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

Abstract

The utility model 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] This application relates to the field of relays, specifically to an insert injection molded body, a magnetic circuit part, 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. 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 upward along the first direction Z, thereby forming a magnetic circuit between the moving iron core 160, the magnetic plate 130, the magnetic component 150, and the magnetic sleeve 140. When coil 120 is de-energized, the moving iron core 160 is driven downward along the first direction Z by the first elastic element 170, moving away from the magnetic plate 130. The contact part 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 direct-acting magnetic latching relays, the structure is basically the same, except that a permanent magnet is added to the middle of coil 120 along the first direction Z, so that the moving iron core 160 is held in the attracted position or the 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 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 an insert injection molded body, a magnetic circuit part, and a direct-acting relay, which, 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 an insert injection molded body for the magnetic circuit portion of a direct-acting relay, comprising an insert-molded magnetic sleeve and a coil frame; the magnetic sleeve is made of a magnetically conductive material and has a guide channel extending along a first direction, the guide channel being used to guide the movement of the moving iron core of the magnetic circuit portion along the first direction; the coil frame has a shaft hole extending along the first direction; the magnetic sleeve is located within the shaft hole.

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

[0008] The third technical solution is based on the first or second technical solution, wherein the wall of the magnetic sleeve is provided with a fitting hole, and the coil frame is provided with ribs that fit into the fitting hole.

[0009] The fourth technical solution is based on the third technical solution, wherein the fitting hole extends along the first direction; the coil frame is further provided with a protrusion, the protrusion protruding radially from the hole wall of the shaft hole, the magnetic sleeve engages with the end face of the protrusion along the first direction, and the rib extends from the protrusion along the first direction and fits into the fitting hole.

[0010] The fifth technical solution is based on the fourth technical solution, wherein the number of the fitting holes is at least two, each fitting hole is evenly distributed around the guide channel, and each fitting hole opens radially into the guide channel.

[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 component for a direct-acting relay, comprising: an insert injection molded body as described in any one of the first to sixth technical solutions; a magnetic guide plate located at one end of the coil frame along a first direction and fixed relative to the coil frame; a magnetic guide element connected to the magnetic guide plate and the magnetic guide sleeve; and a moving iron core located within the shaft hole and at least partially within the guide channel, the moving iron core slidingly engaging with the magnetic guide sleeve along the first direction to attract or move away from the magnetic guide plate.

[0013] The eighth technical solution is based on the seventh technical solution, wherein the coil is supported by a retaining wall, and the magnetic plate abuts against the end face 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, the protrusion protruding from the end face of the retaining wall along a first direction; the magnetic plate is provided with an assembly hole, and the protrusion is interference-fitted with the assembly hole or fixed by hot riveting.

[0015] The tenth technical solution is based on the ninth technical solution, and includes a contact part and a magnetic circuit part as described in any of the seventh to ninth technical solutions; the contact part includes a pusher, a moving contact and two stationary contacts; the moving contact is provided with two moving contacts corresponding to the two stationary contacts, and the pusher is fixed to the moving iron core to drive the moving contact along a first direction, so that the two moving contacts and the two stationary contacts are closed or opened along the first direction.

[0016] Compared with existing technologies, the above solution has the following beneficial effects:

[0017] Through continuous experimentation, observation, and analysis, the applicant discovered that the reason why some direct-acting relays in the prior art fail to close under the rated closing voltage is that, in the prior art, the magnetic sleeve is misaligned relative to the shaft hole during the interference fit process. The poor coaxiality between the magnetic sleeve and the shaft hole causes additional resistance to the moving iron core guided by the magnetic sleeve during the closing stroke, resulting in failure to close under the rated closing voltage. Simultaneously, the misalignment of the guide channel relative to the shaft hole, when the magnetic sleeve is an oil-free bearing, may cause the moving iron core to scrape against the Teflon layer on the inner surface of the oil-free bearing, causing the Teflon layer to peel 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 attraction, resulting in an air gap on one side. Under the action of the elastic element, this can easily cause vibration during attraction, affecting the electrical life of the contacts. The misalignment of the moving iron core may also cause the contact gap between the two moving contacts and the corresponding stationary contacts to be inconsistent, which may even lead to an explosion under the action of the pull-in vibration.

