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CN-224228974-U - Hydraulic system and working machine

CN224228974UCN 224228974 UCN224228974 UCN 224228974UCN-224228974-U

Abstract

The utility model belongs to the technical field of hydraulic transmission, and discloses a hydraulic system and a working machine. In any group of output circuits, the plurality of in-group plunger assemblies are connected with the common flow distribution oil way and the output oil way, and the common flow distribution oil way divides oil from the plurality of in-group plunger assemblies under the condition that the common flow distribution oil way is conducted by the common flow distribution oil way so as to regulate the oil quantity reaching the output oil way from the plurality of in-group plunger assemblies. The system can realize the oil supply driving of a plurality of action execution loops only by one digital displacement pump, and each output loop in the digital displacement pump can realize the control of output displacement by only one shared switch valve, thereby reducing the number of the shared switch valves and greatly lowering the cost.

Inventors

  • CHENG QIAN
  • FU LING
  • LIU YANBIN
  • YIN LI
  • GUO JIDONG
  • WANG WEI

Assignees

  • 中联重科股份有限公司

Dates

Publication Date
20260512
Application Date
20250519

Claims (10)

  1. 1. A hydraulic system, the hydraulic system comprising: a plurality of action execution loops (5); The digital displacement pump (1) comprises a plurality of groups of output loops (11) which are connected with the action execution loops (5) in a one-to-one correspondence manner, wherein each group of output loops (11) comprises a plurality of intra-group plunger assemblies, a common distributing oil way (11 c), a common switching valve (11 d) for controlling the on-off of the oil way of the common distributing oil way (11 c) and an output oil way (11 a); In any one of the output circuits (11), the plurality of in-group plunger assemblies are connected with the common distribution oil passage (11 c) and the output oil passage (11 a), and the common distribution oil passage (11 c) divides the oil from the plurality of in-group plunger assemblies under the condition that the common switch valve (11 d) is conducted so as to regulate the oil amount reaching the output oil passage (11 a) from the plurality of in-group plunger assemblies.
  2. 2. The hydraulic system according to claim 1, wherein the output circuit (11) further comprises a first non-return valve (11 e), the first non-return valve (11 e) being arranged between each of the group of inner plunger assemblies and the common distribution oil circuit (11 c), the first non-return valve (11 e) being configured to be turned on and turned off in reverse when hydraulic oil flows from the group of inner plunger assemblies to the common distribution oil circuit (11 c).
  3. 3. The hydraulic system according to claim 1, wherein the output circuit (11) further comprises a second one-way valve (11 f), the second one-way valve (11 f) being arranged between each of the in-group plunger assemblies and the output oil circuit (11 a), the second one-way valve (11 f) being configured to be turned on and turned off in reverse when hydraulic oil flows from the in-group plunger assemblies to the output oil circuit (11 a).
  4. 4. The hydraulic system according to claim 1, wherein the output circuit (11) further comprises an oil compensating oil circuit (11 b) and a third check valve (11 g), the plurality of in-group plunger assemblies each being connected to the oil compensating oil circuit (11 b), the third check valve (11 g) being provided between each of the in-group plunger assemblies and the oil compensating oil circuit (11 b), the third check valve (11 g) being configured to be turned on and turned off in reverse when hydraulic oil flows from the oil compensating oil circuit (11 b) to the in-group plunger assemblies.
  5. 5. The hydraulic system according to claim 1, wherein the plurality of intra-group plunger assemblies includes a first plunger assembly (111), a second plunger assembly (112), and a third plunger assembly (113), and the common distribution oil passage (11 c) is connected to the first plunger assembly (111), the second plunger assembly (112), and the third plunger assembly (113), respectively.
  6. 6. The hydraulic system according to claim 1, characterized in that the common distribution oil circuit (11 c) is also connected to an oil return oil circuit.
  7. 7. The hydraulic system according to any one of claims 1 to 6, wherein the number of the output circuits (11) is at least two, a converging oil circuit (2) is connected between the output oil circuits (11 a) of at least two groups of the output circuits (11), and a converging valve (21) for controlling the on-off of the oil circuits is arranged on the converging oil circuit (2).
  8. 8. Hydraulic system according to any of claims 1 to 6, characterized in that it further comprises an output control valve (3), said output control valve (3) being integrated in said digital displacement pump (1) or arranged outside said digital displacement pump (1), said output control valve (3) being adapted to control the opening and closing of an oil circuit between said output oil circuit (11 a) and the corresponding action execution circuit (5).
  9. 9. The hydraulic system of any of claims 1 to 6, wherein the digital displacement pump (1) further comprises a rotor (14), the rotor (14) being configured to drive a plurality of the intra-group plunger assemblies within the output circuit (11) to draw oil with a preset phase difference, wherein the plurality of intra-group plunger assemblies within any of the output circuits (11) are evenly arranged along a circumferential rotational direction of the rotor (14) of the digital displacement pump (1).
  10. 10. A work machine comprising a hydraulic system according to any one of claims 1 to 9.

