CN210640394U

CN210640394U - Electric connector for traction transformer

Info

Publication number: CN210640394U
Application number: CN201922308709.9U
Authority: CN
Inventors: 李伟; 陈勇; 许兵
Original assignee: Sichuan Yonggui Science and Technology Co Ltd
Current assignee: Sichuan Yonggui Science and Technology Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-05-29
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses an electric connector for traction transformer, including socket and plug: the socket comprises a pin fixing seat, a fixing panel and a cylindrical ceramic body, wherein two ends of the ceramic body are respectively connected to the pin fixing seat and the fixing panel in a welding mode, a sealed cavity is formed in the welded ceramic body, and a pin is connected to the pin fixing seat through threads; the plug comprises a shell and a jack body arranged in the shell, wherein a wire connecting hole is formed in the jack body, the inner surface of the jack body is a non-smooth wall surface, and a plurality of metal wires are arranged between the outer part of the jack body corresponding to the jack and the shell; the utility model discloses a detachable construction design can be so that the socket in high-pressure oil environment, need not carry out the oil drain and accomplish the change to the contact pin on dismantling the basis of socket, has improved the maintainability ability of whole connector, has reduced cost of maintenance.

Description

Electric connector for traction transformer

Technical Field

The invention relates to the field of connectors, in particular to an electric connector for a traction transformer, which is used on a motor car.

Background

The electric connector socket used for the output of the traction transformer is immersed in transformer oil, the output current is large, the temperature of the transformer oil is increased, and the socket is difficult to overhaul, so that the electric connector is required to have high oil resistance, high protection performance, high electric performance and high maintainability.

The existing electric connector uses engineering plastics as insulating materials, has good electrical performance, but has a degradation effect on the insulating performance of the plastics after being soaked in transformer oil for a long time, and has higher failure risk. In terms of protection performance, the existing electric connector uses a rubber sealing ring for sealing to prevent leakage of transformer oil, and aging of rubber is inevitable, which requires periodic replacement of the rubber sealing ring, and replacement cost is very high due to transformer oil. The existing electric connector contact pin installation mode and wiring mode are integral, and can only be integrally replaced when needing maintenance and replacement, thereby causing great cost waste. The transformer has large output current, the overcurrent capacity of the existing electric connector is increased by improving the sectional area of a contact pair, and the electric connector is correspondingly increased, so that the electric connector is not beneficial to installation and use.

For the existing plug matched with the socket, the connection between the contact pin and the jack always has the trouble of small effective contact area due to the manufacturing process and the use environment, and the maintenance of the jack body can cause the replacement of the cable due to the connection of the cable, so that the field construction maintenance is not facilitated.

For the existing plug matched with the socket, the connection between the contact pin and the jack always has the trouble of small effective contact area due to the manufacturing process and the use environment, and the maintenance of the jack body can cause the replacement of the cable due to the connection of the cable, so that the field construction maintenance is not facilitated. The prior elastic element is usually in the form of a socket-splitting groove closing-up, or an elastic part is added, and the following disadvantages are caused by the prior elastic element:

1. the elasticity of the opening of the split groove is generated by the strength of the material, and the strength is high, the conductivity is reduced, the temperature of the contact is increased, and particularly when a large current is passed, the contact failure can be caused;

2. one more contact conversion is realized by adding one part, so that the contact resistance is increased inevitably, and the product is likely to lose efficacy when passing large current;

3. no matter the groove is split to close or the parts are added, when a large current is passed, the diameter of the contact pair is increased along with the increase of the current, and when the current reaches a certain magnitude, the diameter of the contact pair is large, so that the product is large in size and difficult to operate;

4. the connection of the large-current jack and the cable usually adopts a compression mode or a terminal, but the connection has the defects of low reliability and difficult operation.

Disclosure of Invention

The invention provides an improvement on the basis of the prior art, and aims to change a socket of the prior connector and realize replacement of a pin without taking off the socket integrally during maintenance.

Another object of the present invention is to replace the insulating material on the basis of the existing socket and to solve the problem that the ceramic material cannot be used normally.

