iron core 35. In this embodiment, the push rod 22 passes through the first hole 31c in the yoke plate 311, and the pusher seat 21 and the moving iron core 35, which are connected to both ends of the push rod 22, are located on both sides of the yoke plate 311.

[0076] A return spring 36 is provided between the yoke plate 311 and the moving iron core 35.

[0077] When coil 321 is energized, the moving iron core 35 is magnetized and attracts the yoke plate 311. Therefore, the moving iron core 35 overcomes the elastic force of the return spring 36 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 12 on push seat 21 to contact the two stationary contacts 11. In this way, the moving contact 12 can be used to conduct the electrical connection between the two stationary contacts 11.

[0078] When the coil 321 is de-energized, the moving iron core 35 moves away from the yoke plate 311 under the elastic force of the return spring 36. In this way, the moving iron core 35 moves the push seat 21 away from the stationary contact 11 via the push rod 22, so that the moving contact 12 is separated from the two stationary contacts 11, thereby breaking the electrical contact.

[0079] The second magnetic conductive part 352 is annular and arranged around the axial direction of the push rod 22. In this embodiment, since the second magnetic conductive part 352 is annular, it is lighter than a solid columnar structure, which is beneficial to the overall weight reduction of the moving iron core 35, thereby improving the power of the moving iron core 35 to drive the push rod 22 to move axially.

[0080] The peripheral surface of the first magnetically conductive part 351 is cylindrical. The first magnetically conductive part 351 and the second magnetically conductive part 352 are coaxially arranged along the axial direction of the push rod 22, so that the center of gravity of the moving iron core 35 is located on the axis of the push rod 22. In this way, the moving iron core 35 is less likely to deviate to one side when it moves. Therefore, this coaxial arrangement structure is beneficial to the stability of the moving iron core 35 moving along the axial direction of the push rod 22.

[0081] There is an assembly gap between the first magnetic conductive part 351 and the inner wall of the metal shell 33, and there is a magnetic conductive gap between the outer wall of the second magnetic conductive part 352 and the side wall of the recessed part 341. The assembly gap is smaller than the magnetic conductive gap.

[0082] Since the metal shell 33 is non-magnetic, no magnetic lines of force are conducted between the first magnetically conductive part 351 and the metal shell 33, and the two will not attract each other. Therefore, there is no need to worry about lateral attraction (i.e., magnetic attraction perpendicular to the axial direction of the push rod 22) between them, and the assembly gap between the first magnetically conductive part 351 and the inner wall of the metal shell 33 can be minimized as much as possible. The smaller the assembly gap between the first magnetically conductive part 351 and the inner wall of the metal shell 33, the more compact the assembly between the two, which is beneficial for the miniaturization of the relay 100. The second magnetically conductive part 352 and the sidewall of the recessed part 341 need to conduct magnetism, and the moving iron core 35 can move relative to the first stationary iron core 34 after magnetization. To avoid a large magnetic attraction between the moving iron core 35 and the first stationary iron core 34 in the axial direction perpendicular to the push rod 22, which would increase the resistance of the moving iron core 35 moving in the axial direction of the push rod 22, the magnetically conductive gap between the outer sidewall of the second magnetically conductive part 352 and the sidewall of the recessed part 341 should not be too small. Therefore, in this embodiment, the assembly gap is smaller than the magnetically conductive gap, which can reduce the movement resistance of the moving iron core 35 while achieving the miniaturization of the relay 100, so as to facilitate the smooth movement of the moving iron core 35.

[0083] In some embodiments, the assembly gap ranges from 0.1 mm to 0.5 mm, that is, the assembly gap is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. Since the assembly gap is greater than or equal to 0.1 mm, during the movement of the moving iron core 35, this assembly gap can provide movement space for the first magnetic conductive part 351 in the axial direction perpendicular to the push rod 22, thereby reducing the probability of direct contact between the first magnetic conductive part 351 and the inner wall of the metal shell 33 and the contact friction force when they come into contact, making the movement of the moving iron core 35 along the axial direction of the push rod 22 smoother.

