Magnetic circuit part and direct-acting relay

Abstract

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

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

[0003] The main defect of the above technical solution is that during actual testing and operation, it is found that the resistance value of some relays after closing is higher than the design value. Summary of the invention

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

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

[0006] The first technical solution relates to a magnetic circuit part, which is used for a direct-acting relay, and includes: a coil frame, which is provided with an axial hole extending along a first direction; a magnetic conductive plate, which is located at one end of the coil frame along the first direction; a magnetic conductive sleeve, which is fixed to the coil frame and located in the axial hole; a moving iron core, which slides with the magnetic conductive sleeve in the axial hole along the first direction to attract or move away from the magnetic conductive plate; and a bushing, which is made of non-magnetic material and is located in the axial hole, which is located between the magnetic conductive plate and the magnetic conductive sleeve along the first direction, and slides with the moving iron core along the first direction.

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

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

[0009] The fourth technical solution is based on the second technical solution, wherein the bushing and the magnetic conductive sleeve are plugged together along the first direction.

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

[0011] The sixth technical solution is based on the fifth technical solution, wherein one of the bushing and the magnetic conductive sleeve is provided with an insertion hole surrounding the moving iron core, and the other is provided with an insertion portion also surrounding the moving iron core, and the insertion hole and the insertion portion are interference fit.

[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, ceramic or Teflon.

[0013] The eighth technical solution is based on any one of the first to sixth technical solutions, wherein the magnetic 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 conductive sleeve along the first direction is greater than the length of the bushing along the first direction.

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

[0016] The eleventh technical solution is based on the tenth technical solution, wherein the contact part includes a pushing member and a moving contact member, the moving contact member is provided with two moving contacts, and the static contact is provided with two static contacts corresponding to the two moving contacts, and the pushing member is fixedly connected to the moving iron core to drive the moving contact member along a first direction so that the two moving contacts and the two static contacts are closed or disconnected along the first direction.

[0017] The twelfth technical scheme relates to a direct-acting relay, which includes a contact part and a magnetic circuit part as described in any one of the second to sixth technical schemes; the contact part includes a pushing member, a moving contact, two static contacts and a positioning assembly; the moving contact is provided with two moving contacts corresponding to the two static contacts, the pushing member is fixedly connected to the moving iron core to drive the moving contact along a first direction, so that the two moving contacts and the two static contacts are closed or disconnected along the first direction; the two static contacts abut against the positioning assembly along the first direction and are positioned by the positioning assembly, and the positioning assembly abuts against the magnetic conductive plate along the first direction and is positioned by the magnetic conductive plate.

[0018] The thirteenth technical solution is based on the twelfth technical solution, wherein the magnetic circuit part also includes a magnetic conductive part, which is connected to the magnetic conductive plate and the magnetic conductive sleeve, and when the two moving contacts are disconnected from the two static contacts, the end of the pushing member away from the moving contact abuts against the magnetic conductive part along the first direction.

[0019] Compared with the prior art, the above solution has the following beneficial effects:

[0020] The applicant has discovered 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 requirements is that, in the process of the moving iron core moving upward along the first direction and being attracted by the magnetic plate, the guiding effect of the magnetic sleeve on the moving iron core becomes smaller and smaller as the moving iron core moves upward. Therefore, the moving iron core is prone to deflection during the upward movement, causing the pushing member fixed to it to also deflect, resulting in the contact pressure between the moving contact and the static contact on one side failing to meet the design requirements, resulting in poor contact or even no contact, which increases the resistance value and even causes an arc between the moving contact and the static contact.

[0021] The applicant further discovered that the skewed movement of the moving iron core may also cause the arc of one side of the moving contact to not be extinguished as designed during the disconnection process, causing severe erosion of the single-sided contact and even product damage due to the reignition of the arc.

[0022] In the first technical solution, a bushing made of non-magnetic material and slidingly matched with the moving iron core is added between the magnetic plate and the magnetic sleeve along the first direction, so that the moving iron core is always fully guided in the process of moving upward along the first direction and engaging with the magnetic plate. Therefore, the moving iron core is less likely to deflect in the process of upward movement than in the prior art, the contact pressure of the two moving contacts and the corresponding static contacts is more balanced, and the moving contact can be closed more reliably with the static contact. Compared with the prior art, it can better ensure that the resistance value meets the design requirements when the relay is closed. In the process of disconnecting the moving contact from the static contact, the arc is easier to extinguish correctly, and the life of the contact and the life of the relay are higher than in the prior art.

