Magnetic circuit part and direct-acting relay

Abstract

The invention 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] The present application relates to the field of relays, and in particular to a magnetic circuit part and a direct-acting relay. Background Art

[0002] See also Figure 1 , Figure 1 FIG. 1 shows a magnetic circuit portion 100 and a contact portion of a direct-acting relay in the prior art. Figure 1 As shown, in the prior art, the magnetic circuit part 100 of the direct-acting relay includes a coil frame 110, a coil 120, a magnetic conductive plate 130, a magnetic conductive sleeve 140, a magnetic conductive member 150, a moving iron core 160 and a first elastic member 170. The coil frame 110 is provided with an axial hole extending along the 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 conductive 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 conductive sleeve 140 is located in the axial hole and fixedly connected to the coil frame 110. Specifically, a radially protruding protrusion a is provided in the middle of the axial hole along the first direction Z, and the lower surface of the protrusion a along the first direction Z forms a stop surface. The magnetic conductive sleeve 140 is inserted into the axial hole from bottom to top along the first direction Z and is interference fit with the axial hole. After being inserted into place, the upper end of the magnetic sleeve 140 along the first direction Z abuts against the stop surface formed by the protrusion a, and the lower end of the magnetic sleeve 140 along the first direction Z extends out of the shaft hole. The magnetic conductive member 150 is arranged around the coil frame 110 and connects the magnetic conductive plate 130 and the magnetic conductive sleeve 140. The magnetic conductive member 150 can be cup-shaped or U-shaped, and can be integrally formed with the magnetic conductive sleeve 140 or separated from the magnetic conductive sleeve 140. The moving iron core 160 slides with the magnetic conductive sleeve 140 in the shaft hole along the first direction Z to attract or move away from the magnetic conductive plate 130. The first elastic member 170 is placed between the magnetic conductive 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 magnetic force formed causes the moving iron core 160 to attract the magnetic plate 130 upward along the first direction Z, thereby forming a magnetic circuit between the moving iron core 160, the magnetic plate 130, the magnetic member 150 and the magnetic sleeve 140. When the coil 120 is de-energized, the moving iron core 160 is driven by the first elastic member 170 to move downward away from the magnetic plate 130 along the first direction Z. The contact part of the direct-acting relay includes a pusher, a moving contact and two static contacts. The moving contact is provided with two moving contacts corresponding to the two static 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, so that the moving contact and the corresponding static contact are closed or disconnected, thereby turning on or off the load circuit. For a direct-acting magnetic latching relay, its 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 kept in the attracted position or away 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 at the rated closing voltage. Summary of the invention

[0004] The purpose of the present application is to overcome the above-mentioned defects or problems existing in the background technology and to provide a magnetic circuit part and a direct-acting relay, which, compared with the prior art, can better ensure that the direct-acting relay is closed at the rated closing voltage.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] The first technical scheme relates to a magnetic circuit part, which is used for a direct-acting relay, comprising: a coil frame, which is provided with an axial hole extending along a first direction; a magnetic conductive plate, which is located at one end of the coil frame along the first direction; a magnetic conductive sleeve, which is fixed to the coil frame and located in the axial hole; a moving iron core, which slides with the magnetic conductive sleeve in the axial hole along the first direction to attract or move away from the magnetic conductive plate; and a bushing portion, which is at least partially located between the magnetic conductive plate and the magnetic conductive sleeve along the first direction and is integrally injection-molded with the magnetic conductive sleeve insert, the bushing portion is arranged around the moving iron core, and the attraction surface of the magnetic conductive plate toward the moving iron core abuts against the first end surface of the bushing portion toward the magnetic conductive plate.

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

[0008] The third technical solution is based on the first or second technical solution, wherein the bushing portion is made of a non-magnetic material and is slidably matched with the moving iron core along a 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 conductive plate and the magnetic conductive sleeve along the first direction, and the first end surface 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 boss, and the boss extends along a first direction from the main body toward the first end surface of the magnetic conductive plate; the magnetic conductive plate is provided with a connecting hole corresponding to the boss, and the boss is plugged into and matched with the connecting hole.

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

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

[0013] The eighth technical solution is based on the fourth technical solution, wherein the bushing portion is further provided with a convex rib, and the convex rib extends along the first direction from the second end surface of the main body away from the magnetic conductive plate; the magnetic conductive sleeve is provided with an interlocking hole corresponding to the convex rib, and the convex rib is interlocked with the interlocking hole along the first direction.

