An electromagnetic relay applicable to three-phase alternating current

Abstract

The application discloses an electromagnetic relay applicable to three-phase alternating current, which comprises a base and a magnetic circuit part, wherein the magnetic circuit part comprises a coil holder provided with an iron core and an enameled wire, an armature and a yoke connected with the iron core, the coil holder is horizontally arranged on the base, the armature is arranged at a cutting edge of the yoke and is matched with a pole surface of the iron core, and the electromagnetic relay further comprises at least three groups of parallel contact units, each group of the contact units comprises a moving spring part and a static spring part, the moving spring part and the static spring part are arranged on the base and are matched correspondingly, and the armature is connected with the moving spring part of each contact unit through a push card to drive the moving spring part to act. The electromagnetic relay is applicable to three-phase alternating current, has a monostable function and can realize forced guiding through the push card, so that the safety performance of the electromagnetic relay is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an electromagnetic relay, in particular to an electromagnetic relay applicable to three-phase alternating current. BACKGROUND

[0002] The electromagnetic relay is a kind of relay which uses electromagnetic force to drive mechanical components to produce predetermined response, which generally consists of magnetic circuit part, moving spring part, static spring part, base and shell, the magnetic circuit part includes iron core, coil holder with enameled wire, armature, yoke, etc. When the coil (i.e. enameled wire) passes through the current, electromagnetic force is generated, the armature is attracted to contact the pole surface at one end of the iron core, thereby driving the moving contact of the moving spring part to contact or separate from the static contact of the static spring part; when the current in the coil disappears, the electromagnetic force disappears, the armature resets and separates from the pole surface at one end of the iron core, thereby separating or contacting the moving contact of the moving spring part from the static contact of the static spring part. Through the contact or separation of the moving contact and the static contact, the purpose of turning on or turning off the circuit is achieved.

[0003] The electromagnetic relay of the prior art is generally applicable to single-phase circuit, only a few electromagnetic relays are applicable to three-phase alternating current, but such electromagnetic relays do not have the function of monostable state, or do not have the function of forced guidance, etc. SUMMARY

[0004] The present application provides an electromagnetic relay applicable to three-phase alternating current in view of the technical problems existing in the prior art.

[0005] The technical scheme adopted by the present application to solve the technical problems is: an electromagnetic relay applicable to three-phase alternating current, comprising a base and a magnetic circuit part, the magnetic circuit part comprising a coil holder provided with an iron core and enameled wire, an armature and a yoke connected with the iron core, the coil holder being horizontally placed on the base, the armature being arranged at the cutting edge of the yoke and cooperating with the pole surface of the iron core; further comprising at least three groups of contact units arranged in parallel, each group of contact units comprising a moving spring part and a static spring part, the moving spring part and the static spring part being arranged on the base and cooperating correspondingly; the armature being connected with the moving spring part of each contact unit through a push card to drive each moving spring part to act.

[0006] Further, the magnetic circuit part and the contact units are respectively located in different cavities of the base.

[0007] Further, the lead-out pins of the moving spring part and the lead-out pins of the static spring part are located at opposite ends of the base.

[0008] Further, one end of the push card is provided with an insulating connecting piece, the connecting piece is provided with a slot, and the end of the armature away from the pole surface of the iron core is inserted into the slot and covered by the slot.

[0009] Further, the portion of the armature matched with the pole surface of the iron core is bent to be inclined towards the side away from the iron core.

[0010] Further, the moving spring portion is provided with an anti-short-circuit current structure, which comprises a moving spring lead sheet, a rigid spring sheet and a flexible connecting piece, the moving spring lead sheet is inserted into the base, and the bottom of the moving spring lead sheet forms a lead foot of the moving spring portion, the top of the rigid spring sheet is rotationally connected with the top of the moving spring lead sheet, so that the rigid spring sheet can rotate towards the direction away from or close to the moving spring lead sheet, and the flexible connecting piece is further connected between the top of the rigid spring sheet and the top of the moving spring lead sheet; the bottom of the rigid spring sheet is provided with a moving contact on the side opposite to the moving spring lead sheet; the push card is provided with a plurality of card slots along the length direction, and the plurality of card slots correspond to the at least three groups of moving spring portions one by one, and the rigid spring sheet of each moving spring portion is clamped in the corresponding card slot.