[0023] In the second technical solution, the magnetic plate's engaging surface facing the moving iron core abuts against the first end surface of the bushing facing the magnetic plate. Therefore, compared with the technical solution in which the magnetic plate abuts against the coil frame, it is easier to ensure that the guide channel formed by the bushing is perpendicular to the magnetic plate, and the moving iron core is less likely to deflect during the upward movement along the first direction. This is because, when the magnetic plate abuts against the coil frame, due to the large area of ​​the retaining wall of the coil frame, the flatness of the end surface of the retaining wall is more difficult to ensure than the end surface of the bushing, so the magnetic plate is prone to deflection relative to the shaft hole.

[0024] The third technical solution is based on the second technical solution, and further limits the second end face of the bushing facing away from the magnetic plate to abut against the magnetic sleeve. Therefore, it is easier to ensure that the guide channel formed by the bushing and the magnetic sleeve is perpendicular to the magnetic plate, and the moving iron core is less likely to deflect during the upward movement along the first direction.

[0025] In the fourth technical solution, the bushing and the magnetic sleeve are plugged together along the first direction, so that the bushing and the magnetic sleeve can form a relatively fixed whole without the need for a coil frame, which makes it easier to ensure that the guide channel formed by the bushing and the magnetic sleeve is perpendicular to the magnetic plate, and the moving iron core is less likely to deflect during the upward movement along the first direction.

[0026] In the fifth technical solution, the bushing and the magnetic sleeve are plugged in an interference fit, so that the combination of the two is tighter and less likely to move relative to each other. The guide channel formed by the bushing and the magnetic sleeve is more likely to be perpendicular to the magnetic plate, and the moving iron core is less likely to deflect during the upward movement along the first direction. The shaft hole and the magnetic sleeve or bushing are interference fit, so that the whole formed by the magnetic sleeve and the bushing can be fixed relative to the coil frame.

[0027] In the sixth technical solution, the bushing and the magnetic sleeve are interference fit with the plug-in hole and the plug-in part surrounding the moving iron core, which makes it easier to ensure the coaxiality of the guide channel formed by the bushing and the magnetic sleeve, and the guiding effect is better. The moving iron core is less likely to deflect during the upward movement along the first direction.

[0028] In the seventh technical solution, the material of the bushing is non-injection molded material such as metal, ceramic or Teflon. Compared with injection molded materials, it is easier to ensure the verticality of the guide channel of the bushing and the end face of the bushing. Therefore, the moving iron core is less likely to deflect during the upward movement along the first direction.

[0029] In the eighth technical solution, the magnetic sleeve adopts an oil-free bearing, and the outer surface of the oil-free bearing is coated with wear-resistant materials with a low friction coefficient such as Teflon, so that the magnetic sleeve can guide the moving iron core more smoothly.

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

[0031] The tenth and eleventh technical solutions are applications of the magnetic circuit portion defined by the technical solutions they reference on direct-acting relays, and therefore have corresponding technical effects.

[0032] In the twelfth technical scheme, the attraction surface of the magnetic plate abuts against the first end surface of the bushing part. Since the area of ​​the first end surface of the bushing part is smaller than the area of ​​the end surface of the retaining wall of the coil frame, it is easier to ensure the flatness. Therefore, the verticality of the first end surface of the bushing part and the attraction surface of the magnetic plate and the guide channel can be ensured. The positioning assembly is positioned by the magnetic plate, and the two static contacts are positioned by abutting against the two static contacts, so that the positioning reference of the two static contacts is based on the magnetic plate and the bushing part. Therefore, it can be ensured that the two static contacts are less likely to deflect relative to the magnetic plate and the guide channel than the prior art.

