CN116313650A - Electromagnetic relay based on differential impedance principle - Google Patents

Abstract

The invention discloses an electromagnetic relay based on a differential impedance principle, which comprises a shell, wherein a cover plate is arranged at the bottom of the front surface of the shell, a coil power-connecting plate is arranged at the bottom of the shell, a coil power-connecting contact is arranged at the bottom of the coil power-connecting plate, a coil is arranged at the bottom of the shell, and a partition plate is arranged at the top of the shell; a trigger mechanism is arranged between the coil and the partition plate, a differential impedance device is arranged in the middle of the top of the partition plate, a switch power-connecting plate is arranged at the top end of the differential impedance device, two normally open switch contacts are arranged at one side of the top end of the switch power-connecting plate, and two normally closed switch contacts are arranged at the other side of the top end of the switch power-connecting plate; side grooves are formed in two sides of the shell, heat dissipation plates are arranged in the side grooves, and two mounting frames are arranged on the back of the shell. The differential impedance device is arranged between the coil and the switch contact, so that the differential current in the circuit can be detected by utilizing the differential impedance principle, the circuit can be rapidly cut off, and the differential protection of the circuit can be realized.

Description

Electromagnetic relay based on differential impedance principle

Technical Field

The invention relates to the technical field of electromagnetic relays, in particular to an electromagnetic relay based on a differential impedance principle.

Background

An electromagnetic relay is a common power protection device, and the main working principle of the electromagnetic relay is to convert input signal current or voltage into mechanical motion by utilizing the electromagnetic induction principle, so as to realize functions of switch control, signal conversion, protection and the like. Electromagnetic relays are generally composed of a coil, an iron core, contacts and the like, wherein the coil generates a magnetic field through electrifying, so that the iron core is stressed to move, and further the contacts are controlled to be closed or opened. The device has the characteristics of low price, simple structure, reliable use and the like, and is widely applied to various fields.

For example, the electromagnetic relay can be used for overload protection, short-circuit protection, grounding protection and the like of the power system, so that the safe and stable operation of the power system is ensured; the method can be used for signal conversion, transmission, control and other aspects in an automatic control system, and realizes the automatic operation of mechanical equipment; the system can be used for signal control, safety protection, anti-lock and other aspects in the field of transportation, and ensures traffic safety; the method can also be used for controlling, switching, protecting and the like in household appliances, such as washing machines, refrigerators, air conditioners and the like.

The common relay comprises a normally open relay and a normally closed relay, normally open and normally closed protection of the control circuit are respectively realized, and the control circuit is switched on and off by utilizing the action of an electromagnetic coil. However, this type of relay does not have a strong circuit protection function, can perform mode switching only when a signal is received, does not have functions such as current detection and impedance measurement, and requires an additional circuit protection device, i.e., a differential protection type relay, to realize this function.

The existing differential protection relay needs to use a large number of electric components and mechanical parts, so that the volume of the differential protection relay is large, and the differential protection relay is inconvenient to install and maintain; mechanical components, wiring boards, and the like used in the differential protection relay are susceptible to external environments and vibrations, and are susceptible to failures such as wear and loosening. And the differential protection relay can only protect single equipment or circuit, if the protection range needs to be expanded, redesign and installation are needed, such as mode switching of a normally open relay and a normally closed relay, etc. For the problems in the related art, no effective solution has been proposed at present.

Disclosure of Invention

Aiming at the problems in the related art, the invention provides an electromagnetic relay based on the differential impedance principle so as to overcome the technical problems existing in the prior related art.

For this purpose, the invention adopts the following specific technical scheme:

an electromagnetic relay based on the differential impedance principle comprises a shell, wherein a cover plate is arranged at the bottom of the front surface of the shell, a coil electric connection plate is arranged at the bottom end of the shell, a coil electric connection contact is arranged at the bottom end of the coil electric connection plate, a coil is arranged at the bottom in the shell, and a partition plate is arranged at the top in the shell; a trigger mechanism is arranged between the coil and the partition plate, a differential impedance device is arranged in the middle of the top of the partition plate, a switch power-connecting plate is arranged at the top end of the differential impedance device, two normally open switch contacts are arranged at one side of the top end of the switch power-connecting plate, and two normally closed switch contacts are arranged at the other side of the top end of the switch power-connecting plate; side grooves are formed in two sides of the shell, heat dissipation plates are arranged in the side grooves, and two mounting frames are arranged on the back of the shell.

