CN205335187U - A High Voltage DC Vacuum Relay - Google Patents

Abstract

The utility model relates to the technical field of relays, in particular to a high-voltage direct-current vacuum relay, which comprises a contact mechanism, a pushing mechanism, a ceramic cavity and an outer magnetic circuit mechanism; the contact mechanism comprises a wiring terminal, the wiring terminal is fixed on the ceramic cavity, and one end of the wiring terminal is introduced into the ceramic cavity; the external magnetic circuit mechanism is fixed outside the ceramic cavity; the pushing mechanism comprises a lower push rod, an iron core, a ceramic ring, an upper push rod and a moving point block matched with one end of the binding post; the ceramic ring is arranged between the upper push rod and the lower push rod; the moving point block is fixed at the upper end of the upper push rod; the iron core is fixed on the periphery of the lower push rod, the lower push rod moves towards the inside of the ceramic cavity under the action of the outer magnetic circuit mechanism, and therefore the ceramic ring and the upper push rod are pushed to move, and the moving point block is abutted to one end of the binding post. The pushing mechanism can not generate friction on the ceramic piece in operation, so that powder is generated in the relay cavity, and accidents are caused.

Description

A High Voltage DC Vacuum Relay

technical field

The utility model relates to the technical field of relays, in particular to a high-voltage DC vacuum relay.

Background technique

With the development of modern industrial technology, automation has been gradually carried out in various fields. In order to ensure the safety of electricity consumption and output power, the requirements for switching voltage and switching current of relays are getting higher and higher, such as: electric vehicles, hybrid vehicles, Fuel cell vehicles, construction machines, power management, charging-discharging devices, frequency conversion control, solar power system control, welding equipment, elevators, etc. However, traditional relays are limited by their own manufacturing technology, especially the small contact gap. When connecting high-voltage AC, high-voltage DC, large DC motors, and low power factor inductive loads, the relay contacts are very prone to bonding failure or continuous arcing. The ignition contact system fails.

Relays in the prior art usually use ceramics as the insulating material of the movement mechanism, and the ceramic part is arranged between the push rod and the moving point block. This structure is simple and easy to process, and the cost is low. However, when the push mechanism of the relay of this structure is When the overtravel is working, the ceramic parts will produce powder due to friction. When the relay is working, the powder inside will cause accidents.

Utility model content

The utility model provides a high-voltage direct-current vacuum relay for the problem that the push mechanism of the prior art will produce powder due to the friction of the ceramic parts when it is in the over-travel working state, and the utility model adopts the following technical scheme:

A high-voltage DC vacuum relay, including a contact mechanism, a push mechanism, a ceramic cavity and an external magnetic circuit mechanism; the contact mechanism includes a terminal, the terminal is fixed on the ceramic cavity, and one end of the terminal is introduced into the ceramic cavity Inside the body; the external magnetic circuit mechanism is fixed outside the ceramic cavity; the pushing mechanism includes a lower push rod, an iron core, a ceramic ring, an upper push rod and a moving point block matched with one end of the terminal; the ceramic ring Set between the upper push rod and the lower push rod; the moving point block is fixed on the upper end of the upper push rod; the iron core is fixed on the periphery of the lower push rod, and the iron core makes the lower push rod The interior of the ceramic cavity moves, thereby pushing the ceramic ring and the upper push rod to move, so that the moving point block abuts against one end of the terminal post.

Wherein, the upper end of the push rod is also provided with a retaining ring and a moving point block gasket; the moving point block is clamped between the retaining ring and the moving point block gasket.

Wherein, the ceramic cavity includes a ceramic cover, a fixing frame and a yoke plate; the yoke plate serves as a base, the fixing frame is fixedly connected to the yoke plate, and the ceramic cover is fixedly connected to the fixed On the frame, an airtight accommodating space is formed inside the ceramic cavity; the yoke plate is provided with a through hole for the movement of the pushing mechanism.

