JPH0454921Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention [Field of Industrial Application] The present invention relates to an improvement for stirring hydraulic oil in an oil tank.

[Prior art and its problems]

The return oil piping for the hydraulic oil in conventional oil tanks is installed at a right angle or at a certain angle toward the bottom of the oil tank, as shown in Figure 4, and its tip is mainly shaped by cutting the return oil piping diagonally. It was adopted by

Today, it is becoming increasingly clear that the temperature of the hydraulic fluid has a very important effect on the operation of the hydraulic system, and even more so, as special precision is required for the operation of the hydraulic system. , proper management of hydraulic oil temperature has become an important issue.

However, in the conventional method of discharging return oil into an oil tank, the flow at the outlet of the return oil pipe is slow, and the return oil remains near the bottom of the return oil pipe. For this reason,
Both oil that has passed through the oil cooler and oil that has not passed through the oil cooler carry a certain amount of heat from the circuit, so heat builds up in local areas of the oil tank, causing the hydraulic oil in these areas to flow back into the hydraulic system. In order to do so, the effect of oil temperature fluctuations would occur on the actuator.

The purpose of the present invention is to efficiently agitate the hydraulic oil in the oil tank, cool the oil temperature in the oil tank, and improve accuracy in the operation of the hydraulic system that uses the hydraulic oil.

Structure of the invention [Means for solving the problem] An internal return oil pipe is formed in the oil tank to connect with the external return oil pipe, and the discharging tip end of the internal return oil pipe is disconnected from the internal return oil pipe. The oil tank device is characterized in that the opening has a flat opening having a cross-sectional area approximately equal to the area of the oil tank, and the leading edge thereof is oriented in an approximately horizontal direction.

[Effect]

In this invention, the hydraulic oil that has returned to the oil tank passes through the return oil pipe inside the oil tank and is discharged horizontally at a faster speed than the narrow horizontal opening at the return oil pipe outlet. Agitation within the oil tank can be promoted.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall view of a return oil pipe provided in an oil tank according to the present invention, FIGS. 2 and 3 show the shape of the tip of the return oil pipe, and FIG. 4 shows a conventional example.

In the figure, 10 is an oil tank, 11 is hydraulic oil,
12 is an external return oil pipe from the hydraulic system, 13 is a flange that connects an internal return oil pipe 14 (described later) inside the oil tank and the external return oil pipe 12, and 14 is an internal return oil pipe connected to the flange 13. 15
is the tip of the internal return oil pipe 14, and detailed views are shown in FIGS. 2 and 3. Reference numeral 16 represents the shape of the tip end of the internal return oil pipe 14, and 17 is a rectangular flat opening, and 17 is an elliptical flat opening. It is made almost equal to

The hydraulic oil 11 returning to the oil tank 10 passes through an external return oil pipe 12, passes through a flange 13, passes through an internal return oil pipe 14 of the oil tank 10, and reaches the tip end 1.
5. The hydraulic oil 11 is squeezed at the tip 15,
Since it is discharged horizontally into the oil tank 10 at a high speed, the stirring effect is large, and the hydraulic oil 1 in the oil tank 10 is
1 can be kept at a uniform temperature. Furthermore, since the cross-sectional areas of the rectangular flat opening 16 and the elliptical flat opening 17 are made approximately equal to the cross-sectional area of the internal return oil pipe 14, extreme back pressure is not applied to the internal return oil pipe 14.

Effects of the present invention The present invention has a rectangular or elliptical flat opening structure at the end of the return oil pipe formed in the oil tank, so that the hydraulic oil with increased oil temperature can be widely dispersed throughout the oil tank. By stirring, it is possible to reduce the oil temperature, and it is possible to secure hydraulic oil with a constant oil temperature necessary for the operational accuracy of the hydraulic system, making it possible to obtain an extremely simple oil tank with high cooling capacity. .

[Brief explanation of the drawing]

FIG. 1 shows an overall view of a return oil pipe provided in an oil tank according to the present invention, and FIGS. 2 and 3 show the shape of the tip of the return oil pipe. FIG. 4 shows a conventional example. 10...Oil tank, 11...Hydraulic oil, 12...
External return oil piping, 13...Flange, 14...Internal return oil piping, 15...Return oil piping tip, 16
... Rectangular flat opening, 17... Oval flat opening.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An internal return oil pipe connected to an external return oil pipe is formed in the oil tank, and the discharge tip end of the internal return oil pipe is defined as the cross-sectional area of the internal return oil pipe. An oil tank device characterized in that the openings have flat openings with substantially equal cross-sectional areas, and the leading edge portions are oriented in a substantially horizontal direction. (2) The oil tank device according to claim 1, wherein the flat opening has a rectangular shape. (3) The oil tank device according to claim 1, wherein the flat opening has an oval shape.