JPH0683766B2 - File Take - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter case for accommodating a filter for protecting hydraulic equipment in a hydraulic circuit.

2. Description of the Related Art A hydraulic circuit is provided with a filter for protecting hydraulic equipment because the oil circulating in the hydraulic equipment contains dust and the like, which shortens the life of the hydraulic equipment and causes malfunctions.

This filter is usually housed in a filter case, but if one filter is not enough due to the large amount of oil circulating due to the enlargement of hydraulic equipment, etc., multiple filters should be installed. The filter capacity is increasing.

For example, as shown in FIG. 5, the first, second and third parts having the same shape
The first, second, and third filter cases are connected by connecting the inlets of the filter cases 1, 2, and 3 to the merging block 7 with the first, second, and third distribution tubes 4, 5, and 6 so that the inlet tubes 8 communicate with each other. The lower part of 1,2,3, that is, the part where the oil that has passed through the filter is connected with the confluent tube 9, and the outlet tube 10 is connected to the lower part of the second filter case 2 so that three filters are provided. .

As shown in FIGS. 6 to 8, a box-shaped filter case 11
Has a size capable of accommodating two filters 12, one inlet 13 is formed in the filter case 11, and oil is circulated through the two filters 12 and discharged from one outlet 14 at the bottom.

Etc. are known.

Problems to be Solved by the Invention With the former filter case, a plurality of distribution tubes and a confluence tube must communicate with each other, which is troublesome and requires a large-scale installation space. Is large.

Since the latter filter case is box-shaped, the proof stress against internal pressure is small and deformation occurs as shown by imaginary lines on the surface of each plate constituting the filter case, which causes high stress in the welded part of the plate, It is necessary to increase the strength by increasing the plate thickness or applying the side ribs 15 and the ribs 16, which increases the weight and the material cost, resulting in a high cost.

Means and Actions for Solving Problems The notch edge of the cylindrical auxiliary case body is fixed to the outer peripheral wall of the cylindrical main case body to increase the proof stress against internal pressure and improve the strength and reliability. As a small size, it can be installed in a small space.

Example In the outer peripheral wall 20a of the cylindrical main case body 20, the cutout portion 22 of the discontinuous auxiliary case body 21 having the same shape as the main case body 20 and a part of the peripheral wall is cut out along the longitudinal direction. Edge 22
Butts are fixed by welding, and the upper and lower sides of the main case body 20 and the auxiliary case body 21 are closed by the upper plate 23 and the lower plate 24, respectively.
Insert the filter 26 with the upper plate 23 removable with bolts 25,
The outer wall 20 of the main case body 20 is removable
A hole 27 opening to the auxiliary case main body 21 is formed in a, and a cover 28 is attached by welding between both outer peripheral walls 20a and 21a to form a substantially V-shaped distribution chamber 29, and the cover is formed. An inlet 30 is provided at 28, and an inflow hole 31 is provided at each outer peripheral wall 20a, 21a.
Oil from the distribution chamber 29 into the inflow hole 31
After that, the flow is divided into the main case main body 20 and the auxiliary case main body 21 to flow into the main case main body 20 and the auxiliary case main body 21. At this time, by displacing the inlet 30 and the inflow hole 31 up and down by l _1, a baffle function for preventing oil hammer can be provided, and a special baffle plate does not have to be provided, so that the structure is simplified.

The lower plate 24 has a discharge tube for positioning the filter 26.
32 is formed by opening into the confluence chamber 33, and this confluence chamber 33 is an outlet.
While opening to 34, the filter 26 is attached to the lower plate 24 by the spring 35.
Is positioned by the discharge tube 32 and is fitted with a safety valve 36 at the top.

Alternatively, as shown in FIG. 4, a plurality of auxiliary case bodies 21 may be successively welded and fixed so that a plurality of filters 26 can be connected in series.

Effects of the invention Since the main case main body 20 and the auxiliary case main body 21 are cylindrical, the strength against internal pressure is increased and the strength and reliability are improved without increasing the wall thickness or using reinforcing ribs.
Since the cutout edge 22a of the auxiliary case body 21 is welded to the outer peripheral wall 20a of the main case body 20, distribution and diversion tubes are not required, so the overall size is reduced.

Therefore, the overall weight is reduced and the installation space can be reduced.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, wherein FIG. 1 is a transverse sectional view, FIG. 2 is a front view, FIG. 3 is a partially cutaway side view, and FIG.
FIG. 5 is a cross-sectional view of another embodiment, FIG. 5 is a plan view of a first conventional example, FIGS. 6, 7, and 8 are front views, plan views, and cross-sections of a second conventional example. It is a figure. 20 is a main case body, 20a is an outer peripheral wall, 21 is an auxiliary case body, 21a is an outer peripheral wall, 22 is a notch, and 22a is an edge.

Claims (1)

[Claims] 1. An outer peripheral wall 20a of a cylindrical main case body 20,
The notch end edge 22a of the auxiliary case main body 21 having a cylindrical notch 22 extending in the longitudinal direction is fixed and integrally connected, and an oil inflow hole and an outlet are formed in the main case main body 20 and the auxiliary case main body 21. A filter case that is characterized by what you have done.