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

[0015] The tenth technical solution is based on the eighth technical solution, wherein the fitting hole is provided with an opening toward 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 part and a magnetic circuit part as described in any one of the first to tenth technical solutions; the contact part includes a moving contact and a static contact; the moving iron core drives the moving contact to close or open with the static contact along a first direction.

[0017] The twelfth technical solution is based on the eleventh technical solution, wherein the contact part includes a pushing member and a moving contact member, the moving contact member is provided with two moving contacts, and the static contact is provided with two static contacts corresponding to the two moving contacts, and the pushing member is fixedly connected to the moving iron core to drive the moving contact member along a first direction so that the two moving contacts and the two static contacts are closed or disconnected along the first direction.

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

[0019] The fourteenth technical solution is based on the thirteenth technical solution, wherein the magnetic circuit part also includes a magnetic conductive part, which is connected to the magnetic conductive plate and the magnetic conductive sleeve, and when the two moving contacts are disconnected from the two static contacts, the end of the pushing member away from the moving contact abuts against the magnetic conductive part along the first direction.

[0020] Compared with the prior art, the above solution has the following beneficial effects:

[0021] The applicant has found through continuous experiments, observations and analysis that the reason for the low life of some direct-acting relay contacts in the prior art is that the moving iron core is prone to deflect relative to the magnetic plate when it moves upward along the first direction until it is attracted to the magnetic plate. This deflection causes the moving iron core guided by the magnetic sleeve to have additional resistance during the closing stroke due to jamming, so that it fails to close at the rated closing voltage. When the magnetic sleeve is an oil-free bearing, the moving iron core may also scrape the Teflon layer on the inner surface of the oil-free bearing, causing the Teflon layer on the inner surface to fall off, further aggravating the jam. Furthermore, when an elastic member is arranged between the pusher and the magnetic plate, the magnetic sleeve and the magnetic plate are not vertically aligned, so that the moving iron core and the magnetic plate cannot be tightly attached when they are attracted, and there is an air gap on one side. Under the action of the first elastic member, it is easy to cause attraction jitter, which affects the electrical life of the contact. The deflection of the moving iron core may also cause the contact gaps between the two moving contacts and the corresponding static contacts to be inconsistent, and even explosions may occur under the action of attraction jitter.

[0022] Compared with the prior art, the first technical solution adds a bushing part. Since the bushing part arranged around the moving iron core is integrally formed with the magnetic sleeve insert by injection molding, and the suction surface of the magnetic plate abuts the first end surface of the bushing part, the area of ​​the first end surface of the bushing part is smaller than the area of ​​the end surface of the retaining wall of the coil frame, it is easier to ensure the flatness, so the verticality of the first end surface of the bushing part and the suction surface of the magnetic plate and the guide channel formed by the magnetic sleeve can be ensured. Therefore, compared with the prior art, it can better ensure that the direct-acting relay is closed at the rated closing voltage.

[0023] At the same time, the first technical solution ensures the verticality of the guide channel formed by the magnetic conductive plate and the magnetic conductive sleeve; therefore, it can further avoid the attraction jitter and better ensure the electrical life of the contacts.

[0024] In the second technical solution, the bushing part, the coil frame and the magnetic sleeve insert are integrally molded by injection molding, which is a preferred implementation of the first technical solution. It has fewer assembly steps and can ensure the coaxiality of the guide channel formed by the magnetic sleeve and the axial hole of the coil frame, while ensuring the magnetic efficiency of the magnetic circuit part, making the moving direction of the moving iron core consistent with the closing direction of the moving contact. The contact between the moving contact and the two static contacts is more reliable.

[0025] In the third technical solution, the bushing is made of a non-magnetic material and slides with the moving iron core along the first direction, so that the moving iron core is always fully guided in the process of moving upward along the first direction and engaging with the magnetic plate. Therefore, the moving iron core is less likely to deflect in the process of upward movement than in the prior art, the contact pressure of the two moving contacts and the corresponding static contacts is more balanced, and the moving contact can be closed with the static contact more reliably. Compared with the prior art, it can better ensure that the resistance value of the direct-acting relay meets the design requirements when it is closed. In the process of disconnecting the moving contact from the static contact, the arc is easier to extinguish correctly, and the life of the contact and the life of the direct-acting relay are higher than in the prior art.

