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CN-121993451-A - High-pressure high-flow hydraulic cylinder

CN121993451ACN 121993451 ACN121993451 ACN 121993451ACN-121993451-A

Abstract

The invention discloses a high-pressure high-flow hydraulic cylinder, which belongs to the technical field of hydraulic cylinders and comprises a cylinder body and a piston structure, wherein the cylinder body is divided into a high-pressure oil cavity and a rod cavity by the piston structure, the piston structure comprises a first side wall, a second side wall and a third side wall which are sequentially communicated from the high-pressure oil cavity to the rod cavity, a first gap, a second gap and a third gap are respectively formed between the first side wall, the second side wall and the third side wall and the inner wall of the cylinder body, the gap widths of the second gap, the first gap and the third gap are sequentially reduced, a first annular groove is formed on the first side wall, the first annular groove is communicated with the first gap, a third annular groove is formed on the third side wall, one end of the third annular groove is communicated with the third gap, and the other end of the third annular groove is communicated with the high-pressure oil cavity through a high-pressure channel. According to the invention, by arranging the three-section gap between the piston structure and the inner wall of the cylinder body, different effects of oil in different gaps are realized, and the stable movement of the piston structure under the condition of high pressure and large flow rate is ensured.

Inventors

  • ZHANG LIPING
  • XU XINDONG

Assignees

  • 江阴万恒机械制造有限公司

Dates

Publication Date
20260508
Application Date
20251230

Claims (10)

  1. 1. The utility model provides a high-pressure large-traffic hydraulic cylinder, includes cylinder body (1) and piston structure (2), piston structure (2) will cylinder body (1) divide into high-pressure fluid chamber and have pole chamber, a serial communication port, piston structure (2) include follow high-pressure fluid chamber to have pole chamber direction to set gradually first lateral wall (9), second lateral wall (10) and third lateral wall (11), first lateral wall (9), second lateral wall (10) and third lateral wall (11) respectively with form first clearance (16), second clearance (17) and third clearance (18) between cylinder body (1) inner wall, the clearance width in second clearance (17), first clearance (16), third clearance (18) reduces in proper order, set up first (12) on first lateral wall (9), first ring channel (12) with first clearance (16) intercommunication, set up third (14) on third lateral wall (11), third one end with third annular channel (18) high-pressure fluid chamber and high-pressure ring channel intercommunication.
  2. 2. The high-pressure high-flow hydraulic cylinder according to claim 1, wherein the bottom of the piston structure (2) is further provided with a communication hole (19), and the first annular groove (12) is communicated with the high-pressure oil liquid cavity through the communication hole (19).
  3. 3. A high pressure, high flow hydraulic ram as claimed in claim 2, characterised in that the internal volume of the first annular groove (12) is greater than the internal volume of the third annular groove (14).
  4. 4. A high pressure, high flow hydraulic ram as claimed in claim 1, characterised in that the length of the second side wall (10) is greater than the length of the first side wall (9) and the third side wall (11), respectively.
  5. 5. The high-pressure high-flow hydraulic cylinder according to claim 1, wherein the second side wall (10) is provided with a second annular groove (13), the second annular groove (13) is communicated with the second gap (17), and the caliber width of a notch of the second annular groove (13) is larger than the caliber width of the bottom of the groove.
  6. 6. A high pressure high flow hydraulic ram as claimed in claim 5 wherein a plurality of said second annular grooves (13) are provided and are evenly distributed along the length of the second side wall (10).
  7. 7. A high pressure high flow hydraulic cylinder according to claim 1, characterized in that the high pressure channel (15) comprises a plurality of branch channels (20) and a main channel (21) communicating with the branch channels (20), the branch channels (20) communicating with the third annular groove (14), the main channel (21) communicating with the high pressure oil chamber.
  8. 8. The high-pressure high-flow hydraulic cylinder according to claim 7, wherein the branch channels (20) are circumferentially distributed on the main channel (21), the bottom of the main channel (21) connected with the piston structure (2) is provided with a channel port (22), the channel port (22) is provided with a conical structure, and one end close to the high-pressure oil cavity is a large-caliber end of the conical structure.
  9. 9. The high-pressure high-flow hydraulic cylinder according to claim 1, wherein an oil inlet (7) is formed in the bottom end of the cylinder body (1), one end of the oil inlet (7) is communicated with the high-pressure oil cavity, an oil inlet pipe (8) is arranged at the other end of the oil inlet, and an included angle between the oil inlet (7) and the axis of the cylinder body (1) is between 30 and 60 degrees.
  10. 10. The high-pressure high-flow hydraulic cylinder according to claim 1, wherein a cylinder cover (4) and an exhaust valve (6) are further arranged at the top end of the cylinder body (1), a piston rod (3) is arranged at the top of the piston structure (2), the piston rod (3) penetrates through the cylinder cover (4), and a sealing structure (5) is arranged at the joint of the piston rod (3) and the cylinder cover (4).

