Magnetic conductive assembly, magnetic circuit part and direct-acting relay

Abstract

The utility model discloses a magnetic conductive assembly, a magnetic circuit part and a direct-acting relay. Wherein the magnetic conduction assembly comprises a magnetic conduction sleeve and a magnetic conduction piece which are fixedly connected with each other; the magnetic conductive sleeve is provided with a guide channel extending along the 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 magnetic conducting piece is opened in the first direction, and the magnetic conducting sleeve is fixedly connected to the bottom wall of the magnetic conducting piece. The magnetic circuit part and the direct-acting relay comprise the magnetic conductive assembly. 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 a magnetic conductive component, 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 the present application is to overcome the above-mentioned defects or problems existing in the background art, and to provide a magnetic circuit part and a direct-acting relay, which can ensure that the direct-acting relay is closed under the rated closing voltage compared with the prior art.

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

[0006] The first technical solution relates to a magnetic conducting assembly for a magnetic circuit part of a direct-acting relay, which comprises a magnetic conducting sleeve and a magnetic conducting piece fixed to each other; the magnetic conducting sleeve and the magnetic conducting piece are made of magnetic conducting material, the magnetic conducting sleeve is provided with a guide channel extending in a first direction, the guide channel is used to guide the movement of a moving iron core of the magnetic circuit part in the first direction; the magnetic conducting piece is open in the first direction, and the magnetic conducting sleeve is fixed to the bottom wall of the magnetic conducting piece.

[0007] The second technical solution is based on the first technical solution, wherein the magnetic conducting piece is provided with a connecting protrusion protruding from the bottom wall in the first direction; the connecting protrusion is located in the guide channel and close to the wall of the magnetic conducting sleeve, and the connecting protrusion is welded with the magnetic conducting sleeve.

[0008] The third technical solution is based on the second technical solution, wherein the number of the connecting protrusions is at least three, and each connecting protrusion is uniformly distributed along the circumference of the magnetic conducting sleeve.

[0009] The fourth technical solution is based on the first technical solution, wherein the magnetic conducting sleeve and the magnetic conducting piece are integrally formed.

[0010] The fifth technical solution is based on the first technical solution, wherein the magnetic conducting sleeve and the bottom wall of the magnetic conducting piece are bonded.

[0011] The sixth technical solution is based on the first technical solution, wherein the magnetic conducting piece is provided with a connecting wall, the connecting wall extends from the bottom wall in the first direction and is interference-fitted with the guide channel.

[0012] The seventh technical solution relates to a magnetic circuit part, which comprises: a coil holder provided with an axial hole extending in a first direction; a magnetic conducting plate located at one end of the coil holder along the first direction and fixed relative to the coil holder; a magnetic conducting assembly as described in any one of the first to sixth technical solutions, a side wall of the magnetic conducting piece is connected with the magnetic conducting plate; and a moving iron core located in the axial hole and at least partially located in the guide channel, the moving iron core is slidingly fitted with the magnetic conducting sleeve in the first direction to attract or move away from the magnetic conducting plate.

[0013] The eighth technical solution is based on the seventh technical solution, wherein the coil holder is provided with a retaining wall, and the magnetic conducting 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 holder is provided with a protrusion protruding from the end surface of the baffle in the first direction; and the magnetic conducting plate is provided with an assembly hole, and the protrusion is in interference fit or is fixed by riveting with the assembly hole.

[0015] The tenth technical solution relates to a direct-acting relay, which comprises a contact part and a magnetic circuit part as described in any one of the seventh to ninth technical solutions; the contact part comprises a pusher, a moving contact and two static contact points; the moving contact is provided with two moving contact points corresponding to the two static contact points, and the pusher is fixed with the moving iron core to drive the moving contact in the first direction, so that the two moving contact points are closed or disconnected with the two static contact points in the first direction.

[0016] Compared with the prior art, the above-mentioned solutions have the following beneficial effects:

[0017] The applicant found through continuous experiments, observations and analyses that the reason why the direct-acting relay in the prior art does not achieve closure under the rated closing voltage is that in the prior art, the magnetic conducting sleeve and the coil holder are fixed by interference fit, and the coil holder may shake in the magnetic conducting member, so that the magnetic conducting sleeve and the magnetic conducting member are not in full contact, the magnetic conducting cross section is greatly reduced, the magnetic efficiency of the magnetic circuit part is reduced, and the direct-acting relay does not achieve closure under the rated closing voltage.

