CN213988746U

CN213988746U - High-capacity relay with reliable auxiliary contacts

Info

Publication number: CN213988746U
Application number: CN202022508349.XU
Authority: CN
Inventors: 包锋
Original assignee: Suzhou Xinmai Intelligent Electronic Technology Co ltd
Current assignee: Suzhou Xinmai Intelligent Electronic Technology Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-08-17
Anticipated expiration: 2030-11-03

Abstract

The invention relates to the technical field of relays and discloses a high-capacity relay with reliable auxiliary contacts, which comprises a shell, a push rod assembly and a sealing tube, wherein the top of the shell is provided with an incoming line static contact and an outgoing line static contact, the bottom of the shell is provided with a magnetic conduction block, the push rod assembly is composed of a moving contact accommodated in the shell and a push rod elastically connected with the moving contact, the sealing tube is connected with the magnetic conduction block, the inner cavity of the sealing tube accommodates a moving iron core connected with the push rod, and a monitoring chamber is formed between a bottom plate at the tail end of the sealing tube and the moving iron core; the auxiliary contact assembly penetrates through the bottom plate and comprises at least one group of leading-out rods, each group of leading-out rods comprises m leading-out rods, m is 2 or 3, and when m is 2, each group of leading-out rods is respectively provided with an auxiliary static spring piece and an auxiliary movable spring piece; when m is 3, an auxiliary movable spring piece is arranged on the middle leading-out rod in each group of leading-out rods, and auxiliary static spring pieces are respectively arranged on the other two leading-out rods; the movable iron core pushes the push rod assembly to move so as to switch on and off the incoming line static contact and the outgoing line static contact, and the auxiliary movable reed is squeezed or released so as to switch on and off the auxiliary contact assembly.

Description

High-capacity relay with reliable auxiliary contacts

Technical Field

The present invention relates to the field of relay technology, and in particular, to a high capacity relay with reliable auxiliary contacts isolated from the main circuit.

Background

The relay is an electric control device which makes the controlled quantity generate a predetermined step change in an electric output circuit when the change of the input quantity (excitation quantity) reaches the specified requirement, and is composed of a control system (also called an input circuit) and a controlled system (also called an output circuit) which are interactively matched, and plays the roles of automatic regulation, safety protection, circuit conversion and the like in the circuit. With the rise of green energy, high capacity relay is widely used in high voltage direct current loads such as on-vehicle, photovoltaic and charging pile, and in view of the above-mentioned application scenario of high voltage direct current load, often need set up the auxiliary contact and monitor the state of main contact and carry out low pressure coordinated control to promote security and the reliability that electrical equipment used.

However, because the load voltage of high-capacity relays in the fields of new energy vehicles, photovoltaics, industrial control and the like is relatively high, the relays often adopt a ceramic sealing structure based on consideration of safety, reliability and other factors, and the installation difficulty of auxiliary contacts is improved due to the arrangement of the ceramic sealing structure, so that the performance of the relays is reduced. For example, chinese patent application No. CN202010366809.1 discloses a high-voltage dc relay with auxiliary contacts, which adds a set of normally open auxiliary contacts on the top of a ceramic cavity, and has a simple structure, but because the main contacts and the auxiliary contacts are distributed on the top of the ceramic, the high-low load isolation effect is poor; when the main contact breaks the load, the electric arc is easy to jump to the auxiliary contact, so that high and low loads are communicated, even the auxiliary contact is burnt, and potential safety hazards exist; metal particles splashed by the main contact easily pollute the auxiliary contact, and the reliability of the auxiliary contact cannot be ensured; the switch logic of the auxiliary contact of the structure is single, and the auxiliary contact is synchronously switched on and off with the main contact, so that the action under the opposite logic is difficult to realize; the auxiliary contact of the structure is single in form and only has a normally-open structure, so that the requirement of the relay on the normally-closed auxiliary contact is difficult to meet; the auxiliary contact size is great, can only set up a set of at ceramic cavity's top usually, and when needs set up multiunit auxiliary contact, the increase of relay structure volume, the structure is complicated, and cost promotion and reliability descend in step, are unfavorable for promoting the market competition of product.

