Magnetic circuit part and direct-acting relay

Abstract

The utility model discloses a magnetic circuit part and a direct-acting relay, the magnetic circuit part is used for the direct-acting relay, the magnetic circuit part is additionally provided with a lining part, at least part of the lining part is located between a magnetic conductive plate and a magnetic conductive sleeve in the extension direction of a coil frame shaft hole, and the lining part and a magnetic conductive sleeve insert are integrally formed in an injection molding mode. The lining part is arranged around the movable iron core, and the attraction face, facing the movable iron core, of the magnetic conductive plate abuts against the first end face, facing the magnetic conductive plate, of the lining part. The direct-acting relay comprises the magnetic circuit part. By adopting the technical scheme, the direct-acting relay can be ensured to be closed under rated closing voltage.

Description

Technical Field

[0001] This application relates to the field of relays, specifically to a magnetic circuit section and a direct-acting relay. Background Technology

[0002] See Figure 1 , Figure 1 The magnetic circuit portion 100 and contact portion of a prior art direct-acting relay are shown. For example... Figure 1 As shown, in the prior art, the magnetic circuit portion 100 of a direct-acting relay includes a coil frame 110, a coil 120, a magnetic plate 130, a magnetic sleeve 140, a magnetic component 150, a moving iron core 160, and a first elastic component 170. The coil frame 110 has a shaft hole extending along a first direction Z. The coil 120 is wound on the coil frame 110, and its winding axis extends along the first direction Z. The magnetic plate 130 is located at one end of the coil frame 110 along the first direction Z and abuts against the retaining wall of the coil frame 110. The magnetic sleeve 140 is located in the shaft hole and fixedly connected to the coil frame 110. Specifically, a radially protruding protrusion a is provided in the middle of the shaft hole along the first direction Z. The protrusion a forms a stop surface along the lower surface of the first direction Z. The magnetic sleeve 140 is inserted into the shaft hole from bottom to top along the first direction Z and is interference-fitted with the shaft hole. After insertion, the magnetic sleeve 140 abuts against the stop surface formed by the protrusion a at its upper end along the first direction Z, and extends out of the shaft hole at its lower end along the first direction Z. The magnetic component 150 is arranged around the coil frame 110 and connects the magnetic plate 130 and the magnetic sleeve 140. The magnetic component 150 can be cup-shaped or U-shaped, and can be integrally formed with the magnetic sleeve 140 or separate from it. The moving iron core 160 slides within the shaft hole with the magnetic sleeve 140 along the first direction Z to attract or move away from the magnetic plate 130. The first elastic member 170 is positioned between the magnetic plate 130 and the moving iron core 160 along the first direction Z. For a direct-acting non-magnetic latching relay, when the coil 120 is energized, the resulting magnetic force causes the moving iron core 160 to attract the magnetic plate 130 upwards along the first direction Z, thereby forming a magnetic circuit between the moving iron core 160, the magnetic plate 130, the magnetic element 150, and the magnetic sleeve 140. When the coil 120 is de-energized, the moving iron core 160 is driven downwards along the first direction Z away from the magnetic plate 130 by the first elastic element 170. The contact portion of the direct-acting relay includes a pusher, a moving contact, and two stationary contacts. The moving contact has two moving contacts corresponding to the two stationary contacts. The moving iron core is fixedly connected to the pusher, and the pusher drives the moving contact to move along the first direction Z, causing the moving contact to close or open with the corresponding stationary contact, thereby connecting or disconnecting the load circuit. For a direct-acting magnetic latching relay, the structure is basically the same, except that a permanent magnet is added to the middle of the coil 120 along the first direction Z, so that the moving iron core 160 is held in the attracted position or the unattended position.

[0003] The main drawback of the above technical solution is that, during actual testing and operation, it was found that some direct-acting relays failed to close under the rated closing voltage. Utility Model Content

[0004] The purpose of this application is to overcome the aforementioned defects or problems in the prior art and to provide a magnetic circuit section and a direct-acting relay that, compared with the prior art, can better guarantee that the direct-acting relay will close under the rated closing voltage.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] The first technical solution relates to a magnetic circuit component for a direct-acting relay, comprising: a coil frame having a shaft hole extending along a first direction; a magnetic plate located at one end of the coil frame along the first direction; a magnetic sleeve fixedly connected to the coil frame and located within the shaft hole; a moving iron core slidingly engaged with the magnetic sleeve along the first direction within the shaft hole to attract or move away from the magnetic plate; and a bushing portion at least partially located between the magnetic plate and the magnetic sleeve along the first direction and integrally injection molded with the magnetic sleeve insert, the bushing portion surrounding the moving iron core, and the attracting surface of the magnetic plate towards the moving iron core abutting against the first end face of the bushing portion towards the magnetic plate.