[0018] In the first technical solution, the magnetic conducting sleeve and the magnetic conducting member are fixed to form a whole magnetic conducting assembly, which can avoid interference fit between the magnetic conducting sleeve and the coil holder, can ensure that the magnetic conducting sleeve and the magnetic conducting member are in full contact in the first direction, and can ensure the magnetic conducting cross section and the magnetic efficiency, so that the direct-acting relay can achieve closure under the rated closing voltage compared with the prior art.

[0019] In the second technical solution, the connecting protrusions are welded with the magnetic conducting sleeve, which can not only fix the magnetic conducting sleeve and the magnetic conducting member, but also has low cost.

[0020] In the third technical solution, the connecting protrusions are at least three, and are distributed along the circumference of the magnetic conducting sleeve, so that the welding is more firm.

[0021] The fourth to sixth technical solutions are other specific embodiments of the first technical solution.

[0022] In the seventh technical solution, the magnetic conducting plate is fixedly connected with the coil holder to form an integral body, and then is tightly connected with the magnetic conducting assembly. Therefore, the magnetic conducting plate fixedly connected with the coil holder and the magnetic conducting assembly are tightly connected to form an integral body. This not only helps to ensure the magnetic conducting section and the magnetic efficiency, but also helps to ensure that the moving iron core guided by the guide channel of the magnetic conducting sleeve is not easy to be deflected when being attracted to the magnetic conducting plate, and ensures the coaxiality of the guide channel and the shaft hole, so that the moving contact can be relatively moved along the Z-axis direction with the stationary contact, and the closing or opening of the two meets the design requirements. Especially when the connecting protrusions are uniformly distributed in the circumferential direction, the position of the magnetic conducting sleeve can be automatically adjusted, which is more conducive to ensuring the coaxiality of the guide channel and the shaft hole. Therefore, compared with the prior art, the direct-acting relay can be more reliably closed under the rated closing voltage. Further, the attraction jitter under the action of the elastic member can be avoided, and the electrical life of the contact can be better ensured.

[0023] In the eighth and ninth technical solutions, the magnetic conducting plate abuts against the end face of the stop wall, and is fixed relative to the coil holder through the interference fit or the rivet fixing of the protrusion and the assembly hole, which is conducive to ensuring that the magnetic conducting plate is perpendicular to the guide channel, so that the moving iron core is not easy to be deflected relative to the magnetic conducting plate.

[0024] The tenth technical solution has the technical effects of the technical solutions it refers to. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments, the following briefly introduces the drawings needed to be used:

[0026] Figure 1 is a schematic view of a direct-acting relay in the prior art;

[0027] Figure 2 is a top view of the magnetic conducting assembly in embodiment one;

[0028] Figure 3 is a sectional view of A-A of Figure 2

[0029] Figure 4 is a structural schematic view of the direct-acting relay in embodiment one;

[0030] Figure 5 is a structural schematic view of the magnetic conducting assembly in embodiment two;

[0031] Figure 6 is a structural schematic view of the magnetic conducting assembly in embodiment three.

[0032] MAIN REFERENCE NUMERALS EXPLANATION

[0033] ​1. A direct-acting relay; 100, magnetic circuit part; 110, coil holder; 111, shaft body; 112, retaining wall; 113, protrusion; 114, shaft hole; 115, protruding portion; 120, coil; 130, magnetic conducting plate; 140, magnetic conducting sleeve; 141, guide channel; 150, magnetic conducting member; 151, connecting protrusion; 152, connecting wall; 160, moving iron core; 161, spring mounting hole; 162, glue injection groove; 170, first elastic member; 180, magnetic conducting assembly; 200, contact part; 210, pusher; 211, push rod; 212, push seat; 220, moving contact piece; 221, moving contact point; 230, second elastic member; 240, stationary contact piece; 241, stationary contact point; 300, housing; Z, first direction. DETAILED DESCRIPTION

[0034] In the claims and specification, the terms "first", "second", or "third" and the like, subject to be distinguished unless otherwise defined, are used only to distinguish different objects, and are not used to describe a particular order.

[0035] In the claims and specification, the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation and position shown in the drawings, and are only used to facilitate the description, and do not imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation.