[0011] Further, the moving spring portion further comprises a counter-force spring sheet, which is located between the moving spring lead sheet and the rigid spring sheet, and the bottom of the counter-force spring sheet is fixedly connected with the rigid spring sheet, the top of the counter-force spring sheet has a preset interval with the top of the rigid spring sheet, and the top of the counter-force spring sheet is clamped in the card slot.

[0012] Further, the push card is provided with a limiting piece at one end close to the armature, the limiting piece is matched with a first partition wall provided on the base to limit the pushing stroke of the push card, and the first partition wall is located between the armature and a contact unit adjacent to the armature; the end of the push card away from the armature is matched with the moving spring lead sheet farthest away from the armature to limit the reset stroke of the push card.

[0013] Further, the auxiliary moving spring sheet provided with an auxiliary moving contact and the auxiliary static spring sheet provided with an auxiliary static contact are further included, and the two are inserted into the base and located on the side where the armature is located; the push card or the armature is provided with a driving part matched with the auxiliary moving spring sheet to drive the auxiliary moving spring sheet to act; the action state of the auxiliary moving spring sheet is opposite to the action state of the moving spring portion.

[0014] Further, the yoke iron is inserted with a reset spring sheet between the base, the reset spring sheet limits the armature and provides the reset of the armature; the coil holder is located along the length direction of the base, the at least three groups of contact units are distributed along the length direction of the base, the moving spring portion of each contact unit is vertically arranged and distributed along the width direction of the base, the push card is located along the length direction of the base, and the push card is up and down limited by a second partition wall provided by the base between adjacent contact units.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. Since the present invention also includes at least three sets of parallel-distributed contact units, each set of contact units includes a moving spring part and a stationary spring part, which are respectively disposed on the base and cooperate with each other; the armature is connected to the moving spring part of each contact unit through a push card to drive each moving spring part to move, so that the present invention is not only applicable to three-phase AC power, but also has a monostable function, and can use the push card to achieve forced guidance, thereby improving the safety performance of the present invention.

[0017] 2. Since the magnetic circuit portion and each contact unit are located in different cavities of the base, the creepage distance and air gap between the magnetic circuit portion and the contact unit, and between adjacent contact units, are relatively large, thereby further improving the safety performance of the present invention.

[0018] 3. The leads of the moving spring and the leads of the stationary spring are located at opposite ends of the base, which avoids the space being too crowded and inconvenient for wiring and the possibility of short circuits caused by the leads of the moving spring and the leads of the stationary spring being located on the same side, thereby further improving the safety performance of the present invention.

[0019] 4. One end of the push card is provided with an insulating connector with a slot. The end of the armature away from the iron core pole surface is inserted into the slot and is covered by the slot. This not only realizes the connection and fixation between the push card and the armature, but also increases the creepage distance between the armature and the contact unit by using the connector, thereby further improving the safety performance of the present invention.

[0020] 5. The portion of the armature that mates with the pole face of the iron core is bent at an inclination toward the side away from the iron core, so that the rotation angle of the armature is larger, thereby increasing the stroke of the push card. As a result, the contact gap between the moving spring portion and the stationary spring portion in the disconnected state is larger, thereby improving the safety performance of the invention in the disconnected state.

[0021] 6. The moving spring part is designed to withstand short-circuit current, so that the present invention also has the function of resisting short-circuit circuit.

