JPH072006Y2 - Filter element for electric discharge machining fluid purification - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element used for cleaning an electric discharge machining fluid of an electric discharge machine.

[0002]

2. Description of the Related Art A filter element used in a filter for an electric discharge machining fluid is roughly classified into an external pressure type and an internal pressure type. In the external pressure type, the working fluid supplied under pressure is filtered from the outer surface of the filter element through the inner cylindrical space. The internal pressure type is a type in which a working fluid pressurized and supplied to the inner cylindrical space of the filter element is passed through the outer surface to be filtered. As described above, the external pressure type filter element and the internal pressure type filter element are structurally different because the passing directions of the working fluid are opposite, and there are the following problems and drawbacks.

In the case of the external pressure type filter element, since the working liquid must be supplied under pressure to the outer surface, a pressure vessel for arranging the external pressure type filter element is required. Also, since the sludge contained in the working fluid adheres to the outer surface of the external pressure type filter element, it is easy to clean the external pressure type filter element body, and there is the advantage that it can be reused. Cleaning of the inside of the pressure vessel was necessary. Therefore, there is a problem that the time for which the electric discharge machine is stopped is extended.

On the other hand, in the case of the internal pressure type filter element, since the working fluid must be supplied under pressure to the inner cylindrical space portion, a supply pipe which also serves as a mounting member is inserted into the inner cylindrical space portion and the internal pressure type filter element is inserted. The element is pressed and clamped in the axial direction. Since pressure does not work in the container that covers the internal pressure type filter element, it does not require pressure resistance as much as the pressure container for the external pressure type filter element described above, and there is an advantage that a simple cover is enough, but the internal pressure type filter element is the same. The element body needed strength to withstand the pressure contact clamping force.

Further, in the case of the internal pressure type filter element, cleaning and reuse are not taken into consideration, and if it becomes dirty, it is replaced with a new one, so that it costs much. In particular, since the internal pressure type filter element has increased in cost only for the improvement in strength,
The replacement cost was higher than the external pressure type filter element.

Further, since the inner cylinder space portion of the same internal pressure type filter element penetrates, the sludge adhering to the inside of the filter element sometimes drops to the bottom portion of the above-mentioned container at the time of replacement work with a new one. For this reason, the valve installed at the bottom of the container must be opened to discharge the sludge that has fallen into the settling tank, and the valve leading to the clean tank installed above the valve must be closed. The operation was very troublesome.

As described above, in the case of the external pressure type filter element, the running cost is low, but there are problems such as an increase in cost of the pressure vessel and an increase in stop time during cleaning. Further, in the case of the internal pressure type filter element, although the storage container is inexpensive, there are problems such as an increase in running cost and a troublesome valve opening / closing operation during replacement work.
Furthermore, a big problem common to both is that when the used filter element is pulled out from the storage container, the black turbid working fluid drips and contaminates the work floor and the outer periphery of the working fluid supply device. there were.

[0008]

[Problems to be solved by the invention] The problem to be solved by the present invention is that the replacement work can be carried out easily and in a short time, and there is no outflow of polluted working fluid, sludge, etc. during the replacement work, and a simple structure. Therefore, it is an object of the present invention to provide a filter element for purifying an electric discharge machining liquid, which has a low manufacturing cost and a low cost for a storage container.

[0009]

Means for Solving the Problems The gist of the present invention which has solved the above problems is to provide a space between an outer cylinder and an inner cylinder which is sandwiched between an upper end plate and a lower end plate and through which a fluid can pass. A filter element that encloses a filter paper and filters the electric discharge machining liquid supplied to the inner cylinder space from the inner surface to the outer surface of the same filter paper to form a closed shape that does not allow fluid to pass through the lower end plate and the upper end. The plate is provided with a liquid supply port whose peripheral portion is bent downward, and a flange-shaped member having a plurality of notches in the inner peripheral portion or the outer peripheral portion is attached above the liquid supply port. It is in the filter element for purifying the electric discharge machining fluid.

[0010]

The function of the filter element for purifying the electric discharge machining fluid of the present invention is to filter the machining fluid pressurized and supplied to the inner cylinder space from the inner surface of the filter paper to the outer surface thereof. Belong to. Therefore, the storage container does not have to be particularly pressure resistant.

