Insert injection molding body, magnetic circuit part and direct-acting relay

Abstract

The invention discloses an insert injection molding body, a magnetic circuit part and a direct-acting relay, and the insert injection molding body comprises a flux sleeve and a coil frame which are integrally formed through insert injection molding. The magnetic conductive sleeve is made of a magnetic conductive material and is provided with a guide channel extending along a first direction, and the guide channel is used for guiding the movement of the movable iron core of the magnetic circuit part along the first direction; the coil rack is provided with a shaft hole extending along a first direction; and the flux sleeve is positioned in the shaft hole. The magnetic circuit part and the direct-acting relay comprise the insert injection molding body. By adopting the technical scheme, compared with the prior art, 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 an insert injection molded body, 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. 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 conductive plate 130 upward along the first direction Z, thereby forming a magnetic circuit between the moving iron core 160, the magnetic conductive plate 130, the magnetic conductive member 150 and the magnetic conductive sleeve 140. When the coil 120 is de-energized, the moving iron core 160 is driven by the first elastic member 170 to move downwardly away from the magnetic conductive plate 130 along the first direction Z. The contact portion of the direct-acting relay includes a pushing member, 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 pushing member, and the pushing member drives the moving contact to move along the first direction Z, so that the moving contact is closed or disconnected with the corresponding static contact, thereby turning on or off the load circuit. For the direct-acting magnetic holding relay, its structure is basically the same, except that a permanent magnet is added in 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 the distance 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 this application is to overcome the above-mentioned defects or problems existing in the background technology, and to provide an insert injection molded body, 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 under the rated closing voltage.

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

[0006] The first technical solution relates to an insert-molded body, which is used for the magnetic circuit part of a direct-acting relay, and includes a magnetic sleeve and a coil frame that are insert-molded into one piece; the magnetic sleeve is made of a magnetic material and is provided with a guide channel extending along a first direction, and the guide channel is used to provide guidance for the movement of the moving iron core of the magnetic circuit part along the first direction; the coil frame is provided with an axial hole extending along the first direction; the magnetic sleeve is located in the axial hole.

[0007] The second technical solution is based on the first technical solution, wherein one end of the magnetic conductive sleeve extends out of the axial hole along the first direction.

[0008] The third technical solution is based on the first or second technical solution, wherein the wall of the magnetic conductive sleeve is provided with an embedding hole, and the coil frame is provided with a rib embedded in the embedding hole.

[0009] The fourth technical solution is based on the third technical solution, wherein the mating hole extends along the first direction; the coil frame is also provided with a protrusion, which radially protrudes from the hole wall of the axial hole, the magnetic sleeve engages the end surface of the protrusion along the first direction, and the rib extends from the protrusion along the first direction and is mated with the mating hole.

[0010] The fifth technical solution is based on the fourth technical solution, wherein the number of the embedding holes is at least two, the embedding holes are evenly distributed around the guide channel, and each embedding hole opens to the guide channel in a radial direction.

[0011] The sixth technical solution is based on the first technical solution, wherein the magnetic sleeve is an oil-free bearing.

[0012] The seventh technical solution relates to a magnetic circuit part, which is used for a direct-acting relay, and includes: an insert injection molded body, which is as described in any one of the first to sixth technical solutions; a magnetic conductive plate, which is located at one end of the coil frame along the first direction and is fixed relative to the coil frame; a magnetic conductive part, which is connected to the magnetic conductive plate and the magnetic conductive sleeve; and a moving iron core, which is located in the shaft hole and at least partially located in the guide channel, and the moving iron core and the magnetic conductive sleeve are slidably matched along the first direction to attract or move away from the magnetic conductive plate.

[0013] The eighth technical solution is based on the seventh technical solution, wherein the coil frame is provided with a retaining wall, and the magnetic conductive plate abuts against the end surface of the retaining wall.

[0014] The ninth technical solution is based on the eighth technical solution, wherein the coil frame is provided with a protrusion, and the protrusion protrudes from the end face of the retaining wall along the first direction; the magnetic conductive plate is provided with an assembly hole, and the protrusion is interference fit with the assembly hole or fixed by hot rivets.

