Hydraulic oil-return device, hydraulic system and excavator

A technology for hydraulic systems and excavators, which is applied to fluid pressure actuating devices, fluid pressure actuating system components, and mechanical equipment, etc., can solve problems such as hydraulic oil easily damages radiators, and high temperature oil cannot dissipate heat, so as to improve heat dissipation. effect, improve the service life, improve the practical effect

CN103470574AInactive Publication Date: 2013-12-25SANY HEAVY MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-12-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a hydraulic oil-return device, a hydraulic system and an excavator. The hydraulic oil-return device is characterized in that an oil-taking check valve is arranged on an oil-return oil circuit connected with a main valve, and an oil outlet of the oil-taking check valve is connected with a bypass check valve and a radiator which are in parallel connection, so that oil flowing out from the main valve is firstly decompressed via the oil-taking check valve to reduce oil-taking pressure of the radiator to have the same protected; in addition, the hydraulic oil-return device is further characterized by being provided with an oil-temperature control device, opening pressure of the bypass check valve is regulated according to oil temperature, when the oil temperature is higher, larger opening pressure can be set so as to allow the hydraulic oil to pass through the radiator as much as possible to have the oil temperature of an oil-return oil tank lowered and radiating effect improved; similarly, when the oil temperature is lower, the bypass check valve is controlled to be opened at the lower oil pressure so as to allow the hydraulic oil to pass through the bypass check valve as much as possible to improve use efficiency of the radiator, prolong the service life thereof, and improve practicability of the hydraulic oil-return device.
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Description

technical field

[0001] The invention relates to the back pressure oil return technology of a hydraulic system, in particular to a hydraulic oil return device, a hydraulic system and an excavator provided with the hydraulic oil return device. Background technique

[0002] At present, in order to increase the back pressure of the system, it is convenient for the hydraulic components to replenish oil while reducing the inlet pressure of the radiator, and to protect the radiator, an oil inlet check valve is installed in the hydraulic system; in order to prevent the radiator from being blocked, the oil return pressure is too high and damaged If the hydraulic components are faulty, install a bypass check valve in the hydraulic system.

[0003] The common installation positions of oil inlet check valve 03, bypass check valve 04 and radiator 02 are:

[0004] Such as figure 1 As shown, the oil inlet check valve 03 is installed behind the radiator 02, the bypass check valve 04 is co...

Examples

Embodiment Construction

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the description and sequence of specific structures in this section are only descriptions of specific embodiments, and should not be considered as limiting the protection scope of the present invention.

[0043] The main improvement of the embodiment of the present invention is that the return oil path of the main valve in the original hydraulic circuit passes through the radiator first. By connecting the oil return line of the main valve to the oil inlet of the oil inlet check valve first, and then connecting the oil outlet of the oil inlet check valve to the radiator, to ensure that the oil inlet pressure of the radiator will not be too high, Then it does not affect the service life of the rad...