[0084] In some embodiments, the magnetic gap is less than or equal to 0.5 mm, which facilitates the conduction of magnetic lines of force between a portion of the sidewall of the first stationary iron core 34 and a portion of the sidewall of the moving iron core 35. The presence of the magnetic gap reduces the attraction between the first stationary iron core 34 and the moving iron core 35 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 35 when it moves along the axial direction of the push rod 22.

[0085] 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.

[0086] In some embodiments, at least one of the first stationary iron core 34 and the moving iron core 35 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 35 and the first stationary iron core 34 in the axial direction perpendicular to the push rod 22, preventing the inner walls of the moving iron core 35 and the first stationary iron core 34 from contacting each other. This reduces the attraction between the first stationary iron core 34 and the moving iron core 35 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 34 and the moving iron core 35, thereby reducing frictional resistance and thus reducing the resistance to the moving iron core 35 driving the push rod 22 axially, which in turn improves the electromagnetic power of the moving iron core 35.

[0087] 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 35.

[0088] 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.

[0089] In some embodiments, only one of the first stationary iron core 34 and the moving iron core 35 is provided with a magnetic shielding layer. In some embodiments, each of the first stationary iron core 34 and the moving iron core 35 is provided with a magnetic shielding layer.

[0090] In embodiments where only one of the first stationary iron core 34 and the moving iron core 35 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 34 and the sidewall of the moving iron core 35.

[0091] In embodiments where the first stationary iron core 34 and the moving iron core 35 are each provided with a magnetic shielding layer, the total thickness of the magnetic shielding layer on the first stationary iron core 34 and the moving iron core 35 does not exceed the magnetically conductive gap between the sidewall of the first stationary iron core 34 and the sidewall of the moving iron core 35.

[0092] 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 32, so that the first stationary iron core 34, the moving iron core 35 and the yoke assembly 31 form a complete magnetic circuit.

[0093] 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 34 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 35 and the yoke assembly 31 by providing other magnetically conductive structures. Regardless of whether the magnetic circuit portion 30 includes other magnetically conductive structures, it is sufficient that the first stationary iron core 34, the moving iron core 35, and the yoke assembly 31 constitute a complete magnetic circuit.

[0094] Referring again to Figure 3, in some embodiments, the magnetic circuit portion 30 of the relay 100 further includes a second stationary iron core 37. The second stationary iron core 37 is disposed between the first wall 31a and the moving iron core 35, and the push rod 22 is axially movable through the first hole 31c and the second stationary iron core 37. In this embodiment, the second stationary iron core 37 can conduct magnetic lines of force between the first wall 31a and the moving iron core 35, enabling the conduction of magnetic lines of force between them. Thus, the first stationary iron core 34, the moving iron core 35, the second stationary iron core 37, and the yoke assembly 31 constitute a complete magnetic circuit. The moving iron core 35, by attracting the second stationary iron core 37, 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.

[0095] As shown in Figure 4, when the voltage applied to coil 321 reaches the pull-in voltage, the magnetic attraction between the moving iron core 35 and the second stationary iron core 37 will cause the moving iron core 35 to approach the second stationary iron core 37 and eventually be attracted to it. Thus, the moving iron core 35, via the push rod 22, drives the push base 21 to move towards the stationary contact 11, ultimately causing the moving contact 12 on the push base 21 to contact the two stationary contacts 11, thereby establishing an electrical connection between the two stationary contacts 11.

[0096] It should be noted that in an embodiment where the magnetic circuit portion 30 of the relay 100 also includes a second stationary iron core 37, the reset spring 36 may be disposed between the second stationary iron core 37 and the moving iron core 35, and the reset spring 36 is used to push the moving iron core 35 away from the second stationary iron core 37.