[0036] In the claims and specification, the term "fixedly connected" or "fixedly connected" should be understood broadly, that is, any connection between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0037] In the claims and specification, the terms "including", "having" and their variants mean "including but not limited to".

[0038] In the claims and specification, the term "provided with" means that the technical feature located after it is part of the technical feature located before it.

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

[0040] Embodiment one

[0041] Reference Figure 2 and Figure 3 , Figure 2 andFigure 3 The magnetic conducting assembly 180 in the first embodiment is shown. As shown in Figure 2 and Figure 3 , the magnetic conducting assembly 180 comprises the magnetic conducting sleeve 140 and the magnetic conducting piece 150 which are fixed to each other.

[0042] As shown in Figure 2 and Figure 3 , the magnetic conducting sleeve 140 is made of a magnetic conducting material, and an oil-free bearing is adopted in the embodiment. The inner surface of the magnetic conducting sleeve 140 is provided with a wear-resistant layer having a small friction coefficient, and the specific material of the wear-resistant layer is Teflon. The magnetic conducting sleeve 140 is provided with a guide channel 141 extending along the first direction Z.

[0043] As shown in Figure 2 and Figure 3 , the magnetic conducting piece 150 is made of a magnetic conducting material. The magnetic conducting piece 150 is in a cup shape or a U shape as a whole and is open along the first direction Z. The magnetic conducting piece 150 is provided with at least three connecting protrusions 151 which protrude from the bottom wall along the first direction Z and extend towards the opening direction.

[0044] As shown in Figure 2 and Figure 3 , the magnetic conducting sleeve 140 is fixed to the bottom wall of the magnetic conducting piece 150. The connecting protrusions 151 are located in the guide channel 141 and close to the wall of the magnetic conducting sleeve 140, and the connecting protrusions 151 are welded with the magnetic conducting sleeve, so that the magnetic conducting sleeve 140 and the magnetic conducting piece 150 form the integral magnetic conducting assembly 180.

[0045] Referring to Figure 4 , Figure 4 The direct-acting relay 1 in the embodiment is shown. As shown in Figure 4 , the direct-acting relay 1 comprises a magnetic circuit part 100, a contact part 200 and a housing 300.

[0046] As shown in Figure 4 , the magnetic circuit part 100 comprises the above-mentioned magnetic conducting assembly 180, a coil holder 110, a coil 120, a magnetic conducting plate 130, a moving iron core 160 and a first elastic member 170.

[0047] As shown in Figure 2The coil holder 110 is made of plastic. The coil holder 110 is provided with a shaft body 111 and two retaining walls 112. The shaft body 111 extends along the first direction Z, and the two retaining walls are perpendicular to the first direction Z and are located at the two ends of the shaft body 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. The center of the coil holder 110 is provided with a shaft hole 114 extending through the shaft body 111 and the two retaining walls 112 along the first direction Z. In this embodiment, the shaft hole 114 has a circular cross-section. In this embodiment, the magnetically conductive assembly 180 is first fixedly connected in one piece, the magnetically conductive plate 130 is fixedly connected in one piece with the coil holder 110, and the magnetically conductive assembly 180 is then fixedly connected in one piece with the coil holder 110 and the magnetically conductive plate 130, so that the coil holder 110 is sleeved outside the magnetically conductive sleeve 140 and is located between the magnetically conductive sleeve 140 and the magnetically conductive member 150.

[0048] As shown in Figure 4 As shown in Figure 4 The coil 120 is wound on the shaft body 111 of the coil holder 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.

[0049] As shown in Figure 4 The magnetically conductive plate 130 is made of a magnetically conductive material. The magnetically conductive plate 130 is located at the upper end of the coil holder 120 along the first direction Z. The magnetically conductive plate 130 is provided with an assembly hole through which the protrusion 113 passes. The protrusion 113 is in interference fit or is staked with the assembly hole, so that the magnetically conductive plate 130 is fixed relative to the coil holder 120. The magnetically conductive plate 130 abuts the upper end surface of the retaining wall 112 located above along the first direction Z. The outer edge of the magnetically conductive plate 130 is in contact with the side wall of the magnetically conductive member 150.

