Magnetic circuit part and direct-acting relay

Abstract

The utility model discloses a magnetic circuit part and a direct-acting relay. Wherein the magnetic circuit part is used for a direct-acting relay, and the magnetic circuit part is additionally provided with a lining which is made of a non-magnetic material and is in sliding fit with a movable iron core between a magnetic conductive plate and a magnetic conductive sleeve along the extension direction of a shaft hole of a coil frame. The direct-acting relay comprises the magnetic circuit part. By adopting the technical scheme, compared with the prior art, the resistance value when the relay is closed can be ensured to meet the design requirement.

Description

Technical Field

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

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

[0003] The main drawback of the above technical solution is that, during actual testing and operation, it was found that the resistance value of some relays was higher than the design value after closing. Utility Model Content

[0004] The present application aims to overcome the above-mentioned defects or problems in the background art, and provide a magnetic circuit part and a direct-acting relay, which can ensure that the resistance value of the relay when closed meets the design requirements compared with the prior art.

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

[0006] The first technical solution relates to a magnetic circuit part for a direct-acting relay, 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 in the first direction; a magnetic conducting sleeve fixedly connected with the coil holder and located in the axial hole; a moving iron core slidingly fitted with the magnetic conducting sleeve in the axial hole in the first direction to attract or move away from the magnetic conducting plate; and a bushing made of a non-magnetic conducting material and located in the axial hole, which is located between the magnetic conducting plate and the magnetic conducting sleeve in the first direction and slidingly fitted with the moving iron core in the first direction.

[0007] The second technical solution is based on the first technical solution, wherein the attracting surface of the magnetic conducting plate towards the moving iron core abuts against the first end surface of the bushing towards the magnetic conducting plate.

[0008] The third technical solution is based on the second technical solution, wherein the second end surface of the bushing away from the magnetic conducting plate abuts against the magnetic conducting sleeve.

[0009] The fourth technical solution is based on the second technical solution, wherein the bushing and the magnetic conducting sleeve are insertedly fitted in the first direction.

[0010] The fifth technical solution is based on the fourth technical solution, wherein the bushing and the magnetic conducting sleeve are insertedly fitted with interference, the axial hole and the magnetic conducting sleeve or the bushing are fitted with interference, and the axial hole (114) and the magnetic conducting sleeve (140) or the bushing (180) are fitted with interference.

[0011] The sixth technical solution is based on the fifth technical solution, wherein one of the bushing and the magnetic conducting sleeve is provided with an inserted hole around the moving iron core, and the other is provided with an inserted part around the moving iron core, and the inserted hole and the inserted part are fitted with interference.

[0012] The seventh technical solution is based on any one of the first to sixth technical solutions, wherein the material of the bushing is metal or ceramic or Teflon.

[0013] The eighth technical solution is based on any one of the first to sixth technical solutions, wherein the magnetic conducting sleeve is an oil-free bearing.

[0014] The ninth technical solution is based on any one of the first to sixth technical solutions, wherein the length of the magnetic conducting sleeve in the first direction is greater than the length of the bushing in the first direction.

[0015] The tenth technical solution relates to a direct-acting relay, which comprises a contact part and a magnetic circuit part according to any one of the first to ninth technical solutions; the contact part comprises a moving contact and a stationary contact; the moving iron core drives the moving contact to close or open the stationary contact in the first direction.

[0016] The eleventh technical solution is based on the tenth technical solution, wherein the contact part comprises a pushing piece and a moving contact, the moving contact is provided with two moving contacts, the stationary contact is provided with two stationary contacts corresponding to the two moving contacts, and the pushing piece is fixedly connected with the moving iron core to drive the moving contact in the first direction, so that the two moving contacts and the two stationary contacts are closed or opened in the first direction.

[0017] The twelfth technical solution relates to a direct-acting relay, which comprises a contact part and a magnetic circuit part according to any one of the second to sixth technical solutions; the contact part comprises a pushing piece, a moving contact, two stationary contacts and a positioning assembly; the moving contact is provided with two moving contacts corresponding to the two stationary contacts, the pushing piece is fixedly connected with the moving iron core to drive the moving contact in the first direction, so that the two moving contacts and the two stationary contacts are closed or opened in the first direction; the two stationary contacts abut against and are positioned by the positioning assembly in the first direction, and the positioning assembly abuts against and is positioned by the magnetic conducting plate in the first direction.