[0033] The thirteenth technical scheme is based on the twelfth technical scheme, and further limits the end of the pushing member away from the moving contact to abut the magnetic conductive member when the moving contact and the static contact are disconnected. On the basis that the two static contacts are less likely to deflect relative to the magnetic conductive plate and the guide channel than the prior art, the consistency of the contact gap between the two static contacts and the corresponding moving contacts is further improved compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

[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 the direct-acting relay in the first embodiment;

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

[0038] Figure 4 It is a three-dimensional diagram of the magnetic conductive sleeve in the second embodiment;

[0039] Figure 5 is a three-dimensional diagram of the bushing in the second embodiment;

[0040] Figure 6 This is a schematic diagram of the structure of the direct-acting relay in Example 3.

[0041] Description of main reference numerals:

[0042] 1. Direct-acting relay; 100. Magnetic circuit; 110. Coil frame; 111. Shaft; 112. Retaining wall; 113. Protrusion; 114. Shaft hole; 120. Coil; 130. Magnetic plate; 140. Magnetic sleeve; 141. Sleeve; 142. Connecting part; 150. Magnetic member; 160. Moving iron core; 161. Spring mounting hole; 162. Glue injection groove; 170. First elastic member; 180. Bushing ; 181, sliding fitting hole; 182, plug-in hole; 200, contact portion; 210, pushing member; 211, pushing rod; 212, pushing seat; 220, moving contact member; 221, moving contact point; 230, second elastic member; 240, static contact member; 241, static contact point; 250, positioning assembly; 251, first positioning member; 252, second positioning member; 300, shell; a, protrusion; Z, first direction. DETAILED DESCRIPTION

[0043] In the claims and the description, unless otherwise defined, the terms "first", "second" or "third", etc. are intended to distinguish different objects rather than to describe a specific order.

[0044] In the claims and the specification, unless otherwise defined, terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings and are only for the convenience of simplifying the description and do not imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction.

[0045] In the claims and the specification, unless otherwise defined, the term "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method in which there is no displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0046] In the claims and the description, unless otherwise defined, the terms "includes", "has" and their variations mean "including but not limited to".

[0047] In the claims and the specification, unless otherwise defined, the term "provided with" means that the technical feature located thereafter is a part of the technical feature located therefor.

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

[0049] Embodiment 1

[0050] See also Figure 2 , Figure 2 FIG. 1 shows a direct-acting relay 1 in the first embodiment. Figure 2 As shown, the direct-acting relay 1 includes a magnetic circuit portion 100 , a contact portion 200 , and a housing 300 .

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

[0052] like Figure 2 As shown, the material of the coil frame 110 is plastic. The coil frame 110 is provided with a shaft 111 and two retaining walls 112. The shaft 111 extends along the first direction Z, and the two retaining walls are perpendicular to the first direction Z and are respectively located at both ends of the shaft 111 along the first direction Z. The retaining wall located in the upper direction along the first direction Z is provided with a protrusion 113 extending upward along the first direction Z. An axial hole 114 is provided at the center of the coil frame 110, and the axial hole 114 passes through the shaft 111 and the two retaining walls 112 along the first direction Z. In this embodiment, the cross section of the axial hole 114 is circular.

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

[0054] like Figure 2 As shown, the material of the magnetic conductive plate 130 is a magnetic conductive material. The magnetic conductive plate 130 is located at the upper end of the coil frame 120 along the first direction Z. The magnetic conductive plate 130 is provided with an assembly hole, and the assembly hole is for the protrusion 113 to pass through. The protrusion 113 is interference-fitted with the assembly hole, so that the magnetic conductive plate 130 is fixed relative to the coil frame 120.

[0055] like Figure 2As shown, the material of the magnetic sleeve 140 is a magnetic material. In this embodiment, the magnetic sleeve 140 is an oil-free bearing, and a wear-resistant layer is provided on its inner surface. The friction coefficient of the wear-resistant layer is small, and the specific material of the wear-resistant layer is Teflon. In this embodiment, the magnetic sleeve 140 is annular and is arranged around the moving iron core 160. The magnetic sleeve 140 is located in the middle and lower part of the shaft hole 114 along the first direction Z, and is interference-fitted with the shaft hole 114, so that the magnetic sleeve 140 is fixed relative to the coil frame 110. The lower end of the magnetic sleeve 140 extends out of the shaft hole 114.