[0050] As shown in Figure 4 The moving iron core 160 is in sliding fit with the magnetically conductive sleeve 140 along the first direction Z in the shaft hole 114 to attract or move away from the magnetically conductive plate 130. The center of the moving iron core 160 is provided with a threaded hole at the middle along the first direction Z, and the threaded hole is provided with a spring mounting hole 161 above, and the diameter of the spring mounting hole 161 is greater than that of the threaded hole. The threaded hole is provided with a glue injection groove 162 below, and the diameter of the glue injection groove 162 is greater than that of the threaded hole.

[0051] As shown in Figure 4 The first elastic member 170 extends along the first direction Z, the upper end of which abuts against the magnetically conductive plate 130, and the lower end of which is located in the spring mounting hole 161 and abuts against the moving iron core 160. The first elastic member 170 is deformed to store energy in the process of moving the moving iron core 160 upward along the first direction Z until it is attracted to the magnetically conductive plate 130, and releases the energy by restoring the deformation to push the moving iron core 160 to move downward along the first direction Z away from the magnetically conductive plate 130.

[0052] As shown in Figure 4As 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 pushes downward against the bottom wall of the magnetic conductor 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 magnetic conductive assembly 180, coil frame 110, coil 120, magnetic conductive plate 130, 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 the 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 in the guide channel 141 formed by the magnetic guide sleeve 140 in the first direction Z, in the process, the first elastic member 170 is compressed and deformed and stores energy. As the moving iron core 160 moves upward, the pusher 210 fixedly connected with the moving iron core 160 also moves upward, and drives the movable contact 220 to move upward through the second elastic member 230, until the movable contact point 221 abuts against the corresponding stationary contact point 241, and the external load circuit is conducted through one of the stationary contacts 240, the movable contact 220 and the other stationary contact 240. After the movable contact point 221 abuts against the corresponding stationary contact point 241, the moving iron core 160 continues to move upward until it is attracted to the magnetic plate 130. In the process, the pusher 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 movable contact point 221 is more reliably closed with the stationary contact point 241.

[0059] The direct-acting relay 1 in the embodiment, when the two coil terminals lose voltage and the coil 120 is de-energized, the first elastic member 170 recovers deformation and releases energy, drives the moving iron core 160 to move downward in the first direction Z, and drives the pusher 210 to move downward together, until the second elastic member 230 recovers deformation, drives the movable contact 220 to move downward, so that the movable contact point 221 moves away from the stationary contact point 241 in the first direction Z, and the load circuit is disconnected. Until the bottom end of the push rod 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 plate 130 in the first direction Z, and the movable contact point 221 moves away from the stationary contact point 241 in the first direction Z.

[0060] In the embodiment, the magnetic guide sleeve 140 and the magnetic guide 150 are fixedly connected to form a magnetic guide assembly 180 as a whole, which can avoid interference between the magnetic guide sleeve 140 and the coil holder 110, compared with the prior art, it can ensure that the magnetic guide sleeve 140 and the magnetic guide 150 are in full contact in the first direction Z, and the magnetic cross section and the magnetic efficiency can be guaranteed, so compared with the prior art, it can better ensure that the direct-acting relay 1 is closed under the rated closing voltage.

[0061] In the embodiment, the magnetic guide sleeve 140 and the magnetic guide 150 are fixedly connected by welding the connecting protrusions 151, which not only can fixedly connect the magnetic guide sleeve 140 and the magnetic guide 150, but also has low cost.

[0062] In the embodiment, the connecting protrusions 151 are at least three, and each connecting protrusion 151 is distributed along the circumference of the magnetic guide sleeve 140, so that the welding is more firm, and the position of the magnetic guide sleeve 140 can be automatically adjusted, which is more conducive to ensuring the coaxiality of the guide channel 141 and the shaft hole 114.

[0063] In the embodiment, the magnetic conductive plate 130 is fixedly connected with the coil holder 110 as a whole and is tightly connected with the magnetic conductive assembly 180, so that the magnetic conductive plate 130 fixedly connected with the coil holder 110 and the magnetic conductive assembly 180 are tightly connected as a whole, which is beneficial to guarantee the magnetic conductive section and the magnetic efficiency, and is also beneficial to guarantee that the moving iron core 160 guided by the guide channel of the magnetic conductive sleeve 140 is not easy to be deflected when being attracted to the magnetic conductive plate 130, so as to ensure the coaxiality of the guide channel 141 and the shaft hole 114, and ensure that the moving contact can be relatively moved along the Z-axis direction with the static contact, so that the closing or opening of the two meets the design requirement. Therefore, compared with the prior art, the direct-acting type relay 1 can be more guaranteed to be closed under the rated closing voltage. Further, the attraction shaking under the action of the first elastic member 170 can be avoided, and the electrical life of the contact can be better guaranteed.