[0007] The second technical solution is based on the first technical solution, wherein the bushing, the coil frame, and the magnetic sleeve insert are integrally injection molded.

[0008] The third technical solution is based on the first or second technical solution, wherein the bushing is made of a non-magnetic material and slides in cooperation with the moving iron core along the first direction.

[0009] The fourth technical solution is based on the third technical solution, wherein the bushing portion is provided with a body, the body is located between the magnetic plate and the magnetic sleeve along a first direction, and the first end face is formed on the body.

[0010] The fifth technical solution is based on the fourth technical solution, wherein the bushing portion is further provided with a protruding post, the protruding post extending from the body toward the first end face of the magnetic plate along a first direction; the magnetic plate is provided with a connecting hole corresponding to the protruding post, and the protruding post is inserted into the connecting hole.

[0011] The sixth technical solution is based on the fifth technical solution, wherein the magnetic plate and the bushing are fixed by hot riveting the protrusion or by interference fit between the connecting hole and the protrusion.

[0012] The seventh technical solution is based on the fifth technical solution, wherein the number of protrusions is at least two, and each protrusion is evenly distributed around the moving iron core on the first end face of the body.

[0013] The eighth technical solution is based on the fourth technical solution, wherein the bushing portion is further provided with a rib, the rib extending from the second end face of the body away from the magnetic plate along a first direction; the magnetic sleeve is provided with a fitting hole corresponding to the rib, and the rib fitting into the fitting hole along the first direction.

[0014] The ninth technical solution is based on the eighth technical solution, wherein the number of the protruding ribs is at least two, and each protruding rib is evenly distributed around the moving iron core on the second end face of the body.

[0015] The tenth technical solution is based on the eighth technical solution, wherein the fitting hole has an opening facing the moving iron core, and the edge of the opening is rounded.

[0016] The eleventh technical solution relates to a direct-acting relay, which includes a contact portion and a magnetic circuit portion as described in any one of the first to tenth technical solutions; the contact portion includes a moving contact and a stationary contact; the moving iron core drives the moving contact to close or open with the stationary contact along a first direction.

[0017] The twelfth technical solution is based on the eleventh technical solution, wherein the contact part includes a pusher and a moving contact. The moving contact has two moving contacts, and the stationary contacts have two stationary contacts corresponding to the two moving contacts. The pusher is fixedly connected to the moving iron core to drive the moving contact along the first direction, so that the two moving contacts and the two stationary contacts close or open along the first direction.

[0018] The thirteenth technical solution is based on the twelfth technical solution, wherein the contact portion further includes a positioning component, the two stationary contacts abut against the positioning component along a first direction and are positioned by the positioning component, and the positioning component abuts against the magnetic plate along the first direction and is positioned by the magnetic plate.

[0019] The fourteenth technical solution is based on the thirteenth technical solution. In this solution, the magnetic circuit part further includes a magnetic guide component. The magnetic guide component is connected to the magnetic guide plate and the magnetic guide sleeve. When the two moving contacts are disconnected from the two stationary contacts, the end of the pusher that is away from the moving contacts abuts against the magnetic guide component in a first direction.

[0020] Compared with existing technologies, the above solution has the following beneficial effects:

[0021] Through continuous experimentation, observation, and analysis, the applicant discovered that the low contact life of some direct-acting relays in the prior art is due to the tendency of the moving iron core to deviate relative to the magnetic plate during its upward movement in the first direction until it engages with the magnetic plate. This deviation causes additional resistance to the moving iron core, guided by the magnetic sleeve, during the closing stroke, resulting in failure to close at the rated closing voltage. When the magnetic sleeve is an oil-free bearing, the moving iron core may also scrape against the Teflon layer on the inner surface of the oil-free bearing, causing the Teflon layer to fall off and further aggravating the jamming. Furthermore, when an elastic element is placed between the pusher and the magnetic plate, the low perpendicularity between the magnetic sleeve and the magnetic plate prevents the moving iron core from adhering tightly to the magnetic plate during engagement, resulting in an air gap on one side. Under the action of the first elastic element, this can easily cause engagement jitter, affecting the electrical life of the contacts. The deviation of the moving iron core may also cause inconsistent contact gaps between the two moving contacts and their corresponding stationary contacts, which, under the action of engagement jitter, may even lead to an explosion.

[0022] The first technical solution adds a bushing section compared to the prior art. Since the bushing section surrounding the moving iron core is integrally molded with the magnetic sleeve insert, and the magnetic plate's contact surface abuts against the first end face of the bushing section, and because the area of ​​the first end face of the bushing section is smaller than the area of ​​the end face of the coil frame's retaining wall, it is easier to ensure flatness. Therefore, it can guarantee the perpendicularity of the first end face of the bushing section, the contact surface of the magnetic plate, and the guide channel formed by the magnetic sleeve. Thus, compared to the prior art, it better ensures that the direct-acting relay achieves closure at the rated closing voltage.