Description

High-pressure high-flow hydraulic cylinder Technical Field The invention relates to the technical field of hydraulic cylinders, in particular to a high-pressure high-flow hydraulic cylinder. Background The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The device has simple structure and reliable operation. When it is used to realize reciprocating motion, it can eliminate speed reducer, and has no transmission clearance and smooth motion, so that it can be widely used in hydraulic systems of various machines. The hydraulic cylinders are various, the core difference between the high-pressure high-flow hydraulic cylinder and the common hydraulic cylinder is the use condition of high pressure high flow, and the problem that the piston structure is worn in a sealing way, has lubrication failure and has response delay due to the fact that oil liquid with high pressure high flow impacts the inner wall of the cylinder. The design of the piston structure of the traditional hydraulic cylinder is consistent with the characteristics of sealing and lubricating by a single structure, the sealing and lubricating functions are realized only through the fixed gap between the piston structure and the cylinder wall and the passive cooperation of a single sealing piece, the structure is simple, the high-pressure high-flow use condition cannot be adapted, the balance between the sealing and the lubricating depends on a compromise design, for example, the fixed gap between the traditional piston structure and the cylinder wall is adopted, the gap is required to meet the minimum gap generated by an oil film and the maximum gap which does not exceed the sealing, a compromise fixed value is selected, but the oil film formed by the piston structure cannot be adapted to the high-flow oil under the condition of high pressure high flow, the formed oil film is extremely easy to be scoured and broken, and if the gap is enlarged, the sealing effect is influenced, so that the balance design of the traditional hydraulic cylinder has certain defects. Disclosure of Invention The invention aims to solve the problem that the hydraulic oil cylinder is difficult to lubricate and seal under the working condition of high pressure and large flow rate, and provides the high pressure and large flow rate hydraulic oil cylinder which has the advantages of three-section gap design and good seal and stable lubrication under the working condition of high pressure and large flow rate. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The utility model provides a high-pressure large-traffic hydraulic cylinder, includes cylinder body and piston structure, piston structure will the cylinder body divide into high-pressure fluid chamber and has the pole chamber, piston structure includes from high-pressure fluid chamber to have first lateral wall, second lateral wall and the third lateral wall that pole chamber direction intercommunication set gradually, first lateral wall, second lateral wall and third lateral wall respectively with form first clearance, second clearance and third clearance between the cylinder body inner wall, the clearance width in second clearance, first clearance, third clearance reduces in proper order, set up first ring channel on the first lateral wall, first ring channel with first clearance intercommunication, set up the third ring channel on the third lateral wall, the one end of third ring channel with third clearance intercommunication, the other end pass through high-pressure channel with high-pressure fluid chamber intercommunication. Preferably, the bottom of the piston structure is also provided with a communication hole, and the first annular groove is communicated with the high-pressure oil liquid cavity through the communication hole. Preferably, the first annular groove has an internal volume greater than the internal volume of the third annular groove. Preferably, the length of the second side wall is greater than the lengths of the first side wall and the third side wall, respectively. Preferably, a second annular groove is formed in the second side wall, the second annular groove is communicated with the second gap, and the caliber width of a notch of the second annular groove is larger than that of the bottom of the groove. Preferably, the second annular grooves are arranged in a plurality, and are uniformly distributed along the length direction of the second side wall. Preferably, the high-pressure channel comprises a plurality of branch channels and a main channel communicated with the branch channels, the branch channels are communicated with the third annular groove, and the main channel is communicated with the high-pressure oil liquid cavity. Preferably, the branch channels are circumferentially distributed on the main channel, the bottom of the main ch