JP2001137622A - Filter element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter element which is lightened by filtering a polluted liquid filling the inside and discharging the liquid to the outside and capable of reducing the load of an operator. SOLUTION: This filter element is formed by interposing a filter member 3 between a top plate 1 and a bottom plate 2. In this case, an auxiliary filter member 8 is disposed on the bottom plate 2, a stop valve member 9 is furnished in the auxiliary filter member 8, and the upper opening of the member 8 is closed by raising the stop valve member 9. Meanwhile, a liquid discharge port 5 is closed by lowering the stop valve member. Further, since a spring member 10 for pressing the stop valve member 9 upward is disposed on the rim of the discharge port 5, the liquid is hardly left in the element when the element is replaced, hence the element is lightened, and the load of an operator to replace the element is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a filter element for purifying various contaminants.

[0001]

2. Description of the Related Art Conventionally, for example, when electric discharge machining is performed on a metal material, generally, clear water or clear oil is used as a working fluid. During the processing, the processing liquid is supplied after being circulated and filtered, and the contaminated liquid including the processing chip is introduced into the contaminated liquid tank from the drain port, and the contaminated liquid is pumped up by the pump, and is sent to the filter element under pressure and filtered. The cleaning liquid is constantly circulated and supplied while storing the filtered cleaning liquid in the cleaning liquid tank.

[0002] As the above filter element, FIG.
The filter element A1 as shown in FIG. 4 is used. This filter element A1 is used for a certain period, and when the filter member A11 becomes clogged, it is replaced with another new filter element A1.

However, the above filter element
When replacing A1, the filter element A1 is full of contaminated liquid, and the filter element A1 has a considerable weight, imposing a heavy burden on an operator, and at the same time, contaminants in the filter element A1. The liquid is turned upside down by turning the filter element A1 upside down.
2 had to be discharged, and that work was also a heavy burden on workers.

[0004]

SUMMARY OF THE INVENTION The present invention provides a smooth and reliable filtration of a contaminated liquid without the need for a separate operation for discharging the contaminated liquid therein. Provided is a filter element that can be discharged to the outside while reducing the weight and reducing the burden on an operator.

[0005]

According to the first aspect of the present invention, a filter element is provided between a top plate and a bottom plate, and a hollow chamber is formed in the center of the filter member. In a filter element configured to press-in the contaminated liquid into the room, filter the contaminated liquid through the filter member, and discharge the contaminated liquid to the outside, a cylindrical sub-filter member is disposed on the bottom plate, and An on-off valve member that moves up and down along the sub-filter member is disposed in the sub-filter member, and the upward movement of the on-off valve member closes an upper end opening of the sub-filter member that communicates with the hollow chamber. The drain member provided at the bottom is closed by the downward movement, and further, when the on-off valve member closes the drain port, a spring member for elastically pressing the on-off valve member upward is drained. Characterized in that it is arranged on the rim of the mouth.

[0006] The filter element according to the second aspect is the filter element according to the first aspect,
A rubber annular valve seat is attached to the drain port, and a base end of a spring member made of a leaf spring is fixed to an edge of the drain port. The central portion of the lower surface of the on-off valve member that is in close contact with the annular valve seat is configured to be elastically pressed upward.

[0007]

In order to use the filter element of the present invention, first, the filter element of the present invention is put into a cleaning liquid tank, immersed in the cleaning liquid tank, and placed in the cleaning liquid tank. Then, the contaminated liquid is pressed into the hollow chamber of the filter element.

[0008] Then, the on-off valve member moves down due to the pressure of the contaminated liquid, closes the drain port formed at the bottom of the main body, and prevents leakage of the contaminated liquid from the drain port. Then, the contaminated liquid pressed into the hollow chamber of the filter element is filtered out by the filter member and discharged out of the filter element.

If the filter element is used for a certain period of time and the filter member of the filter element becomes clogged, it is necessary to replace the filter element. Will be described.