Disclosure of Invention

In view of this, there is a need to provide a high capacity relay with reliable auxiliary contacts isolated from the main circuit, in response to the deficiencies of conventional high capacity relays.

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

the top of the shell is provided with an incoming line static contact and an outgoing line static contact in a penetrating mode, the incoming line static contact is used for being connected with current by an external power supply device, the outgoing line static contact is used for transmitting the current to external electrical equipment, and the bottom of the shell is provided with a magnetic conduction block;

the push rod assembly comprises a push rod and a moving contact elastically connected with the push rod, and the moving contact is accommodated in the inner cavity of the shell and can move relative to the inner wall of the shell along the height direction of the shell so as to switch on and off the incoming line static contact and the outgoing line static contact;

the top end of the sealing tube is connected with the magnetic conduction block, a movable iron core is accommodated in the sealing tube and connected with the push rod, a bottom plate used for plugging the sealing tube is arranged at the tail end of the sealing tube, and a monitoring chamber is formed between the bottom plate and the movable iron core; and

the auxiliary contact assembly comprises at least one group of leading-out rods which penetrate through the bottom plate and are connected with the bottom plate, each group of leading-out rods comprises m leading-out rods, m is 2 or 3, when m is 2, one end, positioned in the monitoring chamber, of one leading-out rod in each group of leading-out rods is provided with an auxiliary static reed, and one end, positioned in the monitoring chamber, of the other leading-out rod in each group of leading-out rods is provided with an auxiliary movable reed matched with the auxiliary static reed; when m is 3, an auxiliary movable spring piece is arranged at one end, positioned in the monitoring chamber, of the middle extraction rod in each group of extraction rods, and auxiliary static spring pieces matched with the auxiliary movable spring pieces are respectively arranged at one ends, positioned in the monitoring chamber, of the other two extraction rods in each group of extraction rods;

when the movable iron core moves in the sealing tube, the push rod assembly is driven to move to switch on and off the incoming line static contact and the outgoing line static contact, and the auxiliary movable reed is squeezed or released to switch on and off the auxiliary movable reed and the auxiliary static reed.

In one embodiment, when m is 2, the auxiliary static spring plate is in normally open fit or normally closed fit with the auxiliary movable spring plate.

In one embodiment, the joint of the extraction rod and the bottom plate is fixed in a glass sintering mode.

In one embodiment, a ceramic block is arranged on the bottom plate, and the joint of the extraction rod and the bottom plate is fixed in a ceramic brazing mode.

In one embodiment, transition pieces are respectively arranged between the ceramic block and the leading-out rod and between the ceramic block and the bottom plate and are fixed through high-temperature brazing, and the transition pieces are made of pure copper or kovar alloy.

In one embodiment, the base plate and the sealing tube are hermetically connected by laser welding or resistance welding.

In one embodiment, the contact parts of the auxiliary movable spring plate and the auxiliary static spring plate are a pair of mutually matched salient points or riveted contact plates or contacts.

In one embodiment, the shell comprises a ceramic casing and a transition block connected with an opening part of the ceramic casing through high-temperature brazing, and the magnetic conduction block is installed at the bottom of the outer surface of the transition block.

According to the high-capacity relay with the reliable auxiliary contacts, the incoming line static contact and the outgoing line static contact, namely the main contact, are arranged at the top of the shell, the auxiliary contact assembly is arranged on the bottom plate far away from the top of the shell, and the magnetic conduction block is arranged at the bottom of the shell to isolate high and low voltage loads, so that the distance between the main contact and the auxiliary contact assembly is increased, the creepage distance and the air distance are further increased, and the isolation effect of the high and low loads is improved; the main contact and the auxiliary contact assembly are not affected with each other, so that the influence or damage of an electric arc generated in the working process of the main contact on the auxiliary contact assembly is avoided, the use safety and reliability of the relay are improved, and the service life of the relay is prolonged; through arranging one or more groups of leading-out rods and auxiliary contacts arranged on the leading-out rods, the number and the matching mode of the auxiliary contacts can be selected according to the requirements of users so as to meet the use requirements; in addition, the auxiliary contact assembly is arranged on the bottom plate at the end part of the sealing pipe, the occupied area is small, the size of a product cannot be increased, the adaptability of the size of the relay to general electrical equipment is improved, the structure is simple, and the market competitiveness of the product is favorably improved.