[0023] Meanwhile, the first technical solution ensures the perpendicularity of the guide channel formed by the magnetic plate and the magnetic sleeve, thus further avoiding engagement jitter and better guaranteeing the electrical life of the contacts.

[0024] In the second technical solution, the bushing, coil frame, and magnetic sleeve insert are integrally injection molded, which is a preferred embodiment of the first technical solution. This method involves fewer assembly steps and ensures the coaxiality of the guide channel formed by the magnetic sleeve and the coil frame shaft hole. While ensuring the magnetic efficiency of the magnetic circuit, it also ensures that the direction of movement of the moving iron core is consistent with the direction of closure of the moving contact. The contact between the moving contact and the two stationary contacts is more reliable.

[0025] In the third technical solution, the bushing is made of a non-magnetic material and slides in conjunction with the moving iron core along the first direction. This ensures that the moving iron core is fully guided during its upward movement along the first direction and its attraction to the magnetic plate. Therefore, the moving iron core is less prone to deflection during its upward movement compared to existing technologies. The contact pressure between the two moving contacts and their corresponding stationary contacts is more balanced, allowing the moving contacts to close more reliably with the stationary contacts. Compared to existing technologies, this better ensures that the resistance value of the direct-acting relay meets design requirements when closed. Furthermore, during the disconnection process between the moving contacts and the stationary contacts, the arc is extinguished more easily and correctly, resulting in a longer contact life and a longer lifespan for the direct-acting relay compared to existing technologies.

[0026] In the fifth technical solution, the magnetic plate is fixed relative to the bushing by the insertion and engagement of the protruding post and the connecting hole of the magnetic plate, thus preventing the perpendicular relationship between the magnetic plate and the guide channel from being changed by external factors.

[0027] In the sixth technical solution, the magnetic plate and the bushing are fixed together by hot riveting or interference fit, so that the magnetic plate, bushing and magnetic sleeve form a solid whole, ensuring the perpendicularity of the axis of the magnetic sleeve to the magnetic plate and the coaxiality of the bushing and the magnetic sleeve.

[0028] In the seventh technical solution, the protruding pillars are evenly distributed around the moving iron core on the first end face, so that the magnetic plate can reliably abut against the first end face of the body at various positions along the circumferential direction.

[0029] In the eighth technical solution, by providing a raised rib on the bushing portion and fitting it into the fitting hole of the magnetic sleeve, the connection between the bushing portion and the magnetic sleeve is made tighter. The magnetic sleeve will not shift or rotate relative to the bushing portion due to external factors.

[0030] In the ninth technical solution, each rib is arranged around the moving iron core on the second end face of the main body, which can improve the bonding strength between the magnetic sleeve and the bushing.

[0031] In the tenth technical solution, the opening edge of the fitting hole is rounded, which can prevent the magnetic sleeve or rib from producing burrs on the edge of the fitting hole, so the movement of the moving iron core along the first direction is smoother.

[0032] The eleventh and twelfth technical solutions are applications of the magnetic circuit portion defined by the technical solutions they reference in direct-acting relays, and therefore have corresponding technical effects.

[0033] In the thirteenth technical solution, the magnetic plate's contact surface abuts against the first end face of the bushing. Since the area of ​​the first end face of the bushing is smaller than the area of ​​the end face of the coil frame's retaining wall, it is easier to ensure flatness. Therefore, it can ensure the perpendicularity of the first end face of the bushing and the magnetic plate's contact surface to the guide channel. The positioning component is positioned by the magnetic plate and positions the two stationary contacts by abutting against them. The positioning reference of the two stationary contacts is based on the magnetic plate and the bushing. Therefore, it is more likely to ensure that the two stationary contacts are less likely to deviate relative to the magnetic plate and the guide channel than in the prior art.

[0034] The fourteenth technical solution, based on the thirteenth technical solution, further limits the end of the pusher that is far from the moving contact to abut against the magnetic guide when the moving contact and the stationary contact are disconnected. Based on the fact that the two stationary contacts are less likely to deviate relative to the magnetic guide plate and the guide channel than the prior art, it further improves the consistency of the contact gap between the two stationary contacts and the corresponding moving contact compared to the prior art. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments, the accompanying drawings used are briefly described below:

[0036] Figure 1 This is a schematic diagram of the structure of a direct-acting relay in the prior art;

[0037] Figure 2 This is a schematic diagram of the direct-acting relay in Example 1;

[0038] Figure 3 This is a perspective view of the magnetic conductive plate in Embodiment 1;

[0039] Figure 4 This is a perspective view of the magnetic sleeve in Embodiment 1;

[0040] Figure 5 This is a schematic diagram of the bushing portion in Embodiment 1;

[0041] Figure 6 This is a schematic diagram of the insert injection molded body in Example 1;

[0042] Figure 7 This is a schematic diagram of the direct-acting relay in Embodiment 2;

[0043] Figure 8 This is a schematic diagram of the direct-acting relay in Example 3.