[0097] In some embodiments, the second stationary iron core 37 is provided with a supporting portion 371, which is used to elastically engage with the moving iron core 35 via the return spring 36. A push rod 22 passes through the return spring 36 and the supporting portion 371. Thus, when the coil 321 is energized, the moving iron core 35 is magnetized and attracts the second stationary iron core 37, 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 12 on the push seat 21 into contact with the stationary contact 11. When the energization of the coil 321 is disconnected, the moving iron core 35 loses its magnetism or its magnetic force weakens, and the elastic force of the return spring 36 drives the moving iron core 35 to reset, i.e., pushes the moving iron core 35 toward the first stationary iron core 34, thereby causing the push rod 22 to move the push seat 21 closer to the first wall 31a. Thus, the moving contact 12 on the push seat 21 moves away from the stationary contact 11.

[0098] Referring to Figure 5, in some embodiments, the second stationary iron core 37 may be omitted. In this case, the integrity of the magnetic circuit can be satisfied by using the magnetic lines of force conducted between the first wall 31a and the moving iron core 35. In this embodiment, the return spring 36 may have one end in contact with the first wall 31a and the other end in contact with the moving iron core 35, so that the moving iron core 35 drives the push rod 22 to return to its original position closer to the second wall 31b.

[0099] Understandably, since the first magnetic conductive part 351 has a magnetic pole surface 351a facing the first wall 31a, the smaller the distance between the magnetic pole surface 351a and the first wall 31a, the greater the magnetic attraction between them.

[0100] Based on this, and in conjunction with Figures 6 and 7, in some embodiments, the first wall 31a has a protrusion 31e extending toward the side where the moving iron core 35 is located. At least a portion of the structure of the protrusion 31e extends into the metal shell 33 through the first opening, thereby reducing the distance between the first wall 31a and the magnetic pole surface 351a by utilizing the protrusion 31e, which helps to improve the magnetic attraction between the moving iron core 35 and the first wall 31a.

[0101] Referring to Figure 6, in some embodiments, the sidewall of the protrusion 31e is in contact with the inner wall of the metal shell 33. This results in a large surface area of ​​the protrusion 31e opposite the magnetic pole face 351a, which helps to increase the magnetic attraction between the moving iron core 35 and the first wall 31a.

[0102] Referring to Figure 7, in some embodiments, the side of the protrusion 31e facing the moving iron core 35 transitions to the sidewall of the protrusion 31e with a rounded corner. That is, the edge of the protrusion 31e is rounded, which improves the structural strength of the protrusion 31e. Thus, during long-term operation of the relay 100, even if the moving iron core 35 reciprocates along the axial direction of the push rod 22 and repeatedly impacts the protrusion 31e, the protrusion 31e is less likely to be damaged, thereby extending the service life of the relay 100.

[0103] The protrusion 31e can be formed into the first wall 31a by casting, which provides good structural stability. In some embodiments, the protrusion 31e is also formed into the first wall 31a by stamping, which is a simple processing method and provides high overall structural strength to the first wall 31a.

[0104] Referring to Figure 3, in some embodiments, the metal shell 33 forms an outer flange 332 at the first opening, and the outer flange 332 is sealed to the first wall 31a. In this embodiment, the outer flange 332 facilitates the connection between the first end of the metal shell 33 and the first wall 31a by welding, thereby improving the connection stability and sealing between the metal shell 33 and the first wall 31a.

[0105] The metal shell 33 forms an inner folded edge 331 at the second opening, and the inner folded edge 331 is sealed to the first stationary iron core 34. The inner folded edge 331 facilitates the connection between the metal shell 33 and the first stationary iron core 34 by welding, thereby improving the connection stability and sealing between the metal shell 33 and the first stationary iron core 34.

[0106] In some embodiments, when the coil assembly 32 is not energized, the opposing end faces of the first stationary iron core 34 and the moving iron core 35 are spaced apart along the axial direction of the push rod 22. Thus, when the coil assembly 32 is energized, the gap between the opposing end faces of the first stationary iron core 34 and the moving iron core 35 reduces the attraction force between them in the axial direction of the push rod 22, making it easier for the moving iron core 35 to move away from the first stationary iron core 34, thereby reducing the pull-in voltage.

