A high capacity relay with reliable auxiliary contacts

Abstract

The invention relates to the technical field of relays, and discloses a high-capacity relay with reliable auxiliary contacts, comprising a shell with an incoming static contact and an outgoing static contact arranged on the top and a magnetic conductive block arranged on the bottom, a push rod assembly consisting of a moving contact accommodated in the shell and a push rod elastically connected to the moving contact, a sealing tube connected to the magnetic conductive block and having an inner cavity accommodating a moving iron core connected to the push rod, a monitoring chamber formed between a bottom plate at the end of the sealing tube and the moving iron core; and an auxiliary contact assembly penetrating the bottom plate and comprising at least one group of lead-out rods, each group of lead-out rods comprising m lead-out rods, m being 2 or 3, when m=2, an auxiliary static spring sheet and an auxiliary dynamic spring sheet are respectively arranged on each group of lead-out rods; when m=3, an auxiliary dynamic spring sheet is arranged on the middle lead-out rod in each group of lead-out rods, and auxiliary static spring sheets are respectively arranged on the other two lead-out rods; the moving iron core pushes the push rod assembly to move to switch on and off the incoming static contact and the outgoing static contact, and squeezes or releases the auxiliary dynamic spring sheet to switch on and off the auxiliary contact assembly.

Description

Technical Field

[0001] The invention relates to the technical field of relays, in particular to a high-capacity relay with reliable auxiliary contacts isolated from a main circuit. Background Art

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirements. It is composed of an interactive control system (also known as an input circuit) and a controlled system (also known as an output circuit), and plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. With the rise of green energy, high-capacity relays are widely used in high-voltage DC loads such as automotive, photovoltaic, and charging piles. In view of the above-mentioned application scenarios of high-voltage DC loads, auxiliary contacts are often required to monitor the status of the main contacts and perform low-voltage linkage control to improve the safety and reliability of electrical equipment.

[0003] However, since the load voltage of high-capacity relays in new energy vehicles, photovoltaics, industrial control and other fields is relatively high, based on factors such as safety and reliability, relays often adopt a ceramic sealing structure. The setting of the ceramic sealing structure increases the difficulty of installing the auxiliary contacts, which reduces the performance of the relay. For example, the Chinese invention patent with application number CN202010366809.1 discloses a high-voltage DC relay with auxiliary contacts, which adds a group of normally open auxiliary contacts on the top of the ceramic cavity. Its structure is relatively simple, but because the main contacts and auxiliary contacts are distributed on the top of the ceramic at the same time, the isolation effect of high and low loads is poor; when the main contact disconnects the load, the arc can easily run to the auxiliary contact, causing the high and low loads to be connected, or even burning the auxiliary contact, posing a safety hazard; the metal particles splashed by the main contact can easily contaminate the auxiliary contact, and the reliability of the auxiliary contact cannot be guaranteed; the switching logic of the auxiliary contact of this structure is single, and it is synchronously turned on and off with the main contact, making it difficult to achieve action under the opposite logic; the auxiliary contact of this structure is single in form, and is only a normally open structure, which is difficult to meet the relay's demand for normally closed auxiliary contacts; the auxiliary contacts are large in size, and usually only one group can be set at the top of the ceramic cavity. When multiple groups of auxiliary contacts need to be set, the volume of the relay structure increases, the structure is complex, the cost increases, and the reliability decreases simultaneously, which is not conducive to improving the market competitiveness of the product. Summary of the invention

[0004] Based on this, it is necessary to provide a high-capacity relay with reliable auxiliary contacts isolated from the main circuit to address the shortcomings of traditional high-capacity relays.

[0005] A high capacity relay with reliable auxiliary contacts, the high capacity relay comprising:

[0006] A housing, wherein a static contact for incoming wires and a static contact for outgoing wires are provided on the top of the housing, wherein the static contact for incoming wires is used to receive current from an external power supply device, and the static contact for outgoing wires is used to transmit current to an external electrical device, and a magnetic conductive block is provided on the bottom of the housing;

[0007] A push rod assembly, comprising a push rod and a moving contact elastically connected to the push rod, wherein the moving contact is accommodated in the inner cavity of the housing and can move relative to the inner wall of the housing along the height direction of the housing to switch on and off the incoming static contact and the outgoing static contact;

[0008] A sealing tube, the top end of which is connected to the magnetic conductive block, a moving iron core is housed in the sealing tube, the moving iron core is connected to the push rod, a bottom plate for sealing the sealing tube is provided at the end of the sealing tube, and a monitoring chamber is formed between the bottom plate and the moving iron core; and