[0026] In the fifth technical solution, the magnetic conductive plate is fixed relative to the bushing portion by plugging and fitting the protruding column into the connecting hole of the magnetic conductive plate, thereby preventing the vertical relationship between the magnetic conductive plate and the guide channel from being changed due to external factors.

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

[0028] In the seventh technical solution, the protrusions are evenly distributed around the moving iron core on the first end surface, so that the magnetic conductive plate can reliably abut against the first end surface of the body at each position along the circumferential direction.

[0029] In the eighth technical solution, the bushing is provided with convex ribs which are engaged with the engaging holes of the magnetic sleeve, so that the bushing and the magnetic sleeve are more tightly connected. The magnetic sleeve will not be displaced or rotated relative to the bushing due to external factors.

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

[0031] In the tenth technical solution, the opening edge of the engaging hole is rounded, which can prevent the magnetic sleeve or the convex rib from generating burrs on the edge of the engaging hole, so that the moving iron core moves more smoothly along the first direction.

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

[0033] In the thirteenth technical solution, the attraction surface of the magnetic plate abuts against the first end surface of the bushing portion. Since the area of ​​the first end surface of the bushing portion is smaller than the area of ​​the end surface of the retaining wall of the coil frame, it is easier to ensure flatness. Therefore, the verticality of the first end surface of the bushing portion and the attraction surface of the magnetic plate and the guide channel can be ensured. The positioning assembly is positioned by the magnetic plate, and the two static contacts are positioned by abutting against the two static contacts, so that the positioning reference of the two static contacts is based on the magnetic plate and the bushing portion. Therefore, it can be ensured that the two static contacts are less likely to deflect relative to the magnetic plate and the guide channel than in the prior art.

[0034] The fourteenth technical scheme is based on the thirteenth technical scheme, and further limits the end of the pushing member away from the moving contact to abut the magnetic conductive member when the moving contact and the static contact are disconnected. On the basis that the two static contacts are less likely to deflect relative to the magnetic conductive plate and the guide channel than the prior art, the consistency of the contact gap between the two static contacts and the corresponding moving contacts is further improved compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

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

[0037] Figure 2 It is a structural schematic diagram of the direct-acting relay in the first embodiment;

[0038] Figure 3 is a three-dimensional diagram of the magnetic conductive plate in the first embodiment;

[0039] Figure 4 is a three-dimensional diagram of the magnetic conductive sleeve in the first embodiment;

[0040] Figure 5 is a schematic structural diagram of the bushing portion in the first embodiment;

[0041] Figure 6 It is a schematic diagram of the structure of the insert injection molding body in Example 1;

[0042] Figure 7 It is a structural schematic diagram of the direct-acting relay in the second embodiment;

[0043] Figure 8 This is a schematic diagram of the structure 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 body; 112, retaining wall; 113, protrusion; 114, shaft hole; 120, coil; 130, magnetic plate; 131, connecting hole; 132, mounting hole; 140, magnetic sleeve; 141, fitting hole; 150, magnetic member; 160, moving iron core; 161, spring mounting hole; 162, glue injection groove; 170, first elastic member; 180, bushing part; 1 81. main body; 182. boss; 183. rib; 190. insert injection molding; 200. contact portion; 210. push member; 211. push rod; 212. push seat; 220. moving contact member; 221. moving contact point; 230. second elastic member; 240. stationary contact member; 241. stationary contact point; 250. positioning assembly; 251. first positioning member; 252. second positioning member; 300. shell; a. protrusion; Z. first direction. DETAILED DESCRIPTION

[0046] In the claims and the description, unless otherwise defined, the terms "first", "second" or "third", etc. are intended to distinguish different objects rather than to describe a specific order.

[0047] In the claims and the specification, unless otherwise defined, terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc. indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings and are only for the convenience of simplifying the description and do not imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction.

[0048] In the claims and the specification, unless otherwise defined, the term "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method in which there is no displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0049] In the claims and the description, unless otherwise defined, the terms "includes", "has" and their variations mean "including but not limited to".

[0050] In the claims and the specification, unless otherwise defined, the term "provided with" means that the technical feature located thereafter is a part of the technical feature located therefor.