Further, the iron core includes a moving iron core and a static iron core; the moving iron core is sleeved on the lower end of the lower push rod; the static iron core is fixed on the lower end surface of the yoke plate; the A return spring is fixed between the moving iron core and the static iron core.

Wherein, the push mechanism further includes a lower push rod link; the lower push rod link is fixedly connected to the lower end surface of the ceramic ring and forms an accommodating space, and the upper end of the lower push rod is clamped in the accommodating space Inside; the lower end surface of the upper push rod is fixedly connected with the upper end surface of the ceramic ring.

Further, a rubber pad is provided between the lower push rod link and the ceramic cavity.

Wherein, an overtravel spring is sleeved between the ceramic ring and the moving point block.

Wherein, the high-voltage DC vacuum relay further includes an arc-extinguishing magnet for blowing off the arc generated by the moving point block and the terminal, and the arc-extinguishing magnet is fixed outside the ceramic cavity.

Beneficial effects of the utility model: the utility model can work in a high-voltage environment above 400V for a long time, and the ceramic ring in the push mechanism plays the role of insulation and conduction thrust. The utility model sets the ceramic ring on the upper push rod and the lower push rod. Between the push rods, this structure prevents the push mechanism from rubbing against the ceramic parts during operation, so as to avoid the generation of powder inside the relay cavity and cause accidents. In addition to the above-mentioned beneficial effects, the utility model also has the following advantages: simple and compact structure, small volume, light weight, strong anti-vibration and impact performance, simple process, easy processing of parts, and good electric vacuum performance. The vacuum degree required for the work in the vacuum cavity is guaranteed, and the production cost is low, and it can be produced in large quantities on an assembly line.

Description of drawings

Fig. 1 is the top view of the utility model.

Fig. 2 is a sectional view along line A-A in Fig. 1 .

Reference numerals in Figures 1 to 2 include:

1-Up push rod 2-Ceramic ring 3-Down push rod 4-Moving point block 5-Static iron core

6-moving iron core 7-return spring 8-outer magnetic circuit mechanism 9-retaining ring

10-moving point block gasket 11-overtravel spring 12-terminal post 13-lower push rod chain

14-rubber pad 15-yoke iron plate 16-fixed frame 17-ceramic cover 18-arc extinguishing magnet.

detailed description

In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not limitations of the utility model. Below in conjunction with accompanying drawing, the utility model is described in detail:

As shown in Figures 1-2: a high-voltage DC vacuum relay, including a contact mechanism, a push mechanism, a ceramic cavity and an external magnetic circuit mechanism 8; the contact mechanism includes a terminal 12, and the terminal 12 is fixed on the ceramic On the cavity, one end of the terminal post 12 is introduced into the ceramic cavity; the external magnetic circuit mechanism 8 is fixed outside the ceramic cavity; the pushing mechanism includes a lower push rod 3, an iron core, a ceramic ring 2, an upper push rod 1 and A moving point block 4 matched with one end of the terminal 12; the ceramic ring 2 is arranged between the upper push rod 1 and the lower push rod 3; the moving point block 4 is fixed on the upper end of the upper push rod 1; The iron core is fixed on the periphery of the lower push rod 3, and the iron core moves the lower push rod 3 to the inside of the ceramic cavity under the action of the external magnetic circuit mechanism 8, thereby pushing the ceramic ring 2 and the upper push rod 1 to move, so that the moving point The block 4 abuts against one end of the terminal 12 to form a conduction loop. The utility model adopts the ceramic ring 2 to isolate the structure of the upper push rod 1 and the lower push rod 3 to replace the integrally formed push rod commonly used in the relay in the prior art, and the ceramic ring 2 plays a role in insulating the lower push rod 3 from the moving point block 4 The function of transmitting the thrust of the lower push rod 3 to the upper push rod 1, and avoiding the accident caused by the powder generated by the friction of the ceramic parts in the overtravel working state of the pushing mechanism, the structure is compact, the space is small, and the processing is simple .