First, the injection of the contaminated liquid into the hollow chamber of the filter element is stopped. Then, with the release of the pressurization of the contaminated liquid, the opening / closing valve member that was pressed downward by the supply pressure of the contaminated liquid and closed the drain port was disposed at the edge of the drain port. The elastic member is resiliently pressed upward by the spring member and quickly separates from the drain port and floats up, smoothly and reliably opens the drain port, and closes an upper end opening of the cylindrical sub-filter member.

When the drain valve is closed for a long time by lowering the on-off valve member by the pressure input of the contaminated liquid, even if the on-off valve member releases the pressure input of the contaminated liquid. Regardless, the closed state of the drain port may be maintained by maintaining the close contact state attached to the edge of the drain port,
In the present invention, a spring member is disposed at the edge of the drain port to release the pressure input of the contaminated liquid, and at the same time, the open / close valve member is pushed upward by the spring member, and the open / close valve member is moved. The drainage port can be forcibly and surely detached from the edge of the drainage port to open the drainage port, so that the replacement operation of the filter element can be performed smoothly.

Thereafter, the filter element is pulled up from the cleaning liquid tank. Then, the drain port of the bottom plate of the filter element is opened by the upward displacement of the on-off valve member, and the upper end opening of the sub-filter member is closed by the on-off valve member. The contaminated liquid remaining in the filter element is filtered by passing through the sub-filter member, and then discharged out of the filter element through the drain port.

Therefore, when the filter element is taken out of the cleaning liquid tank, the contaminated liquid in the filter element is discharged to the outside through the drain port while being filtered by the sub-filter member. The weight of the filter element is considerably reduced by the liquid, and it is not necessary to separately perform an operation of inverting the filter element upside down and discharging the contaminated liquid as in the related art.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of a filter element of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the filter element A has a top plate 1 having a planar square shape arranged at a certain interval in the vertical direction, and a top plate 1 having the same size and the same shape as the top plate 1. The filter member 3 is interposed between the surface facing the bottom plate 2.

As shown in FIG. 3, the filter member 3 is formed in a pleated shape and is interposed between the facing surfaces of the top plate 1 and the bottom plate 2 as described above. Specifically, a long strip-shaped filter member having a vertical width matching the gap between the facing surfaces of the top plate 1 and the bottom plate 2
Two filter members 31 and 32 are prepared, and these filter members 31 and 32 are pleated at predetermined lengths.
Pleated lines 3a, 3a are arranged on both sides between the surfaces facing the bottom plate 2 with the pleat lines 3a in the vertical direction. In addition, a space is formed between the opposed end surfaces of the two filter members 31 and 32.

Further, pleats are formed in the front and rear portions in the space between the opposing end surfaces of the filter members 31 and 32 disposed on both sides between the opposing surfaces of the top plate 1 and the bottom plate 2 in the same manner as described above. Filter members 33 and 34 that are bent are provided. A space is also formed between the opposed end surfaces of the filter members 33, 34. Therefore, in the center between the top plate 1 and the bottom plate 2, the filter members 31, 32, 33,
The hollow chamber 4 is formed of a space surrounded by the 34 opposing surfaces. Each of the two side ends of the filter members 33 and 34 disposed on the front and rear portions of the space is connected to each of the front and rear ends of the filter members 31 and 32 disposed on both sides of the space. The hollow chamber 4 is surrounded by the filter member 3.

As shown in FIGS. 4 and 5, a press-in port 11 penetrating between the upper and lower surfaces of the top plate 1 is provided at the center of the top plate 1. The pressure inlet 11 is integrally provided with a coupler 12 for detachably connecting a hose B for sending a contaminated liquid from the outside, while communicating with the upper end of the hollow chamber 4.