[0044] Description of main reference numerals:

[0045] 1. Direct-acting relay; 100. Magnetic circuit part; 110. Coil frame; 111. Shaft; 112. Barrier; 113. Protrusion; 114. Shaft hole; 120. Coil; 130. Magnetic guide plate; 131. Connecting hole; 132. Mounting hole; 140. Magnetic guide sleeve; 141. Fitting hole; 150. Magnetic guide component; 160. Moving iron core; 161. Spring mounting hole; 162. Glue injection groove; 170. First elastic element; 180. Bushing part; 81. Body; 182. Protruding post; 183. Protruding rib; 190. Insert injection molded body; 200. Contact part; 210. Pushing member; 211. Push rod; 212. Pushing seat; 220. Moving contact; 221. Moving contact point; 230. Second elastic member; 240. Stationary contact; 241. Stationary contact point; 250. Positioning assembly; 251. First positioning member; 252. Second positioning member; 300. Housing; a. Protrusion; Z. First direction. Detailed Implementation

[0046] Unless otherwise specified, the terms “first,” “second,” or “third,” etc., in the claims and description are used to distinguish different objects and not to describe a particular order.

[0047] Unless otherwise specified, in the claims and description, the terms “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “clockwise,” “counterclockwise,” etc., indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only for the purpose of simplifying the description, and do not imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation.

[0048] Unless otherwise specified in the claims and description, the terms "fixed connection" or "fixed connection" shall be interpreted broadly to mean any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection, and fixed connection by other means or components.

[0049] Unless otherwise specified, the terms “comprising,” “having,” and variations thereof in the claims and description shall mean “including but not limited to.”

[0050] In the claims and description, unless otherwise specified, the term "have" means that a technical feature that follows is part of a technical feature that precedes it.

[0051] The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings.

[0052] Example 1

[0053] See Figure 2 , Figure 2 The direct-acting relay 1 in Embodiment 1 is shown. For example... Figure 2 As shown, the direct-acting relay 1 includes a magnetic circuit portion 100, a contact portion 200, and a housing 300.

[0054] like Figure 2 As shown, the magnetic circuit part 100 includes a coil frame 110, a coil 120, a magnetic plate 130, a magnetic sleeve 140, a magnetic component 150, a moving iron core 160, a first elastic component 170, and a bushing part 180, wherein the magnetic sleeve 140 and the bushing part 180 are integrally molded to form an insert injection molded body 190.

[0055] like Figure 2 As shown, the coil frame 110 is made of plastic. The coil frame 110 includes a shaft 111 and two retaining walls 112. The shaft 111 extends along a first direction Z, and the two retaining walls are perpendicular to the first direction Z and located at opposite ends of the shaft 111 along the first direction Z. The retaining wall located upwards along the first direction Z has a protrusion 113 extending upwards along the first direction Z. The coil frame 110 has a central shaft hole 114 that penetrates the shaft 111 and the two retaining walls 112 along the first direction Z. In this embodiment, the cross-section of the shaft hole 114 is circular.

[0056] like Figure 2 As shown, coil 120 is wound on shaft 111 of coil holder 110. The winding axis of coil 120 extends along the first direction Z, which is consistent with the axis of shaft hole 114.

[0057] See Figure 3 , Figure 3 The magnetic plate 130 in this embodiment is shown. (As shown...) Figure 2 and Figure 3 As shown, the magnetic plate 130 is made of a magnetically conductive material. The magnetic plate 130 is located at the upper end of the coil frame 120 along the first direction Z. The magnetic plate 130 has four connecting holes 131 and two mounting holes 132, with the mounting holes 132 for the protrusion 113 to pass through. The protrusion 113 is interference-fitted with the mounting holes 132 or fixed by hot riveting.

[0058] See Figure 4 , Figure 4 The magnetic sleeve 140 in this embodiment is shown. (As shown...) Figure 2 and Figure 4As shown, the magnetic sleeve 140 is made of a magnetically conductive material. In this embodiment, the magnetic sleeve 140 is an oil-free bearing with a wear-resistant layer on its inner surface. The wear-resistant layer has a low coefficient of friction, and the specific material of the wear-resistant layer is Teflon. In this embodiment, the magnetic sleeve 140 is annular and surrounds the moving iron core 160. The magnetic sleeve 140 is located in the lower middle part of the shaft hole 114 along the first direction Z, and the lower end of the magnetic sleeve 140 extends out of the shaft hole 114. In this embodiment, six fitting holes 141 are evenly distributed along the circumferential direction on the wall of the magnetic sleeve 140, and the six fitting holes 141 extend along the first direction Z. In other embodiments, the number of fitting holes 141 may be two or more. Each fitting hole 141 has an opening facing the moving iron core 160, and the edge of the opening is rounded. In other embodiments, the fitting holes 141 may also be located inside the side wall of the magnetic sleeve 140 or open on the outer side wall of the magnetic sleeve 140.

