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CN-116550494-B - Rotary direct-drive type multi-nozzle jet electrohydraulic servo valve

CN116550494BCN 116550494 BCN116550494 BCN 116550494BCN-116550494-B

Abstract

The invention provides a rotary direct-drive type multi-nozzle jet electrohydraulic servo valve, and belongs to the technical field of electrohydraulic control. The rotary direct-drive type multi-nozzle jet electrohydraulic servo valve comprises a valve body, a rotary valve core and a servo motor, wherein four jet nozzles which are communicated with an internal oil duct and used for injecting oil are arranged on the rotary valve core, four receiving holes are arranged on the inner wall of the valve body, each receiving hole is communicated with a corresponding control oil duct and corresponds to the jet nozzles one by one, two receiving holes are positioned at the front side of the corresponding oil injection structure in the rotation direction when the rotary direct-drive type multi-nozzle jet electrohydraulic servo valve is used, and two receiving holes are positioned at the rear side of the corresponding oil injection structure in the rotation direction. The electrohydraulic servo valve designed by the invention has the remarkable characteristics of simple structure, high efficiency, low processing cost, strong pollution resistance, high reliability, convenient maintenance and application and the like.

Inventors

  • LI YUESONG
  • ZHANG YIZHE
  • WANG BANG
  • LI GUIFEI

Assignees

  • 河南科技大学

Dates

Publication Date
20260508
Application Date
20230512

Claims (10)

  1. 1. The rotary direct-drive type multi-nozzle jet electrohydraulic servo valve is characterized by comprising a valve body (7), a rotary valve core (6) which is arranged in the valve body (7) and provided with an internal oil duct, and a rotary power source which is arranged on the valve body (7) and is in transmission connection with the rotary valve core (6) to control the rotation angle of the rotary valve core (6); the rotary valve core is provided with a communication structure for communicating the internal oil passage and the oil inlet passage and an even number of oil injection structures communicated with the internal oil passage and used for injecting oil, a distance is reserved between the oil injection structures and the inner wall of the valve body, high-pressure hydraulic oil flows into the internal oil passage through the oil inlet passage and is sprayed out through all the oil injection structures when in use, an oil return passage communicated with the inner cavity of the valve body is arranged at the bottom of the valve body, receiving holes which are communicated with the corresponding control oil passage and are in one-to-one correspondence with the oil injection structures are arranged on the inner wall of the valve body (7), each receiving hole is not concentric with the axis of the corresponding oil injection structure, but at least one receiving hole is positioned at the front side of the corresponding oil injection structure in the rotary direction when in use, and at least one receiving hole is positioned at the rear side of the corresponding oil injection structure in the rotary direction when the rotary valve core rotates by a certain angle, the overlapping area of the front side of the rotary direction and the corresponding oil injection structure is increased, and the overlapping area of the rear side of the rotary direction and the corresponding oil injection structure is reduced, and the overlapping area of each receiving hole is identical with the corresponding oil injection structure in the middle position.
  2. 2. The rotary direct-drive multi-nozzle jet electrohydraulic servo valve of claim 1 wherein a receiving hole at a front side in a rotation direction of the oil injection structure is defined as a front receiving hole, a receiving hole at a rear side in the rotation direction of the oil injection structure is defined as a rear receiving hole, at least two control oil passages corresponding to the at least two front receiving holes are respectively provided in the front receiving hole and the rear receiving hole, and are communicated through a first connecting oil passage (18), and control oil passages corresponding to the at least two rear receiving holes are communicated through a second connecting oil passage (19).
  3. 3. The rotary direct-drive type multi-nozzle jet electrohydraulic servo valve of claim 2 wherein said valve body (7) includes a plate body (7-1) and an annular body (7-2) connected to said plate body (7-1), said control oil passage is located in said plate body (7-1) and said annular body (7-2), said first connecting oil passage (18) and said second connecting oil passage (19) are both provided in said plate body (7-1), and said first connecting oil passage (18) and said second connecting oil passage (19) each include at least one straight oil passage.
  4. 4. The rotary direct-drive multi-nozzle jet electrohydraulic servo valve of any of claims 1 to 3 wherein each receiving hole and each oil injection structure are uniformly distributed circumferentially.
  5. 5. The rotary direct-drive type multi-nozzle jet electrohydraulic servo valve of claim 4 wherein the number of said receiving holes and said oil injecting structures is four, said internal oil passage (3) includes a cross-shaped oil passage (3-1) and a central oil passage (3-2) communicating with the center of said cross-shaped oil passage (3-1), said four oil injecting structures are located at the outlet of said cross-shaped oil passage (3-1), respectively, said communicating structures are located at the end of said central oil passage (3-2).
  6. 6. The rotary direct-drive type multi-nozzle jet electrohydraulic servo valve of any one of claims 1 to 3, characterized in that said oil injection structure is a jet nozzle installed on a rotary valve core (6), and the distance between the jet nozzle and the inner wall of the valve body (7) is 1 to 2 times the diameter of the jet nozzle.
  7. 7. The rotary direct-drive multi-nozzle jet electrohydraulic servo valve of any one of claims 1 to 3, characterized in that said oil injection structure is a jet nozzle mounted on a rotary valve core (6), and the orifice receiving area of the receiving hole is 1 to 3 times the orifice area of the jet nozzle.
  8. 8. A rotary direct-drive multi-nozzle jet electrohydraulic servo valve according to any of claims 1 to 3, characterized in that said communicating structure is a communicating pipe (8) with one end fixedly connected with the rotary valve core (6) and the other end extending into the oil inlet channel (25) of the valve body (7) and sealing-fitted with the oil inlet channel (25).
  9. 9. A rotary direct-drive multi-nozzle jet electrohydraulic servo valve according to any of claims 1 to 3, characterized in that one end of the valve body (7) is an open end, and the rotary power source is mounted at the open end of the valve body (7) and encloses a chamber (10) provided with the rotary valve core (6) together with the valve body (7).
  10. 10. The rotary direct-drive multi-nozzle jet electrohydraulic servo valve of any of claims 1 to 3 wherein said rotary power source is a servo motor.