[0009] An auxiliary contact assembly, comprising at least one group of lead-out rods passing through the bottom plate and connected to the bottom plate, each group of the lead-out rods comprising m lead-out rods, m being 2 or 3, when m=2, one of the lead-out rods in each group of the lead-out rods is provided with an auxiliary static spring at one end located in the monitoring chamber, and another lead-out rod in each group of the lead-out rods is provided with an auxiliary dynamic spring cooperating with the auxiliary static spring at one end located in the monitoring chamber; when m=3, an auxiliary dynamic spring is provided on the middle lead-out rod in each group of the lead-out rods at one end located in the monitoring chamber, and auxiliary static springs cooperating with the auxiliary dynamic spring are respectively provided on the other two lead-out rods in each group of the lead-out rods at one end located in the monitoring chamber;

[0010] When the moving iron core moves in the sealing tube, it drives the push rod assembly to move to connect and disconnect the incoming static contact and the outgoing static contact, and squeezes or releases the auxiliary moving spring to connect and disconnect the auxiliary moving spring and the auxiliary static spring.

[0011] In one embodiment, when m=2, the auxiliary static spring piece and the auxiliary dynamic spring piece are in a normally open or normally closed cooperation.

[0012] In one of the embodiments, the connection between the lead-out rod and the base plate is fixed by glass sintering.

[0013] In one of the embodiments, a ceramic block is disposed on the bottom plate, and the connection between the lead-out rod and the bottom plate is fixed by ceramic brazing.

[0014] In one of the embodiments, a transition piece is respectively arranged between the ceramic block and the lead-out rod and between the ceramic block and the bottom plate and fixed by high-temperature brazing. The material of the transition piece is pure copper or Kovar alloy.

[0015] In one of the embodiments, the base plate and the sealing tube are sealed and connected by laser welding or resistance welding.

[0016] In one of the embodiments, the contact portion between the auxiliary moving spring piece and the auxiliary static spring piece is a pair of mutually matching protrusions or riveted contact pieces or contact points.

[0017] In one of the embodiments, the shell includes a ceramic cover and a transition block connected to an opening portion of the ceramic cover by high-temperature brazing, and the magnetic conductive block is installed at the bottom of the outer surface of the transition block.

[0018] The high-capacity relay with reliable auxiliary contacts of the present invention is implemented, and the incoming static contact and the outgoing static contact, that is, the main contact, are arranged on the top of the shell, and the auxiliary contact assembly is arranged on a bottom plate arranged away from the top of the shell, and a magnetic conductive block is arranged at the bottom of the shell to isolate the high and low voltage loads, thereby increasing the distance between the main contact and the auxiliary contact assembly, thereby increasing the creepage distance and the air distance, and improving the isolation effect of high and low loads; the main contact and the auxiliary contact assembly do not affect each other, avoiding the influence or damage of the arc generated by the main contact during operation on the auxiliary contact assembly, improving the safety and reliability of the relay and extending the service life of the relay; by arranging one group or more of the lead-out rods and the auxiliary contacts installed on the lead-out rods, the number and matching method of the auxiliary contacts can be selected according to the needs of the user to meet the use needs; in addition, the auxiliary contact assembly is arranged on the bottom plate at the end of the sealing tube, occupies a small area, and does not increase the volume of the product, thereby improving the adaptability of the relay size to general electrical equipment, and its structure is simple, which is conducive to improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a high-capacity relay in one embodiment of the present invention;

[0020] Figure 2 for Figure 1 A schematic cross-sectional view of the high-capacity relay in the illustrated embodiment;

[0021] Figure 3 for Figure 1 A schematic diagram of the exploded structure of the high capacity relay in the illustrated embodiment;

[0022] Figure 4 A diagram showing the matching relationship between the lead-out rod and the bottom plate in one embodiment of the present invention;

