Contact isolation structure of electromagnetic relay

Abstract

The invention discloses an electromagnetic relay contact isolation structure, and relates to the technical field of relays, the electromagnetic relay contact isolation structure comprises a relay main body, a base, an outer cover and an isolation frame, the base is uniformly provided with a plurality of contact sheets, and the bottom of the base is provided with contact tail sheets at positions corresponding to the contact sheets and is electrically connected with the contact sheets; a back plate is fixedly arranged on the rear side of the base, the isolation frame is detachably arranged on the base and the back plate, at least two flash barriers are arranged on the isolation frame, and the plurality of contact sheets are transversely divided into at least two contact groups; according to the invention, the flash barriers are arranged on the isolation frame to separate the contact groups, and the contact areas in each contact group are separated through the stop blocks, so that the contact states of other areas are prevented from being affected by the breakage of the contact sheets, for example, the connection of disconnected contacts is avoided, and the risk of signal upgrading is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to an electromagnetic relay contact isolation structure. Background Art

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled variable in an electrical output circuit when the change in the input (stimulus) reaches a specified level. It interacts between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Commonly used in automated control circuits, it acts as an "automatic switch" that uses a small current to control a large current. Therefore, it performs functions such as automatic regulation, safety protection, and circuit switching within circuits.

[0003] Forced guided relays are a type of relay that are more reliable in industrial safety situations and are suitable for applications requiring high safety.

[0004] The contacts within a force-guided relay typically consist of normally open and normally closed contacts, which are achieved by opening and closing the moving and static contacts, respectively. Due to the force-guided structure within the relay, even if the contacts weld, the two pairs of contacts (normally closed NC / normally open NO) will not connect simultaneously. According to the IEC61810-3 standard, in a NO / NC contact combination, if the NO contact welds, the NC contact will not close even if the relay coil is deenergized (de-energized), and a certain contact gap will be maintained. Furthermore, if the NC contact welds, the NO contact will not close even if the relay coil is powered on (energized), and a certain contact gap will be maintained. Similar structural designs have been disclosed in the prior art, but they fail to prevent contact misconnection caused by single-point failures. For example, if a contact piece breaks, the free contact piece could connect the disconnected contact, causing the risk of signal escalation. Summary of the Invention

[0005] In response to the above-mentioned deficiencies in the prior art, the present invention provides an electromagnetic relay contact isolation structure, which separates the contact groups by arranging arc isolation plates on the isolation frame, and separates the contact areas in each contact group by using blocks, to prevent the breakage of the contact sheets from affecting the contact status of other areas, such as causing the disconnected contacts to be connected, thereby avoiding the risk of causing signal upgrades.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an electromagnetic relay contact isolation structure, comprising a relay body, a base, an outer cover and an isolation frame, wherein a plurality of contact pieces are evenly arranged on the base, a contact tail piece is arranged at the position corresponding to the contact piece at the bottom of the base and is electrically connected to the contact piece, a back plate is fixedly arranged on the rear side of the base, the isolation frame is detachably arranged on the base and the back plate, at least two arc isolation plates are arranged on the isolation frame and the plurality of contact pieces are divided into at least two contact groups horizontally, and the arc isolation plates can be used to connect the contact pieces to each other. The arcs of adjacent contact groups are blocked from the broken contact pieces. Blocks are provided on both sides of the contact piece in the middle of the isolation frame and arc isolation plate in each contact group. A pair of blocks cooperates with the contact piece to divide the contact group longitudinally into at least two contact areas. The blocks can block the broken contact pieces in adjacent contact areas. The relay body is fixedly connected to the base and back plate and electrically connected to the contact pieces. The base, back plate and relay body are inserted into the outer cover from top to bottom, and the contact tail piece passes through the bottom of the outer cover. The top of the outer cover is buckled by a cover plate.

[0007] Preferably, a protrusion is provided at the center position of the rear side wall of the isolation frame, a pair of clips are provided at the bottom of the front side wall of the isolation frame, a through hole is provided at the position corresponding to the protrusion on the back panel, and a slot is provided at the position corresponding to the pair of clips on the base, the protrusion can be inserted into the through hole and the clip can be snapped into the slot at the same time.

[0008] Preferably, a pair of ventilation holes are provided on the front side wall of the isolation frame.