[0059] like Figure 2 As shown, the magnetic conductor 150 is made of a magnetically conductive material. The magnetic conductor 150 is arranged around the coil frame 110 and is cup-shaped or U-shaped; in this embodiment, it is cup-shaped. The cup-shaped sidewall of the magnetic conductor 150 is connected to the magnetically conductive plate 130. The cup-shaped bottom wall of the magnetic conductor 150 is connected to the lower end of the magnetically conductive sleeve 140.

[0060] like Figure 2 As shown, the moving iron core 160 slides within the shaft hole 114 and the magnetic sleeve 140 along the first direction Z to attract or move away from the magnetic plate 130. A threaded hole is provided at the center of the moving iron core 160 along the middle of the first direction Z. Above the threaded hole is a spring mounting hole 161, the diameter of which is larger than the diameter of the threaded hole. Below the threaded hole is a glue injection groove 162, the diameter of which is larger than the diameter of the threaded hole.

[0061] like Figure 2 As shown, the first elastic element 170 extends along the first direction Z, with its upper end abutting against the magnetic plate 130 and its lower end located inside the spring mounting hole 161 and abutting against the moving iron core 160. The first elastic element 170 deforms and stores energy during the process of the moving iron core 160 moving upward along the first direction Z until it is attracted to the magnetic plate 130, and releases energy by restoring its deformation to push the moving iron core 160 downward along the first direction Z away from the magnetic plate 130.

[0062] See Figure 5 and Figure 6 , Figure 5 and Figure 6 This embodiment shows an insert injection molded body 190, which is integrally injection molded from the bushing portion 180 and the magnetic sleeve 140 insert in this embodiment. For example... Figure 5As shown, the bushing portion 180 in this embodiment is made of plastic. The bushing portion 180 has a body 181, four protruding pillars 182, and six protruding ribs 183. Of course, the number of protruding pillars 182 and the number of protruding ribs 183 can also be two or more. For example... Figure 2 As shown, the body 181 is located between the magnetic plate 130 and the magnetic sleeve 140 along the first direction Z. The body 181 is annular and surrounds the moving iron core 160. In this embodiment, the body 181 and the moving iron core 160 are in sliding engagement along the first direction Z. In other embodiments, the body 181 may not be in sliding engagement with the moving iron core 160. Figure 2 and Figure 5 As shown, the first end face of the main body 181 facing the magnetic guide plate 130 abuts against the contact surface of the magnetic guide plate 130 facing the moving iron core 160. Four protrusions 182 extend from the first end face along the first direction Z and are evenly distributed around the moving iron core 160 on the first end face. The four protrusions 182 are respectively inserted into the corresponding connecting holes 131. Specifically, the magnetic guide plate 130 can be riveted to the bushing part 180 by the protrusions 182 or the protrusions 182 can be interference-fitted with the connecting holes 131, so that the magnetic guide plate 130 and the bushing 180 are firmly connected together. Figure 5 and Figure 6 As shown, six raised ribs 183 extend from the second end face of the main body 181 away from the magnetic guide plate 130 along the first direction Z and are evenly distributed around the moving iron core 160 on the second end face. The six raised ribs 183 are respectively fitted into six fitting holes 141. In this embodiment, the bushing part 180 and the magnetic guide sleeve 140 are integrally formed by insert injection molding to form the insert injection body 190. The magnetic guide plate 130 is tightly fixed to the insert injection body 190 through the interference fit between the connecting hole 131 and the raised post 182. Then, the insert injection body 190 is interference fitted with the shaft hole 114 to fix the insert injection body 190 and the magnetic guide plate 130 relative to the coil frame 110.

[0063] like Figure 2 As shown, the contact portion includes a pusher 210, a moving contact 220, a second elastic member 230, and two stationary contacts 240.

[0064] like Figure 2As shown, the pusher 210 includes a push rod 211 and a push seat 212. The push seat 212 is fixedly connected to the top end of the push rod 211 along the first direction Z. The push rod 211 extends along the first direction Z and is fixedly connected to the moving iron core 160. Specifically, the push rod 211 and the moving iron core 160 are also threaded together. After the push rod 211 and the moving iron core 160 are threaded together, glue is injected into the glue injection groove 162 to reliably keep the push rod 211 and the moving iron core 160 relatively fixed. In this embodiment, when the bottom end of the push rod 211 abuts against the bottom wall of the magnetic guide 150, the moving iron core 160 moves downward along the first direction Z to reach its limit position. At this time, the moving iron core 160 is still in sliding engagement with the bushing 180 and the magnetic guide sleeve 140. Similarly, the moving iron core 160 moves upward along the first direction until it is attracted to the contact surface of the magnetic guide plate 130, reaching its limit position. At this time, the moving iron core 160 is still in sliding engagement with the bushing part 180 and the magnetic sleeve 140.