Another object of the present invention is to improve upon the prior art plug to solve the problem of the effective contact area between the pin and the socket.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electrical connector for a traction transformer, comprising a socket and a plug:

the socket comprises a pin fixing seat, a fixing panel and a cylindrical ceramic body, wherein two ends of the ceramic body are respectively connected to the pin fixing seat and the fixing panel in a welding mode, a sealed cavity is formed in the welded ceramic body, and a pin is connected to the pin fixing seat through threads;

the plug comprises a shell and a jack body arranged in the shell, wherein a wire connecting hole is formed in the jack body, the inner surface of the jack body is a non-smooth wall surface, and a plurality of metal wires are arranged between the outer portion of the jack body corresponding to the jack and the shell.

In the technical scheme, valve rings are respectively arranged between the ceramic body and the pin fixing seat and between the ceramic body and the fixing panel.

In the technical scheme, one end of the valve ring is hermetically welded with the ceramic body, and the other end of the valve ring is hermetically welded with the contact pin fixing seat or the fixing panel.

In the technical scheme, the contact pin fixing seat is provided with a connecting hole, and a conical connecting surface is arranged in the connecting hole.

In the above technical scheme, the connection hole includes a threaded cylindrical connection section and a conical connection section, and the inner surface of the conical connection section is a smooth plane.

In the technical scheme, the contact pin comprises a threaded connection section and a conical connection surface which are matched with the connection hole, and the conical connection surface is a smooth surface.

In the technical scheme, a plurality of convex-concave alternative petal-shaped structures are uniformly arranged on the inner wall of the jack body along the axis.

In the technical scheme, the metal wire outside the jack body is sleeved on the jack body.

In the above technical scheme, a wiring terminal is arranged between the wire connecting hole on the jack body and the wire.

In the technical scheme, a threaded connection end is arranged in the wire connection hole, a thread is arranged at one end of the wiring terminal, the thread section of the wiring terminal is in threaded connection with the wire connection hole, and the other end of the wiring terminal is connected with the wire through a crimping structure.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

by changing the structure of the plug, the current passing capacity is improved by more than one time under the condition of the same diameter of the contact pin;

according to the invention, the anti-aging capacity of the socket in high-pressure oil is improved by changing the socket structure, and the service life is prolonged by more than 10 years;

the invention adopts the design of a detachable structure, so that the replacement of the contact pin can be completed without discharging oil and dismounting the socket in a high-pressure oil environment, the maintainability of the integral connector is improved, and the maintenance cost is reduced.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a plug construction;

FIG. 2 is a schematic diagram of the construction of the socket;

wherein: 1 is insulating casing, 2 is the jack body, 3 is the threaded connection end, 4 is binding post, 5 is the wire, 6 is fixed mounting panel, 7 is the contact pin, 8, 10 are the valveable ring, 9 is the ceramic body, 11 is the contact pin fixing base, 12 is fastening nut.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The connector comprises a socket and a plug, the service environment of the socket is fixedly immersed in the transformer oil for a long time, the transformer oil has very high temperature rise under the electrified working environment of the connector, and therefore the service life of the material of the socket in oil and the replacement and maintenance of the socket need to be considered.

This embodiment is based on the reality and considers making structural improvement to the socket, as shown in fig. 2, the socket includes fastening nut 12, contact pin fixing base 11, ceramic body 9 and fixed mounting board 6, wherein fastening nut 12 is as an organic whole with hydro-cylinder fixed connection, contact pin fixing base 11 is connected to on fastening nut 12 through threaded connection, be connected with ceramic body 9 between contact pin fixing base 11 and fixed mounting board 6, the airtight space of isolation is inside and outside the ceramic body 9 after the connection, the contact pin is connected to on the contact pin connecting base 11 in the ceramic body 9 through threaded connection's mode. After the whole socket is installed, the part below the fixed mounting plate 6 is completely immersed into the transformer oil, and in the later maintenance process, oil does not need to be discharged and the socket does not need to be disassembled, and the contact pin is directly replaced in the ceramic body 9 in a threaded connection mode.

