Pilot-operated type proportional cartridge valve driven by servo motor
A technology of proportional cartridge valve and servo motor, which is applied in the direction of valve operation/release device, lift valve, valve details, etc., which can solve the problem of high oil cleanliness, complex manufacturing process of electro-hydraulic servo valve, and inability to take care of the main valve Core driving force and response speed and other issues to achieve the effect of increasing the maximum working pressure, shortening the step response time, and increasing the maximum working flow
Pending Publication Date: 2020-05-29
ZHEJIANG UNIV
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Problems solved by technology
[0002] Traditional proportional cartridge valves use electro-hydraulic servo valves as the pilot stage. The manufacturing process of electro-hydraulic servo valves is complicated and the cost is high. At the same time, the requirements for oil cleanliness are high, the cost of use is high, and maintenance is difficult, which hinders their wider application.
In addition, the proportional cartridge valve using servo motor and ball screw to directly drive the main spool, although the structure is simplified compared with the traditional proportional cartridge valve, but because the power of the motor is inversely proportional to the response speed, in the application of high pressure and large flow In some cases, the driving force and response speed required by the main spool cannot be considered
Method used
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[0018] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0019] As shown in FIG. 1( a ), a pilot-operated proportional cartridge valve driven by a servo motor 11 includes: a servo motor 11 , a cover plate 1 , a pilot spool 12 , a main spool 35 and a valve sleeve 36 . The servo motor 11 is fixedly installed on the cover plate 1 through the motor base 9 . The cover plate 1 is formed with a mounting hole 4 . One end of the pilot spool 12 passes through the installation hole 4 and is fixedly connected to the output shaft of the servo motor 11 . The other end of the pilot spool 12 is slidably disposed in the inner hole of the main spool 35 in a clearance fit manner. A variable orifice 39 with a variable flow area is formed between the pilot spool 12 and the main spool 35 . The main valve core 35 is slidably disposed in the inner hole of the valve sleeve 36 in a clearance fit manner. The valve sl...
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The invention discloses a pilot-operated type proportional cartridge valve driven by a servo motor. The pilot-operated type proportional cartridge valve comprises the servo motor, a cover plate, a pilot-operated valve element, a main valve element and a valve sleeve. The servo motor drives the pilot-operated valve element to rotate, a hydraulic half bridge formed by a fixed damping hole and a variable damping hole converts the rotating angle of the pilot-operated valve element into the pressure for controlling an oil cavity to drive the main valve element to move, and follow-up control is achieved between the main valve element and the pilot-operated valve element through negative feedback of the hydraulic half bridge. The servo motor drives the pilot-operated valve element only by overcoming small inertia force, friction force and hydraulic unbalance force, and the servo motor with small power is favorably selected. The full-stroke rotation angle of the pilot-operated valve element issmall, and the step response time of the pilot-operated valve element is favorably shortened. The driving force of the main valve element is not limited by the power of the servo motor, the stroke ofthe main valve element is not limited by the stroke of the pilot-operated valve element, and the maximum working pressure and the maximum working flow of the main valve are favorably improved.
Description
technical field [0001] The invention relates to a pilot proportional cartridge valve driven by a servo motor. Background technique [0002] Traditional proportional cartridge valves use electro-hydraulic servo valves as the pilot stage. The manufacturing process of electro-hydraulic servo valves is complicated and the cost is high. At the same time, the requirements for oil cleanliness are high, the cost of use is high, and maintenance is difficult, which hinders their wider application. . In addition, the proportional cartridge valve using servo motor and ball screw to directly drive the main spool, although the structure is simplified compared with the traditional proportional cartridge valve, but because the power of the motor is inversely proportional to the response speed, in the application of high pressure and large flow In some cases, the driving force and response speed required by the main spool cannot be taken into account. Contents of the invention [0003] I...
Claims
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IPC IPC(8): F16K31/383F16K31/42F16K1/00
CPCF16K1/00F16K31/383F16K31/42
Inventor孔晓武王亚南
OwnerZHEJIANG UNIV