[0015] The tenth technical solution is based on the ninth technical solution, which includes a contact part and a magnetic circuit part as described in any one of the seventh to ninth technical solutions; the contact part includes a pushing member, a moving contact member and two static contacts; the moving contact member is provided with two moving contacts corresponding to the two static 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.

[0016] Compared with the prior art, the above solution has the following beneficial effects:

[0017] The applicant has found through continuous experiments, observations and analysis that the reason why some direct-acting relays in the prior art fail to close at the rated closing voltage is that in the prior art, the magnetic sleeve is deflected relative to the shaft hole during the process of interference fit with the pressure shaft hole and the shaft hole, and the coaxiality of the magnetic sleeve and the shaft hole is poor, resulting in the moving iron core guided by the magnetic sleeve having additional resistance due to jamming during the closing stroke, so that it fails to close at the rated closing voltage. At the same time, the guide channel is deflected relative to the shaft hole. 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 jamming. Furthermore, when an elastic member is provided between the pusher and the magnetic plate, the magnetic sleeve and the magnetic plate are not vertically aligned, resulting in the moving iron core and the magnetic plate not being able to fit tightly when they are attracted, and there is an air gap on one side. Under the action of the elastic member, attraction jitter is likely to occur, affecting the electrical life of the contacts. 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 cause an explosion under the effect of the attraction and jitter.

[0018] In the first technical solution, the magnetic sleeve and the coil frame insert are injection molded as one piece, which is easier to avoid the deflection of the magnetic sleeve relative to the shaft hole than the prior art, ensuring the coaxiality of the magnetic channel and the shaft hole. Therefore, compared with the prior art, it can better ensure that the direct-acting relay can be closed at the rated closing voltage.

[0019] In the first technical solution, since the coaxiality of the magnetic channel and the shaft hole is ensured, it can provide a basis for ensuring the perpendicularity of the magnetic plate and the magnetic channel, further avoiding attraction jitter and better ensuring the electrical life of the contacts.

[0020] In the second technical solution, one end of the magnetic sleeve extends out of the axial hole along the first direction. Compared with the solution of adding a static iron core between the magnetic sleeve and the magnetic component, it has lower cost and is more convenient for connecting the magnetic component and for the entire end face of the magnetic sleeve to contact the magnetic component. The magnetic cross-section is larger, no magnetic bottleneck is formed, and the magnetic efficiency is higher.

[0021] In the third and fourth technical solutions, by providing protrusions and ribs and engaging the ribs with the engaging holes of the magnetic sleeve, the coil frame and the magnetic sleeve are more tightly connected, and the magnetic sleeve is not displaced or rotated relative to the coil frame due to external factors.

[0022] In the fifth technical solution, the engaging holes and the corresponding ribs are evenly distributed around the guide channel, which can improve the bonding strength between the magnetic sleeve and the coil frame.

[0023] In the sixth technical solution, the magnetic sleeve is an oil-free bearing, and the outer surface of the oil-free bearing is coated with Teflon or other wear-resistant materials with a low friction coefficient, so that the magnetic sleeve can guide the moving iron core more smoothly.

[0024] The seventh technical solution has the technical effect of the technical solution it refers to.

[0025] In the eighth and ninth technical solutions, the magnetic conductive plate abuts against the end face of the retaining wall, and is fixed relative to the coil frame by interference fit between the protrusion and the assembly hole or by hot riveting, which is beneficial to ensure that the magnetic conductive plate is perpendicular to the guide channel and makes it difficult for the moving iron core to deflect relative to the magnetic conductive plate.

[0026] The tenth technical solution is the application of the magnetic circuit part defined by the technical solution it quotes on a direct-acting relay, and therefore has corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

[0028] Figure 1 It is a schematic diagram of a direct-acting relay in the prior art;

[0029] Figure 2 This is a schematic diagram of the structure of the insert injection molding body in the embodiment;

[0030] Figure 3 A three-dimensional diagram of a magnetic conductive sleeve in an embodiment;

[0031] Figure 4 Schematic diagram of the structure of the direct-acting relay in the embodiment.