[0022] 7. The present invention also includes an auxiliary moving spring with an auxiliary moving contact and an auxiliary stationary spring with an auxiliary stationary contact, so that the present invention also has the function of monitoring the operating status of the contact unit.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention, which can be applied to three-phase alternating current, is not limited to the embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 (Front view shown, excluding outer casing);

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 (Back view shown, without outer casing);

[0026] Figure 3 This is the front view of the invention (excluding the outer casing);

[0027] Figure 4 This is a top view of the present invention (excluding the outer casing);

[0028] Figure 5 This is a right view of the present invention (excluding the outer casing);

[0029] Figure 6 This is a schematic diagram of the push card structure of the present invention. Detailed Implementation

[0030] For an example, please refer to [link / reference]. Figures 1-6 As shown, an electromagnetic relay applicable to three-phase alternating current according to the present invention includes a base 1, a magnetic circuit part 2, and a housing (not shown in the figure). The magnetic circuit part 2 includes a coil frame 21 containing an iron core 25 and enameled wire 24, an armature 23, and a yoke 22 connected to the iron core 25. The coil frame 21 is horizontally placed on the base 1, and the armature 23 is located at the knife edge of the yoke 22 and mates with the pole face of the iron core 25. The iron core 25 is specifically inserted into the coil frame 21, with both ends exposed. The enameled wire 24 is wound around the outside of the coil frame 21. The yoke 22 is L-shaped, with one side fixedly connected to the end of the iron core 25 away from the armature 23 (or it can be integrally formed), and the other side mates with the side of the coil frame 21. The invention also includes at least three sets of parallel contact units, each set of contact units comprising a moving spring portion 3 and a stationary spring portion 4, which are respectively disposed on the base 1 and cooperate accordingly; the armature 23 is connected to the moving spring portion 3 of each contact unit via a pusher 5 to drive the moving spring portion 3 to move. The coil frame 21 is specifically located along the length direction of the base 1, the at least three sets of contact units are distributed along the length direction of the base 1, and the moving spring portion 3 of each contact unit is vertical and distributed along the width direction of the base 1 with the coil frame 21; the pusher 5 is located along the length direction of the base 1. The number of contact units is specifically four sets, but not limited to this. The outer shell is connected to the base 1, enclosing the magnetic circuit portion 2 and each contact unit within its cavity.

[0031] In this embodiment, the magnetic circuit portion 2 and each contact unit are located in different cavities of the base 1. The lead-out pins 311 of the moving spring portion 3 and 411 of the stationary spring portion 4 are located at opposite ends of the base 1. Specifically, the lead-out pins 311 of the moving spring portion 3 and 411 of the stationary spring portion 4 are located at opposite ends of the width direction of the base 1. This avoids the space being too crowded and inconvenient for wiring, and also prevents short circuits from occurring if the lead-out pins 311 of the moving spring portion 3 and 411 of the stationary spring portion 4 are located on the same side.

[0032] In this embodiment, the push card 5 has an integrally formed insulating connector 51 at one end facing the armature 23. This connector 51 has a slot 511, and the end of the armature 23 furthest from the pole face of the iron core 25 is inserted into and enclosed by the slot 511. Specifically, as shown... Figure 6 As shown, the slot 511 is a U-shaped structure with at least one closed end, and its two opposite slot walls are respectively provided with ribs 512. The surface of the ribs 512 is arc-shaped. After the end of the armature 23 away from the iron core 25 is inserted into the slot 511, it achieves a transition fit with the ribs 512, thereby restricting the end of the armature 23 away from the iron core 25 from coming out.

[0033] In this embodiment, the armature 23 is generally in the shape of a straight line, and the portion of the armature 23 that mates with the pole face of the iron core 25 is bent at an angle toward the side away from the iron core 25, such as... Figure 4 As shown. This allows for a larger rotation angle of the armature 23, resulting in a larger stroke of the push card 5. Consequently, the contact gap between the moving spring portion 3 and the stationary spring portion 4 in the disconnected state is larger, thereby improving the safety performance of the invention in the disconnected state.

[0034] In this embodiment, the movable spring portion 3 is designed to withstand short-circuit current. It includes a movable spring lead-out piece 31, a movable spring piece, and a rigid spring piece 32. The movable spring lead-out piece 31 is inserted into the base 1, and its bottom forms the lead-out foot 311 of the movable spring portion 3. The top of the movable spring piece is connected to the top of the movable spring lead-out piece 31, and a movable contact 33 is provided on the side of the bottom of the movable spring piece facing away from the movable spring lead-out piece 31. The movable spring piece is specifically a rigid spring piece 32, but is not limited to this. In other embodiments, the movable spring piece is an elastic spring piece, and its top is fixedly connected to the top of the movable spring lead-out piece.