[0018] The thirteenth technical solution is based on the twelfth technical solution, wherein the magnetic circuit part further comprises a magnetic conducting piece connected with the magnetic conducting plate and the magnetic conducting sleeve, and when the two moving contacts and the two stationary contacts are opened, the end of the pushing piece away from the moving contact abuts against the magnetic conducting piece in the first direction.

[0019] Compared with the prior art, the above-mentioned solutions have the following beneficial effects:

[0020] The applicant found through continuous experiments, observations and analyses that the reason why the resistance value of the direct-acting relay in the prior art is higher than the design requirement is that the guiding effect of the magnetic conducting sleeve on the moving iron core becomes smaller and smaller as the moving iron core moves upward during the process of the moving iron core moving upward and being attracted by the magnetic conducting plate, so that the moving iron core is prone to deflection during the process of moving upward, and the pushing piece fixedly connected with the moving iron core is also prone to deflection, which causes the contact pressure of the moving contact and the stationary contact on one side to not reach the design requirement, resulting in poor contact or even no contact, and increasing the resistance value or even causing an arc between the moving contact and the stationary contact.

[0021] The applicant further found that the deflection of the moving iron core can also cause the arc on one side to not be extinguished as required during the opening process, causing serious erosion of the single-sided contact, and even causing product damage due to the re-ignition of the arc.

[0022] In the first technical solution, the bushing made of non-magnetic material and in sliding fit with the moving iron core is additionally arranged between the magnetic conducting plate and the magnetic conducting sleeve along the first direction, so that the moving iron core is always guided sufficiently during the process of moving upward along the first direction and being attracted by the magnetic conducting plate. Therefore, compared with the prior art, the moving iron core is less likely to be deflected during the process of moving upward, the contact pressure of the two moving contacts and the corresponding stationary contacts is more balanced, the moving contacts can be more reliably closed with the stationary contacts, and the resistance value of the relay when closed can be more guaranteed to meet the design requirements. During the process of the moving contacts being disconnected with the stationary contacts, the arc is more likely to be extinguished correctly, and the service life of the contacts and the relay is higher than that of the prior art.

[0023] In the second technical solution, the attraction surface of the magnetic conducting plate towards the moving iron core abuts against the first end surface of the bushing towards the magnetic conducting plate, so that compared with the technical solution in which the magnetic conducting plate abuts against the coil holder, it is easier to guarantee that the guiding channel formed by the bushing is perpendicular to the magnetic conducting plate, and the moving iron core is less likely to be deflected during the process of moving upward along the first direction. This is because, when the magnetic conducting plate abuts against the coil holder, the planeness of the end surface of the baffle wall of the coil holder is more difficult to guarantee than that of the end surface of the bushing, so that the magnetic conducting plate is more likely to be deflected relative to the shaft hole.

[0024] In the third technical solution, the second end surface of the bushing away from the magnetic conducting plate abuts against the magnetic sleeve, so that it is easier to guarantee that the guiding channel formed by the bushing and the magnetic sleeve is perpendicular to the magnetic conducting plate, and the moving iron core is less likely to be deflected during the process of moving upward along the first direction.

[0025] In the fourth technical solution, the bushing and the magnetic sleeve are inserted and fitted along the first direction, so that the bushing and the magnetic sleeve form a whole which is fixed relative to each other without the coil holder, it is easier to guarantee that the guiding channel formed by the bushing and the magnetic sleeve is perpendicular to the magnetic conducting plate, and the moving iron core is less likely to be deflected during the process of moving upward along the first direction.

[0026] In the fifth technical solution, the bushing and the magnetic sleeve are inserted and fitted with interference, so that the combination of the bushing and the magnetic sleeve is more compact and less likely to move relative to each other, the guiding channel formed by the bushing and the magnetic sleeve is more likely to be perpendicular to the magnetic conducting plate, and the moving iron core is less likely to be deflected during the process of moving upward along the first direction. The shaft hole is interference-fitted with the magnetic sleeve or the bushing, so that the whole formed by the magnetic sleeve and the bushing can be fixed relative to the coil holder.

