Design idea of high voltage push pull self locking connector
Categories: Industry news
Time of issue:2021-09-15
The design of push-pull self-locking connector has special requirements for the insertion interface and wire termination. When the voltage is high, the dielectric withstand voltage and creepage distance have new significance. In the trend of miniaturization of push-pull self-locking connector structure, the size of push-pull self-locking connector is becoming smaller and smaller, and the distance between contacts and the shell is very small, so special structure must be used to increase its creepage distance. The mounting plate of high-pressure push-pull self-locking connector shall be designed to be in the shape of 'conical platform' and corresponding 'conical hole' which can fix the contact, and at least one mounting plate shall be made of silicone rubber. This structure increases the creepage distance between the contacts, and due to the existence of the cone surface, the whole fitting surface can exert equal pressure. Under the action of a certain interface pressure, the soft mounting plate can produce a certain amount of compression, and the sealing structure is added on the soft mounting plate, so as to eliminate the air gap connection between the electrodes more effectively and achieve the purpose of eliminating the air gap on the interface. The compression amount of the soft mounting plate is controlled by the combination of 'cone table, hole', connecting sleeve and corrugated spring.
The overall structure design of push-pull self-locking connector is as follows:
Fixed end electric push-pull self-locking connector and free end electric push-pull self-locking connector are composed of contact parts, insulation mounting plate, shell and tail accessories. The pin contacts are installed in the push-pull self-locking connector at the free end, and the mounting plate is made of silicone rubber with good dielectric strength and elasticity; the jack contact component is installed in the fixed end push-pull self-locking connector, and the mounting plate is made of hard insulating material. In order to prevent misinsertion, the free end electric push-pull self-locking connector shell and the fixed end electric push-pull self-locking connector shell are designed with five keyways; In order to achieve the purpose of rapid separation, the shell of the push-pull self-locking connector at the free end is equipped with a connecting sleeve. On the inner hole wall of the connecting sleeve, there are three bayonet spiral grooves with the spiral structure of equal pitch. At the bottom of the bayonet groove, there is a pin through-hole, which can observe the engagement of the push-pull self-locking connector; Correspondingly, there are three pins on the surface of the fixed push-pull self-locking connector shell, which can be rotated to the bottom of the spiral groove. After the electric push-pull self-locking connector at the free end is screwed in place, the push-pull self-locking connector can be locked. On the push-pull self-locking connector at the free end, rotate the connecting sleeve clockwise to complete the connection and counterclockwise to complete the separation. When the push-pull self-locking connector is fully engaged and the connecting sleeve is in the locking position, the pin end can be seen through the corresponding hole on the connecting sleeve.
The design of four core high-pressure push-pull self-locking connector should keep constant interface pressure during use. The method to accomplish this task is to adopt locking mechanism. In order to prevent harmful gases, moisture, salt fog, water from entering into the push-pull self-locking connector, and improve the service life and reliability of the push-pull self-locking connector, the five key slot is used to complete the positioning of the push-pull self-locking connector, and the free end electric push-pull self-locking connector is connected to the fixed end electric push-pull self-locking connector with a connecting sleeve.
Design of inserting interface of push pull self locking connector
In order to meet the high-voltage performance requirements of push-pull self-locking connector, its mounting plate must be designed to be different from the general push-pull self-locking connector. On the inserting interface of push-pull self-locking connector, the free end adopts silicone rubber soft mounting plate, which is designed as a concave 'conical hole' structure to fix the contact of the pin; the fixed end adopts DAP hard mounting plate, which is designed as a convex 'cone table' structure to fix the jack contact.
Wire seal of push pull self-locking connector
The wire seal includes free end push-pull self-locking connector and fixed end push-pull self-locking connector wire seal. For the wire with fluoroplastics, in order to make the wire bond firmly, the bonding part of the wire must be sandblasted to make its surface rough, and then use strong oxidizing agent to corrode the wire. During the corrosion process, the molecules on the surface of the conductor react to form a free radical carbon film, which reacts with the sealing adhesive to form a true chemical bond.
When the wire is welded with the contact, the area of the solder joint should be small and flush with the surface of the contact. On the one hand, it can avoid damaging the coating on the contact surface due to the large area of the solder joint, on the other hand, it can also avoid the tip discharge caused by the protrusion or depression of the solder joint, and it is easy to cause gas adsorption to form 'air pump' during molding
In the push-pull self-locking connector at the free end, the treated wire is coated with a layer of silicone rubber adhesive after welding with the contact, and then it is sent into the silicone rubber soft mounting plate with a special tool, and then the hard mounting plate is pressed by the connecting nut to support the soft mounting plate and wire.
In the fixed push-pull self-locking connector, there are two problems to be solved, one is the creepage distance on the interface, the other is the wire sealing. As shown in Fig. 5, the same processing method can solve the above problems.
When the high-voltage push-pull self-locking connector is potted, the contact between the contact and the cable must be bonded with their insulation mounting plate, and the insulator must be bonded with the shell of the push-pull self-locking connector. Before the contact is inserted into the insulation mounting plate, the adhesive must be used, and then the epoxy resin or silicon sealing compound shall be used to seal the tail of the fixed push-pull self-locking connector and the free end push-pull self-locking connector. The contact shall be placed in a vacuum container with heating device for exhaust until the gas is removed, and it shall be kept at a suitable temperature for a certain time to solidify. Generally speaking, encapsulation is what users need to do when using it.
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