Furthermore, in order to ensure that the coil can be clamped between two U-shaped plates through coil end plates at two ends and is prevented from rotating through anti-rotation blocks, the power supply and differential current monitoring of the coil are respectively realized through coil power-on contacts and coil differential monitoring contacts at two ends, the operation and differential protection of the electromagnetic relay are completed, the coil end plates are arranged at the top end and the bottom end of the coil, two U-shaped plates matched with the coil end plates are arranged on the inner side wall of the shell, the anti-rotation blocks are arranged at two sides of the coil end plates, and anti-rotation clamping grooves matched with the anti-rotation blocks are arranged at two sides of the U-shaped plates; coil energizing contacts and coil differential monitoring contacts are arranged at the top end and the bottom end of the coil end plate.

Further, in order to realize the left-right translation sliding of the two movable plates under the premise that the metal round plate is subjected to coil acting force through the vertical lifting action of the sliding connecting rod, the two trigger plates at the top ends of the movable plates are driven to retract inwards to finish switching of the relay, T-shaped columns are arranged on two sides of the top of the U-shaped plate positioned at the top, coil monitoring wiring holes are formed in the middle position of the partition plate, limiting sliding grooves are formed in two sides of the partition plate, two limiting sliding rails are arranged at the bottoms of two sides of the partition plate, the limiting sliding rails are respectively positioned on the front surface and the back surface of the limiting sliding grooves, the two limiting sliding rails positioned on the same side are axisymmetric with respect to the limiting sliding grooves, the trigger mechanism comprises a sliding connecting rod arranged between the two T-shaped columns, metal sleeves are respectively arranged at two ends of the sliding connecting rod, the metal sleeves are respectively sleeved on the outer sides of the circumference of the T-shaped columns, springs are respectively sleeved at the bottoms of the outer circumferences of the T-shaped columns, the middle positions of the sliding connecting rod are provided with the metal round plate, and fixing seats are respectively arranged on two sides of the top of the sliding connecting rod. A movable plate is arranged between the two limiting sliding rails positioned on the same side, a movable seat is arranged at the bottom end of the movable plate, and a movable connecting rod is arranged between the fixed seat and the movable seat; the movable plates are of T-shaped structures, the tops of the movable plates are positioned in the limiting sliding grooves, the two movable plates are respectively positioned on two sides of the differential impedance device, a normally open trigger plate is arranged at the top of the movable plate on the same side as the normally open switch contact, and a normally closed trigger plate is arranged at the top of the movable plate on the same side as the normally closed switch contact; two normally open movable contacts are arranged at the top of one side of the normally open trigger plate, which is close to the differential impedance device, and an insulating breaking block is arranged at the top of one side of the normally closed trigger plate, which is close to the differential impedance device.

Furthermore, in order to enable the two groups of switch contacts to be arranged at the top end of the shell and clamp the differential impedance device inside, the three are mutually connected, and the differential impedance device has the function effect of differential protection; and the different kinds of electric boxes that connect behind the both sides settlement can realize normally closed relay and normally open relay's function action simultaneously, strengthens relay's practicality and functional, and switch electric plate bottom four corners all is provided with embedded stabilizer blade, and embedded stabilizer blade is located the casing top, and one side that switch electric plate bottom is close to normally open trigger plate is provided with normally open electric box that connects, and one side that switch electric plate bottom is close to normally closed trigger plate is provided with normally closed electric box that connects.

Furthermore, in order to realize the conduction of the two normally open switch contacts through the contact of the normally open movable contact and the normally open fixed contact, namely to realize the power supply of a control circuit, the power receiving box is connected to a differential impedance device, and then the current detection can be carried out in real time after the circuit is connected, so that the function aim of protection is achieved, the safety and stability of the control circuit are further ensured, two normally open fixed contacts matched with the normally open movable contact are arranged on one side of the normally open power receiving box, which is close to a normally open trigger plate, and a switch differential monitoring contact is arranged on one side of the normally open power receiving box, which is close to the differential impedance device; the circuit is broken between the two normally open fixed contacts, the two normally open fixed contacts are respectively and electrically connected with the two normally open switch contacts, the two normally open fixed contacts are electrically connected with the switch differential monitoring contact, and the two normally open movable contacts are electrically connected.

Further, in order to push the normally-closed elastic contact piece out of the contact range of the normally-closed fixed contact piece through the action of the insulating breaking block, thereby realizing the breaking of the control circuit and obtaining the functional effect of the normally-closed relay, a normally-closed connecting cavity is formed in one side of the normally-closed power-on box, which is close to the normally-closed trigger plate, a normally-closed fixed contact piece is arranged at the inner top of the normally-closed connecting cavity, a normally-closed elastic contact piece is arranged at the inner bottom of the normally-closed connecting cavity, and the normally-closed elastic contact piece is positioned at the inner side of the normally-closed fixed contact piece and keeps fit with the insulating breaking block; the normally-closed fixed contact piece and the normally-closed elastic contact piece are respectively and electrically connected with the normally-closed switch contact.