[0107] It should be noted that the relay 100 can also be considered to be in its initial state when the coil assembly 32 is not energized. Since the end faces of the first stationary iron core 34 and the moving iron core 35 are spaced apart along the axial direction of the push rod 22 at this time, when the moving iron core 35 moves toward the first stationary iron core 34 to disengage the moving contact 12 from the stationary contact 11, the relay 100 returns to its initial state. The end faces of the moving iron core 35 and the first stationary iron core 34 are always spaced apart along the axial direction of the push rod 22, thereby avoiding noise caused by collision between the moving iron core 35 and the first stationary iron core 34, thus reducing the operating noise of the relay 100.

[0108] Furthermore, in the embodiment where the first stationary iron core 34 is connected to the metal shell 33, since the opposing end faces of the first stationary iron core 34 and the moving iron core 35 are spaced apart along the axial direction of the push rod 22, the connection between the first stationary iron core 34 and the metal shell 33 can be prevented from being damaged by repeated collisions with the moving iron core 35. In other words, with this structural arrangement, the reciprocating motion of the moving iron core 35 relative to the first stationary iron core 34 will not impair the reliability of the connection between the first stationary iron core 34 and the metal shell 33, thereby maintaining the stability of the metal shell 33. Therefore, in the embodiment where the first stationary iron core 34 and the metal shell 33 are sealed together, this structural arrangement helps to reduce the probability of cracking at the connection between the first stationary iron core 34 and the metal shell 33, thereby improving the sealing performance of the relay 100.

[0109] In the relay 100 of this application, the metal shell 33 guides the movement of the moving iron core 35, thereby enhancing the movement stability of the moving iron core 35. For example, when the coil assembly 32 is energized, the moving iron core 35, guided by the metal shell 33, can drive the push rod 22 to move axially relative to the yoke assembly 31. Thus, the guidance of the moving iron core 35 by the metal shell 33 improves the movement stability of the moving iron core 35.

[0110] It should be noted that regardless of whether the relay 100 is energized, as long as at least part of the structure of the moving iron core 35 is located inside the metal shell 33 when the moving iron core 35 drives the push rod 22 to move, the inner wall of the metal shell 33 can be used to correct the radial deviation of the moving iron core 35 during its movement, so that the moving iron core 35 drives the push rod 22 to move stably during its movement.

[0111] In some embodiments, when the coil assembly 32 is not energized, a portion of the structure of the moving iron core 35 is located inside the metal shell 32, while another portion is located outside the metal shell 32. Thus, a portion of the moving iron core 35 is always located inside the metal shell 32, allowing it to move smoothly relative to the metal shell 32 without needing to be aligned with it when the coil assembly 32 is energized.

[0112] 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.

[0113] Taking the conduction of magnetic field lines between the first stationary iron core 34 and the second wall 31b of the yoke assembly 31 as an example, the first stationary iron core 34 can achieve magnetic conduction between the two by contacting the second wall 31b. In some embodiments, a magnetically conductive gap may also exist between the first stationary iron core 34 and the second wall 31b. Whether the magnetically conductive gap is filled with air or other magnetically conductive media is provided, it is acceptable as long as the gap between the first stationary iron core 34 and the yoke assembly 31 meets the magnetic conduction requirements.

[0114] Referring again to Figures 3 and 4, in some embodiments, the first stationary iron core 34 includes a main body portion 34a and a protrusion portion 34b connected together. A recessed portion 341 is provided on the side of the main body portion 34a facing the moving iron core 35. The protrusion portion 34b protrudes from the end face of the main body portion 34a facing away from the moving iron core 35. Magnetic lines of force can be conducted between the protrusion portion 34b and the second wall 31b, thereby enabling the first stationary iron core 34 to conduct magnetic lines of force between the second wall 31b and the moving iron core 35.