[0056] like Figure 2 As shown, the material of the magnetic conductive member 150 is a magnetic conductive material. The magnetic conductive member 150 is arranged around the coil frame 110 and is cup-shaped or U-shaped. In this embodiment, it is cup-shaped. The cup side wall of the magnetic conductive member 150 is connected to the magnetic conductive plate 130. The cup bottom wall of the magnetic conductive member 150 is connected to the lower end of the magnetic conductive sleeve 140. In other embodiments, the magnetic conductive member 150 can also be integrally formed with the magnetic conductive sleeve 140.

[0057] like Figure 2 As shown, the moving iron core 160 slides with the magnetic sleeve 140 in the shaft hole 114 along the first direction Z to attract or move away from the magnetic plate 130. A threaded hole is provided in the center of the moving iron core 160 along the first direction Z, and a spring mounting hole 161 is provided above the threaded hole. The diameter of the spring mounting hole 161 is larger than the diameter of the threaded hole. A glue injection groove 162 is provided below the threaded hole. The diameter of the glue injection groove 162 is larger than the diameter of the threaded hole.

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

[0059] like Figure 2 As shown, the bushing 180 is made of a non-magnetic material, which may be metal, ceramic or Teflon, more preferably Teflon. In this embodiment, the bushing 180 is in a circular ring shape, and the bushing 180 is arranged around the moving iron core 160. The bushing 180 is located between the magnetic plate 130 and the magnetic sleeve 140 along the first direction Z, and is slidably matched with the moving iron core 160 along the first direction Z. In this embodiment, the suction surface of the magnetic plate 130 facing the moving iron core 160 is reliably abutted against the first end surface of the bushing 180 facing the magnetic plate 130, and the second end surface of the bushing 180 facing away from the magnetic plate 130 is reliably abutted against the upper end surface of the magnetic sleeve 140. In this embodiment, the length of the bushing 180 along the first direction Z is less than the length of the magnetic sleeve 140 along the first direction Z.

[0060] like Figure 2 As shown, the contact portion includes a pushing member 210 , a moving contact member 220 , a second elastic member 230 and two stationary contact members 240 .

[0061] like Figure 2 As shown, the push member 210 includes a push rod 211 and a push seat 212. The push seat 212 is fixed to the top of the stack moving rod 211 along the first direction Z. The push rod 211 extends along the first direction Z and is fixed to the moving iron core 160. Specifically, the threads of the push rod 211 and the moving iron core 160 are also screwed. After the push rod 211 is screwed to the moving iron core 160, the push rod 211 and the moving iron core 160 are reliably kept relatively fixed by injecting glue into the glue injection groove 162. In this embodiment, when the bottom end of the push rod 211 pushes downward against the bottom wall of the cup of the magnetic conductive member 150, the downward movement of the moving iron core 160 along the first direction Z reaches the limit position. At this time, the moving iron core 160 is still in sliding cooperation with the bushing 180 and the magnetic conductive sleeve 140. Similarly, the moving iron core 160 moves upward along the first direction until it reaches the limit position when it is attracted to the attraction surface of the magnetic conductive plate 130. At this time, the moving iron core 160 is still in sliding cooperation with the bushing 180 and the magnetic conductive sleeve 140 .

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

[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 2 As shown, the two stationary contacts 240 are arranged perpendicular to the first direction Z and are respectively provided with stationary contacts 241 . The stationary contacts 241 are arranged downward along the first direction Z and are opposite to the corresponding moving contacts 221 .

[0065] like Figure 2 As shown, the housing 300 is used to accommodate the magnetic circuit part 100 and the contact part 200. The coil frame 110, the coil 120, the magnetic conductive plate 130, the magnetic conductive sleeve 140, the magnetic conductive member 150, the bushing 180, and the two static contact members 240 are all fixed relative to the housing 300. The moving iron core 160, the pusher 210, and the moving contact member 220 all move relative to the housing 300 along the first direction Z. The first elastic member 170 and the second elastic member 230 are both elastically deformed relative to the housing 300 along the first direction.

[0066] The direct-acting relay 1 in this embodiment further includes two coil terminals and two load terminals extending out of the housing 300. The two coil terminals are electrically connected to the coil 120 and are externally connected to the signal circuit. The two load terminals are electrically connected to the two stationary contacts 240 and are externally connected to the load circuit.