Further, in order to perform differential protection on the normally open relay module, after the normally open relay is switched on, current is continuously monitored, the occurrence of danger of circuit abnormality is avoided, a differential impedance output groove is formed in the top of the front face of the shell, the differential impedance device comprises a monitoring box arranged at the top end of the partition plate, a coil monitoring connection contact matched with a coil monitoring wiring hole is arranged at the bottom end of the monitoring box, an output contact matched with the differential impedance output groove is arranged on the front face of the monitoring box, and a switch monitoring connection contact matched with a switch differential monitoring contact is arranged on one side of the monitoring box; the monitoring box is internally provided with a current transformer, a comparator, an output element, a differential amplifier and a power transformer.

Further, in order to improve the heat radiation capacity of the shell and the components inside the shell, a plurality of side heat radiation holes which are distributed in a rectangular shape and are arranged at equal intervals are formed in the side grooves, and the heat radiation plate is of a hollow structure and is internally provided with heat radiation liquid.

The beneficial effects of the invention are as follows:

1. by arranging the differential impedance device between the coil and the switch contact, the differential current in the circuit can be detected by utilizing the differential impedance principle, and the circuit can be rapidly cut off, so that the differential protection of the circuit is realized; compared with the conventional protection of overcurrent, overvoltage, undervoltage and the like, the differential protection has higher precision and reliability, can rapidly detect faults and realize fault information broadcasting, further cuts off circuits, avoids equipment damage and personal safety accidents, and further better protects the safe and stable operation of a power system.

2. By adopting a modularized structural design, a plurality of components in the shell are clamped and mounted according to preset positions, so that the mounting and production difficulty is effectively reduced, and the differential impedance device has the characteristics of simple structure, small volume, convenience in mounting and the like, is simpler to maintain and maintain, and can reduce the maintenance cost and the maintenance difficulty; the differential impedance protection device with different specifications and monitoring ranges can be configured and replaced for different circuits on the basis of the original shell, the internal differential impedance device can be maintained and replaced only by dismantling the switch power-on plate of the end head, and the circuits are kept on through the fixed contacts, so that the difficulty in replacing components is further reduced, and the defects that the circuit between traditional electrical elements is complex and difficult to disassemble and replace are overcome.

3. Through setting up two sets of electric boxes and switch contact, can switch each through two sets of different trigger plates, possess normally closed circuit breaker and normally open circuit breaker's function promptly simultaneously, can connect corresponding switch contact according to actual demand to effectively improve electromagnetic relay's practicality and functionality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a front structure of an electromagnetic relay based on a differential impedance principle according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a back structure of an electromagnetic relay based on a differential impedance principle according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an internal structure of an electromagnetic relay based on a differential impedance principle according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of an electromagnetic relay based on the principle of differential impedance according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a housing in an electromagnetic relay based on the principle of differential impedance according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a housing structure in an electromagnetic relay based on the principle of differential impedance according to an embodiment of the present invention;

fig. 7 is a schematic view of a partial structure of a housing in an electromagnetic relay based on a differential impedance principle according to an embodiment of the present invention;

fig. 8 is a bottom view of a switch contact plate in an electromagnetic relay based on the principle of differential impedance according to an embodiment of the present invention;

fig. 9 is a top view of a switch-connection plate in an electromagnetic relay based on the principle of differential impedance according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a differential impedance device in an electromagnetic relay based on the principle of differential impedance according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a coil structure in an electromagnetic relay based on a differential impedance principle according to an embodiment of the present invention;

FIG. 12 is an enlarged view of a portion of FIG. 3 at A;

FIG. 13 is an enlarged view of a portion of FIG. 4 at B;

FIG. 14 is an enlarged view of a portion of FIG. 4 at C;

FIG. 15 is a partial enlarged view at D in FIG. 4;

fig. 16 is a partial enlarged view at E in fig. 5.