[0065] like Figure 2 As shown, the movable contact 220 is located above the push base 212 along the first direction Z. The movable contact 220 is provided with a bridging part and two movable contacts 221. The two movable contacts 221 are arranged upward along the first direction Z. The bridging part bridges the two movable contacts 221 and is made of conductive material.

[0066] like Figure 2 As shown, the second elastic member 230 extends along the first direction Z, with its upper end abutting against the movable contact member 220 and its lower end abutting against the push seat 212. The function of the second elastic member 230 will be described in detail later.

[0067] like Figure 2 As shown, two stationary contacts 240 are arranged perpendicular to the first direction Z, and each is provided with a stationary contact 241. The stationary contact 241 is arranged downward along the first direction Z and is opposite to the corresponding moving contact 221.

[0068] like Figure 2 As shown, the housing 300 is used to house the magnetic circuit portion 100 and the contact portion 200. The coil frame 110, coil 120, magnetic plate 130, magnetic sleeve 140, magnetic component 150, bushing portion 180, and two stationary contacts 240 are all fixed relative to the housing 300. The moving iron core 160, pushing member 210, and moving contact 220 all move relative to the housing 300 along a first direction Z. The first elastic member 170 and the second elastic member 230 both elastically deform relative to the housing 300 along the first direction.

[0069] The direct-acting relay 1 in this embodiment also includes two coil terminals and two load terminals extending out of the housing 300. The two coil terminals are electrically connected to the coil 120 and externally connected to a signal circuit. The two load terminals are electrically connected to two stationary contacts 240 respectively and externally connected to a load circuit.

[0070] In this embodiment, the direct-acting relay 1, when the signal circuit applies voltage to the two coil terminals to energize the coil 120, the magnetic field generated by the coil 120 pushes the moving iron core 160 upward along the first direction Z within the guide channel formed by the magnetic sleeve 140 and the bushing portion 180. During this process, the first elastic member 170 is compressed and deformed, storing energy. As the moving iron core 160 moves upward, the pusher 210 fixed to the moving iron core 160 also moves upward, and drives the moving contact 220 upward through the second elastic member 230 until the moving contact 221 abuts against the corresponding stationary contact 241. The external load circuit is then connected through one of the stationary contacts 240, the moving contact 221, and the other stationary contact 240. After the moving contact 221 abuts against the corresponding stationary contact 241, the moving iron core 160 continues to move upward until it is attracted to the magnetic plate 130. During this process, the pusher 210 continues to move upward to form an overtravel, and the second elastic element 230 is compressed and deformed and stores energy, so that the moving contact 221 closes more reliably with the stationary contact 241.

[0071] This embodiment adds a bushing portion 180 compared to the prior art. Since the bushing portion 180 surrounding the moving iron core 160 is integrally injection molded with the magnetic sleeve 140 insert, and the magnetic plate 130's contact surface abuts against the first end face of the bushing portion 180, it not only ensures the perpendicularity of the first end face of the bushing portion 180 and the magnetic plate 130's contact surface to the guide channel formed by the magnetic sleeve 140, but also, because the area of ​​the first end face of the bushing portion 180 is smaller than the area of ​​the end face of the retaining wall 112 of the coil frame 110, it is easier to ensure flatness. Therefore, compared to the prior art, it better ensures that the direct-acting relay 1 achieves closure under the rated closing voltage.

[0072] In this embodiment, by ensuring the perpendicularity of the guide channel formed by the magnetic plate 130 and the magnetic sleeve 140, it is possible to further avoid engagement jitter and better ensure the electrical life of the contacts.

[0073] In this embodiment, the bushing 180 is made of a non-magnetic material and slides in conjunction with the moving iron core 160 along the first direction Z, ensuring that the moving iron core 160 is fully guided during its upward movement along the first direction Z and its attraction with the magnetic plate 130. Therefore, the moving iron core 160 is less prone to deflection during its upward movement compared to existing technologies. The contact pressure between the two moving contacts 221 and the corresponding stationary contacts 241 is more balanced, allowing the moving contacts 221 to close more reliably with the stationary contacts 241. Compared to existing technologies, this better ensures that the resistance value of the direct-acting relay 1 meets design requirements when closed. During the disconnection process between the moving contacts 221 and the stationary contacts 241, the arc is more easily and correctly extinguished, resulting in a longer contact life and a longer lifespan for the direct-acting relay 1 compared to existing technologies.