[0018] In the first technical solution, the magnetic sleeve and the coil frame insert are injection molded as a single unit. Compared with the existing technology, it is easier to avoid the magnetic sleeve from being misaligned relative to the shaft hole, and ensures the coaxiality of the magnetic channel and the shaft hole. Therefore, compared with the existing technology, it can better guarantee that the direct-acting relay can close under the rated closing voltage.

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

[0020] In the second technical solution, one end of the magnetic sleeve extends out of the shaft hole along the first direction. Compared with the solution of adding a static iron core between the magnetic sleeve and the magnetic component, the cost is lower, the connection of the magnetic component is easier, and the entire end face of the magnetic sleeve can contact the magnetic component. The magnetic cross section is larger, and no magnetic bottleneck is formed, resulting in higher magnetic efficiency.

[0021] In the third and fourth technical solutions, by setting protrusions and ribs, and making the ribs fit into the fitting holes of the magnetic sleeve, the coil frame and the magnetic sleeve are connected more tightly, and the magnetic sleeve will not be displaced or rotated relative to the coil frame due to external factors.

[0022] In the fifth technical solution, each fitting hole and corresponding rib 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. The outer surface of the oil-free bearing is coated with wear-resistant materials such as Teflon with a low coefficient of friction, which makes the magnetic sleeve guide the moving iron core more smoothly.

[0024] The seventh technical solution has the technical effects of the technical solution it references.

[0025] In the eighth and ninth technical solutions, the magnetic 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. This helps to ensure that the magnetic plate is perpendicular to the guide channel, making it less likely for the moving iron core to deviate relative to the magnetic plate.

[0026] The tenth technical solution is the application of the magnetic circuit portion defined by the technical solution it references in a direct-acting relay, and therefore has the corresponding technical effect. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments, the accompanying drawings used are briefly described below:

[0028] Figure 1 This 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 molded body in the embodiment;

[0030] Figure 3 This is a perspective view of the magnetic sleeve in the embodiment;

[0031] Figure 4 This is a schematic diagram of the direct-acting relay in the embodiment.

[0032] Explanation of key figure labels:

[0033] 1. Direct-acting relay; 100. Magnetic circuit part; 110. Coil frame; 111. Shaft; 112. Barrier; 113. Protrusion; 114. Shaft hole; 115. Protrusion; 116. Rib; 120. Coil; 130. Magnetic guide plate; 140. Magnetic guide sleeve; 141. Guide channel; 142. Fitting hole; 150. Magnetic guide component; 160. Moving iron core; 161. Spring mounting hole; 162. Glue injection groove; 170. First elastic element; 180. Insert injection molded body; 200. Contact part; 210. Pushing element; 211. Push rod; 212. Push seat; 220. Moving contact; 221. Moving contact; 230. Second elastic element; 240. Stationary contact; 241. Stationary contact; 300. Housing; Z, First direction. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Unless otherwise specified, the terms “comprising,” “having,” and variations thereof in the claims and description shall mean “including but not limited to.”

[0038] 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.

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

[0040] See Figure 2 , Figure 2 The insert injection molded body 180 in this embodiment is shown. For example... Figure 2As shown, the insert injection molded body 180 includes a magnetic sleeve 140 and a coil frame 110 that are integrally injection molded into each other.

[0041] See Figure 3 , Figure 3 The magnetic sleeve 140 is shown. (As shown...) Figure 3 As 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 has a guide channel 141 extending along a first direction. In this embodiment, six fitting holes 142 are evenly distributed along the circumferential direction on the wall of the magnetic sleeve 140, and the six fitting holes 142 are evenly distributed around the guide channel 141. In other embodiments, the number of fitting holes 142 may be two or more. The six fitting holes 142 extend along the first direction Z. Each fitting hole 142 opens into the guide channel 141, and the edge of the opening is rounded.

[0042] like Figure 2 As shown, the coil frame 110 is made of plastic. The coil frame 110 includes a shaft 111, two retaining walls 112, two protrusions 113, a shaft hole 114, a protrusion 115, and six ribs 116. The shaft 111 extends along a first direction Z. The two retaining walls are perpendicular to the first direction Z and are located at opposite ends of the shaft 111 along the first direction Z. The two protrusions 113 protrude along the first direction Z from the end faces of the upper retaining walls 112. The shaft hole 114 is located at the center of the coil frame 110, penetrating 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. The protrusions 115 protrude radially from the wall of the shaft hole 114 and are located in the upper-middle part of the shaft hole 114 along the first direction Z. The protrusion 115 is annular and has a central hole. The six ribs 116 extend downward from the lower end faces of the protrusions 115 along the first direction Z. In other embodiments, the number of ribs 116 may be two or more. Ribs 116 have an arc surface or a rounded transition surface facing the guide channel.