In the figure:

1. a housing; 2. a cover plate; 3. a coil connecting plate; 4. the coil is connected with an electric contact; 5. a coil; 6. a partition plate; 7. a trigger mechanism; 701. a sliding connecting rod; 702. a metal sleeve; 703. a spring; 704. a metal wafer; 705. a fixing seat; 706. a moving plate; 707. a movable seat; 708. a moving connecting rod; 8. differential impedance means; 801. a monitoring box; 802. the coil monitors the connecting contact; 803. an output contact; 804. the switch monitors the connecting contact; 805. a current transformer; 806. a comparator; 807. an output element; 808. a differential amplifier; 809. a power transformer; 9. the switch is connected with the electric plate; 10. a normally open switch contact; 11. normally closed switch contacts; 12. a side groove; 13. a heat dissipation plate; 14. a mounting frame; 15. a coil end plate; 16. a U-shaped plate; 17. an anti-rotation block; 18. an anti-rotation clamping groove; 19. a coil energizing contact; 20. coil differential monitoring contacts; 21. a T-shaped column; 22. a coil monitoring wiring hole; 23. limiting sliding grooves; 24. a limit sliding rail; 25. a normally open trigger plate; 26. a normally closed trigger plate; 27. a normally open movable contact; 28. an insulating breaker block; 29. the support legs are embedded; 30. a normally open power connection box; 31. normally closed power connection box; 32. a normally open fixed contact; 33. a switch differential monitoring contact; 34. a normally closed connecting cavity; 35. normally closed fixed contact; 36. normally closed elastic contact piece; 37. a differential impedance output slot; 38. side heat dissipation row holes.

Detailed Description

For the purpose of further illustrating the various embodiments, the present invention provides the accompanying drawings, which are a part of the disclosure of the present invention, and which are mainly used to illustrate the embodiments and, together with the description, serve to explain the principles of the embodiments, and with reference to these descriptions, one skilled in the art will recognize other possible implementations and advantages of the present invention, wherein elements are not drawn to scale, and like reference numerals are generally used to designate like elements.

According to an embodiment of the present invention, there is provided an electromagnetic relay based on a differential impedance principle.

The invention will now be further described with reference to the accompanying drawings and the specific embodiments, as shown in fig. 1 to 16, an electromagnetic relay based on the principle of differential impedance according to an embodiment of the invention includes a housing 1, a cover plate 2 is disposed at the bottom of the front surface of the housing 1, a coil power connection plate 3 is disposed at the bottom of the housing 1, a coil power connection contact 4 is disposed at the bottom of the coil power connection plate 3, a coil 5 is disposed at the bottom of the housing 1, and a separator 6 is disposed at the top of the housing 1; a trigger mechanism 7 is arranged between the coil 5 and the partition plate 6, a differential impedance device 8 is arranged in the middle of the top of the partition plate 6, a switch power connection plate 9 is arranged at the top end of the differential impedance device 8, two normally open switch contacts 10 are arranged on one side of the top end of the switch power connection plate 9, and two normally closed switch contacts 11 are arranged on the other side of the top end of the switch power connection plate 9; side grooves 12 are formed in two sides of the shell 1, a heat dissipation plate 13 is arranged in the side grooves 12, and two mounting frames 14 are arranged at the back of the shell 1.

By means of the technical scheme, the differential impedance device 8 is arranged between the coil 5 and the switch contact, so that the differential current in the circuit can be detected by utilizing the differential impedance principle, the rapid circuit cutting-off action can be performed, and the differential protection of the circuit can be realized; compared with the conventional protection of overcurrent, overvoltage, undervoltage and the like, the differential protection has higher precision and reliability, can rapidly detect faults and realize fault information broadcasting, further cuts off circuits, avoids equipment damage and personal safety accidents, and further better protects the safe and stable operation of a power system. Through adopting modularized structural design, a plurality of components and parts in casing 1 carry out the joint installation according to predetermineeing the position, effectively reduce the installation production degree of difficulty, and differential impedance device has simple structure, small, simple to operate's characteristics such as installation, and its maintenance and maintenance are also simpler, can reduce maintenance cost and maintenance degree of difficulty.

In one embodiment, for the coil 5, coil end plates 15 are disposed at the top and bottom ends of the coil 5, two U-shaped plates 16 matched with the coil end plates 15 are disposed on the inner side wall of the housing 1, anti-rotation blocks 17 are disposed on both sides of the coil end plates 15, and anti-rotation clamping grooves 18 matched with the anti-rotation blocks 17 are disposed on both sides of the U-shaped plates 16; the coil end plates 15 are provided with coil energizing contacts 19 and coil differential monitoring contacts 20 at the top and bottom ends, so that the coil 5 can be fixedly clamped between the two U-shaped plates 16 through the coil end plates 15 at the two ends, rotation is avoided through the anti-rotation block 17, and the coil energizing contacts 19 and the coil differential monitoring contacts 20 at the two ends respectively realize power supply and differential current monitoring of the coil 5, and complete operation and differential protection of the electromagnetic relay.