[0074] In this embodiment, the magnetic plate 130 is fixed relative to the bushing portion 180 by the insertion and engagement of the protrusion 182 with the connection hole 131 of the magnetic plate 130, thus preventing the perpendicular relationship between the magnetic plate 130 and the guide channel from being changed by external factors.

[0075] In this embodiment, the magnetic plate 130 and the bushing 180 are fixed together by hot riveting or interference fit, so that the magnetic plate 130, the bushing 180 and the magnetic sleeve 140 form a stable whole, ensuring the perpendicularity of the axis of the magnetic sleeve 140 to the magnetic plate 130 and the coaxiality of the bushing 180 and the magnetic sleeve 140.

[0076] In this embodiment, the protrusion 113 of the coil frame 110 is interference-fitted with or riveted to the mounting hole 132 of the magnetic plate 130, so that the magnetic plate 130, the bushing 180 and the magnetic sleeve 140 are firmly fixed together relative to the coil frame 110, thereby ensuring that the movement direction of the moving iron core 160 is consistent with the closing or opening direction of the moving contact 221.

[0077] In this embodiment, the protrusions 182 are evenly distributed around the moving iron core 160 on the first end face, so that the magnetic plate 130 can reliably abut against the first end face of the body 181 at various positions along the circumferential direction.

[0078] In this embodiment, by providing a raised rib 183 on the bushing portion 180 and fitting it into the fitting hole 141 of the magnetic sleeve 140, the bushing portion 180 and the magnetic sleeve 140 are connected more tightly. The magnetic sleeve 140 will not shift or rotate relative to the bushing portion 180 due to external factors.

[0079] In this embodiment, each rib 183 is arranged around the moving iron core on the second end face of the body 181, which can improve the bonding strength between the magnetic sleeve 140 and the bushing portion 180.

[0080] In this embodiment, the rounded edges of the opening of the fitting hole 141 can prevent the magnetic sleeve 140 or the rib 183 from producing burrs on the edge of the fitting hole 141, thus making the movement of the moving iron core 160 along the first direction Z smoother.

[0081] Example 2

[0082] See Figure 7 , Figure 7 The direct-acting relay 1 in this embodiment is shown. For example... Figure 7 As shown, the only difference between the direct-acting relay 1 in Embodiment 2 and Embodiment 1 is that the bushing 180, the coil frame 110 and the magnetic sleeve 140 insert are integrally injection molded, that is, the bushing 180 and the coil frame 110 are completely connected as a plastic part.

[0083] In this embodiment, the bushing 180, coil frame 110, and magnetic sleeve 140 insert are integrally injection molded, resulting in fewer assembly steps. This ensures the coaxiality of the guide channel formed by the magnetic sleeve 140 and the shaft hole 114 of the coil frame 110. While ensuring the magnetic efficiency of the magnetic circuit 100, it also keeps the direction of movement of the moving iron core 160 consistent with the direction of movement of the moving contact 220. The contact between the moving contact 220 and the two stationary contacts 240 is more reliable.

[0084] Example 3

[0085] See Figure 8 , Figure 8 The direct-acting relay 1 in Embodiment 3 is shown. In Embodiment 3, the contact portion 200 further includes a positioning component 250. Two stationary contacts 241 abut against and are positioned by the positioning component 250, and the positioning component 250 abuts against and is positioned by the magnetic plate 130. Specifically, the positioning component 250 includes a first positioning member 251 and a second positioning member 252. The first positioning member 251 abuts against the magnetic plate 130 along a first direction Z, and the second positioning member 252 is fixedly connected to the first positioning member 251. The two stationary contacts 241 abut against the second positioning member 252 along the first direction Z.

[0086] The other parts of this embodiment are the same as those in Embodiment 1.

[0087] In this embodiment, the magnetic plate 130's contact surface abuts against the first end face of the bushing portion 180. Since the area of ​​the first end face of the bushing portion 180 is smaller than the area of ​​the end face of the retaining wall 112 of the coil frame 110, it is easier to ensure flatness. Therefore, it is possible to ensure the perpendicularity of the first end face of the bushing portion 180 and the contact surface of the magnetic plate 130 to the guide channel. The positioning component 250 is positioned by the magnetic plate 130 and positions the two stationary contacts 241 by abutting against them. The positioning reference of the two stationary contacts 241 is based on the magnetic plate 130 and the bushing portion 180. Therefore, it is easier to ensure that the two stationary contacts 142 are less likely to deviate relative to the magnetic plate 130 and the guide channel than in the prior art.

[0088] In this embodiment, when the two moving contacts 221 are disconnected from the two stationary contacts 241, the end of the pusher 210 away from the moving contacts 221 abuts against the magnetic guide 150 along the first direction Z. Based on the fact that the two stationary contacts 241 are less likely to deviate relative to the magnetic guide plate 130 and the guide channel, the consistency of the contact gap between the two stationary contacts 241 and the corresponding moving contacts 221 is further improved compared with the prior art.