[0009] Preferably, an inner glue channel is provided at the bottom of the base and near the contact tail piece, and an outer glue channel is provided at the bottom of the base and near the edge. The inner glue channel and the outer glue channel are glue-filled and sealed with the outer cover.

[0010] Preferably, the isolation frame, arc isolation plate and stop block are made of dry unsaturated polyester molding compound.

[0011] The present invention provides an electromagnetic relay contact isolation structure, which has the following beneficial effects: 1. The present invention separates the contact groups by arranging arc isolation plates on the isolation frame, and separates the contact areas in each contact group by using blocks, so as to prevent the breakage of the contact sheets from affecting the contact status of other areas, such as causing the disconnection of the contacts, thereby avoiding the risk of causing signal upgrade.

[0012] 2. In the present invention, the protrusions on the rear side wall of the isolation frame cooperate with the through holes of the back plate, and the buckles on the front side wall of the isolation frame cooperate with the slots of the base, so as to achieve the purpose of detachable isolation frame, which is convenient for later repair and maintenance.

[0013] 3. In the present invention, a ventilation hole is provided at the center of the front side wall of the isolation frame. Before assembling the outer cover, air is blown through the ventilation hole for cleaning, and then the outer cover is installed to ensure the cleanliness of the interior of the relay.

[0014] 4. The present invention is provided with outer and inner glue channels at the edge of the bottom surface of the base and a circle near the contact tail, respectively, which cooperate with the outer cover to form a cavity for glue filling and sealing, thereby improving the sealing of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of an overall contact isolation structure of an electromagnetic relay according to the present invention; Figure 2 This is a schematic diagram of the isolation frame after installation in the present invention; Figure 3 Schematic diagram of the isolation frame of the present invention; Figure 4 Schematic diagram of the base and back plate in the present invention; Figure 5 is a schematic diagram of the outer cover and the contact tail in the present invention; Figure 6 is a schematic diagram of the bottom of the base in the present invention; Figure 7 Schematic diagram of the fracture of the contact piece in the present invention.

[0016] In the figure: 1. Isolation frame; 2. Base; 3. Stopper; 4. Ventilation port; 5. Arc isolation plate; 6. Contact piece; 7. Contact group; 8. Contact area; 9. Back plate; 10. Outer cover; 11. Contact tail piece; 12. Relay body; 1-1. Protrusion; 1-2. Buckle; 2-1. Slot; 2-2. Inner rubber track; 2-3. Outer rubber track; 6-1. One group of normally open contacts; 6-2. One group of normally closed contacts; 6-3. Two groups of normally open contacts; 6-4. Two groups of normally closed contacts; 7-1. First group; 7-2. Second group; 7-3. Third group; 7-4. Fourth group; 81. One group of normally open area; 82. One group of normally closed area; 9-1. Through hole. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figure 1-7As shown, an electromagnetic relay contact isolation structure includes a relay body 12, a base 2, an outer cover 10 and an isolation frame 1, wherein a plurality of contact pieces 6 are evenly arranged on the base 2, a contact tail piece 11 is arranged at the bottom of the base 2 corresponding to the position of the contact piece 6 and is electrically connected to the contact piece 6, a back plate 9 is fixedly arranged on the rear side of the base 2, and the isolation frame 1 is detachably arranged on the base 2 and the back plate 9, and at least two arc isolation plates 5 are arranged on the isolation frame 1 and the plurality of contact pieces 6 are divided into at least two horizontal sections. The contact group 7 and the arc isolation plate 5 can block the arcs of the adjacent contact groups 7 and the broken contact pieces 6. The isolation frame 1 and the arc isolation plate 5 in each contact group 7 are provided with blocks 3 on both sides of the contact piece 6 in the middle. A pair of blocks 3 cooperate with the contact piece 6 to divide the contact group 7 into at least two contact areas 8 in the longitudinal direction. The blocks 3 can block the broken contact pieces 6 in the adjacent contact areas 8. The relay body 12 is fixedly connected to the base 2 and the back plate 9 and is electrically connected to the contact piece 6. The base 2. The back plate 9 and the relay body 12 are inserted into the outer cover 10 from top to bottom, and the contact tail 11 passes through the bottom of the outer cover 10. The top of the outer cover 10 is buckled by the cover plate; a protrusion 1-1 is provided at the center of the rear side wall of the isolation frame 1, and a pair of buckles 1-2 are provided at the bottom of the front side wall of the isolation frame 1. A through hole 9-1 is provided on the back plate 9 at a position corresponding to the protrusion 1-1, and a slot 2-1 is provided on the base 2 at a position corresponding to the pair of buckles 1-2. The protrusion 1-1 can be inserted into the through hole 9 -1 and at the same time the buckle 1-2 can be snapped into the slot 2-1; the front side wall of the isolation frame 1 is provided with a pair of ventilation holes 4; the bottom of the base 2 and a circle located near the contact tail 11 are provided with an inner glue channel 2-2, and the bottom of the base 2 and a circle located near the edge are provided with an outer glue channel 2-3, and the inner glue channel 2-2 and the outer glue channel 2-3 are glue-filled and connected and sealed with the outer cover 10; the isolation frame 1, the arc isolation plate 5 and the block 3 are made of dry unsaturated polyester molding material.