Drawings

FIG. 1 is a schematic diagram of a high capacity relay in one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the high capacity relay in the embodiment of FIG. 1;

FIG. 3 is an exploded view of the high capacity relay of the embodiment of FIG. 1;

FIG. 4 is a view of the mating relationship of the exit post to the base plate in accordance with one embodiment of the present invention;

fig. 5 is a view showing the fitting relationship between the extraction rod and the base plate according to another embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 to 3 together, the present invention provides a high capacity relay 10 with reliable auxiliary contacts isolated from a main circuit, the high capacity relay 10 includes a housing 100 having an incoming static contact 110 and an outgoing static contact 120 penetrating through the top thereof and a magnetic conductive block 130 disposed at the bottom thereof; the push rod assembly 200 is formed by a movable contact 210 which is accommodated in the inner cavity of the shell 100 and can move along the height direction of the shell 100 relative to the inner wall of the shell 100 so as to switch on and off the incoming line fixed contact 110 and the outgoing line fixed contact 120, and a push rod 220 which is elastically connected with the movable contact 210 to push the movable contact 210 to move; the top end of the sealing tube 400 is connected with the magnetic conduction block 130, the inner cavity of the sealing tube 400 is used for accommodating the movable iron core 300 connected with the push rod 220, the tail end of the sealing tube 400 is provided with a bottom plate 500 used for plugging the sealing tube 400, and a monitoring chamber 600 is formed between the bottom plate 500 and the movable iron core 300; the auxiliary contact assembly 700 comprises at least one group of leading-out rods 710 penetrating through the bottom plate 500 and connected with the bottom plate 500, each group of leading-out rods 710 comprises m leading-out rods 710, m is 2 or 3, when m is 2, one end, positioned in the monitoring chamber 600, of one leading-out rod 710 in each group of leading-out rods 710 is provided with an auxiliary static spring leaf 720, and one end, positioned in the monitoring chamber 600, of the other leading-out rod 710 in each group of leading-out rods 710 is provided with an auxiliary movable spring leaf 730 matched with the auxiliary static spring leaf 720; when m is 3, an auxiliary movable spring piece 730 is arranged at one end of the middle extraction rod 710 in each group of extraction rods 710, which is positioned in the monitoring chamber 600, and an auxiliary stationary spring piece 720 matched with the auxiliary movable spring piece 730 is respectively arranged at one ends of the other two extraction rods 710 in each group of extraction rods 710, which are positioned in the monitoring chamber 600, it can be understood that when m is 3, the auxiliary contact assembly 700 comprises at least one group of conversion-type auxiliary contacts. It should be noted that the height direction of the housing 100 in the present embodiment is a direction from the top of the housing 100 to the bottom of the housing 100, and other embodiments can be explained with reference to this.

The housing 100 is used to isolate an arc generated when the incoming line static contact 110 and the outgoing line static contact 120 are conducted through the moving contact 210 from an external environment, so as to improve the safety of the relay in use. In one embodiment, the housing 100 includes a ceramic shell 140 and a transition block 150 that is brazed to the ceramic shell 140 at an opening thereof. Of course, the housing 100 may be a one-piece molded structure. The ceramic cover 140 is used to block the burning of the inner surface of the housing 100 by the metal spatter generated by the arc, so as to further improve the safety of the relay.

The incoming static contact 110 and the outgoing static contact 120 are main contacts of the high-capacity relay 10 in this embodiment, where the incoming static contact 110 is used for receiving current from an external power supply device, and the outgoing static contact 120 is used for transmitting current to external electrical equipment, it can also be understood that the incoming static contact 110 and the outgoing static contact 120 can be respectively regarded as leads of two poles of the relay, and the two are used together to communicate the relay with an external power supply and a load circuit, so as to facilitate the relay to switch on or switch off the circuit.