In this embodiment, there are two improvements to the socket, one is to use the ceramic body 9 to replace the traditional rubber, and the other is the connection mode of the pins. First of all, in the field of electrical, the skilled person knows that ceramic bodies have optimal insulating properties and that they have no alternative position with respect to the insulating effect, in particular during high voltage transmission. However, the ceramic body has a fatal disadvantage in that the ceramic body is very weak and easily broken, and the ceramic body is formed only once and cannot be used for secondary processing. Therefore, in the field of connectors, plastic or rubber is generally used to perform integral one-step molding and injection to complete the outline packaging of the connector. In this embodiment through many times of experiments, after being the tubular structure with ceramic body 9 one shot forming, but the both ends of ceramic body utilize the valve ring to connect, but valve ring 8 is used for being connected with fixed mounting panel 6, but valve ring 10 is used for being connected with contact pin connecting seat 11. But ceramic body 9 with adopt welded form to be connected between the valve ring, but the valve ring is sealed integrated into one piece structure with the ceramic body after the welding, but the other end of valve ring seals respectively and welds on fixed mounting board 6 and contact pin connecting seat 11. The connected ceramic body has a certain allowance of deformation space because the valve ring is provided with a certain allowance, when the connector is in a power-on working state, the ceramic body is expanded outwards due to the high temperature, and the stress of the expansion can be successfully counteracted through the valve ring.

In this embodiment, the fixing manner of the pin is not the conventional fixing connection, because the conventional screw connection hole or rivet hole is a straight hole, the possibility of loosening may occur after the pin is connected and used for a long time, and because the connector operates in a high-current use environment, the fixing manner of the pin is an important factor to be considered for the contact area. In this embodiment, a pin connecting hole is formed in the pin connecting base 11, and the pin connecting hole includes a section of threaded connecting section and a section of contact surface with a tapered structure. The conical structure of the contact pin connecting hole is matched with the connecting end structure of the contact pin. As shown in fig. 2, after the front end of the pin 7 is screwed into the screw coupling hole, the tapered surface of the pin 7 comes into contact with the tapered surface of the coupling hole. When the screw thread is at intermeshing's in-process, the tightening force of screw thread can drive the conical surface of contact pin tightly press on the conical surface of threaded connection hole, has increased the joint strength between contact pin and the contact pin connecting seat, and the conical surface can increase the area of contact between contact pin and the contact pin connecting seat.

The plug matched with the socket generally comprises a shell and a jack body, wherein the jack body is provided with a wire connecting hole and a jack, the jack is connected with a contact pin of the socket, and the wire connecting hole is used for connecting a wire. In the traditional way, the wire is generally extruded into the connecting hole of the jack body in an extrusion mode for the connection of the wire, the connection mode is very practical, but because the connector is used in a high-voltage high-current environment, when the jack body is maintained, the wire end after being taken down needs to be deformed due to extrusion, the deformed wire cannot be used for the second time due to the change of the physical form of the deformed wire, the connecting end part needs to be replaced, but the wire replacement is obviously impossible in practical application, the wire can only be repaired, the wire is repaired on the premise that the wire needs to have enough allowance during initial installation, the wire after being repaired can meet the use requirement, but the construction scheme can increase the difficulty of electrical construction.

As shown in fig. 1, the embodiment improves on this situation, a threaded connection end 3 is arranged in a wire connection hole on the jack body 2, the end of a wire 5 is fixedly connected with a connection terminal 4, one end of the connection terminal 4 is provided with a threaded structure, when the jack body 2 is connected, the threaded structure of the connection terminal is in threaded connection with the threaded connection end 3 in the wire connection hole, when the replacement is needed, the wire and the connection terminal are directly taken out of the jack body together, secondary processing on the wire is not needed, and the electrical performance of the wire is not affected.