[0035] The top of the rigid spring 32 is rotatably connected to the top of the movable spring lead-out piece 31, allowing the rigid spring 32 to rotate in a direction away from or towards the movable spring lead-out piece 31. Specifically, the top of the rigid spring 32 is connected to the top of the movable spring lead-out piece 31 via a rotating shaft 35, and a flexible connector 36 is further connected between the top of the rigid spring 32 and the top of the movable spring lead-out piece 31; the pusher 5 is provided with a plurality of slots 54 at intervals along its length, and these slots 54 correspond one-to-one with the at least three sets of movable spring parts 3, with the movable spring piece (i.e., the rigid spring 32) of each movable spring part 3 respectively locked in the corresponding slot 54.

[0036] In this embodiment, the moving spring portion 3 further includes a reaction spring 34, which is located between the moving spring lead-out piece 31 and the rigid spring piece 32. The bottom of the reaction spring 34 is fixedly connected to the rigid spring piece 32, and there is a preset gap between the top of the reaction spring 34 and the rigid spring piece 32. The top of the reaction spring 34 is engaged in the slot 54. Thus, when the push card 5 is pushed, the rigid spring piece 32 is pushed towards the stationary spring portion 4 by pushing the reaction spring 34, thereby generating overtravel. In this embodiment, the bottom of the rigid spring piece 32 is bent into an inclined shape away from the stationary spring portion 4, which helps to further increase the contact gap between the moving spring portion 3 and the stationary spring portion 4 in the disconnected state. The moving spring lead-out piece 31 of each moving spring portion 3 is provided with a clearance groove for avoiding the push card 5. The push card 5 has a limiting member 53 at one end facing the armature 23. This limiting member 53 cooperates with the first partition wall 11 provided on the base 1 to limit the pushing stroke of the push card 5. The first partition wall 11 is located between the armature 23 and the contact unit adjacent to the armature 23. The end of the push card 5 away from the armature 23 cooperates with the moving spring lead-out piece 31 furthest from the armature 23 to limit the reset stroke of the push card 5. The pushing stroke refers to the stroke generated when the armature 23 is attracted to the pole surface of the iron core 25, causing the push card 5 to move. The reset stroke refers to the stroke generated when the armature 23 is disengaged from the pole surface of the iron core 25, causing the push card 5 to move. When the limiting member 53 contacts the first partition wall 11, the push card 5 is pushed to its limit position. When the end of the push card 5 away from the armature 23 contacts the moving spring lead-out piece 31 furthest from the armature 23, the push card 5 resets to its limit position. The push card 5 is limited in the upper and lower directions by the second partition wall 12 set between adjacent contact units by the base 1. Specifically, the second partition wall 12 is broken into upper and lower parts at the position of the push card 5, which is used to avoid and limit the push card 5 in the upper and lower directions. At the same time, the lower part of the second partition wall 12 can support the push card 5.

[0037] In this embodiment, the invention further includes an auxiliary moving spring 6 with an auxiliary moving contact and an auxiliary stationary spring 7 with an auxiliary stationary contact, both of which are respectively inserted into the base 1 and located on the side where the armature 23 is located; the push card 5 is provided with a driving part 52, which cooperates with the auxiliary moving spring 6 to drive the auxiliary moving spring 6 to move; the operating state of the auxiliary moving spring 6 is opposite to the operating state of the moving spring part 3. That is, when the moving spring part 3 moves in the direction of attraction, the auxiliary moving spring 6 moves in the direction of disengagement, and when the moving spring part 3 moves in the direction of disengagement, the auxiliary moving spring 6 moves in the direction of attraction. The driving part 52 is specifically located at the bottom of the connector 51. In other embodiments, the driving part is located on the armature.