[0115] In an embodiment where the metal shell 33 has an inner folded edge 331 formed at the second opening, the inner folded edge 331 may be sandwiched between the main body 34a and the second wall 31b. This ensures that the metal shell 33 is stably assembled between the first wall 31a and the second wall 31b.

[0116] It should be noted that in the embodiment where the first stationary iron core 34 includes a protrusion 34b, the protrusion 34b may be in contact with the second wall 31b or there may be a magnetically conductive gap between the protrusion and the second wall 31b, as long as the second wall 31b can conduct magnetic lines of force to the protrusion 34b to meet the needs of the first stationary iron core 34 to receive magnetic lines of force.

[0117] For example, as shown in Figures 3 and 4, in some embodiments, the second wall 31b is provided with a second hole 31d, and the protrusion 34b passes through the second hole 31d. In this embodiment, the protrusion 34b passes through the second hole 31d, thereby enabling the conduction of magnetic lines of force between the protrusion 34b and the second wall 31b.

[0118] For example, referring to Figure 8, 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 protrusion 34b, and magnetic lines of force can be conducted between the inner wall of the through hole 38a and the peripheral sidewall of the protrusion 34b, and magnetic lines of force can be conducted between the magnetizing element 38 and 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 34 by converging the magnetic lines of force; on the other hand, when the first stationary iron core 34 is assembled to the second wall 31b, the magnetizing element 38 can absorb assembly stress between the first stationary iron core 34 and the second wall 31b, thereby improving the connection stability between the first stationary iron core 34 and the second wall 31b.

[0119] In some embodiments, the magnetizing element 38 includes a collar 381 and a protruding edge 382. The protruding edge 382 is disposed around the periphery of the collar 381, which is sandwiched between the peripheral wall of the protrusion 34b and the inner wall of the second hole 31d. The protruding edge 382 is sandwiched between the main body 34a and the second wall 31b. The thickness of the protruding edge 382 in the direction of the centerline of the second hole 31d is greater than the wall thickness of the collar 381, thereby increasing the surface area of ​​the magnetizing element 38 opposite to the protrusion 34b and increasing the magnetic flux conducted by the magnetizing element 38 to the first stationary iron core 34, which in turn helps to increase the magnetic flux conducted through the first stationary iron core 34 to the moving iron core 35. Therefore, the relay 100 of the present application does not need to increase the number of turns of the coil 321 or increase the pull-in voltage. The electromagnetic force of the moving iron core 35 can be increased by using the magnetizing element 38, so that the relay 100 can be miniaturized while reducing the pull-in voltage.

[0120] It should be noted that in the above embodiment, since the collar 381 is sandwiched between the peripheral sidewall of the protrusion 34b and the inner wall of the second hole 31d, the collar 381 can absorb the assembly tolerance between the protrusion 34b and the second hole 31d. For example, if there is a machining error during the processing of the yoke assembly 31, resulting in poor coaxiality between the first hole 31c and the second hole 31d, then when assembling the protrusion 34b into the second hole 31d, it is necessary to increase the diameter of the second hole 31d to facilitate its fit with the protrusion 34b. Otherwise, the protrusion 34b is prone to interference with the inner wall of the second hole 31d, leading to assembly inconvenience or assembly stress. In this embodiment, since the collar 381 is sandwiched between the peripheral sidewall of the protrusion 34b and the inner wall of the second hole 31d, a certain assembly gap is allowed between the collar 381 and the peripheral sidewall of the protrusion 34b, and also between the collar 381 and the second hole 31d. In this way, the collar 381 can be used to absorb the assembly tolerance when the protrusion 34b is assembled to the second hole 31d, reduce the assembly stress, and thus improve the assembly stability between the first stationary iron core 34 and the second wall 31b.

[0121] In some embodiments, the assembly gap between the collar 381 and the peripheral sidewall of the protrusion 34b is smaller than the assembly gap between the collar 381 and the second hole 31d. That is, for these two assembly gaps, the assembly gap between the collar 381 and the peripheral sidewall of the protrusion 34b is smaller, which helps to improve the magnetic conductivity between the collar 381 and the peripheral sidewall of the protrusion 34b; correspondingly, the assembly gap between the collar 381 and the second hole 31d is larger, which helps to utilize the collar 381 to absorb the assembly tolerance when the protrusion 34b is assembled to the second hole 31d, thus reducing assembly stress.