Description

Rotary direct-drive type multi-nozzle jet electrohydraulic servo valve Technical Field The invention relates to a rotary direct-drive type multi-nozzle jet electrohydraulic servo valve, and belongs to the technical field of electrohydraulic control. Background The electrohydraulic servo valve is a core control element of an electrohydraulic servo control system, plays a role of connecting an electric part and a hydraulic part, is not only an electrohydraulic conversion element, but also a power amplifying element, and has the function of converting a low-power electric signal into a high-power hydraulic energy which is related to the polarity of a control signal, thereby realizing the control of displacement (or rotating speed), speed (or angular velocity), acceleration (or angular acceleration) and force (or torque) of a hydraulic actuator. Therefore, the performance of the electrohydraulic servo valve is directly related to the control precision and response speed of the whole electrohydraulic servo system, and the reliability and service life of the system are also directly influenced. At present, the electrohydraulic servo valves mainly can be divided into direct-drive electrohydraulic servo valves, rotary direct-drive electrohydraulic servo valves, double-nozzle baffle electrohydraulic servo valves, jet pipe electrohydraulic servo valves, bias-conduction jet electrohydraulic servo valves and the like according to structural types. Wherein, the anti-pollution performance of jet pipe electrohydraulic servo valve and bias conductive jet electrohydraulic servo valve is best. The hydraulic amplifier forming the electrohydraulic servo valve mainly comprises a slide valve, a rotary slide valve, a double-nozzle baffle valve, a jet pipe valve and a bias flow guide valve, wherein the jet pipe valve and the bias flow guide valve are usually matched with the slide valve to form a two-stage electrohydraulic servo valve, namely the jet pipe valve and the bias flow guide valve are usually used as a pre-stage of the two-stage electrohydraulic servo valve. For example, chinese patent application publication No. CN108386566a discloses a jet pipe electrohydraulic servo valve (i.e. an electrohydraulic servo valve) adapted to a variable temperature field, in which a jet nozzle and a receiver form a pre-stage of the jet pipe servo valve, the movement of a spool valve is controlled, a torque motor drives the jet pipe to shift after a control current is applied, the energy of two jet receiving holes of the receiver is no longer the same, and the formed pressure difference pushes the spool to move. The electrohydraulic servo valve is a two-stage valve, and the main valve is a slide valve with higher processing precision requirement, so that the structure is complex, the cost is higher, and the jet pipe valve and the bias-conductance jet valve are limited by the carrying capacity of the torque motor, so that the nozzle is smaller, and after the working time is long, the nozzle is easily blocked by impurities such as particles in oil liquid, so that the nozzle cannot work, and the reliability is low. Meanwhile, the two-stage valve is complex in structure, more in fault points and low in reliability. In addition, because the nozzle is smaller, the flow is smaller, meanwhile, the jet nozzle is positioned at the middle position of the two receiving holes, a large amount of oil from the jet nozzle cannot flow into the receiving holes, the middle position leakage flow is larger, the energy utilization rate is low, and the jet nozzle is usually only used as the first stage of the two-stage electrohydraulic servo valve. Disclosure of Invention The invention aims to provide a rotary direct-drive type multi-nozzle jet electrohydraulic servo valve, which aims to solve the problems that the existing jet pipe valve and the existing partial guide jet valve are small in flow, a two-stage electrohydraulic servo valve is usually formed by matching with a slide valve, and the two-stage electrohydraulic servo valve has the advantages of complex structure, high cost and low reliability. In order to achieve the purpose, the rotary direct-drive type multi-nozzle jet electro-hydraulic servo valve adopts the following technical scheme: The rotary direct-driven multi-nozzle jet electrohydraulic servo valve comprises a valve body, a rotary valve core arranged in the valve body, and a rotary power source which is arranged on the valve body and is in transmission connection with the rotary valve core to control the rotation angle of the rotary valve core, wherein an oil inlet channel and at least two control oil channels are arranged on the valve body, an internal oil channel is arranged in the rotary valve core, a communication structure which is communicated with the internal oil channel and the oil inlet channel is arranged on the rotary valve core, at least two oil injection structures which are communicated with the internal oil channel and are used