For the jacks on the jack body, the traditional connection method adopts an inner cylindrical structure, and the wall surfaces are all smooth surfaces. In theory, the contact area between smooth walls is the largest when the cylinders are of uniform diameter. However, in practical experiments, it is found that tolerance occurs between the pin and the socket due to our machining process, a position offset occurs between the pin and the socket due to uneven stress during the connection process, and particularly, displacement occurs between the pin and the socket due to external vibration after connection. These factors in reality all can lead to the area of contact between contact pin and the jack to reduce, consequently in order to ensure the biggest increase current throughput in effectual area of contact, this embodiment splits jack inner wall into a plurality of lamellas, is provided with concave-convex structure on each lamella, increases the contact surface between contact pin and the jack through lamella column structure.

In theory, the contact between the contact pin and the jack is only at the tangent position of each lobe on the jack and the contact pin, so that the more the number of the lobes is, the more the contact points are, and the larger the contact area is; however, if the number of the petals is large, the strength of the jack body is reduced, so that the steel wire for reinforcing is arranged on the outer wall of the jack body at the position corresponding to the jack, and the steel wire fixes and reinforces the petals of the jack body. The steel wire is arranged between the jack body and the plug shell and is sleeved on the jack body in a ring mode.

When the contact pin is inserted into the jack body, the petal-shaped jack body provides a large enough elastic acting force for the contact pin under the action force of the steel wire, after the contact pin and the hole deflect at an angle, the contact pin and the jack can be calibrated through the tightening force of the steel wire, and the contact pin and the jack can be kept in comprehensive contact all the time. Experiments show that the mode effectively increases the contact points of the jack body and the contact pins by increasing the grooves under the condition of meeting the strength of the jack body, correspondingly increases the contact area, improves the current passing capacity, and can improve the current passing capacity by more than one time under the same diameter of the contact pin.

The plug and the socket of the embodiment need to be periodically overhauled after being used for a long time, the plug hole body and the contact pin are designed into detachable structures, and a cable on the plug is connected to a wiring terminal in a pressing mode and is fastened to the plug hole body through the threaded connection end. The contact pin on the socket passes through the screw-thread fastening to the contact pin fixing base, when the maintenance or electrical fault appear, can directly dismantle jack body, contact pin from plug, socket, especially the socket submergence in transformer oil, dismantles the contact pin and need not dismantle whole socket, improves maintenance efficiency by a wide margin, reduces cost of maintenance.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims

1. The utility model provides an electric connector for traction transformer, includes socket and plug, its characterized in that:

2. The electrical connector as recited in claim 1, wherein a valve ring is disposed between the ceramic body and the pin fixing base, and between the ceramic body and the fixing panel.

3. The electrical connector for traction transformer as recited in claim 2, wherein one end of said valve ring is hermetically welded to the ceramic body, and the other end of the valve ring is hermetically welded to the pin holder or the fixing panel.

4. The electrical connector as claimed in claim 1, wherein the pin holder is provided with a connection hole, and a tapered connection surface is provided in the connection hole.

5. The electrical connector for traction transformer as defined in claim 4, wherein said connection hole comprises a threaded cylindrical connection section and a tapered connection section, and the inner surface of said tapered connection section is a smooth plane.

6. The electrical connector for a traction transformer as recited in claim 4 or 5, wherein the pin comprises a threaded connection section and a tapered connection surface, the threaded connection section and the tapered connection surface being matched with the connection hole, and the tapered connection surface is a smooth surface.

7. The electrical connector for the traction transformer as recited in claim 1, wherein a plurality of convex-concave petal-shaped structures are uniformly arranged on the inner wall of the jack body along the axis.

8. An electrical connector for a traction transformer as claimed in claim 1 or claim 7, wherein the wire external to the receptacle is threaded over the receptacle.

9. The electrical connector for a traction transformer as recited in claim 1, wherein a terminal is disposed between the wire connection hole of the socket body and the wire.

10. The electrical connector for the traction transformer as recited in claim 9, wherein a threaded connection end is provided in the wire connection hole, one end of the connection terminal is provided with a thread, the thread section of the connection terminal is in threaded connection with the wire connection hole, and the other end of the connection terminal is connected with the wire by a crimping structure.