[0027] In the sixth technical solution, the bushing and the magnetic sleeve are interference-fitted through the insertion hole and the insertion part surrounding the moving iron core, so that the coaxiality of the guiding channel formed by the bushing and the magnetic sleeve is more easily guaranteed, the guiding effect is better, and the moving iron core is less likely to be deflected during the process of moving upward along the first direction.

[0028] In the seventh technical solution, the material of the bushing is metal or ceramic or Teflon or other non-injection molding material. Compared with the injection molding material, the perpendicularity of the guide channel of the bushing and the end face of the bushing is easier to be ensured, so that the moving iron core is less likely to be deflected during the movement in the first direction.

[0029] In the eighth technical solution, the magnetic conducting sleeve is an oil-free bearing. The outer surface of the oil-free bearing is coated with a material such as Teflon, which is wear-resistant and has a small friction coefficient, so that the magnetic conducting sleeve guides the moving iron core more smoothly.

[0030] In the ninth technical solution, the length of the magnetic conducting sleeve in the first direction is greater than the length of the bushing in the first direction, so that the magnetic conducting area of the moving iron core and the magnetic conducting sleeve is larger, and the magnetic conducting efficiency between the moving iron core and the magnetic conducting sleeve is better ensured.

[0031] The tenth and eleventh technical solutions are the application of the magnetic circuit part defined in the cited technical solutions to the direct-acting relay, so they have corresponding technical effects.

[0032] In the twelfth technical solution, the attracting surface of the magnetic conducting plate abuts against the first end face of the bushing part. Since the area of the first end face of the bushing part is smaller than the area of the end face of the coil holder barrier, the flatness is easier to be ensured, so that the perpendicularity of the first end face of the bushing part and the attracting surface of the magnetic conducting plate to the guide channel is ensured. The positioning assembly is positioned by the magnetic conducting plate, and the two static contacts are positioned by abutting against the two static contacts. The positioning reference of the two static contacts is based on the magnetic conducting plate and the bushing part, so the two static contacts are less likely to be deflected relative to the magnetic conducting plate and the guide channel than in the prior art.

[0033] The thirteenth technical solution further limits the end of the pushing piece away from the moving contact to abut against the magnetic conducting piece when the moving contact is disconnected from the static contact on the basis of the twelfth technical solution. On the basis of the two static contacts being less likely to be deflected relative to the magnetic conducting plate and the guide channel than in the prior art, the thirteenth technical solution further improves the consistency of the contact gap between the two static contacts and the corresponding moving contact relative to the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments, the following briefly introduces the drawings needed to be used:

[0035] Figure 1 It is a structural schematic diagram of a direct-acting relay in the prior art;

[0036] Figure 2 It is a structural schematic diagram of a direct-acting relay in the prior art;

[0037] Figure 3 It is a structural schematic diagram of the magnetic circuit part of the direct-acting relay in the second embodiment;

[0038] Figure 4 A perspective view of the magnetic sleeve in Example 2;

[0039] Figure 5 A perspective view of the bushing in Example 2;

[0040] Figure 6 A structural schematic view of the direct-acting relay in Example 3.

[0041] Explanation of main reference numerals:

[0042] 1. Direct-acting relay; 100. Magnetic circuit part; 110. Coil holder; 111. Shaft body; 112. Retaining wall; 113. Projection; 114. Shaft hole; 120. Coil; 130. Magnetic plate; 140. Magnetic sleeve; 141. Sleeve body; 142. Plug-in part; 150. Magnetic member; 160. Moving iron core; 161. Spring mounting hole; 162. Glue injection groove; 170. First elastic member; 180. Bushing; 181. Sliding fit hole; 182. Plug-in hole; 200. Contact part; 210. Pushing member; 211. Pushing rod; 212. Pushing seat; 220. Moving contact piece; 221. Moving contact point; 230. Second elastic member; 240. Static contact piece; 241. Static contact point; 250. Positioning assembly; 251. First positioning member; 252. Second positioning member; 300. Housing; a. Protruding part; Z. First direction. DETAILED DESCRIPTION

[0043] In the claims and specification, the terms "first", "second", or "third" and the like, subject only to distinguish different objects, unless otherwise defined, are used to describe a particular order.

