Nine processing methods for repairing mechanical failures of vane pumps

The overall inspection of the equipment is a comprehensive quality appraisal after the vane pump mechanical equipment is repaired, and it is an important link to ensure that the vane pump mechanical equipment has good performance, safety and reliability after delivery. The overall inspection includes steps such as no-load test run, load test run and post-test run inspection. Pressure test and tightness test are also required for important equipment. The elimination of human-induced vane pump failures is mainly achieved by improving the quality of use, management, and maintenance personnel and strengthening the sense of responsibility. For natural failures, it can only be achieved by adjusting and repairing the vane pump. Usually, there are the following methods:

First check the connection, fastening, lubrication, sealing, operation of each part, test the operation and function of the control system, adjustment control system, and safety devices, and make appropriate adjustments. At the same time, check whether the indications of various instruments meet the specified standards. If the assembly performance test has not been carried out, the test run shall be carried out in sections, and the load test shall not be carried out until the faults found in the test run, abnormal sound, temperature rise, jumping, etc. are eliminated.

1. The main repair method to restore the matching properties of the vane pump

(1) Adjustment method: Generally, the original matching relationship of the fittings is restored by adjusting the tightness of the bolts or the thickness of the gaskets. When repairing, it is not necessary to process (or only scrape) the fittings, but only to add gaskets or The method of adjusting the thickness of the gasket makes it return to the original fit clearance.

(2) Repair size method: during repair, the parts of the vane pump are machined to restore their geometric shape, and a new size is obtained at the same time, and then another worn part in the matching part is discarded and replaced with a new and processed one. The matching parts of the parts, so that the matching clearance of the matching parts is restored to the initial clearance, such as repairing the shaft and replacing the bearing bush, repairing the cylinder liner and replacing the piston, etc. This vane pump repair method should consider the possibility of parts that can be processed on the structure and the mechanical strength of the vane pump after the parts are repaired. Under this premise, the number of repairs should be increased as much as possible; on the other hand, in order to facilitate the supply of spare parts, the repair size should be Be standardized.

(3) Supplementary parts method (additional parts method): The vane pump method processes and shapes each part of the mating parts, and gives a reasonable diameter reduction or expansion to one of the parts, and then adds a same material to it. Or a higher-quality bushing, which is press-fitted or threaded or welded to the original part, and then processed to the matching size to make the matching properties meet the requirements.