[0064] In the embodiment, the magnetic conductive plate 130 abuts against the end surface of the retaining wall 112, and is fixed relative to the coil holder 110 through the interference fit or the riveting of the protrusion 113 and the assembly hole, which is beneficial to guarantee that the magnetic conductive plate 130 is perpendicular to the guide channel 141, so that the moving iron core 160 is not easy to be deflected relative to the magnetic conductive plate 130.

[0065] Embodiment Two

[0066] Referring to Figure 5 , Figure 5 The magnetic conductive assembly 180 in the embodiment two is shown. As shown in Figure 5 , in the embodiment, the magnetic conductive sleeve 140 and the magnetic conductive member 150 are integrally formed and connected as a whole. The welding step is not needed, and the assembly is more convenient. The other parts of the embodiment are completely same as those of the embodiment one. Here, no more description is given.

[0067] Embodiment Three

[0068] Referring to Figure 6 , Figure 6 The magnetic conductive assembly 180 in the embodiment three is shown. As shown in Figure 6 , in the embodiment, the magnetic conductive member 150 is further provided with a connecting wall 152 extending from the bottom wall along the first direction Z and interference-fitted with the guide channel 141 of the magnetic conductive sleeve 140. The embodiment is another embodiment of the application. The other parts of the embodiment are completely same as those of the embodiment one. Here, no more description is given.

[0069] The above description and embodiment are used to explain the protection scope of the application, but do not constitute the limitation of the protection scope of the application.

Claims

1. A magnetically permeable assembly for use in a magnetic circuit portion (100) of a direct-acting relay (1), characterized in that It includes the magnetic conducting sleeve (140) and the magnetic conducting piece (150) fixed to each other; the magnetic conducting sleeve (140) and the magnetic conducting piece (150) are made of magnetic conducting material, the magnetic conducting sleeve (140) is provided with a guide channel (141) extending along the first direction (Z), the guide channel (141) is used for providing guidance for the movement of the moving iron core (160) of the magnetic circuit part (100) along the first direction (Z); the magnetic conducting piece (150) is open along the first direction (Z), and the magnetic conducting sleeve (140) is fixed to the bottom wall of the magnetic conducting piece (150).

2. A magnetic conducting assembly as claimed in claim 1, characterized in that The magnetic conducting piece (150) is provided with a connecting protrusion (151) protruding from the bottom wall along the first direction (Z); the connecting protrusion (151) is located in the guide channel (141) and close to the wall of the magnetic conducting sleeve (140), and the connecting protrusion (151) is welded with the magnetic conducting sleeve (140).

3. A magnetic conducting assembly as claimed in claim 2, characterized in that The number of the connecting protrusions (151) is at least three, and each connecting protrusion (151) is uniformly distributed along the circumference of the magnetic conducting sleeve (140).

4. A magnetic conducting assembly as claimed in claim 1, characterized in that The magnetic conducting sleeve (140) and the magnetic conducting piece (150) are integrally formed.

5. A magnetic conducting assembly as claimed in claim 1, characterized in that The magnetic conducting sleeve (140) and the bottom wall of the magnetic conducting piece (150) are bonded.

6. A magnetic conducting assembly as claimed in claim 1, characterized in that The magnetic conducting piece (150) is provided with a connecting wall (152) extending from the bottom wall along the first direction (Z) and interference-fitted with the guide channel (141).

7. A magnetic circuit portion for a direct-acting relay (1), characterized in that it It comprises: A coil holder (110) provided with an axial hole (114) extending along the first direction; 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 assembly (180) as claimed in any one of claims 1 to 6, the side wall of the magnetic conducting piece (150) is connected with the magnetic conducting plate (130); And A moving iron core (160) located in the axial hole (114) and at least partially located in the guide channel (141), the moving iron core (160) is slidingly fitted 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 interference-fitted or staked 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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