[0067] In the direct-acting relay 1 of this embodiment, when the signal circuit applies voltage to the two coil terminals to energize the coil 120, the magnetic field generated by the coil 120 pushes the moving iron core 160 to move upward along the first direction Z in the guide channel formed by the magnetic sleeve 140 and the bushing 180. During this process, the first elastic member 170 is compressed and deformed and stores energy. As the moving iron core 160 moves upward, the pusher 210 fixed to the moving iron core 160 also moves upward, and drives the moving contact 220 to move upward through the second elastic member 230 until the moving contact 221 contacts the corresponding static contact 241, and the external load circuit is turned on through one of the static contacts 240, the moving contact 220 and the other static contact 240. After the moving contact 221 contacts the corresponding static contact 241, the moving iron core 160 continues to move upward until it is attracted to the magnetic plate 130. During this process, the push member 210 continues to move upward to form an overtravel, and the second elastic member 230 is compressed and deformed and stores energy, so that the moving contact 221 is more reliably closed with the static contact 241.

[0068] In the direct-acting relay 1 of this embodiment, when the two coil terminals lose voltage and the coil 120 is powered off, the first elastic member 170 recovers its deformation and releases energy, driving the moving iron core 160 to move downward along the first direction Z, and driving the push member 210 to move downward together, until the second elastic member 230 recovers its deformation, driving the moving contact 220 to move downward, so that the moving contact 221 moves away from the static contact 241 along the first direction Z, and the load circuit is disconnected. Until the bottom end of the push rod 211 hits the bottom wall of the cup of the magnetic member 150, the moving iron core 160 stops moving downward, at which time, the moving iron core 160 moves away from the magnetic plate 130 along the first direction Z, and the moving contact 221 moves away from the static contact 241 along the first direction Z.

[0069] In this embodiment, a bushing 180 made of non-magnetic material and slidingly matched with the moving iron core 160 is added between the magnetic plate 130 and the magnetic sleeve 140 along the first direction Z, so that the moving iron core 160 is always fully guided in the process of moving upward along the first direction Z and engaging with the magnetic plate 130. Therefore, the moving iron core 160 is less likely to deflect in the process of upward movement than in the prior art, and the contact pressure between the two moving contacts 221 and the corresponding static contacts 241 is more balanced. The moving contact 221 can be closed more reliably with the static contact 241, and compared with the prior art, it can be better ensured that the resistance value of the relay 1 meets the design requirements when it is closed. In the process of disconnecting the moving contact 221 from the static contact 241, the arc is more likely to be extinguished correctly, and the life of the contacts and the life of the relay 1 are higher than in the prior art.

[0070] In this embodiment, the attracting surface of the magnetic plate 130 facing the moving iron core 160 abuts against the first end surface of the bushing 180 facing the magnetic plate 130. Therefore, compared with the technical solution in which the magnetic plate 130 abuts against the retaining wall 112 of the coil frame 110, it is easier to ensure that the guide channel formed by the bushing 180 is perpendicular to the magnetic plate 130, and the moving iron core 160 is less likely to deflect during the upward movement along the first direction Z. This is because, when the magnetic plate 130 abuts against the coil frame 110, due to the large area of ​​the retaining wall 112 of the coil frame 110, the flatness of the end surface of the retaining wall 112 is more difficult to ensure than the end surface of the bushing 180, so the magnetic plate 130 is prone to deflect relative to the shaft hole 114.

[0071] In this embodiment, the second end surface of the bushing 180 facing away from the magnetic plate 130 abuts against the magnetic sleeve 140, thereby making it easier to ensure that the guide channel formed by the bushing 180 and the magnetic sleeve 140 is perpendicular to the magnetic plate 130, and the moving iron core 180 is less likely to deflect during the upward movement along the first direction Z.

[0072] In this embodiment, the material of the bushing 180 is non-injection molded material such as metal, ceramic, or Teflon. Compared with injection molded materials, it is easier to ensure the verticality of the guide channel of the bushing 180 and the end face of the bushing 180. Therefore, the moving iron core 160 is less likely to deflect during the upward movement along the first direction Z.

[0073] In this embodiment, the magnetic sleeve 140 adopts an oil-free bearing, and the outer surface of the shaftless bearing is coated with a wear-resistant material with a small friction coefficient such as Teflon, so that the magnetic sleeve 140 can guide the moving iron core 160 more smoothly.

