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CN-224229393-U - Two-way proportional throttle valve

CN224229393UCN 224229393 UCN224229393 UCN 224229393UCN-224229393-U

Abstract

The invention relates to a two-way proportional throttle valve, which comprises a main valve, a cover plate and a threaded cartridge valve, wherein the main valve comprises a main valve seat with a valve cavity and a valve cover fixed with one end of the main valve seat, the cover plate is arranged at one end of the valve cover away from the main valve seat, the threaded cartridge valve is arranged on the cover plate, a main valve core for controlling a passage between an oil inlet and an oil outlet is arranged in the valve cavity, a pilot oil passage arranged in the cover plate is communicated with a control cavity arranged on the valve cover through a communication oil passage, one end of the pilot oil passage is a pilot oil inlet, the other end of the pilot oil passage is an oil return opening, the threaded cartridge valve comprises a pilot valve seat, a pilot valve core and a pilot valve cavity, the pilot valve core is matched with the pilot valve cavity, and the main valve core moves in the valve cavity under the action of pressure difference of the control cavity and the oil inlet through displacement. The high-flow valve utilizes the proportional control of the low flow through the threaded cartridge valve to control the high flow through the main valve core, so that the product has compact structure, quick dynamic response and stable performance.

Inventors

  • MA CHAO
  • CUI SHI
  • FAN YIBIN
  • LI DEMIN
  • YU XIAORUI
  • YANG XIAODONG
  • ZHU HONGYAN

Assignees

  • 北京华德液压工业集团有限责任公司

Dates

Publication Date
20260512
Application Date
20250521

Claims (10)

  1. 1. A two-way proportional throttle valve, comprising: The main valve (1) comprises a main valve seat (11) with a valve cavity and a valve cover (2) fixed with one end of the main valve seat (11), wherein a main valve core (12) for controlling a passage between an oil inlet and an oil outlet is arranged in the valve cavity, and a control cavity (21) communicated with a rodless cavity (13) is arranged on the valve cover (2); A cover plate (3), wherein the cover plate (3) is arranged at one end of the valve cover (2) far away from the main valve seat (11), a pilot oil duct (31) is arranged in the cover plate (3), one end of the pilot oil duct (31) is configured as a pilot oil inlet (311), and the other end of the pilot oil duct is configured as an oil return port (312), and a part of the pilot oil duct (31) between the pilot oil inlet (311) and the oil return port (312) is configured to extend towards the direction of the valve cover (2) to form a communication oil duct (313) communicated with the control cavity (21); A threaded cartridge valve (4), the threaded cartridge valve (4) being mounted on the cover plate (3), the threaded cartridge valve (4) comprising a pilot valve seat (41) and a pilot spool (42), a pilot valve cavity being formed in the pilot oil passage (31) at a position between the oil return port (312) and the communication oil passage (313), the pilot spool (42) being fitted to the pilot valve cavity and being configured to regulate the oil pressure of the control chamber (21) by displacement; The main valve element (12) is configured to move under the pressure difference of the control cavity (21) and the oil inlet so as to adjust the position of the main valve element (12) in the valve cavity.
  2. 2. The two-way proportional throttle valve as claimed in claim 1, wherein the main spool (12) is provided with a closed end and an open end with a groove, the open end being configured to face the rodless chamber (13), the closed end being configured to control the opening of the oil inlet in cooperation with the main valve seat (11).
  3. 3. The two-way proportional throttle valve as claimed in claim 2, wherein a return spring (14) is provided in the main spool (12), one end of the return spring (14) is configured to abut in a groove of an open end, the other end extends out of the open end and abuts against the valve cover (2), and the return spring (14) is configured to provide an elastic force for the main spool (12) to move toward the oil inlet.
  4. 4. The two-way proportional throttle valve according to claim 2, characterized in that the recess, the rodless chamber (13), the control chamber (21) are configured as a coaxial arrangement.
  5. 5. The two-way proportional throttle valve of claim 1, wherein the threaded cartridge valve (4) further comprises an armature (44) connected to the pilot spool (42) by a pushrod (43), and a coil (45) sleeved outside the armature (44), the coil (45) being configured to displace the pilot spool (42) by the armature (44) upon receiving a control signal.
  6. 6. The two-way proportional throttle valve as claimed in claim 5, characterized in that an elastic means (46) is provided on the pilot spool (42), the elastic means (46) being configured to provide an elastic force to the pilot spool (42) in a direction to seal the pilot valve chamber.
  7. 7. The two-way proportional throttle valve according to claim 5, wherein the armature (44) is configured to close a passage from the pilot oil passage (31) to the oil return port (312) by the pilot spool (42) in a power-off state, and the main spool (12) is configured to be in a state of closing the oil inlet by a pressure difference between the oil inlet and the control chamber (21).
  8. 8. The two-way proportional throttle valve according to claim 1, characterized in that a plurality of damping holes (314) are provided in the pilot oil passage (31) at positions between the communication oil passage (313) and the pilot oil inlet (311), and that pilot oil is configured to flow in the pilot oil passage (31) through the damping holes (314) after entering from the pilot oil inlet (311).
  9. 9. The two-way proportional throttle valve according to claim 1, characterized in that the pilot oil inlet (311) and the oil return (312) are arranged on the same side of the cover plate (3).
  10. 10. The two-way proportional throttle valve of claim 1, wherein the outer circumferential surface of the main spool (12) is provided with at least one annular seal groove (121), the seal ring being configured to nest within the annular seal groove (121) and being configured to slidingly seal with the valve chamber.

