A hydraulic testing machine for engine assembly testing and its application method

Abstract

The invention provides a hydrostatic testing machine for engine assembly detection and an application method. The testing machine comprises a water tank, wherein the water tank is connected with a liquid supplementing circulation circuit, an exhaust circuit, a supplementary step-down circuit, a cooling liquid collection circuit, and a hydraulic pressure test circuit; the water tank is sequentiallyconnected with a first heat pump, a first water filter, a temperature transmitter, a first pressure transmitter, a first pressure regulating valve and an air cooling radiator to form the liquid supplementing circulation circuit; and a second water filter is sequentially connected with a first pressure gauge, a second heat pump, a heat exchanger, a temperature sensor, a third electromagnetic valve, a second temperature transmitter, a first manual ball valve, an engine / engine component, a second manual ball valve, a third temperature transmitter and a fourth electromagnetic valve to form the hydraulic pressure test circuit. The invention provides a set of reliable detection means for the quality control of the sealing performance of engine products, so that any cooling waterway sealing performance detection including the engine and the engine component can be realized, and the detection structure is high in accuracy and short in test time.

Description

technical field [0001] The invention belongs to the technical field of engine assembly, and in particular relates to a hydraulic testing machine for engine assembly detection and an application method. Background technique [0002] Engine sealing inspection is an important quality control process for the factory inspection after the engine assembly assembly. The purpose is to check the sealing performance of the engine cooling system to ensure that there will be no mutual intrusion between the cooling system and the lubrication system, and the cooling and fuel systems during engine operation. Guarantee the factory quality of the engine. However, some core components in the engine system, such as fuel injectors, cylinder liners, and cooling water pumps, are isolated from the engine cooling system by sealing rubber rings. When the process is not completely stable at the initial stage of design, due to changes in component assembly, material properties, or tolerances, parts ins...

AI Technical Summary

Problems solved by technology

Because this method uses two media, air and water, the air density and water density change are inconsistent under the temperature change, and the amount of cooling water and air injected each time cannot be absolutely controlled, thus introducing two disadvantages of the water injection pressurization method When the test time is short, it is not sensitive to micro-leakage parts. When the test time is long, the different air pressure rise and fall factors introduced by the change of air density are included in the test pressure, so the product quality control is not strict.

And some special seals also need to check the temperature adaptability, and the water injection and pressurization method cannot heat the coolant in the cooling system

At the same time, due to the subjective factors of personnel introduced by the water injection pressurization method, effective process control cannot be carried out.

After the test, the sealing problem of the cooling system cannot be found in advance in a stable manner. In some newly developed models, failures caused by leakage often occur, thus increasing the cost of trial production after repeated installation and testing

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