[0038] In this embodiment, a restoring spring 8 is inserted between the yoke 22 and the base 1. The restoring spring 8 limits the armature 23 and provides a reset for the armature 23. Specifically, the armature 23 has a through groove 231 between its rotation fulcrum and the end away from the core 25. One of the folded edges of the restoring spring 8 extends away from the pusher 5, passes through the through groove 231, and rests on the side of the armature 23 facing away from the core 25 (i.e., the outer surface of the armature 23), thereby further limiting the armature 23 and preventing it from falling off. The other folded edge of the restoring spring 8 extends towards the pusher 5, passes through the through groove 231 of the armature 23, and rests on the side of the armature 23 facing away from the core 25 (i.e., the outer surface of the armature 23), to provide a reset for the armature 23.

[0039] In this embodiment, the stationary spring portion 4 includes a stationary spring plate 41 and a stationary contact 42. The stationary spring plate 41 is laterally inserted into the bottom of the base 1 from the width direction of the base 1, and the stationary contact 42 is provided at the end of the stationary spring plate facing the moving spring portion 3. The end of the stationary spring plate 41 away from the moving spring portion 3 extends downward into the base 1 to form the lead-out foot 411 of the stationary spring portion 4. The moving spring lead-out piece 31 is also laterally inserted into the base 1 from the width direction of the base 1.

[0040] The present invention provides an electromagnetic relay applicable to three-phase AC power, which can be used in a three-phase four-wire circuit. Each contact unit has a current carrying capacity of up to 40A and can withstand a short-circuit current of 3kA.

[0041] When the coil (i.e., enameled wire 24) is energized, the armature 23 rotates around the blade of the yoke 22 and engages with the pole face of the iron core 25. Simultaneously, it drives the pusher 5 to move along the length of the base 1, and also drives the reaction spring 34 and rigid spring 32 of the moving spring section 3 to move, thus connecting the moving contact 33 with the stationary contact 42. When the moving contact 33 just contacts the stationary contact 42, the reaction spring 34 begins to deform. After the armature 23 fully contacts the pole face of the iron core 25, the deformation of the reaction spring 34 ends. The overtravel is mainly achieved by the elastic deformation of the reaction spring 34. The rigid spring 32 is only responsible for conducting current and does not deform to achieve the overtravel function. When the coil (i.e., the enameled wire 24) is de-energized, the armature 23 resets under the action of the restoring spring 8, simultaneously causing the pusher 5 to move in the opposite direction, and causing the reaction springs 34 and rigid springs 32 of each moving spring part 3 to move in the opposite direction, thus disconnecting the moving contact 33 from the stationary contact 42. When the moving contact 33 of one set of moving spring parts 3 becomes stuck with the corresponding stationary contact, the pusher 5 cannot reset, preventing the moving contacts 33 of the other sets of moving spring parts 3 from disconnecting from the corresponding stationary contacts, thereby achieving the function of forced guidance.

[0042] The disconnection between the auxiliary moving contact and the auxiliary stationary contact is achieved by the drive part 52 of the push card 5 pushing the head of the auxiliary moving spring 6, while the connection between the auxiliary moving contact and the auxiliary stationary contact is achieved by the reaction force of the auxiliary moving spring 6. The auxiliary contact section and the main contact section (i.e., the contact unit) achieve a high degree of insulation. The auxiliary contact section can monitor the status of the main contact section; regardless of which main contact is stuck, the auxiliary contact cannot close, thus achieving a locking function.

[0043] When a short-circuit current occurs, a Holm force is generated on the surfaces of the moving contact 33 and the stationary contact 42, which causes the moving contact 33 and the stationary contact 42 to repel each other. A Lorentz force is generated in the U-shaped structure formed by the moving spring lead-out piece 31, the moving spring piece 32 and the flexible connector 36, which causes the moving contact 33 to move towards the stationary contact 42, thereby limiting the repulsion between the moving contact 33 and the stationary contact 42.