[0089] The description of the above specification and embodiments is used to explain the scope of protection of this application, but does not constitute a limitation on the scope of protection of this application.

Claims

1. A magnetic circuit component for use in a direct-acting relay (1), characterized in that, include: The coil holder (110) has a shaft hole (114) extending in a first direction (Z); A magnetic guide plate (130) is located at one end of the coil frame (110) along the first direction (Z); A magnetic sleeve (140) is fixed to the coil frame (110) and located inside the shaft hole (114); A moving iron core (160) slides within the shaft hole (114) with the magnetic sleeve (140) in a first direction (Z) to attract or move away from the magnetic plate (130); and A bushing portion (180) is located at least partially between the magnetic plate (130) and the magnetic sleeve (140) along a first direction (Z) and is integrally injection molded with the magnetic sleeve (140) insert. The bushing portion (180) is arranged around the moving iron core (160). The magnetic plate (130) has an attraction surface facing the moving iron core (160) that abuts against the first end face of the bushing portion (180) facing the magnetic plate (130).

2. The magnetic circuit portion as described in claim 1, characterized in that, The bushing (180), the coil frame (110), and the magnetic sleeve (140) insert are integrally injection molded.

3. A magnetic circuit portion as described in claim 1 or 2, characterized in that, The bushing (180) is made of a non-magnetic material and slides in cooperation with the moving iron core (160) along the first direction (Z).

4. A magnetic circuit portion as described in claim 3, characterized in that, The bushing portion (180) is provided with a body (181), which is located between the magnetic plate (130) and the magnetic sleeve (140) along a first direction (Z), and the first end face is formed on the body (181).

5. A magnetic circuit portion as described in claim 4, characterized in that, The bushing portion (180) is also provided with a protrusion (182), which extends from the body (181) toward the first end face of the magnetic plate (130) along a first direction (Z); the magnetic plate (130) is provided with a connecting hole (131) corresponding to the protrusion (182), and the protrusion (182) is inserted into the connecting hole (131).

6. In a magnetic circuit part as described in claim 5, the magnetic guide plate (130) and the bushing part (180) are fixed by riveting the protrusion (182) or the connecting hole (131) is interference-fitted with the protrusion (182).

7. A magnetic circuit portion as described in claim 5, characterized in that, The number of protrusions (182) is at least two, and each protrusion (182) is evenly distributed around the moving iron core (160) on the first end face of the body (181).

8. A magnetic circuit portion as described in claim 4, characterized in that, The bushing portion (180) is also provided with a rib (183), which extends from the second end face of the body (181) away from the magnetic plate (130) along a first direction (Z); the magnetic sleeve (140) is provided with a fitting hole (141) corresponding to the rib (183), and the rib (183) fits into the fitting hole (141) along the first direction (Z).

9. A magnetic circuit portion as described in claim 8, characterized in that, The number of the ribs (183) is at least two, and each rib (183) is evenly distributed around the moving iron core (160) on the second end face of the body (181).

10. A magnetic circuit portion as described in claim 8, characterized in that, The fitting hole (141) has an opening facing the moving iron core (160), and the edges of the opening are rounded.

11. A direct-acting relay, characterized in that, It includes a contact portion (200) and a magnetic circuit portion (100) as described in any one of claims 1 to 10; the contact portion includes a moving contact (221) and a stationary contact (241); the moving iron core (160) drives the moving contact (221) to close or open with the stationary contact (241) along a first direction (Z).

12. A direct-acting relay as described in claim 11, characterized in that, The contact portion includes a pusher (210) and a movable contact (220). The movable contact (220) has two movable contacts (221), and the stationary contacts (241) have two stationary contacts (241) corresponding to the two movable contacts (221). The pusher (210) is fixedly connected to the moving iron core (160) to drive the movable contact (220) along the first direction (Z), so that the two movable contacts (221) and the two stationary contacts (241) close or open along the first direction (Z).

13. A direct-acting relay as described in claim 12, characterized in that, The contact portion further includes a positioning component (250), the two stationary contacts (241) abut against the positioning component (250) along the first direction (Z) and are positioned by the positioning component (250), and the positioning component (250) abuts against the magnetic plate (130) along the first direction (Z) and is positioned by the magnetic plate (130).

14. A direct-acting relay as described in claim 13, characterized in that, The magnetic circuit part (100) also includes a magnetic conductor (150), which is connected to the magnetic plate (130) and the magnetic sleeve (140). When the two moving contacts (221) are disconnected from the two stationary contacts (241), the end of the pusher (210) away from the moving contacts (221) abuts against the magnetic conductor (150) along the first direction (Z).

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