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

[0052] Embodiment 1

[0053] See also Figure 2 , Figure 2 FIG. 1 shows a direct-acting relay 1 in the first embodiment. 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 conductive plate 130, a magnetic conductive sleeve 140, a magnetic conductive member 150, a moving iron core 160, a first elastic member 170 and a bushing portion 180, wherein the magnetic conductive sleeve 140 and the bushing portion 180 are insert-molded as a whole to form an insert-molded body 190.

[0055] like Figure 2 As shown, the material of the coil frame 110 is plastic. The coil frame 110 is provided with a shaft 111 and two retaining walls 112. The shaft 111 extends along the first direction Z, and the two retaining walls are perpendicular to the first direction Z and are respectively located at both ends of the shaft 111 along the first direction Z. The retaining wall located in the upper direction along the first direction Z is provided with a protrusion 113 extending upward along the first direction Z. An axial hole 114 is provided at the center of the coil frame 110, and the axial hole 114 passes through the shaft 111 and the two retaining walls 112 along the first direction Z. In this embodiment, the cross section of the axial hole 114 is circular.

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

[0057] See also Figure 3 , Figure 3 FIG. 1 shows the magnetic conductive plate 130 in this embodiment. Figure 2 and Figure 3 As shown, the material of the magnetic conductive plate 130 is a magnetic conductive material. The magnetic conductive plate 130 is located at the upper end of the coil frame 120 along the first direction Z. The magnetic conductive plate 130 is provided with four connecting holes 131 and two mounting holes 132, and the mounting holes 132 are for the protrusions 113 to pass through. The protrusions 113 and the mounting holes 132 are interference fit or fixed by hot riveting.

[0058] See also Figure 4 , Figure 4 FIG. 1 shows the magnetic conductive sleeve 140 in this embodiment. Figure 2 and Figure 4As shown, the material of the magnetic sleeve 140 is a magnetic material. In this embodiment, the magnetic sleeve 140 is an oil-free bearing, and a wear-resistant layer is provided on its inner surface. The friction coefficient of the wear-resistant layer is small, and the specific material of the wear-resistant layer is Teflon. In this embodiment, the magnetic sleeve 140 is annular and is arranged around the moving iron core 160. The magnetic sleeve 140 is located in the middle and lower 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, the hole wall of the magnetic sleeve 140 is evenly distributed with six embedded holes 141 along the circumferential direction, and the six embedded holes 141 extend along the first direction Z. In other embodiments, the number of embedded holes 141 can also be other numbers more than two. Each embedded hole 141 is provided with an opening facing the moving iron core 160, and the edge of the opening is rounded. In other embodiments, the embedded hole 141 can also be located in 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 material of the magnetic conductive member 150 is a magnetic conductive material, and the magnetic conductive member 150 is arranged around the coil frame 110 and is cup-shaped or U-shaped, and is cup-shaped in this embodiment. The cup side wall of the magnetic conductive member 150 is connected to the magnetic conductive plate 130. The cup bottom wall of the magnetic conductive member 150 is connected to the lower end of the magnetic conductive sleeve 140.

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

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

[0062] See also Figure 5 and Figure 6 , Figure 5 and Figure 6 FIG. 1 shows an insert-molded body 190 formed by insert-molding the bushing 180 and the magnetic conductive sleeve 140 in this embodiment. Figure 5As shown, the bushing part 180 in this embodiment is made of plastic. The bushing part 180 is provided with a body 181, four convex columns 182 and six convex ribs 183. Of course, the number of the convex columns 182 and the number of the convex ribs 183 can also be other numbers more than two. 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 is disposed around the moving iron core 160. In this embodiment, the body 181 and the moving iron core 160 slide together along the first direction Z. In other embodiments, the body 181 may not slide together with the moving iron core 160. Figure 2 and Figure 5 As shown, the first end surface of the body 181 facing the magnetic conductive plate 130 abuts against the suction surface of the magnetic conductive plate 130 facing the moving iron core 160. Four protrusions 182 extend from the first end surface along the first direction Z and are evenly distributed around the moving iron core 160 on the first end surface. The four protrusions 182 are respectively plugged into and matched with the corresponding connecting holes 131. Specifically, the magnetic conductive plate 130 can be fixed to the bushing 180 by hot riveting the protrusions 182 or the protrusions 182 can be interference-fitted with the connecting holes 131, so that the magnetic conductive plate 130 and the bushing 180 are firmly connected together. Figure 5 and Figure 6 As shown, six convex ribs 183 extend from the second end face of the body 181 away from the magnetic plate 130 along the first direction Z and are evenly distributed around the moving iron core 160 on the second end face. The six convex ribs 183 are respectively engaged with the six interlocking holes 141. In this embodiment, the bushing portion 180 and the magnetic sleeve 140 are formed together as an insert injection molded body 190 by insert injection molding. The magnetic plate 130 is tightly fixed to the insert injection molded body 190 through the interference fit between the connecting hole 131 and the protruding column 182. Then, the insert injection molded body 190 is interference fit with the shaft hole 114, so that the insert injection molded body 190 and the magnetic plate 130 are fixed relative to the coil frame 110.