In the electric discharge machining fluid cleaning filter element of the present invention, the lower end plate has a closed shape that does not allow passage of a fluid such as machining fluid. That is, since the inner cylinder space does not penetrate in the axial direction, the working fluid and the like remaining in the inner cylinder space does not leak out unless it passes through the filter paper. For this reason, even if the filter element for purifying the same electric discharge machining fluid that has accumulated sludge, etc., is taken out from the storage container after some use, the sludge and polluted machining fluid etc. remaining in the inner cylinder space will leak into the storage container. And do not drip on the floor of the surrounding workplace. Therefore, a troublesome valve opening / closing operation and a troublesome cleaning work are unnecessary.

In the electric discharge machining fluid purifying filter element of the present invention, the upper end plate is provided with the liquid supply port for supplying the machining fluid to the inner cylindrical space. Since the peripheral portion of the liquid supply port is bent downward, it adheres well to the outer peripheral part of the machining liquid supply pipe inserted into the liquid supply port,
Even if the hydraulic pressure in the inner cylindrical space rises, it is possible to prevent the working fluid from leaking.

The flange-shaped member mounted above the liquid supply port is for attaching and detaching the connecting fitting of the processing liquid supply pipe. A pressure contact pawl and a pressure contact ring that can pass through a notch provided on the inner peripheral portion or the outer peripheral portion of the flange-shaped member are provided on the same fitting, and the same pressure contact pawl and the same pressure contact that are rotated slightly after passing through the notch. By sandwiching and tightening the same flange-shaped member between the ring and the ring, the same machining fluid supply pipe is fixed to the same electric discharge machining fluid purification filter element through the same joint fitting. The notch of the flange-shaped member may be provided in either the inner peripheral portion or the outer peripheral portion, and the number of the notch is not particularly limited.

Since the filter element for purifying the electric discharge machining fluid of the present invention does not require an axial pressure contact clamp when it is housed in a container, it does not require high strength to withstand the pressure contact clamp force. Therefore, it is possible to reduce the manufacturing cost and the like required for forming the high strength structure. In addition, since it is not necessary for the storage container to have a pressure resistant structure, the cost can be effectively reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing the first embodiment, FIG. 2 is a partially cutaway vertical sectional view showing the first embodiment, and FIG. 3 is a plan view showing the second embodiment.
4 is a partially cutaway vertical sectional view showing the second embodiment, FIG. 5 is a plan view showing the third embodiment, FIG. 6 is a plan view showing the fourth embodiment, and FIG. 7 is a partially cutaway vertical sectional view showing the third embodiment. FIG. 8 is a plan view showing the third embodiment, FIG. 9 is a partially cutaway vertical sectional view showing the fourth embodiment, FIG. 10 is a plan view showing the fourth embodiment, and FIG. 11 is a partial cutaway showing the third embodiment. FIG.

The filter element 1 of the first embodiment is sandwiched between an upper end plate 2 and a lower end plate 3 and has a pleated shape in a space formed by an outer cylinder 4 and an inner cylinder 5 through which a fluid can pass. The filter paper 6 which is bent into a tubular shape is enclosed, and the working liquid supplied into the inner cylinder space 7 is passed from the inner surface to the outer surface of the filter paper 6 to be filtered. The outer cylinder 4 and the inner cylinder 5 are made of punching metal or the like that allows a machining liquid to easily pass therethrough. The lower end plate 3 has a closed shape that does not allow the working fluid to pass through. The upper end plate 2 is provided with a liquid supply port 9 having a shape in which the peripheral edge portion 8 is bent downward, and a flange-shaped member 11 having two notches 10 on the inner peripheral portion is provided above the liquid supply port 9. It is installed.

In the filter element 1 of Example 1,
The lower end plate 3 has a closed shape that does not allow a fluid such as a working fluid to pass therethrough. That is, since the inner cylinder space 7 does not penetrate in the axial direction, the machining liquid etc. remaining in the inner cylinder space 7 is
It does not leak outside unless it passes through the filter paper 6. Therefore, even if the filter element 1 in which sludge or the like has accumulated is taken out from the storage container after being used to some extent, the sludge or the polluted processing liquid remaining in the inner cylindrical space 7 leaks into the storage container, or the surrounding No dripping on the floor of the workplace. Therefore, the troublesome valve opening / closing operation and the troublesome cleaning work are unnecessary, and the replacement work of the filter element 1 can be carried out easily and in a short time.

Since the peripheral portion 8 of the liquid supply port 9 of the filter element 1 of the first embodiment has a shape bent downward and has elasticity, the outer periphery of the working liquid supply pipe inserted into the liquid supply port 9 will be described. Even if the liquid pressure in the inner cylindrical space 7 rises, it is possible to prevent the working fluid from leaking out even if the working fluid is in close contact.