[0044] 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 for the convenience of simplifying 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.

[0045] 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.

[0046] In the claims and specification, the terms "include", "have" and their variants mean "include but not limited to".

[0047] 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.

[0048] The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings.

[0049] Example 1

[0050] See Figure 2 , Figure 2 The direct-acting relay 1 in Embodiment 1 is shown. For example... Figure 2 As shown, the direct-acting relay 1 includes a magnetic circuit portion 100, a contact portion 200, and a housing 300.

[0051] like Figure 2 As shown, the magnetic circuit part 100 includes a coil frame 110, a coil 120, a magnetic plate 130, a magnetic sleeve 140, a magnetic component 150, a moving iron core 160, a first elastic component 170, and a bushing 180.

[0052] like Figure 2 As shown, the coil frame 110 is made of plastic. The coil frame 110 includes a shaft 111 and two retaining walls 112. The shaft 111 extends along a first direction Z, and the two retaining walls are perpendicular to the first direction Z and located at opposite ends of the shaft 111 along the first direction Z. The retaining wall located upwards along the first direction Z has a protrusion 113 extending upwards along the first direction Z. The coil frame 110 has a central shaft hole 114 that penetrates the shaft 111 and the two retaining walls 112 along the first direction Z. In this embodiment, the cross-section of the shaft hole 114 is circular.

[0053] like Figure 2 As shown, coil 120 is wound on shaft 111 of coil holder 110. The winding axis of coil 120 extends along the first direction Z, which is consistent with the axis of shaft hole 114.

[0054] like Figure 2 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 a mounting hole through which the protrusion 113 passes. The protrusion 113 is interference-fitted with the mounting hole, thereby fixing the magnetic plate 130 relative to the coil frame 120.

[0055] like Figure 2As shown, the material of the magnetic conductive sleeve 140 is magnetic conductive material, and the magnetic conductive sleeve 140 is an oil-free bearing in this embodiment, and the inner surface of the magnetic conductive sleeve 140 is provided with a wear-resistant layer, and 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 conductive sleeve 140 is annular and arranged around the movable iron core 160. The magnetic conductive sleeve 140 is located at the middle and lower part of the shaft hole 114 along the first direction Z and is in interference fit with the shaft hole 114, so that the magnetic conductive sleeve 140 is fixed relative to the coil holder 110. The lower end of the magnetic conductive sleeve 140 extends out of the shaft hole 114.

[0056] As shown in the figure, Figure 2 The material of the magnetic conductive sleeve 140 is magnetic conductive material, and the magnetic conductive sleeve 140 is arranged around the coil holder 110 and is cup-shaped or U-shaped, and is cup-shaped in this embodiment. The cup side wall of the magnetic conductive sleeve 140 is connected with the magnetic conductive plate 130. The cup bottom wall of the magnetic conductive sleeve 140 is connected with the lower end of the magnetic conductive sleeve 140, and in other embodiments, the magnetic conductive sleeve 140 can also be integrally formed with the magnetic conductive sleeve 140.

[0057] As shown in the figure, Figure 2 The movable iron core 160 is in sliding fit with the magnetic conductive sleeve 140 in the shaft hole 114 along the first direction Z to attract or move away from the magnetic conductive plate 130. The center of the movable iron core 160 is provided with a threaded hole in the middle 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 greater than that 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 greater than that of the threaded hole.

[0058] As shown in the figure, Figure 2 The first elastic member 170 extends along the first direction Z, and the upper end of the first elastic member 170 abuts against the magnetic conductive plate 130, and the lower end of the first elastic member 170 is located in the spring mounting hole 161 and abuts against the movable iron core 160. The first elastic member 170 deforms and stores energy in the process of moving upward along the first direction Z until it is attracted to the magnetic conductive plate 130, and releases energy by restoring deformation to push the movable iron core 160 to move downward along the first direction Z away from the magnetic conductive plate 130.