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

[0064] like Figure 2As shown, the push member 210 includes a push rod 211 and a push seat 212. The push seat 212 is fixed to the top of the stack moving rod 211 along the first direction Z. The push rod 211 extends along the first direction Z and is fixed to the moving iron core 160. Specifically, the threads of the push rod 211 and the moving iron core 160 are also screwed. After the push rod 211 is screwed to the moving iron core 160, the push rod 211 and the moving iron core 160 are reliably kept relatively fixed by injecting glue into the glue injection groove 162. In this embodiment, when the bottom end of the push rod 211 pushes downward against the bottom wall of the cup of the magnetic conductive member 150, the downward movement of the moving iron core 160 along the first direction Z reaches the limit position. At this time, the moving iron core 160 is still in sliding cooperation with the bushing part 180 and the magnetic conductive sleeve 140. Similarly, the moving iron core 160 moves upward along the first direction until it reaches the limit position when it is attracted to the attraction surface of the magnetic conductive plate 130. At this time, the moving iron core 160 is still in sliding cooperation with the bushing portion 180 and the magnetic conductive sleeve 140 .

[0065] like Figure 2 As shown, the movable contact 220 is located above the push seat 212 along the first direction Z. The movable contact 220 is provided with a bridging portion and two movable contacts 221, the two movable contacts 221 are arranged upward along the first direction Z, and the bridging portion 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, the two stationary contacts 240 are arranged perpendicular to the first direction Z and are respectively provided with stationary contacts 241 . The stationary contacts 241 are arranged downward along the first direction Z and are opposite to the corresponding moving contacts 221 .

[0068] like Figure 2 As shown, the housing 300 is used to accommodate the magnetic circuit part 100 and the contact part 200. The coil frame 110, the coil 120, the magnetic conductive plate 130, the magnetic conductive sleeve 140, the magnetic conductive member 150, the bushing part 180, and the two static contact members 240 are all fixed relative to the housing 300. The moving iron core 160, the pusher 210, and the moving contact member 220 all move relative to the housing 300 along the first direction Z. The first elastic member 170 and the second elastic member 230 are both elastically deformed relative to the housing 300 along the first direction.

[0069] The direct-acting relay 1 in this embodiment further 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 are externally connected to the signal circuit. The two load terminals are electrically connected to the two stationary contacts 240 and are externally connected to the load circuit.

[0070] In the direct-acting relay 1 of this embodiment, 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 to move upward along the first direction Z in the guide channel formed by the magnetic sleeve 140 and the bushing 180. During this process, the first elastic member 170 is compressed and deformed and stores 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 to move upward through the second elastic member 230 until the moving contact 221 contacts the corresponding static contact 241, and the external load circuit is turned on through one of the static contacts 240, the moving contact 220 and the other static contact 240. After the moving contact 221 contacts the corresponding static contact 241, the moving iron core 160 continues to move upward until it is attracted to the magnetic plate 130. During this process, the push member 210 continues to move upward to form an overtravel, and the second elastic member 230 is compressed and deformed and stores energy, so that the moving contact 221 is more reliably closed with the static contact 241.

[0071] Compared with the prior art, the present embodiment adds a bushing 180. Since the bushing 180 disposed around the moving iron core 160 and the magnetic sleeve 140 are molded by insert injection molding, and the suction surface of the magnetic plate 130 abuts against the first end surface of the bushing 180, it is not only possible to ensure the verticality of the guide channel formed by the first end surface of the bushing 180 and the suction surface of the magnetic plate 130 and the magnetic sleeve 140, but also because the area of ​​the first end surface of the bushing 180 is smaller than the area of ​​the end surface of the retaining wall 112 of the coil frame 110, it is easier to ensure the flatness. Therefore, compared with the prior art, it is more possible to ensure that the direct-acting relay 1 is closed at the rated closing voltage.