The magnetic conductive block 130 is made of a ferromagnetic material and is used for isolating the auxiliary contact assembly 700 from the incoming line static contact 110 and the outgoing line static contact 120, specifically, in the working process of the relay, a high voltage is introduced into the parts of the incoming line static contact 110 and the outgoing line static contact 120, that is, a high voltage end is obtained, the auxiliary contact assembly 700 is a low voltage end, that is, the high voltage end and the low voltage end are isolated by the magnetic conductive block 130, so that an arc generated when the moving contact 210 is communicated with the incoming line static contact 110 and the outgoing line static contact 120 is prevented from jumping to the part of the auxiliary contact assembly 700, the safety of the relay is improved, and the reliability of state monitoring through the auxiliary contact assembly 700 is ensured.

The bottom plate 500 is used for plugging the monitoring chamber 600, and the reliability of the auxiliary contact assembly 700 on the relay state monitoring operation is ensured. In one embodiment, the base plate 500 and the sealing tube 400 are hermetically coupled by laser welding or resistance welding. Specifically, in practical application, the inner cavity of the casing 100 is filled with gas, and the sealing performance of the casing 100 is ensured by the laser welding or resistance welding sealing connection mode, so as to avoid the gas leakage problem.

The leading-out rod 710 is used for being electrically connected with external electrical equipment or control equipment, and is used for sending the state information in the relay to the external electrical equipment or control equipment for monitoring and analyzing so as to master the state parameters in the relay. Referring to fig. 4, in an embodiment, the connection portions of the extraction rods 710 and the bottom plate 500 are fixed by glass sintering, and after glass sintering, a gap between each extraction rod 710 and the bottom plate 500 is filled with a glass body 740, so as to achieve the purposes of improving the connection strength between the extraction rod 710 and the bottom plate 500 and improving the air tightness of the monitoring chamber 600.

Referring to fig. 5, in another embodiment, a ceramic block 750 is disposed on one side of the bottom plate 500, and the connection position of the extraction rod 710 and the bottom plate 500 is fixed by ceramic brazing. The ceramic block 750 may be disposed on the top of the base plate 500 or on the bottom of the base plate 500, depending on the size of the monitoring chamber 600. Further, in an embodiment, a transition piece is disposed between the ceramic block 750 and the extraction rod 710 and between the ceramic block 750 and the bottom plate 500, and is fixed by high temperature brazing, and the transition piece is made of pure copper or kovar (i.e. iron-nickel-cobalt alloy). Transition pieces made of pure copper or kovar alloy are arranged on the matching surface between the ceramic block 750 and the extraction rod 710 and the matching surface between the ceramic block 750 and the base plate 500, and high-temperature brazing is performed, so that the purposes of improving the connection quality and the sealing quality are achieved.

The auxiliary movable spring plate 730 is used for being connected with or disconnected from the auxiliary static spring plate 720 under the action of the movable iron core 300 so as to change the potential value output to the external electrical equipment, so that an operator can judge the working state of the relay according to the potential value of the external electrical equipment. In one embodiment, the contact portions of the auxiliary movable spring plate 730 and the auxiliary stationary spring plate 720 are a pair of convex points or riveted contact plates or contacts which are matched with each other. Certainly, the connecting portion between the auxiliary movable spring 730 and the auxiliary stationary spring 720 can also adopt other matching forms, so as to easily make the auxiliary movable spring 730 and the auxiliary stationary spring 720 on and off, which is not described herein again.

In one embodiment, when m is 2, the auxiliary contact assembly 700 includes a plurality of pairs of auxiliary stationary spring pieces 720 and auxiliary movable spring pieces 730 assembled to form an auxiliary contact unit, and the auxiliary stationary spring pieces 720 and the auxiliary movable spring pieces 730 of each auxiliary contact unit can be designed to be in a normally open configuration or a normally closed configuration, that is, the auxiliary stationary spring pieces 720 and the auxiliary movable spring pieces 730 are in normally open or normally closed engagement. In the actual design, the assembly relationship of the auxiliary contact assembly 700 may be combined according to the use scenario of the relay, for example, when the auxiliary contact assembly 700 includes two sets of auxiliary contact units, the auxiliary contact unit may be any combination of two sets of normally open auxiliary contact units, two sets of normally closed auxiliary contact units, two sets of switching auxiliary contact units, and three types of auxiliary contact units, which is not described herein again.