The coil energizing contacts 19 at two ends of the coil end plate 15 are respectively electrically connected with the two coil electrical contacts 4, namely, the two contacts are connected by using a wire and welded, so that when the coil electrical contacts 4 obtain the power supply voltage, the coil 5 can form a loop to generate electromagnetic force to perform electromagnetic action on the trigger mechanism 7, and the switching of the relay is realized.

In one embodiment, for the U-shaped board 16, T-shaped columns 21 are respectively arranged at two sides of the top of the U-shaped board 16, coil monitoring wiring holes 22 are formed in the middle of the partition board 6, limiting sliding grooves 23 are respectively arranged at two sides of the partition board 6, two limiting sliding rails 24 are respectively arranged at the bottoms of two sides of the partition board 6, the limiting sliding rails 24 are respectively positioned at the front and the back of the limiting sliding grooves 23, the two limiting sliding rails 24 positioned at the same side are axisymmetric with respect to the limiting sliding grooves 23, the triggering mechanism 7 comprises a sliding connecting rod 701 arranged between the two T-shaped columns 21, metal sleeves 702 are respectively arranged at two ends of the sliding connecting rod 701, the metal sleeves 702 are respectively sleeved at the outer sides of the circumferences of the T-shaped columns 21, springs 703 are respectively sleeved at the bottoms of the circumferences of the T-shaped columns 21, metal discs 704 are respectively arranged in the middle of the sliding connecting rod 701, and fixing seats 705 are respectively arranged at two sides of the top of the sliding connecting rod 701; a movable plate 706 is arranged between the two limiting slide rails 24 positioned on the same side, a movable seat 707 is arranged at the bottom end of the movable plate 706, and a movable connecting rod 708 is arranged between the fixed seat 705 and the movable seat 707; the movable plates 706 are of T-shaped structures, the tops of the movable plates 706 are positioned in the limiting sliding grooves 23, the two movable plates 706 are respectively positioned at two sides of the differential impedance device 8, a normally open trigger plate 25 is arranged at the top of the movable plate 706 at the same side as the normally open switch contact 10, and a normally closed trigger plate 26 is arranged at the top of the movable plate 706 at the same side as the normally closed switch contact 11; two normally open movable contacts 27 are arranged at the top of one side of the normally open trigger plate 25, which is close to the differential impedance device 8, and an insulating breaking block 28 is arranged at the top of one side of the normally closed trigger plate 26, which is close to the differential impedance device 8, so that on the premise that the metal disc 704 is acted by the coil 5, the left-right translation and sliding of the two movable plates 706 can be realized through the vertical lifting action of the sliding connecting rod 701, and the two trigger plates at the top ends of the movable plates 706 are driven to retract inwards, so that the switching of a relay is completed.

The specific working principle of the triggering mechanism 7 is as follows: after the coil 5 is powered, magnetic force is generated to attract the metal disc 704 and the metal sleeves 702 at the two ends of the metal disc to move downwards, namely, the sliding connecting rod 701 is driven to move downwards, then the bottom end of the moving connecting rod 708 is contracted inwards, the top end of the moving connecting rod 708 is contracted inwards due to the fact that the length of the moving connecting rod is unchanged, namely, the moving plates 706 are driven to slide inwards, and the moving plates 706 at the two sides finally drive the trigger plates at the top ends of the moving plates to move. After the coil 5 stops being powered off, the sliding connecting rod 701 returns to the original position under the action of the spring 703, and the two trigger plates also return to the original position, so that the unpowered state is maintained.

In one embodiment, for the switch power-receiving plate 9, four corners at the bottom of the switch power-receiving plate 9 are provided with embedded supporting legs 29, the embedded supporting legs 29 are positioned at the inner top of the shell 1, one side, close to the normally open trigger plate 25, of the bottom of the switch power-receiving plate 9 is provided with a normally open power-receiving box 30, and one side, close to the normally closed trigger plate 26, of the bottom of the switch power-receiving plate 9 is provided with a normally closed power-receiving box 31, so that two groups of switch contacts can be arranged at the top end of the shell 1, and the differential impedance device is clamped inside, so that the mutual connection of the three is realized, and the function effect of differential protection is achieved; and the two sides are provided with different kinds of power connection boxes, so that the function of the normally closed relay and the normally open relay can be realized at the same time, and the practicability and the functionality of the relay are enhanced.