[0059] As shown in the figure, Figure 2 The bushing 180 is made of non-magnetic conductive material, which can be metal or ceramic or Teflon, and is more preferably Teflon. In this embodiment, the bushing 180 is annular, and the bushing 180 is arranged around the movable iron core 160. The bushing 180 is located between the magnetic conductive plate 130 and the magnetic conductive sleeve 140 along the first direction Z and is in sliding fit with the movable iron core 160 along the first direction Z. In this embodiment, the attraction surface of the magnetic conductive plate 130 towards the movable iron core 160 reliably abuts against the first end surface of the bushing 180 towards the magnetic conductive plate 130, and the second end surface of the bushing 180 away from the magnetic conductive plate 130 reliably abuts against the upper end surface of the magnetic conductive sleeve 140. In this embodiment, the length of the bushing 180 along the first direction Z is less than the length of the magnetic conductive sleeve 140 along the first direction Z.

[0060] AsFigure 2 As shown, the contact portion includes a pusher 210, a moving contact 220, a second elastic member 230, and two stationary contacts 240.

[0061] like Figure 2 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 reach its limit position. At this time, the moving iron core 160 is still in sliding engagement with the bushing 180 and the magnetic guide sleeve 140. Similarly, the moving iron core 160 moves upward along the first direction until it is attracted to the contact surface of the magnetic guide plate 130, reaching its limit position. At this time, the moving iron core 160 is still in sliding engagement with the bushing 180 and the magnetic sleeve 140.

[0062] like Figure 2 As shown, the movable contact 220 is located above the push base 212 along the first direction Z. The movable contact 220 is provided with a bridging part and two movable contacts 221. The two movable contacts 221 are arranged upward along the first direction Z. The bridging part bridges the two movable contacts 221 and is made of conductive material.

[0063] like Figure 2 As shown, the second elastic member 230 extends along the first direction Z, with its upper end abutting against the movable contact member 220 and its lower end abutting against the push seat 212. The function of the second elastic member 230 will be described in detail later.

[0064] like Figure 3 to Figure 5 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.

[0065] like Figure 3 to Figure 5 As shown, the housing 300 is used to house the magnetic circuit portion 100 and the contact portion 200. The coil frame 110, coil 120, magnetic plate 130, magnetic sleeve 140, magnetic component 150, bushing 180, and two stationary contacts 240 are all fixed relative to the housing 300. The moving iron core 160, pushing member 210, and moving contact 220 all move relative to the housing 300 along a first direction Z. The first elastic member 170 and the second elastic member 230 both elastically deform relative to the housing 300 along the first direction.

[0066] The direct-acting relay 1 in the embodiment further comprises two coil terminals and two load terminals extending out of the housing 300. The two coil terminals are electrically connected with the coil 120 and externally connected with a signal circuit. The two load terminals are electrically connected with the two static contacts 240 respectively and externally connected with a load circuit.

[0067] 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 guiding channel formed by the magnetic conducting sleeve 140 and the bushing 180 along the first direction Z, and in the process, the first elastic member 170 is compressed and deformed to store 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 moving contact 220 to move upward through the second elastic member 230, until the moving contact point 221 abuts against the corresponding static contact point 241, and the external load circuit is conducted through one of the static contacts 240, the moving contact 220 and the other static contact 240. After the moving contact point 221 abuts against the corresponding static contact point 241, the moving iron core 160 continues to move upward until it is attracted to the magnetic conducting plate 130. In the process, the pusher 210 continues to move upward to form an overstroke, and the second elastic member 230 is compressed and deformed to store energy, so that the moving contact point 221 is more reliably closed with the static contact point 241.

[0068] When the two coil terminals lose voltage and the coil 120 is de-energized, the first elastic member 170 restores deformation and releases energy to drive the moving iron core 160 to move downward along the first direction Z, and also drives the pusher 210 to move downward, until the second elastic member 230 restores deformation to drive the moving contact 220 to move downward, so that the moving contact point 221 moves away from the static contact point 241 along the first direction Z, and the load circuit is disconnected. Until the bottom end of the push rod 211 abuts against the cup bottom wall of the magnetic conducting member 150, the moving iron core 160 stops moving downward, at this time, the moving iron core 160 moves away from the magnetic conducting plate 130 along the first direction Z, and the moving contact point 221 moves away from the static contact point 241 along the first direction Z.