[0122] In an embodiment where an inner folded edge 331 is formed at the second opening of the metal shell 33 and the magnetic circuit portion 30 includes a magnetizing member 38, the inner folded edge 331 is sandwiched between the main body portion 34a and the magnetizing member 38, thereby improving the assembly stability of the second end of the metal shell 33 by using the clamping of the inner folded edge 331 by the main body portion 34a and the magnetizing member 38.

[0123] Referring to Figure 9, in some embodiments, the magnetic circuit portion 30 further includes a magnetic guide cylinder 39. The magnetic guide cylinder 39 is fitted over the metal shell 33, and at least a portion of the moving iron core 35 and at least a portion of the first stationary iron core 34 are located inside the magnetic guide cylinder 39. In this embodiment, the magnetic guide cylinder 39 can be used to concentrate the magnetic lines of force generated by the energized coil 321 to the periphery of the first stationary iron core 34, facilitating the conduction of the magnetic lines of force from the first stationary iron core 34 to the moving iron core 35.

[0124] It should be noted that magnetic lines of force can be conducted between one end of the magnetic cylinder 39 and the yoke assembly 31. For example, in some embodiments, magnetic lines of force can be conducted between the magnetic cylinder 39 and the second wall 31b. In this way, the magnetic lines of force in the second wall 31b can be conducted to the magnetic cylinder 39, thereby concentrating the magnetic lines of force around the periphery of the first stationary iron core 34.

[0125] In some embodiments, the first stationary iron core 34 is not limited to having a portion of its structure disposed within the metal shell 33; it may also have its entire structure located outside the metal shell 33. In embodiments where the entire structure of the first stationary iron core 34 is located outside the metal shell 33, a portion of the moving iron core 35 is located within the metal shell 33, so that a portion of the moving iron core 35 is accommodated in the recess 341 of the first stationary iron core 34, thereby accommodating the need for the outer sidewall of the moving iron core 35 to be opposite to the inner sidewall of the recess 341 and for magnetic lines of force to be conducted between them.

[0126] Referring to Figure 10, in some embodiments, the second end of the metal shell 33 may be connected to the end face of the recessed portion 341 of the first stationary iron core 34. Thus, the first stationary iron core 34 is located outside the space enclosed by the metal shell 33; that is, the metal shell 33 does not cover the outer peripheral wall of the first stationary iron core 34. Therefore, the metal shell 33 does not occupy the peripheral space of the first stationary iron core 34, which is beneficial for miniaturization of the relay 100. It also allows the magnetic cylinder 39 to be positioned closer to the outer peripheral wall of the first stationary iron core 34, and the magnetic lines of force between the magnetic cylinder 39 and the outer peripheral wall of the first stationary iron core 34 will not penetrate the wall thickness of the metal shell 33. Therefore, this structural arrangement further improves the effect of the magnetic cylinder 39 in concentrating the magnetic lines of force on the periphery of the first stationary iron core 34, facilitating the transmission of the magnetic lines of force from the first stationary iron core 34 to the moving iron core 35.