In one embodiment, for the normally open electric box 30, two normally open fixed contacts 32 matched with the normally open movable contact 27 are arranged on one side of the normally open electric box 30 close to the normally open trigger plate 25, and a switch differential monitoring contact 33 is arranged on one side of the normally open electric box 30 close to the differential impedance device 8; the circuit is broken between the two normally open fixed contacts 32, the two normally open fixed contacts 32 are respectively electrically connected with the two normally open switch contacts 10, the two normally open fixed contacts 32 are electrically connected with the switch differential monitoring contact 33, and the two normally open movable contacts 27 are electrically connected, so that the two normally open switch contacts 10 can be conducted through the contact between the normally open movable contact 27 and the normally open fixed contacts 32, the power supply of a control circuit is realized, meanwhile, the power connection box is connected to the differential impedance device 8, the current detection can be carried out in real time after the circuit is connected, the protection function purpose is achieved, and the safety and stability of the control circuit are further ensured.

In one embodiment, for the normally-closed power-on box 31, a normally-closed connection cavity 34 is formed on one side of the normally-closed power-on box 31, which is close to the normally-closed trigger plate 26, a normally-closed fixed contact piece 35 is arranged at the inner top of the normally-closed connection cavity 34, a normally-closed elastic contact piece 36 is arranged at the inner bottom of the normally-closed connection cavity 34, and the normally-closed elastic contact piece 36 is positioned at the inner side of the normally-closed fixed contact piece 35 and keeps matching with the insulation breaking block 28; the normally-closed fixed contact piece 35 and the normally-closed elastic contact piece 36 are respectively and electrically connected with the normally-closed switch contact 11, so that the normally-closed elastic contact piece 36 can be pushed out of the contact range of the normally-closed fixed contact piece 35 through the action of the insulating breaking block 28, thereby realizing the breaking of a control circuit and obtaining the functional effect of the normally-closed relay.

The normally closed elastic contact 36 has elasticity, and after the coil 5 is electrified, the normally closed trigger plate 26 moves towards the normally closed elastic contact 36, and the normally closed elastic contact 36 is deformed inwards by the contact of the insulating breaking block 28, so that the normally closed elastic contact is separated from the contact of the normally closed fixed contact 35, and the purpose of breaking is achieved.

In one embodiment, for the above-mentioned housing 1, the top of the front surface of the housing 1 is provided with the differential impedance output slot 37, the differential impedance device 8 includes a monitoring box 801 disposed at the top end of the partition board 6, a coil monitoring connection contact 802 matched with the coil monitoring wiring hole 22 is disposed at the bottom end of the monitoring box 801, an output contact 803 matched with the differential impedance output slot 37 is disposed on the front surface of the monitoring box 801, and a switch monitoring connection contact 804 matched with the switch differential monitoring contact 33 is disposed at one side of the monitoring box 801; the monitoring box 801 is internally provided with a current transformer 805, a comparator 806, an output element 807, a differential amplifier 808 and a power transformer 809, so that the normally open relay module can be differentially protected, and after the normally open relay is turned on, current is continuously monitored, and the occurrence of danger of circuit abnormality is avoided.

The current transformer 805 is used for measuring the current entering the normally open relay and the current leaving the normally open relay, the power transformer 809 is used for converting the current into a proper signal, the differential amplifier 808 is used for comparing the two signals and outputting a differential signal, the comparator 806 is used for converting the differential signal into differential impedance, the output element 807 is used for judging whether the differential impedance exceeds a preset value, if the differential impedance exceeds the preset value, the protection signal is triggered, the action of the relay is controlled, and the output contact 803 realizes the independent power supply of the differential impedance device 8 and the output of an alarm signal, so that the early warning purpose is further achieved.

In one embodiment, for the side slot 12, a plurality of side heat dissipation holes 38 are formed in the side slot 12, and the side heat dissipation holes are arranged at equal intervals and are distributed in a rectangular shape, and the heat dissipation plate 13 is of a hollow structure and is internally provided with heat dissipation liquid, so as to improve the heat dissipation capability of the housing 1 and the components therein.

In order to facilitate understanding of the above technical solutions of the present invention, the following describes in detail the working principle or operation manner of the present invention in the actual process.

