Border area coolant flow adjusting device for injector

The invention discloses a border area coolant flow adjusting device for an injector. The border area coolant flow adjusting device mainly comprises a central cylinder, an injector shell arranged outside the central cylinder, a movable adjusting rod installed inside the central cylinder and a plug installed at one end of the central cylinder. A locking pad and a locking nut are arranged on the adjusting rod; and sealing gaskets are arranged between the central cylinder and the end of the shell and between the central cylinder and the end of the plug correspondingly. A circular-seam-shaped outer ring coolant channel is formed between the central cylinder and the shell; a coolant flow adjusting area is formed between the central cylinder and the end of the movable adjusting rod; and a plurality of through holes penetrating coolant are formed in the side wall of the central cylinder. According to testing requirements, border area coolant flow can be adjusted through adjusting of movable adjusting rod stroke changes. The border area coolant flow adjusting device for the injector is reasonable in structure, simple to manufacture, convenient to operate and low in cost, and can meet the testing requirements of injector border area flow adjusting.