[0127] It should be noted that the magnetic guide cylinder 39 can be omitted. For example, as shown in Figure 11, the magnetic circuit portion 30 does not have a magnetic guide cylinder 39. In this case, there is no need to reserve a mounting gap between the side wall of the mounting hole 32a of the coil assembly 32 and the outer peripheral wall of the first stationary iron core 34 for the magnetic guide cylinder 39. Therefore, the default design of the magnetic guide cylinder 39 helps to reduce the gap between the side wall of the mounting hole 32a of the coil assembly 32 and the outer peripheral wall of the first stationary iron core 34. This allows the coil assembly 32 and the first stationary iron core 34 to be arranged more compactly, thereby reducing the size of the relay 100 and achieving miniaturization. Of course, in this embodiment, the space saved by omitting the magnetic guide cylinder 39 can also be used to increase the number of turns of the coil 321, or the space saved by omitting the magnetic guide cylinder 39 can be used to install a larger first stationary iron core 34. Both increasing the number of turns of the coil 321 and increasing the size of the first stationary iron core 34 are beneficial to improving electromagnetic strength, thereby helping to reduce the pull-in voltage of the relay 100. Therefore, it can be seen that the design of the default magnetic cylinder 39 in this embodiment is beneficial to achieving both miniaturization of the relay 100 and reduction of the pull-in voltage. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0128] 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 relay, characterized in that, The relay includes a contact portion, a pushing mechanism, and a magnetic circuit portion. The contact portion includes a stationary contact and a moving contact. The pushing mechanism is used to drive the moving contact to make contact with or break contact with the stationary contact. The pushing mechanism includes a pushing rod. 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 the 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 shell is fixedly disposed in the mounting hole. The metal shell is disposed around the axial direction of the push rod. The metal shell has a first end and a second end along the axial direction of the push rod. The first end forms a first opening, and the second end forms a second opening. The first hole is opposite to the first opening along the axial direction of the push rod, so that a part of the structure of the push rod can extend into the metal shell through the first opening. A first stationary iron core, at least a portion of the structure of the first stationary iron core is opposite to the second opening along the axial direction of the push rod, and is used to conduct magnetic lines of force with the second wall, such that at least a portion of the magnetic lines of force conducted between the first stationary iron core and the second wall passes through the second opening, and a recess is provided on the side of the first stationary iron core facing the first wall. A moving iron core is used to drive the push rod to move axially relative to the yoke assembly; at least a portion of the structure of the moving iron core is housed in the recess, and in the axial direction perpendicular to the push rod, the outer sidewall of the moving iron core is opposite to the inner sidewall of the recess and magnetic lines of force can be conducted between them.

2. The relay according to claim 1, characterized in that The first wall is sealed to the first end, and the first wall closes the first opening. The first stationary iron core is sealed to the second end, and the first stationary iron core closes the second opening.

3. The relay according to claim 1 or 2, characterized in that, The moving iron core includes a first magnetically conductive part and a second magnetically conductive part. The first magnetically conductive part has a magnetic pole surface facing the first wall. The second magnetically conductive part is connected to the side of the first magnetically conductive part facing away from the magnetic pole surface. At least a portion of the structure of the first magnetically conductive part is located inside the metal shell and outside the recess. At least a portion of the structure of the second magnetically conductive part is housed in the recess. The outer side wall of the second magnetically conductive part is opposite to the inner side wall of the recess, and magnetic lines of force can be conducted between them.

4. The relay according to claim 3, characterized in that, The area of ​​the magnetic pole surface is greater than the area of ​​the orthographic projection region of the second magnetic conductive part on the magnetic pole surface.

5. The relay according to claim 3, characterized in that, The second magnetic conductive part is ring-shaped and is arranged around the axial direction of the push rod.

6. The relay according to claim 5, characterized in that, The peripheral surface of the first magnetic conductive part is a cylindrical surface, and the first magnetic conductive part and the second magnetic conductive part are coaxially arranged along the axial direction of the push rod.

7. The relay according to claim 6, characterized in that, There is an assembly gap between the first magnetic conductive part and the inner wall of the metal shell, and there is a magnetic conductive gap between the outer wall of the second magnetic conductive part and the side wall of the recessed part. The assembly gap is smaller than the magnetic conductive gap.

8. The relay according to claim 7, characterized in that, The magnetic gap is less than or equal to 0.5 mm.

9. The relay according to claim 7, characterized in that, At least one of the first stationary iron core and the moving iron core is provided with a magnetic shielding layer, and at least a portion of the structure of the magnetic shielding layer is located within the magnetically conductive gap.