When in practical application, the device is arranged in a device or a circuit, the normally open switch contact 10 or the normally closed switch contact 11 is selectively connected according to the requirement, the circuit to be controlled is connected, and if the two normally open switch contacts 10 are selectively connected, the normally open relay function is specifically realized. After the coil 5 is independently powered, the coil 5 is connected to generate magnetic force, the movement of the normally open trigger plate 25 is realized according to the working principle of the trigger mechanism 7, the connection of the two normally open switch contacts 10 is finally realized, the two normally open switch contacts are synchronously connected with the differential impedance device 8, the currents at the two ends, namely the current of the coil 5 and the current at the ends of the normally open switch contacts 10 are acquired and analyzed and compared in real time, if the difference value between the current and the current is greater than a preset threshold value, early warning reminding is generated, the power supply of the coil 5 is automatically stopped, and the control circuit is disconnected, so that the circuit protection is achieved.

In summary, by means of the above technical solution of the present invention, by providing the differential impedance device 8 between the coil 5 and the switch contact, the differential current in the circuit can be detected by using the differential impedance principle, and the rapid circuit breaking action can be performed, thereby realizing the differential protection of the circuit; compared with the conventional protection of overcurrent, overvoltage, undervoltage and the like, the differential protection has higher precision and reliability, can rapidly detect faults and realize fault information broadcasting, further cuts off circuits, avoids equipment damage and personal safety accidents, and further better protects the safe and stable operation of a power system. Through adopting modularized structural design, a plurality of components and parts in casing 1 carry out the joint installation according to predetermineeing the position, effectively reduce the installation production degree of difficulty, and differential impedance device has simple structure, small, characteristics such as simple to operate, its maintenance and maintenance are also fairly simple, maintenance cost and maintenance degree of difficulty can be reduced, can be on original casing's basis, to different circuits, dispose the differential impedance protection device of changing different specifications and monitoring range, only need demolish the switch of end and meet the electric plate can maintain the change to inside differential impedance device, and keep switching on through fixed contact between each circuit, further reduce the component and change the degree of difficulty, avoid the circuit complicacy between the traditional electrical component, the defect of difficult dismantlement change. Through setting up two sets of electric boxes and switch contact, can switch each through two sets of different trigger plates, possess normally closed circuit breaker and normally open circuit breaker's function promptly simultaneously, can connect corresponding switch contact according to actual demand to effectively improve electromagnetic relay's practicality and functionality.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (7)

1. The electromagnetic relay based on the differential impedance principle comprises a shell (1), wherein a cover plate (2) is arranged at the bottom of the front surface of the shell (1), and is characterized in that a coil electric connection plate (3) is arranged at the bottom end of the shell (1), a coil electric connection contact (4) is arranged at the bottom end of the coil electric connection plate (3), a coil (5) is arranged at the inner bottom of the shell (1), and a partition plate (6) is arranged at the inner top of the shell (1);

a trigger mechanism (7) is arranged between the coil (5) and the partition board (6), a differential impedance device (8) is arranged at the middle position of the top of the partition board (6), a switch electric connection board (9) is arranged at the top end of the differential impedance device (8), two normally open switch contacts (10) are arranged at one side of the top end of the switch electric connection board (9), and two normally closed switch contacts (11) are arranged at the other side of the top end of the switch electric connection board (9);

side grooves (12) are formed in two sides of the shell (1), a heat dissipation plate (13) is arranged in the side grooves (12), and two mounting frames (14) are arranged on the back of the shell (1);

coil end plates (15) are arranged at the top end and the bottom end of the coil (5), two U-shaped plates (16) matched with the coil end plates (15) are arranged on the inner side wall of the shell (1), anti-rotation blocks (17) are arranged on two sides of the coil end plates (15), and anti-rotation clamping grooves (18) matched with the anti-rotation blocks (17) are formed in two sides of the U-shaped plates (16);

coil energizing contacts (19) and coil differential monitoring contacts (20) are arranged at the top end and the bottom end of the coil end plate (15);

the coil monitoring wiring holes (22) are formed in the middle of the partition plate (6), limiting sliding grooves (23) are formed in the two sides of the partition plate (6), two limiting sliding rails (24) are arranged at the bottoms of the two sides of the partition plate (6), the limiting sliding rails (24) are respectively arranged on the front surface and the back surface of the limiting sliding grooves (23), and the two limiting sliding rails (24) on the same side are axisymmetric with respect to the limiting sliding grooves (23);

the trigger mechanism (7) comprises a sliding connecting rod (701) arranged between two T-shaped columns (21), metal sleeves (702) are arranged at two ends of the sliding connecting rod (701), the metal sleeves (702) are sleeved on the outer sides of the circumferences of the T-shaped columns (21), springs (703) are sleeved on the bottoms of the outer sides of the circumferences of the T-shaped columns (21), metal discs (704) are arranged in the middle of the sliding connecting rod (701), and fixing seats (705) are arranged at two sides of the top of the sliding connecting rod (701);

a movable plate (706) is arranged between the two limiting slide rails (24) positioned on the same side, a movable seat (707) is arranged at the bottom end of the movable plate (706), and a movable connecting rod (708) is arranged between the fixed seat (705) and the movable seat (707);

the moving plate (706) is of a T-shaped structure, and the top of the moving plate is located inside the limiting chute (23).