[0044] The above embodiments are only used to further illustrate an electromagnetic relay applicable to three-phase AC power according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay applicable to three-phase alternating current, comprising a base and a magnetic circuit portion, the magnetic circuit portion comprising a coil frame containing an iron core and enameled wire, an armature, and a yoke connected to the iron core, the coil frame being horizontally placed on the base, the armature being positioned at the knife edge of the yoke and engaging with the pole face of the iron core; characterized in that: It also includes at least three sets of parallel contact units, each set of contact units including a moving spring part and a stationary spring part, which are respectively disposed on the base and cooperate with each other; the armature is connected to the moving spring part of each contact unit through a pusher to drive each moving spring part to move; the at least three sets of contact units are distributed along the length direction of the base, and the moving spring part of each contact unit is vertical and distributed with the coil frame along the width direction of the base; the magnetic circuit part and each contact unit are respectively located in different cavities of the base; the lead-out feet of the moving spring part and the lead-out feet of the stationary spring part are located at opposite ends in the width direction of the base, and the stationary spring part is located below the magnetic circuit part.

2. The electromagnetic relay applicable to three-phase alternating current according to claim 1, characterized in that: The leads of the moving spring and the leads of the stationary spring are located at opposite ends of the base.

3. The electromagnetic relay applicable to three-phase alternating current according to claim 1, characterized in that: The push card has an insulating connector at one end, which has a slot. The end of the armature away from the iron core pole is inserted into the slot and is covered by the slot.

4. The electromagnetic relay applicable to three-phase alternating current according to claim 1, characterized in that: The portion of the armature that mates with the pole face of the iron core is bent at an angle toward the side away from the iron core.

5. The electromagnetic relay applicable to three-phase alternating current according to claim 1, characterized in that: The moving spring section is designed to withstand short-circuit current and includes a moving spring lead-out piece, a rigid spring piece, and a flexible connector. The moving spring lead-out piece is inserted into the base, and its bottom forms the lead-out foot of the moving spring section. The top of the rigid spring piece is rotatably connected to the moving spring lead-out piece, allowing the rigid spring piece to rotate in a direction away from or towards the moving spring lead-out piece. A flexible connector is also connected between the top of the rigid spring piece and the top of the moving spring lead-out piece. A moving contact is provided on the side of the bottom of the rigid spring piece facing away from the moving spring lead-out piece. The push card has several slots spaced apart along its length, and these slots correspond one-to-one with the at least three sets of moving spring sections. The rigid spring pieces of each moving spring section are respectively engaged in the corresponding slots.

6. The electromagnetic relay applicable to three-phase alternating current according to claim 5, characterized in that: The moving spring part also includes a reaction spring, which is located between the moving spring lead-out plate and the rigid spring. The bottom of the reaction spring is fixedly connected to the rigid spring, and there is a preset distance between the top of the reaction spring and the rigid spring. The top of the reaction spring is engaged in the slot.

7. The electromagnetic relay applicable to three-phase alternating current according to claim 5 or 6, characterized in that: The push card has a limiting member at one end facing the armature. This limiting member cooperates with the first partition wall provided on the base to limit the pushing stroke of the push card. The first partition wall is located between the armature and the contact unit adjacent to the armature. The end of the push card away from the armature cooperates with the moving spring lead-out piece furthest from the armature to limit the reset stroke of the push card.

8. The electromagnetic relay applicable to three-phase alternating current according to claim 1, characterized in that: It also includes an auxiliary moving spring with an auxiliary moving contact and an auxiliary stationary spring with an auxiliary stationary contact, which are respectively inserted into the base and located on the side where the armature is located; the push card or armature is provided with a driving part, which cooperates with the auxiliary moving spring to drive the auxiliary moving spring to move; the operating state of the auxiliary moving spring is opposite to the operating state of the moving spring part.

9. The electromagnetic relay applicable to three-phase alternating current according to claim 1, characterized in that: A restoring spring is inserted between the yoke and the base. The restoring spring limits the armature and provides the armature to reset. The coil frame is located in the length direction of the base, and the pusher is located in the length direction of the base. The pusher is limited in the upper and lower directions by a second partition wall set between adjacent contact units on the base.

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