[0043] In other embodiments, the fitting hole 142 and the rib 116 can also be arranged perpendicular to the Z-axis direction, as long as they fit together.

[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 face of the magnetic sleeve 140 engages with the lower end face of the protrusion 115 along the first direction Z. The six ribs 116 are correspondingly fitted into the fitting 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 Figure 4 , Figure 4 The direct-acting relay 1 in this embodiment is shown. For example... 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 aforementioned insert injection molded body 180, coil 120, magnetic guide plate 130, magnetic guide component 150, moving iron core 160, and first elastic component 170.

[0047] like Figure 4 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.

[0048] like Figure 4 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 mounting holes through which the protrusion 113 passes. The protrusion 113 is interference-fitted with the mounting holes or riveted to fix the magnetic plate 130 relative to the coil frame 120. The magnetic plate 130 abuts against the upper surface of the upper retaining wall 112 along the first direction Z.

[0049] like Figure 4 As shown, the magnetic guide 150 is made of a magnetically conductive material. The magnetic guide 150 is arranged around the coil frame 110 and is cup-shaped or U-shaped; in this embodiment, the magnetic guide 150 is cup-shaped. The cup-shaped sidewall of the magnetic guide 150 is in contact with the magnetic guide plate 130. The cup-shaped bottom wall of the magnetic guide 150 is connected to the lower end of the magnetic guide sleeve 140.

[0050] like Figure 4 As shown, the moving iron core 160 is located within the shaft hole 114 and at least partially within the guide channel 141 and the central hole. The moving iron core 160 slides in cooperation 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. The center of the moving iron core 160 has a threaded hole at its center along 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.

[0051] like Figure 4 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.

[0052] like Figure 4 As shown, the contact portion includes a pusher 210, a moving contact 220, a second elastic member 230, and two stationary contacts 240.

[0053] like Figure 4 As 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 its limit position.

[0054] like Figure 4 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.

[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, 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.

[0057] like Figure 4 As shown, the housing 300 is used to house the magnetic circuit portion 100 and the contact portion 200. The insert injection molded body 180, coil 120, magnetic plate 130, magnetic conductor 150, 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 the 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.

[0058] 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.

[0059] 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 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, 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.

[0060] In this embodiment, when the two coil terminals lose voltage and the coil 120 is de-energized, the first elastic element 170 recovers its deformation and releases energy, driving the moving iron core 160 to move downward along the first direction Z, and also driving the pusher 210 to move downward together, until the second elastic element 230 recovers its deformation, driving the moving contact 220 to move downward, so that the moving contact 221 moves away from the stationary contact 241 along the first direction Z, and the load circuit is disconnected. Until the bottom end of the pusher 211 abuts against the bottom wall of the magnetic guide 150, the moving iron core 160 stops moving downward. At this time, the moving iron core 160 moves away from the magnetic guide plate 130 along the first direction Z, and the moving contact 221 moves away from the stationary contact 241 along the first direction Z.

[0061] In this embodiment, the magnetic sleeve 140 and the coil frame 110 insert are integrally injection molded, which makes it easier to avoid the magnetic sleeve 140 from being misaligned relative to the shaft hole 114 compared to the prior art, and ensures the coaxiality of the magnetic channel and the shaft hole 114. Therefore, compared to the prior art, it can better ensure that the direct-acting relay 1 can close under the rated closing voltage.

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

[0063] In this embodiment, one end of the magnetic sleeve 140 extends out of the shaft hole 114 along the first direction Z. Compared with the scheme of adding a static iron core between the magnetic sleeve 140 and the magnetic component 150, the cost is lower, it is easier to connect the magnetic component 150, and it is also easier for the entire end face of the magnetic sleeve 140 to contact the magnetic component 150. The magnetic cross section is larger, and no magnetic bottleneck is formed, resulting in higher magnetic efficiency.

[0064] In this embodiment, by providing a protrusion 115 and a rib 116, and by fitting the rib 116 into the fitting hole 142 of the magnetic sleeve 140, the coil frame 110 and the magnetic sleeve 140 are connected more tightly, and the magnetic sleeve 140 is not displaced or rotated relative to the coil frame 110 due to external factors.