[0032] Description of main reference numerals:

[0033] 1. direct-acting relay; 100, magnetic circuit part; 110, coil frame; 111, shaft body; 112, retaining wall; 113, protrusion; 114, shaft hole; 115, protrusion; 116, rib; 120, coil; 130, magnetic plate; 140, magnetic sleeve; 141, guide channel; 142, fitting hole; 150, magnetic member; 160, moving iron core; 161, spring mounting hole; 162, injection groove; 170, first elastic member; 180, insert injection molding body; 200, contact part; 210, push member; 211, push rod; 212, push seat; 220, moving contact member; 221, moving contact point; 230, second elastic member; 240, static contact member; 241, static contact point; 300, housing; Z, first direction. DETAILED DESCRIPTION

[0034] 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.

[0035] 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" and the like 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.

[0036] 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.

[0037] In the claims and the description, unless otherwise defined, the terms "includes", "has" and their variations mean "including but not limited to".

[0038] 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.

[0039] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings.

[0040] See also Figure 2 , Figure 2 FIG. 1 shows an insert molded body 180 in this embodiment. Figure 2As shown, the insert-molded body 180 includes a magnetic conductive sleeve 140 and a coil frame 110 which are insert-molded into one piece.

[0041] See also Figure 3 , Figure 3 The magnetic conductive sleeve 140 is shown. Figure 3 As 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 its inner surface is provided with a wear-resistant layer. 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 provided with a guide channel 141 extending along the first direction. In this embodiment, the wall of the magnetic sleeve 140 is evenly distributed with six interlocking holes 142 in the circumferential direction, and the six interlocking holes 142 are evenly distributed around the guide channel 141. In other embodiments, the number of interlocking holes 142 can also be more than two. The six interlocking holes 142 extend along the first direction Z. Each interlocking hole 142 opens in the guide channel 141, and the edges of the opening are rounded.

[0042] like Figure 2 As shown, the material of the coil frame 110 is plastic. The coil frame 110 is provided with a shaft body 111, two retaining walls 112, two protrusions 113, an axial hole 114, a protrusion 115 and six ribs 116. The shaft body 111 extends along the first direction Z. The two retaining walls are perpendicular to the first direction Z and are respectively located at the two ends of the shaft body 111 along the first direction Z. The two protrusions 113 protrude from the end surface of the retaining wall 112 located above along the first direction along the first direction along the first direction. An axial hole 114 is provided at the center of the coil frame 110. The axial hole 114 passes through the shaft body 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. The protrusion 115 protrudes radially from the hole wall of the axial hole 114 and is located in the middle and upper part of the axial hole 114 along the first direction Z. The protrusion 115 is annular and is provided with a center hole. Six ribs 116 extend downward along the first direction Z from the lower end surface of the protrusion 115. In other embodiments, the number of the ribs 116 may be more than two. The ribs 116 are provided with arc surfaces or rounded transition surfaces facing the guide channel.

[0043] In other embodiments, the fitting holes 142 and the ribs 116 may also be arranged perpendicular to the Z-axis direction as long as they fit into each other.

[0044] After the insert injection molding body 180 is formed, the magnetic sleeve 140 is located in the shaft hole 114, and the upper end surface of the magnetic sleeve 140 engages with the lower end surface of the protrusion 115 along the first direction Z. The six ribs 116 are correspondingly embedded in the embedding holes 142. The lower end of the magnetic sleeve 140 along the first direction Z extends out of the shaft hole 114 along the first direction Z.

[0045] See also Figure 4 , Figure 4 FIG. 1 shows a direct-acting relay 1 in this embodiment. Figure 4 As shown, the direct-acting relay 1 includes a magnetic circuit portion 100 , a contact portion 200 , and a housing 300 .

[0046] like Figure 4 As shown, the magnetic circuit portion 100 includes the above-mentioned insert injection molding body 180 , the coil 120 , the magnetic conductive plate 130 , the magnetic conductive member 150 , the moving iron core 160 and the first elastic member 170 .

[0047] like Figure 4 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 .

[0048] like Figure 4 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 an assembly hole, and the assembly hole is for the protrusion 113 to pass through. The protrusion 113 is interference fit with the assembly hole or fixed by hot riveting, so that the magnetic conductive plate 130 is fixed relative to the coil frame 120. The magnetic conductive plate 130 abuts against the upper end surface of the retaining wall 112 located above along the first direction Z.

[0049] like Figure 4 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. In this embodiment, the magnetic conductive member 150 is cup-shaped. 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.