[0069] In the embodiment, the bushing 180 made of non-magnetic material and in sliding fit with the moving iron core 160 is additionally arranged between the magnetic conducting plate 130 and the magnetic conducting sleeve 140 along the first direction Z, so that the moving iron core 160 is always guided sufficiently in the process of moving upward along the first direction Z and being attracted to the magnetic conducting plate 130. Therefore, the moving iron core 160 is less likely to be deflected in the process of moving upward compared with the prior art, the contact pressure of the two moving contact points 221 and the corresponding static contact points 241 is more balanced, the moving contact point 221 can be more reliably closed with the static contact point 241, and the resistance value of the relay 1 when closed can better meet the design requirements compared with the prior art. In the process of the moving contact point 221 being disconnected with the static contact point 241, the arc is more likely to be extinguished correctly, and the service life of the contact and the service life of the relay 1 are higher than those of the prior art.

[0070] In the embodiment, the second end surface of the bushing 180 away from the magnetic conducting plate 130 abuts against the magnetic conducting sleeve 140, so it is easier to ensure that the guide channel formed by the bushing 180 and the magnetic conducting sleeve 140 is perpendicular to the magnetic conducting plate 130, and the moving iron core 160 is less likely to be deflected during movement in the first direction Z.

[0071] In the embodiment, the second end surface of the bushing 180 away from the magnetic conducting plate 130 abuts against the magnetic conducting sleeve 140, so it is easier to ensure that the guide channel formed by the bushing 180 and the magnetic conducting sleeve 140 is perpendicular to the magnetic conducting plate 130, and the moving iron core 160 is less likely to be deflected during movement in the first direction Z.

[0072] In the embodiment, the material of the bushing 180 is metal or ceramic or Teflon or other non-injection molding materials, which is easier to ensure the perpendicularity of the guide channel of the bushing 180 and the end surface of the bushing 180 compared with injection molding materials, so the moving iron core 160 is less likely to be deflected during movement in the first direction Z.

[0073] In the embodiment, the magnetic conducting sleeve 140 is an oil-free bearing, and the outer surface of the bearing is coated with a wear-resistant material with a small friction coefficient, such as Teflon, to make the guide of the magnetic conducting sleeve 140 to the moving iron core 160 smoother.

[0074] In the embodiment, the length of the magnetic conducting sleeve 140 in the first direction Z is greater than the length of the bushing 180 in the first direction, so the magnetic conducting area of the moving iron core 160 and the magnetic conducting sleeve 140 is larger, and the magnetic conducting efficiency between the moving iron core 160 and the magnetic conducting sleeve 140 is better ensured.

[0075] Embodiment Two

[0076] Referring to Figure 3 , Figure 4 The structure and mutual relationship of the magnetic conducting sleeve 140 and the bushing 180 in embodiment two are shown. As shown in Figure 5 In the embodiment, the magnetic conducting sleeve 140 and the bushing 180 are inserted and fitted in the first direction Z. As shown in Figure 6 In the embodiment, the magnetic conducting sleeve 140 is provided with a sleeve body 141 and an insertion part 142, and the insertion part 142 extends upward from the upper end surface of the sleeve body 141 in the first direction Z. The outer diameter of the insertion part 142 is smaller than the outer diameter of the sleeve body 141. As shown in Figure 6As shown, in the embodiment, the bushing 180 is provided with a sliding fit hole 181 and a plug-in hole 182 along the first direction Z, and the sliding fit hole 181 is located above the plug-in hole 182 along the first direction Z. The plug-in hole 182 and the plug-in part 142 are both arranged around the moving iron core 160 and are in interference fit, so that the magnetic conducting sleeve 140 and the bushing 180 are relatively fixed. In the embodiment, the shaft hole 114 is in interference fit with the magnetic conducting sleeve 140 or the bushing 180, so that the magnetic conducting sleeve 140 and the bushing 180 form a whole which is fixed relative to the coil holder 110. The bushing 180 in the embodiment is made of a non-magnetic conducting material, which can be metal or ceramic or Teflon, and is preferably Teflon.

