Electro-hydraulic servo valve for prestage independent type jet flow pipe

Abstract

The invention relates to an electro-hydraulic servo valve for a prestage independent type jet flow pipe, which mainly solves the technical problems of the improvement of the manufacturability of the electro-hydraulic servo valve, and the like. The electro-hydraulic servo valve adopts the technical scheme that the prestage jet flow pipe is provided with a switching block; the bottom surface of the switching block is connected with a main valve; the top surface of the switching block is connected with a torque motor; a receptor is fixed in an installing hole of the middle part of the switching block; a position adjacent to the bottom surface of the switching block is provided with a left oil hole and a right oil hole; one end of the left oil hole and one end of the right oil hole are connected with a left guide hole and a right hole of the main valve respectively; and the other end of the left oil hole and the other end of the right oil hole are communicated with a left receiving hole and a right receiving hole of the receptor respectively. The electro-hydraulic servo valve for the prestage independent type jet flow pipe is suitable for various electro-hydraulic servo valves for the prestage jet flow pipe.

Description

Technical field: [0001] The invention relates to a valve, in particular to a jet tube type two-stage electro-hydraulic servo valve. Background technique: [0002] The existing jet tube type force feedback two-stage electro-hydraulic servo valve includes a torque motor, a jet tube and a power stage main slide valve. The receiver is set on the valve sleeve of the main valve of the servo valve. When the hydraulic oil enters the servo valve, it enters the jet tube through the high-pressure oil pipe, and sprays to the two receiving holes on the receiver through the shrinking nozzle at the port of the jet tube. A receiving hole is connected to the long oil delivery hole opened on the valve sleeve, and the long hole introduces the received oil into both ends of the control valve core; when the torque motor has no control current input, the nozzle of the jet tube is in the middle position, and the two ends of the receiver The jet kinetic energy received by the receiving hole from t...

AI Technical Summary

Problems solved by technology

[0003] 1. The receiver of the split jet tube structure is installed on the valve sleeve. The feature of this structure is that a long hole corresponding to the two receiving holes is drilled on the valve sleeve, and the long hole must be aligned with the receiver hole. The long hole is characterized by a small diameter and a large length, so it is extremely difficult in actual processing. If the processing deviation is too large, the receiver hole and the long hole on the valve sleeve cannot communicate, and the part will be scrapped, and the unavoidable small amount The error will make the flow area between the receiver hole and the long hole on the valve sleeve insufficient, affect the recovery efficiency of the pre-stage, and make it difficult to guarantee the quality of existing products;

[0004] 2. During the assembly and debugging process of the electro-hydraulic servo, due to the split structure, there are factors of mutual interference in the zero adjustment of the torque motor, nozzle and valve core, which greatly increases the difficulty of debugging;

[0005] 3. During maintenance, if the servo valve produces zero deviation, the zero adjustment of the torque motor, nozzle and valve core will also affect each other, making it difficult for the operator to judge the cause of the fault, which will greatly increase the maintenance workload;

[0006]4. The feedback rods of the existing electro-hydraulic servo valves all adopt curved rod structure, which is not only difficult to process, but also has poor load-bearing conditions

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