A four-way hydraulic transformer with shaft distribution structure

Abstract

An axial distribution type four-way hydraulic transformer includes a main shaft, a hydraulic transformer casing, a plunger, a cylinder block, a distribution plate, a transition plate, a distribution shaft housing, a distribution shaft, a rear end cover, a servo motor, and a rotating Gree ring. There are four waist-shaped grooves on the valve plate. The center of the valve plate waist-shaped groove is provided with a flow channel of the valve plate. The inside of the valve shaft has a corresponding valve shaft flow channel. The distributing plate is coaxial with the distributing shaft, and the internal flow channels are connected in turn correspondingly; the distributing shaft is provided with four full-circumferential annular grooves, which are sequentially communicated with the internal distributing shaft flow channels. In the shaft distribution four-way hydraulic transformer of the present invention, the flow area between the distribution shaft and the sleeve is kept constant, and the rotation angle of the distribution plate is not limited by the throttling loss. The distribution groove adopts a full-circumference structure, so that the distribution shaft is subjected to uniform hydraulic force and reduces the axial impact. Coaxial seals are used to isolate the distribution grooves, which improves the overall volumetric efficiency of the hydraulic transformer.

Description

technical field [0001] The invention belongs to the technical field of hydraulic components, in particular to an axial distribution type four-way hydraulic transformer. Background technique [0002] Most of the existing integrated hydraulic transformers have a one-to-one correspondence between the load pressure and the load flow, that is, the flow can not be controlled under a specific load pressure. Therefore, the application of the existing hydraulic transformers is mostly based on the secondary regulation system of the constant voltage network, which cannot be directly It is connected in series into the valve-controlled load system. However, most of the existing construction machinery adopts the valve-controlled load system, which is very mature. Many of them have been made into integrated valve groups and industrial hydraulic pumps that match the specific load. It is difficult to change the structure and process of the existing hydraulic system. . [0003] The new four...

AI Technical Summary

Problems solved by technology

Since there are four distribution oil holes on the flow distribution plate of the four-way hydraulic transformer and each oil hole needs to be supplied with oil separately, it is difficult to arrange the flow channels when the traditional distribution plate and the rear end cover plane friction distribution method are used. When changing the transformation ratio, the flow area between the distribution plate and the rear end cover gradually decreases, resulting in throttling loss, and the rotation angle range is limited, resulting in the limitation of the transformation range of the four-way transformer.

[0004] The existing integrated hydraulic transformer often adopts a plane friction pair flow distribution structure in the cooperation between the distribution plate and the rear end cover. There are multiple large-angle arc-shaped grooves opposite to each other on the two planes. It is difficult to adopt other effective sealing methods, and the leakage is serious; as the rotation angle of the distribution plate increases, the flow area between the distribution plate and the rear end cover gradually decreases, and serious throttling losses will occur, reducing the hydraulic transformer. Efficiency, in order to ensure the effective flow area, the rotation angle range can only be further limited, so the pressure transformation range is small; some rear end covers and distribution plate slots adopt an asymmetric design, and different arc slots are distributed in different positions. In terms of radius, the flow area and rotation range are guaranteed, but the too long arc-shaped groove makes the radial impact force on the distribution plate when the rear end cover enters oil is large, which affects the balance of the distribution plate and increases the friction of the distribution surface. The service life of the hydraulic transformer is reduced; and the existing distribution structure generally has problems such as large volume, large mass, and serious leakage, which need further improvement

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