[0077] The other parts of the direct-acting relay 1 in the embodiment are the same as those in the first embodiment. The same parts have the same effects as those in the first embodiment. The direct-acting relay 1 in the embodiment and the first embodiment are mainly different in the following technical effects:

[0078] In the embodiment, the bushing 180 and the magnetic conducting sleeve 140 are in plug-in fit along the first direction Z, so that the bushing 180 and the magnetic conducting sleeve 140 form a whole which is relatively fixed without the coil holder 110, and it is easier to ensure that the guide channel formed by the bushing 180 and the magnetic conducting sleeve 140 is perpendicular to the magnetic conducting plate 130, and the moving iron core 160 is less likely to be deflected during the upward movement along the first direction Z.

[0079] In the embodiment, the bushing 180 and the magnetic conducting sleeve 140 are in interference plug-in fit, so that the combination of the two is more compact and less likely to move relative to each other, and the guide channel formed by the bushing 180 and the magnetic conducting sleeve 140 is more likely to be perpendicular to the magnetic conducting plate 130, and the moving iron core 160 is less likely to be deflected during the upward movement along the first direction Z. The shaft hole is in interference fit with the magnetic conducting sleeve or the bushing, so that the whole formed by the magnetic conducting sleeve and the bushing can be fixed relative to the coil holder.

[0080] In the embodiment, the bushing 180 and the magnetic conducting sleeve 140 are in interference fit through the plug-in hole 182 and the plug-in part 142 around the moving iron core 160, so that the coaxiality of the guide channel formed by the bushing 180 and the magnetic conducting sleeve 140 is more easily ensured, the guiding effect is better, and the moving iron core 160 is less likely to be deflected during the upward movement along the first direction Z.

[0081] Embodiment Three

[0082] See ​ , ​The direct-acting relay 1 in embodiment three is shown. In embodiment three, the contact portion 200 further comprises a positioning assembly 250, the two static contacts 241 respectively abut against and are positioned by the positioning assembly 250, and the positioning assembly 250 abuts against and is positioned by the magnetic conducting plate 130. Specifically, the positioning assembly 250 comprises a first positioning piece 251 and a second positioning piece 252, the first positioning piece 251 abuts against the magnetic conducting plate 130 along the first direction Z, and the second positioning piece 252 is fixedly connected with the first positioning piece 251, and the two static contacts 241 respectively abut against the second positioning piece 252 along the first direction Z.

[0083] The other parts of the embodiment are the same as those in embodiment one.

[0084] In the embodiment, the attracting surface of the magnetic conducting plate 130 abuts against the first end surface of the bushing portion 180, and since the area of the first end surface of the bushing portion 180 is smaller than that of the end surface of the barrier wall 112 of the coil holder 110, the flatness can be better guaranteed, so that the perpendicularity of the first end surface of the bushing portion 180 and the attracting surface of the magnetic conducting plate 130 to the guide channel can be guaranteed, the positioning assembly 250 is positioned by the magnetic conducting plate 130, and the two static contacts 241 are positioned by abutting against the two static contacts 241, so that the positioning reference of the two static contacts 241 is based on the magnetic conducting plate 130 and the bushing portion 180, and thus the two static contacts 241 are less likely to be deflected relative to the magnetic conducting plate 130 and the guide channel than in the prior art.

[0085] In the embodiment, when the two moving contacts 221 are disconnected from the two static contacts 241, the end of the pushing piece 210 away from the moving contact 221 abuts against the magnetic conducting piece 150 along the first direction Z, and on the basis that the two static contacts 241 are less likely to be deflected relative to the magnetic conducting plate 130 and the guide channel, the consistency of the contact gap between the two static contacts 241 and the corresponding moving contacts 221 is further improved compared with the prior art.

[0086] The above description and embodiment are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application.