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

[0066] In this embodiment, the central hole and the guide channel 141 work together to guide the movement of the moving iron core 160 along the first direction Z, which increases the guiding distance of the insert injection molding body 180 to the moving iron core 160, making the moving iron core 160 less prone to deflection relative to the shaft hole 114. In other embodiments, the central hole makes way for 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. The outer surface of the oil-free bearing is coated with a wear-resistant material such as Teflon with a low coefficient of friction, which makes the magnetic sleeve 140 guide the moving iron core 160 more smoothly.

[0068] In this embodiment, the magnetic plate 130 abuts against the end face of the retaining wall 112, and the magnetic plate 130 is fixed relative to the coil frame 110 by the interference fit or hot riveting of the protrusion 113 and the assembly hole. This helps to ensure that the magnetic plate 130 is perpendicular to the guide channel 141, so that the moving iron core 160 is not easily deviated relative to the magnetic plate 130.

[0069] 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. An insert-molded body for a magnetic circuit portion (100) of a direct-acting relay (1), characterized by, The magnetic conducting sleeve (140) and the coil holder (110) are integrally formed by insert injection molding; the magnetic conducting sleeve (140) is made of magnetic conducting material and is provided with a guide channel (141) extending along the first direction (Z), the guide channel (141) is used for guiding the movement of the moving iron core (160) of the magnetic circuit part (100) along the first direction (Z); the coil holder (110) is provided with a shaft hole (114) extending along the first direction (Z); the magnetic conducting sleeve (140) is located in the shaft hole (114).

2. An insert-molded body according to claim 1, wherein One end of the magnetic conducting sleeve (140) extends out of the shaft hole (114) along the first direction (Z).

3. An insert-molded body according to claim 1 or 2, wherein The wall of the magnetic conducting sleeve (140) is provided with an embedded hole (142), and the coil holder (110) is provided with a rib (116) embedded with the embedded hole (142).

4. An insert-molded body as defined in claim 3, wherein The embedded hole (142) extends along the first direction (Z); the coil holder (110) is further provided with a protruding portion (115) radially protruding from the hole wall of the shaft hole (114), the magnetic conducting sleeve (140) engages the end face of the protruding portion (115) along the first direction (Z), and the rib (116) extends from the protruding portion (115) along the first direction (Z) and is embedded with the embedded hole (142).

5. An insert-molded body as defined in claim 4, wherein The number of the embedded holes (142) is at least two, each embedded hole (142) is uniformly distributed around the guide channel, and each embedded hole (142) is radially opened to the guide channel (141), the edge of the opening is chamfered, and the rib (116) is provided with a circular arc surface or a chamfered transition surface facing the guide channel.

6. An insert-molded body as defined in claim 1, wherein The magnetic conducting sleeve (140) is an oil-free bearing.

7. A magnetic circuit portion for a direct-acting relay (1), characterized in that it It comprises: An insert injection molded body (180) as claimed in any one of claims 1 to 6; A magnetic conducting plate (130) located at one end of the coil holder (110) along the first direction (Z) and fixed relative to the coil holder (110); A magnetic conducting member (150) connected with the magnetic conducting plate (130) and the magnetic conducting sleeve (140); And A moving iron core (160) located in the shaft hole (114) and at least partially located in the guide channel (141), the moving iron core (160) is in sliding fit with the magnetic conducting sleeve (140) along the first direction (Z) to attract or move away from the magnetic conducting plate (130).

8. A magnetic circuit portion as claimed in claim 7, characterized in that The coil holder (110) is provided with a stop wall (112), and the magnetic conducting plate (130) abuts against the end face of the stop wall (112).

9. A magnetic circuit portion as claimed in claim 8, characterized in that The coil holder (110) is provided with a protrusion (113) protruding from the end face of the stop wall (112) along the first direction (Z); the magnetic conducting plate (130) is provided with a fitting hole, and the protrusion (113) is in interference fit or is staked fixed with the fitting hole.

10. A direct-acting relay characterized by It comprises a contact part (200) and a magnetic circuit part (100) as claimed in any one of claims 7 to 9; the contact part comprises a pusher (210), a moving contact (220) and two static contact points (241); the moving contact (220) is provided with two moving contact points (221) corresponding to the two static contact points (241), and the pusher (210) is fixedly connected with the moving iron core (160) to drive the moving contact (220) in the first direction (Z) so that the two moving contact points (221) and the two static contact points (241) are closed or disconnected in the first direction (Z).

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