In this embodiment, the upper end of the upper push rod 1 is also provided with a retaining ring 9 and a moving point block gasket 10; the moving point block 4 is clamped on the retaining ring 9 and the moving point block gasket Between 10. The setting of the retaining ring 9 and the moving point block gasket 10 helps the moving point block 4 to remain stable when it abuts against the terminal 12, and the moving point block 4 will not fall off from the upper push rod 1 due to excessive leverage force. Ensure product safety and reliability.

In this embodiment, the ceramic cavity includes a ceramic cover 17, a fixed frame 16 and a yoke plate 15; the yoke plate 15 serves as a base, and the fixed frame 16 is fixedly connected to the yoke plate 15, The ceramic cover 17 is fixedly connected to the fixing frame 16, so that an airtight accommodating space is formed inside the ceramic cavity; the yoke plate 15 is provided with a through hole for the movement of the pushing mechanism. Specifically, welding the fixing frame 16 to the yoke iron plate 15 and welding the ceramic cover 17 to the fixing frame 16 are preferred. The ceramic cavity is filled with _H2 and other protective gases, and the oxygen gas is discharged to form an airtight space to ensure the long-term working needs of the product for switching large current and DC high voltage loads.

Wherein, the iron core includes a moving iron core 6 and a static iron core 5; the moving iron core 6 is sleeved on the lower end of the lower push rod 3; the static iron core 5 is fixed on the yoke iron plate 15 The lower end surface; a return spring 7 is fixed between the moving iron core 6 and the static iron core 5 . The moving iron core 6 moves towards the static iron core 5 under the action of the external magnetic circuit mechanism, thereby pushing the lower push rod 3 to move to the interior of the ceramic cavity, and brings about a series of actions of the subsequent pushing mechanism; when the external magnetic circuit mechanism stops functioning , the return spring will impel the moving iron core 6 to reset, so that the pushing mechanism is reset as a whole, and the moving point block 4 is disconnected from the terminal 12.

In this embodiment, the push mechanism further includes a lower push rod link 13; the lower push rod link 13 is fixedly connected to the lower end surface of the ceramic ring 2 and forms an accommodating space, and the upper end of the lower push rod 3 It is clamped in the accommodating space; the lower end surface of the upper push rod 1 is fixedly connected with the upper end surface of the ceramic ring 2 . Specifically, it is preferred to weld the lower push rod link 13 to the lower end surface of the ceramic ring 2, and weld the lower end surface of the upper push rod 1 to the upper end surface of the ceramic ring 2. Of course, other fixed connections can also be used depending on the specific application. Way. The upper end surface of the lower push rod link 13 is fixedly connected with the ceramic ring 2 , and the lower end surface of the lower push rod link 13 is provided with an accommodating space where the lower push rod 3 is clamped. The overall hard connection of the pushing mechanism can ensure that the pushing mechanism will not deviate when it moves, ensure the power transmission efficiency of the pushing mechanism, and prolong the life of the pushing mechanism.

Wherein, a rubber pad 14 is provided between the lower push rod link 13 and the ceramic cavity. When the arc of the product is broken, the pushing mechanism will move downward rapidly as a whole, causing a collision with the ceramic cavity. There is a rubber pad 14 between the lower push rod link 13 and the ceramic cavity, which can effectively buffer the impact force of the pushing mechanism and prevent pushing The overall rebound of the mechanism ensures the stable operation of the parts and prolongs the service life of the product.

In this embodiment, an overtravel spring 11 is sleeved between the ceramic ring 2 and the moving point block 4 . The terminal 12 will inevitably be worn to a certain extent during the use of the product. The setting of the overtravel spring 11 can provide an additional thrust for the pushing mechanism to ensure that the moving point block 4 can still be tightened when the terminal 12 is worn. Tightly abut against the terminal 12 to form a stable electrical connection, ensure the abutment pressure, and reduce the working resistance.

