JPH08966Y2 - Filtration device for machining fluid for electric discharge machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a machining liquid filtering device for an electric discharge machine.

"Prior art and its problems" In electrical discharge machining, an electrical discharge phenomenon is caused in a machining fluid between a work piece and an electrode, and the action causes the work piece to be gradually cut into chips such as powder or grains. This is a method of processing, and inevitably a large amount of extremely fine cutting powder is mixed in the working fluid, but this working fluid is repeatedly used after being filtered.

As a filtering device for filtering such a working liquid,
As shown in the figure, the inlet 1 for the working fluid to be filtered upward
A fold-fold filter 4 is provided inside a filter housing 3 having a filtered processing liquid discharge port 2 at the lower end, and the processing liquid is introduced into the filter housing 3 through the inlet port 1 and fold-folded. A filtering device is generally used, which is filtered inward from the outer peripheral fold portion 5 of the filter 4 and discharged from the outlet 2.

However, since the chips and the like in the working liquid are extremely fine, this filter device causes the filter to be clogged in a short time, so that the fold-fold filter must be frequently replaced. Therefore, there is a problem that work efficiency is poor, uneconomical, and costly.

An object of the present invention is to provide a machining fluid filtering device for an electric discharge machine in which such drawbacks are eliminated and the frequency of filter replacement is greatly reduced.

"Means for Solving Problems" A structure of the present invention which meets the above-mentioned object is a filter housing having an inlet for a working fluid to be filtered upward and an outlet for a filtered fluid downward, and the housing. Between the cylindrical filter mounted inside in the longitudinal direction, the cylindrical body arranged at intervals outside the cylindrical filter, and between the cylindrical filter formed below the cylindrical filter and the cylindrical body. A storage chamber for the working fluid that has passed through, a storage chamber for the filtrate filtered by the tubular filter, and a plate body having a large number of through holes that divide the storage chamber for the processing fluid into upper and lower chambers. It is characterized in that it has a filter provided and a bag filter for filtering the working fluid in the working fluid storage chamber below.

The cause of the effect of the present invention is, first of all, to wash down the fine powder adhering to the filter by giving an appropriate flow velocity when the working fluid is dropped through the narrow passage between the filter and the cylinder. The second reason is that the clogging of the filter is prevented. Secondly, the fine powder in the washed processing liquid passes through the plate body with many through holes by gravity settling, and this plate body causes the wave motion. In order to absorb the particles, the particles are accumulated in a storage chamber with less undulations to accelerate the aggregation of the particles, increase the size of the particles, and enable filtration with a coarse, low-priced bag filter.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention, in which a filtering machine 13 has an inlet 11 for a working fluid at an upper part thereof and an outlet 12 for a filtrate at a lower end side thereof, and a partition formed inside thereof. A large number of cylindrical filters 14 are erected above the wall 16, and cylindrical cylinders 15 are arranged outside the filters 14 at intervals. Incidentally, in FIG. 1, the filter 14 and the cylindrical body 15 are shown.
Shows only one each. The working fluid increases the flow velocity by passing through the narrow passage between the filter 14 and the cylinder 15, thereby washing away the fine particles adhering to the outer peripheral surface of the filter 14 downward, so that the clogging of the filter 14 is effectively prevented. To be done.

Below the partition wall 16, a storage chamber for the non-filtered working fluid passing between the filter 14 and the cylindrical body 15 is continuously provided, and the working fluid storage chamber is provided with a large number of through holes 18. The plate body 19 divides the upper working fluid storage chamber 17 and the lower working fluid storage chamber 24. Part of the fine particles in the working fluid that has passed between the filter 14 and the cylinder 15 returns to the D tank through the return circuit 26, but the remaining part of the fine particles in the processing liquid passes through the through hole of the plate body 19 due to self-weight sedimentation.
It passes through 18 and enters the lower working fluid storage chamber 24. In the lower processing liquid storage chamber 24, the influence of the wave motion of the upper storage chamber 17 is extremely small, so that the aggregation of the particles is promoted and the particles are effectively enlarged.

The working fluid containing the agglomerated particles introduced into the lower working fluid storage chamber 24 in this way is a bag filter by a pump 20 combined with a timer or the like that operates at regular intervals.
It is introduced into 21 and filtered. Since the fine particles in the working liquid are aggregated and the particles are large and the extremely fine particles are allowed to pass through the cylindrical filter 14, clogging of the bag filter 21 is effectively prevented. It

The working fluid in the upper working fluid storage chamber 17 is in a waving state, but the working fluid in the lower working fluid storage chamber 24 is separated from the upper working fluid by the plate body 19. It is stationary. A thicker plate 19 has a stronger force for keeping the lower working fluid in a stationary state, and therefore an appropriate thickness may be selected so as to keep the lower working fluid in a stationary state.

In the above-mentioned embodiment, the pump 20 is made to operate at fixed time intervals predetermined by the timer, but this is achieved by setting the stationary time of the lower working fluid to a certain length. This is to ensure the aggregation of particles that have settled from the upper processing liquid.

When the lower processing liquid is transferred to the bag filter 21 by the pump 20, the upper processing liquid gradually drops into the lower processing liquid storage chamber 24, and is filled and kept stationary. Sediments and aggregates.

The filtrate filtered by the bag filter 21 is introduced into a dirty tank (D tank) that contains the machining fluid used for electric discharge machining, and is introduced into the filter 13 from the D-tank by the pump 22.

The so-called loose filtrate that has passed inward from the outer peripheral surface of the filter 14 is introduced into the storage chamber 23 through the passage 25. The filtrate is
It is transported to the clean tank (C tank) containing the machining liquid used for electric discharge machining through the discharge port 12.

[Advantage of the Invention] As described above, according to the present invention, since the outer peripheral surface of the filter is filtered so as to be washed off by giving an appropriate flow velocity, the filter is effectively prevented from being clogged with fine particles. At the same time, the particles in the working fluid that have been washed off and dropped pass through the through holes of the plate due to self-weight sedimentation, and the particles easily aggregate due to the wave absorption effect of the plate, and the particles that have aggregated and become large are inexpensive. Since it is filtered by a simple bag-shaped filter, it is not necessary to replace the filter as frequently as in the conventional case, so that work efficiency can be improved and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional filtering device. In the figure, 13 ... filter, 14 ... cylindrical filter, 15 ... cylindrical body,
17 ... Upper processing liquid storage chamber, 19 ... Plate, 21 ... Bag filter, 23 ... Filtration storage chamber, 24 ... Lower processing liquid storage chamber.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 29/10 530 A 29/38 530 Z 29/24 F

Claims (1)

[Scope of utility model registration request] 1. A filter housing having an inlet for a processing liquid to be filtered upward and an outlet for a filtered liquid downward, a cylindrical filter vertically mounted in the housing, and the cylindrical shape. A cylindrical body arranged outside the filter at a distance, and a chamber for processing fluid passing between the cylindrical filter and the cylindrical body formed below the cylindrical filter,
A storage chamber for the filtrate filtered by the tubular filter,
A filter having a plate body having a large number of through holes for partitioning the processing liquid storage chamber into upper and lower chambers, and a bag filter for filtering the processing liquid in the lower processing liquid storage chamber. A machining fluid filtering device for an electric discharge machine, comprising: