JPH0540322Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a temporary oil tank for a hydraulic system for construction machinery.

[Prior Art] This type of oil tank has a hollow box-shaped tank body. A return pipe that discharges return oil from the hydraulic actuator passes through the tank body and has an oil filter attached to its end. Additionally, the outgoing pipe that sucks out hydraulic oil from the tank body also has an oil filter installed inside the tank body.

Return oil from the hydraulic actuator flows into the tank body through the control valve and return pipe, is filtered by an oil filter, and is returned to the hydraulic pump.

[The problem that the idea aims to solve]

In the oil tank as described above, since the hydraulic oil becomes a turbulent flow inside the tank body, it is impossible to avoid the generation of air bubbles in the hydraulic oil. When hydraulic oil containing many air bubbles is sucked into the pump, erosion occurs in the pump due to cavitation, which not only reduces the efficiency of the hydraulic pump but also shortens the life of the pump.

The present invention improves the problems of the prior art as described above, prevents the generation of bubbles with a simple structure, and
An object of the present invention is to provide an improved oil tank for a hydraulic system for construction machinery that can improve the efficiency of a hydraulic pump.

[Means to solve the problem]

In order to achieve the above objects, the present invention includes a tank body, a return pipe attached to the upper part of the tank body, an outgoing pipe attached to the lower part of the tank body, and an oil filter for the return pipe and the outgoing pipe. In an oil tank for a hydraulic system for construction machinery, which is provided in the tank body, an oil filter for a return pipe is installed in one corner of the tank body, and the discharge pipe from the oil filter is connected toward one side wall of the tank away from the filter. and is arranged diagonally downward toward the bottom wall of the tank, and divides the tank body into a chamber containing a return pipe oil filter and a chamber containing an outbound pipe oil filter by a partition wall, and the partition An opening is provided in the wall at a position where the hydraulic oil discharged from the discharge pipe bounces off the bottom wall of the tank, and the oil filter for the outbound pipe is disposed near the partition wall.

[Effect]

Since the oil tank of the present invention is constructed as described above, the hydraulic oil discharged from the discharge pipe arranged diagonally downward is bounced off the bottom wall of the tank and is sent to the outgoing pipe through the opening provided in the partition wall. The oil flows into the chamber containing the oil filter, and since the flow direction of the oil is diagonally upward with respect to one side wall of the tank, it becomes a swirling flow and generates a large vortex in the chamber containing the oil filter for the outgoing pipe, thus causing oil to flow into the oil tank. Since the inflowing hydraulic oil is made to flow smoothly and is sucked into the outgoing pipe through the outgoing pipe oil filter provided near the partition wall, the generation of air bubbles can be prevented and the suction efficiency of the pump can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, reference numeral 11 indicates a tank body. The tank body 11 is box-shaped with a hollow interior, and although not shown in the figure, a lid is provided on its top wall, and a drain device is provided on its bottom wall.

Reference numeral 18 denotes a return pipe that passes through the upper part of one side wall of the tank body, and its tip is connected to the oil filter 12 for the return pipe. Return pipe oil filter 1
2 consists of a casing 14 and a filter paper element 15 housed inside the casing, and after filtering the oil that has flowed into the casing 14 from the return pipe 18 through the filter paper element 15,
This is a well-known method in which the fuel is discharged into the tank body through the inside of the tank.

13 is an oil filter for the outgoing pipe, and filter paper element 1
6 and an outlet pipe 17 therein, the outlet pipe 17 is attached through the bottom wall 24 of the tank body 11, and the outlet pipe 17 and the outgoing pipe 20 are connected by a flange.

In the present invention, the return pipe oil filter 12
is arranged vertically at one corner of the tank body 11, as shown in FIGS. 1 and 2, and the discharge pipe 19 from the oil filter is directed toward one side wall of the tank away from the filter, Moreover, it is installed diagonally downward toward the tank bottom wall 24, and the tank body is divided by a partition wall 21 into a chamber 22 having a return pipe oil filter 12 and a chamber 23 having an outgoing pipe oil filter 13. Along with that partition wall 2
An opening 2 is provided at a position where the hydraulic oil discharged from the discharge pipe 19 of No. 1 bounces off the tank bottom wall 24 and hits the tank bottom wall 24.
5 is provided, and the outgoing pipe oil filter 13 is further disposed at a position close to the partition wall when viewed from above.
It is assumed that the chamber 22 has a smaller volume than the chamber 23.

Since the oil tank of the present invention has the above-described configuration, the hydraulic oil flowing into the oil tank 11 from the return pipe 18 is filtered by the return pipe oil filter 12 and then discharged diagonally downward from the discharge pipe 19. The hydraulic oil bounces off the tank bottom wall 24 and flows through the opening 25 provided in the partition wall 21 into the chamber 23 containing the outbound pipe oil filter 13, and the flow direction of the oil is diagonally upward with respect to one side wall of the tank. Therefore, it becomes a swirling flow as shown by arrow B in Fig. 2 and flows into chamber 2.
3, a large vortex is generated in the oil tank to smoothly flow the hydraulic oil that has entered the oil tank and sucked into the outgoing pipe 20 from the outgoing pipe oil filter 13, thereby preventing the generation of air bubbles and improving pump efficiency. can be done.

[Effect of idea]

As described above, according to the present invention, the hydraulic oil that has flowed into the oil tank becomes a vortex in the chamber that has the oil filter for the outgoing pipe, causing the oil to flow smoothly and being sucked into the outgoing pipe, so that bubbles are not generated. This has the effect of preventing this and improving pump efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the oil tank of the hydraulic system for construction machinery according to the present invention, and FIG. 1 is a partially cutaway side view, and FIG. 2 is a sectional view taken along the line - in FIG. 1. be. 11... Oil tank, 12... Oil filter for return pipe, 13... Oil filter for outgoing pipe, 18... Return pipe, 19... Discharge pipe, 20... Outgoing pipe, 21... Partition wall, 24... Tank Bottom wall, 25...opening.

Claims (1)

[Scope of utility model registration request] A hydraulic system for construction machinery that includes a tank body, a return pipe attached to the upper part of the tank body, an outgoing pipe attached to the lower part of the tank body, and oil filters for the return pipe and the outgoing pipe are provided in the tank body. In an oil tank, an oil filter for a return pipe is installed in one corner of the tank body, and the discharge pipe from the oil filter is directed diagonally downward toward one side wall of the tank away from the filter and toward the bottom wall of the tank. In addition, the tank body is divided by a partition wall into a chamber having a return pipe oil filter and a chamber having an outgoing pipe oil filter, and the hydraulic oil discharged from the discharge pipe of the partition wall is transferred to the tank. An oil tank for a hydraulic system for construction machinery, characterized in that an opening is provided at a position where it rebounds from a bottom wall, and the outgoing oil filter is disposed near the partition wall.