10. The relay according to claim 1, characterized in that, It also includes at least one of the following technical solutions: The metal shell has an outward folded edge at the first opening, and the outward folded edge is sealed to the first wall; Alternatively, the metal shell may form an inner fold at the second opening, and the inner fold is sealed to the first stationary iron core.

11. The relay according to claim 1, characterized in that, The first stationary iron core includes a main body and a protrusion. The recess is disposed on the main body, and the protrusion protrudes from the end face of the main body facing away from the moving iron core. The protrusion and the second wall are capable of conducting magnetic lines of force.

12. The relay according to claim 11, characterized in that, The metal shell forms an inner fold at the second opening, and the inner fold is sealed to the first stationary iron core. The inner fold is sandwiched between the main body and the second wall.

13. The relay according to claim 11, characterized in that, The magnetic circuit portion also includes a magnetizing component, which has a through hole. The magnetizing component is sleeved on the protrusion. Magnetic lines of force can be conducted between the inner wall of the through hole and the peripheral side wall of the protrusion, and magnetic lines of force can be conducted between the magnetizing component and the second wall.

14. The relay according to claim 13, characterized in that, 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 wall of the protrusion and the inner wall of the second hole. The protruding edge is sandwiched between the main body and the second wall. The thickness of the protruding edge in the centerline direction of the second hole is greater than the wall thickness of the collar.

15. The relay according to claim 14, characterized in that, The assembly gap between the collar and the peripheral sidewall of the protrusion is smaller than the assembly gap between the collar and the second hole.

16. The relay according to any one of claims 13 to 15, characterized in that, The metal shell has an inner folded edge at the second opening, and the inner folded edge is sealed to the first stationary iron core. The inner folded edge is sandwiched between the main body and the magnetizing component.

17. The relay according to claim 1, characterized in that, The relay also includes a ceramic cover and a frame. The ceramic cover is disposed on the side of the first wall facing away from the moving iron core, and the ceramic cover is sealed to the first wall through the frame. There are two static contact members, both of which pass through the top wall of the ceramic cover and are spaced apart from each other. The pushing mechanism includes a pushing seat, the moving contact member is connected to the pushing seat, and both are disposed in the ceramic cover. The pushing rod is connected between the pushing seat and the moving iron core.

18. The relay according to claim 17, characterized in that, The frame is made of metal, and the ceramic cover is brazed to the frame.

19. The relay according to claim 1, 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.

20. The relay according to claim 1, characterized in that, The first wall has a protrusion extending toward the side where the moving iron core is located, and at least a portion of the structure of the protrusion extends into the metal shell through the first opening.

21. The relay according to claim 20, characterized in that, The sidewall of the protrusion is in contact with the inner wall of the metal shell; or, the side of the protrusion facing the moving iron core is transitioned to the sidewall of the protrusion by a rounded corner.

22. The relay according to claim 20 or 21, characterized in that, The protrusion is formed on the first wall by casting, or the protrusion is formed on the first wall by stamping.

23. The relay according to claim 1, characterized in that, The magnetic circuit section further includes a magnetic guide cylinder, which is sleeved on the outside of 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.

24. 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 apart along the axial direction of the push rod. When the coil assembly is energized, the moving iron core can drive the push rod to move axially relative to the yoke assembly under the guidance of the metal shell.

25. The relay according to claim 1, characterized in that, When the moving iron core drives the push rod to move, at least a portion of the structure of the moving iron core is located inside the metal shell.

26. The relay according to claim 24 or 25, characterized in that, When the coil assembly is not energized, a portion of the moving iron core is located inside the metal shell, and another portion is located outside the metal shell.

27. The relay according to claim 26, characterized in that, At least a portion of the structure of the first stationary iron core is located within the metal shell.

28. The relay according to claim 1, characterized in that, The entire structure of the first stationary iron core is located outside the metal shell.

29. The relay according to claim 28, characterized in that, The second end of the metal shell is connected to the end face of the first stationary iron core that forms the recess.

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