The filter element 12 of Example 2 is
The structure of the main body is the same as that of the filter element 1, but two notches 1 are provided on the outer peripheral portion of the flange-shaped member 13.
4 is provided. The filter element 15 of the third embodiment and the filter element 16 of the fourth embodiment have the same main body structure as the filter element 1, but the shapes of the flange members 17 and 18 are different. Three notches 1 are provided on the inner peripheral portion of the flange-shaped member 17.
9 are provided, and four notches 20 are provided on the outer peripheral portion of the flange-shaped member 18.

7 and 8 show a state in which the connecting fitting 21 of the working liquid supply pipe 24 is attached to the filter element 15. The flange-shaped member 17 is clamped and clamped between the pressure-contact claw 22 and the pressure-contact ring 23, which are slightly rotated by passing through the notch 19 in the inner peripheral portion of the flange-shaped member 17, so that the machining liquid is passed through the connecting metal fitting 21. The supply pipe 24 is detachably connected to the filter element 15.

9 and 10 show the filter element 16
The state where the connecting fitting 25 of the working liquid supply pipe 24 is attached is shown in FIG. Notch 20 in the outer peripheral portion of the flange-shaped member 18
The flange-shaped member 18 is clamped and clamped between the pressure-contacting claw 26 and the pressure-contacting ring 27, which have been slightly rotated by passing through, so that the machining liquid supply pipe 24 can be detachably attached to the filter element 16 via the connecting fitting 25. It is designed to be connected.

FIG. 11 shows a state in which the processing liquid supply pipe 24 is connected to the filter element 15 via the connecting member 21 and is housed in the housing container 28. When the filter element 15 is housed, a pressure contact clamp in the axial direction is unnecessary, so that it is not necessary to have a high-strength structure capable of withstanding the pressure contact clamp force unlike the conventional filter element, and the manufacturing cost can be reduced. Also storage container 28
Also, since it is not necessary to use a pressure resistant structure, it is effective for cost reduction. These merits can be similarly obtained when the above-mentioned filter elements 1, 12, 16 are used. Although all of the filter elements 1, 2, 15 and 16 of Examples 1 to 4 are used for purifying the electric discharge machining liquid, they can be used in other fields as long as they are processes for purifying the same liquid. It is also possible to do so.

[0023]

[Effect of the Invention] According to the present invention, the replacement work can be performed easily and in a short time, there is no outflow of polluted working fluid, sludge, etc. during the replacement work, the manufacturing cost is low with a simple structure, and it is required for a storage container It is possible to provide a filter element for purifying an electric discharge machining liquid that is low in cost.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment.

FIG. 2 is a partially cutaway vertical sectional view showing the first embodiment.

FIG. 3 is a plan view showing a second embodiment.

FIG. 4 is a partially cutaway vertical sectional view showing a second embodiment.

FIG. 5 is a plan view showing a third embodiment.

FIG. 6 is a plan view showing a fourth embodiment.

FIG. 7 is a partially cutaway vertical sectional view showing a third embodiment.

FIG. 8 is a plan view showing a third embodiment.

FIG. 9 is a partially cutaway vertical sectional view showing a fourth embodiment.

FIG. 10 is a plan view showing a fourth embodiment.

FIG. 11 is a partially cutaway vertical sectional view showing a third embodiment.

[Explanation of symbols]

 1 Filter Element 2 Upper End Plate 3 Lower End Plate 4 Outer Cylinder 5 Inner Cylinder 6 Filter Paper 7 Inner Cylinder Space 8 Peripheral Edge 9 Liquid Supply Port 10 Notch 11 Flange Member 12 Filter Element 13 Flange Member 14 Notch 15 Filter Element 16 Filter Element 17 Flange-shaped member 18 Flange-shaped member 19 Notch 20 Notch 21 Connecting fitting 22 Pressure contact claw 23 Pressure contact ring 24 Machining fluid supply pipe 25 Connection fitting 26 Pressure contact claw 27 Pressure contact ring 28 Storage container

Claims (1)

[Scope of utility model registration request] 1. A discharge, which is sandwiched between an upper end plate and a lower end plate, has a filter paper enclosed in a space formed by an outer cylinder and an inner cylinder through which a fluid can pass, and is supplied into the inner cylinder space. In a filter element that filters the working fluid from the inner surface to the outer surface of the same filter paper, the lower end plate has a closed shape that does not allow the fluid to pass through, and the upper end plate has a peripheral edge bent downward. A filter element for purifying an electric discharge machining fluid, characterized in that a flange-shaped member provided with a mouth and further provided with a plurality of notches in an inner peripheral portion or an outer peripheral portion is attached to a position above the liquid supply port.