Hydraulic power system for downhole device and downhole device

A hydraulic power system for a downhole device, comprising:

• a first motor, a first hydraulic pump, a second hydraulic pump, a first main oil path, a second main oil path, a switching control module and a first execution module;
• wherein the first motor has a first output shaft and a second output shaft, wherein the first output shaft drives the first hydraulic pump, and an oil outlet of the first hydraulic pump is connected to an input end of the first main oil path;
• the second output shaft drives the second hydraulic pump, and an oil outlet of the second hydraulic pump is connected to an input end of the second main oil path;
• the first execution module is connected to an output end of the first main oil path;
• displacement of the first hydraulic pump is smaller than displacement of the second hydraulic pump;
• and
• the switching control module is connected between the first main oil path and the second main oil path, and is configured to adjust a working pressure of the first main oil path and a movement speed of the first execution module by controlling on-off between the first main oil path and the second main oil path ;.
• wherein a maximum working pressure of the first hydraulic pump is greater than a maximum working pressure of the second hydraulic pump;
• and
• the switching control module is further configured to adjust a working pressure of the second main oil path by controlling the on-off between the first main oil path and the second main oil path;
• wherein the switching control module comprises a first control unit and a second control unit;
• the first control unit is connected between the first main oil path and the second main oil path and configured to control oil liquid from the first main oil path to flow into the second main oil path when the working pressure of the first main oil path is greater than the working pressure of the second main oil path;
• and
• the second control unit is connected between the first main oil path and the second main oil path, and configured to control oil liquid from the second main oil path to flow into the first main oil path when the working pressure of the second main oil path is greater than the working pressure of the first main oil path;
• wherein the first control unit comprises a first reversing valve and a first one-way valve, wherein a first oil port of the first reversing valve is connected to a first connecting end of the first main oil path, a second oil port of the first reversing valve is connected to an oil inlet of the first one-way valve, and an oil outlet of the first one-way valve is connected to a first connecting end of the second main oil path;
• the first reversing valve is configured to control oil liquid from the first main oil path to flow into the second main oil path through the first reversing valve and the first one-way valve in sequence;
• and
• the second control unit comprises a second reversing valve and a second one-way valve, wherein a first oil port of the second reversing valve is connected to the first connecting end of the second main oil path, a second oil port of the second reversing valve is connected to an oil inlet of the second one-way valve, and an oil outlet of the second one-way valve is connected to the first connecting end of the first main oil path;
• the second reversing valve is configured to control oil liquid from the second main oil path to flow into the first main oil path through the second reversing valve and the second one-way valve in sequence;
• wherein the first connecting end of the first main oil path is anywhere between the input end and the output end of the first main oil path;
• the first connecting end of the second main oil path is anywhere between the input end and an output end of the second main oil path.