[0072] In this embodiment, since the verticality of the guide channel formed by the magnetic conductive plate 130 and the magnetic conductive sleeve 140 is ensured, the attraction jitter can be further avoided, and the electrical life of the contacts can be better guaranteed.

[0073] In this embodiment, the bushing portion 180 is made of a non-magnetic material and slides with the moving iron core 160 along the first direction Z, so that the moving iron core 160 is always fully guided in the process of moving upward along the first direction Z and engaging with the magnetic plate 130. Therefore, the moving iron core 160 is less likely to deflect during the upward movement than in the prior art, and the contact pressure between the two moving contacts 221 and the corresponding static contacts 241 is more balanced. The moving contact 221 can be closed with the static contact 241 more reliably, and compared with the prior art, it can better ensure that the resistance value of the direct-acting relay 1 meets the design requirements when it is closed. In the process of disconnecting the moving contact 221 from the static contact 241, the arc is more likely to be extinguished correctly, and the life of the contact and the life of the direct-acting relay 1 are higher than in the prior art.

[0074] In this embodiment, the protruding column 182 is plugged into the connecting hole 131 of the magnetic conductive plate 130 to fix the magnetic conductive plate 130 relative to the bushing 180, thereby preventing the vertical relationship between the magnetic conductive plate 130 and the guide channel from being changed due to external factors.

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

[0076] In this embodiment, the protrusion 113 of the coil frame 110 is interference fit with the mounting hole 132 of the magnetic plate 130 or fixed by hot riveting, so that the whole formed by the magnetic plate 130, the bushing portion 180 and the magnetic sleeve 140 is firmly fixed 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 protruding columns 182 are evenly distributed around the moving iron core 160 on the first end surface, so that the magnetic conductive plate 130 can reliably abut against the first end surface of the body 181 at each position along the circumferential direction.

[0078] In this embodiment, the bushing 180 is provided with a rib 183 which engages with the engaging hole 141 of the magnetic sleeve 140, so that the bushing 180 and the magnetic sleeve 140 are more tightly connected. The magnetic sleeve 140 will not be displaced or rotated relative to the bushing 180 due to external factors.

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

[0080] In this embodiment, the opening edge of the fitting hole 141 is rounded to prevent the magnetic sleeve 140 or the rib 183 from generating burrs on the edge of the fitting hole 141 , so that the moving iron core 160 moves along the first direction Z more smoothly.

[0081] Embodiment 2

[0082] See also Figure 7 , Figure 7 FIG. 1 shows a direct-acting relay 1 in this embodiment. Figure 7 As shown, the only difference between the direct-acting relay 1 in the second embodiment and the first embodiment is that the bushing 180, the coil frame 110 and the magnetic conductive sleeve 140 are integrally formed by insert injection molding, that is, the bushing 180 and the coil frame 110 are completely connected as a plastic part.

[0083] In this embodiment, the bushing 180, the coil frame 110 and the magnetic sleeve 140 are integrally formed by insert injection molding, which has fewer assembly steps and can ensure the coaxiality of the guide channel formed by the magnetic sleeve 140 and the axial hole 114 of the coil frame 110, while ensuring the magnetic efficiency of the magnetic circuit part 100, making the movement direction of the moving iron core 160 consistent with the movement direction of the moving contact 220. The contact between the moving contact 220 and the two stationary contacts 240 is more reliable.

[0084] Embodiment 3

[0085] See also Figure 8 , Figure 8 The direct-acting relay 1 in the third embodiment is shown. In the third embodiment, the contact part 200 further includes a positioning assembly 250, the two static contacts 241 respectively abut against the positioning assembly 250 and are positioned by the positioning assembly 250, and the positioning assembly 250 abuts against the magnetic conductive plate 130 and is positioned by the magnetic conductive plate 130. Specifically, the positioning assembly 250 includes a first positioning member 251 and a second positioning member 252, the first positioning member 251 abuts against the magnetic conductive plate 130 along the first direction Z, the second positioning member 252 is fixedly connected to the first positioning member 251, and the two static contacts 241 respectively abut against the second positioning member 252 along the first direction Z.

[0086] The other parts of this embodiment are the same as those of the first embodiment.