The filter member 3 is formed from a conventionally used filter medium, and includes, for example, a nonwoven fabric cloth such as a spunbonded nonwoven fabric, a meltblown nonwoven fabric, a wet nonwoven fabric, and a needle-punched nonwoven fabric, and a woven filter fabric. Is used.

In the center of the bottom plate 2 at the lower end of the hollow chamber 4, a flat circular drain port 5 penetrating between the upper and lower surfaces thereof is formed to communicate with the hollow chamber 4. An annular valve seat 6 made of rubber and having a diameter slightly larger than that of the drain port 5 is fixed to the upper surface of the edge of the drain port 5.

The annular valve seat 6 is not necessarily provided at the drain port 5, but if the annular valve seat 6 is provided, the upper end surface of the annular valve seat 6 will be described later. It is possible to prevent the lower surface of the floating on-off valve member 9 from being damaged by abrasion or the like due to collision with the edge of the drainage port 5 provided on the bottom plate 2 and to prevent the annular valve seat 6 from being damaged.
The floating opening / closing valve member 9 is preferably brought into close contact with the upper end surface of the floating opening / closing member in a water-tight manner, so that the drain port 5 can be completely and reliably closed.

Further, a cylindrical inner protection member 71 having a fixed height is disposed in the lower end of the hollow chamber 4. That is, the inner protective member 71 is fixed on the bottom plate 2 around the annular valve seat 6 and has a height corresponding to the height of the inner protective member 71 over the entire outer peripheral surface thereof. And a cylindrical sub-filter member 8 formed of a filter medium having a higher liquid permeability than the filter member 3 and capable of natural filtration. Further, the outer peripheral surface of the sub-filter member 8 is provided over the entire periphery thereof.
An outer protective member 72 having a height corresponding to the height of the outer filter member is fitted, and the sub-filter member 8 is interposed between the opposing peripheral surfaces of the inner and outer protective members 71 and 72 in a protected state. It is arranged.

Further, each of the peripheral surfaces of the inner and outer protection members 71 and 72 has a large number of small-diameter liquid passage holes penetrating the inner and outer surfaces thereof.
The outer protective member 72 and the inner protective member 71 have an outer peripheral surface 71a and an inner protective surface 71 through which the small-diameter liquid holes 71a and 72a and the sub-filter member 8 pass. In addition, the small-diameter through-hole 71 a of the inner protective member 71 is inserted into the lower end of the hollow chamber 4, and the outer protective member 72 is
The small-diameter liquid passage holes 72a face the inner surface of the filter member 3, respectively. The outer protective member 72 may be provided as needed.

A disk-like floating on-off valve member 9 having a diameter matching the inner diameter of the inner protective member 71 and having a certain thickness is disposed inside the inner protective member 71. The member 9 is configured to be vertically displaceable while sliding its outer peripheral surface against the inner peripheral surface of the inner protective member 71 in a watertight manner. The floating on-off valve member 9 is not particularly limited as long as it has a levitation force in the liquid. For example, a wooden disk, a synthetic resin disk, a hollow disk, a sponge disk, rubber Disc-shaped bodies and the like can be mentioned.

If the outer surface of the floating on-off valve member 9 is formed of an elastic material, the outer surface of the floating on-off valve member 9 is formed on the inner peripheral surface of the inner protective member 71 and the upper end surface of the annular valve seat 6. As described later, the floating opening / closing valve member 6 can more reliably close the upper end opening of the inner protection member 71 (sub-filter member 8) and the drain port 5 as described later. Can be.

During the filtration of the contaminated liquid, the floating on-off valve member 9 is displaced downward in the inner protective member 71 by the pressure input of the contaminated liquid into the hollow chamber 4, and its lower surface is Abuts on the upper end surface of the annular valve seat 6 in a watertight state and is received, and the drain port 5 is closed in a watertight state by the floating on-off valve member 9.