[0074] In this embodiment, the length of the magnetic sleeve 140 along the first direction Z is greater than the length of the bushing 180 along the first direction, so that the magnetic conductive area of ​​the moving iron core 160 and the magnetic conductive sleeve 140 is larger, and the magnetic conductive efficiency between the moving iron core 160 and the magnetic conductive sleeve 140 is better guaranteed.

[0075] Embodiment 2

[0076] See also Figures 3 to 5 , Figures 3 to 5 The structure and relationship between the magnetic conductive sleeve 140 and the bushing 180 in the second embodiment are shown. Figure 3 As shown, in this embodiment, the magnetic conductive sleeve 140 and the bushing 180 are plugged together along the first direction Z. Figure 4 As shown, in this embodiment, the magnetic conductive sleeve 140 is provided with a sleeve body 141 and an inserting portion 142, and the inserting portion 142 is formed by extending upward from the upper end surface of the sleeve body 141 along the first direction Z. The outer diameter of the inserting portion 142 is smaller than the outer diameter of the sleeve body 141. Figure 5As shown, in this embodiment, the bushing 180 is provided with a sliding fitting hole 181 and a plug hole 182 along the first direction Z, and the sliding fitting hole 181 is located above the plug hole 182 along the first direction Z. The plug hole 182 and the plug part 142 are both arranged around the moving iron core 160, and the two are interference fit, so that the magnetic sleeve 140 and the bushing 180 are relatively fixed. In this embodiment, the shaft hole 114 is interference fit with the magnetic sleeve 140 or the bushing 180, so that the whole formed by the magnetic sleeve 140 and the bushing 180 is fixed relative to the coil frame 110. The bushing 180 in this embodiment is made of non-magnetic material, which can be metal, ceramic or Teflon, preferably Teflon.

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

[0078] The bushing 180 and the magnetic sleeve 140 in this embodiment are plugged together along the first direction Z, so that the bushing 180 and the magnetic sleeve 140 can form a relatively fixed whole without the need for the coil frame 110, which makes it easier to ensure that the guide channel formed by the bushing 180 and the magnetic sleeve 140 is perpendicular to the magnetic plate 130, and the moving iron core 160 is less likely to deviate during the upward movement along the first direction Z.

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

[0080] The bushing 180 and the magnetic sleeve 140 in this embodiment are interference fit with the plug-in hole 182 surrounding the moving iron core 160 and the plug-in portion 142, which makes it easier to ensure the coaxiality of the guide channel formed by the bushing 180 and the magnetic sleeve 140, and the guiding effect is better. The moving iron core 160 is less likely to deflect during the upward movement along the first direction Z.

[0081] Embodiment 3

[0082] See also Figure 6 , Figure 6The direct-acting relay 1 in the third embodiment is shown. In the third embodiment, the contact part 200 further includes a positioning assembly 250, the two static contacts 241 respectively abut against the positioning assembly 250 and are positioned by the positioning assembly 250, and the positioning assembly 250 abuts against the magnetic conductive plate 130 and is positioned by the magnetic conductive plate 130. Specifically, the positioning assembly 250 includes a first positioning member 251 and a second positioning member 252, the first positioning member 251 abuts against the magnetic conductive plate 130 along the first direction Z, the second positioning member 252 is fixedly connected to the first positioning member 251, and the two static contacts 241 respectively abut against the second positioning member 252 along the first direction Z.

[0083] The other parts of this embodiment are the same as those of the first embodiment.

[0084] In the present embodiment, the attraction surface of the magnetic conductive plate 130 abuts against the first end surface of the bushing portion 180. Since the area of ​​the first end surface of the bushing portion 180 is smaller than the area of ​​the end surface of the retaining wall 112 of the coil frame 110, it is easier to ensure flatness. Therefore, the verticality of the first end surface of the bushing portion 180 and the attraction surface of the magnetic conductive plate 130 and the guide channel can be ensured. The positioning assembly 250 is positioned by the magnetic conductive plate 130 and abuts against the two static contacts 241 to position the two static contacts 241, so that the positioning reference of the two static contacts 241 is based on the magnetic conductive plate 130 and the bushing portion 180. Therefore, it can be ensured that the two static contacts 142 are less likely to deviate relative to the magnetic conductive plate 130 and the guide channel than the prior art.