Claims

1. A magnetic circuit part for a direct-acting relay (1), comprising: a coil holder (110) provided with a shaft hole (114) extending in a first direction (Z); a magnetic conducting plate (130) located at one end of the coil holder (110) in the first direction (Z); a magnetic conducting sleeve (140) fixedly connected with the coil holder (110) and located in the shaft hole (114); a moving iron core (160) slidingly fitted with the magnetic conducting sleeve (140) in the shaft hole (114) in the first direction (Z) to attract or move away from the magnetic conducting plate (130); and a bushing (180) made of a non-magnetic conducting material and located in the shaft hole (114), between the magnetic conducting plate (130) and the magnetic conducting sleeve (140) in the first direction (Z), and slidingly fitted with the moving iron core (160) in the first direction (Z). The attracting surface of the magnetic conducting plate (130) facing the moving iron core (160) abuts against the first end surface of the bushing (180) facing the magnetic conducting plate (130). The second end surface of the bushing (180) facing away from the magnetic conducting plate (130) abuts against the magnetic conducting sleeve (140). The bushing (180) and the magnetic conducting sleeve (140) are insertedly fitted in the first direction (Z). The bushing (180) and the magnetic conducting sleeve (140) are insertedly fitted with interference, and the shaft hole (114) is fitted with interference with the magnetic conducting sleeve (140) or the bushing (180). One of the bushing (180) and the magnetic conducting sleeve (140) is provided with an insertion hole (182) surrounding the moving iron core (160), and the other is provided with an insertion part (142) surrounding the moving iron core (160), and the insertion hole (182) and the insertion part (142) are fitted with interference. The material of the bushing (180) is metal or ceramic or Teflon.

2. A magnetic circuit portion as claimed in claim 1, characterized in that The magnetic conducting sleeve (140) is an oil-free bearing.

3. A magnetic circuit portion as claimed in claim 2, characterized in that The length of the magnetic conducting sleeve (140) in the first direction (Z) is greater than the length of the bushing (180) in the first direction (Z).

4. A magnetic circuit portion as claimed in claim 2, characterized in that It comprises a contact part (200) and a magnetic circuit part (100) as claimed in any one of claims 1 to 9; the contact part comprises a moving contact (221) and a stationary contact (241); the moving iron core (160) drives the moving contact (221) to close or disconnect with the stationary contact (241) in the first direction (Z).

5. A magnetic circuit portion as claimed in claim 4, characterized in that The contact part comprises a pusher (210) and a moving contact piece (220), the moving contact piece (220) is provided with two moving contacts (221), the stationary contact (241) is provided with two stationary contacts (241) corresponding to the two moving contacts (221), and the pusher (210) is fixedly connected with the moving iron core (160) to drive the moving contact piece (220) in the first direction (Z), so that the two moving contacts (221) and the two stationary contacts (241) are closed or disconnected in the first direction (Z).

6. A magnetic circuit portion as claimed in claim 5, characterized in that ​ 7. A magnetic circuit portion according to any one of claims 1 to 6, characterized in that ​ 8. A magnetic circuit portion according to any one of claims 1 to 6, characterized in that ​ 9. A magnetic circuit portion according to any one of claims 1 to 6, characterized in that ​ 10. A direct-acting relay characterized by ​ 11. A direct-acting relay as claimed in claim 10, characterized in that ​ 12. A direct-acting relay characterized by It includes a contact part (200) and a magnetic circuit part (100) as claimed in any one of claims 2 to 6; the contact part includes a pusher (210), a moving contact (220), two static contacts (241) and a positioning assembly (250); the moving contact (220) is provided with two moving contacts (221) corresponding to the two static contacts (241), 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 contacts (221) are closed or disconnected with the two static contacts (241) in the first direction (Z); the two static contacts (241) abut against the positioning assembly (250) in the first direction (Z) and are positioned by the positioning assembly (250), and the positioning assembly (250) abuts against the magnetic conducting plate (130) in the first direction (Z) and is positioned by the magnetic conducting plate (130).

13. A direct-acting relay as claimed in claim 12, characterized in that The magnetic circuit part (100) further includes a magnetic conducting piece (150) connected with the magnetic conducting plate (130) and the magnetic conducting sleeve (140), and when the two moving contacts (221) are disconnected with the two static contacts (241), the end of the pusher (210) away from the moving contact (221) abuts against the magnetic conducting piece (150) in the first direction (Z).

Images