On the other hand, when the floating on-off valve member 9 releases the pressurization of the contaminated liquid into the hollow chamber 4, the floating on-off valve member 9 floats and displaces upward in the inner protective member 71 by its own floating force. At the upper end edge of the inner protective member 71, a floating regulating member 73 made of a linear material is provided so as to extend across the upper end opening of the inner protective member 71.
The upper surface of the inner protection member 71 (sub-filter member 8) has its upper surface abutted against and received by the floating regulating member 73 so that further floating is restricted. 9 closed.

Further, as shown in FIGS. 4 to 6, a spring member 10 composed of a leaf spring is integrally provided at the edge of the drain port 5. That is, the spring member 10 is formed by slightly bending a flat, narrow and narrow rectangular plate spring obliquely upward from its base end toward the center of the drain port 5. The drainage port 5 is fixed to the edge of the drainage port 5 on the bottom plate 2, and the free distal end is located above the central part of the drainage port 5.

Then, the floating on-off valve member 9 is moved downward by the pressure input of the contaminated liquid, and the lower surface thereof is placed on the annular valve seat 6.
In a state where the spring member 10 is in contact with and received by the upper end surface of the annular valve seat 6, the distal end portion thereof is pressed downward by the lower surface of the annular valve seat 6 and elastically deformed downward. When the pressurization of the contaminated liquid into the hollow chamber 4 is released, the spring member 10 pushes upward the central portion of the lower surface of the floating on-off valve member 9 by its restoring force, thereby causing the floating on-off valve member 9 to move upward. Is smoothly and reliably detached from the annular valve member 6 so that the drain port 5 is reliably opened.

Next, how to use the filter element A will be described. First, as shown in FIG. 7, after connecting the hose B to the coupler 12 of the top plate 1, the filter element A is put into the cleaning liquid tank C, immersed, and set in the cleaning liquid tank C. . Thereafter, the contaminated liquid is pumped into the hollow chamber 4 of the filter element A through the hose B.

Then, as shown in FIG. 5 and FIG. 6, the hollow chamber 4 is filled with the contaminated liquid, and the pressure of the contaminated liquid causes the floating on-off valve member 9 to move down inside the inner protective member 71. Then, the lower surface of the floating on-off valve member 9 comes into contact with the upper end surface of the annular valve seat 6 against the elastic force of the spring member 10 and is received, and the drain port 5 is closed.
Is closed by the floating on-off valve member 9.

Therefore, the contaminated liquid press-fitted into the hollow chamber 4 of the filter element A is filtered by the filter member 3 disposed around the hollow chamber 4 and then filtered out of the filter element A, ie, cleansed. The liquid is discharged into the liquid tank C.

At this time, when the floating on-off valve member 9 moves down inside the inner protection member 71, the inside protection member 71 is also filled with the contaminated liquid, and the contaminated liquid is filled with the contaminated liquid.
The sub-filter member 8 is discharged from the hollow chamber 4 through the small-diameter liquid passage hole 71a of the sub-filter member 8 and the small-diameter liquid passage hole 72a of the outer protective member 72. The sub-filter member 8 has better water permeability than the filter member 3. That is, since the eyes are coarse, under the high pressure of the contaminated liquid as described above, the sub-filter member 8 can hardly capture the impurities contained in the contaminated liquid, and The liquid passes through the sub-filter member 8 together with the liquid, and the impurities in the contaminated liquid only slightly adhere to the inner peripheral surface of the sub-filter member 8.

When the filter element 3 is used for a certain period of time and the filter member 3 becomes clogged, it is necessary to replace the filter element A. The procedure will be described below. I do.