[0023] Figure 5 This is a diagram of the matching relationship between the lead-out rod and the base plate in another embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] Please also read Figures 1 to 3 The present invention provides a high-capacity relay 10 with a reliable auxiliary contact isolated from a main circuit, the high-capacity relay 10 comprising a housing 100 with an incoming static contact 110 and an outgoing static contact 120 penetrated through the top and a magnetic conductive block 130 disposed at the bottom; a push rod assembly 200 composed of a moving contact 210 accommodated in an inner cavity of the housing 100 and movable relative to the inner wall of the housing 100 along the height direction of the housing 100 to switch on and off the incoming static contact 110 and the outgoing static contact 120, and a push rod 220 elastically connected to the moving contact 210 to push the moving contact 210 to move; a sealing tube 400 with a top end connected to the magnetic conductive block 130 and an inner cavity accommodating a moving iron core 300 connected to the push rod 220, a bottom plate 500 for blocking the sealing tube 400 disposed at the end of the sealing tube 400, a monitoring chamber 600 formed between the bottom plate 500 and the moving iron core 300; and an auxiliary contact assembly 700, comprising a housing 100 with an incoming static contact 110 and an outgoing static contact 120 penetrated through the top and a magnetic conductive block 130 disposed at the bottom, and a monitoring chamber 600 formed between the bottom plate 500 and the moving iron core 300; and The plate 500 is provided with at least one group of lead-out rods 710 connected to the bottom plate 500, each group of lead-out rods 710 includes m lead-out rods 710, m is 2 or 3, when m=2, one lead-out rod 710 in each group of lead-out rods 710 is provided with an auxiliary static spring piece 720 at one end of the monitoring chamber 600, and another lead-out rod 710 in each group of lead-out rods 710 is provided with an auxiliary static spring piece 720 at one end of the monitoring chamber 600. When m=3, the middle lead-out rod 710 in each group of lead-out rods 710 is provided with an auxiliary moving spring 730 at one end of the monitoring chamber 600, and the other two lead-out rods 710 in each group of lead-out rods 710 are provided with auxiliary static springs 720 cooperating with the auxiliary moving spring 730 at one end of the monitoring chamber 600. It can be understood that when m=3, the auxiliary contact assembly 700 includes at least one group of conversion type auxiliary contacts. It should be noted that the height direction of the housing 100 in this embodiment is from the top of the housing 100 to the bottom of the housing 100, and other embodiments can refer to this explanation.

[0026] The housing 100 is used to isolate the arc generated when the incoming static contact 110 and the outgoing static contact 120 are connected via the moving contact 210 from the external environment, so as to improve the safety of the relay. In one embodiment, the housing 100 includes a ceramic cover 140 and a transition block 150 connected to the opening of the ceramic cover 140 by high-temperature brazing. Of course, the housing 100 can also be an integrally formed structure. The ceramic cover 140 is used to block the metal splashes generated by the arc from burning the inner surface of the housing 100, so as to further improve the safety of the relay.

[0027] The incoming static contact 110 and the outgoing static contact 120 are the main contacts of the high-capacity relay 10 of this embodiment, wherein the incoming static contact 110 is used to connect current from an external power supply device, and the outgoing static contact 120 is used to transmit current to external electrical equipment. It can also be understood that the incoming static contact 110 and the outgoing static contact 120 can be regarded as the wires of the two poles of the relay respectively, and the two are used together to connect the relay with the external power supply and the load circuit, so as to facilitate the relay to connect or disconnect the circuit.

[0028] The magnetic block 130 is made of ferromagnetic material and is used to isolate the auxiliary contact assembly 700 from the incoming static contact 110 and the outgoing static contact 120. Specifically, during the operation of the relay, high voltage is applied to the incoming static contact 110 and the outgoing static contact 120, which are the high-voltage end, and the auxiliary contact assembly 700 is the low-voltage end. That is, the magnetic block 130 separates the high-voltage end and the low-voltage end, thereby preventing the arc generated when the moving contact 210 is connected to the incoming static contact 110 and the outgoing static contact 120 from flowing to the auxiliary contact assembly 700, so as to improve the safety of the relay and ensure the reliability of status monitoring through the auxiliary contact assembly 700.

[0029] The bottom plate 500 is used to seal the monitoring chamber 600 to ensure the reliability of the auxiliary contact assembly 700 for the relay status monitoring operation. In one embodiment, the bottom plate 500 is sealed and connected to the sealing tube 400 by laser welding or resistance welding. Specifically, in actual application, the inner cavity of the housing 100 is filled with gas, and the laser welding or resistance welding sealing connection method ensures the sealing of the housing 100 to avoid the occurrence of gas leakage problems.

[0030] The lead-out rod 710 is used to be electrically connected to an external electrical device or control device to send the internal state information of the relay to the external electrical device or control device for monitoring and analysis, so as to grasp the state parameters of the relay. Figure 4 In one embodiment, the connection between the lead-out rod 710 and the base plate 500 is fixed by glass sintering. After glass sintering, the gap between each lead-out rod 710 and the base plate 500 is filled with glass body 740, thereby achieving the purpose of improving the connection strength between the lead-out rod 710 and the base plate 500 and improving the air tightness of the monitoring chamber 600.