Description

Two-way proportional throttle valve Technical Field The disclosure relates to the technical field of throttle valves, in particular to a two-way proportional throttle valve. Background In the existing throttle valve, in order to accurately control the position of a valve core, accurate adjustment of flow is realized, and a displacement sensor is generally integrated in the throttle valve. However, the presence of the displacement sensor not only increases the hardware cost of the system, but also complicates the control circuitry of the system, and once the control loop of the position sensor fails, the throttle valve loses continuous control. Disclosure of utility model The present disclosure provides the following technical solutions for solving the problems existing in the prior art: A two-way proportional throttle valve comprising: The main valve comprises a main valve seat with a valve cavity, a valve cover fixed with one end of the main valve seat, a main valve core arranged in the valve cavity and used for controlling a passage between an oil inlet and an oil outlet, wherein a control cavity communicated with a rodless cavity is arranged on the valve cover; The valve cover is arranged at one end of the valve cover, which is far away from the main valve seat, a pilot oil duct is arranged in the valve cover, one end of the pilot oil duct is configured as a pilot oil inlet, and the other end of the pilot oil duct is configured as an oil return port; The threaded cartridge valve is mounted on the cover plate, the threaded cartridge valve comprises a pilot valve seat and a pilot valve core, a pilot valve cavity is formed in a position between the oil return port and the communication oil duct in the pilot oil duct, and the pilot valve core is matched with the pilot valve cavity and is configured to regulate the oil pressure of the control cavity through displacement; The main valve core is configured to move under the pressure difference effect of the control cavity and the oil inlet so as to adjust the position of the main valve core in the valve cavity. In one embodiment of the present disclosure, the main spool is provided with a closed end configured to face the rodless cavity and an open end having a groove, the closed end being configured to control the opening of the oil inlet in cooperation with the main valve seat. In one embodiment of the present disclosure, a return spring is disposed within the main spool, one end of the return spring is configured to abut within a groove of the open end, the other end extends out of the open end and abuts the valve cover, and the return spring is configured to provide an elastic force to the main spool that moves toward the oil inlet. In one embodiment of the present disclosure, the recess, rodless cavity, control cavity are configured in a coaxial arrangement. In one embodiment of the disclosure, the threaded cartridge valve further includes an armature connected to the pilot valve core by a push rod, and a coil sleeved outside the armature, the coil being configured to displace the pilot valve core by the armature after receiving a control signal. In one embodiment of the present disclosure, an elastic means is provided on the pilot spool, the elastic means being configured to provide an elastic force to the pilot spool in a direction to seal the pilot valve chamber. In one embodiment of the present disclosure, the armature is configured to close a passage between the pilot oil passage and the oil return port in a power-off state, and the main valve spool is configured to be in a state of closing the oil inlet under a pressure difference of the oil inlet and the control chamber. In one embodiment of the present disclosure, a plurality of damping holes are provided in the pilot oil passage at a position between the communication oil passage and the pilot oil inlet, and the pilot oil is configured to flow in the pilot oil passage through the damping holes after entering from the pilot oil inlet. In one embodiment of the disclosure, the pilot oil inlet and the oil return are provided on the same side of the cover plate. In one embodiment of the present disclosure, the outer circumferential surface of the main spool is provided with at least one annular seal groove, and a seal ring is configured to nest within the annular seal groove and is configured to slidingly seal with the valve cavity. According to the two-way proportional throttle valve disclosed by the invention, the threaded cartridge valve is used as the pilot valve to control the pressure of pilot oil in the pilot oil duct, and as the pilot oil duct is communicated with the upper end of the main valve core through the control cavity of the valve cover and working oil enters from the oil inlet at the lower end of the main valve core, the main valve core moves under the action of the pressure difference of the control cavity and the oil inlet, so that the flow of the working oil is continuously and pro