First, when the supply of the contaminated liquid into the hollow chamber 4 of the filter element A is stopped, the pressure of the contaminated liquid that has been acting on the upper surface of the floating on-off valve member 9 is released. The floating on-off valve member 9 is pushed upward by the restoring force of the spring member 10 elastically contacting the lower surface center of the floating on-off valve member 9, and smoothly and reliably from the upper end surface of the annular valve seat 6. You will be withdrawn. in this way,
Since the floating on / off valve member 9 is forcibly detached from the annular valve seat 6 by the restoring force of the spring member 10, the floating on / off valve member 9 is in close contact with the upper end surface of the annular valve seat 10. Unexpected situations such as maintaining the closed state of the drainage port 5 by maintaining the above condition do not occur. In addition, the disk-shaped floating on-off valve member 9 is pushed upward by the spring member 10 at the center of the lower surface thereof, so that the disk-shaped floating on-off valve member 9 is reliably separated upward from the annular valve seat 6.

Then, the floating on-off valve member 9 detached from the annular valve seat 6 is connected to the floating on-off valve member 9 through the drain port 5.
Floating due to the hydraulic pressure acting on, displaces the inside of the inner protective member 71 upward, further upward movement is regulated by a levitation regulating member 73 erected at the upper end opening of the inner protective member 71, The inner protective member 71 (sub-filter member 8)
Is closed by the floating opening / closing valve member 9. At the same time, as shown in FIG. 4, a large number of small-diameter liquid holes 71a provided in the inner protective member 71 communicate with the drain port 5 through the inner protective member 71.

Next, the filter element A is gradually lifted upward from the cleaning liquid tank C while maintaining this state, and the hollow chamber 4 of the filter element A is filled during the lifting. The contaminated liquid flows from the gap 4a between the inner surface of the filter member 3 and the outer peripheral surface of the outer protective member 72 into the sub-filter member 8 through the liquid passage hole 72a of the outer protective member 72, and the sub-filter member 8 After being filtered, the liquid enters the inner protective member 71 through the liquid passage hole 71a of the inner protective member 71, and is discharged into the cleaning liquid from the drain port 5.

At this time, since the sub-filter member 8 is formed of a coarse filter medium having excellent water permeability as described above, unlike the filter member 3, the sub-filter member 8 removes the contaminated liquid without applying pressure. Natural filtration can be performed smoothly and reliably.

As described above, during the filtration of the contaminated liquid by the filter member 3, the contaminated liquid comes into contact with and passes through the inner peripheral surface of the sub-filter member 8, and the sub-filter member 8
The impurities in the contaminated liquid slightly adhere to the inner peripheral surface of
The amount of the adhering is very small. Further, since the filtration of the sub-filter member 8 is performed by natural filtration instead of the forced filtration by pressure, the sub-filter member 8 among the impurities adhering to the inner peripheral surface of the sub-filter member 8 is removed. The amount of detachment from the member 8 is very small, and does not affect the cleaning liquid tank C even if it is discharged to the cleaning liquid tank C.

Accordingly, when the filter element A is completely lifted from the cleaning liquid tank C, the contaminated liquid in the filter element A is filtered by the sub-filter member 8 and then almost completely outside the filter element A. The filter element A has been discharged, and the total weight of the filter element A has been considerably reduced. Therefore, the burden on the operator replacing the filter element A can be reduced, and the filter element A can be turned upside down as in the prior art. There is no need to separately perform the operation of discharging the contaminated liquid from the pressure inlet 12, and in this regard, the burden on the operator who replaces the filter element A can be reduced.

In the above description, the spring member 10 is made of a leaf spring. However, as shown in FIGS. 8 and 9, it may be made of a coil spring. The annular valve seat 6 is formed to be slightly larger than the diameter of the drain port 5, and a coil spring 101 is integrally provided on the bottom plate 2 inside the annular valve seat 6.

As shown in FIG. 8, the upper end of the coil spring 101 normally projects upward from the upper end surface of the annular valve seat 6, as shown in FIG. When the contaminant 9 is moved downward by the pressure input of the contaminated liquid, the coil spring 101 moves the floating on-off valve member 9.
As a result, the floating opening / closing valve member 9 is pressed downward and contracts in the vertical direction so that the upper end portion is resiliently pressed against the lower surface of the floating opening / closing valve member 9. When the press-fitting of the contaminated liquid is stopped, the coil spring 101 is actuated by the restoring force of the floating on-off valve member 9 so that the contact can be smoothly and securely contacted and received in a watertight manner. The lower surface is pushed upward so that the floating on-off valve member 9 is smoothly and reliably detached from the annular valve seat 10.