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

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

Claims

1. A magnetic circuit part, which is used for a direct-acting relay (1), characterized in that: include: A coil frame (110) having an axial hole (114) extending along a first direction (Z); A magnetic conductive plate (130) located at one end of the coil frame (110) along a first direction (Z); A magnetic conductive sleeve (140) fixedly connected to the coil frame (110) and located in the shaft hole (114); A moving iron core (160) which slides in cooperation with the magnetic conductive sleeve (140) in the shaft hole (114) along a first direction (Z) to attract or move away from the magnetic conductive plate (13); and The bushing (180) is made of a non-magnetic material and is located in the shaft hole (114). It is located between the magnetic plate (130) and the magnetic sleeve (140) along the first direction (Z) and is slidably matched with the moving iron core (160) along the first direction (Z).

2. A magnetic circuit portion as claimed in claim 1, characterized in that: The attraction surface of the magnetic conductive plate (130) facing the moving iron core (160) abuts against the first end surface of the bushing (180) facing the magnetic conductive plate (130).

3. A magnetic circuit portion as claimed in claim 2, characterized in that: The second end surface of the bushing (180) facing away from the magnetic conductive plate (130) abuts against the magnetic conductive sleeve (140).

4. A magnetic circuit portion as claimed in claim 2, characterized in that: The bushing (180) and the magnetic conductive sleeve (140) are plug-fitted together along a first direction (Z).

5. A magnetic circuit portion as claimed in claim 4, characterized in that: The bushing (180) is plug-fitted with the magnetic conductive sleeve (140) by interference, and the shaft hole (114) is interference-fitted with the magnetic conductive sleeve (140) or the bushing (180).

6. A magnetic circuit portion as claimed in claim 5, characterized in that: One of the bushing (180) and the magnetic sleeve (140) is provided with an insertion hole (182) surrounding the moving iron core (160), and the other is provided with an insertion portion (142) also surrounding the moving iron core (160), and the insertion hole (182) and the insertion portion (142) are interference fit.

7. A magnetic circuit portion according to any one of claims 1 to 6, characterized in that: The material of the bushing (180) is metal, ceramic or Teflon.

8. A magnetic circuit portion according to any one of claims 1 to 6, characterized in that: The magnetic conductive sleeve (140) is an oil-free bearing.

9. A magnetic circuit portion according to any one of claims 1 to 6, characterized in that: The length of the magnetic conductive sleeve (140) along the first direction (Z) is greater than the length of the bushing (180) along the first direction (Z).

10. A direct-acting relay, characterized in that: It comprises a contact portion (200) and a magnetic circuit portion (100) as described in any one of claims 1 to 9; the contact portion comprises a moving contact (221) and a stationary contact (241); the moving iron core (160) drives the moving contact (221) to close or open with the stationary contact (241) along a first direction (Z).

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

12. A direct-acting relay, characterized in that: It comprises a contact portion (200) and a magnetic circuit portion (100) as described in any one of claims 2 to 6; the contact portion comprises a pushing member (210), a moving contact member (220), two stationary contacts (241) and a positioning assembly (250); the moving contact member (220) is provided with two moving contacts (221) corresponding to the two stationary contacts (241), the pushing member (220) is fixedly connected to the moving iron core (160) to drive the moving contact member (220) along a first direction (Z), so that the two moving contacts (221) and the two stationary contacts (241) are closed or disconnected along the first direction (Z); the two stationary contacts (241) abut against the positioning assembly (250) along the first direction (Z) and are positioned by the positioning assembly (250), and the positioning assembly (250) abuts against the magnetic conductive plate (130) along the first direction (Z) and is positioned by the magnetic conductive plate (130).

13. A direct-acting relay as claimed in claim 12, characterized in that: The magnetic circuit portion (100) further comprises a magnetic conductive member (150), wherein the magnetic conductive member (150) is connected to the magnetic conductive plate (130) and the magnetic conductive sleeve (140), and when the two moving contacts (221) are disconnected from the two static contacts (241), one end of the pushing member (210) away from the moving contact (221) abuts against the magnetic conductive member (150) along a first direction (Z).

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