Description

Hydraulic system and working machine Technical Field The utility model belongs to the technical field of hydraulic transmission, and particularly relates to a hydraulic system and a working machine. Background In the traditional hydraulic system, when a single pump drives a multi-action execution loop, the cooperation of a pressure compensation valve and a proportional valve is relied on, so that throttling loss and overflow loss exist, the efficiency is low, and the multi-pump independent driving scheme improves the coordination of compound actions, but obviously increases the installation power, the installation size and the cost. Digital displacement pumps were proposed to break through this contradiction. The core principle of the digital displacement pump is that a single hydraulic pump has a multi-output loop function through the cooperative work of a plurality of plungers, and the effective working stroke of the plungers in the pump is controlled through a high-speed switching valve, so that the displacement of each loop can be independently regulated. Wherein, each plunger of the existing digital displacement pump is provided with at least one high-speed switch valve, so that the system has high installation cost and a bulky structure, and is difficult to popularize and reference on a large scale. Disclosure of utility model The utility model provides a hydraulic system and a working machine aiming at overcoming the defects and shortcomings, and aims to solve the technical problems of high installation cost and structural bulkiness of the existing hydraulic system with a digital displacement pump. To achieve the above objects, the present utility model provides a hydraulic system including a plurality of motion execution circuits and a digital displacement pump. The digital displacement pump comprises a plurality of groups of output loops which are connected with a plurality of action execution loops in a one-to-one correspondence manner, wherein each group of output loops comprises a plurality of in-group plunger assemblies, a common flow distribution oil way, a common switch valve for controlling the on-off of the oil way of the common flow distribution oil way and an output oil way, in any group of output loops, the plurality of in-group plunger assemblies are connected with the common flow distribution oil way and the output oil way, and the common flow distribution oil way is used for distributing oil from the plurality of in-group plunger assemblies under the condition that the common switch valve is conducted so as to regulate the oil quantity reaching the output oil way from the plurality of in-group plunger assemblies. In an embodiment of the utility model, the output circuit further comprises a first check valve arranged between each of the intra-group plunger assemblies and the common distribution oil passage, the first check valve being configured to be turned on and turned off in reverse when hydraulic oil flows from the intra-group plunger assemblies to the common distribution oil passage. In an embodiment of the utility model, the output circuit further comprises a second check valve arranged between each of the in-group plunger assemblies and the output oil passage, the second check valve being configured to be turned on and turned off in reverse when hydraulic oil flows from the in-group plunger assemblies to the output oil passage. In an embodiment of the present utility model, the output circuit further includes an oil compensating oil path and a third check valve, wherein the plurality of in-group plunger assemblies are connected to the oil compensating oil path, the third check valve is disposed between each in-group plunger assembly and the oil compensating oil path, and the third check valve is configured to be turned on and turned off reversely when hydraulic oil flows from the oil compensating oil path to the in-group plunger assembly. In an embodiment of the present utility model, the plurality of intra-group plunger assemblies includes a first plunger assembly, a second plunger assembly, and a third plunger assembly, and the common fluid distribution oil passage is connected to the first plunger assembly, the second plunger assembly, and the third plunger assembly, respectively. In the embodiment of the utility model, the common distributing oil way is also connected with the oil return oil way. In the embodiment of the utility model, the number of the output loops is at least two, a converging oil way is connected between the output oil ways of at least two groups of output loops, and a converging valve for controlling the on-off of the oil ways is arranged on the converging oil way. In an embodiment of the utility model, the hydraulic system further comprises an output control valve integrated in the digital displacement pump or arranged outside the digital displacement pump, the output control valve being used for controlling the on-off of the oil passage between the ou