[0050] like Figure 4 As shown, the moving iron core 160 is in the shaft hole 114 and at least partially located in the guide channel 141 and the center hole. The moving iron core 160 slides with the magnetic sleeve 140 and the protrusion 115 along the first direction Z to attract or move away from the magnetic plate 130. In this embodiment, the rib 116 does not contact the moving iron core 160. A threaded hole is provided in the middle of 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, and 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, and the diameter of the glue injection groove 162 is larger than the diameter of the threaded hole.

[0051] like Figure 4 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.

[0052] like Figure 4 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 .

[0053] like Figure 4 As shown, the pushing member 210 includes a pushing rod 211 and a pushing seat 212. The pushing seat 212 is fixed to the top end of the stacking moving rod 211 along the first direction Z. The pushing rod 211 extends along the first direction Z and is fixed to the moving iron core 160. Specifically, the threads of the pushing rod 211 and the moving iron core 160 are also screwed. After the pushing rod 211 is screwed to the moving iron core 160, the pushing 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 pushing 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.

[0054] like Figure 4 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.

[0055] like Figure 4 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.

[0056] like Figure 4 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 .

[0057] like Figure 4 As shown, the housing 300 is used to accommodate the magnetic circuit part 100 and the contact part 200. The insert injection molding body 180, the coil 120, the magnetic conductive plate 130, the magnetic conductive member 150, and the two static contacts 240 are all fixed relative to the housing 300. The moving iron core 160, the pusher 210, and the moving contact 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.

[0058] 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.

[0059] 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 141 formed by the magnetic sleeve 140 and the central hole of the protrusion 115. 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.

[0060] In the direct-acting relay 1 of this embodiment, when the two coil terminals lose voltage and the coil 120 is powered off, the first elastic member 170 recovers its deformation and releases energy, driving the moving iron core 160 to move downward along the first direction Z, and driving the push member 210 to move downward together, until the second elastic member 230 recovers its deformation, driving the moving contact 220 to move downward, so that the moving contact 221 moves away from the static contact 241 along the first direction Z, and the load circuit is disconnected. Until the bottom end of the push rod 211 hits the bottom wall of the cup of the magnetic member 150, the moving iron core 160 stops moving downward, at which time, the moving iron core 160 moves away from the magnetic plate 130 along the first direction Z, and the moving contact 221 moves away from the static contact 241 along the first direction Z.

[0061] In the present embodiment, the magnetic sleeve 140 and the coil frame 110 are integrally formed by insert injection molding, which can more easily avoid the magnetic sleeve 140 from being skewed relative to the shaft hole 114 compared with the prior art, thereby ensuring the coaxiality of the magnetic channel and the shaft hole 114. Therefore, compared with the prior art, it can better ensure that the direct-acting relay 1 is closed at the rated closing voltage.

[0062] In this embodiment, since the coaxiality of the magnetic channel and the shaft hole is ensured, it can provide a basis for ensuring the perpendicularity of the magnetic plate 130 and the magnetic channel, further avoiding attraction jitter and better ensuring the electrical life of the contacts.

[0063] In the present embodiment, one end of the magnetic sleeve 140 extends out of the axial hole 114 along the first direction Z. Compared with the solution of adding a static iron core between the magnetic sleeve 140 and the magnetic component 150, the solution has lower cost and is more convenient for connecting the magnetic component 150. It is also convenient for the entire end face of the magnetic sleeve 140 to contact with the magnetic component 150. The magnetic cross-section is larger, no magnetic bottleneck is formed, and the magnetic efficiency is higher.

[0064] In this embodiment, by providing the protrusion 115 and the rib 116 and making the rib 116 fit into the fitting hole 142 of the magnetic sleeve 140, the coil frame 110 and the magnetic sleeve 140 are more tightly connected, and the magnetic sleeve 140 is prevented from being displaced or rotated relative to the coil frame 110 due to external factors.

[0065] In this embodiment, the engaging holes 142 and the corresponding ribs 116 are evenly distributed around the guide channel 141 , which can improve the bonding strength between the magnetic conductive sleeve 140 and the coil frame 110 .

[0066] In this embodiment, the center hole and the guide channel 141 are used together to provide guidance for the movement of the moving iron core 160 along the first direction Z, which can increase the guiding distance of the insert injection body 180 to the moving iron core 160, making it less likely for the moving iron core 160 to deflect relative to the shaft hole 114. In other embodiments, the center hole gives way to the moving iron core 160, which can avoid interference with the moving iron core 160.