Although the disc-shaped floating on-off valve member 9 has been described, the present invention is not limited to this shape. For example, as shown in FIGS. Spherical floating on-off valve member 9 that matches the inside diameter of 71
In such a case, the outer peripheral surface of the floating on-off valve member 9 and the inner peripheral surface of the inner protective member 71 can be slidably contacted in a water-tight manner, and the floating on-off valve member 9
It is necessary that the lower peripheral surface and the upper end surface of the annular valve seat 6 be configured to be in contact with and received in a watertight manner.

Lastly, in the filter element A, the top plate 1 and the bottom plate 2 are formed in a plane square shape.
The case where the filter member 3 is arranged in a square tubular shape between the opposing surfaces of the base plate 2 and the bottom plate 2 has been described. As shown in FIGS. 12 and 13, the top plate 1 and the bottom plate 2 are The filter member 3 is formed in a circular shape, and between the opposing surfaces of the top plate 1 and the bottom plate 2, a horizontally long rectangular filter member 3 is formed in a pleated shape and both ends are connected to each other to form a cylindrical shape. The filter element A may be interposed.

[0044]

According to the filter element of the present invention, a filter member is interposed between the top plate and the bottom plate, and a hollow chamber is formed in the center of the filter member. Is press-fitted, the contaminated liquid is filtered by a filter member, and then discharged to the outside. In the filter element, a cylindrical sub-filter member is disposed on the bottom plate, and An on-off valve member that moves up and down along the sub-filter member is disposed, and the upward movement of the on-off valve member closes the upper end opening of the sub-filter member that communicates with the hollow chamber, while the downward movement causes A drain port provided at the bottom is closed, and a spring member for pressing the open / close valve member upward when the open / close valve member closes the drain port is arranged on the rim of the drain port. Since the filter element is disposed in the cleaning liquid tank and during filtration of the contaminated liquid, the on-off valve member closes the drain port and the contaminated liquid is filtered under high pressure. While the filter element can be filtered and discharged to the outside, the filter element is pulled up from the cleaning liquid tank, and when replacing this filter element, the sub-filter is opened by the open / close valve member during pulling up from the cleaning liquid tank. Close the upper end opening of the member and open the drain port,
After the contaminated liquid is filtered by the sub-filter member, the contaminated liquid can be discharged into the cleaning liquid through the drain port. Therefore, almost no residual liquid is generated in the filter element, so that the weight of the filter element is reduced. Therefore, it is possible to reduce the burden on the operator who replaces the filter element, and as in the related art,
There is no need to separately perform an operation of inverting the contaminated liquid remaining in the filter element, thereby simplifying the exchange operation and improving the efficiency.

Further, the on-off valve member is displaced downward by the pressure input of the contaminated liquid, and is elastically urged upward by the spring member in a state where the drain port is closed. Even after the pressure input is released, there is no unexpected situation in which the on-off valve member is attached to the edge of the drain port to maintain the close contact state and the drain port to remain closed.

That is, at the same time that the downward pressure input by the contaminated liquid is released, the on-off valve member is forcibly pushed upward by the spring member and quickly and reliably detaches from the drain port. To open the drain port.