The principle of the auxiliary contact assembly 700 of the present invention for monitoring the state of the relay is as follows: when the movable iron core 300 moves in the sealing tube 400, the push rod assembly 200 is driven to move to switch on and off the incoming line static contact 110 and the outgoing line static contact 120, and the auxiliary movable reed 730 is pressed or released to switch on and off the auxiliary movable reed 730 and the auxiliary static reed 720. Here, it is illustrated that the auxiliary stationary spring 720 and the auxiliary movable spring 730 are in a normally closed type matching structure, specifically, when the movable iron core 300 is not powered on, the movable iron core 300 is pressed toward the auxiliary movable spring 730 under the action of gravity, so that the auxiliary movable spring 730 and the auxiliary stationary spring 720 are closed, when the movable iron core 300 is powered on, the movable iron core 300 moves toward the top of the housing 100, in the process, the movable iron core 300 leaves the auxiliary movable spring 730, so that the auxiliary movable spring 730 and the auxiliary stationary spring 720 are separated, meanwhile, the movable iron core 300 pushes the push rod 220, and further pushes the movable contact 210 to be respectively connected with the incoming line stationary contact 110 and the outgoing line stationary contact 120, so as to conduct current, and thus, when an electrical device connected with a group of the outgoing rods 710 of the auxiliary contact assembly 700 does not monitor an electrical signal or the electrical signal suddenly changes to zero, it can be determined that the relay is in a connected state. On the contrary, when the auxiliary stationary spring 720 and the auxiliary movable spring 730 are in a normally open type matching structure, the monitoring logic of the relay is reversed, that is, when the electric signal monitored by the external electrical device suddenly changes to zero, it can be determined that the relay is in the off state.

According to the high-capacity relay 10 with the reliable auxiliary contacts, the incoming line static contact 110 and the outgoing line static contact 120, namely the main contact, are arranged at the top of the shell 100, the auxiliary contact assembly 700 is arranged on the bottom plate 500 far away from the top of the shell 100, and the magnetic conduction block is arranged at the bottom of the shell 100 to isolate high and low voltage loads, so that the distance between the main contact and the auxiliary contact assembly 700 is increased, the creepage distance and the air distance are further increased, and the isolation effect of the high and low loads is improved; the main contact and the auxiliary contact assembly 700 are not affected with each other, so that the influence or damage of electric arcs generated in the working process of the main contact on the auxiliary contact assembly 700 is avoided, the use safety and reliability of the relay are improved, and the service life of the relay is prolonged; by arranging one or more groups of leading-out rods 710 and the auxiliary contacts arranged on the leading-out rods 710, the number and the matching mode of the auxiliary contacts can be selected according to the requirements of users so as to meet the use requirements; in addition, the auxiliary contact assembly 700 is arranged on the bottom plate 500 at the end part of the sealing tube 400, the occupied area is small, the size of a product cannot be increased, the adaptability of the size of the relay to general electrical equipment is improved, the structure is simple, and the market competitiveness of the product is favorably improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A high capacity relay with reliable auxiliary contacts, comprising:

2. The high capacity relay according to claim 1, wherein the auxiliary stationary spring is normally open engaged or normally closed engaged with the auxiliary movable spring when m-2.

3. The high capacity relay according to claim 1, wherein the junction of the extraction rod and the base plate is fixed by glass sintering.

4. The high-capacity relay according to claim 1, wherein a ceramic block is disposed on the base plate, and a joint of the extraction rod and the base plate is fixed by ceramic brazing.

5. The high-capacity relay according to claim 4, wherein a transition piece is arranged between the ceramic block and the extraction rod and between the ceramic block and the bottom plate respectively and is fixed by high-temperature brazing, and 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, wherein the base plate and the sealing tube are hermetically connected by laser welding or resistance welding.

7. The high capacity relay according to claim 6, wherein the contact portions of the auxiliary movable spring and the auxiliary stationary spring are a pair of convex points or riveted contact pieces or contacts which are matched with each other.

8. The high-capacity relay according to claim 7, wherein the housing comprises a ceramic casing and a transition block connected with the opening of the ceramic casing by high-temperature brazing, and the magnetic conduction block is mounted at the bottom of the outer surface of the transition block.