2. The electromagnetic relay based on the differential impedance principle according to claim 1, wherein two moving plates (706) are respectively located at two sides of the differential impedance device (8), a normally open trigger plate (25) is arranged at the top of the moving plate (706) at the same side as the normally open switch contact (10), and a normally closed trigger plate (26) is arranged at the top of the moving plate (706) at the same side as the normally closed switch contact (11);

two normally open movable contacts (27) are arranged at the top of one side of the normally open trigger plate (25) close to the differential impedance device (8), and an insulating breaking block (28) is arranged at the top of one side of the normally closed trigger plate (26) close to the differential impedance device (8).

3. The electromagnetic relay based on the differential impedance principle according to claim 2, wherein embedded supporting legs (29) are arranged at four corners of the bottom of the switch power connection plate (9), the embedded supporting legs (29) are located at the inner top of the shell (1), a normally open power connection box (30) is arranged at one side, close to the normally open trigger plate (25), of the bottom of the switch power connection plate (9), and a normally closed power connection box (31) is arranged at one side, close to the normally closed trigger plate (26), of the bottom of the switch power connection plate (9).

4. An electromagnetic relay based on the principle of differential impedance according to claim 3, characterized in that two normally open fixed contacts (32) matching with the normally open movable contacts (27) are arranged on the side of the normally open electrical connection box (30) close to the normally open trigger plate (25), and a switch differential monitoring contact (33) is arranged on the side of the normally open electrical connection box (30) close to the differential impedance device (8);

the circuit is kept between the two normally open fixed contacts (32), the two normally open fixed contacts (32) are respectively and electrically connected with the two normally open switch contacts (10), the two normally open fixed contacts (32) are electrically connected with the switch differential monitoring contact (33), and the two normally open movable contacts (27) are electrically connected.

5. The electromagnetic relay based on the differential impedance principle according to claim 4, wherein a normally closed connection cavity (34) is formed on one side of the normally closed power connection box (31) close to the normally closed trigger plate (26), a normally closed fixed contact piece (35) is arranged at the inner top of the normally closed connection cavity (34), a normally closed elastic contact piece (36) is arranged at the inner bottom of the normally closed connection cavity (34), and the normally closed elastic contact piece (36) is positioned at the inner side of the normally closed fixed contact piece (35) and keeps matching with the insulation breaking block (28);

the normally-closed fixed contact piece (35) and the normally-closed elastic contact piece (36) are respectively and electrically connected with the normally-closed switch contact (11).

6. The electromagnetic relay based on the differential impedance principle according to claim 4, wherein a differential impedance output groove (37) is formed in the top of the front surface of the housing (1), the differential impedance device (8) comprises a monitoring box (801) arranged at the top end of the partition board (6), a coil monitoring connection contact (802) matched with the coil monitoring wiring hole (22) is arranged at the bottom end of the monitoring box (801), an output contact (803) matched with the differential impedance output groove (37) is arranged in the front surface of the monitoring box (801), and a switch monitoring connection contact (804) matched with the switch differential monitoring contact (33) is arranged at one side of the monitoring box (801);

a current transformer (805), a comparator (806), an output element (807), a differential amplifier (808) and a power transformer (809) are arranged in the monitoring box (801);

the current transformer (805) is used for measuring the current entering the normally open relay and the current leaving the normally open relay, the ratio transformer (809) is used for converting the current into a proper signal, the differential amplifier (808) is used for comparing the two signals and outputting a differential signal, the comparator (806) is used for converting the differential signal into a differential impedance, the output element (807) is used for judging whether the differential impedance exceeds a preset value or not, if the differential impedance exceeds the preset value, the protection signal is triggered, the action of the relay is controlled, and the output contact (803) is used for realizing the independent power supply of the differential impedance device (8) and the output of an alarm signal.

7. The electromagnetic relay based on the differential impedance principle according to claim 1, wherein a plurality of side heat dissipation row holes (38) which are arrayed at equal intervals and distributed in a rectangular shape are formed in the side grooves (12), and the heat dissipation plate (13) is of a hollow structure and is internally provided with heat dissipation liquid.

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