The filter element according to the second aspect is the filter element according to the first aspect,
A rubber annular valve seat is attached to the drain port, and a base end of a spring member made of a leaf spring is fixed to an edge of the drain port. Since the central portion of the lower surface of the on-off valve member which is in close contact with the annular valve seat is configured to be elastically pressed upward, the on-off valve member is released despite the release of the pressure input of the contaminated liquid. Is pressed into the contaminated liquid without causing a situation in which the upper end surface of the annular valve seat is in intimate contact with the upper end surface of the annular valve seat and unexpectedly maintains the state where the on-off valve member closes the drain port. Simultaneously, the on-off valve member is pushed upward by the spring member to quickly and surely detach from the annular valve seat to open the drainage port and open the upper end of the sub-filter. Close the Can be performed replacing the Luther element smoothly and easily.

Further, since the opening / closing valve member closing the drain port is pressed upward by the spring member at the center of the lower surface thereof, the supply of the contaminated liquid is stopped when the supply of the contaminated liquid is stopped. The on-off valve member can be disengaged from the annular valve seat while maintaining a parallel state without being tilted by being evenly pushed upward by the spring member, and the on-off valve member can be smoothly moved by the spring member. After detaching from the annular valve seat, it keeps its horizontal position without tilting, moves up quickly by its own levitation force to open the drain port, and quickly and reliably opens the upper opening of the sub-filter. Can be closed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a filter element of the present invention.

FIG. 2 is a perspective view showing the filter element of FIG. 1;

FIG. 3 is a horizontal sectional view of the filter element of FIG. 1;

FIG. 4 is a longitudinal sectional view of the filter element of FIG. 1 showing a state in which an upper end opening of a sub-filter is closed by a floating on-off valve member.

FIG. 5 is a longitudinal sectional view of the filter element of FIG. 1 showing a state in which a drainage port is closed by a floating on-off valve member.

FIG. 6 is an enlarged vertical cross-sectional view showing a state in which a drainage port is closed by a floating on-off valve member.

FIG. 7 is a front view showing a use state of the filter element of FIG. 1;

FIG. 8 is an enlarged vertical sectional view showing another drain port portion of the filter element.

FIG. 9 is an enlarged vertical cross-sectional view showing a state in which a drainage port is closed by a floating on-off valve member.

FIG. 10 is a longitudinal sectional view of another filter element showing a state in which the upper opening of the sub-filter is closed by a floating on-off valve member.

FIG. 11 is a vertical cross-sectional view of the filter element showing a state in which a drainage port is closed by a floating on-off valve member.

FIG. 12 is a partially cutaway perspective view showing another filter element of the present invention.

FIG. 13 is a horizontal sectional view showing the filter element of FIG.

FIG. 14 is a longitudinal sectional view showing a conventional filter element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top plate 11 Pressure inlet 2 Bottom plate 3 Filter member 4 Hollow chamber 5 Drainage port 6 Annular valve seat 71 Inner protection member 71a Liquid passage hole 72 Outside protection member 72a Liquid passage hole 73 Floating control member 8 Sub-filter member 9 Floating open / close Valve member 10 Spring member A Filter element B Hose C Cleaning liquid tank

Claims (2)

[Claims] 1. A filter member is interposed between a top plate and a bottom plate, and a hollow chamber is formed in a central portion of the filter member. A contaminated liquid is pressed into the hollow chamber, and the contaminated liquid is filtered. In the filter element configured to be filtered and discharged to the outside, a cylindrical sub-filter member is disposed on the bottom plate, and the sub-filter member is vertically moved along the sub-filter member in the sub-filter member. An opening / closing valve member is disposed, and the upward movement of the opening / closing valve member closes the upper end opening of the sub-filter member communicating with the hollow chamber, and the downward movement closes the drain port provided at the bottom. And a spring member for resiliently pressing the on-off valve member upward when the on-off valve member closes the drain port is provided at the edge of the drain port. And 2. An annular valve seat made of rubber is mounted on the drain port, and a base end of a spring member made of a leaf spring is fixed to an edge of the drain port. 2. The filter element according to claim 1, wherein a central portion of a lower surface of the on-off valve member closely contacting the annular valve seat is pressed upward by a tip of the filter element.