[0087] In the present embodiment, the attraction surface of the magnetic conductive plate 130 abuts against the first end surface of the bushing portion 180. Since the area of ​​the first end surface of the bushing portion 180 is smaller than the area of ​​the end surface of the retaining wall 112 of the coil frame 110, it is easier to ensure flatness. Therefore, the verticality of the first end surface of the bushing portion 180 and the attraction surface of the magnetic conductive plate 130 and the guide channel can be ensured. The positioning assembly 250 is positioned by the magnetic conductive plate 130 and abuts against the two static contacts 241 to position the two static contacts 241, so that the positioning reference of the two static contacts 241 is based on the magnetic conductive plate 130 and the bushing portion 180. Therefore, it can be ensured that the two static contacts 142 are less likely to deviate relative to the magnetic conductive plate 130 and the guide channel than the prior art.

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

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

Claims

1. A magnetic circuit part, which is used for a direct-acting relay (1), characterized in that: include: A coil frame (110) having an axial hole (114) extending along a first direction (Z); A magnetic conductive plate (130) located at one end of the coil frame (110) along a first direction (Z); A magnetic conductive sleeve (140) fixedly connected to the coil frame (110) and located in the shaft hole (114); A moving iron core (160) which slides in cooperation with the magnetic conductive sleeve (140) in the shaft hole (114) along a first direction (Z) to attract or move away from the magnetic conductive plate (130); and A bushing portion (180) is at least partially located between the magnetic conductive plate (130) and the magnetic conductive sleeve (140) along a first direction (Z) and is integrally formed with the magnetic conductive sleeve (140) by insert injection molding. The bushing portion (180) is arranged around the moving iron core (160), and the attraction surface of the magnetic conductive plate (130) facing the moving iron core (160) abuts against the first end surface of the bushing portion (180) facing the magnetic conductive plate (130).

2. A magnetic circuit portion as claimed in claim 1, characterized in that: The bushing portion (180), the coil frame (110) and the magnetic conductive sleeve (140) are integrally formed by insert injection molding.

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

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

5. A magnetic circuit portion as claimed in claim 4, characterized in that: The bushing portion (180) is also provided with a boss (182), and the boss (182) extends from the main body (181) along the first direction (Z) toward the first end surface of the magnetic conductive plate (130); the magnetic conductive plate (130) is provided with a connecting hole (131) corresponding to the boss (182), and the boss (182) is plug-fitted with the connecting hole (131).

6. A magnetic circuit portion as described in claim 5, wherein the magnetic conductive plate (130) and the bushing portion (180) are fixed by riveting the boss (182) or the connecting hole (131) and the boss (182) are interference fit.

7. A magnetic circuit portion as claimed in claim 5, characterized in that: The number of the protruding columns (182) is at least two, and the protruding columns (182) are evenly distributed around the moving iron core (160) on the first end surface of the body (181).

8. A magnetic circuit portion as claimed in claim 4, characterized in that: The bushing portion (180) is also provided with a convex rib (183), and the convex rib (183) extends from the second end surface of the main body (181) away from the magnetic conductive plate (130) along a first direction (Z); the magnetic conductive sleeve (140) is provided with an embedding hole (141) corresponding to the convex rib (183), and the convex rib (183) is embedded with the embedding hole (141) along the first direction (Z).

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

10. A magnetic circuit portion as claimed in claim 8, characterized in that: The fitting hole (141) is provided with an opening facing the moving iron core (160), and the edge of the opening is rounded.

11. A direct-acting relay, characterized in that: It comprises a contact portion (200) and a magnetic circuit portion (100) as described in any one of claims 1 to 10; the contact portion comprises 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 claimed in claim 11, characterized in that: The contact part comprises a pushing member (210) and a moving contact member (220); the moving contact member (220) is provided with two moving contacts (221); the stationary contact (241) is provided with two stationary contacts (241) corresponding to the two moving contacts (221); the pushing member (210) is fixedly connected to the moving iron core (160) to drive the moving contact member (220) along a first direction (Z) so that the two moving contacts (221) and the two stationary contacts (241) are closed or opened along the first direction (Z).

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

14. A direct-acting relay as claimed in claim 13, characterized in that: The magnetic circuit portion (100) further comprises a magnetic conductive member (150), wherein the magnetic conductive member (150) is connected to the magnetic conductive plate (130) and the magnetic conductive sleeve (140), and when the two moving contacts (221) are disconnected from the two static contacts (241), one end of the pushing member (210) away from the moving contact (221) abuts against the magnetic conductive member (150) along a first direction (Z).

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