In this embodiment, the high-voltage DC vacuum relay also includes an arc extinguishing magnet 18 that blows off the arc generated by the moving point block 4 and the terminal 12, and the arc extinguishing magnet 18 is fixed in the ceramic cavity external. The setting of the arc extinguishing magnet 18 helps to blow off the arc generated when the terminal 12 is disconnected from the moving point block 4 in a high-current working environment, increases the disconnection efficiency of the terminal 12 and the moving point block 4, and ensures the product performance. working normally.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as above with the preferred embodiment, it is not used to limit the utility model. Anyone who is familiar with the utility model Professional technicians, without departing from the scope of the technical solution of the present utility model, should use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the present utility model, the The utility model technology refers to any simple modification, equivalent change and modification made to the above embodiments, which all belong to the scope of the utility model technical solution.

Claims (8)

1. a voltage DC vacuum relay with high, including contact mechanism, pushing mechanism, ceramic cavity and external magnetic circuit mechanism；Described contact mechanism includes binding post, and described binding post is fixed on ceramic cavity, and one end of binding post is incorporated in ceramic cavity；Described external magnetic circuit mechanism is fixed on outside ceramic cavity；It is characterized in that: described pushing mechanism includes lower push-rod, iron core, ceramic ring, upper push-rod and the dynamic some block with the one end fits of described binding post；Described ceramic ring is located between upper push-rod and lower push-rod；Described dynamic some block is fixed on the upper end of upper push-rod；Described iron core is fixed on the periphery of lower push-rod, making lower push-rod internal mobile to ceramic cavity, thus promoting ceramic ring and upper push-rod to move, making described dynamic some block abut with one end of described binding post under the effect of iron core magnetic path outside。

2. a kind of voltage DC vacuum relay with high according to claim 1, it is characterised in that: the upper end of described upper push-rod is additionally provided with back-up ring and dynamic some block pad；Described dynamic some block is fastened between described back-up ring and described dynamic some block pad。

3. a kind of voltage DC vacuum relay with high according to claim 1, it is characterised in that: described ceramic cavity includes ceramic shield, fixed mount and yoke plate；Described yoke plate is as base, and described fixed mount is fixedly connected on described yoke plate, and described ceramic shield is fixedly connected on described fixed mount, makes ceramic cavity be internally formed airtight accommodation space；Described yoke plate is provided with mean for the through hole of described pushing mechanism motion。

4. a kind of voltage DC vacuum relay with high according to claim 3, it is characterised in that: described iron core includes dynamic iron core and static iron core；Described dynamic iron core sleeve is located at the lower end of described lower push-rod；Described static iron core is fixed on the lower surface of described yoke plate；It is fixed with back-moving spring between described dynamic iron core and static iron core。

5. a kind of voltage DC vacuum relay with high according to claim 1, it is characterised in that: described pushing mechanism also includes the lower push-rod chain of rings；The described lower push-rod chain of rings is fixedly connected on the lower surface of described ceramic ring and forms accommodation space, and the upper end of described lower push-rod is fastened in described accommodation space；The lower surface of described upper push-rod is fixing with the upper surface of described ceramic ring to be connected。

6. a kind of voltage DC vacuum relay with high according to claim 5, it is characterised in that: it is provided with rubber blanket between the described lower push-rod chain of rings and ceramic cavity。

7. a kind of voltage DC vacuum relay with high according to claim 1, it is characterised in that: also it is arranged with excess of stroke spring between described ceramic ring and described dynamic some block。

8. a kind of voltage DC vacuum relay with high according to claim 1, it is characterized in that: the blowout magnet that the electric arc that voltage DC vacuum relay with high also includes that described dynamic some block and described binding post are produced blows, described blowout magnet is fixed on outside described ceramic cavity。