[0031] See also Figure 5 In another embodiment, a ceramic block 750 is provided on one side of the base plate 500, and the connection between the lead-out rod 710 and the base plate 500 is fixed by ceramic brazing. The ceramic block 750 can be arranged on the top of the base plate 500 or on the bottom of the base plate 500, and is selected according to the size of the monitoring chamber 600. Further, in one embodiment, a transition piece is respectively arranged between the ceramic block 750 and the lead-out rod 710 and between the ceramic block 750 and the base plate 500 and fixed by high-temperature brazing, and the material of the transition piece is pure copper or Kovar alloy (i.e., iron-nickel-cobalt alloy). By arranging a transition piece made of pure copper or Kovar alloy on the mating surface between the ceramic block 750 and the lead-out rod 710 and the mating surface between the ceramic block 750 and the base plate 500, high-temperature brazing is performed to achieve the purpose of improving the connection quality and sealing quality.

[0032] The auxiliary moving spring 730 is used to connect or disconnect with the auxiliary static spring 720 under the action of the moving iron core 300 to change the potential value output to the external electrical device, so that the operator can judge the working state of the relay according to the potential value of the external electrical device. In one embodiment, the contact portion of the auxiliary moving spring 730 and the auxiliary static spring 720 is a pair of mutually matched protrusions or riveted contacts or contacts. Of course, the connection part of the auxiliary moving spring 730 and the auxiliary static spring 720 can also adopt other matching forms to facilitate the connection and disconnection of the auxiliary moving spring 730 and the auxiliary static spring 720, which will not be repeated here.

[0033] In one embodiment, when m=2, the auxiliary contact assembly 700 includes auxiliary contact units formed by assembling multiple pairs of auxiliary static springs 720 and auxiliary dynamic springs 730. The auxiliary static springs 720 and auxiliary dynamic springs 730 of each auxiliary contact unit can be designed as a normally open structure or a normally closed structure, that is, the auxiliary static springs 720 and the auxiliary dynamic springs 730 are normally open or normally closed. In actual design, the assembly relationship of the auxiliary contact assembly 700 can be combined according to the use scenario of the relay. For example, when the auxiliary contact assembly 700 includes two groups of auxiliary contact units, they can be two groups of normally open auxiliary contact units, two groups of normally closed auxiliary contact units, two groups of conversion auxiliary contact units, and any combination of the three auxiliary contact units, which will not be described in detail here.

[0034] The monitoring principle of the relay status by the auxiliary contact assembly 700 of the present invention is as follows: when the moving iron core 300 moves in the sealing tube 400, it will drive the push rod assembly 200 to move to connect and disconnect the incoming static contact 110 and the outgoing static contact 120, and squeeze or release the auxiliary moving spring 730 to connect and disconnect the auxiliary moving spring 730 and the auxiliary static spring 720. Here, m=2 is used as an example, and the auxiliary static spring piece 720 and the auxiliary moving spring piece 730 are a normally closed matching structure. Specifically, when the moving iron core 300 is not energized, it is pressed toward the auxiliary moving spring piece 730 under the action of gravity, so that the auxiliary moving spring piece 730 and the auxiliary static spring piece 720 are closed. When the moving iron core 300 is energized, the moving iron core 300 moves to the top of the shell 100. During this process, the moving iron core 300 leaves the auxiliary moving spring piece 730, so that the auxiliary moving spring piece 730 and the auxiliary static spring piece 720 are separated. At the same time, the moving iron core 300 pushes the push rod 220, and then pushes the moving contact 210 to connect with the incoming static contact 110 and the outgoing static contact 120 respectively to conduct current. In this way, when the electrical equipment connected to a group of lead-out rods 710 of the auxiliary contact assembly 700 does not detect an electrical signal or the electrical signal suddenly changes to zero, it can be judged that the relay is in the on state. On the contrary, when the auxiliary static reed 720 and the auxiliary dynamic reed 730 are in a normally open matching structure, the monitoring logic of the relay is reversed, that is, when the electrical signal monitored by the external electrical device suddenly changes to zero, it can be determined that the relay is in the disconnected state.

