JPS5830961Y2 - Hydraulic oil tank pressurization device - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to a hydraulic oil tank pressurizing device for pressurizing the inside of the hydraulic oil tank mounted on a construction machine in order to increase pump efficiency.

Generally, construction machinery is equipped with a hydraulic oil tank that stores the hydraulic oil to drive the working equipment, and the pump that sends the oil in this hydraulic oil tank to the working equipment has a high performance like a plunger pump. Some hydraulic oil tanks need to be pressurized to increase the

For this reason, in the past, a separate compressor was installed and air pressure was sent into the sealed hydraulic oil tank to pressurize the inside of the hydraulic oil tank, but a separate air pressure source had to be installed, resulting in major damage to the equipment. This makes it uneconomical.

This idea was made to solve this problem, and the hydraulic oil tank is designed to pressurize the inside of the tank by introducing hydraulic pressure from a hydraulic source that does not require pressurization into the sealed hydraulic oil tank. By providing a pressurizing device, it is possible to pressurize the inside of a hydraulic oil tank without providing a separate air pressure source.

An embodiment of this invention will be described in detail below.

The button 1 in the figure is an engine mounted on a construction machine (not shown), and is capable of simultaneously driving a hydraulic oil pump 2 and an existing pump 3 such as a pilot pump.

The suction side of the hydraulic oil pump 2 is connected to a sealed hydraulic oil tank 5 through a pipe 4, and the discharge side is connected to an actuator 7 such as a working machine and the hydraulic oil tank 5 via an operating valve 6. ing.

In addition, the existing pump 3 is a pump that does not require pressurization, and the suction side is connected to the main tank 9 through a pipe 8.
The discharge side is connected to an actuator 11 and a hydraulic oil tank 5 via an operating valve 10.

Note that 12 is a relief valve that relieves part of the pressure in the main tank 9 when the pressure in the hydraulic oil tank 3 becomes higher than necessary, and since the set pressure is low, it may be an orifice.

Moreover, the hydraulic oil tank 5 and the main tank 9 may of course be provided integrally.

As described in detail above, this invention is designed to pressurize the inside of the hydraulic oil tank 5 by introducing a part of the pressure from the existing pump 3, which does not require pressurization, into the hydraulic oil tank 5, which has a sealed structure. Therefore, it is economical as it does not require a separate pneumatic source such as a compressor as in the past.

In addition, since the entire system can be configured with only a hydraulic circuit, related piping can be simplified, such as by being able to keep one circuit in one place.

[Brief explanation of the drawing]

The drawing is a circuit diagram of an embodiment of this invention. 2 is a hydraulic oil pump, 3 is an existing pump, and 5 is a hydraulic oil tank.

Claims (1)

[Scope of utility model registration request] Work that uses the hydraulic oil tank 5 as an oil source by introducing the return oil of the hydraulic pressure supplied to the actuator 11 from the existing pump 3 into the hydraulic oil tank 5 having a sealed structure and pressurizing the inside of the hydraulic oil tank 5. This hydraulic oil tank pressurizing device improves the performance of the mechanical pump 2 and connects the main tank 9, which is the oil source of the existing pump 3, and the hydraulic oil tank 5 via a relief valve 12.