[0019] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process, which are as follows: According to the instruction manual Figure 1-7 It can be seen that in the present invention, the arc isolation plate 5 on the isolation frame 1 divides the multiple contact pieces 6 into at least two contact groups 7 horizontally. In each contact group 7, the isolation frame 1 and the arc isolation plate 5 are provided with stoppers 3 on both sides of the contact piece 6 in the middle of the butt joint. The stoppers 3 divide the contact group 7 into at least two contact areas 8 vertically. A possible implementation method is as follows: Figure 2As shown, there are 8 pairs of contact pieces 6, which are arranged in 2 rows and 4 columns. Three arc isolation plates 5 are provided in the 4 columns of contact pieces 6, so that each column of contact pieces 6 forms a contact group 7, thereby forming four groups of contact groups 7, including a first group 7-1, a second group 7-2, a third group 7-3 and a fourth group 7-4. The arc isolation plates 5 can block the arcs and broken contact pieces 6 of adjacent contact groups 7. For example, the arc isolation plates 5 can block a group of normally open contacts 6-1, a group of normally closed contacts 6-2 and two groups of normally open contacts 6. -3. Two groups of normally closed contacts 6-4 are isolated. Each contact group 7 is divided into two contact areas 8 by a pair of blocks 3 and contact pieces 6, including a group of normally open areas 81 and a group of normally closed areas 82. A pair of blocks 3 can block the broken contact pieces 6 of adjacent contact areas 8. For example, a pair of blocks 3 isolates a group of normally open contacts 6-1 from a group of normally closed contacts 6-2, or isolates two groups of normally open contacts 6-3 from two groups of normally closed contacts 6-4, and the same applies to the third group 7-3 and the fourth group 7-4. The present invention separates the contact groups 7 by arranging arc isolation plates 5 on the isolation frame 1, and separates the contact areas 8 in each contact group 7 by using blocks 3, so as to prevent the broken contact pieces from affecting the contact status of other areas, such as causing the disconnected contacts to be connected, thereby avoiding the risk of causing signal upgrades. Figure 7 , the effectiveness of the structural design of the present invention can be clearly observed, that is, when the contact piece 6 breaks, the design of the block 3 and the arc isolation plate 5 makes the space between the moving contact, the block 3 and the base 2 in the relay body 12 very small, and the broken static contact piece 6 will not move through this space no matter how it rotates or moves. It can be seen that the structure of the patent design can ensure that when the contact piece 6 breaks, the free contact piece 6 will not cause the same group of conversion contacts and adjacent contacts to be connected.

[0020] The relay body 12 is fixedly connected to the base 2 and the back plate 9 and is electrically connected to the contact piece 6. The base 2, the back plate 9 and the relay body 12 are inserted into the outer cover 10 from top to bottom, and the contact tail piece 11 passes through the bottom of the outer cover 10. The top of the outer cover 10 is buckled by the cover plate. This is the installation part of the relay, which is existing technology and will not be repeated here.