[0035] The high-capacity relay 10 with reliable auxiliary contacts of the present invention is implemented, the incoming static contact 110 and the outgoing static contact 120, that is, the main contact is arranged at the top of the housing 100, the auxiliary contact assembly 700 is arranged on the bottom plate 500 arranged away from the top of the housing 100, and a magnetic conductive block is arranged at the bottom of the housing 100 to isolate the high and low voltage loads, thereby increasing the distance between the main contact and the auxiliary contact assembly 700, thereby increasing the creepage distance and the air distance, and improving the isolation effect of high and low loads; the main contact and the auxiliary contact assembly 700 do not affect each other, avoiding the arc generated by the main contact working to the auxiliary The impact or damage caused by the contact assembly 700 improves the safety and reliability of the relay and extends the service life of the relay; by providing one or more lead-out rods 710 and auxiliary contacts installed on the lead-out rods 710, the number and matching method of the auxiliary contacts can be selected according to user needs to meet the needs of use; in addition, the auxiliary contact assembly 700 is arranged on the bottom plate 500 at the end of the sealing tube 400, occupies a small area, and does not increase the volume of the product, thereby improving the adaptability of the relay size to general electrical equipment. Its structure is simple, which is conducive to improving the market competitiveness of the product.

[0036] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high capacity relay with reliable auxiliary contacts, characterized in that: include: A housing, wherein a static contact for incoming wires and a static contact for outgoing wires are provided on the top of the housing, wherein the static contact for incoming wires is used to receive current from an external power supply device, and the static contact for outgoing wires is used to transmit current to an external electrical device, and a magnetic conductive block is provided on the bottom of the housing; A push rod assembly, comprising a push rod and a moving contact elastically connected to the push rod, wherein the moving contact is accommodated in the inner cavity of the housing and can move relative to the inner wall of the housing along the height direction of the housing to switch on and off the incoming static contact and the outgoing static contact; A sealing tube, the top of which is connected to the magnetic conductive block, a moving iron core is housed in the sealing tube, the moving iron core is connected to the push rod, a bottom plate for sealing the sealing tube is provided at the end of the sealing tube, and a monitoring chamber is formed between the bottom plate and the moving iron core; as well as An auxiliary contact assembly, comprising at least one group of lead-out rods passing through the bottom plate and connected to the bottom plate, each group of the lead-out rods comprising m lead-out rods, m being 2 or 3, when m=2, one of the lead-out rods in each group of the lead-out rods is provided with an auxiliary static spring at one end located in the monitoring chamber, and another lead-out rod in each group of the lead-out rods is provided with an auxiliary dynamic spring cooperating with the auxiliary static spring at one end located in the monitoring chamber; when m=3, an auxiliary dynamic spring is provided on the middle lead-out rod in each group of the lead-out rods at one end located in the monitoring chamber, and auxiliary static springs cooperating with the auxiliary dynamic spring are respectively provided on the other two lead-out rods in each group of the lead-out rods at one end located in the monitoring chamber; When the moving iron core moves in the sealing tube, it drives the push rod assembly to move so as to switch the incoming static contact and the outgoing static contact, and squeeze or release the auxiliary moving spring to switch the auxiliary moving spring and the auxiliary static spring; The magnetic conductive block is made of ferromagnetic material and is used to isolate the auxiliary contact assembly from the incoming static contact and the outgoing static contact 120 .

2. The high capacity relay according to claim 1, characterized in that: When m=2, the auxiliary static spring piece and the auxiliary dynamic spring piece are in normally open cooperation or normally closed cooperation.

3. The high capacity relay according to claim 1, characterized in that: The connection between the lead-out rod and the bottom plate is fixed by glass sintering.

4. The high capacity relay according to claim 1, characterized in that: A ceramic block is arranged on the bottom plate, and the connection between the lead-out rod and the bottom plate is fixed by ceramic brazing.

5. The high capacity relay according to claim 4, characterized in that: A transition piece is respectively arranged between the ceramic block and the lead-out rod and between the ceramic block and the bottom plate and fixed by high-temperature brazing. The material of the transition piece is pure copper or Kovar alloy.

6. The high capacity relay according to any one of claims 1 to 5, characterized in that: The bottom plate and the sealing tube are sealed and connected by laser welding or resistance welding.

7. The high capacity relay according to claim 6, characterized in that: The contact portion between the auxiliary moving spring piece and the auxiliary static spring piece is a pair of mutually matching convex points or riveted contact pieces or contact points.

8. The high capacity relay according to claim 7, characterized in that: The shell comprises a ceramic cover and a transition block connected to an opening portion of the ceramic cover by high-temperature brazing, and the magnetic conductive block is installed at the bottom of the outer surface of the transition block.

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