Pre-tensioning - pre-twisting full-bridge 2D electro-hydraulic proportional directional valve

Abstract

Provided is a pre-tensioning - pre-twisting full-bridge 2D electro-hydraulic proportional directional valve. The two ends of the 2D valve are both connected with linear electro-mechanical converters through pressure-torsion couplings and springs. The cylindrical compression springs are mounted between a valve body and sliding wedges, and the precompression amount is slightly larger than a valve core stroke. A left sensitive cavity and a right sensitive cavity are formed between end portion circular beads and end covers of a valve core and the valve body. The end portion circular beads of the valve core are provided with a pair of high pressure hole and low pressure hole (b and d) and a pair of high pressure hole and low pressure hole (c and e) respectively, and the high pressure holes and the low pressure holes are communicated with a P opening and a T opening respectively through a valve core inner hole. A sensitive channel (f) and a sensitive channel (g) are formed in the two ends of the wall of the valve body inner hole respectively and are communicated with the left sensitive cavity (h) and the right sensitive cavity (j) respectively. The high pressure holes and the low pressure holes in the end portion circular beads intersect with the sensitive channels to form two tiny openings, and are in series connection with the sensitive channels to form hydraulic resistance half bridges. The pressure of the sensitive cavities in the two ends is controlled by the hydraulic resistance half bridges at the two ends respectively.

Description

technical field [0001] The invention belongs to an electro-hydraulic proportional valve in the field of fluid transmission and control, in particular to an electro-hydraulic proportional reversing valve. Background technique [0002] Electro-hydraulic servo control technology organically combines the advantages of fluid transmission control technology and information electronic technology, and has been applied in important national strategic military industrial fields such as aerospace, cutting-edge weapons, steel, and electric power generation, and has achieved rapid success. However, the electro-hydraulic servo valve also has defects such as poor anti-pollution ability, large pressure loss (7MPa) in the valve, high manufacturing cost and maintenance cost, and large system energy loss. Due to the many defects of the electro-hydraulic servo valve, its fast response performance cannot be widely used in general industrial equipment. At the same time, the traditional electro-h...

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Problems solved by technology

[0009] In order to overcome the existing electro-hydraulic proportional valve's susceptibility to friction, hydraulic power and oil pollution, the phenomenon of "stuck" and the loss of pressure in the oil circuit of the pilot and control stage or the pressure is too low make the entire valve unable to work normally and the pilot and control stage Due to the large leakage flow rate, the present invention provides an ordinary pilot-controlled electro-hydraulic proportional valve that not only has the characteristics of large flow rate and high working pressure, but also can be realized like a direct-acting proportional valve under zero pressure (pressure loss). Pretension-pretwist type full-bridge 2D electro-hydraulic proportional directional valve with proportional control function

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