[0021] The center of the rear sidewall of the isolation frame 1 is provided with a protrusion 1-1, and the bottom of the front sidewall of the isolation frame 1 is provided with a pair of clips 1-2. A through-hole 9-1 is provided on the back panel 9 at a position corresponding to the protrusion 1-1, and a slot 2-1 is provided on the base 2 at a position corresponding to the pair of clips 1-2. The protrusion 1-1 can be inserted into the through-hole 9-1, and the clip 1-2 can be snapped into the slot 2-1. During installation, the protrusion 1-1 is first aligned with the through-hole 9-1 and inserted, and then the clip 1-2 is inserted into the slot 2-1. The clip 1-2 is inserted into the slot 2-1 to form a detachable connection, making the isolation frame 1 removable and convenient for later repair and maintenance.

[0022] The front side wall of the isolation frame 1 is provided with a pair of ventilation holes 4. Before assembly, the ventilation holes 4 are used for cleaning by blowing air, and then the outer cover 10 is installed to ensure the cleanliness of the interior of the relay.

[0023] Among them, the bottom of the base 2 and a circle close to the contact tail piece 11 are provided with an inner glue channel 2-2, and the bottom of the base 2 and a circle close to the edge are provided with an outer glue channel 2-3. The inner glue channel 2-2 and the outer glue channel 2-3 are glue-filled and connected to the outer cover 10 for sealing, thereby improving the sealing of the relay.

[0024] The isolating frame 1, the arc isolation plate 5 and the stopper 3 are made of dry unsaturated polyester molding compound, which has good insulation, heat resistance and structural stability.

[0025] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic relay contact isolation structure, characterized in that: The invention comprises a relay body (12), a base (2), an outer cover (10) and an isolation frame (1); a plurality of contact pieces (6) are evenly arranged on the base (2); a contact tail piece (11) is arranged at a position corresponding to the contact piece (6) at the bottom of the base (2) and is electrically connected to the contact piece (6); a back plate (9) is fixedly arranged on the rear side of the base (2); the isolation frame (1) is detachably arranged on the base (2) and the back plate (9); at least two arc isolation plates (5) are arranged on the isolation frame (1) and divide the plurality of contact pieces (6) into at least two contact groups (7) in the horizontal direction; the arc isolation plates (5) can block the arcs of adjacent contact groups (7) and the broken contact pieces (6); each contact Blocks (3) are respectively provided on both sides of the contact piece (6) in the middle of the isolation frame (1) and the arc isolation plate (5) in the point group (7); a pair of block blocks (3) cooperate with the contact piece (6) to divide the contact group (7) into at least two contact areas (8) longitudinally; the block blocks (3) can block the broken contact pieces (6) of the adjacent contact areas (8); the relay body (12) is fixedly connected to the base (2) and the back plate (9) and is electrically connected to the contact piece (6); the base (2), the back plate (9) and the relay body (12) are inserted into the outer cover (10) from top to bottom, and the contact tail piece (11) passes through the bottom of the outer cover (10); the top of the outer cover (10) is buckled by a cover plate.

2. The electromagnetic relay contact isolation structure according to claim 1, characterized in that: A protrusion (1-1) is provided at the center of the rear side wall of the isolation frame (1), a pair of snap fasteners (1-2) are provided at the bottom of the front side wall of the isolation frame (1), a through hole (9-1) is provided on the back plate (9) at a position corresponding to the protrusion (1-1), and a card slot (2-1) is provided on the base (2) at a position corresponding to the pair of snap fasteners (1-2), the protrusion (1-1) can be inserted into the through hole (9-1) and the snap fastener (1-2) can be snapped into the card slot (2-1) at the same time.

3. The electromagnetic relay contact isolation structure according to claim 1, characterized in that: A pair of ventilation holes (4) are provided on the front side wall of the isolation frame (1).

4. The electromagnetic relay contact isolation structure according to claim 1, characterized in that: An inner glue path (2-2) is provided at the bottom of the base (2) and in a circle close to the contact tail piece (11), and an outer glue path (2-3) is provided at the bottom of the base (2) and in a circle close to the edge. The inner glue path (2-2) and the outer glue path (2-3) are glue-filled and connected to the outer cover (10) for sealing.

5. The electromagnetic relay contact isolation structure according to claim 1, characterized in that: The isolation frame (1), arc isolation plate (5) and stopper (3) are made of dry unsaturated polyester molding compound.

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