[0067] In this embodiment, the magnetic sleeve 140 is an oil-free bearing, and the outer surface of the oil-free bearing is coated with a wear-resistant material with a small friction coefficient such as Teflon, so that the magnetic sleeve 140 can guide the moving iron core 160 more smoothly.

[0068] In this embodiment, the magnetic conductive plate 130 abuts against the end surface of the retaining wall 112, and is fixed relative to the coil frame 110 by interference fit between the protrusion 113 and the assembly hole or by riveting, which helps to ensure that the magnetic conductive plate 130 is perpendicular to the guide channel 141, making it difficult for the moving iron core 160 to deviate relative to the magnetic conductive plate 130.

[0069] 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. An insert injection molding body, which is used for the magnetic circuit part (100) of a direct-acting relay (1), characterized in that: The invention comprises a magnetic sleeve (140) and a coil frame (110) which are integrally formed by insert injection molding; the magnetic sleeve (140) is made of a magnetic material and is provided with a guide channel (141) extending along a first direction (Z); the guide channel (141) is used to provide guidance for the movement of a moving iron core (160) of the magnetic circuit part (100) along the first direction (Z); the coil frame (110) is provided with an axial hole (114) extending along the first direction (Z); the magnetic sleeve (140) is located in the axial hole (114).

2. An insert injection molded body as claimed in claim 1, characterized in that: One end of the magnetic conductive sleeve (140) extends out of the shaft hole (114) along a first direction (Z).

3. An insert injection molded body as claimed in claim 1 or 2, characterized in that: The wall of the magnetic conductive sleeve (140) is provided with an embedding hole (142), and the coil frame (110) is provided with a rib (116) embedded in the embedding hole (142).

4. An insert injection molded body as claimed in claim 3, characterized in that: The mating hole (142) extends along a first direction (Z); the coil frame (110) is also provided with a protrusion (115), the protrusion (115) radially protrudes from the hole wall of the axial hole (114), the magnetic sleeve (140) engages with the end surface of the protrusion (115) along the first direction (Z), and the rib (116) extends from the protrusion (115) along the first direction (Z) and is mated with the mating hole (142).

5. An insert injection molded body as claimed in claim 4, characterized in that: The number of the embedding holes (142) is at least two, and the embedding holes (142) are evenly distributed around the guide channel. Each embedding hole (142) opens radially into the guide channel (141), and the edge of the opening is rounded. The rib (116) is provided with an arc surface or a rounded transition surface toward the guide channel.

6. An insert injection molded body as claimed in claim 1, characterized in that: The magnetic conductive sleeve (140) is an oil-free bearing.

7. A magnetic circuit part, which is used for a direct-acting relay (1), characterized in that include: An insert-molded body (180) as claimed in any one of claims 1 to 6; A magnetic conductive plate (130) located at one end of the coil frame (110) along the first direction (Z) and fixed relative to the coil frame (110); A magnetic conductive member (150) connected to the magnetic conductive plate (130) and the magnetic conductive sleeve (140); and A moving iron core (160) is located in the shaft hole (114) and at least partially located in the guide channel (141); the moving iron core (160) and the magnetic conductive sleeve (140) are slidably matched along a first direction (Z) to attract or move away from the magnetic conductive plate (130).

8. A magnetic circuit portion as claimed in claim 7, characterized in that: The coil frame (110) is provided with a retaining wall (112), and the magnetic conductive plate (130) abuts against the end surface of the retaining wall (112).

9. A magnetic circuit portion as claimed in claim 8, characterized in that: The coil frame (110) is provided with a protrusion (113), and the protrusion (113) protrudes from the end surface of the retaining wall (112) along a first direction (Z); the magnetic conductive plate (130) is provided with an assembly hole, and the protrusion (113) is interference-fitted with the assembly hole or fixed by hot riveting.

10. 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 7 to 9; the contact portion comprises a pushing member (210), a moving contact member (220) and two stationary contacts (241); the moving contact member (220) is provided with two moving contacts (221) corresponding to the two stationary contacts (241), and the pushing member (220) 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 disconnected along the first direction (Z).

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